10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

☒ Quarterly report pursuant to Section 13 or 15 (d) of the Securities Exchange Act of 1934

For the quarterly period ended March 31, 2021

or

☐ 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: 0-27756

 

ALEXION PHARMACEUTICALS, INC.

(Exact Name of Registrant as Specified in Its Charter)

Delaware	13-3648318
(State or Other Jurisdiction of Incorporation or Organization)	(I.R.S. Employer Identification No.)

121 Seaport Boulevard, Boston Massachusetts 02210

(Address of Principal Executive Offices) (Zip Code)

475-230-2596

(Registrant’s telephone number, including area code)

N/A

(Former name, former address, and former fiscal year, if changed since last report)

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

Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common Stock $0.0001 par value	ALXN	NASDAQ Stock Market LLC

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  ☐

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§ 232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes  x   No  ☐

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

Large accelerated filer  x   Accelerated filer  ☐ Non-accelerated filer  ☐

Smaller reporting company  ☐ Emerging growth company  ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

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

Common Stock	$0.0001 par value	221,019,230
Class		Outstanding as of April 28, 2021

Alexion Pharmaceuticals, Inc.

Table of Contents

			Page
PART I.		FINANCIAL INFORMATION
	Item 1.	Condensed Consolidated Financial Statements (Unaudited)
		Condensed Consolidated Balance Sheets as of March 31, 2021 and December 31, 2020	2
		Condensed Consolidated Statements of Operations for the three months ended March 31, 2021 and 2020	3
		Condensed Consolidated Statements of Comprehensive Income for the three months ended March 31, 2021 and 2020	4
		Condensed Consolidated Statements of Changes in Stockholders' Equity for the three months ended March 31, 2021 and 2020	5
		Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2021 and 2020	6
		Notes to Condensed Consolidated Financial Statements	8
	Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations	38
	Item 3.	Quantitative and Qualitative Disclosures about Market Risk	66
	Item 4.	Controls and Procedures	68
PART II.		OTHER INFORMATION	69
	Item 1.	Legal Proceedings	69
	Item 1A.	Risk Factors	70
	Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	107
	Item 5.	Other Information	107
	Item 6.	Exhibits	108
SIGNATURES

Alexion Pharmaceuticals, Inc.

Condensed Consolidated Balance Sheets

(unaudited)

(amounts in millions, except per share amounts)

	March 31,		December 31,
	2021		2020
Assets
Current Assets:
Cash and cash equivalents	$	3,429.6	$	2,964.5
Marketable securities	39.7		34.9
Trade accounts receivable, net	1,473.0		1,409.3
Inventories	803.9		775.7
Prepaid expenses and other current assets	706.4		648.6
Total current assets	6,452.6		5,833.0
Property, plant and equipment, net	1,244.8		1,238.8
Intangible assets, net	3,048.3		3,002.4
Goodwill	5,100.1		5,100.1
Right of use operating assets	216.8		223.1
Deferred tax assets	2,140.6		2,199.4
Other assets	447.0		506.2
Total assets	$	18,650.2	$	18,103.0
Liabilities and Stockholders' Equity
Current Liabilities:
Accounts payable	$	125.3	$	118.6
Accrued expenses	910.7		1,084.7
Current portion of long-term debt	143.2		142.4
Current portion of contingent consideration	120.0		114.9
Other current liabilities	127.0		164.1
Total current liabilities	1,426.2		1,624.7
Long-term debt, less current portion	2,388.8		2,419.6
Contingent consideration	303.5		299.4
Deferred tax liabilities	1,639.1		1,632.2
Noncurrent operating lease liabilities	170.8		177.1
Other liabilities	290.8		298.8
Total liabilities	6,219.2		6,451.8
Commitments and contingencies (Note 17)
Stockholders' Equity:
Common stock, $0.0001 par value; 290.0 shares authorized; 242.3 and 240.9 shares issued at March 31, 2021 and December 31, 2020, respectively	—		—
Additional paid-in capital	9,243.3		9,152.9
Treasury stock, at cost, 21.4 shares at March 31, 2021 and December 31, 2020	(2,620.5)		(2,620.3)
Accumulated other comprehensive loss	(85.2)		(124.6)
Retained earnings	5,879.2		5,243.2
Total Alexion stockholders' equity	12,416.8		11,651.2
Noncontrolling interest	14.2		—
Total stockholders' equity	12,431.0		11,651.2
Total liabilities and stockholders' equity	$	18,650.2	$	18,103.0

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

2

Alexion Pharmaceuticals, Inc.

Condensed Consolidated Statements of Operations

(unaudited)

(amounts in millions, except per share amounts)

	Three months ended March 31,
	2021		2020
Net product sales	$	1,635.7	$	1,444.6
Other revenue	0.8		0.2
Total revenues	1,636.5		1,444.8
Costs and expenses:
Cost of sales (exclusive of amortization of purchased intangible assets)	125.4		111.7
Research and development	289.1		200.9
Selling, general and administrative	342.9		319.9
Amortization of purchased intangible assets	53.2		73.7
Change in fair value of contingent consideration	9.2		5.8
Acquired in-process research and development	193.3		—
Acquisition-related costs	13.2		38.1
Restructuring expenses	(0.7)		(0.8)
Gain on sale of assets	(25.3)		—
Total costs and expenses	1,000.3		749.3
Operating income	636.2		695.5
Other income and expense:
Investment expense, net	(7.0)		(5.2)
Interest expense	(27.1)		(25.8)
Other income and (expense)	0.5		(0.9)
Income before income taxes	602.6		663.6
Income tax expense	113.4		106.0
Net income	489.2		557.6
Net loss attributable to noncontrolling interest	146.8		—
Net income attributable to Alexion	$	636.0	$	557.6
Earnings per common share attributable to Alexion:
Basic	$	2.89	$	2.52
Diluted	$	2.86	$	2.50
Shares used in computing earnings per common share attributable to Alexion:
Basic	220.1		221.6
Diluted	222.6		222.6

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

3

Alexion Pharmaceuticals, Inc.

Condensed Consolidated Statements of Comprehensive Income

(unaudited)

(amounts in millions)

	Three months ended March 31,
	2021		2020
Net income	$	489.2	$	557.6
Other comprehensive income (loss), net of tax:
Foreign currency translation	(13.1)		(8.0)
Unrealized losses on debt securities	—		(0.2)
Unrealized gains (losses) on hedging activities, net of tax expense (benefit) of $15.8 and $(8.2), respectively	52.5		(26.5)
Other comprehensive income (loss), net of tax	39.4		(34.7)
Comprehensive income	$	528.6	$	522.9
Comprehensive loss attributable to noncontrolling interest	146.8		—
Comprehensive income attributable to Alexion	$	675.4	$	522.9

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

4

Alexion Pharmaceuticals, Inc.

Condensed Consolidated Statements of Changes in Stockholders’ Equity

(unaudited)

(amounts in millions)

Three months ended March 31, 2021	Common Stock			Additional Paid-In Capital		Treasury Stock at Cost			Accumulated Other Comprehensive Income (Loss)		Retained Earnings		Total Alexion Stockholders' Equity		Noncontrolling Interest		Total Stockholders’ Equity
	Shares Issued	Amount				Shares	Amount
Balances, December 31, 2020	240.9	$	—	$	9,152.9	21.4	$	(2,620.3)	$	(124.6)	$	5,243.2	$	11,651.2	$	—	$	11,651.2
VIE noncontrolling interest upon consolidation	—	—		—		—	—		—		—		—		161.0		161.0
Issuance of common stock under stock option and stock purchase plans	0.1	—		14.2		—	—		—		—		14.2		—		14.2
Issuance of restricted common stock	1.3	—		—		—	—		—		—		—		—		—
Share-based compensation expense	—	—		76.2		—	(0.2)		—		—		76.0		—		76.0
Net income (loss)	—	—		—		—	—		—		636.0		636.0		(146.8)		489.2
Other comprehensive income	—	—		—		—	—		39.4		—		39.4		—		39.4
Balances, March 31, 2021	242.3	$	—	$	9,243.3	21.4	$	(2,620.5)	$	(85.2)	$	5,879.2	$	12,416.8	$	14.2	$	12,431.0

Three months ended March 31, 2020	Common Stock			Additional Paid-In Capital		Treasury Stock at Cost			Accumulated Other Comprehensive Income (Loss)		Retained Earnings		Total Alexion Stockholders' Equity		Noncontrolling Interest		Total Stockholders’ Equity
	Shares Issued	Amount				Shares	Amount
Balances, December 31, 2019	237.8	$	—	$	8,804.7	16.5	$	(2,105.9)	$	(66.8)	$	4,639.8	$	11,271.8	$	—	$	11,271.8
Repurchase of common stock	—	—		—		1.3	(107.1)		—		—		(107.1)		—		(107.1)
Issuance of common stock under stock option and stock purchase plans	0.1	—		2.8		—	—		—		—		2.8		—		2.8
Issuance of restricted common stock	1.0	—		—		—	—		—		—		—		—		—
Share-based compensation expense	—	—		57.4		—	—		—		—		57.4		—		57.4
Net income	—	—		—		—	—		—		557.6		557.6		—		557.6
Other comprehensive loss	—	—		—		—	—		(34.7)		—		(34.7)		—		(34.7)
Balances, March 31, 2020	238.9	$	—	$	8,864.9	17.8	$	(2,213.0)	$	(101.5)	$	5,197.4	$	11,747.8	$	—	$	11,747.8

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

5

Alexion Pharmaceuticals, Inc.

Condensed Consolidated Statements of Cash Flows

(unaudited)

(amounts in millions)

	Three months ended March 31,
	2021		2020
Cash flows from operating activities:
Net income	$	489.2	$	557.6
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	75.6		89.3
Change in fair value of contingent consideration	9.2		5.8
Share-based compensation expense	76.6		57.6
Consolidation of Caelum, including non-cash expense for acquired IPR&D and cash acquired	210.2		—
Deferred taxes	52.9		49.0
Unrealized foreign currency loss	10.9		7.1
Unrealized gain on forward contracts	(19.3)		(15.0)
Unrealized loss on strategic equity investments	9.6		9.2
Gain on sale of assets	(25.3)		—
Other	2.8		13.7
Changes in operating assets and liabilities, excluding the effect of acquisitions:
Accounts receivable	(87.9)		(120.9)
Inventories (inclusive of inventories reported in other assets)	(59.5)		37.3
Prepaid expenses, right of use operating assets and other assets	11.0		(72.9)
Accounts payable, accrued expenses, lease liabilities and other liabilities	(118.4)		(68.2)
Net cash provided by operating activities	637.6		549.6
Cash flows from investing activities:
Purchases of available-for-sale debt securities	—		(19.4)
Proceeds from maturity or sale of available-for-sale debt securities	—		141.4
Purchases of mutual funds related to nonqualified deferred compensation plan	(7.0)		(6.9)
Proceeds from sale of mutual funds related to nonqualified deferred compensation plan	3.3		3.3
Purchases of intangible assets	(110.0)		—
Purchases of property, plant and equipment	(20.2)		(12.2)
Payment for acquisition of businesses, net of cash and restricted cash acquired	—		(837.7)
Purchases of strategic equity investments and options	—		(34.5)
Net cash used in investing activities	(133.9)		(766.0)
Cash flows from financing activities:
Payments on term loan	(32.6)		(32.6)
Repurchases of common stock	—		(107.1)
Net proceeds from issuance of common stock under share-based compensation arrangements	15.2		2.8
Other	(1.3)		(1.3)
Net cash used in financing activities	(18.7)		(138.2)
Effect of exchange rate changes on cash and cash equivalents and restricted cash	(13.1)		(13.2)
Net change in cash and cash equivalents and restricted cash	471.9		(367.8)
Cash and cash equivalents and restricted cash at beginning of period	3,034.6		2,723.6
Cash and cash equivalents and restricted cash at end of period	$	3,506.5	$	2,355.8

6

	Three months ended March 31,
	2021		2020
Supplemental non-cash flow disclosures from investing and financing activities:
Contingent consideration issued in acquisitions	$	—	$	155.0
Exchange of intellectual property rights for strategic equity investments	$	5.0	$	—
Operating ROU lease assets obtained in exchange for operating lease liabilities	$	1.5	$	3.7
Accounts payable and accrued expenses for purchases of property, plant and equipment and intangible assets	$	5.4	$	13.0

The following provides a reconciliation of cash and cash equivalents and restricted cash reported within the condensed consolidated balance sheets to the total of such amounts shown in the condensed consolidated statements of cash flows:

	Three months ended March 31,
	2021		2020
Cash and cash equivalents	$	3,429.6	$	2,315.0
Restricted cash included in other current assets	76.9		40.7
Restricted cash included in other noncurrent assets	—		0.1
Total cash and cash equivalents and restricted cash reported in the condensed consolidated statement of cash flows	$	3,506.5	$	2,355.8

Restricted cash included in other current assets and other noncurrent assets was $70.0 and $0.1, respectively, as of December 31, 2020. Amounts included in restricted cash primarily represent funds placed in escrow as a result of the judicial order issued by the Federal Court of Canada related to SOLIRIS pricing (refer to Note 17, Commitments and Contingencies).

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

7

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

1.Business

Business

Alexion Pharmaceuticals, Inc. (Alexion, the Company, we, our or us) is a global biopharmaceutical company focused on serving patients and families affected by rare diseases and devastating conditions through the discovery, development and commercialization of life-changing medicines.

As a leader in rare diseases for more than 25 years, Alexion has developed and commercializes two approved complement inhibitors to treat patients with paroxysmal nocturnal hemoglobinuria (PNH) and atypical hemolytic uremic syndrome (aHUS), as well as the first and only approved complement inhibitor to treat anti-acetylcholine receptor (AChR) antibody-positive generalized myasthenia gravis (gMG) and neuromyelitis optica spectrum disorder (NMOSD) in patients who are anti-aquaporin-4 (AQP4) antibody positive. Alexion also has two highly innovative enzyme replacement therapies and the first and only approved therapies for patients with life-threatening and ultra-rare metabolic disorders, hypophosphatasia (HPP) and lysosomal acid lipase deficiency (LAL-D) as well as the first and only approved Factor Xa inhibitor reversal agent for patients treated with rivaroxaban or apixaban when reversal of anticoagulation is needed due to life-threatening or uncontrolled bleeding.

In addition to our marketed therapies, we have a diverse pipeline resulting from internal innovation and business development. Alexion focuses its research efforts on novel molecules and targets in the complement cascade and its development efforts on the core therapeutic areas of hematology, nephrology, neurology, metabolic disorders, cardiology, ophthalmology and acute care. We were incorporated in 1992 under the laws of the State of Delaware.

Merger Agreement with AstraZeneca

On December 12, 2020, we entered into an Agreement and Plan of Merger (the Merger Agreement) with AstraZeneca PLC, a public limited company incorporated under the laws of England and Wales (AstraZeneca), Delta Omega Sub Holdings Inc., a Delaware corporation and a wholly owned subsidiary of AstraZeneca (Bidco), Delta Omega Sub Holdings Inc. 1, a Delaware corporation and a direct, wholly owned subsidiary of Bidco (Merger Sub I) and Delta Omega Sub Holdings LLC 2, a Delaware limited liability company and a direct, wholly owned subsidiary of Bidco (Merger Sub II). The Merger Agreement provides, among other things, that subject to the satisfaction or waiver of the conditions set forth therein (1) Merger Sub I will merge with and into Alexion (the “First Merger”), with Alexion surviving the First Merger as a wholly owned subsidiary of Bidco, and (2) immediately following the effective time of the First Merger (the Effective Time), Alexion will merge with and into Merger Sub II (the Second Merger and, together with the First Merger, the Mergers), with Merger Sub II surviving the Second Merger as a wholly owned subsidiary of Bidco and an indirect wholly owned subsidiary of AstraZeneca.

Under the Merger Agreement, at the Effective Time (as defined in the Merger Agreement), each share of common stock, par value $0.0001 per share, of Alexion issued and outstanding immediately prior to the Effective Time (other than certain excluded shares as described in the Merger Agreement) will be converted into the right to receive (1) 2.1243 American depositary shares of AstraZeneca (or, at the election of the holder thereof, a number of ordinary shares of AstraZeneca equal to the number of underlying ordinary shares represented by such American depositary shares) and (2) $60.00 in cash, without interest (collectively, the Merger Consideration).

The boards of directors of both companies have unanimously approved the acquisition.

The respective obligations of Alexion and AstraZeneca to consummate the transactions contemplated by the Merger Agreement are subject to the satisfaction or waiver of a number of customary conditions, including: (1) the adoption of the Merger Agreement by Alexion’s stockholders; (2) approval of the transactions contemplated by the Merger Agreement by AstraZeneca’s shareholders; (3) the absence of any law or order prohibiting consummation of the Mergers; (4) AstraZeneca’s registration statement on Form F-4 having been declared effective by the Securities and Exchange Commission; (5) AstraZeneca’s shareholder circular (or, if required, prospectus) having been approved by the U.K. Financial Conduct Authority; (6) the American depository shares of AstraZeneca issuable in the Mergers (and the ordinary shares of AstraZeneca represented thereby) having been approved for listing on the Nasdaq; (7) the expiration or early termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and the approval of the Mergers under the antitrust and foreign investment laws of other specified jurisdictions; (8) accuracy of the other party’s representations and warranties, subject to certain materiality standards set forth in the Merger Agreement and (9) compliance by the other party in all material respects with such other party’s obligations under the Merger Agreement.

8

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

Without limiting the generality of the foregoing, we are subject to a variety of specified restrictions under the Merger Agreement. Unless we obtain AstraZeneca’s prior written consent (which consent may not be unreasonably withheld, conditioned or delayed) and except (i) as required or expressly contemplated by the Merger Agreement, (ii) as required by applicable law or (iii) as set forth in the confidential disclosure schedule delivered by Alexion to AstraZeneca, we may not, among other things and subject to certain exceptions and aggregate limitations, incur additional indebtedness, issue additional shares of our common stock outside of our equity incentive plans, repurchase our common stock, pay dividends, acquire assets, securities or property, dispose of businesses or assets, enter into material contracts or make certain additional capital expenditures.

Under the Merger Agreement, Alexion will be required to make a payment to AstraZeneca equal to $1,180.0 if the Merger Agreement is terminated in certain circumstances, including because the Alexion board of directors has changed its recommendation in favor of the Mergers or we terminated the Merger Agreement in order to enter into an agreement providing for a Company Superior Proposal (as defined in the Merger Agreement), and Alexion will be required to make a payment to AstraZeneca equal to $270.0 if the Merger Agreement is terminated because Alexion’s stockholders fail to adopt the Merger Agreement. AstraZeneca will be required to make a payment to Alexion equal to $1,415.0 if the Merger Agreement is terminated in certain circumstances, including because the AstraZeneca board of directors has changed its recommendation in favor of the Mergers or because AstraZeneca’s shareholders fail to approve the transactions contemplated by the Merger Agreement.

The acquisition is expected to close during the third quarter 2021.

2.Basis of Presentation and Principles of Consolidation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. These accounting principles were applied on a basis consistent with those of the consolidated financial statements contained in the Company's Annual Report on Form 10-K for the year ended December 31, 2020. In our opinion, the accompanying unaudited condensed consolidated financial statements include all adjustments, consisting of only normal recurring adjustments, necessary for a fair statement of our financial statements for interim periods presented in accordance with accounting principles generally accepted in the United States. The condensed consolidated balance sheet as of December 31, 2020 was derived from audited annual financial statements but does not include all disclosures required by accounting principles generally accepted in the United States. These interim financial statements should be read in conjunction with the audited financial statements for the year ended December 31, 2020 included in our Annual Report on Form 10-K for the year ended December 31, 2020. The results of operations for the three months ended March 31, 2021 are not necessarily indicative of the results to be expected for the full year or any other future periods.

Our significant accounting policies are described in Note 1 of the notes to the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2020 and updated, as necessary in this report.

The financial statements of our subsidiaries with functional currencies other than the U.S. dollar are translated into U.S. dollars using period-end exchange rates for assets and liabilities, historical exchange rates for stockholders' equity and weighted average exchange rates for operating results. Translation gains and losses are included in accumulated other comprehensive income (loss), net of tax, in stockholders' equity. Foreign currency transaction gains and losses are included in the results of operations in other income and expense.

The accompanying unaudited condensed consolidated financial statements include the accounts of Alexion Pharmaceuticals, Inc. and its subsidiaries, including Caelum Biosciences (Caelum), a variable interest entity (VIE) for which we are the primary beneficiary, refer to Note 10, Caelum Biosciences. All intercompany balances and transactions have been eliminated in consolidation.

We assess whether we are the primary beneficiary of a VIE at the inception of the arrangement and at each reporting date. This assessment is based on our power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and our obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE. For the consolidation of Caelum, we record net income (loss) attributable to noncontrolling interest in our consolidated statements of operations based on the ownership interest retained by the respective noncontrolling parties.

9

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

New Accounting Pronouncements

ASU 2020-04, “Reference Rate Reform, Facilitation of the Effects of Reference Rate Reform on Financial Reporting": In response to concerns about structural risks of interbank offered rates, and, particularly, the risk of cessation of the London Interbank Offered Rate (LIBOR), regulators around the world have undertaken reference rate reform initiatives to identify alternative reference rates that are more observable or transaction-based and less susceptible to manipulation. In March 2020, the Financial Accounting Standards Board (FASB) issued a new standard that provides optional guidance for a limited time to ease the potential burden in accounting for the effects of reference rate reform, including optional expedients and exceptions for the accounting implications of contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met.

The amendments in this new standard only apply to contracts and hedging relationships that reference LIBOR or another reference rate expected to be discontinued due to reference rate reform. The expedients and exceptions provided by the standard do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022. We are currently reviewing our contracts impacted by reference rate reform and are assessing the impact of this standard on our financial condition and results of operations.

Recently Adopted Accounting Pronouncements

Accounting Standards Update (ASU) 2019-12, “Income Taxes: Simplifying the Accounting for Income Taxes”: In December 2019, the FASB issued a new standard intended to simplify the accounting for income taxes by eliminating certain exceptions related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. The new standard also simplifies aspects of the accounting for franchise taxes and enacted changes in tax laws or rates and clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. The standard is effective for annual periods beginning after December 15, 2020 and interim periods within, with early adoption permitted. Adoption of the standard requires certain changes to be made prospectively, with some changes to be made retrospectively. We adopted the new standard on January 1, 2021. The adoption of this standard did not have an impact on our financial condition and results of operations.

ASU 2020-01, “Investments - Equity Securities, Investments - Equity Method and Joint Ventures, and Derivatives and Hedging - Clarifying the Interactions Between Topic 321, Topic 323, and Topic 815”: In January 2020, the FASB issued a new standard intended to clarify the interactions between Accounting Standards Codification (ASC) 321, ASC 323 and ASC 815. The new standard addresses accounting for the transition into and out of the equity method and measurement of certain purchased options and forward contracts to acquire investments. The standard is effective for annual and interim periods beginning after December 15, 2020, with early adoption permitted. Adoption of the standard requires changes to be made prospectively. We adopted the new standard on January 1, 2021. The adoption of this standard did not have an impact on our financial condition and results of operations.

3.Acquisitions

Business Combinations

Achillion Pharmaceuticals, Inc.

In October 2019, Alexion entered into a definitive agreement to acquire Achillion Pharmaceuticals, Inc. (Achillion), a clinical-stage biopharmaceutical company focused on the development of oral Factor D inhibitors. Achillion was developing oral small molecule Factor D inhibitors to treat people with complement alternative pathway-mediated rare diseases, such as PNH and C3 glomerulopathy (C3G). Achillion had two clinical stage medicines in development, including danicopan (ACH-4471/ALXN2040) and ACH-5228 (ALXN2050).

The acquisition of Achillion closed on January 28, 2020. Under the terms of the agreement, we acquired all outstanding common stock of Achillion for $6.30 per share, or an aggregate of $926.2, inclusive of the settlement of Achillion's outstanding equity awards. The acquisition was funded with cash on hand. The transaction includes the potential for additional consideration in the form of non-tradeable contingent value rights (CVRs), which will be paid to Achillion shareholders if certain clinical and regulatory milestones are achieved within specified periods. These include $1.00 per share for the U.S. Food and Drug Administration (FDA) approval of danicopan and $1.00 per share for the initiation of a Phase III clinical trial in ACH-5228.

10

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

The transaction was accounted for as a business combination. The following table summarizes the total consideration transferred to acquire Achillion and the estimated fair value of the identified assets acquired and liabilities assumed at the acquisition date:

Consideration
Upfront payment to shareholders and option holders	$	926.2
Upfront payment, fair value of equity compensation attributable to the post-combination service period	(20.0)
Upfront cash paid, net	906.2
Contingent consideration	160.7
Contingent consideration, fair value of equity compensation attributable to the post-combination service period	(5.7)
Total consideration	$	1,061.2
Assets Acquired and Liabilities Assumed
Cash and cash equivalents	$	68.5
Marketable securities	106.1
In-process research & development assets (IPR&D)	918.0
Goodwill	37.8
Deferred tax liabilities, net	(62.9)
Other assets and liabilities, net	(6.3)
Total net assets acquired	$	1,061.2

Our accounting for this acquisition was finalized during the second quarter of 2020. Measurement period adjustments increased goodwill by $3.1 during the second quarter of 2020 due to purchase price allocation increases to deferred tax liabilities, net. Measurement period adjustments were recorded as a result of studies completed during the second quarter of 2020 to determine the tax deductibility of certain acquisition-related costs and the valuation of historical net operating loss and income tax credit carryforwards.

The initial fair value estimate of the contingent consideration in the form of non-tradeable CVRs was $160.7, which was recorded as a noncurrent liability in our condensed consolidated balance sheets, including $5.7 related to compensation attributable to the post-combination service period. We determined the fair value of these milestone-related payment obligations using various estimates, including probabilities of success prior to expiration of the specified period, discount rates and the amount of time until the conditions of the milestone payments are expected to be met. This fair value measurement was based on significant inputs not observable in the market, representing Level 3 measurements within the fair value hierarchy. The resulting probability-weighted cash flows were discounted using a cost of debt rate ranging from 2.1% to 2.3%. The range of estimated milestone payments upon closing of the acquisition was from zero, if no milestones are achieved for any product, to $306.3 if certain development and regulatory milestones are achieved.

Subsequent to the acquisition date, we have adjusted the contingent consideration to fair value with changes in fair value recognized in operating earnings. Changes in fair values reflect new information about the probability and timing of meeting the conditions of the milestone payments. In the absence of new information, changes in fair value will only reflect the interest component of contingent consideration related to changes in the discount rates and the passage of time as development work progresses towards the potential achievement of the milestones. As of March 31, 2021, the fair value of the contingent consideration for the Achillion acquisition was $212.8 based on the probability-weighted cash flows, discounted using a cost of debt ranging from 2.5% to 3.0%. Changes in fair value of the contingent consideration associated with the Achillion acquisition for the three months ended March 31, 2021 and 2020, was $2.2 and $1.7, respectively.

The aggregate fair value of equity compensation attributable to the post-combination service period was $25.7. This amount was excluded from the total consideration transferred and was recognized as a charge to acquisition-related costs in our condensed consolidated statements of operations during the first quarter 2020. These amounts were associated with the accelerated vesting of stock options previously granted to Achillion employees. Excluding the $5.7 of contingent consideration related to equity compensation attributable to the post-combination service period, such amounts were paid during the first quarter 2020.

11

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

Intangible assets associated with IPR&D relate to two development-stage programs, ACH-4471 (ALXN2040) and ACH-5228 (ALXN2050). The estimated fair value of $918.0 was determined using the excess earnings valuation method, a variation of the income valuation approach. The excess earnings valuation method estimates the value of an intangible asset equal to the present value of the incremental after-tax cash flows attributable to that intangible asset. Some of the more significant assumptions utilized in our asset valuations included the estimated net cash flows for each asset, including net revenues, cost of sales, research and development and other operating expenses, the potential regulatory and commercial success rates, competitive trends impacting the assets, and tax rates. The fair value using the excess earnings valuation method was determined using an estimated weighted average cost of capital for Achillion of 11.5%, which represents a rate of return that a market participant would expect for these assets. These fair value measurements were based on significant inputs not observable in the market and thus represent Level 3 fair value measurements. In the second quarter 2020, we recognized an impairment charge of $11.0 to write off our ACHN-4471 (ALXN2040) IPR&D asset due to clinical results received during the quarter.

The excess of purchase price over the fair value of the assets acquired and liabilities assumed represents the goodwill resulting from the acquisition. The goodwill, which is not tax-deductible, has been recorded as a noncurrent asset and is not amortized, but is subject to an annual review for impairment. The factors that contributed to the recognition of goodwill include the value of the acquired workforce, synergies that are specific to our business and not available to market participants, and early research in preclinical Factor D inhibitors, as well as the effects of the establishment of a deferred tax liability for the acquired IPR&D intangible assets, which has no tax basis.

We recorded a net deferred tax liability of $62.9, inclusive of measurement period adjustments recorded during the second quarter 2020. This amount was primarily comprised of $205.3 of deferred tax liabilities relating to the IPR&D acquired, offset by $142.4 of deferred tax assets related to net operating loss carryforwards (NOLs), income tax credits, and other temporary differences.

Achillion's results of operations are included in the condensed consolidated financial statements from the date of acquisition. For the three months ended March 31, 2020, we recorded $13.9 of pre-tax operating losses associated with the operations of Achillion in our condensed consolidated statements of operations. We also recorded acquisition-related costs in connection with the acquisition during the three months ended March 31, 2020 as presented below. No revenues were recorded in the results of operations for the three months ended March 31, 2020 as neither ALXN2040 nor ALXN2050 has been approved for commercial sale by any regulatory agency.

Portola Pharmaceuticals, Inc.

In May 2020, Alexion entered into a definitive merger agreement to acquire Portola Pharmaceuticals, Inc. (Portola), a commercial-stage biopharmaceutical company focused on life-threatening blood-related disorders. Portola’s commercialized medicine, ANDEXXA®, marketed as ONDEXXYA® in Europe, is the first and only approved Factor Xa inhibitor reversal agent, and has demonstrated transformative clinical value by rapidly reversing the anticoagulant effects of Factor Xa inhibitors rivaroxaban and apixaban in severe and uncontrolled bleeding. The acquisition provides the opportunity to grow Alexion's commercial portfolio and is a strategic fit with our existing expertise in acute care, hematology and neurology.

Alexion completed the acquisition through a tender offer and subsequent merger of Portola which closed on July 2, 2020. Under the terms of the tender offer and merger agreement, Alexion purchased all outstanding common stock of Portola for $18.00 per share, or an aggregate of approximately $1,380.8, including the settlement of certain of Portola's outstanding equity awards but excluding shares of Portola stock held by Alexion at closing. The acquisition was funded by cash on hand.

Prior to the acquisition of Portola, in March 2020 and April 2020, we purchased $14.5 and $3.6, respectively, of common stock of Portola, which we recorded at fair value. Upon the closing of the acquisition of Portola, the fair value of the equity investment of $47.8 was derecognized and included in the fair value of consideration transferred. For additional information on our Portola equity investment, refer to Note 11, Other Investments.

The aggregate fair value of equity compensation attributable to the post-combination service period was $11.1. This amount was excluded from the total consideration transferred and was recognized as a charge to acquisition-related costs in our condensed consolidated statements of operations during the third quarter of 2020. These amounts were primarily associated with the accelerated vesting of stock options previously granted to Portola employees and were paid during the third quarter 2020.

12

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

We issued $41.5 of equity compensation replacement awards, of which the portion attributable to services performed prior to the acquisition date, or $7.2, was allocated to purchase consideration. The remaining fair value is attributable to future services and will be expensed as share-based compensation over the remaining service periods. Expense associated with the accelerated-vesting of the replacement awards in connection with employee terminations will be recognized as acquisition-related employee separation costs.

In connection with the acquisition, Alexion also paid $196.9 to settle certain debt held by Portola that was subject to preexisting change of control provisions.

The transaction was accounted for as a business combination. The following table summarizes the total consideration transferred to acquire Portola and the estimated fair value of the identified assets acquired and liabilities assumed at the acquisition date:

Consideration
Upfront payment to shareholders and equity holders	$	1,380.8
Upfront payment, fair value of equity compensation attributable to the post-combination service period	(11.1)
Upfront cash paid, net	1,369.7
Fair value of equity shares held by Alexion at closing	47.8
Fair value of replacement equity awards attributable to the pre-combination period	7.2
Total consideration to acquire outstanding equity, net	1,424.7
Total consideration to settle preexisting debt	196.9
Total consideration	$	1,621.6
Assets Acquired and Liabilities Assumed
Cash and cash equivalents	$	288.5
Marketable securities	17.8
Inventories, including noncurrent portion of $169.1 and validation batches of $60.9	362.5
Intangible assets	1,051.0
Goodwill	24.9
Deferred tax assets, net	116.6
Other assets	41.9
Accounts payable and accrued expenses	(75.6)
Long-term debt, including current portion of $7.7	(182.0)
Other liabilities	(24.0)
Total net assets acquired	$	1,621.6

Our accounting for this acquisition was finalized during the fourth quarter of 2020. Measurement period adjustments decreased goodwill by $0.6 during the fourth quarter of 2020 due to purchase price allocation increases to deferred tax assets, net. Measurement period adjustments were recorded as a result of studies completed during the fourth quarter of 2020 to determine the tax deductibility of certain acquisition-related costs and the valuation of historical net operating loss and income tax credit carryforwards.

We acquired $362.5 of ANDEXXA inventory, inclusive of $60.9 of validation batches manufactured under processes which are subject to regulatory approval and expected to be commercially saleable following approval. The estimated fair value of raw material inventory was valued at replacement cost, which is equal to the value a market participant would pay to acquire the inventory. The estimated fair value of work-in-process and finished goods inventory was based on the expected selling price of the inventory, adjusted for incremental costs to complete the

13

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

manufacturing process, for direct selling efforts, and for a normal profit on the remaining manufacturing and selling costs. Additionally, as the inventory acquired, inclusive of validation batches, is expected to be realized over a period of approximately 3 years, the fair value of the inventory was determined using a discount rate of 17.5%, representing the rate of return that a market participant would expect for the inventory, which shares risk that is similar to the underlying intellectual property. These fair value measurements were based on significant inputs not observable in the market and thus represent Level 3 fair value measurements. The acquired inventory, inclusive of the acquisition-date fair value step-up, will be expensed within cost of sales as the inventory is sold to customers. We classified the ANDEXXA inventory that is expected to be utilized beyond our normal operating cycle as a long-term asset. The fair value of the non-current portion of inventory, in addition to the validation batches, are classified within other assets in our condensed consolidated balance sheets.

Intangible assets consist of purchased technology of $1,036.0 and IPR&D of $15.0. The purchased technology intangible asset relates to Portola's lead product ANDEXXA. The estimated fair value was determined using the excess earnings valuation method, a variation of the income valuation approach. The excess earnings valuation method estimates the value of an intangible asset equal to the present value of the incremental after-tax cash flows attributable to that intangible asset. Some of the more significant assumptions utilized in our asset valuation included the estimated net cash flows for ANDEXXA, including net revenues, cost of sales, research and development and other operating expenses, the potential regulatory and commercial success rates associated with ANDEXXA's current conditional approval status and planned extension into the urgent surgery setting, competitive trends impacting the assets, and tax rates. The fair value using the excess earnings valuation method was determined using a discount rate commensurate with the risks of ANDEXXA of 17.5%, which represents a rate of return that a market participant would expect for the asset. The acquired purchased technology intangible asset is being amortized over an estimated useful life of approximately 10 years. IPR&D relates to the cerdulatinib development-stage asset. The estimated fair value of the IPR&D asset was determined using a relief from royalty (RFR) method, a variation of the income approach that is based on the cost savings that accrue to the owner of an intangible asset who would otherwise have to pay royalties on revenues earned through the use of the asset. The RFR method was modified to reflect the cash flow forecast of Portola's pre-existing in-license of cerdulatinib from Astellas Pharma, Inc. The acquired fair value of $15.0 represents an increase in the value of the asset relative to when it was initially in-licensed by Portola. Some of the more significant assumptions utilized in the IPR&D asset valuation included the estimated net revenue, royalty rate, and tax rates. The fair value using the RFR method was determined using an estimated discount rate commensurate with the risks of cerdulatinib of 17.5%, which represents a rate of return that a market participant would expect for the asset. These fair value measurements were based on significant inputs not observable in the market and thus represent Level 3 fair value measurements.

In connection with the acquisition, we assumed royalty-based debt which requires repayment through tiered royalties on future net worldwide sales of ANDEXXA. Total potential royalty payments are capped at $290.6, of which $13.7 were paid by Portola prior to the acquisition. The fair value of the remaining $276.9 in royalty-based payments as of the date of acquisition was $182.0. The estimated fair value was measured using Level 3 inputs and was calculated using a real options method, which runs simulations using various estimates, including probability-weighted net sales of ANDEXXA and volatility. Using the simulation results, the fair value was calculated based on the expected probability-weighted risk-neutral royalties, discounted at our estimated cost of debt, ranging from 3.3% to 7.1%, commensurate with the cost of debt at each period in which the royalty-based payments are estimated to be made.

We recorded net deferred tax assets of $116.6, inclusive of measurement period adjustments recorded during the fourth quarter 2020. This amount was primarily comprised of $301.6, $41.8, $42.4 and $39.3 of deferred tax assets relating to net operating loss carryforwards (NOLs), income tax credits, royalty-based debt, and other temporary differences, respectively, offset by $245.1 and $63.4 of deferred tax liabilities relating to intangible assets acquired and inventory fair value adjustments, respectively.

The excess of purchase price over the fair value of the assets acquired and liabilities assumed represents the goodwill resulting from the acquisition. The goodwill, which is not tax-deductible, has been recorded as a noncurrent asset and is not amortized, but is subject to an annual review for impairment. The factors that contributed to the recognition of goodwill primarily include the value of the acquired workforce and the effects of the establishment of a deferred tax liability for the fair value step-up of acquired inventory and intangible assets which exceed the incremental book value of acquired deferred tax assets over their fair value.

14

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

Pro forma financial information (unaudited)

The following unaudited pro forma information presents the combined results of Alexion and Achillion as if the acquisition of Achillion had been completed on January 1, 2019, with adjustments to give effect to pro forma events that are directly attributable to the acquisition. The unaudited pro forma results do not reflect operating efficiencies or potential cost savings that may have resulted from the consolidation of operations. Accordingly, the unaudited pro forma financial information is not necessarily indicative of the results of operations had we completed the transaction on January 1, 2019.

	Three months ended March 31,
	2020		2019
Pro forma revenue	$	1,444.8	$	1,140.4
Pro forma net income	$	574.9	$	515.7

The unaudited pro forma consolidated results include pro forma adjustments related to non-recurring activity. Alexion and Achillion acquisition-related costs of $53.3, net of tax, were excluded from income for the three months ended March 31, 2020. These expenses were included in net income for the three months ended March 31, 2019.

Acquisition-Related Costs

Acquisition-related costs recorded within the condensed consolidated statements of operations associated with our acquisitions of Achillion and Portola and our definitive merger agreement with AstraZeneca for the three months ended March 31, 2021 and 2020 include the following:

	Three months ended March 31
	2021		2020
Transaction costs (1)	$	5.4	$	1.4
Integration costs	4.1		0.1
Fair value of equity compensation attributable to the post-combination service period	—		25.7
Employee costs (2)	3.7		10.9
	$	13.2	$	38.1

(1) Transaction costs primarily include legal fees. First quarter 2020 transaction costs also include costs to effectuate the settlement of the Achillion outstanding options

(2) Employee separation costs include severance payments and costs associated with one-time short-term retention awards

Acquisition-related costs attributable to the Merger Agreement with AstraZeneca for the three months ended March 31, 2021 were $8.2. Acquisition-related costs attributable to the Portola acquisition for the three months ended March 31, 2021 were $5.0. Acquisition-related costs attributable to the Achillion acquisition for the three months ended March 31, 2020 were $38.1.

15

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

4.Inventories

The components of inventory are as follows:

	March 31,		December 31,
	2021		2020
Raw materials	$	97.8	$	91.2
Work-in-process	324.7		260.8
Finished goods	489.6		510.3
Total inventories	$	912.1	$	862.3
Balance Sheet Classification:
Inventories	$	803.9	$	775.7
Other assets	$	108.2	$	86.6

The acquired ANDEXXA inventory includes the acquisition-date fair value step-up, which is expensed within cost of sales as the inventory is sold to customers. For additional information on our acquisition of Portola, please refer to Note 3, Acquisitions.

We classify our inventory as long-term when we expect to utilize the inventory beyond our normal operating cycle and include these costs in other assets in our condensed consolidated balance sheets. Inventories classified as long-term relate to ULTOMIRIS 100mg/ml inventory and ANDEXXA inventory, including inventory acquired in connection with the Portola acquisition.

As of March 31, 2021 and December 31, 2020, the carrying value of capitalized inventory manufactured at production facilities and through manufacturing processes that have not yet received regulatory approval was $86.1 and $39.8, respectively. All such inventory as of March 31, 2021 received regulatory approval in April 2021.

5.Intangible Assets and Goodwill

The following table summarizes the carrying amount of our intangible assets and goodwill, net of accumulated amortization and impairment charges: 

		March 31, 2021							December 31, 2020
	Estimated Life (years)	Cost		Accumulated Amortization			Net		Cost		Accumulated Amortization			Net
Licensing rights	3-8	$	57.0	$	(39.4)		$	17.6	$	57.0	$	(38.5)		$	18.5
Patents	7	10.5		(10.5)			—		10.5		(10.5)			—
Purchased technology	6-16	5,746.5		(3,737.9)		(a)	2,008.6		5,746.5		(3,684.7)		(a)	2,061.8
Other intangibles	5	0.4		(0.3)			0.1		0.4		(0.3)			0.1
Priority review voucher	Indefinite	100.0		—			100.0		—		—			—
Acquired IPR&D	Indefinite	922.0		—			922.0		922.0		—			922.0
Total		$	6,836.4	$	(3,788.1)		$	3,048.3	$	6,736.4	$	(3,734.0)		$	3,002.4
Goodwill	Indefinite	$	5,103.0	$	(2.9)		$	5,100.1	$	5,103.0	$	(2.9)		$	5,100.1
(a) Includes an impairment charge of $2,042.3 recognized during the second quarter 2020 related to the KANUMA intangible asset

In January 2021, we entered into a definitive asset purchase agreement with Rhythm Pharmaceuticals, Inc. (“Rhythm”) to acquire its Rare Pediatric Disease Priority Review Voucher (PRV) for $100.0, inclusive of transaction costs. The acquisition of the PRV closed on February 17, 2021. As there is probable future economic benefit from the PRV, we capitalized the $100.0 payment as an indefinite-lived intangible asset.

Amortization expense for the three months ended March 31, 2021 and 2020 was $54.1 and $74.7, respectively. As of March 31, 2021, assuming no changes in the gross cost basis of intangible assets, the total estimated amortization expense for finite-lived intangible assets is $162.4 for the nine months ending December 31, 2021, and approximately $216.0 for each of the years ending December 31, 2022 through December 31, 2026.

16

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

6.Debt

Credit Agreement

On June 7, 2018, we entered into an Amended and Restated Credit Agreement (the Credit Agreement), with Bank of America, N.A. as Administrative Agent. The Credit Agreement amended and restated our credit agreement dated as of June 22, 2015 (the Prior Credit Agreement).

The Credit Agreement provides for a $1,000.0 revolving credit facility and a $2,612.5 term loan facility. The revolving credit facility and the term loan facility mature on June 7, 2023. Beginning with the quarter ended June 30, 2019, we are required to make payments of 5.0% of the original principal amount of the term loan facility annually, payable in equal quarterly installments.

