10-K

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

________________________________________________________

FORM 10-K

x	ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the Fiscal Year Ended December 31, 2013
or
o	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the transition period from  to

Commission file number 000-19319

____________________________________________

Vertex Pharmaceuticals Incorporated

(Exact name of registrant as specified in its charter)

Massachusetts	04-3039129
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
50 Northern Avenue, Boston, Massachusetts	02210
(Address of principal executive offices)	(Zip Code)

Registrant’s telephone number, including area code (617) 341-6100

____________________________________________

Securities registered pursuant to Section 12(b) of the Exchange Act:

Title of Each Class	Name of Each Exchange on Which Registered
Common Stock, $0.01 Par Value Per Share	The NASDAQ Global Select Market

Securities registered pursuant to Section 12(g) of the Exchange Act: None

______________________________________________

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.  Yes x No o

Indicate by check mark if the registrant is not required to file reports pursuant to Section 13 or Section 15(d) of the Exchange Act.  Yes o No x

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.  Yes x No o

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).  Yes x No o

Indicate by check mark if disclosure of delinquent filers pursuant to Item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of the registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10 K. x

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer or a smaller reporting company. See definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer x	Accelerated filer o	Non-accelerated filer o	Smaller reporting company o
	(Do not check if a smaller reporting company)

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act). Yes o No x

The aggregate market value of the registrant’s common stock held by non-affiliates of the registrant (without admitting that any person whose shares are not included in such calculation is an affiliate) based on the last reported sale price of the common stock on June 28, 2013 (the last trading day of the registrant’s second fiscal quarter of 2013) was $18.5 billion. As of February 5, 2014, the registrant had 235,771,942 shares of common stock outstanding.

DOCUMENTS INCORPORATED BY REFERENCE

Portions of the definitive Proxy Statement for the 2014 Annual Meeting of Shareholders to be held on May 7, 2014 are incorporated by reference into Part III of this Annual Report on Form 10-K.

VERTEX PHARMACEUTICALS INCORPORATED

ANNUAL REPORT ON FORM 10-K

TABLE OF CONTENTS

		Page
PART I
Item 1.	Business	1
	Directors and Executive Officers of the Registrant	26
Item 1A.	Risk Factors	30
Item 1B.	Unresolved Staff Comments	47
Item 2.	Properties	47
Item 3.	Legal Proceedings	48
Item 4.	Mine Safety Disclosures	48
PART II
Item 5.	Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases of Equity Securities	49
Item 6.	Selected Financial Data	51
Item 7.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	52
Item 7A.	Quantitative and Qualitative Disclosures About Market Risk	70
Item 8.	Financial Statements and Supplementary Data	70
Item 9.	Changes in and Disagreements with Accountants on Accounting and Financial Disclosure	70
Item 9A.	Controls and Procedures	70
Item 9B.	Other Information	72
PART III
Item 10.	Directors, Executive Officers and Corporate Governance	73
Item 11.	Executive Compensation	73
Item 12.	Security Ownership of Certain Beneficial Owners and Management and Related Stockholder Matters	73
Item 13.	Certain Relationships and Related Transactions, and Director Independence	73
Item 14.	Principal Accountant Fees and Services	73
PART IV
Item 15.	Exhibits and Financial Statement Schedules	74
	Signatures	77

“We,” “us,” “Vertex” and the “Company” as used in this Annual Report on Form 10-K refer to Vertex Pharmaceuticals Incorporated, a Massachusetts corporation, and its subsidiaries.

“Vertex,” “INCIVEK^®” and “KALYDECO™” are registered trademarks of Vertex. Other brands, names and trademarks contained in this Annual Report on Form 10-K, including “INCIVO™” and “TELAVIC™,” are the property of their respective owners.

PART I

ITEM 1. BUSINESS

OVERVIEW

We are in the business of discovering, developing, manufacturing and commercializing small molecule drugs. We invest in scientific innovation to create transformative medicines for patients with serious diseases in specialty markets. Since mid-2011, we have obtained approval for, and initiated commercial sales of, our first two products: KALYDECO (ivacaftor) and INCIVEK (telaprevir). We market KALYDECO in the United States and international markets for the treatment of patients six years of age and older with cystic fibrosis, or CF, who have a specific genetic mutation in their cystic fibrosis transmembrane conductance regulator, or CFTR, gene, which is referred to as the G551D mutation. INCIVEK is approved in the United States and Canada for the treatment of adults with genotype 1 hepatitis C virus, or HCV, infection. Our collaborators, Janssen Pharmaceutica NV, or Janssen, and Mitsubishi Tanabe Pharma Corporation, or Mitsubishi Tanabe, market telaprevir in other international markets.

Our business is focused on developing and commercializing therapies for the treatment of cystic fibrosis and advancing our other research and early-stage development programs.

Cystic Fibrosis - Our goal is twofold: to develop treatment regimens that will provide benefits to as many patients with CF as possible and to maximize those benefits.

•KALYDECO. KALYDECO was approved in 2012 in the United States and European Union as a treatment for patients with CF six years of age and older who have the G551D mutation in their CFTR gene. We have submitted a supplemental New Drug Application, or sNDA, to the U.S. Food and Drug Administration, or FDA, and a Marketing Authorization Application, or MAA, variation in the European Union seeking approval to market ivacaftor for the treatment of patients with CF six years of age and older who have specified other mutations in their CFTR gene, which were studied in our first label-expansion clinical trial for ivacaftor. We also are seeking to expand the number of patients eligible for treatment with ivacaftor by (i) evaluating ivacaftor as a potential treatment for patients with CF who have residual CFTR function, including patients with CF who have the R117H mutation in their CFTR gene, and (ii) evaluating ivacaftor as a potential treatment for patients with CF two to five years of age who have specific mutations in their CFTR genes.

•Ivacaftor in Combination with CFTR Corrector Compounds. In October 2013, we completed enrollment in an international pivotal Phase 3 development program to evaluate combinations of lumacaftor (VX-809), our most advanced investigational CFTR corrector compound, and ivacaftor. The Phase 3 development program includes two Phase 3 clinical trials, referred to as TRAFFIC and TRANSPORT, that each enrolled patients with CF 12 years of age and older with two copies (homozygous) of the F508del mutation in their CFTR gene. The F508del mutation is the most prevalent genetic mutation that causes CF. We expect data from TRAFFIC and TRANSPORT in mid-2014. If these clinical trials are successful, we plan to submit a New Drug Application, or NDA, to the FDA and an MAA in the European Union, in the second half of 2014. We also are evaluating VX-661, a second investigational CFTR corrector, in combination with ivacaftor, in Phase 2 clinical development.

•CF Research Programs. We are seeking to identify and develop next-generation CFTR corrector compounds that could be evaluated in regimens combining ivacaftor with two CFTR corrector compounds.

Research and Early-stage Development Programs - We are engaged in a number of other research and early-stage development programs, including programs in the areas of oncology, multiple sclerosis and other serious and rare diseases. Over the last year, we have evaluated in Phase 2 clinical trials: VX-135, an HCV nucleotide analogue, in combination with daclatasvir, an NS5A replication complex inhibitor being developed by Bristol-Myers Squibb, or BMS; VX-509, our JAK3 inhibitor, in patients with rheumatoid arthritis; and VX-787, a drug candidate for the treatment of influenza A. We are in discussions with Alios BioPharma, Inc., or Alios, from whom we exclusively license VX-135, and BMS regarding potential next steps for further clinical evaluation of VX-135 and are seeking collaborators to advance clinical development of VX-509 and VX-787. We plan to continue investing in our research programs and fostering scientific innovation in order to identify and develop transformative medicines. We believe that pursuing research in diverse areas allows us to balance the risks inherent in drug development and may provide drug candidates that will form our pipeline in future years.

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CYSTIC FIBROSIS

Background

Cystic fibrosis is a rare, life-threatening genetic disease affecting approximately 75,000 people in North America, Europe and Australia. CF is caused by a defective or missing CFTR protein resulting from mutations in the CFTR gene. Children must inherit two defective CFTR genes, which are referred to as alleles - one from each parent - to have CF. There are more than 1,900 known mutations in the CFTR gene, some of which result in CF, including two of the most prevalent mutations, the G551D mutation and the F508del mutation.

The G551D mutation results in a defect in the CFTR protein in which the defective CFTR protein reaches the surface of a cell but does not efficiently transport chloride ions across the cell membrane. The F508del mutation results in a defect in the CFTR protein in which the CFTR protein does not reach the surface of cells in sufficient quantities. The absence of working CFTR proteins results in poor flow of salt and water into and out of cells in a number of organs, including the lungs. As a result, thick, sticky mucus builds up and blocks the passages in many organs, leading to a variety of symptoms. In particular, mucus builds up and clogs the airways in the lungs, causing chronic lung infections and progressive lung damage. Ivacaftor, known as a CFTR potentiator, keeps the CFTR protein channels on the cell surface open longer, to increase the flow of salt and water into and out of the cell. CFTR correctors, such as lumacaftor and VX-661, are believed to help CFTR protein reach the cell surface.

We chose to develop KALYDECO (ivacaftor) and our other CF drug candidates because of their potential to improve the function of defective CFTR proteins in patients with CF, which is the underlying cause of CF. We discovered ivacaftor, lumacaftor and VX-661 in our research collaboration with the Cystic Fibrosis Foundation Therapeutics Incorporated, or CFFT. Our research group is continuing to work to identify additional corrector compounds that could be included in future dual- and/or triple-combination treatment regimens with the potential to provide additional benefits to patients with CF. We hold worldwide development and commercialization rights to ivacaftor, lumacaftor and VX-661. We pay royalties to CFFT on net sales of ivacaftor and will pay royalties to CFFT on any net sales of lumacaftor, VX-661 and any other corrector compounds discovered under the CFFT collaboration, if they are approved.

We market KALYDECO in specified approved indications in the United States and international markets. Our ivacaftor development program for additional indications has received a Breakthrough Therapy designation from the FDA. The FDA also has designated the combination regimens of lumacaftor with ivacaftor and VX-661 with ivacaftor for the treatment of patients with CF who have the F508del mutation on both alleles as Breakthrough Therapies. We are expecting data from these clinical programs in 2014.

KALYDECO (ivacaftor)

KALYDECO (ivacaftor) is an orally-administered CFTR potentiator that is approved in the United States, Australia, Canada and the European Union for the treatment of patients six years of age and older with CF who have the G551D mutation in their CFTR gene. KALYDECO has received recognition as a significant innovation in drug development. In the press release announcing KALYDECO's approval, the FDA identified KALYDECO as an excellent example of the promise of personalized medicine and a breakthrough therapy for the CF community, because other existing therapies treat only the symptoms of this genetic disease, while KALYDECO addresses the underlying cause. The Wall Street Journal named KALYDECO as the winner of its 2012 Technology Innovation award in the Medicine and Biotech category. During development, ivacaftor was granted orphan drug designation in the United States and European Union and Fast-track designation in the United States and, due to its promise, was advanced rapidly through development. In 2008, we evaluated ivacaftor in a small Phase 2a clinical trial that enrolled 39 patients with CF who had the G551D mutation on at least one allele. Based on the safety and efficacy data from this clinical trial, we moved directly into a Phase 3 clinical program, which we initiated in May 2009 and completed in mid-2011. We filed for approval to market ivacaftor in the United States in November 2011 and obtained approval from the FDA in January 2012, which was more than two months ahead of the original target date established by the FDA. We also obtained rapid approval for ivacaftor in the European Union and Canada later in 2012. We use the brand name KALYDECO only when we refer to the product that has been approved and with respect to the indications on the approved label. Otherwise, including in discussions of our CF development programs, we refer to the compound by its scientific (or generic) name ivacaftor.

KALYDECO is approved for the treatment of patients with CF six years of age and older who have at least one copy of the G551D mutation in their CFTR gene. We believe there are approximately 2,000 patients with CF six years of age and

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older in North America, Europe and Australia who have the G551D mutation in the CFTR gene. Since KALYDECO's approval in 2012, most of these patients have started treatment with KALYDECO.KALYDECO currently is available to eligible patients in the United States, England, Scotland, Northern Ireland, Wales, the Republic of Ireland, France, Germany, Austria, Denmark, Greece, Italy, the Netherlands, Norway and Sweden. In many international markets, including Australia and Canada, patients generally are not able to obtain access to drugs until the relevant agencies authorize public reimbursement for the cost of the drug. We are in discussions with regulatory agencies in Australia and Canada regarding public reimbursement of KALYDECO costs in these countries.

We submitted an sNDA to the FDA and an MAA variation in the European Union in September 2013 and October 2013, respectively, seeking approval to market ivacaftor for the treatment of patients with CF six years of age and older who have specified other mutations in their CFTR gene. These submissions incorporated clinical data from our first ivacaftor label-expansion Phase 3 clinical trial. The FDA has set a target date of March 27, 2014 to complete its review of this sNDA under the Prescription Drug User Fee Act (PDUFA). We estimate that in North America, Europe and Australia approximately 400 patients with CF six years of age and older have at least one of the mutations evaluated in this clinical trial, including approximately 150 patients in the United States.

CF Drug Development Programs

We are continuing our work in CF to develop treatment regimens that will provide benefits to as many patients with CF as possible and to maximize those benefits. We are seeking to increase the number of patients with CF who could benefit from our medicines both by evaluating ivacaftor in additional patient groups who may benefit, and by evaluating combinations of ivacaftor with our investigational corrector compounds, lumacaftor and VX-661, in patients with the most prevalent form of CF, those with two copies of the F508del mutation.

Ivacaftor

We have completed a Phase 3 clinical trial to evaluate ivacaftor in patients with the R117H mutation in their CFTR gene. We are conducting a fully-enrolled proof-of-concept Phase 2 clinical trial in which we are evaluating ivacaftor in patients with CF who have clinical evidence of residual CFTR function. We also are conducting a fully-enrolled Phase 3 clinical trial in which we are evaluating ivacaftor, in the form of minitablets or granules, as a treatment for children with CF two to five years of age with particular mutations in their CFTR gene, including the G551D mutation.

R117H Mutation

In December 2013, we reported data from a Phase 3 clinical trial that evaluated ivacaftor in patients six years of age and older with CF who have the R117H mutation on at least one allele of their CFTR gene. Patients diagnosed with CF who have the R117H mutation exhibit a range of severity and signs and symptoms of the disease.

The 24-week doubled-blinded Phase 3 clinical trial enrolled 69 patients. Patients 12 years of age and older had lung function at screening of 40 to 90 percent predicted FEV₁, and children six to eleven years of age had FEV₁ at screening of 40 to 105 percent predicted FEV₁. FEV₁ is a measure of the amount of air that an individual can exhale in one second. The primary endpoint of the clinical trial was the absolute change from baseline in FEV₁ throughout the treatment period for ivacaftor compared to placebo across all patients (intent-to-treat). The clinical trial did not meet its primary endpoint of a statistically significant absolute change from baseline in FEV₁. However, a pre-specified subgroup analysis demonstrated a clinical benefit in patients with CF 18 years of age and older who have the R117H mutation on at least one allele. We plan to meet with the FDA in early 2014 to discuss these results and the potential submission of an sNDA for patients with the R117H mutation. We estimate that in North America, Europe and Australia approximately 1,100 patients with CF six years of age and older have at least one copy of the R117H mutation in their CFTR gene. In the United States, approximately 300 patients with CF 18 years of age and older have the R117H mutation in their CFTR gene.

Results from R117H Clinical Trial

Lung Function (FEV₁) Results In the Total Clinical Trial Population. The primary endpoint of the clinical trial was the absolute change from baseline in FEV₁ throughout the treatment period for ivacaftor compared to placebo across all patients (intent-to-treat). In the clinical trial, the mean absolute improvement in percent predicted FEV₁ between those treated with ivacaftor and placebo was 2.1 percentage points (p=0.20). The result of statistical testing is often defined in terms of a "p-value," with p<0.05 generally considered to represent a statistically significant difference. The treatment difference for this endpoint was not statistically significant, thus the clinical trial did not meet its

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primary endpoint. The mean absolute percent predicted FEV₁ improvement during ivacaftor treatment (within-group) was 2.6 percentage points (p = 0.03).

Secondary Endpoints. In the clinical trial, the mean relative treatment difference in percent predicted FEV₁ was 5.0 percent (p = 0.06) through the 24-week treatment period. The mean relative percent predicted FEV₁ improvement during ivacaftor treatment (within-group) was 4.8 percent (p=0.01). Treatment with ivacaftor, regardless of age, resulted in statistically significant decreases in sweat chloride and improvement in patient-reported outcomes as measured by the respiratory domain of the Cystic Fibrosis Questionnaire Revised (CFQ-R). No significant differences in the frequency of pulmonary exacerbations or changes in body mass index were noted.

Safety and Tolerability. The safety and tolerability results observed in this clinical trial were consistent with those observed in prior Phase 3 clinical trials of ivacaftor in patients with CF who have the G551D mutation. The most commonly observed adverse events in those who received ivacaftor were infective pulmonary exacerbation, cough and headache, which occurred with similar frequency compared to those who received placebo. Serious adverse events occurred in 17 percent of patients who received placebo versus 12 percent for patients who received ivacaftor.

Subgroup Analyses. A pre-specified subgroup analysis was conducted to evaluate the effect of ivacaftor on patients 18 years of age and older, in patients 12 to 17 years of age and in patients six to eleven years of age. Data from these subgroup analyses are provided below:

• Patients 18 years of age and older: 50 patients 18 years of age and older were enrolled in this clinical trial and had a mean baseline percent predicted FEV₁ of 65 percent. A pre-specified subset analysis in these patients showed statistically significant improvements in lung function and other key secondary endpoints. In these patients, the mean absolute improvement in percent predicted FEV₁ between treatment with ivacaftor and placebo was 5.0 percentage points (p=0.01) and the mean relative improvement in percent predicted FEV₁ was 9.1 percent (p=0.008) in each case through the 24-week treatment period. An additional analysis was conducted on percent predicted FEV₁ four weeks following the completion of treatment with ivacaftor. Mean lung function returned toward baseline in the patients who received ivacaftor, who showed a -3.1 percentage point (p=0.001) mean absolute within-group change from Week 24 to Week 28 (four weeks after the end of treatment). Data from these subgroup analyses of patients 18 years of age and older are provided below:

	Ivacaftor (n=24)	Placebo (n=26)	Treatment Difference
Mean Absolute Change in FEV1*	4.5 (p=0.002)	-0.5 (p=0.728)	5.0 (p=0.01)
Mean Relative Change in FEV1	7.7 (p=0.002)	-1.5 (p=0.526)	9.1 (p=0.008)
Proportion of Patients with Mean Absolute Improvement in FEV1 of 5 percentage points or more	54.2%	15.4%	38.8% (p=0.007)
CFQ-R Score (respiratory domain)*	12.2 (p=<0.0001)	-0.5 (p=0.861)	12.6 (p=0.002)

*Pre-specified analyses

• Patients 12 to 17 years of age: Two patients 12 to 17 years of age enrolled in this clinical trial; one received placebo and one received ivacaftor. There were too few patients to make a statistical comparison of patients in this age range.

• Patients six to eleven years of age: Seventeen patients six to eleven years of age enrolled in this clinical trial and had a mean baseline percent predicted FEV₁ of 96 percent. In these patients, there was a mean absolute decline from baseline in percent predicted FEV₁ of -2.8 percentage points (p=0.132) in patients who received ivacaftor (n=9) compared to a mean absolute increase from baseline in percent predicted FEV₁ of 3.5 percentage points (p=0.084) for patients who received placebo (n=8). The mean absolute treatment difference was -6.3 percentage points (p=0.03).

Pediatric Formulation

We are conducting a fully-enrolled Phase 3 clinical trial to evaluate ivacaftor, in the form of minitablets or granules, as a treatment for children with CF two to five years of age with specific mutations in their CFTR gene, including the G551D

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mutation. We expect data from this clinical trial in the second quarter of 2014. If this clinical trial is successful, we plan to submit an NDA in the second half of 2014. We estimate that in North America, Europe and Australia approximately 300 patients with CF two to five years of age have one of the CFTR mutations in their CFTR gene that is being evaluated in this clinical trial.

Residual CFTR Function

We are conducting a fully-enrolled proof-of-concept Phase 2 clinical trial in which we are evaluating ivacaftor in patients with CF who have clinical evidence of residual CFTR function. We expect data from this clinical trial in the second quarter of 2014. We estimate that in North America, Europe and Australia more than 3,000 patients with CF six years of age and older have non-R117H CFTR mutations that result in residual function.

Lumacaftor in Combination with Ivacaftor

Phase 3 Program in Patients with CF Who Have Two Copies (homozygous) of the F508del Mutation

We have completed enrollment of patients in an international pivotal Phase 3 clinical program to evaluate combinations of lumacaftor and ivacaftor in patients with CF who have two copies (homozygous) of the F508del mutation in their CFTR gene. We are conducting two 24-week Phase 3 clinical trials, which are referred to as TRAFFIC and TRANSPORT, that are designed to support approval of the combination of lumacaftor and ivacaftor for patients 12 years of age and older. Each Phase 3 clinical trial enrolled approximately 550 patients with CF who are homozygous for the F508del mutation, for a total of approximately 1,100 patients. TRAFFIC and TRANSPORT are identical in design and together are being conducted at approximately 200 clinical trial sites in North America, Europe and Australia. Two treatment regimens of lumacaftor (600mg once-daily (QD) and 400mg every twelve hours (q12h)) in combination with ivacaftor (250mg every twelve hours (q12h)) are being evaluated. Fixed-dose tablets that contain both lumacaftor and ivacaftor or placebo are being used in both clinical trials. In TRAFFIC and TRANSPORT, we will evaluate absolute and relative improvement in percent predicted FEV₁, as well as change in body mass index (BMI) or weight gain, number of pulmonary exacerbations and improvements in patient-reported outcomes as measured by the CFQ-R. Following recent discussions with regulatory agencies, we have agreed that for both TRAFFIC and TRANSPORT the primary endpoint will be absolute change in percent predicted FEV₁ through 24 weeks compared to placebo. The initial 24-week treatment period in TRAFFIC and TRANSPORT is being followed by a separate rollover double-blind extension clinical trial where all eligible patients, including those who received placebo, will receive one of the combination treatment regimens for up to an additional 96 weeks.

We expect data from TRAFFIC and TRANSPORT in mid-2014. If these clinical trials are successful, we plan to submit an NDA to the FDA and an MAA in the European Union in the second half of 2014. We believe that in North America, Europe and Australia more than 28,000 patients with CF six years of age and older have two copies of the F508del mutation in their CFTR gene, including approximately 22,000 patients 12 years of age and older.

We also are conducting a clinical trial to evaluate lumacaftor in combination with ivacaftor in children with CF six to eleven years of age who have two copies of the F508del mutation. We have completed part 1 of this clinical trial and expect to begin part 2 of this clinical trial in the second half of 2014. If this clinical trial is successful, we plan to use the data from this clinical trial, along with data from TRAFFIC and TRANSPORT, for registration of this combination in patients six to eleven years of age, which we expect would occur subsequent to approval in patients 12 years of age and older, if achieved.

The two combination dosing regimens we selected for evaluation in TRAFFIC and TRANSPORT were evaluated in separate parts of a Phase 2 clinical trial of lumacaftor and ivacaftor referred to as Cohort 2 and Cohort 3. Safety results from Cohort 2 and Cohort 3 were similar to one another. In both dose groups, lumacaftor was generally well-tolerated alone and in combination with ivacaftor. The most common adverse events in both groups were respiratory in nature. In Cohort 3, one patient in the treatment group discontinued treatment because of a pulmonary adverse event.

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• Cohort 2 - We evaluated the 600mg once-daily (QD) dose of lumacaftor in combination with ivacaftor (250mg q12h) in Cohort 2 in 21 patients with CF who are homozygous for the F508del mutation. This regimen resulted in statistically significant improvements in lung function (within group and versus placebo) during the combination dosing period, as set forth in the following table:

		Mean Absolute and Relative Changes in Percent Predicted FEV1
		Day 0 - 28; lumacaftor alone	Day 28 - 56; lumacaftor + ivacaftor	Day 0 - 56
lumacaftor (600mg QD) + ivacaftor (250mg q12h)	Within Group
	Absolute	-2.9 (p=0.07)	+6.1 (p<0.001)	+3.4 (p=0.03)
	Relative	-3.5 (p=0.13)	+9.7 (p<0.001)	+5.3 (p=0.02)
	Versus Placebo
	Absolute	-2.0 (p=0.36)	+8.6 (p <0.001)	+6.7 (p=0.002)
	Relative	-3.9 (p=0.21)	+12.8 (p<0.001)	+9.2 (p=0.004)

• Cohort 3 - We evaluated the 400mg (q12h) dose of lumacaftor in combination with ivacaftor in Cohort 3 in 11 patients with CF who are homozygous for the F508del mutation. Cohort 3 also included the randomization of four patients to placebo to allow for a blinded safety assessment. Three patients completed treatment in the placebo group. The pattern of lung function response observed in Cohort 3 was similar to that observed in the 600mg (QD) dose group in Cohort 2, with a decline in FEV₁ during the lumacaftor monotherapy dosing period followed by a statistically significant increase in FEV₁ during the lumacaftor and ivacaftor combination dosing period. Additional lung function results for Cohort 3 are provided below:

		Mean Absolute and Relative Changes in Percent Predicted FEV1
		Day 0 - 28; lumacaftor alone	Day 28 - 56; lumacaftor + ivacaftor	Day 0 - 56
lumacaftor (400mg q12h) + ivacaftor (250mg q12h)	Within Group
	Absolute	-4.3 (p=0.04)	+6.6 (p=0.01)	+1.9 (p=0.57)
	Relative	-6.3 (p=0.08)	+8.8 (p=0.01)	+2.5 (p=0.67)

Phase 2 Clinical Trial in Patients with One Copy (heterozygous) of the F508del Mutation

We recently began enrollment in an 8-week Phase 2 clinical trial of lumacaftor in combination with ivacaftor in patients with CF who are 18 years of age and older and who have one copy of the F508del mutation in their CFTR gene and one copy of a mutation in their CFTR gene that is not expected to respond to either ivacaftor or lumacaftor alone. In the Phase 2 clinical trial that previously evaluated heterozygous patients, the improvement in lung function was smaller than the improvement seen in homozygous patients. The clinical trial we recently initiated was requested by the FDA and is designed to provide additional safety and lung function data on the combination of ivacaftor and lumacaftor in heterozygous patients. This clinical trial will evaluate a twice-daily administration of lumacaftor (400 mg) and ivacaftor (250 mg).

VX-661

Phase 2 Clinical Trial

In April 2013, we announced the data from a randomized, double-blind, placebo-controlled Phase 2 clinical trial of VX-661 alone and in combination with ivacaftor. This clinical trial enrolled 128 patients with CF who were 18 years of age and older with two copies of the F508del mutation. One group of patients was randomized to receive either VX-661 (10, 30, 100 and 150 mg dosed once daily), or placebo, alone for 28 days. A separate group of patients was randomized to receive the combination of VX-661 (10, 30, 100 and 150 mg dosed once daily) and ivacaftor (150 mg dosed twice daily), or placebo, for 28 days. The primary endpoints of the clinical trial were safety, tolerability and change in sweat chloride levels. Change in lung function (FEV₁) was measured as a secondary endpoint.

There were statistically significant mean absolute decreases in sweat chloride levels, both within group and versus placebo, across the combination and monotherapy groups. These changes generally were modest and were variable across the dose groups.

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VX-661 generally was well-tolerated when dosed alone and in combination with ivacaftor. The most common adverse events were pulmonary in nature. Most adverse events were mild to moderate in severity and similar between the treatment and placebo groups, and the types and frequency of adverse events were similar between the treatment and placebo groups. The rate of serious adverse events also was similar between the treatment arms and the placebo arm.

Lung Function Results for Combination Dosing

Mean absolute and relative improvements in lung function were observed in all the combination dosing groups (10, 30, 100 and 150 mg), both within group and versus placebo. The improvements in lung function were dose-dependent, with the greatest improvements observed in the groups that received the highest doses of VX-661 in combination with ivacaftor. A summary of these lung function results is provided in the following table:

Mean Changes in Lung Function	Mean Relative Change in Percent Predicted FEV1 From Baseline		Mean Absolute Change in Percent Predicted FEV1 From Baseline
	Day 0 - 28	28 Days Post-Treatment (Within-Group Mean)*	Day 0 - 28	28 Days Post-Treatment (Within-Group Mean)*
Placebo (n=23) (within group)	0.03 (NS)	1.6	-0.4 (NS)	0.6
Combination Treatment Arms	vs. Placebo		vs. Placebo
VX-661 (10 mg) + ivacaftor (150 mg) (n=17)	4.1 (NS)	1.7	2.3 (NS)	0.8
VX-661 (30 mg) + ivacaftor (150 mg) (n=17)	5.4 (NS)	1.2	3.4 (NS)	0.5
VX-661 (100 mg) + ivacaftor (150 mg) (n=15)	9.0 (p=0.01)	1.7	4.8 (p=0.01)	0.5
VX-661 (150 mg) + ivacaftor (150 mg) (n=16)	7.5 (p=0.02)	1.4	4.5 (p=0.01)	0.7

NS = Not Statistically Significant

* The statistical analysis plan (SAP) for this clinical trial did not include statistical comparisons for the 28-day washout period

Planned and Ongoing Phase 2 Clinical Trials

We are preparing to conduct an additional Phase 2 clinical trial of VX-661, a CFTR corrector compound, in combination with ivacaftor in patients with CF who have two copies of the F508del mutation in their CFTR gene. We have submitted the protocol for this 12-week Phase 2 clinical trial to the FDA and expect to begin enrollment in the first half of 2014. The primary endpoint of this clinical trial is safety, with secondary endpoints to assess efficacy and pharmacokinetics of the combination in order to characterize VX-661 for further clinical development. If the safety and efficacy data from this Phase 2 clinical trial is satisfactory, we expect to conduct further evaluation of VX-661. Long term, our primary strategy is to develop VX-661 as a triple-combination regimen with ivacaftor and a next-generation CFTR corrector compound. Additionally, we may consider developing VX-661 in a dual-combination regimen with ivacaftor.

We have completed enrollment in a Phase 2 clinical trial to evaluate a 4-week regimen of VX-661 in combination with ivacaftor in patients with one copy of the G551D mutation and one copy of the F508del mutation in their CFTR genes. This clinical trial is intended to explore whether the addition of a CFTR corrector to treatment with ivacaftor can provide greater clinical benefit than treatment with KALYDECO alone in these patients.

HCV INFECTION

Background

The Centers for Disease Control and Prevention, or CDC, has estimated that approximately 2.7 million to 3.9 million people in the United States are chronically infected with HCV. The World Health Organization, or WHO, has estimated that about 170 million people are chronically infected with HCV worldwide. Although exposure to HCV often leads to chronic infection, patients frequently do not have symptoms and are unaware that they have become infected with HCV. Over time, many patients develop liver inflammation. This inflammation can progress to scarring of the liver, called fibrosis, or more advanced scarring of the liver, called cirrhosis. Patients with cirrhosis may go on to develop liver failure or other

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complications, including liver cancer. The WHO estimates that HCV infection is responsible for more than 50% of all liver cancer cases and two-thirds of all liver transplants in the developed world.

Genotype 1 HCV infection is the most prevalent form of HCV infection in the United States and the most difficult to treat. There are many other less prevalent HCV infection genotypes, each of which tends to respond differently to treatment. Patients who are treated successfully maintain undetectable HCV RNA levels after treatment has been completed, which is referred to as a sustained viral response, or SVR.

In addition to our HCV protease inhibitor INCIVEK, there are three oral direct-acting antiviral drugs approved for the treatment of genotype 1 HCV infection in the United States: Gilead Sciences, Inc.'s, or Gilead's, SOVALDI™ (sofosbuvir), an HCV nucleotide analogue NS5B polymerase inhibitor that was approved by the FDA in December 2013; Janssen's OLYSIO™ (simeprevir), an HCV protease inhibitor that was approved by the FDA in November 2013, and Merck's VICTRELIS™ (boceprevir), an HCV protease inhibitor that was approved by the FDA in 2011. Each of these direct-acting antiviral drugs generally are prescribed in combination with pegylated-interferon, or peg-IFN, a drug that is administered by weekly injection, and ribavirin, or RBV.

INCIVEK/INCIVO/TELAVIC

INCIVEK (telaprevir) is an orally-administered HCV protease inhibitor for adults with genotype 1 HCV infection that is prescribed in combination with peg-IFN and RBV. We market INCIVEK in the United States and Canada, where it was approved in 2011. In 2011, our collaborators, Janssen and Mitsubishi Tanabe, also obtained marketing approval for telaprevir from the European Commission and the Japanese Ministry of Health, Labor and Welfare, respectively. Janssen markets telaprevir under the brand name INCIVO in Europe and other countries in its territories, and Mitsubishi Tanabe markets telaprevir under the brand name TELAVIC in Japan. Janssen paid us royalties on net sales of INCIVO through the fourth quarter of 2013 and beginning in the first quarter of 2014 has a fully-paid license to market INCIVO in its territories. Mitsubishi Tanabe also has a fully-paid license to market telaprevir in its territories. Telaprevir was discovered in our collaboration, now ended, with Eli Lilly and Company, and we pay Eli Lilly and Company royalties on net sales of telaprevir.

INCIVEK achieved rapid acceptance for the treatment of patients with genotype 1 HCV infection in the United States and accounted for a majority of our net product revenues in 2011, 2012 and 2013. However, INCIVEK revenues have been declining since reaching a peak in the fourth quarter of 2011. In response to the continued and rapid decline in the number of patients being treated with INCIVEK in the United States and anticipated competition resulting from the expected approval of direct-acting antivirals SOVALDI and OLYSIO, we reduced our promotion and support for INCIVEK in 2013. We expect that only a small portion of our net product revenues in 2014 will be due to INCIVEK.

VX-135

We are evaluating the development of all-oral, interferon-free regimens of 12 weeks or less in duration incorporating our HCV nucleotide analogue NS5B polymerase inhibitor VX-135. A number of pharmaceutical companies are investigating combination regimens that incorporate one or more of an HCV protease inhibitor, an HCV nucleotide analogue, an HCV non-nucleotide polymerase inhibitor and an NS5A inhibitor. Clinical trials of these investigational combination regimens are being conducted in a wide variety of patient populations, including treatment-naïve and treatment-failure patients, and across all HCV genotypes, which respond differently to different combinations of molecules employing different mechanisms.

Many of our competitors' potential all-oral treatment regimens are more advanced, including all-oral treatment regimens that are being evaluated in Phase 3 clinical trials by Gilead, Abbvie, Inc., or Abbvie, and BMS. While the development and regulatory timelines for drug candidates for the treatment of HCV infection are subject to risk and uncertainty, we believe that (i) substantial additional clinical data regarding potential all-oral treatment regimens will become available in 2014 and (ii) it is possible that one or more all-oral treatment regimens for genotype 1 HCV infection could be commercially available as soon the second half of 2014. As a result, if we are successful in developing an all-oral treatment regimen that includes VX-135, we expect that our all-oral treatment regimen would compete directly with several all-oral treatment regimens that were approved several years prior to the approval of our all-oral treatment regimen.

Partial Clinical Hold

In July 2013, the FDA placed a partial clinical hold on VX-135 in the United States. The partial clinical hold was placed on VX-135 in the United States following observation of reversible elevated liver enzymes in patients who received 400 mg

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of VX-135 in combination with RBV in a Phase 2 clinical trial conducted in Europe. Until the partial clinical hold has been resolved, we cannot pursue further evaluation of VX-135 in the United States.

VX-135 in Combination with Daclatasvir

We, in collaboration with BMS, are evaluating VX-135 in combination with daclatasvir, an NS5A replication complex inhibitor being developed by BMS, in a Phase 2a clinical trial. The first two cohorts of this open-label Phase 2a study of VX-135 in combination with daclatasvir were conducted in New Zealand and evaluated 100 mg and 200 mg once-daily doses of VX-135 in combination with daclatasvir once daily (60 mg) for 12 weeks of total treatment. Twenty-three patients with genotype 1 HCV who were new to treatment (treatment-naïve) and did not have liver cirrhosis were enrolled in these cohorts. More than 75 percent of all patients enrolled had genotype 1a HCV infection.

• 200 mg of VX-135 in Combination with Daclatasvir (60 mg):Based on the intent-to-treat analysis, 58 percent (7 of 12) of patients in this treatment arm had undetectable HCV RNA levels after 4 weeks of treatment and 83 percent (10 of 12) of these patients had undetectable HCV RNA levels four weeks after the completion of treatment, or SVR4. One patient in this treatment arm experienced a serious adverse event (vomiting/nausea) and discontinued treatment after the first dose. This patient did not achieve SVR4. The eleven other patients in this arm completed 12 weeks of treatment and 91 percent (10 of 11) of these patients achieved SVR4. One patient relapsed during the follow-up period and did not achieve SVR4.

• 100 mg of VX-135 in Combination with Daclatasvir (60 mg): Based on an intent-to-treat analysis, 73 percent (8 of 11) of patients in this treatment arm achieved undetectable HCV RNA levels after 4 weeks of treatment and 73 percent (8 of 11) of patients had undetectable HCV RNA levels four weeks after the completion of treatment (SVR4). Two patients in this arm experienced viral breakthrough while receiving the combination regimen, and one patient relapsed during the follow-up period.

We are in discussions with Alios BioPharma, Inc., or Alios, and BMS regarding these data and potential next steps for further evaluation of VX-135 in combination with daclatasvir.

AUTOIMMUNE DISEASES (RHEUMATOID ARTHRITIS)

Background

Autoimmune diseases, including rheumatoid arthritis, or RA, are characterized by inflammation that is believed to be the result of an incorrectly regulated immune response. Rheumatoid arthritis is a chronic disease that affects 0.5% to 1.0% of the world’s population and, according to the CDC, approximately 1.5 million adults in the United States. Rheumatoid arthritis causes destruction of joint cartilage and erosion of adjacent bone, resulting in deformity, loss of function and substantial disability. Many patients with rheumatoid arthritis also eventually require joint replacements. There are a number of approved treatments for rheumatoid arthritis, including oral and injectable disease-modifying antirheumatic drugs, or DMARDs, and a Janus kinase (JAK) inhibitor that is marketed by Pfizer in the United States. These treatments are effective in a portion of patients with rheumatoid arthritis, but a significant portion of patients do not respond adequately to currently available drugs or experience a decrease in the effectiveness of these drugs over time. We are seeking to develop an oral therapy for the treatment of rheumatoid arthritis that could be used alone or in combination with existing DMARDs.

VX-509

VX-509 is an investigational oral drug candidate intended to inhibit Janus kinase 3, or JAK3, which is involved in the modulation of a type of white blood cell, referred to as a lymphocyte, that is central to autoimmune disease pathology. Because of JAK3’s role in lymphocyte biology, we believe it is a promising target for the design of immunosuppressant drugs for treatment of a variety of autoimmune diseases, including rheumatoid arthritis. Based on in vitro and in vivo data, VX-509 shows promise as a potent and selective inhibitor of JAK3.

We recently completed the evaluation of VX-509 in a double-blind, randomized, placebo-controlled 24-week Phase 2b clinical trial that enrolled and dosed 358 people with RA who had active disease despite methotrexate treatment. Patients in the clinical trial continued to receive stable doses of methotrexate during the clinical trial. Up to 20 percent of the patients in the clinical trial had previously been treated with a single tumor necrosis factor (TNF) inhibitor. Patients in the clinical trial were randomized to receive placebo or one of four dose regimens of VX-509 (100 mg once daily (QD), 150 mg once daily, 200 mg once daily or 100 mg given twice daily (BID)) for 24 weeks.

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The primary endpoints of the clinical trial were the proportion of patients who achieved a 20 percent improvement in signs and symptoms of RA, as measured by the ACR improvement criteria, or ACR20, response at week 12 and the change from baseline in Disease Activity Score for 28 joints, or DAS28, at week 12. Additional secondary endpoints were used to evaluate the clinical activity of VX-509, including the proportion of patients who achieved 50 percent and 70 percent improvement in signs and symptoms of RA, or ACR50 and ACR70, respectively, at week 12. In all VX-509 treatment arms, the proportion of patients achieving ACR20 and ACR50 and the decrease from baseline in DAS28 were significantly greater than in placebo. The three highest dose groups showed ACR20 responses of between 58 percent and 68 percent, compared to 18 percent for placebo, and statistically significant ACR70 responses versus placebo.

From week 12 to 24, data from this clinical trial showed continued improvements in the signs and symptoms of RA as measured by ACR20, ACR50 and ACR70.  At week 24, all doses of VX-509 showed statistically significant ACR20, ACR50 and ACR70 responses versus placebo.  Across the four VX-509 dose groups, the ACR20, ACR50 and ACR70 responses were between 61 and 63 percent, 38 and 47 percent and 15 and 25 percent, respectively, through 24 weeks of treatment.  The ACR20, ACR50 and ACR70 responses for patients who received placebo were 17, 7 and 3 percent, respectively, through 24 weeks.       

Safety results through 12 and 24 weeks of treatment were similar. Through 24 weeks, the discontinuation rate due to adverse events was 9.1 percent for the pooled VX-509 treatment group and 8.5 percent for the placebo group.  Overall, adverse event rates through 24 weeks were 59.9 percent in the pooled VX-509 treatment groups compared to 42.3 percent for those who received placebo.  There were two deaths in the clinical trial, including one death in the VX-509 200 mg QD group in a patient with pancytopenia and pneumonia and one death in the VX-509 100 mg BID group in a patient who had cardiac failure.

In addition to the Phase 2b clinical trial in RA, we have completed several drug-drug interaction studies of VX-509 in healthy volunteers. These studies demonstrate that dosing of VX-509 inhibits CYP3A4 and indicates that dose modification with frequently prescribed medicines (e.g., atorvastatin and methylprednisone) or limited concomitant use of certain medications (e.g. oral midazolam) with VX-509 may be required. We are seeking a collaborator for VX-509.

INFLUENZA

Background: Effects and Prevalence of Influenza

The CDC has estimated that in the United States more than 200,000 patients with influenza infection are hospitalized annually with respiratory and cardiac-related complications. While the number of influenza-related deaths varies significantly depending on the severity of the influenza season, the CDC has estimated the number of influenza-related deaths in the United States averages approximately 25,000 per year. In addition to vaccinations designed to prevent the spread of infection, we believe that there is a significant market for antiviral agents that could potentially be used to treat influenza. Currently, neuraminidase inhibitors oseltamivir (Tamiflu) and zanamivir (Relenza) are the antiviral agents that are used to treat influenza infection, but these drugs must be administered within 24 to 48 hours of initial infection in order to be effective and do not produce responses in a significant portion of patients.

VX-787

VX-787 is an investigational drug candidate intended for the treatment of influenza A, which is typically the predominate strain of influenza and includes H1 (pandemic) and H5 (avian) influenza strains. VX-787 aims to treat influenza A through a mechanism that is different from neuraminidase inhibitors. In March 2013, we announced data from a randomized, double-blind, placebo-controlled Phase 2 clinical trial that enrolled and dosed 104 healthy people (72 in the VX-787 arms; 32 in the placebo arm), 18 to 45 years of age, who volunteered to be experimentally exposed to an attenuated form of live H3N2 influenza A virus. In this clinical trial, we evaluated four dosing regimens of VX-787 given once daily for five days beginning 24 hours after infection with the influenza virus. The clinical trial met its primary endpoint, and patients treated with VX-787 had a statistically significant decrease in the amount of virus in nasal secretions (viral shedding) over the seven-day evaluation period as compared to patients who received placebo. Patients in the highest VX-787 dose group experienced influenza-like symptoms for a median of 1.9 days, compared to 3.7 days in the placebo group. In addition, 93 percent of patients in this dose group showed no clinical symptoms of influenza after three days of treatment, compared to 41 percent of patients in the placebo group. In this clinical trial, VX-787 was generally well-tolerated, and all patients completed treatment. There were no serious adverse events or adverse events that led to discontinuation of treatment. Overall, the most

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frequently reported class of adverse events in the VX-787 and placebo arms were those typically associated with influenza-like illness. We are seeking a collaborator to advance VX-787 development beyond this stage.

COMMERCIAL ORGANIZATION

Our commercial organization focuses on supporting sales of KALYDECO in the United States, Europe, Canada and Australia. Our sales force and managed markets organizations are responsible for promoting products to health care providers and obtaining reimbursement for products from third-party payors, including regulatory and governmental organizations in the United States and international markets. Following our October 2013 restructuring, we no longer have a U.S. field-based sales force focused on supporting sales of INCIVEK.

Our U.S. field-based CF commercial team includes approximately 15 therapeutic specialists who each have experience with CF. We focus our CF marketing efforts in the United States on a relatively small number of physicians and health care professionals who write most of the prescriptions for CF medicines. Many of these physicians and health care professionals are located at one of the approximately 110 accredited centers in the United States focused on the treatment of CF. In international markets, we have a small sales force to promote KALYDECO.

We market our products and educate physicians by calling on individual physicians, advertising, sending direct mail, public relations activities and other activities. In addition, our government affairs and public policy group advocates for policies that promote life sciences innovation and increase awareness of the diseases on which we are focusing, with state and federal legislatures, government agencies, public health officials and other policy-makers. We also have established programs in the United States that provide our products to qualified uninsured or underinsured patients at no charge or at a reduced charge, based on specific eligibility criteria.

RESEARCH

We believe that our integrated drug design approach has significantly enhanced our ability to discover and develop small molecule drug candidates directed at biologically complex targets associated with serious diseases. Our platform integrates biology, pharmacology, drug metabolism and pharmacokinetics, toxicology, material sciences, biophysics, medicinal chemistry and process chemistry, automation and information technologies in a coordinated fashion throughout the discovery process. We believe that our approach has been validated through our success in moving novel drug candidates into clinical trials and obtaining marketing approvals for KALYDECO and INCIVEK. Currently, the disease areas of highest priority to us from a research perspective are: CF and other genetic diseases; cancer; neurological diseases and disorders and autoimmune diseases. We focus our research activities on products that would be prescribed by specialist physicians for the treatment of rare or life-threatening diseases, which are referred to as specialty markets. In CF, our research group is working to identify additional corrector compounds that could be included in future dual- and/or triple-combination treatment regimens that have the potential to provide additional benefits to patients with CF.

Driven by the complexity of the disease areas selected, we attempt to identify multiple approaches within each indication that, either as a stand-alone therapy or combination therapy, could provide treatment options that are transformational in nature. We select disease areas by mapping our research strengths onto disease areas with high unmet medical need, with an emphasis on indications, where based on scientific insights, we believe that we, independently or in collaboration with other third parties, will be able to discover, develop and commercialize important medicines for serious diseases.

Our past drug discovery efforts have produced a variety of drug candidates that have been commercialized or are in preclinical or clinical development. We believe our ongoing research programs will continue to create value for us by generating new drug candidates in areas of significant unmet medical need. We expect one or more compounds from our research programs to enter into clinical development in 2014.

To augment our internal research programs, we seek to collaborate with leading academic research institutions, government laboratories, foundations and other organizations in order to advance research in our areas of therapeutic interest as well as in areas of basic technological enablement. We have established relationships with organizations and consortia of organizations from around the world with expertise in areas of interest to us and intend to leverage that experience to further our research efforts.

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COLLABORATIONS

We have entered into collaborations with pharmaceutical and other companies and organizations that provide us financial and other resources, including capabilities in research, development, manufacturing and sales and marketing, and licenses to intellectual property. These collaborations have provided us with drug candidates and/or important financial and non-financial resources that have contributed to our products and a number of the drug candidates in our current development pipeline. We may seek to license or acquire drugs, drug candidates and other technologies that have the potential to add to our pipeline or to provide us with new commercial opportunities. Furthermore, we may seek collaborators to support, develop and/or commercialize some of our current drug candidates and/or additional drug candidates that may emerge from our research activities.

Cystic Fibrosis Foundation Therapeutics Incorporated

We began working with CFFT in 1998. We entered into the current collaboration agreement with CFFT in 2004 and amended it several times to support research and development activities related to potentiator compounds and corrector compounds, including ivacaftor, lumacaftor and VX-661. Pursuant to an April 2011 amendment to the collaboration agreement, CFFT agreed to provide financial support for development activities for VX-661, a corrector compound discovered under the collaboration, and additional research and development activities directed at discovering new corrector compounds. We retain worldwide rights to develop and commercialize ivacaftor, lumacaftor, VX-661 and any other compounds discovered during the course of the research collaboration with CFFT and are obligated to pay CFFT tiered royalties ranging from single digits to sub-teens, calculated as a percentage of net sales, on ivacaftor, as well as lumacaftor, VX-661 and any other compounds discovered during the original research term or the research term that began in 2011. We have made the two commercial milestone payments required under the collaboration agreement upon achievement of certain sales levels of KALYDECO. Under the collaboration agreement, we also are obligated to make a total of two one-time commercial milestone payments upon achievement of certain sales levels for CFTR corrector compounds.

For each compound commercialized under this collaboration, we will have royalty obligations to CFFT until the expiration of patents covering that compound. We have patents in the United States and European Union covering the composition-of-matter of ivacaftor that expire in 2027 and 2025, respectively, subject to potential patent life extensions. We have patent applications in the United States and European Union covering the composition-of-matter of lumacaftor that expire in 2026, subject to potential patent life extensions. CFFT may terminate its funding obligations under the collaboration, as amended, in certain circumstances, in which case there will be a proportional reduction in the royalty rates and commercial milestone payments for certain CFTR corrector compounds. The collaboration also may be terminated by either party for a material breach by the other, subject to notice and cure provisions.

Alios BioPharma, Inc.

In June 2011, we entered into a license and collaboration agreement with Alios, a privately-held biotechnology company. Pursuant to the agreement, we are collaborating on the research, development and commercialization of VX-135, an HCV nucleotide analogue discovered by Alios. In 2012, we ended development of ALS-2158, a second HCV nucleotide analogue discovered by Alios and licensed to us pursuant to the agreement. We are responsible for all costs related to development and commercialization of VX-135. Our research program with Alios directed to the discovery of additional HCV nucleotide analogues that act on the HCV polymerase has ended.

Under the terms of the agreement, we have exclusive worldwide development and commercialization rights to VX-135. Upon entering into the agreement, we paid Alios a $60.0 million up-front payment. As of December 31, 2013, Alios had earned an aggregate of $60.0 million in development milestone payments pursuant to the agreement. The agreement provides for development milestone payments to Alios of up to an additional $312.5 million if VX-135 is approved and commercialized. Alios also is eligible to receive commercial milestone payments of up to $750.0 million, as well as tiered royalties on net sales of approved drugs.

We may terminate our agreement with Alios (i) upon 30 days’ notice to Alios if we cease development of VX-135 after it has experienced a technical failure and/or (ii) upon 60 days’ notice to Alios at any time after we complete Phase 2a clinical trials. The agreement also may be terminated by either party for a material breach by the other, and by Alios for our inactivity or if we challenge certain Alios patents, in each case subject to notice and cure provisions. Unless earlier terminated, the agreement will continue in effect until the expiration of our royalty obligations, which expire on a country-by-country basis on the later of (a) the date the last-to-expire patent covering a licensed product expires or (b) ten years after the

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first commercial sale in the country. In the United States and European Union, there are patent applications pending covering the composition-of-matter of VX-135 that, if granted, would expire in 2031.

Janssen Pharmaceutica NV

In June 2006, we entered into a license, development, manufacturing and commercialization agreement with Janssen. Under the agreement, we collaborated with Janssen on the development and commercialization of telaprevir. We have exclusive commercial rights to telaprevir in North America and led the development program for telaprevir in North America and the Janssen territories. Janssen has exclusive rights to commercialize INCIVO (telaprevir) outside of North America and the Far East. In the fourth quarter of 2013, we entered into an amendment to our agreement with Janssen, the 2013 Janssen Amendment. Pursuant to the 2013 Janssen Amendment, (i) Janssen paid us $152.0 million in the fourth quarter of 2013, (ii) Janssen's obligations to pay us royalties on net sales of INCIVO terminated after the fourth quarter of 2013, and (iii) Janssen received a fully-paid license to commercialize INCIVO in its territories, subject to the continued payment of certain third-party royalties on net sales of INCIVO in its territories.

The agreement will continue in effect until the later of (i) the expiration of the last-to-expire patent covering INCIVO or (ii) the last to expire third-party royalty payment on net sales of INCIVO. In the European Union, there is a patent covering the composition-of-matter of INCIVO that expires in 2026.

Mitsubishi Tanabe Pharma Corporation

We have a collaboration agreement with Mitsubishi Tanabe pursuant to which Mitsubishi Tanabe has a fully-paid license to manufacture and commercialize TELAVIC (telaprevir) to treat HCV infection in Japan and other specified countries in the Far East. This agreement was entered into in 2004 and amended in 2009. Pursuant to this agreement, Mitsubishi Tanabe provided financial and other support for the development and commercialization of telaprevir, made a $105.0 million payment to us in connection with the 2009 amendment of the collaboration agreement and made a $65.0 million payment to us in the fourth quarter of 2011 related to the commercialization of TELAVIC in Japan. There are no further payments due to us under this collaboration agreement. Mitsubishi Tanabe is responsible for its own development and manufacturing costs in its territory. Mitsubishi Tanabe may terminate the agreement at any time without cause upon 60 days’ prior written notice to us. The agreement also may be terminated by either party for a material breach by the other, subject to notice and cure provisions. Unless earlier terminated, the agreement will continue in effect until the expiration of the last-to-expire patent covering TELAVIC. In Japan, we have a patent covering the composition-of-matter of TELAVIC that expires in 2021.

INTELLECTUAL PROPERTY

We actively seek protection for our products and proprietary information by means of U.S. and foreign patents, trademarks and copyrights, as appropriate. In addition, we rely upon trade secret protection and contractual arrangements to protect certain of our proprietary information and products. We have patents and pending patent applications that relate to potential drug targets, compounds we are developing to modulate those targets, methods of making or using those compounds and proprietary elements of our drug discovery platform.

Much of our technology and many of our processes depend upon the knowledge, experience and skills of key scientific and technical personnel. To protect our rights to our proprietary know-how and technology, we require all employees, as well as our consultants and advisors when feasible, to enter into confidentiality agreements that require disclosure and assignment to us of ideas, developments, discoveries and inventions made by these employees, consultants and advisors in the course of their service to us.

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While we have numerous issued patents and pending patent applications in our patent portfolio, we believe that the patents and patent applications in the United States and the European Union that are the most important to our business are those that claim the composition-of-matter of our drugs and drug candidates that have progressed at least into Phase 2 clinical trials. The following table sets forth the status of the primary patents and patent applications in the United States and the European Union covering the composition-of-matter of these drugs and drug candidates:

Drug/Drug Candidate	Status of United States Patent (Anticipated Expiration, Subject to Potential Extensions)	Status of European Union Patent (Anticipated Expiration, Subject to Potential Extensions)
KALYDECO (ivacaftor)	Granted (2027)	Application Pending (2025)
lumacaftor	Application Pending (2026)	Application Pending (2026)
VX-661	Granted (2027)	Application Pending (2027)
INCIVEK/INCIVO (telaprevir)	Granted (2025)	Granted (2026)
VX-135	Application Pending (2031)	Application Pending (2031)
VX-509	Granted (2026)	Application Pending (2025)
VX-787	Application Pending (2030)	Application Pending (2030)

We hold issued patents and pending patent applications in the United States, and in foreign countries we deem appropriate, claiming intellectual property developed as part of our research and development programs. In addition to the composition-of-matter patents and patent applications listed above, our intellectual property holdings include:

• U.S. and foreign patent applications covering potentiator compounds and corrector compounds for the CFTR protein, including ivacaftor, lumacaftor and VX-661 and many other related compounds, and the use of those potentiators and correctors to treat CF.

• U.S. and foreign patents and patent applications covering telaprevir and other HCV protease and polymerase inhibitors and the use of these compounds to treat HCV infection.

• U.S. and foreign patent applications licensed from Alios covering VX-135 and the use of VX-135 to treat HCV infection.

• U.S. and foreign patents and patent applications covering inhibitors of a variety of kinase proteins, including VX-509, and the use of those inhibitors to treat autoimmune disease, including rheumatoid arthritis.

• U.S. and foreign patents and patent applications covering influenza virus inhibitors, including VX-787.

• U.S. and foreign patents and patent applications covering the manufacture, pharmaceutical compositions, related solid forms, formulations, dosing regimens and methods of use of these compounds, including our two marketed products ivacaftor and telaprevir.

We cannot be certain, however, that issued patents will be enforceable or provide adequate protection or that pending patent applications will result in issued patents.

From time to time we enter into non-exclusive license agreements for proprietary third-party technology used in connection with our research activities. These license agreements typically provide for the payment by us of a license fee, but may also include terms providing for milestone payments or royalties for the development and/or commercialization of our drug products arising from the related research.

Ivacaftor was granted orphan drug status in the United States and the European Union. We have a U.S. patent that covers the composition-of-matter of ivacaftor that we expect will provide intellectual property protection in the United States through its expiration date in 2027. We are entitled to orphan drug exclusivity for ivacaftor in the United States, which means that the FDA may not approve another application to market ivacaftor for the same indication for a period of seven years from approval except in very limited circumstances. As a result of the seven-year orphan drug marketing exclusivity period, even if a competitor successfully challenges the ivacaftor patents, it could not obtain approval from the FDA to market ivacaftor for the treatment of patients with a G551D mutation in their CFTR gene in the United States until January 2019.

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MANUFACTURING

Manufacturing Approach and Philosophy

As we market and sell our approved products and advance our drug candidates through clinical development toward commercialization, we continue to build and maintain our supply chain and quality assurance resources. We rely on an international network of third parties, including sole source suppliers of certain components of our products and drug candidates, to manufacture and distribute our products for commercial sale and post-approval clinical trials and to manufacture and distribute our drug candidates for clinical trials. We expect that we will continue for the foreseeable future to rely on third parties to meet most of our commercial supply needs and some of our clinical supply needs. We are in the process of establishing our own small-scale manufacturing capabilities, which we plan to use for clinical trial supplies and as a secondary source for commercial supplies.

Our supply chain for sourcing raw materials and manufacturing drug product ready for distribution is a multi-step international endeavor. Third-party contract manufacturers, including some in China, supply us with raw materials, and contract manufacturers in the European Union and the United States convert these raw materials into drug substance, and convert the drug substance into final dosage form. Establishing and managing this global supply chain for each of our drugs and drug candidates requires a significant financial commitment and the creation and maintenance of numerous third-party contractual relationships.

We have developed systems and processes to track, monitor and oversee our third-party manufacturers’ activities, including a quality assurance program intended to ensure that our third-party manufacturers comply with current Good Manufacturing Practices, or cGMP. We regularly evaluate the performance of our third-party manufacturers with the objective of confirming their continuing capabilities to meet our needs efficiently and economically. Manufacturing facilities, both foreign and domestic, are subject to inspections by or under the authority of the FDA and other U.S. and foreign government authorities.

Manufacture of KALYDECO (ivacaftor)

We obtain ivacaftor to meet our commercial and clinical supply needs through a third-party manufacturing network. A disruption in the commercial supply of KALYDECO would have a significant effect on patients, our business and our product revenues. A disruption in the clinical supply of ivacaftor could delay the completion of clinical trials and/or affect timelines for submitting an sNDA or NDA. Our supply chain includes a sole-source manufacturer that has the capability of providing its services to us from multiple sites. In 2013, we obtained an alternative source for the active ingredient of ivacaftor.

Manufacture of Co-formulated Ivacaftor/Lumacaftor

We are planning to use a continuous manufacturing process in order to manufacture co-formulated lumacaftor and ivacaftor tablets. We have established continuous manufacturing capabilities at our third-party manufacturer in the United Kingdom, which was used to produce a portion of the clinical trial supplies for our Phase 3 clinical trials of lumacaftor in combination with ivacaftor, and are in the process of establishing continuous manufacturing capabilities and seeking validation for these capabilities at our new facility located in Boston, Massachusetts. We are upgrading the continuous manufacturing process at our third-party manufacturer and are scheduled to begin producing co-formulated lumacaftor and ivacaftor intended for commercial use in mid-2014. Continuous process manufacturing connects the processes used in traditional batch manufacturing and uses on-line monitoring in order to increase control of the manufacturing process. The goal of continuous process manufacturing is to reduce material waste and cycle times and improve yield, which may result in reduced cost, reduced development and production timelines, lower inventories and increased market response flexibility. While continuous process manufacturing has been used in many industries, we believe that we would be the first company to seek approval for an NDA using a continuous manufacturing process. As a result, we also have designed and tested a non-continuous process for manufacturing co-formulated lumacaftor and ivacaftor tablets that we would seek to utilize if we experience delays associated with the continuous manufacturing process.

COMPETITION

The pharmaceutical industry is characterized by extensive research efforts, rapid technological progress and intense competition. There are many public and private companies, including pharmaceutical companies and biotechnology companies, engaged in developing products for the indications our drugs are approved to treat and the therapeutic areas we are targeting with our research and development activities. Many of our competitors have substantially greater financial,

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technical and human resources than we do. We face competition based on the safety and efficacy of our products and drug candidates, the timing and scope of regulatory approvals, the availability and cost of supply, marketing and sales capabilities, reimbursement coverage, price, patent protection and other factors. Our competitors may develop or commercialize more effective, safer or more affordable products than we are able to develop or commercialize or obtain more effective patent protection. As a result, our competitors may commercialize products more rapidly or effectively than we do, which would adversely affect our competitive position, the likelihood that our drug candidates, if approved, would achieve and maintain market acceptance and our ability to generate meaningful revenues from our products. Future competitive products may render our products, or future products, obsolete or noncompetitive.

Cystic Fibrosis

A number of companies are seeking to identify and develop drug candidates for the treatment of CF, including Novartis, Pfizer, Genzyme, which is a division of Sanofi, and several private companies. While we are the first company to successfully develop a drug that treats the underlying cause of CF, KALYDECO is approved to treat only a small portion of patients with CF. Our competitors have research and development programs directed at identifying and developing CFTR potentiators, CFTR correctors and drug candidates with other mechanisms of action that seek to address the underlying cause of CF, and our success in rapidly developing and commercializing KALYDECO may increase the resources that our competitors allocate to the development of these potential treatments for CF. We do not believe that any of these competitive programs yet have entered late-stage clinical development. However, in the future, if one or more competing therapies are successfully developed as a treatment for patients with CF, our revenues from KALYDECO and/or our other CF drug candidates, if then approved, could face significant competitive pressure.

HCV Infection

The number and type of treatments for HCV infection has changed, and likely will continue to change, rapidly. Factors that may affect the market for any specific HCV treatment regimen include the introduction of new competitive drugs or drug combinations, increased sales from currently-approved drugs, adverse information regarding the safety characteristics or efficacy of the regimen, significant new information regarding potential treatment regimens being evaluated in clinical trials and enrollment by patients in clinical trials being conducted by us or our competitors.

Since 2011, we have marketed INCIVEK in direct competition with Merck & Co., Inc.'s VICTRELIS (boceprevir), another HCV protease inhibitor. In the fourth quarter of 2013, the FDA approved Gilead's SOVALDI (sofosbuvir), an HCV nucleotide analogue NS5B polymerase inhibitor and Janssen's OLYSIO™ (simeprevir), the third HCV protease inhibitor. Each of these direct-acting antiviral drugs are generally prescribed in combination with peg-IFN and RBV. Due to increased competition from newly introduced competitive therapies and our reduced promotion of INCIVEK, we expect that only a small portion of our net product revenues in 2014 will be due to INCIVEK.

On the basis of clinical data reported by our competitors from numerous late-stage clinical trials, it appears likely that the recent approval of SOVALDI and OLYSIO could be quickly followed by drugs to be co-administered in all-oral regimens that do not require peg-IFN, an injectable. Many companies are seeking to develop all-oral treatment regimens for HCV infection that could render uncompetitive current and future treatment regimens that include the administration of peg-IFN by injection. Many of our competitors' potential all-oral treatment regimens are more advanced than VX-135 combination regimens, including all-oral treatment regimens that are being evaluated in Phase 3 clinical trials being conducted by Gilead, Abbvie and BMS. While the development and regulatory timelines for these drug candidates are subject to risk and uncertainty, we believe that (i) substantial additional clinical data regarding potential all-oral treatment regimens will become available in 2014 and (ii) it is possible that one or more all-oral treatment regimens for genotype 1 HCV infection could be commercially available as soon the second half of 2014. As a result, if we are successful in developing an all-oral treatment regimen that includes VX-135, we expect that our all-oral treatment regimen would compete directly with several all-oral treatment regimens that were approved several years prior to the approval of our all-oral treatment regimen.

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Where companies have control of multiple drug candidates that span different mechanisms of action, they typically are investigating combination regimens of those drug candidates, with or without the addition of RBV. In addition, many companies, including us, are pursuing a strategy of evaluating drug candidates they control in combination with drug candidates controlled by third parties. For example, we entered into a non-exclusive collaboration to evaluate VX-135 in combination with BMS's HCV NS5A inhibitor daclatasvir, and BMS is evaluating daclatasvir in combination with Gilead's SOVALDI. There can be no assurance that third parties will agree to enter into or expand existing collaborative arrangements with respect to the development of combination regimens for the treatment of HCV infection that include VX-135.

GOVERNMENT REGULATION

The research, development, testing, manufacture, quality control, approval, labeling, packaging, storage, record keeping, promotion, advertising, distribution and marketing of our products and drug candidates are subject to extensive regulation by United States and foreign governmental authorities.

United States Government Regulation

New Drug Application Approval Processes

In the United States, the FDA regulates drugs under the Federal Food, Drug and Cosmetic Act, or the FDCA, and implementing regulations. The process of obtaining regulatory approvals and the subsequent compliance with applicable federal, state, local and foreign statutes and regulations require the expenditure of substantial time and financial resources. Failure to comply with the applicable U.S. requirements at any time during the drug development process, approval process or after approval, may subject us to administrative or judicial sanctions, any of which could have a material adverse effect on us. These sanctions could include:

• refusal to approve pending applications;

• withdrawal of an approval;

• imposition of a clinical hold;

• warning letters;

• product seizures;

• total or partial suspension of production or distribution; or

• injunctions, fines, disgorgement, or civil or criminal penalties.

The process required by the FDA before a drug may be marketed in the United States generally involves the following:

• completion of preclinical laboratory tests, animal studies and formulation studies conducted according to Good Laboratory Practices, or GLP, and other applicable regulations;

• submission to the FDA of an investigational new drug, or IND, application, which must become effective before clinical trials in the United States may begin;

• performance of adequate and well-controlled clinical trials according to Good Clinical Practices, or GCP, to establish the safety and efficacy of the proposed drug for its intended use;

• submission to the FDA of an NDA;

• satisfactory completion of an FDA inspection of the manufacturing facility or facilities at which the product will be produced to assess compliance with cGMP to assure that the facilities, methods and controls are adequate to preserve the product’s identity, strength, quality and purity; and

• FDA review and approval of the NDA.

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Once a drug candidate is identified for development, it enters the preclinical testing stage. Preclinical tests include laboratory evaluations of product chemistry, toxicity and formulation, as well as animal pharmacology and toxicology studies. An IND sponsor must submit the results of the preclinical tests, together with manufacturing information and analytical data, to the FDA as part of the IND. Preclinical or nonclinical testing typically continues even after the IND is submitted. In addition to including the results of the preclinical studies, the IND also will include a protocol detailing, among other things, the objectives of the initial clinical trial and the parameters to be used in monitoring safety. The IND automatically becomes effective 30 days after receipt by the FDA, unless the FDA, within the 30-day time period, places the IND on clinical hold. If an IND is placed on clinical hold, the IND sponsor and the FDA must resolve any outstanding concerns before clinical trials can begin. A clinical hold may occur at any time during the life of an IND, and may affect one or more specific clinical trials or all clinical trials conducted under the IND.

All clinical trials must be conducted under the supervision of one or more qualified investigators in accordance with GCP. They must be conducted under protocols detailing the objectives of the trial, dosing procedures, subject selection and exclusion criteria and the safety and effectiveness criteria to be evaluated. Each protocol and any amendments must be submitted to the FDA as part of the IND, and progress reports detailing the results of the clinical trials must be submitted at least annually to the FDA and more frequently in other situations, including the occurrence of serious adverse events. An institutional review board, or IRB, at each institution participating in the clinical trial must review and approve the protocol and any amendments before a clinical trial commences or continues at that institution, approve the information regarding the clinical trial and the consent form that must be provided to each trial subject or his or her legal representative, and monitor the clinical trial until completed and otherwise comply with IRB regulations.

Clinical trials typically are conducted in three sequential phases that may overlap or be combined:

• Phase 1. The drug initially is introduced into healthy human subjects and tested for safety, dosage tolerance, absorption, metabolism, distribution and elimination. In the case of some drug candidates for severe or life-threatening diseases, such as cancer, especially when the drug candidate may be inherently too toxic to ethically administer to healthy volunteers, the initial human testing is often conducted in patients.

• Phase 2. Clinical trials are initiated in a limited patient population intended to identify possible adverse effects and safety risks, to preliminarily evaluate the efficacy of the drug candidate for specific targeted diseases and to determine dosage tolerance and optimal dosage.

• Phase 3. Clinical trials are undertaken to further evaluate dosage, clinical efficacy and safety in an expanded patient population at geographically dispersed clinical trial sites. These clinical trials are intended to establish the overall risk-benefit ratio of the drug candidate and provide an adequate basis for regulatory approval and product labeling.

Phase 1, Phase 2 and Phase 3 testing may not be completed successfully within any specified period, if at all. The FDA or the sponsor may suspend a clinical trial at any time for a variety of reasons, including a finding that the healthy volunteers or patients are being exposed to an unacceptable health risk. Similarly, an IRB can suspend or terminate approval of a clinical trial at its institution if the clinical trial is not being conducted in accordance with the IRB’s requirements or if the drug candidate has been associated with unexpected serious harm to healthy volunteers or patients.

We estimate that it generally takes 10 to 15 years, or possibly longer, to discover, develop and bring to market a new pharmaceutical product in the United States, as outlined below:

Phase	Estimated Duration
Discovery	2 to 4 years
Preclinical	1 to 2 years
Phase 1	1 to 2 years
Phase 2	2 to 4 years
Phase 3	2 to 4 years
FDA approval	6 months to 2 years

During the development of a new drug, sponsors are given opportunities to meet with the FDA at certain points. These points may be prior to submission of an IND, at the end of Phase 2 testing, and before an NDA is submitted. Meetings at other times may be requested. These meetings can provide an opportunity for the sponsor to share information about the data gathered to date, for the FDA to provide advice, and for the sponsor and FDA to reach agreement on the next phase of

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development. Sponsors typically use the end of Phase 2 meeting to discuss their Phase 2 clinical results and present their plans for the pivotal Phase 3 clinical trial that they believe will support approval of the drug candidate.

Concurrently with clinical trials, companies usually complete additional animal safety studies and also must develop additional information about the chemistry and physical characteristics of the drug and finalize a process for manufacturing the product in accordance with cGMP requirements. The manufacturing process must be capable of consistently producing quality batches of the drug candidate, and the manufacturer must develop methods for testing the quality, purity and potency of the final products. Additionally, appropriate packaging must be selected and tested and stability studies must be conducted to demonstrate that the drug candidate does not undergo unacceptable deterioration over its shelf-life.

The results of drug development, preclinical studies and clinical trials, along with descriptions of the manufacturing process, analytical tests conducted on the chemistry of the drug candidate, proposed labeling and other relevant information are submitted to the FDA as part of an NDA requesting approval to market the drug candidate. The FDA reviews each NDA submitted to ensure that it is sufficiently complete for substantive review before it accepts it for filing. It may request additional information rather than accept an NDA for filing.

Once the submission is accepted for filing, the FDA begins an in-depth review. The FDA may not approve an NDA if the applicable regulatory criteria are not satisfied or may require additional clinical or other data. Even if such data are submitted, the FDA may ultimately decide that the NDA does not satisfy the criteria for approval. The FDA reviews an NDA to determine, among other things, whether a drug candidate is safe and effective for its intended use and whether its manufacturing is cGMP-compliant to assure and preserve the drug candidate’s identity, strength, quality and purity. The FDA may refer the NDA to an advisory committee for review and recommendation as to whether the NDA should be approved and under what conditions. The FDA is not bound by the recommendation of an advisory committee, but it generally follows such recommendations. Before approving an NDA, the FDA will inspect the facility or facilities where the drug candidate is manufactured and tested.

The FDA may require, as a condition of approval, restricted distribution and use, enhanced labeling, special packaging or labeling, expedited reporting of certain adverse events, pre-approval of promotional materials, restrictions on direct-to-consumer advertising or commitments to conduct additional research post-approval. The FDA will issue a complete response letter if the agency decides not to approve the NDA in its present form. The complete response letter usually describes all of the specific deficiencies in the NDA identified by the FDA. If a complete response letter is issued, the applicant may either resubmit the NDA, addressing all of the deficiencies identified in the letter, or withdraw the application.

Expedited Review and Approval

The FDA has various programs, including Fast Track, priority review, and accelerated approval, that are intended to expedite or simplify the process for reviewing drug candidates, and/or provide for approval on the basis of surrogate endpoints. Even if a drug candidate qualifies for one or more of these programs, the FDA may later decide that the drug candidate no longer meets the conditions for qualification or that the time period for FDA review or approval will not be shortened. Generally, drug candidates that may be eligible for these programs are those for serious or life-threatening conditions, those with the potential to address unmet medical needs, and those that offer meaningful benefits over existing treatments. For example, Fast Track is a process designed to facilitate the development, and expedite the review of drug candidates to treat serious diseases and fill an unmet medical need. Priority review is designed to give drug candidates that offer major advances in treatment or provide a treatment where no adequate therapy exists an initial review within six months as compared to a standard review time of ten months. Although Fast Track and priority review do not affect the standards for approval, the FDA will attempt to facilitate early and frequent meetings with a sponsor of a Fast Track designated drug candidate and expedite review of the application for a drug candidate designated for priority review. Accelerated approval provides an earlier approval of drugs that treat serious diseases, and that fill an unmet medical need based on a surrogate endpoint, which is a laboratory measurement or physical sign used as an indirect or substitute measurement representing a clinically meaningful outcome. As a condition of approval, the FDA may require that a sponsor of a product receiving accelerated approval perform post-marketing clinical trials.

Post-approval Requirements

Once an approval is granted, the FDA may withdraw the approval if compliance with regulatory standards is not maintained or if problems occur after the product reaches the market. Later discovery of previously unknown problems with a product may result in restrictions on the product or complete withdrawal of the product from the market. In addition, under

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the FDCA the sponsor of an approved drug in the United States may not promote that drug for unapproved, or off-label, uses, although a physician may prescribe a drug for an off-label use in accordance with the practice of medicine. After approval, some types of changes to the approved product, such as adding new indications, manufacturing changes and additional labeling claims, are subject to further FDA review and approval. In addition, the FDA may require testing and surveillance programs to monitor the effect of approved products that have been commercialized, and the FDA has the power to prevent or limit further marketing of a product based on the results of these post-marketing programs.

Products manufactured or distributed by us pursuant to FDA approvals are subject to continuing regulation by the FDA, including, among other things:

• record-keeping requirements;

• reporting of adverse experiences with the product;

• providing the FDA with updated safety and efficacy information;

• drug sampling and distribution requirements;

• notifying the FDA and gaining its approval of specified manufacturing or labeling changes;

• complying with certain electronic records and signature requirements; and

• complying with FDA promotion and advertising requirements.

Drug manufacturers and other entities involved in the manufacture and distribution of approved products are required to register with the FDA and certain state agencies, and are subject to periodic unannounced inspections by the FDA and some state agencies for compliance with cGMP and other laws.

We rely, and expect to continue to rely, on third parties for the production of our products. Future FDA and state inspections may identify compliance issues at the facilities of our contract manufacturers that may disrupt manufacture or distribution of our products, or require substantial resources to correct.

From time to time, new legislation is enacted that changes the statutory provisions governing the approval, manufacturing and marketing of products regulated by the FDA. In addition, FDA regulations and guidance often are revised or reinterpreted by the agency in ways that may significantly affect our business and our products. It is impossible to predict whether legislative changes will be enacted, or FDA regulations, guidance or interpretations changed.

Patent Term Restoration and Marketing Exclusivity

Depending upon the timing, duration and specifics of FDA approval of the use of our drugs, some of our United States patents may be eligible for limited patent term extension under the Drug Price Competition and Patent Term Restoration Act of 1984, referred to as the Hatch-Waxman Amendments. The Hatch-Waxman Amendments permit a patent restoration term of up to five years as compensation for patent term lost during product development and the FDA regulatory review process. However, patent term restoration cannot extend the remaining term of a patent beyond a total of 14 years from the product’s approval date. The patent term restoration period is generally one-half the time between the effective date of an IND, and the submission date of an NDA, plus the time between the submission date of an NDA and the approval of that application. Only one patent applicable to an approved product is eligible for the extension and the extension must be applied for prior to expiration of the patent. The United States Patent and Trademark Office, in consultation with the FDA, reviews and approves the application for any patent term extension or restoration. In the future, we may apply for restorations of patent term for some of our currently owned or licensed patents to add patent life beyond their current expiration date, depending on the expected length of clinical trials and other factors involved in the submission of the relevant NDA.

Market exclusivity provisions under the FDCA also can delay the submission or the approval of certain applications. The FDCA provides a five-year period of non-patent marketing exclusivity within the United States to the first applicant to gain approval of an NDA for a new chemical entity. For a new chemical entity that qualifies for Orphan Drug designation, the FDCA provides such marketing exclusivity for a period of seven years. A product is a new chemical entity if the FDA has not previously approved any other new product containing the same active moiety, which is the molecule responsible for the action of the drug substance. During the exclusivity period, the FDA may not accept for review an abbreviated new drug application, or ANDA, or a 505(b)(2) NDA submitted by another company for another version of such product where the

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applicant does not own or have a legal right of reference to all the data required for approval. However, an application may be submitted after four years if it contains a certification of patent invalidity or non-infringement. The FDCA also provides three years of marketing exclusivity for an NDA, 505(b)(2) NDA or supplement to an existing NDA if new clinical investigations, other than bioavailability studies, that were conducted or sponsored by the applicant are deemed by the FDA to be essential to the approval of the application, for example, for new indications, dosages, or strengths of an existing drug. This three-year exclusivity covers only the conditions associated with the new clinical investigations and does not prohibit the FDA from approving ANDAs for drugs containing the original active agent.

Pediatric Exclusivity

Section 505A of the FDCA, as amended by the FDA Amendments Act of 2007, permits certain drugs to obtain an additional six months of exclusivity, if the sponsor submits information requested in writing by the FDA, or a written request, relating to the use of the drug in children. The FDA may not issue a written request for clinical trials on unapproved or approved indications or where it determines that information relating to the use of a drug in a pediatric population, or part of the pediatric population, may not produce health benefits in that population.

Foreign Regulation

In addition to regulations in the United States, we are subject to a variety of foreign regulations governing clinical trials and commercial sales and distribution of our products. Whether or not we obtain FDA approval for a drug candidate, we must obtain approval by the comparable regulatory authorities of foreign countries or economic areas, such as the European Union, before we can commence clinical trials or market products in those countries or areas. The approval process and requirements governing the conduct of clinical trials, product licensing, pricing and reimbursement vary greatly from place to place, and the time may be longer or shorter than that required for FDA approval.

Under European Union regulatory systems, a company may submit marketing authorization applications either under a centralized or decentralized procedure. The centralized procedure, which is compulsory for medicines produced by biotechnology or those medicines intended to treat AIDS, cancer, neurodegenerative disorders, or diabetes and optional for those medicines that are highly innovative, provides for the grant of a single marketing authorization that is valid for all European Union member states. The decentralized procedure provides for approval by one or more “concerned” member states based on an assessment of an application performed by one member state, known as the “reference” member state. Under the decentralized approval procedure, an applicant submits an application, or dossier, and related materials to the reference member state and concerned member states. The reference member state prepares a draft assessment and drafts of the related materials within 120 days after receipt of a valid application. Within 90 days of receiving the reference member state’s assessment report, each concerned member state must decide whether or not to approve the assessment report and related materials. If a member state does not recognize the marketing authorization, the disputed points are eventually referred to the European Commission, whose decision is binding on all member states.

Orphan Drug Designation

Under the Orphan Drug Act, the FDA may grant orphan drug designation to drug candidates intended to treat a rare disease or condition, which is generally a disease or condition that affects fewer than 200,000 people in the United States, or more than 200,000 people in the United States and for which there is no reasonable expectation that the cost of developing and making available in the United States a drug for this type of disease or condition will be recovered from sales in the United States for that drug. Orphan drug designation must be requested before submitting an NDA. After the FDA grants orphan drug designation, the identity of the therapeutic agent and its potential orphan use are disclosed publicly by the FDA. Orphan drug designation does not convey any advantage in or shorten the duration of the regulatory review and approval process. KALYDECO and lumacaftor have been granted designation as orphan drugs by the FDA.

If a drug candidate that has orphan drug designation subsequently receives the first FDA approval for the disease for which it has such designation, the product is entitled to orphan drug exclusivity, which means that the FDA may not approve any other applications to market the same drug for the same indication, except in very limited circumstances, for seven years. Orphan drug exclusivity, however, also could block the approval of our drug candidates for seven years if a competitor obtains approval of the same product as defined by the FDA or if our drug candidate is determined to be contained within the competitor’s product for the same indication or disease.

As in the United States, we may apply for designation of a drug candidate as an orphan drug for the treatment of a specific indication in the European Union before the application for marketing authorization is made. Orphan drugs in

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Europe enjoy economic and marketing benefits, including up to 10 years of market exclusivity for the approved indication unless another applicant can show that its product is safer, more effective or otherwise clinically superior to the orphan-designated product.

The FDA and foreign regulators expect holders of exclusivity for orphan drugs, such as KALYDECO, to assure the availability of sufficient quantities of their orphan drugs to meet the needs of patients. Failure to do so could result in the withdrawal of marketing exclusivity for the orphan drug.

Breakthrough Therapy Designation

In July 2012, the Food and Drug Administration Safety and Innovation Act, or FDASIA, was enacted, amending the FDCA. As part of FDASIA, Congress created a new drug designation called “Breakthrough Therapy.” This designation is intended to facilitate expedited development and review of a compound which, alone or in combination with one or more other compounds, is intended to treat a serious or life-threatening disease or condition and for which preliminary clinical evidence indicates that the compound may demonstrate substantial clinical improvement over existing therapies. Breakthrough Therapy designation may be requested at the filing of, or as an amendment to, an IND based on criteria established by the FDA.

Actions identified in FDASIA that may expedite the development and review of a Breakthrough Therapy include, as appropriate: holding meetings with the sponsor and the review team throughout the development of the drug; involving senior managers and experienced review staff, as appropriate, in a collaborative, cross-disciplinary review; and assigning a cross-disciplinary project lead for the FDA review team to facilitate efficient review of the development program and serve as a scientific liaison between the review team and the sponsor. We expect that over time the FDA will develop regulations and/or provide additional guidance regarding the development of drug candidates that receive Breakthrough Therapy designation. As this is an evolving regulatory designation, we cannot determine the specific implications of the Breakthrough Therapy designations on our development programs.

Reimbursement

Sales of our products depend, in part, on the extent to which our products will be covered by third-party payors, such as government health programs, commercial insurance and managed health care organizations. These third-party payors increasingly are reducing reimbursements for medical products and services. Additionally, the containment of health care costs has become a priority of federal and state governments, and the prices of drugs have been a focus in this effort. The U.S. government, state legislatures and foreign governments have shown significant interest in implementing cost-containment programs, including price controls, restrictions on reimbursement and requirements for substitution of generic products. Adoption of price controls and cost-containment measures, and adoption of more restrictive policies in jurisdictions with existing controls and measures, could limit our revenues. Decreases in third-party reimbursement for a product or a decision by a third-party payor to not cover a product could reduce physician usage of the product.

The Medicare Prescription Drug, Improvement, and Modernization Act of 2003, or the MMA, established the Medicare Part D program to provide a voluntary prescription drug benefit to Medicare beneficiaries. Under Part D, Medicare beneficiaries may enroll in prescription drug plans offered by private entities, which will provide coverage of outpatient prescription drugs. Unlike Medicare Part A and B, Part D coverage is not standardized. Part D prescription drug plan sponsors are not required to pay for all covered Part D drugs, and each drug plan can develop its own drug formulary that identifies which drugs it will cover and at what tier or level. However, Part D prescription drug formularies must include drugs within each therapeutic category and class of covered Part D drugs, though not necessarily all the drugs in each category or class. Any formulary used by a Part D prescription drug plan must be developed and reviewed by a pharmacy and therapeutic committee. Government payment for some of the costs of prescription drugs may increase demand for products for which we receive marketing approval. However, any negotiated prices for our products covered by a Part D prescription drug plan likely will be lower than the prices we might otherwise obtain. Moreover, while the MMA applies only to drug benefits for Medicare beneficiaries, private payors often follow Medicare coverage policy and payment limitations in setting their own payment rates. Any reduction in payment that results from the MMA may result in a similar reduction in payments from non-governmental payors.

The American Recovery and Reinvestment Act of 2009 provides funding for the federal government to compare the effectiveness of different treatments for the same illness. A plan for the research will be developed by the Department of Health and Human Services, or HHS, the Agency for Healthcare Research and Quality and the National Institutes of Health,

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and periodic reports on the status of the research and related expenditures will be made to the U.S. Congress. Although the results of the comparative effectiveness studies are not intended to mandate coverage policies for public or private payors, it is not clear what effect, if any, the research will have on the sales of our products. It is possible that comparative effectiveness research demonstrating benefits of a competitor’s product could adversely affect the sales of our products. If third-party payors do not consider our products to be cost-effective compared to other available therapies, they may not cover our products as a benefit under their plans or, if they do, the level of payment may not be sufficient to allow us to sell our products on a profitable basis.

The Patient Protection and Affordable Care Act, as amended by the Health Care and Education Affordability Reconciliation Act of 2010, which is referred to as the ACA, was enacted in March 2010 and is designed to expand coverage for the uninsured while at the same time containing overall health care costs. With regard to pharmaceutical products, among other things, the ACA is designed to expand and increase industry rebates for drugs covered under Medicaid programs, impose an annual fee on branded pharmaceutical manufacturers and make changes to the coverage requirements under the Medicare Part D program. In 2013, 2012 and 2011, our rebates associated with the Medicare Part D “donut hole” were $1.9 million, $1.8 million and $1.4 million, respectively. In 2013 and 2012, we recorded $10.4 million and $1.8 million, respectively, in sales, general and administrative expenses related to the branded prescription drug fee established pursuant to the ACA. We were not subject to this fee prior to 2012. The branded prescription drug fee is not tax deductible. We cannot predict all of the effects of the ACA on pharmaceutical companies as many of the ACA reforms require the promulgation of detailed regulations implementing the statutory provisions, which has not yet occurred.

In Europe and many other foreign countries, the success of KALYDECO, and any other drug candidates we may develop, depends largely on obtaining and maintaining government reimbursement, because in many foreign countries patients are unlikely to use prescription pharmaceutical products that are not reimbursed by their governments. Negotiating reimbursement rates in foreign countries can delay the commercialization of a pharmaceutical product and generally results in a reimbursement rate that is lower than the net price that companies can obtain for the same product in the United States.

In some countries, such as Germany and France, commercial sales of a product can begin while the reimbursement rate that a company will receive in future periods is under discussion. In other countries, a company must complete the reimbursement discussions prior to the commencement of commercial sales of the pharmaceutical product. The requirements governing drug pricing vary widely from country to country. For example, the European Union provides options for its member states to restrict the range of drugs for which their national health insurance systems provide reimbursement and to control the prices of drugs for human use. A member state may approve a specific price for the drug or it may instead adopt a system of direct or indirect controls on the profitability of the company placing the drug on the market. Recently, many countries in the European Union have increased the amount of discounts required on pharmaceuticals and these efforts could continue as countries attempt to manage healthcare expenditures, especially in light of the severe fiscal and debt crises experienced by many countries in the European Union. There can be no assurance that any country that has price controls or reimbursement limitations for pharmaceutical products will allow favorable reimbursement and pricing arrangements for any of our products.

Other United States Regulations

Pharmaceutical companies also are subject to various federal and state laws pertaining to health care “fraud and abuse,” including anti-kickback laws and false claims laws, and the reporting of payments to physicians and teaching hospitals.

Anti-kickback Laws

U.S. federal laws prohibit fraud and abuse involving state and federal health care programs, such as Medicare and Medicaid. These laws are interpreted broadly and enforced aggressively by various state and federal agencies, including the Centers for Medicare & Medicaid Services, or CMS, the Department of Justice, the Office of Inspector General for HHS and various state agencies. These anti-kickback laws prohibit, among other things, knowingly and willfully offering, paying, soliciting, receiving or providing remuneration, directly or indirectly, in exchange for or to induce either the referral of an individual, or the furnishing, arranging for or recommending of an item or service that is reimbursable, in whole or in part, by a federal health care program. Remuneration is broadly defined to include anything of value, such as, cash payments, gifts or gift certificates, discounts, or the furnishing of services, supplies or equipment. The anti-kickback laws are broad and prohibit many arrangements and practices that are lawful in businesses outside of the health care industry.

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The penalties for violating the anti-kickback laws can be severe. The sanctions include criminal and civil penalties, and possible exclusion from the federal health care programs. Many states have adopted laws similar to the federal anti-kickback laws, and some apply to items and services reimbursable by any payor, including third-party payors.

State and Federal Prohibitions on False Claims

The federal False Claims Act imposes liability on any person or entity that, among other things, knowingly presents, or causes to be presented, a false or fraudulent claim for payment to the federal government. Under the False Claims Act, a person acts knowingly if he has actual knowledge of the information or acts in deliberate ignorance or in reckless disregard of the truth or falsity of the information. Specific intent to defraud is not required. Provisions of the False Claims Act allow a private individual to bring an action on behalf of the federal government and to share in any amounts paid by the defendant to the government in connection with the action. The number of filings under these provisions has increased significantly in recent years. When an entity is determined to have violated the False Claims Act, it may be required to pay up to three times the actual damages sustained by the government, plus civil penalties for each false claim. Conduct that violates the False Claims Act may also lead to exclusion from the federal health care programs. Given the number of claims likely to be at issue, potential damages under the False Claims Act for even a single inappropriate arrangement could be significant. In addition, various states have enacted similar laws modeled after the False Claims Act that apply to items and services reimbursed under Medicaid and other state health care programs, and, in several states, such laws apply to claims submitted to all payors.

Federal Prohibitions on Health Care Fraud and False Statements Related to Health Care Matters

Under the administrative simplification provisions of the Health Insurance Portability and Accountability Act of 1996, or HIPAA, and state laws there are numerous regulations for protecting the privacy and security of protected health information. Additional administrative simplification provisions created the following federal crimes: health care fraud, false statements relating to health care matters, theft or embezzlement in connection with a health benefit program and obstruction of criminal investigation of health care offenses. The health care fraud statute prohibits knowingly and willfully executing a scheme to defraud any health care benefit program, including a private insurer. The false statements statute prohibits knowingly and willfully falsifying, concealing, or covering up a material fact or making any materially false, fictitious, or fraudulent statement in connection with the delivery of or payment for health care benefits, items, or services. The theft or embezzlement statute prohibits knowingly and willfully embezzling, stealing or otherwise converting or misapplying the money or property of a health care benefit program. The obstruction of criminal investigations of health care offenses statute prohibits willfully preventing, obstructing, misleading or delaying the communication of information and records relating to a violation of a federal health care offense to a criminal investigator. A violation of any of these laws is a felony and may result in fines, or exclusion from the federal health care programs.

Physician Payment Sunshine Act

The Physician Payment Sunshine Act will require pharmaceutical manufacturers to report annually to the Secretary of HHS payments or other transfers of value made by that entity to physicians and teaching hospitals. In February 2013, regulations were released that contain detailed guidance regarding the information that must be collected and reported. We were required to collect information regarding such payments starting in August 2013 and will be required to begin reporting such information in March 2014. Over the next several years, we will need to continue to dedicate significant resources to enhance our systems and processes in order to comply with these regulations. Failure to comply with the reporting requirements would result in significant civil monetary penalties. Similar laws have been enacted or are under consideration in foreign jurisdictions, including France which has adopted the Loi Bertrand, or French Sunshine Act, which became effective in 2013.

The Foreign Corrupt Practices Act

The Foreign Corrupt Practices Act prohibits U.S. companies and their representatives from offering, promising, authorizing or making payments to foreign officials for the purpose of obtaining or retaining business abroad. In many countries, the health care professionals we regularly interact with may meet the definition of a foreign government official for purposes of the Foreign Corrupt Practices Act.

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Other Regulations

In addition to the statutes and regulations described above, we also are subject to regulation in the United States under the Occupational Safety and Health Act, the Environmental Protection Act, the Toxic Substances Control Act, the Resource Conservation and Recovery Act and other federal, state, local and foreign statutes and regulations, now or hereafter in effect.

EMPLOYEES

As of December 31, 2013, we had approximately 1,800 employees, which was a decrease of 18% from approximately 2,200 on December 31, 2012. Of these employees, approximately 1,500 were based in the United States, approximately 200 were based in Europe and approximately 100 were based in Canada. Our scientific staff members have diversified experience and expertise in molecular and cell biology, biochemistry, synthetic organic chemistry, protein X-ray crystallography, protein nuclear magnetic resonance spectroscopy, microbiology, computational chemistry, biophysical chemistry, medicinal chemistry, clinical pharmacology and clinical medicine. Our clinical development personnel have extensive expertise in designing and executing clinical trials. Employees in our commercial organization have extensive experience in selling and marketing pharmaceutical products as well as seeking reimbursement from government and third-party payors for pharmaceutical products. Our employees are not covered by a collective bargaining agreement, except for a small number of employees in France and Spain. Science magazine named Vertex as one of its top employers in the life sciences in 2011, 2012 and 2013. We consider our relations with our employees to be good.