In connection with entering into the Credit Agreement and the Prior Credit Agreement, we paid an aggregate of $53.1 in financing costs in 2018. Financing costs are amortized as interest expense over the life of the debt. Amortization expense associated with deferred financing costs for the three months ended March 31, 2021 and 2020 was $1.2. Remaining unamortized deferred financing costs as of March 31, 2021 and December 31, 2020 were $9.9 and $11.1, respectively.

We made principal payments of $32.6 on the term loan during the three months ended March 31, 2021, and as of March 31, 2021, we had $2,351.3 outstanding on the term loan. We had no outstanding borrowings under the revolving credit facility as of March 31, 2021. As of March 31, 2021, we had open letters of credit of $1.0 that offset our availability in the revolving facility.

The amount outstanding under the term loan of $2,351.3 as of March 31, 2021 is subject to variable interest rates, which are based on current market rates, and as such, the Company believes the carrying amount of the obligation approximates fair value.

We were in compliance with all applicable covenants under the Credit Agreement as of March 31, 2021. In connection with the planned merger with AstraZeneca, we evaluated the terms of the Credit Agreement and determined the agreement could require acceleration of payments upon a change of control.

Royalty-based Financing

In connection with our acquisition of Portola during the third quarter 2020, we assumed royalty-based debt relating to a royalty sales agreement Portola had entered into with HealthCare Royalty Partners (HCR) whereby HCR acquired a tiered royalty interest in future worldwide net sales of ANDEXXA. Portola received $50.0 upon closing of the agreement in February 2017 and an additional $100.0 following the U.S. regulatory approval of ANDEXXA in May 2018. Tiered royalties ranging from 4.2% to 8.5% are required to be paid to HCR based on net worldwide sales of ANDEXXA. The applicable rate decreases as worldwide net annual sales levels increase above defined thresholds. Total potential royalty payments are capped at 195.0% of the funding received less certain transaction expenses, or $290.6. As of the date of acquisition, the remaining due to HCR was $276.9 in royalty-based payments.

We recorded the HCR debt at its fair value of $182.0 upon closing of the acquisition, representing an initial debt discount of $94.9. We have also recognized a deferred tax asset of $42.4 related to the royalty-based debt as of the acquisition date. For additional information on our acquisition of Portola, please refer to Note 3, Acquisitions. Interest expense is recognized using the effective interest rate method over the estimated period the related debt will be paid. This requires estimation of the timing and amount of future royalty payments to be generated from future sales of ANDEXXA. We reassess the expected royalty payments each reporting period and account for any changes through an adjustment to the effective interest rate on a prospective basis. The assumptions used in determining the expected repayment term of the debt require that we make estimates that could impact the short and long term classification of the debt carrying values.

Each period, we amortize the initial debt discount using the effective interest rate implied from the projected timing of royalty payments to HCR. The effective interest rate for the HCR royalty-based debt as of March 31, 2021 was 11.4%. During the three months ended March 31, 2021, we recognized interest expense associated with the amortization of the debt discount of $5.0. We made royalty-based debt payments of $3.3 during the three months ended March 31, 2021. As of March 31, 2021, the carrying value of the royalty-based debt includes approximately $2.5 of royalty payments on first quarter sales of ANDEXXA which will be paid during the second quarter of 2021.

As of March 31, 2021, the carrying value of the HCR royalty-based debt was $188.7, of which $16.3 was recorded within current portion of long-term debt and $172.4 was recorded within long-term debt, less current portion on our condensed consolidated balance sheets. As of December 31, 2020, the carrying value of the HCR royalty-

17

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

based debt was $187.0, of which $15.5 was recorded within current portion of long-term debt and $171.5 was recorded within long-term debt, less current portion on our condensed consolidated balance sheets.

Our payment obligations for HCR royalty-based debt are as follows:

	Three Months Ended March 31, 2021
Total repayment obligation as of December 31, 2020	$	271.9
Less: Interest to be accreted in future periods	(79.9)
Less: Payments made	(3.3)
Carrying value as of March 31, 2021	$	188.7

The carrying value of the royalty-based debt as of March 31, 2021 approximates fair value.

7.Earnings Per Common Share

Basic earnings per common share (EPS) is computed by dividing net income attributable to Alexion by the weighted-average number of shares of common stock outstanding attributable to Alexion. For purposes of calculating diluted EPS, the denominator reflects the potential dilution that could occur if stock options, unvested restricted stock units or other contracts to issue common stock were exercised or converted into common stock, using the treasury stock method.

The following table summarizes the calculation of basic and diluted EPS for the three months ended March 31, 2021 and 2020:

	Three months ended
	March 31,
	2021		2020
Net income attributable to Alexion	$	636.0	$	557.6
Shares used in computing earnings per common share attributable to Alexion —basic	220.1		221.6
Weighted-average effect of dilutive securities:
Stock awards	2.5		1.0
Shares used in computing earnings per common share attributable to Alexion —diluted	222.6		222.6
Earnings per common share attributable to Alexion:
Basic	$	2.89	$	2.52
Diluted	$	2.86	$	2.50

We exclude from EPS the weighted-average number of securities whose effect is anti-dilutive. Excluded from the calculation of EPS for the three months ended March 31, 2021 and 2020 were 0.8 and 3.2 shares of Alexion common stock, respectively, because their effect is anti-dilutive.

8.Marketable Securities

The proceeds from maturities and sales of available-for-sale debt securities and resulting realized gains and losses are summarized below. In the second quarter of 2020 we liquidated all of our available-for-sale securities and in the third quarter of 2020 we liquidated all available-for-sale debt securities acquired in connection with the Portola acquisition.

18

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

	Three months ended
	March 31,
	2021		2020
Proceeds from maturities and sales (1)	$	—	$	812.5
Realized gains	$	—	$	—
Realized losses	$	—	$	—
(1) Proceeds from maturities and sales of available-for-sale debt securities include securities previously classified as cash and cash equivalents and marketable securities in the condensed consolidated balance sheets.

We utilize the specific identification method in computing realized gains and losses.

As a result of our liquidation of all available-for-sale debt securities during 2020, we have no remaining available-for-sale debt securities as of March 31, 2021 and December 31, 2020.

We sponsor a nonqualified deferred compensation plan which allows certain highly compensated employees to elect to defer income to future periods. Participants in the plan earn a return on their deferrals based on several investment options, which mirror returns on underlying mutual fund investments. We choose to invest in the underlying mutual fund investments to offset the liability associated with our nonqualified deferred compensation plan. These mutual fund investments are valued at net asset value per share and are carried at fair value with gains and losses included in investment income. The changes in the underlying liability to the employee are recorded in operating expenses. As of March 31, 2021 and December 31, 2020, the fair value of these investments was $39.7 and $34.9, respectively.

9.Derivative Instruments and Hedging Activities

We operate internationally and, in the normal course of business, are exposed to fluctuations in foreign currency exchange rates. The exposures result from portions of our revenues, as well as the related receivables, and expenses that are denominated in currencies other than the U.S. dollar, primarily the Euro and Japanese Yen. We are also exposed to fluctuations in interest rates on outstanding borrowings under our revolving credit facility, if any, and term loan facility. We manage these exposures within specified guidelines through the use of derivatives. All of our derivative instruments are utilized for risk management purposes, and we do not use derivatives for speculative trading purposes.

We enter into foreign exchange forward contracts to hedge exposures resulting from portions of our forecasted revenues, including intercompany revenues that are denominated in currencies other than the U.S. dollar. Revenue foreign exchange forward contracts in effect as of March 31, 2021 had durations of up to 23 months. The purpose of these hedges is to reduce the volatility of exchange rate fluctuations on our operating results. These hedges are designated as cash flow hedges upon contract inception. As of March 31, 2021, we had open revenue related foreign exchange forward contracts with notional amounts totaling $853.3 that qualified for hedge accounting with current contract maturities through June 2022.

To achieve a desired mix of floating and fixed interest rates on our term loan, we enter into interest rate swap agreements that qualify for and are designated as cash flow hedges. These contracts convert the floating interest rate on a portion of our debt to a fixed rate, plus a borrowing spread.

The following table summarizes the total interest rate swap contracts executed as of March 31, 2021:

Type of Interest Rate Swap Contract	Notional Amount	Effective Date	Termination Date	Fixed Interest Rate or Rate Range
Floating to Fixed	$450.0	December 2018	December 2022	2.60% - 2.79%
Floating to Fixed	$1,300.0	December 2019	December 2022	2.37% - 2.83%

The amount of gains and (losses) recognized in the condensed consolidated statements of operations for the three months ended March 31, 2021 and 2020 from foreign exchange and interest rate swap contracts that qualified as cash flow hedges were as follows:

19

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

	Three months ended				Three months ended
	March 31, 2021				March 31, 2020
Financial Statement Line Item in which the Effects of Cash Flow Hedges are Recorded	Net Product Sales		Interest Expense		Net Product Sales		Interest Expense
Total amount presented in the Condensed Consolidated Statements of Operations	$	1,635.7	$	(27.1)	$	1,444.6	$	(25.8)
Impact of cash flow hedging relationships:
Foreign exchange forward contracts	$	(11.8)	$	—	$	11.4	$	—
Interest rate contracts	$	—	$	(11.4)	$	—	$	(4.6)

The impact on accumulated other comprehensive income (AOCI) and earnings from foreign exchange and interest rate swap contracts that qualified as cash flow hedges, for the three months ended March 31, 2021 and 2020 were as follows:

	Three months ended
	March 31,
	2021		2020
Foreign Exchange Forward Contracts:
Gain recognized in AOCI, net of tax	$	33.4	$	26.0
(Loss) gain reclassified from AOCI to net product sales, net of tax	$	(9.1)	$	8.8
Interest Rate Swap Contracts:
Gain (loss) recognized in AOCI, net of tax	$	1.0	$	(47.3)
Loss reclassified from AOCI to interest expense, net of tax	$	(8.8)	$	(3.6)

Assuming no change in foreign exchange rates from market rates as of March 31, 2021, $9.7 of gains recognized in AOCI will be reclassified to revenue over the next 12 months. Assuming no change in LIBOR-based interest rates from market rates as of March 31, 2021, $45.7 of losses recognized in AOCI will be reclassified to interest expense over the next 12 months.

We enter into foreign exchange forward contracts designed to limit the balance sheet exposure of monetary assets and liabilities. We enter into these hedges to reduce the impact of fluctuating exchange rates on our operating results. Balance sheet hedges related to foreign exchange forward contracts in effect as of March 31, 2021 had durations of up to 3 months. Hedge accounting is not applied to these derivative instruments as gains and losses on these hedge transactions are designed to offset gains and losses on underlying balance sheet exposures. As of March 31, 2021, the notional amount of foreign exchange contracts where hedge accounting is not applied was $1,126.5.

We recognized a gain of $12.2 and $16.2, in other income and (expense) for the three months ended March 31, 2021 and 2020, respectively, associated with the foreign exchange contracts not designated as hedging instruments. These amounts were partially offset by gains or losses on monetary assets and liabilities.

20

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

The following tables summarize the fair value of outstanding derivatives as of March 31, 2021 and December 31, 2020: 

	March 31, 2021
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments:
Foreign exchange forward contracts	Prepaid expenses and other current assets	$	19.2	Other current liabilities	$	9.4
Foreign exchange forward contracts	Other assets	0.1		Other liabilities	—
Interest rate contracts	Prepaid expenses and other current assets	—		Other current liabilities	45.7
Interest rate contracts	Other assets	—		Other liabilities	32.9
Derivatives not designated as hedging instruments:
Foreign exchange forward contracts	Prepaid expenses and other current assets	22.3		Other current liabilities	12.2
Total fair value of derivative instruments		$	41.6		$	100.2

	December 31, 2020
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments:
Foreign exchange forward contracts	Prepaid expenses and other current assets	$	—	Other current liabilities	$	44.3
Foreign exchange forward contracts	Other assets	—		Other liabilities	1.2
Interest rate contracts	Prepaid expenses and other current assets	—		Other current liabilities	45.9
Interest rate contracts	Other assets	—		Other liabilities	45.4
Derivatives not designated as hedging instruments:
Foreign exchange forward contracts	Prepaid expenses and other current assets	26.1		Other current liabilities	35.8
Total fair value of derivative instruments		$	26.1		$	172.6

21

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

Although we do not offset derivative assets and liabilities within our condensed consolidated balance sheets, our International Swap and Derivatives Association agreements provide for net settlement of transactions that are due to or from the same counterparty upon early termination of the agreement due to an event of default or other termination event. The following tables summarize the potential effect on our condensed consolidated balance sheets of offsetting our foreign exchange forward contracts and interest rate contracts subject to such provisions:

	March 31, 2021
							Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet
Description	Gross Amounts of Recognized Assets/Liabilities		Gross Amounts Offset in the Condensed Consolidated Balance Sheet		Net Amounts of Assets/Liabilities Presented in the Condensed Consolidated Balance Sheet		Derivative Financial Instruments		Cash Collateral Received (Pledged)		Net Amount
Derivative assets	$	41.6	$	—	$	41.6	$	(21.3)	$	—	$	20.3
Derivative liabilities	$	(100.2)	$	—	$	(100.2)	$	21.3	$	—	$	(78.9)

	December 31, 2020
							Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet
Description	Gross Amounts of Recognized Assets/Liabilities		Gross Amounts Offset in the Condensed Consolidated Balance Sheet		Net Amounts of Assets/Liabilities Presented in the Condensed Consolidated Balance Sheet		Derivative Financial Instruments		Cash Collateral Received (Pledged)		Net Amount
Derivative assets	$	26.1	$	—	$	26.1	$	(26.1)	$	—	$	—
Derivative liabilities	$	(172.6)	$	—	$	(172.6)	$	26.1	$	—	$	(146.5)

10.Caelum Biosciences

Background

In January 2019, we entered into an agreement with Caelum, a biotechnology company that is developing CAEL101 for light chain (AL) amyloidosis. Under the terms of the agreement, we acquired a minority equity interest in preferred stock of Caelum and an exclusive option to acquire the remaining equity in Caelum based on Phase II data, for pre-negotiated economics. We paid $30.0 in the first quarter 2019 and agreed to pay up to an additional $30.0 in contingent development milestones prior to the exercise of the option to acquire the remaining equity in Caelum. These contingent payments met the definition of a derivative liability and were initially recorded at fair value of $27.1, based on the probability-weighted cash flows, discounted using a cost of debt ranging from 3.3% to 3.5%. We allocated the total consideration of $57.1, inclusive of the fair value of the contingent payments, to the equity investment in Caelum and the option to acquire the remaining equity in Caelum based on the relative fair values of the assets.

Following discussions with the FDA, Caelum changed its clinical development plan for CAEL-101 in the fourth quarter 2019. In December 2019, we amended the terms of the agreement with Caelum to modify the option to acquire the remaining equity in Caelum based on data from the modified Phase II/III trials. The amendment also modified the development-related milestone events associated with the initial $30.0 in contingent payments, provided for an additional $20.0 in upfront funding, as well as funding of $60.0 in exchange for an additional equity interest at fair value upon achievement of a specific development-related milestone event.

In December 2019, we accounted for the amendment as an exchange transaction as the terms of the modified option were determined to be substantially different than the terms of the original option. In conjunction with this amendment, we recognized a gain of $32.0 during the fourth quarter 2019 in other income and (expense), which reflected an increase in the fair value of the option, less $20.0 in incremental upfront funding which we accrued as of December 31, 2019 and paid during the first quarter 2020, and $4.1 associated with the change in the fair value of contingent payments which we also modified as part of the amendment.

22

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

A Phase II trial for CAEL-101 subsequently commenced during the first quarter of 2020 and met its primary objectives, supporting the safety and tolerability of CAEL-101 and confirmed the dose and regimen to be adopted for the Phase III studies. In September 2020, Alexion and Caelum announced the initiation of the Cardiac Amyloid Reaching for Extended Survival (CARES) program. This includes two parallel Phase III trials to evaluate the survival benefits of CAEL-101.

In December 2020, in connection with entering into the Merger Agreement with AstraZeneca (refer to Note 1, Business), we determined that the fair value of our option to acquire the remaining equity of Caelum decreased as a result of a change to the expected option exercise date. This resulted in a $49.0 impairment charge which we recorded to investment income, net. The carrying value of the preferred stock was unaffected.

In March 2021, we amended the terms of our agreement with Caelum. The amended terms with Caelum modified the previously agreed upon funding of $60.0 in exchange for additional equity and included provisions to provide additional support to Caelum. Upon execution of the second amendment in March 2021, we provided $46.0 to Caelum in exchange for preferred equity and agreed to pay $14.0 upon achievement of a specified development milestone. We also committed to provide services to Caelum at no cost and to reimburse Caelum for costs incurred for incremental clinical trial activities that we requested be completed.

We continue to hold a minority equity interest in Caelum. Including the equity acquired in connection with the execution of the second amendment, we hold a 33.3% fully-diluted interest in Caelum as of March 31, 2021.

In the event we exercise the exclusive purchase option, the agreement provides for additional payments to Caelum for up to $500.0, which includes an upfront option exercise payment of $150.0 and potential regulatory and commercial milestone payments of up to $350.0. The pending acquisition of Alexion by AstraZeneca will accelerate the expiration period of the exclusive purchase option to 6-months after the close of the acquisition.

Our arrangement with Caelum, including through our preferred equity investments, provides Alexion the obligation to absorb losses and the right to receive benefits from Caelum. From the date of the initial agreement in January 2019 up until the date of the second amendment in March 2021, Caelum was not consolidated in our condensed consolidated financial statements as we did not have the power to direct the activities of Caelum that most significantly impact its economic performance, notably the completion of the clinical trials and activities to support regulatory approval of CAEL-101. As a result of the second amendment in March 2021, we became the primary beneficiary of Caelum and began consolidating Caelum as the incremental funding and support for clinical trial activities provides us the deemed power to direct the activities of Caelum that most significantly impact its economic performance.

Accounting for Caelum as a Consolidated VIE

Upon the initial consolidation of Caelum in March 2021, we recorded a $161.0 noncontrolling interest and derecognized our equity investment and purchase option of $41.0 and $15.0, respectively. Additionally, we recorded net assets of $217.0, comprised of cash and cash equivalents and other assets and liabilities, net in our condensed consolidated balance sheets. Caelum is a VIE that does not meet the definition of a business and as a result, no goodwill was recognized. The following table summarizes the assets acquired and liabilities assumed in connection with the consolidation of Caelum:

Assets Acquired and Liabilities Assumed
Cash and cash equivalents	$	16.9
Acquired in-process research and development	193.3
Other assets and liabilities, net	6.8
Total net assets acquired	$	217.0

Substantially all of the fair value of the gross assets of Caelum is concentrated in a single in-process research and development asset, CAEL-101. Due to the stage of development of this asset at the date of consolidation, significant risk remained and it was not yet probable that there was future economic benefit from this asset. Absent successful clinical results and regulatory approval for the asset, there is no alternative future use associated with CAEL-101. Accordingly, the value of this asset was expensed during the first quarter of 2021.

Caelum net loss included in our condensed consolidated statements of operations was $196.0, including acquired in-process research and development of $193.3, for the three months ended March 31, 2021, of which

23

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

$146.8 was attributed to the noncontrolling interest. The carrying value of the assets and liabilities associated with Caelum included in the condensed consolidated balance sheets as of March 31, 2021, which are limited in use for its operations and do not have recourse against our general credit are as follows:

	March 31, 2021
Cash and cash equivalents	$	56.5
Prepaid expenses and other current assets	$	8.6
Other assets	$	7.8
Accounts payable	$	3.6
Accrued expenses	$	2.3

Accounting for Caelum Prior to Consolidation

Prior to our consolidation of Caelum in March 2021, we recognized our equity investment in Caelum and the option to acquire the remaining equity in Caelum within other assets in our condensed consolidated balance sheets. As our equity investment in Caelum and option to acquire the remaining equity in Caelum did not have readily determinable fair values, we only adjusted the carrying value of the assets for impairment and any subsequent changes resulting from an observable price change in an orderly transaction for identical or similar equity securities of the same issuer. There were no observable price changes or impairments associated with these assets during the three months ended March 31, 2021 prior to consolidation or during the three months ended March 31, 2020.

In addition to our equity investment, we recognized the $30.0 in contingent development milestones at fair value as a derivative liability during 2020. We paid the associated development milestones in the second and third quarters of 2020 and as a result reduced the derivative liability balance to zero. Each reporting period, we adjusted the derivative liability associated with the contingent payments to fair value with changes in fair value recognized in other income and (expense). Changes in fair values reflected new information about the probability and anticipated timing of meeting the conditions of the milestone payments. In the absence of new information, changes in fair value reflected the interest component of the liability related to the passage of time. We recorded $2.3 of expense in other income and (expense) during the three months ended March 31, 2020 related to the change in the fair value of the liability. No expense was recognized during the three months ended March 31, 2021 as the derivative liability was previously settled.

11.Other Investments    

Other investments include strategic investments in equity securities of certain biotechnology companies which we acquired in connection with strategic business development transactions, including license and option agreements. These investments are included in other assets in our condensed consolidated balance sheets.

Dicerna

In October 2018, we purchased $10.3 of Dicerna Pharmaceuticals Inc. (Dicerna) common stock in connection with an agreement that we entered into with Dicerna, a publicly-traded biopharmaceutical company. As our equity investment in Dicerna common stock has a readily determinable fair value, we are recording the investment at fair value. During the three months ended March 31, 2021 and 2020, we recognized an unrealized gain of $3.0 and unrealized loss of $3.1, respectively, in investment income to adjust our equity investment in Dicerna to fair value.

The fair value of this investment was $21.4 and $18.4 as of March 31, 2021 and December 31, 2020, respectively.

Zealand

In March 2019, we purchased $13.8 (Kr. 90.9) of Zealand Pharma A/S (Zealand) common stock in connection with an agreement that we entered into with Zealand, a publicly-traded biopharmaceutical company based in Copenhagen, Denmark. Refer to Note 17, Commitments and Contingencies, for additional information on the agreement. As our equity investment in Zealand common stock has a readily determinable fair value, we are recording the investment at fair value. During the three months ended March 31, 2021 and 2020, we recognized an unrealized loss of $2.5 and $0.2, respectively, in investment income to adjust our equity investment in Zealand to fair value.

24

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

The fair value of this investment was $25.4 and $29.1 as of March 31, 2021 and December 31, 2020, respectively.

BridgeBio (Eidos)

In September 2019, we purchased $19.9 of Eidos Therapeutics, Inc. (Eidos) common stock, in connection with an agreement that we entered into with Eidos, a publicly-traded biopharmaceutical company and subsidiary of BridgeBio Pharma, Inc. Refer to Note 17, Commitments and Contingencies, for additional information on the agreement. In January 2021, BridgeBio Pharma, Inc. (BridgeBio) completed its acquisition of all the outstanding shares of Eidos common stock that BridgeBio did not already own at which time we received 1.85 shares of BridgeBio common stock for each share of Eidos common stock previously held. As our equity investment in BridgeBio common stock has a readily determinable fair value, we are recording the investment at fair value. During the three months ended March 31, 2021 and 2020, we recognized an unrealized loss of $9.8 and $3.7, respectively, in investment income to adjust our equity investment in BridgeBio (formerly Eidos) to fair value.

The fair value of this investment was $63.4 and $73.2 as of March 31, 2021 and December 31, 2020, respectively.

Portola

In March 2020 and April 2020, we purchased $14.5 and $3.6, respectively, of common stock of Portola Pharmaceuticals, Inc., a publicly traded commercial-stage biological company which we acquired on July 2, 2020. As our equity investment in Portola common stock had a readily determinable fair value, we recorded the investment at fair value. During the three months ended March 31, 2020, we recognized an unrealized gain of $0.6, in investment income to adjust our equity investment in Portola to fair value. Upon the closing of the acquisition of Portola on July 2, 2020, the fair value of the equity investment of $47.8 was derecognized and included in the fair value of consideration transferred, resulting in a realized gain of $29.7 in investment income on our initial investment. Refer to Note 3, Acquisitions, for additional information.

Inozyme

On July 17, 2020, we sold certain intellectual property rights and assets focusing on ENPP1 gene deficiencies to Inozyme Pharma (Inozyme), a publicly traded biopharmaceutical company, in exchange for $14.8 of Inozyme Pharma common stock, which was initially recorded at its IPO offering price, net of the effects of a nine month holding period restriction. We recognized the $14.8 of consideration received as a gain within gain on sale of assets in our condensed consolidated statements of operations in the third quarter of 2020. As our equity investment in Inozyme common stock has a readily determinable fair value, we are recording the investment at fair value. We have considered the effects of the holding period restriction and determined that the impact on the fair value of the investment is immaterial as of March 31, 2021. During the three months ended March 31, 2021, we recognized an unrealized gain of $1.5, in investment income to adjust our investment in Inozyme to fair value.

The fair value of this investment was $22.0 and $20.5 as of March 31, 2021 and December 31, 2020, respectively.

Other Strategic Investments

We have other strategic investments in equity securities of $5.8 and $2.6 as of March 31, 2021 and December 31, 2020, respectively. During the three months ended March 31, 2021 and 2020, purchases relating to these investments were immaterial and we recognized immaterial losses in investment income related to these investments.

25

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

12.Stockholders' Equity

Share Repurchases

In November 2012, our Board of Directors authorized a share repurchase program. In February 2017, our Board of Directors increased the amount that we are authorized to expend on future repurchases to $1,000.0 under our repurchase program, which superseded all prior repurchase programs. The entire amount authorized pursuant to this February 2017 Board approval has been utilized. On October 22, 2019, the Board of Directors approved a share repurchase authorization of up to $1,000.0. On July 28, 2020, the Board of Directors approved a new share repurchase authorization of up to an additional $1,500.0. The repurchase program does not have an expiration date and we are not obligated to acquire a particular number of shares. The repurchase program may be discontinued at any time at our discretion. We did not repurchase shares of our common stock during the three months ended March 31, 2021. Under the program, we repurchased 1.3 shares of our common stock at a cost of $107.1 during the three months ended March 31, 2020. As of March 31, 2021, there is a total of $2,024.7 remaining for repurchases under the repurchase programs.

13.Other Comprehensive Income and Accumulated Other Comprehensive Income

The following tables summarize the changes in AOCI, by component, for the three months ended March 31, 2021 and 2020:

	Defined Benefit Pension Plans		Unrealized Gains (Losses) from Debt Securities		Unrealized Gains (Losses) from Hedging Activities		Foreign Currency Translation Adjustment		Total Accumulated Other Comprehensive Income (Loss)
Balances, December 31, 2020	$	(10.2)	$	—	$	(102.7)	$	(11.7)	$	(124.6)
Other comprehensive income (loss) before reclassifications	—		—		34.6		(13.1)		21.5
Amounts reclassified from other comprehensive income	—		—		17.9		—		17.9
Net other comprehensive income (loss)	—		—		52.5		(13.1)		39.4
Balances, March 31, 2021	$	(10.2)	$	—	$	(50.2)	$	(24.8)	$	(85.2)

	Defined Benefit Pension Plans		Unrealized Gains (Losses) from Debt Securities		Unrealized Gains (Losses) from Hedging Activities		Foreign Currency Translation Adjustment		Total Accumulated Other Comprehensive Income (Loss)
Balances, December 31, 2019	$	(9.2)	$	(0.1)	$	(40.1)	$	(17.4)	$	(66.8)
Other comprehensive income (loss) before reclassifications	—		(0.2)		(21.3)		(8.0)		(29.5)
Amounts reclassified from other comprehensive income	—		—		(5.2)		—		(5.2)
Net other comprehensive income (loss)	—		(0.2)		(26.5)		(8.0)		(34.7)
Balances, March 31, 2020	$	(9.2)	$	(0.3)	$	(66.6)	$	(25.4)	$	(101.5)

26

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

The table below provides details regarding significant reclassifications from AOCI during the three months ended March 31, 2021 and 2020:

Details about Accumulated Other Comprehensive Income Components	Amount Reclassified From Accumulated Other Comprehensive Income during the three months ended March 31,				Affected Line Item in the Condensed Consolidated Statements of Operations
	2021		2020
Unrealized Gains (Losses) on Hedging Activity
Foreign exchange forward contracts	$	(11.8)	$	11.4	Net product sales
Interest rate contracts	(11.4)		(4.6)		Interest expense
	(23.2)		6.8
	5.3		(1.6)		Income tax expense
	$	(17.9)	$	5.2

14.Fair Value Measurement

Authoritative guidance establishes a valuation hierarchy for disclosure of the inputs to the valuation used to measure fair value. This hierarchy prioritizes the inputs into three broad levels as follows. Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 2 inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument. Level 3 inputs are unobservable inputs based on our own assumptions used to measure assets and liabilities at fair value.

The following tables present information about our assets and liabilities that are measured at fair value on a recurring basis as of March 31, 2021 and December 31, 2020, and indicate the fair value hierarchy of the valuation techniques we utilized to determine such fair value.

		Fair Value Measurement as of March 31, 2021
Balance Sheet Classification	Type of Instrument	Total		Level 1		Level 2		Level 3
Cash equivalents	Money market funds	$	1,258.8	$	—	$	1,258.8	$	—
Marketable securities	Mutual funds	$	39.7	$	39.7	$	—	$	—
Other assets	Equity securities	$	137.4	$	137.4	$	—	$	—
Prepaid expenses and other current assets	Foreign exchange forward contracts	$	41.5	$	—	$	41.5	$	—
Other assets	Foreign exchange forward contracts	$	0.1	$	—	$	0.1	$	—
Other current liabilities	Foreign exchange forward contracts	$	21.6	$	—	$	21.6	$	—
Other current liabilities	Interest rate contracts	$	45.7	$	—	$	45.7	$	—
Other liabilities	Interest rate contracts	$	32.9	$	—	$	32.9	$	—
Current portion of contingent consideration	Acquisition-related contingent consideration	$	120.0	$	—	$	—	$	120.0
Contingent consideration	Acquisition-related contingent consideration	$	303.5	$	—	$	—	$	303.5

27

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

		Fair Value Measurement as of December 31, 2020
Balance Sheet Classification	Type of Instrument	Total		Level 1		Level 2		Level 3
Cash equivalents	Money market funds	$	833.7	$	—	$	833.7	$	—
Marketable securities	Mutual funds	$	34.9	$	34.9	$	—	$	—
Other assets	Equity securities	$	143.2	$	122.7	$	20.5	$	—
Prepaid expenses and other current assets	Foreign exchange forward contracts	$	26.1	$	—	$	26.1	$	—
Other current liabilities	Foreign exchange forward contracts	$	80.1	$	—	$	80.1	$	—
Other liabilities	Foreign exchange forward contracts	$	1.2	$	—	$	1.2	$	—
Other current liabilities	Interest rate contracts	$	45.9	$	—	$	45.9	$	—
Other liabilities	Interest rate contracts	$	45.4	$	—	$	45.4	$	—
Current portion of contingent consideration	Acquisition-related contingent consideration	$	114.9	$	—	$	—	$	114.9
Contingent consideration	Acquisition-related contingent consideration	$	299.4	$	—	$	—	$	299.4

There were no securities transferred between Level 1, 2 and 3 during the three months ended March 31, 2021.

Valuation Techniques

We classify mutual fund investments and equity securities, which are valued based on quoted market prices in active markets with no valuation adjustment, as Level 1 assets within the fair value hierarchy.

Cash equivalents classified as Level 2 within the valuation hierarchy relate to money market funds. The fair value of our money market funds was determined through third-party pricing sources.

Other investments in equity securities of publicly traded companies which are subject to holding period restrictions are carried at fair value using an option pricing valuation model and classified as Level 2 equity securities within the fair value hierarchy. The most significant assumptions within the option pricing valuation model are the term of the restrictions and the stock price volatility, which is based upon the historical volatility of the applicable company or similar companies. We also use a constant maturity risk-free interest rate to match the remaining term of the restrictions on such investments.

Our derivative assets and liabilities include foreign exchange and interest rate derivatives that are measured at fair value using observable market inputs such as forward rates, interest rates, our own credit risk as well as an evaluation of our counterparties’ credit risks. Based on these inputs, the derivative assets and liabilities are classified within Level 2 of the valuation hierarchy.

Contingent consideration liabilities related to business acquisitions are classified as Level 3 within the valuation hierarchy and are valued based on various estimates, including probability of success, discount rates and amount of time until the conditions of the milestone payments are met.

As of March 31, 2021, there has not been any impact to the fair value of our derivative liabilities due to our own credit risk. Similarly, there has not been any significant adverse impact to our derivative assets based on our evaluation of our counterparties’ credit risks.

Acquisition-Related Contingent Consideration

In connection with our prior business combinations, we may be required to pay future consideration that is contingent upon the achievement of specified development, regulatory approvals or sales-based milestone events. We determine the fair value of these obligations using various estimates that are not observable in the market and represent a Level 3 measurement within the fair value hierarchy. As of March 31, 2021, the resulting probability-weighted cash flows were discounted using a cost of debt ranging from 2.5% to 3.0% for developmental and regulatory milestones and a weighted average cost of capital of 9.0% for sales-based milestones. As of December 31, 2020, the resulting probability-weighted cash flows were discounted using a cost of debt ranging from 2.8% to 3.3% for developmental and regulatory milestones and a weighted average cost of capital of 9.0% for sales-based milestones.

28

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

Each reporting period, we adjust the contingent consideration to fair value with changes in fair value recognized in operating income. Changes in fair values reflect new information about the probability and timing of meeting the conditions of the milestone payments. In the absence of new information, changes in fair value will only reflect the interest component of contingent consideration related to changes in discount rates and the passage of time.

As of March 31, 2021, estimated future contingent milestone payments related to our business combinations range from zero if no milestone events are achieved, to a maximum of $905.6 if all development, regulatory and sales-based milestones are reached. In the first quarter of 2021, a sales-based milestone associated with our acquisition of Enobia Pharma Corp. was achieved. In connection with such achievement, we will make a $120.0 milestone payment in the second quarter of 2021. No additional milestone payments associated with our prior business combinations are expected during the next 12 months. As of March 31, 2021, the fair value of acquisition-related contingent consideration was $423.5. The following table represents a roll-forward of our acquisition-related contingent consideration:

	Three Months Ended March 31, 2021
Balance as of December 31, 2020	$	414.3
Changes in fair value	9.2
Balance as of March 31, 2021	$	423.5

29

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

15.Revenue Recognition

Disaggregation of Revenue

The Company disaggregates revenue from contracts with customers into product and geographical regions as summarized below.

	Three months ended March 31,
	2021		2020
SOLIRIS
United States	$	553.9	$	556.2
Europe	251.3		263.5
Asia Pacific	102.4		87.1
Rest of World	120.0		116.1
Total	$	1,027.6	$	1,022.9
ULTOMIRIS
United States	$	206.9	$	131.5
Europe	63.8		33.8
Asia Pacific	73.3		57.1
Rest of World	2.9		0.4
Total	$	346.9	$	222.8
STRENSIQ
United States	$	155.2	$	128.1
Europe	18.9		24.0
Asia Pacific	17.0		13.6
Rest of World	6.4		6.5
Total	$	197.5	$	172.2
ANDEXXA
United States	$	25.3	$	—
Europe	3.6		—
Asia Pacific	—		—
Rest of World	—		—
Total	$	28.9	$	—
KANUMA
United States	$	17.1	$	16.4
Europe	10.8		7.5
Asia Pacific	1.2		0.9
Rest of World	5.7		1.9
Total	$	34.8	$	26.7
Total Net Product Sales	$	1,635.7	$	1,444.6

30

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

Contract Balances and Receivables

Contract liabilities primarily relate to consideration received and/or billed for goods that have not been delivered to the customer and for which the performance obligation has not yet been completed. These amounts are included within other current liabilities in the condensed consolidated balance sheets.

The following table provides information about receivables and contract liabilities from our contracts with customers.

	March 31, 2021		December 31, 2020
Receivables, which are included in "Trade accounts receivable, net"	$	1,473.0	$	1,409.3
Contract liabilities, which are included in "Other current liabilities"	$	23.8	$	3.0

16.Income Taxes

Tax Rate

The following table provides a comparative summary of our income tax expense and effective income tax rate for the three months ended March 31, 2021:

	Three months ended
	March 31,
	2021			2020
Income tax expense	$	113.4		$	106.0
Effective income tax rate	18.8		%	16.0		%

Income tax expense is attributable to the U.S. federal, state and foreign income taxes on our profitable operations. The increase in the effective tax rate for the three months ended March 31, 2021 as compared to the same period in the prior year is primarily attributable to the consolidation of Caelum during the first quarter 2021. Caelum's net loss included in our condensed consolidated statement of operations for the three months ended March 31, 2021 was $196.0, including acquired in-process research and development expense of $193.3, for which no tax benefit has been recognized. This resulted in an increase to the effective tax rate of 5.2% for the three months ended March 31, 2021.

In April 2020 we became aware of a European withholding tax regulation that could be interpreted to apply to certain of our previous intra-group transactions. We recorded an immaterial reserve related to this matter during the second quarter of 2020.

We have recorded tax on the undistributed earnings of our controlled foreign corporation (CFC) subsidiaries. To the extent CFC earnings may not be repatriated to the U.S. as a dividend distribution due to limitations imposed by law, we have not recorded the related potential withholding, foreign, local, and U.S. state income taxes.

We continue to maintain a valuation allowance when it is more likely than not that all or a portion of certain deferred tax assets will not be realized.

17.Commitments and Contingencies

Asset Acquisition and In-License Agreements

We have entered into asset purchase agreements, license agreements, and option arrangements in order to advance and obtain technologies and services related to our business. These agreements generally require us to pay an initial fee and certain agreements call for future payments upon the attainment of agreed upon development, regulatory and/or commercial milestones. These agreements may also require minimum royalty payments based on sales of products developed from the applicable technologies, if any. Refer to Note 10, Caelum Biosciences, for information on commitments and additional payments that may be required in connection with our agreement with Caelum, which has been consolidated as a variable interest entity in our condensed consolidated balance sheets.

In March 2019, we entered into an agreement with Zealand which provides us with exclusive worldwide licenses, as well as development and commercial rights, for subcutaneously delivered preclinical peptide therapies

31

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

directed at up to four complement pathway targets. Pursuant to the agreement, Zealand will lead joint discovery and research efforts through the preclinical stage, and Alexion will lead development efforts beginning with the investigational new drug filing and Phase I studies. In addition to the agreement, we made an equity investment in Zealand (refer to Note 11, Other Investments). Under the terms of the agreement, we made an upfront payment of $40.0 for an exclusive license to the lead target and the equity investment, as well as for preclinical research services to be performed by Zealand in relation to the lead target. The market value of the equity investment was $13.8 as of the date of acquisition, which we recorded in other assets in our condensed consolidated balance sheets. We also recognized prepaid research and development expense of $5.0 within the condensed consolidated balance sheets associated with the research activities to be performed by Zealand. Due to the early stage of the asset we are licensing, we recorded the upfront license payment of $21.2 as research and development expense during the first quarter 2019. As of March 31, 2021, we could be required to pay up to $610.0, for the lead target, upon the achievement of specified development, regulatory and commercial milestones, as well as royalties on commercial sales. In addition, we could be required to pay up to an additional $115.0 in development and regulatory milestones if both a long-acting and short-acting product are developed with respect to the lead target. Each of the three subsequent targets can be selected for an option fee of $15.0 and has the potential for additional development, regulatory and commercial milestones, as well as royalty payments, at a reduced price to the lead target.

In September 2019, we entered into an agreement with Eidos through which Alexion obtained an exclusive license to develop and commercialize AG10 in Japan. AG10 is a small molecule designed to treat the root cause of transthyretin amyloidosis (ATTR) and is currently in a Phase III study in the U.S., Europe and Japan for ATTR cardiomyopathy (ATTR-CM). In addition, we made an equity investment in Eidos (refer to Note 11, Other Investments). Under the terms of the agreement, we made an upfront payment of $50.0 for the exclusive license to AG10 in Japan and the equity investment. The market value of the equity investment was $19.9 as of the date of acquisition, which we recorded in other assets in our condensed consolidated balance sheets. Due to the early stage of the asset we are licensing, we recorded the upfront license payment of $30.1 as research and development expense during the third quarter 2019. In January 2021, BridgeBio completed its acquisition of all the outstanding shares of Eidos common stock that BridgeBio did not already own. As of March 31, 2021, we could be required to pay $30.0 upon achievement of a Japanese-based regulatory milestone as well as royalties on commercial sales.

In October 2018, we entered into a collaboration agreement with Dicerna that provides us with exclusive worldwide licenses and development and commercial rights for two preclinical RNA interference (RNAi) subcutaneously delivered molecules for complement-mediated diseases, as well as an exclusive option for other preclinical RNAi molecules for two additional targets within the complement pathway. In addition to the collaboration agreement, we made an equity investment in Dicerna. Under the terms of the agreements, we made an upfront payment of $37.0 for the exclusive licenses and the equity investment. The market value of the equity investment was $10.3 as of the date of acquisition, which we recorded in other assets in our condensed consolidated balance sheets. Due to the early stage of the assets we are licensing, we recorded the upfront license payment of $26.7 as research and development expense during the fourth quarter 2018. In December 2019, we exercised our option for exclusive rights to two additional targets within the complement pathway under an existing agreement with Dicerna, which expands our existing research collaboration and license agreement with Dicerna to include a total of four targets within the complement pathway. In connection with the option exercise, we paid Dicerna $20.0, which we recorded as research and development expense in the fourth quarter 2019. As of March 31, 2021, we could be required to pay up to $604.1 for amounts due upon the achievement of specified research, development, regulatory and commercial milestones on the four licensed targets, as well as royalties on commercial sales.

In December 2017, we entered into a collaboration and license agreement with Halozyme Therapeutics, Inc. that allows us to use drug-delivery technology in the development of subcutaneous formulations for our portfolio of products for up to four targets. Under the terms of the agreement, we made an upfront payment of $40.0 for an exclusive license to two of the four potential targets and due to the early stage of the assets we are licensing, we recorded an expense for the upfront payment during the fourth quarter 2017. During the second quarter 2020, we forfeited our rights to one of the two targets we initially licensed. As of March 31, 2021, we could be required to pay up to $155.0 for the remaining licensed target upon achievement of specified development, regulatory and sales-based milestones, as well as royalties on commercial sales. Each of the two subsequent targets can be licensed for an option fee of $8.0, with contingent payments of up to $160.0 per target, subject to development, regulatory and commercial milestones, as well as royalties on commercial sales.

32

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

In connection with our prior acquisition of Syntimmune, Inc., a clinical-stage biotechnology company developing an antibody therapy targeting the FcRn, we could be required to pay up to $800.0 upon the achievement of specified development, regulatory and commercial milestones, of which $130.0 is specific to the subcutaneous formulation. We are currently subject to a claim in litigation in connection with the Syntimmune acquisition alleging that Alexion failed to meet its obligations under the merger agreement to use commercially reasonable efforts to achieve the milestones and plaintiff has requested payment of the full earn-out amount.

In addition, as of March 31, 2021, we have other license agreements under which we may be required to pay up to an additional $114.1 for currently licensed targets, if certain development, regulatory and commercial milestones are met, including up to $71.5 for the development of cerdulatinib in multiple indications pursuant to an in-licensing agreement with Astellas Pharma, Inc. which was assumed through the acquisition of Portola in the third quarter 2020. Additional amounts may be payable if we elect to acquire licenses to additional targets, as applicable, under the terms of these agreements.

During the next 12 months, we may incur milestone payments related to our asset acquisitions, option and in-license agreements of approximately $155.1 as of March 31, 2021, inclusive of $14.0 of potential milestone payments due to Caelum, which has been consolidated as a variable interest entity as of the first quarter 2021. Additionally, in the event we exercise the exclusive purchase option with Caelum, the agreement provides for additional payments to Caelum for up to $500.0, which includes an upfront option exercise payment of $150.0 and potential regulatory and commercial milestone payments of up to $350.0. The pending acquisition of Alexion by AstraZeneca will accelerate the expiration period of the exclusive purchase option to 6-months after the close of the acquisition.