OTHER MATTERS

Financial Information and Significant Customers

Financial information about (i) our net product revenues and other revenues generated in the principal geographic regions in which we operate and our significant customers is set forth in Note X, "Segment Information," to our consolidated financial statements included in this Annual Report on Form 10-K, (ii) net income (loss) per share attributable to Vertex common shareholders and our total assets are provided in our consolidated financial statements included in this Annual Report on Form 10-K and (iii) our research and development expenses in each of the last three fiscal years and our deconsolidation of Alios as of December 31, 2013 is provided in Item 7, "Management's Discussion and Analysis of Financial Condition and Results of Operations." A discussion of the risks attendant to our international operations is set forth in the “Risk Factors” section of this Annual Report on Form 10-K.

Information Available on the Internet

Our internet address is www.vrtx.com. Our annual reports on Form 10-K, quarterly reports on Form 10-Q and current reports on Form 8-K, and all amendments to those reports, are available to you free of charge through the “Investors-SEC Filings” section of our website as soon as reasonably practicable after those materials have been electronically filed with, or furnished to, the Securities and Exchange Commission.

Corporate Information

Vertex was incorporated in Massachusetts in 1989, and our principal executive offices are located at 50 Northern Avenue Boston, Massachusetts 02210. We have research sites located in San Diego, California; Coralville, Iowa; Montreal, Canada and Milton Park, U.K. We also have an office in Washington, D.C. We have established our European headquarters in Switzerland and have offices in Australia, France, Germany, Ireland, Spain, the Netherlands and the United Kingdom.

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DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

The names, ages and positions held by our executive officers and directors are as follows:

Name	Age	Position
Jeffrey M. Leiden, M.D., Ph.D.	58	Chairman of the Board, Chief Executive Officer and President
Stuart A. Arbuckle	48	Executive Vice President and Chief Commercial Officer
Kenneth L. Horton, J.D.	47	Executive Vice President and Chief Legal Officer
Peter Mueller, Ph.D.	57	Executive Vice President, Global Research and Development, and Chief Scientific Officer
Ian F. Smith	48	Executive Vice President and Chief Financial Officer
Thomas Connolly	56	Senior Vice President, Human Resources
Megan Pace	41	Senior Vice President, Corporate Communications
Amit K. Sachdev, J.D.	46	Senior Vice President, Global Government Strategy, Market Access and Value
Paul M. Silva	48	Senior Vice President and Corporate Controller
David Altshuler, M.D., Ph.D.	49	Director
Joshua S. Boger, Ph.D.	62	Director
Terrence C. Kearney	59	Director
Yuchun Lee	48	Director
Margaret G. McGlynn	54	Director
Wayne J. Riley, M.D.	54	Director
Bruce I. Sachs	54	Director
Elaine S. Ullian	66	Director

Dr. Leiden is our Chairman, Chief Executive Officer and President. He has held the positions of Chief Executive Officer and President since February 2012 after joining us as CEO Designee in December 2011. He has been a member of our Board of Directors since July 2009, the Chairman of our Board of Directors since May 2012, and served as our lead independent director from October 2010 through December 2011. Dr. Leiden was a Managing Director at Clarus Ventures, a life sciences venture capital firm, from 2006 through January 2012. Dr. Leiden was President and Chief Operating Officer of Abbott Laboratories, Pharmaceuticals Products Group, and a member of the Board of Directors of Abbott Laboratories from 2001 to 2006. From 1987 to 2000, Dr. Leiden held several academic appointments, including the Rawson Professor of Medicine and Pathology and Chief of Cardiology and Director of the Cardiovascular Research Institute at the University of Chicago, the Elkan R. Blout Professor of Biological Sciences at the Harvard School of Public Health, and Professor of Medicine at Harvard Medical School. He is an elected member of both the American Academy of Arts and Sciences, and the Institute of Medicine of the National Academy of Sciences. Dr. Leiden is a senior advisor to Clarus Ventures. Dr. Leiden was a director and the non-executive Vice Chairman of the board of Shire plc, a specialty biopharmaceutical company, from 2006 to January 2012, and was also a member of the Board of Directors of Millennium Pharmaceuticals, Inc. from October 2007 until it was acquired in June 2008. Dr. Leiden received his M.D., Ph.D. and B.A. degrees from the University of Chicago.

Mr. Arbuckle is our Executive Vice President and Chief Commercial Officer, a position he has held since September 2012. Prior to joining us, Mr. Arbuckle held multiple commercial leadership roles at Amgen, Inc., a 17,000 person biotechnology company, from July 2004 through August 2012. Mr. Arbuckle has worked in the biopharmaceuticals industry since 1986, including more than 15 years at GlaxoSmithKline plc, where he held sales and marketing roles of increasing responsibility for medicines aimed at treating respiratory, metabolic, musculoskeletal, cardiovascular and other diseases. He currently is a member of the Board of Directors of the Cancer Support Community, an international non-profit organization dedicated to providing support, education and hope to people affected by cancer. Mr. Arbuckle holds a BSc in pharmacology and physiology from the University of Leeds.

Mr. Horton is our Executive Vice President and Chief Legal Officer, a position he has held since June 2012. Prior to joining us, Mr. Horton served as General Counsel and Executive Vice President of Corporate Development at Nordion Inc. (formerly MDS Inc.), a global health science company, from 2005 to 2011. He joined MDS from PerkinElmer, Inc., where he was Vice President, Acquisitions, Ventures and General Counsel for the Life and Analytical Sciences business unit. Mr.

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Horton began his legal career practicing corporate law at Ropes & Gray in Boston after working as a strategy consultant in the United States and Europe. Mr. Horton currently serves on the Board of Advisors for Beth Israel Deaconess-Needham Hospital and was formerly Chairman of Lumira Capital. Mr. Horton holds an A.B. from Dartmouth College, a J.D. from Harvard Law School and was awarded the D.A.A.D. Direktstipendium for study at the Universitaet Bonn.

Dr. Mueller is our Executive Vice President, Global Research and Development, a position he has held since May 2009, and has been our Chief Scientific Officer since July 2003. Dr. Mueller was our Executive Vice President, Drug Innovation and Realization, from February 2006 to May 2009, and our Senior Vice President, Drug Discovery and Innovation, from July 2003 to February 2006. Prior to joining us, Dr. Mueller was the Senior Vice President, Research and Development, of Boehringer Ingelheim Pharmaceuticals, Inc., with responsibility for the development of all drug candidates in the company’s portfolio in North America. He led research programs in the areas of immunology, inflammatory cardiovascular disease and gene therapy on a global basis. During his time with Boehringer Ingelheim, Dr. Mueller oversaw the discovery of numerous development candidates and held several positions in basic research, medicinal chemistry and management. Dr. Mueller received both an undergraduate degree and a Ph.D. in chemistry at the Albert Einstein University of Ulm, Germany, where he also holds a Professorship in Theoretic Organic Chemistry. He completed fellowships in quantum pharmacology at Oxford University and in biophysics at Rochester University.

Mr. Smith is our Executive Vice President and Chief Financial Officer, a position he has held since February 2006. From November 2003 to February 2006, he was our Senior Vice President and Chief Financial Officer, and from October 2001 to November 2003, he served as our Vice President and Chief Financial Officer. Prior to joining us, Mr. Smith served as a partner in the Life Science and Technology Practice Group of Ernst & Young LLP, an accounting firm, from 1999 to 2001. Mr. Smith initially joined Ernst & Young’s U.K. firm in 1987, and then joined its Boston office in 1995. Mr. Smith currently is a member of the Boards of Directors of Acorda Therapeutics, Inc., a drug development company, and Infinity Pharmaceuticals, Inc., a drug development company. Mr. Smith holds a B.A. in accounting and finance from Manchester Metropolitan University, U.K., is a member of the American Institute of Certified Public Accountants and is a Chartered Accountant of England and Wales.

Mr. Connolly is our Senior Vice President, Human Resources, a position he has held since August 2013. Mr. Connolly served as our Vice President, Human Resources from September 2012 through August 2013. From January 2009 to September 2012, Mr. Connolly was a Senior Vice President and the Chief Human Resources Officer at MF Global. Prior to MF Global, he held human resources leadership positions at UBS, Goldman Sachs, Citibank, Aetna and Lehman Brothers. He currently serves as a special advisor on human resources and other organizational matters to Save the Children, and serves on the Advisory Board of the Center for Innovation & Change Leadership at Suffolk University. Mr. Connolly holds a B.S. in Psychology from the University of Connecticut, an M.B.A. from Leonard N. Stern School of Business at New York University, an M.S. in Industrial/Organizational Psychology from Stevens Institute of Technology and an M.S. in Health Care Administration from the University of Phoenix.

Ms. Pace is our Senior Vice President, Corporate Communications, a position she has held since July 2012. Ms. Pace served as our Vice President, Corporate Communications from May 2010 through July 2012. Prior to joining us, Ms. Pace was a Senior Director at Genentech, Inc., a biotechnology company, from 2005 through April 2010, where she led the team responsible for public affairs, product public relations and patient advocacy. Prior to Genentech, she held government affairs and public relations roles at Eli Lilly & Company, and worked at Porter Novelli, a global public relations firm, where she managed disease awareness and public health campaigns for several biopharmaceutical companies and government agencies. Ms. Pace holds a B.A. from the College of Charleston.

Mr. Sachdev is our Senior Vice President, Global Government Strategy, Market Access and Value, a role he assumed in February 2013. As a Senior Vice President, he has led our government affairs, public policy and patient advocacy functions since he joined us in July 2007 and built and managed our Canadian business operations from October 2010 through February 2013. Mr. Sachdev served as Executive Vice President, Health of the Biotechnology Industry Organization (BIO) from April 2005 through June 2007. Mr. Sachdev was the Deputy Commissioner for Policy at the FDA from April 2004 through April 2005, and held several other senior positions within the FDA from September 2002 through April 2004. From 1998 to 2002, Mr. Sachdev served as Majority Counsel to the Committee on Energy and Commerce in the United States House of Representatives. From 1993 to 1997, Mr. Sachdev practiced law, first at the Chemical Manufacturers Association, and then with the law firm of Ropes & Gray. Mr. Sachdev holds a B.S from Carnegie Mellon University, and a J.D. from Emory University School of Law.

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Mr. Silva is our Senior Vice President and Corporate Controller, a position he has held since April 2011. Mr. Silva joined us in August 2007 as Senior Director, Accounting Operations and was our Vice President and Corporate Controller from September 2008 through April 2011. Prior to joining us, he was the Vice President, Internal Reporting at Iron Mountain Incorporated from July 2006 until August 2007 and a consultant to Iron Mountain’s financing department from April 2005 until July 2006. He was the Finance Director of the Bioscience Technologies Division of Thermo Electron Corporation from 2002 to April 2005. Mr. Silva holds a B.S. in accounting from Assumption College.

Dr. Altshuler has been a member of our Board of Directors since May 2012. Dr. Altshuler is the Director of the Program in Medical and Population Genetics at the Broad Institute of Harvard University and the Massachusetts Institute of Technology, a position he has held since 2003. He has served as the Institute's Deputy Director and Chief Academic Officer since 2009. He is one of four founding members of the Broad Institute, a research collaboration of Harvard, MIT, The Whitehead Institute and the Harvard Hospitals. Dr. Altshuler joined the faculty at Harvard Medical School and the Massachusetts General Hospital in 2000 and has held the academic rank of Professor of Genetics and Medicine since 2008. He has served as Adjunct Professor of Biology at MIT since 2012. Dr. Altshuler earned a B.S. from MIT, a Ph.D. from Harvard University and an M.D. from Harvard Medical School. Dr. Altshuler completed his clinical training in Internal Medicine, and in Endocrinology, Diabetes and Metabolism, at the Massachusetts General Hospital.

Dr. Boger is the founder of Vertex and has been a director since our inception in 1989. He was our Chief Executive Officer from 1992 through May 2009. He was our Chairman of the Board from 1997 until May 2006 and our President from our inception until December 2000, and from 2005 through February 2009. He was our Chief Scientific Officer from 1989 until May 1992. Prior to founding Vertex in 1989, Dr. Boger held the position of Senior Director of Basic Chemistry at Merck Sharp & Dohme Research Laboratories in Rahway, New Jersey, where he headed both the Department of Medicinal Chemistry of Immunology & Inflammation and the Department of Biophysical Chemistry. Dr. Boger holds a B.A. in chemistry and philosophy from Wesleyan University and M.S. and Ph.D. degrees in chemistry from Harvard University.

Mr. Kearney has been a member of our Board of Directors since May 2011. Mr. Kearney served as the Chief Operating Officer of Hospira, Inc., a specialty pharmaceutical and medication delivery company, from April 2006 to January 2011. From April 2004 to April 2006, he served as Hospira’s Senior Vice President, Finance, and Chief Financial Officer, and he served as Acting Chief Financial Officer through August 2006. Mr. Kearney served as Vice President and Treasurer of Abbott Laboratories from 2001 to April 2004. From 1996 to 2001, Mr. Kearney was Divisional Vice President and Controller for Abbott’s International Division. He received his B.S. in biology from the University of Illinois and his M.B.A. from the University of Denver.

Mr. Lee has been a member of our Board of Directors since September 2012. Mr. Lee has served as an Executive in Residence (XIR) and Partner of General Catalyst Partners, a venture capital firm, since April of 2013. Mr. Lee was the Vice President of IBM's Enterprise Marketing Management Group from November 2010 through January 2013. Mr. Lee co-founded Unica Corporation, a provider of software and services used to automate marketing processes, in 1992, and was Unica's President and/or Chief Executive Officer from 1992 through November 2010, when Unica was acquired by IBM. From 1989 to 1992, Mr. Lee was a senior consultant at Digital Equipment Corporation, a supplier of general computing technology and consulting services. Mr. Lee holds a B.S. and an M.S. in electrical engineering and computer science from the Massachusetts Institute of Technology and an M.B.A. from Babson College.

Ms. McGlynn has been a member of our Board of Directors since May 2011. Since July 2011, Ms. McGlynn has served as the President and Chief Executive Officer of the International AIDS Vaccine Initiative, a global not-for-profit organization whose mission is to ensure the development of safe, effective and accessible HIV vaccines for use throughout the world. Ms. McGlynn served as President, Vaccines and Infectious Diseases of Merck & Co., Inc. from 2005 until 2009. Ms. McGlynn joined Merck in 1983 and served in a variety of marketing, sales and managed care roles. Ms. McGlynn serves as a member of the Board of Directors for Air Products and Chemicals, Inc., a company specializing in gases and chemicals for industrial uses, and Amicus Therapeutics, Inc., a biopharmaceutical company. She is also a member of the National Industrial Advisory Committee at the University at Buffalo School of Pharmacy and Pharmaceutical Sciences. Ms. McGlynn holds a B.S. in Pharmacy and an M.B.A. in Marketing from the State University of New York at Buffalo.

Dr. Riley has been a member of our Board of Directors since July 2010. Dr. Riley is Clinical Professor of Medicine, Vanderbilt University School of Medicine and Adjunct Professor of Healthcare Management, Owen Graduate School of Management at Vanderbilt University. From January 2007 until July 2013, Dr. Riley was President and Chief Executive Officer of Meharry Medical College. At Meharry he held the rank of tenured Professor of Internal Medicine and was a Senior Health Policy Associate at the Robert Wood Johnson Center for Health Policy at Meharry. From May 2004 to

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December 2006, Dr. Riley served as a corporate officer and member of the executive management team as Vice President and Vice Dean for Health Affairs and Governmental Relations and Associate Professor of Medicine at Baylor College of Medicine, and Assistant Chief of Medicine at Ben Taub General Hospital. Dr. Riley is a member of the Board of Directors of HCA Holdings, Inc., the parent company of Hospital Corporation of America, a leading operator of hospitals and health facilities, where he serves on the Audit & Compliance Committee and the Nominating and Corporate Governance Committee and is the Chair of the Patient Safety and Quality Committee. Dr. Riley formerly served as a Director of Pinnacle Financial Partners and of the Nashville Branch Board of the Federal Reserve Bank of Atlanta. Dr. Riley earned a B.A. from Yale University, an M.P.H. in health systems management from Tulane University School of Public Health & Tropical Medicine, an M.D. from the Morehouse School of Medicine and an M.B.A. from Rice University's Jones Graduate School of Management.

Mr. Sachs has been a member of our Board of Directors since 1998. He is a General Partner at Charles River Ventures, a venture capital firm he joined in 1999. From 1998 to 1999, he served as Executive Vice President and General Manager of Ascend Communications, Inc. From 1997 until 1998, Mr. Sachs served as President and Chief Executive Officer of Stratus Computer, Inc. From 1995 to 1997, he served as Executive Vice President and General Manager of the Internet Telecom Business Group at Bay Networks, Inc. From 1993 to 1995, he served as President and Chief Executive Officer at Xylogics, Inc. Mr. Sachs was a director of BigBand Networks, Inc., a network-based platform company, from 2005 through June 2009. Mr. Sachs holds a B.S.E.E. in electrical engineering from Bucknell University, an M.E.E. in electrical engineering from Cornell University, and an M.B.A. from Northeastern University.

Ms. Ullian has been a member of our Board of Directors since 1997. From 1996 through January 2010, she served as President and Chief Executive Officer of Boston Medical Center, a private, not-for-profit, 626-bed, academic medical center with a community-based focus. From 1994 to 1996, she served as President and Chief Executive Officer of Boston University Medical Center Hospital. From 1987 to 1994, Ms. Ullian served as President and Chief Executive Officer of Faulkner Hospital. She also serves as a director of Thermo Fisher Scientific Inc. and Hologic, Inc. Ms. Ullian holds a B.A. in political science from Tufts University and an M.P.H. from the University of Michigan.

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ITEM 1A. RISK FACTORS

RISK FACTORS

Investing in our common stock involves a high degree of risk, and you should carefully consider the risks and uncertainties described below in addition to the other information included or incorporated by reference in this Annual Report on Form 10-K. If any of the following risks or uncertainties actually occurs, our business, financial condition or results of operations would likely suffer, possibly materially. In that case, the trading price of our common stock could decline.

Risks Related to Our Business

We are investing significant resources in our development program for lumacaftor (VX-809) in combination with ivacaftor and, if the results of clinical trials of this combination therapy, the anticipated or actual timing of marketing approvals for this combination therapy, or the market acceptance of this combination therapy, if approved, including treatment reimbursement levels agreed to by third-party payors, are unfavorable or do not meet the expectations of investors or public market analysts, our business will be materially harmed and the market price of our common stock would likely decline.

We are investing significant resources in our development program for lumacaftor in combination with ivacaftor as a potential treatment for patients with CF who have two copies (homozygous) of the F508del mutation in their CFTR gene. In February 2013, we initiated the Phase 3 clinical development program for lumacaftor in combination with ivacaftor. We initiated this program based primarily on data from a Phase 2 clinical trial in which a relatively small number of patients received lumacaftor as a monotherapy for 28 days, followed by lumacaftor in combination with ivacaftor for 28 days. The pattern of lung function response observed in both Cohort 2 and Cohort 3 of our Phase 2 clinical trial was similar, with a decline in FEV₁ during the lumacaftor monotherapy dosing period followed by a statistically significant increase in FEV₁ during the lumacaftor and ivacaftor combination dosing period. In addition, the increase in FEV₁ observed in our Phase 2 clinical trial of lumacaftor in combination with ivacaftor was less than the increase in FEV₁ observed in comparable Phase 2 clinical trials of ivacaftor in patients with CF who have one copy of the G551D mutation in their CFTR gene.

We have enrolled approximately 550 patients with CF who are homozygous for the F508del mutation in each of the two Phase 3 clinical trials evaluating lumacaftor in combination with ivacaftor, which are referred to as TRAFFIC and TRANSPORT, for a total of approximately 1,100 patients. We expect that we will obtain data from this Phase 3 clinical development program in mid-2014. In TRAFFIC and TRANSPORT, lumacaftor is being evaluated in combination with ivacaftor over a significantly longer dosing period of 24 weeks and without the monotherapy lead-in period that was part of the Phase 2 clinical trial. In order to obtain approval for lumacaftor in combination with ivacaftor, we will need to show that lumacaftor in combination with ivacaftor is safe and effective in a significantly larger number of patients than were involved in the Phase 2 clinical trial, over the significantly longer 24-week combination dosing period.

If the data from our ongoing clinical trials or non-clinical studies of lumacaftor in combination with ivacaftor regarding the safety or efficacy of this combination are not favorable, the FDA and comparable foreign regulatory authorities may not approve this combination regimen and/or we may be forced to delay or terminate the development of this combination regimen, which would materially harm our business. Further, even if we gain marketing approvals for this combination therapy from the FDA and comparable foreign regulatory authorities in a timely manner, we cannot be sure that this combination therapy will be commercially successful. If the results of TRAFFIC and TRANSPORT, the anticipated or actual timing of marketing approvals for this combination therapy, or the market acceptance of this combination therapy, if approved, including treatment reimbursement levels agreed to by third-party payors, do not meet the expectations of investors or public market analysts, the market price of our common stock would likely decline.

We expect to incur future losses, and we may not become profitable in future periods.

Over the past three years a majority of our revenues have been due to sales of INCIVEK. As a result of declines in INCIVEK revenues, we expect to incur a significant operating loss in 2014 and expect to continue to incur operating losses until we are able to substantially increase product revenues from the sale of therapies for the treatment of CF. There can be no assurance that we will be successful in expanding the label for ivacaftor or obtaining approval for lumacaftor in combination with ivacaftor. Our net losses will have an adverse effect on, among other things, our shareholders' equity, total assets and working capital. We expect that losses will fluctuate from quarter to quarter and year to year, and that such fluctuations may be substantial. We cannot predict when we will become profitable, if ever.

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Our future revenues from KALYDECO are dependent, among other factors, on the outcomes of reimbursement discussions in international markets, our ongoing clinical trials and discussions with regulatory authorities regarding the potential for ivacaftor as a treatment for additional patient populations.

In 2012, we obtained approval to market KALYDECO (ivacaftor) for the treatment of patients with CF six years of age and older with the G551D mutation in the CFTR gene. Since its approval in the first quarter of 2012, most patients six years of age and older in the United States and Europe who have the G551D mutation in theCFTRgene have started treatment with KALYDECO.We are in discussions with relevant agencies in Australia and Canada regarding public reimbursement for the cost of KALYDECO for patients with CF six years of age and older in these countries who have the G551D mutation in their CFTR gene. There can be no assurance that we will be able to obtain, or obtain on a timely basis, appropriate reimbursement for KALYDECO in these international markets.

In order to expand the market for ivacaftor, we need to demonstrate that ivacaftor is safe and effective in additional patient populations. We submitted an sNDA to the FDA and an MAA variation in the European Union in September 2013 and October 2013, respectively, seeking approval to market ivacaftor for the treatment of patients with CF six years of age and older who have specified other mutations in their CFTR gene. These submissions incorporated clinical data from our first ivacaftor label-expansion Phase 3 clinical trial. In December 2013, we announced data from a Phase 3 clinical trial evaluating ivacaftor as a potential treatment for patients with CF who have the R117H mutation in their CFTR gene. This clinical trial did not meet its primary endpoint. However, we believe that a pre-specified subgroup analysis demonstrated a clinical benefit for patients 18 years of age and older with CF who have the R117H mutation on at least one allele. We plan to meet with the FDA in early 2014 to discuss these results and the potential submission of an sNDA for patients with CF who have the R117H mutation on at least one allele. We also are conducting a Phase 3 clinical trial to evaluate ivacaftor as a potential treatment for patients two to five years of age with CF who have specific mutations in their CFTR gene and a Phase 2 clinical trial to evaluate ivacaftor in patients with CF who have residual CFTR function.

These clinical trials and our discussions with regulatory authorities are subject to the same risks and uncertainties that are described in these risk factors with respect to the development of our drug candidates. There can be no assurance that the results from our clinical trials of ivacaftor or the data included in our submissions to regulatory authorities will be sufficient to obtain approval for use of ivacaftor in patients with other mutations in their CFTR gene or in any children two to five years of age with CF.

If our competitors bring drugs with superior product profiles to market, our drugs may not be competitive and our revenues could decline.

KALYDECO and any drugs we develop in the future may not be able to compete effectively with marketed drugs or new drugs that may be developed by competitors. There are many other companies developing drugs for the same indications that we are pursuing. In order to compete successfully in these areas, we must demonstrate improved safety, efficacy and/or tolerability, and ease of manufacturing, and gain and maintain market acceptance over competing drugs. Many of our competitors, including major pharmaceutical companies such as Abbvie, Bristol-Myers Squibb, Gilead, Johnson & Johnson, Merck, Novartis, Pfizer, Sanofi and Roche, possess substantially greater financial, technical and human resources than we possess.

A number of companies are seeking to identify and develop drug candidates for the treatment of CF, including Novartis, Pfizer, Genzyme, which is a division of Sanofi, and several private companies. Our competitors have research and development programs directed at identifying CFTR potentiators, CFTR correctors and drug candidates with other mechanisms of action that seek to address the underlying cause of CF, and our success in rapidly developing and commercializing KALYDECO may increase the resources that our competitors allocate to the development of these potential treatments for CF. While we do not believe that any of these competitive programs have entered late-stage clinical development, if one or more competing therapies are successfully developed as a treatment for patients with CF, our revenues from KALYDECO and/or other compounds, if then approved, could face competitive pressures.

We are aware of a number of companies that are developing new treatments for HCV infection, including HCV nucleotide analogues, HCV protease inhibitors, non-nucleoside HCV polymerase inhibitors and HCV NS5A inhibitors. We expect that over the next several years several all-oral treatment treatment regimens for HCV infection will be approved in the United States and elsewhere in the world. Due in part to these competitive factors, two drug candidates, VX-135 and VX-222, that we were developing as treatments for HCV infection became impaired in 2013 resulting in aggregate intangible asset impairment charges of $663.5 million. The commercial prospects for VX-135, if approved, will depend on, among

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other factors, the efficacy, safety, tolerability and other characteristics of any combination therapy including VX-135 relative to existing and future treatments for HCV infection, and the clinical data obtained and timing of marketing approvals for drug candidates being developed by our competitors. If we develop an all-oral treatment regimen that includes VX-135, we expect that our all-oral treatment regimen would compete directly with several all-oral treatment regimens that were approved several years prior to the approval of any all-oral treatment regimen that includes VX-135.

If we discover safety issues with any of our products or if we fail to comply with continuing U.S. and applicable foreign regulations, commercialization efforts for the product could be negatively affected, the approved product could lose its approval or sales could be suspended, and our business could be materially harmed.

Our products are subject to continuing regulatory oversight, including the review of additional safety information. Drugs are more widely used by patients once approval has been obtained and therefore side-effects and other problems may be observed after approval that were not seen or anticipated, or were not as prevalent or severe, during pre-approval clinical trials or nonclinical studies. For example, in December 2012, we updated the INCIVEK label in the United States to include a Boxed Warning stating that fatal and non-fatal serious skin reactions have been reported in patients taking INCIVEK combination treatment. The subsequent discovery of previously unknown problems with a product could negatively affect commercial sales of the product, result in restrictions on the product or lead to the withdrawal of the product from the market. The reporting of adverse safety events involving our products or public speculation about such events could cause our stock price to decline or experience periods of volatility.

If we or our collaborators fail to comply with applicable continuing regulatory requirements, we or our collaborators may be subject to fines, suspension or withdrawal of regulatory approvals for specific products, product recalls and seizures, operating restrictions and/or criminal prosecutions. In addition, the manufacturers we engage to make our products and the manufacturing facilities in which our products are made are subject to periodic review and inspection by the FDA and foreign regulatory authorities. If problems are identified during the review or inspection of these manufacturers or manufacturing facilities, it could result in our inability to use the facility to make our product or a determination that inventories are not safe for commercial sale.

If physicians, patients and third-party payors do not accept our drugs, we may be unable to generate significant revenues in future periods.

Our drugs may not gain or maintain market acceptance among physicians and patients. Effectively marketing our products and any of our drug candidates, if approved, requires substantial efforts, both prior to launch and after approval. Physicians may elect not to prescribe our drugs, and patients may elect not to request or take them, for a variety of reasons including:

• lower demonstrated efficacy, safety and/or tolerability compared to other drugs;

• prevalence and severity of adverse side-effects;

• lack of cost-effectiveness;

• lack of reimbursement availability from third-party payors;

• a decision to wait for the approval of other therapies in development that have significant perceived advantages over our drug;

• convenience and ease of administration;

• other potential advantages of alternative treatment methods; and

• ineffective marketing and/or distribution support.

If our drugs fail to achieve or maintain market acceptance, we will not be able to generate significant revenues in future periods.

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Government and other third-party payors seek to contain costs of health care through legislative and other means. If they fail to provide coverage and adequate reimbursement rates for our products, our revenues will be harmed.

In both domestic and foreign markets, our sales of products depend in part upon the availability of reimbursement from third-party payors. Third-party payors include government health programs such as Medicare and Medicaid in the United States and the national health care systems in many international markets, managed care providers, private health insurers and other organizations. Governments and other third-party payors seek to contain or reduce the costs of health care through various means, and in certain foreign markets, pricing or profitability of therapeutic and other pharmaceutical products is subject to governmental control. For example, KALYDECO has been approved in Australia and Canada, but we are still in discussions with relevant agencies regarding public reimbursement for the cost of KALYDECO in these countries. In the United States, there have been, and we expect that there will continue to be, a number of federal and state proposals to implement similar governmental control. The ACA requires discounts under the Medicare drug benefit program and increases the rebates paid by pharmaceutical companies on drugs covered by Medicaid. The ACA also imposes an annual fee, which increases annually, on sales by branded pharmaceutical manufacturers.

In addition, third-party payors attempt to contain health care costs by demanding price discounts or rebates and limiting both the types and variety of drugs that they will cover and the amounts that they will pay for drugs. As a result, they may not cover or provide adequate payment for our products. We might need to conduct post-marketing studies in order to demonstrate the cost-effectiveness of our products or any other future products to such payors’ satisfaction. Such studies might require us to commit a significant amount of management’s time and our financial and other resources. Our products might not ultimately be considered cost-effective. Adequate third-party reimbursement might not be available to enable us to maintain price levels sufficient to realize an appropriate return on our investment in product development.

Reimbursement rates vary according to the use of the drug and the clinical setting in which it is used, may be based on payments allowed for lower-cost products that already are reimbursed, may be incorporated into existing payments for other products or services and may reflect budgetary constraints and/or imperfections in the data used to calculate these rates. Net prices for products are reduced by mandatory discounts or rebates required by government health care programs and privately-negotiated discounts. While we have implemented policies in an effort to comply with mandated reimbursement rates, the U.S. federal government, state governments and private payors frequently pursue actions against pharmaceutical and biotechnology companies alleging that the companies have overstated prices in order to inflate reimbursement rates. Any such action could adversely affect the pricing of and revenues from our products.

Specialty pharmaceuticals are drugs that are prescribed by specialist physicians to treat rare or life-threatening conditions and typically address smaller patient populations. Each of our products is a specialty pharmaceutical product, and our research and development programs are focused on developing additional specialty pharmaceutical products. The increasing availability and use of innovative specialty pharmaceuticals, combined with their relative higher cost as compared to other types of pharmaceutical products, is beginning to generate significant third-party payor interest in developing cost-containment strategies targeted to this sector. The increasing use of health technology assessments in markets around the world and the financial challenges faced by many governments may lead to significant adverse effects on our business.

Any legislation or regulatory changes or relaxation of laws that restrict imports of drugs from other countries also could reduce the net price we receive for our products.

If we market any of our products in a manner that violates federal or state health care laws, including fraud and abuse laws, laws prohibiting off-label promotion, disclosure laws or other similar laws, we may be subject to civil or criminal penalties.

We are subject to health care fraud and abuse laws, such as the federal False Claims Act and the anti-kickback provisions of the federal Social Security Act, laws prohibiting off-label product promotion and other similar state and federal laws and regulations. While we have a corporate compliance program designed to actively identify, prevent and mitigate risk through the implementation of compliance policies and systems and the promotion of a culture of compliance, if we are found not to be in full compliance with these laws our business could be materially harmed.

The federal anti-kickback law prohibits knowingly and willfully offering, paying, soliciting, receiving or providing remuneration, directly or indirectly, in exchange for or to induce either the referral of an individual, or the ordering, furnishing, arranging for or recommending of an item or service that is reimbursable, in whole or in part, by a federal health care program, such as Medicare or Medicaid. The federal statute has been interpreted to apply to arrangements between

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pharmaceutical manufacturers on the one hand and prescribers, patients, purchasers and formulary managers on the other hand, and therefore constrains our marketing practices and our various service arrangements with physicians, including physicians who make clinical decisions to use our products. Although there are a number of statutory exemptions and regulatory safe harbors protecting certain common activities from prosecution, the exemptions and safe harbors are drawn narrowly, and practices that involve remuneration intended to induce prescribing, purchasing or recommending may be subject to scrutiny or penalty if they do not qualify for an exemption or safe harbor.

Federal false claims laws prohibit any person from knowingly presenting, or causing to be presented, a false claim for payment to the federal government, or knowingly making, or causing to be made, a false statement to get a false claim paid. Pharmaceutical companies have been prosecuted under these laws for a variety of alleged promotional and marketing activities, such as providing free product to customers with the expectation that the customers would bill federal programs for the product; reporting to pricing services inflated average wholesale prices that were then used by federal programs to set reimbursement rates; engaging in promotion for uses that the FDA has not approved, known as “off-label” uses, that caused claims to be submitted to Medicaid for non-covered off-label uses; and submitting inflated “best price” information to the Medicaid Rebate Program.

Although physicians are permitted, based on their medical judgment, to prescribe products for indications other than those approved by the FDA, manufacturers are prohibited from promoting their products for such off-label uses. We market KALYDECO for patients six years of age and older with CF who have the G551D mutation in their CFTR gene and INCIVEK for adults with genotype 1 HCV infection and provide promotional materials and training programs to physicians regarding the use of KALYDECO and INCIVEK in these patient populations. If the FDA determines that our promotional materials, training or other activities constitute off-label promotion, it could request that we modify our training or promotional materials or other activities or subject us to regulatory enforcement actions, including the issuance of a warning letter, injunction, seizure, civil fine and criminal penalties. It also is possible that other federal, state or foreign enforcement authorities might take action if they believe that the alleged improper promotion led to the submission and payment of claims for an off-label use, which could result in significant fines or penalties under other statutory authorities, such as laws prohibiting false claims for reimbursement. Even if it is later determined we were not in violation of these laws, we may be faced with negative publicity, incur significant expenses defending our actions and have to divert significant management resources from other matters.

Also applicable to some of our practices is HIPAA and its implementing regulations, which created federal criminal laws that prohibit executing a scheme to defraud any health care benefit program or making false statements relating to health care matters and which also imposes certain regulatory and contractual requirements regarding the privacy, security and transmission of individually identifiable health information.

The majority of states also have statutes or regulations similar to the federal anti-kickback law and false claims laws, which apply to items and services reimbursed under Medicaid and other state programs, or, in several states, apply regardless of the payor. In addition, certain states have laws governing the privacy of certain health information, which may differ from each other in significant ways and often are not preempted by HIPAA, complicating compliance efforts. Sanctions under these federal and state laws may include civil monetary penalties, exclusion of a pharmaceutical manufacturer’s products from reimbursement under government programs and criminal fines. Even if we are not determined to have violated these laws, government investigations into these issues typically require the expenditure of significant resources and generate negative publicity, which could harm our business.

In recent years, several states and localities have enacted legislation requiring pharmaceutical companies to establish marketing compliance programs, file periodic reports with the state or make periodic public disclosures on sales, marketing, pricing, clinical trials, health care provider payments and other activities. Additionally, as part of the ACA, the federal government recently enacted the Physician Payment Sunshine Act provisions. The Physician Payment Sunshine Act provisions require pharmaceutical manufacturers to report annually to the Secretary of HHS payments or other transfers of value made by that entity to physicians and teaching hospitals. In February 2013, regulations were released that contain detailed guidance regarding the information that must be collected and reported. We were required to begin collecting information regarding such payments starting in August 2013 and will be required to begin reporting such information in March 2014. We are dedicating significant resources to enhance our systems and processes in order to comply with these regulations. Failure to comply with the reporting requirements would result in significant civil monetary penalties. The ACA also includes various provisions designed to strengthen significantly fraud and abuse enforcement, such as increased funding for enforcement efforts and the lowering of the intent requirement of the federal anti-kickback statute and criminal health

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care fraud statute such that a person or entity no longer needs to have actual knowledge of this statute or specific intent to violate it.

If our past or present operations are found to be in violation of any such laws or any other governmental regulations that may apply to us, we may be subject to penalties, including civil and criminal penalties, damages, fines, exclusion from federal health care programs and/or the curtailment or restructuring of our operations. The risk of our being found in violation of these laws is increased by the fact that many of them have not been fully interpreted by the regulatory authorities or the courts, and their provisions are subject to a variety of interpretations. Any action against us for violation of these laws, even if we successfully defend against them, could cause us to incur significant legal expenses and divert our management’s attention from the operation of our business.

The sales and marketing practices of our industry have been the subject of increased scrutiny from federal and state government agencies, and we believe that this trend will continue. We have in place policies to govern how we may retain health care professionals as consultants that reflect the current climate on this issue and are providing training on these policies. Any action against us for violation of these laws, even if we successfully defend against them, also could cause us to incur significant legal expenses and divert our management’s attention from the operation of our business.

Changes in health care systems could hinder or prevent commercial success of our products and drug candidates.

The United States federal government and other governments are pursuing various changes in the health care system. Any government-adopted measures could adversely affect the pricing of health care products, including our approved products and/or any future drug candidates approved for sale. The continuing efforts of governments, insurance companies, managed care organizations and other payors for health care products to contain or reduce health care costs may adversely affect our ability to set prices we believe are fair for our products or any drugs we may develop and commercialize.

New laws, regulations and judicial decisions, or new interpretations of existing laws, regulations and decisions, relating to health care availability, methods of delivery or payment for drugs, or sales, marketing or pricing, may limit our potential revenues, and we may need to revise our research and development or commercialization programs. The pricing and reimbursement environment may change in the future and become more challenging for any of several reasons, including policies advanced by the U.S. government or foreign governments, new health care legislation or fiscal challenges faced by government health administration authorities. Specifically, in the United States and some foreign jurisdictions, there have been a number of legislative and regulatory proposals and initiatives to change the health care system in ways that could affect our ability to sell products. Some of these proposed and implemented reforms have resulted, or could result, in reduced reimbursement rates for our current or future products, which would adversely affect our business, operations and financial results. The ACA has far-reaching consequences for biopharmaceutical companies like us. As a result of this legislation, substantial changes are being made to the current system for paying for health care in the United States, including changes made in order to extend medical benefits to those who would otherwise lack health insurance coverage. If reimbursement for our products is substantially less than we expect in the future, or rebate obligations associated with them are substantially increased, our business could be materially and adversely affected.

Further federal and state proposals and health care reforms in and outside of the United States could limit the prices that can be charged for our products and may further limit our commercial opportunity. Our results of operations could be materially adversely affected by the ACA, by the Medicare prescription drug coverage legislation, by the possible effect of such current or future legislation on amounts that private insurers will pay and by other health care reforms that may be enacted or adopted in the future.

Risks Related to Development, Clinical Testing and Regulation of Our Products and Drug Candidates

Our drug candidates remain subject to clinical testing and regulatory approval. If we are unable to successfully develop additional drug candidates, our business will be materially harmed.

Our business depends upon the successful development and commercialization of additional drug candidates. These drug candidates are in various stages of development and must satisfy rigorous standards of safety and efficacy before they can be approved for sale by the FDA or comparable foreign regulatory authorities. To satisfy these standards, we must allocate resources among our various development programs and must engage in expensive and lengthy testing of our drug candidates. Discovery and development efforts for new pharmaceutical products, including new combination therapies, are resource-intensive and may take 10 to 15 years or longer for each drug candidate. Despite our efforts, our drug candidates may not:

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• offer therapeutic or other improvement over existing competitive drugs;

• be proven safe and effective in clinical trials;

• meet applicable regulatory standards;

• be capable of being produced in commercial quantities at acceptable costs; or

• if approved for commercial sale, be successfully marketed as pharmaceutical products.

We have ongoing or planned clinical trials for ivacaftor, ivacaftor in combination with lumacaftor and ivacaftor in combination with VX-661. The strength of our company’s product portfolio and pipeline will depend in large part upon the outcomes of these clinical trials and our ability to develop combination treatments for CF that include ivacaftor in combination with (i) lumacaftor or VX-661 and/or (ii) a next-generation CFTR corrector compound. Results of our clinical trials and findings from our nonclinical studies, including toxicology findings in nonclinical studies conducted concurrently with clinical trials, could lead to abrupt changes in our development activities, including the possible cessation of development activities associated with a particular drug candidate or program. Furthermore, results from our clinical trials may not meet the level of statistical significance required by the FDA or other regulatory authorities for approval of a drug candidate.

Many companies in the pharmaceutical and biotechnology industries, including us, have suffered significant setbacks in later-stage clinical trials even after achieving promising results in earlier-stage clinical trials. Accordingly, the results from completed preclinical studies and clinical trials may not be replicated in later clinical trials, and ongoing clinical trials for our drug candidates may not be predictive of the results we may obtain in later-stage clinical trials or of the likelihood of approval of a drug candidate for commercial sale. In addition, from time to time we report interim data from our clinical trials. Interim data from a clinical trial may not be predictive of final results from the clinical trial.

We are planning to develop co-formulated lumacaftor/ivacaftor using a continuous manufacturing process, and any failure to establish and validate our manufacturing process could adversely affect our ability to obtain approval for and launch lumacaftor in combination with ivacaftor.

We are planning to use a continuous manufacturing process to manufacture co-formulated lumacaftor/ivacaftor tablets. Continuous process manufacturing connects the processes used in traditional batch manufacturing and uses on-line monitoring in order to increase control of the manufacturing process. We have not previously designed, implemented or utilized a continuous manufacturing process to produce commercial quantities of a pharmaceutical product and believe that we would be the first company to seek approval for an NDA or an MAA using this method of manufacturing. As a result, there is a risk that we will encounter technical difficulties in the design, implementation or use of our continuous manufacturing process for the manufacture of co-formulated lumacaftor/ivacaftor that we will not be able to overcome, or overcome in a timely manner. In addition, it may be more difficult to satisfy regulators that our process is capable of consistently producing commercial quantities of co-formulated lumacaftor/ivacaftor and that our methods for testing the quality, purity and potency of the final products are sufficient. We also initially plan to primarily rely on a single validated third-party source to produce lumacaftor in combination with ivacaftor, and to use the new manufacturing facility we are establishing as a secondary source. Our continuous manufacturing process will be subject to inspections by or under the authority of the FDA and by or under the authority of other federal, state and foreign regulatory authorities. Any failure to establish and validate our continuous manufacturing process for co-formulated lumacaftor/ivacaftor or any disruption in our supply chain could increase costs or adversely affect our ability to launch lumacaftor in combination with ivacaftor in a timely manner. In addition, there can be no assurance that if we fail, or encounter delays with respect to our continuous manufacturing process of lumacaftor/ivacaftor, that we will be able to establish and validate, or establish and validate in a timely manner, a non-continuous manufacturing process to manufacture lumacaftor/ivacaftor.

If we are unable to obtain regulatory approval, we will be unable to commercialize our drug candidates.

Our drug candidates are subject to extensive governmental regulations relating to their development, clinical evaluation, manufacturing and commercialization. Rigorous nonclinical testing and clinical trials and an extensive regulatory approval process are required in the United States and in most other countries prior to the commercial sale of drug candidates. Satisfaction of these and other regulatory requirements is costly, time-consuming, uncertain and subject to unanticipated delays. It is possible that none of the drug candidates we are developing will be approved for marketing.

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The time required to complete clinical trials and to satisfy the FDA and other countries’ regulatory review processes is uncertain and typically takes many years. Our analysis of data obtained from nonclinical and clinical activities is subject to confirmation and interpretation by regulatory authorities, which could delay, limit or prevent regulatory approval. We also may encounter unanticipated delays or increased costs due to government regulation from future legislation or administrative action or changes in governmental policy during the period of drug development, clinical trials and governmental regulatory review.

Any failure to obtain regulatory approvals for a drug candidate would prevent us from commercializing that drug candidate. Any delay in obtaining required regulatory approvals could materially adversely affect our ability to successfully commercialize a drug candidate. Furthermore, any regulatory approval to market a drug may be subject to limitations that we do not expect on the indicated uses for which we may market the drug. Any such limitations could reduce the size of the market for the drug.

We also are subject to numerous foreign regulatory requirements governing the conduct of clinical trials, manufacturing and marketing authorization, pricing and third-party reimbursement. Foreign jurisdictions have different approval procedures than those required by the FDA, and these jurisdictions may impose additional testing requirements for our drug candidates. The foreign regulatory approval process includes all of the risks associated with the FDA approval process described above, as well as risks attributable to the satisfaction of foreign requirements. Approval by the FDA does not ensure approval by regulatory authorities outside the United States and approval by a foreign regulatory authority does not ensure approval by the FDA. In addition, the FDA may not favorably consider data from clinical trials conducted in foreign jurisdictions.

If clinical trials are prolonged or delayed, our development timelines for the affected development program could be extended, our costs to develop the drug candidate could increase and the competitive position of the drug candidate could be adversely affected.

We cannot predict whether or not we will encounter problems with any of our completed, ongoing or planned clinical trials that will cause us or regulatory authorities to delay or suspend clinical trials, or delay the analysis of data from our completed or ongoing clinical trials. Any of the following could delay our development programs:

• ongoing discussions with the FDA or comparable foreign authorities regarding the scope or design of our clinical trials and the number of clinical trials we must conduct;

• delays in enrolling volunteers or patients into clinical trials, including as a result of low numbers of patients that meet the eligibility criteria for the trial;

• a lower than anticipated retention rate of volunteers or patients in clinical trials;

• the need to repeat clinical trials as a result of inconclusive results, unforeseen complications in testing or clinical investigator error;

• inadequate supply or deficient quality of drug candidate materials or other materials necessary for the conduct of our clinical trials;

• unfavorable FDA or foreign regulatory authority inspection and review of a manufacturing facility that supplied clinical trial materials or its relevant manufacturing records or a clinical trial site or records of any clinical or preclinical investigation;

• unfavorable scientific results from clinical trials;

• serious and unexpected drug-related side-effects experienced by participants in our clinical trials or by participants in clinical trials being conducted by our competitors to evaluate drug candidates with similar mechanisms of action or structures to drug candidates that we are developing;

• favorable results in testing of our competitors’ drug candidates, or FDA or foreign regulatory authority approval of our competitors’ drug candidates; or

• action by the FDA or a foreign regulatory authority to place a clinical hold or partial clinical hold on a trial or compound.

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Our ability to enroll patients in our clinical trials in sufficient numbers and on a timely basis is subject to a number of factors, including the size of the patient population, the nature of the protocol, the proximity of patients to clinical sites, the availability of effective treatments for the relevant disease, the number of other clinical trials ongoing and competing for patients in the same indication and the eligibility criteria for the clinical trial. In addition, patients may drop out of our clinical trials or may be lost to follow-up medical evaluation after treatment ends, and this could impair the validity or statistical significance of the trials. Delays in patient enrollment or unforeseen drop-out rates may result in increased costs and longer development times.

We, our collaborators, the FDA or other applicable regulatory authorities may suspend clinical trials of a drug candidate at any time if we or they believe the healthy volunteers or patients participating in such clinical trials are being exposed to unacceptable health risks or for other reasons. Any such suspension could materially adversely affect the development of a particular drug candidate and our business.

In July 2013, the FDA placed our U.S. clinical trial evaluating VX-135, a drug candidate for the treatment of HCV infection, on partial clinical hold, and our business may be adversely affected if we cannot develop VX-135.

We have a collaboration for the development of our HCV nucleotide analogue VX-135 as a potential treatment for HCV infection. In July 2013, the FDA placed a partial clinical hold on our ongoing Phase 2 clinical trial in the United States of VX-135 in combination with RBV in patients with genotype 1 HCV infection following observation of reversible elevated liver enzymes in patients who received 400 mg of VX-135 in combination with RBV in a Phase 2 clinical trial in Europe. Until the partial clinical hold has been resolved, we cannot pursue further evaluation of VX-135 in the United States. There is no assurance that the FDA will lift the partial clinical hold or that we will be able to successfully develop VX-135. If we are not able to develop VX-135, or if our progress in developing VX-135 continues to be slowed significantly, our business may be adversely affected.

If our processes and systems are not compliant with regulatory requirements, we could be subject to restrictions on marketing our products or could be delayed in submitting regulatory filings seeking approvals for our drug candidates.

We have a number of regulated processes and systems that are required to obtain and maintain regulatory approval for our drugs and drug candidates. These processes and systems are subject to continual review and periodic inspection by the FDA and other regulatory bodies. If compliance issues are identified at any point in the development and approval process, we may experience delays in filing for regulatory approval for our drug candidates, or delays in obtaining regulatory approval after filing. Any later discovery of previously unknown problems or safety issues with approved drugs or manufacturing processes, or failure to comply with regulatory requirements, may result in restrictions on such drugs or manufacturing processes, withdrawal of drugs from the market, the imposition of civil or criminal penalties or a refusal by the FDA and/or other regulatory bodies to approve pending applications for marketing approval of new drugs or supplements to approved applications, any of which could have a material adverse effect on our business. In addition, we are a party to agreements that transfer responsibility for complying with specified regulatory requirements, such as filing and maintenance of marketing authorizations and safety reporting or compliance with manufacturing requirements, to our collaborators and third-party manufacturers. If our collaborators or third-party manufacturers do not fulfill these regulatory obligations, any drugs for which we or they obtain approval may be subject to later restrictions on manufacturing or sale, which could have a material adverse effect on our business.

Risks Related to Collaborators, Manufacturing and Reliance on Third Parties

We face risks in connection with existing and future collaborations with respect to the development, manufacture and commercialization of our products and drug candidates.

The risks that we face in connection with our current and any future collaborations include the following:

• Our collaborators may change the focus of their development and commercialization efforts or may have insufficient resources to effectively develop our drug candidates. The ability of some of our products and drug candidates to reach their potential could be limited if collaborators decrease or fail to increase development or commercialization efforts related to those products or drug candidates.

• Any future collaboration agreements may have the effect of limiting the areas of research and development that we may pursue, either alone or in collaboration with third parties.

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• Collaborators may develop and commercialize, either alone or with others, drugs that are similar to or competitive with the drugs or drug candidates that are the subject of their collaborations with us.

• Our collaboration agreements are subject to termination under various circumstances.

We in-license VX-135 from Alios, and any loss of this license would materially harm our efforts to develop an all-oral treatment regimen for HCV infection.

We depend on third-party manufacturers, including a sole source manufacturer, to manufacture our products and the materials we require for our clinical trials. We may not be able to maintain these relationships and could experience supply disruptions outside of our control.

We rely on a worldwide network of third-party manufacturers to manufacture and distribute KALYDECO (ivacaftor) and INCIVEK (telaprevir) for commercial sale, and our drug candidates for clinical trials. As a result of our reliance on these third-party manufacturers and suppliers, including a sole source supplier of one of our manufacturing processes, we could be subject to significant supply disruptions outside of our control. Our supply chain for sourcing raw materials and manufacturing drug product ready for distribution is a multi-step international endeavor. Third-party contract manufacturers, including some in China, supply us with raw materials, and contract manufacturers in the European Union and the United States convert these raw materials into drug substance and convert the drug substance into final dosage form. Establishing and managing this global supply chain requires a significant financial commitment and the creation and maintenance of numerous third-party contractual relationships. Although we attempt to effectively manage the business relationships with companies in our supply chain, we do not have control over their operations.

Supply disruptions may result from a number of factors, including shortages in product raw materials, labor or technical difficulties, regulatory inspections or restrictions, shipping or customs delays or any other performance failure by any third-party manufacturer on which we rely. Any supply disruptions could disrupt sales of our products and/or the timing of our clinical trials. Furthermore, we may be required to modify our production methods to permit us to economically manufacture our drugs for sale and our drug candidates for clinical trials. These modifications may require us to re-evaluate our resources and the resources of our third-party manufacturers, which could result in abrupt changes in our production methods and supplies.

We require a supply of ivacaftor for commercial sale (as KALYDECO) and ivacaftor, lumacaftor and our other drug candidates for use in our clinical trials. We obtain ivacaftor and lumacaftor to meet our commercial and clinical supply needs through a third-party manufacturing network. Our supply chain for KALYDECO includes a sole source supplier for one of our manufacturing processes. A disruption in the commercial supply of KALYDECO for patients would have a significant impact on patients, our business and our product revenues. A disruption in the clinical supply of ivacaftor or ivacaftor in combination with lumacaftor could delay the completion of clinical trials and impact timelines for filing an sNDA, NDA and comparable foreign regulatory submissions. There can be no assurance that we will be able to establish a secondary manufacturer for all of our ivacaftor supply needs on a timely basis or at all.

In the course of providing its services, a contract manufacturer may develop process technology related to the manufacture of our products or drug candidates that the manufacturer owns, either independently or jointly with us. This would increase our reliance on that manufacturer or require us to obtain a license from that manufacturer in order to have our products or drug candidates manufactured by other suppliers utilizing the same process.

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We may not be able to attract collaborators or external funding for the development and commercialization of certain of our drug candidates.

As part of our ongoing strategy, we may seek additional collaborative arrangements or external funding for certain of our development programs and/or seek to expand existing collaborations to cover additional commercialization and/or development activities. We have a number of research programs and early-stage clinical development programs, and we have entered into a non-exclusive collaboration agreement with BMS to evaluate VX-135 in combination with daclatasvir. At any time, we may determine that in order to continue development of a drug candidate or program or successfully commercialize a drug we need to identify a collaborator or amend or expand an existing collaboration. Potentially, and depending on the circumstances, we may desire that a collaborator either agree to fund portions of a drug development program led by us, or agree to provide all the funding and directly lead the development and commercialization of a program. No assurance can be given that any efforts we make to seek additional collaborative arrangements will be successfully completed on a timely basis or at all. If we are unable to enter into acceptable collaborative relationships, one or more of our development programs could be delayed or terminated and the possibility of our receiving a return on our investment in the program could be impaired.

We rely on third parties to conduct our clinical trials, and those third parties may not perform satisfactorily, including failing to meet established deadlines for the completion of such trials or regulatory requirements.

We rely on third parties such as contract research organizations to help manage our clinical trial process and on medical institutions and clinical investigators to enroll qualified patients and conduct our clinical trials. Our reliance on these third parties for clinical development activities reduces our control over these activities. Accordingly, these third-party contractors may not complete activities on schedule, or may not conduct our clinical trials in accordance with regulatory requirements or our trial design. If these third parties do not successfully carry out their contractual duties or meet expected deadlines, we may be required to replace them. Although we believe that there are a number of other third-party contractors we could engage to continue these activities, it may result in a delay of the affected trial. If clinical trials are not conducted in accordance with our contractual expectations or regulatory requirements, action by regulatory authorities might significantly and adversely affect the conduct or progress of these trials or in specific circumstances might result in a requirement that a trial be redone. Accordingly, our efforts to obtain regulatory approvals for and commercialize our drug candidates could be delayed.

Risks Related to Intellectual Property

If our patents do not protect our drugs, or our drugs infringe third-party patents, we could be subject to litigation and substantial liabilities.

We have numerous issued patents and patent applications pending in the United States, as well as counterparts in other countries. Our success will depend, in significant part, on our ability to obtain and maintain U.S. and foreign patent protection for our drugs, their uses and our processes, to preserve our trade secrets and to operate without infringing the proprietary rights of third parties. In particular, we believe that composition-of-matter claims are the most significant patent claims for companies in our segment of the pharmaceutical industry, which focuses on small molecules that are new chemical compounds. While we have patents or patent applications with composition-of-matter claims for each of our products and clinical drug candidates, only a portion of these patents have been granted. We cannot be certain that any patents will issue from our patent applications or, even if patents issue or have issued, that the issued claims will provide us with any significant protection against competitive products or otherwise be valuable commercially.

Due to evolving legal standards relating to the patentability, validity and enforceability of patents covering pharmaceutical inventions and the scope of claims made under these patents, our ability to maintain, obtain and enforce patents is uncertain and involves complex legal and factual questions. U.S. and foreign patent applications typically are maintained in confidence for a period of time after they initially are filed with the applicable patent office. Similarly, publication of discoveries in the scientific literature often lag behind actual discoveries. Consequently, we cannot be certain that we or our licensors were the first to invent, or the first to file patent applications on, our products or drug candidates or their use. If a third party also has filed a U.S. patent application relating to our products or drug candidates or a similar invention, we may have to participate in interference proceedings to determine priority of invention and could lose our patent position. Furthermore, we may not have identified all U.S. and foreign patents or published applications that affect our business by blocking our ability to commercialize our drugs or drug candidates.

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Our patents may be challenged by third parties, resulting in the patent being deemed invalid, unenforceable or narrowed in scope, or the third party may circumvent any such issued patents. Also, our pending patent applications may not issue, and we may not receive any additional patents. Our patents might not contain claims that are sufficiently broad to prevent others from utilizing our technologies. For instance, the issued patents relating to our products or drug candidates may be limited to a particular molecule or molecules and may not cover similar molecules that have similar clinical properties. Consequently, our competitors may independently develop competing products that do not infringe our patents or other intellectual property.

The laws of many foreign jurisdictions do not protect intellectual property rights to the same extent as in the United States and many companies have encountered significant difficulties in protecting and defending such rights in foreign jurisdictions. If we encounter such difficulties in protecting or are otherwise precluded from effectively protecting our intellectual property rights in foreign jurisdictions, our business could be substantially harmed.

Because of the extensive time required for development, testing and regulatory review of a drug candidate, it is possible that, before a drug candidate can be commercialized, the related patent may expire or remain in force for only a short period following commercialization of such drug candidate, thereby reducing any advantages of the patent. To the extent our drug candidates are not commercialized significantly ahead of the expiration date of any applicable patent, or to the extent we have no other patent protection on such drug candidates, those drug candidates would not be protected by patents, and we would then rely solely on other forms of exclusivity, such as regulatory exclusivity provided by the FDCA.

Risks Related To Our Operations

If we are unable to successfully implement our strategic plan, our business may be materially harmed.

Our strategy is to make focused investments to invent and develop innovative drugs, while we continue to market our products to eligible patients to generate revenues and maintain a strong financial position. We expect our total revenues to decline significantly in 2014 as compared to 2013 as a result of expected decreases in INCIVEK and INCIVO revenues. While we are seeking to increase our revenues from KALYDECO, we do not believe that in the near term these potential increased revenues will be sufficient to offset expected declines in INCIVEK and INCIVO revenues. In order to maintain a strong financial position, we are focusing our investment on CF and advancing our other research and early-stage development programs.

We may not be able increase or sustain our revenues from therapies for the treatment of CF, which would make it difficult to maintain a strong financial position and continue our research and development investments at the levels we currently plan. In addition, there can be no assurance that our development programs will be successful or that our research programs will result in drugs that we can successfully develop and commercialize.

If we fail to manage our operations effectively, our business may suffer.

We have expanded our global operations and capabilities, which has placed, and will continue to place, significant demands on our management and our operational, research and development and financial infrastructure. To effectively manage our business, we need to:

• implement and clearly communicate our corporate-wide strategies;

• enhance our operational and financial infrastructure, including our controls over records and information;

• enhance our operational, financial and management processes, including our cross-functional decision-making processes and our budget prioritization systems;

• train and manage our global employee base;

• transition from a U.S.-centric company into an organization capable of developing and commercializing multiple drug candidates in international markets; and

• enhance our compliance and legal resources.

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Our transition to our new corporate headquarters in Boston, Massachusetts could materially disrupt our business operations.

Our transition to our new corporate headquarters in Boston, Massachusetts is complicated and requires us to expend significant logistical and financial resources in 2014. Our corporate headquarters and primary research facilities were located in Cambridge, Massachusetts in close proximity to numerous other biotechnology companies since our founding in 1989. While we do not expect the move to result in significant turnover, we cannot be sure that we will be able to retain all our key scientific, commercial and management employees.

We are conducting a staggered move of employees, office and laboratory supplies and certain equipment from our previous facilities to our new corporate headquarters. The transition may cause disruptions to our business operations in Massachusetts, including disruptions to our use of certain laboratories and other research and development facilities that were not included in the January 2014 move of a majority of our employees. We also need to complete the decommissioning of our existing facilities in Cambridge, Massachusetts in a timely and cost-effective manner. Our business operations could be materially harmed if the disruptions to our use of certain laboratories and other research and development facilities are more significant than expected.

Our business has a substantial risk of product liability claims. If we do not obtain appropriate levels of insurance, product liability claims could adversely affect our business.

Our business exposes us to significant potential product liability risks that are inherent in the development, clinical testing, manufacturing and sales and marketing of human therapeutic products. We have product liability insurance and clinical trial insurance in amounts that we believe are adequate to cover this risk. However, our insurance may not provide adequate coverage against potential liabilities. If a claim is brought against us, we might be required to pay legal and other expenses to defend the claim, as well as pay uncovered damages awards resulting from a claim brought successfully against us and these damages could be significant and have a material adverse effect on our financial condition. Furthermore, whether or not we are ultimately successful in defending any such claims, we might be required to direct significant financial and managerial resources to such defense and adverse publicity is likely to result.

Risks associated with operating in foreign countries could materially adversely affect our business.

We have expanded our international operations over the past several years in order to market KALYDECO and expand our research and development capabilities. In 2013, a substantial portion of our revenues and expenses were associated with our foreign operations. In addition, a significant portion of our commercial supply chain, including sourcing of raw materials and manufacturing, is located in China, Japan and the European Union. Consequently, we are, and will continue to be, subject to risks related to operating in foreign countries. Risks associated with conducting operations in foreign countries include:

• differing regulatory requirements for drug approvals and regulation of approved drugs in foreign countries;

• collectibility of accounts receivable;

• unexpected changes in tariffs, trade barriers and regulatory requirements;

• economic weakness, including inflation, or political instability in particular foreign economies and markets;

• compliance with tax, employment, immigration and labor laws for employees living or traveling abroad;

• foreign taxes, including withholding of payroll taxes;

• foreign currency fluctuations, which could result in increased operating expenses or reduced revenues, and other obligations incident to doing business or operating in another country;

• workforce uncertainty in countries where labor unrest is more common than in the United States;

• production shortages resulting from any events affecting raw material supply or manufacturing capabilities abroad; and

• business interruptions resulting from geo-political actions, including war and terrorism.

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These and other risks associated with our international operations could materially adversely affect our business.

In addition, our international operations are subject to regulation under U.S. law. For example, the Foreign Corrupt Practices Act prohibits U.S. companies and their representatives from offering, promising, authorizing or making payments to foreign officials for the purpose of obtaining or retaining business abroad. In many countries, the health care professionals we regularly interact with may meet the definition of a foreign government official for purposes of the Foreign Corrupt Practices Act. We also are subject to import/export control laws. Failure to comply with domestic or foreign laws could result in various adverse consequences, including the possible delay in approval or refusal to approve a product, recalls, seizures, withdrawal of an approved product from the market, the imposition of civil or criminal sanctions, the prosecution of executives overseeing our international operations and corresponding bad publicity and negative perception of our company in foreign countries.

If we acquire or license technologies, resources or drug candidates, we will incur a variety of costs and may never realize benefits from the transaction.

If appropriate opportunities become available, we might license or acquire technologies, resources, drugs or drug candidates. We might never realize the anticipated benefits of such a transaction, and we may later incur impairment charges related to assets acquired in any such transaction. In particular, due to the risks inherent in drug development, we may not successfully develop or obtain marketing approval for the drug candidates we acquire. For example, in 2013 we incurred intangible asset impairment charges of $663.5 million relating to drug candidates for the treatment of HCV infection. Future licenses or acquisitions could result in potentially dilutive issuances of equity securities, the incurrence of debt, the creation of contingent liabilities, impairment expenses related to goodwill, and impairment or amortization expenses related to other intangible assets, which could harm our financial condition.

If we fail to attract and retain skilled employees, our business could be materially harmed.

Because our drug discovery and development activities are highly technical in nature, we require the services of highly qualified and trained scientists who have the skills necessary to conduct these activities. In addition, we need to attract and retain employees with experience in marketing and commercialization of medicines. We face intense competition for our personnel from our competitors and other companies throughout our industry. Moreover, the growth of local biotechnology companies and the expansion of major pharmaceutical companies into the Boston area have increased competition for the available pool of skilled employees, especially in technical fields, and the high cost of living in Massachusetts makes it difficult to attract employees from other parts of the country to Massachusetts. In addition, our October 2013 restructuring activities may make it more difficult to attract and retain qualified employees. Our ability to commercialize our products, and achieve our research and development objectives, depends on our ability to respond effectively to these demands. If we are unable to hire and retain qualified personnel, there could be a material adverse effect on our business.

The loss of the services of key employees or the failure to effectively integrate key employees could negatively affect our business.

Our future success will depend in large part on our ability to retain the services of our key scientific and management personnel and to integrate new scientific and management personnel into our business. A loss of key personnel or a failure to properly integrate new personnel could be disruptive. We have entered into employment agreements with some executives and provide compensation-related benefits to all of our key employees that vest over time and therefore induce them to remain with us. However, the employment agreements can be terminated by the executive on relatively short notice. The value to employees of stock-related benefits that vest over time—such as options and restricted stock—is significantly affected by movements in our stock price, and may at any point in time be insufficient to counteract more lucrative offers from other companies. A failure to retain, as well as hire, train and effectively integrate into our organization a sufficient number of qualified scientists, professionals, sales personnel and senior management would negatively affect our business.

If we do not comply with laws regulating the protection of the environment and health and human safety, our business could be adversely affected.

Our research and development efforts involve the controlled use of hazardous materials, chemicals and various radioactive compounds. Although we believe that our safety procedures for handling and disposing of these materials comply with the standards prescribed by state, federal and foreign regulations, the risk of accidental contamination or injury from these materials can not be eliminated. If an accident occurs, we could be held liable for resulting damages, which could be substantial. We also are subject to numerous environmental, health and workplace safety laws and regulations, including

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those governing laboratory procedures, exposure to blood-borne pathogens and the handling of biohazardous materials. Although we maintain workers’ compensation insurance to cover us for costs we may incur due to injuries to our employees resulting from the use of these materials, this insurance may not provide adequate coverage against potential liabilities. We maintain insurance to cover pollution conditions or other extraordinary or unanticipated events relating to our use and disposal of hazardous materials that we believe is appropriate based on the small amount of hazardous materials we generate. Additional federal, state and local laws and regulations affecting our operations may be adopted in the future. We may incur substantial costs to comply with, and substantial fines or penalties if we violate, any of these laws or regulations.

Risks Related to Holding Our Common Stock and Potential Financing Activities

Our stock price may fluctuate.

Market prices for securities of companies such as ours are highly volatile. From January 1, 2012 to December 31, 2013, our common stock traded between $32.04 and $89.96 per share. The market for our stock, like that of other companies in the biotechnology industry, has experienced significant price and volume fluctuations. The future market price of our securities could be significantly and adversely affected by factors such as:

• the information contained in our quarterly earnings releases, including our net product revenues and operating expenses for completed periods and guidance regarding future periods;

• announcements of FDA actions with respect to our drugs or our competitors’ drugs, or regulatory filings for our drug candidates or those of our competitors, or of results of clinical trials or nonclinical studies relating to our drugs, drug candidates or those of our competitors;

• prescription data and other information disclosed by third-parties regarding our business or products;

• technological innovations or the introduction of new drugs by our competitors;

• government regulatory action;

• public concern as to the safety of drugs developed by us or our competitors;

• developments in patent or other intellectual property rights or announcements relating to these matters;

• developments in domestic and international governmental policy or regulation, for example, relating to intellectual property rights;

• developments relating specifically to other companies and market conditions for pharmaceutical and biotechnology stocks or stocks in general;

• business development, capital structuring or financing activities; and

• general worldwide or national economic, political and capital market conditions.

Our quarterly operating results are subject to significant fluctuation.

Our operating results have fluctuated from quarter to quarter in the past, and we expect that they will continue to do so in the future. Factors that have caused quarterly fluctuations in the past include variable amounts of net product revenues and collaborative revenues, impairment charges, charges for excess and obsolete inventories, changes in the fair value of derivative instruments and the deconsolidation of Alios. We cannot accurately predict our future revenues from our products, and our revenues from our products could vary on a quarterly basis. Our revenues from our products may be affected by, among other factors, seasonality and the timing of orders from our significant customers. Our quarterly results also could be significantly affected by significant charges, which may or may not be similar to charges we have experienced in the past. Most of our operating expenses relate to our research and development activities, do not vary directly with the amount of revenues and are difficult to adjust in the short term. As a result, if revenues in a particular quarter are below expectations, we are unlikely to proportionately reduce operating expenses for that quarter. These examples are only illustrative and other risks, including those discussed in these “Risk Factors,” could also cause fluctuations in our reported financial results. Our operating results during any one period do not necessarily suggest the results of future periods.

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We expect that results from our clinical development activities and the clinical development activities of our competitors will continue to be released periodically, and may result in significant volatility in the price of our common stock.

Any new information regarding our products and drug candidates or competitive products or potentially competitive drug candidates can substantially affect investors’ perceptions regarding our future prospects. We, our collaborators and our competitors periodically provide updates regarding drug development programs, typically through press releases, conference calls and presentations at medical conferences. These periodic updates often include interim or final results from clinical trials conducted by us or our competitors and/or information about our or our competitors’ expectations regarding regulatory filings and submissions as well as future clinical development of our products or drug candidates, competitive products or potentially competitive drug candidates. The timing of the release of information by us regarding our drug development programs is often beyond our control and is influenced by the timing of receipt of data from our clinical trials and by the general preference among pharmaceutical companies to disclose clinical data during medical conferences. In addition, the information disclosed about our clinical trials, or our competitors' clinical trials, may be based on interim rather than final data that may involve interpretation difficulties and may in any event not accurately predict final results.

We could be negatively affected by securities class action complaints.

On September 6, 2012, a purported securities class action lawsuit was commenced in the United States District Court for the District of Massachusetts under the caption City of Bristol Pension Fund v. Vertex Pharmaceuticals Incorporated, et al., naming as defendants us and certain of our current and former officers and directors. The lawsuit alleges that we made material misrepresentations and/or omissions of material fact in our public disclosures during the period from May 7, 2012 through June 28, 2012, all in violation of Section 10(b) of the Securities Exchange Act of 1934, as amended, and Rule 10b-5 promulgated thereunder. By order dated December 12, 2012, the court appointed the City of Bristol lead plaintiff and appointed the City of Bristol's attorneys lead counsel. The plaintiffs filed an amended complaint on February 11, 2013. We filed a motion to dismiss the complaint on April 12, 2013. On May 28, 2013, the plaintiffs filed an opposition to our motion to dismiss the complaint. On June 27, 2013, we filed a reply in further support of our motion to dismiss the plaintiffs' complaint. The court conducted a hearing on our motion to dismiss on November 25, 2013. The plaintiffs seek unspecified monetary damages on behalf of the putative class and an award of costs and expenses, including attorney's fees, as well as disgorgement of the proceeds from certain individual defendants' sales of our common stock. We believe that this action is without merit and intend to defend it vigorously. This action will take time and money to defend and may distract us from more productive activities. No assurance can be provided that we will be successful in defending this claim or that insurance proceeds will be sufficient to cover any liability under such claims.

We may need to raise additional capital that may not be available.

We expect to incur significant losses in 2014 and, although we do not have any plans to do so in the near term, we may in the future need to raise additional capital. Any potential public offering or private placement may or may not be similar to the transactions that we have completed in the past. Any debt financing may be on terms that, among other things, include conversion features that could result in dilution to our then-existing security holders and restrict our ability to pay interest and dividends—although we do not intend to pay dividends for the foreseeable future. Any equity financings would result in dilution to our then-existing security holders. If adequate funds are not available on acceptable terms, or at all, we may be required to curtail significantly or discontinue one or more of our research, drug discovery or development programs, including clinical trials, incur significant cash exit costs, or attempt to obtain funds through arrangements with collaborators or others that may require us to relinquish rights to certain of our technologies, drugs or drug candidates. Based on many factors, including general economic conditions, additional financing may not be available on acceptable terms, if at all.

Issuances of additional shares of our common stock could cause the price of our common stock to decline.

As of December 31, 2013, we had 233.8 million shares of common stock issued and outstanding. As of December 31, 2013, we also had outstanding options to purchase 15.7 million shares of common stock with a weighted-average exercise price of $44.40 per share. Outstanding vested options are likely to be exercised if the market price of our common stock exceeds the applicable exercise price, and, in the future, we expect to issue additional options and restricted stock to directors and employees. In addition, we may issue additional common stock or restricted securities in the future as part of financing activities or business development activities and any such issuances may have a dilutive effect on our then-existing shareholders. Sales of substantial amounts of our common stock in the open market, or the availability of such shares for sale, could adversely affect the price of our common stock. The issuance of restricted common stock or common stock upon

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exercise of any outstanding options would be dilutive, and may cause the market price for a share of our common stock to decline.

We have adopted anti-takeover provisions and are subject to Massachusetts corporate laws that may frustrate any attempt to remove or replace our current management or effectuate a business combination involving Vertex.

Our corporate charter and by-law provisions and Massachusetts state laws may discourage certain types of transactions involving an actual or potential change of control of Vertex that might be beneficial to us or our security holders. Our charter provides for staggered terms for the members of the Board of Directors. Our by-laws grant the directors a right to adjourn annual meetings of shareholders, and certain provisions of our by-laws may be amended only with an 80% shareholder vote. We may issue shares of any class or series of preferred stock in the future without shareholder approval and upon such terms as our Board of Directors may determine. The rights of the holders of common stock will be subject to, and may be adversely affected by, the rights of the holders of any class or series of preferred stock that may be issued in the future. Massachusetts state law prohibits us from engaging in specified business combinations, unless the combination is approved or consummated in a prescribed manner, and prohibits voting by any shareholder who acquires 20% or more of our voting stock without shareholder approval. As a result, shareholders or other parties may find it more difficult to remove or replace our current management.

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

This Annual Report on Form 10-K and, in particular, the description of our Business set forth in Item 1, the Risk Factors set forth in this Item 1A and our Management’s Discussion and Analysis of Financial Condition and Results of Operations set forth in Item 7 contain or incorporate a number of forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, including statements regarding:

• our expectations regarding the amount of, timing of and trends with respect to our revenues, costs and expenses and other gains and losses, including those related to net product revenues from KALYDECO and INCIVEK;

• our expectations regarding clinical trials, development timelines and regulatory authority filings and submissions for ivacaftor, lumacaftor, VX-135 and VX-661;

• our expectations regarding the timing of data from our clinical trials of ivacaftor and lumacaftor in combination with ivacaftor, the possibility of using that data to support regulatory submissions and the timing of those potential submissions;

• our ability to successfully market our products or any of our other drug candidates for which we obtain regulatory approval;

• our expectations regarding the timing and structure of clinical trials of our drugs and drug candidates, including, ivacaftor, lumacaftor, VX-135 and VX-661, and the expected timing of our receipt of data from our ongoing and planned clinical trials;

• the data that will be generated by ongoing and planned clinical trials and the ability to use that data to advance compounds, continue development or support regulatory filings;

• our beliefs regarding the support provided by clinical trials and preclinical and nonclinical studies of our drug candidates for further investigation, clinical trials or potential use as a treatment;

• our plan to continue investing in our research and development programs and our strategy to develop our drug candidates, alone or with third party-collaborators;

• the establishment, development and maintenance of collaborative relationships;

• potential business development activities;

• our estimates regarding the charges associated with our October 2013 workforce reduction and our other restructuring activities;

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• our ability to use our research programs to identify and develop new drug candidates to address serious diseases and significant unmet medical needs; and

• our liquidity and our expectations regarding the possibility of raising additional capital.

Any or all of our forward-looking statements in this Annual Report on Form 10-K may turn out to be wrong. They can be affected by inaccurate assumptions or by known or unknown risks and uncertainties. Many factors mentioned in this Annual Report on Form 10-K will be important in determining future results. Consequently, no forward-looking statement can be guaranteed. Actual future results may vary materially from expected results. We also provide a cautionary discussion of risks and uncertainties under “Risk Factors” above in this Item 1A. These are factors and uncertainties that we think could cause our actual results to differ materially from expected results. Other factors and uncertainties besides those listed there could also adversely affect us.

Without limiting the foregoing, the words “believes,” “anticipates,” “plans,” “intends,” “expects” and similar expressions are intended to identify forward-looking statements. There are a number of factors and uncertainties that could cause actual events or results to differ materially from those indicated by such forward-looking statements, many of which are beyond our control, including the factors and uncertainties set forth under “Risk Factors” above in this Item 1A. In addition, the forward-looking statements contained herein represent our estimate only as of the date of this filing and should not be relied upon as representing our estimate as of any subsequent date. While we may elect to update these forward-looking statements at some point in the future, we specifically disclaim any obligation to do so to reflect actual results, changes in assumptions or changes in other factors affecting such forward-looking statements.

ITEM 1B. UNRESOLVED STAFF COMMENTS

We did not receive any written comments from the Securities and Exchange Commission prior to the date 180 days before the end of the fiscal year ended December 31, 2013 regarding our filings under the Securities Exchange Act of 1934, as amended, that have not been resolved.

ITEM 2. PROPERTIES

Corporate Headquarters

In the first quarter of 2014, we relocated our corporate headquarters from Cambridge, Massachusetts to two connected buildings that were built in Boston, Massachusetts. We lease approximately 1.1 million square feet of office and laboratory space in these two buildings pursuant to two leases that we entered into in May 2011. The leases commenced in December 2013 and will extend until December 2028. We have an option to extend the term of the leases for an additional ten years. In addition, in connection with our relocation to Boston, we entered into a lease in June 2012 for approximately 100,000 square feet of space in the Boston Marine Industrial Park, in close proximity to our corporate headquarters. We are using this additional space for certain logistical and laboratory operations and manufacturing equipment that will complement the office and laboratory facilities at our corporate headquarters.

Transition to Corporate Headquarters

We are completing the transition to our new corporate headquarters in Boston from our previous facilities, which were located in Cambridge, Massachusetts. A majority of our Massachusetts-based employees were relocated to the new corporate headquarters in January 2014. We expect to complete the relocation of our Massachusetts-based employees to our new facilities in the first half of 2014.

Existing Facilities in Cambridge, Massachusetts

We currently lease approximately 100,000 square feet of laboratory and office space for our former corporate headquarters, which were located at 130 Waverly Street, and approximately 192,000 square feet of laboratory and office space at 200 Sidney Street, located adjacent to our former corporate headquarters. The 130 Waverly Street and 200 Sidney Street leases expire on December 31, 2015. We lease approximately 145,000 square feet at 88 Sidney Street, Cambridge, Massachusetts under a lease that expires in June 2014. We are in the process of decommissioning our existing laboratory facilities at these locations.

The lease for our Kendall Square, Cambridge, Massachusetts facility will expire in 2018. We have subleased approximately 145,000 square feet of the Kendall Square facility, and used the remaining 147,000 square feet of space we

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lease for our research operations prior to the relocation. The subleases are for terms ending in 2015, with one sublease having an extension option to 2018.

Additional United States and Worldwide Locations

In addition to our facilities in Massachusetts, we lease an aggregate of approximately 242,000 square feet of space in facilities located in California, Washington D.C., Iowa, Canada, Switzerland, the United Kingdom, France, Germany, Australia, Ireland, Spain and the Netherlands. This includes laboratory and office space to support our research and development organizations in San Diego, California, Montreal, Canada, Coralville, Iowa and Milton Park, Abingdon, England.

ITEM 3. LEGAL PROCEEDINGS

On September 6, 2012, a purported shareholder class action, City of Bristol Pension Fund v. Vertex Pharmaceuticals Incorporated, et al., was filed in the United States District Court for the District of Massachusetts, naming us and certain of our current and former officers and directors as defendants. The lawsuit alleges that we made material misrepresentations and/or omissions of material fact in our public disclosures during the period from May 7, 2012 through June 28, 2012, all in violation of Section 10(b) of the Securities Exchange Act of 1934, as amended, and Rule 10b-5 promulgated thereunder. By order dated December 12, 2012, the court appointed the City of Bristol lead plaintiff and appointed the City of Bristol's attorneys lead counsel. The plaintiffs filed an amended complaint on February 11, 2013. We filed a motion to dismiss the complaint on April 12, 2013. On May 28, 2013, the plaintiffs filed an opposition to our motion to dismiss the complaint. On June 27, 2013, we filed a reply in further support of our motion to dismiss the plaintiffs' complaint. The court conducted a hearing on our motion to dismiss on November 25, 2013. The plaintiffs seek unspecified monetary damages on behalf of the putative class and an award of costs and expenses, including attorney's fees, as well as disgorgement of the proceeds from certain individual defendants' sales of our common stock. We believe that this action is without merit and intend to defend it vigorously.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

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PART II

ITEM 5. MARKET FOR REGISTRANT'S COMMON EQUITY, RELATED STOCKHOLDER MATTERS AND ISSUER PURCHASES OF EQUITY SECURITIES

Market Information

Our common stock is traded on The NASDAQ Global Select Market under the symbol “VRTX.” The following table sets forth for the periods indicated the high and low sale prices per share of our common stock as reported by NASDAQ Stock Market LLC:

Year Ended December 31, 2013:	High		Low
First quarter	$	55.93	$	42.72
Second quarter	87.47		51.28
Third quarter	89.96		73.43
Fourth quarter	78.38		58.06

Year Ended December 31, 2012:	High		Low
First quarter	$	43.13	$	32.04
Second quarter	66.10		35.26
Third quarter	59.98		46.03
Fourth quarter	60.00		38.44

Shareholders

As of January 31, 2014, there were 1,844 holders of record of our common stock.

Performance Graph

CUMULATIVE TOTAL RETURN

Based on Initial Investment of $100 on December 31, 2008

with dividends reinvested (fiscal years ended December 31)

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In 2013, we became part of the Standard & Poor's 500 ("S&P 500^®") Stock Index. As a result, this year we are including the cumulative total return of that index in addition to the broad equity market indexes we included in our annual report on Form 10-K for the year ended December 31, 2012.

Dividends

We have never declared or paid any cash dividends on our common stock, and we currently expect that any future earnings will be retained for use in our business.

Issuer Repurchases of Equity Securities

The table set forth below shows all repurchases of securities by us during the three months ended December 31, 2013:

Period	Total Number of Shares Purchased	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Maximum Number of Shares that May Yet be Purchased Under the Plans or Programs
Oct. 1, 2013 to Oct. 31, 2013	21,833	$	0.01	—	—
Nov. 1, 2013 to Nov. 30, 2013	462,198	$	0.01	—	—
Dec. 1, 2013 to Dec. 31, 2013	20,287	$	0.01	—	—

The repurchases were made under the terms of our Amended and Restated 2006 Stock and Option Plan. Under this plan, we award shares of restricted stock to our employees that typically are subject to a lapsing right of repurchase by us. We may exercise this right of repurchase if a restricted stock recipient’s service to us is terminated. If we exercise this right, we are required to repay the purchase price paid by or on behalf of the recipient for the repurchased restricted shares, which typically is the par value per share of $0.01. Repurchased shares returned to the Amended and Restated 2006 Stock and Option Plan are available for future awards under the terms of the plan.

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ITEM 6. SELECTED FINANCIAL DATA

The following unaudited selected consolidated financial data are derived from our audited consolidated financial statements. These data should be read in conjunction with our audited consolidated financial statements and related notes that are included elsewhere in this Annual Report on Form 10-K and with “Management’s Discussion and Analysis of Financial Condition and Results of Operations” included in Item 7 below.

	Year Ended December 31,
	2013			2012			2011			2010			2009
	(in thousands, except per share amounts)
Consolidated Statements of Operations Data:
Product revenues, net	$	837,645		$	1,333,458		$	950,889		$	—		$	—
Royalty revenues	156,592			141,498			50,015			30,244			28,320
Collaborative revenues (1)	217,738			52,086			409,722			113,126			73,569
Total revenues	1,211,975			1,527,042			1,410,626			143,370			101,889
Total costs and expenses (2)	2,115,423			1,524,710			1,296,806			839,447			715,901
Income (loss) from operations	(903,448		)	2,332			113,820			(696,077		)	(614,012		)
Net loss (income) attributable to noncontrolling interest (Alios) (3)	242,522			(55,897		)	(11,605		)	—			—
Net income (loss) attributable to Vertex (4)	$	(445,028	)	$	(107,032	)	$	29,574		$	(754,626	)	$	(642,178	)
Net income (loss) per diluted share attributable to Vertex common shareholders	$	(1.98	)	$	(0.50	)	$	0.14		$	(3.77	)	$	(3.71	)
Shares used in per diluted share calculations	224,906			211,946			208,807			200,402			173,259
	As of December 31,
	2013			2012			2011			2010			2009
	(in thousands)
Consolidated Balance Sheet Data:
Cash, cash equivalents and marketable securities	$	1,465,076		$	1,321,215		$	968,922		$	1,031,411		$	1,284,913
Total assets	2,319,041			2,759,288			2,204,280			1,725,446			1,955,488
Total current liabilities	397,829			432,624			392,348			474,783			284,883
Long-term debt obligations (5)	—			400,000			400,000			400,000			159,972
Construction financing lease obligation (6)	440,937			268,031			55,950			—			—
Other long-term obligations	123,870			424,251			390,470			346,690			414,287

(1) In 2013, we recorded $203.4 million of collaborative revenues from Janssen Pharmaceutica NV, which was primarily attributable to a 2013 amendment to our collaboration agreement with Janssen. In 2011, we recognized $318.5 million in milestone revenues from Janssen and Mitsubishi Tanabe Pharma Corporation. See Note B, "Collaborative Arrangements."

(2) In 2013 and 2012, total costs and expenses included an aggregate of $10.4 million and $133.2 million, respectively, of write-offs for excess and obsolete inventories. See Note G, "Inventories." In 2013, total costs and expenses included intangible asset impairment charges of $663.5 million. In 2011, total costs and expenses included an intangible asset impairment charge of $105.8 million. See Note J, "Intangible Assets and Goodwill."

(3) Net loss (income) attributable to noncontrolling interest (Alios) relates to our collaboration with Alios BioPharma, Inc, which we deconsolidated as of December 31, 2013. See Note B, "Collaborative Arrangements," and Note J, "Intangible Assets and Goodwill."

(4) In 2013, net loss attributable to Vertex included a deconsolidation gain of $68.2 million related to Alios. See Note B, "Collaborative Arrangements."

(5) In 2013, $400.0 million in aggregate principal amount of convertible senior subordinated notes (due 2015) was converted into common stock or redeemed. See Note L, "Convertible Senior Subordinated Notes."

(6) In 2011, we entered into two leases for our corporate headquarters, which we occupied in December 2013. We are deemed for accounting purposes to be the owner of the buildings. See Note I, "Fan Pier Leases."

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ITEM 7. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

OVERVIEW

We are in the business of discovering, developing, manufacturing and commercializing small molecule drugs. We invest in scientific innovation to create transformative medicines for patients with serious diseases in specialty markets. Our business is focused on developing and commercializing therapies for the treatment of cystic fibrosis, or CF, and advancing our other research and early-stage development programs, while maintaining our financial strength.

Since mid-2011, we have obtained approval for, and initiated commercial sales of, our first two products: KALYDECO (ivacaftor) and INCIVEK (telaprevir). KALYDECO is approved in the United States and international markets for the treatment of patients six years of age and older with CF who have a specific genetic mutation in their cystic fibrosis transmembrane conductance regulator, or CFTR, gene, which is referred to as the G551D mutation. INCIVEK is approved in the United States and Canada for the treatment of adults with genotype 1 hepatitis C virus, or HCV, infection. Our collaborators, Janssen Pharmaceutica NV, or Janssen, and Mitsubishi Tanabe Pharma Corporation, or Mitsubishi Tanabe, market telaprevir in other international markets. Our fourth quarter 2013 net product revenues included KALYDECO net product revenues of $109.4 million and INCIVEK net product revenues of $19.4 million.

Cystic Fibrosis

Our plan is to (i) increase the number of patients eligible for treatment with ivacaftor, (ii) evaluate ivacaftor in combination with lumacaftor for the treatment of patients with CF who have the most prevalent mutation in their CFTR gene and (iii) research and develop earlier-stage compounds for the treatment of CF.

Our net product revenues from KALYDECO have increased on a quarterly basis since we obtained marketing approval in the first quarter of 2012. KALYDECO was approved in 2012 in the United States and European Union as a treatment for patients with CF six years of age and older who have the G551D mutation in their CFTR gene. We believe that most patients with CF six years of age and older who have the G551D mutation in the United States and Europe have started treatment with KALYDECO. In 2013, we submitted a supplemental New Drug Application, or sNDA, to the U.S. Food and Drug Administration, or FDA, and a Marketing Authorization Application, or MAA, variation in the European Union seeking approval to market ivacaftor for the treatment of patients with CF six years of age and older who have specified other mutations in their CFTR gene, which were studied in our first label-expansion clinical trial for ivacaftor. The FDA has set a target date of March 27, 2014 to complete its review of this sNDA under the Prescription Drug User Fee Act (PDUFA). We also are seeking to expand the number of patients eligible for treatment with ivacaftor by (i) evaluating ivacaftor as a potential treatment for patients with CF who have residual CFTR function, including patients with CF who have the R117H mutation in their CFTR gene, and (ii) evaluating ivacaftor as a potential treatment for patients with CF two to five years of age who have specific mutations in their CFTR genes. In addition, we are in discussions with relevant agencies in Australia and Canada regarding public reimbursement of the cost of KALYDECO for patients with CF six years of age and older in these countries who have the G551D mutation in their CFTR gene.

In October 2013, we completed enrollment in a Phase 3 development program to evaluate combinations of ivacaftor and lumacaftor, our most advanced investigational CFTR corrector compound. The Phase 3 development program includes two Phase 3 clinical trials, referred to as TRAFFIC and TRANSPORT, that each enrolled patients 12 years of age and older with CF who have two copies (homozygous) of the F508del mutation in their CFTR gene. We expect data from TRAFFIC and TRANSPORT in mid-2014. If TRAFFIC and TRANSPORT are successful, we plan to submit a New Drug Application, or NDA, to the FDA and an MAA in the European Union, in the second half 2014.

We are evaluating VX-661, a second investigational CFTR corrector, in combination with ivacaftor, in Phase 2 clinical development. We also are seeking to identify and develop next-generation CFTR corrector compounds that could be evaluated in regimens combining ivacaftor with two CFTR corrector compounds.

HCV Infection

Over the past several years, we have obtained most of our product revenues from INCIVEK sales and focused a large portion of our resources on commercializing INCIVEK and seeking to develop other drug candidates for the treatment of HCV infection. Our INCIVEK net product revenues have been declining on a quarterly basis since reaching a peak in the fourth quarter of 2011, and declined rapidly over the course of 2013, including a 77% decline in INCIVEK net product

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revenues in the fourth quarter of 2013 as compared to the third quarter of 2013. We expect this trend to continue as a result of the introduction in the fourth quarter of 2013 of new competitive therapies for the treatment of HCV infection.

In 2013, in response to declining sales of INCIVEK and increased competition, we reduced our focus on INCIVEK, and based on additional information regarding our HCV drug development candidates and advances made by our competitors, we incurred significant impairment charges related to our HCV drug development candidates, as follows:

Impairment of VX-222. In the first quarter of 2013, we recorded a $412.9 million intangible asset impairment charge based on a determination that the fair value of our indefinite-lived in-process research and development asset related to VX-222, a drug we were developing for the treatment of HCV infection, had decreased to zero. In connection with this impairment charge, we recorded a credit of $127.6 million in our provision for income taxes, and the net effect of this impairment charge was an increase in the net loss attributable to Vertex of $285.3 million in 2013.

Workforce Reduction. In the fourth quarter of 2013, we reduced our workforce by eliminating approximately 370 full-time positions globally, representing an approximately 15% reduction in our workforce. The eliminated positions included the portion of our U.S. field-based sales force focused on promoting INCIVEK. In the second half of 2013, we incurred approximately $39.0 million in restructuring charges related to this workforce reduction. We expect the restructuring to result in a significant reduction in our sales, general and administrative expenses in 2014 as compared to 2013.

VX-135. In the fourth quarter of 2013, we recorded a $250.6 million intangible asset impairment charge, based on a determination that the fair value of our indefinite-lived in-process research and development asset related to our HCV nucleotide analogue (VX-135) program was impaired. In connection with this impairment charge, a benefit for income taxes was recorded related to the reversal of a deferred tax liability, and we deconsolidated our variable interest entity, Alios BioPharma, Inc., or Alios, as of December 31, 2013. The consolidation of Alios into our financial statements from June 2011 through December 2013, the impairment charge related to our HCV nucleotide analogue program in the fourth quarter of 2013 and the related deconsolidation of Alios have had a material effect on our consolidated statements of operations. The impairment charge resulted in the deconsolidation of Alios and a gain of $68.2 million attributable to Vertex in 2013. The gain of $68.2 million is approximately equal to the difference between (i) losses we recorded in 2011 and 2012 based on increases in the fair value of contingent milestone payments and royalties payable by us to Alios and (ii) an aggregate of $120.0 million in up-front and milestone payments that we made to Alios. We are in discussions with Alios and Bristol-Myers Squibb, or BMS, regarding potential next steps for further clinical evaluation of VX-135 in combination with BMS's daclatasvir.

In 2014, we expect that only a small portion of our net product revenues will be due to INCIVEK and that a relatively small portion of our research and development expenses will be related to our drugs and drug candidates for the treatment of HCV infection.

Research and Early-Stage Development

We are engaged in a number of other research and early-stage development programs, including programs in the areas of oncology, multiple sclerosis and other serious and rare diseases. Over the last year, we have evaluated in Phase 2 clinical trials: VX-509, our JAK3 inhibitor, in patients with rheumatoid arthritis and VX-787, a drug candidate for the treatment of influenza A. We are seeking collaborators to advance the clinical development of VX-509 and VX-787. We plan to continue investing in our research programs as well as our early-stage development programs, and fostering scientific innovation in order to identify and develop transformative medicines. We believe that pursuing research in diverse areas allows us to balance the risks inherent in drug development and may provide drug candidates that will form our pipeline in future years.

Balance Sheet

As of December 31, 2013, we had cash, cash equivalents and marketable securities of approximately $1.47 billion, which represented an increase of $143.9 million from $1.32 billion as of December 31, 2012. This increase was the result of cash received from product sales, royalties, issuances of common stock pursuant to employee benefit plans and other financing activities, offset by cash expenditures to operate our business. We amended our collaboration agreement with Janssen to provide Janssen a fully-paid license to market INCIVO in return for a $152.0 million payment. Beginning in 2014, we will no longer receive royalties based on sales of INCIVO. In order to further strengthen our balance sheet, we converted $400.0 million in aggregate principal amount of our 3.35% convertible senior subordinated notes due 2015, or 2015 Notes, into 8.3

53

million shares of our common stock in 2013, reducing our future cash commitments by the principal amount of the 2015 Notes plus the associated future interest payments.

Drug Discovery and Development

Discovery and development of a new pharmaceutical product is a difficult and lengthy process that requires significant financial resources along with extensive technical and regulatory expertise and can take 10 to 15 years or more. Potential drug candidates are subjected to rigorous evaluations, driven in part by stringent regulatory considerations, designed to generate information concerning efficacy, side-effects, proper dosage levels and a variety of other physical and chemical characteristics that are important in determining whether a drug candidate should be approved for marketing as a pharmaceutical product. Most chemical compounds that are investigated as potential drug candidates never progress into development, and most drug candidates that do advance into development never receive marketing approval. Because our investments in drug candidates are subject to considerable risks, we closely monitor the results of our discovery research, clinical trials and nonclinical studies, and frequently evaluate our drug development programs in light of new data and scientific, business and commercial insights, with the objective of balancing risk and potential. This process can result in relatively abrupt changes in focus and priority as new information becomes available and we gain additional understanding of our ongoing programs and potential new programs as well as those of our competitors.

If we believe that data from a completed registration program support approval of a drug candidate, we submit an NDA to the FDA requesting approval to market the drug candidate in the United States and seek analogous approvals from comparable regulatory authorities in foreign jurisdictions. To obtain approval, we must, among other things, demonstrate with evidence gathered in nonclinical studies and well-controlled clinical trials that the drug candidate is safe and effective for the disease it is intended to treat and that the manufacturing facilities, processes and controls for the manufacture of the drug candidate are adequate. The FDA and foreign regulatory authorities have substantial discretion in deciding whether or not a drug candidate should be granted approval based on the benefits and risks of the drug candidate in the treatment of a particular disease, and could delay, limit or deny regulatory approval. If regulatory delays are significant or regulatory approval is limited or denied altogether, our financial results and the commercial prospects for the drug candidate involved will be harmed.

Regulatory Compliance

Our marketing of pharmaceutical products, which began in 2011, is subject to extensive and complex laws and regulations. We have a corporate compliance program designed to actively identify, prevent and mitigate risk through the implementation of compliance policies and systems and the promotion of a culture of compliance. Among other laws, regulations and standards, we are subject to various U.S. federal and state and comparable foreign laws pertaining to health care fraud and abuse, including anti-kickback and false claims statutes, and laws prohibiting the promotion of drugs for unapproved, or off-label, uses. Anti-kickback laws make it illegal for a prescription drug manufacturer to solicit, offer, receive or pay any remuneration in exchange for, or to induce, the referral of business, including the purchase or prescription of a particular drug. False claims laws prohibit anyone from presenting for payment to third-party payors, including Medicare and Medicaid, claims for reimbursed drugs or services that are false or fraudulent, claims for items or services not provided as claimed or claims for medically unnecessary items or services. We expect to continue to devote substantial resources to maintain, administer and expand these compliance programs globally.

Continuous Manufacturing

We are planning to use a continuous manufacturing process to manufacture co-formulated lumacaftor and ivacaftor tablets. We have established continuous manufacturing capabilities at our third-party manufacturer in the United Kingdom, which was used to produce a portion of the clinical trial supplies for our Phase 3 clinical trials of lumacaftor in combination with ivacaftor, and are in the process of establishing continuous manufacturing capabilities and seeking validation for these capabilities at our new facility located in Boston, Massachusetts. We are upgrading the continuous manufacturing process at our third-party manufacturer and are scheduled to begin producing co-formulated lumacaftor and ivacaftor intended for commercial use in mid-2014. Continuous process manufacturing connects the processes used in traditional batch manufacturing and uses on-line monitoring in order to increase control of the manufacturing process. While we believe continuous process manufacturing has a number of benefits, we have not previously designed a continuous manufacturing process to produce commercial quantities of a pharmaceutical product, and we believe that we would be the first company to seek approval for an NDA or an MAA using this method of manufacturing. As a result, we also have designed and tested a

54

non-continuous process for manufacturing co-formulated lumacaftor and ivacaftor tablets that we would seek to utilize if we experience delays associated with the continuous manufacturing process.

Operations

We are moving our corporate headquarters from a number of buildings in Cambridge, Massachusetts into our new facility in Boston, Massachusetts. A majority of our Massachusetts-based employees were relocated to our new corporate headquarters in January 2014. We expect to complete the relocation of our Massachusetts-based employees to our new facilities in the first half of 2014. This move allows us to consolidate our headquarters into one campus and update our physical infrastructure, including our laboratories and other research facilities.  In order to manage the expansion of our international operations and move to our new headquarters, we will need to enhance our cross-functional operational, financial and management processes while continuing to attract and maintain highly skilled employees. We are decommissioning our existing laboratory facilities at our Cambridge locations. We expect to incur restructuring charges related to lease obligations for facilities in Cambridge through 2018, with the majority of these charges being incurred during 2014.

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RESULTS OF OPERATIONS

										2013/2012 Comparison					2012/2011 Comparison
										Increase/(Decrease)					Increase/(Decrease)
	2013			2012			2011			$			%		$		%
	(in thousands)									(in thousands, except percentages)
Revenues	$	1,211,975		$	1,527,042		$	1,410,626		$	(315,067	)	(21	)%	$	116,416	8	%
Operating costs and expenses	2,115,423			1,524,710			1,296,806			590,713			39	%	227,904		18	%
Other income (loss), net	215,898			(53,467		)	(72,641		)	n/a			n/a		19,174		26	%
Net loss (income) attributable to noncontrolling interest (Alios)	242,522			(55,897		)	(11,605		)	n/a			n/a		44,292		382	%
Net income (loss) attributable to Vertex	$	(445,028	)	$	(107,032	)	$	29,574		(337,996		)	(316	)%	n/a		n/a

Net Income (Loss) Attributable to Vertex

Net income (loss) attributable to Vertex, revenues and operating expenses have been affected by rapidly fluctuating INCIVEK and KALYDECO net revenues and significant intangible asset impairment charges and inventory write-offs during the three year period ended December 31, 2013. In 2014, we expect most of our revenues will be due to KALYDECO sales and that we will incur a substantial net loss.

Comparison of Net Income (Loss) Attributable to Vertex 2013 vs. 2012

Net loss attributable to Vertex was $445.0 million in 2013 compared to net loss attributable to Vertex of $107.0 million in 2012. Our revenues decreased in 2013 as compared to 2012 due to a $695.5 million decrease in INCIVEK revenues partially offset by a $199.6 million increase in KALYDECO revenues and a $165.7 million increase in collaborative revenues. Our operating costs and expenses increased in 2013 as compared to 2012 primarily due to an aggregate of $663.5 million in intangible asset impairment charges related to VX-222 and VX-135 and a $112.6 million increase in research and development expenses, partially offset by a $74.5 million decrease in sales, general and administrative expenses and an aggregate of $133.2 million in cost of product revenues due to charges for excess and obsolete INCIVEK inventories that we incurred in 2012.

In 2013, the deconsolidation of Alios resulted in a gain of $68.2 million attributable to Vertex. The $68.2 million gain is approximately equal to the difference between (i) losses we recorded in 2011 and 2012 based on increases in the fair value of contingent milestone payments and royalties payable by us to Alios and (ii) the aggregate of $120.0 million in upfront and milestone payments that we made to Alios. In 2012, the fair value of contingent milestone and royalty payments payable by us to Alios increased by $115.0 million, which increased net loss attributable to Vertex in 2012 on a dollar-for-dollar basis.

Comparison of Net Income (Loss) Attributable to Vertex 2012 vs. 2011

Net loss attributable to Vertex was $107.0 million in 2012 compared to net income attributable to Vertex of $29.6 million in 2011. Our revenues increased in 2012 as compared to 2011 due to a $210.9 million increase in INCIVEK net product revenues and a $171.6 million increase in KALYDECO net product revenues, partially offset by a significant decrease in collaborative revenues. Our operating costs and expenses increased in 2012 as compared to 2011 primarily due to a $98.5 million increase in research and development expenses, a $36.1 million increase in sales, general and administrative expenses and an aggregate of $133.2 million in cost of product revenues due to charges for excess and obsolete INCIVEK inventories that we incurred in 2012. These increases were partially offset by a $105.8 million intangible asset impairment charge in 2011 that had a net effect on net income attributable to Vertex of $73.1 million. In 2012 and 2011, the fair value of contingent milestone payments and royalties payable by us to Alios increased by $115.0 million and $70.0 million, respectively, which increased the net loss attributable to Vertex in 2012 and decreased net income attributable to Vertex in 2011 on a dollar-for-dollar basis.

Stock-based Compensation

Stock-based compensation expense was $127.3 million, $114.3 million and $118.2 million in 2013, 2012 and 2011, respectively.

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Net Income (Loss) Attributable to Vertex per Diluted Share

In 2013 and 2012, net loss attributable to Vertex was $1.98 and $0.50, respectively, per diluted share. In 2011, we had net income attributable to Vertex of $0.14 per diluted share.

Common Shares Outstanding

Our shares of outstanding common stock increased by 16.5 million shares from 217.3 million shares on December 31, 2012 to 233.8 million shares on December 31, 2013 due to our issuance in 2013 of approximately 8.3 million shares of common stock in connection with the conversions of our 2015 Notes and 8.2 million shares of common stock issued pursuant to our employee equity programs. Our shares of outstanding common stock increased by 8.0 million shares from 209.3 million shares on December 31, 2011 to 217.3 million shares on December 31, 2012 as a result of shares issued pursuant to our employee equity programs.

Revenues

							2013/2012 Comparison					2012/2011 Comparison
							Increase/(Decrease)					Increase/(Decrease)
	2013		2012		2011		$			%		$			%
	(in thousands)						(in thousands, except percentages)
Product revenues, net	$	837,645	$	1,333,458	$	950,889	$	(495,813	)	(37	)%	$	382,569		40	%
Royalty revenues	156,592		141,498		50,015		15,094			11	%	91,483			183	%
Collaborative revenues	217,738		52,086		409,722		165,652			318	%	(357,636		)	(87	)%
Total revenues	$	1,211,975	$	1,527,042	$	1,410,626	$	(315,067	)	(21	)%	$	116,416		8	%

Product Revenues, Net

	2013		2012		2011
	(in thousands)
INCIVEK	$	466,360	$	1,161,813	$	950,889
KALYDECO	371,285		171,645		—
Total product revenues, net	$	837,645	$	1,333,458	$	950,889

Our total net product revenues decreased by 37% in 2013 as compared to 2012 due to decreased INCIVEK net product revenues, partially offset by increased KALYDECO net product revenues. Our total net product revenues increased by 40% in 2012 as compared to 2011 due to increased INCIVEK net product revenues and KALYDECO net product revenues in 2012 for which there were no comparable revenues in 2011. In 2014, we expect that total net product revenues will decline due to significant expected decreases in INCIVEK net product revenues, partially offset by expected increases in KALYDECO net product revenues.

Our KALYDECO net product revenues have increased on a quarterly basis since we began marketing KALYDECO in the first quarter of 2012. We believe that most patients with CF six years of age and older who have the G551D mutation in the United States and Europe have started treatment with KALYDECO. We expect that KALYDECO net product revenues will increase further in 2014 as a result of geographic expansion, including potentially obtaining public reimbursement for the cost of KALYDECO in Australia and/or Canada, and potential label expansions that could increase the number of patients with CF who are eligible for treatment with KALYDECO.

We began recognizing net product revenues from sales of INCIVEK in the second quarter of 2011. INCIVEK net product revenues have been declining on a quarterly basis since reaching a peak in the fourth quarter of 2011 and were $19.4 million in the fourth quarter of 2013. Our net product revenues from sales of INCIVEK declined steeply over the course of 2013, including a 77% decline in INCIVEK net product revenues in the fourth quarter of 2013 as compared to the third quarter of 2013. We expect INCIVEK net product revenues to continue to decrease due to increased competition from the two competitive direct-acting antiviral therapies for the treatment of HCV infection that were approved by the FDA in the fourth quarter of 2013.

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Royalty Revenues

Janssen obtained approval to market INCIVO in the European Union in the third quarter of 2011. Our royalty revenues increased by $15.1 million in 2013 as compared to 2012 principally due to a $13.1 millionincrease in royalty revenues from sales of INCIVO by Janssen. Our royalty revenues increased by $91.5 million in 2012 as compared to 2011 due to $117.6 million of revenues recognized in 2012 from sales of INCIVO by Janssen for which there were limited comparable revenues in 2011. Beginning in the first quarter of 2014, Janssen has a fully-paid license to market INCIVO in its territories, subject to continued payment of certain third-party royalties. In future periods, these third-party royalties will result in royalty revenues and corresponding offsetting royalty expenses. As a result, we expect our royalty revenues to decrease significantly in 2014 as compared to 2013. Mitsubishi Tanabe's license to market telaprevir in Japan is fully paid.

We recognized royalty revenues related to sales by GlaxoSmithKline of an HIV protease inhibitor that was discovered and developed pursuant to our collaboration with GlaxoSmithKline of $25.6 million, $23.9 million and $29.7 million in 2013, 2012 and 2011, respectively. We sold our rights to these HIV royalties in 2008 for a one-time cash payment of $160.0 million.

Collaborative Revenues

Our collaborative revenues have fluctuated significantly on an annual basis. This variability has been due to, among other things: the 2013 amendment of our collaboration agreement with Janssen that resulted in significant collaborative revenues in the fourth quarter of 2013; the recognition of significant milestone revenues from Janssen and Mitsubishi Tanabe in 2011; the 2009 amendment of our collaboration agreement with Mitsubishi Tanabe, which provided for an up-front payment that was recognized over the period from the third quarter of 2009 through the second quarter of 2012; and variable revenues we received from services we provided to Janssen and Mitsubishi Tanabe through our third-party manufacturing network.

The table presented below is a summary of our collaborative revenues for 2013, 2012 and 2011:

	2013			2012		2011
	(in thousands)
Collaborative revenues:
Janssen	$	203,437		$	16,178	$	274,393
CFFT	14,322			16,960		13,654
Mitsubishi Tanabe	—			18,879		121,675
Other	(21		)	69		—
Total collaborative revenues	$	217,738		$	52,086	$	409,722

We recognized $203.4 million in Janssen collaborative revenues in 2013, which were primarily attributable to the $152.0 million payment we received in the fourth quarter of 2013 pursuant to our amendment to the Janssen collaboration agreement. These collaborative revenues also included the acceleration of the remaining deferred revenues related to the up-front payment we received from Janssen in 2006.In 2011, we recognized $250.0 million in milestone revenues under our collaboration agreement with Janssen for which there were no corresponding milestone revenues in 2012 or 2013. As of December 31, 2013, there was $5.0 million in deferred revenues related to the Janssen collaboration. We do not expect to recognize significant collaborative revenues related to the Janssen collaboration in future periods.

In 2011, we recognized a $65.0 million commercial milestone payment from Mitsubishi Tanabe. In addition, from the beginning of 2011 through the first quarter of 2012, we recognized $9.6 million per quarter in collaborative revenues related to a one-time payment that we received from Mitsubishi Tanabe in 2009. In 2011 and the first half of 2012, we also recognized revenues related to manufacturing services we provided to Mitsubishi Tanabe through our third-party manufacturing network. We have not recognized any collaborative revenues from Mitsubishi Tanabe since the first half of 2012 and will not recognize any future collaborative revenues pursuant to our collaboration agreement with Mitsubishi Tanabe.

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Operating Costs and Expenses

							2013/2012 Comparison					2012/2011 Comparison
							Increase/(Decrease)					Increase/(Decrease)
	2013		2012		2011		$			%		$			%
	(in thousands)						(in thousands, except percentages)
Cost of product revenues	$	88,979	$	236,742	$	63,625	$	(147,763	)	(62	)%	$	173,117		272	%
Royalty expenses	41,298		43,143		16,880		(1,845		)	(4	)%	26,263			156	%
Research and development expenses	918,783		806,185		707,706		112,598			14	%	98,479			14	%
Sales, general and administrative expenses	362,342		436,796		400,721		(74,454		)	(17	)%	36,075			9	%
Restructuring expenses	40,521		1,844		2,074		38,677			2,097	%	(230		)	(11	)%
Intangible asset impairment charges	663,500		—		105,800		663,500			n/a		(105,800		)	(100	)%
Total costs and expenses	$	2,115,423	$	1,524,710	$	1,296,806	$	590,713		39	%	$	227,904		18	%

Cost of Product Revenues

Our cost of product revenues includes the cost of producing inventories that corresponded to product revenues for the reporting period, plus the third-party royalties payable on our net sales of INCIVEK and KALYDECO. In addition, cost of product revenues in 2013 and 2012 included an aggregate of $10.4 million and $133.2 million, respectively, in write-offs for excess and obsolete inventories.

Our cost of product revenues decreased in 2013 compared to 2012 as a result of decreased product revenues and the $133.2 million in charges for excess and obsolete INCIVEK inventories that we incurred in 2012. Our cost of product revenues increased in 2012 compared to 2011 due to our increased product revenues and the charges for excess and obsolete INCIVEK inventories that we incurred in 2012. As of December 31, 2013, we had $0.9 million in remaining INCIVEK inventories.

Royalty Expenses

Royalty expenses include third-party royalties payable upon net sales of telaprevir by our collaborators and royalty expenses related to a subroyalty payable to a third party on net sales of an HIV protease inhibitor sold by GlaxoSmithKline. Royalty expenses in 2013 decreased slightly as compared to 2012. Royalty expenses in 2012 increased compared to 2011 primarily due to increased third-party royalties payable on net sales of INCIVO by Janssen. Our royalty expenses in future periods will be dependent on our collaborators' net sales of telaprevir in their territories. Royalty expenses also include a subroyalty payable to a third party on net sales of an HIV protease inhibitor sold by GlaxoSmithKline. The subroyalty expense is offset by a corresponding amount of royalty revenues on sales by GlaxoSmithKline of an HIV protease inhibitor, the rights to which we sold to a third party in 2008.

Research and Development Expenses

							2013/2012 Comparison				2012/2011 Comparison
							Increase/(Decrease)				Increase/(Decrease)
	2013		2012		2011		$		%		$		%
	(in thousands)						(in thousands, except percentages)
Research expenses	$	252,989	$	235,588	$	216,903	$	17,401	7	%	$	18,685	9	%
Development expenses	665,794		570,597		490,803		95,197		17	%	79,794		16	%
Total research and development expenses	$	918,783	$	806,185	$	707,706	$	112,598	14	%	$	98,479	14	%

Our research and development expenses include internal and external costs incurred for research and development of our drugs and drug candidates. We do not assign our internal costs, such as salary and benefits, stock-based compensation expense, laboratory supplies and infrastructure costs, to individual drugs or drug candidates, because the employees within our research and development groups typically are deployed across multiple research and development programs. These internal costs are significantly greater than our external costs, such as the costs of services provided to us by clinical research

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organizations and other outsourced research, which we do allocate by individual program. All research and development costs for our drugs and drug candidates are expensed as incurred.

To date, we have incurred in excess of $6.4 billion in research and development expenses associated with drug discovery and development. The successful development of our drug candidates is highly uncertain and subject to a number of risks. In addition, the duration of clinical trials may vary substantially according to the type, complexity and novelty of the drug candidate and the disease indication being targeted. The FDA and comparable agencies in foreign countries impose substantial requirements on the introduction of therapeutic pharmaceutical products, typically requiring lengthy and detailed laboratory and clinical testing procedures, sampling activities and other costly and time-consuming procedures. Data obtained from nonclinical and clinical activities at any step in the testing process may be adverse and lead to discontinuation or redirection of development activities. Data obtained from these activities also are susceptible to varying interpretations, which could delay, limit or prevent regulatory approval. The duration and cost of discovery, nonclinical studies and clinical trials may vary significantly over the life of a project and are difficult to predict. Therefore, accurate and meaningful estimates of the ultimate costs to bring our drug candidates to market are not available.

Over the three year period ended December 31, 2013, costs related to our CF and HCV programs have represented the largest portion of our development costs. Any estimates regarding development and regulatory timelines for our drug candidates are highly subjective and subject to change. We expect data from a Phase 3 clinical development program to evaluate lumacaftor in combination with ivacaftor in mid-2014. If this clinical development program is successful, we plan to submit an NDA to the FDA and an MAA in the European Union in the second half of 2014. We cannot make a meaningful estimate when, if ever, our other clinical development programs will generate revenues and cash flows.

Research Expenses

							2013/2012 Comparison					2012/2011 Comparison
							Increase/(Decrease)					Increase/(Decrease)
	2013		2012		2011		$			%		$			%
	(in thousands)						(in thousands, except percentages)
Research Expenses:
Salary and benefits	$	86,499	$	78,488	$	76,355	$	8,011		10	%	$	2,133		3	%
Stock-based compensation expense	27,599		25,147		25,305		2,452			10	%	(158		)	(1	)%
Laboratory supplies and other direct expenses	46,173		40,005		35,641		6,168			15	%	4,364			12	%
Contractual services	23,600		21,471		13,213		2,129			10	%	8,258			62	%
Infrastructure costs	69,118		70,477		66,389		(1,359		)	(2	)%	4,088			6	%
Total research expenses	$	252,989	$	235,588	$	216,903	$	17,401		7	%	$	18,685		9	%

Over the past three years we have maintained a substantial investment in research activities resulting in a 7%increase in research expenses in 2013 as compared to 2012 and a 9%increase in research expenses in 2012 as compared to 2011. We expect to continue to invest in our research programs with a focus on identifying drug candidates for specialty markets.

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Development Expenses

							2013/2012 Comparison				2012/2011 Comparison
							Increase/(Decrease)				Increase/(Decrease)
	2013		2012		2011		$		%		$			%
	(in thousands)						(in thousands, except percentages)
Development Expenses:
Salary and benefits	$	170,042	$	147,574	$	126,441	$	22,468	15	%	$	21,133		17	%
Stock-based compensation expense	53,868		46,386		50,269		7,482		16	%	(3,883		)	(8	)%
Laboratory supplies and other direct expenses	47,794		36,585		33,588		11,209		31	%	2,997			9	%
Contractual services	244,778		217,406		149,033		27,372		13	%	68,373			46	%
Drug supply costs	38,767		14,044		34,133		24,723		176	%	(20,089		)	(59	)%
Infrastructure costs	110,545		108,602		97,339		1,943		2	%	11,263			12	%
Total development expenses	$	665,794	$	570,597	$	490,803	$	95,197	17	%	$	79,794		16	%

Our development expenses increased by $95.2 million, or 17%, in 2013 as compared to 2012 and by $79.8 million, or 16%, in 2012 as compared to 2011. The increases in 2013 compared to 2012 were principally due to the expansion of clinical development programs in cystic fibrosis, including the initiation of the Phase 3 program for the combination of lumacaftor and ivacaftor, and increased drug supply costs primarily related to lumacaftor. The increases in 2012 in comparison to 2011 were principally due to increases in headcount and the expansion of our development efforts as we completed the registration programs for ivacaftor, prepared the regulatory filings needed to obtain approval for ivacaftor and continued the development of our other drug candidates.

Sales, General and Administrative Expenses

							2013/2012 Comparison					2012/2011 Comparison
							Increase/(Decrease)					Increase/(Decrease)
	2013		2012		2011		$			%		$		%
	(in thousands)						(in thousands, except percentages)
Sales, general and administrative expenses	$	362,342	$	436,796	$	400,721	$	(74,454	)	(17	)%	$	36,075	9	%

Sales, general and administrative expenses decreased by 17% in 2013 compared to 2012, primarily due to decreased INCIVEK commercial expenses and our October 2013 restructuring activities, partially offset by increased KALYDECO commercial expenses. Sales, general and administrative expenses increased by 9% in 2012 compared to 2011, primarily due to the expansion of our global commercial organization to support the launch of KALYDECO in North America and Europe and increased INCIVEK marketing expenses. We expect that our sales, general and administrative expenses will decrease in 2014 as compared to 2013 due to decreased commercial support for INCIVEK.

Restructuring Expense

We reduced our workforce primarily related to commercial support of INCIVEK in the fourth quarter of 2013, and we recorded $39.0 million of restructuring charges related to these restructuring activities. We estimate that we will incur aggregate restructuring charges of approximately $2.0 million to $2.5 million in the future related to this restructuring. In 2013, we also began incurring restructuring charges related to the relocation of our corporate headquarters to Boston, Massachusetts from Cambridge, Massachusetts. These charges were not significant in 2013, but we expect to incur approximately $50.0 million in restructuring charges related to this relocation in 2014.

Prior to the third quarter of 2013, our restructuring expense primarily related to remaining lease obligations following restructuring activities in 2003. As of December 31, 2013, our accrued restructuring liability related to these lease obligations was $19.1 million. In 2013, 2012 and 2011, we recorded restructuring expense related to our 2003 restructuring activities of $0.4 million, $1.8 million and $2.1 million, respectively.

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Intangible Asset Impairment Charges

In 2013, we recorded a $412.9 million impairment charge related to VX-222, a non-nucleoside HCV polymerase inhibitor. In connection with this impairment charge, we recorded a credit of $127.6 million in our provision for income taxes, resulting in a net effect on net loss attributable to Vertex related to this impairment charge of $285.3 million in 2013. In 2013, we also recorded a $250.6 million impairment charge related to the HCV nucleotide analogue (VX-135) program and a benefit for income taxes of $102.1 million.

In 2011, we recorded a $105.8 million impairment charge related to VX-759, a non-nucleoside HCV polymerase inhibitor. In connection with this impairment charge, we recorded a credit of $32.7 million in our provision for income taxes resulting in a net effect on net income attributable to Vertex related to this impairment charge of $73.1 million in 2011.

There were no corresponding intangible asset impairment charges in 2012.

Other Income (Loss), Net

Interest Expense, Net

Net interest expense increased by $7.7 million, or 51%, in 2013 from $15.0 million in 2012. Net interest expense decreased by $22.7 million, or 60%, in 2012 from $37.7 million in 2011.

Other Income (Expense), Net

In 2013, we recorded net other expense of $49.9 million, primarily related to the deconsolidation of Alios. In 2011, we recorded net other expense of $15.7 million, primarily related to the embedded and free-standing derivatives associated with two financial transactions that we entered into in September 2009. Net other income in 2012 was approximately $0.3 million.

Provision for (Benefit from) Income Taxes

In 2013, we recorded a benefit from income taxes of $288.6 million. This benefit from income taxes was principally due to a benefit of $166.1 million attributable to noncontrolling interest (Alios) and a benefit of $127.6 million related to our impairment charge for the VX-222 intangible asset.

In 2012, we recorded a provision for income taxes of $38.8 million. This provision for income taxes was primarily due to a provision of $39.0 million attributable to noncontrolling interest (Alios).

In 2011, we recorded a provision for income taxes of $19.3 million. This provision for income taxes was due to a provision of $48.8 million attributable to noncontrolling interest (Alios) related to the accounting for the collaboration between Alios and us, partially offset by a benefit from income taxes of $32.7 million related to our impairment charge related to the VX-759 intangible asset.

Noncontrolling Interest (Alios)

A summary of net loss (income) attributable to noncontrolling interest (Alios) in 2013, 2012, and 2011 is as follows:

	2013			2012			2011
	(in thousands)
Loss before provision for (benefit from) income taxes	$	283,747		$	20,044		$	9,536
Decrease (increase) in fair value of contingent milestone and royalty payments	124,920			(114,970		)	(69,950		)
Provision for (benefit from) income taxes	(166,145		)	39,029			48,809
Net loss (income) attributable to noncontrolling interest (Alios)	$	242,522		$	(55,897	)	$	(11,605	)

In 2013, the impairment charge related to VX-135 and related tax credit and the decrease in fair value of the contingent milestone payments and royalties payable by us to Alios of $124.9 million resulted in a net loss attributable to Alios of $242.5 million.

The fair value of the contingent milestone payments and royalties payable by us to Alios increased by $115.0 million and $70.0 million, in 2012 and 2011, respectively, due to the advancement of our HCV nucleotide analogue program. Increases

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in the fair value of the contingent milestone payments and royalties payable by us to Alios resulted in a decrease in net income attributable to Vertex (or an increase in net loss attributable to Vertex) on a dollar-for-dollar basis.

LIQUIDITY AND CAPITAL RESOURCES

As of December 31, 2013 we had cash, cash equivalents and marketable securities of approximately $1.47 billion, which represented an increase of $143.9 million from approximately $1.32 billion as of December 31, 2012. This increase was due to cash receipts from product sales and royalties, the $152.0 million payment we received from Janssen in the fourth quarter of 2013 and $265.9 million in cash we received from issuances of common stock pursuant to employee benefit plans, partially offset by cash expenditures we made during 2013 related to, among other things, research and development expenses and sales, general and administrative expenses, approximately $64.8 million in build-out costs for our new corporate headquarters, and $135.0 million for capital expenditures for property and equipment. In addition, in 2013, we began supporting $31.9 million in irrevocable stand-by letters of credit issued in support of property leases and other similar agreements with an unsecured credit facility with a one-year term. We previously had cash-collateralized these stand-by letters of credit. As a result of this credit facility, our restricted cash decreased by $31.8 million net of other activity recorded during 2013 and our cash and cash equivalents increased by a corresponding amount.

As of December 31, 2012, we had $400.0 million in aggregate principal amount of 2015 Notes. In addition to the $400.0 million in aggregate principal amount, which was scheduled to mature on October 1, 2015, we were scheduled to make interest payments in an aggregate amount of $33.5 million during the period from June 30, 2013 through October 1, 2015. In the second quarter of 2013, we called the 2015 Notes for redemption. In response, the holders of the 2015 Notes converted their notes into 8.2 million shares of our common stock and received an additional 0.1 million shares of our common stock to compensate them for the semi-annual interest payment that would have been payable on October 1, 2013. As of December 31, 2013, we had no 2015 Notes outstanding and our future cash commitments have been reduced by the $400.0 million in aggregate principal of the 2015 Notes plus the associated future interest payments.

Sources of Liquidity

We intend to rely on cash flows from product sales as our primary source of liquidity. Our cash flows from product sales have been decreasing in recent periods and, beginning in 2014, we will no longer receive cash flows from royalties based on sales of INCIVO by Janssen. Our near-term cash flows from product sales will be dependent on continued sales of KALYDECO, the outcomes of our reimbursement discussions with regulatory authorities in Australia and Canada, the outcomes of ongoing label-expansion programs for ivacaftor and the Phase 3 clinical trials of lumacaftor in combination with ivacaftor. In recent periods, we also have received significant proceeds from the issuance of common stock under our employee benefit plans, but the amount and timing of future proceeds from employee benefits plans is uncertain. Other possible sources of liquidity include strategic collaborative agreements that include research and/or development funding, commercial debt, public and private offerings of our equity and debt securities, development milestones and royalties on sales of products, software and equipment leases, strategic sales of assets or businesses and financial transactions.

Future Capital Requirements

We are incurring substantial operating expenses to conduct research and development activities and operate our organization. In addition, we have substantial facility and capital lease obligations, including leases for two buildings in Boston, Massachusetts that continue through 2028.

We expect that cash flows from our products together with our current cash, cash equivalents and marketable securities will be sufficient to fund our operations for at least the next twelve months. The adequacy of our available funds to meet our future operating and capital requirements will depend on many factors, including the amounts of future revenues generated by our products and the potential introduction or one or more of our other drug candidates to the market, and the number, breadth, cost and prospects of our research and development programs.

Financing Strategy

Although we do not have any plans to do so in the near term, we may raise additional capital through public offerings or private placements of our securities. In addition, we may raise additional capital through securing new collaborative agreements or other methods of financing. We will continue to manage our capital structure and to consider all financing opportunities, whenever they may occur, that could strengthen our long-term liquidity profile. There can be no assurance that any such financing opportunities will be available on acceptable terms, if at all.

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CONTRACTUAL COMMITMENTS AND OBLIGATIONS

The following table sets forth our commitments and obligations as of December 31, 2013:

	Payments Due by Period
	2014		2015-2016		2017-2018		2019 and later		Total
	(in thousands)
Fan Pier Leases	$	67,206	$	134,412	$	134,412	$	752,798	$	1,088,828
Facility operating leases, excluding Fan Pier Leases	60,641		87,590		52,341		75,344		275,916
Capital lease obligations	19,957		30,155		21,326		2,121		73,559
Research, development and drug supply costs	17,617		—		—		—		17,617
Other	6,760		5,040		84		—		11,884
Total contractual commitments and obligations	$	172,181	$	257,197	$	208,163	$	830,263	$	1,467,804

Leases

In 2011, we entered into leases for two buildings that were constructed at Fan Pier in Boston, Massachusetts during the period from 2011 through 2013. These two buildings became our corporate headquarters in January 2014. We commenced lease payments in December 2013 and the initial lease periods end in December 2028.

Our future minimum commitments under our Kendall Square lease are included in "Facility operating leases, excluding Fan Pier Leases." We have entered into two subleases for a portion of the rentable square footage at the Kendall Square facility to offset our on-going contractual lease obligations. The future minimum committed income from the subleases is $8.5 million for 2014 and $4.0 million for 2015. These amounts are not offset against our obligations set forth in the table above. See Note R, "Restructuring Expenses," to our consolidated financial statements for further information.

The table also reflects leases of equipment, leasehold improvements and software licenses that are accounted for as capital leases.

Research, Development and Drug Supply Costs

"Research, development and drug supply costs," does not include certain payments we are obligated to make to clinical research organizations, or CROs because these contracts are cancelable, at our option, with notice. However, we historically have not cancelled such contracts. As of December 31, 2013, we had accrued $30.8 million related to these contracts for costs incurred for services provided through December 31, 2013, and we have approximately $139.9 million in cancelable future commitments based on existing contracts as of December 31, 2013. These amounts reflect planned expenditures based on existing contracts and do not reflect any future modifications to, or terminations of, existing contracts or anticipated or potential new contracts.

Collaborative Arrangements

We have entered into certain research and development collaboration agreements with third parties that include the funding of certain development, manufacturing and commercialization efforts with the potential for future milestone and royalty payments by us upon the achievement of pre-established developmental, regulatory and/or commercial targets. Our obligation to fund these efforts is contingent upon continued involvement in the programs and/or the lack of any adverse events that could cause the discontinuance of the programs. Pursuant to our collaboration with Alios, Alios is eligible to receive development milestone payments from us of up to $312.5 million if VX-135 is approved and commercialized. As of December 31, 2013, Alios had earned $60.0 million of these milestone payments, all of which had been paid as of December 31, 2013. Alios also is eligible to receive commercial milestone payments from us of up to $750.0 million, as well as tiered royalties on net sales of approved drugs. We also have royalty and milestone obligations to the Cystic Fibrosis Foundation Therapeutics Incorporated. Contingent payments under these agreements become due and payable only upon achievement of certain milestones and are not included in the contractual obligations table above.

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Tax-related Obligations

We exclude liabilities pertaining to uncertain tax positions from our summary of contractual obligations as we cannot make a reliable estimate of the period of cash settlement with the respective taxing authorities. As of December 31, 2013, we have $2.0 million of liabilities associated with uncertain tax positions. As of December 31, 2013, we cannot reasonably estimate the amount we expect to pay within the next twelve months in connection with such settlements.

Other Funding Commitments

Our table detailing contractual commitments and obligations does not include severance payment obligations to certain of our executive officers in the event of a not-for-cause employment termination under existing employment contracts. We provide information regarding these obligations annually in our proxy statement for our annual meeting of shareholders.

CRITICAL ACCOUNTING POLICIES AND ESTIMATES

Our discussion and analysis of our financial condition and results of operations is based upon our consolidated financial statements prepared in accordance with generally accepted accounting principles in the United States. The preparation of these financial statements requires us to make certain estimates and assumptions that affect the reported amounts of assets and liabilities, the disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reported periods. These items are monitored and analyzed by management for changes in facts and circumstances, and material changes in these estimates could occur in the future. Changes in estimates are reflected in reported results for the period in which the change occurs. We base our estimates on historical experience and various other assumptions that we believe to be reasonable under the circumstances. Actual results may differ from our estimates if past experience or other assumptions do not turn out to be substantially accurate.

We believe that our application of the following accounting policies, each of which requires significant judgments and estimates on the part of management, are the most critical to aid in fully understanding and evaluating our reported financial results:

• revenue recognition;

• intangible assets;

• consolidation and deconsolidation of variable interest entity;

• accruals;

• commercial supplies and inventories;

• income taxes; and

• leases.

Our accounting policies, including the ones discussed below, are more fully described in the Notes to our consolidated financial statements, including Note A, "Nature of Business and Accounting Policies," included in this Annual Report on Form 10-K.

Revenue Recognition

Product Revenues, Net

We generate product revenues from sales in the United States and in international markets. We sell our products principally to a limited number of major and selected regional wholesalers and specialty pharmacy providers in North America as well as government-owned and supported customers in international markets, collectively, our customers. Our customers in North America subsequently resell our products to patients and health care providers. Separately, we have arrangements with numerous third-party payors in North America that provide for government-mandated and privately-negotiated rebates, chargebacks and discounts. We recognize net product revenues from sales of our products upon delivery to our customers as long as:

• there is persuasive evidence that an arrangement exists between us and our customer;

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• collectability is reasonably assured; and

• the price is fixed or determinable.

In order to conclude that the price is fixed or determinable, we must be able to calculate our gross product revenues from our customers and reasonably estimate our net product revenues. Our gross product revenues are based on the fixed price for our products that we charge our customers. We estimate our net product revenues by deducting from our gross product revenues (i) trade allowances, such as invoice discounts for prompt payment and customer fees, (ii) estimated government and private payor rebates, chargebacks and discounts, (iii) estimated reserves for expected product returns and (iv) estimated costs of incentives offered to certain indirect customers, including patients. We make significant estimates and judgments that materially affect our recognition of net product revenues. Changes in our estimates of net product revenues could have a material effect on net product revenues recorded in the period in which we determine that change occurs.

In certain instances, we may be unable to reasonably conclude that the price is fixed or determinable at the time of delivery, in which case we defer the recognition of revenues. Once we are able to determine that the price is fixed or determinable, we recognize the revenues associated with the units in which revenue recognition was deferred.

The value of the rebates, chargebacks and discounts provided to third-party payors per course of treatment vary significantly and are based on government-mandated discounts and our arrangements with other third-party payors. Typically, government-mandated discounts in the United States and Canada are significantly larger than discounts provided to other third-party payors. In order to estimate our total rebates, chargebacks and discounts, we estimate the percentage of prescriptions that will be covered by each third-party payor, which is referred to as the payor mix. We track available information regarding changes, if any, to the payor mix for our products, to our contractual terms with third-party payors and to applicable governmental programs and regulations and levels of our products in the distribution channel. We adjust our estimated rebates, chargebacks and discounts based on new information, including information regarding actual rebates, chargebacks and discounts for our products, as it becomes available. Claims by third-party payors for rebates, chargebacks and discounts frequently are submitted to us significantly after the related sales, potentially resulting in adjustments in the period in which the new information becomes known. If we increased our estimate of the percentage of patients receiving our products covered by third-party payors entitled to government-mandated discounts by two percentage points, our net product revenues would decrease by less than one percent for the three months ended December 31, 2013.

Our customers generally have the right to return unopened unprescribed packages subject to contractual limitations. To date returns have been minimal and, based on inventory levels held by our customers and our distribution model, we believe that returns of products will continue to be minimal. We track actual returns by individual production lots and will continue to monitor inventory levels in the distribution channel. If necessary, we will adjust our estimated product returns based on new information as it becomes available.

Collaborative Revenues

We recognize revenues generated through collaborative research, development and/or commercialization agreements. The terms of these agreements typically include payment to us of one or more of the following: nonrefundable, up-front license fees; development and commercial milestone payments; funding of research and/or development activities; payments for services we provide through our third-party manufacturing network; and royalties on net sales of licensed products. Each of these types of payments results in collaborative revenues, except for revenues from royalties on net sales of licensed products, which are classified as royalty revenues.

For each collaborative research, development and/or commercialization agreement that results in revenues, we determine (i) whether multiple deliverables exist, (ii) whether the undelivered elements have value to the customer on a stand-alone basis, (iii) how the deliverables should be separated and (iv) how the consideration should be allocated to the deliverables. For arrangements entered into or materially modified after January 1, 2011, we allocate consideration in an arrangement using the relative selling price method based on our best estimate of selling price of deliverables if we do not have vendor-specific objective evidence or third-party evidence. As part of the accounting for these agreements, we must develop assumptions that require judgment to determine the best estimate of selling price. We utilize key assumptions to determine the best estimate of selling price, which may include patient enrollment requirements from regulatory authorities, development timelines, reimbursement rates for personnel costs, discount rates, and estimated third-party development costs.

In the fourth quarter of 2013, we amended our collaboration agreement with Janssen, and were required to make significant estimates regarding (i) the determination of whether or not the agreement was materially modified and (ii) the

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estimated selling price for the remaining telaprevir development activities. We recognized $182.4 million of collaborative revenues pursuant to the collaboration agreement in the fourth quarter of 2013. This amount was primarily attributable to (i) the new consideration received from Janssen, including the $152.0 million fourth quarter 2013 payment and the remaining deferred revenues related to the 2006 up-front payment less (ii) our best estimate of selling price for the remaining telaprevir development activities. As of December 31, 2013, the remaining deferred revenue balance related to Janssen was $5.0 million, which will be recognized as collaborative revenues as telaprevir development program activities are completed.

Intangible Assets

We maintain an indefinite-lived in-process research and development asset on our consolidated balance sheet until either the research and development project underlying it is completed or the asset becomes impaired. When we determine that an asset has become impaired or we abandon a project, we write down the carrying value of the related intangible asset to its fair value and take an impairment charge in the period in which the impairment occurs.

We assess the fair value of assets, including intangible assets such as in-process research and development assets, using a variety of methods, including present-value models that are based upon multiple probability-weighted scenarios involving the development and potential commercialization of the acquired drug candidates. The present-value models require us to make significant assumptions regarding the estimates that market participants would make in evaluating a drug candidate, including the probability of successfully completing clinical trials and obtaining regulatory approval to market the drug candidate, the timing of and the expected costs to complete in-process research and development projects, future net cash flows from potential drug sales, which are based on estimates of the sales price of the drug, the number of patients who will be diagnosed and treated and our competitive position in the marketplace, and appropriate discount and tax rates.

We test our intangible assets for impairment on an annual basis as of October 1, and more frequently if indicators are present or changes in circumstance suggest that impairment may exist. Events that could result in an impairment, or trigger an interim impairment assessment, include the receipt of additional clinical or nonclinical data regarding our drug candidate or a potentially competitive drug candidate, changes in the clinical development program for a drug candidate or new information regarding potential sales for the drug. In connection with each annual impairment assessment and any interim impairment assessment, we compare the fair value of the asset as of the date of the assessment with the carrying value of the asset on our consolidated balance sheet.

In 2013, we incurred intangible asset impairment charges totaling $663.5 million that all related to drug candidates for the treatment of HCV infection. As of December 31, 2013, we had no intangible assets.

ViroChem Acquisition

As of December 31, 2010, the intangible assets acquired from ViroChem that were reflected on our consolidated balance sheet related to two drug candidates, VX-222 and VX-759. VX-222 and VX-759 had estimated fair values on the acquisition date and December 31, 2010 of $412.9 million and $105.8 million, respectively. The estimated fair values ascribed to VX-222 and VX-759 on the acquisition date were based on the estimated fair value that would have been ascribed to each of these drug candidates by a market participant that acquired both drug candidates in a single transaction.

In the third quarter of 2011, we recorded a $105.8 million intangible asset impairment charge related to VX-759 and in the first quarter of 2013, we recorded a $412.9 million intangible asset impairment charge related to VX-222. The timing of these impairment charges were based on changes in our estimates regarding the potential to develop these assets and the competitive landscape, which were reflected in the reported results for the period in which they became known.

Alios Collaboration

We recorded $250.6 million of intangible assets on our consolidated balance sheet based on our estimate of the fair value of Alios' HCV nucleotide analogue program as of June 13, 2011 and made significant estimates regarding: the probability of obtaining regulatory approval of an HCV nucleotide analogue; the timing and expected costs of clinical trials and other development activities; future potential cash flows from sales of drugs and the appropriate discount and tax rates. In the fourth quarter of 2013, a $250.6 million intangible asset impairment charge related to the HCV nucleotide analogue (VX-135) program was recorded. The timing of this impairment charge was based on changes in our estimates regarding the potential to develop this asset and the competitive landscape, which were reflected in our reported results in the period in which they became known.

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Consolidation and Deconsolidation of Variable Interest Entity

In 2011, we entered into an agreement with Alios pursuant to which we agreed to collaborate on the research, development and commercialization of ALS-2200 (now formulated as VX-135) and ALS-2158, two HCV nucleotide analogues discovered by Alios. In 2012, we received data from Phase 1 clinical trials in which Alios evaluated ALS-2200 and ALS-2158. Based on data from these clinical trials, we ended all development activities related to ALS-2158 and continued to develop VX-135. We are responsible for all expenses related to the development and commercialization of VX-135. We paid Alios a $60.0 million up-front payment in connection with the execution of the agreement and $60.0 million in milestone payments through December 31, 2013. Alios is eligible to receive research and development milestone payments, commercial milestone payments and tiered royalties on net sales of any approved drugs licensed by us under the collaboration agreement. Our interests in Alios are limited to those accorded to us pursuant to our collaboration agreement with Alios, and we have no equity interest, or right to acquire any equity interest, in Alios. In addition to Alios’ activities related to HCV nucleotide analogues, Alios is engaged in separate programs directed at developing novel drugs.

Our collaboration with Alios requires us to apply accounting policies that involve significant judgments and that have a material effect on our consolidated financial statements. Under applicable accounting guidance, as a result of the relationship established through the collaboration agreement, Alios was deemed to be a variable interest entity, or VIE, our license to ALS-2200 (VX-135) and ALS-2158 was deemed to be a variable interest in Alios as a whole, and we were deemed to be Alios' primary beneficiary. As a result, we were required to consolidate Alios’ financial statements into our financial statements for the period from June 2011 through December 31, 2013. As a result of the impairment of our HCV nucleotide analogue program in the fourth quarter of 2013, we determined that we no longer had a variable interest in Alios as a whole and deconsolidated Alios effective as of December 31, 2013.

We believe that the following effects of the consolidation and deconsolidation of Alios on our consolidated financial statements are the most significant:

• In 2013, the deconsolidation of Alios resulted in a gain of $68.2 million attributable to Vertex. The $68.2 million gain is approximately equal to the difference between (i) losses we recorded in 2011 and 2012 based on increases in the fair value of contingent milestone payments and royalties payable by us to Alios and (ii) the aggregate of $120.0 million in up-front and milestone payments that we made to Alios pursuant to the Alios collaboration.

• In each period, we recorded net loss (income) attributable to the Alios noncontrolling interest. This net loss (income) reflected Alios’ net loss (income) for the period as adjusted for gains and losses in the fair value of the contingent milestone payments and royalties payable by us to Alios. Determining the fair value of the contingent milestone payments and royalties payable by us to Alios required us to make significant estimates regarding the probability and potential timing of achieving each of the milestones pursuant to the agreement, future potential net sales of the HCV nucleotide analogues licensed from Alios and appropriate discount and tax rates. We based our estimate of the probability of achieving the relevant milestones on industry data for similar assets and our own experience. The discount rates used in the valuation model represented a measure of credit risk associated with settling the liability. Significant judgment was used in determining the appropriateness of these assumptions at each reporting period. Increases in 2011 and 2012 in the fair value of the contingent milestone payments and royalties payable by us to Alios resulted in a decrease in net income attributable to Vertex (or an increase in net loss attributable to Vertex) on a dollar-for-dollar basis.

• From June 2011 through December 31, 2013, we consolidated all of Alios’ expenses and revenues into our consolidated statements of operations, eliminating all intercompany balances and transactions. As of December 31, 2013, our consolidated balance sheet excludes Alios' balances.

• We continue to have significant involvement with Alios due to the Alios agreement; therefore, the deconsolidation of Alios does not qualify for discontinued operations presentation in our consolidated financial statements as of December 31, 2013. We will evaluate whether we continue to have significant involvement with Alios for a period of one year from the December 31, 2013 deconsolidation date. If we determine that we no longer have significant continuing involvement with Alios during the year following the deconsolidation of Alios, we will retroactively adjust our consolidated financial statements to reflect discontinued operations presentation.

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Accruals

Research and development expenses, including amounts funded through research and development collaborations, and sales, general and administrative expenses are expensed as incurred. When third-party service providers' billing terms do not coincide with our period-end, we are required to make estimates of our obligations to those third parties, including clinical trial and pharmaceutical development costs, contractual services costs, costs for drug supply, marketing expenses and infrastructure expenses incurred in a given accounting period and record accruals at the end of the period. We base our estimates on our knowledge of the research and development programs, services performed for the period, past history for related activities and the expected duration of the third-party service contract, where applicable.

Commercial Supplies and Inventories

We began capitalizing the costs of our INCIVEK inventories on January 1, 2011 and the costs of our KALYDECO inventories on January 1, 2012. We capitalize inventories produced in preparation for initiating sales of a drug candidate when the related drug candidate is considered to have a high likelihood of regulatory approval and the related costs are expected to be recoverable through sale of the inventories. In determining whether or not to capitalize such inventories, we evaluate, among other factors, information regarding the drug candidate's safety and efficacy, the status of regulatory submissions and communications with regulatory authorities and the outlook for commercial sales, including the existence of current or anticipated competitive drugs and the availability of reimbursement. In addition, we evaluate risks associated with manufacturing the drug candidate and the remaining shelf life of the inventories. After we begin capitalizing inventories, we perform an assessment of the recoverability of capitalized inventory during each reporting period, and write down any excess and obsolete inventories to their net realizable value in the period in which the impairment is first identified.

Treatment of HCV infection is a highly competitive field characterized by rapid technological advances. In 2013 and 2012, following periodic assessments of the recoverability of our inventories, we recorded within cost of product revenues an aggregate of $10.4 million and $133.2 million, respectively in charges primarily related to excess and obsolete INCIVEK inventories based on our analysis of our INCIVEK inventory levels in relation to our commercial outlook for INCIVEK. Periodic assessments of the recoverability of capitalized costs involve significant estimates and judgments on the part of management. As of December 31, 2013, we had $0.9 million in remaining INCIVEK inventories.

Income Taxes

We maintain a valuation allowance on our net operating losses and other deferred tax assets because we have an extended history of annual losses. Our U.S. federal net operating loss carryforwards totaled approximately $2.7 billion as of December 31, 2013. On an annual basis, we reassess the valuation allowance for deferred income tax assets. After consideration of all the evidence, both positive and negative, we continue to maintain a valuation allowance on the deferred tax asset as of December 31, 2013 because it is more likely than not that the deferred tax asset will not be realized. In future periods, if we determine that it is more likely than not that the deferred tax asset will be realized, (i) the valuation allowance would be decreased, (ii) a portion or all of the deferred tax asset would be reflected on our consolidated balance sheet and (iii) we would record non-cash benefits in our consolidated statements of operations related to the reflection of the deferred tax asset on our consolidated balance sheet.

Leases

In 2011, we entered into two leases for our corporate headquarters. Our corporate headquarters were built during the period from 2011 through December 2013. We lease our corporate headquarters pursuant to leases that expire in 2028, subject to our right to extend the leases for an additional 10 years. Because we were involved in the construction project, we were deemed for accounting purposes to be the owner of the buildings during the construction period. Accordingly, we recorded project construction costs incurred by the landlord as an asset and a related financing obligation in “Property and equipment, net” and “Construction financing lease obligation,” respectively, on our consolidated balance sheets.

We evaluated the leases in the fourth quarter of 2013 and determined that the leases did not meet the criteria for “sale-leaseback” treatment. Accordingly, we began depreciating the asset and incurring interest expense related to the financing obligation during the fourth quarter of 2013. We bifurcate our lease payments pursuant to the leases into (i) a portion that is allocated to the buildings and (ii) a portion that is allocated to the land on which the buildings were constructed. The portion of the lease obligations allocated to the land is treated as an operating lease that commenced in 2011. In connection with the leases for our corporate headquarters, in 2014, we expect to incur approximately $60.0 million in interest expense, $14.0 million in depreciation expense and $6.5 million in operating expenses.

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RECENT ACCOUNTING PRONOUNCEMENTS

Refer to Note A, "Nature of Business and Accounting Policies," in the accompanying notes to the consolidated financial statements for a discussion of recent accounting pronouncements. There were no new accounting pronouncements adopted during 2013 that had a material effect on our financial statements.

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

As part of our investment portfolio, we own financial instruments that are sensitive to market risks. The investment portfolio is used to preserve our capital until it is required to fund operations, including our research and development activities. None of these market risk-sensitive instruments are held for trading purposes. We do not have derivative financial instruments in our investment portfolio.

Interest Rate Risk

We invest our cash in a variety of financial instruments, principally securities issued by the U.S. government and its agencies, investment-grade corporate bonds and commercial paper, and money market funds. These investments are denominated in U.S. dollars. All of our interest-bearing securities are subject to interest rate risk and could decline in value if interest rates fluctuate. Substantially all of our investment portfolio consists of marketable securities with active secondary or resale markets to help ensure portfolio liquidity, and we have implemented guidelines limiting the term-to-maturity of our investment instruments. Due to the conservative nature of these instruments, we do not believe that we have a material exposure to interest rate risk.

Foreign Exchange Market Risk

As a result of our foreign operations, we face exposure to movements in foreign currency exchange rates, primarily the Euro, Swiss Franc, British Pound, Australian Dollar and Canadian Dollar against the U.S. dollar. The current exposures arise primarily from cash, accounts receivable, intercompany receivables, payables and inventories. Both positive and negative affects to our net revenues from international product sales from movements in foreign currency exchange rates are partially mitigated by the natural, opposite affect that foreign currency exchange rates have on our international operating costs and expenses.

In December 2013, we implemented a foreign currency management program with the objective of reducing the impact of exchange rate fluctuations on our operating results and forecasted revenues and expenses denominated in foreign currencies. The change in fair value of these foreign currency forward contracts included in accumulated other comprehensive loss and the gross fair value of foreign currency forward assets and liabilities included on the consolidated balance sheet as of December 31, 2013 were not material.

ITEM 8. FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

The information required by this Item 8 is contained on pages F-1 through F-45 of this Annual Report on Form 10-K.

ITEM 9. CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

Not applicable.

ITEM 9A. CONTROLS AND PROCEDURES

(1) Evaluation of Disclosure Controls and Procedures. The Company’s chief executive officer and chief financial officer, after evaluating the effectiveness of the Company’s disclosure controls and procedures (as defined in Rule 13a-15(e) and Rule 15d-15(e) promulgated under the Securities Exchange Act of 1934, as amended) as of the end of the period covered by this Annual Report on Form 10-K, have concluded that, based on such evaluation, the Company’s disclosure controls and procedures were effective. In designing and evaluating the disclosure controls and procedures, the Company’s management recognized that any controls and procedures, no matter how well designed and operated, can provide only reasonable assurance of achieving the desired control objectives, and the Company’s management necessarily was required to apply its judgment in evaluating the cost-benefit relationship of possible controls and procedures.

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(2) Management’s Annual Report on Internal Control Over Financial Reporting. The management of the Company is responsible for establishing and maintaining adequate internal control over financial reporting. Internal control over financial reporting is defined in Rule 13a-15(f) and Rule 15d-15(f) promulgated under the Securities Exchange Act of 1934, as amended, as a process designed by, or under the supervision of, the Company’s principal executive and principal financial officers and effected by the Company’s Board of Directors, management and other personnel, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. The Company’s internal control over financial reporting includes those policies and procedures that:

• pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the Company;

• provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the Company are being made only in accordance with authorizations of management and directors of the Company; and

• provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use or disposition of the Company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

The Company’s management assessed the effectiveness of the Company’s internal control over financial reporting as of December 31, 2013. In making this assessment, it used the criteria set forth in the Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (1992 framework)(COSO). Based on its assessment, the Company’s management has concluded that, as of December 31, 2013, the Company’s internal control over financial reporting is effective based on those criteria.

The Company’s independent registered public accounting firm, Ernst & Young LLP, issued an attestation report on the Company’s internal control over financial reporting. See Section 4 below.

(3) Changes in Internal Controls. During the quarter ended December 31, 2013, there were no changes in the Company's internal control over financial reporting that materially affected, or are reasonably likely to materially affect, the Company's internal control over financial reporting.

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(4) Report of Independent Registered Public Accounting Firm

The Board of Directors and Shareholders of

Vertex Pharmaceuticals Incorporated

We have audited Vertex Pharmaceuticals Incorporated’s internal control over financial reporting as of December 31, 2013, based on criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (1992 framework)(the COSO criteria). Vertex Pharmaceuticals Incorporated’s management is responsible for maintaining effective internal control over financial reporting, and for its assessment of the effectiveness of internal control over financial reporting included in the accompanying Management’s Annual Report on Internal Control Over Financial Reporting. Our responsibility is to express an opinion on the company’s internal control over financial reporting based on our audit.

We conducted our audit in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether effective internal control over financial reporting was maintained in all material respects. Our audit included obtaining an understanding of internal control over financial reporting, assessing the risk that a material weakness exists, testing and evaluating the design and operating effectiveness of internal control based on the assessed risk, and performing such other procedures as we considered necessary in the circumstances. We believe that our audit provides a reasonable basis for our opinion.

A company’s internal control over financial reporting is a process designed to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles. A company’s internal control over financial reporting includes those policies and procedures that (1) pertain to the maintenance of records that, in reasonable detail, accurately and fairly reflect the transactions and dispositions of the assets of the company; (2) provide reasonable assurance that transactions are recorded as necessary to permit preparation of financial statements in accordance with generally accepted accounting principles, and that receipts and expenditures of the company are being made only in accordance with authorizations of management and directors of the company; and (3) provide reasonable assurance regarding prevention or timely detection of unauthorized acquisition, use, or disposition of the company’s assets that could have a material effect on the financial statements.

Because of its inherent limitations, internal control over financial reporting may not prevent or detect misstatements. Also, projections of any evaluation of effectiveness to future periods are subject to the risk that controls may become inadequate because of changes in conditions, or that the degree of compliance with the policies or procedures may deteriorate.

In our opinion, Vertex Pharmaceuticals Incorporated maintained, in all material respects, effective internal control over financial reporting as of December 31, 2013, based on the COSO criteria.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheets of Vertex Pharmaceuticals Incorporated as of December 31, 2013 and 2012, and the related consolidated statements of operations, comprehensive income (loss), shareholders’ equity and noncontrolling interest, and cash flows for each of the three years in the period ended December 31, 2013 of Vertex Pharmaceuticals Incorporated and our report dated February 11, 2014 expressed an unqualified opinion thereon.

/s/ Ernst & Young LLP

Boston, Massachusetts

February 11, 2014

ITEM 9B. OTHER INFORMATION

Not applicable.

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PART III

Portions of our definitive Proxy Statement for the 2014 Annual Meeting of Shareholders, or 2014 Proxy Statement, during which, we expect to, among other things, (i) elect our Class I Directors, (ii) conduct the non-binding advisory vote on our executive compensation program and (iii) ratify the appointment of our independent registered accounting firm, are incorporated by reference into this Part III of our Annual Report on Form 10-K.

ITEM 10. DIRECTORS, EXECUTIVE OFFICERS AND CORPORATE GOVERNANCE

The information regarding directors required by this Item 10 will be included in our 2014 Proxy Statement and is incorporated herein by reference. We expect this information to be provided under “Election of Directors,” “Corporate Governance and Risk Management,” “Shareholder Proposals for the 2014 Annual Meeting and Nominations for Director,” “Section 16(a) Beneficial Ownership Reporting Compliance” and “Code of Conduct.” The information regarding executive officers required by this Item 10 as well as certain information regarding our directors is included in Part I of this Annual Report on Form 10-K.

ITEM 11. EXECUTIVE COMPENSATION

The information required by this Item 11 will be included in the 2014 Proxy Statement and is incorporated herein by reference. We expect this information to be provided under “Compensation Committee Interlocks and Insider Participation,” “Compensation Discussion and Analysis,” “Compensation and Equity Tables,” “Director Compensation,” “Management Development and Compensation Committee Report” and/or “Corporate Governance and Risk Management.”

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT AND RELATED STOCKHOLDER MATTERS

The information required by this Item 12 will be included in the 2014 Proxy Statement and is incorporated herein by reference. We expect this information to be provided under “Security Ownership of Certain Beneficial Owners and Management” and “Equity Compensation Plan Information.”

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR INDEPENDENCE

The information required by this Item 13 will be included in the 2014 Proxy Statement and is incorporated herein by reference. We expect this information to be provided under “ Election of Directors,” “Corporate Governance and Risk Management,” “Approval of Related Person Transactions” and “Transactions with Related Persons.”

ITEM 14. PRINCIPAL ACCOUNTANT FEES AND SERVICES

The information required by this Item 14 will be included in the 2014 Proxy Statement and is incorporated herein by reference. We expect this information to be provided under “Ratification of the Appointment of Independent Registered Public Accounting Firm.”

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PART IV

ITEM 15. EXHIBITS AND FINANCIAL STATEMENT SCHEDULES

(a)(1) The Financial Statements required to be filed by Items 8 and 15(c) of Form 10-K, and filed herewith, are as follows:

	Page Number in this Form 10-K
Report of Independent Registered Public Accounting Firm	F-1
Consolidated Statements of Operations for the years ended December 31, 2013, 2012 and 2011	F-2
Consolidated Statements of Comprehensive Income (Loss) for the years ended December 31, 2013, 2012 and 2011	F-3
Consolidated Balance Sheets as of December 31, 2013 and 2012	F-4
Consolidated Statements of Shareholders’ Equity and Noncontrolling Interest for the years ended December 31, 2013, 2012 and 2011	F-5
Consolidated Statements of Cash Flows for the years ended December 31, 2013, 2012 and 2011	F-6
Notes to Consolidated Financial Statements	F-7

(a)(2) Financial Statement Schedules have been omitted because they are either not applicable or the required information is included in the consolidated financial statements or notes thereto listed in (a)(1) above.

(a)(3) Exhibits.

The following is a list of exhibits filed as part of this Annual Report on Form 10-K.

Exhibit Number	Exhibit Description	Filed with this report	Incorporated by Reference herein from—Form or Schedule	Filing Date/ Period Covered	SEC File/ Reg.  Number
3.1	Restated Articles of Organization of Vertex Pharmaceuticals Incorporated, as amended.		10-Q (Exhibit 3.1)	August 11, 2008	000-19319
3.2	By-laws of Vertex Pharmaceuticals Incorporated, as amended and restated as of February 5, 2014.		8-K (Exhibit 3.1)	February 5, 2014	000-19319
4.1	Specimen stock certificate.		S-1 (Exhibit 4.1)	July 18, 1991	33-40966
Collaboration Agreements
10.1	License, Development, Manufacturing and Commercialization Agreement, dated June 30, 2006, by and between Vertex Pharmaceuticals Incorporated and Janssen Pharmaceutica, N.V.†		10-K (Exhibit 10.1)	February 22, 2012	000-19319
10.2	2013 Amendment, dated November 19, 2013, to the License, Development, Manufacturing and Commercialization Agreement by and between Vertex Pharmaceuticals Incorporated and Janssen Pharmaceutica NV.†	X
10.3	License, Development and Commercialization Agreement, dated as of June 11, 2004, between Vertex Pharmaceuticals Incorporated and Mitsubishi Pharma Corporation.†		10-Q (Exhibit 10.1)	November 9, 2009	000-19319
10.4	Second Amendment to License, Development and Commercialization Agreement, dated July 30, 2009, between Mitsubishi Tanabe Pharma Corporation and Vertex Pharmaceuticals Incorporated.†		10-Q (Exhibit 10.2)	November 9, 2009	000-19319
10.5	Research, Development and Commercialization Agreement, dated as of May 24, 2004, between Vertex Pharmaceuticals Incorporated and Cystic Fibrosis Foundation Therapeutics Incorporated.†		10-Q/A (Exhibit 10.2)	August 19, 2011	000-19319
10.6	Amendment No. 1 to Research, Development and Commercialization Agreement, dated as of January 6, 2006, between Vertex Pharmaceuticals Incorporated and Cystic Fibrosis Foundation Therapeutics Incorporated.†		10-K (Exhibit 10.9)	March 16, 2006	000-19319
10.7	Amendment No. 2 to Research, Development and Commercialization Agreement, dated as of March 17, 2006, between Vertex Pharmaceuticals Incorporated and Cystic Fibrosis Foundation Therapeutics Incorporated.		10-Q/A (Exhibit 10.6)	August 19, 2011	000-19319

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Exhibit Number	Exhibit Description	Filed with this report	Incorporated by Reference herein from—Form or Schedule	Filing Date/ Period Covered	SEC File/ Reg.  Number
10.8	Amendment No. 5 to Research, Development and Commercialization Agreement, effective as of April 1, 2011, between Vertex Pharmaceuticals Incorporated and Cystic Fibrosis Foundation Therapeutics Incorporated.†		10-Q (Exhibit 10.3)	August 9, 2011	000-19319
10.9	License and Collaboration Agreement, dated June 13, 2011, by and between Alios BioPharma, Inc. and Vertex Pharmaceuticals Incorporated and Vertex Pharmaceuticals (Switzerland) LLC.†		10-Q (Exhibit 10.1)	August 9, 2011	000-19319
Leases
10.10	Lease, dated May 5, 2011, between Fifty Northern Avenue LLC and Vertex Pharmaceuticals Incorporated.†		10-Q (Exhibit 10.4)	August 9, 2011	000-19319
10.11	Lease, dated May 5, 2011, between Eleven Fan Pier Boulevard LLC and Vertex Pharmaceuticals Incorporated.†		10-Q (Exhibit 10.5)	August 9, 2011	000-19319
10.12	Lease, dated as of January 18, 2001, between Kendall Square, LLC and Vertex Pharmaceuticals Incorporated.†		10-K (Exhibit 10.16)	March 26, 2001	000-19319
Equity Plans
10.13	1996 Stock and Option Plan, as amended and restated as of March 14, 2005.*		10-K (Exhibit 10.3)	March 16, 2005	000-19319
10.14	Form of Stock Option Grant under 1996 Stock and Option Plan.*		8-K (Exhibit 10.1)	February 9, 2005	000-19319
10.15	Amended and Restated 2006 Stock and Option Plan.*		10-Q (Exhibit 10.3)	August 8, 2012	000-19319
10.16	Form of Stock Option Grant under 2006 Stock and Option Plan.*		8-K (Exhibit 10.2)	May 15, 2006	000-19319
10.17	Form of Restricted Stock Award under 2006 Stock and Option Plan.*		8-K (Exhibit 10.3)	May 15, 2006	000-19319
10.18	Form of Restricted Stock Award (Performance Accelerated Restricted Stock) under 2006 Stock and Option Plan.*		8-K (Exhibit 10.4)	May 15, 2006	000-19319
10.19	Form of Stock Option Grant-Performance Accelerated 2009 Stock-Options.*		10-K (Exhibit 10.33)	February 19, 2010	000-19319
10.20	2013 Stock and Option Plan.*		8-K (Exhibit 10.1)	May 8, 2013	000-19319
10.21	Form of Non-Qualified Stock Option Agreement under 2013 Stock and Option Plan.*	X			000-19319
10.22	Form of Restricted Stock Agreement under 2013 Stock and Option Plan.*	X			000-19319
10.23	Form of Restricted Stock Unit Agreement under 2013 Stock and Option Plan.*	X			000-19319
10.24	Form of Non-Qualified Stock Option Agreement under Amended and Restated 2006 Stock and Option Plan (granted on or after July 30, 2013).*	X			000-19319
10.25	Form of Restricted Stock Agreement under Amended and Restated 2006 Stock and Option Plan (granted on or after July 30, 2013).*	X			000-19319
10.26	Form of Restricted Stock Unit Agreement under Amended and Restated 2006 Stock and Option Plan (granted on or after July 30, 2013).*	X			000-19319
10.27	Vertex Pharmaceuticals Incorporated Employee Stock Purchase Plan, as amended and restated.*		10-Q (Exhibit 10.4)	August 8, 2012	000-19319
Agreements with Executive Officers and Directors
10.28	Agreement between Jeffrey M. Leiden and Vertex, dated December 14, 2011.*		10-K (Exhibit 10.34)	February 22, 2012	000-19319
10.29	Employee Non-disclosure, Non-competition and Inventions Agreement between Jeffrey M. Leiden and Vertex, dated December 14, 2011.*		10-K (Exhibit 10.35)	February 22, 2012	000-19319
10.30	Transition Agreement between Matthew W. Emmens and Vertex, dated December 14, 2011.*		10-K (Exhibit 10.38)	February 22, 2012	000-19319
10.31	Employment Agreement, dated as of August 27, 2012, between Vertex Pharmaceuticals Incorporated and Stuart Arbuckle.*		10-Q (Exhibit 10.1)	November 6, 2012	000-19319
10.32	Change of Control Agreement, dated as of August 27, 2012, between Vertex Pharmaceuticals Incorporated and Stuart Arbuckle.*		10-Q (Exhibit 10.2)	November 6, 2012	000-19319
10.33	Employment Agreement, dated as of June 11, 2012, between Vertex Pharmaceuticals Incorporated and Kenneth L. Horton.*		10-Q (Exhibit 10.1)	August 8, 2012	000-19319

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Exhibit Number	Exhibit Description	Filed with this report	Incorporated by Reference herein from—Form or Schedule	Filing Date/ Period Covered	SEC File/ Reg.  Number
10.34	Change of Control Agreement, dated as of June 11, 2012, between Vertex Pharmaceuticals Incorporated and Kenneth L. Horton.*		10-Q (Exhibit 10.2)	August 8, 2012	000-19319
10.35	Second Amended and Restated Employment Agreement, dated November 15, 2012, between Peter Mueller and Vertex Pharmaceuticals Incorporated.*		10-K (Exhibit 10.38)	March 1, 2013	000-19319
10.36	Second Amended and Restated Change of Control Agreement, dated November 15, 2012, between Vertex Pharmaceuticals Incorporated and Peter Mueller.*		10-K (Exhibit 10.39)	March 1, 2013	000-19319
10.37	Amended and Restated Employment Agreement, dated as of November 8, 2004, between Vertex Pharmaceuticals Incorporated and Ian F. Smith.*		10-Q (Exhibit 10.13)	November 9, 2004	000-19319
10.38	Amendment No. 1 to Amended and Restated Employment Agreement between Ian F. Smith and Vertex Pharmaceuticals Incorporated, dated December 29, 2008.*		10-K (Exhibit 10.66)	February 17, 2009	000-19319
10.39	Form of Employee Non-Disclosure and Inventions Agreement.*		S-1 (Exhibit 10.4)	May 30, 1991	33-40966
10.40	Vertex Employee Compensation Plan.*	X
10.41	Vertex Pharmaceuticals Non-Employee Board Compensation.*		10-K (Exhibit 10.57)	February 22, 2012	000-19319
Subsidiaries
21.1	Subsidiaries of Vertex Pharmaceuticals Incorporated.	X
Consent
23.1	Consent of Independent Registered Public Accounting Firm, Ernst & Young LLP.	X
Certifications
31.1	Certification of the Chief Executive Officer under Section 302 of the Sarbanes-Oxley Act of 2002.	X
31.2	Certification of the Chief Financial Officer under Section 302 of the Sarbanes-Oxley Act of 2002.	X
32.1	Certification of the Chief Executive Officer and the Chief Financial Officer under Section 906 of the Sarbanes-Oxley Act of 2002.	X
101.INS	XBRL Instance	X
101.SCH	XBRL Taxonomy Extension Schema	X
101.CAL	XBRL Taxonomy Extension Calculation	X
101.LAB	XBRL Taxonomy Extension Labels	X
101.PRE	XBRL Taxonomy Extension Presentation	X
101.DEF	XBRL Taxonomy Extension Definition	X

*    Management contract, compensatory plan or agreement.

† Confidential portions of this document have been filed separately with the Securities and Exchange Commission pursuant to a request for confidential treatment.

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SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

	Vertex Pharmaceuticals Incorporated
February 11, 2014	By:	/s/ Jeffrey M. Leiden
		Jeffrey M. Leiden Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

	Name		Title		Date
/s/ Jeffrey M. Leiden		Chair of the Board, President and Chief Executive Officer (Principal Executive Officer)
Jeffrey M. Leiden				February 11, 2014
/s/ Ian F. Smith		Executive Vice President and Chief Financial Officer (Principal Financial Officer)
Ian F. Smith				February 11, 2014
/s/ Paul M. Silva		Senior Vice President and Corporate Controller (Principal Accounting Officer)
Paul M. Silva				February 11, 2014
/s/ David Altshuler		Director
David Altshuler				February 11, 2014
/s/ Joshua S. Boger		Director
Joshua S. Boger				February 11, 2014
/s/ Terrence C. Kearney		Director
Terrence C. Kearney				February 11, 2014
/s/ Yuchun Lee		Director
Yuchun Lee				February 11, 2014
/s/ Margaret G. McGlynn		Director
Margaret G. McGlynn				February 11, 2014
/s/ Wayne J. Riley		Director
Wayne J. Riley				February 11, 2014
/s/ Bruce I. Sachs		Director
Bruce I. Sachs				February 11, 2014
/s/ Elaine S. Ullian		Director
Elaine S. Ullian				February 11, 2014

77

Report of Independent Registered Public Accounting Firm

The Board of Directors and Shareholders of

Vertex Pharmaceuticals Incorporated

We have audited the accompanying consolidated balance sheets of Vertex Pharmaceuticals Incorporated as of December 31, 2013 and 2012, and the related consolidated statements of operations, comprehensive income (loss), shareholders’ equity and noncontrolling interest, and cash flows for each of the three years in the period ended December 31, 2013. These financial statements are the responsibility of the Company’s management. Our responsibility is to express an opinion on these financial statements based on our audits.

We conducted our audits in accordance with the standards of the Public Company Accounting Oversight Board (United States). Those standards require that we plan and perform the audit to obtain reasonable assurance about whether the financial statements are free of material misstatement. An audit includes examining, on a test basis, evidence supporting the amounts and disclosures in the financial statements. An audit also includes assessing the accounting principles used and significant estimates made by management, as well as evaluating the overall financial statement presentation. We believe that our audits provide a reasonable basis for our opinion.

In our opinion, the financial statements referred to above present fairly, in all material respects, the consolidated financial position of Vertex Pharmaceuticals Incorporated at December 31, 2013 and 2012, and the consolidated results of its operations and its cash flows for each of the three years in the period ended December 31, 2013, in conformity with U.S. generally accepted accounting principles.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), Vertex Pharmaceuticals Incorporated’s internal control over financial reporting as of December 31, 2013, based on the criteria established in Internal Control—Integrated Framework issued by the Committee of Sponsoring Organizations of the Treadway Commission (1992 framework) and our report dated February 11, 2014 expressed an unqualified opinion thereon.

/s/ Ernst & Young LLP

Boston, Massachusetts

February 11, 2014

F-1

VERTEX PHARMACEUTICALS INCORPORATED Consolidated Statements of Operations (in thousands, except per share amounts)
	Year Ended December 31,
	2013			2012			2011
Revenues:
Product revenues, net	$	837,645		$	1,333,458		$	950,889
Royalty revenues	156,592			141,498			50,015
Collaborative revenues	217,738			52,086			409,722
Total revenues	1,211,975			1,527,042			1,410,626
Costs and expenses:
Cost of product revenues	88,979			236,742			63,625
Royalty expenses	41,298			43,143			16,880
Research and development expenses	918,783			806,185			707,706
Sales, general and administrative expenses	362,342			436,796			400,721
Restructuring expenses	40,521			1,844			2,074
Intangible asset impairment charges	663,500			—			105,800
Total costs and expenses	2,115,423			1,524,710			1,296,806
Income (loss) from operations	(903,448		)	2,332			113,820
Interest expense, net	(22,730		)	(15,022		)	(37,681		)
Other income (expense), net	(49,939		)	309			(15,694		)
Income (loss) before provision for (benefit from) income taxes	(976,117		)	(12,381		)	60,445
Provision for (benefit from) income taxes	(288,567		)	38,754			19,266
Net income (loss)	(687,550		)	(51,135		)	41,179
Net loss (income) attributable to noncontrolling interest (Alios)	242,522			(55,897		)	(11,605		)
Net income (loss) attributable to Vertex	$	(445,028	)	$	(107,032	)	$	29,574
Net income (loss) per share attributable to Vertex common shareholders:
Basic	$	(1.98	)	$	(0.50	)	$	0.14
Diluted	$	(1.98	)	$	(0.50	)	$	0.14
Shares used in per share calculations:
Basic	224,906			211,946			204,891
Diluted	224,906			211,946			208,807

The accompanying notes are an integral part of the consolidated financial statements.

F-2

VERTEX PHARMACEUTICALS INCORPORATED Consolidated Statements of Comprehensive Income (Loss) (in thousands)
	Year ended December 31,
	2013			2012			2011
Net income (loss)	$	(687,550	)	$	(51,135	)	$	41,179
Changes in other comprehensive income (loss):
Unrealized holding gains (losses) on marketable securities	(154		)	305			(119		)
Unrealized losses on foreign currency forward contracts	(23		)	—			—
Foreign currency translation adjustment	421			198			133
Total changes in other comprehensive income (loss)	244			503			14
Comprehensive income (loss)	(687,306		)	(50,632		)	41,193
Comprehensive loss (income) attributable to noncontrolling interest (Alios)	242,522			(55,897		)	(11,605		)
Comprehensive income (loss) attributable to Vertex	$	(444,784	)	$	(106,529	)	$	29,588

The accompanying notes are an integral part of the consolidated financial statements.

F-3

VERTEX PHARMACEUTICALS INCORPORATED Consolidated Balance Sheets (in thousands, except share and per share amounts)
	December 31,
	2013(1)			2012(1)
Assets
Current assets:
Cash and cash equivalents	$	569,299		$	489,407
Marketable securities, available for sale	895,777			831,808
Restricted cash and cash equivalents (Alios)	—			69,983
Accounts receivable, net	85,517			143,250
Inventories	14,147			30,464
Prepaid expenses and other current assets	23,836			24,673
Total current assets	1,588,576			1,589,585
Restricted cash	130			31,934
Property and equipment, net	696,911			433,609
Intangible assets	—			663,500
Goodwill	30,992			30,992
Other assets	2,432			9,668
Total assets	$	2,319,041		$	2,759,288
Liabilities and Shareholders’ Equity
Current liabilities:
Accounts payable	$	49,327		$	101,292
Accrued expenses	271,077			264,884
Deferred revenues, current portion	21,510			27,566
Accrued restructuring expense, current portion	14,286			4,758
Capital lease obligations, current portion	16,893			13,707
Income taxes payable (Alios)	—			715
Other liabilities, current portion	24,736			19,702
Total current liabilities	397,829			432,624
Deferred revenues, excluding current portion	49,459			96,242
Accrued restructuring expense, excluding current portion	14,067			18,570
Capital lease obligations, excluding current portion	48,754			15,170
Convertible senior subordinated notes (due 2015)	—			400,000
Deferred tax liability	—			280,367
Construction financing lease obligation	440,937			268,031
Other liabilities, excluding current portion	11,590			13,902
Total liabilities	962,636			1,524,906
Commitments and contingencies (Note T and Note V)
Redeemable noncontrolling interest (Alios)	—			38,530
Shareholders’ equity:
Preferred stock, $0.01 par value; 1,000,000 shares authorized; none issued and outstanding at December 31, 2013 and 2012	—			—
Common stock, $0.01 par value; 300,000,000 shares authorized at December 31, 2013 and 2012; 233,788,852 and 217,286,868 shares issued and outstanding at December 31, 2013 and 2012, respectively	2,320			2,149
Additional paid-in capital	5,321,286			4,519,448
Accumulated other comprehensive loss	(306		)	(550		)
Accumulated deficit	(3,966,895		)	(3,521,867		)
Total Vertex shareholders’ equity	1,356,405			999,180
Noncontrolling interest (Alios)	—			196,672
Total shareholders’ equity	1,356,405			1,195,852
Total liabilities and shareholders’ equity	$	2,319,041		$	2,759,288

(1) Amounts as of December 31, 2012 include the assets and liabilities of Vertex’s variable interest entity (“VIE”), Alios BioPharma, Inc. (“Alios”). The Company deconsolidated Alios as of December 31, 2013. Vertex’s interests and obligations with respect to the VIE’s assets and liabilities are limited to those accorded to Vertex in its agreement with Alios. See Note B, "Collaborative Arrangements," to these consolidated financial statements for amounts.

The accompanying notes are an integral part of the consolidated financial statements.

F-4

VERTEX PHARMACEUTICALS INCORPORATED Consolidated Statements of Shareholders’ Equity and Noncontrolling Interest (in thousands)
	Common Stock			Additional Paid-in Capital			Accumulated Other Comprehensive Loss			Accumulated Deficit			Total Vertex Shareholders’ Equity			Noncontrolling Interest (Alios)			Total Shareholders’ Equity			Redeemable Noncontrolling Interest (Alios)
	Shares	Amount
Balance, December 31, 2010	203,523	$	2,016	$	3,947,433		$	(1,067	)	$	(3,444,409	)	$	503,973		$	—		$	503,973		$	—
Unrealized holding losses on marketable securities							(119		)				(119		)				(119		)
Foreign currency translation adjustment							133						133						133
Net income										29,574			29,574			11,605			41,179
Issuance of common stock under benefit plans	5,781	56		133,362									133,418			(25		)	133,393
Stock-based compensation expense				118,964									118,964			304			119,268
Tax benefit from equity compensation				900									900						900
Alios noncontrolling interest upon consolidation																130,486			130,486			36,299
Change in liquidation value of noncontrolling interest																(737		)	(737		)	737
Balance, December 31, 2011	209,304	$	2,072	$	4,200,659		$	(1,053	)	$	(3,414,835	)	$	786,843		$	141,633		$	928,476		$	37,036
Unrealized holding gains on marketable securities							305						305						305
Foreign currency translation adjustment							198						198						198
Net income (loss)										(107,032		)	(107,032		)	55,897			(51,135		)
Issuance of common stock under benefit plans	7,983	77		201,760									201,837			155			201,992
Stock-based compensation expense				115,058									115,058			481			115,539
Tax benefit from equity compensation				1,971									1,971						1,971
Change in liquidation value of noncontrolling interest																(1,494		)	(1,494		)	1,494
Balance, December 31, 2012	217,287	$	2,149	$	4,519,448		$	(550	)	$	(3,521,867	)	$	999,180		$	196,672		$	1,195,852		$	38,530
Unrealized holding losses on marketable securities							(154		)				(154		)				(154		)
Unrealized losses on foreign currency forward contracts							(23		)				(23		)				(23		)
Foreign currency translation adjustment							421						421						421
Net loss										(445,028		)	(445,028		)	(242,522		)	(687,550		)
Issuance of common stock under benefit plans	8,226	88		271,713									271,801			(63		)	271,738
Convertible senior subordinated notes (due 2015) conversion	8,276	83		402,182									402,265						402,265
Stock-based compensation expense				127,883									127,883			468			128,351
Restructuring expense related to benefit plans				1,312									1,312						1,312
Tax benefit from equity compensation				(1,252		)							(1,252		)				(1,252		)
Alios noncontrolling interest upon deconsolidation													—			45,445			45,445			(38,530		)
Balance, December 31, 2013	233,789	$	2,320	$	5,321,286		$	(306	)	$	(3,966,895	)	$	1,356,405		$	—		$	1,356,405		$	—

The accompanying notes are an integral part of the consolidated financial statements.

F-5

VERTEX PHARMACEUTICALS INCORPORATED Consolidated Statements of Cash Flows (in thousands)
	Year Ended December 31,
	2013			2012			2011
Cash flows from operating activities:
Net income (loss)	$	(687,550	)	$	(51,135	)	$	41,179
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization expense	48,365			38,191			35,041
Stock-based compensation expense	127,303			114,285			118,226
Other non-cash based compensation expense	5,860			10,261			8,525
Intangible asset impairment charges	663,500			—			105,800
Secured notes (due 2012) discount amortization expense	—			—			18,409
Change in fair value of derivative instruments	—			—			16,801
Deferred income taxes	(285,053		)	36,660			(7,501		)
Non-cash restructuring charges	7,594			—			—
Deconsolidation of variable interest entity (Alios)	55,110			—			—
Write-downs of inventories to net realizable value	10,358			133,189			—
Excess tax benefit from share-based payment arrangements	1,252			(1,971		)	(900		)
Other non-cash items, net	6,742			178			319
Changes in operating assets and liabilities, excluding the effects of the acquisition and deconsolidation of a variable interest entity (Alios):
Accounts receivable, net	53,363			39,912			(170,606		)
Inventories	7,142			(29,925		)	(111,388		)
Prepaid expenses and other current assets	(12,061		)	(23,619		)	10,358
Accounts payable	(49,234		)	14,892			37,468
Accrued expenses and other liabilities	43,725			29,232			116,822
Accrued restructuring expense	5,025			(2,985		)	(3,282		)
Deferred revenues	(53,011		)	(39,324		)	(71,536		)
Net cash provided by (used in) operating activities	(51,570		)	267,841			143,735
Cash flows from investing activities:
Purchases of marketable securities	(2,412,418		)	(1,705,829		)	(721,545		)
Sales and maturities of marketable securities	2,348,295			1,367,927			1,016,040
Payment for acquisition of variable interest entity (Alios)	—			—			(60,000		)
Expenditures for property and equipment	(51,393		)	(71,140		)	(34,595		)
Decrease in restricted cash and cash equivalents	31,804			2,156			—
Decrease (increase) in restricted cash and cash equivalents (Alios)	27,884			(18,105		)	12,695
Decrease (increase) in other assets	1,698			(826		)	(183		)
Net cash provided by (used in) investing activities	(54,130		)	(425,817		)	212,412
Cash flows from financing activities:
Excess tax benefit from share-based payment arrangements	(1,252		)	1,971			900
Issuances of common stock under benefit plans	265,878			191,721			124,862
Payments to redeem secured notes	(158		)	—			(155,000		)
Settlement of milestone derivatives	—			—			(95,000		)
Payments on capital lease obligations	(16,057		)	(2,615		)	—
Payments on construction financing lease obligation	(67,527		)	(18,873		)	—
Net cash provided by (used in) financing activities	180,884			172,204			(124,238		)
Effect of changes in exchange rates on cash	4,708			(141		)	214
Net increase in cash and cash equivalents	79,892			14,087			232,123
Cash and cash equivalents—beginning of period	489,407			475,320			243,197
Cash and cash equivalents—end of period	$	569,299		$	489,407		$	475,320
Supplemental disclosure of cash flow information:
Cash paid for interest	$	11,015		$	13,400		$	13,512
Cash paid for income taxes	$	2,840		$	9,318		$	—
Conversion of convertible senior subordinated notes (due 2015) for common stock	$	399,842		$	—		$	—
Capitalization of construction in-process related to construction financing lease obligation	$	215,013		$	235,594		$	54,655
Assets acquired under capital lease obligations	$	50,972		$	30,101		$	—
Unamortized deferred debt issuance costs exchanged	$	4,230		$	—		$	—

The accompanying notes are an integral part of the consolidated financial statements.

F-6

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements

A. Nature of Business and Accounting Policies

Business

Vertex Pharmaceuticals Incorporated (“Vertex” or the “Company”) is in the business of discovering, developing, manufacturing and commercializing small molecule drugs for patients with serious diseases in specialty markets. The Company's two products are: KALYDECO (ivacaftor), which the Company markets in the United States and international markets for the treatment of patients six years of age and older with cystic fibrosis (“CF”), who have the G551D mutation in their cystic fibrosis transmembrane conductance regulator (“CFTR”) gene, and INCIVEK (telaprevir), which is approved in the United States and Canada for the treatment of adults with genotype 1 hepatitis C virus (“HCV”) infection.

The Company began recognizing net product revenues from sales of INCIVEK and KALYDECO in the second quarter of 2011 and first quarter of 2012, respectively. The Company’s collaborator, Janssen Pharmaceutica NV (“Janssen”), began marketing telaprevir in its territories under the brand name INCIVO in September 2011. The Company’s net loss attributable to Vertex for 2013 was $445.0 million, or $1.98 per share. As of December 31, 2013, the Company had cash, cash equivalents and marketable securities of approximately $1.47 billion. The Company expects that cash flows from the sales of its products, together with the Company’s cash, cash equivalents and marketable securities, will be sufficient to fund its operations for at least the next twelve months.

Vertex is subject to risks common to companies in its industry including, but not limited to, the dependence on revenues from KALYDECO, competition, uncertainty about clinical trial outcomes and regulatory approvals, uncertainties relating to pharmaceutical pricing and reimbursement, rapid technological change, uncertain protection of proprietary technology, the need to comply with government regulations, share price volatility, dependence on collaborative relationships and potential product liability.

Basis of Presentation

The consolidated financial statements reflect the operations of (i) the Company and (ii) its wholly-owned subsidiaries. In addition, the consolidated financial statements for the period from June 13, 2011 through December 31, 2013, reflect the operations of Alios BioPharma, Inc. (“Alios”), a collaborator that is a variable interest entity (a “VIE”) for which the Company was deemed under applicable accounting guidance to have a variable interest and be the primary beneficiary. As of December 31, 2013, the Company deconsolidated Alios, and the Company's consolidated balance sheet as of December 31, 2013 excludes Alios. All material intercompany balances and transactions have been eliminated. The Company operates in one segment, pharmaceuticals. Please refer to Note X, "Segment Information," for enterprise-wide disclosures regarding the Company’s revenues, major customers and long-lived assets by geographic area.

Use of Estimates

The preparation of consolidated financial statements in accordance with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and the amounts of revenues and expenses during the reported periods. Significant estimates in these consolidated financial statements have been made in connection with the calculation of revenues, inventories, research and development expenses, stock-based compensation expense, restructuring expense, the fair value of intangible assets, noncontrolling interest (Alios), the consolidation and deconsolidation of a VIE, leases and the income tax provision. The Company bases its estimates on historical experience and various other assumptions, including in certain circumstances future projections, that management believes to be reasonable under the circumstances. Actual results could differ from those estimates. Changes in estimates are reflected in reported results in the period in which they become known.

F-7

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

Revenue Recognition

Product Revenues, Net

The Company sells its products principally to a limited number of major and selected regional wholesalers and specialty pharmacy providers in North America as well as government-owned and supported customers in Europe (collectively, its “Customers”). The Company's Customers in North America subsequently resell the products to patients and health care providers. The Company recognizes net revenues from product sales upon delivery as long as (i) there is persuasive evidence that an arrangement exists between the Company and the Customer, (ii) collectibility is reasonably assured and (iii) the price is fixed or determinable.

In order to conclude that the price is fixed or determinable, the Company must be able to (i) calculate its gross product revenues from sales to Customers and (ii) reasonably estimate its net product revenues upon delivery to its Customer's locations. The Company calculates gross product revenues based on the price that the Company charges its Customers. The Company estimates its net product revenues by deducting from its gross product revenues (a) trade allowances, such as invoice discounts for prompt payment and Customer fees, (b) estimated government and private payor rebates, chargebacks and discounts, (c) estimated reserves for expected product returns and (d) estimated costs of incentives offered to certain indirect customers, including patients.

The Company makes significant estimates and judgments that materially affect the Company’s recognition of net product revenues. In certain instances, the Company may be unable to reasonably conclude that the price is fixed or determinable at the time of delivery, in which case it defers the recognition of revenues. Once the Company is able to determine that the price is fixed or determinable, it recognizes the revenues associated with the units in which revenue recognition was deferred.

Trade Allowances: The Company generally provides invoice discounts on product sales to its Customers for prompt payment and pays fees for distribution services, such as fees for certain data that Customers provide to the Company. The payment terms for sales to Customers in the United States generally include a 2% discount for payment within 30 days. The Company expects that, based on its experience, its Customers will earn these discounts and fees, and deducts the full amount of these discounts and fees from its gross product revenues and accounts receivable at the time such revenues are recognized.

Rebates, Chargebacks and Discounts: The Company contracts with government agencies and various private organizations (collectively, its “Third-party Payors”) so that products will be eligible for purchase by, or partial or full reimbursement from, such Third-party Payors. The Company estimates the rebates, chargebacks and discounts it will provide to Third-party Payors and deducts these estimated amounts from its gross product revenues at the time the revenues are recognized. For each product, the Company estimates the aggregate rebates, chargebacks and discounts that it will provide to Third-party Payors based upon (i) the Company’s contracts with these Third-party Payors, (ii) the government-mandated discounts applicable to government-funded programs, (iii) information obtained from the Company’s Customers regarding the payor mix for such product and (iv) historical experience.