Asset Sale and Out-License Arrangements

In connection with prior asset sale and out-license arrangements, including those assumed by Alexion through prior acquisitions, Alexion is entitled to receive contingent payments upon the achievement of various regulatory and commercial milestones and other events, as well as royalties on commercial sales. Income resulting from contingent milestone payments and royalties on commercial sales is generally recognized when the contingent consideration is probable and no longer constrained. Additionally, sales-based milestones and royalties on commercial sales resulting from an out-license arrangement are subject to the sales-and-usage based royalty scope exception and recognized only when the associated sales occur.

In September 2018, we sold all assets, rights and obligations of the ALXN1101 program to Origin Biosciences, Inc. (Origin) and, as a result, recognized a gain of $3.5 during the third quarter 2018. Under the terms of the agreement with Origin, Alexion is entitled to receive contingent payments upon the achievement of various regulatory and commercial milestones, including Origin’s receipt of a PRV, as well as royalties on commercial sales. In the first quarter of 2021, ALXN1101, now branded as NULIBRY™ (fosdenopterin), received approval from the FDA. Origin also received a PRV in connection with this approval. As a result, we recognized income of $20.0 in gain on sale of assets in the condensed consolidated statements of operations for the three months ended March 31, 2021. This income primarily represents the change in our estimate of variable consideration expected to be received under this contract. Additional rights to receive contingent payments of approximately $21.0 upon certain contingent milestone events, as well as royalties on sales of NULIBRY™, remain fully constrained given the significant uncertainty in realizing any such amounts.

The amount of contingent consideration related to our other asset sale and out-license agreements is fully constrained and therefore has not been recognized as of March 31, 2021.

Manufacturing Agreements

We have various manufacturing development and license agreements to support our clinical and commercial product needs.

We rely on Lonza, a third party manufacturer, to produce a portion of commercial and clinical quantities of our commercial products and product candidates. We have various manufacturing and license agreements with Lonza, with remaining total non-cancellable future commitments of approximately $1,432.1 through 2030. This amount includes $97.9 of undiscounted, fixed payments applicable to our Contract Manufacturing Organization (CMO) embedded lease arrangement with Lonza. If we terminate certain supply agreements with Lonza without cause, we will be required to pay for product scheduled for manufacture under our arrangement. Under an existing arrangement with Lonza, we pay Lonza a royalty on the sales of SOLIRIS and ULTOMIRIS manufactured at Lonza facilities.

33

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

In addition to our commitments with Lonza, as of March 31, 2021 we have non-cancellable commitments of approximately $125.7 through 2023 with other third party manufacturers.

Contingent Liabilities

We are currently involved in various claims, disputes, lawsuits, investigations, administrative proceedings and legal proceedings. On a quarterly basis, we review the status of each significant matter and assess its potential financial exposure. In accordance with generally accepted accounting principles, if the potential loss from any claim, asserted or unasserted, or legal proceeding is considered probable and the amount can be reasonably estimated, we accrue a liability for the estimated loss. Because of uncertainties related to claims, proceedings and litigation, accruals are based on our best estimates based on information available at the time of the assessment. On a periodic basis, as additional information becomes available, or based on specific events such as the outcome of litigation, court decisions or settlement of claims (and offers of settlement), we may reassess the potential liability related to these matters and may revise these estimates, which could result in a material adverse adjustment to our operating results. Costs associated with our involvement in legal proceedings are expensed as incurred. The outcome of any such proceedings, regardless of the merits, is inherently uncertain. If we were unable to prevail in any such proceedings, our consolidated financial position, results of operations, and future cash flows may be materially impacted.

We have received, and may in the future receive, notices from third parties claiming that their patents may be infringed by the use, development, manufacture, importation or sale of our products or product candidates. Under the guidance of ASC 450, Contingencies, we record a royalty accrual based on our best estimate of the fair value percent of net sales of our products that we could be required to pay the owners of patents for technology used in the manufacture and sale of our products. A costly license, or inability to obtain a necessary license, could have a material adverse effect on our financial results.

In May 2015, we received a subpoena in connection with an investigation by the Enforcement Division of the Securities and Exchange Commission (SEC) requesting information related to our grant-making activities and compliance with the Foreign Corrupt Practices Act (FCPA) in various countries. In addition, in October 2015, we received a request from the Department of Justice (DOJ) for the voluntary production of documents and other information pertaining to Alexion’s compliance with the FCPA. The SEC and DOJ also sought information related to Alexion’s recalls of specific lots of SOLIRIS and related securities disclosures.

The investigations focused on operations in various countries, including Brazil, Colombia, Japan, Russia and Turkey, and Alexion's compliance with the FCPA and other applicable laws.

In May 2020, DOJ informed us that it has closed its inquiry into these matters.

On July 2, 2020, we reached a civil settlement with the SEC fully resolving the SEC’s investigation into possible violations of the FCPA. Alexion neither admitted nor denied any wrongdoing in connection with the settlement but agreed to pay $21.5 to the SEC, consisting of amounts attributable to disgorgement, civil penalties, and pre-judgment interest. In connection with this settlement, in July 2020, we paid $21.5 to the SEC.

Following the settlement with the SEC, the Ministry of Health in Turkey initiated an investigation regarding the matters referenced in the SEC Order as they relate to the Company’s operations in Turkey between 2010 and 2015. We are cooperating with this investigation.

Alexion is committed to continually focusing on its compliance program and continues to enhance its comprehensive company-wide program that is designed to enhance our business processes, structures, controls, training, talent, and systems across Alexion’s global operations.

As previously reported, on December 29, 2016, a shareholder filed a putative class action against the Company and certain former employees in the U.S. District Court for the District of Connecticut, alleging that defendants made misrepresentations and omissions about SOLIRIS. On April 12, 2017, the court appointed a lead plaintiff. On July 14, 2017, the lead plaintiff filed an amended putative class action complaint against the Company and seven current or former employees. Defendants moved to dismiss the amended complaint on September 12, 2017. Plaintiffs filed an opposition to defendants’ motion to dismiss on November 13, 2017, and defendants filed a reply brief in further support of their motion on December 28, 2017. On March 26, 2019, the court held a telephonic status conference. During that conference, the court informed counsel that it was preparing a ruling granting the defendants’ pending motion to dismiss. The court inquired of plaintiffs’ counsel whether they intended to seek leave to amend their complaint, and indicated that if they wished to file a second amended complaint, they would be allowed to do so. On April 2, 2019, the court granted plaintiffs until May 31, 2019 to file a second amended

34

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

complaint, thereby rendering moot defendants’ pending motion to dismiss. On June 2, 2019, plaintiffs filed a second amended complaint against the same defendants. The complaint alleges that defendants engaged in securities fraud, including by making misrepresentations and omissions in its public disclosures concerning the Company’s SOLIRIS sales practices, management changes, and related investigations, between January 30, 2014 and May 26, 2017, and that the Company's stock price dropped upon the purported disclosure of the alleged fraud. The plaintiffs seek to recover unspecified monetary relief, unspecified equitable and injunctive relief, interest, and attorneys’ fees and costs. Defendants’ filed a motion to dismiss the amended complaint on August 2, 2019; plaintiffs’ filed their opposition to that motion on October 2, 2019; and defendants’ filed their reply in further support of their motion on November 15, 2019. Given the early stage of these proceedings, we cannot presently predict the likelihood of obtaining dismissal of the case (or the ultimate outcome of the case if the motion to dismiss is denied by the court), nor can we estimate the possible loss or range of loss at this time.

In December 2016, we received a subpoena from the U.S. Attorney's Office for the District of Massachusetts requesting documents relating generally to our support of Patient Services, Inc. (PSI) and National Organization for Rare Disorders (NORD), 501(c)(3) organizations that provide financial assistance to Medicare patients taking drugs sold by Alexion; Alexion’s provision of free drug to Medicare patients; and Alexion compliance policies and training materials concerning the anti-kickback statute and information on donations to PSI and NORD from 2010 through 2016. In April 2019, we entered into a civil settlement agreement with the DOJ and the Office of Inspector General (OIG) of the U.S. Department of Health and Human Services to resolve this matter. As part of the settlement agreement, Alexion paid $13.1 to the DOJ and OIG. OIG did not require a Corporate Integrity Agreement with Alexion because it made fundamental organizational changes, including hiring a new executive leadership team, replacing half of the members of its Board of Directors, and effecting a significant change in the workforce.

In May 2017, Brazilian authorities seized records and data from our São Paulo, Brazil offices as part of an investigation being conducted into Alexion’s Brazilian operations. We are cooperating with this inquiry.

In June 2017, we received a demand to inspect certain of our books and records pursuant to Section 220 of the General Corporation Law of the State of Delaware on behalf of a purported stockholder. Among other things, the demand sought to determine whether to institute a derivative lawsuit against certain of the Company’s directors and officers in relation to the investigation by our Audit and Finance Committee announced in November 2016 and the investigations instituted by the SEC, DOJ, U.S. Attorney’s Office for the District of Massachusetts, and Brazilian law enforcement officials that are described above. We have responded to the demand. Given the early stages of this matter, an estimate of the possible loss or range of loss cannot be made at this time.

On September 27, 2017, a hearing panel of the Canadian Patented Medicine Prices Review Board (PMPRB) issued a decision in a previously pending administrative pricing matter that we had excessively priced SOLIRIS in a manner inconsistent with the Canadian pricing rules and guidelines. In its decision, the PMPRB ordered Alexion to decrease the price of SOLIRIS to an upper limit based upon pricing in certain other countries, and to forfeit excess revenues for the period between 2009 and 2017. The amount of excess revenues for the period between 2009 and 2017 was determined not to be a material amount and was paid in 2018. In October 2017, Alexion filed an application for judicial review of the PMPRB’s decision in the Federal Court of Canada. On May 23, 2019, the Federal Court of Canada dismissed Alexion's application for judicial review and, as a consequence, affirmed the decision of the PMPRB that we had excessively priced SOLIRIS. On June 21, 2019, Alexion filed a notice of appeal of the Federal Court of Canada's ruling, and, on October 17, 2019, Alexion filed a memorandum of fact and law in support of the appeal. On December 3, 2019, the Attorney General of Canada filed its memorandum of fact and law in support of the Federal Court of Canada's dismissal of Alexion's appeal of the PMPRB's decision. On December 19, 2019, the intervenor, the Minister of Health for the Province of British Columbia, filed a separate memorandum of fact and law in support of the Federal Court of Canada's decision. The Canadian Federal Court of Appeal heard the appeal on October 21 and 22, 2020, but has not issued a decision as of the date of this filing. Pursuant to an order made by the Federal Court of Canada, as of April 28, 2021, we have placed approximately $80.9 in escrow to secure our obligations pending the final resolution of all appeals in this matter. This amount reflects the difference between the list price for SOLIRIS and the price determined by the PMPRB to be non-excessive for sales of SOLIRIS in Canada for the period beginning September 2017 through March 31, 2021. In addition, on a quarterly basis, until the appeals process has concluded, Alexion will be required to place amounts into escrow for each vial of SOLIRIS sold in the applicable quarter equal to the difference between the list price for SOLIRIS and the price determined by the PMPRB to be non-excessive. Our revenues in Canada have been reduced by $54.7 cumulatively to date, which is our current best estimate of our liability through March 31, 2021 if we lose the appeal of this matter (the amount of our ultimate liability, however, may be greater than this estimate when the appeal process for this matter is concluded).

35

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

Chugai Pharmaceutical Co., Ltd. has filed three lawsuits against Alexion. The first was filed in November 2018 in the United States District Court for the District of Delaware against Alexion Pharmaceuticals, Inc. alleging that ULTOMIRIS infringes one U.S. patent held by Chugai Pharmaceutical Co., Ltd. Upon issuance of a new U.S. patent on November 12, 2019, Chugai filed a second lawsuit in the United States alleging that ULTOMIRIS infringes the new patent. The parties have agreed to consolidate the November 2018 and November 2019 lawsuits. Chugai filed a third lawsuit in December 2018 in the Tokyo District Court against Alexion Pharma GK (a wholly-owned subsidiary of Alexion) in Japan, and alleges that ULTOMIRIS infringes two Japanese patents held by Chugai Pharmaceutical Co., Ltd.  Chugai’s complaints seek unspecified damages and certain injunctive relief. On March 5, 2020, the Supreme Court of Japan dismissed Chugai's appeal against an earlier IP High Court of Japan decision which held that one of the Chugai patents-in-suit is invalid. Subsequently Chugai filed a correction to the claims of this patents-in-suit and Alexion has countered that the corrected claims are still invalid and not infringed. In all cases, Alexion has denied the charges and countered that the patents are neither valid nor infringed. A trial date for the U.S. case which was initially set for July 2021 has been re-scheduled for January 2022. The case is still at the briefing stage in Japan. Given the early stages of these litigations, an estimate of the possible loss or range of loss cannot be made at this time.

In connection with an ongoing matter, in August 2019, the Brazilian Federal Revenue Service provided a Notice of Tax and Description of the Facts (the “Tax Assessment”) to two Alexion subsidiaries (the "Brazil Subsidiaries"), as well as to two additional entities, a logistics provider utilized by Alexion and a distributor. The Tax Assessment focuses on the importation of SOLIRIS vials pursuant to Alexion’s free drug supply to patients program (referred to as Global Access to Medicines, or GATM) in Brazil. In September 2019, the Brazil Subsidiaries filed defenses to the Tax Assessment disputing the basis for liability under the Tax Assessment, based on, among others, the following: in connection with the operation of GATM, during the period from September 2014 to June 2019: (i) the importers responsible for the importation of the GATM SOLIRIS vials into Brazil were correctly identified and (ii) the correct customs value was utilized for the purpose of importing the GATM SOLIRIS vials provided to the patients free of charge. Alexion prevailed in the first level of administrative appeals in the Brazilian federal administrative proceeding system based on a deficiency in the Brazil Tax Assessment. The decision was subject to an automatic (ex officio) appeal to the second level of the administrative courts. On March 30, 2021, counter-arguments against the ex officio appeal were filed on behalf of the Brazil Subsidiaries. There are three separate levels of administrative appeals within the Brazilian federal administrative proceeding system and, if the outcome of these administrative appeals is unfavorable, the final decision of the federal administrative proceeding system can be disputed to the federal court systems in Brazil (at this time, Alexion intends to appeal the Tax Assessment if it is not overturned in the course of administrative appeals). Given the early stage of these proceedings, Alexion is unable to predict the duration, scope or outcome of this matter, but we expect that a final resolution will take three years or more. While it is possible that a loss related to the Tax Assessment may be incurred, given its ongoing nature, we cannot reasonably estimate the potential magnitude of any such possible loss or range of loss, or the cost of the ongoing administrative appeals (and potential appeals to the federal court system) of the Tax Assessment. Any determination that any aspects of the importation of free of charge medications into Brazil as set forth in the Tax Assessment are not, or were not, in compliance with existing laws or regulations could result in the imposition of fines, civil penalties and, potentially criminal penalties, and/or other sanctions against us, and could have an adverse impact on our Brazilian operations.

In connection with Alexion’s acquisition of Portola, we have assumed litigation to which Portola was a party. Among the litigation assumed is a securities fraud class action filed against Portola and certain of its officers, directors and underwriters (“Defendants”) under the Securities Act of 1933 and the Securities Exchange Act of 1934. Specifically, on January 16, 2020, February 7, 2020, and February 28, 2020, stockholders filed three putative class actions in the U.S. District Court for the Northern District of California, captioned Hayden v. Portola Pharmaceuticals, Inc., et al., No. 3:20-cv-00367-VC (N.D. Cal.); McCutcheon v. Portola Pharmaceuticals, Inc., et al., No. 3:20-cv-00949 (N.D. Cal.); and Southeastern Pennsylvania Transportation Authority v. Portola Pharmaceuticals, Inc., et al., No. 3:20-cv-01501 (N.D. Cal.). These cases have since been consolidated, and on April 22, 2020, the Court issued an Order appointing the Alameda County Employees’ Retirement Association (“ACERA”) as Lead Plaintiff in the litigation. ACERA filed its amended consolidated complaint on May 20, 2020, asserting that Defendants made misrepresentations and omissions in public disclosures (including in materials issued in connection with the August 7, 2019 securities offering) concerning Portola’s sales of andexanet alfa, marketed as ANDEXXA in the United States and ONDEXXYA in Europe, between January 8, 2019 and February 26, 2020. Specifically, plaintiffs allege that Defendants made materially false and/or misleading statements about the demand for ANDEXXA, usage of ANDEXXA by hospitals and healthcare organizations, and about Portola’s accounting for its return reserves. Plaintiffs contend that the alleged fraud was revealed on January 9, 2020, when Portola announced its preliminary unaudited financial

36

Alexion Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(unaudited)

(amounts in millions, except per share amounts)

results for the fourth quarter of 2019, and again on February 26, 2020, when Portola issued its fourth quarter 2019 financial results. In July 2020, Portola and the Portola Defendants filed a motion to dismiss with the Court. The court heard oral argument on September 24, 2020 and granted defendants’ pending motion to dismiss, but with leave for plaintiffs to amend further their complaint. Plaintiffs filed an amended complaint on November 5, 2020. In December 2020, Portola and Portola Defendants filed a motion to dismiss with the Court. A hearing occurred on March 4, 2021, and the Court dismissed the case with leave to amend on March 10, 2021. The Plaintiffs filed a second amended complaint on March 31, 2021. Portola and the Portola Defendants must file a motion to dismiss by May 5, 2021, with the opposition scheduled to be filed by June 9,2021, and the reply scheduled to be filed by June 30, 2021. A hearing is scheduled for July 22, 2021. Plaintiffs seek to recover unspecified monetary relief, interest, and attorneys’ fees and costs. Given the early stage of these proceedings, we cannot presently predict the likelihood of obtaining dismissal of the case (or the ultimate outcome of the case if that motion to dismiss is denied by the court), nor can we estimate the possible loss or range of loss at this time.

In connection with the transactions contemplated by the Merger Agreement with AstraZeneca, nine complaints have been filed by purported Alexion stockholders against Alexion and its current or former directors, and, in certain cases, AstraZeneca and the Merger Subs. The complaints are captioned Votto v. Alexion Pharmaceuticals, Inc., et al., No. 1:21-cv-02067 (S.D.N.Y); Wang v. Alexion Pharmaceuticals, Inc., et al., No. 1:21-cv-02095 (S.D.N.Y.); Wei v. Alexion Pharmaceuticals, Inc., et al., No. 1:21-cv-02100 (S.D.N.Y.); Naquin v. Alexion Pharmaceuticals, Inc., et al., No. 1:21-cv-02119 (S.D.N.Y.); Raul v. Alexion Pharmaceuticals, Inc., et al., No. 1:21-cv-02238 (S.D.N.Y.); Parshall v. Alexion Pharmaceuticals, Inc., et al., No. 1:21-cv-02670 (S.D.N.Y.); Davis v. Alexion Pharmaceuticals, Inc., et al., No. 1:21-cv-01429 (E.D.N.Y.); Kent v. Alexion Pharmaceuticals, Inc., et al., No. 1:21-cv-00441 (D. Del.); McKenzie v. Alexion Pharmaceuticals, Inc., et al., No. 2:21-cv-01515 (E.D. Pa.). The complaints generally allege that the preliminary registration statement filed with the SEC on February 19, 2021, omitted certain allegedly material information in connection with the transaction, and one of the complaints further alleges that the Alexion directors breached their fiduciary duties in connection with the transaction and that AstraZeneca and the other entity defendants aided and abetted the alleged breaches. The lawsuits seek various remedies, including enjoining the consummation of the transaction unless certain allegedly material information is disclosed, directing dissemination of additional allegedly material disclosures, rescission of the transaction, or rescissory damages in the event the transaction is consummated without such disclosures, and an accounting to the plaintiffs for any damages allegedly suffered. Given the early stage of the proceedings, an estimate of the possible loss or range of loss cannot be made at this time.

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Item 2.MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS.

Note Regarding Forward-Looking Statements

This quarterly report on Form 10-Q contains forward-looking statements. Words such as “anticipates,” "may," "forecasts," “expects,” “intends,” “plans,” "potentially," “believes,” “seeks,” “estimates,” variations of such words and similar expressions are intended to identify such forward-looking statements, although not all forward-looking statements contain these identifying words. Forward-looking statements are not guarantees of future performance and are subject to certain risks, uncertainties, and assumptions that are difficult to predict; therefore, actual results may differ materially from those expressed or forecasted in any such statements. Such forward-looking statements are based on current expectations, estimates and projections about our industry and business, management's beliefs, and certain assumptions made by our management, and may include, but are not limited to, statements regarding:

•the proposed transaction with AstraZeneca PLC;

•the potential benefits and commercial potential of ULTOMIRIS®, SOLIRIS®, STRENSIQ®, KANUMA® and ANDEXXA® for approved indications and any expanded uses;

•sales of our products in various markets worldwide, pricing for our products, level of insurance coverage and reimbursement for our products, timing regarding development and regulatory approvals for our products or for additional indications or in additional territories;

•plans for clinical trials (and proof of concept trials and exploratory clinical studies), status of our ongoing clinical trials for our product candidates, commencement dates for new clinical trials, timing and results of clinical trials and evaluation of our clinical trial results by regulatory agencies;

•potential benefits offered by product candidates, including improved dosing intervals and potential to improve treatment in disease areas;

•the medical and commercial potential of additional indications for our products;

•the expected timing for the completion and/or regulatory approval of our facilities and facilities of our third-party manufacturers;

•future expansion of our commercial organization and transition to third parties in certain jurisdictions to perform sales, marketing and distribution functions;

•future governmental and regulatory decisions that directly or indirectly impact drug pricing (and discounts) and the adoption, implementation and interpretation of healthcare laws and regulations (and the impact on our business);

•plans, prospects and expected timing for future regulatory filings and regulatory approval of products and product candidates;

•competitors, potential competitors and future competitive products (including biosimilars);

•plans to grow our product pipeline (and diversify our business, including through acquisitions) and anticipated benefits to the Company;

•future objective to expand business and sales;

•future plans to retain earnings and not pay dividends;

•expected decisions to appeal certain legal proceedings and intellectual property decisions;

•expectations to realize the carrying value of product inventory and the ability to sell certain inventory;

•impact of accounting standards;

•future costs (including cost of goods sold), operating expenses (including research and development, sales, general and administrative and restructuring expenses) and capital requirements, capital investment, sufficiency of cash to fund operations for at least the next 12 months, ability to make payment on our credit facility and make contingent payment obligations, the sufficiency of our existing capital resources and projected cash needs, price approval and funding processes in various countries;

•the sources of expected increases in cash flow from operations, if any;

•anticipated impact of interest rate changes on financial statements;

•anticipated future milestone, contingent and royalty payments and lease payments (and, in each case, expected impact on liquidity);

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•anticipated impact of the COVID-19 pandemic on our business;                                

•timing and anticipated amounts of future tax payments and benefits (including the potential recognition of unrecognized tax benefits), as well as timing of conclusion of tax audits;

•collection of accounts receivable and impact of any delay in the future in collecting accounts receivable on financial condition and operations, as well as the ability of counterparties to our derivatives to perform their obligations;

•the safety and efficacy of our products and our product candidates;

•the adequacy of our pharmacovigilance and drug safety reporting processes;

•the uncertainties involved in the drug development process and manufacturing;

•performance and reliance on third party service providers;

•our future research and development activities, plans for acquired programs, our ability to develop and commercialize products with our collaborators, anticipated regulatory approval of acquisitions and anticipated closing of acquisitions;

•periods of patent, regulatory and market exclusivity for our products;

•the scope of our intellectual property, future patent filings, and the outcome of any challenges or opposition to our intellectual property; and

•estimates of our inventory capacity and the capacity of manufacturing and other service facilities to support our business operations, products and product candidates.

Such risks and uncertainties include, but are not limited to, the possibility that our sale to AstraZeneca does not close on the anticipated timeline or at all; the impact of the COVID-19 pandemic on our business (including our financial results and clinical trials), increased competition, actions by regulatory agencies, product candidates not receiving regulatory approvals, the possibility that expected tax benefits will not be realized, changes in healthcare and tax laws and regulations, implementation of the Most Favored Nation pricing proposal in the U.S., assessment of impact of recent accounting pronouncements, potential declines in sovereign credit ratings or sovereign defaults in countries where we sell our products, delay of collection or reduction in reimbursement due to adverse economic conditions or changes in government and private insurer regulations and approaches to reimbursement, uncertainties surrounding legal proceedings, company investigations and government investigations and assessments, pending securities class action litigations, the investigation of our Brazilian operations by Brazilian authorities, the tax assessment by the Brazilian Federal Revenue Service and potential future tax assessments or liabilities by other revenue or tax regulators, risks related to the short and long-term effects of other government healthcare measures, intellectual property lawsuits, and the effect of shifting foreign exchange rates, as well as those risks and uncertainties discussed later in this report under the section entitled “Risk Factors.” Unless required by law, we undertake no obligation to update publicly any forward-looking statements, whether because of new information, future events or otherwise. However, readers should carefully review the risk factors set forth in this and other reports or documents we file from time to time with the SEC.

Overview

Alexion is a global biopharmaceutical company focused on serving patients and families affected by rare diseases and devastating conditions through the discovery, development and commercialization of life-changing medicines.

As a leader in rare diseases for more than 25 years, Alexion has developed and commercializes two approved complement inhibitors to treat patients with paroxysmal nocturnal hemoglobinuria (PNH) and atypical hemolytic uremic syndrome (aHUS), as well as the first and only approved complement inhibitor to treat anti-acetylcholine receptor (AChR) antibody-positive generalized myasthenia gravis (gMG) and neuromyelitis optica spectrum disorder (NMOSD) in patients who are anti-aquaporin-4 (AQP4) antibody positive. Alexion also has two highly innovative enzyme replacement therapies and the first and only approved therapies for patients with life-threatening and ultra-rare metabolic disorders, hypophosphatasia (HPP) and lysosomal acid lipase deficiency (LAL-D) as well as the first and only approved Factor Xa inhibitor reversal agent for patients treated with rivaroxaban or apixaban when reversal of anticoagulation is needed due to life-threatening or uncontrolled bleeding.

In addition to our marketed therapies, we have a diverse pipeline resulting from internal innovation and business development. Alexion focuses its research efforts on novel molecules and targets in the complement cascade and development efforts on the core therapeutic areas of hematology, nephrology, neurology, metabolic disorders, cardiology, ophthalmology and acute care.

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Merger Agreement with AstraZeneca

On December 12, 2020, we entered into an Agreement and Plan of Merger (the Merger Agreement) with AstraZeneca PLC, a public limited company incorporated under the laws of England and Wales (AstraZeneca), Delta Omega Sub Holdings Inc., a Delaware corporation and a wholly owned subsidiary of AstraZeneca (Bidco), Delta Omega Sub Holdings Inc. 1, a Delaware corporation and a direct, wholly owned subsidiary of Bidco (Merger Sub I) and Delta Omega Sub Holdings LLC 2, a Delaware limited liability company and a direct, wholly owned subsidiary of Bidco (Merger Sub II). The Merger Agreement provides, among other things, that subject to the satisfaction or waiver of the conditions set forth therein (1) Merger Sub I will merge with and into Alexion (the “First Merger”), with Alexion surviving the First Merger as a wholly owned subsidiary of Bidco, and (2) immediately following the effective time of the First Merger (the Effective Time), Alexion will merge with and into Merger Sub II (the Second Merger and, together with the First Merger, the Mergers), with Merger Sub II surviving the Second Merger as a wholly owned subsidiary of Bidco and an indirect wholly owned subsidiary of AstraZeneca.

Under the Merger Agreement, at the Effective Time (as defined in the Merger Agreement), each share of common stock, par value $0.0001 per share, of Alexion issued and outstanding immediately prior to the Effective Time (other than certain excluded shares as described in the Merger Agreement) will be converted into the right to receive (1) 2.1243 American depositary shares of AstraZeneca (or, at the election of the holder thereof, a number of ordinary shares of AstraZeneca equal to the number of underlying ordinary shares represented by such American depositary shares) and (2) $60.00 in cash, without interest (collectively, the “Merger Consideration”).

The boards of directors of both companies have unanimously approved the acquisition.

The respective obligations of Alexion and AstraZeneca to consummate the transactions contemplated by the Merger Agreement are subject to the satisfaction or waiver of a number of customary conditions, including: (1) the adoption of the Merger Agreement by Alexion’s stockholders; (2) approval of the transactions contemplated by the Merger Agreement by AstraZeneca’s shareholders; (3) the absence of any law or order prohibiting consummation of the Mergers; (4) AstraZeneca’s registration statement on Form F-4 having been declared effective by the Securities and Exchange Commission; (5) AstraZeneca’s shareholder circular (or, if required, prospectus) having been approved by the U.K. Financial Conduct Authority; (6) the American depository shares of AstraZeneca issuable in the Mergers (and the ordinary shares of AstraZeneca represented thereby) having been approved for listing on the Nasdaq; (7) the expiration or early termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and the approval of the Mergers under the antitrust and foreign investment laws of other specified jurisdictions; (8) accuracy of the other party’s representations and warranties, subject to certain materiality standards set forth in the Merger Agreement and (9) compliance by the other party in all material respects with such other party’s obligations under the Merger Agreement.

Without limiting the generality of the foregoing, we are subject to a variety of specified restrictions under the Merger Agreement. Unless we obtain AstraZeneca’s prior written consent (which consent may not be unreasonably withheld, conditioned or delayed) and except (i) as required or expressly contemplated by the Merger Agreement, (ii) as required by applicable law or (iii) as set forth in the confidential disclosure schedule delivered by Alexion to AstraZeneca, we may not, among other things and subject to certain exceptions and aggregate limitations, incur additional indebtedness, issue additional shares of our common stock outside of our equity incentive plans, repurchase our common stock, pay dividends, acquire assets, securities or property, dispose of businesses or assets, enter into material contracts or make certain additional capital expenditures.

The transaction is not subject to a financing condition. To support the financing of the offer consideration, AstraZeneca has entered into a new committed $17,500.0 bridge-financing facility, provided by Morgan Stanley, J.P. Morgan Securities plc and Goldman Sachs.

Under the Merger Agreement, Alexion will be required to make a payment to AstraZeneca equal to $1,180.0 if the Merger Agreement is terminated in certain circumstances, including because the Alexion board of directors has changed its recommendation in favor of the Mergers or we terminated the Merger Agreement in order to enter into an agreement providing for a Company Superior Proposal (as defined in the Merger Agreement), and Alexion will be required to make a payment to AstraZeneca equal to $270.0 if the Merger Agreement is terminated because Alexion’s stockholders fail to adopt the Merger Agreement. AstraZeneca will be required to make a payment to Alexion equal to $1,415.0 if the Merger Agreement is terminated in certain circumstances, including because the AstraZeneca board of directors has changed its recommendation in favor of the Mergers or because AstraZeneca’s shareholders fail to approve the transactions contemplated by the Merger Agreement.

The acquisition is expected to close during the third quarter 2021.

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Recent Developments

COVID-19 Pandemic

The COVID-19 pandemic continues to present a substantial public health and economic challenge globally. While the impact of the COVID-19 pandemic to date on our business has been less than we had initially forecast, it is evolving rapidly and its future effects are difficult to predict with meaningful precision as the impact will depend on many factors beyond the Company’s control and knowledge. As the pandemic continues, we continue to take steps that are designed to respond proactively to evolving events and planning for COVID-19 uncertainties.

We are focused on protecting patient and customer safety as well as providing an uninterrupted supply of medicines for patients around the world. We have taken proactive measures that are designed to mitigate the risk of potential supply interruptions, and we strive to maintain sufficient inventory levels to continue serving current and new patients receiving our medicines for approved indications, as well as those participating in ongoing clinical trials. We and our third-party contract manufacturing partners continue to operate manufacturing facilities at near normal levels.

We are monitoring the demand for our products as due to quarantines, travel restrictions, hospital policies and patient concerns regarding exposure to COVID-19, we have observed fewer patient/doctor interactions, we have also noted that the new patient productivity and initiation queue has decreased since the COVID-19 outbreak (particularly in our neurological indications) and our representatives are having fewer in-person visits with health care providers, including for infusion of our products which has adversely impacted our revenue growth and may continue to affect our revenue growth in the future. We have been proactively engaging with healthcare professionals virtually and through enhanced digital channels in an effort to mitigate this risk. Additionally, we continue to actively monitor potential further impacts on our business such as growth in unemployment and loss of commercial insurance coverage and/or growth in Medicaid with higher discounts.

We have preclinical studies and clinical testing ongoing across the globe. We have a business continuity plan for our preclinical and clinical trials, including a pandemic response plan. A number of clinical trial sites are restricting site visits and imposing restrictions on the initiation of new trials and patient visits to protect both site staff and patients from possible COVID-19 exposure. Given the safety concerns around COVID-19 and the associated risk to maintaining normal clinical trial operations, we are making decisions study-by-study and country-by-country to minimize the risk to the patients and facilities, and there has been and may continue to be an impact on the timing of trials that are under active enrollment. The majority of clinical trials that were paused at the onset of the pandemic have resumed, however we are continuing to experience impact to enrollment for some studies. We are actively implementing remote and local procedures per guidance of the FDA.

The extent to which the COVID-19 pandemic impacts our business, including our commercial results and clinical trials, will depend on future developments, which are highly uncertain and cannot be predicted with confidence, such as the ultimate geographic spread of the virus, the duration of the outbreak, governmental regulations and restrictions, travel restrictions and actions to contain the outbreak or treat its impact. We continue to be responsive to the ever-changing situation while remaining true to our core values.

Products and Development Programs

We focus our product development programs on life-transforming therapeutics for rare diseases and devastating conditions for which current treatments are either non-existent or inadequate. We have developed or are developing innovative products for, among others, the following indications:

Paroxysmal Nocturnal Hemoglobinuria (PNH) PNH is a chronic, progressive, debilitating and life-threatening ultra-rare blood disorder characterized by intravascular hemolysis (destruction of red blood cells) that is mediated by an uncontrolled activation of the complement system, a part of the immune system. PNH red blood cells are exquisitely vulnerable to activated complement, resulting in chronic intravascular hemolysis (IVH). Chronic IVH in patients with PNH may be associated with life-threatening thromboses, recurrent pain, kidney disease, disabling fatigue, impaired quality of life, severe anemia, pulmonary hypertension, shortness of breath and intermittent episodes of dark-colored urine (hemoglobinuria). A small sub-set of PNH patients on C5-inhibitor treatment may experience clinically evident extravascular hemolysis (PNH-EVH).

Atypical Hemolytic Uremic Syndrome (aHUS) aHUS is a severe and life-threatening, ultra-rare genetic disease characterized by chronic uncontrolled complement activation and thrombotic microangiopathy (TMA), the formation of blood clots in small blood vessels throughout the body, causing a reduction in platelet count (thrombocytopenia) and life-threatening damage to the kidney, brain, heart and other vital organs.

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Generalized Myasthenia Gravis (gMG) Myasthenia Gravis (MG) is a debilitating, complement-mediated neuromuscular disease in which patients suffer profound muscle weakness throughout the body, resulting in slurred speech, impaired swallowing and choking, double vision, upper and lower extremity weakness, disabling fatigue, shortness of breath due to respiratory muscle weakness and episodes of respiratory failure.

Hypophosphatasia (HPP) HPP is an ultra-rare genetic and progressive metabolic disease in which patients experience devastating effects on multiple systems of the body, leading to debilitating or life-threatening complications. HPP is characterized by defective bone mineralization that can lead to deformity of bones and other skeletal abnormalities, as well as systemic complications such as profound muscle weakness, seizures, pain, and respiratory failure leading to premature death in infants.

Lysosomal Acid Lipase Deficiency (LAL Deficiency or LAL-D) LAL-D is a serious, life-threatening ultra-rare disease associated with premature mortality and significant morbidity. LAL-D is a chronic disease in which genetic mutations result in decreased activity of the LAL enzyme that leads to marked accumulation of lipids in vital organs, blood vessels, and other tissues, resulting in progressive and systemic organ damage including hepatic fibrosis, cirrhosis, liver failure, accelerated atherosclerosis, cardiovascular disease, and other devastating consequences.

Neuromyelitis Optica Spectrum Disorder (NMOSD) NMOSD is a severe and ultra-rare autoimmune disease of the central nervous system (CNS) that primarily affects the optic nerves and the spinal cord. Each relapse of the disorder results in a stepwise accumulation of disability, including blindness and paralysis, and sometimes premature death. Complement activation due to anti-AQP4 antibodies is one of the primary underlying causes of the destruction of vital cells in the central nervous system in patients with NMOSD.

Anticoagulant Effects of Factor Xa Inhibitors Factor Xa inhibitors (i.e. apixaban, rivaroxaban and edoxaban), may rarely cause patients to be hospitalized with life-threatening or uncontrolled bleeding. Potential events include intracranial hemorrhage; intraocular, pericardial, intraspinal, intraarticular bleeding at critical sites; major gastrointestinal, retroperitoneal, or genitourinary bleeding; and bleeding associated with major blunt or penetrating injury.

Wilson Disease Wilson disease is a rare disorder, characterized by excess copper stored in various body tissues, that can lead to severe liver disease, including cirrhosis and acute liver failure, as well as debilitating neurological morbidities such as impaired movement, gait, speech, swallowing, and psychiatric disorders.

Warm Autoimmune Hemolytic Anemia (WAIHA) WAIHA is a rare autoimmune disorder caused by pathogenic immunoglobulin G (IgG) antibodies that react with and cause the premature destruction of red blood cells at normal body temperature. The disease is often characterized by profound, and potentially life-threatening anemia and other acute complications, including severe and life-threatening hemolysis, severe weakness, enlarged spleen and/or liver, rapid heart rate (tachycardia), chest pain, heart failure and fainting (syncope).

Amyotrophic Lateral Sclerosis (ALS) ALS is a progressive neurodegenerative disease of the CNS characterized by the loss of upper (brain) and lower (spinal cord) motor neurons. Ongoing loss of motor neurons and muscle strength leads to loss of independence, paralysis and death, typically due to respiratory insufficiency.

 C3 Glomerulopathy (C3G) C3G is a rare, chronic disease affecting the kidneys in which the alternative pathway of the complement system is dysregulated due to genetic mutations or autoantibodies affecting the regulation of the alternative pathway. This lack of regulation results in the alternative pathway overactivation and the excessive deposition of C3 protein fragments in the glomeruli, a key filtration component of the kidney, often leading to serious kidney damage.

Relapsed/refractory B-and T-cell malignancies The B cell non-Hodgkin lymphomas (NHLs) are a diverse group of disorders of proliferating malignant B cells. Collectively, NHL is the eighth leading type of cancer in the U.S., with B-cell lymphomas diagnosed in approximately 85% to 90% of patients. The T cell lymphomas are represented by diverse histologies depending on the malignant cell of origin. T cell NHL comprises approximately 10% to 15% of the total cases of NHL. Patients present with fever, night sweats, and unintentional weight loss. With progressive disease, the malignant cells metastasize from lymph nodes and bone marrow to other organs, ultimately resulting in organ failure. Front-line therapy consists of combination chemotherapy with rituximab. Experimental agents are in development to address patients who relapse or are refractory to front-line therapy. There are no curative therapies in the relapsed/refractory setting.

Transthyretin Amyloidosis (ATTR) Transthyretin (TTR) amyloidosis (ATTR) is a systemic, progressive, life-threatening disease wherein misfolded TTR protein forms fibrils that deposit in organs and tissues, disrupting normal organ function and tissue structure. ATTR is segmented into mutant/hereditary (ATTRm) caused by mutations in the TTR gene and wild type (ATTRwt)/non-hereditary with no mutations in the TTR gene.
Phenotypically, ATTR amyloidosis is heterogeneous: •ATTR cardiomyopathy (ATTR-CM), caused by the accumulation of misfolded TTR amyloid in the heart, leading to heart failure •ATTR polyneuropathy (ATTR-PN), caused by the accumulation of misfolded TTR amyloid in the peripheral and/or autonomic-nervous system. These deposits can damage patients’ sensory-motor ability, while also impairing normal cardiovascular and digestive function •While ATTRwt is, by definition, a cardiac disease, ATTRm is more heterogeneous, and can present with various degrees of cardiac and neurological manifestations

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Hematopoietic Stem Cell Transplantation Associated Thrombotic Microangiopathy (HSCT-TMA) Thrombotic microangiopathy (TMA) is a disorder that may occur following hematopoietic stem cell transplant (HSCT), often presenting in the setting of multiple triggers, including endothelial insult, immune dysregulation, and uncontrolled complement activation. The TMA has a significant impact, typically resulting in severe organ dysfunction and long-term morbidity and death. Mortality in patients with HSCT-TMA is approximately 60% with severe TMA approaching 90%.

Lupus Nephritis (LN) Lupus nephritis occurs in approximately 50% of patients with systemic lupus erythematosus (SLE), an autoimmune disorder caused by loss of tolerance to self-antigens, the production of autoantibodies, and deposition of complement-fixing immune complexes (ICs) in injured tissues. Chronic kidney disease is an independent major risk factor in lupus nephritis for overall mortality and morbidity, attributed to cardiovascular disease and septic shock.

Immunoglobulin A Nephropathy (IgAN) Immunoglobulin A nephropathy (IgAN), also known as Berger’s disease, is the most common global primary glomerulonephropathy that can progress to renal failure. IgAN is a lifelong disease leading to chronic kidney disease. IgAN progresses to end-stage renal disease in 30% to 40% of patients over the course of 20 to 30 years.

Guillain-Barré Syndrome (GBS) Guillain-Barré syndrome (GBS) is a rare, but potentially fatal neuropathy, with rapid-onset muscle weakness caused by the immune system damaging the peripheral nervous system. The symptoms may develop over hours to a few weeks and can be life-threatening with many patients requiring mechanical ventilation. It is the most common cause of acute flaccid tetraplegia worldwide.

COVID-19
Coronaviruses are a family of viruses that can cause illnesses such as the common cold, severe acute respiratory syndrome (SARS) and Middle East respiratory syndrome (MERS). In 2019, a new coronavirus was identified that is now known as the severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) and the disease it causes is called coronavirus disease 2019 (COVID-19). In March 2020, the World Health Organization (WHO) declared the COVID-19 outbreak a pandemic. Signs and symptoms of COVID-19 may appear two to 14 days after exposure and can include fever, cough, shortness of breath or difficulty breathing. The severity of COVID-19 symptoms can range from very mild to very severe. Some people may have no symptoms at all. People who are older or who have pre-existing diagnosed or undiagnosed medical conditions, such as heart disease, lung disease and/or diabetes, or who have a compromised or overreacting immune system may be at higher risk of serious illness or complications and may require assisted ventilation as well as urgent critical care.

AL Amyloidosis
Light chain (AL) amyloidosis (AL-A) is the most common form of systemic amyloidosis. The clinical manifestations of AL-A are caused by the accumulation in tissues and organs (primarily heart, kidneys, and liver) of amyloid made of misfolded immunoglobulin light chains, produced by plasma cell dyscrasia. Progressive amyloid deposition eventually results in organ dysfunction with high morbidity and mortality. The degree of cardiac amyloid deposition and cardiac complications are the most important prognostic determinant. The Mayo staging system (European modification) stratifies patients in stage I, II, IIIa and IIIb for increasing levels of circulating cardiac biomarkers (NTproBNP and cardiac troponin) and highly influences both treatment and prognosis of AL-A. Early mortality remains a high unmet medical need especially for patients with cardiomyopathy: median survival is approximately 4 months in patients with stage IIIb presentation.

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Marketed Products

Our marketed products consist of the following:

Product	Therapeutic Area	Approved Indication
	Hematology	Paroxysmal Nocturnal Hemoglobinuria (PNH)
	Hematology/Nephrology	Atypical Hemolytic Uremic Syndrome (aHUS)
	Hematology	Paroxysmal Nocturnal Hemoglobinuria (PNH)
	Hematology/Nephrology	Atypical Hemolytic Uremic Syndrome (aHUS)
	Neurology	Generalized Myasthenia Gravis (gMG)
	Neurology	Neuromyelitis Optica Spectrum Disorder (NMOSD)
	Metabolic Disorders	Hypophosphatasia (HPP)
	Metabolic Disorders	Lysosomal Acid Lipase Deficiency (LAL-D)
	Acute Care	Reversal of anticoagulation in patients treated with Factor Xa inhibitors when experiencing life-threatening or uncontrolled bleeding.