Product Returns: The Company estimates the amount of each product that will be returned and deducts these estimated amounts from its gross revenues at the time the revenues are recognized. The Company’s Customers have the right to return unopened unprescribed packages, subject to contractual limitations. To date product returns have been minimal and, based on inventory levels held by its Customers and its distribution model, the Company believes that returns of its products will continue to be minimal.

Other Incentives: Other incentives that the Company offers include co-pay mitigation rebates provided by the Company to commercially insured patients who have coverage and who reside in states that permit co-pay mitigation programs. The Company’s co-pay mitigation programs are intended to reduce each participating patient’s portion of the financial responsibility for a product’s purchase price to a specified dollar amount. Based upon the terms of the Company's co-pay mitigation programs, the Company estimates average co-pay mitigation amounts for each of its products in order to establish its accruals for co-pay mitigation rebates and deducts these estimated amounts from its gross product revenues at the later of the date (i) the revenues are recognized or (ii) the incentive is offered. The Company’s co-pay mitigation rebates are subject to expiration.

F-8

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

The following table summarizes activity in each of the product revenue allowance and reserve categories for the three years ended December 31, 2013:

	Trade Allowances			Rebates, Chargebacks and Discounts			Product Returns			Other Incentives			Total
	(in thousands)
2013
Beginning Balance	$	5,416		$	63,560		$	2,852		$	3,565		$	75,393
Provision related to current period sales	31,395			204,459			5,795			9,295			250,944
Adjustments related to prior period sales	343			4,474			15,149			(228		)	19,738
Credits/payments made	(35,619		)	(204,249		)	(7,997		)	(11,077		)	(258,942		)
Ending Balance	$	1,535		$	68,244		$	15,799		$	1,555		$	87,133
2012
Beginning Balance	$	11,162		$	52,659		$	340		$	5,202		$	69,363
Provision related to current period sales	55,913			216,942			2,067			19,103			294,025
Adjustments related to prior period sales	29			3,883			1,498			72			5,482
Credits/payments made	(61,688		)	(209,924		)	(1,053		)	(20,812		)	(293,477		)
Ending Balance	$	5,416		$	63,560		$	2,852		$	3,565		$	75,393
2011
Beginning Balance	$	—		$	—		$	—		$	—		$	—
Provision related to current period sales	38,228			75,145			553			9,692			123,618
Credits/payments made	(27,066		)	(22,486		)	(213		)	(4,490		)	(54,255		)
Ending Balance	$	11,162		$	52,659		$	340		$	5,202		$	69,363

Based on the current information available to the Company, cumulative adjustments related to prior period sales represent 0.7% and 1.3%, respectively, of the gross product revenues that were recorded in the years ended December 31, 2012 and 2011.

Royalty Revenues

The Company’s royalty revenues on commercial sales of INCIVO (telaprevir) by Janssen are based on net sales of licensed products in licensed territories as provided by Janssen. The Company recognizes royalty revenues in the period the sales occur.

The Company has sold its rights to receive certain royalties on sales of an HIV protease inhibitor (fosamprenavir) and recognizes the revenues related to this sale as royalty revenues. In the circumstance where the Company has sold its rights to future royalties under a license agreement and also maintains continuing involvement in the royalty arrangement (but not significant continuing involvement in the generation of the cash flows payable to the purchaser of the future royalty rights), the Company defers recognition of the proceeds it receives for the royalty stream and recognizes these deferred revenues over the life of the license agreement pursuant to the units-of-revenue method. The Company’s estimates regarding the estimated remaining royalty payments due to the purchaser have changed in the past and may change in the future.

Collaborative Revenues

The Company recognizes revenues generated through collaborative research, development and/or commercialization agreements. The terms of these agreements typically include payment to the Company of one or more of the following: nonrefundable, up-front license fees; development and commercial milestone payments; funding of research and/or development activities; payments for services the Company provides through its third-party manufacturing network; and royalties on net sales of licensed products. Each of these types of payments results in collaborative revenues, except for revenues from royalties on net sales of licensed products, which are classified as royalty revenues.

F-9

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

For each collaborative research, development and/or commercialization agreement that result in revenues, the Company determines (i) whether multiple deliverables exist, (ii) whether the undelivered elements have value to the customer on a stand-alone basis, (iii) how the deliverables should be separated and (iv) how the consideration should be allocated to the deliverables. For arrangements entered into or materially modified after January 1, 2011, the Company allocates consideration in an arrangement using the relative selling price method based on management’s best estimate of selling price of deliverables if it does not have vendor-specific objective evidence or third-party evidence. As part of the accounting for these agreements, the Company must develop assumptions that require judgment to determine the best estimate of selling price. Key assumptions utilized by the Company to determine the best estimate of selling price may include patient enrollment requirements from regulatory authorities, development timelines, reimbursement rates for personnel costs, discount rates, and estimated third-party development costs.

The Company evaluates amendments to its existing arrangements to determine whether they have been materially modified. In making its determination that an arrangement has been materially modified, the Company considers whether there have been significant changes to the consideration under the arrangement, the deliverables under the arrangement, the timing of deliverables and the period of the arrangement. If the arrangement is determined to have been materially modified, the Company allocates fixed consideration under the arrangement using its best estimate of selling price to the remaining undelivered elements at the date of material modification. Any consideration remaining after the allocation is recognized as revenue.

Collaborative research, development and/or commercialization agreements entered into prior to January 1, 2011 that contained multiple elements of revenue were divided into separate units of accounting if certain criteria were met, including whether the delivered element had stand-alone value to the collaborator and whether there was objective and reliable evidence of the fair value of the undelivered obligation(s). The Company allocated consideration it received among the separate units either on the basis of each unit’s fair value or using the residual method, and applied the revenue recognition criteria to each of the separate units.

Up-front License Fees: If the license to the Company's intellectual property was determined to have stand-alone value from the other deliverables identified in the arrangement, the Company recognized revenues from nonrefundable, up-front license fees upon delivery. If these licenses did not have stand-alone value, the Company recognized revenues from nonrefundable, up-front license fees on a straight-line basis over the contracted or estimated period of performance. The Company evaluated the period of performance each reporting period and adjusted the period of performance on a prospective basis if there were changes to be made.

Milestone Payments: At the inception of each agreement that included research and development milestone payments, the Company evaluated whether each milestone was substantive. The Company recognized revenues related to substantive milestones in full in the period in which the substantive milestone was achieved if payment was reasonably assured. If a milestone was not considered substantive, the Company recognized the applicable milestone payment over the period of performance.

Research and Development Activities/Manufacturing Services: If the Company was entitled to reimbursement from its collaborators for specified research and development expenses and/or was entitled to payments for specified manufacturing services that the Company provided through its third-party manufacturing network, the Company determined whether the research and development funding would result in collaborative revenues or an offset to research and development expenses.

Concentration of Credit Risk

Financial instruments that potentially subject the Company to concentration of credit risk consist principally of money market funds and marketable securities. The Company places these investments with highly rated financial institutions, and, by policy, limits the amounts of credit exposure to any one financial institution. These amounts at times may exceed federally insured limits. The Company has not experienced any credit losses in these accounts and does not believe it is exposed to any significant credit risk on these funds. The Company implemented a foreign exchange hedging program in December 2013. As of December 31, 2013, the notional amount and fair value of these hedges was not significant.

F-10

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

The Company also is subject to credit risk from its accounts receivable related to its product sales and collaborators. The Company evaluates the creditworthiness of each of its customers and has determined that all of its material customers are creditworthy. To date, the Company has not experienced significant losses with respect to the collection of its accounts receivable. The Company's receivables from Greece and Italy were not material in 2013, and the Company had no receivables from Spain or Portugal in 2013. The Company believes that its allowance for doubtful accounts was adequate at December 31, 2013. Please refer to Note X, "Segment Information," for further information.

Cash and Cash Equivalents

The Company considers all highly liquid investments with original maturities of three months or less at the date of purchase to be cash equivalents.

Restricted Cash

Restricted cash consists of balances held in deposit with certain banks to collateralize conditional stand-by letters of credit in the names of the Company’s landlords pursuant to certain operating lease agreements. The Company also separately disclosed on its consolidated balance sheet restricted cash and cash equivalents (Alios) as of December 31, 2012. The Company deconsolidated Alios as of December 31, 2013. Please refer to Note B, "Collaborative Arrangements," for further information.

Marketable Securities

The Company's marketable securities consist of investments in government-sponsored enterprise securities, corporate debt securities and commercial paper that are classified as available-for-sale. The Company classifies marketable securities available to fund current operations as current assets on its consolidated balance sheets. Marketable securities are classified as long-term assets on the consolidated balance sheets if (i) they have been in an unrealized loss position for longer than one year and (ii) the Company has the ability and intent to hold them (a) until the carrying value is recovered and (b) such holding period may be longer than one year. The Company's marketable securities are stated at fair value with their unrealized gains and losses included as a component of accumulated other comprehensive loss, which is a separate component of shareholders’ equity, until such gains and losses are realized. The fair value of these securities is based on quoted prices for identical or similar assets.

The Company reviews investments in marketable securities for other-than-temporary impairment whenever the fair value of an investment is less than the amortized cost and evidence indicates that an investment’s carrying amount is not recoverable within a reasonable period of time. To determine whether an impairment is other-than-temporary, the Company considers whether it has an intent to sell, or whether it is more likely than not that the Company will be required to sell, the investment before recovery of the investment’s amortized cost basis. Evidence considered in this assessment includes reasons for the impairment, compliance with the Company’s investment policy, the severity and the duration of the impairment and changes in value subsequent to year-end. If a decline in the fair value is considered other-than-temporary, based on available evidence, the unrealized loss is transferred from other comprehensive income (loss) to the consolidated statements of operations.

There were no charges recorded for other-than-temporary declines in fair value of marketable securities in 2013, 2012 or 2011. Realized gains and losses are determined using the specific identification method and are included in other income (expense), net in the consolidated statements of operations. There were no gross realized gains or losses recognized in 2013, 2012 or 2011.

Stock-based Compensation Expense

The Company expenses the fair value of employee stock options and other forms of stock-based employee compensation over the associated employee service period on a straight-line basis. For awards with performance conditions, the Company estimates the likelihood of satisfaction of the performance conditions, which affects the period over which the expense is recognized, and recognizes the expense using the accelerated attribution model. Stock-based compensation expense is determined based on the fair value of the award at the grant date, including estimated forfeitures, and is adjusted each period to reflect actual forfeitures and the outcomes of certain performance conditions.

F-11

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

Research and Development Expenses

The Company expenses as incurred all research and development expenses, including amounts funded by research and development collaborations. The Company capitalizes nonrefundable advance payments made by the Company for research and development activities and expenses the payments as the related goods are delivered or the related services are performed.

Research and development expenses are comprised of costs incurred by the Company in performing research and development activities, including salary and benefits; stock-based compensation expense; laboratory supplies and other direct expenses; contractual services costs, including clinical trial and pharmaceutical development costs; expenses associated with drug supplies that are not being capitalized; and infrastructure costs, including facilities costs and depreciation expense.

Advertising Expenses

The Company expenses the costs of advertising, including promotional expenses, as incurred. Advertising expenses, recorded in sales, general and administrative expenses, were $19.6 million, $58.6 million and $30.8 million in 2013, 2012 and 2011, respectively.

Inventories

The Company values its inventories at the lower-of-cost or market. The Company determines the cost of its inventories, which includes amounts related to materials and manufacturing overhead, on a first-in, first-out basis. The Company performs an assessment of the recoverability of capitalized inventory during each reporting period, and writes down any excess and obsolete inventories to their realizable value in the period in which the impairment is first identified. Shipping and handling costs incurred for inventory purchases are capitalized and recorded upon sale in cost of product revenues in the consolidated statements of operations. Shipping and handling costs incurred for product shipments are recorded as incurred in cost of product revenues in the consolidated statements of operations.

The Company capitalizes inventories produced in preparation for initiating sales of a drug candidate when the related drug candidate is considered to have a high likelihood of regulatory approval and the related costs are expected to be recoverable through sales of the inventories. In determining whether or not to capitalize such inventories, the Company evaluates, among other factors, information regarding the drug candidate’s safety and efficacy, the status of regulatory submissions and communications with regulatory authorities and the outlook for commercial sales, including the existence of current or anticipated competitive drugs and the availability of reimbursement. In addition, the Company evaluates risks associated with manufacturing the drug candidate and the remaining shelf-life of the inventories.

Property and Equipment

Property and equipment are recorded at cost. Depreciation expense is recorded using the straight-line method over the estimated useful life of the related asset, generally seven to ten years for furniture and equipment, three to five years for computers and software, 40 years for buildings and for leasehold improvements, the useful life of the improvements or the estimated remaining life of the associated lease. Maintenance and repairs to an asset that do not improve or extend its life are charged to operations. When assets are retired or otherwise disposed of, the assets and related accumulated depreciation are eliminated from the accounts and any resulting gain or loss is reflected in the Company’s consolidated statements of operations. The Company performs an assessment of the fair value of the assets if indicators of impairment are identified during a reporting period and records the assets at the lower of the net book value or the fair value of the assets.

The Company capitalizes internal costs incurred to develop software for internal use during the application development stage. The Company expenses costs related to the planning and post-implementation phases of development of software for internal use as these costs are incurred. Maintenance and enhancement costs (including costs in the post-implementation stages) are expensed as incurred, unless such costs relate to substantial upgrades and enhancements to the software resulting in added functionality, in which case the costs are capitalized. Amortization of capitalized internally developed software costs is recorded in depreciation expense over the useful life of the related asset.

F-12

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

The Company records certain construction costs incurred by a landlord as an asset and corresponding financing obligation on the Company's consolidated balance sheets as the owner of the buildings for accounting purposes.

Capital Leases

The assets and liabilities associated with capital lease agreements are recorded at the present value of the minimum lease payments at the inception of the lease agreement. The assets are amortized using the straight-line method over the estimated useful life of the related asset or the remaining life of the associated lease. Amortization of assets that the Company leases pursuant to a capital lease is included in depreciation expense. The Company performs an assessment of the fair value of the assets if indicators of impairment are identified during a reporting period and records the assets at the lower of the net book value or the fair value of the assets. Assets recorded under capital leases are recorded within "Property and equipment, net" and liabilities related to those assets are recorded within "Capital lease obligations, current portion" and "Capital lease obligations, excluding current portion," on the Company's consolidated balance sheets.

Income Taxes    

Deferred tax assets and liabilities are recognized for the expected future tax consequences of temporary differences between the financial statement carrying amounts and the income tax bases of assets and liabilities. A valuation allowance is applied against any net deferred tax asset if, based on the available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized.

The Company records liabilities related to uncertain tax positions by prescribing a minimum recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. The Company does not believe any such uncertain tax positions currently pending will have a material adverse effect on its consolidated financial statements.

Variable Interest Entities

The Company reviews each collaboration agreement pursuant to which the Company licenses assets owned by a collaborator in order to determine whether or not the collaborator is a VIE. If the collaborator is a VIE, the Company assesses whether or not the Company is the primary beneficiary of that VIE based on a number of factors, including (i) which party has the power to direct the activities that most significantly affect the VIE’s economic performance, (ii) the parties’ contractual rights and responsibilities pursuant to the collaboration agreement and (iii) which party has the obligation to absorb losses or the right to receive benefits from the VIE. If the Company determines it is the primary beneficiary of a VIE at the onset of the collaboration agreement, the collaboration is treated as a business combination and the Company consolidates the financial statements of the VIE into the Company’s consolidated financial statements. The Company evaluates whether it continues to be the primary beneficiary of any consolidated VIEs on a quarterly basis. If the Company determines that it is no longer the primary beneficiary of a consolidated VIE, or no longer has a variable interest in the VIE, it deconsolidates the VIE in the period that the determination is made.

Business Combinations

The Company assigns the value of consideration, including contingent consideration, transferred in business combinations to the appropriate accounts on the Company's consolidated balance sheet based on their fair value as of the effective date of the transaction. If a collaboration has been treated as a business combination and there are contingent payments, increases in the fair value of the contingent payments pursuant to collaborations accounted for as business combinations result in a decrease in net income attributable to Vertex (or an increase in net loss attributable to Vertex) on a dollar-for-dollar basis. Transaction costs and any restructuring costs associated with these transactions are expensed as incurred.

Fair Value of In-process Research and Development Assets and Contingent Payments in Business Combinations

The present-value models used to estimate the fair values of research and development assets and contingent payments pursuant to collaborations incorporate significant assumptions, including: assumptions regarding the probability of obtaining marketing approval and/or achieving relevant development milestones for a drug candidate; estimates regarding the timing of

F-13

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

and the expected costs to develop a drug candidate; estimates of future cash flows from potential product sales and/or the potential to achieve certain commercial milestones with respect to a drug candidate; and the appropriate discount and tax rates.

In-process Research and Development Assets

The Company records the fair value of in-process research and development assets as of the transaction date of a business combination. Each of these assets is accounted for as an indefinite-lived intangible asset and is maintained on the Company’s consolidated balance sheet until either the project underlying it is completed or the asset becomes impaired. If the asset becomes impaired or is abandoned, the carrying value of the related intangible asset is written down to its fair value, and an impairment charge is recorded in the period in which the impairment occurs. If a project is completed, the carrying value of the related intangible asset is amortized as a part of cost of product revenues over the remaining estimated life of the asset beginning in the period in which the project is completed. In-process research and development assets are tested for impairment on an annual basis as of October 1, and more frequently if indicators are present or changes in circumstances suggest that impairment may exist.

Goodwill

The difference between the purchase price and the fair value of assets acquired and liabilities assumed in a business combination is allocated to goodwill. Goodwill is evaluated for impairment on an annual basis as of October 1, and more frequently if indicators are present or changes in circumstances suggest that impairment may exist.

Deconsolidation and Discontinued Operations

Upon the occurrence of certain events and on a regular basis, the Company evaluates whether it no longer has a controlling financial interest in its subsidiaries, including deemed subsidiaries such as consolidated VIEs. If it is determined that the Company no longer has a controlling interest, the subsidiary is deconsolidated. The Company records a gain or loss on deconsolidation based on the difference on the deconsolidation date between (i) the aggregate of (a) the fair value of any consideration received, (b) the fair value of any retained noncontrolling investment in the former subsidiary and (c) the carrying amount of any noncontrolling interest in the subsidiary being deconsolidated, less (ii) the carrying amount of the former subsidiary’s assets and liabilities.

The Company assesses whether a deconsolidation is required to be presented as discontinued operations in its consolidated financial statements on the deconsolidation date. This assessment is based on whether or not (i) the operations and cash flows to the former subsidiary have been or will be eliminated from the Company's ongoing operations as a result of the deconsolidation event and (ii) the Company will have any significant continuing involvement in the operations of the former subsidiary after the deconsolidation event. If the Company determines that a deconsolidation requires presentation as a discontinued operation on the deconsolidation date, or at any point during the one year period following such date, it will present the former subsidiary as a discontinued operation in current and comparative period financial statements.

Derivative Instruments, Embedded Derivatives and Hedging Activities

The Company has entered into financial transactions involving free-standing derivative instruments and embedded derivatives in the past. Embedded derivatives are required to be bifurcated from the host instruments because the derivatives are not clearly and closely related to the host instruments. The Company determines the fair value of each derivative instrument or embedded derivative that is identified on the date of issuance and at the end of each quarterly period. The estimates of the fair value of these derivatives, particularly with respect to derivatives related to the achievement of milestones in the development of telaprevir, included significant assumptions regarding the estimates market participants would make in order to evaluate these derivatives.

The Company recognizes the fair value of hedging instruments that are designated and qualify as hedging instruments pursuant to GAAP, primarily foreign currency forward contracts, as either assets or liabilities on the consolidated balance sheets. Changes in the fair value of hedging instruments are recorded each period in accumulated other comprehensive loss until the date of settlement, at which point the cumulative change in the fair value since the inception of the hedge is

F-14

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

recognized in "Product revenues, net," in its consolidated statements of operations. The Company classifies the cash flows from hedging instruments in the same category as the cash flows from the hedged items.

The Company assesses, both at inception and on an ongoing basis, whether the foreign currency forward contracts used in hedging transactions are highly effective in offsetting the changes in cash flows of the hedged items. The Company also assesses hedge ineffectiveness quarterly and, if determined to be ineffective, records the gain or loss related to the ineffective portion to earnings in "Other income (expense), net" in the consolidated statements of operations.

Restructuring Expenses

The Company records costs and liabilities associated with exit and disposal activities based on estimates of fair value in the period the liabilities are incurred. In periods subsequent to the initial measurement, the Company measures changes to the liability using the credit-adjusted risk-free discount rate applied in the initial period. The Company evaluates and adjusts these liabilities as appropriate for changes in circumstances at least on a quarterly basis.

Comprehensive Income (Loss)

Comprehensive income (loss) consists of net income (loss) and other comprehensive income (loss), which includes foreign currency translation adjustments and unrealized gains and losses on foreign currency forward contracts and certain marketable securities. For purposes of comprehensive income (loss) disclosures, the Company does not record tax provisions or benefits, as the Company intends to permanently reinvest undistributed earnings in its foreign subsidiaries.

Foreign Currency Translation and Transactions

All material consolidated entities have the U.S. dollar as their functional currency. Non-U.S. dollar functional currency subsidiaries have assets and liabilities translated into U.S. dollars at rates of exchange in effect at the end of the year. Revenue and expense amounts are translated using the average exchange rates for the period. Net unrealized gains and losses resulting from foreign currency translation are included in accumulated other comprehensive loss, which is a separate component of shareholders’ equity. Included in accumulated other comprehensive loss are net unrealized losses related to foreign currency translation of $0.3 million, $0.7 million and $0.9 million at December 31, 2013, 2012, and 2011, respectively. Net foreign currency exchange transaction gains or losses are included in "Net income (loss)" on the Company’s consolidated statement of operations. Net transaction gains were $5.1 million and $0.7 million for 2013 and 2011, respectively, and net transaction losses were $0.4 million in 2012.

Net Income (Loss) Per Share Attributable to Vertex Common Shareholders

Basic and diluted net income per share attributable to Vertex common shareholders are presented in conformity with the two-class method required for participating securities. Under the two-class method, earnings are allocated to (i) Vertex common shares, excluding unvested restricted stock, and (ii) participating securities, based on their respective weighted-average shares outstanding for the period. Shares of unvested restricted stock granted under the Company's Amended and Restated 2006 Stock and Option Plan have the non-forfeitable right to receive dividends on an equal basis with other outstanding common stock. As a result, these unvested shares of restricted stock are considered participating securities under the two-class method. Potentially dilutive shares result from the assumed exercise of outstanding stock options (the proceeds of which are then assumed to have been used to repurchase outstanding stock using the treasury stock method) and the assumed conversion of convertible notes.

Basic net loss per share attributable to Vertex common shareholders is based upon the weighted-average number of common shares outstanding during the period, excluding restricted stock that has been issued but is not yet vested. Diluted net loss per share attributable to Vertex common shareholders is based upon the weighted-average number of common shares outstanding during the period plus additional weighted-average common equivalent shares outstanding during the period when the effect is dilutive.

Recent Accounting Pronouncements

The Company did not adopt any new accounting pronouncements during 2013 that had a material effect on the Company’s consolidated financial statements.

F-15

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

B. Collaborative Arrangements

Janssen Pharmaceutica NV

In 2006, the Company entered into a collaboration agreement with Janssen (the "2006 Janssen Agreement") for the development, manufacture and commercialization of telaprevir, which Janssen began marketing under the brand name INCIVO in certain of its territories in September 2011. Under the collaboration agreement, Janssen has exclusive rights to commercialize telaprevir in its territories including Europe, South America, the Middle East, Africa and Australia. In November 2013, the Company and Janssen amended the collaboration agreement (the "2013 Janssen Amendment," as amended the "Janssen Agreement").

Janssen made a $165.0 million up-front license payment to the Company in 2006. The Company amortized the up-front license payment over the Company’s estimated period of performance under the Janssen Agreement through November 2013. As of November 2013, the effective date of the 2013 Janssen Amendment, there was $32.1 million remaining in deferred revenues related to this up-front license payment.

In addition to the up-front license payment, Janssen made contingent milestone payments for successful development, approval and launch of telaprevir as a product in its territories. At the inception of the 2006 Janssen Agreement, the Company determined that all of the contingent milestones were substantive and would result in revenues in the period in which the milestone was achieved. The Company earned $350.0 million of these contingent milestone payments, including a $50.0 million milestone payment earned in the first quarter of 2011 in connection with the European Medicines Agency’s acceptance of the marketing authorization application for INCIVO and an aggregate of $200.0 million in milestone payments earned in the third quarter of 2011 related to the approval of INCIVO by the European Commission and the launch of INCIVO in the European Union. The Company will not receive any further milestone payments under the Janssen Agreement.

Under the Janssen Agreement, each party incurs internal and external reimbursable expenses and is reimbursed by the other party for 50% of these expenses. The Company recognized the full amount of the reimbursable costs it incurred as research and development expenses on its consolidated statements of operations. The Company recognized, including in 2013, the amounts Janssen was obligated to pay the Company with respect to reimbursable expenses, net of reimbursable expenses incurred by Janssen, as collaborative revenues. During 2012 and 2011, Janssen incurred more reimbursable costs than the Company, and the net amounts payable by the Company to reimburse Janssen were recorded as a reduction of collaborative revenues. Each of the parties were responsible for drug supply in its territories. Until December 31, 2013, the Company provided Janssen certain services through the Company’s third-party manufacturing network for telaprevir.

Janssen paid the Company a tiered royalty averaging in the mid-20% range as a percentage of net sales of INCIVO in Janssen’s territories through the fourth quarter of 2013. In addition, Janssen is responsible for certain third-party royalties on net sales of INCIVO in its territories.

Pursuant to the 2013 Janssen Amendment, (i) Janssen made a payment of $152.0 million to the Company in the fourth quarter of 2013; (ii) Janssen's obligations to pay the Company royalties on net sales of INCIVO (telaprevir) terminated after the fourth quarter of 2013; and (iii) Janssen received a fully-paid license to commercialize INCIVO in its territories, subject to the continued payment of certain third-party royalties on its net sales of INCIVO. The Company and Janssen continue to perform activities related to the telaprevir development program.

The Company determined the 2013 Janssen Amendment was a material modification to the 2006 Janssen Agreement because there was a material change to the consideration and deliverables under the agreement and determined that there is one undelivered element under the agreement, as amended, which is the continuation of certain telaprevir development activities. The Company recognized $182.4 million of collaborative revenues pursuant to the Janssen Agreement in the fourth quarter of 2013. This amount was primarily attributable to (i) the residual consideration received from Janssen, including the $152.0 million fourth quarter 2013 payment and the remaining deferred revenues related to the 2006 up-front payment less (ii) the best estimate of selling price for the remaining telaprevir development activities. As of December 31, 2013, the remaining deferred revenue balance related to the Janssen collaboration was $5.0 million and will be recognized as collaborative revenues as telaprevir development program activities are completed.

F-16

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

The agreement will continue in effect until the expiration of Janssen’s third-party royalty obligations, which expire on a country-by-country basis on the later of (a) the last-to-expire patent covering INCIVO or (b) the last required payment by Janssen to the Company pursuant to the agreement. In the European Union, the Company has a patent covering the composition-of-matter of INCIVO that expires in 2026.

During the three years ended December 31, 2013, the Company recognized the following revenues attributable to the Janssen collaboration:

	2013		2012			2011
	(in thousands)
Royalty revenues	$	130,724	$	117,592		$	20,289
Collaborative revenues:
Up-front and amendment payments revenues	$	190,345	$	12,428		$	12,428
Milestone revenues	—		—			250,000
Net reimbursement (payment) for telaprevir development costs	2,793		(3,507		)	(8,418		)
Reimbursement for manufacturing services	10,299		7,257			20,383
Total collaborative revenues attributable to the Janssen collaboration	$	203,437	$	16,178		$	274,393
Total revenues attributable to the Janssen collaboration	$	334,161	$	133,770		$	294,682

Mitsubishi Tanabe Pharma Corporation

The Company has a collaboration agreement (the “MTPC Agreement”) with Mitsubishi Tanabe Pharma Corporation ("Mitsubishi Tanabe") pursuant to which Mitsubishi Tanabe has a fully-paid license to manufacture and commercialize TELAVIC (the brand name under which Mitsubishi Tanabe is marketing telaprevir) in Japan and other specified countries in Asia. In September 2011, Mitsubishi Tanabe obtained approval to market TELAVIC in Japan.

The parties entered into the MTPC Agreement in 2004 and amended it in 2009. Pursuant to the MTPC Agreement, Mitsubishi Tanabe provided financial and other support for the development and commercialization of telaprevir, made a $105.0 million payment in connection with the 2009 amendment of the collaboration agreement and made a $65.0 million commercial milestone payment recognized as collaborative revenues in the fourth quarter of 2011. There are no further payments under this collaboration agreement. Mitsubishi Tanabe is responsible for its own development and manufacturing costs in its territory.

Mitsubishi Tanabe may terminate the MTPC Agreement at any time without cause upon 60 days’ prior written notice to the Company. The MTPC Agreement also may be terminated by either party for a material breach by the other, subject to notice and cure provisions. Unless earlier terminated, the MTPC Agreement will continue in effect until the expiration of the last-to-expire patent covering telaprevir in Mitsubishi Tanabe's territories. In Japan, the Company has a patent covering the composition-of-matter of telaprevir that expires in 2021.

The $105.0 million payment that the Company received in the third quarter of 2009 in connection with the amendment to the MTPC Agreement was a nonrefundable, up-front license fee, and revenues related to the 2009 payment were recognized on a straight-line basis over the period of performance of the Company’s obligations under the amended agreement. The final deferred revenues related to the 2009 up-front license payment were recognized in April 2012. In connection with the amendment to the MTPC Agreement, the Company supplied manufacturing services to Mitsubishi Tanabe, until April 2012, through the Company’s third-party manufacturing network for telaprevir.

F-17

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

The Company did not record any collaborative revenues attributable to the MTPC Agreement in 2013. The table below sets forth the total collaborative revenues attributable to the MTPC Agreement for 2012 or 2011:

	2012		2011
	(in thousands)
Amortized portion of up-front payments	$	12,744	$	38,232
Milestone revenues	485		68,515
Payments for manufacturing services	5,650		14,928
Total collaborative revenues attributable to the Mitsubishi Tanabe collaboration	$	18,879	$	121,675

Cystic Fibrosis Foundation Therapeutics Incorporated

In April 2011, the Company entered into an amendment (the “April 2011 Amendment”) to its existing collaboration agreement with Cystic Fibrosis Foundation Therapeutics Incorporated (“CFFT”) pursuant to which CFFT agreed to provide financial support for (i) development activities for VX-661, a corrector compound discovered under the collaboration, and (ii) additional research and development activities directed at discovering new corrector compounds.

The Company entered into the original collaboration agreement with CFFT in 2004 and amended it several times prior to 2011 to, among other things, provide partial funding for its cystic fibrosis drug discovery and development efforts. In 2006, the Company received a $1.5 million milestone payment from CFFT. There are no additional milestones payable by CFFT to the Company pursuant to the collaboration agreement, as amended. Under the April 2011 Amendment, CFFT agreed to provide the Company with up to $75.0 million in funding over approximately 5 years for corrector-compound research and development activities. The Company retains the right to develop and commercialize KALYDECO (ivacaftor), VX-809, VX-661 and any other compounds discovered during the course of the research collaboration with CFFT. The Company recognized collaborative revenues from this collaboration of $14.3 million, $17.0 million and $13.7 million, respectively, in 2013, 2012 and 2011.

In the original agreement, as amended prior to the April 2011 Amendment, the Company agreed to pay CFFT tiered royalties calculated as a percentage, ranging from single digits to sub-teens, of annual net sales of any approved drugs discovered during the research term that ended in 2008, including KALYDECO, lumacaftor and VX-661. The April 2011 Amendment provides for a tiered royalty in the same range on net sales of corrector compounds discovered during the research term that began in 2011. In each of the third quarter of 2012 and the first quarter of 2013, CFFT earned a commercial milestone payment of $9.3 million from the Company upon achievement of certain sales levels for KALYDECO. These milestones were reflected in the Company's cost of product revenues. There are no additional commercial milestone payments payable by the Company to CFFT related to sales levels for KALYDECO. The Company also is obligated to make a total of two one-time commercial milestone payments upon achievement of certain sales levels for corrector compounds such as lumacaftor or VX-661.

The Company began marketing KALYDECO in the United States in the first quarter of 2012 and began marketing KALYDECO in certain countries in the European Union in the third quarter of 2012. The Company has royalty obligations to CFFT for each compound commercialized pursuant to this collaboration until the expiration of patents covering that compound. The Company has patents in the United States and European Union covering the composition-of-matter of ivacaftor that expire in 2027 and 2025, respectively, subject to potential patent life extensions. The Company has patent applications in the United States and European Union covering the composition-of-matter of lumacaftor that expire in 2026, subject to potential patent life extensions. CFFT may terminate its funding obligations under the collaboration, as amended, in certain circumstances, in which case there will be a proportional adjustment to the royalty rates and commercial milestone payments for certain corrector compounds. The collaboration also may be terminated by either party for a material breach by the other, subject to notice and cure provisions.

F-18

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

Alios BioPharma, Inc.

License and Collaboration Agreement

In June 2011, the Company entered into a license and collaboration agreement (the “Alios Agreement”) with Alios, a privately-held biotechnology company. The Company and Alios are collaborating on the research, development and commercialization of an HCV nucleotide analogue discovered by Alios, ALS-2200 (now formulated as VX-135), which is designed to act on the HCV polymerase.

Under the terms of the Alios Agreement, the Company received exclusive worldwide rights to ALS-2200 (VX-135) and ALS-2158, a second HCV nucleotide analogue discovered by Alios that was developed pursuant to the Alios agreement through the third quarter of 2012. Alios and the Company began clinical development of ALS-2200 (VX-135) and ALS-2158 in December 2011. The Company is responsible for all costs related to development, commercialization and manufacturing of each compound licensed to the Company pursuant to the Alios Agreement and provided funding to Alios to conduct the Phase 1 clinical trials for ALS-2200 and ALS-2158. In addition, the Company provided funding for a research program, which ended in 2013, directed to the discovery of additional HCV nucleotide analogues that act on the HCV polymerase.

Upon entering into the Alios Agreement, the Company paid Alios a $60.0 million up-front payment. As of December 31, 2013, Alios had earned an aggregate of $60.0 million in development milestone payments pursuant to the Alios Agreement. The Alios Agreement provides for development milestone payments to Alios of up to an additional $312.5 million if VX-135 is approved and commercialized. In addition, Alios is eligible to receive commercial milestone payments of up to $750.0 million, as well as tiered royalties on net sales of VX-135.

The Company may terminate the Alios Agreement (i) upon 30 days’ notice to Alios if the Company ceases development after VX-135 has experienced a technical failure and/or (ii) upon 60 days’ notice to Alios at any time after the Company completes Phase 2a clinical trials. The Alios Agreement also may be terminated by either party for a material breach by the other, and by Alios for the Company’s inactivity or if the Company challenges certain Alios patents, in each case subject to notice and cure provisions. Unless earlier terminated, the Alios Agreement will continue in effect until the expiration of the Company’s royalty obligations, which expire on a country-by-country basis on the later of (a) the date the last-to-expire patent covering a licensed product expires or (b) 10 years after the first commercial sale in the country.

Alios is continuing to operate as a separate entity, is engaged in other programs directed at developing novel drugs that are not covered by the Alios Agreement and maintains ownership of the underlying patent rights that are licensed to the Company pursuant to the Alios Agreement. Under applicable accounting guidance, the Company determined that Alios was a VIE, its license to VX-135 and ALS-2158 was a variable interest in Alios, that Alios was a business and that the Company was Alios’ primary beneficiary for the period from June 13, 2011 through December 31, 2013. The Company based these determinations on, among other factors, the significance to Alios of the licensed compounds and on the Company’s power, through the joint steering committee for the licensed compounds established under the Alios Agreement, to direct the activities that most significantly affect the economic performance of Alios.

Accordingly, the Company consolidated Alios’ financial statements with the Company’s consolidated financial statements from June 13, 2011 through December 31, 2013. However, the Company’s interests in Alios were limited to those accorded to the Company in the Alios Agreement. In particular, the Company did not acquire any equity interest in Alios, any interest in Alios’ cash and cash equivalents or any control over Alios’ activities that do not relate to the Alios Agreement. Alios does not have any right to the Company’s assets except as provided in the Alios Agreement.

As of December 31, 2013, the Company determined that it no longer had a variable interest in Alios as a whole and did not possess the power to direct the activities that most significantly affect the economic performance of Alios based on, among other factors, the decline in significance to Alios of the licensed HCV nucleotide analogue program. A full impairment charge of $250.6 million related to the Alios collaboration and a benefit for income taxes of $102.1 million was recorded attributable to Alios. The Company deconsolidated Alios based on this conclusion as of December 31, 2013. The deconsolidation resulted in a gain of $68.2 million recorded in other income (expense), net attributable to Vertex in the consolidated statement of operations for the year ended December 31, 2013. The gain of $68.2 million was approximately the difference between (i) losses the Company recorded in 2011 and 2012 based on increases in the fair value of contingent

F-19

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

milestone and royalty payments payable by the Company to Alios and (ii) the aggregate of $120.0 million in up-front and milestone payments that the Company has made to Alios to date pursuant to the Alios Agreement.

The Company continues to have significant continuing involvement with Alios due to the Alios Agreement; therefore, the deconsolidation of Alios is not presented as discontinued operations in the Company's consolidated financial statements as of December 31, 2013. The Company will evaluate whether it continues to have significant continuing involvement with Alios for a period of one year from the December 31, 2013 deconsolidation date.

Please refer to Note J, "Intangible Assets and Goodwill," for further information regarding the impairment of the HCV nucleotide analogue program.

Noncontrolling Interest (Alios)

Prior to the deconsolidation, the Company recorded noncontrolling interest (Alios) on two lines on its consolidated balance sheets. The noncontrolling interest (Alios) was reflected on two separate lines because Alios has both common shareholders and preferred shareholders that are entitled to redemption rights in certain circumstances. The Company recorded net loss (income) attributable to noncontrolling interest (Alios) on its consolidated statements of operations, reflecting Alios' net loss (income) for the reporting period, adjusted for changes in the fair value of contingent milestone payments and royalties payable by the Company to Alios, which was evaluated each reporting period. A summary of net loss (income) attributable to noncontrolling interest (Alios) for the three years ended December 31, 2013 is as follows:

	2013			2012			2011
	(in thousands)
Loss before provision for (benefit from) income taxes	$	283,747		$	20,044		$	9,536
Decrease (increase) in fair value of contingent milestone and royalty payments	124,920			(114,970		)	(69,950		)
Provision for (benefit from) income taxes	(166,145		)	39,029			48,809
Net loss (income) attributable to noncontrolling interest (Alios)	$	242,522		$	(55,897	)	$	(11,605	)

In 2012 and 2011, the fair value of the contingent milestone payments and royalties payable by Vertex to Alios related to the in-licensed HCV nucleotide analogue program increased by $115.0 million and $70.0 million, respectively, due to the advancement of the Company's HCV nucleotide program, including the positive data the Company received in 2012 from a Phase 1 clinical trial that evaluated ALS-2200. As of December 31, 2013, the Company concluded that the fair value of the contingent milestone and royalty payments was zero. This determination was based on, among other factors, (a) safety, tolerability and efficacy data from a Phase 2a clinical trial of VX-135 in combination with daclatasvir that the Company received in late December 2013 and analyzed and announced in January 2014, (b) the continuing partial clinical hold on VX-135 by the U.S. Food and Drug Administration ("FDA"), (c) a review of the existing and emerging data regarding all-oral regimens for HCV infection being developed by the Company's competitors, and (d) the risks associated with establishing collaborations for the potential late-stage development of a combination regimen containing VX-135 and drug candidates controlled by third parties.

The Company used present-value models to determine the estimated fair value of the contingent milestone and royalty payments until it deconsolidated Alios, based on assumptions regarding the probability of achieving the relevant milestones, estimates regarding the time to develop drug candidates, estimates of future product sales and the appropriate discount and tax rates. The Company based its estimate of the probability of achieving the relevant milestones on industry data for similar assets and its own experience. The discount rates used in the valuation model represented a measure of credit risk associated with settling the liability. Significant judgment was used in determining the appropriateness of these assumptions at each reporting period.

F-20

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

Alios Balance Sheet Information

The Company included items related to Alios on the Company's consolidated balance sheet as of December 31, 2012. Due to the deconsolidation of Alios as of December 31, 2013, these items were not included on the Company's consolidated balance sheet as of December 31, 2013. The following table summaries items related to the Alios included on the Company's consolidated balance sheet as of December 31, 2012.

	As of December 31, 2012
		(in thousands)
Restricted cash and cash equivalents (Alios)		$	69,983
Prepaid expenses and other current assets		$	672
Property and equipment, net		$	1,728
Intangible assets		$	250,600
Other assets		$	861
Accounts payable		$	1,054
Accrued expenses		$	6,099
Income taxes payable (Alios)		$	715
Deferred tax liability		$	152,781
Other liabilities, excluding current portion		$	910
Redeemable noncontrolling interest (Alios)		$	38,530
Noncontrolling interest (Alios)		$	196,672

As of December 31, 2012, the Company recorded Alios’ cash and cash equivalents as restricted cash and cash equivalents (Alios) because (i) the Company did not have any interest in or control over Alios’ cash and cash equivalents and (ii) the Alios Agreement did not provide for these assets to be used for the development of the assets that the Company licenses from Alios pursuant to the Alios Agreement. Assets recorded as a result of consolidating Alios’ financial condition into the Company’s consolidated balance sheet did not represent additional assets that could have been used to satisfy claims against the Company’s general assets.

F-21

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

C. Net Income (Loss) Per Share Attributable to Vertex Common Shareholders

The following table sets forth the computation of basic and diluted net income (loss) per share for the three years ended December 31, 2013:

	2013			2012			2011
	(in thousands, except per share amounts)
Basic net income (loss) attributable to Vertex per common share calculation:
Net income (loss) attributable to Vertex common shareholders	$	(445,028	)	$	(107,032	)	$	29,574
Less: Undistributed earnings allocated to participating securities	—			—			(291		)
Net income (loss) attributable to Vertex common shareholders—basic	$	(445,028	)	$	(107,032	)	$	29,283
Basic weighted-average common shares outstanding	224,906			211,946			204,891
Basic net income (loss) attributable to Vertex per common share	$	(1.98	)	$	(0.50	)	$	0.14
Diluted net income (loss) attributable to Vertex per common share calculation:
Net income (loss) attributable to Vertex common shareholders	$	(445,028	)	$	(107,032	)	$	29,574
Less: Undistributed earnings allocated to participating securities	—			—			(285		)
Net income (loss) attributable to Vertex common shareholders—diluted	$	(445,028	)	$	(107,032	)	$	29,289
Weighted-average shares used to compute basic net income (loss) per common share	224,906			211,946			204,891
Effect of potentially dilutive securities:
Stock options	—			—			3,863
Other	—			—			53
Weighted-average shares used to compute diluted net income (loss) per common share	224,906			211,946			208,807
Diluted net income (loss) attributable to Vertex per common share	$	(1.98	)	$	(0.50	)	$	0.14

The Company did not include the securities described in the following table in the computation of the diluted net income (loss) attributable to Vertex per common share calculations because the effect would have been anti-dilutive during each such period:

	2013	2012	2011
	(in thousands)
Stock options	15,729	19,726	9,626
Convertible senior subordinated notes	—	8,192	8,192
Unvested restricted stock and restricted stock units	2,165	2,350	8

D. Fair Value Measurements

The fair value of the Company’s financial assets and liabilities reflects the Company’s estimate of amounts that it would have received in connection with the sale of the assets or paid in connection with the transfer of the liabilities in an orderly transaction between market participants at the measurement date. In connection with measuring the fair value of its assets and liabilities, the Company seeks to maximize the use of observable inputs (market data obtained from sources independent from the Company) and to minimize the use of unobservable inputs (the Company’s assumptions about how market participants would price assets and liabilities). The following fair value hierarchy is used to classify assets and liabilities based on the observable inputs and unobservable inputs used in order to value the assets and liabilities:

Level 1:	Quoted prices in active markets for identical assets or liabilities. An active market for an asset or liability is a market in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis.
Level 2:	Observable inputs other than Level 1 inputs. Examples of Level 2 inputs include quoted prices in active markets for similar assets or liabilities and quoted prices for identical assets or liabilities in markets that are not active.
Level 3:	Unobservable inputs based on the Company’s assessment of the assumptions that market participants would use in pricing the asset or liability.

F-22

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

The Company’s investment strategy is focused on capital preservation. The Company invests in instruments that meet the credit quality standards outlined in the Company’s investment policy. This policy also limits the amount of credit exposure to any one issue or type of instrument. As of December 31, 2013, the Company’s investments were in money market funds, short-term government-sponsored enterprise securities, corporate debt securities and commercial paper.

As of December 31, 2013, all of the Company’s financial assets that were subject to fair value measurements were valued using observable inputs. The Company’s financial assets valued based on Level 1 inputs consisted of a money market funds and government-sponsored enterprise securities. The Company’s financial assets valued based on Level 2 inputs consisted of corporate debt securities and commercial paper, which consisted of investments in highly-rated investment-grade corporations. During 2013, 2012 and 2011, the Company did not record an other-than-temporary impairment charge related to its financial assets.

The following table sets forth the Company’s financial assets subject to fair value measurements:

	Fair Value Measurements as of December 31, 2013
			Fair Value Hierarchy
	Total		Level 1		Level 2		Level 3
	(in thousands)
Financial assets carried at fair value:
Cash equivalents:
Money market funds	$	255,689	$	255,689	$	—	$	—
Marketable securities:
Government-sponsored enterprise securities	600,450		600,450		—		—
Commercial paper	83,493		—		83,493		—
Corporate debt securities	211,834		—		211,834		—
Total	$	1,151,466	$	856,139	$	295,327	$	—

F-23

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

E. Marketable Securities

A summary of the Company’s cash, cash equivalents and marketable securities is shown below:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
December 31, 2013
Cash and cash equivalents:
Cash and money market funds	$	569,299	$	—	$	—		$	569,299
Total cash and cash equivalents	$	569,299	$	—	$	—		$	569,299
Marketable securities:
Government-sponsored enterprise securities (due within 1 year)	$	600,496	$	7	$	(53	)	$	600,450
Commercial paper (due within 1 year)	83,384		109		—			83,493
Corporate debt securities (due within 1 year)	189,674		14		(34		)	189,654
Corporate debt securities (due after 1 year through 5 years)	22,181		6		(7		)	22,180
Total marketable securities	$	895,735	$	136	$	(94	)	$	895,777
Total cash, cash equivalents and marketable securities	$	1,465,034	$	136	$	(94	)	$	1,465,076
December 31, 2012
Cash and cash equivalents:
Cash and money market funds	$	489,407	$	—	$	—		$	489,407
Total cash and cash equivalents	$	489,407	$	—	$	—		$	489,407
Marketable securities:
U.S. Treasury securities (due within 1 year)	$	111,350	$	2	$	(2	)	$	111,350
Government-sponsored enterprise securities (due within 1 year)	440,181		49		(5		)	440,225
Commercial paper (due within 1 year)	225,294		155		—			225,449
Corporate debt securities (due within 1 year)	15,429		1		(1		)	15,429
Corporate debt securities (due after 1 year through 5 years)	39,358		10		(13		)	39,355
Total marketable securities	$	831,612	$	217	$	(21	)	$	831,808
Total cash, cash equivalents and marketable securities	$	1,321,019	$	217	$	(21	)	$	1,321,215

Alios’ $70.0 million of cash and money market funds as of December 31, 2012, recorded on the Company’s consolidated balance sheet in “Restricted cash and cash equivalents (Alios),” are not included in the above table.

In December 2013, the Company initiated a hedging program intended to mitigate the changes in foreign exchange rates for a portion of the Company’s product revenues denominated in Euros, which included foreign currency forward contracts that were designated as cash flow hedges. The notional amount of Euro denominated foreign currency forward contracts as of December 31, 2013 was $17.5 million. The changes in fair value of these foreign currency forward contracts included in accumulated other comprehensive loss and the gross fair value of foreign currency forward assets and liabilities included on the consolidated balance sheet as of December 31, 2013 were not material.

F-24

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

F. Accumulated Other Comprehensive Loss

The following table summarizes the changes in accumulated other comprehensive loss by component:

	Foreign currency translation adjustment			Unrealized holding gains on marketable securities			Unrealized losses on foreign currency forward contracts			Total
	(in thousands)
Balance at December 31, 2012	$	(746	)	$	196		$	—		$	(550	)
Other comprehensive income (loss) before reclassifications	421			(154		)	(23		)	244
Amounts reclassified from accumulated other comprehensive loss	—			—			—			—
Net current period other comprehensive income (loss)	421			(154		)	(23		)	244
Balance at December 31, 2013	$	(325	)	$	42		$	(23	)	$	(306	)

For the year ended December 31, 2013, there were no amounts reclassified from accumulated other comprehensive loss.

G. Inventories

Inventories consisted of the following:

	As of December 31,
	2013		2012
	(in thousands)
Raw materials	$	489	$	3,754
Work-in-process	9,981		11,317
Finished goods	3,677		15,393
Total	$	14,147	$	30,464

In 2013, the Company recorded within cost of product revenues $10.4 million of write-offs for excess and obsolete inventories. In 2012, the Company recorded within cost of product revenues $133.2 million of write-offs for excess and obsolete INCIVEK inventories related to declining sales. The write-offs for excess and obsolete inventories of $10.4 million and $133.2 million in 2013 and 2012, respectively, affected the net loss attributable to Vertex per share, net of tax, by $0.05 and $0.61 in 2013 and 2012, respectively.

H. Property and Equipment

Property and equipment, net consisted of the following:

	As of December 31,
	2013			2012
	(in thousands)
Buildings	$	506,056		$	—
Furniture and equipment	190,555			173,766
Leasehold improvements	163,019			123,770
Software	102,520			101,276
Computers	43,096			40,779
Construction-in-process	—			290,703
Total property and equipment, gross	1,005,246			730,294
Less: accumulated depreciation	(308,335		)	(296,685		)
Total property and equipment, net	$	696,911		$	433,609

F-25

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

Buildings as of December 31, 2013 and construction-in-process as of December 31, 2012, related to construction costs for the buildings at Fan Pier, which were placed in service in 2013. Please refer to Note I, "Fan Pier Leases," for further information.

Total property and equipment, gross, as of December 31, 2013 and 2012, included $76.4 million and $30.1 million, respectively, for property and equipment recorded under capital leases. Accumulated depreciation, as of December 31, 2013 and 2012, included $3.8 million and $1.1 million, respectively, for property and equipment recorded under capital leases. Included in property and equipment, net as of December 31, 2013 were $5.5 million and $0.5 million in capitalized internally developed software costs and related amortization, respectively. There were no such costs included in property and equipment, net as of December 31, 2012.

The Company recorded depreciation expense of $47.3 million, $35.7 million and $28.9 million, respectively, in 2013, 2012 and 2011.

I. Fan Pier Leases

In 2011, the Company entered into two lease agreements, pursuant to which the Company leases approximately 1.1 million square feet of office and laboratory space in two buildings (the "Buildings") at Fan Pier in Boston, Massachusetts (the “Fan Pier Leases”). The Company commenced lease payments in December 2013, and will make lease payments pursuant to the Fan Pier Leases through December 2028. The Company has an option to extend the term of the Fan Pier Leases for an additional 10 years.

Because the Company was involved in the construction project, including having responsibility to pay for a portion of the costs of finish work and structural elements of the Buildings, the Company was deemed for accounting purposes to be the owner of the Buildings during the construction period. Therefore, the Company recorded project construction costs incurred by the landlord as an asset and a related financing obligation during the construction period. The Company evaluated the Fan Pier Leases in the fourth quarter of 2013 and determined that the Fan Pier Leases did not meet the criteria for “sale-leaseback” treatment. This determination was based on, among other things, the Company's continuing involvement with the property in the form of non-recourse financing to the lessor. Accordingly, the Company began depreciating the asset and incurring interest expense related to the financing obligation during the fourth quarter of 2013. The Company bifurcates its lease payments pursuant to the Fan Pier Leases into (i) a portion that is allocated to the Buildings and (ii) a portion that is allocated to the land on which the Buildings were constructed. The portion of the lease obligations allocated to the land is treated as an operating lease that commenced in 2011.

Property and equipment, net, included $506.1 million and $290.7 million as of December 31, 2013 and 2012, respectively, related to construction costs for the Buildings. The construction financing lease obligations related to the Buildings on the Company's consolidated balance sheets were $440.9 million and $268.0 million, respectively, as of December 31, 2013 and 2012.

J. Intangible Assets and Goodwill

Intangible Assets

As of December 31, 2013, the Company had no intangible assets recorded on its consolidated balance sheet. The intangible assets that were previously reflected on the Company's consolidated balance sheets related to drug candidates for the treatment of HCV infection. The field of HCV infection treatment is highly competitive and characterized by rapid technological advances and the development of drug candidates for the treatment of HCV infection is subject to numerous risks. Two of the Company's competitors received approval in the fourth quarter of 2013 for new treatment regimens for HCV infection that include pegylated-interferon and ribavirin, and several of the Company's competitors are conducting Phase 3 clinical trials evaluating all-oral combinations of their drug candidates for the treatment of HCV infection.

ViroChem Acquisition

As of December 31, 2010, the intangible assets acquired from ViroChem that were reflected on the Company's consolidated balance sheet related to two drug candidates, VX-222 and VX-759. VX-222 and VX-759 had estimated fair

F-26

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

values on December 31, 2010 of $412.9 million and $105.8 million, respectively. In the third quarter of 2011, the Company determined that the fair value of VX-759 had become impaired and that its fair value was zero. As a result, the Company recorded an impairment charge in 2011 of $105.8 million that was reflected as an intangible asset impairment charge on the Company's consolidated statement of operations. In connection with this impairment charge, the Company recorded a benefit from income taxes of $32.7 million. In 2011, the decrease to the Company's net income attributable to Vertex related to this impairment charge, net of tax credit, was $73.1 million, and the net decrease to the Company's net income per share attributable to Vertex common shareholders was $0.35 per diluted share.

In 2013, the Company determined that there were indicators that the value of the VX-222 intangible asset had become impaired. This determination was based on (a) preliminary safety, tolerability and efficacy data from a Phase 2 clinical trial of VX-222, telaprevir and ribavirin, which was received in March 2013 and analyzed through April 2013 and (b) a review of the existing and emerging data regarding all-oral regimens for HCV infection being developed by the Company's competitors that appeared to be generally well tolerated with high sustained viral response rates for treatment-naïve patients with genotype 1 HCV infection. After evaluating the data from this Phase 2 clinical trial, the Company determined that regimens containing VX-222 were unlikely to be competitive with the treatment regimens being developed by the Company's competitors. The Company evaluated the fair value of VX-222 from the perspective of a market participant and based on this analysis determined that the fair value of VX-222 was zero as of March 31, 2013. Accordingly, the Company recorded a $412.9 million impairment charge in 2013. In connection with this impairment charge, the Company recorded a credit of $127.6 million in its provision for income taxes. In 2013, the increase to the Company's net loss attributable to Vertex related to this impairment charge, net of the tax credit, was $285.3 million, and the net increase to the Company's net loss per share attributable to Vertex common shareholders was $1.27 per share.

Alios Collaboration

In June 2011, the Company recorded $250.6 million of intangible assets on its consolidated balance sheet based on the Company's estimate of the fair value of Alios' HCV nucleotide analogue program, including the intellectual property related to ALS-2200 and ALS-2158. In the third quarter of 2012, after the Company discontinued the development of ALS-2158, the Company evaluated the Alios HCV nucleotide analogue program for impairment. The Company determined that there was no impairment to the program in the third quarter of 2012 because of the advancement of ALS-2200 (now formulated as VX-135).

In July 2013, the FDA placed a partial clinical hold on VX-135, which is being evaluated in Phase 2 clinical development. The partial clinical hold, which prevents the Company from further evaluation of VX-135 in the United States, remains in place as of the date of this filing.

In connection with preparing its financial statements for 2013, the Company determined that there were indicators that the value of the HCV nucleotide analogue program intangible asset had become impaired. This determination was based on, among other factors, (a) safety, tolerability and efficacy data from a Phase 2a clinical trial of VX-135 in combination with daclatasvir that the Company received in late December 2013 and analyzed and announced in January 2014, (b) the continuing partial clinical hold on VX-135 by the FDA, (c) a review of the existing and emerging data regarding all-oral regimens for HCV infection being developed by the Company's competitors, and (d) the risks associated with establishing collaborations for the potential late-stage development of a combination regimen containing VX-135 and drug candidates controlled by third parties. Based on these revised estimates, the Company evaluated the fair value of VX-135 from the perspective of a market participant and determined that the fair value of VX-135 was zero as of December 31, 2013. Accordingly, a $250.6 million impairment charge and a benefit from income taxes of $102.1 million was recorded in the fourth quarter of 2013.

Goodwill

As of December 31, 2013 and 2012, goodwill of $31.0 million was recorded on the Company's consolidated balance sheets. There was no change to goodwill during the year ended December 31, 2013.

F-27

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

K. Accrued Expenses and Other Liabilities, Current Portion

Accrued expenses consisted of the following:

	As of December 31,
	2013		2012
	(in thousands)
Product revenue allowances	$	85,510	$	69,936
Payroll and benefits	76,785		62,140
Research, development and commercial contract costs	52,468		63,960
Royalty payable	18,334		29,007
Other	16,241		18,932
Professional fees	10,593		11,226
Taxes payable	8,362		2,182
Unrecognized tax benefits	2,784		4,106
Interest	—		3,395
Total	$	271,077	$	264,884

Other liabilities, current portion consisted of the following:

	As of December 31,
	2013		2012
	(in thousands)
Deferred rent	$	16,652	$	14,302
Customer deposits	7,692		—
Other	392		5,400
Total	$	24,736	$	19,702

L. Convertible Senior Subordinated Notes

In September 2010, the Company completed an offering of $400.0 million in aggregate principal amount of 3.35% convertible senior subordinated notes due 2015 Notes (the "2015 Notes"). This offering resulted in $391.6 million of net proceeds to the Company. The underwriting discount and other expenses of $8.4 million were recorded as debt issuance costs and were included in other assets on the Company’s consolidated balance sheets. The 2015 Notes bore interest at the rate of 3.35% per annum, and the Company was required to make semi-annual interest payments on the outstanding principal balance of the 2015 Notes on April 1 and October 1 of each year.

The 2015 Notes were convertible at any time, at the option of the holder, into common stock at a price equal to approximately $48.83 per share, or 20.4794 shares of common stock per $1,000 principal amount of the 2015 Notes, subject to adjustment. If the closing price of the Company’s common stock exceeded 130% of the conversion price for at least 20 trading days within a period of 30 consecutive trading days, the Company had the right to redeem the 2015 Notes at its option at a redemption price equal to 100% of the principal amount of the 2015 Notes to be redeemed.

In the second quarter of 2013, the Company's common stock exceeded 130% of the conversion price of the 2015 Notes for at least 20 trading days within a period of 30 consecutive trading days, and the Company notified the holders of the 2015 Notes that it would redeem the 2015 Notes on June 17, 2013. In response to the Company's call of the 2015 Notes for redemption, in accordance with the provisions of the 2015 Notes, the holders of $399.8 million in aggregate principal amount of 2015 Notes elected to convert their 2015 Notes into the Company's common stock at the conversion price of approximately $48.83 per share. As a result of these conversions, the Company issued 8,188,448 shares of common stock. The remaining $0.2 million in aggregate principal amount of 2015 Notes was redeemed on June 17, 2013.

F-28

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

Pursuant to the terms of the 2015 Notes, the Company made an additional payment of $16.75 per $1,000 principal amount, payable in shares of the Company’s common stock, to the holders of the 2015 Notes that converted or redeemed their 2015 Notes after the Company called the 2015 Notes for redemption. These payments resulted in the issuance of an additional 87,109 shares of the Company's common stock. In the second quarter of 2013, the Company recognized an aggregate of $6.7 million in interest expense related to the 2015 Notes. Unamortized debt issuance costs for the 2015 Notes of $4.2 million were recorded as an offset to additional paid-in capital.

M. Common Stock, Preferred Stock and Equity Plans

The Company is authorized to issue 300,000,000 shares of common stock. Holders of common stock are entitled to one vote per share. Holders of common stock are entitled to receive dividends, if and when declared by the Company’s Board of Directors, and to share ratably in the Company’s assets legally available for distribution to the Company’s shareholders in the event of liquidation. Holders of common stock have no preemptive, subscription, redemption or conversion rights. The holders of common stock do not have cumulative voting rights.

The Company is authorized to issue 1,000,000 shares of preferred stock in one or more series and to fix the powers, designations, preferences and relative participating, option or other rights thereof, including dividend rights, conversion rights, voting rights, redemption terms, liquidation preferences and the number of shares constituting any series, without any further vote or action by the Company's shareholders. As of December 31, 2013 and 2012, the Company had no shares of preferred stock issued or outstanding.

Stock and Option Plans

The purpose of each of the Company’s stock and option plans is to attract, retain and motivate its employees, consultants and directors. Awards granted under these plans can be incentive stock options (“ISOs”), nonstatutory stock options (“NSOs”), restricted stock (“RSs”), restricted stock units (“RSUs”) or other equity-based awards, as specified in the individual plans.

Shares issued under all of the Company’s plans are funded through the issuance of new shares. The following table contains information about the Company’s equity plans:

			As of December 31, 2013
Title of Plan	Group Eligible	Type of Award Granted	Awards Outstanding	Additional Awards Authorized for Grant
2013 Stock and Option Plan	Employees, Non-employee Directors and Consultants	NSO, ISO, RS and RSU	1,170,827	2,129,173
2006 Stock and Option Plan	Employees, Non-employee Directors and Consultants	NSO, ISO, RS and RSU	15,748,949	3,282,178
1996 Stock and Option Plan	Employees, Non-employee Directors, Advisors and Consultants	NSO, ISO and RS	974,303	—
Total			17,894,079	5,411,351

All options granted under the Company’s 2013 Stock and Option Plan ("2013 Plan"), 2006 Stock and Option Plan (“2006 Plan”) and 1996 Stock and Option Plan were granted with an exercise price equal to the fair value of the underlying common stock on the date of grant. As of December 31, 2013, the stock and option plans under which the Company makes new equity awards are the Company’s 2006 Plan and 2013 Plan. Under the 2006 Plan and the 2013 Plan, no stock options can be awarded with an exercise price less than the fair market value on the date of grant. The Company’s shareholders authorized 3,300,000 shares for issuance pursuant to the 2013 Plan in 2013 and approved an increase in the number of shares authorized for issuance pursuant to the 2006 Plan of 3,000,000 shares in 2012.

During the three years ended December 31, 2013, grants to current employees and directors had a grant date that was the same as the date the award was approved by the Company’s Board of Directors. During the three years ended December 31, 2013, for grants to new employees and directors, the date of grant for awards was the employee’s first day of employment or

F-29

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

the date the director was elected to the Company’s Board of Directors. All options awarded under the Company’s stock and option plans expire not more than ten years from the grant date.

During the three years ended December 31, 2013, all shares of outstanding restricted stock and restricted stock units have been granted at a price equal to $0.01, the par value of the Company’s common stock. Vesting of options, restricted stock and restricted stock units generally is ratable over specified periods, usually four years, and is determined by the Company’s Board of Directors.

The following table summarizes information related to the outstanding and exercisable options during the year ended December 31, 2013:

	Stock Options		Weighted-average Exercise Price		Weighted-average Remaining Contractual Life	Aggregate Intrinsic Value
	(in thousands)		(per share)		(in years)	(in thousands)
Outstanding at December 31, 2012	19,726		$	38.09
Granted	4,840		$	57.87
Exercised	(6,995	)	$	35.28
Forfeited	(1,822	)	$	46.89
Expired	(20	)	$	46.64
Outstanding at December 31, 2013	15,729		$	44.40	6.67	$	481,311
Exercisable at December 31, 2013	7,950		$	38.84	5.13	$	283,146
Exercisable and Expected to Vest at December 31, 2013	14,967		$	43.95	6.56	$	463,885

The aggregate intrinsic value in the table above represents the total pre-tax amount, net of exercise price, that would have been received by option holders if all option holders had exercised all options with an exercise price lower than the market price on December 31, 2013, which was $74.21 based on the average of the high and low price of the Company’s common stock on that date.

The total intrinsic value (the amount by which the fair market value exceeded the exercise price) of stock options exercised during 2013, 2012 and 2011 was $291.6 million, $148.7 million and $90.5 million, respectively. The total cash received by the Company as a result of employee stock option exercises during 2013, 2012 and 2011 was $246.8 million, $172.8 million and $109.6 million, respectively.

The following table summarizes information about stock options outstanding and exercisable at December 31, 2013:

	Options Outstanding				Options Exercisable
Range of Exercise Prices	Number Outstanding	Weighted-average Remaining Contractual Life	Weighted-average Exercise Price		Number Exercisable	Weighted-average Exercise Price
	(in thousands)	(in years)	(per share)		(in thousands)	(per share)
$ 9.09–$20.00	432	2.37	$	15.37	432	$	15.37
$20.01–$30.00	1,055	5.74	$	29.38	812	$	29.23
$30.01–$40.00	6,842	5.07	$	36.55	4,773	$	36.06
$40.01–$50.00	4,136	8.74	$	46.32	787	$	46.62
$50.01–$60.00	1,713	7.16	$	53.78	874	$	54.35
$60.01–$70.00	80	9.08	$	65.54	14	$	63.20
$70.01-$80.00	87	9.31	$	77.55	9	$	77.73
$80.01–$88.18	1,384	9.50	$	83.11	249	$	82.13
Total	15,729	6.67	$	44.40	7,950	$	38.84

F-30

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

The following table summarizes the restricted stock activity of the Company during the year ended December 31, 2013:

	Restricted Stock		Weighted-average Grant-date Fair Value
	(in thousands)		(per share)
Unvested at December 31, 2012	2,270		$	42.92
Granted	1,356		$	62.16
Vested	(800	)	$	42.27
Cancelled	(780	)	$	51.47
Unvested at December 31, 2013	2,046		$	52.66

The total fair value of restricted stock that vested during 2013, 2012 and 2011 (measured on the date of vesting) was $50.9 million, $41.1 million and $34.6 million, respectively.

Employee Stock Purchase Plan

The Company has an employee stock purchase plan (the “ESPP”). The ESPP permits eligible employees to enroll in a twelve-month offering period comprising two six-month purchase periods. Participants may purchase shares of the Company’s common stock, through payroll deductions, at a price equal to 85% of the fair market value of the common stock on the first day of the applicable twelve-month offering period, or the last day of the applicable six-month purchase period, whichever is lower. Purchase dates under the ESPP occur on or about May 14 and November 14 of each year. In 2012, the Company's shareholders approved an increase in the number of shares of common stock authorized for issuance pursuant to the ESPP. As of December 31, 2013, there were 1,753,381 shares of common stock authorized for issuance pursuant to the ESPP.

In 2013, the following shares were issued to employees under the ESPP:

	Year Ended December 31, 2013
	(in thousands, except per share amount)
Number of shares	527
Average price paid per share	$	36.21

N. Stock-based Compensation Expense

The Company recognizes share-based payments to employees as compensation expense using the fair value method. The fair value of stock options and shares purchased pursuant to the ESPP is calculated using the Black-Scholes option pricing model. The fair value of restricted stock and restricted stock units typically is based on the intrinsic value on the date of grant. Stock-based compensation, measured at the grant date based on the fair value of the award, is typically recognized as expense ratably over the service period. The expense recognized over the service period includes an estimate of awards that will be forfeited.

The effect of stock-based compensation expense during the three years ended December 31, 2013 was as follows:

	2013		2012		2011
	(in thousands)
Stock-based compensation expense by line item:
Research and development expenses	$	81,467	$	71,533	$	75,574
Sales, general and administrative expenses	45,836		42,752		42,652
Total stock-based compensation expense included in costs and expenses	$	127,303	$	114,285	$	118,226

F-31

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

The stock-based compensation expense by type of award during the three years ended December 31, 2013 was as follows:

	2013			2012			2011
	(in thousands)
Stock-based compensation expense by type of award:
Stock options	$	85,067		$	79,047		$	83,098
Restricted stock and restricted stock units	36,479			29,194			30,708
ESPP share issuances	6,805			7,298			5,462
Less: stock-based compensation expense capitalized to inventories	(1,048		)	(1,254		)	(1,042		)
Total stock-based compensation expense included in costs and expenses	$	127,303		$	114,285		$	118,226

The Company capitalizes stock-based compensation expense to inventories, all of which is attributable to employees who supported the Company’s manufacturing operations for the Company's products.

The following table sets forth the Company’s unrecognized stock-based compensation expense, net of estimated forfeitures, as of December 31, 2013, by type of award and the weighted-average period over which that expense is expected to be recognized:

	As of December 31, 2013
	Unrecognized Expense Net of Estimated Forfeitures		Weighted-average Recognition Period
	(in thousands)		(in years)
Type of award:
Stock options	$	141,283	2.56
Restricted stock and restricted stock units	$	73,490	2.47
ESPP share issuances	$	5,956	0.67

Stock Options

The Company issues stock options with service conditions, which are generally the vesting periods of the awards. In 2009, the Company also issued, to certain members of senior management, stock options with performance conditions that vested upon the satisfaction of the performance conditions by the end of the first quarter of 2012. The Company uses the Black-Scholes option pricing model to estimate the fair value of stock options at the grant date. The Black-Scholes option pricing model uses the option exercise price as well as estimates and assumptions related to the expected price volatility of the Company’s stock, the rate of return on risk-free investments, the expected period during which the options will be outstanding, and the expected dividend yield for the Company’s stock to estimate the fair value of a stock option on the grant date. The options granted during 2013, 2012 and 2011 had a weighted-average grant-date fair value per share of $25.79, $19.72 and $20.88, respectively.

The fair value of each option granted during 2013, 2012 and 2011 was estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:

	2013		2012		2011
Expected stock price volatility	46.20	%	47.93	%	49.53	%
Risk-free interest rate	1.25	%	0.95	%	2.09	%
Expected term of options (in years)	5.81		5.78		5.74
Expected annual dividends	—		—		—

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VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

The weighted-average valuation assumptions were determined as follows:

• Expected stock price volatility: Options to purchase the Company’s stock with remaining terms of greater than one year are regularly traded in the market. Expected stock price volatility is calculated using the trailing one month average of daily implied volatilities prior to grant date.

• Risk-free interest rate: The Company bases the risk-free interest rate on the interest rate payable on U.S. Treasury securities in effect at the time of grant for a period that is commensurate with the assumed expected option term.

• Expected term of options: The expected term of options represents the period of time options are expected to be outstanding. The Company uses historical data to estimate employee exercise and post-vest termination behavior. The Company believes that all groups of employees exhibit similar exercise and post-vest termination behavior and therefore does not stratify employees into multiple groups in determining the expected term of options.

• Expected annual dividends: The estimate for annual dividends is $0.00 because the Company has not historically paid, and does not intend for the foreseeable future to pay, a dividend.

Restricted Stock and Restricted Stock Units

The Company issues restricted stock and restricted stock units with service conditions, which are generally the vesting periods of the awards. The Company also issues, to certain members of senior management, restricted stock and restricted stock units that vest upon the earlier of the satisfaction of (i) a performance condition or (ii) a service condition.

Employee Stock Purchase Plan

The weighted-average fair value of each purchase right granted during 2013, 2012 and 2011 was $21.08, $12.90 and $9.80, respectively. The following table reflects the weighted-average assumptions used in the Black-Scholes option pricing model for 2013, 2012 and 2011:

	2013		2012		2011
Expected stock price volatility	54.69	%	46.90	%	51.32	%
Risk-free interest rate	0.08	%	0.16	%	0.08	%
Expected term (in years)	0.74		0.74		0.72
Expected annual dividends	—		—		—

The expected stock price volatility for ESPP offerings is based on implied volatility. The Company bases the risk-free interest rate on the interest rate payable on U.S. Treasury securities in effect at the time of grant for a period that is commensurate with the assumed expected term. The expected term represents purchases and purchase periods that take place within the offering period. The expected annual dividends estimate is $0.00 because the Company has not historically paid, and does not for the foreseeable future intend to pay, a dividend.

O. September 2009 Financial Transactions

2012 Notes

In September 2009, the Company sold $155.0 million in aggregate of secured notes due 2012 (the “2012 Notes”) for an aggregate of $122.2 million pursuant to a note purchase agreement with Olmsted Park S.A. (the “Purchaser”). The 2012 Notes were issued at a discount and did not pay current interest prior to maturity. The 2012 Notes were scheduled to mature on October 31, 2012, subject to earlier mandatory redemption to the extent that specified milestone events set forth in the Company’s collaboration with Janssen occurred prior to October 31, 2012. In February 2011, the Company received a milestone payment of $50.0 million and subsequently redeemed $50.0 million of 2012 Notes pursuant to their terms. The remaining $105.0 million of 2012 Notes were redeemed on October 31, 2011, with the proceeds of milestone payments received from Janssen in October 2011. The 2012 Notes contained an embedded derivative related to the potential mandatory redemption or early repayment of the 2012 Notes at the face amount prior to their maturity date. The fair value of this

F-33

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

embedded derivative was evaluated quarterly, with changes in the fair value of the embedded derivative resulting in a corresponding gain or loss. The Company recorded quarterly interest expense related to the 2012 Notes using the effective interest rate method.

Sale of Contingent Milestone Payments

In September 2009, the Company entered into two purchase agreements with the Purchaser pursuant to which the Company sold its rights to an aggregate of $95.0 million in contingent milestone payments under the Janssen agreement related to the launch of telaprevir in the European Union, for nonrefundable payments totaling $32.8 million. The Purchaser received the $95.0 million in milestone payments from Janssen in the fourth quarter of 2011. The Company determined that this sale of a future revenue stream should be accounted for as a liability. The fair value of the rights sold to the Purchaser pursuant to the purchase agreements was evaluated each reporting period until the payments were received in the fourth quarter of 2011, with changes in the fair value of the derivative instruments based on the probability of achieving the milestones, the timing of achieving the milestones or discount rates resulting in a corresponding gain or loss.

Expenses Related to September 2009 Financial Transactions

The Company had no expenses related to these transactions in 2013 or 2012. The table below sets forth the total expenses related to the September 2009 financial transactions for 2011:

	2011
	(in thousands)
Expenses and Losses (Gains):
Interest expense related to 2012 Notes	$	21,687
Change in fair value of embedded derivative related to 2012 Notes	(400		)
Change in fair value of free-standing derivatives related to the sale of milestone payments	17,201
Total September 2009 financial transaction expenses	$	38,488

P. Sale of HIV Protease Inhibitor Royalty Stream

In 2008, the Company sold to a third party its rights to receive royalty payments from GlaxoSmithKline plc, net of royalty amounts to be earned by and due to a third party, for a one-time cash payment of $160.0 million. These royalty payments relate to net sales of HIV protease inhibitors, which had been developed pursuant to a collaboration agreement between the Company and GlaxoSmithKline plc. As of December 31, 2013, the Company had $63.5 million in deferred revenues related to the one-time cash payment, which it is recognizing over the life of the collaboration agreement with GlaxoSmithKline plc based on the units-of-revenue method. In addition, the Company continues to recognize royalty revenues equal to the amount of the third-party subroyalty and an offsetting royalty expense for the third-party subroyalty payment.

Q. Income Taxes

The components of income (loss) before provision for (benefit from) income taxes during the three years ended December 31, 2013 consisted of the following:

	2013			2012			2011
	(in thousands)
United States	$	(390,009	)	$	256,816		$	343,515
Foreign	(586,108		)	(269,197		)	(283,070		)
Income (loss) before provision for (benefit from) income taxes	$	(976,117	)	$	(12,381	)	$	60,445

F-34

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

The components of the provision for (benefit from) income taxes during the three years ended December 31, 2013 consisted of the following:

	2013			2012			2011
	(in thousands)
Current taxes:
United States	$	(11,420	)	$	2,057		$	22,275
Foreign	1,084			(1,865		)	(561		)
State	2,136			1,902			8,655
Total current taxes	$	(8,200	)	$	2,094		$	30,369
Deferred taxes:
United States	$	(131,281	)	$	31,308		$	19,629
Foreign	(127,587		)	—			(32,692		)
State	(21,499		)	5,352			1,960
Total deferred taxes	$	(280,367	)	$	36,660		$	(11,103	)
Provision for (benefit from) income taxes	$	(288,567	)	$	38,754		$	19,266

The difference between the Company’s “expected” tax provision (benefit), as computed by applying the U.S. federal corporate tax rate of 35% to income (loss) before provision for (benefit from) income taxes, and actual tax is reconciled as follows:

	2013			2012			2011
	(in thousands)
Income (loss) before provision for (benefit from) income taxes	$	(976,117	)	$	(12,381	)	$	60,445
Expected tax provision (benefit)	(341,641		)	(4,333		)	21,156
State taxes, net of federal benefit	(19,268		)	7,075			10,624
Foreign rate differential	72,961			62,425			43,629
Tax credits	(16,775		)	(1,980		)	(51,086		)
Unbenefited operating losses	(43,570		)	(30,364		)	(6,286		)
Non-deductible expenses	9,614			3,198			1,953
Rate change	50,076			3,275			—
Other	36			(542		)	(724		)
Provision for (benefit from) income taxes	$	(288,567	)	$	38,754		$	19,266

F-35

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

Deferred tax assets and liabilities are determined based on the difference between financial statement and tax bases using enacted tax rates in effect for the year in which the differences are expected to reverse. The components of the deferred taxes were as follows:

	As of December 31,
	2013			2012
	(in thousands)
Deferred tax assets:
Net operating loss	$	850,946		$	777,687
Tax credit carryforwards	180,380			147,074
Property and equipment	—			10,701
Intangible assets	26,105			63,353
Deferred revenues	25,158			44,867
Stock-based compensation	63,521			83,979
Inventories	26,278			56,564
Accrued expenses	52,470			27,945
Currency translation adjustment	217			—
Construction financing lease obligation	152,688			—
Gross deferred tax assets	1,377,763			1,212,170
Valuation allowance	(1,243,664		)	(1,211,561		)
Total deferred tax assets	134,099			609
Deferred tax liabilities:
Property and equipment	(134,099		)	—
Unrealized gain	—			(376		)
Contingent milestone and royalty payment obligation	—			(50,904		)
Acquired intangibles	—			(229,696		)
Net deferred tax liabilities	$	—		$	(280,367	)

For federal income tax purposes, as of December 31, 2013, the Company has net operating loss carryforwards of approximately $2.7 billion and tax credits of $120.1 million, which may be used to offset future federal income and tax liability, respectively. Approximately $694.8 million of the federal net operating loss carryforward will result in an increase to additional paid-in capital if and when these carryforwards are used to reduce income taxes payable.

For state income tax purposes, the Company has net operating loss carryforwards of approximately $966.8 million and tax credits of $66.9 million, which may be used to offset future state income and tax liability, respectively. Approximately $204.5 million of the state net operating loss carryforward will result in an increase to additional paid-in capital if and when these carryforwards are used to reduce state income taxes payable.

These federal and state operating loss carryforwards and tax credits expire at various dates through 2033. After consideration of all the evidence, both positive and negative, the Company continues to maintain a valuation allowance for the full amount of the 2013 deferred tax asset because it is more likely than not that the deferred tax asset will not be realized. In future periods, if management determines that it is more likely than not that the deferred tax asset will be realized, (i) the valuation allowance would be decreased, (ii) a portion or all of the deferred tax asset would be reflected on the Company’s consolidated balance sheet and (iii) the Company would record non-cash benefits in its consolidated statements of operations related to the reflection of the deferred tax asset on its consolidated balance sheets.

The valuation allowance increased by $32.1 million from December 31, 2012 to December 31, 2013 primarily due to an increase in net operating losses and credits.

F-36

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

Unrecognized tax benefits during the two years ended December 31, 2013 consisted of the following:

	2013			2012
	(in thousands)
Unrecognized tax benefits beginning of year	$	4,106		$	4,360
Gross change for current year positions	1,325			598
Increase for prior period positions	—			—
Decrease for prior period positions	(290		)	—
Decrease due to settlements and payments	—			—
Decrease due to statute limitations	(185		)	(852		)
Deconsolidation of Alios	(2,932		)	—
Unrecognized tax benefits end of year	$	2,024		$	4,106

The Company had gross unrecognized tax benefits of $2.0 million and $4.1 million, respectively, as of December 31, 2013 and 2012. At December 31, 2013, $2.0 million represented the amount of unrecognized tax benefits that, if recognized, would result in a reduction of the Company’s effective tax rate. The Company recognizes interest and penalties related to income taxes as a component of income tax expense. As of December 31, 2013, no interest and penalties have been accrued. In 2014, it is reasonably possible that the Company will reduce the balance of its unrecognized tax benefits by approximately $0.5 million due to the application of statute of limitations and settlements with taxing authorities, all of which would reduce the Company’s effective tax rate.

The Company files United States federal income tax returns and income tax returns in various state, local and foreign jurisdictions. The Company is no longer subject to any tax assessment from an income tax examination in the United States before 2008 or any other major taxing jurisdiction for years before 2006, except where the Company has net operating losses or tax credit carryforwards that originate before 2006. The Company is currently under examination by Revenue Quebec and the Canada Revenue Agency for the year ended December 31, 2011. No adjustments have been reported. The Company is not under examination by any other jurisdictions for any tax year.

At December 31, 2013, foreign earnings, which were not significant, have been retained indefinitely by foreign subsidiary companies for reinvestment; therefore, no provision has been made for income taxes that would be payable upon the distribution of such earnings, and it would not be practicable to determine the amount of the related unrecognized deferred income tax liability. Upon repatriation of those earnings, in the form of dividends or otherwise, the Company would be subject to U.S. federal income taxes (subject to an adjustment for foreign tax credits) and withholding taxes payable to the various foreign countries.

R. Restructuring Expenses

2003 Restructuring

In June 2003, Vertex adopted a plan to restructure its operations to coincide with its increasing internal emphasis on advancing drug candidates through clinical development to commercialization. The restructuring was designed to re-balance the Company’s relative investments in research and development to better support the Company’s long-term strategy. At that time, the restructuring plan included a workforce reduction, write-offs of certain assets and a decision not to occupy approximately 290,000 square feet of specialized laboratory and office space in Cambridge, Massachusetts under lease to Vertex (the “Kendall Square Lease”). The Kendall Square Lease commenced in January 2003 and has a 15-year term. In the second quarter of 2005, the Company revised its assessment of its real estate requirements and decided to use approximately 120,000 square feet of the facility subject to the Kendall Square Lease (the “Kendall Square Facility”) for its operations, beginning in 2006. The remaining rentable square footage of the Kendall Square Facility currently is subleased to third parties.

The Company’s initial estimate of its liability for net ongoing costs associated with the Kendall Square Lease obligation was recorded in the second quarter of 2003 at fair value. The restructuring expense incurred from the second quarter of 2003 through the end of the first quarter of 2005 (i.e., immediately prior to the Company’s decision to use a portion of the Kendall

F-37

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

Square Facility for its operations) relates to the estimated incremental net ongoing lease obligations associated with the entire Kendall Square Facility, together with imputed interest costs relating to the restructuring liability. The restructuring expense incurred in the period beginning in the second quarter of 2005 relates only to the portion of the Kendall Square Facility that the Company was not occupying and did not intend to occupy for its operations. The remaining lease obligations, which are associated with the portion of the Kendall Square Facility that the Company occupies and uses for its operations, are recorded as rental expense in the period incurred. In 2014, the Company expects to cease using this portion of the Kendall Square Facility for its operations, and to incur related cease use charges. The Company reviews its assumptions and estimates quarterly and updates its estimates of this liability as changes in circumstances require. The expense and liability recorded is calculated using probability-weighted discounted cash-flows of the Company’s estimated ongoing lease obligations, including contractual rental and build-out commitments, net of estimated sublease rentals, offset by related sublease costs.

In estimating the expense and liability under its Kendall Square Lease obligation, the Company estimated (i) the costs to be incurred to satisfy rental and build-out commitments under the lease (including operating costs), (ii) the lead-time necessary to sublease the space, (iii) the projected sublease rental rates, and (iv) the anticipated durations of subleases. The Company uses a credit-adjusted risk-free rate of approximately 10% to discount the estimated cash flows. The Company reviews its estimates and assumptions on at least a quarterly basis, intends to continue such reviews until the termination of the Kendall Square Lease, and will make whatever modifications the Company believes necessary, based on the Company’s best judgment, to reflect any changed circumstances. The Company’s estimates have changed in the past, and may change in the future, resulting in additional adjustments to the estimate of the liability. Changes to the Company’s estimate of the liability are recorded as additional restructuring expenses (credits). In addition, because the Company’s estimate of the liability includes the application of a discount rate to reflect the time-value of money, the Company records imputed interest costs related to the liability each quarter. These costs are included in restructuring expenses on the Company’s consolidated statements of operations.

The activity related to restructuring and other liability for 2003 was as follows:

	Restructuring Expense		Cash Payments			Non-cash Expense			Liability as of December 31, 2003
	(in thousands)
Lease restructuring and other operating lease expense	$	84,726	$	(15,200	)	$	—		$	69,526
Employee severance, benefits and related costs	2,616		(2,616		)	—			—
Leasehold improvements and asset impairments	4,482		—			(4,482		)	—
Total	$	91,824	$	(17,816	)	$	(4,482	)	$	69,526

In 2003, the lease restructuring and other operating lease expense included $78.7 million of lease restructuring expense and $6.0 million of lease operating expense incurred prior to the decision not to occupy the Kendall Square Facility. The restructuring accrual as of December 31, 2003 related only to the lease restructuring expense.

The activity related to 2003 restructuring for 2004 through 2013 was as follows:

	2013			2012			2011			2004-2013
	(in thousands)
Liability, beginning of the period	$	23,328		$	26,313		$	29,595		$	69,526
Cash payments	(15,255		)	(14,853		)	(14,904		)	(178,952		)
Cash received from subleases	10,670			10,024			9,548			75,708
Credit for portion of facility Vertex decided to occupy in 2005	—			—			—			(10,018		)
Restructuring expense	372			1,844			2,074			62,851
Liability, end of the period	$	19,115		$	23,328		$	26,313		$	19,115

In each period, the Company records lease restructuring expense attributable to imputed interest related to the restructuring liability. In certain periods, the restructuring expense also reflects the revision of certain key estimates and assumptions about building operating expenses and sublease income.

F-38

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

Fan Pier Move Restructuring

In connection with the relocation of its Massachusetts operations to Fan Pier in Boston, Massachusetts, the Company expects to incur restructuring charges related to its remaining lease obligations at its facilities in Cambridge, Massachusetts, including lease obligations related to the 120,000 square feet of the facility subject to the Kendall Square lease that the Company began using for its operations in 2006. The Company started incurring these charges in the fourth quarter of 2013 and expects them to continue through April 2018. Most of these restructuring charges will relate to cease use charges that will be incurred during the first half of 2014. The Company incurred $1.2 million of charges related to this restructuring during 2013. The continuing charges will relate to the difference between the Company’s estimated future cash flows related to its lease obligations and the actual cash flows that it incurs.

2013 Strategic Restructuring

In October 2013, the Company adopted a restructuring plan. The restructuring plan included (i) a workforce reduction primarily related to the commercial support of INCIVEK following the continued and rapid decline in the number of patients being treated with INCIVEK as new medicines for the treatment of HCV infection neared approval and (ii) the write-off of certain assets. This action resulted from the Company's decision to focus its investment on future opportunities in cystic fibrosis and other research and development programs.

The restructuring charges recorded during 2013 for each major type of cost associated with this restructuring plan were as follows:

	Restructuring Expense		Cash Payments			Non-cash Expense			Liability as of December 31, 2013
	(in thousands)
Employee severance, benefits and related costs	$	25,060	$	(21,458	)	$	(1,312	)	$	2,290
Asset impairments	6,282		—			(6,282		)	—
Contract termination and other associated costs	7,609		(1,458		)	—			6,151
Total	$	38,951	$	(22,916	)	$	(7,594	)	$	8,441

The Company estimates that it will incur aggregate restructuring charges of approximately $2.0 million to $2.5 million in 2014 and 2015 related to this restructuring plan. The Company anticipates cash payments of $7.9 million and $0.5 million will be made in 2014 and 2015, respectively, related to the restructuring liability as of December 31, 2013.

S. Employee Benefits

The Company has a 401(k) retirement plan (the “Vertex 401(k) Plan”) in which substantially all of its permanent U.S. employees are eligible to participate. Participants may contribute up to 60% of their annual compensation to the Vertex 401(k) Plan, subject to statutory limitations. The Company may declare discretionary matching contributions to the Vertex 401(k) Plan. Employees have the ability to transfer funds from the stock fund invested in Vertex common stock, subject to certain restrictions. As of December 31, 2013, 755,000 shares of common stock remained available for grant under the Vertex 401(k) Plan. Through mid-2013, the Company paid matching contributions in Vertex common stock in the form of fully-vested interests in a Vertex common stock fund. Beginning in mid-2013, the Company began paying matching contributions in the form of cash.

The Company declared matching contributions paid in fully-vested interests in the Vertex common stock fund to the Vertex 401(k) Plan as follows:

	2013		2012		2011
	(in thousands)
Discretionary matching contributions during the year ended December 31,	$	5,930	$	10,261	$	8,619
Shares issued during the year ended December 31,	99		242		183
Shares issuable as of the year ended December 31,	0		53		62

F-39

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

In 2013, the Company declared matching contributions paid in fully-vested interests in the Vertex common stock fund of $5.9 million, paid matching contributions in the form of cash of $5.0 million and accrued $2.4 million related to matching contributions for the fourth quarter of 2013, which will be paid in the first quarter of 2014.

T. Commitments

The Company moved into its new corporate headquarters in January 2014. Please refer to Note I, "Fan Pier Leases," for additional information regarding this commitment. The leases for the Company’s former headquarters expire in December 2015.

The term of the Kendall Square Lease began in January 2003. The Company occupies and uses for its operations approximately 120,000 square feet of the Kendall Square Facility and plans to cease using for its operations this portion of the Kendall Square Facility in 2014. The Company has sublease arrangements in place for the remaining rentable square footage of the Kendall Square Facility, with terms that expire in April 2015 and August 2015. The Kendall Square Lease will expire in 2018. Please refer to Note R, "Restructuring Expenses," for further information.

As of December 31, 2013, future minimum commitments under the Fan Pier Leases, facility operating leases with terms of more than one year and contractual sublease income under the Company’s subleases for the Kendall Square Facility were as follows:

Year	Fan Pier Leases		Kendall Square Lease		Kendall Sublease Income			Other Operating Leases		Total Lease Commitments (Net of Sublease Income)
	(in thousands)
2014	$	67,206	$	19,879	$	(8,546	)	$	40,762	$	119,301
2015	67,206		19,879		(3,996		)	33,398		116,487
2016	67,206		19,879		—			14,434		101,519
2017	67,206		19,879		—			12,995		100,080
2018	67,206		6,626		—			12,841		86,673
Thereafter	752,798		—		—			75,344		828,142
Total minimum lease payments	$	1,088,828	$	86,142	$	(12,542	)	$	189,774	$	1,352,202

During 2013, 2012 and 2011, rental expense was $57.7 million, $57.1 million and $49.4 million, respectively.

The Company has outstanding capital leases for equipment, leasehold improvements and software licenses with terms through 2019. The leases were accounted for as capital leases.  The capital leases bear interest at rates ranging from 2% to 7% per year. The following table sets forth the Company’s future minimum payments due under capital leases as of December 31, 2013:

Year	(in thousands)
2014	$	19,957
2015	18,346
2016	11,809
2017	10,714
2018	10,612
Thereafter	2,121
Total payments	73,559
Less: amount representing interest	(7,912		)
Present value of payments	$	65,647

F-40

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

In addition, the Company has committed to make potential future milestone and royalty payments pursuant to certain collaboration agreements. Payments generally become due and payable upon the achievement of certain developmental, regulatory and/or commercial milestones. Please refer to Note B, "Collaborative Arrangements," for further information.

In the second quarter of 2013, the Company began supporting $31.9 million in irrevocable stand-by letters of credit issued in support of property leases and other similar agreements with an unsecured credit facility with a one-year term. The Company previously had cash-collateralized these stand-by letters of credit. As a result of this credit facility, the restricted cash reflected on the Company's consolidated balance sheets decreased by $31.8 million net of other activity during 2013, and the Company's cash and cash equivalents increased by a corresponding amount during 2013.

U. Legal Proceedings

On September 6, 2012, a purported shareholder class action, City of Bristol Pension Fund v. Vertex Pharmaceuticals Incorporated, et al., was filed in the United States District Court for the District of Massachusetts, naming the Company and certain of the Company's current and former officers and directors as defendants. The lawsuit alleges that the Company made material misrepresentations and/or omissions of material fact in the Company's disclosures during the period from May 7, 2012 through June 28, 2012, all in violation of Section 10(b) of the Securities Exchange Act of 1934, as amended, and Rule 10b-5 promulgated thereunder. By order dated December 12, 2012, the court appointed the City of Bristol lead plaintiff and appointed the City of Bristol's attorneys lead counsel. The plaintiffs filed an amended complaint on February 11, 2013. The Company filed a motion to dismiss the complaint on April 12, 2013. On May 28, 2013, the plaintiffs filed an opposition to the Company's motion to dismiss the complaint. On June 27, 2013, the Company filed a reply in further support of the Company's motion to dismiss the plaintiffs' complaint. The court conducted a hearing on the Company's motion to dismiss on November 25, 2013. The plaintiffs seek unspecified monetary damages on behalf of the putative class and an award of costs and expenses, including attorney's fees, as well as disgorgement of the proceeds from certain individual defendants' sales of the Company's common stock. The Company believes that this action is without merit and intends to defend it vigorously. As of December 31, 2013, the Company has not recorded any reserves for this purported class action.

V. Contingencies

The Company has certain contingent liabilities that arise in the ordinary course of its business activities. The Company accrues a reserve for contingent liabilities when it is probable that future expenditures will be made and such expenditures can be reasonably estimated. There were no material contingent liabilities accrued as of December 31, 2013 or 2012.

W. Guarantees

As permitted under Massachusetts law, the Company’s Articles of Organization and By-laws provide that the Company will indemnify certain of its officers and directors for certain claims asserted against them in connection with their service as an officer or director. The maximum potential amount of future payments that the Company could be required to make under these indemnification provisions is unlimited. However, the Company has purchased directors’ and officers’ liability insurance policies that could reduce its monetary exposure and enable it to recover a portion of any future amounts paid. No indemnification claims currently are outstanding, and the Company believes the estimated fair value of these indemnification arrangements is minimal.

The Company customarily agrees in the ordinary course of its business to indemnification provisions in agreements with clinical trial investigators and sites in its drug development programs, sponsored research agreements with academic and not-for-profit institutions, various comparable agreements involving parties performing services for the Company, and its real estate leases. The Company also customarily agrees to certain indemnification provisions in its drug discovery, development and commercialization collaboration agreements. With respect to the Company’s clinical trials and sponsored research agreements, these indemnification provisions typically apply to any claim asserted against the investigator or the investigator’s institution relating to personal injury or property damage, violations of law or certain breaches of the Company’s contractual obligations arising out of the research or clinical testing of the Company’s compounds or drug candidates. With respect to lease agreements, the indemnification provisions typically apply to claims asserted against the landlord relating to personal injury or property damage caused by the Company, to violations of law by the Company or to certain breaches of the Company’s contractual obligations. The indemnification provisions appearing in the Company’s collaboration agreements are similar to those for the other agreements discussed above, but in addition provide some limited

F-41

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

indemnification for its collaborator in the event of third-party claims alleging infringement of intellectual property rights. In each of the cases above, the indemnification obligation generally survives the termination of the agreement for some extended period, although the Company believes the obligation typically has the most relevance during the contract term and for a short period of time thereafter. The maximum potential amount of future payments that the Company could be required to make under these provisions is generally unlimited. The Company has purchased insurance policies covering personal injury, property damage and general liability that reduce its exposure for indemnification and would enable it in many cases to recover all or a portion of any future amounts paid. The Company has never paid any material amounts to defend lawsuits or settle claims related to these indemnification provisions. Accordingly, the Company believes the estimated fair value of these indemnification arrangements is minimal.

X. Segment Information

The Company operates in one segment, pharmaceuticals. Enterprise-wide disclosures about revenues, significant customers, and property and equipment, net by location are presented below.

Revenues by Product

Product revenues, net consisted of the following:

	2013		2012		2011
	(in thousands)
INCIVEK	$	466,360	$	1,161,813	$	950,889
KALYDECO	371,285		171,645		—
Total product revenues, net	$	837,645	$	1,333,458	$	950,889

Revenues by Geographic Location

Total revenues from external customers and collaborators by geographic region consisted of the following. Product revenues are attributed to countries based on the location of the customer. Collaborative revenues are attributed to the operations of the Company in the United States. Royalty revenues are attributed to countries based on the location of the collaborator.

	2013		2012		2011
	(in thousands)
United States	$	896,952	$	1,373,516	$	1,389,568
Outside of the United States
Europe	279,557		129,786		20,289
Other	35,466		23,740		769
Total revenues outside of the United States	315,023		153,526		21,058
Total revenues	$	1,211,975	$	1,527,042	$	1,410,626

Significant Customers

Gross revenues and accounts receivable from each of the Company’s customers who individually accounted for 10% or more of total gross revenues and/or 10% or more of total gross accounts receivable consisted of the following:

F-42

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

	Percent of Total Gross Revenues						Percent of Gross Accounts Receivable
	Year Ended December 31,						As of December 31,
	2013		2012		2011		2013		2012
Janssen	22	%	<10	%	19	%	28	%	26	%
AmerisourceBergen Drug Corporation	21	%	32	%	25	%	<10	%	22	%
McKesson Corporation	21	%	29	%	24	%	<10	%	26	%
Cardinal Health Incorporated	<10	%	15	%	15	%	<10	%	<10	%
Bupa Home Healthcare Limited	<10	%	N/A		N/A		14	%	N/A

Property and Equipment, Net by Location

Property and equipment, net by location consisted of the following:

	As of December 31,
	2013		2012
	(in thousands)
United States	$	657,587	$	400,102
Outside of the United States
United Kingdom	29,970		30,622
Other	9,354		2,885
Total property and equipment, net outside of the United States	39,324		33,507
Total property and equipment, net	$	696,911	$	433,609

F-43

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

Y. Quarterly Financial Data (unaudited)

	Three Months Ended
	March 31, 2013			June 30, 2013			September 30, 2013			December 31, 2013
	(in thousands, except per share amounts)
Revenues:
Product revenues, net	$	267,381		$	254,789		$	186,653		$	128,822
Royalty revenues	43,573			49,120			27,012			36,887
Collaborative revenues (1)	17,414			6,841			8,035			185,448
Total revenues	328,368			310,750			221,700			351,157
Costs and expenses:
Cost of product revenues (2)	30,955			24,695			20,048			13,281
Royalty expenses	11,788			13,236			7,291			8,983
Research and development expenses	218,095			222,455			228,624			249,609
Sales, general and administrative expenses	92,879			106,521			87,754			75,188
Restructuring expenses	39			776			12,048			27,658
Intangible asset impairment charges (3)(4)	412,900			—			—			250,600
Total costs and expenses	766,656			367,683			355,765			625,319
Loss from operations	(438,288		)	(56,933		)	(134,065		)	(274,162		)
Interest expense, net	(3,465		)	(6,551		)	(95		)	(12,619		)
Other income (expense), net (4)	(1,187		)	(27		)	4,747			(53,472		)
Loss before benefit from income taxes	(442,940		)	(63,511		)	(129,413		)	(340,253		)
Benefit from income taxes (3)(4)	(130,313		)	(1,799		)	(751		)	(155,704		)
Net loss	(312,627		)	(61,712		)	(128,662		)	(184,549		)
Net loss attributable to noncontrolling interest (Alios)	4,611			4,547			4,530			228,834
Net income (loss) attributable to Vertex	$	(308,016	)	$	(57,165	)	$	(124,132	)	$	44,285
Net income (loss) per share attributable to Vertex common shareholders:
Basic	$	(1.43	)	$	(0.26	)	$	(0.54	)	$	0.19
Diluted	$	(1.43	)	$	(0.26	)	$	(0.54	)	$	0.19
Shares used in per share calculations:
Basic	215,421			222,053			230,505			231,264
Diluted	215,421			222,053			230,505			235,717

F-44

VERTEX PHARMACEUTICALS INCORPORATED

Notes to Consolidated Financial Statements (Continued)

	Three Months Ended
	March 31, 2012			June 30, 2012			September 30, 2012			December 31, 2012
	(in thousands, except per share amounts)
Revenues:
Product revenues, net	$	375,375		$	373,273		$	303,501		$	281,309
Royalty revenues	38,981			33,480			25,586			43,451
Collaborative revenues	24,381			11,552			6,919			9,234
Total revenues	438,737			418,305			336,006			333,994
Costs and expenses:
Cost of product revenues (2)	25,918			104,549			30,680			75,595
Royalty expenses	13,293			9,874			7,856			12,120
Research and development expenses	196,371			196,544			200,161			213,109
Sales, general and administrative expenses	111,146			117,514			97,684			110,452
Restructuring expenses	360			594			696			194
Intangible asset impairment charge	—			—			—			—
Total costs and expenses	347,088			429,075			337,077			411,470
Income (loss) from operations	91,649			(10,770		)	(1,071		)	(77,476		)
Interest expense, net	(3,891		)	(3,814		)	(4,054		)	(3,263		)
Other income (expense), net	150			179			13			(33		)
Income (loss) before provision for (benefit from) income taxes	87,908			(14,405		)	(5,112		)	(80,772		)
Provision for (benefit from) income taxes	32			20,063			21,355			(2,696		)
Net income (loss)	87,876			(34,468		)	(26,467		)	(78,076		)
Net loss (income) attributable to noncontrolling interest (Alios)	3,714			(30,463		)	(31,076		)	1,928
Net income (loss) attributable to Vertex	$	91,590		$	(64,931	)	$	(57,543	)	$	(76,148	)
Net income (loss) per share attributable to Vertex common shareholders:
Basic	$	0.44		$	(0.31	)	$	(0.27	)	$	(0.35	)
Diluted	$	0.43		$	(0.31	)	$	(0.27	)	$	(0.35	)
Shares used in per share calculations:
Basic	208,018			211,344			213,767			214,607
Diluted	219,264			211,344			213,767			214,607

1. During the fourth quarter of 2013, the Company recorded $182.4 million of collaborative revenue related to its Janssen collaboration, which was primarily attributable to an amendment to its collaboration agreement with Janssen. See Note B, "Collaborative Arrangements," for further information.

2. During 2013 and 2012, the Company recorded within cost of product revenues lower-of-cost or market charges for excess or obsolete inventories. See Note G, "Inventories," for further information.

3. During the first quarter of 2013, the Company recorded a $412.9 million intangible asset impairment charge related to its VX-222 indefinite-lived in-process research and development asset. In connection with this impairment charge, the Company recorded a credit of $127.6 million in its provision for income taxes. See Note J, "Intangible Assets and Goodwill," for further information.

4. During the fourth quarter of 2013, the Company deconsolidated Alios, which included certain charges related to deconsolidation recorded in other income (expense), net, and was preceded by a $250.6 million intangible asset impairment charge related to the HCV nucleotide analogue program indefinite-lived in-process research and development asset. In connection with this impairment charge, a credit of $102.1 million was recorded to the provision for income taxes attributable to Alios. See Note B, "Collaborative Arrangements," and Note J, "Intangible Assets and Goodwill," for further information.

F-45

EX-10.2

Exhibit 10.2

Execution Version

Confidential Treatment Requested. Confidential portions of this document have been redacted

and have been separately filed with the Commission.

2013 Amendment

to

License, Development, Manufacturing and Commercialization Agreement

by and between

Vertex Pharmaceuticals Incorporated

and

Janssen Pharmaceutica NV

Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

TABLE OF CONTENTS

Article 1	Definitions	1
Article 2	Governance	2
2.1	Termination of Governance Provisions	2
2.2	Liaisons	2
2.3	Diligent Efforts	2
2.4	Safety	2
Article 3	Development	2
3.1	Termination of Development Provisions	2
3.2	Post-Collaboration Development Activities	2
3.3	Regulatory Submissions and Regulatory Approvals	2
3.4	Pediatric Study	3
3.5	Extend Study	3
3.6	Specific Studies	3
3.7	Wind Down	3
Article 4	Manufacture and Supply	3
4.1	Termination of Manufacture and Supply Provisions	3
4.2	Clinical and Commercial Supplies	3
4.3	Supply and Quality Agreement	4
Article 5	Commercialization	4
5.1	Termination of Commercialization Rights	4
5.2	Resource Allocation	4
5.3	Referral of Orders; Returns	4
5.4	Pharmacovigilance, Adverse Event and Product Complaint Reporting Procedures	4
5.5	Medical Enquiries	4
5.6	Website Cooperation Agreement	4
5.7	Advertising and Promotional Materials	5
5.8	Continuing Commercial Provisions	5
Article 6	Philanthropic Program	5
6.1	Philanthropic Program	5
Article 7	License Grant	5
7.1	License Grants	5
7.2	Additional Non-Exclusive Know-How License from Vertex	5
7.3	Additional Licenses from Janssen	5
7.4	Additional Development License from Vertex	5
7.5	Paid-Up License	5
7.6	Right to Sublicense	5
7.7	Other License Amendments	5
Article 8	Intentionally Left Blank	6

i

Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

Article 9	Financial Provisions	6
9.1	One-time License Fee	6
9.2	Royalties Milestones and Other Payments	6
9.3	Cost Reimbursement	6
9.4	Third Party Licenses	6
9.5	Reports	6
9.6	Audits, Payments and Income Tax Withholdings	7
9.7	Parallel Importation	7
Article 10	Intellectual Property	7
10.1	General	7
10.2	Assignment	7
10.3	Reimbursement	7
10.4	ELC Patents	7
Article 11	Confidentiality	7
11.1	Confidentiality and Non-Use	7
11.2	Consultant and Advisor Obligations	8
11.3	Publication	8
11.4	Publicity/Use of Names	8
Article 12	Representations and Warranties; Indemnification	8
12.1	Authority	8
12.2	General	9
Article 13	Term	9
13.1	Term	9
13.2	Survival	9
Article 14	Governing Law and Dispute Resolution	9
14.1	Governing Law and Dispute Resolution	9
14.2	Amendment of Dispute Resolution Provisions	9
Article 15	Miscellaneous	9
15.1	Miscellaneous	9
Article 16	Mutual Releases	9
16.1	Release of Janssen	9
16.2	Release of Vertex	10
16.3	Non-Assignment of Claims	10
16.4	Later Discovered Facts	10
16.5	Voluntary Execution	10

ii

Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

2013 Amendment to License, Development, Manufacturing and Commercialization Agreement

This 2013 Amendment to the License, Development, Manufacturing and Commercialization Agreement (this “2013 Amendment”) is effective as of November 19, 2013 (the “Amendment Effective Date”) and is entered into by and between Vertex Pharmaceuticals Incorporated, a Massachusetts corporation with corporate offices at 130 Waverly Street, Cambridge, MA 02139-4242, United States of America (“Vertex”) and Janssen Pharmaceutica NV, a Belgium corporation with corporate offices at 30, Turnhoutsesteenweg, B-2340 Beerse, Belgium (“Janssen”).

Background

WHEREAS, Vertex and Janssen have entered into a License, Development, Manufacturing and Commercialization Agreement effective June 30, 2006, as amended to date (the “Parent Agreement”) and the Website Cooperation Agreement dated January 4, 2011; and

WHEREAS, Vertex and Janssen have developed telaprevir and Janssen has commercialized Incivo (telaprevir) in the Territory under the terms of the Parent Agreement, and

WHEREAS, Vertex and Janssen each now wish to further amend the rights and obligations of the Parties under the Parent Agreement and the Website Cooperation Agreement.

NOW, THEREFORE, in consideration of the foregoing premises and the mutual covenants herein contained, the receipt and sufficiency of which are hereby acknowledged, the Parties agree as follows.

Article 1 - Definitions

Capitalized terms used in this 2013 Amendment that are not defined herein will have the meaning assigned to such terms in the Parent Agreement.

1.1 “Agreement” means the Parent Agreement as amended by this 2013 Amendment.

1.2 “ELC Patents” means a Janssen Assigned Patent, which has the family designation VPI/00-131 as listed on Schedule A.

1.3 “Extend Study” means the ongoing Clinical Trial entitled “A 3-Year, Virology Follow-up Study in Subjects Previously Treated With Telaprevir in Select Clinical Studies.”

1.4 “Janssen Assigned Patents” means the Patent Rights assigned to Janssen by Vertex as defined in Section 10.2 of this 2013 Amendment.

1.5 “Liaisons” means the persons designated by the Parties pursuant to Section 2.2 of this 2013 Amendment and “Liaison” means any one of them.

1.6 “Pediatric Study” means the ongoing Clinical Trial entitled “An Open-Label Study of the Effect of Telaprevir in Combination With Peginterferon Alfa-2b and Ribavirin in Pediatric Subjects Infected With Hepatitis C Virus.”

1.7 “Post-Collaboration Development Activities” mean any Development activities of a Party that are initiated after the Amendment Effective Date and that relate to the Development of a Product containing VX-950.

1.8 “Specific Studies” means the following Clinical Trials entitled:

1.8.1    “A 2-Part, Open Label Study of Telaprevir in Combination With Peginterferon Alfa-2a (Pegasys®) and Ribavirin (Copegus®) in Subjects Chronically Infected With Genotype 1 Hepatitis C Virus Following Liver Transplantation;” (the Refresh study 117)

1

Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

1.8.2    “An Open-Label, Phase 3b Study To Determine Efficacy and Safety of Telaprevir, Pegylated-Interferon-alfa-2a and Ribavirin in Hepatitis C Genotype 1 Infected, Stable Liver Transplant Subjects;” (the study HPC3006)

1.8.3    “An Open-Label, Phase 3b Study to Determine Efficacy and Safety of Telaprevir, Pegylated-Interferon-alfa-2a and Ribavirin in Hepatitis C Virus Treatment-Naïve and Treatment-Experienced Subjects With Genotype 1 Chronic Hepatitis C and Human Immunodeficiency Virus Type 1 (HCV-1/HIV-1) Coinfection;” (the study HPC3008) and

1.8.4    “An Open Label, Phase 3 Study of Telaprevir in Combination With Peginterferon Alfa 2a (Pegasys®) and Ribavirin (Copegus®) in Subjects Coinfected With Genotype 1 Hepatitis C Virus and Human Immunodeficiency Virus Type 1(HCV/HIV-1).” (the Unite study 115)

Article 2 - Governance

2.1 Termination of Governance Provisions. Article 2 of the Parent Agreement shall terminate in its entirety as of the Amendment Effective Date.

2.2 Liaisons. Promptly after the Amendment Effective Date, the Parties will designate Liaisons to receive communications and to communicate regarding (a) the conduct of Clinical Trials by a Party during the Term in which Product containing VX-950 is administered, including for the Pediatric Study, and (b) the Agreement. Any reference in the Agreement to the JSC or any other governance committee will be a reference to the Liaison of a Party as appropriate.

2.3 Diligent Efforts. For clarity, except as specifically provided herein, all obligations of the Parties to use diligent efforts under the Agreement are terminated.

2.4 Safety. For clarity,the governance provisions of the Pharmacovigilance Agreement, dated August 28, 2012, by and among the Parties and Mitsubishi Tanabe Pharma Corporation (the “Pharmacovigilance Agreement”), including provisions relating to the DST and SOWG (as defined in the Pharmacovigilance Agreement), are not affected by this 2013 Amendment.

Article 3 - Development

3.1 Termination of Development Provisions. Sections 3.1, 3.2, 3.3, 3.4, 3.5.1, 3.6, 3.7.2 and 3.7.5 of the Parent Agreement shall terminate in their entirety as of the Amendment Effective Date.

3.2 Post-Collaboration Development Activities. Section 3.5 of the Parent Agreement (excluding all governance provisions contained therein) shall continue to be applicable to Additional Development Activities initiated by a Party prior to the Amendment Effective Date, and the following shall be inserted after the final paragraph of Section 3.5:

“Each Party shall have the right to conduct Post-Collaboration Development Activities at such Party’s sole expense. A Party may include results from any Post-Collaboration Development Activities conducted by the other Party with a Regulatory Authority to the extent that filing such results is required for safety purposes by the Regulatory Authority. A Party who wishes to include the results from the other Party’s Post-Collaboration Development Activities in Regulatory Filings for other than required safety reasons shall have the right to do so to support a label claim or a change in an approved label in such Party’s territory [***].”

3.3 Regulatory Submissions and Regulatory Approvals. Sections 3.7.1, 3.7.3 and 3.7.4 of the Parent Agreement shall continue in full force and effect. Drafts of material submissions made by a Party to, or correspondence with, Regulatory Authorities in such Party’s territory regarding the Product will be provided to the other Party to the extent practicable a reasonable period prior to such submission.

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Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

3.4 Pediatric Study. The Parties agree to conduct the Pediatric Study as follows: (a) Vertex shall be responsible for using Diligent Efforts, including compliance with applicable law and Good Clinical Practice, to conduct the Pediatric Study as provided in the Global Development Plan as of the Amendment Effective Date, and (b) Vertex shall be reimbursed by Janssen for costs of the Pediatric Study as provided in Section 9.3 of the Parent Agreement as amended hereby. The Parties’ Liaisons shall review any proposed amendments to the Pediatric Study presented by either Party and may approve or disapprove any such proposed amendments; provided that such Pediatric Study shall be amended by the Parties to the extent required by any relevant Regulatory Authority. Disagreements regarding the Pediatric Study that cannot be resolved by the Liaisons shall be submitted for resolution as Unresolved Matters under the provisions of Section 14.2 of the Parent Agreement.

[***]

3.5 Extend Study. The Parties agree to conduct the Extend Study as follows: (a) the Parties shall be responsible for using Diligent Efforts, including compliance with applicable law and Good Clinical Practice, to conduct the Extend Study as provided in the Global Development Plan as of the Amendment Effective Date, and (b) each Party shall be reimbursed by the other Party for costs of the Extend Study as provided in Section 9.3 of the Parent Agreement as amended hereby. The Parties’ Liaisons shall review any proposed amendments to the Extend Study presented by either Party and may approve or disapprove any such proposed amendments; provided that such Extend Study shall be amended by the Parties to the extent required by any relevant Regulatory Authority. Disagreements regarding the Extend Study that cannot be resolved by the Liaisons shall be submitted for resolution as Unresolved Matters under the provisions of Section 14.2 of the Parent Agreement.

3.6 Specific Studies. Notwithstanding Section 3.5 of the Parent Agreement, the Parties have decided to share the results of the Specific Studies at no cost to the other Party. The Parties will make such disclosures to each other, execute such documents and provide such rights of reference to enable the other Party to submit to Regulatory Authorities such Janssen Know-How and Vertex Know-How generated as a result of these Specific Studies and to obtain the intended modifications to the Regulatory Approvals supported by such know-how. The Licenses of Sections 7.2 and 7.3 of the Parent Agreement will include a license to the Vertex Know-How and the Janssen Know-How resulting from any know-how generated as a result of and any Vertex Patent Rights or Janssen Patent Rights resulting from inventions conceived or reduced to practice as a result of the Specific Studies.

3.7 Wind-down. The Parties shall as promptly as practicable wind down all “other” activities, if any, contemplated by the Global Development Plan as of the Amendment Effective Date (“other” meaning other than the Pediatric Study, the conduct of which shall be governed by Section 3.4 of this 2013 Amendment, the Extend Study, the conduct of which shall be governed by Section 3.5 of this 2013 Amendment, and the Specific Studies).

Article 4 - Manufacture and Supply

4.1 Termination of Manufacture and Supply Provisions. Sections 4.1, 4.2, 4.3, 4.4, 4.5 and 4.7 of the Parent Agreement shall terminate in their entirety as of the Amendment Effective Date.

4.2 Clinical and Commercial Supplies. The Manufacture and supply of Product for both clinical and commercial purposes will occur in accordance with the terms of this 2013 Amendment as follows:

(a) Clinical. Each Party shall use its own supply of VX-950 for Clinical Trials conducted by or on behalf of such Party in accordance with the licenses granted in the Agreement.

(b) Commercial. Janssen will be responsible for the Manufacture of Product for Commercialization in the Territory, and Vertex will be responsible for the Manufacture of Product for Commercialization in its territories. If Janssen requests from Vertex any commercial quantities of VX-950, to the extent such commercial quantities are then available and will not adversely affect

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Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

Vertex’s Commercialization of Products containing VX-950 in its territories, Vertex will provide such quantities to Janssen [***] pursuant to the Supply Agreement dated July 9, 2009 (the “Supply Agreement”) between the Parties.

4.3 Supply Agreement and Quality Agreement.

4.3.1    Section 6.6 of the Supply Agreement is deleted in its entirety and the following is substituted therefor:

“Survival. Notwithstanding anything in this Supply Agreement to the contrary, the following provisions herein shall survive the termination of this Supply Agreement: last sentence of Section 2.2,Sections 3.1, 6.3, 6.6, 9.1, 9.2, 9.4-9.13, and Articles 7 and 8, and the provisions of the Quality Agreement which by their terms survive such termination.”

4.3.2    The Supply Agreement, as amended by Section 4.3.1 of this 2013 Amendment, is terminated as of the Amendment Effective Date.

4.3.3    The Quality Agreement dated June 23, 2009, as amended, is terminated as of the Amendment Effective Date.

Article 5 - Commercialization

5.1 Termination of Commercialization Provisions. Sections 5.1, 5.2, 5.3, 5.4, 5.5, 5.8 and 5.9 of the Parent Agreement shall terminate in their entirety as of the Amendment Effective Date.

5.2 Resource Allocation. Janssen will be permitted to allocate resources to the Commercialization of the Product according to its own internal decision making process. Janssen shall be solely responsible for all decisions regarding the prices charged for the Product in the Territory, as well as discounts, rebates and all other deductions from Net Sales allowed under Section 1.77 of the Parent Agreement.

5.3 Referral of Orders; Returns. Section 5.6 of the Parent Agreement shall remain in full force and effect; provided that if Product sold in the Territory is returned to Vertex, Vertex shall promptly ship such Product to a facility designated by Janssen, at Janssen’s expense.

5.4 Pharmacovigilance, Adverse Event and Product Complaint Reporting Procedures.

5.4.1    Agreement. The Pharmacovigilance Agreement shall continue to govern the rights and obligations of the Parties regarding pharmacovigilance, adverse events and product complaint reporting procedures and is not modified by this 2013 Amendment. Section 5.7 of the Parent Agreement shall remain in full force and effect (subject to the later executed Pharmacovigilance Agreement) except that [***].

5.4.2    Database. The Parties agree to use commercially reasonable efforts to allow Janssen to, by March 1, 2014, (1) cease processing VX-950 adverse events in Vertex’s Argus Global Safety Database and (2) begin exchanging adverse events electronically (E2B) with Vertex from Janssen’s Safety Database; provided that this transition will not occur until the electronic exchange (a) meets the requirements set forth in ICH E2B (R2) - Maintenance of the ICH Guideline on Clinical Safety Data Management: Data Elements For Transmission of Individual Case Safety Reports and (b) requires only similar Vertex personnel resources as are currently required.

5.5 Medical Inquiries. Section 5.11.1 of the Parent Agreement is hereby amended by deleting (a) [***] and (b) the last sentence of such Section 5.11.1 of the Parent Agreement.

5.6 Website Cooperation Agreement. The establishment, content, operation, and maintenance of any site or domain on the internet by the Parties for the Product is subject to the Website Cooperation Agreement dated January 4, 2011 except that Article 3 of the Website Cooperation Agreement shall terminate as of the Amendment Effective Date.

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Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

5.7 Advertising and Promotional Materials. Janssen will have the right, but not the obligation, to carry Vertex’s name and logo on its Product packaging, package inserts, labels and containers, and on all printed, electronic and digital material related thereto, including educational materials and advertisements, with no size requirement.

5.8 Continuing Commercial Provisions. Sections 5.7, 5.10 and 5.11.2 of the Parent Agreement shall remain in full force and effect.

Article 6 - Philanthropic Program.

6.1 Philanthropic Program. Article 6 of the Parent Agreement has been deleted in its entirety and the following is substituted therefor:

“Each Party shall have the right but no obligation to conduct philanthropic programs with respect to the diagnosis, prevention, treatment and cure of HCV infection. Each Party will be free to qualify a bona fide program for the diagnosis, prevention, treatment and cure of HCV infection as philanthropic.”

Article 7 - License Grants

7.1 License Grants. Article 7 of the Parent Agreement, as supplemented and modified by this 2013 Amendment, shall remain in full force and effect.

7.2 Additional Non-exclusive Know-How License from Vertex. Vertex and its Affiliates hereby grant to Janssen a non-exclusive, worldwide [***] license to use the Information disclosed by Vertex or its Affiliates under the Agreement to Janssen or its Affiliates for any purpose within Janssen and its Affiliates consistent with Janssen’s obligation of confidentiality with respect to Third Parties pursuant to the Agreement. The license contained in this Section 7.2 of this 2013 Amendment may be sublicensed in accordance with Section 7.7, first paragraph, of the Parent Agreement.

7.3 Additional Licenses from Janssen. Janssen hereby grants to Vertex a perpetual, [***], non-exclusive license in the Territory to Manufacture VX-950 and Products containing VX-950 for Commercial use outside the Territory under Janssen Assigned Patents. Janssen hereby grants to Vertex a perpetual, [***], non-exclusive license in the Territory under the Janssen Assigned Patents for all purposes other than Developing, Manufacturing and/or Commercializing VX-950 or its bioequivalents, and Products containing VX-950 or its bioequivalents. The licenses contained in this Section 7.3 of this 2013 Amendment may be sublicensed in accordance with Section 7.7, first paragraph, of the Parent Agreement.

7.4 Additional Development License from Vertex. Vertex and its Affiliates hereby grant to Janssen a non-exclusive right and license under the Vertex Know-How, Vertex Patent Rights and Vertex’s rights under Joint Patent Rights to Develop and Manufacture VX-950 and Products containing VX-950 in North America.

7.5 Paid-up Licenses. The licenses of Article 7 of the Parent Agreement and Article 7 of the 2013 Amendment shall be fully paid-up and perpetual subject to (i) the payment of royalties for Net Sales during the quarters ended September 29, 2013 and December29, 2013, (ii) [***] and (iii) amounts payable to Vertex [***] pursuant to Section 9.5 of the Agreement.

7.6 Right to Sublicense. The second paragraph of Section 7.7 of the Parent Agreement shall be deleted in its entirety. Each Party promptly shall provide written notice to the other Party of any sublicense granted pursuant to Section 7.7 of the Agreement, except in case of sublicenses to Affiliates.

7.7 Other License Amendments. The licenses of Sections 7.1, 7.2, 7.3 and 7.4 of the Parent Agreement are amended in the last sentence after the phrase “Additional Development Activities” to add the phrase “or Post Collaboration Development Activities.”

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Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

Article 8 - Intentionally Left Blank

Article 9 - Financial Provisions

Except as provided for in this 2013 Amendment, all obligations of Janssen and Vertex to pay royalties, license fees, milestones and/or development cost reimbursement under the Agreement (including Section 9.1 of the Parent Agreement) will terminate.

9.1 One-time License Fee. In consideration for royalties that would have otherwise been payable to Vertex related to Net Sales in the Territory on or after December 29, 2013 pursuant to Section 9.4.1(a) of the Parent Agreement and the covenants and the licenses under this 2013 Amendment, Janssen shall pay Vertex a one-time non-refundable, non-creditable payment of One Hundred Fifty Two Million Dollars (US $152,000,000) within [***] of the Amendment Effective Date.

9.2 Royalties Milestones and Other Payments.

(a) Section 9.2 of the Parent Agreement shall terminate in its entirety as of the Amendment Effective Date.

(b) Sections 9.4.1(a) and 9.4.2 of the Parent Agreement shall terminate effective upon the fulfillment of Janssen’s obligations to pay royalties on Net Sales in the Territory for the Calendar Quarter ended December 29, 2013.

(c) Section 9.4.1(b) of the Parent Agreement shall be terminated in its entirety immediately following the Calendar Quarter ending December 29, 2013 and the following substituted therefor:

“9.4.1 (b) [***]"

(d) If Net Sales of VX-950 in the Territory for the period beginning on [***] and ending on [***] exceed [***], Janssen shall make a one-time additional payment to Vertex of [***] within [***] of the completion of the Calendar Quarter in which such milestone is first achieved.

9.3 Cost Reimbursement. Section 9.3 of the Parent Agreement is hereby amended to provide that (a) [***] and (b) the right of each Party to inspect the books and records of the other Party pursuant to Section 9.3 shall only apply to Global Development Costs incurred on or after January 1, 2013 by the Party maintaining the books and records.

9.4 Third Party Licenses. The first sentence of Section 9.5 of the Parent Agreement shall be deleted in its entirety and replaced with the following:

“Janssen shall be responsible (except as provided in Section 9.4.1(b)) for one hundred percent (100%) of any royalties, or other amounts relating to intellectual property rights, payable to any Third Party on account of Products sold in the Territory by Janssen, its Affiliates or sublicensee (except for Vertex), and shall pay to Vertex, in accordance with the procedures that have been established by the Parties prior to this Amendment Effective Date for such payments: (a) [***] and (b) [***]. Vertex represents and warrants that: (i) the ELC Patents are [***] or [***] (both as defined in [***]) and (ii) the compounds claimed as a composition of matter by a Valid Claim of the ELC Patents are [***] (as defined in [***]). [***].”

9.5 Reports. Section 9.6 of the Parent Agreement shall terminate in its entirety effective immediately following the delivery of the [***] to be furnished to Vertex for the [***], and the following shall be substituted therefor:

“Janssen shall furnish to Vertex a [***], at the end of each [***], showing the Net Sales of Products in each country in the Territory during the reporting period, and any permitted deductions from gross sales taken to arrive at the Net Sales calculation. [***] Janssen shall keep complete and accurate records in sufficient detail to enable the information provided hereunder to be verified by

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Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

Vertex’s accounting firm pursuant to Section 9.7 of this Agreement in the case that under [***] or [***] a request is made by such counterparty to audit the Net Sales in the Territory or in order for Vertex to verify the written report on the Net Sales of Products in the Territory between [***] and [***].”

9.6 Audits, Payments and Income Tax Withholdings. Sections, 9.8, 9.9 and 9.10 of the Parent Agreement shall remain in full force and effect and apply to any payment obligation under the Agreement. Section 9.7 of the Parent Agreement will only apply to reporting (a) under the Parent Agreement between December 30, 2012 and December 29, 2013 or (b) under Section 9.5 of this 2013 Amendment for periods on or after December 30, 2012. For clarity, all audit rights under Section 9.7 will terminate as of March 1, 2015 except in the case of an audit request made under [***] or [***].

9.7 Parallel Importation. Section 9.11 of the Parent Agreement shall terminate in its entirety as of the Amendment Effective Date.

Article 10 - Intellectual Property

10.1 General. Article 10 of the Parent Agreement, as supplemented and modified by this 2013 Amendment, shall remain in full force and effect.

10.2 Assignment. Contemporaneously to the execution of this 2013 Amendment, Vertex shall execute the patent assignments attached as Schedule B. These patent assignments convey legal and equitable ownership to Janssen of the Vertex Patent Rights and the Vertex interest in Joint Patent Rights in the Territory that are listed as “Assigned” patents on Schedule A (the “Janssen Assigned Patents”). Janssen shall have all rights of ownership, including any right and responsibility of prosecution, maintenance and enforcement of the Janssen Assigned Patents at its sole expense, subject to the licenses granted pursuant Section 7.3 of this 2013 Amendment. The Janssen Assigned Patents will no longer be Vertex Patent Rights or Joint Patent Rights and will not be Janssen Patent Rights under the Agreement. Except as specifically provided for herein, Janssen shall have no obligations to Vertex as to and Vertex shall have no rights in the Janssen Assigned Patents. Vertex agrees to execute such documents and perform such acts as may be reasonably necessary to record or otherwise effectuate such assignments. Notwithstanding the foregoing, the Parties agree to coordinate regarding the prosecution and any other proceedings relating to the Janssen Assigned Patents.

10.3 Reimbursement. Janssen’s obligation to [***] as set forth in Section 10.1 of the Parent Agreement is terminated. Janssen’s obligation to [***] as set forth in Section 10.1 of the Parent Agreement is unchanged.

10.4 ELC Patents. Janssen shall give Vertex [***] advance notice of any decision to cease preparation, filing, prosecution or maintenance any patents or patent applications within the ELC Patents (each, a “Discontinued Patent”). Janssen acknowledges that [***] would have the right to elect to continue preparation, filing, prosecution and maintenance of such Discontinued Patents at [***] sole expense. Janssen agrees to assign ownership of such Discontinued Patents to [***] and to execute such documents and perform such acts as may be reasonably necessary for [***] to file or to continue its prosecution or maintenance of such Discontinued Patents. Notwithstanding the assignment of the ELC Patents in Section 10.2 of this 2013 Amendment, Janssen acknowledges and agrees that [***] retains a fully paid-up, non-exclusive, worldwide license without any right to sublicense, to the ELC Patents for [***] internal research purposes only.

Article 11 - Confidentiality

11.1 Confidentiality and Non-use. Section 11.1 of the Parent Agreement, as supplemented and modified by this 2013 Amendment, shall remain consistent with the licenses granted herein (including in Section 7.2 of this 2013 Amendment) in full force and effect.

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Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

11.2 Consultant and Advisor Obligations. Section 11.2 of the Parent Agreement is deleted in its entirety as of the Amendment Effect Date and the following is substituted therefor:

“Each Party agrees that it and its Affiliates shall provide or permit access to Information received from the other Party and such Party's Affiliates and representatives only to consultants, Permitted Sublicensees and subcontractors of the receiving Party, and to the consultants, Permitted Sublicensees and subcontractors of the receiving Party's Affiliates, who in such Party's reasonable judgment have a need to know such Information to assist the receiving Party with the activities contemplated by this Agreement and who are subject to obligations of confidentiality and non-use with respect to such Information no less restrictive than the obligations of confidentiality and non-use of the receiving Party pursuant to Section 11.1 of the Parent Agreement; provided that each Party shall remain responsible for any failure by its Affiliates, and its and its Affiliates' respective consultants, permitted subcontractors and sublicensees, to treat such Information as required under Section 11.1 of the Parent Agreement (as if such Affiliates, consultants, permitted subcontractors and sublicensees were Parties directly bound to the requirements of Section 11.1).”

11.3 Publication. Section 11.3 of the Parent Agreement is deleted in its entirety as of the Amendment Effective Date and the following is substituted therefor:

“Each of Janssen and Vertex reserves the right to publish or publicly present any results (the “Results”) related to the Product, subject to the following terms and conditions. The Party proposing to publish or publicly present the Results (the “Publishing Party”) will submit a draft of any proposed manuscript, abstract or speech to the other Party (the “Non-Publishing Party”) for comments [***] prior to submission for publication or oral presentation. The Non-Publishing Party shall notify the Publishing Party in writing [***] of receipt of such draft whether such draft contains (i) information of the Non-Publishing Party which it considers to be confidential under the provisions of Section 11.1 of the Agreement, or (ii) information that if published would have an adverse effect on a patent application covering the subject matter of this Agreement. In any such notification, the Non-Publishing Party shall indicate with specificity its suggestions regarding the manner and degree to which the Publishing Party may disclose such information. In the case of item (i) above, no Party may publish Information of the other Party without its consent in violation of Section 11.1 of this Agreement. In the case of item (ii) above, the Non-Publishing Party may request a delay and the Publishing Party shall delay such publication or presentation, for a period [***], to permit the timely preparation and filing of a patent application or an application for a certificate of invention covering the information at issue. The Parties agree that authorship of any publication or presentation will be determined based on the customary standards then being applied in the relevant scientific journal or conference. The forgoing provisions shall not be interpreted to prevent the publication by a Party of information required by law to be published by that Party.

This Section 11.3 shall terminate with the termination of the Agreement, but the provisions of Section 11.1 hereof shall continue to govern the disclosure by one Party, whether by publication or otherwise, of Information of the other for two years after termination or expiration of this Agreement.”

11.4 Publicity/Use of Names. Section 11.4 of the Parent Agreement shall remain in full force and effect and shall apply to this 2013 Amendment. The Parties shall agree upon the timing and content of an initial press release relating to the execution of this 2013 Amendment and its terms.

Article 12 - Representations and Warranties; Indemnification

12.1 Authority. Each Party represents and warrants that this 2013 Amendment, including the release contained in Article 16 hereof, has been duly executed and delivered by such Party and constitutes a

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Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

valid and binding obligation of such Party, enforceable against such Party in accordance with its terms, except as enforceability may be limited by bankruptcy, fraudulent conveyance, insolvency, reorganization, moratorium and other laws related to creditors’ rights generally and by general equitable principles. The execution, delivery and performance of this Agreement have been duly authorized by all necessary action on the part of such Party, its officers and directors.

12.2 General. Article 12 of the Parent Agreement shall remain in full force and effect.

Article 13 - Term

Article 13 of the Parent Agreement is deleted in its entirety and replaced by the following:

13.1 Term. The Agreement shall be effective as of the Effective Date and shall continue in effect until the later of (i) the last to expire of the Janssen Assigned Patents or the Vertex Patent Rights licensed to Janssen pursuant to Article 7 of the Agreement or (ii) the last required payment by Janssen to Vertex pursuant to this Agreement.

13.2 Survival. Any expiration or termination of this Agreement shall be without prejudice to the rights of either Party against the other accrued or accruing under this Agreement prior to expiration or termination. In addition to any other provisions which by their terms specifically survive expiration or termination of this Agreement, the following provisions shall indefinitely survive any expiration or termination of the Agreement: Article 7 of this 2013 Amendment, Article 12 of this 2013 Amendment, Article 13 of this 2013 Amendment, Article 14 of this 2013 Amendment, Sections 14.1 and 14.5 of the Agreement, Article 15 of this 2013 Amendment, Article 15 of the Agreement, Article 16 of this 2013 Amendment, and the definitions of terms from Article 1 of the Parent Agreement and this 2013 Amendment that are used in any of the surviving provisions of the Agreement.

Article 14 - Governing Law and Dispute Resolution

14.1 Governing Law and Dispute Resolution. Article 14 of the Parent Agreement, as amended and supplemented by this 2013 Amendment, shall remain in full force and effect and shall apply to the provisions of this 2013 Amendment.

14.2 Amendment of Dispute Resolution Provisions. Section 14.3 of the Parent Agreement is deleted in its entirety as of the Amendment Effect Date and the following is substituted therefor:

“If the Executive Officers fail to come to consensus on any matter properly referred to the Executive Officers within the period for resolution set forth in Section 14.2 (an “Unresolved Matter”) such dispute shall be settled in accordance with Section 14.5 of the Agreement.”

Article 15 - Miscellaneous

15.1 Miscellaneous. Article 15 of the Parent Agreement shall remain in full force and effect and shall apply to the provisions of this 2013 Amendment.

Article 16 - Mutual Releases

16.1 Release of Janssen. Vertex, on behalf of itself and its Affiliates and, as applicable, each of its and its Affiliates’ employees, successors, assigns, current and former directors and officers, shareholders and direct and indirect parents, hereby fully and forever releases and discharges each of Janssen and its Affiliates, each of their employees, agents, attorneys, insurers, accountants, heirs, executors, administrators, conservators, successors, assigns, current and former directors and officers, shareholders and direct and indirect parents, subsidiaries and Affiliates from and against any and all liability, claims, demands, contracts, debts, obligations, damages, losses, actions, causes of action, or suits of whatever

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Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

kind or nature, whether known or unknown, based on any claim (each, a “Janssen Released Claim”) arising under the Parent Agreement and existing as of the Amendment Effective Date, except for any claims based on (i) breach by Janssen or its Affiliates of any payment obligation under the Parent Agreement, including any underpayment of royalties due to Vertex, [***] or [***], (ii) fraudulent acts by Janssen or its Affiliates in connection with the activities contemplated by the Parent Agreement, (iii) breach by Janssen or its Affiliates of its confidentiality obligations to Vertex under the Parent Agreement resulting in unauthorized disclosures to Third Parties or (iv) breach by Janssen or its Affiliates of the Pharmacovigilance Agreement. Vertex covenants not to sue or otherwise institute or prosecute any legal, administrative or other proceeding against any of Janssen or its Affiliates based on any Janssen Released Claim.

16.2 Release of Vertex. Janssen, on behalf of itself and its Affiliates and, as applicable, each of its and its Affiliates’ employees, successors, assigns, current and former directors and officers, stockholders and direct and indirect parents, hereby fully and forever releases and discharges each of Vertex and its Affiliates, each of their employees, agents, attorneys, insurers, accountants, heirs, executors, administrators, conservators, successors, assigns, current and former directors and officers, shareholders and direct and indirect parents, subsidiaries and Affiliates, from and against any and all liability, claims, demands, contracts, debts, obligations, damages, losses, actions, causes of action, or suits of whatever kind or nature, whether known or unknown, based on any claim (each, a “Vertex Released Claim”) arising under the Parent Agreement and existing as of the Amendment Effective Date, except for any claims based on (i) breach by Vertex or its Affiliates of any payment obligation to Janssen under the Parent Agreement, (ii) fraudulent acts by Vertex or its Affiliates in connection with the activities contemplated by the Parent Agreement, (iii) breach by Vertex or its Affiliates of its confidentiality obligations to Janssen under the Parent Agreement resulting in unauthorized disclosures to Third Parties or (iv) breach by Vertex or its Affiliates of the Pharmacovigilance Agreement. Janssen covenants not to sue or otherwise institute or prosecute any legal, administrative or other proceeding against Vertex or its Affiliates, based on any Vertex Released Claim.

16.3 Non-Assignment of Claims. Each Party hereto represents and warrants to the other Party that no portion of any claim, right, interest, demand, debt, liability, account, obligation or cause of action released herein has been assigned, conveyed or transferred, by operation of law or otherwise, to any other person or entity. In the event that any claim, demand or suit should be made or instituted against any Party hereto because of any such purported assignment, conveyance or transfer, the Party from whom such assignment, conveyance or transfer was alleged to have occurred agrees to indemnify and hold harmless the other Party against such claim, suit or demand and to pay and satisfy any such claim, suit or demand, including all expenses of investigation, attorneys’ fees and costs.

16.4 Later Discovered Facts. The Parties are aware that they may hereafter discover claims or facts in addition to or different from those they now know or believe to be true with respect to matters or things under or related to the Agreement, or any aspect of the relevant business relationship by or between the Parties. Nevertheless, it is the Parties’ intention to fully, finally, and forever settle and release all such matters and all claims within the scope of the above releases that may exist or may heretofore have existed.

16.5 Voluntary Execution. The Parties respectively represent and warrant that:

16.5.1    No Party has made any statement or representation to the other Party regarding any fact relied upon in entering into Article 16 of the 2013 Amendment. Article 16 of this 2013 Amendment is made without reliance upon any inducement, statement, promise, or representation other than those contained within this 2013 Amendment.

16.5.2    This 2013 amendment is executed voluntarily and without any duress or undue influence on the part of or on behalf of the Parties hereto, with the full intent of releasing all claims, except as expressly reserved herein.

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Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

IN WITNESS WHEREOF, the Parties have executed this 2013 Amendment as of the date set forth below.

JANSSEN PHARMACEUTICA, N.V.	VERTEX PHARMACEUTICALS INCORPORATED
By:/s/ Ludo F. Lauwers	By:/s/ Ian Smith
Name: Dr. Ludo F. Lauwers, M.D.	Name: Ian Smith
Title: Senior Vice President  Vice- Chairman Management Board  Janssen Pharmaceutica NV	Title: EVP & Chief Financial Officer
Date: November 19, 2013	Date: November 19, 2013
By:/s/ Peter Putteman
Name: Peter Putteman
Title: General Manager Janssen Supply Chain Beerse
Date: November 19, 2013

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Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

Schedule A

Assigned Patents

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Schedule A - Assigned Patents

[***]

[***]	Country Name	Application Number	[***]	Publication Number	Patent Number	Status	Issue Date	PTE/SPC Status	PTE/SPC Application Number	Filing or Grant / expiration date
[***]	ALBANIA	AL/P/2009/3085	[***]	1320540	1320540	Granted	13-May-2009	[***]	[***]	[***]
[***]	ARMENIA	200300318	[***]		11547	Granted	14-Jan-2009	[***]	[***]	[***]
[***]	ARMENIA	200701869	[***]		17556	Granted	30-Jan-2013	[***]	[***]	[***]
[***]	ARGENTINA	10104168	[***]		AR03035B1	Granted	24-Jan-2013	[***]	[***]	[***]
[***]	ARGENTINA	90102351	[***]	AR 072313		Published		[***]	[***]	[***]
[***]	ARGENTINA	90102352	[***]	AR 072314		Published		[***]	[***]	[***]
[***]	ARGENTINA	20120104265	[***]			Pending		[***]	[***]	[***]
[***]	AUSTRIA	E 431358	[***]	1320540	1320540	Granted	13-May-2009	Pending	SZ 9/2012	Filed 3/16/2012
[***]	AUSTRALIA	2001288318	[***]		2001288318	Granted	10-Jan-2008	Granted	[***]	Granted 2/13/13; Expires 8/31/26
[***]	AUSTRALIA	2007240156	[***]		2007240156	Granted	15-Mar-2012	Granted	[***]	Granted 3/21/13; Expires 8/31/26
[***]	AUSTRALIA	2012201015	[***]			Pending		[***]	[***]	[***]
[***]	AZERBAIJAN	200300318	[***]		11547	Granted	14-Jan-2009	[***]	[***]	[***]
[***]	AZERBAIJAN	200701869	[***]		17556	Granted	30-Jan-2013	[***]	[***]	[***]
[***]	BELGIUM	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	Pending	2012C/010	Filed 3/16/12
[***]	BRAZIL	0113666-6	[***]	1812		Published		[***]	[***]	[***]
[***]	BELARUS	200300318	[***]		11547	Granted	14-Jan-2009	[***]	[***]	[***]
[***]	BELARUS	200701869	[***]		17556	Granted	30-Jan-2013	[***]	[***]	[***]
[***]	SWITZERLAND	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	Pending	C01320540/01	Filed 3/8/12
[***]	SWITZERLAND	7012485.4	[***]	1878720	1878720	Granted	6-Oct-2010	[***]	[***]	[***]
[***]	CHILE	20822001	[***]		45990	Granted	6-Oct-2009	[***]	[***]	[***]
[***]	CHILE	3382007	[***]			Pending		[***]	[***]	[***]
[***]	CHILE	330-2010	[***]			Pending		[***]	[***]	[***]
[***]	COLOMBIA	3016961	[***]	545	59726	Granted	29-Oct-2010	[***]	[***]	[***]
[***]	COLOMBIA	3016961A	[***]		39902	Granted	30-Jul-2010	[***]	[***]	[***]
[***]	COLOMBIA	3016961C	[***]			Pending		[***]	[***]	[***]
[***]	CYPRUS	CY2009 1100765	[***]	1320540	1320540	Granted	13-May-2009	Granted	CY2012007	Granted 6/6/12; Expires 8/31/26
[***]	CZECH REPUBLIC	20030595	[***]			Pending		[***]	[***]	[***]
[***]	CZECH REPUBLIC	PV2013-353	[***]			Pending		[***]	[***]	[***]
[***]	GERMANY	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	Pending	122012000015.2	Filed 3/19/12
[***]	GERMANY	7012485.4	[***]	1878720	1878720	Granted	6-Oct-2010	[***]	[***]	[***]
[***]	DENMARK	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	Pending	CA 2012 00007	Filed 3/19/12
[***]	DENMARK	7012485.4	[***]	1878720	1878720	Granted	6-Oct-2010	[***]	[***]	[***]
[***]	ALGERIA	30064	[***]		3438	Granted	6-Sep-2005	[***]	[***]	[***]

2

Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

[***]	EURASIAN PATENT	200300318	[***]		11547	Granted	14-Jan-2009	[***]	[***]	[***]
[***]	EURASIAN PATENT	200701869	[***]		17556	Granted	30-Jan-2013	[***]	[***]	[***]
[***]	ECUADOR	34493	[***]			Pending		[***]	[***]	[***]
[***]	ECUADOR	77217	[***]			Pending		[***]	[***]	[***]
[***]	EGYPT	935/2001	[***]			Pending		[***]	[***]	[***]
[***]	EUROPEAN	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	[***]	[***]	[***]
[***]	EUROPEAN	7111000.1	[***]	1849797		Published		[***]	[***]	[***]
[***]	EUROPEAN	7012483.9	[***]	1958956		Published		[***]	[***]	[***]
[***]	EUROPEAN	7012484.7	[***]	1876173		Published		[***]	[***]	[***]
[***]	EUROPEAN	7012485.4	[***]	1878720	1878720	Granted	6-Oct-2010	[***]	[***]	[***]
[***]	EUROPEAN	10185132.7	[***]	2368877		Published		[***]	[***]	[***]
[***]	EUROPEAN	10185148.3	[***]	2368878		Published		[***]	[***]	[***]
[***]	EUROPEAN	10185155.8	[***]	2368901		Published		[***]	[***]	[***]
[***]	EUROPEAN	10185722.5	[***]	2371839		Published		[***]	[***]	[***]
[***]	SPAIN	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	Granted	201200008	Granted 12/17/12; Expires 8/31/26
[***]	SPAIN	7012485.4	[***]	1878720	1878720	Granted	6-Oct-2010	[***]	[***]	[***]
[***]	FINLAND	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	Pending	C20120011	Filed 3/16/12
[***]	FRANCE	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	Granted	12C0018	Granted 12/28/12; Expires 8/30/26
[***]	FRANCE	7012485.4	[***]	1878720	1878720	Granted	6-Oct-2010	[***]	[***]	[***]
[***]	UNITED KINGDOM	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	Pending	SPC/GB12/010	Filed 3/16/12
[***]	UNITED KINGDOM	7012485.4	[***]	1878720	1878720	Granted	6-Oct-2010	[***]	[***]	[***]
[***]	GREECE	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	Granted	20120800008	Granted 2/11/13; Expires 9/1/26
[***]	CROATIA	20030139	[***]	02/2005		Published		[***]	[***]	[***]
[***]	HUNGARY	300855	[***]			Pending		[***]	[***]	[***]
[***]	HUNGARY	P13 00255	[***]			Pending		[***]	[***]	[***]
[***]	IRELAND	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	Pending	2012/009	Filed 3/16/12
[***]	IRELAND	7012485.4	[***]	1878720	1878720	Granted	6-Oct-2010	[***]	[***]	[***]
[***]	ISRAEL	154671	[***]		154671	Granted	1-Mar-2012	Pending	[***]	Filed 6/10/12
[***]	ISRAEL	185644	[***]			Pending		[***]	[***]	[***]
[***]	ISRAEL	215892	[***]			Pending		[***]	[***]	[***]
[***]	ISRAEL	215890	[***]			Pending		[***]	[***]	[***]
[***]	ISRAEL	215891	[***]			Pending		[***]	[***]	[***]
[***]	INDIA	0242KOLNP2003	[***]		212710	Granted	12-Dec-2007	[***]	[***]	[***]
[***]	INDIA	865KOLNP07	[***]			Pending		[***]	[***]	[***]
[***]	ITALY	26598/BE/2009	[***]	1320540	1320540	Granted	13-May-2009	Granted	68544	Granted 4/23/12; Expires 8/31/26
[***]	ITALY	7012485.4	[***]	1878720	1878720	Granted	6-Oct-2010	[***]	[***]	[***]
[***]	KYRGYZSTAN	200300318	[***]		11547	Granted	14-Jan-2009	[***]	[***]	[***]
[***]	KYRGYZSTAN	200701869	[***]		17556	Granted	30-Jan-2013	[***]	[***]	[***]
[***]	KAZAKHSTAN	200300318	[***]		11547	Granted	14-Jan-2009	[***]	[***]	[***]

3

Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

[***]	KAZAKHSTAN	200701869	[***]		17556	Granted	30-Jan-2013	[***]	[***]	[***]
[***]	LITHUANIA	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	Granted	PA 2012 003	Granted 9/25/12; Expires 9/1/26
[***]	LUXEMBOURG	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	Granted	91 960	Granted 5/21/12; Expires 8/31/26
[***]	LUXEMBOURG	7012485.4	[***]	1878720	1878720	Granted	6-Oct-2010	[***]	[***]	[***]
[***]	LATVIA	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	Granted	C/LV2012/0005	Granted 12/20/12; Expires 8/31/26
[***]	MONACO	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	[***]	[***]	[***]
[***]	MONACO	7012485.4	[***]	1878720	1878720	Granted	6-Oct-2010	[***]	[***]	[***]
[***]	MOLDOVA	200300318	[***]		11547	Granted	14-Jan-2009	[***]	[***]	[***]
[***]	MOLDOVA	200701869	[***]		17556	Granted	30-Jan-2013	[***]	[***]	[***]
[***]	MACEDONIA	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	[***]	[***]	[***]
[***]	NIGERIA	372/2001	[***]		NG/C/2011/04	Granted	14-Mar-2011	[***]	[***]	[***]
[***]	NETHERLANDS	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	Granted	300518	Granted 8/31/12; Expires 8/31/26
[***]	NETHERLANDS	7012485.4	[***]	1878720	1878720	Granted	6-Oct-2010	[***]	[***]	[***]
[***]	NORWAY	20030928	[***]		329929	Granted	24-Jan-2011	Pending	2012006	Filed 4/3/12
[***]	NORWAY	20100999	[***]		330807	Granted	18-Jul-2011	[***]	[***]	[***]
[***]	NEW ZEALAND	541302	[***]	1534	541302	Granted	9-Aug-2007	[***]	[***]	[***]
[***]	NEW ZEALAND	569670	[***]	1569	569670	Granted	8-Jul-2010	[***]	[***]	[***]
[***]	PERU	876-2001	[***]		4184	Granted	9-Jan-2006	[***]	[***]	[***]
[***]	PAKISTAN	841/2001	[***]		140105	Pending		[***]	[***]	[***]
[***]	PAKISTAN	1191/2007	[***]		140115	Pending		[***]	[***]	[***]
[***]	PAKISTAN	1196/2007	[***]		140117	Pending		[***]	[***]	[***]
[***]	PAKISTAN	1192/2007	[***]		140116	Pending		[***]	[***]	[***]
[***]	POLAND	365836	[***]			Granted		Pending	0192/0211019	Filed 3/19/12
[***]	POLAND	389234	[***]			Pending		[***]	[***]	[***]
[***]	PORTUGAL	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	Pending	472	Filed 3/16/12
[***]	ROMANIA	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	Pending	C 2012 005	Filed 3/16/12
[***]	RUSSIA	200300318	[***]		11547	Granted	14-Jan-2009	Granted	[***]	Granted 7/15/13; Expires 8/31/26
[***]	RUSSIA	200701869	[***]		17556	Granted	30-Jan-2013	Granted	[***]	Granted 7/15/13; Expires 8/31/26
[***]	SWEDEN	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	Granted	1290007-2	Granted 10/2/12; Expires 8/31/26
[***]	SWEDEN	7012485.4	[***]	1878720	1878720	Granted	6-Oct-2010	[***]	[***]	[***]
[***]	SLOVENIA	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	Granted	C 2012 4 0004	Granted 10/3/12; Expires 8/31/26
[***]	SLOVAK REPUBLIC	20030249	[***]			Pending		[***]	[***]	[***]
[***]	TAJIKISTAN	200300318	[***]		11547	Granted	14-Jan-2009	[***]	[***]	[***]
[***]	TAJIKISTAN	200701869	[***]		17556	Granted	30-Jan-2013	[***]	[***]	[***]

4

Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

[***]	TURKMENISTAN	200300318	[***]		11547	Granted	14-Jan-2009	[***]	[***]	[***]
[***]	TURKMENISTAN	200701869	[***]		17556	Granted	30-Jan-2013	[***]	[***]	[***]
[***]	TURKEY	1968040.4	[***]	1320540	1320540	Granted	13-May-2009	[***]	[***]	[***]
[***]	UKRAINE	2003021834	[***]		81600	Granted	25-Jan-2008	[***]	[***]	[***]
[***]	UKRAINE	200710133	[***]		99895	Granted	25-Oct-2012	[***]	[***]	[***]
[***]	UKRAINE	201108596	[***]			Pending		[***]	[***]	[***]
[***]	VENEZUELA	2001-001867	[***]			Pending		[***]	[***]	[***]
[***]	SOUTH AFRICA	20031641	[***]		2003/1641	Granted	25-Aug-2004	[***]	[***]	[***]

5

Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

[***]

[***]	Country Name	Application Number	[***]	Publication Number	Patent Number	Status	Issue Date	PTE/SPC Status	PTE/SPC Application Number	Filing or Grant / expiration date
[***]	AUSTRALIA	2009238599.0	[***]			Pending		[***]	[***]	[***]
[***]	BRAZIL	PCT/US2009/002526	[***]			Pending		[***]	[***]	[***]
[***]	EURASIAN PATENT	201071230.0	[***]			Pending		[***]	[***]	[***]
[***]	EUROPEAN	9735729.7	[***]		2280709	Published		[***]	[***]	[***]
[***]	ISRAEL	208726.0	[***]			Pending		[***]	[***]	[***]
[***]	INDIA	8137/DELNP/2010	[***]			Pending		[***]	[***]	[***]
[***]	NEW ZEALAND	588655.0	[***]	588655		Granted	22-Mar-2013	[***]	[***]	[***]
[***]	SOUTH AFRICA	2010/07435	[***]	2010/07435		Granted		[***]	[***]	[***]

6

Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

[***]

[***]	Country Name	Application Number	[***]	Status	Publication Number	Patent Number	Issue Date	PTE/SPC Status	PTE/SPC Application Number	Filing or Grant / expiration date
[***]	CHILE	7012007	[***]	Published				[***]	[***]	[***]
[***]	EURASIAN PATENT	200802008	[***]	Pending				[***]	[***]	[***]
[***]	ISRAEL	194176	[***]	Pending				[***]	[***]	[***]
[***]	NEW ZEALAND	571934	[***]	Issued		571934	3-Sep-2012	[***]	[***]	[***]
[***]	PERU	308	[***]	Granted		000094-2011	31-Jan-2011	[***]	[***]	[***]

7

Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

[***]

[***]	Country Name	Application Number	[***]	Publication Number	Patent Number	Status	Issue Date	PTE/SPC Status	PTE/SPC Application Number	Filing or Grant / expiration date
[***]	ARGENTINA	P070101077	[***]			Pending		[***]	[***]	[***]
[***]	AUSTRALIA	2012202730	[***]			Pending		[***]	[***]	[***]
[***]	BRAZIL	PI 0709568-6	[***]	Pending		Published		[***]	[***]	[***]
[***]	CHILE	6892007	[***]			Pending		[***]	[***]	[***]
[***]	EUROPEAN	7752981.6	[***]	EP 1993993		Publshed		[***]	[***]	[***]
[***]	EUROPEAN	EP 11172239.3	[***]	EP 2 407 448		Published		[***]	[***]	[***]
[***]	ISRAEL	194115	[***]			Published		[***]	[***]	[***]
[***]	INDIA	3776KOLNP2008	[***]			Pending		[***]	[***]	[***]
[***]	NEW ZEALAND	571281	[***]		571281	Issued	5-Mar-2012	[***]	[***]	[***]
[***]	RUSSIA	2008140942	[***]		2481326	Issued	10-May-2013	[***]	[***]	[***]
[***]	RUSSIA	2013105768	[***]			Pending		[***]	[***]	[***]
[***]	SOUTH AFRICA	2008/08646	[***]		2008/08646	Issued	29-Jul-2009	[***]	[***]	[***]

8

Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

[***]

[***]	Country Name	Application Number	[***]	Publication Number	Patent Number	Status	Issue Date	PTE/SPC Status	PTE/SPC Application Number	Filing or Grant / expiration date
[***]	ARGENTINA	60103610	[***]	AR058025A1		Pending		[***]	[***]	[***]
[***]	AUSTRIA	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	AUSTRALIA	2006279357	[***]		2006279357	Issued	13-Sep-2012	[***]	[***]	[***]
[***]	AUSTRALIA	2012216599	[***]			Pending		[***]	[***]	[***]
[***]	AUSTRALIA	2013204565	[***]			Pending		[***]	[***]	[***]
[***]	AUSTRALIA	2013204689	[***]			Pending		[***]	[***]	[***]
[***]	BELGIUM	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	BRAZIL	0615029-2	[***]	Journal 2006		Published		[***]	[***]	[***]
[***]	SWITZERLAND	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	CHILE	2187-2006	[***]			Pending		[***]	[***]	[***]
[***]	CHILE	1813-2013	[***]			Pending		[***]	[***]	[***]
[***]	CYPRUS	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	CZECH REPUBLIC	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	GERMANY	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	DENMARK	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	EUROPEAN	6813568.0	[***]	1934179	1934179	Issued	11-Mar-2010	[***]	[***]	[***]
[***]	EUROPEAN	EP 10155058.0	[***]	EP 2194043		Published		[***]	[***]	[***]
[***]	EUROPEAN	EP 11150039.3	[***]	2357170		Published		[***]	[***]	[***]
[***]	EUROPEAN	EP 11150041.9	[***]	2364970		Published		[***]	[***]	[***]
[***]	SPAIN	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	FINLAND	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	FRANCE	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	UNITED KINGDOM	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	GREECE	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	HUNGARY	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	IRELAND	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	ISRAEL	189585	[***]			Pending		[***]	[***]	[***]
[***]	INDIA	738/KOLNP/2008	[***]			Pending		[***]	[***]	[***]
[***]	ITALY	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	LIECHTENSTEIN	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	LUXEMBOURG	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	MONACO	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	MALTA	N/A	[***]		3717	Issued	18-Aug-2006	[***]	[***]	[***]
[***]	NETHERLANDS	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	NEW ZEALAND	566049	[***]		566049	Issued	7-Nov-2011	[***]	[***]	[***]

9

Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

[***]	NEW ZEALAND	593214	[***]		593214	Issued	23-May-2013	[***]	[***]	[***]
[***]	NEW ZEALAND	604087	[***]			Pending		[***]	[***]	[***]
[***]	PORTUGAL	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	RUSSIA	2008110479	[***]		2446171	Issued	27-Mar-2012	[***]	[***]	[***]
[***]	RUSSIA	2011148615	[***]	2011148615		Published		[***]	[***]	[***]
[***]	SWEDEN	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	SLOVENIA	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	SLOVAK REPUBLIC	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	TURKEY	6813568.0	[***]		1934179	Issued	7-Apr-2010	[***]	[***]	[***]
[***]	SOUTH AFRICA	200801791	[***]		2008/01791	Issued	31-Dec-2008	[***]	[***]	[***]
[***]	AUSTRALIA	2010241800	[***]			Pending		[***]	[***]	[***]
[***]	BRAZIL	PI 1013338-0	[***]			Pending		[***]	[***]	[***]
[***]	CHILE	2657-2011	[***]	Pending		Published		[***]	[***]	[***]
[***]	EUROPEAN	EP 10716236.4	[***]	2477966		Published		[***]	[***]	[***]
[***]	ISRAEL	215893	[***]	Pending		Published		[***]	[***]	[***]
[***]	INDIA	4306/KOLNP/2011	[***]			Pending		[***]	[***]	[***]
[***]	NEW ZEALAND	595817	[***]			Pending		[***]	[***]	[***]
[***]	RUSSIA	2011148100	[***]			Published		[***]	[***]	[***]
[***]	SOUTH AFRICA	2011/08502	[***]		2011/08502	Issued	29-Aug-2012	[***]	[***]	[***]

10

Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

[***]

[***]	Country Name	Application Number	[***]	Publication Number	Patent Number	Status	Issue Date	PTE/SPC Status	PTE/SPC Application Number	Filing or Grant / expiration date
[***]	AUSTRALIA	2005302361	[***]		2005302361	Granted	1-Mar-2012	[***]	[***]	[***]
[***]	AUSTRALIA	2012200942	[***]			Pending		[***]	[***]	[***]
[***]	EUROPEAN	5815054.1	[***]	1819336		Published		[***]	[***]	[***]
[***]	EUROPEAN	11184992.3	[***]			Pending		[***]	[***]	[***]
[***]	ISRAEL	182847	[***]			Pending		[***]	[***]	[***]
[***]	NORWAY	20072733	[***]			Pending		[***]	[***]	[***]
[***]	RUSSIA	2007119725	[***]		2393863	Granted	10-Jul-2010	[***]	[***]	[***]

11

Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

[***]

[***]	Country Name	Application Number	[***]	Publication Number	Patent Number	Status	Issue Date	PTE/SPC Status	PTE/SPC Application Number	Filing or Grant / expiration date
[***]	ARGENTINA	50102345	[***]			Pending		[***]	[***]	[***]
[***]	AUSTRALIA	2005253957	[***]		2005253957	Granted	8-Dec-2011	[***]	[***]	[***]
[***]	BRAZIL	PI0511900.6	[***]			Published		[***]	[***]	[***]
[***]	EUROPEAN	5757623.3	[***]	1765283		Published		[***]	[***]	[***]
[***]	ISRAEL	179809	[***]			Granted	10-Jun-2013	[***]	[***]	[***]
[***]	ISRAEL		[***]			Pending		[***]	[***]	[***]
[***]	INDIA	7312/DELNP/2006	[***]			Published		[***]	[***]	[***]
[***]	NORWAY	20070130	[***]			Pending		[***]	[***]	[***]
[***]	NEW ZEALAND	588471	[***]		588471	Granted	5-Jun-2012	[***]	[***]	[***]
[***]	RUSSIA	2006147247	[***]		2373923	Granted	27-Nov-2009	[***]	[***]	[***]
[***]	SOUTH AFRICA	200700030	[***]		2007/00030	Granted	24-Jun-2009	[***]	[***]	[***]
[***]	SOUTH AFRICA	200802676	[***]		2008/02676	Granted	30-Dec-2009	[***]	[***]	[***]

12

Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

Schedule B

Patent Assignment

PATENT ASSIGNMENT

This patent assignment (“Assignment of Patents”) is made and entered into as of November 19, 2013, between, VERTEX PHARMACEUTICALS INCORPORATED, a Massachusetts corporation with corporate offices at 130 Waverly Street, Cambridge, MA 02139-4242, United States of America, (“Assignor”) and JANSSEN PHARMACEUTICA NV, a company organized under the laws of Belgium with offices at Turnhoutseweg 30, 2340 Beerse, Belgium (“Assignee”) (each a “Party” and collectively, the “Parties”).

Whereas, Assignor and Assignee are parties to an amendment to a License, Development, Manufacturing and Commercialization Agreement between the Parties (“2013 Amendment”), which amendment is dated as of the date mentioned hereinabove, pursuant to which Assignor has agreed to convey legal and equitable ownership of certain assets to Assignee;

Whereas, subject to the terms and conditions in the 2013 Amendment, Assignor owns all right, title and interest in and to the patents and patent applications listed on Schedule A; Assignor desires to convey, deliver, transfer and assign to Assignee all of its right, title and interest in and to the Patents, and Assignee desires to take delivery of, accept and assume from Assignor the same.

Now, therefore, for the foregoing recited consideration and other good and valuable consideration, the receipt and sufficiency of which is hereby acknowledged, the Parties, intending to be legally bound, agree as follows :

(a)Assignor does hereby convey, deliver, transfer and assign to Assignee all of its right, title and interest in and to (i) the patents and patent applications listed on Schedule A, (ii) all patent applications filed either from such patents, patent applications or from an application claiming priority from either of these, including divisionals, continuations, continuations-in-part, substitutions, provisionals, converted provisionals, and continued prosecution applications, (iii) any and all patents that have issued or in the future issue from the foregoing patent applications described in clauses (i) and (ii), including utility models, petty patents, design patents and certificates of invention, and (iv) any and all extensions or restorations by existing or future extension- or restoration mechanisms, including revalidations, reissues, reexaminations, supplemental examinations, inter partes reviews, post-grant reviews, pre-grant and post-grant oppositions, limitations, and other existing or future post-issuance proceedings, and extensions (including any supplementary protection certificates and any other patent term restoration mechanisms) of the foregoing patents and patent applications described in clauses (i), (ii) and (iii), (collectively, clauses (i), (ii), (iii) and (iv) called “Patents”), in each case, the same to be held and enjoyed by Assignee for its own use and benefit of the Patents that may be granted or extended, as fully and entirely as the same would have been held and enjoyed by Assignor had this assignment not been made, including all benefits, privileges, causes of action and remedies relating to, or otherwise derived from, such Patents, including the right to any damages accrued for infringement of the Patents, and all goodwill associated with such Patents; and

(b)Assignee accepts such assignment.

(Remainder of Page Intentionally Left Blank)

A- 1

Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

In witness whereof Assignor and Assignee have executed this Assignment of Patents as of the date written hereinabove.

AssignorWitness

VERTEX PHARMACEUTICALS INCORPORATED

By :_/s/ Ian Smith___________________        By :_/s/ Philippe Tinmouth__________

Name : _Ian Smith__________________        Name : _Phil Tinmouth_______________

Title : _EVP & CFO__________________

Notary Public

Acknowledged and accepted by:

AssigneeWitness

JANSSEN PHARMACEUTICA NV

By :_/s/ Ludo F. Lauwers_____________        By : _/s/ Liesbeth Vanhee___________

Name : _Dr. Ludo F. Lauwers, M.D._____        Name : _Liesbeth Vanhee___________

Title :     Senior Vice President_________

Vice-Chairman Management Board

Janssen Pharmaceutica NV

By :_/s/ Peter Putteman_______________        

Name : _Peter Putteman______________        

Title :     General Manager______________

Janssen Supply Chain Beerse                        

Notary Public

A- 2

Portions of this exhibit, indicated by the mark “[***],” have been redacted pursuant to a confidential treatment request. An unredacted version of this exhibit has been filed separately with the Commission.

EX-10.21

Exhibit 10.21

VERTEX PHARMACEUTICALS INCORPORATED

2013 STOCK AND OPTION PLAN

Form of Non-Qualified Stock Option Grant

This Agreement sets forth the terms and conditions of an Option granted pursuant to the provisions of the 2013 Stock and Option Plan (as it may be amended or restated, the “Plan”) of Vertex Pharmaceuticals Incorporated (the “Company”) to the Participant whose name appears below, covering the number of Shares of Common Stock of the Company set forth below, pursuant to the provisions of the Plan and on the following express terms and conditions. Capitalized terms not otherwise defined herein shall have the same meanings as set forth in the Plan, and any Options evidenced hereby are granted subject to the terms of the Plan.

1.Name and address of Participant to whom this Option is granted:

[INSERT NAME/ADDRESS]

2. Number of Shares of Common Stock subject to this Option:

[_____]

3.Purchase price of Shares subject to this Option:

[_____]

4.Date of grant of this Option:

[_____]

5.Expiration date of this Option: This Option shall expire on [_____], subject to earlier termination in the event of any Termination of Service or death of the Participant or otherwise in accordance with the provisions of the Plan. Except as provided in Section 6.5(a)(ii) of this Agreement, this Option may not be exercised later than (a) ninety (90) days after a Termination of Service of the Participant or (b) if the Participant dies while serving as an Employee, Non-Employee Director, consultant or advisor of the Company or an Affiliate, one (1) year after the Participant’s death.

6. Vesting.

6.1Vesting Schedule. This Option shall vest and become exercisable, so long as the Participant continues to serve as an Employee, Non-Employee Director, consultant or adviser of the Company or an Affiliate, [INSERT VESTING SCHEDULE], except as otherwise provided in Sections 6.2, 6.3, 6.4 or 6.5 of this Agreement. The vesting of this Option shall cease immediately upon a Termination of Service of Participant.

6.2Absence. This Option shall not vest during any period of long-term disability or personal leave of absence of the Participant from the Company or an Affiliate (as determined under applicable Company policies). If the Participant resumes employment with the Company after a personal leave of absence or long-term disability in accordance with applicable Company policies, vesting shall resume upon the resumption of eligibility, and the Option will continue vesting at the rate provided in Section 6.1 of this Agreement until fully vested. Notwithstanding the foregoing, in no event shall the term of the Option be extended beyond the date set forth in Section 5 of this Agreement.

6.3Death of the Participant. If the Participant dies while serving as an Employee, Non-Employee Director, consultant or advisor of the Company or an Affiliate, the vesting of all unvested Shares subject to this Option shall be accelerated, and the Option shall be exercisable as to such installments, together with any previously vested but unexercised portion of the Option, effective as of the date of death.

6.4Termination for Cause.

(a)If the Participant’s employment or other service to the Company is terminated by the Company for Cause (as defined below), the Company may, at its election, terminate the Participant’s right to exercise this Option (including with respect to any vested but unexercised Shares). If the Participant is notified that the Company is investigating or evaluating whether the Company will terminate Participant’s employment or other service to the Company for Cause, the Company may, at its election, suspend Participant’s right to exercise this Option by written notice to the Participant. If after such notification it is determined or otherwise agreed that Participant’s service to the Company will not be terminated for Cause, vesting of the Shares shall resume pursuant to the original schedule and any Shares that would have vested during such time as vesting was suspended shall immediately vest.

(b)“Cause” shall mean (i) the Participant’s dishonesty or fraud, or (ii) the willful misconduct by the Participant or willful failure by the Participant to perform his or her responsibilities to the Company (including, without limitation, any material breach by the Participant of any provision of any Company policy or any employment, consulting, advisory, nondisclosure, non-competition or other similar agreement between the Participant and the Company), in each case as determined in good faith by the Company, which determination shall be conclusive; provided, however, that if there is a conflict between this definition of Cause and either (1) the definition of “Cause” contained in any employment agreement between the Company and the Participant or (2) the definition of “Cause” contained in any change-of-control agreement between the Company and the Participant, then such other definition shall be controlling for purposes of this Agreement.

[6.5    Career Employment Provision.

(a)If a Participant experiences a Termination of Service other than for Cause, and the Participant is a Qualified Participant (as defined below), then (i) an additional number of Shares equal to (A) the sum of 50% plus 10% for each full year of service as an Employee to the Company or an Affiliate in excess of five (5) full years of service multiplied by (B) the number of unvested Shares subject to this Option immediately prior to the Participant's Termination of Service, shall vest; and (ii) all vested but unexercised Shares (including any shares that vested pursuant to the preceding subsection (i)) may be exercised until the expiration date of this Option as set forth in Section 5 of this Agreement.

(b)A “Qualified Participant” shall mean a Participant (i) who is at least fifty-five (55) years old, (ii) who has completed at least five (5) full years of service as an Employee to the Company or an Affiliate, (iii) whose age plus full years of service to the Company is 65 or greater and (iv) who has completed a transitional period of employment with the Company following notice of the Termination of Service, the duration of which will be determined by the Company but in no event will exceed six (6) months, except as may be required by applicable law.](1)

7.Non-Qualified Option. This Option is a Non-Qualified Option that is not intended to qualify as an ISO within the meaning of Section 422(b) of the Code.

8.Plan. The Participant hereby acknowledges receipt of a copy of the Plan as presently in effect. The text and all of the terms and provisions of the Plan are incorporated herein by reference, and this Agreement is subject to these terms and provisions in all respects.

9.Exercise. The Participant may exercise this Option in the manner set forth in Section 9 of the Plan.

10. Restrictions on Transfer. Except as provided in Section 10 of the Plan, this Option may not be sold, transferred, assigned, hypothecated, pledged, encumbered or otherwise disposed of, whether voluntarily or by operation of law. Any such purported transfer shall be null and void, and shall not be recognized by the Company.

11. International Employees. This Option shall be subject to the additional terms and provisions, if any, applicable to such Participant as are set forth on an Exhibit A to this Agreement, which terms and conditions are incorporated herein by reference.

VERTEX PHARMACEUTICALS INCORPORATED

By: ___________________________

--------------------

(1) Applicable to grants made on or after February 5, 2014.

EX-10.22

Exhibit 10.22

VERTEX PHARMACEUTICALS INCORPORATED

2013 STOCK AND OPTION PLAN

Form of Restricted Stock Award

This Agreement sets forth the terms and conditions of a Stock Grant granted pursuant to the provisions of the 2013 Stock and Option Plan (as it may be amended or restated, the “Plan”) of Vertex Pharmaceuticals Incorporated (the “Company”) to the Participant whose name appears below, for the number of Shares of Common Stock of the Company set forth below, pursuant to the provisions of the Plan and on the following express terms and conditions. Capitalized terms not otherwise defined herein shall have the same meanings as set forth in the Plan, and any Stock Grants evidenced hereby are granted subject to the terms of the Plan.

1.Name and address of Participant to whom the Shares are granted:

[INSERT NAME/ADDRESS]

2.Number of Shares of Common Stock in Stock Grant (the “Shares”):

[_____]

3.Purchase price of Shares:

[_____]

4.Date of grant of the Shares:

[_____]

5.Vesting and Company’s Repurchase Rights.

5.1Vesting Schedule. [INSERT VESTING SCHEDULE]. Except as provided in Section 5.5 of this Agreement, upon any Termination of Service of the Participant, vesting of the Shares shall immediately cease, and the Company shall have a right to repurchase any unvested Shares from the Participant at a price per Share equal to the purchase price per Share set forth in Section 3 of this Agreement.

5.2Death of the Participant. If the Participant dies while an Employee, Non-Employee Director, consultant or advisor of the Company or an Affiliate, the vesting of all unvested Shares subject to this Stock Grant shall be accelerated and shall vest on the date of death of the Participant.

5.3 Termination for Cause.

(a)If the Participant is notified that the Company is investigating or evaluating whether the Company will terminate Participant’s employment or other service to the Company for Cause, the Company may, at its election, suspend the vesting of any unvested Shares by written notice to the Participant (and if the Participant’s employment or other service to the Company is thereafter terminated for Cause, the Company may, at its election, repurchase any remaining unvested Shares from the Participant at a price per Share equal to the purchase price per Share set forth in Section 3 of this Agreement). If after such notification it is determined or otherwise agreed that Participant’s service to the Company will not be terminated for Cause, vesting of the Shares shall resume pursuant to the original schedule and any Shares that would have vested during such suspension immediately shall vest.

(b)“Cause” shall mean (i) the Participant’s dishonesty or fraud, or (ii) the willful misconduct by the Participant or willful failure by the Participant to perform his or her responsibilities to the Company (including, without limitation, any material breach by the Participant of any provision of any Company policy or any employment, consulting, advisory, nondisclosure, non-competition or other similar agreement between the Participant and the Company), in each case as determined in good faith by the Company, which determination shall be conclusive; provided, however, that if there is a conflict between this definition of Cause and either (1) the definition of “Cause” contained in any employment agreement between the Company and the Participant or (2) the definition of “Cause” contained in any change-of-control agreement between the Company and the Participant, then such other definition shall be controlling for purposes of this Agreement.

5.4Repurchase Rights. The Company’s rights to repurchase the Shares pursuant to Sections 5.1, 5.3 or 5.5 of this Agreement shall be valid for a period of one year beginning on the date of the Termination of Service of the Participant. Notwithstanding any other provision hereof, if the Company is prohibited during such one-year period from exercising its lapsing repurchase right by applicable law, then the time period during which such repurchase right may be exercised shall be extended until the later of (a) the end of such one-year period or (b) 30 days after the Company is first not so prohibited.

[5.5Career Employment Provision. If a Participant experiences a Termination of Service other than for Cause, and the Participant is a Qualified Participant (as defined below), then an additional number of Shares equal to (a) the sum of 50% plus 10% for each full year of service as an Employee to the Company or an Affiliate in excess of five (5) full years of service multiplied by (b) the number of unvested Shares subject to this Stock Grant immediately prior to the Participant’s Termination of Service, shall vest. A “Qualified Participant” shall mean a Participant (i) who is at least fifty-five (55) years old, (ii) who has completed at least five (5) full years of service as an Employee to the Company or an Affiliate, (iii) whose age plus full years of service to the Company is 65 or greater and (iv) who has completed a transitional period of employment with the Company following notice of the Termination of Service, the duration of which will be determined by the Company but in no event will exceed six (6) months, except as may be required by applicable law. The Company shall have the right to repurchase any remaining unvested Shares from the Participant at a price per Share equal to the purchase price per Share set forth in Section 3 of this Agreement.](1)

6.Agreement with respect to Tax Payments, Withholding and Sale of a Portion of Shares. The Participant acknowledges and agrees that any income or other taxes due from the Participant with respect to the Shares issued pursuant to this Agreement, including on account of the vesting of the Shares, shall be the Participant’s responsibility. [In connection with the foregoing, the Participant agrees that the Company shall authorize a registered broker (the “Broker”) to sell, on the next trading day after the lapse of the Company’s lapsing repurchase right, that number of Shares as the Company instructs the Broker to sell solely to satisfy the Company’s tax withholding obligations, after deduction of the Broker’s commission, and the Broker shall remit to the Company the cash necessary in order for the Company to satisfy its withholding obligation, provided, however, that the Company shall not authorize any such sale if the Participant shall have issued a binding instruction (the “Instruction”) to the Company, in form satisfactory to the Company, which instruction may be delivered at any time prior to the 30^th day after the date of grant of the Shares, that provides that the Company shall not instruct the Broker to sell such Shares. Any such Instruction shall include an undertaking by the Participant to pay the Company the amount of any tax withholding in accordance with the Company’s policies then in effect. The Participant agrees to pay to the Company as soon as practicable, including through payroll, the amount of any tax withholding, that is for whatever reason, not satisfied by such Broker’s sale. The Participant acknowledges that this Section 6 is intended to comply with Section 10b5-1(c)(1)(i)(B) under the Securities Exchange Act of 1934, as amended, and that the delivery of the Shares shall be made by the Company after satisfaction of the tax withholding payments as set forth in Section 8 of this Agreement. The Participant agrees to hold the Company and the Broker harmless from all costs, damages or expenses relating to any such sale, and acknowledges that the Company and the Broker are under no obligation to arrange for such sale at any particular

price. The Participant further acknowledges that the grant of Shares made hereunder is subject to Participant’s acceptance of the terms of this Section 6, and other terms and provisions of this Agreement.](2)

7.Restrictions on Transfer. Except as provided in Section 10 of the Plan, the Shares may not be sold, transferred, assigned, hypothecated, pledged, encumbered or otherwise disposed of, whether voluntarily or by operation of law, at any time before they become vested Shares pursuant to Section 5 of this Agreement. Any such purported transfer shall be null and void, and shall not be recognized by the Company or recorded on its books.

8.Escrow. All Shares that have not vested pursuant to Section 5 of this Agreement, together with any securities distributed in respect thereof, such as through a stock split or other recapitalization, shall be held by the Company in escrow until such Shares shall have vested and the deposit required for tax withholding has been made pursuant to Section 6 of this Agreement. The Company promptly shall release vested Shares from escrow upon satisfaction of the foregoing conditions.

9.Plan. The Participant hereby acknowledges receipt of a copy of the Plan as presently in effect and the Prospectus with respect thereto. All of the terms and provisions of the Plan are incorporated herein by reference, and this Restricted Stock Award is subject to those terms and provisions in all respects.

VERTEX PHARMACEUTICALS INCORPORATED

By: ___________________________

-------------

(1) Applicable to grants made on or after February 5, 2014.

(2) For Section 16 Officers, replace bracketed language with the following: “By accepting this Agreement, the Participant agrees and acknowledges that (i) the Company promptly will withhold from the Participant's pay the amount of taxes the Company is required to withhold upon any vesting of Shares pursuant to this Agreement, and (ii) the Participant shall make immediate payment to the Company in the amount of any tax required to be withheld by the Company in excess of the Participant's pay available for such withholding.”

EX-10.23

Exhibit 10.23

VERTEX PHARMACEUTICALS INCORPORATED

2013 STOCK AND OPTION PLAN

Form of Restricted Stock Unit Award

This Agreement sets forth the terms and conditions of a Restricted Stock Unit Award granted pursuant to the provisions of the 2013 Stock and Option Plan (as it may be amended or restated, the “Plan”) of Vertex Pharmaceuticals Incorporated (the “Company”) to the Participant whose name appears below, of a contingent entitlement of the Participant to receive the number of Shares of Common Stock of the Company set forth below, pursuant to the provisions of the Plan and on the following express terms and conditions. Capitalized terms not otherwise defined herein shall have the same meanings as set forth in the Plan, and any Restricted Stock Units evidenced hereby are granted subject to the terms of the Plan.

1.Name and address of Participant to whom the Restricted Stock Unit Award is granted:

[INSERT NAME/ADDRESS]

2.Number of Shares of Common Stock in the Restricted Stock Unit Award (the “Shares”):

[_____]

3.Purchase price of Shares upon Vesting:

[_____]

4.Date of grant of the Restricted Stock Unit Award:

[_____]

5.Vesting.

5.1Vesting Schedule. [INSERT VESTING SCHEDULE]. On each vesting date described in the preceding sentence, the Participant shall be entitled to receive at the purchase price, the applicable number of shares of Common Stock that shall thereafter be delivered by the Company to the Participant in accordance with this Agreement and the Plan within thirty days of the applicable vesting date. Except as provided in Section 5.4 of this Agreement, upon any Termination of Service of the Participant for any reason, vesting of the Shares shall immediately cease, and the unvested portion of the Restricted Stock Unit Award shall immediately be forfeited.

5.2Death of the Participant. If the Participant dies while an Employee, Non-Employee Director, consultant or advisor of the Company or an Affiliate, the vesting of all unvested Shares subject to this Restricted Stock Unit Award shall be accelerated and shall vest on the date of death of the Participant.

5.3 Termination for Cause.

(a)If the Participant is notified that the Company is investigating or evaluating whether the Company will terminate Participant’s employment or other service to the Company for Cause, the Company may, at its election, suspend the vesting of this Restricted Stock Unit Award by written notice to the Participant. If after such notification it is determined or otherwise agreed that Participant’s service to the Company will not be terminated for Cause, vesting of the Shares shall resume pursuant to the original schedule and any Shares that would have vested during such suspension immediately shall vest.

(b)“Cause” shall mean (i) the Participant’s dishonesty or fraud, or (ii) the willful misconduct by the Participant or willful failure by the Participant to perform his or her responsibilities to the Company (including, without limitation, any material breach by the Participant of any provision of any Company policy or any employment, consulting, advisory, nondisclosure, non-competition or other similar agreement between the Participant and the Company), in each case as determined in good faith by the Company, which determination shall be conclusive; provided, however, that if there is a conflict between this definition of Cause and either (1) the definition of “Cause” contained in any employment agreement between the Company and the Participant or (2) the definition of “Cause” contained in any change-of-control agreement between the Company and the Participant, then such other definition shall be controlling for purposes of this Agreement.

[5.4Career Employment Provision. If a Participant experiences a Termination of Service other than for Cause, and the Participant is a Qualified Participant (as defined below), then (a) an additional number of Shares equal to (i) the sum of 50% plus 10% for each full year of service as an Employee to the Company or an Affiliate in excess of five (5) full years of service multiplied by (ii) the number of unvested Shares subject to this Restricted Stock Unit Award immediately prior to the Participant’s Termination of Service, shall vest on the date of the Termination of Service and (b) any remaining unvested Shares shall be forfeited. A “Qualified Participant” shall mean a Participant (A) who is at least fifty-five (55) years old, (B) who has completed at least five (5) full years of service as an Employee to the Company or an Affiliate, (C) whose age plus full years of service to the Company is 65 or greater and (D) who has completed a transitional period of employment with the Company following notice of the Termination of Service, the duration of which will be determined by the Company but in no event will exceed six (6) months, except as may be required by applicable law.](1)

6.Agreement with respect to Tax Payments, Withholding and Sale of a Portion of Shares. The Participant acknowledges and agrees that any income or other taxes, fees or social security or comparable contributions due from the Participant with respect to the vesting of the Restricted Stock Unit Award or the issuance of Shares pursuant to this Agreement shall be the Participant’s responsibility. In connection with the foregoing, the Participant agrees that the Company shall authorize a registered broker (the “Broker”) to sell, on the next trading day after the date of vesting of any portion of the Restricted Stock Unit Award, that number of Shares as the Company instructs the Broker to sell solely to satisfy the Company’s tax withholding obligations, after deduction of the Broker’s commission, and the Broker shall remit to the Company the cash necessary in order for the Company to satisfy its withholding obligation, provided, however, that the Company shall not authorize any such sale if the Participant shall have issued a binding instruction (the “Instruction”) to the Company, in form satisfactory to the Company, which instruction may be delivered at any time prior to the 30^th day after the date of grant of the Restricted Stock Unit Award, that provides that the Company shall not instruct the Broker to sell such Shares. Any such Instruction shall include an undertaking by the Participant to pay the Company the amount of any tax withholding in accordance with the Company’s policies then in effect. The Participant agrees to pay to the Company as soon as practicable, including through payroll, the amount of any tax withholding, that is for whatever reason, not satisfied by such Broker’s sale. The Participant acknowledges that this Section 6 is intended to comply with Section 10b5-1(c)(1)(i)(B) under the Securities Exchange Act of 1934, as amended, and that the delivery of the Shares shall be made by the Company after satisfaction of the tax withholding payments as set forth herein. The Participant agrees to hold the Company and the Broker harmless from all costs, damages or expenses relating to any such sale, and acknowledges that the Company and the Broker are under no obligation to arrange for such sale at any particular price. The Participant further acknowledges that the Restricted Stock Unit Award made hereunder is subject to Participant’s acceptance of the terms of this Section 6, and other terms and provisions of this Agreement.

7.Restrictions on Transfer. Except as provided in Section 10 of the Plan, this Restricted Stock Unit Award may not be sold, transferred, assigned, hypothecated, pledged, encumbered or otherwise disposed of, whether voluntarily or by operation of law, at any time before the Participant receives Shares. Any such purported transfer shall be null and void, and shall not be recognized by the Company or recorded on its books.

8.No Rights as a Shareholder Until Exercise. The Participant shall have no rights as a shareholder, including voting and dividend rights, with respect to the Restricted Stock Unit Award subject to this Agreement.

9.No Obligation to Maintain Relationship. The Participant acknowledges that: (i) the Company is not by the Plan or this Restricted Stock Unit Award obligated to continue the Participant as an Employee, Non-Employee Director, consultant or advisor of the Company or an Affiliate; (ii) the Plan is discretionary in nature and may be modified, suspended or terminated by the Company at any time; (iii) the grant of the Restricted Stock Unit Award is a one-time benefit that does not create any contractual or other right to receive future grants of equity, or benefits in lieu thereof; (iv) all determinations with respect to any such future grants, including, but not limited to, the times when awards shall be granted, the number of shares subject to each restricted stock unit award, and the time or times when each award shall vest, will be at the sole discretion of the Company; (v) the Participant’s participation in the Plan is voluntary; (vi) the value of the Restricted Stock Unit Award is an extraordinary item of compensation which is outside the scope of the Participant’s employment or consulting contract, if any; and (vii) the Restricted Stock Unit Award is not part of normal or expected compensation for purposes of calculating any severance, resignation, redundancy, end of service payments, bonuses, long-service awards, pension or retirement benefits or similar payments.

10.Plan. The Participant hereby acknowledges receipt of a copy of the Plan as presently in effect and the Prospectus with respect thereto. All of the terms and provisions of the Plan are incorporated herein by reference, and this Restricted Stock Unit Award is subject to those terms and provisions in all respects.