ULTOMIRIS (ALXN1210/ravulizumab-cwvz)

ULTOMIRIS is an innovative, long-acting C5 inhibitor discovered and developed by Alexion that works by inhibiting the C5 protein in the terminal complement cascade. In clinical studies, ULTOMIRIS demonstrated rapid, complete, and sustained reduction of free C5 levels.

In December 2018, ULTOMIRIS was approved by the U.S. Food and Drug Administration (FDA) as a new treatment option for adult patients with PNH in the U.S.

ULTOMIRIS was approved as a new treatment option for adult patients with PNH by Japan's Ministry of Health, Labour, and Welfare (MHLW) in June 2019. ULTOMIRIS was approved by the European Commission (EC) in July 2019 as a treatment for adult patients with PNH with hemolysis with clinical symptoms indicative of high disease activity, and also for adult patients who are clinically stable after having been treated with SOLIRIS for at least the past six months.

In October 2019, the FDA approved the use of ULTOMIRIS as a treatment for adult and pediatric (one month of age or older) patients with aHUS to inhibit complement-mediated TMA.

In June 2020, the EC approved ULTOMIRIS for the treatment of adults and children with a body weight of 10kg or above with aHUS who are complement inhibitor treatment-naïve or have received SOLIRIS (eculizumab) for at least three months and have evidence of response to eculizumab.

In September 2020, ULTOMIRIS was approved by Japan's MHLW as a new treatment option for adult and pediatric patients with aHUS.

In October 2020, ULTOMIRIS 100 mg/mL formulation was approved by the FDA for the treatment of adult patients with PNH and for adults and pediatric (one month of age or older) patients with aHUS to inhibit complement-mediated TMA. In November 2020, ULTOMIRIS 100 mg/mL formulation was approved by the EC for treatment of PNH and aHUS. The 100 mg/mL formulation is a higher concentration formulation of ULTOMIRIS than the formulation initially approved in December 2018. ULTOMIRIS 100 mg/mL reduces average annual infusion times by approximately 60 percent compared to ULTOMIRIS 10 mg/mL while delivering safety and efficacy consistent with the ULTOMIRIS 10 mg/mL formulation.

SOLIRIS (eculizumab)

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SOLIRIS is an innovative C5 inhibitor discovered and developed by Alexion that works by inhibiting the C5 protein in the terminal complement cascade. SOLIRIS is a humanized monoclonal antibody that effectively blocks terminal complement activity at the doses currently prescribed.

SOLIRIS is approved for the treatment of PNH and aHUS in pediatric and adult patients in the U.S., Europe, Japan and in several other countries. Alexion is sponsoring multinational registries to gather information regarding the natural history of patients with PNH and aHUS and the longer-term outcomes during anti-C5 treatment.

In 2017, the FDA and EC regulatory authorities approved SOLIRIS for the treatment of gMG in adults who are anti-acetylcholine receptor (AChR) antibody-positive. Additionally, in 2017, the MHLW in Japan approved SOLIRIS as a treatment for patients with gMG who are AChR antibody-positive and whose symptoms are difficult to control with high-dose intravenous immunoglobulin therapy or plasmapheresis (PLEX).

In June 2019, SOLIRIS became the first FDA-approved treatment option for adult patients with NMOSD who are AQP4 auto antibody positive. In August 2019, the EC approved SOLIRIS as the first treatment in Europe for NMOSD in adults who are AQP4 antibody-positive with a relapsing course of the disease. In November 2019, the Japanese MHLW approved SOLIRIS as a treatment for the prevention of relapse in patients with AQP4 antibody-positive NMOSD, including Neuromyelitis Optica.

STRENSIQ (asfotase alfa)

STRENSIQ, a targeted enzyme replacement therapy, is the first and only approved therapy for patients with HPP and is designed to directly address underlying causes of HPP by aiming to restore the genetically defective metabolic process, thereby preventing or reversing the severe and potentially life-threatening complications in patients with HPP. STRENSIQ is approved in the U.S. for patients with perinatal-, infantile- and juvenile-onset HPP, in Europe for the treatment of patients with pediatric-onset HPP, and in Japan for the treatment of patients with HPP. Alexion is sponsoring a multinational registry to gather information regarding the natural history of patients with HPP and the longer-term outcomes during STRENSIQ treatment.

KANUMA (sebelipase alfa)

KANUMA, a recombinant form of the human LAL enzyme, is the only enzyme-replacement therapy that is approved for the treatment for patients with LAL-D. KANUMA is approved in the U.S. for the treatment of patients with LAL-D, in Europe for long-term enzyme replacement therapy in patients with LAL-D, and in Japan for the treatment of patients with LAL-D. Alexion is sponsoring a multinational registry to gather information regarding the natural history of patients with LAL-D and the longer-term outcomes during KANUMA treatment.

ANDEXXA (coagulation factor Xa - [recombinant] inactivated-zhzo)

ANDEXXA is approved by the FDA as a reversal agent for patients treated with rivaroxaban or apixaban, when reversal of anticoagulation is needed due to life-threatening or uncontrolled bleeding. ANDEXXA was approved under the FDA’s Accelerated Approval Pathway, and received conditional marketing authorization in the EU based on the change from baseline in anti-Factor Xa activity in healthy volunteers and in patients through the ANNEXXA-4 trial demonstrating hemostatic efficacy. Continued approval for this indication is contingent upon post-marketing study results that verify that clinical benefit is conferred to patients.

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Alexion Pharmaceuticals, Inc.

(amounts in millions, except per share amounts)

Clinical Development Programs

Our ongoing clinical development programs include the following:

Product	Mechanism of Action	Development Area	Indication	Phase I	Phase II	Phase III	Phase IV	Filed
ULTOMIRIS (ALXN1210/ravulizumab-cwvz) (Intravenous)	Anti-C5	Neurology Pulmonology Nephrology	gMG/NMOSD/ALS/ COVID-19/HSCT-TMA/IgAN/LN			l
ULTOMIRIS (ALXN1210/ravulizumab-cwvz) (Subcutaneous)	Anti-C5	Hematology/Nephrology	PNH/aHUS			l
ALXN1720 (Subcutaneous)	Anti-C5	Next Generation Subcutaneous Complement Inhibitor		l
ALXN1820 (Subcutaneous)	Anti-Properdin	Subcutaneous Complement Inhibitor		l
ALXN1830 (SYNT001) (Subcutaneous)	Anti-FcRN	Hematology Neurology		l
ALXN1840 (WTX101)	High-affinity, specific Cu binder	Metabolic Disorders	Wilson disease			l
ALXN2040 (ACH-4471/danicopan)	Factor D Inhibitor	Hematology/Nephrology	PNH-EVH			l
ALXN2050 (ACH-5228)	Factor D Inhibitor	Hematology/Nephrology	PNH		l
ALXN2060 (AG10)	TTR Stabilizer	Metabolic Disorders	ATTR-CM			l
ALXN2070 (ANDEXXA)	Anti-Factor Xa Reversal	Acute Care	Reversal of anticoagulation in patients treated with Factor Xa inhibitors when experiencing life-threatening or uncontrolled bleeding.				l
ALXN2075 (Cerdulatinib)	Dual spleen tyrosine kinase and janus kinase (SYK/JAK) inhibitor	Oncology	Relapsed/refractory chronic lymphocytic leukemia or B cell or T cell NHL		l
SOLIRIS (eculizumab)	Anti-C5	Neurology	GBS			l
CAEL-101	Chimeric Monoclonal Antibody	Metabolic Disorders	AL Amyloidosis			l

ULTOMIRIS (ALXN1210/ravulizumab-cwvz)

ULTOMIRIS is an innovative, long-acting C5 inhibitor discovered and developed by Alexion that works by inhibiting the C5 protein in the terminal complement cascade. In clinical studies, ALXN1210 demonstrated rapid, complete, and sustained reduction of free C5 levels.

Intravenous (IV)

In January 2019, Alexion announced that the Phase III, global, single arm, multicenter study evaluating the safety and efficacy of ALXN1210 administered by IV infusion every 8 weeks to adult patients with aHUS who had never been treated with a complement inhibitor (inhibitor-naïve patients) met its primary objective. In the study's initial 26-week

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Alexion Pharmaceuticals, Inc.

(amounts in millions, except per share amounts)

treatment period, 53.6 percent of patients demonstrated complete TMA response. A second Phase III, single arm, multicenter study to evaluate the safety, efficacy, pharmacokinetics (PK), and pharmaco-dynamics (PD) of ALXN1210 administered by IV infusion every 8 weeks in inhibitor-naïve pediatric patients (including adolescents) with aHUS is ongoing.

In March 2019, Alexion initiated a Phase III double-blind, placebo-controlled, multicenter study to evaluate the safety and efficacy of ALXN1210 in adult patients for the treatment of gMG. Additionally, in December 2019, Alexion initiated a Phase III, single arm, open-label, multicenter study to evaluate the safety and efficacy of ALXN1210 in adult patients with NMOSD.

In March 2020, Alexion initiated a Phase III, randomized, double-blind, placebo-controlled, multicenter study to evaluate the efficacy and safety of ALXN1210 in patients with ALS.

In May 2020, following the FDA's acceptance of Alexion's IND application, Alexion initiated a Phase III open-label, randomized, controlled clinical trial of ALXN1210 in adult patients with COVID-19, who are hospitalized with severe COVID-19 requiring mechanical ventilation. The trial is investigating the role of terminal complement inhibition in managing patients with severe COVID-19. In January 2021, we paused further enrollment in this study due to lack of efficacy, pending further analysis of the data. This decision was made based on the recommendation of an independent data monitoring committee (IDMC), following their review of data from a pre-specified interim analysis.

In August 2020, Alexion submitted an application to the Japanese Pharmaceuticals and Medical Devices Agency (PMDA) to register the ULTOMIRIS 100mg/ml formulation. The 100 mg/mL formulation is a higher concentration formulation of ULTOMIRIS than the formulation initially approved in December 2018. ULTOMIRIS 100 mg/mL reduces average annual infusion times by approximately 60 percent compared to ULTOMIRIS 10 mg/mL while delivering safety and efficacy consistent with the ULTOMIRIS 10 mg/mL formulation.

In December 2020, Alexion initiated two Phase III, multicenter studies to evaluate the safety and efficacy of ALXN1210 in adult and pediatric HSCT-TMA populations.

In February 2021, Alexion initiated a Phase II, proof of concept study in two renal indications, LN and IgAN.

In addition to aHUS, gMG, NMOSD, ALS, COVID-19, HSCT-TMA, LN and IgAN, Alexion plans to initiate a Phase III study of ALXN1210 in complement mediated thrombotic microangiopathy (CM-TMA) in the second quarter of 2021 and a Phase II/III study in

dermatomyositis (DM), a rare autoimmune inflammatory myopathy characterized by chronic inflammation and degeneration of muscle and skin, in the second half of 2021.

Subcutaneous (SC) Delivery

In March 2019, Alexion initiated a PK-based Phase III study of ALXN1210 delivered subcutaneously once per week to PNH patients to support regulatory approval submissions in both PNH and aHUS. In June 2020, Alexion announced that the ongoing study met its primary objective of pharmacokinetic-based non-inferiority of ULTOMIRIS SC versus intravenous (IV) ULTOMIRIS at Day 71. Pending completion of the study and collection of required 12-month safety data, Alexion expects to file for approval for the SC formulation and device combination in PNH and aHUS in the U.S. in the third quarter of 2021 and in the E.U. in the first quarter of 2022.

ALXN1720

ALXN1720 is a novel humanized bi-specific minibody that binds selectively and with high affinity to C5 and to albumin. ALXN1720 is designed for subcutaneous administration as a concentrated formulation for the treatment of disease states involving dysregulated terminal complement activity. In September 2019, Alexion initiated a Phase I healthy volunteer study of ALXN1720 to assess its safety and tolerability. This trial was paused due to the COVID-19 pandemic, however, we expect to re-initiate it in the second quarter of 2021. Additionally, pending successful completion of the Phase I healthy volunteer study, we plan to initiate ALXN1720 trials in gMG and DM.

ALXN1820

ALXN1820 is a bispecific minibody binding to properdin and albumin and is a first-in-class therapeutic antagonist of properdin, with potent, selective activity, attractive PK-PD, subcutaneous bioavailability and safety profile. In December 2020, Alexion submitted a clinical trial application to Human Research Ethics Committees (HREC) in Australia. Approval was received and notification was sent to Australia’s Therapeutic Goods Administration for ALXN1820 in December 2020. In the first quarter of 2021, we initiated a healthy volunteers Phase I study. Early preclinical data for ALXN1820 indicate the potential for convenient, weekly, self-administered subcutaneous dosing. There are multiple potential indications for ALXN1820 across a number of therapeutic areas, including hematology, pulmonology, nephrology and dermatology, where properdin is believed to play an important role.

ALXN1830 (SYNT001)

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Alexion Pharmaceuticals, Inc.

(amounts in millions, except per share amounts)

ALXN1830 is a humanized monoclonal antibody that is designed to inhibit the interaction of the neonatal Fc receptor (FcRn) with IgG and IgG immune complexes and has the potential to improve treatment in a number of rare IgG-mediated diseases. Alexion initiated a Phase I study of a SC formulation of ALXN1830 in healthy volunteers in December 2019. Alexion re-initiated a Phase II trial of the IV formulation in WAIHA in early 2020. Due to the COVID-19 pandemic, Alexion discontinued the Phase II trial in WAIHA and the Phase I healthy volunteer study. A new Phase I healthy volunteer study initiated in March 2021, while the Phase II studies in WAIHA and gMG exclusively with the SC formulation are planned to start in the second half of 2021.

ALXN1840 (WTX101)

ALXN1840, an innovative product candidate that addresses the underlying cause of Wilson disease, is a first-in-class oral copper-binding agent with a unique mechanism of action that has the ability to access and mobilize copper from tissue. In February 2020, Alexion completed enrollment in a Phase III study of ALXN1840 for the treatment of Wilson disease. We expect top-line results from this Phase III study in the third quarter of 2021.

ALXN1850

ALXN1850 is an enzyme replacement therapy replacing deficient alkaline phosphatase (ALP) activity and targets ALP substrates to improve bone mineralization and ameliorate systemic manifestations of the disease. It is a next generation HPP therapy that is designed to provide higher activity, higher bioavailability, and longer half-life than STRENSIQ (asfotase alfa). These improvements may result in significant benefit for HPP patients, including potentially lower, less frequent doses, improved efficacy and lower injection volumes when compared to STRENSIQ. ALXN1850 is designed for subcutaneous administration. In November 2020, Alexion submitted an Investigational New Drug application (IND) for ALXN1850 to the FDA and received approval to proceed with a Phase I study in HPP patients. We plan to initiate the Phase I study in the second quarter of 2021.

ALXN2040 (danicopan/ACH-4771)

ALXN2040 is an oral Factor D inhibitor designed to treat diseases associated with dysregulation of the complement alternative pathway. ALXN2040 as an add on therapy to anti-C5 for PNH patients with clinically evident extravascular hemolysis (EVH) has received orphan drug and breakthrough therapy designation by the FDA and both orphan and PRIME designation by EMA. Two Phase II studies of ALXN2040 as an oral add-on therapy for PNH-EVH are ongoing, and a Phase III trial for PNH-EVH was

initiated, with dosing of the first patient in the first quarter of 2021.

We plan to initiate a Phase II study of ALXN2040 in geographic atrophy, a chronic and progressive degeneration of the portion of the retina responsible for central and color vision and leading to permanent loss of visual acuity, in the second half of 2021. In March 2021, Alexion submitted an IND to the FDA for geographic atrophy.

ALXN2050 (ACH-5228)

ALXN2050 is an oral Factor D inhibitor designed to treat diseases associated with dysregulation of the complement alternative pathway. ALXN2050 is in a Phase II trial as a potential monotherapy treatment for PNH and is being evaluated for development in other alternative pathway-mediated rare diseases. In April 2021, we resumed enrollment in the Phase II study of ALXN2050 monotherapy which is underway in PNH patients based on the receipt of further Phase I data. Additionally, Alexion plans to initiate proof-of-concept trials of ALXN2050 in patients with various renal diseases including C3G, in the second half of 2021.

ALXN2060 (AG10)

In September 2019, Alexion entered into an agreement with Eidos Therapeutics, Inc. (Eidos), through which Alexion obtained an exclusive license to develop and commercialize AG10 in Japan for transthyretin amyloidosis (ATTR). In January 2021, BridgeBio Pharma, Inc. (BridgeBio) completed its acquisition of all the outstanding shares of Eidos common stock that BridgeBio did not already own. AG10 is an orally administered small molecule in development designed to target the root cause of ATTR by stabilizing transthyretin (TTR) in the blood. BridgeBio (formerly Eidos) is currently studying AG10 in a Phase III clinical trial in patients with ATTR cardiomyopathy (ATTR-CM) and a Phase III clinical trial in patients with ATTR polyneuropathy (ATTR-PN), excluding Japan. In the fourth quarter 2020, Alexion initiated a single arm AG10 Phase III study in ATTR-CM in Japan. The Japan Phase III study data for ATTR-CM is expected to bridge to the global randomized controlled Phase III study being conducted by BridgeBio (formerly Eidos), and serve as the basis for seeking regulatory approval to commercialize AG10 in Japan.

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Alexion Pharmaceuticals, Inc.

(amounts in millions, except per share amounts)

ALXN2070 (ANDEXXA)

ANDEXXA, our commercialized medicine, has additional clinical trials currently being conducted to obtain full regulatory approvals and to expand the approved indications. As noted above, ANDEXXA has obtained accelerated approval in the US and conditional marketing authorization in the EU based on the change from baseline in anti-Factor Xa activity in healthy volunteers, and in patients through the ANNEXA-4 trial. Full approval in the US and EU for current indications requires completion of ANNEXA-I, a Phase IV randomized controlled clinical trial currently underway evaluating the safety and efficacy of ANDEXXA versus standard of care in patients presenting with acute intracranial hemorrhage while taking an oral Factor Xa inhibitor. A US supplemental Biologics License Application (sBLA) submission for a label expansion for the reversal of edoxaban and enoxaparin associated bleeds occurred in the fourth quarter of 2020. A Japan J-NDA filing was submitted in the first quarter 2021 to obtain full approval of ANDEXXA by the end of the third quarter of 2021.

Additionally, we plan to initiate a Phase II study in 2021 for the reversal of anticoagulation in patients taking apixaban, rivaroxaban, edoxaban, or enoxaparin who require urgent surgery.

ALXN2075 (Cerdulatinib)

ALXN2075 is a small molecule SYK/JAK inhibitor in development for treatment of hematological malignancies. We are reviewing clinical data and considering follicular lymphoma as a next step in the program. A Phase I/IIa study was completed in the first quarter 2021 for the treatment of hematological malignancies and we are determining next steps for ALXN2075.

SOLIRIS (eculizumab)

SOLIRIS is an innovative C5 inhibitor discovered and developed by Alexion that works by inhibiting the C5 protein in the terminal complement cascade. SOLIRIS is a humanized monoclonal antibody that effectively blocks terminal complement activity at the doses currently prescribed.

In June 2020, Japan’s MHLW granted SAKIGAKE designation for SOLIRIS in Guillain-Barré syndrome (GBS). Results from the Japanese eculizumab trial for GBS (JET-GBS study) suggested the potential efficacy and safety of SOLIRIS as a treatment for GBS. Complement activation may play a role in the pathophysiology of GBS. Alexion initiated a Phase III study of SOLIRIS in GBS in Japan in the first quarter of 2021.

CAEL-101

Alexion holds a minority interest in and an exclusive option to acquire Caelum Biosciences

(Caelum), a biotechnology company that is developing CAEL-101 for light chain (AL) amyloidosis. We have consolidated Caelum into our condensed consolidated financial statements due to the terms of our agreement with Caelum, as amended in March 2021 (refer to Note 10, Caelum Biosciences for additional information on our agreement).

CAEL-101 is a first-in-class chimeric monoclonal antibody (mAb) designed to improve organ function by reducing or eliminating amyloid deposits in the tissues and organs of patients with AL amyloidosis, a rare systemic disorder caused by an abnormality of plasma cells in the bone marrow. A Phase Ia/Ib study for CAEL-101 has been completed. Following discussions with the FDA, a Phase II trial for CAEL-101 commenced during the first quarter of 2020. The trial met its primary objectives, supporting the safety and tolerability of CAEL-101 and confirmed the dose and regimen to be adopted for the Phase III studies. In September 2020, Alexion and Caelum announced the initiation of the Cardiac Amyloid Reaching for Extended Survival (CARES) program. This includes two parallel Phase III trials to evaluate the survival benefits of CAEL-101. Dosing is underway in the two parallel Phase 3 studies; one in patients with Mayo stage IIIa disease and one in patients with Mayo stage IIIb disease.

Manufacturing

We utilize both internal manufacturing facilities and third-party contract manufacturers to supply clinical and commercial quantities of our products and product candidates. Our internal manufacturing capability includes our Ireland facilities, a fill/finish facility in Athlone, and a packaging facility in Dublin, as well as a KANUMA production facility in Georgia. Third party contract manufacturers, including Lonza Group AG and its affiliates (Lonza), provide cell bank services, bulk drug substance, drug product and finished product, as well as other manufacturing services like purification, product filling, finishing, packaging, and labeling.

We have various agreements with Lonza to provide cell bank and drug substance through 2030, with remaining total non-cancellable commitments of approximately $1,432.1. If we terminate certain supply agreements with Lonza without cause, we will be required to pay for product scheduled for manufacture under our arrangements. Under an existing arrangement with Lonza, we pay Lonza a royalty on the sales of SOLIRIS and ULTOMIRIS manufactured at Lonza facilities. In the fourth quarter 2020, Lonza received FDA approval for a new manufacturing facility in New Hampshire that will manufacture STRENSIQ for commercial use. Commitments entered into under this arrangement are included in the non-cancellable commitments previously noted.

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Alexion Pharmaceuticals, Inc.

(amounts in millions, except per share amounts)

In addition, we have non-cancellable commitments of approximately $125.7 through 2023 with other third-party manufacturers.

In April 2014, we purchased a fill/finish facility in Athlone, Ireland, which has been refurbished to become our first company-owned fill/finish facility. We have also completed construction of a new biologics manufacturing facility at this site and we are currently pursuing regulatory approvals.

In May 2015, we announced plans to construct a new biologics manufacturing facility on our existing property in Dublin, Ireland. Construction of this facility has been completed. In January 2021, the European Medicines Agency (EMA) approved the facility as a manufacturer of drug substance for SOLIRIS. In April 2021, the FDA approved the facility as a manufacturer of drug substance for SOLIRIS.

While we continue to actively engage with regulators, the timing of regulatory approval for our biologics manufacturing facility in Athlone, Ireland may be delayed as a result of the COVID-19 pandemic.

Critical Accounting Policies and Estimates

The significant accounting policies and basis of preparation of our consolidated financial statements are described in Note 1, Business Overview and Summary of Significant Accounting Policies of the Consolidated Financial Statements included in our Form 10-K for the year ended December 31, 2020. Under accounting principles generally accepted in the U.S., we are required to make estimates and assumptions that affect the reported amounts of assets, liabilities, revenues, expenses and disclosure of contingent assets and liabilities in our financial statements. We believe the most complex judgments result primarily from the need to make estimates about the effects of matters that are inherently uncertain and are significant to our consolidated financial statements. We base our estimates on historical experience and on various other assumptions that we believe are reasonable, the results of which form the basis for making judgments about the carrying values of assets and liabilities. We evaluate our estimates, judgments and assumptions on an ongoing basis. Actual results could differ materially from those estimates.

We believe the judgments, estimates and assumptions associated with the following critical accounting policies have the greatest potential impact on our consolidated financial statements:

•Revenue recognition;

•Contingent liabilities;

•Share-based compensation;

•Valuation of acquired assets, including goodwill, intangible assets and inventory;

•Valuation of contingent consideration; and

•Income taxes.

For a complete discussion of these critical accounting policies, refer to “Critical Accounting Policies and Use of Estimates” within “Item 7 - Management's Discussion and Analysis of Financial Condition and Results of Operations” included within our Annual Report on Form 10-K for the year ended December 31, 2020. There have been no significant changes to the critical accounting policies.

New Accounting Pronouncements

For information on new accounting pronouncements adopted in the current period and recently issued standards, refer to Note 2, Basis of Presentation and Principles, to our condensed consolidated financial statements included elsewhere in this Quarterly Report on Form 10-Q.

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Alexion Pharmaceuticals, Inc.

(amounts in millions, except per share amounts)

Results of Operations

Net Product Sales

Net product sales by significant geographic region for the three months ended March 31, 2021 and 2020 are as follows:

	Three months ended
	March 31,				%
	2021		2020		Change
SOLIRIS
United States	$	553.9	$	556.2	(0.4)	%
Europe	251.3		263.5		(4.6)	%
Asia Pacific	102.4		87.1		17.6	%
Rest of World	120.0		116.1		3.4	%
Total	$	1,027.6	$	1,022.9	0.5	%
ULTOMIRIS
United States	$	206.9	$	131.5	57.3	%
Europe	63.8		33.8		88.8	%
Asia Pacific	73.3		57.1		28.4	%
Rest of World	2.9		0.4		625.0	%
Total	$	346.9	$	222.8	55.7	%
STRENSIQ
United States	$	155.2	$	128.1	21.2	%
Europe	18.9		24.0		(21.3)	%
Asia Pacific	17.0		13.6		25.0	%
Rest of World	6.4		6.5		(1.5)	%
Total	$	197.5	$	172.2	14.7	%
ANDEXXA
United States	$	25.3	$	—	**
Europe	3.6		—		**
Asia Pacific	—		—		**
Rest of World	—		—		**
Total	$	28.9	$	—	**
KANUMA
United States	$	17.1	$	16.4	4.3	%
Europe	10.8		7.5		44.0	%
Asia Pacific	1.2		0.9		33.3	%
Rest of World	5.7		1.9		200.0	%
Total	$	34.8	$	26.7	30.3	%
Total Net Product Sales	$	1,635.7	$	1,444.6	13.2	%

** Percentages not meaningful

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Alexion Pharmaceuticals, Inc.

(amounts in millions, except per share amounts)

Net Product Sales

United States	Asia Pacific
Europe	Rest of World

SOLIRIS net product sales

United States	Asia Pacific
Europe	Rest of World

ULTOMIRIS net product sales

United States	Asia Pacific
Europe	Rest of World

STRENSIQ net product sales

United States	Asia Pacific
Europe	Rest of World

ANDEXXA net product sales

United States	Asia Pacific
Europe	Rest of World

KANUMA net product sales

United States	Asia Pacific
Europe	Rest of World

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Alexion Pharmaceuticals, Inc.

(amounts in millions, except per share amounts)

The increase in net product sales for the three months ended March 31, 2021, as compared to the same period in 2020, was primarily due to an increase in unit volumes. The increase in unit volumes was primarily due to increased global demand for SOLIRIS therapy, with sales to patients with gMG and NMOSD being the largest drivers. As a result of continued patient conversion, ULTOMIRIS unit volumes for PNH and aHUS also increased due to an increase in PNH and aHUS patients on ULTOMIRIS therapy. Offsetting this increase was the continued conversion of PNH and aHUS patients from SOLIRIS to ULTOMIRIS, resulting in a decrease in SOLIRIS PNH and aHUS revenues for the three months ended March 31, 2021, as compared to the same period in 2020. Additional unit volume increases were due primarily to increased global demand for STRENSIQ during 2021 and contributions of $28.9 from ANDEXXA as a result of the Portola acquisition that closed in the third quarter of 2020.

As a result of patient conversion from SOLIRIS to ULTOMIRIS, we experience variability in our revenues due to the extended ULTOMIRIS dosing interval and infusion timing which may result in either one or two infusions in a quarter. ULTOMIRIS loading doses for PNH patients result in increased revenues during a patient’s first year on therapy. The ULTOMIRIS annual maintenance dose for PNH and aHUS requires fewer vials as compared to the annual dose for SOLIRIS. Due to the decision to price ULTOMIRIS lower than SOLIRIS on an annual basis, U.S. revenues have been and will continue to be unfavorably impacted by the lower annual cost per patient in maintenance years, with the impact more pronounced for aHUS due to the greater decrease in vials for aHUS ULTOMIRIS patients.

In response to the COVID-19 pandemic, we have taken proactive measures that are designed to mitigate the risk of potential supply interruptions, and we strive to maintain sufficient inventory levels to continue serving current and new patients receiving our medicines for approved indications. Due to quarantines, travel restrictions, hospital policies and patient concerns regarding exposure to COVID-19, we have observed fewer patient/doctor interactions, we have also noted that the new patient productivity and initiation queue has decreased since the COVID-19 outbreak (particularly in our neurological indications) and our representatives are having fewer in-person visits with health care providers, including for infusion of our products which has adversely impacted our revenue growth and may continue to affect our revenue growth in the future. However, we are proactively engaging with healthcare professionals virtually and through enhanced digital channels in an effort to mitigate this risk.

Cost of Sales (exclusive of amortization of purchased intangible assets)

Cost of sales includes manufacturing costs, actual and estimated royalty expenses associated with sales of our products, and amortization of licensing rights.

The following table summarizes cost of sales for the three months ended March 31, 2021 and 2020:

	2021 Cost of Sales
	2020 Cost of Sales
●	Cost of sales as a percentage of net product sales

Cost of sales as a percentage of net product sales was 7.7% for the three months ended March 31, 2021 and 2020.

As a result of the Portola acquisition completed on July 2, 2020, we expect cost of goods sold to increase in future periods as compared to prior periods due to the amortization of ANDEXXA inventory fair value step-up adjustments which will be recognized as the acquired ANDEXXA inventory is sold.

Research and Development Expense

	2021 Research and Development Expense (R&D)
	2020 Research and Development Expense (R&D)
●	R&D as a % of net product sales

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Alexion Pharmaceuticals, Inc.

(amounts in millions, except per share amounts)

Our research and development expense includes personnel, facility and direct costs associated with the research and development (R&D) of our product candidates, as well as product development costs.

R&D expenses are comprised of costs paid for clinical development, product development and discovery research, as well as costs associated with certain strategic licensing agreements and R&D-related asset purchase agreements which we have entered into with third parties. Clinical development costs are comprised of costs to conduct and manage clinical trials related to product candidates. Product development costs are those incurred in performing duties related to manufacturing development and regulatory functions, including manufacturing of material for clinical and research activities and other administrative costs incurred during product development. Discovery research costs are incurred in conducting laboratory studies and performing preclinical research for other uses of our current products and other new product candidates. Upfront payments include upfront payments related to strategic licensing agreements and R&D-related asset purchase agreements. Subsequent milestone payments incurred under such agreements which relate to R&D activities are classified as clinical, discovery or product development costs based on the nature of the underlying milestone event.

Other R&D expenses consist of costs to compensate personnel, to maintain our facilities and equipment, and other occupancy costs associated with our research and development efforts. These costs relate to efforts for our clinical and preclinical candidates, our product development and our discovery research efforts. These costs have not been allocated directly to each program.

The following graph provides information regarding research and development expenses for the three months ended March 31, 2021 and 2020: 

Clinical Development	Discovery
Product Development	Payroll and Benefits
Upfront Payments	Facilities and Other

For the three months ended March 31, 2021, the increase in research and development expense, as compared to the same period in the prior year, was primarily related to the following:

•Increase of $41.3 in payroll and benefits primarily related to headcount increases.

•Increase of $33.6 in product development primarily driven by increased costs associated with manufacturing of material for ALXN1830 and ALXN1210.

•Increase of $12.9 in clinical development primarily driven by increased clinical expenses related to ALXN1210 for multiple ongoing studies; shared expenses related to investments in enhanced systems and processes to support our clinical trial expansion; and clinical expenses related to assets acquired from Portola in the third quarter of 2020. See chart below for additional details by program.

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Alexion Pharmaceuticals, Inc.

(amounts in millions, except per share amounts)

The following graph summarizes research and development expenses related to our clinical development programs. Please refer to "Clinical Development Programs" above for a description of certain of these programs:

2021 2020

The successful development of our drug candidates is uncertain and subject to a number of risks. We cannot guarantee that results of clinical trials will be favorable or sufficient to support regulatory approvals for any of our product development programs. We could decide to abandon development or be required to spend considerable resources not otherwise contemplated. For additional discussion regarding the risks and uncertainties regarding our research and development programs, please refer to Item 1A “Risk Factors” in this Quarterly Report on Form 10-Q.

Selling, General and Administrative Expense

	2021 Selling General and Administrative Expense (SG&A)
	2020 Selling General and Administrative Expense (SG&A)
●	SG&A as a % of net product sales

Our selling, general and administrative expense includes commercial and administrative personnel, corporate facility and external costs required to support the marketing and sales of our commercialized products. These selling, general and administrative costs include: corporate facility operating expenses and depreciation; marketing and sales operations in support of our products; human resources; finance, legal, information technology and support personnel expenses; and other corporate costs such as telecommunications, insurance, audit, government affairs and our global corporate compliance program.

The graph below provides information regarding selling, general and administrative expense:

Salary, benefits and other labor expense

External selling, general and administrative expense

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Alexion Pharmaceuticals, Inc.

(amounts in millions, except per share amounts)

For the three months ended March 31, 2021 as compared to the three months ended March 31, 2020, the increase of $23.0 in selling, general and administrative expense was primarily related to an increase in salary, benefits and other labor expenses of $38.8 driven by increases in headcount. This increase was partially offset by a decrease in external selling, general and administrative expense of $15.8, primarily related to litigation charges recorded during the first quarter of 2020 in connection with legal proceedings.

Amortization of Purchased Intangible Assets

For the three months ended March 31, 2021 and 2020, we recorded $53.2 and $73.7, respectively, in amortization expense related to purchased intangible assets. Amortization expense is primarily associated with intangible assets related to STRENSIQ, KANUMA and ANDEXXA.

The decrease in amortization of purchased intangible assets for the three months ended March 31, 2021, as compared to the same period in 2020, was primarily due to a decrease in amortization associated with the KANUMA intangible asset. During the second quarter of 2020, we recorded an impairment charge of $2,042.3 to write-down the KANUMA intangible asset to fair value. The lower asset value is contributing to lower amortization expense for the three months ended March 31, 2021 as compared to the three months ended March 31, 2020. This decrease was partially offset by an increase in amortization associated with our ANDEXXA intangible asset acquired in connection with the Portola acquisition, which closed during the third quarter of 2020.

Change in Fair Value of Contingent Consideration

For the three months ended March 31, 2021 and 2020, the change in fair value of contingent consideration expense associated with our prior business combinations was $9.2 and $5.8, respectively. The change in the fair value of contingent consideration will fluctuate based on the timing of recognition of changes in the probability of achieving contingent milestones, the expected timing of

milestone payments in connection with previous acquisitions and the discount rates used to calculate fair value. Changes in the fair value of contingent consideration primarily relate to contingent amounts due in connection with our acquisitions of Enobia in 2012 and Achillion in 2020.

For the three months ended March 31, 2021, changes in the fair value of contingent consideration expense reflected changes in the expected timing of achieving contingent milestone payments and the interest component of contingent consideration related to the passage of time. For the three months ended March 31, 2020, changes in the fair value of contingent consideration expense reflected the interest component of contingent consideration related to the passage of time.

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Alexion Pharmaceuticals, Inc.

(amounts in millions, except per share amounts)

Acquired In-Process Research and Development

For the three months ended March 31, 2021, we recorded acquired in-process research and development (IPR&D) expense of $193.3 in connection with the amendment of our agreement with Caelum Biosciences (Caelum) which occurred during the first quarter 2021. As a result of the amendment, we became the primary beneficiary of Caelum and began consolidating Caelum as a variable interest entity. Substantially all of the fair value of the gross assets of Caelum is concentrated in a single in-process research and development asset, CAEL-101. Due to the stage of development of this asset at the date of consolidation, significant risk remained and it was not yet probable that there was future economic benefit from this asset. Absent successful clinical results and regulatory approval for the asset, there is no alternative future use associated with CAEL-101. Accordingly, the value of this asset of $193.3 was expensed during the first quarter of 2021.

Acquisition-related Costs

For the three months ended March 31, 2021 and 2020, we recorded $13.2 and $38.1, respectively, of acquisition-related costs. For the three months ended March 31, 2021, acquisition-related costs primarily consist of transaction costs associated with our Merger Agreement with AstraZeneca and integration costs associated with our Portola acquisition. For the three months ended March 31, 2020, acquisition-related costs primarily consist of transaction costs

associated with our Achillion acquisition, costs associated with the accelerated vesting of stock options previously granted to Achillion employees and employee separation costs associated with our Achillion acquisition.

Gain on Sale of Assets

For the three months ended March 31, 2021, we recognized $25.3 in gain on sale of assets, primarily relating to a change in the estimate of variable consideration expected to be received in connection with our prior sale of the ALXN1101 program to Origin. Under the terms of the agreement with Origin, Alexion is entitled to receive contingent payments upon the achievement of various regulatory and commercial milestones, including Origin’s receipt of a Rare Pediatric Disease Priority Review Voucher (PRV), as well as royalties on commercial sales. In the first quarter of 2021, ALXN1101, now branded as NULIBRY™ (fosdenopterin), received approval from the FDA. Origin also received a PRV in connection with this approval. No amounts were recorded during the three months ended March 31, 2020.

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Alexion Pharmaceuticals, Inc.

(amounts in millions, except per share amounts)

Other Income and (Expense)

The following table provides information regarding other income and expense:

Investment expense, net

Interest expense

Other income and (expense)

For the three months ended March 31, 2021 and 2020, we recognized investment expense, net of $(7.0) and $(5.2), respectively, primarily related to the recognition of unrealized losses of $9.6 and $9.2, respectively, on our strategic equity investments recorded at fair value. Unrealized losses recorded during the three months ended March 31, 2021 on our strategic equity investments were primarily driven by an unrealized loss on our BridgeBio (formerly Eidos) equity investment. Unrealized losses recorded during the three months ended March 31, 2020 on our strategic equity investments were largely driven by temporary market declines due to the COVID-19 pandemic.

Income Taxes

	2021 Income tax expense
	2020 Income tax expense
●	Effective tax rate

During the three months ended March 31, 2021, we recorded an income tax expense of $113.4 and an effective tax rate of 18.8%, respectively, compared to an income tax expense of $106.0 and an effective tax rate of 16.0%, respectively, for the three months ended March 31, 2020.

Income tax expense is attributable to the U.S. federal, state and foreign income taxes on our profitable operations.

The increase in the effective tax rate for the three months ended March 31, 2021 as compared to the same period in the prior year is primarily attributable to the consolidation of Caelum during the first quarter 2021. Caelum's net loss included in our condensed consolidated statement of operations for the three months ended March 31, 2021 was $196.0, including acquired in-process research and development expense of $193.3, for which no tax benefit has been recognized. This resulted in an increase to the effective tax rate of 5.2% for the three months ended March 31, 2021.

In April 2020 we became aware of a European withholding tax regulation that could be interpreted to apply to certain of our previous intra-group transactions. We recorded an immaterial reserve related to this matter during the second quarter of 2020.

We continue to benefit from a reduced tax rate as a result of our centralized global supply chain and technical operations in Ireland.

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Alexion Pharmaceuticals, Inc.

(amounts in millions, except per share amounts)

We continue to maintain a valuation allowance when it is more likely than not that all or a portion of certain deferred tax assets will not be realized. We periodically evaluate the likelihood of realizing deferred tax assets and reduce the carrying amount of these deferred tax assets by a valuation allowance to the extent we believe a portion will not be realized.

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Alexion Pharmaceuticals, Inc.

(amounts in millions, except per share amounts)

Financial Condition, Liquidity and Capital Resources

The following table summarizes the components of our financial condition as of March 31, 2021 and December 31, 2020:

	March 31, 2021		December 31, 2020		$ Change
Cash and cash equivalents	$	3,429.6	$	2,964.5	$	465.1
Marketable securities	$	39.7	$	34.9	$	4.8
Long-term debt (includes current portion & revolving credit facility)	$	2,540.0	$	2,570.9	$	(30.9)
Current assets	$	6,452.6	$	5,833.0	$	619.6
Current liabilities	$	1,426.2	$	1,624.7	$	(198.5)
Working capital	$	5,026.4	$	4,208.3	$	818.1

The aggregate increase in cash and cash equivalents and marketable securities of $469.9 as of March 31, 2021 as compared to December 31, 2020 was primarily attributable to cash generated from operations partially offset by purchases of intangible assets.

We anticipate that cash generated from operations and our existing available cash, cash equivalents and marketable securities should provide us adequate resources to fund our operations as currently planned for at least the next twelve months.

We have financed our operations and capital expenditures primarily through positive cash flows from operations. We expect to continue to be able to fund our operations, including principal and interest payments on our Amended and Restated Credit Agreement, royalty-based debt and contingent payments associated with our in-licenses and acquisitions principally through our cash flows from operations. We may, from time to time, also seek additional funding through a combination of equity or debt financings or from other sources, if necessary for future acquisitions or other strategic purposes. New sources of financing through equity and/or debt financing(s), especially in light of increased volatility within the global financial markets as a result of the COVID-19 pandemic, may not always be available on acceptable terms, or at all, and we may be required to obtain certain consents in connection with completing such financings.

Without limiting the generality of the foregoing, we are subject to a variety of specified restrictions under the Merger Agreement. Unless we obtain AstraZeneca’s prior written consent (which consent may not be unreasonably withheld, conditioned or

delayed) and except (i) as required or expressly contemplated by the Merger Agreement, (ii) as required by applicable law or (iii) as set forth in the confidential disclosure schedule delivered by Alexion to AstraZeneca, we may not, among other things and subject to certain exceptions and aggregate limitations, incur additional indebtedness, issue additional shares of our common stock outside of our equity incentive plans, repurchase our common stock, pay dividends, acquire assets, securities or property, dispose of businesses or assets, enter into material contracts or make certain additional capital expenditures.

Financial Instruments

Until required for use in the business, we may invest our cash reserves in money market funds, bank deposits, and high quality marketable debt securities in accordance with our investment policy. The stated objectives of our investment policy are to preserve capital, provide liquidity consistent with forecasted cash flow requirements, maintain appropriate diversification and generate returns relative to these investment objectives and prevailing market conditions.

Financial instruments that potentially expose us to concentrations of credit risk are cash equivalents, marketable securities, accounts receivable and our derivative contracts. As of March 31, 2021, four customers accounted for 64.1% of the accounts receivable balance, with these individual customers accounting for 11.0% to 22.3% of the accounts receivable balance. As of December 31, 2020, four customers accounted for 66.8% of the accounts receivable balance, with these individual customers accounting for 11.7% to 22.1% of the accounts receivable balance.

For the three months ended March 31, 2021, three customers accounted for 54.5% of our net product sales with these individual customers accounting for 14.1% to 16.3% of our net product sales. For the three months ended March 31, 2020, four customers accounted for 58.3% of our net product sales with these individual customers accounting for 10.0% to 17.3% of our net product sales.

We continue to monitor economic conditions, including volatility associated with international economies and the COVID-19 pandemic, and the associated impacts on the financial markets and our business. Substantially all of our accounts receivable are due from wholesale distributors, public hospitals and other government entities. We monitor the financial performance of our customers so that we can appropriately respond to changes in their credit worthiness. We operate in certain jurisdictions where weakness in economic conditions can result in

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(amounts in millions, except per share amounts)

extended collection periods. We continue to monitor these conditions and assess their possible impact on our business. As a result of the COVID-19 pandemic, we have experienced an increase in requests for extended payment terms with certain customers. To date, we have not experienced any significant losses with respect to collection of our accounts receivable and do not currently anticipate any material credit losses on our accounts receivable as a result of the pandemic.