11.Data Privacy. By entering into this Agreement, the Participant: (i) consents to the collection, use and disclosure of personal information (which may include name, home and business contact information, personal identifiers such a date of birth and the social insurance number for tax reporting purposes, employment, position and compensation) by the Company for the purpose of administering the Plan, providing Plan recordkeeping services and facilitating the grant of options; (ii) consents to the disclosure of this information by the Company to any Affiliate of the Company for such purposes; and (iii) authorizes the Company and each Affiliate to store and transmit such information in electronic form. Some of these Affiliates are located in, and the Plan will be administered (in whole or in part) in, the United States and some or all of the personal information may become subject to the laws of, and accessible to, the authorities of the United States. The file containing the Participant’s personal information will be kept at the offices of the Company or on its servers or those of its Affiliates and service providers, and only employees of the Company, its Affiliates or service providers who require it for the purposes of their duties will have access to this file. The Participant may request access to this file and the correction of inaccurate information, to the extent provided by law, by contacting •.

12. International Employees. This Restricted Stock Unit Award shall be subject to the additional terms and provisions, if any, applicable to the Participant as are set forth on an Exhibit A to this Agreement, which terms and conditions are incorporated herein by reference.

VERTEX PHARMACEUTICALS INCORPORATED

By:__________________________

--------------------

(1) Applicable to grants made on or after February 5, 2014.

EX-10.24

Exhibit 10.24

VERTEX PHARMACEUTICALS INCORPORATED

AMENDED AND RESTATED 2006 STOCK AND OPTION PLAN

Form of Non-Qualified Stock Option Grant

This Agreement sets forth the terms and conditions of an Option granted pursuant to the provisions of the Amended and Restated 2006 Stock and Option Plan (as it may be amended or restated, the “Plan”) of Vertex Pharmaceuticals Incorporated (the “Company”) to the Participant whose name appears below, covering the number of Shares of Common Stock of the Company set forth below, pursuant to the provisions of the Plan and on the following express terms and conditions. Capitalized terms not otherwise defined herein shall have the same meanings as set forth in the Plan, and any Options evidenced hereby are granted subject to the terms of the Plan.

1.Name and address of Participant to whom this Option is granted:

[INSERT NAME/ADDRESS]

2. Number of Shares of Common Stock subject to this Option:

[_____]

3.Purchase price of Shares subject to this Option:

[_____]

4.Date of grant of this Option:

[_____]

5.Expiration date of this Option: This Option shall expire on [_____], subject to earlier termination in the event of any Termination of Service or death of the Participant or otherwise in accordance with the provisions of the Plan. Except as provided in Section 6.5(a)(ii) of this Agreement, this Option may not be exercised later than (a) three (3) months after a Termination of Service of the Participant or (b) if the Participant dies while serving as an Employee, Non-Employee Director, consultant or advisor of the Company or an Affiliate, one (1) year after the Participant’s death.

6. Vesting.

6.1Vesting Schedule. This Option shall vest and become exercisable, so long as the Participant continues to serve as an Employee, Non-Employee Director, consultant or adviser of the Company or an Affiliate, [INSERT VESTING SCHEDULE], except as otherwise provided in Sections 6.2, 6.3, 6.4 or 6.5 of this Agreement. The vesting of this Option shall cease immediately upon a Termination of Service of Participant.

6.2Absence. This Option shall not vest during any period of long-term disability or personal leave of absence of the Participant from the Company or an Affiliate (as determined under applicable Company policies). If the Participant resumes employment with the Company after a personal leave of absence or long-term disability in accordance with applicable Company policies, vesting shall resume upon the resumption of eligibility, and the Option will continue vesting at the rate provided in Section 6.1 of this Agreement until fully vested. Notwithstanding the foregoing, in no event shall the term of the Option be extended beyond the date set forth in Section 5 of this Agreement.

6.3Death of the Participant. If the Participant dies while serving as an Employee, Non-Employee Director, consultant or advisor of the Company or an Affiliate, the vesting of all unvested Shares subject to this Option shall be accelerated, and the Option shall be exercisable as to such installments, together with any previously vested but unexercised portion of the Option, effective as of the date of death.

6.4Termination for Cause.

(a)If the Participant’s employment or other service to the Company is terminated by the Company for Cause (as defined below), the Company may, at its election, terminate the Participant’s right to exercise this Option (including with respect to any vested but unexercised Shares). If the Participant is notified that the Company is investigating or evaluating whether the Company will terminate Participant’s employment or other service to the Company for Cause, the Company may, at its election, suspend Participant’s right to exercise this Option by written notice to the Participant. If after such notification it is determined or otherwise agreed that Participant’s service to the Company will not be terminated for Cause, vesting of the Shares shall resume pursuant to the original schedule and any Shares that would have vested during such time as vesting was suspended shall immediately vest.

(b)“Cause” shall mean (i) the Participant’s dishonesty or fraud, or (ii) the willful misconduct by the Participant or willful failure by the Participant to perform his or her responsibilities to the Company (including, without limitation, any material breach by the Participant of any provision of any Company policy or any employment, consulting, advisory, nondisclosure, non-competition or other similar agreement between the Participant and the Company), in each case as determined in good faith by the Company, which determination shall be conclusive; provided, however, that if there is a conflict between this definition of Cause and either (1) the definition of “Cause” contained in any employment agreement between the Company and the Participant or (2) the definition of “Cause” contained in any change-of-control agreement between the Company and the Participant, then such other definition shall be controlling for purposes of this Agreement.

[6.5    Career Employment Provision.

(a)If a Participant experiences a Termination of Service other than for Cause, and the Participant is a Qualified Participant (as defined below), then (i) an additional number of Shares equal to (A) the sum of 50% plus 10% for each full year of service as an Employee to the Company or an Affiliate in excess of five (5) full years of service multiplied by (B) the number of unvested Shares subject to this Option immediately prior to the Participant's Termination of Service, shall vest; and (ii) all vested but unexercised Shares (including any shares that vested pursuant to the preceding subsection (i)) may be exercised until the expiration date of this Option as set forth in Section 5 of this Agreement.

(b)A “Qualified Participant” shall mean a Participant (i) who is at least fifty-five (55) years old, (ii) who has completed at least five (5) full years of service as an Employee to the Company or an Affiliate, (iii) whose age plus full years of service to the Company is 65 or greater and (iv) who has completed a transitional period of employment with the Company following notice of the Termination of Service, the duration of which will be determined by the Company but in no event will exceed six (6) months, except as may be required by applicable law.](1)

7.Non-Qualified Option. This Option is a Non-Qualified Option that is not intended to qualify as an ISO within the meaning of Section 422(b) of the Code.

8.Plan. The Participant hereby acknowledges receipt of a copy of the Plan as presently in effect. The text and all of the terms and provisions of the Plan are incorporated herein by reference, and this Agreement is subject to these terms and provisions in all respects.

9.Exercise. The Participant may exercise this Option in the manner set forth in Section 9 of the Plan.

10. Restrictions on Transfer. Except as provided in Section 10 of the Plan, this Option may not be sold, transferred, assigned, hypothecated, pledged, encumbered or otherwise disposed of, whether voluntarily or by operation of law. Any such purported transfer shall be null and void, and shall not be recognized by the Company.

11. International Employees. This Option shall be subject to the additional terms and provisions, if any, applicable to such Participant as are set forth on an Exhibit A to this Agreement, which terms and conditions are incorporated herein by reference.

VERTEX PHARMACEUTICALS INCORPORATED

By: ___________________________

--------------------

(1) Applicable to grants made on or after February 5, 2014.

EX-10.25

Exhibit 10.25

VERTEX PHARMACEUTICALS INCORPORATED

AMENDED AND RESTATED 2006 STOCK AND OPTION PLAN

Form of Restricted Stock Award

This Agreement sets forth the terms and conditions of a Stock Grant granted pursuant to the provisions of the Amended and Restated 2006 Stock and Option Plan (as it may be amended or restated, the “Plan”) of Vertex Pharmaceuticals Incorporated (the “Company”) to the Participant whose name appears below, for the number of Shares of Common Stock of the Company set forth below, pursuant to the provisions of the Plan and on the following express terms and conditions. Capitalized terms not otherwise defined herein shall have the same meanings as set forth in the Plan, and any Stock Grants evidenced hereby are granted subject to the terms of the Plan.

1.Name and address of Participant to whom the Shares are granted:

[INSERT NAME/ADDRESS]

2.Number of Shares of Common Stock in Stock Grant (the “Shares”):

[_____]

3.Purchase price of Shares:

[_____]

4.Date of grant of the Shares:

[_____]

5.Vesting and Company’s Repurchase Rights.

5.1Vesting Schedule. [INSERT VESTING SCHEDULE]. Except as provided in Section 5.5 of this Agreement, upon any Termination of Service of the Participant, vesting of the Shares shall immediately cease, and the Company shall have a right to repurchase any unvested Shares from the Participant at a price per Share equal to the purchase price per Share set forth in Section 3 of this Agreement.

5.2Death of the Participant. If the Participant dies while an Employee, Non-Employee Director, consultant or advisor of the Company or an Affiliate, the vesting of all unvested Shares subject to this Stock Grant shall be accelerated and shall vest on the date of death of the Participant.

5.3 Termination for Cause.

(a)If the Participant is notified that the Company is investigating or evaluating whether the Company will terminate Participant’s employment or other service to the Company for Cause, the Company may, at its election, suspend the vesting of any unvested Shares by written notice to the Participant (and if the Participant’s employment or other service to the Company is thereafter terminated for Cause, the Company may, at its election, repurchase any remaining unvested Shares from the Participant at a price per Share equal to the purchase price per Share set forth in Section 3 of this Agreement). If after such notification it is determined or otherwise agreed that Participant’s service to the Company will not be terminated for Cause, vesting of the Shares

shall resume pursuant to the original schedule and any Shares that would have vested during such suspension immediately shall vest.

(b)“Cause” shall mean (i) the Participant’s dishonesty or fraud, or (ii) the willful misconduct by the Participant or willful failure by the Participant to perform his or her responsibilities to the Company (including, without limitation, any material breach by the Participant of any provision of any Company policy or any employment, consulting, advisory, nondisclosure, non-competition or other similar agreement between the Participant and the Company), in each case as determined in good faith by the Company, which determination shall be conclusive; provided, however, that if there is a conflict between this definition of Cause and either (1) the definition of “Cause” contained in any employment agreement between the Company and the Participant or (2) the definition of “Cause” contained in any change-of-control agreement between the Company and the Participant, then such other definition shall be controlling for purposes of this Agreement.

5.4Repurchase Rights. The Company’s rights to repurchase the Shares pursuant to Sections 5.1, 5.3 or 5.5 of this Agreement shall be valid for a period of one year beginning on the date of the Termination of Service of the Participant. Notwithstanding any other provision hereof, if the Company is prohibited during such one-year period from exercising its lapsing repurchase right by applicable law, then the time period during which such repurchase right may be exercised shall be extended until the later of (a) the end of such one-year period or (b) 30 days after the Company is first not so prohibited.

[5.5Career Employment Provision. If a Participant experiences a Termination of Service other than for Cause, and the Participant is a Qualified Participant (as defined below), then an additional number of Shares equal to (a) the sum of 50% plus 10% for each full year of service as an Employee to the Company or an Affiliate in excess of five (5) full years of service multiplied by (b) the number of unvested Shares subject to this Stock Grant immediately prior to the Participant’s Termination of Service, shall vest. A “Qualified Participant” shall mean a Participant (i) who is at least fifty-five (55) years old, (ii) who has completed at least five (5) full years of service as an Employee to the Company or an Affiliate, (iii) whose age plus full years of service to the Company is 65 or greater and (iv) who has completed a transitional period of employment with the Company following notice of the Termination of Service, the duration of which will be determined by the Company but in no event will exceed six (6) months, except as may be required by applicable law. The Company shall have the right to repurchase any remaining unvested Shares from the Participant at a price per Share equal to the purchase price per Share set forth in Section 3 of this Agreement.](1)

6.Agreement with respect to Tax Payments, Withholding and Sale of a Portion of Shares. The Participant acknowledges and agrees that any income or other taxes due from the Participant with respect to the Shares issued pursuant to this Agreement, including on account of the vesting of the Shares, shall be the Participant’s responsibility. [In connection with the foregoing, the Participant agrees that the Company shall authorize a registered broker (the “Broker”) to sell, on the next trading day after the lapse of the Company’s lapsing repurchase right, that number of Shares as the Company instructs the Broker to sell solely to satisfy the Company’s tax withholding obligations, after deduction of the Broker’s commission, and the Broker shall remit to the Company the cash necessary in order for the Company to satisfy its withholding obligation, provided, however, that the Company shall not authorize any such sale if the Participant shall have issued a binding instruction (the “Instruction”) to the Company, in form satisfactory to the Company, which instruction may be delivered at any time prior to the 30^th day after the date of grant of the Shares, that provides that the Company shall not instruct the Broker to sell such Shares. Any such Instruction shall include an undertaking by the Participant to pay the Company the amount of any tax withholding in accordance with the Company’s policies then in effect. The Participant agrees to pay to the Company as soon as practicable, including through payroll, the amount of any tax withholding, that is for whatever reason, not satisfied by such Broker’s sale. The Participant acknowledges that this Section 6 is intended to comply with Section 10b5-1(c)(1)(i)(B) under the Securities Exchange Act of 1934, as amended, and that the delivery of the Shares shall be made by the Company after satisfaction of the tax withholding payments as set forth in Section 8 of this Agreement. The Participant agrees to hold the Company and the Broker harmless from all costs, damages or expenses relating to any such sale, and

acknowledges that the Company and the Broker are under no obligation to arrange for such sale at any particular price. The Participant further acknowledges that the grant of Shares made hereunder is subject to Participant’s acceptance of the terms of this Section 6, and other terms and provisions of this Agreement.](2)

7.Restrictions on Transfer. Except as provided in Section 10 of the Plan, the Shares may not be sold, transferred, assigned, hypothecated, pledged, encumbered or otherwise disposed of, whether voluntarily or by operation of law, at any time before they become vested Shares pursuant to Section 5 of this Agreement. Any such purported transfer shall be null and void, and shall not be recognized by the Company or recorded on its books.

8.Escrow. All Shares that have not vested pursuant to Section 5 of this Agreement, together with any securities distributed in respect thereof, such as through a stock split or other recapitalization, shall be held by the Company in escrow until such Shares shall have vested and the deposit required for tax withholding has been made pursuant to Section 6 of this Agreement. The Company promptly shall release vested Shares from escrow upon satisfaction of the foregoing conditions.

9.Plan. The Participant hereby acknowledges receipt of a copy of the Plan as presently in effect and the Prospectus with respect thereto. All of the terms and provisions of the Plan are incorporated herein by reference, and this Restricted Stock Award is subject to those terms and provisions in all respects.

VERTEX PHARMACEUTICALS INCORPORATED

By: ___________________________

--------------------

(1) Applicable to grants made on or after February 5, 2014.

(2) For Section 16 Officers, replace bracketed language with the following: “By accepting this Agreement, the Participant agrees and acknowledges that (i) the Company promptly will withhold from the Participant's pay the amount of taxes the Company is required to withhold upon any vesting of Shares pursuant to this Agreement, and (ii) the Participant shall make immediate payment to the Company in the amount of any tax required to be withheld by the Company in excess of the Participant's pay available for such withholding.”

EX-10.26

Exhibit 10.26

VERTEX PHARMACEUTICALS INCORPORATED

AMENDED AND RESTATED 2006 STOCK AND OPTION PLAN

Form of Restricted Stock Unit Award

This Agreement sets forth the terms and conditions of a Restricted Stock Unit Award granted pursuant to the provisions of the Amended and Restated 2006 Stock and Option Plan (as it may be amended or restated, the “Plan”) of Vertex Pharmaceuticals Incorporated (the “Company”) to the Participant whose name appears below, of a contingent entitlement of the Participant to receive the number of Shares of Common Stock of the Company set forth below, pursuant to the provisions of the Plan and on the following express terms and conditions. Capitalized terms not otherwise defined herein shall have the same meanings as set forth in the Plan, and any Restricted Stock Units evidenced hereby are granted subject to the terms of the Plan.

1.Name and address of Participant to whom the Restricted Stock Unit Award is granted:

[INSERT NAME/ADDRESS]

2.Number of Shares of Common Stock in the Restricted Stock Unit Award (the “Shares”):

[_____]

3.Purchase price of Shares upon Vesting:

[_____]

4.Date of grant of the Restricted Stock Unit Award:

[_____]

5.Vesting.

5.1Vesting Schedule. [INSERT VESTING SCHEDULE]. On each vesting date described in the preceding sentence, the Participant shall be entitled to receive at the purchase price, the applicable number of shares of Common Stock that shall thereafter be delivered by the Company to the Participant in accordance with this Agreement and the Plan within thirty days of the applicable vesting date. Except as provided in Section 5.4 of this Agreement, upon any Termination of Service of the Participant for any reason, vesting of the Shares shall immediately cease, and the unvested portion of the Restricted Stock Unit Award shall immediately be forfeited.

5.2Death of the Participant. If the Participant dies while an Employee, Non-Employee Director, consultant or advisor of the Company or an Affiliate, the vesting of all unvested Shares subject to this Restricted Stock Unit Award shall be accelerated and shall vest on the date of death of the Participant.

5.3 Termination for Cause.

(a)If the Participant is notified that the Company is investigating or evaluating whether the Company will terminate Participant’s employment or other service to the Company for Cause, the Company may, at its election, suspend the vesting of this Restricted Stock Unit Award by written notice to the Participant. If after such notification it is determined or otherwise agreed that Participant’s service to the Company will not be terminated for Cause, vesting of the Shares shall resume pursuant to the original schedule and any Shares that would have vested during such suspension immediately shall vest.

(b)“Cause” shall mean (i) the Participant’s dishonesty or fraud, or (ii) the willful misconduct by the Participant or willful failure by the Participant to perform his or her responsibilities to the Company (including, without limitation, any material breach by the Participant of any provision of any Company policy or any employment, consulting, advisory, nondisclosure, non-competition or other similar agreement between the Participant and the Company), in each case as determined in good faith by the Company, which determination shall be conclusive; provided, however, that if there is a conflict between this definition of Cause and either (1) the definition of “Cause” contained in any employment agreement between the Company and the Participant or (2) the definition of “Cause” contained in any change-of-control agreement between the Company and the Participant, then such other definition shall be controlling for purposes of this Agreement.

[5.4Career Employment Provision. If a Participant experiences a Termination of Service other than for Cause, and the Participant is a Qualified Participant (as defined below), then (a) an additional number of Shares equal to (i) the sum of 50% plus 10% for each full year of service as an Employee to the Company or an Affiliate in excess of five (5) full years of service multiplied by (ii) the number of unvested Shares subject to this Restricted Stock Unit Award immediately prior to the Participant’s Termination of Service, shall vest on the date of the Termination of Service and (b) any remaining unvested Shares shall be forfeited. A “Qualified Participant” shall mean a Participant (A) who is at least fifty-five (55) years old, (B) who has completed at least five (5) full years of service as an Employee to the Company or an Affiliate, (C) whose age plus full years of service to the Company is 65 or greater and (D) who has completed a transitional period of employment with the Company following notice of the Termination of Service, the duration of which will be determined by the Company but in no event will exceed six (6) months, except as may be required by applicable law.](1)

6.Agreement with respect to Tax Payments, Withholding and Sale of a Portion of Shares. The Participant acknowledges and agrees that any income or other taxes, fees or social security or comparable contributions due from the Participant with respect to the vesting of the Restricted Stock Unit Award or the issuance of Shares pursuant to this Agreement shall be the Participant’s responsibility. In connection with the foregoing, the Participant agrees that the Company shall authorize a registered broker (the “Broker”) to sell, on the next trading day after the date of vesting of any portion of the Restricted Stock Unit Award, that number of Shares as the Company instructs the Broker to sell solely to satisfy the Company’s tax withholding obligations, after deduction of the Broker’s commission, and the Broker shall remit to the Company the cash necessary in order for the Company to satisfy its withholding obligation, provided, however, that the Company shall not authorize any such sale if the Participant shall have issued a binding instruction (the “Instruction”) to the Company, in form satisfactory to the Company, which instruction may be delivered at any time prior to the 30^th day after the date of grant of the Restricted Stock Unit Award, that provides that the Company shall not instruct the Broker to sell such Shares. Any such Instruction shall include an undertaking by the Participant to pay the Company the amount of any tax withholding in accordance with the Company’s policies then in effect. The Participant agrees to pay to the Company as soon as practicable, including through payroll, the amount of any tax withholding, that is for whatever reason, not satisfied by such Broker’s sale. The Participant acknowledges that this Section 6 is intended to comply with Section 10b5-1(c)(1)(i)(B) under the Securities Exchange Act of 1934, as amended, and that the delivery of the Shares shall be made by the Company after satisfaction of the tax withholding payments as set forth herein. The Participant agrees to hold the Company and the Broker harmless from all costs, damages or expenses relating to any such sale, and acknowledges that the Company and the Broker are under no obligation to arrange for such sale at any particular price. The Participant further acknowledges that the Restricted Stock Unit Award made hereunder is subject to Participant’s acceptance of the terms of this Section 6, and other terms and provisions of this Agreement.

7.Restrictions on Transfer. Except as provided in Section 10 of the Plan, this Restricted Stock Unit Award may not be sold, transferred, assigned, hypothecated, pledged, encumbered or otherwise disposed of, whether voluntarily or by operation of law, at any time before the Participant receives Shares. Any such purported transfer shall be null and void, and shall not be recognized by the Company or recorded on its books.

8.No Rights as a Shareholder Until Exercise. The Participant shall have no rights as a shareholder, including voting and dividend rights, with respect to the Restricted Stock Unit Award subject to this Agreement.

9.No Obligation to Maintain Relationship. The Participant acknowledges that: (i) the Company is not by the Plan or this Restricted Stock Unit Award obligated to continue the Participant as an Employee, Non-Employee Director, consultant or advisor of the Company or an Affiliate; (ii) the Plan is discretionary in nature and may be modified, suspended or terminated by the Company at any time; (iii) the grant of the Restricted Stock Unit Award is a one-time benefit that does not create any contractual or other right to receive future grants of equity, or benefits in lieu thereof; (iv) all determinations with respect to any such future grants, including, but not limited to, the times when awards shall be granted, the number of shares subject to each restricted stock unit award, and the time or times when each award shall vest, will be at the sole discretion of the Company; (v) the Participant’s participation in the Plan is voluntary; (vi) the value of the Restricted Stock Unit Award is an extraordinary item of compensation which is outside the scope of the Participant’s employment or consulting contract, if any; and (vii) the Restricted Stock Unit Award is not part of normal or expected compensation for purposes of calculating any severance, resignation, redundancy, end of service payments, bonuses, long-service awards, pension or retirement benefits or similar payments.

10.Plan. The Participant hereby acknowledges receipt of a copy of the Plan as presently in effect and the Prospectus with respect thereto. All of the terms and provisions of the Plan are incorporated herein by reference, and this Restricted Stock Unit Award is subject to those terms and provisions in all respects.

11.Data Privacy. By entering into this Agreement, the Participant: (i) consents to the collection, use and disclosure of personal information (which may include name, home and business contact information, personal identifiers such a date of birth and the social insurance number for tax reporting purposes, employment, position and compensation) by the Company for the purpose of administering the Plan, providing Plan recordkeeping services and facilitating the grant of options; (ii) consents to the disclosure of this information by the Company to any Affiliate of the Company for such purposes; and (iii) authorizes the Company and each Affiliate to store and transmit such information in electronic form. Some of these Affiliates are located in, and the Plan will be administered (in whole or in part) in, the United States and some or all of the personal information may become subject to the laws of, and accessible to, the authorities of the United States. The file containing the Participant’s personal information will be kept at the offices of the Company or on its servers or those of its Affiliates and service providers, and only employees of the Company, its Affiliates or service providers who require it for the purposes of their duties will have access to this file. The Participant may request access to this file and the correction of inaccurate information, to the extent provided by law, by contacting •.

12. International Employees. This Restricted Stock Unit Award shall be subject to the additional terms and provisions, if any, applicable to the Participant as are set forth on an Exhibit A to this Agreement, which terms and conditions are incorporated herein by reference.

VERTEX PHARMACEUTICALS INCORPORATED

By:__________________________

--------------------

(1) Applicable to grants made on or after February 5, 2014.

EX-10.40

Exhibit 10.40

Vertex Employee Compensation Plan

On an annual basis in the first quarter of the fiscal year the Management Development and Compensation Committee of our Board of Directors adopts an employee compensation plan for our officers and other employees, including our named executive officers, together with performance goals for that fiscal year. The plan addresses three components of employee compensation—base salary, performance bonuses which serve as short-term incentives and equity grants which serve as long-term incentives—that are designed to motivate, reward and retain employees by aligning compensation with the achievement of strategic corporate goals.

Upon completion of each performance period (usually a calendar year), our Board of Directors assigns a performance rating on the basis of achievement of goals for the company set by the Board, in consultation with our chief executive officer, early in the performance period. The amount available for payment of performance bonuses is established on the basis of this performance rating, and is allocated to employees on the basis of salary tier and individual performance rating. The base salaries of the executive officers are set based on market and other competitive factors. Merit increases to base salaries for other employees are made on the basis of individual performance rating. Annual equity grants, made in the form of stock options, restricted stock grants or units, or a combination of both are made on the basis of salary tier and individual performance.

The Board of Directors retains broad discretion to determine the appropriate form and level of compensation, particularly for our executives, on the basis of its assessment of our executives, the demand for talent, our performance and other factors. Key corporate performance factors generally include, among other things, achievement of regulatory and commercialization goals, research and development productivity, enhancements of organizational capabilities, maintenance of financial stability and other aspects of our performance. We reserve the right to modify the plan, and the key corporate performance factors and criteria under the plan, at any time.

On February 5, 2014, the Board of Directors determined the cash bonus awards related to the fiscal year ended December 31, 2013 and annual salaries effective February 2014.

EX-21.1

Exhibit 21.1

Subsidiaries of Vertex Pharmaceuticals Incorporated

Vertex Pharmaceuticals (San Diego) LLC, a Delaware limited liability company

Vertex Securities Corporation, a Massachusetts corporation

Vertex Pharmaceuticals (Distribution) Incorporated, a Delaware corporation

Vertex Pharmaceuticals (Cayman) Limited, a Cayman Islands company

Vertex Pharmaceuticals (Cayman 509) Limited, a Cayman Islands company

Vertex Pharmaceuticals (Cayman 661) Limited, a Cayman Islands company

Vertex Pharmaceuticals (Cayman 765) Limited, a Cayman Islands company

Vertex Pharmaceuticals (Cayman 787) Limited, a Cayman Islands company

Vertex Pharmaceuticals (Delaware) LLC, a Delaware limited liability company

Vertex Pharmaceuticals (Canada) Incorporated, a Canadian company (1)

Vertex Pharmaceuticals (Singapore) Pte. Ltd., a Singapore company

Vertex Pharmaceuticals R&D (Shanghai) Co., Ltd. (2)

Vertex Holdings, Inc., a Delaware corporation

Vertex Pharmaceuticals (Europe) Limited, a United Kingdom company (3)

Vertex Pharmaceuticals (Switzerland) Sàrl, a Swiss company

Vertex Pharmaceuticals (Ireland) Limited, an Irish company (4)

Vertex Pharmaceuticals (U.K.) Limited, a United Kingdom company

Vertex Pharmaceuticals (France) SAS, a French company

Vertex Pharmaceuticals (Germany) GmbH, a German company

Vertex Pharmaceuticals (Australia) Pty. Ltd., an Australian company

Vertex Pharmaceuticals (Spain), S.L., a Spanish company

Vertex Pharmaceuticals (Netherlands) B.V., a Dutch company

Vertex Pharmaceuticals (Italy) S.r.L., an Italian company

------------------------------

(1) a subsidiary of Vertex Pharmaceuticals (Delaware) LLC

(2) a subsidiary of Vertex Pharmaceuticals (Singapore) Pte. Ltd.

(3) a subsidiary of Vertex Holdings, Inc.

(4) a subsidiary of Vertex Pharmaceuticals (Switzerland) Sàrl

EX-23.1

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

        We consent to the incorporation by reference in the Registration Statements (Form S-3 No. 333-186993 and Form S-8 Nos. 333-65666, 333-134482, 333-150945, 333-150946, 333-160442, 333-166803, 333-184784, 333-184787 and 333-188737) of Vertex Pharmaceuticals Incorporated of our reports dated February 11, 2014, with respect to the consolidated financial statements of Vertex Pharmaceuticals Incorporated and the effectiveness of internal control over financial reporting of Vertex Pharmaceuticals Incorporated, included in this Annual Report (Form 10-K) for the year ended December 31, 2013.

/s/ Ernst & Young LLP

Boston, Massachusetts

February 11, 2014

EX-31.1

Exhibit 31.1

CERTIFICATION

I, Jeffrey M. Leiden, certify that:

1. I have reviewed this Annual Report on Form 10-K of Vertex Pharmaceuticals Incorporated;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	February 11, 2014	/s/ Jeffrey M. Leiden
		Jeffrey M. Leiden
		Chief Executive Officer and President

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Ian F. Smith, certify that:

1. I have reviewed this Annual Report on Form 10-K of Vertex Pharmaceuticals Incorporated;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a) All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b) Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	February 11, 2014	/s/ Ian F. Smith
		Ian F. Smith
		Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

SECTION 906 CEO/CFO CERTIFICATION

Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (Subsections (a) and (b) of Section 1350, Chapter 63 of Title 18, United States Code) each of the undersigned officers of Vertex Pharmaceuticals Incorporated, a Massachusetts corporation (the “Company”), does hereby certify, to such officer’s knowledge, that:

The Annual Report on Form 10-K for the year ended December 31, 2013 (the “Form 10-K”) of the Company fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934, and the information contained in the Form 10-K fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date:	February 11, 2014
		/s/ Jeffrey M. Leiden
		Jeffrey M. Leiden
		Chief Executive Officer and President
Date:	February 11, 2014
		/s/ Ian F. Smith
		Ian F. Smith
		Executive Vice President and Chief Financial Officer

A signed original of this written statement required by Section 906 has been provided to the Company and will be retained by the Company and furnished to the Securities and Exchange Commission or its staff upon request.

XML

Accumulated Other Comprehensive Loss (Tables)

12 Months Ended

Dec. 31, 2013

Equity [Abstract]

Reclassifications out of Accumulated Other Comprehensive Income

The following table summarizes the changes in accumulated other comprehensive loss by component:

	Foreign currency translation adjustment			Unrealized holding gains on marketable securities			Unrealized losses on foreign currency forward contracts			Total
	(in thousands)
Balance at December 31, 2012	$	(746	)	$	196		$	—		$	(550	)
Other comprehensive income (loss) before reclassifications	421			(154		)	(23		)	244
Amounts reclassified from accumulated other comprehensive loss	—			—			—			—
Net current period other comprehensive income (loss)	421			(154		)	(23		)	244
Balance at December 31, 2013	$	(325	)	$	42		$	(23	)	$	(306	)

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Nature of Business and Accounting Policies (Details 3) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Foreign Currency Translation
Foreign currency translation adjustment, net of tax	$ (0.3)	$ (0.7)	$ (0.9)
Foreign currency transaction gain (loss), before tax	$ 5.1	$ (0.4)	$ 0.7
Building
Property and Equipment
Property and equipment useful life	40 years
Minimum | Furniture and equipment
Property and Equipment
Property and equipment useful life	7 years
Minimum | Computers and software
Property and Equipment
Property and equipment useful life	3 years
Maximum | Furniture and equipment
Property and Equipment
Property and equipment useful life	10 years
Maximum | Computers and software
Property and Equipment
Property and equipment useful life	5 years

XML

Employee Benefits (Tables)

12 Months Ended

Dec. 31, 2013

Compensation and Retirement Disclosure [Abstract]

Matching contributions to the Vertex 401(k) Plan

The Company declared matching contributions paid in fully-vested interests in the Vertex common stock fund to the Vertex 401(k) Plan as follows:

	2013		2012		2011
	(in thousands)
Discretionary matching contributions during the year ended December 31,	$	5,930	$	10,261	$	8,619
Shares issued during the year ended December 31,	99		242		183
Shares issuable as of the year ended December 31,	0		53		62

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Stock-based Compensation Expense (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock-based compensation expense:
Total stock-based compensation expense included in costs and expenses	$ 127,303,000	$ 114,285,000	$ 118,226,000
Less: stock-based compensation expense capitalized to inventories	(1,048,000)	(1,254,000)	(1,042,000)
Weighted-average assumptions for options and ESPP subscriptions granted
Weighted average fair value (in dollars per share)	$ 62.16
Stock Options
Weighted-average assumptions for options and ESPP subscriptions granted
Expected annual dividends	0
Employee Stock Purchase Plan
Weighted-average assumptions for options and ESPP subscriptions granted
Expected stock price volatility (as a percent)	54.69%	46.90%	51.32%
Risk-free interest rate (as a percent)	0.08%	0.16%	0.08%
Expected term of options (in years)	8 months 27 days	8 months 27 days	8 months 19 days
Expected annual dividends	0	0	0
Weighted average fair value (in dollars per share)	$ 21.08	$ 12.90	$ 9.80
Stock options
Stock-based compensation expense:
Total stock-based compensation expense included in costs and expenses	85,067,000	79,047,000	83,098,000
Type of award:
Unrecognized Expense Net of Estimated Forfeitures	141,283,000
Weighted-average Recognition Period (in years)	2 years 6 months 22 days
Weighted-average grant-date fair value, granted (in dollars per share)	$ 25.79	$ 19.72	$ 20.88
Weighted-average assumptions for options and ESPP subscriptions granted
Expected stock price volatility (as a percent)	46.20%	47.93%	49.53%
Risk-free interest rate (as a percent)	1.25%	0.95%	2.09%
Expected term of options (in years)	5 years 9 months 22 days	5 years 9 months 11 days	5 years 8 months 27 days
Expected annual dividends	0	0	0
Restricted stock and restricted stock units
Stock-based compensation expense:
Total stock-based compensation expense included in costs and expenses	36,479,000	29,194,000	30,708,000
Type of award:
Unrecognized Expense Net of Estimated Forfeitures	73,490,000
Weighted-average Recognition Period (in years)	2 years 5 months 19 days
ESPP share issuances
Stock-based compensation expense:
Total stock-based compensation expense included in costs and expenses	6,805,000	7,298,000	5,462,000
Type of award:
Unrecognized Expense Net of Estimated Forfeitures	5,956,000
Weighted-average Recognition Period (in years)	8 months 1 day
Research and development expenses
Stock-based compensation expense:
Total stock-based compensation expense included in costs and expenses	81,467,000	71,533,000	75,574,000
Sales, general and administrative expenses
Stock-based compensation expense:
Total stock-based compensation expense included in costs and expenses	$ 45,836,000	$ 42,752,000	$ 42,652,000

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Collaborative Arrangements (Details) (USD $)	3 Months Ended										12 Months Ended					3 Months Ended			12 Months Ended				3 Months Ended		12 Months Ended		1 Months Ended	12 Months Ended				1 Months Ended	12 Months Ended			3 Months Ended	12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2013 Janssen	Sep. 30, 2011 Janssen	Mar. 31, 2011 Janssen	Dec. 31, 2013 Janssen	Dec. 31, 2012 Janssen	Dec. 31, 2011 Janssen	Dec. 31, 2006 Janssen	Dec. 31, 2011 Bupa Home Healthcare Limited	Sep. 30, 2009 Bupa Home Healthcare Limited	Dec. 31, 2012 Bupa Home Healthcare Limited	Dec. 31, 2011 Bupa Home Healthcare Limited	Apr. 30, 2011 Cystic Fibrosis Foundation Therapeutics Incorporated	Dec. 31, 2013 Cystic Fibrosis Foundation Therapeutics Incorporated payment	Dec. 31, 2012 Cystic Fibrosis Foundation Therapeutics Incorporated	Dec. 31, 2011 Cystic Fibrosis Foundation Therapeutics Incorporated	Dec. 31, 2006 Cystic Fibrosis Foundation Therapeutics Incorporated	Jun. 30, 2011 Alios BioPharma, Inc	Dec. 31, 2013 Alios BioPharma, Inc lines	Dec. 31, 2012 Alios BioPharma, Inc	Dec. 31, 2011 Alios BioPharma, Inc	Dec. 31, 2013 Research and Development Arrangement Alios BioPharma, Inc	Dec. 31, 2013 Research and Development Arrangement Alios BioPharma, Inc
Schedule of Collaborative Arrangements
Drug development costs to be paid by collaborator (as a percent)																			50.00%
Tiered royalty average range, as a percentage of net sales in the Janssen territories																			20.00%
Up-front license payment																						$ 165,000,000
Deferred revenue related to up-front license payment																5,000,000			5,000,000	32,100,000
Total contingent milestone payments earned																			350,000,000
Milestone payment earned pursuant to the collaborative agreement																	200,000,000	50,000,000
Royalty revenues	36,887,000		27,012,000	49,120,000	43,573,000	43,451,000		25,586,000	33,480,000	38,981,000	156,592,000		141,498,000		50,015,000				130,724,000	117,592,000	20,289,000
Collaborative revenues:
Up-front and amendment payments revenues																			190,345,000	12,428,000	12,428,000				12,744,000	38,232,000
Milestone revenues																			0	0	250,000,000				485,000	68,515,000		9,300,000					60,000,000
Net reimbursement (payment) for telaprevir development costs																			2,793,000	(3,507,000)	(8,418,000)
Reimbursement for manufacturing services																			10,299,000	7,257,000	20,383,000				5,650,000	14,928,000
Collaborative revenues	185,448,000		8,035,000	6,841,000	17,414,000	9,234,000		6,919,000	11,552,000	24,381,000	217,738,000		52,086,000		409,722,000	182,400,000			203,437,000	16,178,000	274,393,000				18,879,000	121,675,000		14,300,000	17,000,000	13,700,000
Total revenues	351,157,000		221,700,000	310,750,000	328,368,000	333,994,000		336,006,000	418,305,000	438,737,000	1,211,975,000		1,527,042,000		1,410,626,000				334,161,000	133,770,000	294,682,000
License fee paid upon amendment of agreement																152,000,000								105,000,000
Milestone payment received																							65,000,000								1,500,000
Deferred revenue related to up-front license payment																5,000,000			5,000,000	32,100,000
Collaborative funding																											75,000,000
Number of years over which funding will be made (in years)																											5 years
Number of commercial milestone payments for achievement of certain sales levels for corrector compound such as VX-809 or VX-661 (in payments)																												2
Up-front payment																																60,000,000
Milestone payments																			0	0	250,000,000				485,000	68,515,000		9,300,000					60,000,000
Development milestone payments, maximum																																	312,500,000
Commercial milestone payments, maximum																																750,000,000
Notice period for termination of contract due to technical failure (in days)																																30 days
Notice period for termination of contract after completion of clinical trials (in days)																																60 days
Latest expiration period for royalty obligation after first commercial sale in country unless contract is terminated earlier (in years)																																10 years
Intangible asset impairment charges	250,600,000		0	0	412,900,000	0		0	0	0	663,500,000		0		105,800,000																					250,600,000	250,600,000
Change in deferred income taxes																																					102,100,000
Deconsolidation, Gain (Loss), Amount																																					68,200,000
Collaborative Arrangements, Upfront License Fees and Milestone Payments																																					120,000,000
Noncontrolling Interest (Alios)
Number of lines on balance sheet where noncontrolling interest is reported (lines)																																	2
Loss before provision for (benefit from) income taxes																																	283,747,000	20,044,000	9,536,000
Decrease (increase) in fair value of contingent milestone and royalty payments																																	124,920,000	(114,970,000)	(69,950,000)
Provision for (benefit from) income taxes	(155,704,000)		(751,000)	(1,799,000)	(130,313,000)	(2,696,000)		21,355,000	20,063,000	32,000	(288,567,000)		38,754,000		19,266,000																		(166,145,000)	39,029,000	48,809,000
Net loss (income) attributable to noncontrolling interest (Alios)	(228,834,000)		(4,530,000)	(4,547,000)	(4,611,000)	(1,928,000)		31,076,000	30,463,000	(3,714,000)	(242,522,000)		55,897,000		11,605,000																		242,522,000	(55,897,000)	(11,605,000)
Restricted cash and cash equivalents (Alios)	0	[1]				69,983,000	[1]				0	[1]	69,983,000	[1]																				69,983,000
Prepaid expenses and other current assets	23,836,000	[1]				24,673,000	[1]				23,836,000	[1]	24,673,000	[1]																				672,000
Property and equipment, net	696,911,000	[1]				433,609,000	[1]				696,911,000	[1]	433,609,000	[1]																				1,728,000
Intangible assets																																		250,600,000	250,600,000
Other assets	2,432,000	[1]				9,668,000	[1]				2,432,000	[1]	9,668,000	[1]																				861,000
Accounts payable	49,327,000	[1]				101,292,000	[1]				49,327,000	[1]	101,292,000	[1]																				1,054,000
Accrued expenses	271,077,000	[1]				264,884,000	[1]				271,077,000	[1]	264,884,000	[1]																				6,099,000
Income taxes payable (Alios)	0	[1]				715,000	[1]				0	[1]	715,000	[1]																				715,000
Deferred tax liability	0	[1]				280,367,000	[1]				0	[1]	280,367,000	[1]																				152,781,000
Other liabilities, excluding current portion	11,590,000	[1]				13,902,000	[1]				11,590,000	[1]	13,902,000	[1]																				910,000
Redeemable noncontrolling interest (Alios)	0	[1]				38,530,000	[1]				0	[1]	38,530,000	[1]																				38,530,000
Noncontrolling interest (Alios)	0	[1]				196,672,000	[1]				0	[1]	196,672,000	[1]																				196,672,000
Collaborative revenues	$ 185,448,000		$ 8,035,000	$ 6,841,000	$ 17,414,000	$ 9,234,000		$ 6,919,000	$ 11,552,000	$ 24,381,000	$ 217,738,000		$ 52,086,000		$ 409,722,000	$ 182,400,000			$ 203,437,000	$ 16,178,000	$ 274,393,000				$ 18,879,000	$ 121,675,000		$ 14,300,000	$ 17,000,000	$ 13,700,000

[1] Amounts as of December 31, 2012 include the assets and liabilities of Vertex’s variable interest entity (“VIE”), Alios BioPharma, Inc. (“Alios”). The Company deconsolidated Alios as of December 31, 2013. Vertex’s interests and obligations with respect to the VIE’s assets and liabilities are limited to those accorded to Vertex in its agreement with Alios. See Note B, "Collaborative Arrangements," to these consolidated financial statements for amounts.

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Employee Benefits (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Compensation and Retirement Disclosure [Abstract]
Compensation and Employee Benefit Plans [Text Block]	$ 2,400,000
Maximum percentage of annual compensation contributed by the participant (as a percent)	60.00%
Common stock shares remained available for grant (shares)	755,000
Matching contributions to the Vertex 401(k) Plan:
Discretionary matching contributions during the year ended December 31,	5,930,000	10,261,000	8,619,000
Shares issued during the year ended December 31 (shares)	99,000	242,000	183,000
Shares issuable as of the year ended December 31 (shares)	0	53,000	62,000
Contributions by employer	$ 5,000,000

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Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Schedule of components of income (loss) before provision for (benefit from) income taxes

The components of income (loss) before provision for (benefit from) income taxes during the three years ended December 31, 2013 consisted of the following:

	2013			2012			2011
	(in thousands)
United States	$	(390,009	)	$	256,816		$	343,515
Foreign	(586,108		)	(269,197		)	(283,070		)
Income (loss) before provision for (benefit from) income taxes	$	(976,117	)	$	(12,381	)	$	60,445

Schedule of components of provision for (benefit from) income taxes

The components of the provision for (benefit from) income taxes during the three years ended December 31, 2013 consisted of the following:

	2013			2012			2011
	(in thousands)
Current taxes:
United States	$	(11,420	)	$	2,057		$	22,275
Foreign	1,084			(1,865		)	(561		)
State	2,136			1,902			8,655
Total current taxes	$	(8,200	)	$	2,094		$	30,369
Deferred taxes:
United States	$	(131,281	)	$	31,308		$	19,629
Foreign	(127,587		)	—			(32,692		)
State	(21,499		)	5,352			1,960
Total deferred taxes	$	(280,367	)	$	36,660		$	(11,103	)
Provision for (benefit from) income taxes	$	(288,567	)	$	38,754		$	19,266

Reconciliation of the provision for (benefit from) income taxes

The difference between the Company’s “expected” tax provision (benefit), as computed by applying the U.S. federal corporate tax rate of 35% to income (loss) before provision for (benefit from) income taxes, and actual tax is reconciled as follows:

	2013			2012			2011
	(in thousands)
Income (loss) before provision for (benefit from) income taxes	$	(976,117	)	$	(12,381	)	$	60,445
Expected tax provision (benefit)	(341,641		)	(4,333		)	21,156
State taxes, net of federal benefit	(19,268		)	7,075			10,624
Foreign rate differential	72,961			62,425			43,629
Tax credits	(16,775		)	(1,980		)	(51,086		)
Unbenefited operating losses	(43,570		)	(30,364		)	(6,286		)
Non-deductible expenses	9,614			3,198			1,953
Rate change	50,076			3,275			—
Other	36			(542		)	(724		)
Provision for (benefit from) income taxes	$	(288,567	)	$	38,754		$	19,266

Schedule of unrecognized tax benefits

Unrecognized tax benefits during the two years ended December 31, 2013 consisted of the following:

	2013			2012
	(in thousands)
Unrecognized tax benefits beginning of year	$	4,106		$	4,360
Gross change for current year positions	1,325			598
Increase for prior period positions	—			—
Decrease for prior period positions	(290		)	—
Decrease due to settlements and payments	—			—
Decrease due to statute limitations	(185		)	(852		)
Deconsolidation of Alios	(2,932		)	—
Unrecognized tax benefits end of year	$	2,024		$	4,106

Schedule of deferred tax assets and liabilities

Deferred tax assets and liabilities are determined based on the difference between financial statement and tax bases using enacted tax rates in effect for the year in which the differences are expected to reverse. The components of the deferred taxes were as follows:

	As of December 31,
	2013			2012
	(in thousands)
Deferred tax assets:
Net operating loss	$	850,946		$	777,687
Tax credit carryforwards	180,380			147,074
Property and equipment	—			10,701
Intangible assets	26,105			63,353
Deferred revenues	25,158			44,867
Stock-based compensation	63,521			83,979
Inventories	26,278			56,564
Accrued expenses	52,470			27,945
Currency translation adjustment	217			—
Construction financing lease obligation	152,688			—
Gross deferred tax assets	1,377,763			1,212,170
Valuation allowance	(1,243,664		)	(1,211,561		)
Total deferred tax assets	134,099			609
Deferred tax liabilities:
Property and equipment	(134,099		)	—
Unrealized gain	—			(376		)
Contingent milestone and royalty payment obligation	—			(50,904		)
Acquired intangibles	—			(229,696		)
Net deferred tax liabilities	$	—		$	(280,367	)

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Nature of Business and Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Basis of Presentation

Basis of Presentation

The consolidated financial statements reflect the operations of (i) the Company and (ii) its wholly-owned subsidiaries. In addition, the consolidated financial statements for the period from June 13, 2011 through December 31, 2013, reflect the operations of Alios BioPharma, Inc. (“Alios”), a collaborator that is a variable interest entity (a “VIE”) for which the Company was deemed under applicable accounting guidance to have a variable interest and be the primary beneficiary. As of December 31, 2013, the Company deconsolidated Alios, and the Company's consolidated balance sheet as of December 31, 2013 excludes Alios. All material intercompany balances and transactions have been eliminated. The Company operates in one segment, pharmaceuticals. Please refer to Note X, "Segment Information," for enterprise-wide disclosures regarding the Company’s revenues, major customers and long-lived assets by geographic area.

Use of Estimates

Use of Estimates

The preparation of consolidated financial statements in accordance with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and the amounts of revenues and expenses during the reported periods. Significant estimates in these consolidated financial statements have been made in connection with the calculation of revenues, inventories, research and development expenses, stock-based compensation expense, restructuring expense, the fair value of intangible assets, noncontrolling interest (Alios), the consolidation and deconsolidation of a VIE, leases and the income tax provision. The Company bases its estimates on historical experience and various other assumptions, including in certain circumstances future projections, that management believes to be reasonable under the circumstances. Actual results could differ from those estimates. Changes in estimates are reflected in reported results in the period in which they become known.

Revenue Recognition

Revenue Recognition

Product Revenues, Net

The Company sells its products principally to a limited number of major and selected regional wholesalers and specialty pharmacy providers in North America as well as government-owned and supported customers in Europe (collectively, its “Customers”). The Company's Customers in North America subsequently resell the products to patients and health care providers. The Company recognizes net revenues from product sales upon delivery as long as (i) there is persuasive evidence that an arrangement exists between the Company and the Customer, (ii) collectibility is reasonably assured and (iii) the price is fixed or determinable.

In order to conclude that the price is fixed or determinable, the Company must be able to (i) calculate its gross product revenues from sales to Customers and (ii) reasonably estimate its net product revenues upon delivery to its Customer's locations. The Company calculates gross product revenues based on the price that the Company charges its Customers. The Company estimates its net product revenues by deducting from its gross product revenues (a) trade allowances, such as invoice discounts for prompt payment and Customer fees, (b) estimated government and private payor rebates, chargebacks and discounts, (c) estimated reserves for expected product returns and (d) estimated costs of incentives offered to certain indirect customers, including patients.

The Company makes significant estimates and judgments that materially affect the Company’s recognition of net product revenues. In certain instances, the Company may be unable to reasonably conclude that the price is fixed or determinable at the time of delivery, in which case it defers the recognition of revenues. Once the Company is able to determine that the price is fixed or determinable, it recognizes the revenues associated with the units in which revenue recognition was deferred.

Trade Allowances: The Company generally provides invoice discounts on product sales to its Customers for prompt payment and pays fees for distribution services, such as fees for certain data that Customers provide to the Company. The payment terms for sales to Customers in the United States generally include a 2% discount for payment within 30 days. The Company expects that, based on its experience, its Customers will earn these discounts and fees, and deducts the full amount of these discounts and fees from its gross product revenues and accounts receivable at the time such revenues are recognized.

Rebates, Chargebacks and Discounts: The Company contracts with government agencies and various private organizations (collectively, its “Third-party Payors”) so that products will be eligible for purchase by, or partial or full reimbursement from, such Third-party Payors. The Company estimates the rebates, chargebacks and discounts it will provide to Third-party Payors and deducts these estimated amounts from its gross product revenues at the time the revenues are recognized. For each product, the Company estimates the aggregate rebates, chargebacks and discounts that it will provide to Third-party Payors based upon (i) the Company’s contracts with these Third-party Payors, (ii) the government-mandated discounts applicable to government-funded programs, (iii) information obtained from the Company’s Customers regarding the payor mix for such product and (iv) historical experience.

Product Returns: The Company estimates the amount of each product that will be returned and deducts these estimated amounts from its gross revenues at the time the revenues are recognized. The Company’s Customers have the right to return unopened unprescribed packages, subject to contractual limitations. To date product returns have been minimal and, based on inventory levels held by its Customers and its distribution model, the Company believes that returns of its products will continue to be minimal.

Other Incentives: Other incentives that the Company offers include co-pay mitigation rebates provided by the Company to commercially insured patients who have coverage and who reside in states that permit co-pay mitigation programs. The Company’s co-pay mitigation programs are intended to reduce each participating patient’s portion of the financial responsibility for a product’s purchase price to a specified dollar amount. Based upon the terms of the Company's co-pay mitigation programs, the Company estimates average co-pay mitigation amounts for each of its products in order to establish its accruals for co-pay mitigation rebates and deducts these estimated amounts from its gross product revenues at the later of the date (i) the revenues are recognized or (ii) the incentive is offered. The Company’s co-pay mitigation rebates are subject to expiration.

The following table summarizes activity in each of the product revenue allowance and reserve categories for the three years ended December 31, 2013:

	Trade Allowances			Rebates, Chargebacks and Discounts			Product Returns			Other Incentives			Total
	(in thousands)
2013
Beginning Balance	$	5,416		$	63,560		$	2,852		$	3,565		$	75,393
Provision related to current period sales	31,395			204,459			5,795			9,295			250,944
Adjustments related to prior period sales	343			4,474			15,149			(228		)	19,738
Credits/payments made	(35,619		)	(204,249		)	(7,997		)	(11,077		)	(258,942		)
Ending Balance	$	1,535		$	68,244		$	15,799		$	1,555		$	87,133
2012
Beginning Balance	$	11,162		$	52,659		$	340		$	5,202		$	69,363
Provision related to current period sales	55,913			216,942			2,067			19,103			294,025
Adjustments related to prior period sales	29			3,883			1,498			72			5,482
Credits/payments made	(61,688		)	(209,924		)	(1,053		)	(20,812		)	(293,477		)
Ending Balance	$	5,416		$	63,560		$	2,852		$	3,565		$	75,393
2011
Beginning Balance	$	—		$	—		$	—		$	—		$	—
Provision related to current period sales	38,228			75,145			553			9,692			123,618
Credits/payments made	(27,066		)	(22,486		)	(213		)	(4,490		)	(54,255		)
Ending Balance	$	11,162		$	52,659		$	340		$	5,202		$	69,363

Based on the current information available to the Company, cumulative adjustments related to prior period sales represent 0.7% and 1.3%, respectively, of the gross product revenues that were recorded in the years ended December 31, 2012 and 2011.

Royalty Revenues

The Company’s royalty revenues on commercial sales of INCIVO (telaprevir) by Janssen are based on net sales of licensed products in licensed territories as provided by Janssen. The Company recognizes royalty revenues in the period the sales occur.

The Company has sold its rights to receive certain royalties on sales of an HIV protease inhibitor (fosamprenavir) and recognizes the revenues related to this sale as royalty revenues. In the circumstance where the Company has sold its rights to future royalties under a license agreement and also maintains continuing involvement in the royalty arrangement (but not significant continuing involvement in the generation of the cash flows payable to the purchaser of the future royalty rights), the Company defers recognition of the proceeds it receives for the royalty stream and recognizes these deferred revenues over the life of the license agreement pursuant to the units-of-revenue method. The Company’s estimates regarding the estimated remaining royalty payments due to the purchaser have changed in the past and may change in the future.

Collaborative Revenues

The Company recognizes revenues generated through collaborative research, development and/or commercialization agreements. The terms of these agreements typically include payment to the Company of one or more of the following: nonrefundable, up-front license fees; development and commercial milestone payments; funding of research and/or development activities; payments for services the Company provides through its third-party manufacturing network; and royalties on net sales of licensed products. Each of these types of payments results in collaborative revenues, except for revenues from royalties on net sales of licensed products, which are classified as royalty revenues.

For each collaborative research, development and/or commercialization agreement that result in revenues, the Company determines (i) whether multiple deliverables exist, (ii) whether the undelivered elements have value to the customer on a stand-alone basis, (iii) how the deliverables should be separated and (iv) how the consideration should be allocated to the deliverables. For arrangements entered into or materially modified after January 1, 2011, the Company allocates consideration in an arrangement using the relative selling price method based on management’s best estimate of selling price of deliverables if it does not have vendor-specific objective evidence or third-party evidence. As part of the accounting for these agreements, the Company must develop assumptions that require judgment to determine the best estimate of selling price. Key assumptions utilized by the Company to determine the best estimate of selling price may include patient enrollment requirements from regulatory authorities, development timelines, reimbursement rates for personnel costs, discount rates, and estimated third-party development costs.

The Company evaluates amendments to its existing arrangements to determine whether they have been materially modified. In making its determination that an arrangement has been materially modified, the Company considers whether there have been significant changes to the consideration under the arrangement, the deliverables under the arrangement, the timing of deliverables and the period of the arrangement. If the arrangement is determined to have been materially modified, the Company allocates fixed consideration under the arrangement using its best estimate of selling price to the remaining undelivered elements at the date of material modification. Any consideration remaining after the allocation is recognized as revenue.

Collaborative research, development and/or commercialization agreements entered into prior to January 1, 2011 that contained multiple elements of revenue were divided into separate units of accounting if certain criteria were met, including whether the delivered element had stand-alone value to the collaborator and whether there was objective and reliable evidence of the fair value of the undelivered obligation(s). The Company allocated consideration it received among the separate units either on the basis of each unit’s fair value or using the residual method, and applied the revenue recognition criteria to each of the separate units.

Up-front License Fees: If the license to the Company's intellectual property was determined to have stand-alone value from the other deliverables identified in the arrangement, the Company recognized revenues from nonrefundable, up-front license fees upon delivery. If these licenses did not have stand-alone value, the Company recognized revenues from nonrefundable, up-front license fees on a straight-line basis over the contracted or estimated period of performance. The Company evaluated the period of performance each reporting period and adjusted the period of performance on a prospective basis if there were changes to be made.

Milestone Payments: At the inception of each agreement that included research and development milestone payments, the Company evaluated whether each milestone was substantive. The Company recognized revenues related to substantive milestones in full in the period in which the substantive milestone was achieved if payment was reasonably assured. If a milestone was not considered substantive, the Company recognized the applicable milestone payment over the period of performance.

Research and Development Activities/Manufacturing Services: If the Company was entitled to reimbursement from its collaborators for specified research and development expenses and/or was entitled to payments for specified manufacturing services that the Company provided through its third-party manufacturing network, the Company determined whether the research and development funding would result in collaborative revenues or an offset to research and development expenses.

Concentration of Credit Risk

Concentration of Credit Risk

Financial instruments that potentially subject the Company to concentration of credit risk consist principally of money market funds and marketable securities. The Company places these investments with highly rated financial institutions, and, by policy, limits the amounts of credit exposure to any one financial institution. These amounts at times may exceed federally insured limits. The Company has not experienced any credit losses in these accounts and does not believe it is exposed to any significant credit risk on these funds. The Company implemented a foreign exchange hedging program in December 2013. As of December 31, 2013, the notional amount and fair value of these hedges was not significant.

The Company also is subject to credit risk from its accounts receivable related to its product sales and collaborators. The Company evaluates the creditworthiness of each of its customers and has determined that all of its material customers are creditworthy. To date, the Company has not experienced significant losses with respect to the collection of its accounts receivable. The Company's receivables from Greece and Italy were not material in 2013, and the Company had no receivables from Spain or Portugal in 2013. The Company believes that its allowance for doubtful accounts was adequate at December 31, 2013. Please refer to Note X, "Segment Information," for further information.

Cash and Cash Equivalents

Cash and Cash Equivalents

The Company considers all highly liquid investments with original maturities of three months or less at the date of purchase to be cash equivalents.

Restricted Cash

Restricted Cash

Restricted cash consists of balances held in deposit with certain banks to collateralize conditional stand-by letters of credit in the names of the Company’s landlords pursuant to certain operating lease agreements. The Company also separately disclosed on its consolidated balance sheet restricted cash and cash equivalents (Alios) as of December 31, 2012. The Company deconsolidated Alios as of December 31, 2013. Please refer to Note B, "Collaborative Arrangements," for further information.

Marketable Securities

Marketable Securities

The Company's marketable securities consist of investments in government-sponsored enterprise securities, corporate debt securities and commercial paper that are classified as available-for-sale. The Company classifies marketable securities available to fund current operations as current assets on its consolidated balance sheets. Marketable securities are classified as long-term assets on the consolidated balance sheets if (i) they have been in an unrealized loss position for longer than one year and (ii) the Company has the ability and intent to hold them (a) until the carrying value is recovered and (b) such holding period may be longer than one year. The Company's marketable securities are stated at fair value with their unrealized gains and losses included as a component of accumulated other comprehensive loss, which is a separate component of shareholders’ equity, until such gains and losses are realized. The fair value of these securities is based on quoted prices for identical or similar assets.

The Company reviews investments in marketable securities for other-than-temporary impairment whenever the fair value of an investment is less than the amortized cost and evidence indicates that an investment’s carrying amount is not recoverable within a reasonable period of time. To determine whether an impairment is other-than-temporary, the Company considers whether it has an intent to sell, or whether it is more likely than not that the Company will be required to sell, the investment before recovery of the investment’s amortized cost basis. Evidence considered in this assessment includes reasons for the impairment, compliance with the Company’s investment policy, the severity and the duration of the impairment and changes in value subsequent to year-end. If a decline in the fair value is considered other-than-temporary, based on available evidence, the unrealized loss is transferred from other comprehensive income (loss) to the consolidated statements of operations.

Stock-based Compensation Expense

Stock-based Compensation Expense

The Company expenses the fair value of employee stock options and other forms of stock-based employee compensation over the associated employee service period on a straight-line basis. For awards with performance conditions, the Company estimates the likelihood of satisfaction of the performance conditions, which affects the period over which the expense is recognized, and recognizes the expense using the accelerated attribution model. Stock-based compensation expense is determined based on the fair value of the award at the grant date, including estimated forfeitures, and is adjusted each period to reflect actual forfeitures and the outcomes of certain performance conditions.

Research and Development Expenses

Research and Development Expenses

The Company expenses as incurred all research and development expenses, including amounts funded by research and development collaborations. The Company capitalizes nonrefundable advance payments made by the Company for research and development activities and expenses the payments as the related goods are delivered or the related services are performed.

Research and development expenses are comprised of costs incurred by the Company in performing research and development activities, including salary and benefits; stock-based compensation expense; laboratory supplies and other direct expenses; contractual services costs, including clinical trial and pharmaceutical development costs; expenses associated with drug supplies that are not being capitalized; and infrastructure costs, including facilities costs and depreciation expense.

Advertising Expenses

Advertising Expenses

The Company expenses the costs of advertising, including promotional expenses, as incurred.

Inventories

Inventories

The Company values its inventories at the lower-of-cost or market. The Company determines the cost of its inventories, which includes amounts related to materials and manufacturing overhead, on a first-in, first-out basis. The Company performs an assessment of the recoverability of capitalized inventory during each reporting period, and writes down any excess and obsolete inventories to their realizable value in the period in which the impairment is first identified. Shipping and handling costs incurred for inventory purchases are capitalized and recorded upon sale in cost of product revenues in the consolidated statements of operations. Shipping and handling costs incurred for product shipments are recorded as incurred in cost of product revenues in the consolidated statements of operations.

The Company capitalizes inventories produced in preparation for initiating sales of a drug candidate when the related drug candidate is considered to have a high likelihood of regulatory approval and the related costs are expected to be recoverable through sales of the inventories. In determining whether or not to capitalize such inventories, the Company evaluates, among other factors, information regarding the drug candidate’s safety and efficacy, the status of regulatory submissions and communications with regulatory authorities and the outlook for commercial sales, including the existence of current or anticipated competitive drugs and the availability of reimbursement. In addition, the Company evaluates risks associated with manufacturing the drug candidate and the remaining shelf-life of the inventories.

Property and Equipment

Property and Equipment

Property and equipment are recorded at cost. Depreciation expense is recorded using the straight-line method over the estimated useful life of the related asset, generally seven to ten years for furniture and equipment, three to five years for computers and software, 40 years for buildings and for leasehold improvements, the useful life of the improvements or the estimated remaining life of the associated lease. Maintenance and repairs to an asset that do not improve or extend its life are charged to operations. When assets are retired or otherwise disposed of, the assets and related accumulated depreciation are eliminated from the accounts and any resulting gain or loss is reflected in the Company’s consolidated statements of operations. The Company performs an assessment of the fair value of the assets if indicators of impairment are identified during a reporting period and records the assets at the lower of the net book value or the fair value of the assets.

The Company capitalizes internal costs incurred to develop software for internal use during the application development stage. The Company expenses costs related to the planning and post-implementation phases of development of software for internal use as these costs are incurred. Maintenance and enhancement costs (including costs in the post-implementation stages) are expensed as incurred, unless such costs relate to substantial upgrades and enhancements to the software resulting in added functionality, in which case the costs are capitalized. Amortization of capitalized internally developed software costs is recorded in depreciation expense over the useful life of the related asset.

The Company records certain construction costs incurred by a landlord as an asset and corresponding financing obligation on the Company's consolidated balance sheets as the owner of the buildings for accounting purposes.

Capital Leases

Capital Leases

The assets and liabilities associated with capital lease agreements are recorded at the present value of the minimum lease payments at the inception of the lease agreement. The assets are amortized using the straight-line method over the estimated useful life of the related asset or the remaining life of the associated lease. Amortization of assets that the Company leases pursuant to a capital lease is included in depreciation expense. The Company performs an assessment of the fair value of the assets if indicators of impairment are identified during a reporting period and records the assets at the lower of the net book value or the fair value of the assets. Assets recorded under capital leases are recorded within "Property and equipment, net" and liabilities related to those assets are recorded within "Capital lease obligations, current portion" and "Capital lease obligations, excluding current portion," on the Company's consolidated balance sheets.

Income Taxes

Income Taxes    

Deferred tax assets and liabilities are recognized for the expected future tax consequences of temporary differences between the financial statement carrying amounts and the income tax bases of assets and liabilities. A valuation allowance is applied against any net deferred tax asset if, based on the available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized.

The Company records liabilities related to uncertain tax positions by prescribing a minimum recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. The Company does not believe any such uncertain tax positions currently pending will have a material adverse effect on its consolidated financial statements.

Variable Interest Entities

Variable Interest Entities

The Company reviews each collaboration agreement pursuant to which the Company licenses assets owned by a collaborator in order to determine whether or not the collaborator is a VIE. If the collaborator is a VIE, the Company assesses whether or not the Company is the primary beneficiary of that VIE based on a number of factors, including (i) which party has the power to direct the activities that most significantly affect the VIE’s economic performance, (ii) the parties’ contractual rights and responsibilities pursuant to the collaboration agreement and (iii) which party has the obligation to absorb losses or the right to receive benefits from the VIE. If the Company determines it is the primary beneficiary of a VIE at the onset of the collaboration agreement, the collaboration is treated as a business combination and the Company consolidates the financial statements of the VIE into the Company’s consolidated financial statements. The Company evaluates whether it continues to be the primary beneficiary of any consolidated VIEs on a quarterly basis. If the Company determines that it is no longer the primary beneficiary of a consolidated VIE, or no longer has a variable interest in the VIE, it deconsolidates the VIE in the period that the determination is made.

Business Combinations

Business Combinations

The Company assigns the value of consideration, including contingent consideration, transferred in business combinations to the appropriate accounts on the Company's consolidated balance sheet based on their fair value as of the effective date of the transaction. If a collaboration has been treated as a business combination and there are contingent payments, increases in the fair value of the contingent payments pursuant to collaborations accounted for as business combinations result in a decrease in net income attributable to Vertex (or an increase in net loss attributable to Vertex) on a dollar-for-dollar basis. Transaction costs and any restructuring costs associated with these transactions are expensed as incurred.

Fair Value of In-Process Research and Development Asset and Contingent payments in Business Combinations

Fair Value of In-process Research and Development Assets and Contingent Payments in Business Combinations

The present-value models used to estimate the fair values of research and development assets and contingent payments pursuant to collaborations incorporate significant assumptions, including: assumptions regarding the probability of obtaining marketing approval and/or achieving relevant development milestones for a drug candidate; estimates regarding the timing of and the expected costs to develop a drug candidate; estimates of future cash flows from potential product sales and/or the potential to achieve certain commercial milestones with respect to a drug candidate; and the appropriate discount and tax rates.

In-process Research and Development Assets

In-process Research and Development Assets

The Company records the fair value of in-process research and development assets as of the transaction date of a business combination. Each of these assets is accounted for as an indefinite-lived intangible asset and is maintained on the Company’s consolidated balance sheet until either the project underlying it is completed or the asset becomes impaired. If the asset becomes impaired or is abandoned, the carrying value of the related intangible asset is written down to its fair value, and an impairment charge is recorded in the period in which the impairment occurs. If a project is completed, the carrying value of the related intangible asset is amortized as a part of cost of product revenues over the remaining estimated life of the asset beginning in the period in which the project is completed. In-process research and development assets are tested for impairment on an annual basis as of October 1, and more frequently if indicators are present or changes in circumstances suggest that impairment may exist.

Goodwill

Goodwill

The difference between the purchase price and the fair value of assets acquired and liabilities assumed in a business combination is allocated to goodwill. Goodwill is evaluated for impairment on an annual basis as of October 1, and more frequently if indicators are present or changes in circumstances suggest that impairment may exist.

Deconsolidation and Discounted Operations

Deconsolidation and Discontinued Operations

Upon the occurrence of certain events and on a regular basis, the Company evaluates whether it no longer has a controlling financial interest in its subsidiaries, including deemed subsidiaries such as consolidated VIEs. If it is determined that the Company no longer has a controlling interest, the subsidiary is deconsolidated. The Company records a gain or loss on deconsolidation based on the difference on the deconsolidation date between (i) the aggregate of (a) the fair value of any consideration received, (b) the fair value of any retained noncontrolling investment in the former subsidiary and (c) the carrying amount of any noncontrolling interest in the subsidiary being deconsolidated, less (ii) the carrying amount of the former subsidiary’s assets and liabilities.

The Company assesses whether a deconsolidation is required to be presented as discontinued operations in its consolidated financial statements on the deconsolidation date. This assessment is based on whether or not (i) the operations and cash flows to the former subsidiary have been or will be eliminated from the Company's ongoing operations as a result of the deconsolidation event and (ii) the Company will have any significant continuing involvement in the operations of the former subsidiary after the deconsolidation event. If the Company determines that a deconsolidation requires presentation as a discontinued operation on the deconsolidation date, or at any point during the one year period following such date, it will present the former subsidiary as a discontinued operation in current and comparative period financial statements.

Derivative Instruments, Embedded Derivatives and Hedging Activities

Derivative Instruments, Embedded Derivatives and Hedging Activities

The Company has entered into financial transactions involving free-standing derivative instruments and embedded derivatives in the past. Embedded derivatives are required to be bifurcated from the host instruments because the derivatives are not clearly and closely related to the host instruments. The Company determines the fair value of each derivative instrument or embedded derivative that is identified on the date of issuance and at the end of each quarterly period. The estimates of the fair value of these derivatives, particularly with respect to derivatives related to the achievement of milestones in the development of telaprevir, included significant assumptions regarding the estimates market participants would make in order to evaluate these derivatives.

The Company recognizes the fair value of hedging instruments that are designated and qualify as hedging instruments pursuant to GAAP, primarily foreign currency forward contracts, as either assets or liabilities on the consolidated balance sheets. Changes in the fair value of hedging instruments are recorded each period in accumulated other comprehensive loss until the date of settlement, at which point the cumulative change in the fair value since the inception of the hedge is recognized in "Product revenues, net," in its consolidated statements of operations. The Company classifies the cash flows from hedging instruments in the same category as the cash flows from the hedged items.

The Company assesses, both at inception and on an ongoing basis, whether the foreign currency forward contracts used in hedging transactions are highly effective in offsetting the changes in cash flows of the hedged items. The Company also assesses hedge ineffectiveness quarterly and, if determined to be ineffective, records the gain or loss related to the ineffective portion to earnings in "Other income (expense), net" in the consolidated statements of operations.

Restructuring Expense

Restructuring Expenses

The Company records costs and liabilities associated with exit and disposal activities based on estimates of fair value in the period the liabilities are incurred. In periods subsequent to the initial measurement, the Company measures changes to the liability using the credit-adjusted risk-free discount rate applied in the initial period. The Company evaluates and adjusts these liabilities as appropriate for changes in circumstances at least on a quarterly basis.

Comprehensive Income (Loss)

Comprehensive Income (Loss)

Comprehensive income (loss) consists of net income (loss) and other comprehensive income (loss), which includes foreign currency translation adjustments and unrealized gains and losses on foreign currency forward contracts and certain marketable securities. For purposes of comprehensive income (loss) disclosures, the Company does not record tax provisions or benefits, as the Company intends to permanently reinvest undistributed earnings in its foreign subsidiaries.

Foreign Currency Translation and Transactions

Foreign Currency Translation and Transactions

All material consolidated entities have the U.S. dollar as their functional currency. Non-U.S. dollar functional currency subsidiaries have assets and liabilities translated into U.S. dollars at rates of exchange in effect at the end of the year. Revenue and expense amounts are translated using the average exchange rates for the period. Net unrealized gains and losses resulting from foreign currency translation are included in accumulated other comprehensive loss, which is a separate component of shareholders’ equity.

Net Income (Loss) Per Share Attributable to Vertex Common Stockholders

Net Income (Loss) Per Share Attributable to Vertex Common Shareholders

Basic and diluted net income per share attributable to Vertex common shareholders are presented in conformity with the two-class method required for participating securities. Under the two-class method, earnings are allocated to (i) Vertex common shares, excluding unvested restricted stock, and (ii) participating securities, based on their respective weighted-average shares outstanding for the period. Shares of unvested restricted stock granted under the Company's Amended and Restated 2006 Stock and Option Plan have the non-forfeitable right to receive dividends on an equal basis with other outstanding common stock. As a result, these unvested shares of restricted stock are considered participating securities under the two-class method. Potentially dilutive shares result from the assumed exercise of outstanding stock options (the proceeds of which are then assumed to have been used to repurchase outstanding stock using the treasury stock method) and the assumed conversion of convertible notes.

Basic net loss per share attributable to Vertex common shareholders is based upon the weighted-average number of common shares outstanding during the period, excluding restricted stock that has been issued but is not yet vested. Diluted net loss per share attributable to Vertex common shareholders is based upon the weighted-average number of common shares outstanding during the period plus additional weighted-average common equivalent shares outstanding during the period when the effect is dilutive.

Recent Accounting Pronouncements

Recent Accounting Pronouncements

The Company did not adopt any new accounting pronouncements during 2013 that had a material effect on the Company’s consolidated financial statements.

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Commitments (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011 leases
Operating lease
Number of leases (leases)			2
Future minimum commitments under facility leases commitments with terms of more than one year
2014	$ 119,301,000
2015	116,487,000
2016	101,519,000
2017	100,080,000
2018	86,673,000
Thereafter	828,142,000
Total minimum lease payments	1,352,202,000
Future minimum sublease income
2014	(8,546,000)
2015	(3,996,000)
2016	0
2017	0
2018	0
Thereafter	0
Total minimum lease payments	(12,542,000)
Rental expense	57,700,000	57,100,000	49,400,000
Fan Pier Leases
Future minimum commitments under facility leases commitments with terms of more than one year
2014	67,206,000
2015	67,206,000
2016	67,206,000
2017	67,206,000
2018	67,206,000
Thereafter	752,798,000
Total minimum lease payments	1,088,828,000
Kendall Square Lease
Operating lease
Optional term of lease agreement (in years)			10 years
Office space used for operation (in square feet)	120,000
Future minimum commitments under facility leases commitments with terms of more than one year
2014	19,879,000
2015	19,879,000
2016	19,879,000
2017	19,879,000
2018	6,626,000
Thereafter	0
Total minimum lease payments	86,142,000
Other Operating Leases
Future minimum commitments under facility leases commitments with terms of more than one year
2014	40,762,000
2015	33,398,000
2016	14,434,000
2017	12,995,000
2018	12,841,000
Thereafter	75,344,000
Total minimum lease payments	$ 189,774,000
Minimum
Future minimum sublease income
Effective interest rate (percentage)	2.00%
Maximum
Future minimum sublease income
Effective interest rate (percentage)	7.00%

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Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Components of income (loss) before provision for (benefit from) income taxes
United States									$ (390,009)	$ 256,816	$ 343,515
Foreign									(586,108)	(269,197)	(283,070)
Income (loss) before provision for (benefit from) income taxes	(340,253)	(129,413)	(63,511)	(442,940)	(80,772)	(5,112)	(14,405)	87,908	(976,117)	(12,381)	60,445
Current taxes:
United States									(11,420)	2,057	22,275
Foreign									1,084	(1,865)	(561)
State									2,136	1,902	8,655
Total current taxes									(8,200)	2,094	30,369
Deferred taxes:
United States									(131,281)	31,308	19,629
Foreign									(127,587)	0	(32,692)
State									(21,499)	5,352	1,960
Total deferred taxes									(280,367)	36,660	(11,103)
Provision for (benefit from) income taxes	$ (155,704)	$ (751)	$ (1,799)	$ (130,313)	$ (2,696)	$ 21,355	$ 20,063	$ 32	$ (288,567)	$ 38,754	$ 19,266

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Fair Value Measurements (Details) (Recurring basis, USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Total
Financial assets carried at fair value:
Total	$ 1,151,466
Total | Money market funds
Financial assets carried at fair value:
Cash equivalents:	255,689
Total | Government-sponsored enterprise securities
Financial assets carried at fair value:
Marketable securities:	600,450
Total | Commercial paper
Financial assets carried at fair value:
Marketable securities:	83,493
Total | Corporate debt securities
Financial assets carried at fair value:
Marketable securities:	211,834
Level 1
Financial assets carried at fair value:
Total	856,139
Level 1 | Money market funds
Financial assets carried at fair value:
Cash equivalents:	255,689
Level 1 | Government-sponsored enterprise securities
Financial assets carried at fair value:
Marketable securities:	600,450
Level 1 | Commercial paper
Financial assets carried at fair value:
Marketable securities:	0
Level 1 | Corporate debt securities
Financial assets carried at fair value:
Marketable securities:	0
Level 2
Financial assets carried at fair value:
Total	295,327
Level 2 | Money market funds
Financial assets carried at fair value:
Cash equivalents:	0
Level 2 | Government-sponsored enterprise securities
Financial assets carried at fair value:
Marketable securities:	0
Level 2 | Commercial paper
Financial assets carried at fair value:
Marketable securities:	83,493
Level 2 | Corporate debt securities
Financial assets carried at fair value:
Marketable securities:	211,834
Level 3
Financial assets carried at fair value:
Total	0
Level 3 | Money market funds
Financial assets carried at fair value:
Cash equivalents:	0
Level 3 | Government-sponsored enterprise securities
Financial assets carried at fair value:
Marketable securities:	0
Level 3 | Commercial paper
Financial assets carried at fair value:
Marketable securities:	0
Level 3 | Corporate debt securities
Financial assets carried at fair value:
Marketable securities:	$ 0

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Restructuring Expense (Details 2) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended							108 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2003	Dec. 31, 2013 2003 Restructuring	Dec. 31, 2012 2003 Restructuring	Dec. 31, 2011 2003 Restructuring	Dec. 31, 2012 2003 Restructuring
Restructuring activities
Liability, beginning of the period													$ 23,328	$ 26,313	$ 29,595	$ 69,526
Cash Payments												(17,816)	(15,255)	(14,853)	(14,904)	(178,952)
Cash received from subleases													10,670	10,024	9,548	75,708
Credit for portion of facility Vertex decided to occupy in 2005													0	0	0	(10,018)
Restructuring Expense	27,658	12,048	776	39	194	696	594	360	40,521	1,844	2,074	91,824	372	1,844	2,074	62,851
Liability, end of the period												$ 69,526	$ 19,115	$ 23,328	$ 26,313	$ 23,328

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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues from external customers
Product revenues, net	$ 128,822	$ 186,653	$ 254,789	$ 267,381	$ 281,309	$ 303,501	$ 373,273	$ 375,375	$ 837,645	$ 1,333,458	$ 950,889
Total revenues	351,157	221,700	310,750	328,368	333,994	336,006	418,305	438,737	1,211,975	1,527,042	1,410,626
Property and equipment, net	696,911				433,609				696,911	433,609
United States
Revenues from external customers
Total revenues									896,952	1,373,516	1,389,568
Property and equipment, net	657,587				400,102				657,587	400,102
Europe [Member]
Revenues from external customers
Total revenues									279,557	129,786	20,289
Outside of the United States
Revenues from external customers
Total revenues									315,023	153,526	21,058
Property and equipment, net	39,324				33,507				39,324	33,507
United Kingdom
Revenues from external customers
Property and equipment, net	29,970				30,622				29,970	30,622
Other
Revenues from external customers
Total revenues									35,466	23,740	769
Property and equipment, net	9,354				2,885				9,354	2,885
Minimum | Revenues, Net
Revenues from external customers
Concentration risk (less than 10% for Cardinal health, Janssen and Mitsubishi Tanabe) (percentage)									10.00%	10.00%
Minimum | Accounts Receivable
Revenues from external customers
Threshold for disclosure percentage	10.00%				10.00%				10.00%	10.00%
Credit Concentration Risk | Janssen | Revenues, Net
Revenues from external customers
Concentration risk (less than 10% for Cardinal health, Janssen and Mitsubishi Tanabe) (percentage)									22.00%	10.00%	19.00%
Credit Concentration Risk | Janssen | Accounts Receivable
Revenues from external customers
Concentration risk (less than 10% for Cardinal health, Janssen and Mitsubishi Tanabe) (percentage)									28.00%	26.00%
Credit Concentration Risk | AmerisourceBergen Drug Corporation | Revenues, Net
Revenues from external customers
Concentration risk (less than 10% for Cardinal health, Janssen and Mitsubishi Tanabe) (percentage)									21.00%	32.00%	25.00%
Credit Concentration Risk | AmerisourceBergen Drug Corporation | Accounts Receivable
Revenues from external customers
Concentration risk (less than 10% for Cardinal health, Janssen and Mitsubishi Tanabe) (percentage)									10.00%	22.00%
Credit Concentration Risk | McKesson Corporation | Revenues, Net
Revenues from external customers
Concentration risk (less than 10% for Cardinal health, Janssen and Mitsubishi Tanabe) (percentage)									21.00%	29.00%	24.00%
Credit Concentration Risk | McKesson Corporation | Accounts Receivable
Revenues from external customers
Concentration risk (less than 10% for Cardinal health, Janssen and Mitsubishi Tanabe) (percentage)									10.00%	26.00%
Credit Concentration Risk | Cardinal Health Incorporated | Revenues, Net
Revenues from external customers
Concentration risk (less than 10% for Cardinal health, Janssen and Mitsubishi Tanabe) (percentage)									10.00%	15.00%	15.00%
Credit Concentration Risk | Cardinal Health Incorporated | Accounts Receivable
Revenues from external customers
Concentration risk (less than 10% for Cardinal health, Janssen and Mitsubishi Tanabe) (percentage)									10.00%	10.00%
Credit Concentration Risk | Bupa Home Healthcare Limited | Revenues, Net
Revenues from external customers
Concentration risk (less than 10% for Cardinal health, Janssen and Mitsubishi Tanabe) (percentage)									10.00%	10.00%
Credit Concentration Risk | Bupa Home Healthcare Limited | Accounts Receivable
Revenues from external customers
Concentration risk (less than 10% for Cardinal health, Janssen and Mitsubishi Tanabe) (percentage)									14.00%
INCIVEK
Revenues from external customers
Product revenues, net									466,360	1,161,813	950,889
KALYDECO
Revenues from external customers
Product revenues, net									$ 371,285	$ 171,645	$ 0

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Restructuring Expense-Strategic Restructuring (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013 sqft	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013 sqft	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2003
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges									$ 500,000	$ 7,900,000
Restructuring Expense	27,658,000	12,048,000	776,000	39,000	194,000	696,000	594,000	360,000			40,521,000	1,844,000	2,074,000	91,824,000
Cash Payments														(17,816,000)
Non-cash Expense											7,594,000	0	0
Restructuring Liability														69,526,000
Area of Real Estate Property	120,000										120,000
Minimum
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges											2,000,000
Maximum
Restructuring Cost and Reserve [Line Items]
Expected restructuring charges											2,500,000
2013 Restructuring Plan
Restructuring Cost and Reserve [Line Items]
Restructuring Expense											38,951,000
Cash Payments											(22,916,000)
Non-cash Expense											(7,594,000)
Restructuring Liability	8,441,000										8,441,000
2013 Restructuring Plan | Employee severance, benefits and related costs
Restructuring Cost and Reserve [Line Items]
Restructuring Expense											25,060,000
Cash Payments											(21,458,000)
Non-cash Expense											(1,312,000)
Restructuring Liability	2,290,000										2,290,000
2013 Restructuring Plan | Asset impairments
Restructuring Cost and Reserve [Line Items]
Restructuring Expense											6,282,000
Cash Payments											0
Non-cash Expense											(6,282,000)
Restructuring Liability	0										0
2013 Restructuring Plan | Contract termination and other associated costs
Restructuring Cost and Reserve [Line Items]
Restructuring Expense											7,609,000
Cash Payments											(1,458,000)
Non-cash Expense											0
Restructuring Liability	$ 6,151,000										$ 6,151,000

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September 2009 Financial Transactions (Details) (USD $)	12 Months Ended			1 Months Ended		12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Feb. 28, 2011 Olmsted Park S.A. [Member]	Sep. 30, 2009 Olmsted Park S.A. [Member] agreements	Dec. 31, 2011 Olmsted Park S.A. [Member]	Oct. 31, 2011 Olmsted Park S.A. [Member]
2012 Notes
Face amount of 2012 Notes					$ 155,000,000
Proceeds from issuance of 2012 Notes					122,200,000
Proceeds from milestone payment related to the acceptance of Janssen's MAA				50,000,000
Portion of 2012 Notes redeemed upon achievement of certain approval milestone pursuant to the Janssen collaboration				50,000,000
Earned remaining milestone payment to be received in the fourth quarter of 2011							105,000,000
Sale of Contingent Milestone Payments
Number of purchase agreements entered into related to sale of contingent launch milestone payments pursuant to the Janssen collaboration (agreements)					2
Value of potential contingent launch milestone payments sold pursuant to the Janssen collaboration					95,000,000
Proceeds from sale of potential contingent launch milestone payments pursuant to the Janssen collaboration					32,800,000
Expenses and Losses (Gains):
Interest expense related to 2012 Notes						21,687,000
Change in fair value of embedded derivative related to 2012 Notes						(400,000)
Change in fair value of free-standing derivatives related to the sale of milestone payments	0	0	16,801,000			17,201,000
Total September 2009 financial transaction expenses						$ 38,488,000

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Restructuring Expense

12 Months Ended

Dec. 31, 2013

Restructuring and Related Activities [Abstract]

Restructuring Expense

Restructuring Expenses

2003 Restructuring

In June 2003, Vertex adopted a plan to restructure its operations to coincide with its increasing internal emphasis on advancing drug candidates through clinical development to commercialization. The restructuring was designed to re-balance the Company’s relative investments in research and development to better support the Company’s long-term strategy. At that time, the restructuring plan included a workforce reduction, write-offs of certain assets and a decision not to occupy approximately 290,000 square feet of specialized laboratory and office space in Cambridge, Massachusetts under lease to Vertex (the “Kendall Square Lease”). The Kendall Square Lease commenced in January 2003 and has a 15-year term. In the second quarter of 2005, the Company revised its assessment of its real estate requirements and decided to use approximately 120,000 square feet of the facility subject to the Kendall Square Lease (the “Kendall Square Facility”) for its operations, beginning in 2006. The remaining rentable square footage of the Kendall Square Facility currently is subleased to third parties.

The Company’s initial estimate of its liability for net ongoing costs associated with the Kendall Square Lease obligation was recorded in the second quarter of 2003 at fair value. The restructuring expense incurred from the second quarter of 2003 through the end of the first quarter of 2005 (i.e., immediately prior to the Company’s decision to use a portion of the Kendall Square Facility for its operations) relates to the estimated incremental net ongoing lease obligations associated with the entire Kendall Square Facility, together with imputed interest costs relating to the restructuring liability. The restructuring expense incurred in the period beginning in the second quarter of 2005 relates only to the portion of the Kendall Square Facility that the Company was not occupying and did not intend to occupy for its operations. The remaining lease obligations, which are associated with the portion of the Kendall Square Facility that the Company occupies and uses for its operations, are recorded as rental expense in the period incurred. In 2014, the Company expects to cease using this portion of the Kendall Square Facility for its operations, and to incur related cease use charges. The Company reviews its assumptions and estimates quarterly and updates its estimates of this liability as changes in circumstances require. The expense and liability recorded is calculated using probability-weighted discounted cash-flows of the Company’s estimated ongoing lease obligations, including contractual rental and build-out commitments, net of estimated sublease rentals, offset by related sublease costs.

In estimating the expense and liability under its Kendall Square Lease obligation, the Company estimated (i) the costs to be incurred to satisfy rental and build-out commitments under the lease (including operating costs), (ii) the lead-time necessary to sublease the space, (iii) the projected sublease rental rates, and (iv) the anticipated durations of subleases. The Company uses a credit-adjusted risk-free rate of approximately 10% to discount the estimated cash flows. The Company reviews its estimates and assumptions on at least a quarterly basis, intends to continue such reviews until the termination of the Kendall Square Lease, and will make whatever modifications the Company believes necessary, based on the Company’s best judgment, to reflect any changed circumstances. The Company’s estimates have changed in the past, and may change in the future, resulting in additional adjustments to the estimate of the liability. Changes to the Company’s estimate of the liability are recorded as additional restructuring expenses (credits). In addition, because the Company’s estimate of the liability includes the application of a discount rate to reflect the time-value of money, the Company records imputed interest costs related to the liability each quarter. These costs are included in restructuring expenses on the Company’s consolidated statements of operations.

The activity related to restructuring and other liability for 2003 was as follows:

	Restructuring Expense		Cash Payments			Non-cash Expense			Liability as of December 31, 2003
	(in thousands)
Lease restructuring and other operating lease expense	$	84,726	$	(15,200	)	$	—		$	69,526
Employee severance, benefits and related costs	2,616		(2,616		)	—			—
Leasehold improvements and asset impairments	4,482		—			(4,482		)	—
Total	$	91,824	$	(17,816	)	$	(4,482	)	$	69,526

In 2003, the lease restructuring and other operating lease expense included $78.7 million of lease restructuring expense and $6.0 million of lease operating expense incurred prior to the decision not to occupy the Kendall Square Facility. The restructuring accrual as of December 31, 2003 related only to the lease restructuring expense.

The activity related to 2003 restructuring for 2004 through 2013 was as follows:

	2013			2012			2011			2004-2013
	(in thousands)
Liability, beginning of the period	$	23,328		$	26,313		$	29,595		$	69,526
Cash payments	(15,255		)	(14,853		)	(14,904		)	(178,952		)
Cash received from subleases	10,670			10,024			9,548			75,708
Credit for portion of facility Vertex decided to occupy in 2005	—			—			—			(10,018		)
Restructuring expense	372			1,844			2,074			62,851
Liability, end of the period	$	19,115		$	23,328		$	26,313		$	19,115

In each period, the Company records lease restructuring expense attributable to imputed interest related to the restructuring liability. In certain periods, the restructuring expense also reflects the revision of certain key estimates and assumptions about building operating expenses and sublease income.

Fan Pier Move Restructuring

In connection with the relocation of its Massachusetts operations to Fan Pier in Boston, Massachusetts, the Company expects to incur restructuring charges related to its remaining lease obligations at its facilities in Cambridge, Massachusetts, including lease obligations related to the 120,000 square feet of the facility subject to the Kendall Square lease that the Company began using for its operations in 2006. The Company started incurring these charges in the fourth quarter of 2013 and expects them to continue through April 2018. Most of these restructuring charges will relate to cease use charges that will be incurred during the first half of 2014. The Company incurred $1.2 million of charges related to this restructuring during 2013. The continuing charges will relate to the difference between the Company’s estimated future cash flows related to its lease obligations and the actual cash flows that it incurs.

2013 Strategic Restructuring

In October 2013, the Company adopted a restructuring plan. The restructuring plan included (i) a workforce reduction primarily related to the commercial support of INCIVEK following the continued and rapid decline in the number of patients being treated with INCIVEK as new medicines for the treatment of HCV infection neared approval and (ii) the write-off of certain assets. This action resulted from the Company's decision to focus its investment on future opportunities in cystic fibrosis and other research and development programs.

The restructuring charges recorded during 2013 for each major type of cost associated with this restructuring plan were as follows:

	Restructuring Expense		Cash Payments			Non-cash Expense			Liability as of December 31, 2013
	(in thousands)
Employee severance, benefits and related costs	$	25,060	$	(21,458	)	$	(1,312	)	$	2,290
Asset impairments	6,282		—			(6,282		)	—
Contract termination and other associated costs	7,609		(1,458		)	—			6,151
Total	$	38,951	$	(22,916	)	$	(7,594	)	$	8,441

The Company estimates that it will incur aggregate restructuring charges of approximately $2.0 million to $2.5 million in 2014 and 2015 related to this restructuring plan. The Company anticipates cash payments of $7.9 million and $0.5 million will be made in 2014 and 2015, respectively, related to the restructuring liability as of December 31, 2013.

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Segment Information (Tables)

12 Months Ended

Dec. 31, 2013

Segment Reporting [Abstract]

Revenues by Product

Product revenues, net consisted of the following:

	2013		2012		2011
	(in thousands)
INCIVEK	$	466,360	$	1,161,813	$	950,889
KALYDECO	371,285		171,645		—
Total product revenues, net	$	837,645	$	1,333,458	$	950,889

Revenues and Property and Equipment by Location

Property and equipment, net by location consisted of the following:

	As of December 31,
	2013		2012
	(in thousands)
United States	$	657,587	$	400,102
Outside of the United States
United Kingdom	29,970		30,622
Other	9,354		2,885
Total property and equipment, net outside of the United States	39,324		33,507
Total property and equipment, net	$	696,911	$	433,609

Total revenues from external customers and collaborators by geographic region consisted of the following. Product revenues are attributed to countries based on the location of the customer. Collaborative revenues are attributed to the operations of the Company in the United States. Royalty revenues are attributed to countries based on the location of the collaborator.

	2013		2012		2011
	(in thousands)
United States	$	896,952	$	1,373,516	$	1,389,568
Outside of the United States
Europe	279,557		129,786		20,289
Other	35,466		23,740		769
Total revenues outside of the United States	315,023		153,526		21,058
Total revenues	$	1,211,975	$	1,527,042	$	1,410,626

Significant Customers

Gross revenues and accounts receivable from each of the Company’s customers who individually accounted for 10% or more of total gross revenues and/or 10% or more of total gross accounts receivable consisted of the following:

	Percent of Total Gross Revenues						Percent of Gross Accounts Receivable
	Year Ended December 31,						As of December 31,
	2013		2012		2011		2013		2012
Janssen	22	%	<10	%	19	%	28	%	26	%
AmerisourceBergen Drug Corporation	21	%	32	%	25	%	<10	%	22	%
McKesson Corporation	21	%	29	%	24	%	<10	%	26	%
Cardinal Health Incorporated	<10	%	15	%	15	%	<10	%	<10	%
Bupa Home Healthcare Limited	<10	%	N/A		N/A		14	%	N/A

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Accrued Expenses and Other Liabilities, Current Portion (Tables)

12 Months Ended

Dec. 31, 2013

Payables and Accruals [Abstract]

Accrued expenses and other current liabilities

Accrued expenses consisted of the following:

	As of December 31,
	2013		2012
	(in thousands)
Product revenue allowances	$	85,510	$	69,936
Payroll and benefits	76,785		62,140
Research, development and commercial contract costs	52,468		63,960
Royalty payable	18,334		29,007
Other	16,241		18,932
Professional fees	10,593		11,226
Taxes payable	8,362		2,182
Unrecognized tax benefits	2,784		4,106
Interest	—		3,395
Total	$	271,077	$	264,884

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Restructuring Expense (Details) (USD $)	3 Months Ended								12 Months Ended							1 Months Ended		12 Months Ended		12 Months Ended				108 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2003	Dec. 31, 2003 Lease restructuring and other operating lease expense	Dec. 31, 2003 Employee severance, benefits and related costs	Dec. 31, 2003 Leasehold improvements and asset impairments	Jun. 30, 2003 Kendall Square Facility squarefeet	Jan. 31, 2003 Kendall Square Facility	Dec. 31, 2006 Kendall Square Facility squarefeet	Dec. 31, 2003 Kendall Square Facility	Dec. 31, 2013 Fan Pier Move	Dec. 31, 2013 2003 Restructuring	Dec. 31, 2012 2003 Restructuring	Dec. 31, 2011 2003 Restructuring	Dec. 31, 2012 2003 Restructuring	Dec. 31, 2010 2003 Restructuring	Dec. 31, 2003 2003 Restructuring
Kendall Square Lease
Leased area (in square feet)																290,000
Lease term (in years)																	15 years
Occupied leased area (in square feet)																		120,000
Discount rate, lease restructuring liability (as a percent)																			10.00%
Restructuring Expense	$ 27,658,000	$ 12,048,000	$ 776,000	$ 39,000	$ 194,000	$ 696,000	$ 594,000	$ 360,000	$ 40,521,000	$ 1,844,000	$ 2,074,000	$ 91,824,000	$ 84,726,000	$ 2,616,000	$ 4,482,000					$ 1,200,000	$ 372,000	$ 1,844,000	$ 2,074,000	$ 62,851,000
Cash Payments												(17,816,000)	(15,200,000)	(2,616,000)	0						(15,255,000)	(14,853,000)	(14,904,000)	(178,952,000)
Non-cash Expense												(4,482,000)	0	0	(4,482,000)
Restructuring Liability												69,526,000	69,526,000	0	0						19,115,000	23,328,000	26,313,000	23,328,000	29,595,000	69,526,000
Lease restructuring expense												78,700,000
Lease operating expense												$ 6,000,000

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Fair Value Measurements (Tables)

12 Months Ended

Dec. 31, 2013

Fair Value Disclosures [Abstract]

Financial assets subject to fair value measurements (excluding restricted cash and cash equivalents (Alios))

The following table sets forth the Company’s financial assets subject to fair value measurements:

	Fair Value Measurements as of December 31, 2013
			Fair Value Hierarchy
	Total		Level 1		Level 2		Level 3
	(in thousands)
Financial assets carried at fair value:
Cash equivalents:
Money market funds	$	255,689	$	255,689	$	—	$	—
Marketable securities:
Government-sponsored enterprise securities	600,450		600,450		—		—
Commercial paper	83,493		—		83,493		—
Corporate debt securities	211,834		—		211,834		—
Total	$	1,151,466	$	856,139	$	295,327	$	—

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Nature of Business and Accounting Policies (Details) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013 product	Dec. 31, 2012	Dec. 31, 2011
Product revenues allowances and reserve categories
Gross product sales adjusted, related to prior period sales (percent)										0.70%	1.30%
Number of products (products)									2
Net income (loss) attributable to Vertex common shareholders	$ 44,285,000	$ (124,132,000)	$ (57,165,000)	$ (308,016,000)	$ (76,148,000)	$ (57,543,000)	$ (64,931,000)	$ 91,590,000	$ (445,028,000)	$ (107,032,000)	$ 29,574,000
Basic EPS (usd per share)	$ (0.19)	$ 0.54	$ 0.26	$ 1.43	$ 0.35	$ 0.27	$ 0.31	$ (0.44)	$ 1.98	$ 0.50	$ (0.14)
Cash, cash equivalents and marketable securities	1,470,000,000								1,470,000,000
Product revenues, net
Discount rate for payments made within 30 days (percent)									2.00%
Activity related to product revenues allowances and reserve categories
Beginning Balance				75,393,000				69,363,000	75,393,000	69,363,000	0
Provision related to current period sales									250,944,000	294,025,000	123,618,000
Adjustments related to prior period sales									19,738,000	5,482,000
Credits/payments made									(258,942,000)	(293,477,000)	(54,255,000)
Ending Balance	87,133,000				75,393,000				87,133,000	75,393,000	69,363,000
Trade Allowances
Activity related to product revenues allowances and reserve categories
Beginning Balance				5,416,000				11,162,000	5,416,000	11,162,000	0
Provision related to current period sales									31,395,000	55,913,000	38,228,000
Adjustments related to prior period sales									343,000	29,000
Credits/payments made									(35,619,000)	(61,688,000)	(27,066,000)
Ending Balance	1,535,000				5,416,000				1,535,000	5,416,000	11,162,000
Rebates, Chargebacks and Discounts
Activity related to product revenues allowances and reserve categories
Beginning Balance				63,560,000				52,659,000	63,560,000	52,659,000	0
Provision related to current period sales									204,459,000	216,942,000	75,145,000
Adjustments related to prior period sales									4,474,000	3,883,000
Credits/payments made									(204,249,000)	(209,924,000)	(22,486,000)
Ending Balance	68,244,000				63,560,000				68,244,000	63,560,000	52,659,000
Product Returns
Activity related to product revenues allowances and reserve categories
Beginning Balance				2,852,000				340,000	2,852,000	340,000	0
Provision related to current period sales									5,795,000	2,067,000	553,000
Adjustments related to prior period sales									15,149,000	1,498,000
Credits/payments made									(7,997,000)	(1,053,000)	(213,000)
Ending Balance	15,799,000				2,852,000				15,799,000	2,852,000	340,000
Other Incentives
Activity related to product revenues allowances and reserve categories
Beginning Balance				3,565,000				5,202,000	3,565,000	5,202,000	0
Provision related to current period sales									9,295,000	19,103,000	9,692,000
Adjustments related to prior period sales									(228,000)	72,000
Credits/payments made									(11,077,000)	(20,812,000)	(4,490,000)
Ending Balance	$ 1,555,000				$ 3,565,000				$ 1,555,000	$ 3,565,000	$ 5,202,000

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Convertible Senior Subordinated Notes (Details) (USD $)	3 Months Ended					1 Months Ended	3 Months Ended	12 Months Ended
	Jun. 30, 2013	Dec. 31, 2013		Dec. 31, 2012		Sep. 30, 2010 Convertible Senior Subordinated Notes 3.35 Percent Due 2015	Jun. 30, 2013 Convertible Senior Subordinated Notes 3.35 Percent Due 2015	Dec. 31, 2013 Convertible Senior Subordinated Notes 3.35 Percent Due 2015
Convertible Senior Subordinated Notes
Convertible senior subordinated notes		$ 0	[1]	$ 400,000,000	[1]	$ 400,000,000
Interest rate (as a percent)						3.35%
Net proceeds from convertible debt offering						391,600,000
Underwriting discount						8,400,000
Conversion price (in dollars per share)						$ 48.83
Original conversion rate, number of shares to be issued per $1000 of principal (in shares)								20.4794
Convertible debt principal amount, basis for exchange						1,000
Percent closing price needs to exceed the conversion price for at least 20 trading days within 30 consecutive trading days for provisional redemption (as a percent)						130.00%
Minimum number of days within 30 consecutive trading days the closing price needs to exceed the conversion price for provisional redemption (in days)						20 days
Total consecutive trading days during which the closing price must exceed the conversion price for at least 20 trading days for provisional redemption (in days)						30 days
Redemption price (percent)						100.00%
Debt Conversion, Converted Instrument, Amount							399,800,000
Stock Issued During Period, Shares, Conversion of Convertible Securities (shares)							8,188,448
Stock Redeemed or Called During Period, Value							200,000
Redemption premium (in usd per share)							16.75
Additional shares issued (shares)	87,109
Interest expense							6,700,000
Offset to additional paid-in capital							$ 4,200,000

[1] Amounts as of December 31, 2012 include the assets and liabilities of Vertex’s variable interest entity (“VIE”), Alios BioPharma, Inc. (“Alios”). The Company deconsolidated Alios as of December 31, 2013. Vertex’s interests and obligations with respect to the VIE’s assets and liabilities are limited to those accorded to Vertex in its agreement with Alios. See Note B, "Collaborative Arrangements," to these consolidated financial statements for amounts.

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Inventories Inventories- Schedule of Inventories (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Inventory Disclosure [Abstract]
Raw materials	$ 489		$ 3,754
Work-in-process	9,981		11,317
Finished goods	3,677		15,393
Total	$ 14,147	[1]	$ 30,464	[1]

[1] Amounts as of December 31, 2012 include the assets and liabilities of Vertex’s variable interest entity (“VIE”), Alios BioPharma, Inc. (“Alios”). The Company deconsolidated Alios as of December 31, 2013. Vertex’s interests and obligations with respect to the VIE’s assets and liabilities are limited to those accorded to Vertex in its agreement with Alios. See Note B, "Collaborative Arrangements," to these consolidated financial statements for amounts.

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Restructuring Expense (Tables)

12 Months Ended

Dec. 31, 2013

Restructuring and Related Activities [Abstract]

Restructuring and other liabilities

The activity related to restructuring and other liability for 2003 was as follows:

	Restructuring Expense		Cash Payments			Non-cash Expense			Liability as of December 31, 2003
	(in thousands)
Lease restructuring and other operating lease expense	$	84,726	$	(15,200	)	$	—		$	69,526
Employee severance, benefits and related costs	2,616		(2,616		)	—			—
Leasehold improvements and asset impairments	4,482		—			(4,482		)	—
Total	$	91,824	$	(17,816	)	$	(4,482	)	$	69,526

Activity related to the restructuring liability

The activity related to 2003 restructuring for 2004 through 2013 was as follows:

	2013			2012			2011			2004-2013
	(in thousands)
Liability, beginning of the period	$	23,328		$	26,313		$	29,595		$	69,526
Cash payments	(15,255		)	(14,853		)	(14,904		)	(178,952		)
Cash received from subleases	10,670			10,024			9,548			75,708
Credit for portion of facility Vertex decided to occupy in 2005	—			—			—			(10,018		)
Restructuring expense	372			1,844			2,074			62,851
Liability, end of the period	$	19,115		$	23,328		$	26,313		$	19,115

Restructuring and related costs

The restructuring charges recorded during 2013 for each major type of cost associated with this restructuring plan were as follows:

	Restructuring Expense		Cash Payments			Non-cash Expense			Liability as of December 31, 2013
	(in thousands)
Employee severance, benefits and related costs	$	25,060	$	(21,458	)	$	(1,312	)	$	2,290
Asset impairments	6,282		—			(6,282		)	—
Contract termination and other associated costs	7,609		(1,458		)	—			6,151
Total	$	38,951	$	(22,916	)	$	(7,594	)	$	8,441

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Collaborative Arrangements

12 Months Ended

Dec. 31, 2013

Collaborative Arrangements

Collaborative Arrangements

Collaborative Arrangements

Janssen Pharmaceutica NV

In 2006, the Company entered into a collaboration agreement with Janssen (the "2006 Janssen Agreement") for the development, manufacture and commercialization of telaprevir, which Janssen began marketing under the brand name INCIVO in certain of its territories in September 2011. Under the collaboration agreement, Janssen has exclusive rights to commercialize telaprevir in its territories including Europe, South America, the Middle East, Africa and Australia. In November 2013, the Company and Janssen amended the collaboration agreement (the "2013 Janssen Amendment," as amended the "Janssen Agreement").

Janssen made a $165.0 million up-front license payment to the Company in 2006. The Company amortized the up-front license payment over the Company’s estimated period of performance under the Janssen Agreement through November 2013. As of November 2013, the effective date of the 2013 Janssen Amendment, there was $32.1 million remaining in deferred revenues related to this up-front license payment.

In addition to the up-front license payment, Janssen made contingent milestone payments for successful development, approval and launch of telaprevir as a product in its territories. At the inception of the 2006 Janssen Agreement, the Company determined that all of the contingent milestones were substantive and would result in revenues in the period in which the milestone was achieved. The Company earned $350.0 million of these contingent milestone payments, including a $50.0 million milestone payment earned in the first quarter of 2011 in connection with the European Medicines Agency’s acceptance of the marketing authorization application for INCIVO and an aggregate of $200.0 million in milestone payments earned in the third quarter of 2011 related to the approval of INCIVO by the European Commission and the launch of INCIVO in the European Union. The Company will not receive any further milestone payments under the Janssen Agreement.

Under the Janssen Agreement, each party incurs internal and external reimbursable expenses and is reimbursed by the other party for 50% of these expenses. The Company recognized the full amount of the reimbursable costs it incurred as research and development expenses on its consolidated statements of operations. The Company recognized, including in 2013, the amounts Janssen was obligated to pay the Company with respect to reimbursable expenses, net of reimbursable expenses incurred by Janssen, as collaborative revenues. During 2012 and 2011, Janssen incurred more reimbursable costs than the Company, and the net amounts payable by the Company to reimburse Janssen were recorded as a reduction of collaborative revenues. Each of the parties were responsible for drug supply in its territories. Until December 31, 2013, the Company provided Janssen certain services through the Company’s third-party manufacturing network for telaprevir.

Janssen paid the Company a tiered royalty averaging in the mid-20% range as a percentage of net sales of INCIVO in Janssen’s territories through the fourth quarter of 2013. In addition, Janssen is responsible for certain third-party royalties on net sales of INCIVO in its territories.

Pursuant to the 2013 Janssen Amendment, (i) Janssen made a payment of $152.0 million to the Company in the fourth quarter of 2013; (ii) Janssen's obligations to pay the Company royalties on net sales of INCIVO (telaprevir) terminated after the fourth quarter of 2013; and (iii) Janssen received a fully-paid license to commercialize INCIVO in its territories, subject to the continued payment of certain third-party royalties on its net sales of INCIVO. The Company and Janssen continue to perform activities related to the telaprevir development program.

The Company determined the 2013 Janssen Amendment was a material modification to the 2006 Janssen Agreement because there was a material change to the consideration and deliverables under the agreement and determined that there is one undelivered element under the agreement, as amended, which is the continuation of certain telaprevir development activities. The Company recognized $182.4 million of collaborative revenues pursuant to the Janssen Agreement in the fourth quarter of 2013. This amount was primarily attributable to (i) the residual consideration received from Janssen, including the $152.0 million fourth quarter 2013 payment and the remaining deferred revenues related to the 2006 up-front payment less (ii) the best estimate of selling price for the remaining telaprevir development activities. As of December 31, 2013, the remaining deferred revenue balance related to the Janssen collaboration was $5.0 million and will be recognized as collaborative revenues as telaprevir development program activities are completed.

The agreement will continue in effect until the expiration of Janssen’s third-party royalty obligations, which expire on a country-by-country basis on the later of (a) the last-to-expire patent covering INCIVO or (b) the last required payment by Janssen to the Company pursuant to the agreement. In the European Union, the Company has a patent covering the composition-of-matter of INCIVO that expires in 2026.

During the three years ended December 31, 2013, the Company recognized the following revenues attributable to the Janssen collaboration:

	2013		2012			2011
	(in thousands)
Royalty revenues	$	130,724	$	117,592		$	20,289
Collaborative revenues:
Up-front and amendment payments revenues	$	190,345	$	12,428		$	12,428
Milestone revenues	—		—			250,000
Net reimbursement (payment) for telaprevir development costs	2,793		(3,507		)	(8,418		)
Reimbursement for manufacturing services	10,299		7,257			20,383
Total collaborative revenues attributable to the Janssen collaboration	$	203,437	$	16,178		$	274,393
Total revenues attributable to the Janssen collaboration	$	334,161	$	133,770		$	294,682

Mitsubishi Tanabe Pharma Corporation

The Company has a collaboration agreement (the “MTPC Agreement”) with Mitsubishi Tanabe Pharma Corporation ("Mitsubishi Tanabe") pursuant to which Mitsubishi Tanabe has a fully-paid license to manufacture and commercialize TELAVIC (the brand name under which Mitsubishi Tanabe is marketing telaprevir) in Japan and other specified countries in Asia. In September 2011, Mitsubishi Tanabe obtained approval to market TELAVIC in Japan.

The parties entered into the MTPC Agreement in 2004 and amended it in 2009. Pursuant to the MTPC Agreement, Mitsubishi Tanabe provided financial and other support for the development and commercialization of telaprevir, made a $105.0 million payment in connection with the 2009 amendment of the collaboration agreement and made a $65.0 million commercial milestone payment recognized as collaborative revenues in the fourth quarter of 2011. There are no further payments under this collaboration agreement. Mitsubishi Tanabe is responsible for its own development and manufacturing costs in its territory.

Mitsubishi Tanabe may terminate the MTPC Agreement at any time without cause upon 60 days’ prior written notice to the Company. The MTPC Agreement also may be terminated by either party for a material breach by the other, subject to notice and cure provisions. Unless earlier terminated, the MTPC Agreement will continue in effect until the expiration of the last-to-expire patent covering telaprevir in Mitsubishi Tanabe's territories. In Japan, the Company has a patent covering the composition-of-matter of telaprevir that expires in 2021.

The $105.0 million payment that the Company received in the third quarter of 2009 in connection with the amendment to the MTPC Agreement was a nonrefundable, up-front license fee, and revenues related to the 2009 payment were recognized on a straight-line basis over the period of performance of the Company’s obligations under the amended agreement. The final deferred revenues related to the 2009 up-front license payment were recognized in April 2012. In connection with the amendment to the MTPC Agreement, the Company supplied manufacturing services to Mitsubishi Tanabe, until April 2012, through the Company’s third-party manufacturing network for telaprevir.

The Company did not record any collaborative revenues attributable to the MTPC Agreement in 2013. The table below sets forth the total collaborative revenues attributable to the MTPC Agreement for 2012 or 2011:

	2012		2011
	(in thousands)
Amortized portion of up-front payments	$	12,744	$	38,232
Milestone revenues	485		68,515
Payments for manufacturing services	5,650		14,928
Total collaborative revenues attributable to the Mitsubishi Tanabe collaboration	$	18,879	$	121,675

Cystic Fibrosis Foundation Therapeutics Incorporated

In April 2011, the Company entered into an amendment (the “April 2011 Amendment”) to its existing collaboration agreement with Cystic Fibrosis Foundation Therapeutics Incorporated (“CFFT”) pursuant to which CFFT agreed to provide financial support for (i) development activities for VX-661, a corrector compound discovered under the collaboration, and (ii) additional research and development activities directed at discovering new corrector compounds.

The Company entered into the original collaboration agreement with CFFT in 2004 and amended it several times prior to 2011 to, among other things, provide partial funding for its cystic fibrosis drug discovery and development efforts. In 2006, the Company received a $1.5 million milestone payment from CFFT. There are no additional milestones payable by CFFT to the Company pursuant to the collaboration agreement, as amended. Under the April 2011 Amendment, CFFT agreed to provide the Company with up to $75.0 million in funding over approximately 5 years for corrector-compound research and development activities. The Company retains the right to develop and commercialize KALYDECO (ivacaftor), VX-809, VX-661 and any other compounds discovered during the course of the research collaboration with CFFT. The Company recognized collaborative revenues from this collaboration of $14.3 million, $17.0 million and $13.7 million, respectively, in 2013, 2012 and 2011.

In the original agreement, as amended prior to the April 2011 Amendment, the Company agreed to pay CFFT tiered royalties calculated as a percentage, ranging from single digits to sub-teens, of annual net sales of any approved drugs discovered during the research term that ended in 2008, including KALYDECO, lumacaftor and VX-661. The April 2011 Amendment provides for a tiered royalty in the same range on net sales of corrector compounds discovered during the research term that began in 2011. In each of the third quarter of 2012 and the first quarter of 2013, CFFT earned a commercial milestone payment of $9.3 million from the Company upon achievement of certain sales levels for KALYDECO. These milestones were reflected in the Company's cost of product revenues. There are no additional commercial milestone payments payable by the Company to CFFT related to sales levels for KALYDECO. The Company also is obligated to make a total of two one-time commercial milestone payments upon achievement of certain sales levels for corrector compounds such as lumacaftor or VX-661.

The Company began marketing KALYDECO in the United States in the first quarter of 2012 and began marketing KALYDECO in certain countries in the European Union in the third quarter of 2012. The Company has royalty obligations to CFFT for each compound commercialized pursuant to this collaboration until the expiration of patents covering that compound. The Company has patents in the United States and European Union covering the composition-of-matter of ivacaftor that expire in 2027 and 2025, respectively, subject to potential patent life extensions. The Company has patent applications in the United States and European Union covering the composition-of-matter of lumacaftor that expire in 2026, subject to potential patent life extensions. CFFT may terminate its funding obligations under the collaboration, as amended, in certain circumstances, in which case there will be a proportional adjustment to the royalty rates and commercial milestone payments for certain corrector compounds. The collaboration also may be terminated by either party for a material breach by the other, subject to notice and cure provisions.

Alios BioPharma, Inc.

License and Collaboration Agreement

In June 2011, the Company entered into a license and collaboration agreement (the “Alios Agreement”) with Alios, a privately-held biotechnology company. The Company and Alios are collaborating on the research, development and commercialization of an HCV nucleotide analogue discovered by Alios, ALS-2200 (now formulated as VX-135), which is designed to act on the HCV polymerase.

Under the terms of the Alios Agreement, the Company received exclusive worldwide rights to ALS-2200 (VX-135) and ALS-2158, a second HCV nucleotide analogue discovered by Alios that was developed pursuant to the Alios agreement through the third quarter of 2012. Alios and the Company began clinical development of ALS-2200 (VX-135) and ALS-2158 in December 2011. The Company is responsible for all costs related to development, commercialization and manufacturing of each compound licensed to the Company pursuant to the Alios Agreement and provided funding to Alios to conduct the Phase 1 clinical trials for ALS-2200 and ALS-2158. In addition, the Company provided funding for a research program, which ended in 2013, directed to the discovery of additional HCV nucleotide analogues that act on the HCV polymerase.

Upon entering into the Alios Agreement, the Company paid Alios a $60.0 million up-front payment. As of December 31, 2013, Alios had earned an aggregate of $60.0 million in development milestone payments pursuant to the Alios Agreement. The Alios Agreement provides for development milestone payments to Alios of up to an additional $312.5 million if VX-135 is approved and commercialized. In addition, Alios is eligible to receive commercial milestone payments of up to $750.0 million, as well as tiered royalties on net sales of VX-135.

The Company may terminate the Alios Agreement (i) upon 30 days’ notice to Alios if the Company ceases development after VX-135 has experienced a technical failure and/or (ii) upon 60 days’ notice to Alios at any time after the Company completes Phase 2a clinical trials. The Alios Agreement also may be terminated by either party for a material breach by the other, and by Alios for the Company’s inactivity or if the Company challenges certain Alios patents, in each case subject to notice and cure provisions. Unless earlier terminated, the Alios Agreement will continue in effect until the expiration of the Company’s royalty obligations, which expire on a country-by-country basis on the later of (a) the date the last-to-expire patent covering a licensed product expires or (b) 10 years after the first commercial sale in the country.

Alios is continuing to operate as a separate entity, is engaged in other programs directed at developing novel drugs that are not covered by the Alios Agreement and maintains ownership of the underlying patent rights that are licensed to the Company pursuant to the Alios Agreement. Under applicable accounting guidance, the Company determined that Alios was a VIE, its license to VX-135 and ALS-2158 was a variable interest in Alios, that Alios was a business and that the Company was Alios’ primary beneficiary for the period from June 13, 2011 through December 31, 2013. The Company based these determinations on, among other factors, the significance to Alios of the licensed compounds and on the Company’s power, through the joint steering committee for the licensed compounds established under the Alios Agreement, to direct the activities that most significantly affect the economic performance of Alios.

Accordingly, the Company consolidated Alios’ financial statements with the Company’s consolidated financial statements from June 13, 2011 through December 31, 2013. However, the Company’s interests in Alios were limited to those accorded to the Company in the Alios Agreement. In particular, the Company did not acquire any equity interest in Alios, any interest in Alios’ cash and cash equivalents or any control over Alios’ activities that do not relate to the Alios Agreement. Alios does not have any right to the Company’s assets except as provided in the Alios Agreement.

As of December 31, 2013, the Company determined that it no longer had a variable interest in Alios as a whole and did not possess the power to direct the activities that most significantly affect the economic performance of Alios based on, among other factors, the decline in significance to Alios of the licensed HCV nucleotide analogue program. A full impairment charge of $250.6 million related to the Alios collaboration and a benefit for income taxes of $102.1 million was recorded attributable to Alios. The Company deconsolidated Alios based on this conclusion as of December 31, 2013. The deconsolidation resulted in a gain of $68.2 million recorded in other income (expense), net attributable to Vertex in the consolidated statement of operations for the year ended December 31, 2013. The gain of $68.2 million was approximately the difference between (i) losses the Company recorded in 2011 and 2012 based on increases in the fair value of contingent milestone and royalty payments payable by the Company to Alios and (ii) the aggregate of $120.0 million in up-front and milestone payments that the Company has made to Alios to date pursuant to the Alios Agreement.

The Company continues to have significant continuing involvement with Alios due to the Alios Agreement; therefore, the deconsolidation of Alios is not presented as discontinued operations in the Company's consolidated financial statements as of December 31, 2013. The Company will evaluate whether it continues to have significant continuing involvement with Alios for a period of one year from the December 31, 2013 deconsolidation date.

Please refer to Note J, "Intangible Assets and Goodwill," for further information regarding the impairment of the HCV nucleotide analogue program.

Noncontrolling Interest (Alios)

Prior to the deconsolidation, the Company recorded noncontrolling interest (Alios) on two lines on its consolidated balance sheets. The noncontrolling interest (Alios) was reflected on two separate lines because Alios has both common shareholders and preferred shareholders that are entitled to redemption rights in certain circumstances. The Company recorded net loss (income) attributable to noncontrolling interest (Alios) on its consolidated statements of operations, reflecting Alios' net loss (income) for the reporting period, adjusted for changes in the fair value of contingent milestone payments and royalties payable by the Company to Alios, which was evaluated each reporting period. A summary of net loss (income) attributable to noncontrolling interest (Alios) for the three years ended December 31, 2013 is as follows:

	2013			2012			2011
	(in thousands)
Loss before provision for (benefit from) income taxes	$	283,747		$	20,044		$	9,536
Decrease (increase) in fair value of contingent milestone and royalty payments	124,920			(114,970		)	(69,950		)
Provision for (benefit from) income taxes	(166,145		)	39,029			48,809
Net loss (income) attributable to noncontrolling interest (Alios)	$	242,522		$	(55,897	)	$	(11,605	)

In 2012 and 2011, the fair value of the contingent milestone payments and royalties payable by Vertex to Alios related to the in-licensed HCV nucleotide analogue program increased by $115.0 million and $70.0 million, respectively, due to the advancement of the Company's HCV nucleotide program, including the positive data the Company received in 2012 from a Phase 1 clinical trial that evaluated ALS-2200. As of December 31, 2013, the Company concluded that the fair value of the contingent milestone and royalty payments was zero. This determination was based on, among other factors, (a) safety, tolerability and efficacy data from a Phase 2a clinical trial of VX-135 in combination with daclatasvir that the Company received in late December 2013 and analyzed and announced in January 2014, (b) the continuing partial clinical hold on VX-135 by the U.S. Food and Drug Administration ("FDA"), (c) a review of the existing and emerging data regarding all-oral regimens for HCV infection being developed by the Company's competitors, and (d) the risks associated with establishing collaborations for the potential late-stage development of a combination regimen containing VX-135 and drug candidates controlled by third parties.

The Company used present-value models to determine the estimated fair value of the contingent milestone and royalty payments until it deconsolidated Alios, based on assumptions regarding the probability of achieving the relevant milestones, estimates regarding the time to develop drug candidates, estimates of future product sales and the appropriate discount and tax rates. The Company based its estimate of the probability of achieving the relevant milestones on industry data for similar assets and its own experience. The discount rates used in the valuation model represented a measure of credit risk associated with settling the liability. Significant judgment was used in determining the appropriateness of these assumptions at each reporting period.

Alios Balance Sheet Information

The Company included items related to Alios on the Company's consolidated balance sheet as of December 31, 2012. Due to the deconsolidation of Alios as of December 31, 2013, these items were not included on the Company's consolidated balance sheet as of December 31, 2013. The following table summaries items related to the Alios included on the Company's consolidated balance sheet as of December 31, 2012.

	As of December 31, 2012
		(in thousands)
Restricted cash and cash equivalents (Alios)		$	69,983
Prepaid expenses and other current assets		$	672
Property and equipment, net		$	1,728
Intangible assets		$	250,600
Other assets		$	861
Accounts payable		$	1,054
Accrued expenses		$	6,099
Income taxes payable (Alios)		$	715
Deferred tax liability		$	152,781
Other liabilities, excluding current portion		$	910
Redeemable noncontrolling interest (Alios)		$	38,530
Noncontrolling interest (Alios)		$	196,672

As of December 31, 2012, the Company recorded Alios’ cash and cash equivalents as restricted cash and cash equivalents (Alios) because (i) the Company did not have any interest in or control over Alios’ cash and cash equivalents and (ii) the Alios Agreement did not provide for these assets to be used for the development of the assets that the Company licenses from Alios pursuant to the Alios Agreement. Assets recorded as a result of consolidating Alios’ financial condition into the Company’s consolidated balance sheet did not represent additional assets that could have been used to satisfy claims against the Company’s general assets.

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Inventories-By Product (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Inventory Disclosure [Abstract]
Write-downs of inventories to net realizable value	$ 10,358	$ 133,189	$ 0
Write-down of inventories effect on net income (loss) per share (usd per share)	$ (0.05)	$ (0.61)

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Common Stock, Preferred Stock and Equity Plans (Tables)

12 Months Ended

Dec. 31, 2013

Common Stock, Preferred Stock and Equity Plans

Stock and Stock Option Equity Plans

The following table contains information about the Company’s equity plans:

			As of December 31, 2013
Title of Plan	Group Eligible	Type of Award Granted	Awards Outstanding	Additional Awards Authorized for Grant
2013 Stock and Option Plan	Employees, Non-employee Directors and Consultants	NSO, ISO, RS and RSU	1,170,827	2,129,173
2006 Stock and Option Plan	Employees, Non-employee Directors and Consultants	NSO, ISO, RS and RSU	15,748,949	3,282,178
1996 Stock and Option Plan	Employees, Non-employee Directors, Advisors and Consultants	NSO, ISO and RS	974,303	—
Total			17,894,079	5,411,351

Outstanding and vested options

The following table summarizes information related to the outstanding and exercisable options during the year ended December 31, 2013:

	Stock Options		Weighted-average Exercise Price		Weighted-average Remaining Contractual Life	Aggregate Intrinsic Value
	(in thousands)		(per share)		(in years)	(in thousands)
Outstanding at December 31, 2012	19,726		$	38.09
Granted	4,840		$	57.87
Exercised	(6,995	)	$	35.28
Forfeited	(1,822	)	$	46.89
Expired	(20	)	$	46.64
Outstanding at December 31, 2013	15,729		$	44.40	6.67	$	481,311
Exercisable at December 31, 2013	7,950		$	38.84	5.13	$	283,146
Exercisable and Expected to Vest at December 31, 2013	14,967		$	43.95	6.56	$	463,885

Stock options outstanding and exercisable

The following table summarizes information about stock options outstanding and exercisable at December 31, 2013:

	Options Outstanding				Options Exercisable
Range of Exercise Prices	Number Outstanding	Weighted-average Remaining Contractual Life	Weighted-average Exercise Price		Number Exercisable	Weighted-average Exercise Price
	(in thousands)	(in years)	(per share)		(in thousands)	(per share)
$ 9.09–$20.00	432	2.37	$	15.37	432	$	15.37
$20.01–$30.00	1,055	5.74	$	29.38	812	$	29.23
$30.01–$40.00	6,842	5.07	$	36.55	4,773	$	36.06
$40.01–$50.00	4,136	8.74	$	46.32	787	$	46.62
$50.01–$60.00	1,713	7.16	$	53.78	874	$	54.35
$60.01–$70.00	80	9.08	$	65.54	14	$	63.20
$70.01-$80.00	87	9.31	$	77.55	9	$	77.73
$80.01–$88.18	1,384	9.50	$	83.11	249	$	82.13
Total	15,729	6.67	$	44.40	7,950	$	38.84

Restricted stock activity

The following table summarizes the restricted stock activity of the Company during the year ended December 31, 2013:

	Restricted Stock		Weighted-average Grant-date Fair Value
	(in thousands)		(per share)
Unvested at December 31, 2012	2,270		$	42.92
Granted	1,356		$	62.16
Vested	(800	)	$	42.27
Cancelled	(780	)	$	51.47
Unvested at December 31, 2013	2,046		$	52.66

Shares issued under Employee Stock Purchase Plan

In 2013, the following shares were issued to employees under the ESPP:

	Year Ended December 31, 2013
	(in thousands, except per share amount)
Number of shares	527
Average price paid per share	$	36.21

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Contingencies

12 Months Ended

Dec. 31, 2013

Commitments and Contingencies Disclosure [Abstract]

Contingencies

Contingencies

The Company has certain contingent liabilities that arise in the ordinary course of its business activities. The Company accrues a reserve for contingent liabilities when it is probable that future expenditures will be made and such expenditures can be reasonably estimated. There were no material contingent liabilities accrued as of December 31, 2013 or 2012.

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Legal Proceedings

12 Months Ended

Dec. 31, 2013

Legal Proceedings [Abstract]

Legal Proceedings

Legal Proceedings

On September 6, 2012, a purported shareholder class action, City of Bristol Pension Fund v. Vertex Pharmaceuticals Incorporated, et al., was filed in the United States District Court for the District of Massachusetts, naming the Company and certain of the Company's current and former officers and directors as defendants. The lawsuit alleges that the Company made material misrepresentations and/or omissions of material fact in the Company's disclosures during the period from May 7, 2012 through June 28, 2012, all in violation of Section 10(b) of the Securities Exchange Act of 1934, as amended, and Rule 10b-5 promulgated thereunder. By order dated December 12, 2012, the court appointed the City of Bristol lead plaintiff and appointed the City of Bristol's attorneys lead counsel. The plaintiffs filed an amended complaint on February 11, 2013. The Company filed a motion to dismiss the complaint on April 12, 2013. On May 28, 2013, the plaintiffs filed an opposition to the Company's motion to dismiss the complaint. On June 27, 2013, the Company filed a reply in further support of the Company's motion to dismiss the plaintiffs' complaint. The court conducted a hearing on the Company's motion to dismiss on November 25, 2013. The plaintiffs seek unspecified monetary damages on behalf of the putative class and an award of costs and expenses, including attorney's fees, as well as disgorgement of the proceeds from certain individual defendants' sales of the Company's common stock. The Company believes that this action is without merit and intends to defend it vigorously. As of December 31, 2013, the Company has not recorded any reserves for this purported class action.

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Net Income (Loss) Per Share Attributable to Vertex Common Shareholders (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Basic net income (loss) attributable to Vertex per common share calculation:
Net income (loss) attributable to Vertex common shareholders	$ 44,285	$ (124,132)	$ (57,165)	$ (308,016)	$ (76,148)	$ (57,543)	$ (64,931)	$ 91,590	$ (445,028)	$ (107,032)	$ 29,574
Less: Undistributed earnings allocated to participating securities									0	0	(291)
Net income (loss) attributable to Vertex common shareholders—basic									(445,028)	(107,032)	29,283
Weighted-average shares used to compute basic net income (loss) per common share (shares)	231,264	230,505	222,053	215,421	214,607	213,767	211,344	208,018	224,906	211,946	204,891
Basic net income (loss) attributable to Vertex per common share (usd per share)	$ 0.19	$ (0.54)	$ (0.26)	$ (1.43)	$ (0.35)	$ (0.27)	$ (0.31)	$ 0.44	$ (1.98)	$ (0.50)	$ 0.14
Diluted net income (loss) attributable to Vertex per common share calculation:
Net income (loss) attributable to Vertex common shareholders	44,285	(124,132)	(57,165)	(308,016)	(76,148)	(57,543)	(64,931)	91,590	(445,028)	(107,032)	29,574
Less: Undistributed earnings allocated to participating securities									0	0	(285)
Net income (loss) attributable to Vertex common shareholders—diluted									$ (445,028)	$ (107,032)	$ 29,289
Weighted-average shares used to compute basic net income (loss) per common share (shares)	231,264	230,505	222,053	215,421	214,607	213,767	211,344	208,018	224,906	211,946	204,891
Effect of potentially dilutive securities:
Stock options (shares)									0	0	3,863
Other (shares)									0	0	53
Weighted-average shares used to compute diluted net income (loss) per common share (shares)	235,717	230,505	222,053	215,421	214,607	213,767	211,344	219,264	224,906	211,946	208,807
Diluted net income (loss) attributable to Vertex per common share (usd per share)	$ 0.19	$ (0.54)	$ (0.26)	$ (1.43)	$ (0.35)	$ (0.27)	$ (0.31)	$ 0.43	$ (1.98)	$ (0.50)	$ 0.14
Stock options
Effect of potentially dilutive securities:
Antidilutive securities excluded from computation of earnings per share (in shares)									15,729	19,726	9,626
Convertible senior subordinated notes
Effect of potentially dilutive securities:
Antidilutive securities excluded from computation of earnings per share (in shares)									0	8,192	8,192
Unvested restricted stock and restricted stock units
Effect of potentially dilutive securities:
Antidilutive securities excluded from computation of earnings per share (in shares)									2,165	2,350	8

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Stock-based Compensation Expense (Tables)

12 Months Ended

Dec. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-based compensation expense by line item

The effect of stock-based compensation expense during the three years ended December 31, 2013 was as follows:

	2013		2012		2011
	(in thousands)
Stock-based compensation expense by line item:
Research and development expenses	$	81,467	$	71,533	$	75,574
Sales, general and administrative expenses	45,836		42,752		42,652
Total stock-based compensation expense included in costs and expenses	$	127,303	$	114,285	$	118,226

Stock-based compensation expense by type of award

The stock-based compensation expense by type of award during the three years ended December 31, 2013 was as follows:

	2013			2012			2011
	(in thousands)
Stock-based compensation expense by type of award:
Stock options	$	85,067		$	79,047		$	83,098
Restricted stock and restricted stock units	36,479			29,194			30,708
ESPP share issuances	6,805			7,298			5,462
Less: stock-based compensation expense capitalized to inventories	(1,048		)	(1,254		)	(1,042		)
Total stock-based compensation expense included in costs and expenses	$	127,303		$	114,285		$	118,226

Unrecognized stock-based compensation expense, net of estimated forfeitures

The following table sets forth the Company’s unrecognized stock-based compensation expense, net of estimated forfeitures, as of December 31, 2013, by type of award and the weighted-average period over which that expense is expected to be recognized:

	As of December 31, 2013
	Unrecognized Expense Net of Estimated Forfeitures		Weighted-average Recognition Period
	(in thousands)		(in years)
Type of award:
Stock options	$	141,283	2.56
Restricted stock and restricted stock units	$	73,490	2.47
ESPP share issuances	$	5,956	0.67

Schedule of assumptions used to estimate the grant date fair value of options

The fair value of each option granted during 2013, 2012 and 2011 was estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:

	2013		2012		2011
Expected stock price volatility	46.20	%	47.93	%	49.53	%
Risk-free interest rate	1.25	%	0.95	%	2.09	%
Expected term of options (in years)	5.81		5.78		5.74
Expected annual dividends	—		—		—

Schedule of assumptions used to estimate the grant date fair value employee stock purchase plan

The following table reflects the weighted-average assumptions used in the Black-Scholes option pricing model for 2013, 2012 and 2011:

	2013		2012		2011
Expected stock price volatility	54.69	%	46.90	%	51.32	%
Risk-free interest rate	0.08	%	0.16	%	0.08	%
Expected term (in years)	0.74		0.74		0.72
Expected annual dividends	—		—		—

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Guarantees

12 Months Ended

Dec. 31, 2013

Guarantees [Abstract]

Guarantees

Guarantees

As permitted under Massachusetts law, the Company’s Articles of Organization and By-laws provide that the Company will indemnify certain of its officers and directors for certain claims asserted against them in connection with their service as an officer or director. The maximum potential amount of future payments that the Company could be required to make under these indemnification provisions is unlimited. However, the Company has purchased directors’ and officers’ liability insurance policies that could reduce its monetary exposure and enable it to recover a portion of any future amounts paid. No indemnification claims currently are outstanding, and the Company believes the estimated fair value of these indemnification arrangements is minimal.

The Company customarily agrees in the ordinary course of its business to indemnification provisions in agreements with clinical trial investigators and sites in its drug development programs, sponsored research agreements with academic and not-for-profit institutions, various comparable agreements involving parties performing services for the Company, and its real estate leases. The Company also customarily agrees to certain indemnification provisions in its drug discovery, development and commercialization collaboration agreements. With respect to the Company’s clinical trials and sponsored research agreements, these indemnification provisions typically apply to any claim asserted against the investigator or the investigator’s institution relating to personal injury or property damage, violations of law or certain breaches of the Company’s contractual obligations arising out of the research or clinical testing of the Company’s compounds or drug candidates. With respect to lease agreements, the indemnification provisions typically apply to claims asserted against the landlord relating to personal injury or property damage caused by the Company, to violations of law by the Company or to certain breaches of the Company’s contractual obligations. The indemnification provisions appearing in the Company’s collaboration agreements are similar to those for the other agreements discussed above, but in addition provide some limited indemnification for its collaborator in the event of third-party claims alleging infringement of intellectual property rights. In each of the cases above, the indemnification obligation generally survives the termination of the agreement for some extended period, although the Company believes the obligation typically has the most relevance during the contract term and for a short period of time thereafter. The maximum potential amount of future payments that the Company could be required to make under these provisions is generally unlimited. The Company has purchased insurance policies covering personal injury, property damage and general liability that reduce its exposure for indemnification and would enable it in many cases to recover all or a portion of any future amounts paid. The Company has never paid any material amounts to defend lawsuits or settle claims related to these indemnification provisions. Accordingly, the Company believes the estimated fair value of these indemnification arrangements is minimal.

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Segment Information

12 Months Ended

Dec. 31, 2013

Segment Reporting [Abstract]

Segment Information

Segment Information

The Company operates in one segment, pharmaceuticals. Enterprise-wide disclosures about revenues, significant customers, and property and equipment, net by location are presented below.

Revenues by Product

Product revenues, net consisted of the following:

	2013		2012		2011
	(in thousands)
INCIVEK	$	466,360	$	1,161,813	$	950,889
KALYDECO	371,285		171,645		—
Total product revenues, net	$	837,645	$	1,333,458	$	950,889

Revenues by Geographic Location

Total revenues from external customers and collaborators by geographic region consisted of the following. Product revenues are attributed to countries based on the location of the customer. Collaborative revenues are attributed to the operations of the Company in the United States. Royalty revenues are attributed to countries based on the location of the collaborator.

	2013		2012		2011
	(in thousands)
United States	$	896,952	$	1,373,516	$	1,389,568
Outside of the United States
Europe	279,557		129,786		20,289
Other	35,466		23,740		769
Total revenues outside of the United States	315,023		153,526		21,058
Total revenues	$	1,211,975	$	1,527,042	$	1,410,626

Significant Customers

Gross revenues and accounts receivable from each of the Company’s customers who individually accounted for 10% or more of total gross revenues and/or 10% or more of total gross accounts receivable consisted of the following:

	Percent of Total Gross Revenues						Percent of Gross Accounts Receivable
	Year Ended December 31,						As of December 31,
	2013		2012		2011		2013		2012
Janssen	22	%	<10	%	19	%	28	%	26	%
AmerisourceBergen Drug Corporation	21	%	32	%	25	%	<10	%	22	%
McKesson Corporation	21	%	29	%	24	%	<10	%	26	%
Cardinal Health Incorporated	<10	%	15	%	15	%	<10	%	<10	%
Bupa Home Healthcare Limited	<10	%	N/A		N/A		14	%	N/A

Property and Equipment, Net by Location

Property and equipment, net by location consisted of the following:

	As of December 31,
	2013		2012
	(in thousands)
United States	$	657,587	$	400,102
Outside of the United States
United Kingdom	29,970		30,622
Other	9,354		2,885
Total property and equipment, net outside of the United States	39,324		33,507
Total property and equipment, net	$	696,911	$	433,609

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Nature of Business and Accounting Policies

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Nature of Business and Accounting Policies

Nature of Business and Accounting Policies

Business

Vertex Pharmaceuticals Incorporated (“Vertex” or the “Company”) is in the business of discovering, developing, manufacturing and commercializing small molecule drugs for patients with serious diseases in specialty markets. The Company's two products are: KALYDECO (ivacaftor), which the Company markets in the United States and international markets for the treatment of patients six years of age and older with cystic fibrosis (“CF”), who have the G551D mutation in their cystic fibrosis transmembrane conductance regulator (“CFTR”) gene, and INCIVEK (telaprevir), which is approved in the United States and Canada for the treatment of adults with genotype 1 hepatitis C virus (“HCV”) infection.

The Company began recognizing net product revenues from sales of INCIVEK and KALYDECO in the second quarter of 2011 and first quarter of 2012, respectively. The Company’s collaborator, Janssen Pharmaceutica NV (“Janssen”), began marketing telaprevir in its territories under the brand name INCIVO in September 2011. The Company’s net loss attributable to Vertex for 2013 was $445.0 million, or $1.98 per share. As of December 31, 2013, the Company had cash, cash equivalents and marketable securities of approximately $1.47 billion. The Company expects that cash flows from the sales of its products, together with the Company’s cash, cash equivalents and marketable securities, will be sufficient to fund its operations for at least the next twelve months.

Vertex is subject to risks common to companies in its industry including, but not limited to, the dependence on revenues from KALYDECO, competition, uncertainty about clinical trial outcomes and regulatory approvals, uncertainties relating to pharmaceutical pricing and reimbursement, rapid technological change, uncertain protection of proprietary technology, the need to comply with government regulations, share price volatility, dependence on collaborative relationships and potential product liability.

Basis of Presentation

The consolidated financial statements reflect the operations of (i) the Company and (ii) its wholly-owned subsidiaries. In addition, the consolidated financial statements for the period from June 13, 2011 through December 31, 2013, reflect the operations of Alios BioPharma, Inc. (“Alios”), a collaborator that is a variable interest entity (a “VIE”) for which the Company was deemed under applicable accounting guidance to have a variable interest and be the primary beneficiary. As of December 31, 2013, the Company deconsolidated Alios, and the Company's consolidated balance sheet as of December 31, 2013 excludes Alios. All material intercompany balances and transactions have been eliminated. The Company operates in one segment, pharmaceuticals. Please refer to Note X, "Segment Information," for enterprise-wide disclosures regarding the Company’s revenues, major customers and long-lived assets by geographic area.

Use of Estimates

The preparation of consolidated financial statements in accordance with accounting principles generally accepted in the United States of America (“GAAP”) requires management to make certain estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements, and the amounts of revenues and expenses during the reported periods. Significant estimates in these consolidated financial statements have been made in connection with the calculation of revenues, inventories, research and development expenses, stock-based compensation expense, restructuring expense, the fair value of intangible assets, noncontrolling interest (Alios), the consolidation and deconsolidation of a VIE, leases and the income tax provision. The Company bases its estimates on historical experience and various other assumptions, including in certain circumstances future projections, that management believes to be reasonable under the circumstances. Actual results could differ from those estimates. Changes in estimates are reflected in reported results in the period in which they become known.

Revenue Recognition

Product Revenues, Net

The Company sells its products principally to a limited number of major and selected regional wholesalers and specialty pharmacy providers in North America as well as government-owned and supported customers in Europe (collectively, its “Customers”). The Company's Customers in North America subsequently resell the products to patients and health care providers. The Company recognizes net revenues from product sales upon delivery as long as (i) there is persuasive evidence that an arrangement exists between the Company and the Customer, (ii) collectibility is reasonably assured and (iii) the price is fixed or determinable.

In order to conclude that the price is fixed or determinable, the Company must be able to (i) calculate its gross product revenues from sales to Customers and (ii) reasonably estimate its net product revenues upon delivery to its Customer's locations. The Company calculates gross product revenues based on the price that the Company charges its Customers. The Company estimates its net product revenues by deducting from its gross product revenues (a) trade allowances, such as invoice discounts for prompt payment and Customer fees, (b) estimated government and private payor rebates, chargebacks and discounts, (c) estimated reserves for expected product returns and (d) estimated costs of incentives offered to certain indirect customers, including patients.

The Company makes significant estimates and judgments that materially affect the Company’s recognition of net product revenues. In certain instances, the Company may be unable to reasonably conclude that the price is fixed or determinable at the time of delivery, in which case it defers the recognition of revenues. Once the Company is able to determine that the price is fixed or determinable, it recognizes the revenues associated with the units in which revenue recognition was deferred.

Trade Allowances: The Company generally provides invoice discounts on product sales to its Customers for prompt payment and pays fees for distribution services, such as fees for certain data that Customers provide to the Company. The payment terms for sales to Customers in the United States generally include a 2% discount for payment within 30 days. The Company expects that, based on its experience, its Customers will earn these discounts and fees, and deducts the full amount of these discounts and fees from its gross product revenues and accounts receivable at the time such revenues are recognized.

Rebates, Chargebacks and Discounts: The Company contracts with government agencies and various private organizations (collectively, its “Third-party Payors”) so that products will be eligible for purchase by, or partial or full reimbursement from, such Third-party Payors. The Company estimates the rebates, chargebacks and discounts it will provide to Third-party Payors and deducts these estimated amounts from its gross product revenues at the time the revenues are recognized. For each product, the Company estimates the aggregate rebates, chargebacks and discounts that it will provide to Third-party Payors based upon (i) the Company’s contracts with these Third-party Payors, (ii) the government-mandated discounts applicable to government-funded programs, (iii) information obtained from the Company’s Customers regarding the payor mix for such product and (iv) historical experience.

Product Returns: The Company estimates the amount of each product that will be returned and deducts these estimated amounts from its gross revenues at the time the revenues are recognized. The Company’s Customers have the right to return unopened unprescribed packages, subject to contractual limitations. To date product returns have been minimal and, based on inventory levels held by its Customers and its distribution model, the Company believes that returns of its products will continue to be minimal.

Other Incentives: Other incentives that the Company offers include co-pay mitigation rebates provided by the Company to commercially insured patients who have coverage and who reside in states that permit co-pay mitigation programs. The Company’s co-pay mitigation programs are intended to reduce each participating patient’s portion of the financial responsibility for a product’s purchase price to a specified dollar amount. Based upon the terms of the Company's co-pay mitigation programs, the Company estimates average co-pay mitigation amounts for each of its products in order to establish its accruals for co-pay mitigation rebates and deducts these estimated amounts from its gross product revenues at the later of the date (i) the revenues are recognized or (ii) the incentive is offered. The Company’s co-pay mitigation rebates are subject to expiration.

The following table summarizes activity in each of the product revenue allowance and reserve categories for the three years ended December 31, 2013:

	Trade Allowances			Rebates, Chargebacks and Discounts			Product Returns			Other Incentives			Total
	(in thousands)
2013
Beginning Balance	$	5,416		$	63,560		$	2,852		$	3,565		$	75,393
Provision related to current period sales	31,395			204,459			5,795			9,295			250,944
Adjustments related to prior period sales	343			4,474			15,149			(228		)	19,738
Credits/payments made	(35,619		)	(204,249		)	(7,997		)	(11,077		)	(258,942		)
Ending Balance	$	1,535		$	68,244		$	15,799		$	1,555		$	87,133
2012
Beginning Balance	$	11,162		$	52,659		$	340		$	5,202		$	69,363
Provision related to current period sales	55,913			216,942			2,067			19,103			294,025
Adjustments related to prior period sales	29			3,883			1,498			72			5,482
Credits/payments made	(61,688		)	(209,924		)	(1,053		)	(20,812		)	(293,477		)
Ending Balance	$	5,416		$	63,560		$	2,852		$	3,565		$	75,393
2011
Beginning Balance	$	—		$	—		$	—		$	—		$	—
Provision related to current period sales	38,228			75,145			553			9,692			123,618
Credits/payments made	(27,066		)	(22,486		)	(213		)	(4,490		)	(54,255		)
Ending Balance	$	11,162		$	52,659		$	340		$	5,202		$	69,363

Based on the current information available to the Company, cumulative adjustments related to prior period sales represent 0.7% and 1.3%, respectively, of the gross product revenues that were recorded in the years ended December 31, 2012 and 2011.

Royalty Revenues

The Company’s royalty revenues on commercial sales of INCIVO (telaprevir) by Janssen are based on net sales of licensed products in licensed territories as provided by Janssen. The Company recognizes royalty revenues in the period the sales occur.

The Company has sold its rights to receive certain royalties on sales of an HIV protease inhibitor (fosamprenavir) and recognizes the revenues related to this sale as royalty revenues. In the circumstance where the Company has sold its rights to future royalties under a license agreement and also maintains continuing involvement in the royalty arrangement (but not significant continuing involvement in the generation of the cash flows payable to the purchaser of the future royalty rights), the Company defers recognition of the proceeds it receives for the royalty stream and recognizes these deferred revenues over the life of the license agreement pursuant to the units-of-revenue method. The Company’s estimates regarding the estimated remaining royalty payments due to the purchaser have changed in the past and may change in the future.

Collaborative Revenues

The Company recognizes revenues generated through collaborative research, development and/or commercialization agreements. The terms of these agreements typically include payment to the Company of one or more of the following: nonrefundable, up-front license fees; development and commercial milestone payments; funding of research and/or development activities; payments for services the Company provides through its third-party manufacturing network; and royalties on net sales of licensed products. Each of these types of payments results in collaborative revenues, except for revenues from royalties on net sales of licensed products, which are classified as royalty revenues.

For each collaborative research, development and/or commercialization agreement that result in revenues, the Company determines (i) whether multiple deliverables exist, (ii) whether the undelivered elements have value to the customer on a stand-alone basis, (iii) how the deliverables should be separated and (iv) how the consideration should be allocated to the deliverables. For arrangements entered into or materially modified after January 1, 2011, the Company allocates consideration in an arrangement using the relative selling price method based on management’s best estimate of selling price of deliverables if it does not have vendor-specific objective evidence or third-party evidence. As part of the accounting for these agreements, the Company must develop assumptions that require judgment to determine the best estimate of selling price. Key assumptions utilized by the Company to determine the best estimate of selling price may include patient enrollment requirements from regulatory authorities, development timelines, reimbursement rates for personnel costs, discount rates, and estimated third-party development costs.

The Company evaluates amendments to its existing arrangements to determine whether they have been materially modified. In making its determination that an arrangement has been materially modified, the Company considers whether there have been significant changes to the consideration under the arrangement, the deliverables under the arrangement, the timing of deliverables and the period of the arrangement. If the arrangement is determined to have been materially modified, the Company allocates fixed consideration under the arrangement using its best estimate of selling price to the remaining undelivered elements at the date of material modification. Any consideration remaining after the allocation is recognized as revenue.

Collaborative research, development and/or commercialization agreements entered into prior to January 1, 2011 that contained multiple elements of revenue were divided into separate units of accounting if certain criteria were met, including whether the delivered element had stand-alone value to the collaborator and whether there was objective and reliable evidence of the fair value of the undelivered obligation(s). The Company allocated consideration it received among the separate units either on the basis of each unit’s fair value or using the residual method, and applied the revenue recognition criteria to each of the separate units.

Up-front License Fees: If the license to the Company's intellectual property was determined to have stand-alone value from the other deliverables identified in the arrangement, the Company recognized revenues from nonrefundable, up-front license fees upon delivery. If these licenses did not have stand-alone value, the Company recognized revenues from nonrefundable, up-front license fees on a straight-line basis over the contracted or estimated period of performance. The Company evaluated the period of performance each reporting period and adjusted the period of performance on a prospective basis if there were changes to be made.

Milestone Payments: At the inception of each agreement that included research and development milestone payments, the Company evaluated whether each milestone was substantive. The Company recognized revenues related to substantive milestones in full in the period in which the substantive milestone was achieved if payment was reasonably assured. If a milestone was not considered substantive, the Company recognized the applicable milestone payment over the period of performance.

Research and Development Activities/Manufacturing Services: If the Company was entitled to reimbursement from its collaborators for specified research and development expenses and/or was entitled to payments for specified manufacturing services that the Company provided through its third-party manufacturing network, the Company determined whether the research and development funding would result in collaborative revenues or an offset to research and development expenses.

Concentration of Credit Risk

Financial instruments that potentially subject the Company to concentration of credit risk consist principally of money market funds and marketable securities. The Company places these investments with highly rated financial institutions, and, by policy, limits the amounts of credit exposure to any one financial institution. These amounts at times may exceed federally insured limits. The Company has not experienced any credit losses in these accounts and does not believe it is exposed to any significant credit risk on these funds. The Company implemented a foreign exchange hedging program in December 2013. As of December 31, 2013, the notional amount and fair value of these hedges was not significant.

The Company also is subject to credit risk from its accounts receivable related to its product sales and collaborators. The Company evaluates the creditworthiness of each of its customers and has determined that all of its material customers are creditworthy. To date, the Company has not experienced significant losses with respect to the collection of its accounts receivable. The Company's receivables from Greece and Italy were not material in 2013, and the Company had no receivables from Spain or Portugal in 2013. The Company believes that its allowance for doubtful accounts was adequate at December 31, 2013. Please refer to Note X, "Segment Information," for further information.

Cash and Cash Equivalents

The Company considers all highly liquid investments with original maturities of three months or less at the date of purchase to be cash equivalents.

Restricted Cash

Restricted cash consists of balances held in deposit with certain banks to collateralize conditional stand-by letters of credit in the names of the Company’s landlords pursuant to certain operating lease agreements. The Company also separately disclosed on its consolidated balance sheet restricted cash and cash equivalents (Alios) as of December 31, 2012. The Company deconsolidated Alios as of December 31, 2013. Please refer to Note B, "Collaborative Arrangements," for further information.

Marketable Securities

The Company's marketable securities consist of investments in government-sponsored enterprise securities, corporate debt securities and commercial paper that are classified as available-for-sale. The Company classifies marketable securities available to fund current operations as current assets on its consolidated balance sheets. Marketable securities are classified as long-term assets on the consolidated balance sheets if (i) they have been in an unrealized loss position for longer than one year and (ii) the Company has the ability and intent to hold them (a) until the carrying value is recovered and (b) such holding period may be longer than one year. The Company's marketable securities are stated at fair value with their unrealized gains and losses included as a component of accumulated other comprehensive loss, which is a separate component of shareholders’ equity, until such gains and losses are realized. The fair value of these securities is based on quoted prices for identical or similar assets.

The Company reviews investments in marketable securities for other-than-temporary impairment whenever the fair value of an investment is less than the amortized cost and evidence indicates that an investment’s carrying amount is not recoverable within a reasonable period of time. To determine whether an impairment is other-than-temporary, the Company considers whether it has an intent to sell, or whether it is more likely than not that the Company will be required to sell, the investment before recovery of the investment’s amortized cost basis. Evidence considered in this assessment includes reasons for the impairment, compliance with the Company’s investment policy, the severity and the duration of the impairment and changes in value subsequent to year-end. If a decline in the fair value is considered other-than-temporary, based on available evidence, the unrealized loss is transferred from other comprehensive income (loss) to the consolidated statements of operations.

There were no charges recorded for other-than-temporary declines in fair value of marketable securities in 2013, 2012 or 2011. Realized gains and losses are determined using the specific identification method and are included in other income (expense), net in the consolidated statements of operations. There were no gross realized gains or losses recognized in 2013, 2012 or 2011.

Stock-based Compensation Expense

The Company expenses the fair value of employee stock options and other forms of stock-based employee compensation over the associated employee service period on a straight-line basis. For awards with performance conditions, the Company estimates the likelihood of satisfaction of the performance conditions, which affects the period over which the expense is recognized, and recognizes the expense using the accelerated attribution model. Stock-based compensation expense is determined based on the fair value of the award at the grant date, including estimated forfeitures, and is adjusted each period to reflect actual forfeitures and the outcomes of certain performance conditions.

Research and Development Expenses

The Company expenses as incurred all research and development expenses, including amounts funded by research and development collaborations. The Company capitalizes nonrefundable advance payments made by the Company for research and development activities and expenses the payments as the related goods are delivered or the related services are performed.

Research and development expenses are comprised of costs incurred by the Company in performing research and development activities, including salary and benefits; stock-based compensation expense; laboratory supplies and other direct expenses; contractual services costs, including clinical trial and pharmaceutical development costs; expenses associated with drug supplies that are not being capitalized; and infrastructure costs, including facilities costs and depreciation expense.

Advertising Expenses

The Company expenses the costs of advertising, including promotional expenses, as incurred. Advertising expenses, recorded in sales, general and administrative expenses, were $19.6 million, $58.6 million and $30.8 million in 2013, 2012 and 2011, respectively.

Inventories

The Company values its inventories at the lower-of-cost or market. The Company determines the cost of its inventories, which includes amounts related to materials and manufacturing overhead, on a first-in, first-out basis. The Company performs an assessment of the recoverability of capitalized inventory during each reporting period, and writes down any excess and obsolete inventories to their realizable value in the period in which the impairment is first identified. Shipping and handling costs incurred for inventory purchases are capitalized and recorded upon sale in cost of product revenues in the consolidated statements of operations. Shipping and handling costs incurred for product shipments are recorded as incurred in cost of product revenues in the consolidated statements of operations.

The Company capitalizes inventories produced in preparation for initiating sales of a drug candidate when the related drug candidate is considered to have a high likelihood of regulatory approval and the related costs are expected to be recoverable through sales of the inventories. In determining whether or not to capitalize such inventories, the Company evaluates, among other factors, information regarding the drug candidate’s safety and efficacy, the status of regulatory submissions and communications with regulatory authorities and the outlook for commercial sales, including the existence of current or anticipated competitive drugs and the availability of reimbursement. In addition, the Company evaluates risks associated with manufacturing the drug candidate and the remaining shelf-life of the inventories.

Property and Equipment

Property and equipment are recorded at cost. Depreciation expense is recorded using the straight-line method over the estimated useful life of the related asset, generally seven to ten years for furniture and equipment, three to five years for computers and software, 40 years for buildings and for leasehold improvements, the useful life of the improvements or the estimated remaining life of the associated lease. Maintenance and repairs to an asset that do not improve or extend its life are charged to operations. When assets are retired or otherwise disposed of, the assets and related accumulated depreciation are eliminated from the accounts and any resulting gain or loss is reflected in the Company’s consolidated statements of operations. The Company performs an assessment of the fair value of the assets if indicators of impairment are identified during a reporting period and records the assets at the lower of the net book value or the fair value of the assets.

The Company capitalizes internal costs incurred to develop software for internal use during the application development stage. The Company expenses costs related to the planning and post-implementation phases of development of software for internal use as these costs are incurred. Maintenance and enhancement costs (including costs in the post-implementation stages) are expensed as incurred, unless such costs relate to substantial upgrades and enhancements to the software resulting in added functionality, in which case the costs are capitalized. Amortization of capitalized internally developed software costs is recorded in depreciation expense over the useful life of the related asset.

The Company records certain construction costs incurred by a landlord as an asset and corresponding financing obligation on the Company's consolidated balance sheets as the owner of the buildings for accounting purposes.

Capital Leases

The assets and liabilities associated with capital lease agreements are recorded at the present value of the minimum lease payments at the inception of the lease agreement. The assets are amortized using the straight-line method over the estimated useful life of the related asset or the remaining life of the associated lease. Amortization of assets that the Company leases pursuant to a capital lease is included in depreciation expense. The Company performs an assessment of the fair value of the assets if indicators of impairment are identified during a reporting period and records the assets at the lower of the net book value or the fair value of the assets. Assets recorded under capital leases are recorded within "Property and equipment, net" and liabilities related to those assets are recorded within "Capital lease obligations, current portion" and "Capital lease obligations, excluding current portion," on the Company's consolidated balance sheets.

Income Taxes    

Deferred tax assets and liabilities are recognized for the expected future tax consequences of temporary differences between the financial statement carrying amounts and the income tax bases of assets and liabilities. A valuation allowance is applied against any net deferred tax asset if, based on the available evidence, it is more likely than not that some or all of the deferred tax assets will not be realized.

The Company records liabilities related to uncertain tax positions by prescribing a minimum recognition threshold and measurement attribute for the financial statement recognition and measurement of a tax position taken or expected to be taken in a tax return. The Company does not believe any such uncertain tax positions currently pending will have a material adverse effect on its consolidated financial statements.

Variable Interest Entities

The Company reviews each collaboration agreement pursuant to which the Company licenses assets owned by a collaborator in order to determine whether or not the collaborator is a VIE. If the collaborator is a VIE, the Company assesses whether or not the Company is the primary beneficiary of that VIE based on a number of factors, including (i) which party has the power to direct the activities that most significantly affect the VIE’s economic performance, (ii) the parties’ contractual rights and responsibilities pursuant to the collaboration agreement and (iii) which party has the obligation to absorb losses or the right to receive benefits from the VIE. If the Company determines it is the primary beneficiary of a VIE at the onset of the collaboration agreement, the collaboration is treated as a business combination and the Company consolidates the financial statements of the VIE into the Company’s consolidated financial statements. The Company evaluates whether it continues to be the primary beneficiary of any consolidated VIEs on a quarterly basis. If the Company determines that it is no longer the primary beneficiary of a consolidated VIE, or no longer has a variable interest in the VIE, it deconsolidates the VIE in the period that the determination is made.

Business Combinations

The Company assigns the value of consideration, including contingent consideration, transferred in business combinations to the appropriate accounts on the Company's consolidated balance sheet based on their fair value as of the effective date of the transaction. If a collaboration has been treated as a business combination and there are contingent payments, increases in the fair value of the contingent payments pursuant to collaborations accounted for as business combinations result in a decrease in net income attributable to Vertex (or an increase in net loss attributable to Vertex) on a dollar-for-dollar basis. Transaction costs and any restructuring costs associated with these transactions are expensed as incurred.

Fair Value of In-process Research and Development Assets and Contingent Payments in Business Combinations

The present-value models used to estimate the fair values of research and development assets and contingent payments pursuant to collaborations incorporate significant assumptions, including: assumptions regarding the probability of obtaining marketing approval and/or achieving relevant development milestones for a drug candidate; estimates regarding the timing of and the expected costs to develop a drug candidate; estimates of future cash flows from potential product sales and/or the potential to achieve certain commercial milestones with respect to a drug candidate; and the appropriate discount and tax rates.

In-process Research and Development Assets

The Company records the fair value of in-process research and development assets as of the transaction date of a business combination. Each of these assets is accounted for as an indefinite-lived intangible asset and is maintained on the Company’s consolidated balance sheet until either the project underlying it is completed or the asset becomes impaired. If the asset becomes impaired or is abandoned, the carrying value of the related intangible asset is written down to its fair value, and an impairment charge is recorded in the period in which the impairment occurs. If a project is completed, the carrying value of the related intangible asset is amortized as a part of cost of product revenues over the remaining estimated life of the asset beginning in the period in which the project is completed. In-process research and development assets are tested for impairment on an annual basis as of October 1, and more frequently if indicators are present or changes in circumstances suggest that impairment may exist.

Goodwill

The difference between the purchase price and the fair value of assets acquired and liabilities assumed in a business combination is allocated to goodwill. Goodwill is evaluated for impairment on an annual basis as of October 1, and more frequently if indicators are present or changes in circumstances suggest that impairment may exist.

Deconsolidation and Discontinued Operations

Upon the occurrence of certain events and on a regular basis, the Company evaluates whether it no longer has a controlling financial interest in its subsidiaries, including deemed subsidiaries such as consolidated VIEs. If it is determined that the Company no longer has a controlling interest, the subsidiary is deconsolidated. The Company records a gain or loss on deconsolidation based on the difference on the deconsolidation date between (i) the aggregate of (a) the fair value of any consideration received, (b) the fair value of any retained noncontrolling investment in the former subsidiary and (c) the carrying amount of any noncontrolling interest in the subsidiary being deconsolidated, less (ii) the carrying amount of the former subsidiary’s assets and liabilities.

The Company assesses whether a deconsolidation is required to be presented as discontinued operations in its consolidated financial statements on the deconsolidation date. This assessment is based on whether or not (i) the operations and cash flows to the former subsidiary have been or will be eliminated from the Company's ongoing operations as a result of the deconsolidation event and (ii) the Company will have any significant continuing involvement in the operations of the former subsidiary after the deconsolidation event. If the Company determines that a deconsolidation requires presentation as a discontinued operation on the deconsolidation date, or at any point during the one year period following such date, it will present the former subsidiary as a discontinued operation in current and comparative period financial statements.

Derivative Instruments, Embedded Derivatives and Hedging Activities

The Company has entered into financial transactions involving free-standing derivative instruments and embedded derivatives in the past. Embedded derivatives are required to be bifurcated from the host instruments because the derivatives are not clearly and closely related to the host instruments. The Company determines the fair value of each derivative instrument or embedded derivative that is identified on the date of issuance and at the end of each quarterly period. The estimates of the fair value of these derivatives, particularly with respect to derivatives related to the achievement of milestones in the development of telaprevir, included significant assumptions regarding the estimates market participants would make in order to evaluate these derivatives.

The Company recognizes the fair value of hedging instruments that are designated and qualify as hedging instruments pursuant to GAAP, primarily foreign currency forward contracts, as either assets or liabilities on the consolidated balance sheets. Changes in the fair value of hedging instruments are recorded each period in accumulated other comprehensive loss until the date of settlement, at which point the cumulative change in the fair value since the inception of the hedge is recognized in "Product revenues, net," in its consolidated statements of operations. The Company classifies the cash flows from hedging instruments in the same category as the cash flows from the hedged items.

The Company assesses, both at inception and on an ongoing basis, whether the foreign currency forward contracts used in hedging transactions are highly effective in offsetting the changes in cash flows of the hedged items. The Company also assesses hedge ineffectiveness quarterly and, if determined to be ineffective, records the gain or loss related to the ineffective portion to earnings in "Other income (expense), net" in the consolidated statements of operations.

Restructuring Expenses

The Company records costs and liabilities associated with exit and disposal activities based on estimates of fair value in the period the liabilities are incurred. In periods subsequent to the initial measurement, the Company measures changes to the liability using the credit-adjusted risk-free discount rate applied in the initial period. The Company evaluates and adjusts these liabilities as appropriate for changes in circumstances at least on a quarterly basis.

Comprehensive Income (Loss)

Comprehensive income (loss) consists of net income (loss) and other comprehensive income (loss), which includes foreign currency translation adjustments and unrealized gains and losses on foreign currency forward contracts and certain marketable securities. For purposes of comprehensive income (loss) disclosures, the Company does not record tax provisions or benefits, as the Company intends to permanently reinvest undistributed earnings in its foreign subsidiaries.

Foreign Currency Translation and Transactions

All material consolidated entities have the U.S. dollar as their functional currency. Non-U.S. dollar functional currency subsidiaries have assets and liabilities translated into U.S. dollars at rates of exchange in effect at the end of the year. Revenue and expense amounts are translated using the average exchange rates for the period. Net unrealized gains and losses resulting from foreign currency translation are included in accumulated other comprehensive loss, which is a separate component of shareholders’ equity. Included in accumulated other comprehensive loss are net unrealized losses related to foreign currency translation of $0.3 million, $0.7 million and $0.9 million at December 31, 2013, 2012, and 2011, respectively. Net foreign currency exchange transaction gains or losses are included in "Net income (loss)" on the Company’s consolidated statement of operations. Net transaction gains were $5.1 million and $0.7 million for 2013 and 2011, respectively, and net transaction losses were $0.4 million in 2012.

Net Income (Loss) Per Share Attributable to Vertex Common Shareholders

Basic and diluted net income per share attributable to Vertex common shareholders are presented in conformity with the two-class method required for participating securities. Under the two-class method, earnings are allocated to (i) Vertex common shares, excluding unvested restricted stock, and (ii) participating securities, based on their respective weighted-average shares outstanding for the period. Shares of unvested restricted stock granted under the Company's Amended and Restated 2006 Stock and Option Plan have the non-forfeitable right to receive dividends on an equal basis with other outstanding common stock. As a result, these unvested shares of restricted stock are considered participating securities under the two-class method. Potentially dilutive shares result from the assumed exercise of outstanding stock options (the proceeds of which are then assumed to have been used to repurchase outstanding stock using the treasury stock method) and the assumed conversion of convertible notes.

Basic net loss per share attributable to Vertex common shareholders is based upon the weighted-average number of common shares outstanding during the period, excluding restricted stock that has been issued but is not yet vested. Diluted net loss per share attributable to Vertex common shareholders is based upon the weighted-average number of common shares outstanding during the period plus additional weighted-average common equivalent shares outstanding during the period when the effect is dilutive.

Recent Accounting Pronouncements

The Company did not adopt any new accounting pronouncements during 2013 that had a material effect on the Company’s consolidated financial statements.

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Quarterly Financial Data (unaudited)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Quarterly Financial Data (unaudited)

Quarterly Financial Data (unaudited)

	Three Months Ended
	March 31, 2013			June 30, 2013			September 30, 2013			December 31, 2013
	(in thousands, except per share amounts)
Revenues:
Product revenues, net	$	267,381		$	254,789		$	186,653		$	128,822
Royalty revenues	43,573			49,120			27,012			36,887
Collaborative revenues (1)	17,414			6,841			8,035			185,448
Total revenues	328,368			310,750			221,700			351,157
Costs and expenses:
Cost of product revenues (2)	30,955			24,695			20,048			13,281
Royalty expenses	11,788			13,236			7,291			8,983
Research and development expenses	218,095			222,455			228,624			249,609
Sales, general and administrative expenses	92,879			106,521			87,754			75,188
Restructuring expenses	39			776			12,048			27,658
Intangible asset impairment charges (3)(4)	412,900			—			—			250,600
Total costs and expenses	766,656			367,683			355,765			625,319
Loss from operations	(438,288		)	(56,933		)	(134,065		)	(274,162		)
Interest expense, net	(3,465		)	(6,551		)	(95		)	(12,619		)
Other income (expense), net (4)	(1,187		)	(27		)	4,747			(53,472		)
Loss before benefit from income taxes	(442,940		)	(63,511		)	(129,413		)	(340,253		)
Benefit from income taxes (3)(4)	(130,313		)	(1,799		)	(751		)	(155,704		)
Net loss	(312,627		)	(61,712		)	(128,662		)	(184,549		)
Net loss attributable to noncontrolling interest (Alios)	4,611			4,547			4,530			228,834
Net income (loss) attributable to Vertex	$	(308,016	)	$	(57,165	)	$	(124,132	)	$	44,285
Net income (loss) per share attributable to Vertex common shareholders:
Basic	$	(1.43	)	$	(0.26	)	$	(0.54	)	$	0.19
Diluted	$	(1.43	)	$	(0.26	)	$	(0.54	)	$	0.19
Shares used in per share calculations:
Basic	215,421			222,053			230,505			231,264
Diluted	215,421			222,053			230,505			235,717

	Three Months Ended
	March 31, 2012			June 30, 2012			September 30, 2012			December 31, 2012
	(in thousands, except per share amounts)
Revenues:
Product revenues, net	$	375,375		$	373,273		$	303,501		$	281,309
Royalty revenues	38,981			33,480			25,586			43,451
Collaborative revenues	24,381			11,552			6,919			9,234
Total revenues	438,737			418,305			336,006			333,994
Costs and expenses:
Cost of product revenues (2)	25,918			104,549			30,680			75,595
Royalty expenses	13,293			9,874			7,856			12,120
Research and development expenses	196,371			196,544			200,161			213,109
Sales, general and administrative expenses	111,146			117,514			97,684			110,452
Restructuring expenses	360			594			696			194
Intangible asset impairment charge	—			—			—			—
Total costs and expenses	347,088			429,075			337,077			411,470
Income (loss) from operations	91,649			(10,770		)	(1,071		)	(77,476		)
Interest expense, net	(3,891		)	(3,814		)	(4,054		)	(3,263		)
Other income (expense), net	150			179			13			(33		)
Income (loss) before provision for (benefit from) income taxes	87,908			(14,405		)	(5,112		)	(80,772		)
Provision for (benefit from) income taxes	32			20,063			21,355			(2,696		)
Net income (loss)	87,876			(34,468		)	(26,467		)	(78,076		)
Net loss (income) attributable to noncontrolling interest (Alios)	3,714			(30,463		)	(31,076		)	1,928
Net income (loss) attributable to Vertex	$	91,590		$	(64,931	)	$	(57,543	)	$	(76,148	)
Net income (loss) per share attributable to Vertex common shareholders:
Basic	$	0.44		$	(0.31	)	$	(0.27	)	$	(0.35	)
Diluted	$	0.43		$	(0.31	)	$	(0.27	)	$	(0.35	)
Shares used in per share calculations:
Basic	208,018			211,344			213,767			214,607
Diluted	219,264			211,344			213,767			214,607

1. During the fourth quarter of 2013, the Company recorded $182.4 million of collaborative revenue related to its Janssen collaboration, which was primarily attributable to an amendment to its collaboration agreement with Janssen. See Note B, "Collaborative Arrangements," for further information.

2. During 2013 and 2012, the Company recorded within cost of product revenues lower-of-cost or market charges for excess or obsolete inventories. See Note G, "Inventories," for further information.

3. During the first quarter of 2013, the Company recorded a $412.9 million intangible asset impairment charge related to its VX-222 indefinite-lived in-process research and development asset. In connection with this impairment charge, the Company recorded a credit of $127.6 million in its provision for income taxes. See Note J, "Intangible Assets and Goodwill," for further information.

4. During the fourth quarter of 2013, the Company deconsolidated Alios, which included certain charges related to deconsolidation recorded in other income (expense), net, and was preceded by a $250.6 million intangible asset impairment charge related to the HCV nucleotide analogue program indefinite-lived in-process research and development asset. In connection with this impairment charge, a credit of $102.1 million was recorded to the provision for income taxes attributable to Alios. See Note B, "Collaborative Arrangements," and Note J, "Intangible Assets and Goodwill," for further information.

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Inventories (Tables)

12 Months Ended

Dec. 31, 2013

Inventory Disclosure [Abstract]

Schedule of Inventories by Type

Inventories consisted of the following:

	As of December 31,
	2013		2012
	(in thousands)
Raw materials	$	489	$	3,754
Work-in-process	9,981		11,317
Finished goods	3,677		15,393
Total	$	14,147	$	30,464

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Nature of Business and Accounting Policies (Details 2) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Sales, General and Administrative Expenses
Advertising Expenses	$ 19.6	$ 58.6	$ 30.8

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Sale of HIV Protease Inhibitor Royalty Stream (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2008	Dec. 31, 2013
Sale of HIV Protease Inhibitor Royalty Stream
Gross proceeds from sale of royalty rights receivable from GlaxoSmithKline	$ 160.0
Deferred revenues related to the one-time cash payment agreement with GlaxoSmithKline		$ 63.5

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Consolidated Statements of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues:
Product revenues, net	$ 837,645	$ 1,333,458	$ 950,889
Royalty revenues	156,592	141,498	50,015
Collaborative revenues (1)	217,738	52,086	409,722
Total revenues	1,211,975	1,527,042	1,410,626
Costs and expenses:
Cost of product revenues	88,979	236,742	63,625
Royalty expenses	41,298	43,143	16,880
Research and development expenses	918,783	806,185	707,706
Sales, general and administrative expenses	362,342	436,796	400,721
Restructuring Expense	40,521	1,844	2,074
Intangible asset impairment charges	663,500	0	105,800
Total costs and expenses	2,115,423	1,524,710	1,296,806
Income (loss) from operations	(903,448)	2,332	113,820
Interest Income (Expense), Net	(22,730)	(15,022)	(37,681)
Other Nonoperating Income (Expense)	(49,939)	309	(15,694)
Income (loss) before provision for (benefit from) income taxes	(976,117)	(12,381)	60,445
Provision for (benefit from) income taxes	(288,567)	38,754	19,266
Net income (loss)	(687,550)	(51,135)	41,179
Net loss (income) attributable to noncontrolling interest (Alios)	242,522	(55,897)	(11,605)
Comprehensive (Income) Loss, Net of Tax, Attributable to Noncontrolling Interest	(242,522)	55,897	11,605
Net income (loss) attributable to Vertex	$ (445,028)	$ (107,032)	$ 29,574
Net income (loss) per share attributable to Vertex common shareholders:
Basic (usd per share)	$ (1.98)	$ (0.50)	$ 0.14
Diluted (usd per share)	$ (1.98)	$ (0.50)	$ 0.14
Shares used in per share calculations:
Basic (shares)	224,906	211,946	204,891
Diluted (shares)	224,906	211,946	208,807

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September 2009 Financial Transactions (Tables)

12 Months Ended

Dec. 31, 2013

September 2009 Financial Transactions

Expenses and Losses (Gains) Related to September 2009 Financial Transactions

The table below sets forth the total expenses related to the September 2009 financial transactions for 2011:

	2011
	(in thousands)
Expenses and Losses (Gains):
Interest expense related to 2012 Notes	$	21,687
Change in fair value of embedded derivative related to 2012 Notes	(400		)
Change in fair value of free-standing derivatives related to the sale of milestone payments	17,201
Total September 2009 financial transaction expenses	$	38,488

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Consolidated Statements of Shareholders' Equity and Noncontrolling Interest (USD $) In Thousands, except Share data, unless otherwise specified	Total		Total Vertex Shareholders' Equity	Common Stock	Additional Paid-in Capital	Accumulated Other Comprehensive Loss	Accumulated Deficit	Noncontrolling Interest (Alios)	Redeemable Noncontrolling Interest (Alios)
Balance at Dec. 31, 2010	$ 503,973		$ 503,973	$ 2,016	$ 3,947,433	$ (1,067)	$ (3,444,409)	$ 0	$ 0
Balance (shares) at Dec. 31, 2010				203,523,000
Increase (Decrease) in Stockholders' Equity
Unrealized holding losses on marketable securities	(119)		(119)			(119)
Unrealized losses on foreign currency forward contracts	0
Foreign currency translation adjustment	133		133			133
Net income (loss) attributable to Vertex common shareholders	29,574
Net income (loss)	41,179		29,574					11,605
Issuances of common stock:
Benefit plans (shares)	183,000			5,781,000
Issuance of common stock under benefit plans	133,393		133,418	56	133,362			(25)
Stock-based compensation expense	119,268		118,964		118,964			304
Tax benefit from equity compensation	900				900
Alios noncontrolling interest upon consolidation	130,486							130,486	36,299
Change in liquidation value of noncontrolling interest	(737)							(737)	(737)
Balance at Dec. 31, 2011	928,476		786,843	2,072	4,200,659	(1,053)	(3,414,835)	141,633	37,036
Balance (shares) at Dec. 31, 2011				209,304,000
Increase (Decrease) in Stockholders' Equity
Unrealized holding losses on marketable securities	305		305			305
Unrealized losses on foreign currency forward contracts	0
Foreign currency translation adjustment	198		198			198
Net income (loss) attributable to Vertex common shareholders	(107,032)						(107,032)
Net income (loss)	(51,135)		(107,032)					55,897
Issuances of common stock:
Benefit plans (shares)	242,000			7,983,000
Issuance of common stock under benefit plans	201,992		201,837	77	201,760			155
Stock-based compensation expense	115,539		115,058		115,058			481
Tax benefit from equity compensation	1,971		1,971		1,971
Change in liquidation value of noncontrolling interest	(1,494)							(1,494)	(1,494)
Balance at Dec. 31, 2012	1,195,852	[1]	999,180	2,149	4,519,448	(550)	(3,521,867)	196,672	38,530
Balance (shares) at Dec. 31, 2012				217,287,000
Increase (Decrease) in Stockholders' Equity
Unrealized holding losses on marketable securities	(154)		(154)			(154)
Unrealized losses on foreign currency forward contracts	(23)		(23)			(23)
Foreign currency translation adjustment	421		421			421
Net income (loss) attributable to Vertex common shareholders	(445,028)
Net income (loss)	(687,550)		(445,028)					(242,522)
Issuances of common stock:
Benefit plans (shares)	99,000			8,226,000
Issuance of common stock under benefit plans	271,738		271,801	88	271,713			(63)
Convertible senior subordinated notes (due 2015) conversion (shares)				8,276,000
Convertible senior subordinated notes (due 2015) conversion	402,265		402,265	83	402,182
Stock-based compensation expense	128,351		127,883		127,883			468
Employee Service Share-Based Compensation, Restructuring Expenses	1,312		1,312		1,312
Tax benefit from equity compensation	(1,252)		(1,252)		(1,252)
Alios noncontrolling interest upon deconsolidation	45,445							45,445	38,530
Balance at Dec. 31, 2013	$ 1,356,405	[1]	$ 1,356,405	$ 2,320	$ 5,321,286	$ (306)	$ (3,966,895)	$ 0	$ 0
Balance (shares) at Dec. 31, 2013				233,789,000

[1] Amounts as of December 31, 2012 include the assets and liabilities of Vertex’s variable interest entity (“VIE”), Alios BioPharma, Inc. (“Alios”). The Company deconsolidated Alios as of December 31, 2013. Vertex’s interests and obligations with respect to the VIE’s assets and liabilities are limited to those accorded to Vertex in its agreement with Alios. See Note B, "Collaborative Arrangements," to these consolidated financial statements for amounts.

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Marketable Securities (Details 2) (USD $)	Dec. 31, 2013		Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]
Cash equivalents (Alios)	$ 0	[1]	$ 69,983,000	[1]
Alios BioPharma, Inc
Schedule of Available-for-sale Securities [Line Items]
Cash equivalents (Alios)			70,000,000	[1]
Foreign currency forward contract
Schedule of Available-for-sale Securities [Line Items]
Derivative, Notional Amount	$ 17,500,000

[1] Amounts as of December 31, 2012 include the assets and liabilities of Vertex’s variable interest entity (“VIE”), Alios BioPharma, Inc. (“Alios”). The Company deconsolidated Alios as of December 31, 2013. Vertex’s interests and obligations with respect to the VIE’s assets and liabilities are limited to those accorded to Vertex in its agreement with Alios. See Note B, "Collaborative Arrangements," to these consolidated financial statements for amounts.

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Collaborative Arrangements (Tables)

12 Months Ended

Dec. 31, 2013

Collaborative Arrangements

Collaborator revenues

MTPC Agreement for 2012 or 2011:

	2012		2011
	(in thousands)
Amortized portion of up-front payments	$	12,744	$	38,232
Milestone revenues	485		68,515
Payments for manufacturing services	5,650		14,928
Total collaborative revenues attributable to the Mitsubishi Tanabe collaboration	$	18,879	$	121,675

During the three years ended December 31, 2013, the Company recognized the following revenues attributable to the Janssen collaboration:

	2013		2012			2011
	(in thousands)
Royalty revenues	$	130,724	$	117,592		$	20,289
Collaborative revenues:
Up-front and amendment payments revenues	$	190,345	$	12,428		$	12,428
Milestone revenues	—		—			250,000
Net reimbursement (payment) for telaprevir development costs	2,793		(3,507		)	(8,418		)
Reimbursement for manufacturing services	10,299		7,257			20,383
Total collaborative revenues attributable to the Janssen collaboration	$	203,437	$	16,178		$	274,393
Total revenues attributable to the Janssen collaboration	$	334,161	$	133,770		$	294,682

Summary of activity related to net loss (income) attributable to noncontrolling interest (Alios)

A summary of net loss (income) attributable to noncontrolling interest (Alios) for the three years ended December 31, 2013 is as follows:

	2013			2012			2011
	(in thousands)
Loss before provision for (benefit from) income taxes	$	283,747		$	20,044		$	9,536
Decrease (increase) in fair value of contingent milestone and royalty payments	124,920			(114,970		)	(69,950		)
Provision for (benefit from) income taxes	(166,145		)	39,029			48,809
Net loss (income) attributable to noncontrolling interest (Alios)	$	242,522		$	(55,897	)	$	(11,605	)

Summary of Alios' items included in the Company's consolidated balance sheets

Alios Balance Sheet Information

The Company included items related to Alios on the Company's consolidated balance sheet as of December 31, 2012. Due to the deconsolidation of Alios as of December 31, 2013, these items were not included on the Company's consolidated balance sheet as of December 31, 2013. The following table summaries items related to the Alios included on the Company's consolidated balance sheet as of December 31, 2012.

	As of December 31, 2012
		(in thousands)
Restricted cash and cash equivalents (Alios)		$	69,983
Prepaid expenses and other current assets		$	672
Property and equipment, net		$	1,728
Intangible assets		$	250,600
Other assets		$	861
Accounts payable		$	1,054
Accrued expenses		$	6,099
Income taxes payable (Alios)		$	715
Deferred tax liability		$	152,781
Other liabilities, excluding current portion		$	910
Redeemable noncontrolling interest (Alios)		$	38,530
Noncontrolling interest (Alios)		$	196,672

As of December 31, 2012, the Company recorded Alios’ cash and cash equivalents as restricted cash and cash equivalents (Alios) because (i) the Company did not have any interest in or control over Alios’ cash and cash equivalents and (ii) the Alios Agreement did not provide for these assets to be used for the development of the assets that the Company licenses from Alios pursuant to the Alios Agreement. Assets recorded as a result of consolidating Alios’ financial condition into the Company’s consolidated balance sheet did not represent additional assets that could have been used to satisfy claims against the Company’s general assets.

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Intangible Assets and Goodwill (Details) (USD $)	3 Months Ended										12 Months Ended										12 Months Ended					3 Months Ended	12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2013 VX-222Asset	Mar. 31, 2013 VX-222Asset	Dec. 31, 2012 VX-222Asset	Dec. 31, 2011 Research and Development Arrangement VX-222Asset	Dec. 31, 2010 Research and Development Arrangement VX-222Asset	Dec. 31, 2011 Research and Development Arrangement VX759Asset [Member]	Sep. 30, 2011 Research and Development Arrangement VX759Asset [Member]	Dec. 31, 2010 Research and Development Arrangement VX759Asset [Member]	Dec. 31, 2012 Alios Bio Pharma Inc	Dec. 31, 2011 Alios Bio Pharma Inc	Dec. 31, 2013 Alios Bio Pharma Inc Research and Development Arrangement	Dec. 31, 2013 Alios Bio Pharma Inc Research and Development Arrangement	Dec. 31, 2012 Alios Bio Pharma Inc Research and Development Arrangement	Dec. 31, 2011 Alios Bio Pharma Inc Research and Development Arrangement
Indefinite-Lived Intangible Assets [Line Items]
Intangible assets	$ 0	[1]				$ 663,500,000	[1]				$ 0	[1]	$ 663,500,000	[1]					$ 412,900,000	$ 412,900,000		$ 0	$ 105,800,000					$ 250,600,000	$ 250,600,000
Deferred Tax Liabilities, Intangible Assets	0					229,696,000					0		229,696,000					127,600,000
Intangible asset impairment charges	250,600,000		0	0	412,900,000	0		0	0	0	663,500,000		0		105,800,000	412,900,000					105,800,000					250,600,000	250,600,000
Change in deferred income taxes																127,600,000					32,700,000						102,100,000
Net increase to the Company's net loss per share related to the impairment charge (usd per share)																$ 1.27					$ 0.35
fair value of intangible asset																	0
Increase in net loss related to impairment charge																285,300,000					73,100,000
Goodwill	$ 30,992,000	[1]				$ 30,992,000	[1]				$ 30,992,000	[1]	$ 30,992,000	[1]										$ 4,900,000	$ 4,900,000

[1] Amounts as of December 31, 2012 include the assets and liabilities of Vertex’s variable interest entity (“VIE”), Alios BioPharma, Inc. (“Alios”). The Company deconsolidated Alios as of December 31, 2013. Vertex’s interests and obligations with respect to the VIE’s assets and liabilities are limited to those accorded to Vertex in its agreement with Alios. See Note B, "Collaborative Arrangements," to these consolidated financial statements for amounts.

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September 2009 Financial Transactions

12 Months Ended

Dec. 31, 2013

September 2009 Financial Transactions

September 2009 Financial Transactions

September 2009 Financial Transactions

2012 Notes

In September 2009, the Company sold $155.0 million in aggregate of secured notes due 2012 (the “2012 Notes”) for an aggregate of $122.2 million pursuant to a note purchase agreement with Olmsted Park S.A. (the “Purchaser”). The 2012 Notes were issued at a discount and did not pay current interest prior to maturity. The 2012 Notes were scheduled to mature on October 31, 2012, subject to earlier mandatory redemption to the extent that specified milestone events set forth in the Company’s collaboration with Janssen occurred prior to October 31, 2012. In February 2011, the Company received a milestone payment of $50.0 million and subsequently redeemed $50.0 million of 2012 Notes pursuant to their terms. The remaining $105.0 million of 2012 Notes were redeemed on October 31, 2011, with the proceeds of milestone payments received from Janssen in October 2011. The 2012 Notes contained an embedded derivative related to the potential mandatory redemption or early repayment of the 2012 Notes at the face amount prior to their maturity date. The fair value of this embedded derivative was evaluated quarterly, with changes in the fair value of the embedded derivative resulting in a corresponding gain or loss. The Company recorded quarterly interest expense related to the 2012 Notes using the effective interest rate method.