We manage our foreign currency transaction risk and interest rate risk within specified guidelines through the use of derivatives. All of our derivative instruments are utilized for risk management purposes, and we do not use derivatives for speculative trading purposes. As of March 31, 2021, we had foreign exchange forward contracts with notional amounts totaling $1,979.8. These outstanding foreign exchange forward contracts had a net fair value asset of $20.0, of which $41.6 is included in other current assets and other noncurrent assets and $21.6 is included in other current liabilities. As of March 31, 2021, we had interest rate swap contracts with notional amounts totaling $1,750.0. These outstanding interest rate swap contracts had a net fair value liability of $78.6 included in other current liabilities and other noncurrent liabilities. The counterparties to these contracts are large domestic and multinational commercial banks, and we believe the risk of nonperformance is not material.

As of March 31, 2021, our financial assets and liabilities were recorded at fair value. We have classified our financial assets and liabilities as Level 1, 2 or 3 within the fair value hierarchy. Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities. Our Level 1 assets consist of mutual fund investments and equity securities. Level 2 inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, but substantially the full term of the financial instrument. Our Level 2 assets consist primarily of money market funds, equity securities subject to holding period restrictions and derivative contracts. Our Level 2 liabilities consist also of derivative contracts. Level 3 inputs are unobservable inputs based on our own assumptions used to measure assets and liabilities at fair value. Our Level 3 liabilities consist of contingent consideration related to business acquisitions.

Business Combinations and Contingent Consideration Obligations

On January 28, 2020, we completed the acquisition of Achillion. Under the terms of the agreement, we acquired all outstanding common stock of Achillion for $6.30 per share, or an aggregate of $926.2, inclusive of the settlement of Achillion's outstanding equity awards. The acquisition was funded with cash on hand. The transaction includes the potential for additional consideration in the form of non-tradeable contingent value rights (CVRs), which will be paid to Achillion shareholders if certain clinical and regulatory milestones are achieved within specified periods. These include $1.00 per share for the U.S. Food and Drug Administration (FDA) approval of danicopan and $1.00 per share for the initiation of a Phase III clinical trial in ACH-5228 (ALXN2050).

On July 2, 2020, we completed the acquisition of Portola. Under the terms of the agreement, we acquired all outstanding common stock of Portola for $18.00 per share, or an aggregate of approximately $1,380.8, including the settlement of certain of Portola's outstanding equity awards but excluding shares of Portola stock held by Alexion at closing. The acquisition was funded with cash on hand. In connection with the acquisition, we also paid $196.9 to settle certain debt held by Portola that was subject to preexisting change of control provisions. The repayment of Portola's debt was funded with cash acquired from Portola. Additionally, we assumed royalty-based debt which requires repayment through tiered royalties on future net worldwide sales of ANDEXXA.

 As of March 31, 2021, the purchase agreements for our business combinations, including Achillion, include contingent payments totaling up to $905.6 that will become payable if and when certain development and commercial milestones are achieved. Of these milestone amounts, $670.6 of the contingent payments relate to development and regulatory milestones and $235.0 of the contingent payments relate to commercial milestones, respectively. We do not expect these amounts to have a significant impact on our liquidity in the near term. In the first quarter of 2021, a sales-based milestone associated with our acquisition of Enobia Pharma Corp. was achieved. In connection with such achievement, we will make a $120.0 milestone payment in the second quarter of 2021. No additional milestone payments associated with our prior business combinations are expected during the next 12 months. As additional future payments become probable, we will evaluate methods of funding payments, which could be made from available cash and marketable securities, cash generated from operations, or proceeds from the sale of equity securities or debt.

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Alexion Pharmaceuticals, Inc.

(amounts in millions, except per share amounts)

Asset Acquisitions and In-License Agreements

In January 2019, we entered into an agreement with Caelum, a biotechnology company that is developing CAEL101 for light chain (AL) amyloidosis. Under the terms of the agreement, we acquired a minority equity interest in preferred stock of Caelum and an exclusive option to acquire the remaining equity in Caelum based on Phase II data, for pre-negotiated economics. We paid $30.0 in the first quarter 2019 and agreed to pay up to an additional $30.0 in contingent development milestones prior to the exercise of the option to acquire the remaining equity in Caelum. Following discussions with the FDA, Caelum changed its clinical development plan for CAEL-101 in the fourth quarter 2019. In December 2019, we amended the terms of the agreement with Caelum to modify the option to acquire the remaining equity in Caelum based on data from the modified Phase II/III trials. The amendment also modified the development-related milestone events associated with the initial $30.0 in contingent payments, provided for an additional $20.0 in upfront funding, as well as funding of $60.0 in exchange for an additional equity interest at fair value upon achievement of a specific development-related milestone event. We paid the additional $20.0 in upfront funding and the initial $30.0 in contingent payments in 2020. In March 2021, we further amended the terms of our agreement with Caelum. These amended terms with Caelum modified the previously agreed upon funding of $60.0 and included provisions to provide additional support to Caelum. Upon execution of the second amendment in March 2021, we provided $46.0 to Caelum in exchange for preferred equity and agreed to pay $14.0 upon achievement of a specified development milestone. We also committed to provide services to Caelum at no cost and to reimburse Caelum for costs incurred for incremental clinical trial activities that we requested be completed. As a result of the second amendment in March 2021, we became the primary beneficiary of Caelum and began consolidating Caelum as the incremental funding and support provides us the deemed power to direct the activities of Caelum that most significantly impact its economic performance. In the event we exercise the exclusive purchase option, the agreement provides for additional payments to Caelum for up to $500.0, which includes an upfront option exercise payment and potential regulatory and commercial milestone payments.

In March 2019, we entered into an agreement with Zealand which provides us with exclusive worldwide licenses, as well as development and commercial rights, for subcutaneously delivered preclinical peptide therapies directed at up to four complement pathway targets. Pursuant to the agreement, Zealand will lead joint discovery and research efforts through the preclinical stage, and

Alexion will lead development efforts beginning with the investigational new drug filing and Phase I studies. In addition to the agreement, we made an equity investment in Zealand (refer to Note 11, Other Investments). Under the terms of the agreement, we made an upfront payment of $40.0 for an exclusive license to the lead target and the equity investment, as well as for preclinical research services to be performed by Zealand in relation to the lead target. As of March 31, 2021, we could be required to pay up to $610.0, for the lead target, upon the achievement of specified development, regulatory and commercial milestones, as well as royalties on commercial sales. In addition, we could be required to pay up to an additional $115.0 in development and regulatory milestones if both a long-acting and short-acting product are developed with respect to the lead target. Each of the three subsequent targets can be selected for an option fee of $15.0 and has the potential for additional development, regulatory and commercial milestones, as well as royalty payments, at a reduced price to the lead target.

In September 2019, we entered into an agreement with Eidos through which Alexion obtained an exclusive license to develop and commercialize AG10 in Japan. AG10 is a small molecule designed to treat the root cause of transthyretin amyloidosis (ATTR) and is currently in a Phase III study in the U.S., Europe, and Japan for ATTR cardiomyopathy (ATTR-CM). In addition, we made an equity investment in Eidos (refer to Note 11, Other Investments). Under the terms of the agreement, we made an upfront payment of $50.0 for the exclusive license to AG10 in Japan and the equity investment. In January 2021, BridgeBio Pharma, Inc. (BridgeBio) completed its acquisition of all the outstanding shares of Eidos common stock that BridgeBio did not already own. As of March 31, 2021, we could be required to pay $30.0 upon achievement of a Japanese-based regulatory milestone as well as royalties on commercial sales.

In October 2018, we entered into a collaboration agreement with Dicerna that provides us with exclusive worldwide licenses and development and commercial rights for two preclinical RNA interference (RNAi) subcutaneously delivered molecules for complement-mediated diseases, as well as an exclusive option for other preclinical RNAi molecules for two additional targets within the complement pathway. In addition to the collaboration agreement, we made an equity investment in Dicerna. Under the terms of the agreements, we made an upfront payment of $37.0 for the exclusive licenses and the equity investment. In December 2019, we exercised our option for exclusive rights to two additional targets within the complement pathway under an existing agreement with Dicerna, which expands our existing research collaboration and license agreement with Dicerna to include a total of four targets within the

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(amounts in millions, except per share amounts)

complement pathway. In connection with the option exercise, we paid Dicerna $20.0 in the fourth quarter 2019. As of March 31, 2021, we could be required to pay up to $604.1 for amounts due upon the achievement of specified research, development, regulatory and commercial milestones on the four licensed targets, as well as royalties on commercial sales.

In December 2017, we entered into a collaboration and license agreement with Halozyme Therapeutics, Inc. that allows us to use drug-delivery technology in the development of subcutaneous formulations for our portfolio of products for up to four targets. Under the terms of the agreement, we made an upfront payment of $40.0 for an exclusive license to two of the four potential targets during the fourth quarter 2017. During the second quarter 2020, we forfeited our rights to one of the two targets we initially licensed. As of March 31, 2021, we could be required to pay up to $155.0 for the remaining licensed target upon achievement of specified development, regulatory and sales-based milestones, as well as royalties on commercial sales. Each of the two subsequent targets can be licensed for an option fee of $8.0, with contingent payments of up to $160.0 per target, subject to development, regulatory and commercial milestones, as well as royalties on commercial sales.

In connection with our prior acquisition of Syntimmune, Inc., a clinical-stage biotechnology company developing an antibody therapy targeting the FcRn, we could be required to pay up to $800.0 upon the achievement of specified development, regulatory and commercial milestones, of which $130.0 is specific to the subcutaneous formulation. We are currently subject to a claim in litigation in connection with the Syntimmune acquisition alleging that Alexion failed to meet its obligations under the merger agreement to use commercially reasonable efforts to achieve the milestones and plaintiff has requested payment of the full earn-out amount. The outcome on this litigation may have an impact on the results of our operations in the future.

In addition, as of March 31, 2021, we have other license agreements under which we may be required to pay up to an additional $114.1 for currently licensed targets, if certain development, regulatory and commercial milestones are met, including up to $71.5 for the development of cerdulatinib in multiple indications pursuant to an in-licensing agreement with Astellas Pharma, Inc. which was assumed through the acquisition of Portola in the third quarter 2020. Additional amounts may be payable if we elect to acquire licenses to additional targets, as applicable, under the terms of these agreements.

We do not expect the payments associated with milestones under our asset acquisitions, option and

in-license agreements to have a significant impact on our liquidity in the near-term. During the next 12 months, we incur make milestone payments related to our asset acquisitions, option and in-license agreements of approximately $155.1 as of March 31, 2021, inclusive of $14.0 of potential milestone payments due to Caelum, which has been consolidated as a variable interest entity as of the first quarter 2021. Additionally, in the event we exercise the exclusive purchase option with Caelum, the agreement provides for additional payments to Caelum for up to $500.0, which includes an upfront option exercise payment of $150.0 and potential regulatory and commercial milestone payments of up to $350.0. The pending acquisition of Alexion by AstraZeneca will accelerate the expiration period of the exclusive purchase option to 6-months after the close of the acquisition.

As additional future payments become probable, we will evaluate methods of funding payments, which could be made from available cash and marketable securities, cash generated from operations or proceeds from the sale of equity securities or debt.

Operating and Financing Lease Liabilities

Operating and financing lease liabilities are recorded at lease commencement and upon remeasurement events, if applicable, based on the present value of fixed, or in substance fixed, lease payments over the expected lease term. Lease liabilities are amortized over the lease term.

As of March 31, 2021, we have $270.6 of total financing and operating lease liabilities recorded on our condensed consolidated balance sheets. The total undiscounted lease commitments as of March 31, 2021 were $319.6, of which, $32.1 is payable during the remainder of 2021. We do not expect the payments associated with the maturity of lease liabilities to have a significant impact on our liquidity in the near-term.

Long-term Debt

On June 7, 2018, we entered into an Amended and Restated Credit Agreement (the Credit Agreement) with Bank of America N.A. as Administrative Agent. The Credit Agreement amended and restated our credit agreement dated as of June 22, 2015.

The Credit Agreement provides for a $1,000.0 revolving credit facility and a $2,612.5 term loan facility. The revolving credit facility and the term loan facility mature on June 7, 2023. Beginning with the quarter ended June 30, 2019, we are required to make payments of 5.0% of the original principal amount of the term loan facility annually, payable in equal quarterly installments.

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Alexion Pharmaceuticals, Inc.

(amounts in millions, except per share amounts)

As of March 31, 2021, we had $2,351.3 outstanding on the term loan. We had no outstanding borrowings under the revolving credit facility as of March 31, 2021. As of March 31, 2021, we had open letters of credit of $1.0 that offset our borrowing availability on the revolving credit facility.

In connection with our acquisition of Portola during the third quarter 2020, we assumed royalty-based debt relating to a royalty sales agreement Portola had entered into with HealthCare Royalty Partners (HCR) whereby HCR acquired a tiered royalty interest in future worldwide net sales of ANDEXXA. Portola received $50.0 upon closing of the agreement in February 2017 and an additional $100.0 following the U.S. regulatory approval of ANDEXXA in May 2018. Tiered royalties ranging from 4.2% to 8.5% are required to be paid to HCR based on net worldwide sales of ANDEXXA. The applicable rate decreases as worldwide net annual sales levels increase above defined thresholds. Total potential royalty payments are capped at 195.0% of the funding received less certain transaction expenses, or $290.6.

As of March 31, 2021, the royalty-based debt has a carrying value of $188.7, net of unamortized debt discount of $79.9, of which $16.3 was recorded within current portion of long-term debt. The maximum remaining royalty payments are capped at $268.6, as of March 31, 2021.

Manufacturing Obligations

We have supply agreements with Lonza relating to the manufacture of SOLIRIS, STRENSIQ, ULTOMIRIS and ANDEXXA which require payments to Lonza at the inception of contract and upon the initiation and completion of product manufactured. On an ongoing basis, we evaluate our plans for future levels of manufacturing by Lonza, which depends upon our commercial requirements and the progress of our clinical development programs.

We have various agreements with Lonza, with remaining total non-cancellable commitments of approximately $1,432.1 through 2030. Certain commitments may be canceled only in limited circumstances. If we terminate certain supply agreements with Lonza without cause, we will be

required to pay for product scheduled for manufacture under our arrangement. Under an existing arrangement with Lonza, we pay Lonza a royalty on the sales of SOLIRIS and ULTOMIRIS manufactured at Lonza facilities.

In addition to Lonza, we have non-cancellable commitments of approximately $125.7 through 2023 with other third party manufacturers.

Taxes

We have recorded tax on the undistributed earnings of our controlled foreign corporation (CFC) subsidiaries. To the extent CFC earnings may not be repatriated to the U.S. as a dividend distribution due to limitations imposed by law, we have not recorded the related potential withholding, foreign local, and U.S. state income taxes.

Common Stock Repurchase Program

In November 2012, our Board of Directors authorized a share repurchase program. In February 2017, our Board of Directors increased the amount that we are authorized to expend on future repurchases to $1,000.0 under our repurchase program, which superseded all prior repurchase programs. The entire amount authorized pursuant to this February 2017 Board approval has been utilized. On October 22, 2019, the Board of Directors approved a share repurchase authorization of up to $1,000.0. On July 28, 2020, the Board of Directors approved a new share repurchase authorization of up to an additional $1,500.0. The repurchase program does not have an expiration date and we are not obligated to acquire a particular number of shares. The repurchase program may be discontinued at any time at our discretion. We did not repurchase shares of our common stock during the three months ended March 31, 2021. Under the program, we repurchased 1.3 shares of our common stock at a cost of $107.1 during the three months ended March 31, 2020. As of March 31, 2021, there is a total of $2,024.7 remaining for repurchases under the repurchase programs.

Cash Flows

The following summarizes our net change in cash and cash equivalents:

	Three months ended March 31,				$
	2021		2020		Change
Net cash provided by operating activities	$	637.6	$	549.6	$	88.0
Net cash used in investing activities	(133.9)		(766.0)		632.1
Net cash used in financing activities	(18.7)		(138.2)		119.5
Effect of exchange rate changes on cash and restricted cash	(13.1)		(13.2)		0.1
Net change in cash and cash equivalents and restricted cash	$	471.9	$	(367.8)	$	839.7

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(amounts in millions, except per share amounts)

Operating Activities

Cash flows provided by operations for the three months ended March 31, 2021 was $637.6 compared to $549.6 for the three months ended March 31, 2020. The increase in cash provided by operating activities was primarily due to cash generated from operations, including the timing of cash receipts, payments and other changes in working capital, during the three months ended March 31, 2021 as compared to the same period in the prior year.

Investing Activities

Cash flows used in investing activities for the three months ended March 31, 2021 was $133.9 compared to $766.0 for the three months ended March 31, 2020. The decrease in cash used in investing activities as compared to the prior year was primarily due to payments for the acquisition of Achillion, net of cash acquired, of $837.7 during the three months ended March 31, 2020. The decrease was partially offset by an increase in purchases of intangible assets primarily related to the $100.0 Rare Pediatric Disease Priority Review Voucher (PRV) acquired from Rhythm Pharmaceuticals, Inc. (“Rhythm”) and by a decrease in net cash inflows attributable to purchases and sales of available for sale debt securities during the three months ended March 31, 2021 as compared to the same period in the prior year.

Financing Activities

Cash flows used in financing activities for the three months ended March 31, 2021 was $18.7 compared to $138.2 for the three months ended March 31, 2020. The decrease in cash used for financing activities was primarily due to a decrease of $107.1 in common stock repurchases during the three months ended March 31, 2021 as compared to the same period in the prior year.

Contractual Obligations

There have been no significant changes to the disclosure of payments we have committed to make under our contractual obligations as summarized in our Annual Report on Form 10-K for the twelve months ended December 31, 2020, in the section titled “Management's Discussion and Analysis of Financial Condition and Results of Operations” under the caption “Contractual Obligations.”

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Item 3.QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

        (amounts in millions, except

        percentages)

Interest Rate Risk

We have historically invested our cash in a variety of financial instruments, principally money market funds, bank deposits, corporate bonds, municipal bonds, commercial paper and government-related obligations which are subject to interest rate risk and could decline in value if interest rates fluctuate. Our investment portfolio has historically been comprised of marketable debt securities of highly rated financial institutions and investment-grade debt instruments, and we have guidelines to limit the term-to-maturity of our investments. During the second quarter of 2020, we liquidated all of our available-for-sale debt securities to fund the acquisition of Portola. As of March 31, 2021, our investment portfolio primarily consists of money market funds and mutual funds. Based on the type of securities we hold, we do not believe a change in interest rates would have a material impact on our financial statements. If interest rates were to increase or decrease by 1%, the fair value of our investment portfolio would increase (decrease) by an insignificant amount.

On June 7, 2018, we entered into an Amended and Restated Credit Agreement (the Credit Agreement), with Bank of America N.A. as administrative agent. The Credit Agreement amended and restated our credit agreement dated as of June 22, 2015. Loans under the Credit Agreement bear interest at our option, at either the base rate or a Eurodollar rate, in each case plus an applicable margin. Under the Credit Agreement, the applicable margins on base rate loans range from 0.25% to 1.00% and the applicable margins on Eurodollar loans range from 1.25% to 2.00%, in each case based on our consolidated net leverage ratio (as calculated in accordance with the Credit Agreement).

Changes in interest rates related to the Credit Agreement could have a material effect on our financial statements.

To achieve a desired mix of floating and fixed interest rates on our term loan, we entered into a number of interest rate swap agreements that qualified for and are designated as cash flow hedges. As of March 31, 2021 we had cash flow hedges with aggregate amounts of approximately 74.4% of our current outstanding term loan covering periods over the next twelve months. If interest rates were to increase or decrease by 1%, interest expense over the next year would increase or decrease by $5.4, based on the unhedged portion of our outstanding term loan as of March 31, 2021.

Foreign Exchange Market Risk

Our operations include activities in many countries outside the U.S. As a result, our financial results are impacted by factors such as changes in foreign currency exchange rates or weak economic conditions in the foreign markets where we operate. We have exposure to movements in foreign currency exchange rates, the most significant of which are the Euro, and Japanese Yen, against the U.S. dollar. We are a net receiver of many foreign currencies, and our consolidated financial results benefit from a weaker U.S. dollar and are adversely impacted by a stronger U.S. dollar relative to foreign currencies in which we sell our products.

Our monetary exposures on our balance sheet arise primarily from cash, accounts receivable, and payables denominated in foreign currencies. Approximately 40.2% of our net product sales were denominated in foreign currencies for the three months ended March 31, 2021, and our revenues are also exposed to fluctuations in the foreign currency exchange rates over time. In certain foreign countries, we may sell in U.S. dollar, but our customers may be impacted adversely by fluctuations in foreign currency exchange rates which may also impact the timing and amount of our revenue.

Both positive and negative impacts to our international product sales from movements in foreign currency exchange rates are only partially mitigated by the natural, opposite impact that foreign currency exchange rates have on our international operating expenses. Additionally, we have operations based in Europe and accordingly, our expenses are impacted by fluctuations in the value of the Euro against the U.S. dollar.

We currently have a derivative program in place intended to achieve the following: (1) limit the foreign currency exposure of our monetary assets and liabilities on our balance sheet, using contracts with durations of up to 3 months and (2) hedge a portion of our forecasted product sales (in some currencies), including intercompany sales using contracts with durations of up to 23 months. The objective of this program is to reduce the volatility of our operating results due to fluctuation of foreign exchange. This program utilizes foreign exchange forward contracts intended to reduce, not eliminate, the volatility of operating results due to fluctuations in foreign exchange rates.

As of March 31, 2021 and December 31, 2020, we held foreign exchange forward contracts with notional amounts totaling $1,979.8 and $3,253.5, respectively. As of March 31, 2021 and December 31, 2020, our outstanding foreign exchange forward contracts had a net fair value of $20.0 and $(55.2), respectively.

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We do not use derivative financial instruments for speculative trading purposes. The counterparties to these foreign exchange forward contracts are large domestic and multinational commercial banks. We believe the risk of counterparty nonperformance is not material.

Based on our foreign currency exchange rate exposures as of March 31, 2021, a hypothetical 10% adverse fluctuation in exchange rates would decrease the fair value of our foreign exchange forward contracts that are designated as cash flow hedges by approximately $86.1. The resulting loss on these forward contracts would be offset by the gain on the underlying transactions and therefore would have minimal impact on future anticipated earnings and cash flows. Similarly, adverse fluctuations in exchange rates that would decrease the fair value of our foreign exchange forward contracts that are not designated as hedge instruments would be offset by a positive impact of the underlying monetary assets and liabilities.

Credit Risk

As a result of our foreign operations, we are exposed to changes in the general economic conditions in the countries in which we conduct business. The majority of our receivables are due from wholesale distributors, public hospitals and other government entities. We monitor the financial performance and creditworthiness of our large customers so that we can properly assess and respond to changes in their credit profile. We continue to monitor these conditions, including the volatility associated with international economies, the COVID-19 pandemic and the relevant financial markets, and assess their possible impact on our business. Although collection of our accounts receivables from certain countries may extend beyond our standard credit terms and while we have seen and may continue to see an increase in requests for extended payment terms with certain customers as a result of the COVID-19 pandemic, we have not experienced any significant losses with respect to collection of our accounts receivable and we do not expect any such delays to have a material impact on our financial condition or results of operations.

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Item 4.CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

Our management, with the participation of our Chief Executive Officer and Chief Financial Officer, evaluated the effectiveness of our disclosure controls and procedures (as defined in Rules 13a-15(e) and 15d-15(e) under the Securities Exchange Act of 1934, as amended (Exchange Act), as of March 31, 2021. Based on this evaluation, our Chief Executive Officer and Chief Financial Officer concluded that, as of March 31, 2021, our disclosure controls and procedures were effective to provide reasonable assurance that information is accumulated and communicated to our management, including our Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely decisions regarding required disclosure, and ensure that information required to be disclosed in the reports we file or submit under the Exchange Act is recorded, processed, summarized and reported, within the time periods specified in the SEC's rules and forms.

Changes in Internal Control over Financial Reporting

There have been no changes in our internal control over financial reporting that occurred during the quarter ended March 31, 2021 that has materially affected, or is reasonably likely to materially affect, our internal control over financial reporting.

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PART II. OTHER INFORMATION

Item 1.LEGAL PROCEEDINGS.

For a discussion of legal matters as of March 31, 2021, refer to Note 17, “Commitments and Contingencies,” Contingent Liabilities, within our notes to the condensed consolidated financial statements included in this Quarterly Report on Form 10-Q, which is incorporated into this item by reference.

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Item 1A.Risk Factors.

(amounts in millions, except percentages)

You should carefully consider the following risk factors before you decide to invest in Alexion securities and our business, because the risks described below may have a material impact on our business, operating results, financial condition, and cash flows. The risks and uncertainties described below are not the only ones we face. Additional risks and uncertainties not presently known to us or that we currently deem immaterial may also impair our business operations. If any of the following risks actually occurs, our business, financial condition and results of operations could be materially and adversely affected.

Risk Factors Summary:

The following is a summary of the principal risks that could adversely affect our business, operations and financial results.

Risks Related to our Proposed Acquisition by AstraZeneca

•Our proposed acquisition by AstraZeneca is subject to various closing conditions and there can be no assurances as to whether and when it may be completed.

•Failure to complete the merger could negatively impact our stock price and future business and financial results.

•If the merger agreement is terminated, we may be obligated to pay a termination fee to AstraZeneca.

•Because the exchange ratio is fixed and the market price of shares of AstraZeneca stock fluctuates our stockholders cannot be sure of the value of the merger consideration they will receive in the merger.

•While the merger is pending, we are subject to business uncertainties and contractual restrictions that could materially adversely affect our operating results or result in a loss of employees, customers, collaborators or suppliers.

•Lawsuits may be filed against us and/or AstraZeneca challenging the merger. An adverse ruling in any such lawsuit may delay or prevent the proposed acquisition from being completed.

•We may have difficulty attracting, motivating and retaining executives and other key employees in light of the merger.

Risks Related to Revenue Concentration and Conversion

•If we are unable to continue to increase revenues from sales of our C5 complement inhibitors, our business would be materially harmed.

•If we are unable to achieve our conversion objectives of patients from SOLIRIS to ULTOMIRIS, our business may be harmed. In addition, even if we are successful, due to the pricing of ULTOMIRIS, our revenues may decrease unless we are able to increase the number of patients using our C5 inhibitors.

Risks Related to the COVID-19 Pandemic

•Our business may be adversely affected by the ongoing COVID-19 pandemic.

Risks Related to Pricing and Reimbursement

•Sales of our products depend on reimbursement by payers and these payers are subject to pressures to contain costs.

Risks Related to Intellectual Property

•If we cannot obtain new patents, maintain our existing patents and protect our trade secrets and other intellectual property, our business and competitive position may be harmed.

•If we are found to be infringing third party patents, we may be forced to pay damages and/or obtain a license. If we cannot obtain a license, we may be prevented from the manufacture, sale or development of our products or product candidates.

•It is possible that we could lose market exclusivity for a product earlier than expected.

Risks Related to Our Products and Product Candidates

•Our future commercial success depends on gaining regulatory approval for new products and obtaining approvals for existing products for new indications.

•Our products and product candidates target diseases with small patient populations and we may not be effective at identifying patients.

•We may not be able to gain or maintain market acceptance of our products among the medical community, patients or payers.

•If our products harm patients, or are perceived to harm patients, our regulatory approvals could be revoked or otherwise negatively impacted and we could be subject to costly and damaging product liability claims.

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•We anticipate that we will face increased competition from companies that will enter into the markets we currently serve and as we enter new markets.

Risks Related to Business Operations

•We rely on a limited number of facilities to produce our products and manufacturing issues at these facilities could cause product shortages, interrupt commercialization of our products, disrupt or delay our clinical trials or regulatory approvals, and adversely affect our business.

•We rely on a limited number of providers for our raw materials and supply chain services.

•Counterfeit versions of our products could result in significant harm to patients, reduced sales of our products and harm to our reputation.

•If we are unable to establish and maintain effective sales, marketing and distribution capabilities, we may be unable to successfully commercialize our products.

•Our efforts to expand our business and product offerings through acquisitions may not be successful.

•The acquired business of Portola may underperform relative to expectations, and we may not achieve anticipated synergies.

•In order to support potential growth of the business, we will be required to make significant investments in our business operations.

•Completion of preclinical studies or clinical trials does not guarantee advancement of development, regulatory approval or successful commercialization.

•Our clinical studies may be costly and lengthy, and there are many reasons why drug testing could be delayed or terminated.

•We expect our operating results to fluctuate.

•We cannot guarantee that we will achieve our financial goals, including our ability to maintain profitability in the future.

•If we fail to attract and retain highly qualified personnel, we may not be able to successfully develop, manufacture or commercialize our products or products candidates.

•We may not achieve the expected benefits of our current and future restructuring plans and restructurings may adversely affect our business.

•If we fail to satisfy our debt service obligations or our contingent obligations, we may be unable to commercialize our products or continue or complete our product development.

•We may not be able to access the capital and credit markets on terms that are favorable to us or at all

•We have incurred significant impairment charges, and may continue to incur such charges in the future and such amounts may be material.

•The efficiency of our corporate structure depends on the application of the tax laws and regulations in the countries where we operate and we may have exposure to additional tax liabilities or our effective tax rate could increase, which could have a material impact on our financial results and position.

•Our sales and operations are subject to risks relating to our international business.

•Our business involves environmental risks and potential exposure to environmental liabilities.

•Currency fluctuations and changes in exchange rates could adversely affect our revenue, increase our costs and negatively affect our profitability.

Risks Related to the Regulatory Environment

•We operate in a highly regulated industry and if we or our third-party providers fail to comply with U.S. and foreign regulations, we could lose our approvals to market our products.

•Our product candidates require extensive clinical testing and failure to satisfy regulatory requirements may prevent us from being able to market our products and limit our ability to grow our business and diversify our revenue.

•If we fail to comply with applicable healthcare laws and regulations we may be subject to investigations and civil or criminal penalties and our business could be adversely affected.

•Our business could be adversely affected by litigation, regulatory enforcement actions and government investigations.

•Changes in healthcare laws and regulations, as well as changes in healthcare policy, may affect coverage and reimbursement of our products and these changes could adversely affect our business and financial condition.

•If we fail to comply with our reporting and payment obligations under governmental

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pricing programs, we could be subject to additional reimbursement requirements, penalties, sanctions and fines.

•The Public Health Service’s 340B drug pricing program, and other comparable government and payer regulations, may have a negative impact on the price we can charge for our products and result in a decrease in revenues.

•We may be subject to numerous and varying privacy and security laws, and our failure to comply could result in penalties and reputational damage.

•Security breaches, cyber-attacks or other disruptions could expose us to liability and affect our business and reputation.

•Negative public opinion of recombinant and transgenic products, genetically modified products and animals may damage public perception of our KANUMA product.

Risks Related to Our Common Stock

•Our stock price is volatile.

•Anti-takeover provisions in our charter and bylaws and under Delaware law could make a third-party acquisition of us difficult and may frustrate any attempt to remove our current management.

•The exclusive forum provision in our bylaws could limit our stockholders’ ability to obtain an alternate judicial forum for disputes with us.

Risk Factors:

Risks Related to our Proposed Acquisition by AstraZeneca

Our proposed acquisition by AstraZeneca is subject to various closing conditions, including regulatory and stockholder approvals as well as other uncertainties, and there can be no assurances as to whether and when it may be completed.

On December 12, 2020, we entered into an Agreement and Plan of Merger (Merger Agreement), with AstraZeneca, Delta Omega Sub Holdings Inc., a Delaware corporation and a wholly owned subsidiary of AstraZeneca (Bidco), Delta Omega Sub Holdings Inc. 1, a Delaware corporation and a direct wholly owned subsidiary of Bidco (Merger Sub I) and Delta Omega Sub Holdings LLC 2, a Delaware limited liability company and a direct wholly owned subsidiary of Bidco (Merger Sub II). Under the terms and subject to the conditions set forth in the Merger Agreement, Merger Sub I will merge with and into Alexion (the First Merger) with Alexion surviving the First Merger as a wholly-owned subsidiary of Bidco and, immediately

following the effective time of the First Merger (the Effective Time), Alexion will merge with and into Merger Sub II (the Second Merger and, together with the First Merger, the “Mergers”), with Merger Sub II surviving the Second Merger as a wholly owned subsidiary of Bidco and an indirect wholly owned subsidiary of AstraZeneca. Upon completion of the Mergers, each outstanding share of Alexion common stock, other than certain excluded shares (as described in the Merger Agreement) and shares held by stockholders who properly exercise their appraisal rights under Delaware law, will automatically be canceled and converted into the right to receive (1) 2.1243 American depositary shares of AstraZeneca (or, at the election of the holder thereof, a number of ordinary shares of AstraZeneca equal to the number of underlying ordinary shares represented by such American depositary shares) and (2) $60.00 in cash, without interest (the Merger Consideration).

Completion of the Mergers is subject to customary closing conditions, and it is possible that such conditions may prevent, delay or otherwise materially adversely affect the completion of the Mergers. These conditions include, among other things: (1) the adoption of the Merger Agreement by Alexion’s stockholders; (2) approval of the transactions contemplated by the Merger Agreement by AstraZeneca’s shareholders; (3) the absence of any law or order prohibiting the consummation of the Mergers; (4) AstraZeneca’s registration statement on Form F-4 having been declared effective by the Securities and Exchange Commission; (5) AstraZeneca’s shareholder circular (or, if required, prospectus) having been approved by the U.K. Financial Conduct Authority; (6) the American depository shares of AstraZeneca issuable in the Mergers (and the ordinary shares of AstraZeneca represented thereby) having been approved for listing on the Nasdaq; (7) the expiration or early termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976 (“HSR Act”), as amended, and the approval of the Mergers under the antitrust and foreign investment laws of other specified jurisdictions; (8) accuracy of the other party’s representations and warranties, subject to certain materiality standards set forth in the Merger Agreement and (9) compliance by the other party in all material respects with such other party’s obligations under the Merger Agreement.

The governmental authorities from which authorizations under antitrust and foreign investment laws, including the HSR Act, are required have broad discretion in administering the governing laws and regulations, and may take into account various facts and circumstances in their consideration of the Mergers, including other potential transactions in the pharmaceutical industry or other industries. These governmental authorities may initiate proceedings

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seeking to prevent, or otherwise seek to prevent, the Mergers. As a condition to authorization of the Mergers or related transactions, these governmental authorities also may impose requirements, limitations or costs, require divestitures or place restrictions on the conduct of AstraZeneca’s business after completion of the Mergers. Under the terms of the Merger Agreement, the parties have agreed to use their respective reasonable best efforts to complete the Mergers as promptly as reasonably practicable, including in obtaining each third party consent or regulatory approval necessary, proper or advisable to complete the Mergers, and AstraZeneca has agreed to (1) propose, negotiate, commit to, or effect any divestiture, (2) terminate, unwind, divest or assign, subcontract or otherwise secure substitute parties for relationships, ventures, and contractual or commercial rights or obligations, and (3) take any such other remedial action, in each case to permit the closing of the Mergers to occur as promptly as reasonably practicable.

We can provide no assurance that all required consents and approvals will be obtained or that all closing conditions will otherwise be satisfied (or waived, if applicable), and, if all required consents and approvals are obtained and all closing conditions are satisfied (or waived, if applicable), we can provide no assurance as to the terms, conditions and timing of such consents and approvals or the timing of the completion of the Mergers. Many of the conditions to completion of the Mergers are not within either our or AstraZeneca’s control, and neither company can predict when or if these conditions will be satisfied (or waived, if applicable). Any delay in completing the Mergers could cause us not to realize some or all of the benefits that we expect to achieve if the Mergers are successfully completed within its expected timeframe.

Failure to complete the Mergers could negatively impact our stock price and future business and financial results.

If the Mergers are not completed for any reason, including as a result of our stockholders failing to adopt the Merger Agreement or AstraZeneca shareholders failing to approve the transactions contemplated by the Merger Agreement, we will remain an independent public company. Our ongoing business may be materially and adversely affected and we would be subject to a number of risks, including the following:

•we may experience negative reactions from the financial markets, including negative impacts on trading prices of our common stock, and from our customers, collaborators, suppliers, regulators and employees;

•we may be required to pay AstraZeneca a termination fee of $1,180.0 if the Merger

Agreement is terminated under certain circumstances, including in the event Alexion’s board of directors changes its recommendation in favor of the Mergers or if Alexion terminates the Merger Agreement in order to enter into an agreement providing for a superior proposal, and $270.0 if the Merger Agreement is terminated because the Mergers are not adopted by Alexion stockholders;

•the Merger Agreement places certain restrictions on the conduct of our business prior to completion of the Mergers, and such restrictions, the waiver of which is subject to the consent of AstraZeneca, may prevent us from making certain acquisitions, entering into or amending certain contracts, taking certain other specified actions or otherwise pursuing business opportunities during the pendency of the Mergers that we would have made, taken or pursued if these restrictions were not in place; and

•matters relating to the Mergers (including integration planning) will require substantial commitments of time and resources by our management and the expenditure of significant funds in the form of fees and expenses, which would otherwise have been devoted to day-to-day operations and other opportunities that may have been beneficial to us as an independent company.

In addition, we could be subject to litigation related to any failure to complete the Mergers or related to any proceeding to specifically enforce our performance obligations under the Merger Agreement.

If any of these risks materialize, they may materially and adversely affect our business, financial condition, financial results and stock prices.

If the Merger Agreement is terminated, we may, under certain circumstances, be obligated to pay a termination fee to AstraZeneca.

If the Merger Agreement is terminated, in certain circumstances, including in the event Alexion’s board of directors changes its recommendation in favor of the Mergers or if Alexion terminates the Merger Agreement in order to enter into an agreement providing for a superior proposal, we would be required to pay a termination fee of $1,180.0 to AstraZeneca. In addition, we would be required to pay a termination fee of $270.0 if the Merger Agreement is terminated because the Mergers are not adopted by Alexion stockholders. If the Merger Agreement is terminated under such circumstances, the termination fee we may be required to pay under the Merger Agreement may require us to use available cash that would have otherwise been available for general

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corporate purposes and other uses. For these and other reasons, termination of the Merger Agreement could materially adversely affect our business operations and financial results, which in turn would materially and adversely affect the price of our common stock.

Because the exchange ratio is fixed and the market price of shares of AstraZeneca stock has fluctuated and will continue to fluctuate, our stockholders cannot be sure of the value of the Merger Consideration they will receive in the Mergers.

Upon completion of the Mergers, each share of our common stock outstanding immediately prior to the effective time of the Merger will be converted into the right to receive $60.00 in cash without interest thereon and 2.1243 American depositary shares of AstraZeneca (or, at the election of the holder thereof, a number of ordinary shares of AstraZeneca equal to the number of underlying ordinary shares represented by such American depositary shares). Because the exchange ratio of 2.1243 American depositary shares of AstraZeneca is fixed, the value of the share consideration will depend on the market price of shares of American depository shares of AstraZeneca at the time the Mergers are completed. The market price of American depositary shares of AstraZeneca has fluctuated since the date of the announcement of the Mergers and will continue to fluctuate from the date of this filing until the date the Mergers are completed, which could occur a considerable amount of time after the date hereof. AstraZeneca’s American depository share price changes may result from a variety of factors, including, among others, general market and economic conditions, changes in AstraZeneca’s and Alexion’s respective businesses, operations and prospects, risks inherent in their respective businesses, changes in market assessments of the likelihood that the Mergers will be completed and/or the value that may be generated by the Mergers, and changes with respect to expectations regarding the timing of the Mergers and regulatory considerations. Many of these factors are beyond our control.

While the Mergers are pending, we are subject to business uncertainties and contractual restrictions that could materially adversely affect our operating results, financial position and/or cash flows or result in a loss of employees, customers, collaborators or suppliers.

The Merger Agreement includes restrictions on the conduct of our business prior to the earlier of the completion of the Mergers or termination of the Merger Agreement, generally requiring us to use commercially reasonable efforts to conduct our business in all material respects in the ordinary course. Without limiting the generality of the foregoing, we are subject to a variety of specified restrictions. Unless we obtain AstraZeneca’s prior

written consent (which consent may not be unreasonably withheld, conditioned or delayed) and except (i) as required or expressly contemplated by the Merger Agreement, (ii) as prohibited or required by applicable law or (iii) as set forth in the confidential disclosure schedule delivered by Alexion to AstraZeneca, we may not, among other things and subject to certain exceptions and aggregate limitations, incur additional indebtedness, issue additional shares of our common stock outside of our equity incentive plans, repurchase our common stock, pay dividends, acquire assets, securities or property, dispose of businesses or assets, enter into material contracts or make certain additional capital expenditures. We may find that these and other contractual restrictions in the Merger Agreement delay or prevent us from responding, or limit our ability to respond, effectively to competitive pressures, industry developments and future business opportunities that may arise during such period, even if our management believes they may be advisable. The pendency of the Mergers may also divert management’s attention and our resources from ongoing business and operations.

Our employees, customers, collaborators and suppliers may experience uncertainties about the effects of the Mergers. It is possible that some customers, collaborators, suppliers and other parties with whom we have a business relationship may delay or defer certain business decisions or might decide to seek to terminate, change or renegotiate their relationship with us as a result of the Mergers. Similarly, current and prospective employees may experience uncertainty about their future roles with us following completion of the Mergers, which may materially adversely affect our ability to attract and retain key employees. If any of these effects were to occur, it could materially and adversely impact our operating results, financial position and/or cash flows and/or our stock price.

Lawsuits may be filed against us and/or AstraZeneca challenging the transactions contemplated by the Merger Agreement. An adverse ruling in any such lawsuit may delay or prevent the proposed acquisition from being completed.

Lawsuits arising out of or relating to the Merger Agreement, AstraZeneca’s registration statement on Form F-4 (which will include a document that serves as a prospectus of AstraZeneca and a proxy statement of Alexion) and/or the proposed acquisition of us by AstraZeneca may be filed in the future. One of the conditions to completion of the Mergers is the absence of any injunction or other order being in effect that prohibits completion of the Mergers. Accordingly, if a plaintiff is successful in obtaining an injunction, then such order may prevent the proposed acquisition from being completed, or from being completed within the expected timeframe.

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We may have difficulty attracting, motivating and retaining executives and other key employees in light of the Mergers.

Uncertainty about the effect of the Mergers on our employees may have an adverse effect on our business. This uncertainty may impair our ability to attract, retain and motivate key personnel. Employee retention may be particularly challenging during the pendency of the Mergers, as our employees may experience uncertainty about their future roles in the combined business. No assurance can be given that we will be able to attract or retain key employees to the same extent that we have been able to attract or retain employees in the past.

Risks Related to Revenue Concentration and Conversion

We depend on revenue from sales of our C5 complement inhibitors and, if we are unable to continue to increase revenues from sales of our C5 complement inhibitors, our business would be materially harmed and our future operating results may be adversely impacted.

Since 2007, our revenue has depended primarily on the sales of SOLIRIS, a C5 complement inhibitor with a 2-week dosing schedule. In December 2018, we obtained our first regulatory approval in the U.S. to sell ULTOMIRIS, a long-acting C5 complement inhibitor, with an 8-week dosing schedule (and in 2020 we obtained approval in the U.S. and Europe for a 100mg/mL formulation of ULTOMIRIS). Our C5 complement inhibitors accounted for 84.7% of our total revenues for the fiscal year ended December 31, 2020. Unless we are able to develop or acquire and commercialize new products beyond these C5 complement inhibitors, and/or materially increase sales of STRENSIQ, KANUMA and ANDEXXA® (our other approved products), we will remain dependent on sales of SOLIRIS and ULTOMIRIS as a source of our revenue. We expect our revenues for 2021 will continue to depend on our ability to sell our C5 complement inhibitors.

The commercial success of our C5 complement inhibitors and our ability to generate revenue depends on several factors, including: the safety and efficacy of our C5 complement inhibitors; coverage or reimbursement by government or third-party payers for our C5 complement inhibitors; pricing for our complement inhibitors; the analysis by doctors, payers and patients of the cost of our C5 complement inhibitors relative to the perceived benefits; manufacturing and uninterrupted supply; the introduction and success of competing products (including novel products and biosimilars to SOLIRIS); the size of patient populations and the number of patients diagnosed who may be treated with our C5 complement inhibitors; the impact of legal, administrative, regulatory or legislative developments

that impact the price or use of C5 complement inhibitors; and our ability to develop, obtain regulatory approval for and commercialize our C5 complement inhibitors for new indications. Any of these or other factors may cause revenues from sales of our C5 complement inhibitors to decrease, which would harm our business results.

While SOLIRIS and ULTOMIRIS are studied for indications beyond those currently approved by regulatory authorities and ULTOMIRIS is being studied for subcutaneous administration, there is no guarantee that we can obtain regulatory approval or achieve any commercial sales of SOLIRIS or ULTOMIRIS for such other indications or for subcutaneous administration of ULTOMIRIS. Nor can we guarantee that, even if regulatory approval is obtained for such additional indications and routes of administration, physicians and patients will accept SOLIRIS or ULTOMIRIS as a treatment for such indications or means of administration, or that payers will pay for or reimburse the costs of these therapies.

If we are not able to maintain revenues from sales of SOLIRIS and ULTOMIRIS, or such revenues decrease, our operating results would be negatively impacted and our ability to fund research and development, commercialize or acquire new products would be harmed, which would limit our ability to diversify our revenue base and our stock price could be adversely affected. In addition, as a result of having our revenue concentrated in SOLIRIS and ULTOMIRIS, our future revenues and results of operations can be significantly harmed by, among other factors, the introduction of one or more biosimilar products or other competitive products that treat the same indications, adverse developments in the commercialization and sale of our C5 inhibitors or a change in reimbursement policies by payers for the C5 complement inhibitors. For example, a biosimilar has been introduced in Russia and a CD19-directed cytolytic antibody treatment and an IL-6R antibody, were both recently approved for NMOSD patients in the U.S. and certain other jurisdictions.

We aim to facilitate the conversion of patients from SOLIRIS to ULTOMIRIS. If we are unable to achieve our conversion objectives, our business may be harmed. In addition, even if we are successful, due to the pricing of ULTOMIRIS, our revenues may decrease unless we are able to increase the number of patients using our C5 inhibitors.

ULTOMIRIS has been approved for patients with PNH and aHUS in certain jurisdictions, including in the U.S., Europe and Japan.

One of our principal business objectives is to facilitate the conversion of PNH and aHUS patients from SOLIRIS to ULTOMIRIS. While clinical trials in PNH patients demonstrated that ULTOMIRIS is non-inferior to SOLIRIS at an 8 week dosing interval

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(compared to a 2 week dosing interval for SOLIRIS), existing patients taking SOLIRIS for PNH or aHUS and their physicians may decline to switch to ULTOMIRIS. If we are unable to facilitate conversion to ULTOMIRIS prior to the loss of intellectual property or regulatory exclusivities for SOLIRIS, our future revenues could be adversely impacted if we were to face biosimilar competition for SOLIRIS. If ULTOMIRIS is approved as an indication for NMOSD and gMG, we will commence efforts to facilitate conversion of those SOLIRIS patients to ULTOMIRIS upon approval.

We have established what we believe is a globally sustainable and durable pricing strategy for ULTOMIRIS that is intended to facilitate such patient conversions (for example, in the U.S. the cost of current labeled maintenance therapy for ULTOMIRIS for adult PNH patients of average weight, represents on an annual basis an approximate 10% decrease relative to the cost of SOLIRIS). However, in the first year of PNH conversion to ULTOMIRIS, due to the loading doses required, there is an approximate 10% premium to the cost of SOLIRIS. We have also priced ULTOMIRIS for patients with aHUS in the U.S. at a cost relative to the cost of SOLIRIS for patients with aHUS in the U.S. that is approximately 30% less on an annual basis for an average adult patient on maintenance therapy (unlike PNH, the cost in the first year of aHUS conversion to ULTOMIRIS is approximately 20% less than the cost of SOLIRIS). If we achieve our goal of facilitating the conversion of patients from SOLIRIS (which accounted for approximately $4,064.2, or 67.0%, of our revenues in 2020) to ULTOMIRIS, due to the reduction in annual cost we anticipate that U.S. revenue attributable to each patient that converts from SOLIRIS to ULTOMIRIS will decrease on an annual basis. In addition, as a result of the decreased cost for ULTOMIRIS relative to SOLIRIS on a per patient basis, in order to maintain or increase C5 complement inhibitor revenues in the future as we succeed in converting patients from SOLIRIS to ULTOMIRIS, we must increase the total number of patients utilizing SOLIRIS, including gMG and NMOSD patients, and ULTOMIRIS.

Finally, as a result of patient conversion from SOLIRIS to ULTOMIRIS, we expect variability in our revenues in future quarters due to the extended ULTOMIRIS dosing interval and infusion timing which may result in either one or two infusions in a quarter.

Due to the decision to price ULTOMIRIS lower than SOLIRIS on an annual basis, we anticipate U.S. revenues will be unfavorably impacted by the lower annual cost per patient in maintenance years, with the impact more pronounced for aHUS due to the greater decrease in vials for aHUS ULTOMIRIS patients.

Risks Related to the COVID-19 Pandemic

Our business may be adversely affected by the ongoing COVID-19 pandemic.

Our business could be adversely affected by health epidemics in regions where we have operations, sales or other business activities, including regions where we have offices, manufacturing facilities, clinical trial sites and where our third party manufacturers, vendors and suppliers operate and where patients and potential patients are located. The outbreak of a novel strain of virus, which causes the disease called COVID-19, has evolved into a global pandemic. The ultimate impact of the COVID-19 pandemic on our business operations and financial results is highly uncertain and will depend on future developments, which cannot be accurately predicted, including the duration of the pandemic, the ultimate geographic spread of the disease, future spikes in cases, additional or modified government actions, new information that will emerge concerning the severity and impact of the coronavirus and the actions taken to address its impact, among others.

In May 2020, we initiated a global Phase III study to investigate ULTOMIRIS in a subset of adults with COVID-19, who are hospitalized with severe COVID-19 requiring mechanical ventilation. In January 2021, we paused further enrollment in this study based on the recommendation of an independent data monitoring committee (IDMC), following review of data from a pre-specified interim analysis. The IDMC recommended that additional enrollment be paused, pending further analysis of the data, due to lack of efficacy when ULTOMIRIS was added to best supportive care, compared to best supportive care alone. At this time, we cannot guarantee that the further analysis of study data would cause us to commence additional enrollment in the trial.

As a result of the COVID-19 pandemic, we expect that we may experience disruptions that could severely impact our business and results of operations, including:

•Government and healthcare policies and federal, state, local or foreign regulations to address the COVID-19 pandemic may adversely affect our sales and revenue. Due to quarantines, travel restrictions, hospital policies and patient concerns regarding exposure to COVID-19, we have observed fewer patient/doctor interactions, we have also noted that the new patient productivity and initiation queue has decreased since the COVID-19 outbreak (particularly in our neurological indications) and our representatives are having fewer in-person visits with health care providers, including for infusion of our products which has adversely impacted our revenue growth and may

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continue to affect our revenue growth in the future. A decrease in the demand of our products could cause our cost of goods sold to increase due to expiration of inventory on hand, an increase in manufacturing overhead allocated to inventory sold and other factors. Our net product sales could also be adversely impacted by the negative effects the COVID-19 pandemic has had on the global economy, which could result in (i) an increased number of patients utilizing our patient access programs to receive free drug due to loss of employer-based health insurance, or other factors impacting their ability to afford our medicines; and (ii) patients increasingly seeking Medicaid coverage for our products, which would lead to higher gross-to-net revenue reductions compared to commercial insurance providers. We are monitoring the impacts on our business of the growth in unemployment and loss of commercial insurance coverage and/or growth in Medicaid with higher discounts.

•Due to financial demands in addressing the COVID-19 pandemic, payors have requested and may continue to request extended credit terms, may extend payment dates beyond those experienced in the past, or may not be able to timely reimburse us for our products or at all, and such actions could have a material adverse impact on our cashflow from operations. Additionally, federal and state governments and foreign jurisdictions where we operate could increase tax rates to offset the economic impact and cost of addressing the COVID-19 pandemic. Any increase in such tax rates could have an adverse impact on our business and results of operations.

•We believe that the COVID-19 pandemic has had, and will likely continue to have, an impact on various aspects of our clinical programs and trials. For example, certain of our clinical trials were paused due to COVID-19. Patient dosing and study monitoring in these and other trials may be paused, delayed or temporarily halted (and clinical trial re-start schedules may be delayed beyond the dates we anticipated) due to changes in policies at various clinical sites and federal, state, local or foreign laws, rules and regulations, including quarantines or other travel restrictions, prioritization of healthcare resources toward pandemic efforts, including diminished attention of physicians serving as our clinical trial investigators and reduced availability of site staff supporting the conduct of our clinical trials, or other reasons related to the

COVID-19 pandemic. If the COVID-19 pandemic continues for an extended period of time, other aspects of our clinical trials may be adversely affected, delayed or interrupted, including, for example, site initiation, patient recruitment and enrollment, availability of clinical trial materials, and data analysis. Some patients and clinical investigators may not be able to comply with clinical trial protocols and patients may choose to withdraw from our studies, or we may choose to or be required to pause enrollment and/or patient dosing in our ongoing clinical trials in order to preserve health resources and protect trial participants. Any such disruption could negatively impact the results generated in the trial, the development of our pipeline programs and the timing and probability of paying milestones associated with prior acquisitions and active license agreements (which may lead to litigation over milestone payments).

•We currently utilize third parties to, among other things, manufacture our products and product candidates, supply raw materials and consumables, perform quality testing and provide supply chain services. We also manufacture certain of our products and product candidates and perform various services at our manufacturing facilities. If any of these processes or services are adversely impacted by the COVID-19 outbreak, our ability to manufacture and supply our products to patients or manufacture product candidates for our clinical trials and conduct our research and development operations may be materially affected. For example, if the U.S. government invokes the Defense Production Act, including as part of Operation Warp Speed, to redirect capacity at our third-party suppliers toward COVID-19 vaccine production or other pandemic relief efforts, it could delay manufacturing services by our suppliers and delay manufacture of our products and product candidates, negatively impact our ability to conduct clinical trials and maintain inventories of our products, any of which could have a material negative impact on our business and results of operations.

•The potential economic and financial impacts of the pandemic, including a deterioration in economic conditions that may negatively impact revenue and our liquidity, increase expenses and result in market capitalization declines, and disruption to our business, may result in the impairment of our long-lived and other assets, including goodwill, intangible assets and equity investments without readily

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determinable fair values. The impairment of significant assets could have a material impact on our deferred tax assets and liabilities. In addition, any impairment charge would have a negative impact on our financial results in the quarter that the charge is taken, and such charge may be material in amount.

•In accordance with business continuity plans and for the safety of our employees, we have directed most of our personnel to work remotely and we have generally restricted on-site staff to only those personnel and contractors who perform essential activities that must be completed on-site. Our increased reliance on personnel working from home may negatively impact productivity, or disrupt, delay, or otherwise adversely impact our business. In addition, this could increase our cyber-security risk, create data accessibility concerns, and make us more susceptible to communication disruptions, any of which could adversely impact our business operations.

•While our essential R&D employees have been able to access our laboratory space, if employees and contractors conducting such activities were exposed to or contracted COVID-19, we may be required to restrict access to our laboratory space for an extended period of time as a result. Governmental authorities may also impose restrictions limiting access to our lab space. As a result, this could delay timely completion of preclinical and other R&D activities.

•Health regulatory agencies globally may experience disruptions in their operations as a result of the COVID-19 pandemic. The FDA and other foreign regulatory agencies may have slower response times or be under-resourced to continue to authorize and monitor our clinical trials or review regulatory submissions (or authorize the use of facilities for manufacturing and related services) and, as a result, review, inspection, and other timelines may be materially delayed.

•In addition, a recession or other sustained adverse market event resulting from the spread of COVID-19 could materially and adversely affect our business, the value of our common shares and the availability of credit to operate our business and execute business development transactions. As a result, we may face difficulties raising capital (if needed) through sales of our common shares, accessing credit to support our business development activities or other capital initiatives or such sales of common

stock or credit may only be available on unfavorable terms.

•The trading prices for our common shares and other biopharmaceutical companies have been highly volatile as a result of the COVID-19 pandemic and we expect this volatility may continue.

COVID-19, and the volatile regional and global economic conditions stemming from the pandemic, could also precipitate or aggravate the other risk factors discussed in this Quarterly Report on Form 10-Q, which could materially adversely affect our business, financial condition, results of operations, liquidity, and stock price.

Risks Related to Pricing and Reimbursement

Sales of our products depend on reimbursement by payers and these payers are subject to pressures to contain costs.

Our commercial success depends on setting a price for our products that will enable us to obtain reimbursement at anticipated levels. Our products are significantly more expensive than traditional drug treatments and almost all patients require governmental payers and/or private third-party payers to pay all or a portion of the cost of our products. There is a significant trend in the health care industry by public and private payers to contain or reduce their costs, including by taking the following steps, among others: decreasing the portion of costs payers will cover, ceasing to provide adequate payment for certain products or not covering certain products at all. If payers implement any of the foregoing with respect to our products, it would have an adverse impact on our revenue and results of operations. We have, for example, recently experienced non-governmental payers removing our products from their formulary and, therefore, it was not available to certain beneficiaries.

Our ability to set the price for our products varies significantly from country to country, including in those countries where pricing, coverage, reimbursement or funding of prescription drugs are subject to governmental control. We may be unable to timely or successfully negotiate coverage, pricing and reimbursement on terms that are favorable to us (or at all), or such coverage, pricing and reimbursement may differ in separate regions in the same country. In some countries, the proposed pricing for a drug must be approved before it may be lawfully marketed, which could delay market entry (or, if pricing is not approved, we may be unable to sell at all in a country where we have received regulatory approval for a product). In addition, authorities in some countries impose additional obligations, such as health technology assessments (HTAs), which assess, among other things, how well a prescription drug works in relation

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to its cost. Additionally, U.S. payers are increasingly considering new metrics, including HTAs, as the basis for reimbursement rates. If our products do not meet or surpass these metrics, these payers may not reimburse the use of our products or may reduce the rate of reimbursement for our products and as a result, revenue from such products may decrease. We have voluntarily elected to reduce prices or establish price caps with payers for certain products, which we believe provides value in the long term (but decreases revenue per patient).

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 governmental controls on pharmaceutical pricing. Both the executive and legislative branches of the U.S. government have recently unveiled proposals to implement such controls. In late-2020, CMS issued an interim final rule to implement a Most Favored Nation (MFN) Model for certain included drugs and biological products payable under Medicare Part B. The MFN Model would gradually reduce Medicare Part B reimbursement for included products to their respective MFN price, which generally reflects the lowest price for a pharmaceutical product sold in certain economically-comparable member countries of the Organisation for Economic Co-operation and Development. SOLIRIS is one of 50 drugs and biological products included in the first performance year of the MFN Model. The MFN Model implementation was delayed as a result of certain litigation, but could have an impact on SOLIRIS revenue if implemented (for additional information on the MFN Model, see “Government Regulation – Pharmaceutical Pricing and Reimbursement” included in Part I, Item 1 of our Annual Report on Form 10-K for the year ended December 31, 2020). Among some of the additional proposals from the executive and legislative branches are: to allow Medicare to negotiate certain drug prices (and such prices would apply to the private market as well) (this measure was passed in the U.S. House of Representatives in late-2019), to move to a reimbursement regime that would establish pharmaceutical pricing by reference to a target price derived from the international price index, and to permit importation of medicines from other countries that have lower prices. Certain states have also proposed measures that are designed to control the costs of pharmaceuticals that they reimburse. If the U.S. (through the federal or state governments) were to move to a pricing system based on negotiated prices or to an international price index, such as the MFN Model (or similar model) that were to apply to our products, we expect that our revenues for sales in the U.S. would be lower, and potentially materially lower than if the current pricing program remained in place.

Other countries, including many European countries and Canada, have established pricing and reimbursement policies that contain costs by referencing the price of the same or similar products in other countries. In these instances, if coverage or the level of reimbursement is reduced, limited or eliminated in one or more countries, we may be unable to obtain or maintain anticipated pricing or reimbursement in other countries or in new markets. This may create the opportunity for third-party cross-border trade or influence our decision whether to sell a product, thus adversely affecting our geographic expansion plans and revenues. See Note 17, Commitments and Contingencies to the condensed consolidated financial statements for information about our lawsuit against the Patented Medicine Prices Review Board (PMPRB) to establish that Alexion did not excessively price SOLIRIS in Canada, which uses reference pricing.

Due to the cost of our therapies, any potential increase in the number of patients receiving our products may cause third-party payers to modify, limit or eliminate coverage or reimbursement for our products because they may require an allocation of a greater percentage of the potential financial resources of any public or private payer for our products.

Further, health insurance programs may utilize coverage incentives and obstacles to discourage beneficiaries from using higher priced products such as ours, including:

•establishing formularies under which only selected drugs are covered (which may exclude one or more of our products);

•utilizing variable co-payments that make drugs that are not preferred by the payer more expensive for patients; and

•utilizing management controls, such as requirements for prior authorization or failure first on another treatment.

In countries where patients have access to insurance, their insurance co-payment amounts or other benefit limits may represent a barrier to obtaining or continuing use of our products or adoption of new treatment options, such as ULTOMIRIS. The imposition or continuation of the use of these types of limits or barriers by insurers or the imposition of similar limitations or barriers in the future may have an adverse impact on our revenue and results of operations. In some cases, we have financially supported non-profit organizations that assist patients in accessing treatments, consistent with applicable laws, regulations, and government guidance. Such organizations assist patients whose insurance coverage imposes high co-payment amounts or other expensive financial obligations. Such organizations’ ability to provide assistance to

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patients is dependent on funding from external sources, and we cannot guarantee that such funding will be provided at adequate levels, if at all. We have also provided our products without charge to patients who have no or limited insurance coverage for drugs through related charitable purposes, consistent with applicable laws, regulations, and government guidance. We are not able to predict the financial impact of the support we may provide for these and other charitable purposes; however, substantial support could have a material adverse effect on our profitability in the future.

As third-party payers attempt to contain health care costs, they are demanding price discounts or rebates and limiting both the types and variety of drugs that they may cover and the amounts that they will pay for drugs. As a result, they may not cover or provide adequate payment to patients for our products or they may demand discounts or rebates from us, which may be material.

In 2020, three customers accounted for 47.4% of our total revenues. If any one or more of these customers were to require significant discounts or rebates, or were to discontinue purchasing our products (due to cost or otherwise), our results of operations may be materially and adversely impacted.

Risks Related to Intellectual Property

If we cannot obtain new patents, maintain our existing patents and protect the confidentiality and proprietary nature of our trade secrets and other intellectual property, our business and competitive position may be harmed.

Our success depends in part on our ability to obtain and maintain patent and regulatory protections for our products and investigational compounds, to preserve our trade secrets and other proprietary rights and to prevent third parties from infringing on our rights.

We have procured patent rights, through both ownership and license, that cover our products and investigational compounds, and will likely apply for additional patent protections in the future. However, our patent applications may not result in the issuance of patents in the U.S. or other countries. In addition, a patent may be issued in one country, but a counterpart patent may not be issued in another country. For example, the European Patent Office in September 2019 rejected a patent application relating to the composition of matter for SOLIRIS; related patents were granted in the U.S. and Japan.

Even if a patent is issued, that is not conclusive as to its inventorship, scope, validity or enforceability and therefore that patent may not afford adequate (or any) protection for our products. On the basis of such inconclusiveness, third parties may challenge our patents, have done so in the past and, in some

cases, have been successful in such challenges. For example, on January 21, 2019, the Opposition Division of the European Patent Office determined, following multi-party opposition proceedings, to revoke one of our European patents that relates to the formulation of SOLIRIS. Further, on August 30, 2019, the U.S. Patent and Trademark Office instituted inter partes review (IPR) of three of our patents that relate to SOLIRIS. In May 2020, we entered into a Confidential Settlement and License Agreement with Amgen to settle the three IPRs (Settlement Agreement). Pursuant to the Settlement Agreement, Alexion and Amgen have terminated each of the pending IPRs and, effective March 1, 2025 (or an earlier date in certain circumstances), Alexion grants to Amgen (and its affiliates and certain partners) a non-exclusive, royalty-free, license under U.S. patents and patent applications related to eculizumab and various aspects of the eculizumab product that Alexion currently markets and sells under the tradename SOLIRIS. We may enter into similar agreements in the future to grant or clarify certain rights of third-parties in connection with our intellectual property rights in SOLIRIS or other products or product candidates. In addition, under the settlement agreement with Amgen, if certain circumstances are satisfied, Amgen may have the right to market and sell an eculizumab product in the U.S. prior to March 2025.

If any of our patents are narrowed, invalidated, revoked or become unenforceable, competitors may develop and market products similar to ours that do not conflict with or infringe our patents rights, which could have a material adverse effect on our financial condition. Even if we obtain and maintain patents, our business may be significantly harmed if the patents are not broad enough to protect our products from copycat products. In addition, we may in the future enter into agreements similar to the agreement with Amgen that provides certain intellectual property rights to our marketed products or products in our pipeline.

We may finance or collaborate in research and development projects conducted by third parties, including government organizations, hospitals, universities or other educational or research institutions, or other for-profit companies. Such third parties may be unwilling to grant us certain rights to technology or products developed through such projects. Disputes may also arise as to the rights to technology or products developed in collaboration with such third parties.

Significant legal questions exist concerning the extent and scope of patent protection for biopharmaceutical products and processes in the U.S. and elsewhere. Accordingly, there is no certainty that patent applications owned or licensed by us will issue

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as patents, or that our issued patents will afford meaningful protection against competitors. Once issued, patents are subject to challenge through both administrative and judicial proceedings in the U.S. and other countries. Such proceedings include re-examinations, inter partes reviews, post-grant reviews and interference proceedings before the U.S. Patent and Trademark Office, as well as opposition proceedings before the European Patent Office and other non-U.S. patent offices. Certain countries have laws that provide stronger bases for challenging third party patent rights than are available to challenge patents in other countries. Therefore, we may be able to defend our patents against a third-party claim in one country but counterpart patents may be invalidated in other countries and we may be able to invalidate a third-party patent in one country but not invalidate its counterpart patents in other countries. Litigation may be required to enforce, defend or obtain our patent and other intellectual property rights. Any administrative proceeding or litigation could require a significant commitment of our resources and, depending on outcome, could adversely affect the scope, validity or enforceability of certain of our patent or other proprietary rights.

Some of the sensitive technology, techniques and proprietary compounds used in our business are protected as trade secrets. However, we may also rely on collaboration with, or discuss the potential for collaboration with, suppliers, outside scientists and other biopharmaceutical companies. Collaboration and discussion of potential collaboration or inadvertent disclosure of a trade secret present a strong risk of exposing our trade secrets. If our trade secrets were exposed, we may lose the protection and potential exclusive rights afforded by trade secret law, and such exposure may likely help our competitors and allow them to access technology without restriction and adversely affect our business prospects.

If we are found to be infringing third party patents, we may be forced to pay damages to the patent owner and/or obtain a license to continue the manufacture, sale or development of our products. If we cannot obtain a license, we may be prevented from the manufacture, sale or development of our products or product candidates, which may adversely affect our business.

Parts of our technology, techniques, proprietary compounds and potential product candidates, including those which are or may be in-licensed or developed in collaboration with third parties, may be found to infringe patents owned by or granted to others. We have, and may in the future, receive notices claiming our products infringe third party patents and third parties have and may in the future file civil lawsuits against us claiming infringement of their intellectual property rights. Chugai

Pharmaceutical Co., Ltd. filed suits in the U.S. and Japan alleging that ULTOMIRIS infringes patents held by Chugai. See Note 17, Commitments and Contingencies to the footnotes to the condensed consolidated financial statements. Additional third parties may claim that the manufacture, use or sale of our products or product candidates infringes patents owned or granted to such third parties. We are aware of patents owned by third parties that might be claimed by such third parties to be infringed by the development and commercialization of our products or investigational compounds. In respect to some of these we have invalidated the patents, obtained licenses, or expect to obtain licenses. However, with regard to others we have determined in our judgment that:

•our products and investigational compounds do not infringe the patents;

•the patents are not valid or enforceable; and/or

•we have identified and are testing various alternatives that should not infringe the patents and which should permit continued development and commercialization of our products and investigational compounds.

Any holder of these patents or other patents covering similar technology could sue us for damages, which may be material in amount, and seek to prevent us from manufacturing, selling or developing our products (and we may be, in certain cases, prevented from initiating product launches in certain jurisdictions or required to withdraw the product from the market after it has been launched). Intellectual property disputes, such as those initiated by Chugai, can be costly and time consuming to defend and there is no guarantee that we would prevail in such lawsuit. If we cannot successfully defend against any infringement claims, we may seek to invalidate the patent or seek a license to the technology prior to or during legal actions in order to reduce the risks in connection with the product launches (or at a later time after product introduction) and to reduce further costs and the risk of a court determination that our technology, techniques, proprietary compounds or potential product candidates infringe the third party’s patents. A required license may be costly or may not be available on acceptable terms, if at all. A costly license, or inability to obtain a necessary license, could have a material adverse effect on our business.

In some instances, we believe we may prevail in a patent infringement action. There can, however, be no assurance that the court will agree with our position or that it will decide any infringement case in our favor. Nor can we be certain that, if we do not prevail in litigation, that we may be able to obtain a license to any third-party patent on commercially

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reasonable terms (or at all); successfully develop non-infringing alternatives on a timely basis (or at all); or license alternative non-infringing technology, if any exists, on commercially reasonable terms (or at all). Any impediment to our ability to manufacture, use or sell approved forms of our products or our product candidates could have a material adverse effect on our business and prospects.

It is possible that we could lose market exclusivity for a product earlier than expected, which may harm our competitive position.

In our industry, much of an innovative product’s commercial value is realized while it has market exclusivity.

Market exclusivity for our products depends in large part on patent rights and certain regulatory forms of protection. As noted above, patent protection can be uncertain as to the validity, scope and enforceability of many issued patents. Absent relevant patent protection for a product, once regulatory exclusivity periods expire, biosimilar or generic versions of the product can be approved and marketed. For example, in 2019, a SOLIRIS biosimilar was approved in Russia for the treatment of patients with PNH and aHUS. We also believe that the manufacturer of a SOLIRIS biosimilar has commenced the process to obtain regulatory approval to market and sell a SOLIRIS biosimilar in Brazil and Turkey and, if approved, this biosimilar may compete with SOLIRIS in Brazil and Turkey.

The market exclusivity of our products may be impacted by competitive products that are either innovative, biosimilar or generic copies. In our industry, the risk of biosimilar or generic challenges has been increasing. U.S. law includes an approval pathway for biosimilar versions of innovative biological products. Under the pathway, the FDA may approve products that are similar to (but not generic copies of) innovative biologics (SOLIRIS, ULTOMIRIS and ANDEXXA are each innovative biologics) on the basis of less extensive data than is required for a full biologic license application (and there are similar pathways for generic copies of small molecule therapies (the Factor D therapies (ALXN2040 and ALXN2050) acquired in connection with the Achillion transaction are, for example, small molecules)). The law provides a mechanism to challenge the patents that protect an innovator’s products. Such litigation may begin as early as four years after the innovative biological product is first approved by the FDA. Pathways for biosimilar products also exist in many other markets, including Europe, Japan and Russia. Other companies are developing and advancing SOLIRIS biosimilar programs, including conducting clinical trials. Competition, including from biosimilars approved for marketing, would likely result in a decrease in volume of sales of our products, as well

as a decrease in prices and lower margins for our products. In addition, approval of a biosimilar that is a substitute for one of our products may increase the risk of accelerated market penetration by that biosimilar. Further, if patients or healthcare providers do not believe that ULTOMIRIS provides a compelling profile for patient conversion from SOLIRIS, a SOLIRIS biosimilar may not only be expected to have a material and negative impact on our SOLIRIS revenues and margins (which accounted for a significant percentage of our revenue in 2020), it may also have a material impact on ULTOMIRIS revenue and margins and the ability of ULTOMIRIS to gain market acceptance.

Our other products and product candidates in development and trials are also at risk from biosimilars and generic drugs. Other than SOLIRIS for the treatment of gMG and NMOSD and SOLIRIS and ULTOMIRIS as a treatment for PNH and aHUS, each of our products is currently the only approved drug for the disease(s) the product treats. If a competitive product is approved for sale, including a biosimilar or generic product or other therapy (such as the two non-C5 therapies approved by certain regulatory authorities, including the FDA, as a treatment for NMOSD), our market share and our revenues could decline, particularly if the competitive product is perceived to be more effective or is less expensive than our product.

Risks Related to Our Products and Product Candidates

Our future commercial success depends on gaining regulatory approval for new products and obtaining approvals for existing products for new indications.

We invest significant amounts in acquiring new products and technologies and advancing our existing product candidates and technologies. Our success and revenue growth and diversification will depend in part on our identification, acquisition (including licenses from or collaborations with third parties), development and commercialization of new products and technologies, and approval of additional indications for our existing products and products under development. Product development is very expensive, takes significant time and involves a high degree of risk. Only a small number of research and development programs result in the commercialization of a product. For example, we recently paused enrollment in our ULTOMIRIS trial for certain COVID-19 patients due to lack of efficacy and in 2020 we terminated our agreement to co-develop ABY-039 with Affibody and determined not to exercise the co-development option agreement with Stealth BioTherapeutics Corp., in each case due to results of clinical trials. In addition, our recent investment and acquisition activities focused on new technologies with which we have limited experience, including a Factor Xa reversal agent and antibody therapeutics

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targeting the neonatal Fc receptor, which may make the development, approval and commercialization of such potential products challenging for us.

Our ability to maintain or grow and diversify revenues may be adversely affected if we are delayed or unable to successfully develop the products in our pipeline, if we are unable to gain approval for SOLIRIS and ULTOMIRIS for additional indications, for new routes of administration (subcutaneous delivery) and in new jurisdictions, obtain marketing approval for STRENSIQ, KANUMA and ANDEXXA in additional territories, obtain approval for different dosing regimens (or expansion of indications included in the product label) or acquire or license products and technologies from third parties.

Even if we are successful in developing new products or addressing new indications, we cannot market any of those products unless and until we obtain all required regulatory approvals in each jurisdiction where we plan to sell these therapies. We must also maintain all such regulatory approvals for the period of time that we sell the product in each such jurisdiction. Our failure to obtain, or a delay in obtaining, approval or if we fail to maintain approvals once obtained, will prevent us from selling products and generating revenues for those products in such jurisdiction where we do not hold such approvals.

Our products and product candidates target diseases and conditions with small patient populations and we may not be effective at identifying patients.

The therapies that we have developed, acquired and that are in our product pipeline and in preclinical development target diseases and conditions that have small patient populations that have not been definitively determined. Further, in many cases there are either no or limited diagnostic tools for the indications we treat or may treat in the future. The lack of diagnostic tools, coupled with the fact that there is frequently limited awareness among certain health care providers concerning the rare diseases we treat, often means that a proper diagnosis can, and frequently does, take years to identify (or an appropriate diagnosis may never be made for certain patients). As a result, we may not be able to grow our revenues (even as we introduce new products or as existing products are approved for additional indications). There can be no guarantee that any of our programs will be effective at identifying patients that will benefit from our therapies, and even if we can identify patients that our therapies can help, the number of patients that our therapies treat may turn out to be lower than we expect, they may not be otherwise amenable to treatment with our products, or new patients may become increasingly difficult to identify, all of which may adversely affect our ability to grow and diversify revenue and adversely affect our results of operations and our business. In addition,

even in instances where we do add patients, the number may be less than the number of patients that discontinue use of the applicable product in a given period resulting in a net loss of patients and potentially decreased revenue.

We may not be able to gain or maintain market acceptance of our products among the medical community, patients or payers, which could prevent us from maintaining profitability or growth.

Our products may not gain or maintain market acceptance among physicians, patients, payers and others. Although we have received regulatory approval for certain of our products in certain territories (and may receive approvals for additional products or in additional jurisdictions), such approvals do not guarantee future revenue. Physicians’ willingness to prescribe, and patients’ willingness to accept, our products, depends on many factors, including:

•prevalence and severity of adverse side effects in both clinical trials and commercial use;

•the timing of the market introduction of competitive drugs, biosimilars and generics;

•perceived safety of our products;

•demonstrated clinical safety and efficacy compared to other drugs;

•perceived benefits relative to cost and/ or evaluations in HTAs (or similar assessments);

•pricing and availability of reimbursement from third-party payers, including governmental entities;

•convenience and ease of administration;

•effectiveness of our marketing strategy;

•publicity concerning our products and our other product candidates (and those of competitive products); and

•availability of alternative treatments.

The likelihood of physicians to prescribe SOLIRIS and ULTOMIRIS for patients who present in acute treatment settings may depend on how quickly SOLIRIS or ULTOMIRIS can be delivered to the hospital or clinic, and our distribution methods may not be sufficient to satisfy this need. In addition, while SOLIRIS as a treatment for aHUS is recommended by some regulatory authorities to be used for the duration of a patient’s lifetime, we are aware that some healthcare providers prescribe SOLIRIS for aHUS for a shorter time period and, in some cases, may prescribe SOLIRIS for aHUS in emergency or acute situations only (and the same may occur in connection with the use of ULTOMIRIS for aHUS). Decisions such as this by aHUS patients and healthcare providers to use our products for a period

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that is less than the remaining lifetime of the patient or in only acute circumstances may cause our SOLIRIS or ULTOMIRIS revenues, and revenues for our other products, to fluctuate and past sales of our products may not be indicative of future sales for such products.

If our products fail to achieve or maintain market acceptance among the medical community or patients in a particular country, we may not be able to market and sell our products successfully in such country, which may limit our ability to generate revenue and could harm our overall business.

If our products harm patients, or are perceived to harm patients even when such harm is unrelated to our products, our regulatory approvals could be revoked or otherwise negatively impacted and we could be subject to costly and damaging product liability claims.

The testing, manufacturing, marketing and sale of biologics and small molecule therapies for use in humans may cause harm to patients, which exposes us to product liability risks and regulatory penalties.

Our products and our product candidates generally treat patients with rare diseases and, as a result, we generally are able to test our products in only a small number of patients. As more patients use our products, including more children and adolescents, new risks and side effects may be discovered, the rate of known risks or side effects may increase, and risks previously viewed as less significant could be determined to be significant.

Under pharmacovigilance guidelines, we are required to timely report any adverse events that any patient using our products experiences, as well as any clinical evaluations of outcomes in the post-marketing setting. This information is required to be reported to appropriate regulatory agencies in accordance with relevant regulations and, as a result, any potential adverse events will be promptly brought to the attention of regulators that may likely require prompt remedial action (and any failure to report these adverse events or report such events in a timely manner may result in penalties being imposed on Alexion by regulators). In the event any new risks or adverse effects are discovered as patients are treated for approved indications, or as our products are studied in or used by patients for other indications, regulatory authorities may delay or revoke their approvals or require changes to labeling or reformulation of the products (or take other actions that may adversely impact sales of such products).

If previously unknown side effects are discovered or if there is an increase in negative publicity regarding known side effects of any of our products, it could significantly reduce demand for the product, harm our reputation, result in product withdrawals, recalls, delays or revocations of regulatory approvals

or require us to take actions that could negatively affect sales and operating results, including conducting additional clinical trials and safety studies, making changes in labeling, reformulating our products or making changes and obtaining new approvals for our and our suppliers’ manufacturing facilities. Further, any investigation into the circumstances surrounding an adverse event may be costly and time consuming (even if it is ultimately determined that the adverse event is not the result of the use of our product).

There are also risks associated with our products; for example, use of C5 Inhibitors, such as SOLIRIS and ULTOMIRIS, is associated with an increased risk for certain types of infection, including meningococcal infection. In certain cases, a physician may not have the opportunity to timely vaccinate a patient, especially for those patients that present in acute treatment settings, which could result in the patient using SOLIRIS or ULTOMIRIS experiencing a life-threatening meningococcal infection (and even in certain cases in which a vaccination can be delivered to the patient, it may not eliminate all risk of meningococcal infection). In addition, ANDEXXA has been associated with thrombolic risks, ischemic risks, cardiac arrest and sudden death. Patients using our products and product candidates have died or suffered potentially life-threatening conditions either during or after ending their treatments, and these include patients who have died while participating in a clinical trial. In addition, many patients who use our products are already very ill and may suffer adverse events, including death, for reasons that may or may not be related to our products. We may be sued by patients who are harmed during the course of using our products, whether as a prescribed therapy, during a clinical trial, during an investigator-initiated study, or otherwise. Any such product liability lawsuit or injury claim, which could include class actions, could harm our reputation among patients, physicians, payers and others and require us to pay substantial amounts of money to injured patients, and even if successfully defended, could have a material adverse effect on our business, financial condition or results of operations due to the expense of defending any such claim. While we do have product liability insurance, it may not cover all potential types of liabilities or may not cover certain liabilities completely. Moreover, we may not be able to maintain our insurance on acceptable terms, or at all.

We anticipate that we will face increased competition from companies that will enter into the markets we currently serve and as our product pipeline expands into markets that are currently served by other companies.

We expect that the business environment in which we operate will become increasingly

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competitive. Currently, certain of our products are the only approved therapies for certain indications they treat. For example, SOLIRIS and ULTOMIRIS are the only approved treatments for PNH and aHUS in the U.S., Europe and Japan. We expect that SOLIRIS and ULTOMIRIS may compete with new drugs and biosimilars currently in development. Several companies are developing other therapies to treat PNH, aHUS, gMG and NMOSD, and other pharmaceutical companies have publicly stated that they are developing and intend to commercialize a SOLIRIS biosimilar.

In 2020, the FDA and certain other foreign regulatory authorities have approved therapies developed by third parties for the treatment of NMOSD in adult patients who are anti-aquaporin-4 antibody positive. The introduction of these and other competitive products may negatively impact our business, including our revenue and profitability. In addition, following the introduction of a SOLIRIS biosimilar in 2019 in Russia for the treatment of PNH and aHUS, we experienced a decrease in revenue from sales of SOLIRIS and expect that Russia will account for a minor portion, if any, of future SOLIRIS revenue as a result of this competitive product. We also believe that the manufacturer of a SOLIRIS biosimilar has commenced the process to obtain regulatory approval to market and sell a SOLIRIS biosimilar in Brazil and Turkey and, if approved, this biosimilar may compete with SOLIRIS in Brazil and Turkey and, like Russia, have an adverse impact on SOLIRIS revenues in Brazil and Turkey. STRENSIQ, KANUMA and ANDEXXA may also experience competition in the future. We are also aware of companies that have initiated or are planning to initiate studies for diseases and conditions that we are also targeting with our product pipeline. Our revenues could be negatively affected if patients or potential patients enroll in our clinical trials or clinical trials of other companies with respect to diseases and conditions that we also target with approved therapies.

Some of our competitors and future competitors may have significantly greater financial, technical and marketing resources than us and may commercialize competitive products that are cheaper, more effective, safer, have less frequent dosing schedules, or are easier and quicker to administer than our products. Our current and future competitors may develop products that are more broadly accepted or may receive patent protection that dominates, blocks or adversely affects our product development or business. These competitive products, including any biosimilars approved under alternative regulatory pathways (or generics that may be approved that compete with our small molecule therapies), may significantly reduce both the price that we receive for our marketed products and the volume of products

that we sell, which may negatively impact our revenues and profitability. Given that a significant portion of our 2020 revenue was attributable to SOLIRIS, one or more competitive novel products or biosimilars could have a significant impact on our entire business.

In addition, we experience competition in drug development from universities and other research institutions, and pharmaceutical companies compete with us to attract universities and academic research institutions as drug development partners, including for licensing their proprietary technology. If our competitors successfully enter into such arrangements with academic institutions, we may be precluded from pursuing those unique opportunities and may not be able to find equivalent opportunities elsewhere.

If a company announces successful clinical trial results for a product that may be competitive with one of our products or product candidates, receives marketing approval of a competitive product, or gets to the market before we do with a competitive product, our business may be harmed or our stock price may decline.

Risks Related to Business Operations

We rely on a limited number of facilities to produce our products and manufacturing issues at our facilities or the facilities of our third party service providers could cause product shortages, stop or delay commercialization of our products, disrupt or delay our clinical trials or regulatory approvals, and adversely affect our business.

The majority of our products and product candidates are biologics and the production of such biologic therapeutics that meet all product specification and regulatory requirements is particularly complex. Even slight deviations at any point in the production process may lead to production failures, product recalls and regulatory actions. In addition, because the production process involves the use of materials that are derived from biological sources, the process can be affected by contaminants that could impact those biological micro-organisms. These manufacturing challenges are coupled with the fact that we have limited experience manufacturing commercial quantities of certain of our products (so we or our third party manufacturers may have limited previous experience resolving any issues in connection with the manufacture of certain of our products and any issues may take significant time to remediate or we may be unable to solve any manufacturing problems). In addition, with our acquisition of Achillion, we also have small molecules in clinical trials and we are planning future clinical trials in new indications and we expect that manufacture of these therapies and compliance with cGMP will pose similar challenges and we have limited

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experience manufacturing small molecules for clinical trials and for commercial sales.

If we and/or our third party manufacturers (including those involved in drug substance, drug product, and finished product) and other suppliers fail to meet the highly technical requirements/specifications of manufacturing our biologic and small molecule products and our strict quality and control specifications, we (or they) may be unable to manufacture or supply our products. We depend on our third party manufacturers to perform effectively on a timely basis and to comply with regulatory requirements and meet our product specifications. For example, we rely on Lonza owned and operated facilities for the production of a significant portion of our products, including ANDEXXA which we recently acquired, and Lonza has undertaken the construction and operation of new facilities to meet demand for certain of our products (including a new facility in New Hampshire that was qualified for manufacturing in 2020) and these facilities must meet our production requirements and new facilities must be qualified by regulatory authorities before product can be sold. Our failure or the failure of our third-party manufacturers (including the Lonza facilities that manufacture certain of our products) to produce sufficient quantities of our products and product candidates or to meet our specifications and quality standards or those standards imposed by regulatory authorities could result in lost revenue, diminish our profitability, delay the development of our product candidates, delay regulatory approval, result in the rejection of our product candidates or result in supply shortages for our patients, which may lead to lawsuits, harm to our reputation or could accelerate introduction of competing products to the market. For example, we experienced unexpected chemistry, manufacturing and control (or CMC) issues with our ALXN 1830 program that resulted in a delay in the clinical trial timeline for that program. We may experience similar CMC issues in the future that may impact marketed products or other clinical trials.

If we underestimate demand for ULTOMIRIS, SOLIRIS, ANDEXXA or any of our products, or experience product interruptions at Alexion’s internal manufacturing facilities or a facility of a third party provider, including as a result of risks and uncertainties described in this Quarterly Report on Form 10-Q, we may not be able to increase our revenues and alternative therapies may gain greater market acceptance.

We also face external factors, many of which are beyond our control, that could cause production interruptions at our facilities or at the facilities of our third party providers, including natural disasters, public health crises (such as COVID-19), labor disputes, acts of terrorism or war.

The risks to our business of any manufacturing stops or interruptions (whether the result of internal or external factors of the nature identified above) are amplified because we rely on a limited number of facilities to produce our products and product candidates. Further, we expect that we will continue to rely on a very limited number of manufacturing facilities in the future for all of our products, including our complement inhibitors. Although we have business continuity plans, including with respect to inventory, to reduce the potential for manufacturing disruptions or delays and reduce the severity of a disruptive event, there is no guarantee that these plans will be adequate, which could adversely affect our business and operations.