Sale of Contingent Milestone Payments

In September 2009, the Company entered into two purchase agreements with the Purchaser pursuant to which the Company sold its rights to an aggregate of $95.0 million in contingent milestone payments under the Janssen agreement related to the launch of telaprevir in the European Union, for nonrefundable payments totaling $32.8 million. The Purchaser received the $95.0 million in milestone payments from Janssen in the fourth quarter of 2011. The Company determined that this sale of a future revenue stream should be accounted for as a liability. The fair value of the rights sold to the Purchaser pursuant to the purchase agreements was evaluated each reporting period until the payments were received in the fourth quarter of 2011, with changes in the fair value of the derivative instruments based on the probability of achieving the milestones, the timing of achieving the milestones or discount rates resulting in a corresponding gain or loss.

Expenses Related to September 2009 Financial Transactions

The Company had no expenses related to these transactions in 2013 or 2012. The table below sets forth the total expenses related to the September 2009 financial transactions for 2011:

	2011
	(in thousands)
Expenses and Losses (Gains):
Interest expense related to 2012 Notes	$	21,687
Change in fair value of embedded derivative related to 2012 Notes	(400		)
Change in fair value of free-standing derivatives related to the sale of milestone payments	17,201
Total September 2009 financial transaction expenses	$	38,488

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Net Income (Loss) Per Share Attributable to Vertex Common Shareholders (Tables)

12 Months Ended

Dec. 31, 2013

Earnings Per Share [Abstract]

Calculation of net income (loss) per basic and diluted share

The following table sets forth the computation of basic and diluted net income (loss) per share for the three years ended December 31, 2013:

	2013			2012			2011
	(in thousands, except per share amounts)
Basic net income (loss) attributable to Vertex per common share calculation:
Net income (loss) attributable to Vertex common shareholders	$	(445,028	)	$	(107,032	)	$	29,574
Less: Undistributed earnings allocated to participating securities	—			—			(291		)
Net income (loss) attributable to Vertex common shareholders—basic	$	(445,028	)	$	(107,032	)	$	29,283
Basic weighted-average common shares outstanding	224,906			211,946			204,891
Basic net income (loss) attributable to Vertex per common share	$	(1.98	)	$	(0.50	)	$	0.14
Diluted net income (loss) attributable to Vertex per common share calculation:
Net income (loss) attributable to Vertex common shareholders	$	(445,028	)	$	(107,032	)	$	29,574
Less: Undistributed earnings allocated to participating securities	—			—			(285		)
Net income (loss) attributable to Vertex common shareholders—diluted	$	(445,028	)	$	(107,032	)	$	29,289
Weighted-average shares used to compute basic net income (loss) per common share	224,906			211,946			204,891
Effect of potentially dilutive securities:
Stock options	—			—			3,863
Other	—			—			53
Weighted-average shares used to compute diluted net income (loss) per common share	224,906			211,946			208,807
Diluted net income (loss) attributable to Vertex per common share	$	(1.98	)	$	(0.50	)	$	0.14

Potential gross common equivalent shares

The Company did not include the securities described in the following table in the computation of the diluted net income (loss) attributable to Vertex per common share calculations because the effect would have been anti-dilutive during each such period:

	2013	2012	2011
	(in thousands)
Stock options	15,729	19,726	9,626
Convertible senior subordinated notes	—	8,192	8,192
Unvested restricted stock and restricted stock units	2,165	2,350	8

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Income Taxes

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

The components of income (loss) before provision for (benefit from) income taxes during the three years ended December 31, 2013 consisted of the following:

	2013			2012			2011
	(in thousands)
United States	$	(390,009	)	$	256,816		$	343,515
Foreign	(586,108		)	(269,197		)	(283,070		)
Income (loss) before provision for (benefit from) income taxes	$	(976,117	)	$	(12,381	)	$	60,445

The components of the provision for (benefit from) income taxes during the three years ended December 31, 2013 consisted of the following:

	2013			2012			2011
	(in thousands)
Current taxes:
United States	$	(11,420	)	$	2,057		$	22,275
Foreign	1,084			(1,865		)	(561		)
State	2,136			1,902			8,655
Total current taxes	$	(8,200	)	$	2,094		$	30,369
Deferred taxes:
United States	$	(131,281	)	$	31,308		$	19,629
Foreign	(127,587		)	—			(32,692		)
State	(21,499		)	5,352			1,960
Total deferred taxes	$	(280,367	)	$	36,660		$	(11,103	)
Provision for (benefit from) income taxes	$	(288,567	)	$	38,754		$	19,266

The difference between the Company’s “expected” tax provision (benefit), as computed by applying the U.S. federal corporate tax rate of 35% to income (loss) before provision for (benefit from) income taxes, and actual tax is reconciled as follows:

	2013			2012			2011
	(in thousands)
Income (loss) before provision for (benefit from) income taxes	$	(976,117	)	$	(12,381	)	$	60,445
Expected tax provision (benefit)	(341,641		)	(4,333		)	21,156
State taxes, net of federal benefit	(19,268		)	7,075			10,624
Foreign rate differential	72,961			62,425			43,629
Tax credits	(16,775		)	(1,980		)	(51,086		)
Unbenefited operating losses	(43,570		)	(30,364		)	(6,286		)
Non-deductible expenses	9,614			3,198			1,953
Rate change	50,076			3,275			—
Other	36			(542		)	(724		)
Provision for (benefit from) income taxes	$	(288,567	)	$	38,754		$	19,266

Deferred tax assets and liabilities are determined based on the difference between financial statement and tax bases using enacted tax rates in effect for the year in which the differences are expected to reverse. The components of the deferred taxes were as follows:

	As of December 31,
	2013			2012
	(in thousands)
Deferred tax assets:
Net operating loss	$	850,946		$	777,687
Tax credit carryforwards	180,380			147,074
Property and equipment	—			10,701
Intangible assets	26,105			63,353
Deferred revenues	25,158			44,867
Stock-based compensation	63,521			83,979
Inventories	26,278			56,564
Accrued expenses	52,470			27,945
Currency translation adjustment	217			—
Construction financing lease obligation	152,688			—
Gross deferred tax assets	1,377,763			1,212,170
Valuation allowance	(1,243,664		)	(1,211,561		)
Total deferred tax assets	134,099			609
Deferred tax liabilities:
Property and equipment	(134,099		)	—
Unrealized gain	—			(376		)
Contingent milestone and royalty payment obligation	—			(50,904		)
Acquired intangibles	—			(229,696		)
Net deferred tax liabilities	$	—		$	(280,367	)

For federal income tax purposes, as of December 31, 2013, the Company has net operating loss carryforwards of approximately $2.7 billion and tax credits of $120.1 million, which may be used to offset future federal income and tax liability, respectively. Approximately $694.8 million of the federal net operating loss carryforward will result in an increase to additional paid-in capital if and when these carryforwards are used to reduce income taxes payable.

For state income tax purposes, the Company has net operating loss carryforwards of approximately $966.8 million and tax credits of $66.9 million, which may be used to offset future state income and tax liability, respectively. Approximately $204.5 million of the state net operating loss carryforward will result in an increase to additional paid-in capital if and when these carryforwards are used to reduce state income taxes payable.

These federal and state operating loss carryforwards and tax credits expire at various dates through 2033. After consideration of all the evidence, both positive and negative, the Company continues to maintain a valuation allowance for the full amount of the 2013 deferred tax asset because it is more likely than not that the deferred tax asset will not be realized. In future periods, if management determines that it is more likely than not that the deferred tax asset will be realized, (i) the valuation allowance would be decreased, (ii) a portion or all of the deferred tax asset would be reflected on the Company’s consolidated balance sheet and (iii) the Company would record non-cash benefits in its consolidated statements of operations related to the reflection of the deferred tax asset on its consolidated balance sheets.

The valuation allowance increased by $32.1 million from December 31, 2012 to December 31, 2013 primarily due to an increase in net operating losses and credits.

Unrecognized tax benefits during the two years ended December 31, 2013 consisted of the following:

	2013			2012
	(in thousands)
Unrecognized tax benefits beginning of year	$	4,106		$	4,360
Gross change for current year positions	1,325			598
Increase for prior period positions	—			—
Decrease for prior period positions	(290		)	—
Decrease due to settlements and payments	—			—
Decrease due to statute limitations	(185		)	(852		)
Deconsolidation of Alios	(2,932		)	—
Unrecognized tax benefits end of year	$	2,024		$	4,106

The Company had gross unrecognized tax benefits of $2.0 million and $4.1 million, respectively, as of December 31, 2013 and 2012. At December 31, 2013, $2.0 million represented the amount of unrecognized tax benefits that, if recognized, would result in a reduction of the Company’s effective tax rate. The Company recognizes interest and penalties related to income taxes as a component of income tax expense. As of December 31, 2013, no interest and penalties have been accrued. In 2014, it is reasonably possible that the Company will reduce the balance of its unrecognized tax benefits by approximately $0.5 million due to the application of statute of limitations and settlements with taxing authorities, all of which would reduce the Company’s effective tax rate.

The Company files United States federal income tax returns and income tax returns in various state, local and foreign jurisdictions. The Company is no longer subject to any tax assessment from an income tax examination in the United States before 2008 or any other major taxing jurisdiction for years before 2006, except where the Company has net operating losses or tax credit carryforwards that originate before 2006. The Company is currently under examination by Revenue Quebec and the Canada Revenue Agency for the year ended December 31, 2011. No adjustments have been reported. The Company is not under examination by any other jurisdictions for any tax year.

At December 31, 2013, foreign earnings, which were not significant, have been retained indefinitely by foreign subsidiary companies for reinvestment; therefore, no provision has been made for income taxes that would be payable upon the distribution of such earnings, and it would not be practicable to determine the amount of the related unrecognized deferred income tax liability. Upon repatriation of those earnings, in the form of dividends or otherwise, the Company would be subject to U.S. federal income taxes (subject to an adjustment for foreign tax credits) and withholding taxes payable to the various foreign countries.

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Common Stock, Preferred Stock and Equity Plans (Details) (USD $)	12 Months Ended
	Dec. 31, 2013 vote	Dec. 31, 2012	Dec. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award
Common stock, shares authorized (shares)	300,000,000	300,000,000
Common stock, votes per share (votes per share)	1
Preferred stock, shares authorized (shares)	1,000,000	1,000,000
Awards Outstanding (shares)	17,894,079
Additional awards authorized for grant (in shares)	5,411,351
Grant price of outstanding restricted stock and restricted stock units (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Outstanding and exercisable options
Stock options outstanding at beginning of period (in shares)	19,726,000
Stock options granted (in shares)	4,840,000
Stock options exercised (in shares)	(6,995,000)
Stock options forfeited (in shares)	(1,822,000)
Stock options expired (in shares)	(20,000)
Stock options outstanding at end of period (in shares)	15,729,000	19,726,000
Stock options exercisable at end of period (in shares)	7,950,000
Total exercisable or expected to vest, stock options (in shares)	14,967,000
Weighted average Exercise Price
Weighted-average exercise price outstanding at beginning of period (usd per share)	$ 38.09
Weighted average exercise price, granted (usd per share)	$ 57.87
Weighted average exercise price, exercised (usd per share)	$ 35.28
Weighted average exercise price, forfeited (usd per share)	$ 46.89
Weighted average exercise price, expired (usd per share)	$ 46.64
Weighted-average exercise price outstanding at end of period (usd per share)	$ 44.40	$ 38.09
Weighted average exercise price exercisable at the end of the period (usd per share)	$ 38.84
Total exercisable or expected to vest, weighted average exercise price (usd per share)	$ 43.95
Weighted-average Remaining Contractual Life
Weighted-average Remaining Contractual Life, outstanding (in years)	6 years 8 months 1 day
Weighted-average Remaining Contractual Life, exercisable (in years)	5 years 1 month 17 days
Weighted-average Remaining Contractual Life, total exercisable or expected to vest (in years)	6 years 6 months 22 days
Aggregate Intrinsic Value
Aggregate intrinsic value, outstanding	$ 481,311,000
Aggregate intrinsic value, exercisable	283,146,000
Aggregate intrinsic value, total exercisable or expected to vest	463,885,000
Total Intrinsic Value and Cash Received
Market price	$ 74.21
Total intrinsic value of stock options exercised	291,600,000	148,700,000	90,500,000
Total cash received from employees as a result of employee stock option exercises	$ 246,800,000	$ 172,800,000	$ 109,600,000
2013 Stock and Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Common stock, shares authorized (shares)	3,300,000
Awards Outstanding (shares)	1,170,827
Additional awards authorized for grant (in shares)	2,129,173
2006 Stock and Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Awards Outstanding (shares)	15,748,949
Additional awards authorized for grant (in shares)	3,282,178	3,000,000
1996 Stock and Option Plan
Share-based Compensation Arrangement by Share-based Payment Award
Awards Outstanding (shares)	974,303
Additional awards authorized for grant (in shares)	0
Restricted stock
Share-based Compensation Arrangement by Share-based Payment Award
Restricted stock, vested (in shares)	4 years

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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Cash flows from operating activities:
Net income (loss)	$ (687,550)		$ (51,135)		$ 41,179
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization expense	48,365		38,191		35,041
Stock-based compensation expense	127,303		114,285		118,226
Other non-cash based compensation expense	5,860		10,261		8,525
Intangible asset impairment charges	663,500		0		105,800
Secured notes (due 2012) discount amortization expense	0		0		18,409
Change in fair value of free-standing derivatives related to the sale of milestone payments	0		0		16,801
Deferred income taxes	(285,053)		36,660		(7,501)
Non-cash Expense	7,594		0		0
Deconsolidation of variable interest entity (Alios)	55,110		0		0
Write-downs of inventories to net realizable value	10,358		133,189		0
Excess tax benefit from share-based payment arrangements	1,252		(1,971)		(900)
Other non-cash items, net	6,742		178		319
Changes in operating assets and liabilities, excluding the effects of the acquisition and deconsolidation of a variable interest entity (Alios):
Accounts receivable, net	53,363		39,912		(170,606)
Inventories	7,142		(29,925)		(111,388)
Prepaid expenses and other current assets	(12,061)		(23,619)		10,358
Accounts payable	(49,234)		14,892		37,468
Accrued expenses and other liabilities	43,725		29,232		116,822
Accrued restructuring expense	5,025		(2,985)		(3,282)
Deferred revenues	(53,011)		(39,324)		(71,536)
Net cash provided by (used in) operating activities	(51,570)		267,841		143,735
Cash flows from investing activities:
Purchases of marketable securities	(2,412,418)		(1,705,829)		(721,545)
Sales and maturities of marketable securities	2,348,295		1,367,927		1,016,040
Payment for acquisition of variable interest entity (Alios)	0		0		(60,000)
Expenditures for property and equipment	(51,393)		(71,140)		(34,595)
Decrease in restricted cash and cash equivalents	31,804		2,156		0
Decrease (increase) in restricted cash and cash equivalents (Alios)	27,884		(18,105)		12,695
Decrease (increase) in other assets	1,698		(826)		(183)
Net cash provided by (used in) investing activities	(54,130)		(425,817)		212,412
Cash flows from financing activities:
Excess tax benefit from share-based payment arrangements	(1,252)		1,971		900
Issuances of common stock under benefit plans	265,878		191,721		124,862
Payments to redeem secured notes	(158)		0		(155,000)
Settlement of milestone derivatives	0		0		(95,000)
Payments on capital lease obligations	(16,057)		(2,615)		0
Payments on construction financing lease obligation	(67,527)		(18,873)		0
Net cash provided by (used in) financing activities	180,884		172,204		(124,238)
Effect of changes in exchange rates on cash	4,708		(141)		214
Net increase in cash and cash equivalents	79,892		14,087		232,123
Cash and cash equivalents—beginning of period	489,407	[1]	475,320		243,197
Cash and cash equivalents—end of period	569,299	[1]	489,407	[1]	475,320
Supplemental disclosure of cash flow information:
Cash paid for interest	11,015		13,400		13,512
Cash paid for income taxes	2,840		9,318		0
Conversion of convertible senior subordinated notes (due 2015) for common stock	399,842		0		0
Capitalization of construction in-process related to construction financing lease obligation	215,013		235,594		54,655
Assets acquired under capital lease obligations	50,972		30,101		0
Unamortized deferred debt issuance costs exchanged	$ 4,230		$ 0		$ 0

[1] Amounts as of December 31, 2012 include the assets and liabilities of Vertex’s variable interest entity (“VIE”), Alios BioPharma, Inc. (“Alios”). The Company deconsolidated Alios as of December 31, 2013. Vertex’s interests and obligations with respect to the VIE’s assets and liabilities are limited to those accorded to Vertex in its agreement with Alios. See Note B, "Collaborative Arrangements," to these consolidated financial statements for amounts.

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Consolidated Statements of Comprehensive Income (Loss) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Comprehensive Income (Loss), Net of Tax, Including Portion Attributable to Noncontrolling Interest [Abstract]
Net income (loss)	$ (687,550)	$ (51,135)	$ 41,179
Changes in other comprehensive income (loss):
Unrealized holding gains (losses) on marketable securities	(154)	305	(119)
Unrealized losses on foreign currency forward contracts	(23)	0	0
Foreign currency translation adjustment	421	198	133
Total changes in other comprehensive income (loss)	244	503	14
Comprehensive income (loss)	(687,306)	(50,632)	41,193
Comprehensive loss (income) attributable to noncontrolling interest (Alios)	242,522	(55,897)	(11,605)
Comprehensive income (loss) attributable to Vertex	$ (444,784)	$ (106,529)	$ 29,588

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Intangible Assets and Goodwill

12 Months Ended

Dec. 31, 2013

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets and Goodwill

Intangible Assets and Goodwill

Intangible Assets

As of December 31, 2013, the Company had no intangible assets recorded on its consolidated balance sheet. The intangible assets that were previously reflected on the Company's consolidated balance sheets related to drug candidates for the treatment of HCV infection. The field of HCV infection treatment is highly competitive and characterized by rapid technological advances and the development of drug candidates for the treatment of HCV infection is subject to numerous risks. Two of the Company's competitors received approval in the fourth quarter of 2013 for new treatment regimens for HCV infection that include pegylated-interferon and ribavirin, and several of the Company's competitors are conducting Phase 3 clinical trials evaluating all-oral combinations of their drug candidates for the treatment of HCV infection.

ViroChem Acquisition

As of December 31, 2010, the intangible assets acquired from ViroChem that were reflected on the Company's consolidated balance sheet related to two drug candidates, VX-222 and VX-759. VX-222 and VX-759 had estimated fair values on December 31, 2010 of $412.9 million and $105.8 million, respectively. In the third quarter of 2011, the Company determined that the fair value of VX-759 had become impaired and that its fair value was zero. As a result, the Company recorded an impairment charge in 2011 of $105.8 million that was reflected as an intangible asset impairment charge on the Company's consolidated statement of operations. In connection with this impairment charge, the Company recorded a benefit from income taxes of $32.7 million. In 2011, the decrease to the Company's net income attributable to Vertex related to this impairment charge, net of tax credit, was $73.1 million, and the net decrease to the Company's net income per share attributable to Vertex common shareholders was $0.35 per diluted share.

In 2013, the Company determined that there were indicators that the value of the VX-222 intangible asset had become impaired. This determination was based on (a) preliminary safety, tolerability and efficacy data from a Phase 2 clinical trial of VX-222, telaprevir and ribavirin, which was received in March 2013 and analyzed through April 2013 and (b) a review of the existing and emerging data regarding all-oral regimens for HCV infection being developed by the Company's competitors that appeared to be generally well tolerated with high sustained viral response rates for treatment-naïve patients with genotype 1 HCV infection. After evaluating the data from this Phase 2 clinical trial, the Company determined that regimens containing VX-222 were unlikely to be competitive with the treatment regimens being developed by the Company's competitors. The Company evaluated the fair value of VX-222 from the perspective of a market participant and based on this analysis determined that the fair value of VX-222 was zero as of March 31, 2013. Accordingly, the Company recorded a $412.9 million impairment charge in 2013. In connection with this impairment charge, the Company recorded a credit of $127.6 million in its provision for income taxes. In 2013, the increase to the Company's net loss attributable to Vertex related to this impairment charge, net of the tax credit, was $285.3 million, and the net increase to the Company's net loss per share attributable to Vertex common shareholders was $1.27 per share.

Alios Collaboration

In June 2011, the Company recorded $250.6 million of intangible assets on its consolidated balance sheet based on the Company's estimate of the fair value of Alios' HCV nucleotide analogue program, including the intellectual property related to ALS-2200 and ALS-2158. In the third quarter of 2012, after the Company discontinued the development of ALS-2158, the Company evaluated the Alios HCV nucleotide analogue program for impairment. The Company determined that there was no impairment to the program in the third quarter of 2012 because of the advancement of ALS-2200 (now formulated as VX-135).

In July 2013, the FDA placed a partial clinical hold on VX-135, which is being evaluated in Phase 2 clinical development. The partial clinical hold, which prevents the Company from further evaluation of VX-135 in the United States, remains in place as of the date of this filing.

In connection with preparing its financial statements for 2013, the Company determined that there were indicators that the value of the HCV nucleotide analogue program intangible asset had become impaired. This determination was based on, among other factors, (a) safety, tolerability and efficacy data from a Phase 2a clinical trial of VX-135 in combination with daclatasvir that the Company received in late December 2013 and analyzed and announced in January 2014, (b) the continuing partial clinical hold on VX-135 by the FDA, (c) a review of the existing and emerging data regarding all-oral regimens for HCV infection being developed by the Company's competitors, and (d) the risks associated with establishing collaborations for the potential late-stage development of a combination regimen containing VX-135 and drug candidates controlled by third parties. Based on these revised estimates, the Company evaluated the fair value of VX-135 from the perspective of a market participant and determined that the fair value of VX-135 was zero as of December 31, 2013. Accordingly, a $250.6 million impairment charge and a benefit from income taxes of $102.1 million was recorded in the fourth quarter of 2013.

Goodwill

As of December 31, 2013 and 2012, goodwill of $31.0 million was recorded on the Company's consolidated balance sheets. There was no change to goodwill during the year ended December 31, 2013.

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Document and Entity Information (USD $) In Billions, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Feb. 05, 2014	Jun. 30, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	VERTEX PHARMACEUTICALS INC / MA
Entity Central Index Key	0000875320
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Document Type	10-K
Document Period End Date	Dec. 31, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY
Amendment Flag	false
Entity Public Float			$ 18.5
Entity Common Stock, Shares Outstanding (shares)		235,771,942
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes

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Accrued Expenses and Other Liabilities, Current Portion

12 Months Ended

Dec. 31, 2013

Payables and Accruals [Abstract]

Accrued Expenses and Other Liabilities, Current Portion

Accrued Expenses and Other Liabilities, Current Portion

Accrued expenses consisted of the following:

	As of December 31,
	2013		2012
	(in thousands)
Product revenue allowances	$	85,510	$	69,936
Payroll and benefits	76,785		62,140
Research, development and commercial contract costs	52,468		63,960
Royalty payable	18,334		29,007
Other	16,241		18,932
Professional fees	10,593		11,226
Taxes payable	8,362		2,182
Unrecognized tax benefits	2,784		4,106
Interest	—		3,395
Total	$	271,077	$	264,884

Other liabilities, current portion consisted of the following:

	As of December 31,
	2013		2012
	(in thousands)
Deferred rent	$	16,652	$	14,302
Customer deposits	7,692		—
Other	392		5,400
Total	$	24,736	$	19,702

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Commitments Capital Lease Financing Obligations (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Jun. 30, 2013
Capital Leases, Future Minimum Payments Due [Abstract]
2014	$ 19,957,000
2015	18,346,000
2016	11,809,000
2017	10,714,000
2018	10,612,000
Thereafter	2,121,000
Total payments	73,559,000
Less: amount representing interest	(7,912,000)
Present value of payments	65,647,000
Letter of credit, amount outstanding				31,900,000
Term of letter of credit	1 year
Decrease in restricted cash	$ (31,804,000)	$ (2,156,000)	$ 0

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Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Current assets:
Cash and cash equivalents	$ 569,299	[1]	$ 489,407	[1]
Marketable securities, available for sale	895,777	[1]	831,808	[1]
Restricted cash and cash equivalents (Alios)	0	[1]	69,983	[1]
Accounts receivable, net	85,517	[1]	143,250	[1]
Inventories	14,147	[1]	30,464	[1]
Prepaid expenses and other current assets	23,836	[1]	24,673	[1]
Total current assets	1,588,576	[1]	1,589,585	[1]
Restricted cash	130	[1]	31,934	[1]
Property and equipment, net	696,911	[1]	433,609	[1]
Intangible assets	0	[1]	663,500	[1]
Goodwill	30,992	[1]	30,992	[1]
Other assets	2,432	[1]	9,668	[1]
Total assets	2,319,041	[1]	2,759,288	[1]
Current liabilities:
Accounts payable	49,327	[1]	101,292	[1]
Accrued expenses	271,077	[1]	264,884	[1]
Deferred revenues, current portion	21,510	[1]	27,566	[1]
Accrued restructuring expense, current portion	14,286	[1]	4,758	[1]
Capital lease obligations, current portion	16,893		13,707
Income taxes payable (Alios)	0	[1]	715	[1]
Other liabilities, current portion	24,736	[1]	19,702	[1]
Total current liabilities	397,829	[1]	432,624	[1]
Deferred revenues, excluding current portion	49,459	[1]	96,242	[1]
Accrued restructuring expense, excluding current portion	14,067	[1]	18,570	[1]
Capital lease obligations, excluding current portion	48,754		15,170
Convertible senior subordinated notes (due 2015)	0	[1]	400,000	[1]
Deferred tax liability	0	[1]	280,367	[1]
Construction financing lease obligation	440,937	[1]	268,031	[1]
Other liabilities, excluding current portion	11,590	[1]	13,902	[1]
Total liabilities	962,636	[1]	1,524,906	[1]
Commitments and contingencies (Note T and Note V)		[1]		[1]
Redeemable noncontrolling interest (Alios)	0	[1]	38,530	[1]
Shareholders’ equity:
Preferred stock, $0.01 par value; 1,000,000 shares authorized; none issued and outstanding at December 31, 2013 and 2012	0	[1]	0	[1]
Common stock, $0.01 par value; 300,000,000 shares authorized at December 31, 2013 and 2012; 233,788,852 and 217,286,868 shares issued and outstanding at December 31, 2013 and 2012, respectively	2,320	[1]	2,149	[1]
Additional paid-in capital	5,321,286	[1]	4,519,448	[1]
Accumulated other comprehensive loss	(306)	[1]	(550)	[1]
Accumulated deficit	(3,966,895)	[1]	(3,521,867)	[1]
Total Vertex shareholders’ equity	1,356,405	[1]	999,180	[1]
Noncontrolling interest (Alios)	0	[1]	196,672	[1]
Total shareholders’ equity	1,356,405	[1]	1,195,852	[1]
Total liabilities and shareholders’ equity	$ 2,319,041	[1]	$ 2,759,288	[1]

[1] Amounts as of December 31, 2012 include the assets and liabilities of Vertex’s variable interest entity (“VIE”), Alios BioPharma, Inc. (“Alios”). The Company deconsolidated Alios as of December 31, 2013. Vertex’s interests and obligations with respect to the VIE’s assets and liabilities are limited to those accorded to Vertex in its agreement with Alios. See Note B, "Collaborative Arrangements," to these consolidated financial statements for amounts.

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Marketable Securities

12 Months Ended

Dec. 31, 2013

Cash and Cash Equivalents [Abstract]

Marketable Securities

Marketable Securities

A summary of the Company’s cash, cash equivalents and marketable securities is shown below:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
December 31, 2013
Cash and cash equivalents:
Cash and money market funds	$	569,299	$	—	$	—		$	569,299
Total cash and cash equivalents	$	569,299	$	—	$	—		$	569,299
Marketable securities:
Government-sponsored enterprise securities (due within 1 year)	$	600,496	$	7	$	(53	)	$	600,450
Commercial paper (due within 1 year)	83,384		109		—			83,493
Corporate debt securities (due within 1 year)	189,674		14		(34		)	189,654
Corporate debt securities (due after 1 year through 5 years)	22,181		6		(7		)	22,180
Total marketable securities	$	895,735	$	136	$	(94	)	$	895,777
Total cash, cash equivalents and marketable securities	$	1,465,034	$	136	$	(94	)	$	1,465,076
December 31, 2012
Cash and cash equivalents:
Cash and money market funds	$	489,407	$	—	$	—		$	489,407
Total cash and cash equivalents	$	489,407	$	—	$	—		$	489,407
Marketable securities:
U.S. Treasury securities (due within 1 year)	$	111,350	$	2	$	(2	)	$	111,350
Government-sponsored enterprise securities (due within 1 year)	440,181		49		(5		)	440,225
Commercial paper (due within 1 year)	225,294		155		—			225,449
Corporate debt securities (due within 1 year)	15,429		1		(1		)	15,429
Corporate debt securities (due after 1 year through 5 years)	39,358		10		(13		)	39,355
Total marketable securities	$	831,612	$	217	$	(21	)	$	831,808
Total cash, cash equivalents and marketable securities	$	1,321,019	$	217	$	(21	)	$	1,321,215

Alios’ $70.0 million of cash and money market funds as of December 31, 2012, recorded on the Company’s consolidated balance sheet in “Restricted cash and cash equivalents (Alios),” are not included in the above table.

In December 2013, the Company initiated a hedging program intended to mitigate the changes in foreign exchange rates for a portion of the Company’s product revenues denominated in Euros, which included foreign currency forward contracts that were designated as cash flow hedges. The notional amount of Euro denominated foreign currency forward contracts as of December 31, 2013 was $17.5 million. The changes in fair value of these foreign currency forward contracts included in accumulated other comprehensive loss and the gross fair value of foreign currency forward assets and liabilities included on the consolidated balance sheet as of December 31, 2013 were not material.

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Fair Value Measurements

12 Months Ended

Dec. 31, 2013

Fair Value Disclosures [Abstract]

Fair Value Measurements

Fair Value Measurements

The fair value of the Company’s financial assets and liabilities reflects the Company’s estimate of amounts that it would have received in connection with the sale of the assets or paid in connection with the transfer of the liabilities in an orderly transaction between market participants at the measurement date. In connection with measuring the fair value of its assets and liabilities, the Company seeks to maximize the use of observable inputs (market data obtained from sources independent from the Company) and to minimize the use of unobservable inputs (the Company’s assumptions about how market participants would price assets and liabilities). The following fair value hierarchy is used to classify assets and liabilities based on the observable inputs and unobservable inputs used in order to value the assets and liabilities:

Level 1:	Quoted prices in active markets for identical assets or liabilities. An active market for an asset or liability is a market in which transactions for the asset or liability occur with sufficient frequency and volume to provide pricing information on an ongoing basis.
Level 2:	Observable inputs other than Level 1 inputs. Examples of Level 2 inputs include quoted prices in active markets for similar assets or liabilities and quoted prices for identical assets or liabilities in markets that are not active.
Level 3:	Unobservable inputs based on the Company’s assessment of the assumptions that market participants would use in pricing the asset or liability.

The Company’s investment strategy is focused on capital preservation. The Company invests in instruments that meet the credit quality standards outlined in the Company’s investment policy. This policy also limits the amount of credit exposure to any one issue or type of instrument. As of December 31, 2013, the Company’s investments were in money market funds, short-term government-sponsored enterprise securities, corporate debt securities and commercial paper.

As of December 31, 2013, all of the Company’s financial assets that were subject to fair value measurements were valued using observable inputs. The Company’s financial assets valued based on Level 1 inputs consisted of a money market funds and government-sponsored enterprise securities. The Company’s financial assets valued based on Level 2 inputs consisted of corporate debt securities and commercial paper, which consisted of investments in highly-rated investment-grade corporations. During 2013, 2012 and 2011, the Company did not record an other-than-temporary impairment charge related to its financial assets.

The following table sets forth the Company’s financial assets subject to fair value measurements:

	Fair Value Measurements as of December 31, 2013
			Fair Value Hierarchy
	Total		Level 1		Level 2		Level 3
	(in thousands)
Financial assets carried at fair value:
Cash equivalents:
Money market funds	$	255,689	$	255,689	$	—	$	—
Marketable securities:
Government-sponsored enterprise securities	600,450		600,450		—		—
Commercial paper	83,493		—		83,493		—
Corporate debt securities	211,834		—		211,834		—
Total	$	1,151,466	$	856,139	$	295,327	$	—

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Sale of HIV Protease Inhibitor Royalty Stream

12 Months Ended

Dec. 31, 2013

Sale of HIV Protease Inhibitor Royalty Stream

Sale of HIV Protease Inhibitor Royalty Stream

Sale of HIV Protease Inhibitor Royalty Stream

In 2008, the Company sold to a third party its rights to receive royalty payments from GlaxoSmithKline plc, net of royalty amounts to be earned by and due to a third party, for a one-time cash payment of $160.0 million. These royalty payments relate to net sales of HIV protease inhibitors, which had been developed pursuant to a collaboration agreement between the Company and GlaxoSmithKline plc. As of December 31, 2013, the Company had $63.5 million in deferred revenues related to the one-time cash payment, which it is recognizing over the life of the collaboration agreement with GlaxoSmithKline plc based on the units-of-revenue method. In addition, the Company continues to recognize royalty revenues equal to the amount of the third-party subroyalty and an offsetting royalty expense for the third-party subroyalty payment.

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Convertible Senior Subordinated Notes Convertible Senior Subordinated Notes

12 Months Ended

Dec. 31, 2013

Debt Disclosure [Abstract]

Convertible Senior Subordinated Notes

Convertible Senior Subordinated Notes

In September 2010, the Company completed an offering of $400.0 million in aggregate principal amount of 3.35% convertible senior subordinated notes due 2015 Notes (the "2015 Notes"). This offering resulted in $391.6 million of net proceeds to the Company. The underwriting discount and other expenses of $8.4 million were recorded as debt issuance costs and were included in other assets on the Company’s consolidated balance sheets. The 2015 Notes bore interest at the rate of 3.35% per annum, and the Company was required to make semi-annual interest payments on the outstanding principal balance of the 2015 Notes on April 1 and October 1 of each year.

The 2015 Notes were convertible at any time, at the option of the holder, into common stock at a price equal to approximately $48.83 per share, or 20.4794 shares of common stock per $1,000 principal amount of the 2015 Notes, subject to adjustment. If the closing price of the Company’s common stock exceeded 130% of the conversion price for at least 20 trading days within a period of 30 consecutive trading days, the Company had the right to redeem the 2015 Notes at its option at a redemption price equal to 100% of the principal amount of the 2015 Notes to be redeemed.

In the second quarter of 2013, the Company's common stock exceeded 130% of the conversion price of the 2015 Notes for at least 20 trading days within a period of 30 consecutive trading days, and the Company notified the holders of the 2015 Notes that it would redeem the 2015 Notes on June 17, 2013. In response to the Company's call of the 2015 Notes for redemption, in accordance with the provisions of the 2015 Notes, the holders of $399.8 million in aggregate principal amount of 2015 Notes elected to convert their 2015 Notes into the Company's common stock at the conversion price of approximately $48.83 per share. As a result of these conversions, the Company issued 8,188,448 shares of common stock. The remaining $0.2 million in aggregate principal amount of 2015 Notes was redeemed on June 17, 2013.

Pursuant to the terms of the 2015 Notes, the Company made an additional payment of $16.75 per $1,000 principal amount, payable in shares of the Company’s common stock, to the holders of the 2015 Notes that converted or redeemed their 2015 Notes after the Company called the 2015 Notes for redemption. These payments resulted in the issuance of an additional 87,109 shares of the Company's common stock. In the second quarter of 2013, the Company recognized an aggregate of $6.7 million in interest expense related to the 2015 Notes. Unamortized debt issuance costs for the 2015 Notes of $4.2 million were recorded as an offset to additional paid-in capital.

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Property and Equipment

12 Months Ended

Dec. 31, 2013

Property, Plant and Equipment [Abstract]

Property and Equipment

Property and Equipment

Property and equipment, net consisted of the following:

	As of December 31,
	2013			2012
	(in thousands)
Buildings	$	506,056		$	—
Furniture and equipment	190,555			173,766
Leasehold improvements	163,019			123,770
Software	102,520			101,276
Computers	43,096			40,779
Construction-in-process	—			290,703
Total property and equipment, gross	1,005,246			730,294
Less: accumulated depreciation	(308,335		)	(296,685		)
Total property and equipment, net	$	696,911		$	433,609

Buildings as of December 31, 2013 and construction-in-process as of December 31, 2012, related to construction costs for the buildings at Fan Pier, which were placed in service in 2013. Please refer to Note I, "Fan Pier Leases," for further information.

Total property and equipment, gross, as of December 31, 2013 and 2012, included $76.4 million and $30.1 million, respectively, for property and equipment recorded under capital leases. Accumulated depreciation, as of December 31, 2013 and 2012, included $3.8 million and $1.1 million, respectively, for property and equipment recorded under capital leases. Included in property and equipment, net as of December 31, 2013 were $5.5 million and $0.5 million in capitalized internally developed software costs and related amortization, respectively. There were no such costs included in property and equipment, net as of December 31, 2012.

The Company recorded depreciation expense of $47.3 million, $35.7 million and $28.9 million, respectively, in 2013, 2012 and 2011.

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Accumulated Other Comprehensive Loss (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012	$ (550)	[1]
Other comprehensive income (loss) before reclassifications	244
Amounts reclassified from accumulated other comprehensive loss	0
Net current period other comprehensive income (loss)	244		503		14
Balance at December 31, 2013	(306)	[1]	(550)	[1]
Foreign currency translation adjustment
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012	(746)
Other comprehensive income (loss) before reclassifications	421
Amounts reclassified from accumulated other comprehensive loss	0
Net current period other comprehensive income (loss)	421
Balance at December 31, 2013	(325)
Unrealized holding gains on marketable securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012	196
Other comprehensive income (loss) before reclassifications	(154)
Amounts reclassified from accumulated other comprehensive loss	0
Net current period other comprehensive income (loss)	(154)
Balance at December 31, 2013	42
Unrealized losses on foreign currency forward contracts
Accumulated Other Comprehensive Income (Loss) [Line Items]
Balance at December 31, 2012	0
Other comprehensive income (loss) before reclassifications	(23)
Amounts reclassified from accumulated other comprehensive loss	0
Net current period other comprehensive income (loss)	(23)
Balance at December 31, 2013	$ (23)

[1] Amounts as of December 31, 2012 include the assets and liabilities of Vertex’s variable interest entity (“VIE”), Alios BioPharma, Inc. (“Alios”). The Company deconsolidated Alios as of December 31, 2013. Vertex’s interests and obligations with respect to the VIE’s assets and liabilities are limited to those accorded to Vertex in its agreement with Alios. See Note B, "Collaborative Arrangements," to these consolidated financial statements for amounts.

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Accumulated Other Comprehensive Loss

12 Months Ended

Dec. 31, 2013

Equity [Abstract]

Accumulated Other Comprehensive Loss

Accumulated Other Comprehensive Loss

The following table summarizes the changes in accumulated other comprehensive loss by component:

	Foreign currency translation adjustment			Unrealized holding gains on marketable securities			Unrealized losses on foreign currency forward contracts			Total
	(in thousands)
Balance at December 31, 2012	$	(746	)	$	196		$	—		$	(550	)
Other comprehensive income (loss) before reclassifications	421			(154		)	(23		)	244
Amounts reclassified from accumulated other comprehensive loss	—			—			—			—
Net current period other comprehensive income (loss)	421			(154		)	(23		)	244
Balance at December 31, 2013	$	(325	)	$	42		$	(23	)	$	(306	)

For the year ended December 31, 2013, there were no amounts reclassified from accumulated other comprehensive loss.

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Inventories

12 Months Ended

Dec. 31, 2013

Inventory Disclosure [Abstract]

Inventories

Inventories

Inventories consisted of the following:

	As of December 31,
	2013		2012
	(in thousands)
Raw materials	$	489	$	3,754
Work-in-process	9,981		11,317
Finished goods	3,677		15,393
Total	$	14,147	$	30,464

In 2013, the Company recorded within cost of product revenues $10.4 million of write-offs for excess and obsolete inventories. In 2012, the Company recorded within cost of product revenues $133.2 million of write-offs for excess and obsolete INCIVEK inventories related to declining sales. The write-offs for excess and obsolete inventories of $10.4 million and $133.2 million in 2013 and 2012, respectively, affected the net loss attributable to Vertex per share, net of tax, by $0.05 and $0.61 in 2013 and 2012, respectively.

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Fan Pier Leases

12 Months Ended

Dec. 31, 2013

Fan Pier Leases [Abstract]

Fan Pier Leases

Fan Pier Leases

In 2011, the Company entered into two lease agreements, pursuant to which the Company leases approximately 1.1 million square feet of office and laboratory space in two buildings (the "Buildings") at Fan Pier in Boston, Massachusetts (the “Fan Pier Leases”). The Company commenced lease payments in December 2013, and will make lease payments pursuant to the Fan Pier Leases through December 2028. The Company has an option to extend the term of the Fan Pier Leases for an additional 10 years.

Because the Company was involved in the construction project, including having responsibility to pay for a portion of the costs of finish work and structural elements of the Buildings, the Company was deemed for accounting purposes to be the owner of the Buildings during the construction period. Therefore, the Company recorded project construction costs incurred by the landlord as an asset and a related financing obligation during the construction period. The Company evaluated the Fan Pier Leases in the fourth quarter of 2013 and determined that the Fan Pier Leases did not meet the criteria for “sale-leaseback” treatment. This determination was based on, among other things, the Company's continuing involvement with the property in the form of non-recourse financing to the lessor. Accordingly, the Company began depreciating the asset and incurring interest expense related to the financing obligation during the fourth quarter of 2013. The Company bifurcates its lease payments pursuant to the Fan Pier Leases into (i) a portion that is allocated to the Buildings and (ii) a portion that is allocated to the land on which the Buildings were constructed. The portion of the lease obligations allocated to the land is treated as an operating lease that commenced in 2011.

Property and equipment, net, included $506.1 million and $290.7 million as of December 31, 2013 and 2012, respectively, related to construction costs for the Buildings. The construction financing lease obligations related to the Buildings on the Company's consolidated balance sheets were $440.9 million and $268.0 million, respectively, as of December 31, 2013 and 2012.

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Fan Pier Leases (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011 building squarefeet leases	Dec. 31, 2013		Dec. 31, 2012
Property and Equipment
Number of leases (leases)	2
Area of leased property (in square feet)	1,100,000
Number of buildings under lease agreement (buildings)	2
Property and equipment, net		$ 696,911	[1]	$ 433,609	[1]
Construction financing lease obligation		440,937	[1]	268,031	[1]
Construction costs for Buildings at Gan Pier
Property and Equipment
Property and equipment, net		$ 506,100		$ 290,700
Kendall Square Lease
Property and Equipment
Optional term of lease agreement (in years)	10 years

[1] Amounts as of December 31, 2012 include the assets and liabilities of Vertex’s variable interest entity (“VIE”), Alios BioPharma, Inc. (“Alios”). The Company deconsolidated Alios as of December 31, 2013. Vertex’s interests and obligations with respect to the VIE’s assets and liabilities are limited to those accorded to Vertex in its agreement with Alios. See Note B, "Collaborative Arrangements," to these consolidated financial statements for amounts.

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Accrued Expenses and Other Liabilities, Current Portion (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Accrued expenses
Product revenue allowances	$ 85,510		$ 69,936
Payroll and benefits	76,785		62,140
Research, development and commercial contract costs	52,468		63,960
Royalty payable	18,334		29,007
Other	16,241		18,932
Professional fees	10,593		11,226
Taxes payable	8,362		2,182
Unrecognized tax benefits	2,784		4,106
Interest	0		3,395
Total	271,077	[1]	264,884	[1]
Deferred rent	16,652		14,302
Customer deposits	7,692		0
Other	392		5,400
Total	$ 24,736	[1]	$ 19,702	[1]

[1] Amounts as of December 31, 2012 include the assets and liabilities of Vertex’s variable interest entity (“VIE”), Alios BioPharma, Inc. (“Alios”). The Company deconsolidated Alios as of December 31, 2013. Vertex’s interests and obligations with respect to the VIE’s assets and liabilities are limited to those accorded to Vertex in its agreement with Alios. See Note B, "Collaborative Arrangements," to these consolidated financial statements for amounts.

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Property and Equipment (Details) (USD $)	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Property and Equipment
Total property and equipment, gross	$ 1,005,246,000		$ 730,294,000
Less: accumulated depreciation	(308,335,000)		(296,685,000)
Total property and equipment, net	696,911,000	[1]	433,609,000	[1]
Capital leased assets, gross	76,400,000		30,100,000
Capital leases accumulated depreciation	3,800,000		1,100,000
Depreciation and amortization expense	47,300,000		35,700,000		28,900,000
Building
Property and Equipment
Total property and equipment, gross	506,056,000		0
Furniture and equipment
Property and Equipment
Total property and equipment, gross	190,555,000		173,766,000
Leasehold improvements
Property and Equipment
Total property and equipment, gross	163,019,000		123,770,000
Software
Property and Equipment
Total property and equipment, gross	102,520,000		101,276,000
Less: accumulated depreciation	(500,000)
Total property and equipment, net	5,500,000
Computers
Property and Equipment
Total property and equipment, gross	43,096,000		40,779,000
Construction-in-process
Property and Equipment
Total property and equipment, gross	0		290,703,000
Total property and equipment, net	$ 506,100,000		$ 290,700,000

[1] Amounts as of December 31, 2012 include the assets and liabilities of Vertex’s variable interest entity (“VIE”), Alios BioPharma, Inc. (“Alios”). The Company deconsolidated Alios as of December 31, 2013. Vertex’s interests and obligations with respect to the VIE’s assets and liabilities are limited to those accorded to Vertex in its agreement with Alios. See Note B, "Collaborative Arrangements," to these consolidated financial statements for amounts.

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Nature of Business and Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2013

Accounting Policies [Abstract]

Schedule of product revenues allowances and reserve categories

The following table summarizes activity in each of the product revenue allowance and reserve categories for the three years ended December 31, 2013:

	Trade Allowances			Rebates, Chargebacks and Discounts			Product Returns			Other Incentives			Total
	(in thousands)
2013
Beginning Balance	$	5,416		$	63,560		$	2,852		$	3,565		$	75,393
Provision related to current period sales	31,395			204,459			5,795			9,295			250,944
Adjustments related to prior period sales	343			4,474			15,149			(228		)	19,738
Credits/payments made	(35,619		)	(204,249		)	(7,997		)	(11,077		)	(258,942		)
Ending Balance	$	1,535		$	68,244		$	15,799		$	1,555		$	87,133
2012
Beginning Balance	$	11,162		$	52,659		$	340		$	5,202		$	69,363
Provision related to current period sales	55,913			216,942			2,067			19,103			294,025
Adjustments related to prior period sales	29			3,883			1,498			72			5,482
Credits/payments made	(61,688		)	(209,924		)	(1,053		)	(20,812		)	(293,477		)
Ending Balance	$	5,416		$	63,560		$	2,852		$	3,565		$	75,393
2011
Beginning Balance	$	—		$	—		$	—		$	—		$	—
Provision related to current period sales	38,228			75,145			553			9,692			123,618
Credits/payments made	(27,066		)	(22,486		)	(213		)	(4,490		)	(54,255		)
Ending Balance	$	11,162		$	52,659		$	340		$	5,202		$	69,363

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Quarterly Financial Data (unaudited) (Tables)

12 Months Ended

Dec. 31, 2013

Quarterly Financial Information Disclosure [Abstract]

Schedule of quarterly financial data

	Three Months Ended
	March 31, 2013			June 30, 2013			September 30, 2013			December 31, 2013
	(in thousands, except per share amounts)
Revenues:
Product revenues, net	$	267,381		$	254,789		$	186,653		$	128,822
Royalty revenues	43,573			49,120			27,012			36,887
Collaborative revenues (1)	17,414			6,841			8,035			185,448
Total revenues	328,368			310,750			221,700			351,157
Costs and expenses:
Cost of product revenues (2)	30,955			24,695			20,048			13,281
Royalty expenses	11,788			13,236			7,291			8,983
Research and development expenses	218,095			222,455			228,624			249,609
Sales, general and administrative expenses	92,879			106,521			87,754			75,188
Restructuring expenses	39			776			12,048			27,658
Intangible asset impairment charges (3)(4)	412,900			—			—			250,600
Total costs and expenses	766,656			367,683			355,765			625,319
Loss from operations	(438,288		)	(56,933		)	(134,065		)	(274,162		)
Interest expense, net	(3,465		)	(6,551		)	(95		)	(12,619		)
Other income (expense), net (4)	(1,187		)	(27		)	4,747			(53,472		)
Loss before benefit from income taxes	(442,940		)	(63,511		)	(129,413		)	(340,253		)
Benefit from income taxes (3)(4)	(130,313		)	(1,799		)	(751		)	(155,704		)
Net loss	(312,627		)	(61,712		)	(128,662		)	(184,549		)
Net loss attributable to noncontrolling interest (Alios)	4,611			4,547			4,530			228,834
Net income (loss) attributable to Vertex	$	(308,016	)	$	(57,165	)	$	(124,132	)	$	44,285
Net income (loss) per share attributable to Vertex common shareholders:
Basic	$	(1.43	)	$	(0.26	)	$	(0.54	)	$	0.19
Diluted	$	(1.43	)	$	(0.26	)	$	(0.54	)	$	0.19
Shares used in per share calculations:
Basic	215,421			222,053			230,505			231,264
Diluted	215,421			222,053			230,505			235,717

	Three Months Ended
	March 31, 2012			June 30, 2012			September 30, 2012			December 31, 2012
	(in thousands, except per share amounts)
Revenues:
Product revenues, net	$	375,375		$	373,273		$	303,501		$	281,309
Royalty revenues	38,981			33,480			25,586			43,451
Collaborative revenues	24,381			11,552			6,919			9,234
Total revenues	438,737			418,305			336,006			333,994
Costs and expenses:
Cost of product revenues (2)	25,918			104,549			30,680			75,595
Royalty expenses	13,293			9,874			7,856			12,120
Research and development expenses	196,371			196,544			200,161			213,109
Sales, general and administrative expenses	111,146			117,514			97,684			110,452
Restructuring expenses	360			594			696			194
Intangible asset impairment charge	—			—			—			—
Total costs and expenses	347,088			429,075			337,077			411,470
Income (loss) from operations	91,649			(10,770		)	(1,071		)	(77,476		)
Interest expense, net	(3,891		)	(3,814		)	(4,054		)	(3,263		)
Other income (expense), net	150			179			13			(33		)
Income (loss) before provision for (benefit from) income taxes	87,908			(14,405		)	(5,112		)	(80,772		)
Provision for (benefit from) income taxes	32			20,063			21,355			(2,696		)
Net income (loss)	87,876			(34,468		)	(26,467		)	(78,076		)
Net loss (income) attributable to noncontrolling interest (Alios)	3,714			(30,463		)	(31,076		)	1,928
Net income (loss) attributable to Vertex	$	91,590		$	(64,931	)	$	(57,543	)	$	(76,148	)
Net income (loss) per share attributable to Vertex common shareholders:
Basic	$	0.44		$	(0.31	)	$	(0.27	)	$	(0.35	)
Diluted	$	0.43		$	(0.31	)	$	(0.27	)	$	(0.35	)
Shares used in per share calculations:
Basic	208,018			211,344			213,767			214,607
Diluted	219,264			211,344			213,767			214,607

1. During the fourth quarter of 2013, the Company recorded $182.4 million of collaborative revenue related to its Janssen collaboration, which was primarily attributable to an amendment to its collaboration agreement with Janssen. See Note B, "Collaborative Arrangements," for further information.

2. During 2013 and 2012, the Company recorded within cost of product revenues lower-of-cost or market charges for excess or obsolete inventories. See Note G, "Inventories," for further information.

3. During the first quarter of 2013, the Company recorded a $412.9 million intangible asset impairment charge related to its VX-222 indefinite-lived in-process research and development asset. In connection with this impairment charge, the Company recorded a credit of $127.6 million in its provision for income taxes. See Note J, "Intangible Assets and Goodwill," for further information.

4. During the fourth quarter of 2013, the Company deconsolidated Alios, which included certain charges related to deconsolidation recorded in other income (expense), net, and was preceded by a $250.6 million intangible asset impairment charge related to the HCV nucleotide analogue program indefinite-lived in-process research and development asset. In connection with this impairment charge, a credit of $102.1 million was recorded to the provision for income taxes attributable to Alios. See Note B, "Collaborative Arrangements," and Note J, "Intangible Assets and Goodwill," for further information.

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Stock-based Compensation Expense

12 Months Ended

Dec. 31, 2013

Disclosure of Compensation Related Costs, Share-based Payments [Abstract]

Stock-based Compensation Expense

Stock-based Compensation Expense

The Company recognizes share-based payments to employees as compensation expense using the fair value method. The fair value of stock options and shares purchased pursuant to the ESPP is calculated using the Black-Scholes option pricing model. The fair value of restricted stock and restricted stock units typically is based on the intrinsic value on the date of grant. Stock-based compensation, measured at the grant date based on the fair value of the award, is typically recognized as expense ratably over the service period. The expense recognized over the service period includes an estimate of awards that will be forfeited.

The effect of stock-based compensation expense during the three years ended December 31, 2013 was as follows:

	2013		2012		2011
	(in thousands)
Stock-based compensation expense by line item:
Research and development expenses	$	81,467	$	71,533	$	75,574
Sales, general and administrative expenses	45,836		42,752		42,652
Total stock-based compensation expense included in costs and expenses	$	127,303	$	114,285	$	118,226

The stock-based compensation expense by type of award during the three years ended December 31, 2013 was as follows:

	2013			2012			2011
	(in thousands)
Stock-based compensation expense by type of award:
Stock options	$	85,067		$	79,047		$	83,098
Restricted stock and restricted stock units	36,479			29,194			30,708
ESPP share issuances	6,805			7,298			5,462
Less: stock-based compensation expense capitalized to inventories	(1,048		)	(1,254		)	(1,042		)
Total stock-based compensation expense included in costs and expenses	$	127,303		$	114,285		$	118,226

The Company capitalizes stock-based compensation expense to inventories, all of which is attributable to employees who supported the Company’s manufacturing operations for the Company's products.

The following table sets forth the Company’s unrecognized stock-based compensation expense, net of estimated forfeitures, as of December 31, 2013, by type of award and the weighted-average period over which that expense is expected to be recognized:

	As of December 31, 2013
	Unrecognized Expense Net of Estimated Forfeitures		Weighted-average Recognition Period
	(in thousands)		(in years)
Type of award:
Stock options	$	141,283	2.56
Restricted stock and restricted stock units	$	73,490	2.47
ESPP share issuances	$	5,956	0.67

Stock Options

The Company issues stock options with service conditions, which are generally the vesting periods of the awards. In 2009, the Company also issued, to certain members of senior management, stock options with performance conditions that vested upon the satisfaction of the performance conditions by the end of the first quarter of 2012. The Company uses the Black-Scholes option pricing model to estimate the fair value of stock options at the grant date. The Black-Scholes option pricing model uses the option exercise price as well as estimates and assumptions related to the expected price volatility of the Company’s stock, the rate of return on risk-free investments, the expected period during which the options will be outstanding, and the expected dividend yield for the Company’s stock to estimate the fair value of a stock option on the grant date. The options granted during 2013, 2012 and 2011 had a weighted-average grant-date fair value per share of $25.79, $19.72 and $20.88, respectively.

The fair value of each option granted during 2013, 2012 and 2011 was estimated on the date of grant using the Black-Scholes option pricing model with the following weighted-average assumptions:

	2013		2012		2011
Expected stock price volatility	46.20	%	47.93	%	49.53	%
Risk-free interest rate	1.25	%	0.95	%	2.09	%
Expected term of options (in years)	5.81		5.78		5.74
Expected annual dividends	—		—		—

The weighted-average valuation assumptions were determined as follows:

• Expected stock price volatility: Options to purchase the Company’s stock with remaining terms of greater than one year are regularly traded in the market. Expected stock price volatility is calculated using the trailing one month average of daily implied volatilities prior to grant date.

• Risk-free interest rate: The Company bases the risk-free interest rate on the interest rate payable on U.S. Treasury securities in effect at the time of grant for a period that is commensurate with the assumed expected option term.

• Expected term of options: The expected term of options represents the period of time options are expected to be outstanding. The Company uses historical data to estimate employee exercise and post-vest termination behavior. The Company believes that all groups of employees exhibit similar exercise and post-vest termination behavior and therefore does not stratify employees into multiple groups in determining the expected term of options.

• Expected annual dividends: The estimate for annual dividends is $0.00 because the Company has not historically paid, and does not intend for the foreseeable future to pay, a dividend.

Restricted Stock and Restricted Stock Units

The Company issues restricted stock and restricted stock units with service conditions, which are generally the vesting periods of the awards. The Company also issues, to certain members of senior management, restricted stock and restricted stock units that vest upon the earlier of the satisfaction of (i) a performance condition or (ii) a service condition.

Employee Stock Purchase Plan

The weighted-average fair value of each purchase right granted during 2013, 2012 and 2011 was $21.08, $12.90 and $9.80, respectively. The following table reflects the weighted-average assumptions used in the Black-Scholes option pricing model for 2013, 2012 and 2011:

	2013		2012		2011
Expected stock price volatility	54.69	%	46.90	%	51.32	%
Risk-free interest rate	0.08	%	0.16	%	0.08	%
Expected term (in years)	0.74		0.74		0.72
Expected annual dividends	—		—		—

The expected stock price volatility for ESPP offerings is based on implied volatility. The Company bases the risk-free interest rate on the interest rate payable on U.S. Treasury securities in effect at the time of grant for a period that is commensurate with the assumed expected term. The expected term represents purchases and purchase periods that take place within the offering period. The expected annual dividends estimate is $0.00 because the Company has not historically paid, and does not for the foreseeable future intend to pay, a dividend.

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Employee Benefits

12 Months Ended

Dec. 31, 2013

Compensation and Retirement Disclosure [Abstract]

Employee Benefits

Employee Benefits

The Company has a 401(k) retirement plan (the “Vertex 401(k) Plan”) in which substantially all of its permanent U.S. employees are eligible to participate. Participants may contribute up to 60% of their annual compensation to the Vertex 401(k) Plan, subject to statutory limitations. The Company may declare discretionary matching contributions to the Vertex 401(k) Plan. Employees have the ability to transfer funds from the stock fund invested in Vertex common stock, subject to certain restrictions. As of December 31, 2013, 755,000 shares of common stock remained available for grant under the Vertex 401(k) Plan. Through mid-2013, the Company paid matching contributions in Vertex common stock in the form of fully-vested interests in a Vertex common stock fund. Beginning in mid-2013, the Company began paying matching contributions in the form of cash.

The Company declared matching contributions paid in fully-vested interests in the Vertex common stock fund to the Vertex 401(k) Plan as follows:

	2013		2012		2011
	(in thousands)
Discretionary matching contributions during the year ended December 31,	$	5,930	$	10,261	$	8,619
Shares issued during the year ended December 31,	99		242		183
Shares issuable as of the year ended December 31,	0		53		62

In 2013, the Company declared matching contributions paid in fully-vested interests in the Vertex common stock fund of $5.9 million, paid matching contributions in the form of cash of $5.0 million and accrued $2.4 million related to matching contributions for the fourth quarter of 2013, which will be paid in the first quarter of 2014.

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Commitments (Tables)

12 Months Ended

Dec. 31, 2013

Commitments

Future minimum commitments under Fan Pier Leases and facilitiy operating leases with terms of more than one year, net of estimated sublease income

As of December 31, 2013, future minimum commitments under the Fan Pier Leases, facility operating leases with terms of more than one year and contractual sublease income under the Company’s subleases for the Kendall Square Facility were as follows:

Year	Fan Pier Leases		Kendall Square Lease		Kendall Sublease Income			Other Operating Leases		Total Lease Commitments (Net of Sublease Income)
	(in thousands)
2014	$	67,206	$	19,879	$	(8,546	)	$	40,762	$	119,301
2015	67,206		19,879		(3,996		)	33,398		116,487
2016	67,206		19,879		—			14,434		101,519
2017	67,206		19,879		—			12,995		100,080
2018	67,206		6,626		—			12,841		86,673
Thereafter	752,798		—		—			75,344		828,142
Total minimum lease payments	$	1,088,828	$	86,142	$	(12,542	)	$	189,774	$	1,352,202

Schedule of future minimum lease payments for capital leases

The following table sets forth the Company’s future minimum payments due under capital leases as of December 31, 2013:

Year	(in thousands)
2014	$	19,957
2015	18,346
2016	11,809
2017	10,714
2018	10,612
Thereafter	2,121
Total payments	73,559
Less: amount representing interest	(7,912		)
Present value of payments	$	65,647

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Property and Equipment (Tables)

12 Months Ended

Dec. 31, 2013

Property, Plant and Equipment [Abstract]

Schedule of Property and equipment

Property and equipment, net consisted of the following:

	As of December 31,
	2013			2012
	(in thousands)
Buildings	$	506,056		$	—
Furniture and equipment	190,555			173,766
Leasehold improvements	163,019			123,770
Software	102,520			101,276
Computers	43,096			40,779
Construction-in-process	—			290,703
Total property and equipment, gross	1,005,246			730,294
Less: accumulated depreciation	(308,335		)	(296,685		)
Total property and equipment, net	$	696,911		$	433,609

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Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
Statement of Financial Position [Abstract]
Preferred stock, par value (usd per share)	$ 0.01	$ 0.01
Preferred stock, shares authorized (shares)	1,000,000	1,000,000
Preferred stock, shares issued (shares)	0	0
Preferred stock, shares outstanding (shares)	0	0
Common stock, par value (usd per share)	$ 0.01	$ 0.01
Common stock, shares authorized (shares)	300,000,000	300,000,000
Common stock, shares issued (shares)	233,788,852	217,286,868
Common stock, shares outstanding (shares)	233,788,852	217,286,868

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Net Income (Loss) Per Share Attributable to Vertex Common Shareholders

12 Months Ended

Dec. 31, 2013

Earnings Per Share [Abstract]

Net Income (Loss) Per Share Attributable to Vertex Common Stockholders

Net Income (Loss) Per Share Attributable to Vertex Common Shareholders

The following table sets forth the computation of basic and diluted net income (loss) per share for the three years ended December 31, 2013:

	2013			2012			2011
	(in thousands, except per share amounts)
Basic net income (loss) attributable to Vertex per common share calculation:
Net income (loss) attributable to Vertex common shareholders	$	(445,028	)	$	(107,032	)	$	29,574
Less: Undistributed earnings allocated to participating securities	—			—			(291		)
Net income (loss) attributable to Vertex common shareholders—basic	$	(445,028	)	$	(107,032	)	$	29,283
Basic weighted-average common shares outstanding	224,906			211,946			204,891
Basic net income (loss) attributable to Vertex per common share	$	(1.98	)	$	(0.50	)	$	0.14
Diluted net income (loss) attributable to Vertex per common share calculation:
Net income (loss) attributable to Vertex common shareholders	$	(445,028	)	$	(107,032	)	$	29,574
Less: Undistributed earnings allocated to participating securities	—			—			(285		)
Net income (loss) attributable to Vertex common shareholders—diluted	$	(445,028	)	$	(107,032	)	$	29,289
Weighted-average shares used to compute basic net income (loss) per common share	224,906			211,946			204,891
Effect of potentially dilutive securities:
Stock options	—			—			3,863
Other	—			—			53
Weighted-average shares used to compute diluted net income (loss) per common share	224,906			211,946			208,807
Diluted net income (loss) attributable to Vertex per common share	$	(1.98	)	$	(0.50	)	$	0.14

The Company did not include the securities described in the following table in the computation of the diluted net income (loss) attributable to Vertex per common share calculations because the effect would have been anti-dilutive during each such period:

	2013	2012	2011
	(in thousands)
Stock options	15,729	19,726	9,626
Convertible senior subordinated notes	—	8,192	8,192
Unvested restricted stock and restricted stock units	2,165	2,350	8

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Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Summary of cash, cash equivalents and marketable securities
Amortized Cost	$ 1,465,034	$ 1,321,019
Gross Unrealized Gains	136	217
Gross Unrealized Losses	(94)	(21)
Fair Value	1,465,076	1,321,215
Total cash and cash equivalents
Summary of cash, cash equivalents and marketable securities
Amortized Cost	569,299	489,407
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	569,299	489,407
Cash and money market funds
Summary of cash, cash equivalents and marketable securities
Amortized Cost	569,299	489,407
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Fair Value	569,299	489,407
Total marketable securities
Summary of cash, cash equivalents and marketable securities
Amortized Cost	895,735	831,612
Gross Unrealized Gains	136	217
Gross Unrealized Losses	(94)	(21)
Fair Value	895,777	831,808
U.S. Treasury securities
Summary of cash, cash equivalents and marketable securities
Amortized Cost		111,350
Gross Unrealized Gains		2
Gross Unrealized Losses		(2)
Fair Value		111,350
Government-sponsored enterprise securities
Summary of cash, cash equivalents and marketable securities
Amortized Cost	600,496	440,181
Gross Unrealized Gains	7	49
Gross Unrealized Losses	(53)	(5)
Fair Value	600,450	440,225
Commercial paper (due within 1 year)
Summary of cash, cash equivalents and marketable securities
Amortized Cost	83,384	225,294
Gross Unrealized Gains	109	155
Gross Unrealized Losses	0	0
Fair Value	83,493	225,449
Corporate debt securities (due within 1 year)
Summary of cash, cash equivalents and marketable securities
Amortized Cost	189,674	15,429
Gross Unrealized Gains	14	1
Gross Unrealized Losses	(34)	(1)
Fair Value	189,654	15,429
Corporate debt securities (due after 1 year through 5 years)
Summary of cash, cash equivalents and marketable securities
Amortized Cost	22,181	39,358
Gross Unrealized Gains	6	10
Gross Unrealized Losses	(7)	(13)
Fair Value	$ 22,180	$ 39,355

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Quarterly Financial Data (unaudited) (Details) (USD $) Share data in Thousands, except Per Share data, unless otherwise specified	3 Months Ended										12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012		Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2003
Revenues:
Product revenues, net	$ 128,822,000		$ 186,653,000	$ 254,789,000	$ 267,381,000	$ 281,309,000		$ 303,501,000	$ 373,273,000	$ 375,375,000	$ 837,645,000		$ 1,333,458,000		$ 950,889,000
Royalty revenues	36,887,000		27,012,000	49,120,000	43,573,000	43,451,000		25,586,000	33,480,000	38,981,000	156,592,000		141,498,000		50,015,000
Collaborative revenues (1)	185,448,000		8,035,000	6,841,000	17,414,000	9,234,000		6,919,000	11,552,000	24,381,000	217,738,000		52,086,000		409,722,000
Total revenues	351,157,000		221,700,000	310,750,000	328,368,000	333,994,000		336,006,000	418,305,000	438,737,000	1,211,975,000		1,527,042,000		1,410,626,000
Costs and expenses:
Cost of product revenues (2)	13,281,000		20,048,000	24,695,000	30,955,000	75,595,000		30,680,000	104,549,000	25,918,000	88,979,000		236,742,000		63,625,000
Royalty expenses	8,983,000		7,291,000	13,236,000	11,788,000	12,120,000		7,856,000	9,874,000	13,293,000	41,298,000		43,143,000		16,880,000
Research and development expenses	249,609,000		228,624,000	222,455,000	218,095,000	213,109,000		200,161,000	196,544,000	196,371,000	918,783,000		806,185,000		707,706,000
Sales, general and administrative expenses	75,188,000		87,754,000	106,521,000	92,879,000	110,452,000		97,684,000	117,514,000	111,146,000	362,342,000		436,796,000		400,721,000
Restructuring expenses	27,658,000		12,048,000	776,000	39,000	194,000		696,000	594,000	360,000	40,521,000		1,844,000		2,074,000	91,824,000
Intangible asset impairment charges	250,600,000		0	0	412,900,000	0		0	0	0	663,500,000		0		105,800,000
Total costs and expenses	625,319,000		355,765,000	367,683,000	766,656,000	411,470,000		337,077,000	429,075,000	347,088,000	2,115,423,000		1,524,710,000		1,296,806,000
Income (loss) from operations	(274,162,000)		(134,065,000)	(56,933,000)	(438,288,000)	(77,476,000)		(1,071,000)	(10,770,000)	91,649,000	(903,448,000)		2,332,000		113,820,000
Interest expense, net	(12,619,000)		(95,000)	(6,551,000)	(3,465,000)	(3,263,000)		(4,054,000)	(3,814,000)	(3,891,000)	(22,730,000)		(15,022,000)		(37,681,000)
Interest expense						(33,000)		13,000	179,000	150,000
Other income (expense), net	53,472,000		(4,747,000)	27,000	1,187,000
Income (loss) before provision for (benefit from) income taxes	(340,253,000)		(129,413,000)	(63,511,000)	(442,940,000)	(80,772,000)		(5,112,000)	(14,405,000)	87,908,000	(976,117,000)		(12,381,000)		60,445,000
Benefit from income taxes (3)(4)	(155,704,000)		(751,000)	(1,799,000)	(130,313,000)	(2,696,000)		21,355,000	20,063,000	32,000	(288,567,000)		38,754,000		19,266,000
Net income (loss)	(184,549,000)		(128,662,000)	(61,712,000)	(312,627,000)	(78,076,000)		(26,467,000)	(34,468,000)	87,876,000	(687,550,000)		(51,135,000)		41,179,000
Net loss (income) attributable to noncontrolling interest (Alios)	228,834,000		4,530,000	4,547,000	4,611,000	1,928,000		(31,076,000)	(30,463,000)	3,714,000	242,522,000		(55,897,000)		(11,605,000)
Net income (loss) attributable to Vertex	44,285,000		(124,132,000)	(57,165,000)	(308,016,000)	(76,148,000)		(57,543,000)	(64,931,000)	91,590,000	(445,028,000)		(107,032,000)		29,574,000
Net income (loss) per share attributable to Vertex common shareholders:
Basic (usd per share)	$ 0.19		$ (0.54)	$ (0.26)	$ (1.43)	$ (0.35)		$ (0.27)	$ (0.31)	$ 0.44	$ (1.98)		$ (0.50)		$ 0.14
Diluted (usd per share)	$ 0.19		$ (0.54)	$ (0.26)	$ (1.43)	$ (0.35)		$ (0.27)	$ (0.31)	$ 0.43	$ (1.98)		$ (0.50)		$ 0.14
Shares used in per share calculations:
Basic (shares)	231,264		230,505	222,053	215,421	214,607		213,767	211,344	208,018	224,906		211,946		204,891
Diluted (shares)	235,717		230,505	222,053	215,421	214,607		213,767	211,344	219,264	224,906		211,946		208,807
Write-downs of inventories to net realizable value											10,358,000		133,189,000		0
Write-down of inventories effect on net income (loss) per share (usd per share)											$ (0.05)		$ (0.61)
Intangible assets	0	[1]				663,500,000	[1]				0	[1]	663,500,000	[1]
Janssen
Revenues:
Royalty revenues											130,724,000		117,592,000		20,289,000
Collaborative revenues (1)	182,400,000										203,437,000		16,178,000		274,393,000
Total revenues											334,161,000		133,770,000		294,682,000
Alios Bio Pharma Inc
Costs and expenses:
Benefit from income taxes (3)(4)											(166,145,000)		39,029,000		48,809,000
Net loss (income) attributable to noncontrolling interest (Alios)											(242,522,000)		55,897,000		11,605,000
Research and Development Arrangement | Alios Bio Pharma Inc
Costs and expenses:
Intangible asset impairment charges	250,600,000										250,600,000
Shares used in per share calculations:
Intangible assets						$ 250,600,000							$ 250,600,000		$ 250,600,000

[1] Amounts as of December 31, 2012 include the assets and liabilities of Vertex’s variable interest entity (“VIE”), Alios BioPharma, Inc. (“Alios”). The Company deconsolidated Alios as of December 31, 2013. Vertex’s interests and obligations with respect to the VIE’s assets and liabilities are limited to those accorded to Vertex in its agreement with Alios. See Note B, "Collaborative Arrangements," to these consolidated financial statements for amounts.

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Common Stock, Preferred Stock and Equity Plans (Details 2) (USD $) In Millions, except Share data, unless otherwise specified	1 Months Ended	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Stock options outstanding and exercisable
Exercise price range, options outstanding (in shares)		15,729,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)		6 years 8 months 1 day
Exercise price range, options outstanding, weighted-average exercise price (in dollars per share)		$ 44.40
Exercise price range, options exercisable (in shares)		7,950,000
Exercise price range, options exercisable, weighted-average exercise price (in dollars per share)		$ 38.84
Restricted stock
Restricted stock, as of the beginning of the period (in shares)		2,270,000
Restricted stock, granted (in shares)		1,356,000
Restricted stock, vested (in shares)		(800,000)
Restricted stock, cancelled (in shares)		(780,000)
Restricted stock, as of the end of the period (in shares)	2,270,000	2,046,000	2,270,000
Restricted stock, weighted-average grant-date fair value
Weighted-average grant-date fair value, as of the beginning of the period (in dollars per share)		$ 42.92
Weighted-average grant-date fair value, granted (in dollars per share)		$ 62.16
Weighted-average grant-date fair value, vested (in dollars per share)		$ 42.27
Weighted-average grant-date fair value, cancelled (in dollars per share)		$ 51.47
Weighted-average grant-date fair value, as of the end of the period (in dollars per share)	$ 42.92	$ 52.66	$ 42.92
Vested in period, total fair value	$ 50.9		$ 41.1	$ 34.6
Range of Exercise Prices, $9.07-$20.00
Stock options outstanding and exercisable
Exercise price, low end of range (usd per share)		$ 9.09
Exercise price, high end of range (usd per share)		$ 20.00
Exercise price range, options outstanding (in shares)		432,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)		2 years 4 months 13 days
Exercise price range, options outstanding, weighted-average exercise price (in dollars per share)		$ 15.37
Exercise price range, options exercisable (in shares)		432,000
Exercise price range, options exercisable, weighted-average exercise price (in dollars per share)		$ 15.37
Range of Exercise Prices, $20.01-$30.00
Stock options outstanding and exercisable
Exercise price, low end of range (usd per share)		$ 20.01
Exercise price, high end of range (usd per share)		$ 30
Exercise price range, options outstanding (in shares)		1,055,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)		5 years 8 months 27 days
Exercise price range, options outstanding, weighted-average exercise price (in dollars per share)		$ 29.38
Exercise price range, options exercisable (in shares)		812,000
Exercise price range, options exercisable, weighted-average exercise price (in dollars per share)		$ 29.23
Range of Exercise Prices, $30.01-$40.00
Stock options outstanding and exercisable
Exercise price, low end of range (usd per share)		$ 30.01
Exercise price, high end of range (usd per share)		$ 40.00
Exercise price range, options outstanding (in shares)		6,842,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)		5 years 26 days
Exercise price range, options outstanding, weighted-average exercise price (in dollars per share)		$ 36.55
Exercise price range, options exercisable (in shares)		4,773,000
Exercise price range, options exercisable, weighted-average exercise price (in dollars per share)		$ 36.06
Range of Exercise Prices, $40.01-$50.00
Stock options outstanding and exercisable
Exercise price, low end of range (usd per share)		$ 40.01
Exercise price, high end of range (usd per share)		$ 50.00
Exercise price range, options outstanding (in shares)		4,136,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)		8 years 8 months 27 days
Exercise price range, options outstanding, weighted-average exercise price (in dollars per share)		$ 46.32
Exercise price range, options exercisable (in shares)		787,000
Exercise price range, options exercisable, weighted-average exercise price (in dollars per share)		$ 46.62
Range of Exercise Prices, $50.01-$60.00
Stock options outstanding and exercisable
Exercise price, low end of range (usd per share)		$ 50.01
Exercise price, high end of range (usd per share)		$ 60.00
Exercise price range, options outstanding (in shares)		1,713,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)		7 years 1 month 28 days
Exercise price range, options outstanding, weighted-average exercise price (in dollars per share)		$ 53.78
Exercise price range, options exercisable (in shares)		874,000
Exercise price range, options exercisable, weighted-average exercise price (in dollars per share)		$ 54.35
Price Range From Dollars $60.01-$70.00
Stock options outstanding and exercisable
Exercise price, low end of range (usd per share)		$ 60.01
Exercise price, high end of range (usd per share)		$ 70.00
Exercise price range, options outstanding (in shares)		80,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)		9 years 29 days
Exercise price range, options outstanding, weighted-average exercise price (in dollars per share)		$ 65.54
Exercise price range, options exercisable (in shares)		14,000
Exercise price range, options exercisable, weighted-average exercise price (in dollars per share)		$ 63.20
Price Range From Dollars $70.01 to $80.00
Stock options outstanding and exercisable
Exercise price, low end of range (usd per share)		$ 70.01
Exercise price, high end of range (usd per share)		$ 80.00
Exercise price range, options outstanding (in shares)		87,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)		9 years 3 months 22 days
Exercise price range, options outstanding, weighted-average exercise price (in dollars per share)		$ 77.55
Exercise price range, options exercisable (in shares)		9,000
Exercise price range, options exercisable, weighted-average exercise price (in dollars per share)		$ 77.73
Price Range From Dollars $80.01 to $88.18
Stock options outstanding and exercisable
Exercise price, low end of range (usd per share)		$ 80.01
Exercise price, high end of range (usd per share)		$ 88.18
Exercise price range, options outstanding (in shares)		1,384,000
Exercise price range, options outstanding, weighted-average remaining contractual life (in years)		9 years 6 months
Exercise price range, options outstanding, weighted-average exercise price (in dollars per share)		$ 83.11
Exercise price range, options exercisable (in shares)		249,000
Exercise price range, options exercisable, weighted-average exercise price (in dollars per share)		$ 82.13
Employee Stock Purchase Plan
Employee Stock Purchase Plan
Offering period		12 months
Number of purchase periods (purchase periods)		2
Duration of purchase period		6 months
Eligible employee purchase price percentage of fair value		85.00%
Number of shares authorized (shares)		1,753,381
Number of shares (shares)		527,000
Average price paid per share (usd per share)		$ 36.21

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Commitments

12 Months Ended

Dec. 31, 2013

Commitments

Commitments

Commitments

The Company moved into its new corporate headquarters in January 2014. Please refer to Note I, "Fan Pier Leases," for additional information regarding this commitment. The leases for the Company’s former headquarters expire in December 2015.

The term of the Kendall Square Lease began in January 2003. The Company occupies and uses for its operations approximately 120,000 square feet of the Kendall Square Facility and plans to cease using for its operations this portion of the Kendall Square Facility in 2014. The Company has sublease arrangements in place for the remaining rentable square footage of the Kendall Square Facility, with terms that expire in April 2015 and August 2015. The Kendall Square Lease will expire in 2018. Please refer to Note R, "Restructuring Expenses," for further information.

As of December 31, 2013, future minimum commitments under the Fan Pier Leases, facility operating leases with terms of more than one year and contractual sublease income under the Company’s subleases for the Kendall Square Facility were as follows:

Year	Fan Pier Leases		Kendall Square Lease		Kendall Sublease Income			Other Operating Leases		Total Lease Commitments (Net of Sublease Income)
	(in thousands)
2014	$	67,206	$	19,879	$	(8,546	)	$	40,762	$	119,301
2015	67,206		19,879		(3,996		)	33,398		116,487
2016	67,206		19,879		—			14,434		101,519
2017	67,206		19,879		—			12,995		100,080
2018	67,206		6,626		—			12,841		86,673
Thereafter	752,798		—		—			75,344		828,142
Total minimum lease payments	$	1,088,828	$	86,142	$	(12,542	)	$	189,774	$	1,352,202

During 2013, 2012 and 2011, rental expense was $57.7 million, $57.1 million and $49.4 million, respectively.

The Company has outstanding capital leases for equipment, leasehold improvements and software licenses with terms through 2019. The leases were accounted for as capital leases.  The capital leases bear interest at rates ranging from 2% to 7% per year. The following table sets forth the Company’s future minimum payments due under capital leases as of December 31, 2013:

Year	(in thousands)
2014	$	19,957
2015	18,346
2016	11,809
2017	10,714
2018	10,612
Thereafter	2,121
Total payments	73,559
Less: amount representing interest	(7,912		)
Present value of payments	$	65,647

In addition, the Company has committed to make potential future milestone and royalty payments pursuant to certain collaboration agreements. Payments generally become due and payable upon the achievement of certain developmental, regulatory and/or commercial milestones. Please refer to Note B, "Collaborative Arrangements," for further information.

In the second quarter of 2013, the Company began supporting $31.9 million in irrevocable stand-by letters of credit issued in support of property leases and other similar agreements with an unsecured credit facility with a one-year term. The Company previously had cash-collateralized these stand-by letters of credit. As a result of this credit facility, the restricted cash reflected on the Company's consolidated balance sheets decreased by $31.8 million net of other activity during 2013, and the Company's cash and cash equivalents increased by a corresponding amount during 2013.

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Income Taxes (Details 2) (USD $)	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Tax Carryforwards
Unrecognized Tax Benefits, Reduction Resulting from Lapse of Applicable Statute of Limitations and Settlements with Taxing Authorities, Estimated in Next Fiscal Year	$ 500,000								$ 500,000
Federal statutory income tax rate (percent)									35.00%	35.00%	35.00%
Reconciliation of Income Tax Expense:
Income (loss) before provision for (benefit from) income taxes	(340,253,000)	(129,413,000)	(63,511,000)	(442,940,000)	(80,772,000)	(5,112,000)	(14,405,000)	87,908,000	(976,117,000)	(12,381,000)	60,445,000
Expected tax provision (benefit)									(341,641,000)	(4,333,000)	21,156,000
State taxes, net of federal benefit									(19,268,000)	7,075,000	10,624,000
Foreign rate differential									72,961,000	62,425,000	43,629,000
Tax credits									(16,775,000)	(1,980,000)	(51,086,000)
Unbenefited operating losses									(43,570,000)	(30,364,000)	(6,286,000)
Non-deductible expenses									9,614,000	3,198,000	1,953,000
Rate change									50,076,000	3,275,000	0
Other									36,000	(542,000)	(724,000)
Provision for (benefit from) income taxes	(155,704,000)	(751,000)	(1,799,000)	(130,313,000)	(2,696,000)	21,355,000	20,063,000	32,000	(288,567,000)	38,754,000	19,266,000
Federal net operating loss carryforward	694,800,000								694,800,000
Reconciliation of unrecognized tax benefits
Unrecognized tax benefits beginning of year				4,106,000				4,360,000	4,106,000	4,360,000
Gross change for current year positions									1,325,000	598,000
Increase for prior period positions									0	0
Decrease for prior period positions									(290,000)	0
Decrease due to settlements and payments									0	0
Decrease due to statute limitations									(185,000)	(852,000)
Deconsolidation of Alios									(2,932,000)	0
Unrecognized tax benefits end of year	2,024,000				4,106,000				2,024,000	4,106,000	4,360,000
Deferred tax assets:
Net operating loss	850,946,000				777,687,000				850,946,000	777,687,000
Tax credit carryforwards	180,380,000				147,074,000				180,380,000	147,074,000
Property and equipment	0				10,701,000				0	10,701,000
Intangible assets	26,105,000				63,353,000				26,105,000	63,353,000
Deferred revenues	25,158,000				44,867,000				25,158,000	44,867,000
Stock-based compensation	63,521,000				83,979,000				63,521,000	83,979,000
Inventories	26,278,000				56,564,000				26,278,000	56,564,000
Accrued expenses	52,470,000				27,945,000				52,470,000	27,945,000
Currency translation adjustment	217,000				0				217,000	0
Construction financing lease obligation	152,688,000				0				152,688,000	0
Gross deferred tax assets	1,377,763,000				1,212,170,000				1,377,763,000	1,212,170,000
Valuation allowance	(1,243,664,000)				(1,211,561,000)				(1,243,664,000)	(1,211,561,000)
Total deferred tax assets	134,099,000				609,000				134,099,000	609,000
Property and equipment	(134,099,000)				0				(134,099,000)	0
Deferred tax liabilities:
Unrealized gain	0				(376,000)				0	(376,000)
Contingent milestone and royalty payment obligation	0				(50,904,000)				0	(50,904,000)
Acquired intangibles	0				(229,696,000)				0	(229,696,000)
Net deferred tax liabilities	0				(280,367,000)				0	(280,367,000)
Decreased in valuation allowance									(32,100,000)
Federal
Reconciliation of Income Tax Expense:
Operating Loss	2,700,000,000								2,700,000,000
Tax Credit	120,100,000								120,100,000
State
Reconciliation of Income Tax Expense:
Operating Loss	966,800,000								966,800,000
Tax Credit	66,900,000								66,900,000
Federal net operating loss carryforward	$ 204,500,000								$ 204,500,000

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Marketable Securities (Tables)

12 Months Ended

Dec. 31, 2013

Cash and Cash Equivalents [Abstract]

Summary of cash, cash equivalents and marketable securities

A summary of the Company’s cash, cash equivalents and marketable securities is shown below:

	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
	(in thousands)
December 31, 2013
Cash and cash equivalents:
Cash and money market funds	$	569,299	$	—	$	—		$	569,299
Total cash and cash equivalents	$	569,299	$	—	$	—		$	569,299
Marketable securities:
Government-sponsored enterprise securities (due within 1 year)	$	600,496	$	7	$	(53	)	$	600,450
Commercial paper (due within 1 year)	83,384		109		—			83,493
Corporate debt securities (due within 1 year)	189,674		14		(34		)	189,654
Corporate debt securities (due after 1 year through 5 years)	22,181		6		(7		)	22,180
Total marketable securities	$	895,735	$	136	$	(94	)	$	895,777
Total cash, cash equivalents and marketable securities	$	1,465,034	$	136	$	(94	)	$	1,465,076
December 31, 2012
Cash and cash equivalents:
Cash and money market funds	$	489,407	$	—	$	—		$	489,407
Total cash and cash equivalents	$	489,407	$	—	$	—		$	489,407
Marketable securities:
U.S. Treasury securities (due within 1 year)	$	111,350	$	2	$	(2	)	$	111,350
Government-sponsored enterprise securities (due within 1 year)	440,181		49		(5		)	440,225
Commercial paper (due within 1 year)	225,294		155		—			225,449
Corporate debt securities (due within 1 year)	15,429		1		(1		)	15,429
Corporate debt securities (due after 1 year through 5 years)	39,358		10		(13		)	39,355
Total marketable securities	$	831,612	$	217	$	(21	)	$	831,808
Total cash, cash equivalents and marketable securities	$	1,321,019	$	217	$	(21	)	$	1,321,215

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Common Stock, Preferred Stock and Equity Plans

12 Months Ended

Dec. 31, 2013

Common Stock, Preferred Stock and Equity Plans

Common Stock, Preferred Stock and Equity Plans

Common Stock, Preferred Stock and Equity Plans

The Company is authorized to issue 300,000,000 shares of common stock. Holders of common stock are entitled to one vote per share. Holders of common stock are entitled to receive dividends, if and when declared by the Company’s Board of Directors, and to share ratably in the Company’s assets legally available for distribution to the Company’s shareholders in the event of liquidation. Holders of common stock have no preemptive, subscription, redemption or conversion rights. The holders of common stock do not have cumulative voting rights.

The Company is authorized to issue 1,000,000 shares of preferred stock in one or more series and to fix the powers, designations, preferences and relative participating, option or other rights thereof, including dividend rights, conversion rights, voting rights, redemption terms, liquidation preferences and the number of shares constituting any series, without any further vote or action by the Company's shareholders. As of December 31, 2013 and 2012, the Company had no shares of preferred stock issued or outstanding.

Stock and Option Plans

The purpose of each of the Company’s stock and option plans is to attract, retain and motivate its employees, consultants and directors. Awards granted under these plans can be incentive stock options (“ISOs”), nonstatutory stock options (“NSOs”), restricted stock (“RSs”), restricted stock units (“RSUs”) or other equity-based awards, as specified in the individual plans.

Shares issued under all of the Company’s plans are funded through the issuance of new shares. The following table contains information about the Company’s equity plans:

			As of December 31, 2013
Title of Plan	Group Eligible	Type of Award Granted	Awards Outstanding	Additional Awards Authorized for Grant
2013 Stock and Option Plan	Employees, Non-employee Directors and Consultants	NSO, ISO, RS and RSU	1,170,827	2,129,173
2006 Stock and Option Plan	Employees, Non-employee Directors and Consultants	NSO, ISO, RS and RSU	15,748,949	3,282,178
1996 Stock and Option Plan	Employees, Non-employee Directors, Advisors and Consultants	NSO, ISO and RS	974,303	—
Total			17,894,079	5,411,351

All options granted under the Company’s 2013 Stock and Option Plan ("2013 Plan"), 2006 Stock and Option Plan (“2006 Plan”) and 1996 Stock and Option Plan were granted with an exercise price equal to the fair value of the underlying common stock on the date of grant. As of December 31, 2013, the stock and option plans under which the Company makes new equity awards are the Company’s 2006 Plan and 2013 Plan. Under the 2006 Plan and the 2013 Plan, no stock options can be awarded with an exercise price less than the fair market value on the date of grant. The Company’s shareholders authorized 3,300,000 shares for issuance pursuant to the 2013 Plan in 2013 and approved an increase in the number of shares authorized for issuance pursuant to the 2006 Plan of 3,000,000 shares in 2012.

During the three years ended December 31, 2013, grants to current employees and directors had a grant date that was the same as the date the award was approved by the Company’s Board of Directors. During the three years ended December 31, 2013, for grants to new employees and directors, the date of grant for awards was the employee’s first day of employment or the date the director was elected to the Company’s Board of Directors. All options awarded under the Company’s stock and option plans expire not more than ten years from the grant date.

During the three years ended December 31, 2013, all shares of outstanding restricted stock and restricted stock units have been granted at a price equal to $0.01, the par value of the Company’s common stock. Vesting of options, restricted stock and restricted stock units generally is ratable over specified periods, usually four years, and is determined by the Company’s Board of Directors.

The following table summarizes information related to the outstanding and exercisable options during the year ended December 31, 2013:

	Stock Options		Weighted-average Exercise Price		Weighted-average Remaining Contractual Life	Aggregate Intrinsic Value
	(in thousands)		(per share)		(in years)	(in thousands)
Outstanding at December 31, 2012	19,726		$	38.09
Granted	4,840		$	57.87
Exercised	(6,995	)	$	35.28
Forfeited	(1,822	)	$	46.89
Expired	(20	)	$	46.64
Outstanding at December 31, 2013	15,729		$	44.40	6.67	$	481,311
Exercisable at December 31, 2013	7,950		$	38.84	5.13	$	283,146
Exercisable and Expected to Vest at December 31, 2013	14,967		$	43.95	6.56	$	463,885

The aggregate intrinsic value in the table above represents the total pre-tax amount, net of exercise price, that would have been received by option holders if all option holders had exercised all options with an exercise price lower than the market price on December 31, 2013, which was $74.21 based on the average of the high and low price of the Company’s common stock on that date.

The total intrinsic value (the amount by which the fair market value exceeded the exercise price) of stock options exercised during 2013, 2012 and 2011 was $291.6 million, $148.7 million and $90.5 million, respectively. The total cash received by the Company as a result of employee stock option exercises during 2013, 2012 and 2011 was $246.8 million, $172.8 million and $109.6 million, respectively.

The following table summarizes information about stock options outstanding and exercisable at December 31, 2013:

	Options Outstanding				Options Exercisable
Range of Exercise Prices	Number Outstanding	Weighted-average Remaining Contractual Life	Weighted-average Exercise Price		Number Exercisable	Weighted-average Exercise Price
	(in thousands)	(in years)	(per share)		(in thousands)	(per share)
$ 9.09–$20.00	432	2.37	$	15.37	432	$	15.37
$20.01–$30.00	1,055	5.74	$	29.38	812	$	29.23
$30.01–$40.00	6,842	5.07	$	36.55	4,773	$	36.06
$40.01–$50.00	4,136	8.74	$	46.32	787	$	46.62
$50.01–$60.00	1,713	7.16	$	53.78	874	$	54.35
$60.01–$70.00	80	9.08	$	65.54	14	$	63.20
$70.01-$80.00	87	9.31	$	77.55	9	$	77.73
$80.01–$88.18	1,384	9.50	$	83.11	249	$	82.13
Total	15,729	6.67	$	44.40	7,950	$	38.84

The following table summarizes the restricted stock activity of the Company during the year ended December 31, 2013:

	Restricted Stock		Weighted-average Grant-date Fair Value
	(in thousands)		(per share)
Unvested at December 31, 2012	2,270		$	42.92
Granted	1,356		$	62.16
Vested	(800	)	$	42.27
Cancelled	(780	)	$	51.47
Unvested at December 31, 2013	2,046		$	52.66

The total fair value of restricted stock that vested during 2013, 2012 and 2011 (measured on the date of vesting) was $50.9 million, $41.1 million and $34.6 million, respectively.

Employee Stock Purchase Plan

The Company has an employee stock purchase plan (the “ESPP”). The ESPP permits eligible employees to enroll in a twelve-month offering period comprising two six-month purchase periods. Participants may purchase shares of the Company’s common stock, through payroll deductions, at a price equal to 85% of the fair market value of the common stock on the first day of the applicable twelve-month offering period, or the last day of the applicable six-month purchase period, whichever is lower. Purchase dates under the ESPP occur on or about May 14 and November 14 of each year. In 2012, the Company's shareholders approved an increase in the number of shares of common stock authorized for issuance pursuant to the ESPP. As of December 31, 2013, there were 1,753,381 shares of common stock authorized for issuance pursuant to the ESPP.

In 2013, the following shares were issued to employees under the ESPP:

	Year Ended December 31, 2013
	(in thousands, except per share amount)
Number of shares	527
Average price paid per share	$	36.21