We and our third party suppliers and providers are required to maintain compliance with cGMP and other stringent operation and manufacturing requirements and are subject to inspections by the FDA and comparable agencies in other jurisdictions to confirm such compliance. Governmental authorities will generally not permit products manufactured at a facility that is not registered by the applicable government agency to enter into that country and such products may be returned for failure to comply with such regulation, which may decrease or delay sales and result in the loss of inventory. Any delay, interruption or other issues that arise in the manufacture, in connection with drug substance, drug product, finished product, fill-finish, packaging or storage of our products as a result of a failure of our facilities or the facilities or operations of third parties to pass any regulatory agency inspection or comply with ongoing operating regulations could significantly impair our ability to supply our products and product candidates. Significant noncompliance could also result in the imposition of monetary penalties or other civil or criminal sanctions and damage our reputation.

Our efforts to bring more of our manufacturing operations under our control present additional risks. We have made significant investments in biologics manufacturing facilities, warehousing, fill-finish and other facilities at our sites in Athlone and Dublin, Ireland and at dedicated sites owned by third parties, including a Lonza facility in New Hampshire. We commenced manufacturing operations at certain of these sites prior to receiving regulatory approval and we have $86.1 of product produced at such sites in inventory as of March 31, 2021. Despite the significant investment we have made in these facilities and operations, we cannot guarantee that we will be able to successfully and timely complete the appropriate validation processes or obtain the necessary regulatory approvals for these and other facilities, that we will be able to perform the intended manufacturing and supply chain services at these facilities for commercial or clinical use or that we will be able to use the product manufactured at these

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sites. Prior to such time, we may continue to rely on third parties for these services.

If our products are subject to any manufacturing issues or we lose manufacturing slots due to Operation Warp Speed, we may be unable to timely identify alternative manufacturers, and if we are able to timely identify alternative manufacturers, such alternative manufactures may not be able to satisfy our requirements. No guarantee can be made that regulators will approve additional third party providers in a timely manner or at all, or that any third party providers will be able to perform manufacturing or related services for sufficient product volumes for any country or territory. Further, due to the nature of the current market for third-party commercial manufacturing, many arrangements require substantial penalty payments by the customer for failure to use the manufacturing capacity for which it contracted. The payment of a substantial penalty could harm our financial condition and may restrict our ability to transition to internal manufacturing or manufacturing by other third parties. In addition, the terms and conditions to engage an additional third-party manufacturer may not be as favorable to us as our current arrangements and may likely reduce the profit on the sales of any products to which they relate. Further, transfer of production operations to a new supplier is time-consuming and new manufacturing will take significant time before the product can be sold commercially.

Any adverse developments affecting our manufacturing operations or the operations of our third-party providers could result in a product shortage of clinical or commercial requirements, withdrawal of our product candidates or any approved products, shipment delays, lot failures or recalls. We may also have to write-off inventory and incur other charges and expenses for products that fail to meet specifications, undertake costly remediation efforts or seek more costly manufacturing alternatives. Each of these could have an adverse material impact on our business individually or in the aggregate.

We rely on a limited number of providers for our raw materials and supply chain services, which could result in our being unable to continue to successfully commercialize our products and our product candidates (if approved) and to advance our clinical pipeline.

Certain of the raw materials required in the manufacture and the formulation of our products are derived from biological sources. Such raw materials are difficult to procure and may be subject to contamination or recall. Access to and supply of sufficient quantities of raw materials which meet the technical specifications for the production process is challenging, and often limited to single-source suppliers. If a raw material manufacturer were unable

to supply such materials, our business may be impacted because we rely on one or a limited number of such manufacturers for certain materials for our products, including the limited third-parties we rely on to operate our master cell banks. Finding an alternative supplier could take a significant amount of time and involve significant expense due to the nature of the products and the need to obtain regulatory approvals. The failure of these single-source suppliers to supply adequate quantities of raw materials for the production process in a timely manner, or at all, may impact our ability to produce sufficient quantities of our products for clinical or commercial requirements. A material shortage, delay, contamination, recall, or restriction on the use of certain biologically derived substances or any raw material used in the manufacture of our products could adversely impact or disrupt manufacturing and materially limit our ability to generate revenues.

In addition, KANUMA is a transgenic product and the facilities on which we rely to produce raw material for KANUMA are the only animal facilities in the world that produce the necessary egg whites from transgenic chickens. Natural disasters, disease, such as exotic Newcastle disease or avian influenza, or other catastrophic events could have a significant impact on the supply of unpurified KANUMA, or destroy our animal operations altogether. If our animal operations are disrupted, it may be extremely difficult to set up another animal facility to supply the unpurified KANUMA.

We also depend on a very limited number of third party providers for supply chain services with respect to our clinical and commercial product requirements, including product filling, finishing, packaging and labeling.

Our third-party raw material providers and supply chain service providers operate as independent entities and we do not exercise control over any such third-party provider’s operations or their compliance with our internal or external specifications or the rules and regulations of regulatory agencies. Any contractual remedies we may have under agreements with these parties may not protect us from the harm suffered by our business or our patients if they fail to provide material or perform services that meet our specifications. Due to the highly specialized nature of the services performed by these third parties, particularly the supply of raw materials and other drug supply and drug product, as well as the delivery and supply chain operations regarding our products, we do not believe that we could quickly find replacement suppliers or service providers and, even if we were able to identify additional third parties, the terms of any such arrangement may not be favorable to us. In either of these cases, our revenue, results of operations, business and reputation may be harmed

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and we may not be able to provide the therapies that our patients require.

The success of our business may also depend on the security of our products while in the supply chain for delivery to patients, which, as noted above, is dependent on third-party providers. For example, if our products are not fully and adequately secured from unauthorized access by third parties, any of our products may be tampered with or contaminated. If our products were exposed to any tampering or contamination, or if they are not transported in accordance with the required specifications, our patients may be harmed through use of our products, and such harm may be severe. In addition, if the supply chain is not secure (or our distributors do not exercise control over our products while in their possession), we are also at risk for our products being diverted to patients other than those who are the intended recipient or to patients who do not have a prescription to receive our therapies (or it may be used for treatment by physicians who have not completed the necessary REMs protocols in order to treat patients) or it may be sold by distributors, channels or other entities that are not authorized by Alexion to sell our products. In addition, an unauthorized distributor may not properly store or ship our products, thereby exposing patients to potential harm from use of the product that was not handled in accordance with our standards. If any of the foregoing were to happen, we could be subject to costly litigation, significant monetary penalties, harm to our reputation and investigation by regulatory authorities (and potentially subject to regulatory action, including recall, product withdrawals, suspensions and monetary penalties).

The sale and use of counterfeit versions of our products could result in significant harm to patients, reduced sales of our products and harm to our reputation.

We are aware that counterfeit versions of our products have been sold by entities that are not affiliated with Alexion using product packaging suggesting that the product was manufactured by Alexion. If unauthorized third parties illegally distribute and sell counterfeit versions of our products, those products may not meet our very stringent product specifications (or the manufacturing, handling and distribution requirements for our products) and any patient that takes any counterfeit product may suffer serious adverse health consequences, including death. Our reputation and business could suffer harm as a result of counterfeit drugs sold under our brand name and could result in lost sales for us and decreased revenues.

If we are unable to establish and maintain effective sales, marketing and distribution capabilities or to enter into agreements with third parties to do so, we

may be unable to successfully commercialize our products.

We currently market and sell our products in the U.S., the EU, Japan and several other territories through a direct sales force. In addition, in order to gain greater efficiencies in our operations, certain portions of our international commercial operations, including sales, distribution, marketing and related efforts in designated countries are conducted by third-parties.

Due to the fact that some of our products are new to the market, we do not have lengthy experience in marketing and selling these products to patients, healthcare providers and payers (for example, we are relatively new to certain therapeutic areas, such as neurology (gMG and NMOSD)). In addition, ANDEXXA is also new to the market, having been authorized by the FDA to be marketed in the US in mid-2018. This challenge is coupled with the fact that many members of our sales and marketing team are new to working with Alexion products (and ANDEXXA) and we rely on third parties to market, distribute and sell our product in certain countries. The success of our re-launch of ANDEXXA will depend on our success in marketing the product and being able to execute on the sales strategy which will focus on issues such as pricing, removing access barriers and dosing to ensure appropriate use (and this launch strategy is different than that adopted by Portola prior to the acquisition). If we and our third parties are unable to successfully market and sell our new products (and expand our sales and commercial operations) and to successfully sell our products in new therapeutic areas, our business and sales may be harmed. We cannot guarantee that we will be able to establish, maintain and expand our own capabilities or maintain any sales, marketing or distribution agreements with third-party providers on acceptable terms, if at all, or that we will be able to continue to manage the transition to third-party sales, marketing and distribution in the relevant jurisdictions that will not cause any interruption or disruption in our business and sales of our products. We will not exercise the same degree of control over such third parties that we do over our direct sales force and the ability to direct the third party and provide incentives for such third party to market and sell our products may not be as strong as in the case of a direct sales force. As we move to new third party sales force, marketers and distributors in certain countries it may also increase the risk of litigation with or liability to third parties that we had previously engaged to perform services for us in jurisdictions where we are implementing these operational changes (and we have been subject to certain such claims in the past).

Even if we hire qualified sales and marketing personnel necessary to support our objectives and

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enter into distribution agreements with third parties on acceptable terms, we may not hire such employees or enter into such agreements in an efficient manner or on a timely basis. We may not be able to forecast accurately the size and experience of the sales and marketing force and the scale of distribution capabilities necessary to successfully market and sell our products, which could result in decreased revenues or margins. In addition, as we launch new products, such as ULTOMIRIS (and re-launch ANDEXXA), and we move into other therapeutic areas (such as neurology and reversal of Factor Xa inhibitors), and, if and when, the products we acquire in connection with acquisitions and development agreements with third parties move closer to regulatory approval, we may have a larger product portfolio and address more therapeutic areas and the foregoing risks may continue to apply and may increase. Our expenses associated with building up and maintaining the sales force and distribution capabilities around the world, and relying on third party sales, marketing and distribution, may be disproportionate compared to the revenues we may be able to generate on sales or any savings or efficiencies we gain through use of such third-parties. We cannot guarantee that we will be successful in commercializing any of our products for the above referenced or other reasons.

Our efforts to expand our business and product offerings through acquisitions of businesses and technologies may not be successful.

Building our product pipeline is a key strategic objective to address revenue concentration risk in C5 complement inhibitors and we may, from time to time, evaluate and, when appropriate and in accordance with our obligations under the Merger Agreement with AstraZeneca, purchase businesses and acquire, co-develop or license technologies and products from third parties in an effort to expand and diversify our pipeline, product offerings, and our technologies. For example, in 2020 we acquired Portola and Achillion. Acquisitions of new businesses or products and in-licensing of new technologies and products may involve numerous risks, including:

•substantial cash expenditures;

•potentially dilutive issuance of equity securities and incurrence of debt;

•assumption of material liabilities in connection with the target or purchased technology, some of which may be difficult or impossible to identify at the time of acquisition;

•difficulties in integrating the operations of the acquired companies;

•failure of any acquired businesses or products or in-licensed products or

technologies to achieve the scientific, medical, commercial or other results we anticipate;

•diverting our management's attention away from other business opportunities and on-going operations;

•the potential loss of our key employees or key employees of the acquired companies;

•risks of entering disease areas and indications or modalities in which we have limited or no direct experience; and

•significant investments in resources and personnel to evaluate, integrate and develop acquisition and in-license programs.

A substantial portion of our strategic efforts are focused on opportunities for rare disorders, but the availability of such opportunities may be limited. We may not be able to identify opportunities that satisfy our strategic criteria or are acceptable to us or our stockholders. Several companies have publicly announced intentions to establish or develop rare disease programs and we may compete with these companies (some of which may be larger and may be able to provide more consideration than we can) for the same opportunities. For these and other reasons, we may not be able to acquire the rights to additional product candidates or approved products on acceptable terms, or at all. In such event, we may not be able to further rebuild our pipeline and any future revenue may remain largely dependent on our existing products, which are subject to the risks noted above.

In addition, through our business development initiatives we have acquired or obtained rights to new technologies, including a therapy to reverse Factor Xa inhibitors, Factor D small molecules and two FcRN platforms (in February 2020, based on data from our Phase I study, we terminated the agreement to co-develop ABY-039 with Affibody, which was the developer of one such FcRN platform), among others. These technologies are intended to diversify our pipeline and revenue base (if products based on these technologies are, where applicable, approved by regulatory authorities), but we have limited experience with these technologies, including developing these therapies, operating clinical trials with these therapies, obtaining regulatory approval and commercializing these assets. If we are unable to successfully bring these products to market and to increase sales of approved medicines in the case of ANDEXXA, we may not be able to diversify our revenue or generate a return on our investments.

Even if we are able to successfully identify and complete acquisitions and other strategic transactions, we may not be able to integrate or take full advantage of them. An acquisition or other strategic transaction may or may not result in short-

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term or long-term benefits to us (such as our transactions with Affibody and Stealth). A commercial stage product or near-commercial stage product acquired may not result in the revenues that we anticipate or we may be unable to realize expected profits on sales due to expenses related to the manufacturing and/or sales of the commercial product. We may also incorrectly judge the value or worth of an acquired company or business or an acquired or in-licensed product, particularly if the acquired technology is in preclinical trials or early-stage clinical trials. Any therapies we acquire that are pre-clinical or in clinical trials may not result in a commercialized product and any revenues, if the product is commercialized, may not meet our projections or result in generating an adequate return on our investment.

The acquired business of Portola may underperform relative to our expectations, and we may not achieve anticipated synergies.

We completed the acquisition of Portola on July 2, 2020. Through the acquisition, we acquired ANDEXXA, a commercial-stage product that is intended, in part, to diversify our revenue from reliance on C5 inhibitors. The acquired business of Portola may underperform relative to our expectations, which may cause our financial results to differ from our own or the investment community’s expectations, and it may not result in the revenue or generate the operating income in the future that we anticipate. The ultimate success of the acquisition will depend, in part, on Alexion’s ability to successfully integrate the Portola business and realize the anticipated benefits, including synergies, innovation opportunities and operational manufacturing and sales efficiencies, from the acquisition and successful execution of our relaunch strategy for ANDEXXA, including expansion into new geographies and label expansion to include new indications. If we are unable to achieve our objectives within the anticipated time frame, or at all, the anticipated benefits may not be realized fully or at all, or may take longer to realize than expected, and the value of Alexion’s common stock may decline. In addition, if the results of the Phase IV post-marketing trial required by the FDA does not meet the safety and efficacy requirements of the FDA, ANDEXXA (the product that generated almost all of Portola’s revenues) may be withdrawn from the market or otherwise subject to regulatory restrictions which may limit the ability to realize expected value from the transaction. Andexanet alfa also received conditional approval in the EU.

The integration of the two companies may result in material challenges, including, without limitation:

•the diversion of management’s attention from ongoing business concerns;

•managing a larger combined business that includes a new therapeutic area for Alexion;

•retaining existing business and operational relationships, including customers, suppliers and employees and other counterparties, and attracting new business and operational relationships; and

•coordinating geographically separate organizations.

The financial results of ANDEXXA, and our ability to generate returns on our investment in Portola, will require that we successfully commercialize this product (which received conditional approval from the FDA in 2018). ANDEXXA utilization will depend, in large part, on access for the therapy at both the institutional level (where adoption will be driven by hospitals and emergency care facilities including ANDEXXA in the approved protocols for care and by ANDEXXA being qualified for adequate reimbursement by payers for use) and at the individual prescriber level (where adoption will be driven by immediate physical access to the product as it will be used in the acute care setting and by acceptance and endorsement of use by individual physicians who will need to be satisfied with, among other things, ANDEXXA's safety and efficacy). In addition, ANDEXXA may not gain expected market acceptance due to, among other reasons: pricing and reimbursement decisions and lower than anticipated usage at facilities and dosing. While we do have experience with obtaining institutional approval for our therapies and promoting acute care products (SOLIRIS and ULTOMIRIS for aHUS) we will need to effectively address the needs of institutions and prescribers, as noted above, in order to increase sales of ANDEXXA.

In order to support potential growth of the business, we will be required to make significant investments in our business operations.

To effectively manage our current and future potential growth, we must continue to effectively enhance and develop our global employee base and our operational and financial processes. Supporting our growth strategy may require significant capital expenditures and management resources, including investments in research, development, sales and marketing, clinical trial capabilities, manufacturing and other areas of our operations. Efforts to advance our product pipeline, including the increased number of clinical trials that are under way or will commence in the future, will require significant expense in 2021. The development or expansion of our business, any acquired business or any acquired or in-licensed products may require a substantial capital investment by us and we may likely incur substantial expenses in advancing acquired products through development, trials, regulatory approval and to commercialization. We may not have the necessary funds for these capital expenditures

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and expenses or these funds might not be available to us on acceptable terms, or at all. We may also seek to raise funds by incurring additional indebtedness and selling shares of our capital stock (where permitted under our existing contractual obligations), which could dilute current stockholders’ ownership interest in our company, or securities convertible into our capital stock (where permitted under our existing contractual obligations), which could dilute current stockholders’ ownership interest in us upon conversion.

Completion of proof of concept trials, biomarker studies, preclinical studies or clinical trials does not guarantee advancement to the next phase of development or regulatory approval or successful commercialization.

Conducting clinical trials is a complex, time-consuming and expensive process and there are no guarantees that any trial will meet its endpoints or objectives. Completion of preclinical studies or clinical trials does not guarantee that we will initiate additional studies or trials for our product candidates, if further studies or trials are initiated, what the scope and phase of the trial will be or that they will be completed, or if these further studies or trials are completed, that the design or results may provide a sufficient basis to apply for or receive regulatory approvals or to commercialize products. Results of clinical trials could be inconclusive, requiring additional or repeat trials. Data obtained from preclinical studies and clinical trials are subject to varying interpretations that could delay, limit or prevent regulatory approval. Many companies have believed their product candidates performed satisfactorily in clinical trials but nonetheless failed to obtain marketing approval of their drug candidate. If the design or results achieved in our clinical trials are insufficient to proceed to further trials or to sustain regulatory approval of our product candidates, our business could be materially adversely affected. Failure of a clinical trial to achieve its pre-specified primary endpoint or objective generally increases the possibility that additional studies or trials may be required if we even determine to continue development of the product candidate, reduces the likelihood of timely development of and regulatory approval to market the product candidate, and may decrease the chances for successfully achieving the primary endpoint(s) or objective(s) in scientifically similar indications.

We are currently planning and conducting several clinical trials of products and product candidates that we anticipate may be important to our goal of expanding our business and diversifying our product portfolio. These trials may not yield the anticipated results for a number of reasons and may not result in a product that obtains regulatory approval.

ULTOMIRIS may not be approved as a treatment for additional indications or in other jurisdictions and any clinical trials may not achieve the designated endpoints and prove to be effective for use in patients with these additional indications. For example, we have initiated Phase III clinical trials for ULTOMIRIS as a treatment for: (i) Amyotrophic Lateral Sclerosis (ALS), (ii) patients with COVID-19, who are hospitalized with severe COVID-19 requiring mechanical ventilation and (iii) patients with HSCT TMA, (and we plan to initiate studies of ULTOMIRIS in other indications). There is no guarantee that the Phase III clinical trial for ALS, and HSCT TMA (or the additional studies that we are planning for ULTOMIRIS) will provide sufficient evidence to advance our research beyond these stages. Drug development is very uncertain. We had, for example, conducted an exploratory clinical study in Primary Progressive Multiple Sclerosis (PPMS) that we have decided to no longer pursue based on biomarker analysis. Further, in January 2021, based on the recommendation of the IDMC, we recently paused enrollment in our ULTOMIRIS trial for certain COVID-19 patients due to lack of efficacy.

In addition, we are also conducting clinical trials in therapeutic areas with which we have limited experience (for example, ALXN1840 (WTX101), a therapy for Wilson’s disease), Factor D small molecules, and with technology platforms with which we also have limited experience (for example, humanized monoclonal antibody that inhibits the interaction of FcRn with Immunoglobulin G (IgG) and IgG immune complexes). Further, we plan to initiate a Phase II clinical trial for ALXN2040 in Geographic Atrophy (GA), which is our first clinical trial in ophthalmology, an indication with which we have limited experience at Alexion. In addition, we intend to also initiate a proof of concept trial using a Factor D molecule, ALXN2050, in patients with various renal diseases. And we are pursuing trials to expand the label for ANDEXXA to treat additional acute care indications. Each of these clinical trials, and any other trial we commence, require significant financial expenses and operational resources, is subject to the risks highlighted above and the investments we have made in these technologies may not generate the expected returns.

Our clinical studies may be costly and lengthy, and there are many reasons why drug testing could be delayed or terminated.

For human trials, patients must be recruited and each product candidate must generally be tested at various doses and formulations for each clinical indication. Many of our programs focus on diseases and conditions with small patient populations making patient enrollment difficult and requiring a relatively large number of trial sites to meet enrollment

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requirements to power our clinical trials to our desired levels for efficacy and, in certain cases, superiority. Additionally, we can have multiple clinical trials running for the same indication, further challenging clinical trial enrollment. Insufficient patient enrollment in our clinical trials could delay or cause us to abandon a product development program. We may decide to abandon development of a product candidate or a study at any time due to unfavorable results or other reasons, including if there are concerns about patient safety (as patients have, and may in the future, suffer injuries during clinical trials). If initial trials do not produce adequate results, we may have to spend considerable resources repeating clinical trials or conducting additional trials, either of which may increase costs and delay revenue from those product candidates, if any. We may open clinical sites and enroll patients in countries where or for indications in which we have little experience.

Even if we were to complete clinical trials for one or more of our therapies, we or regulatory authorities may determine that the results are not be sufficient for filing a BLA or NDA or granting approval to market the therapy.

We rely on a small number of clinical research organizations to carry out our clinical trial related activities, and two contract research organizations (CROs) are responsible for many of our studies. We rely on such parties to enroll clinical sites and patients, operate trials and accurately report their results. Our reliance on CROs may impact our ability to control the timing, conduct, expense and quality of our clinical trials. In addition, we may be responsible for any errors in clinical trials by a CRO as a result of the performance of services in connection with a clinical trial on our behalf. And regulatory agencies, in connection with a potential product approval or as part of ongoing monitoring, will review a CRO's compliance with regulatory requirements relating to clinical trials and we may be subject to findings and regulatory action (including denial or delay of product approval) if a CRO fails to comply with regulations.

Additional factors that can cause delay, impairment or termination of our clinical trials or our product development efforts include:

•delay or failure in obtaining institutional review board (IRB) approval or the approval of other reviewing entities to conduct a clinical trial at each site;

•delay or failure in reaching agreement on acceptable terms with prospective CROs and clinical trial sites, the terms of which can be subject to extensive negotiation and may vary significantly among different CROs and trial sites;

•withdrawal of clinical trial sites from our clinical trials as a result of changing standards of care or the ineligibility of a site to participate in our clinical trials;

•clinical sites and investigators deviating from trial protocol, failing to conduct the trial in accordance with regulatory requirements, or dropping out of a trial;

•delay or failure in having patients complete a trial or return for post-treatment follow-up;

•lack of sufficient supplies of the product candidate;

•disruption of operations at the clinical trial sites;

•adverse medical events or side effects in treated patients;

•failure of patients taking the placebo to continue to participate in our clinical trials;

•insufficient clinical trial data to support safety and effectiveness of the product candidates;

•lack of effectiveness or safety of the product candidate being tested;

•decisions by regulatory authorities, the IRB, ethics committee, or us, or recommendation by a data safety monitoring board, to suspend or terminate clinical trials at any time for safety issues or for any other reason;

•failure to obtain the necessary regulatory approvals for the product candidate or the approvals for the facilities in which such product candidate is manufactured; and

•decisions by competent authorities, IRBs or ethics committees to demand variations in protocols or conduct of clinical trials

We expect our operating results to fluctuate.

Our quarterly revenues, expenses and net income (loss) may fluctuate, even significantly, due to certain risks, including those described in these “Risk Factors,” as well as the timing of charges and expenses that we may take, acquisitions and business development transactions and the impact of converting patients from SOLIRIS to ULTOMIRIS (as noted above). We may not be able to sustain or increase profitability on a quarterly or annual basis. Since we have a limited sales and operating history with certain of our products and for new indications of existing products (such as ANDEXXA and the 100mg/mL formulation of ULTOMIRIS), we may not be able to accurately forecast demand for our products or for new indications and formulations. Product demand and, in the case of conversion to ULTOMIRIS, product preference and conversion, is dependent on a number of factors, many of which are beyond our control. For

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these reasons, we may not be able to accurately forecast demand for our products. You should not consider our financial performance, including our revenue growth, in recent periods as indicative of our future performance.

We cannot guarantee that we will achieve our financial goals, including our ability to maintain profitability on a quarterly or annual basis in the future.

In the future, we may not generate sufficient revenues or control expenses to achieve our financial goals. Our investors and investment analysts may have widely varying expectations that may be materially higher or lower than actual revenues and profits and if our revenues and profits are different from these expectations, our stock price may experience significant volatility. Our revenues and profits are also subject to foreign exchange rate fluctuations due to the global nature of our operations and our results of operations could be adversely affected due to unfavorable foreign exchange rates. Although we use derivative instruments to manage foreign currency risk, our efforts to reduce currency exchange losses may not be successful.

In addition, we have in the past provided financial guidance and anticipated customers for certain indications for future periods (including neurology patients in the U.S. using our products), and future product launches and if our actual operating results fail to meet or exceed the guidance or forecasts that we have previously provided to our investors, our stock price could drop suddenly and significantly. Financial guidance, anticipated customer levels and product launches are based on certain assumptions about future performance and such guidance and forecasts are not a guarantee that the targets set forth will be achieved. In addition, due to the potential impact of COVID-19 on our business, operations and results of operations (including our revenues), the estimates, judgments and inputs required to generate guidance and customer levels are increasingly uncertain and therefore accurately forecasting performance is even more challenging in light of the current health crisis.

As we attempt to grow and expand our business, we may have substantial expenses as we continue our research and development efforts and our efforts to develop the assets we have acquired through acquisitions, collaborations and in-licenses, continue to undertake additional business development activities, continue to conduct clinical trials and continue to develop and expand manufacturing, sales, marketing and distribution capabilities worldwide, some of which could be delayed, scaled-back or eliminated to control expenses and/or achieve our financial objectives. Additionally, business development activities may include milestone and royalty obligations and may require substantial

investment in research and development to achieve product approval. These expenses may increase and such increases may exceed analyst and investor expectations.

If we fail to attract and retain highly qualified personnel, we may not be able to successfully develop, manufacture or commercialize our products or products candidates.

The success of our business is dependent in large part on our continued ability to attract and retain our senior management, and other highly qualified personnel in our scientific, clinical, manufacturing, governmental regulations and commercial organizations and across the many geographies in which we operate. There is intense competition in the biopharmaceutical industry for these types of personnel.

Our business is specialized and global and we must attract and retain highly qualified individuals across many geographies and areas of expertise. We may not be able to continue to attract and retain the highly qualified personnel necessary to develop, manufacture and commercialize our products and product candidates. If we are unsuccessful in our recruitment and retention efforts, or if our recruitment efforts take longer than anticipated, our business may be harmed.

We may not achieve some or all of the expected benefits of our current and future restructuring plans and restructurings may adversely affect our business.

We initiated our most recent restructuring in the third quarter 2020, which is principally focused within our commercial organization as part of an initiative intended to redefine our operating model and reallocate resources necessary to align our organization with our diversifying portfolio of new products and strategic objectives. We may undertake additional restructurings in the future. Implementation of a restructuring plan may be costly and disruptive to our business, and we may not be able to obtain the estimated cost savings and benefits that were initially anticipated in connection with a restructuring in a timely manner, or at all. Additionally, as a result of any restructuring, we may experience a loss of continuity, loss of accumulated knowledge and/or inefficiency during transitional periods. Reorganization and restructuring can require a significant amount of management and other employees’ time and focus, which may divert attention from operating and growing our business. If we fail to achieve some or all of the expected benefits of restructuring, it could have an adverse effect on our business, financial condition, results of operations and cash flows.

If we fail to satisfy our debt service obligations or our contingent obligations, we may be unable to

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commercialize our products or continue or complete our product development.

We have significant debt service obligations. In addition to the obligations to make interest and principal payments under our credit facility throughout the term of the loans, any changes in interest rates related to this debt could significantly increase our annual interest expense and any hedging of this interest may not be effective to control expenses.

Our Amended and Restated Credit Agreement requires us to comply with certain financial covenants and negative covenants, restricting or limiting our ability and the ability of our subsidiaries to, among other things, incur additional indebtedness, grant liens, and engage in certain investment, acquisition and disposition transactions, subject to limited exceptions. If an event of default occurs (due to, for example, the failure to comply with certain covenants in the Amended and Restated Credit Agreement), the interest rate may increase and the administrative agent may be entitled to take various actions, including the acceleration of amounts due under the Amended and Restated Credit Agreement. If the interest rate imposed under our Amended and Restated Credit Agreement were to increase as a result of a default (or for any other reason), our expenses may increase and we may need to allocate additional funds to this interest expense (which may limit the use of these funds for other purposes, including growing our business or responding to changes in our business and industry). If some or all of the amounts outstanding under the Amended and Restated Credit Agreement were to be accelerated by the lenders, we may not have sufficient cash on hand to pay the amounts due, we may not be able to refinance such debt on terms acceptable to us (or at all) and we may be required to sell certain assets on terms that are unfavorable to us.

In addition, we have substantial contingent liabilities, including milestone and royalty obligations associated with acquisitions and strategic transactions, and we have been, and in the future may again be, engaged in disputes with certain counterparties regarding potential milestone and royalty obligations (we are currently subject to a claim in litigation in connection with the Syntimmune acquisition that we failed to meet our obligations with respect to the contingent consideration and plaintiff has requested payment of the full earn-out amount). Our increased indebtedness, including increased interest expense, together with our significant contingent liabilities, could, among other things:

•make us more vulnerable to economic or industry downturns and competitive pressures;

•make it difficult for us to make payments on our credit facilities and require us to use cash

flow from operations to satisfy our debt obligations, which may reduce the availability of our cash flow for other purposes, including business development efforts and research and development;

•limit our ability to incur additional debt or access the capital markets; and

•limit our flexibility in planning for, or reacting to changes in, our business.

Our ability to satisfy our obligations under the Amended and Restated Credit Agreement and meet our debt service obligations and our royalty and milestone obligations will depend upon our future performance, which will be subject to financial, business and other factors affecting our operations, many of which are beyond our control.

We may not be able to access the capital and credit markets on terms that are favorable to us or at all.

We may need to raise additional capital in accordance with our existing contractual commitments to supplement our existing funds and cash generated from operations for working capital, capital expenditure and debt service requirements, and other business activities (including business and technology acquisitions). The amount of capital we may need depends on many factors, including, the cost of any acquisition or any new collaborative, licensing or other commercial relationships that we may establish, the time and cost necessary to build and complete new manufacturing facilities or enhance our manufacturing and related operations, amounts we may need to pay in connection with the resolution of any government investigation or litigation matter (including any securities class action matter or any product liability claim or any tax assessment or liability), the cost of obtaining and maintaining the necessary regulatory approvals for our manufacturing facilities, and the progress, timing and scope of our preclinical studies, clinical trials and product development and commercialization efforts. The capital and credit markets have experienced and may continue to experience extreme volatility and disruption. We may not receive additional funding when we need it or funding may only be available on unfavorable terms. If we cannot raise adequate funds to satisfy our working capital, capital requirements and debt repayment obligations (or royalty and milestone obligations) or business development activities, we may have to delay, scale-back or eliminate certain research, development, manufacturing, acquisition or commercial activities or sell certain assets and technologies.

We have incurred significant impairment charges, and may continue to incur such charges in the future for certain of our assets, including goodwill in connection with acquisitions, and such amounts may be material.

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If the purchase price of a business acquisition exceeds the value of the assets (and liabilities) acquired, the acquirer must recognize goodwill in such amount. We may be required to recognize impairment charges for our goodwill and other intangible assets, and such charges may be material and have an adverse impact on our financial results in the period such charges are incurred and may also have an adverse impact on our reputation.

As of March 31, 2021, the net carrying value of our goodwill and other intangible assets, net totaled $8,148.4. As required by GAAP, we evaluate goodwill and intangible assets for impairment on an annual basis, or as facts and circumstances warrant. We have recorded charges that include inventory write-downs for failed quality specifications or recalls, impairments with respect to investments and acquisitions, fixed assets and long-lived assets, outcomes of litigation and other legal or administrative proceedings, regulatory matters and tax matters, and payments in connection with acquisitions and other business development activities, such as milestone payments. The impairment of tangible and intangible assets may be triggered by developments both within and outside our control. Deteriorating economic conditions, technological changes, disruptions to our business, inability to effectively integrate acquired businesses, unexpected significant changes or planned changes in the use of the assets, adverse clinical results, intensified competition, divestitures, market capitalization declines and other factors may impair our goodwill and other intangible assets.

As part of our standard quarterly procedures, we review facts and circumstances regarding our long-lived assets, including the KANUMA asset, to assess for potential indicators of impairment. During the quarter ended June 30, 2020, based on continued challenges expanding patient growth and new alternative commercial opportunities, we revised our strategic view of KANUMA and determined that we have exhausted commercially viable initiatives related to KANUMA and will have difficulty expanding patient growth over the long term as we focus on promoting other commercial programs and growing our pipeline. While management is committed to continued access to KANUMA for existing patients and providing access to future patients diagnosed with LAL-D, as we grow our business and product offerings, including through the recent acquisition of Portola Pharmaceuticals, we will prioritize programs where the opportunity to find patients who can benefit from Alexion therapies is the greatest. Therefore, we no longer expect to increase the number of KANUMA patients at the rate we previously assumed in our cash flow projections for KANUMA. As a result of these developments during the second quarter 2020, management adjusted assumptions in our long term cash flow forecast

model for KANUMA and recognized an impairment charge of $2,042.3 related to the associated intangible asset.

Cash flow models used in our assessments of intangible assets are based on the projected commercial sales of the underlying products which considers, where applicable, our commercial experience with the product to date. Cash flow models for products currently in development also include the likelihood of approval. These cash flow models require the use of significant estimates and judgements, which include, but are not limited to, probability of regulatory approval, market access assumptions, long-range pricing expectations and patient-related assumptions, including patient identification, conversion and retention rates. As we continue to develop and sell products that have a related intangible asset associated with it, new data may cause us to adjust the assumptions in our cash flow models. Changes to assumptions used in our net cash flow projections may result in material impairment charges in subsequent periods, similar to the impairment charge recognized in the second quarter 2020 related to KANUMA.

The efficiency of our corporate structure depends on the application of the tax laws and regulations in the countries where we operate and we may have exposure to additional tax liabilities or our effective tax rate could increase, which could have a material impact on our results of operations and financial position.

As a company with international operations, we are subject to income taxes, as well as non-income based taxes, in both the U.S. and various foreign jurisdictions. Significant judgment is required in determining our worldwide tax liabilities. Although we believe our estimates are reasonable at the time made, the final taxes we owe may differ from the amounts recorded in our financial statements (and such differences may be material). If the IRS, or other taxing authority, disagrees with the positions we take (and such tax authorities have disagreed with certain positions we have taken in prior years, and may do so again the future), we could have additional tax liability, and this could have a material impact on our results of operations and financial position. Our effective tax rate could be adversely affected by changes in the mix of earnings in countries with different statutory tax rates, changes in the valuation of deferred tax assets and liabilities, changes in tax laws and regulations, including potential changes following the U.S. presidential and congressional elections, changes in interpretations of tax laws, including pending tax law changes, changes in our manufacturing activities and changes in our future levels of research and development spending.

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We have designed, and from time to time we modify, our corporate structure, the manner in which we develop and use our intellectual property, and our intercompany transactions between our affiliates in a way that is intended to enhance our operational and financial efficiency and increase our overall profitability. The application of the tax laws and regulations of various countries in which we operate and to our global operations is subject to interpretation. We also must operate our business in a manner consistent with our corporate structure to realize such efficiencies. The tax authorities of the countries in which we operate may challenge our methodologies for valuing developed technology or for transfer pricing or other operations. If tax authorities determine that the manner in which we operate results in our business not achieving the intended tax consequences, our effective tax rate could increase (and such increase may be material) and harm our financial position and results of operations. For example, in August 2020, we received a notice of examination from the Dutch Tax Authorities (“DTA”) regarding certain matters relating to our 2014 through 2017 tax years. We entered into an agreement with the DTA in December 2020 and have agreed to pay approximately $73.8 in connection with the settlement, inclusive of the 2018 and 2019 tax years. After taking into account the $56.1 U.S. foreign tax credit claimed on the settlement, the net cash outflow was $17.7, representing a 3.1% net increase to the effective tax rate in that period. In addition, certain governments are considering and may adopt tax reform measures that significantly increase our worldwide tax liabilities. The Organization for Economic Co-operation and Development and other government bodies have focused on issues related to the taxation of multinational corporations, including, in the area of “base erosion and profit shifting,” where payments are made from affiliates in jurisdictions with high tax rates to affiliates in jurisdictions with lower tax rates. It is possible that these reform measures could increase our effective tax rate (and such increase may be material) and harm our financial position and results of operations over the next several years.

Our sales and operations are subject to a variety of risks relating to the conduct of our international business.

We have increased our international presence, including in emerging markets. Our operations in foreign countries subject us to a variety of risks, including:

•difficulties or the inability to obtain necessary foreign regulatory or reimbursement approvals of our products in a timely manner or at all;

•political or economic determinations or decisions that adversely impact pricing or reimbursement policies in foreign countries;

•economic problems or political instability;

•fluctuations in currency exchange rates;

•difficulties or inability to obtain financing in markets;

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

•customs and tax officials in foreign jurisdictions may disagree with the value we set when we or others import our products (including products that are donated for charitable purposes or used for clinical trials) and we may be required to pay additional duties or fines and such amounts may be substantial. For example, our offices in Brazil were visited by the Brazilian federal tax authorities and we received a written notice from such authorities requesting information with respect to the importation of SOLIRIS free of charge to patients in Brazil from 2014 to 2019. In connection with this matter, in August 2019, the Brazilian Federal Revenue Service provided a Notice of Tax and Description of the Facts to, among others, two Alexion subsidiaries. This notice focuses on: (i) the identity of the importer and (ii) the importation value of SOLIRIS vials in connection with Alexion’s free drug program in Brazil. See Note 17, Commitments and Contingencies to the condensed consolidated financial statements for more information on this matter);

•difficulties in establishing and enforcing contractual and intellectual property rights;

•compliance with complex import and export control laws;

•trade restrictions and restrictions on direct investments by foreign entities;

•compliance with local tax, employment and labor laws;

•costs and difficulties in recruiting and retaining qualified managers and employees to manage and operate the business in local jurisdictions;

•costs and difficulties in managing and monitoring international operations; and

•longer payment cycles.

Additionally, our business, operations and marketing methods are subject to the laws and regulations of the countries in which we operate, which may differ significantly from country to country

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and may conflict with U.S. laws and regulations. The FCPA and anti-bribery laws and regulations in the locations in which we operate our business are extensive and far-reaching, and we must maintain accurate records and control over the activities of our employees, distributors and third party service providers in countries where we operate. We have policies and procedures, and we are committed to continually focusing on our compliance program and we continue to enhance our comprehensive company-wide program and efforts, and these are designed to enhance our business processes, structures, controls, training, talent, and systems across Alexion’s global operations and to help us and our representatives, including our employees and our vendors and distributors, comply with such laws. We cannot, however, guarantee that these policies, programs and procedures will protect us against liability under the FCPA or other anti-bribery laws for actions taken by us, our employees or our representatives. Any determination that our operations or activities are not in compliance with existing laws or regulations, including the FCPA and the UK Anti-Bribery Act, could result in the imposition of fines, civil and criminal penalties, equitable remedies, including disgorgement, injunctive relief, and/or other sanctions against us, and remediation of such findings could have a material and adverse effect on our business operations. In addition, as our international operations expand, we are likely to become subject to new anti-corruption/anti-bribery laws or existing laws may govern our activities in new jurisdictions in which we commence operations. In addition, as we have moved from a direct sales force to third-party sales force, distributors and marketers in certain countries and regions, we may also have liability under the FCPA and anti-bribery laws and regulations for the actions of these third parties. Although we can impose contractual restrictions on what these third parties are authorized to do on our behalf, we will exercise only limited control over the actions of these third parties but may still face the same liabilities for their actions. Our failure, and the failure of others who we engage to act on our behalf, to comply, with the laws and regulations of the countries in which we operate, or will operate in the future, could materially harm our business.

Our business involves environmental risks and potential exposure to environmental liabilities.

As a biopharmaceutical company, our business involves the use of certain hazardous materials in our research, development, manufacturing and other activities. We and our third party providers are subject to various federal, state, local and foreign environmental laws and regulations concerning the handling and disposal of regulated wastes, such as medical and biological wastes, chemical wastes and potential emissions and discharges into the

environment (including air, soils and water sources). We also are subject to laws and regulations that impose liability and clean-up responsibility for releases of hazardous substances into the environment and a current or previous owner or operator of property may be liable for the costs of remediating such property or locations (should a release occur), without regard to whether the owner or operator knew of or caused the contamination. Although our safety procedures for handling and disposing of hazardous materials are designed to comply with the laws and regulations established by state, federal, local and foreign regulators, the risk of loss of, or accidental contamination or injury from, these materials cannot be eliminated. If an incident or environmental discharge occurs, or if we discover contamination caused by prior owners and operators of properties we acquire, we could be liable for remediation obligations, damages and fines that could exceed our insurance coverage and financial resources. Such obligations and liabilities, which to date have not been material, could have a material impact on our business and financial condition. Additionally, the cost of compliance with environmental and safety laws and regulations may increase in the future, and we may be required to dedicate more resources, including substantial financial resources, to comply with such laws and regulations or purchase supplemental insurance coverage, which may not be available on acceptable terms or at all.

Currency fluctuations and changes in exchange rates could adversely affect our revenue, increase our costs and negatively affect our profitability.

We conduct a substantial portion of our business in currencies other than the U.S. dollar. We are exposed to fluctuations in foreign currency exchange rates and such fluctuations affect our operating results. The exposures result from portions of our revenues, as well as the related receivables and expenses, that are denominated in currencies other than the U.S. dollar, including the Euro, Japanese Yen, British Pound, Canadian dollar and Turkish Lira. We cannot predict fluctuations in currency exchange rates and such fluctuations in exchange rates (and inflation) could negatively affect our business, cash flow, results of operations, financial position and prospects. We manage a portion of our foreign currency transaction risk within specified guidelines through the use of derivatives. All of our derivative instruments are utilized for risk management purposes, and we do not use derivatives for speculative trading purposes. While our hedging agreements may limit some of the exposure to exchange rate and interest rate fluctuations, such attempts to mitigate these risks may be costly and not always successful and the results may have a material impact on our results of operations.

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Risks Related to the Regulatory Environment

We operate in a highly regulated industry and if we or our third-party providers fail to comply with U.S. and foreign regulations, we or our third party providers could lose our approvals to market our products or our product candidates, and our business may be seriously harmed.

We and our current and future third-party vendors, including contract manufacturers, CROs, distributors and suppliers and logistic providers are subject to rigorous and extensive regulation by governmental authorities around the world, including the FDA, EMA, the competent authorities of the EU Member States and the MHLW. These regulations, many of which are complex, relate to almost all aspects of our business, including GCP, GLP, cGMP and pharmacovigilance rules (for additional information on the regulations relating to our business, see “Business - Government Regulation” in Item 1 included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2020). If we or a regulatory agency discover new or previously unknown problems with a product, including adverse events of unanticipated severity or frequency, or problems with the facility where a product is manufactured (such as product contamination), or in the case of KANUMA, problems with animal operations, a regulatory agency may impose restrictions on that applicable product, the manufacturing facility or us. In 2013, we received a Warning Letter from the FDA relating to compliance with FDA’s cGMP requirements at one of our facilities, which was remediated. If we had failed to address the FDA’s concerns or if we (or one of our third-party contract manufacturers) were to receive another Warning Letter in the future relating to cGMP or other applicable regulations, the FDA or other regulatory authorities could take regulatory action, including fines, civil penalties, recalls, seizure of product, suspension of manufacturing operations, operating restrictions, injunctions, suspension of clinical trials, withdrawal of FDA (or other regulatory authority) approval and/or criminal prosecution.

If we or our third-party providers, including our product or raw material manufacturers, product fill-finish providers, packagers and labelers, fail to comply fully with applicable regulations, then we may be required to, among other things, initiate a recall or withdrawal of our products. In addition to our manufacturing operations and those of our contract manufacturers’ manufacturing operations being subject to inspection and potential regulatory action for failure to comply with (among other regulations) cGMP, our animal operations may also be subject to FDA and U.S. Department of Agriculture, Animal and Plant Health Inspection Service (USDA APHIS) inspection to evaluate whether our animal husbandry, containment, personnel, and record keeping practices

are sufficient to ensure safety and security of our transgenic chickens and animal products (e.g., eggs, waste, etc.). Any failure to ensure safety and security of our transgenic chickens and/or animal products could result in regulatory action by the FDA or another regulatory body, including USDA APHIS.

Failure to comply with the laws and requirements that apply to our business, including statutes and regulations, administered by the FDA, the EMA, the competent authorities of the EU Member States, the MHLW or other comparable agencies, could result in:

•a product recall;

•a product withdrawal;

•modification or revision to a product label;

•significant administrative and judicial sanctions, including, warning letters or untitled letters;

•significant fines and other civil penalties;

•suspension, variation or withdrawal of a previously granted approval for our products;

•interruption, suspension or termination of production;

•operating restrictions, such as a shutdown of production facilities or production lines, or new manufacturing requirements;

•suspension or termination of ongoing clinical trials;

•delays in approving or refusal to approve our products, including pending BLAs, NDAs or BLA or NDA supplements for our products, or a facility that manufactures our products;

•seizing or detaining product;

•requiring us or third-parties performing services for us to enter into a consent decree, which can include imposition of various fines, reimbursements for inspection costs, required due dates for specific actions and penalties for noncompliance;

•injunctions; and/or

•criminal prosecution.

In addition, we are subject to antitrust regulations with respect to interactions with other participants in the markets we currently serve or may serve in the future. These antitrust laws are vigorously enforced in the U.S. and in other jurisdictions in which we operate.

Our product candidates require extensive preclinical and clinical testing and regulatory approval and failure to satisfy regulatory requirements relating to safety and efficacy thresholds may prevent us from being able to market our products and limit our ability to grow our business and diversify our revenue.

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We believe our future success may depend on our ability to develop and commercialize our product candidates and, to this end, we have acquired companies and technologies in an effort to expand our product pipeline. Our product candidates are in various stages of development and must satisfy the rigid safety and efficacy requirements of the FDA and other foreign regulatory agencies before they can be approved for sale to patients. To satisfy these standards, we must ensure, among other things, that we have appropriately established our protocol designs, obtained the necessary IRB approval (or comparable approval), provided adequate patient enrollment rates, timely and appropriately reported any adverse events and serious adverse events to the appropriate authorities and ensured compliance with cGLP and cGCP. If we or our third-party clinical trial providers or third-party CROs do not successfully carry out these clinical activities, our clinical trials or the potential regulatory approval of a product candidate may be delayed or be unsuccessful.

If we discover safety or safety reporting issues with any of our approved products, or if we fail to comply with continuing U.S. and applicable foreign regulations as they relate to our products and operations, our revenue may decrease, an approved product could lose its marketing approval or sales could be suspended and our business could be materially harmed.

Following marketing approval of a pharmaceutical product, the safety profile of such product continues to be closely monitored by the FDA and other foreign regulatory authorities. Regulations continue to apply after product approval, and cover, among other things, testing, manufacturing, quality control, finishing, filling, labeling, advertising, promotion, risk mitigation, adverse event reporting requirements and export of biologics and small molecule compounds. Included in the post-approval marketing requirements are, for example, the REMS program for both SOLIRIS and ULTOMIRIS in the U.S., and a REMS program can be updated from time to time by the FDA and such updates can be costly and burdensome to implement. In addition, continued approval for ANDEXXA for its currently approved indication in the US is contingent upon post-marketing study results that verify that clinical benefit is conferred to patients.

We are required to report any serious and unexpected adverse experiences and certain quality problems with our products to the FDA, the EMA, the MHLW and other health agencies. Adverse safety events involving our products may have a negative impact on our business. Discovery of safety issues with our products could result in product liability claims and could cause additional regulatory scrutiny and requirements for revised labeling, additional safety monitoring, withdrawal of products from the

market and the imposition of fines or criminal penalties. In addition, governmental authorities are making greater amounts of safety information directly available to the public through periodic safety update reports, patient registries and other reporting requirements. The reporting of adverse safety events may also damage physician, patient and/or investor confidence in our products and our reputation. Any adverse events in connection with the use of our products could result in liabilities, loss of revenues, material write-offs of inventory, material impairments of intangible assets, goodwill and fixed assets, material restructuring charges, product liability claims and other adverse impacts on our results of operations.

Regulatory agencies periodically inspect our pharmacovigilance processes. If these regulatory agencies determine that we or other parties whom we do not control that perform pharmacovigilance-related services on our behalf, including clinical trial investigators and distributors, have not complied with the applicable reporting or other pharmacovigilance requirements, we may become subject to additional inspections, clinical holds, warning letters or other enforcement actions, including monetary fines, marketing authorization withdrawal and other penalties.

As a condition of approval for marketing our products, governmental authorities may require us to conduct additional studies. In connection with the approval of SOLIRIS we established a PNH Registry and an aHUS Registry to collect additional data on patients. Furthermore, in connection with the approval of STRENSIQ in the U.S., we agreed to conduct a prospective observational study in treated patients to assess the long-term safety of STRENSIQ therapy and to develop complementary assays. In the case of ANDEXXA, it was approved under the FDA’s Accelerated Approval Pathway, and received conditional marketing authorization in the EU based on the change from baseline in anti-Factor Xa activity in healthy volunteers and in patients through the ANNEXA-4 trial demonstrating hemostatic efficacy. Continued approval for this indication is contingent upon post-marketing study results that verify that clinical benefit is conferred to patients. In the U.S., the FDA can also propose to withdraw approval for a product if it determines that such additional studies are inadequate or if new clinical data or other information shows that a product is not safe for use in an approved indication.

In addition, similar or more stringent post-approval requirements and obligations may be imposed by the FDA and/or other regulatory agencies with respect to any of our future products that obtain regulatory approval. Compliance with these post-approval requirements could result in increased cost

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and expense and decrease our operating margins and, if we are unable to comply with these requirements, we may be subject to regulatory action by the applicable regulatory agency and the penalties may include fines and product withdrawals or restrictions in the use of a product.

If we fail to comply with applicable healthcare laws and regulations, including those related to healthcare fraud and abuse, we may be subject to investigations and civil or criminal penalties and our business could be adversely affected.

We are subject to healthcare “fraud and abuse” laws, such as the False Claims Act (FCA), the anti-kickback provisions of the federal Social Security Act, laws prohibiting off-label product promotion and other related federal and state laws and regulations.

The federal Anti-Kickback Statute prohibits, among other things, knowingly and willfully offering, paying, soliciting or receiving any remuneration, directly or indirectly, in cash or in kind to induce, or reward the purchasing, leasing, ordering or arranging for or recommending the purchase, lease or order of any healthcare item or service reimbursable under Medicare, Medicaid, or other federal healthcare programs. Liability may be established without a person or entity having actual knowledge of the federal Anti-Kickback Statute or specific intent to violate it. A conviction for violation of the Anti-kickback Statute requires mandatory exclusion from participation in federal healthcare programs. The majority of states also have statutes similar to the federal Anti-Kickback Statute and false claims laws that apply to items and services reimbursed under Medicaid and other state programs, or, in several states, apply regardless of the payer.

The FCA prohibits any person from knowingly presenting, or causing to be presented, a false or fraudulent claim for payment of government funds, or knowingly making, using or causing to be made or used, a false record or statement material to a false or fraudulent claim. Pharmaceutical companies have been investigated and have reached substantial financial settlements with the Federal government under the FCA for a variety of alleged promotional and marketing activities, such as allegedly providing free product to customers with the expectation that the customers would bill federal programs for the product; providing consulting fees and other benefits to physicians to induce them to prescribe products (including through the use of speaker programs); engaging in promotion of pharmaceuticals for uses that the FDA has not approved, or “off-label” uses; and submitting inflated best price information to the Medicaid Rebate Program.

We seek to comply with the Anti-Kickback Statute and FCA laws, including operating within any available safe harbors, but we cannot assure that our

compliance program, policies and procedures will always protect us from acts committed by employees or third-party distributors or service providers.

There is also enhanced scrutiny of company-sponsored patient assistance programs, including insurance premium and co-pay assistance programs and donations to third-party charities that provide such assistance. In 2019, we settled an investigation by the Department of Justice relating to our support for 501(c)(3) entities. If we, or our vendors or donation recipients, are deemed to fail to comply with relevant laws, regulations or government guidance in the operation of these programs again in the future, we could be subject to significant fines or penalties.

Other related federal and state laws and regulations that may affect our ability to operate include, among others, the federal False Statements Statute, the federal Civil Monetary Penalties Law, the HIPAA criminal federal health care fraud statute, the federal Open Payments program, state anti-kickback and false claims acts, and state and local disclosure requirements and marketing restrictions. Additional information about the scope of these requirements and potential penalties is provided under “Government Regulation - Fraud and Abuse” included in Part I, Item 1 of our Annual Report on Form 10-K for the fiscal year ended December 31, 2020.

In recent years, legislation has been adopted at the federal, state and local level requiring pharmaceutical companies to establish marketing compliance programs, file periodic reports or make periodic public disclosures on sales, marketing, pricing, clinical trials, health care provider payments and other activities. For example, as part of the Patient Protection and Affordable Care Act, as amended by the Health Care and Education Reconciliation Act of 2010 (collectively, the PPACA), the federal government enacted the Open Payments (commonly known as the Sunshine Act) provisions. Open Payments requires pharmaceutical manufacturers to report annually to CMS payments or other transfers of value made by that entity to physicians and teaching hospitals, and, for reports submitted on or after January 1, 2022, physician assistants, nurse practitioners, clinical nurse specialists, certified nurse anesthetists, and certified nurse-midwives. We also now have similar reporting obligations throughout the EU. Failure to comply with the reporting requirements may result in significant civil monetary penalties.

Violations of U.S. federal and state fraud and abuse laws (and comparable laws in foreign jurisdictions) may result in criminal, civil and administrative sanctions, including fines, damages, civil monetary penalties (which may be material in amount) and/or exclusion from federal healthcare programs (including Medicare and Medicaid). Any

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action initiated against us for violation of these laws, even if we successfully defend against it, could require the expenditure of significant resources and generate negative publicity, which could materially adversely affect our ability to operate our business and our financial results.

Finally, the FDA, the EU and EU Member States and the MHLW, among other regulatory agencies, impose restrictions on the promotion and marketing of drug products and prohibit pharmaceutical manufacturers from promoting products for indications other than those cleared or approved by regulatory authorities or for use in manner that is not consistent with the product label approved by regulatory agencies, or off-label promotion. In certain instances, physicians are, however, in their medical judgment permitted to use products for unapproved purposes and we are aware of such uses of SOLIRIS for example. Although we believe that our marketing materials and training programs for physicians do not constitute improper promotion, the FDA, the DOJ, other federal or state government agencies, the EU, EU Member States or the MHLW (or other foreign regulatory agencies) may disagree. If any governmental authority determines that our promotional materials, training or other activities constitute improper promotion of any of our products, it could request that we modify our training or promotional materials (which occurred in 2019 in Japan) or other activities or subject us to regulatory enforcement actions, including the issuance of a warning letter, product withdrawal or recall, injunction, seizure, civil fine and criminal penalties. It is also possible that other enforcement authorities might take action if they believe that the alleged improper promotion led to the submission and payment of claims for an unapproved use, which could result in significant fines or penalties under other statutory authorities, such as laws prohibiting false or fraudulent claims for payment of government funds.

Our business and operations may be materially adversely affected by government investigations.

We are subject to the FCPA, the U.K. Bribery Act and other anti-corruption laws and regulations that generally prohibit companies and their intermediaries from making improper payments to government officials and/or other persons for the purpose of obtaining or retaining business and we operate in countries that are recognized as having a greater potential for governmental and commercial corruption. While we have, and continue to, take steps that are intended to enhance our compliance and training programs, we cannot assure that our compliance program, policies and procedures will always protect us from acts committed by employees or third-parties acting on our behalf.

In May 2015, we received a subpoena in connection with an investigation by the Enforcement Division of the SEC requesting information related to our grant-making activities and compliance with the FCPA in various countries, including Brazil, Colombia, Japan, Russia and Turkey. In addition, in October 2015, we received a request from the DOJ for the voluntary production of documents and other information pertaining to our compliance with the FCPA. The SEC and DOJ also sought information related to our recalls of specific lots of SOLIRIS and related securities disclosures. DOJ informed us that it closed its inquiry into these matters. We settled the investigation with the SEC in July 2020, and made payment of approximately $21.5 in disgorgement, civil penalties, and pre-judgment interest in connection with the settlement. In addition, following the settlement with the SEC in July 2020, the Ministry of Health in Turkey initiated an investigation regarding the matters referenced in the SEC Order as they relate to the Company’s operations in Turkey between 2010 and 2015 (for more information, see Note 17, Commitments and Contingencies to our condensed consolidated financial statements). We are cooperating with this investigation.

In May 2017, Brazilian authorities seized records and data from our Sao Paulo, Brazil offices as part of an investigation being conducted into our Brazilian operations. At this time, we are unable to predict the duration, scope or outcome of the open investigations. In addition, even though we have settled the DOJ investigation relating generally to our support of certain 501(c)(3) organizations that was initiated by the U.S. Attorney’s Office for the District of Massachusetts in December 2016, the SEC investigation (which was settled in July 2020), the DOJ investigation (that was closed by the DOJ in May 2020) and the MHLW closed its 2018 investigation into our Japanese operations, we may be subject to similar investigations in the future by the same or other regulatory agencies and government authorities and the penalties imposed on us may be materially greater in amount or we may be subject to material limitations on our operations, activities and our business. In addition, any remedial actions that have been or will be taken with the intent to address the matters that were the subject of these or other governmental investigations may not prevent future investigations and potential liability as a result of such further investigations.

Any determination that our operations or activities are not, or were not, in compliance with existing U.S. or foreign laws or regulations, could result in the imposition of a broad range of civil and criminal sanctions against us and certain of our directors, officers and/or employees, including injunctive relief, disgorgement, substantial fines or penalties, imprisonment, and other legal or equitable

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sanctions, including exclusion from Medicare, Medicaid, and other governmental healthcare programs. Any attempts to resolve some or all of these matters may not be successful. If we were to engage in settlement discussions with respect to any current or future investigation or litigation (and we may accrue amounts due to the nature of such discussions), but the matter is not settled, the ultimate resolution may result in monetary or other penalties materially greater or stricter than the amounts or terms that we proposed in discussions (or the amount that we accrued for such matter during negotiations). Additionally, remediation of any such findings resulting from these and any future investigations could have an adverse effect on our business operations, and we could experience interruptions of business, harm to our reputation, debarment from government contracts, loss of supplier, vendor or other third-party relationships, and necessary licenses and permits could be terminated. Other internal or government investigations or legal or regulatory proceedings, including lawsuits brought by private litigants, may also follow as a consequence. Cooperating with and responding to requests for information in connection with these ongoing investigations, as well as responding to any future U.S., state or foreign governmental investigation or whistleblower lawsuit, has resulted and could continue to result in substantial expenses, and could divert management’s attention from other business concerns and could have a material adverse effect on our business and financial condition and growth prospects.

Our business could be adversely affected by litigation and regulatory enforcement actions.

We operate in many jurisdictions in a highly regulated industry and we could be subject to litigation, government investigations (as noted above) and enforcement and other legal actions on a variety of matters in the U.S. or foreign jurisdictions, including, without limitation, intellectual property, regulatory, product liability, tax and custom/import duties, environmental, whistleblower, Qui Tam, false claims, privacy, anti-kickback, anti-bribery, securities, commercial, employment and other claims and legal proceedings which may arise from conducting our business. We are involved in certain legal proceedings from time to time. See Note 17, Commitments and Contingencies to our condensed consolidated financial statements included elsewhere in this Quarterly Report on Form 10-Q for information on certain of these legal proceedings. In addition, in connection with any acquisitions, we may assume potential liability related to pending legal proceedings of the acquired company. For example, securities class action complaints were filed against Portola and certain officers of Portola alleging violation of the antifraud provisions of the Exchange Act of 1934 and

the Securities Act of 1933 due to misrepresentations and omissions in public disclosures concerning sales of andexanet alfa between January 8, 2019 and February 26, 2020. Legal proceedings are inherently unpredictable, and the outcome can result in costly verdicts, fines and penalties, exclusion from federal healthcare programs and/or injunctive relief that affect how we operate our business. Defense of litigation claims can be expensive, time consuming and distracting, and it is possible that we could incur judgments or enter into settlements of claims for monetary damages or change the way we operate our business, which could have a material adverse effect on our product sales, business and results of operations. In addition, product liability is a major risk in testing, selling, using and marketing biotechnology and pharmaceutical products. We may face potential product liability exposure in human clinical trials and for products we sell after regulatory approval. Product liability claims, regardless of their merits, could be costly and divert management’s attention and could adversely affect our reputation and the demand for our products and result in significant monetary liability.

Changes in healthcare laws and implementing regulations, as well as changes in healthcare policy, may affect coverage and reimbursement of our products in ways that we cannot currently predict and these changes could adversely affect our business and financial condition.

In the U.S., there have been a number of legislative and regulatory initiatives focused on containing the cost of healthcare. The PPACA, for example, substantially changed the way healthcare is financed by both governmental and private insurers in the U.S., and significantly impacts the pharmaceutical industry. The PPACA contains a number of provisions that are expected to impact our business and operations, in some cases in ways we cannot currently predict. Changes that may affect our business include those governing enrollment in federal healthcare programs, reimbursement changes, rules regarding prescription drug benefits under health insurance exchanges, expansion of the 340B program, expansion of state Medicaid programs, fraud and abuse enforcement and rules governing the approval of biosimilar and generic products (and allowing biosimilars access to the market in accordance with the FDA’s Biosimilars Action Plan). These changes may impact existing government healthcare programs, industry competition, formulary composition, and may result in the development of new programs, including Medicare payment for performance initiatives, health technology assessments and improvements to the physician quality reporting system and feedback program. In 2016, CMS implemented changes to the Medicaid Drug Rebate Program under the PPACA and

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promulgated a final regulation in December 2020 implementing further changes to the program, as described in “Government Regulation - U.S. Healthcare Reform and Other U.S. and International Healthcare Laws” included in Part I, Item 1 of our Annual Report on Form 10-K for the fiscal year ended December 31, 2020. Moreover, in the future, Congress could enact legislation that further increases Medicaid drug rebates or other costs and charges associated with participating in the Medicaid Drug Rebate Program, the MFN Model may ultimately be implemented or the executive branch may issue similar pricing or discount initiatives that impact SOLIRIS or our other products. The issuance of regulations and coverage expansion by various governmental agencies relating to the Medicaid Drug Rebate Program has and may continue to decrease revenues, increase our costs and the complexity of compliance, has been and may be time-consuming, and could have a material adverse effect on our results of operations.

Similar cost-reduction efforts to those in the United States, and in some cases even more aggressive efforts, are being taken by governments to control the costs of pharmaceutical drugs and regulate the industry in countries outside the U.S. In these markets outside the U.S., the pricing and reimbursement of pharmaceutical products is subject to direct or indirect governmental control and such government authorities are increasingly attempting to limit or regulate the price of drug products and due to their control over pricing are able to move quickly to implement pricing changes. In certain cases, governments may challenge the price we charge for our products already delivered to patients under applicable regulations in those countries (and if these governments prevail, we could be required to return amounts to the government or the government may take steps in an attempt to claw-back amounts that were previously paid to us and such amounts may be material).

We may face uncertainties as a result of federal and administrative efforts to repeal, substantially modify or invalidate some or all of the provisions of the PPACA and with respect to the potential implementation of the MFN Model. There is no assurance that the PPACA or MFN Model, as currently enacted or as amended in the future, will not adversely affect our business and financial results, and we cannot predict how future federal, state or foreign legislative or administrative changes relating to healthcare reform may affect our business. The recent COVID-19 pandemic may introduce temporary or permanent healthcare reform measures for which we cannot predict the financial implication on our business.

State governments have sought to put in place limits and caps on pharmaceutical prices and have also requested rebates for certain pharmaceuticals. Attempts to decrease prices of pharmaceutical products may lead to increased use of managed care organizations by Medicaid programs which could lead to managed care organizations influencing prescription decisions for beneficiaries and a corresponding limitation on prices and reimbursement for our products.

Governments in countries where we operate have adopted or have also shown significant interest in pursuing legislative initiatives to reduce costs of healthcare. We expect that the implementation and enforcement of current laws and policies, the amendment of those laws and policies in the future, as well as the adoption of new laws and policies, could have a material adverse effect on our industry generally and on our ability to maintain or increase our product sales or revenues or successfully commercialize our product candidates, or could limit or eliminate our future spending on development projects and product candidates. The announcement or adoption of regulatory or legislative proposals could delay or prevent our entry into new markets, affect our reimbursement or sales in the markets where we are already selling our products and materially harm our business, financial condition and results of operations.

If we fail to comply with our reporting and payment obligations under the Medicaid Drug Rebate Program, Medicare, or other governmental pricing programs, we could be subject to additional reimbursement requirements, penalties, sanctions and fines which could have a material adverse effect on our business, financial condition, results of operations and prospects.

We participate in and have certain price reporting obligations to the Medicaid Drug Rebate Program and we have obligations to report the average sales price under the Medicare program. Under the Medicaid Drug Rebate Program, we are required to pay a rebate to each state Medicaid program for quantities of our products that are dispensed to Medicaid beneficiaries and paid for by a state Medicaid program as a condition of having federal funds being made available to the states for our products under Medicaid and for payment to be available for our products under Medicare Part B. Those rebates are based on pricing data reported by us on a monthly and quarterly basis to CMS. Any failure to comply with these price reporting and rebate payment obligations could negatively impact our financial results.

Pricing and rebate calculations vary among products and programs. The calculations are complex and are often subject to interpretation by us, governmental or regulatory agencies and the courts.

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We cannot assure you that our submissions will not be found by CMS or other applicable government authorities to be incomplete or incorrect. Governmental agencies may also make changes in program interpretations, requirements or conditions of participation, some of which may have implications for amounts previously estimated or paid. Recalculations increase our costs for complying with the laws and regulations governing these programs, including the Medicaid Drug Rebate Program. Any corrections to our rebate calculations could result in an underage in our rebate liability for past quarters, and such amount may be material. Price recalculations also may affect the ceiling price at which we are required to offer our products to certain covered entities under the 340B pricing program.

We are liable for errors associated with our submission of pricing data. In addition to retroactive rebates and the potential for 340B program refunds, civil monetary penalties can be applied if we are found to have knowingly submitted any false pricing information to the government, if we are found to have made a misrepresentation in the reporting of our average sales price, or if we fail to submit the required pricing data on a timely basis. Such conduct also could be grounds for CMS to terminate our Medicaid drug rebate agreement, pursuant to which we participate in the Medicaid program. In the event that CMS terminates our rebate agreement, federal payments may not be available under Medicaid or Medicare Part B for our covered outpatient drugs and any such actions could negatively impact our business and results of operations.

The Public Health Service’s 340B drug pricing program, and other comparable government and payer regulations, may have a negative impact on the price we can charge for our products and result in a decrease in revenues.

Federal law requires that any manufacturer that participates in the Medicaid Drug Rebate Program also participate in the Public Health Service’s 340B drug pricing program in order for federal funds to be available for the manufacturer’s drugs under Medicaid and Medicare Part B. The 340B pricing program requires participating manufacturers to agree to charge statutorily-defined covered entities no more than the 340B “ceiling price” for the manufacturer’s covered outpatient drugs. The 340B pricing program is described in “Government Regulation – Pharmaceutical Pricing and Reimbursement” included in Part I, Item 1 of our Annual Report on Form 10-K for the fiscal year ended December 31, 2020. The 340B ceiling price is calculated using a statutory formula, which is based on the average manufacturer price and rebate amount for the covered outpatient drug as calculated under the Medicaid Drug Rebate Program. We are a participant in the 340B drug pricing program

and are, for the applicable covered entities, subject to the price ceiling. Any changes to the 340B drug pricing program, including:

•the method of calculating the 340B ceiling price for our products;

•any expansion of the entities that qualify as covered entities; and

•other programmatic changes

could have a material and negative impact our revenue and results of operations.

Pursuant to a final rule adopted on January 1, 2019, we could be subject to civil monetary penalties if the government finds that we knowingly and intentionally overcharged a 340B covered entity. In addition, the 340B pricing program also obligates a manufacturer to offer the 340B price to covered entities if the manufacturer makes the drug available to any other purchaser at any price and to report to the government the ceiling prices for its drugs.

Beyond the Public Health Service’s 340B drug pricing program, federal law requires that a company must participate in the Department of Veterans Affairs Federal Supply Schedule (FFS) pricing program to be eligible to have its products paid for with federal funds. If we overcharge the government in connection with our FSS contract or Section 703 Agreement, whether due to a misstated FCP or otherwise, we are required to refund the difference to the government. Failure to make necessary disclosures and/or to identify contract overcharges can result in allegations against us under the FCA and other laws and regulations. Unexpected refunds to the government, and responding to a government investigation or enforcement action with respect to our pricing or participation in government health programs, may be expensive, and could have a material adverse effect on our business, financial condition, results of operations and growth prospects.

We may be subject to numerous and varying privacy and security laws, and our failure to comply could result in penalties and reputational damage.

We are subject to laws and regulations covering data privacy and the protection of personal information including health information. The legislative and regulatory landscape for privacy and data protection continues to evolve, and there has been an increasing focus on privacy and data protection issues which have affected and may affect our business. In the U.S., numerous federal and state laws and regulations, including state security breach notification laws, state health information privacy laws, and federal and state consumer protection laws, which govern the collection, use, disclosure, and protection of personal information. Each of these laws is subject to varying interpretations by courts and

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government agencies, creating complex compliance issues for us. If we fail to comply with applicable laws and regulations, we could be subject to penalties or sanctions, including criminal penalties if we, our affiliates, or our agents knowingly obtain or disclose individually identifiable health information from a HIPAA covered entity in a manner that is not authorized or permitted by HIPAA.

In addition, numerous proposals regarding privacy and data protection are pending before U.S. and non-U.S. legislative and regulatory bodies. For example, in the U.S., the California Consumer Privacy Act (CCPA) became effective as of January 1, 2020, and the California Attorney General finalized regulations and began enforcement of the CCPA on July 1, 2020. However, obligations under the CCPA also continue to evolve, as the California Attorney General has proposed further modifications to the regulations. Moreover, the CCPA was amended by a ballot initiative, the California Privacy Rights Act (CPRA), which was included on the November 2020 ballot in California and approved by California voters. The majority of CPRA provisions will go into effect on January 1, 2023 and will require additional investment in compliance programs and potential modifications to business processes.

Numerous other countries have, or are developing, laws governing the collection, use and transmission of personal information as well. Further, the EU’s General Data Protection Regulation (GDPR) and implementing laws in the EU member states govern the collection and processing of EU residents’ personal data and, among other requirements, imposes certain consent and data access rights. Such laws may impact, among other things, our ability to conduct clinical trials that involve EU personal data and engage in other activities that require the processing of EU personal data and in particular international transfers of personal data. These laws are complex, subject to interpretation by local authorities, and any determination that we breached such laws could lead to government enforcement actions, significant penalties and these may adversely impact our operating results.

Privacy and data protection laws, industry standards, regulations and regulatory enforcement in the U.S. and internationally continue to evolve. In May 2018, the EU’s GDPR, which applies in all EU Member States, went into effect. The regulation introduced comprehensive data protection requirements in the EU and substantial fines for breaches of the data protection rules. It increased our responsibility and liability in relation to personal data that we process and we may be required to put in place additional mechanisms ensuring compliance with evolving EU data protection rules. The GDPR also includes restrictions on the transfers of personal data from the

EU to jurisdictions that have not been deemed to provide essentially equivalent data protection safeguards through national laws outside of certain legal transfer mechanisms. In July 2020, the Court of Justice of the European Union invalidated the EU-U.S. Privacy Shield as one means of transferring data to the United States, and called for additional assessments in the context of reliance upon standard contractual clauses. While Alexion was not Privacy Shield certified, additional compliance efforts may be needed to respond to evolving EU regulatory guidance. Any determination that we are not in compliance with such requirements could lead to government enforcement actions and significant penalties, which may adversely impact our operations.

Security breaches, cyber-attacks, other disruptions to, or vulnerabilities in, our information technology systems and infrastructure, or those of our clients, partners, counterparties, or other third-party service providers on which we rely, could expose us to liability and affect our business and reputation.

We are increasingly dependent on our information technology systems and infrastructure for our business. We collect, store and transmit sensitive information including intellectual property, proprietary business information and personal information in connection with business operations. The secure maintenance of this information is critical to our operations and business strategy. Some of this information could be an attractive target of criminal attack by third parties with a wide range of motives and expertise, including organized criminal groups, “hacktivists,” patient groups, disgruntled current or former employees and others. Cyber-attacks are of ever-increasing levels of sophistication, and despite our security measures, our information technology and infrastructure may be vulnerable to such attacks or may be breached, including due to employee error or malfeasance. We have implemented information security measures designed to protect patients’ personal information and other corporate information (including proprietary information) against the risk of inappropriate and unauthorized external use and disclosure. However, despite these measures, and due to the ever-changing information cyber-threat landscape, we may be subject to data breaches through cyber-attacks. Any such breach could compromise our networks and the information stored there could be accessed, publicly disclosed, lost or stolen. If our information technology systems become compromised, we may not promptly discover the intrusion. Like other companies in our industry, we have experienced attacks to our data and systems, including malware and computer viruses. If our systems failed or were breached or disrupted, we could lose product sales, and suffer reputational damage and loss of customer confidence. Such incidents may result in notification obligations to

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affected individuals and government agencies, legal claims or proceedings, and liability under foreign, federal and state laws that protect the privacy and security of personal information. Our proprietary and confidential information may also be accessed. Any one of these events could cause our business to be materially harmed and our results of operations may be adversely impacted.

Additionally, in response to the ongoing COVID-19 pandemic, we have generally required all employees who are able to work from home to do so until further notice. As a result of these measures, and as our employees continue to work from home and access our systems remotely, we may be subject to heightened information security risks, including the risk of cyber attacks.

Negative public opinion and increased regulatory scrutiny of recombinant and transgenic products, genetically modified products and genetically modified animals generally may damage public perception of our KANUMA product.

KANUMA is a transgenic product produced in the egg whites of genetically modified chickens who receive copies of the human lysosomal acid lipase gene to produce recombinant human lysosomal acid lipase. The success of KANUMA may depend, in part, on public attitudes of the use of genetic engineering. Public attitudes may be influenced by claims and perceptions that these types of activities or products are unsafe, and our products may not gain sufficient acceptance by, or fall out of favor with, the public or the medical community. Negative public attitudes to genetic engineering activities in general could result in more restrictive legislation or regulations and could impede our ability to conduct our business, delay preclinical or clinical studies, or otherwise prevent us from commercializing our product.

Risks Related to Our Common Stock

Our stock price is volatile.

The trading price of our common stock has been volatile and may continue to be volatile in the future. Many factors could have an impact on our stock price, including fluctuations in our or our competitors’ operating results, clinical trial results or adverse events associated with our products or our competitors' products, product development by us or our competitors, changes in laws, including healthcare, tax or intellectual property laws, intellectual property developments, changes in reimbursement or drug pricing, the existence or outcome of litigation or government proceedings, including the Chugai lawsuits alleging patent infringement, acquisitions or other strategic transactions, and the perceptions of our investors that we are not performing or meeting expectations. In addition, the sales of our common stock by our

officers, directors, or by any entities that an officer or director may be affiliated with, may have caused our stock price to drop in the past and any future sales by such officer, director or affiliate (or the perception that such sales could occur) may have a negative impact on our stock price. The trading price of the common stock of many biopharmaceutical companies, including ours, has experienced price and volume fluctuations, which have at times been unrelated to the operating performance of the companies whose stocks were affected.

Anti-takeover provisions in our charter and bylaws and under Delaware law could make a third-party acquisition of us difficult and may frustrate any attempt to remove or replace our current management.

Our corporate charter and by-law provisions may discourage certain types of transactions involving an actual or potential change of control that might be beneficial to us or our stockholders. Our bylaws provide that special meetings of our stockholders may be called only by the Chairman of the Board of Directors, the President, the Secretary, or a majority of the Board of Directors, or upon the written request of stockholders who together own of record 25.0% of the outstanding stock of all classes entitled to vote at such meeting. Our bylaws also specify that the authorized number of directors may be changed only by resolution of the Board of Directors. Our charter does not include a provision for cumulative voting for directors, which may have enabled a minority stockholder holding a sufficient percentage of a class of shares to elect one or more directors. Under our charter, our Board of Directors has the authority, without further action by stockholders, to designate up to five million shares of preferred stock in one or more series. 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.

Because we are a Delaware corporation, the anti-takeover provisions of Delaware law could make it more difficult for a third party to acquire control of us, even if the change in control may be beneficial to stockholders. We are subject to the provisions of Section 203 of the Delaware General Laws, which prohibits a person who owns in excess of 15.0% of our outstanding voting stock from merging or combining with us for a period of three years after the date of the transaction in which the person acquired in excess of 15.0% of our outstanding voting stock, unless the merger or combination is approved in a prescribed manner.

Our amended and restated bylaws designate the courts located in the State of Delaware as the exclusive forum for certain litigation that may be

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initiated by our stockholders, which could limit our stockholders’ ability to obtain an alternate judicial forum for disputes with us.

Our amended and restated bylaws designate that, unless we consent in writing to the selection of an alternate forum, the state courts located in the State of Delaware (or if no state court within the State of Delaware has jurisdiction, the federal district court for the State of Delaware) will be the sole and exclusive forum for (i) any derivative action or proceeding brought on or on behalf of the Company, (ii) any action asserting a claim of breach of a fiduciary duty owed by any director or officer or other employee of the Company to the Company or the Company’s stockholders, (iii) any action asserting a claim against the Company or any director or officer or other employee of the Company arising pursuant to any provision of the Delaware General Company Law or the Company’s Certificate of Incorporation or the bylaws (as either may be amended from time to time),

or (iv) any action asserting a claim against the Company or any director or officer or other employee of the Company governed by the internal affairs doctrine. This exclusive forum provision would not apply to suits brought to enforce a duty or liability created by the Exchange Act or the Securities Act of 1933, as amended. As a stockholder in our Company, you are deemed to have notice of and have consented to the provisions of our amended and restated bylaws related to choice of forum. The choice of forum provision in our amended and restated bylaws may limit your ability to obtain an alternate judicial forum for disputes with us.

Item 2.UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS.

ISSUER PURCHASES OF EQUITY SECURITIES (amounts in millions, except per share amounts)

The following table summarizes our common stock repurchase activity during the first quarter 2021:

Period	Total Number of Shares Purchased	Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Programs	Maximum Dollar Value of Shares that May Yet Be Purchased Under the Program
January 1-31, 2021	—	$	—	—	$	2,024.7
February 1-28, 2021	—	$	—	—	$	2,024.7
March 1-31, 2021	—	$	—	—	$	2,024.7
Total	—	$	—	—

In November 2012, our Board of Directors authorized a share repurchase program. In February 2017, our Board of Directors increased the amount that we are authorized to expend on future repurchases to $1,000.0 under our repurchase program, which superseded all prior repurchase programs. The entire amount authorized pursuant to this February 2017 Board approval has been utilized. On October 22, 2019, the Board of Directors approved a share repurchase authorization of up to $1,000.0. On July 28, 2020, the Board of Directors approved a new share repurchase authorization of up to an additional $1,500.0. The repurchase program does not have an expiration date and we are not obligated to acquire a particular number of shares. The repurchase program may be discontinued at any time at our discretion. As of March 31, 2021, there is a total of $2,024.7 remaining for repurchases under the repurchase program.

Item 5.OTHER INFORMATION.

None.

107

Item 6.EXHIBITS.

(a)Exhibits:

31.1	Certificate of Chief Executive Officer pursuant to Exchange Act Rules 13a-14 and 15d-14, as adopted pursuant to Section 302 Sarbanes Oxley Act of 2002.
31.2	Certificate of Chief Financial Officer pursuant to Exchange Act Rules 13a-14 and 15d-14, as adopted pursuant to Section 302 of Sarbanes Oxley Act of 2002.
32.1	Certificate of Chief Executive Officer pursuant to Section 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes Oxley Act.
32.2	Certificate of Chief Financial Officer pursuant to Section 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes Oxley Act.
101	The following materials from the Alexion Pharmaceuticals, Inc. Quarterly Report on Form 10-Q for the quarter ended March 31, 2021 formatted in Inline eXtensible Business Reporting Language (iXBRL): (i) the Condensed Consolidated Balance Sheets as of March 31, 2021 and December 31, 2020, (ii) the Condensed Consolidated Statements of Operations for the three months ended March 31, 2021 and 2020, (iii) the Condensed Consolidated Statements of Comprehensive Income for the three months ended March 31, 2021 and 2020, (iv) the Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2021 and 2020, (v) the Condensed Consolidated Statements of Changes in Stockholders' Equity the three months ended March 31, 2021 and 2020, and (vi) Notes to Condensed Consolidated Financial Statements.
104	The cover page from this Quarterly Report on Form 10-Q for the quarter ended March 31, 2021, formatted in Inline XBRL.

108

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.

	ALEXION PHARMACEUTICALS, INC.
	By:	/s/    Ludwig N. Hantson, Ph.D.
Date: April 30, 2021		Ludwig N. Hantson, Ph.D. Chief Executive Officer (principal executive officer)
	By:	/s/    Aradhana Sarin, M.D.
Date: April 30, 2021		Aradhana Sarin, M.D. Executive Vice President and Chief Financial Officer (principal financial officer)

EX-31.1

Exhibit 31.1

I, Ludwig N. Hantson, Ph.D., certify that:

1I have reviewed this quarterly report on Form 10-Q of Alexion Pharmaceuticals, Inc.;

2Based 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;

3Based 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;

4The 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

5The 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.

Dated:	April 30, 2021	/s/    LUDWIG N. HANTSON, Ph.D.
		Chief Executive Officer

EX-31.2

Exhibit 31.2

I, Aradhana Sarin, certify that:

1I have reviewed this quarterly report on Form 10-Q of Alexion Pharmaceuticals, Inc.;

2Based 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;

3Based 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;

4The 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

5The 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.

Dated:	April 30, 2021	/s/     ARADHANA SARIN, M.D.
		Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the quarterly report on Form 10-Q of Alexion Pharmaceuticals, Inc. (the “Company”) for the fiscal quarter ended March 31, 2021 as filed with the Securities and Exchange Commission (the “Report”), I, Ludwig N. Hantson, Ph.D., Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, to my knowledge, that:

(1)the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated:	April 30, 2021	/s/    LUDWIG N. HANTSON, Ph.D.
		Chief Executive 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.

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO 18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the quarterly report on Form 10-Q of Alexion Pharmaceuticals, Inc. (the “Company”) for the fiscal quarter ended March 31, 2021 as filed with the Securities and Exchange Commission (the “Report”), I, Aradhana Sarin, Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, to my knowledge, that:

(1)the Report fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2)the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Dated:	April 30, 2021	/s/     ARADHANA SARIN, M.D.
		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

Cover Page - shares	3 Months Ended
	Mar. 31, 2021	Apr. 28, 2021
Document and Entity Information [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Mar. 31, 2021
Document Transition Report	false
Entity File Number	0-27756
Entity Registrant Name	ALEXION PHARMACEUTICALS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	13-3648318
Entity Address, Address Line One	121 Seaport Boulevard
Entity Address, City or Town	Boston
Entity Address, State or Province	MA
Entity Address, Postal Zip Code	02210
City Area Code	475
Local Phone Number	230-2596
Title of 12(b) Security	Common Stock $0.0001 par value
Trading Symbol	ALXN
Security Exchange Name	NASDAQ
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Central Index Key	0000899866
Current Fiscal Year End Date	--12-31
Entity Common Stock, Shares Outstanding		221,019,230
Amendment Flag	false
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	Q1

XML

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Assets
Cash and cash equivalents	$ 3,429.6	$ 2,964.5
Marketable securities	39.7	34.9
Trade accounts receivable, net	1,473.0	1,409.3
Inventories	803.9	775.7
Prepaid expenses and other current assets	706.4	648.6
Total current assets	6,452.6	5,833.0
Property, plant and equipment, net	1,244.8	1,238.8
Intangible assets, net	3,048.3	3,002.4
Goodwill	5,100.1	5,100.1
Right of use operating assets	216.8	223.1
Deferred tax assets	2,140.6	2,199.4
Other assets	447.0	506.2
Total assets	18,650.2	18,103.0
Liabilities and Stockholders' Equity
Accounts payable	125.3	118.6
Accrued expenses	910.7	1,084.7
Current portion of long-term debt	143.2	142.4
Current portion of contingent consideration	120.0	114.9
Other current liabilities	127.0	164.1
Total current liabilities	1,426.2	1,624.7
Long-term debt, less current portion	2,388.8	2,419.6
Contingent consideration	303.5	299.4
Deferred tax liabilities	1,639.1	1,632.2
Noncurrent operating lease liabilities	170.8	177.1
Other liabilities	290.8	298.8
Total liabilities	6,219.2	6,451.8
Commitments and contingencies (Note 17)
Stockholders' Equity:
Common stock, $0.0001 par value; 290.0 shares authorized; 242.3 and 240.9 shares issued at March 31, 2021 and December 31, 2020, respectively	0.0	0.0
Additional paid-in capital	9,243.3	9,152.9
Treasury stock, at cost, 21.4 shares at March 31, 2021 and December 31, 2020	(2,620.5)	(2,620.3)
Accumulated other comprehensive loss	(85.2)	(124.6)
Retained earnings	5,879.2	5,243.2
Total Alexion stockholders' equity	12,416.8	11,651.2
Noncontrolling interest	14.2	0.0
Total stockholders' equity	12,431.0	11,651.2
Total liabilities and stockholders' equity	$ 18,650.2	$ 18,103.0

XML

Condensed Consolidated Balance Sheets (Parenthetical) - $ / shares shares in Millions	Mar. 31, 2021	Dec. 31, 2020
Statement of Financial Position [Abstract]
Common stock, par value	$ 0.0001	$ 0.0001
Common stock, shares authorized	290.0	290.0
Common stock, shares issued	242.3	240.9
Treasury Stock, Shares	21.4	21.4

XML

Condensed Consolidated Statements of Operations - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Total revenues	$ 1,636.5	$ 1,444.8
Costs and expenses:
Cost of sales (exclusive of amortization of purchased intangible assets)	125.4	111.7
Research and development	289.1	200.9
Selling, general and administrative	342.9	319.9
Amortization of purchased intangible assets	53.2	73.7
Change in fair value of contingent consideration	9.2	5.8
Acquired in-process research and development	193.3	0.0
Acquisition-related costs	13.2	38.1
Restructuring expenses	(0.7)	(0.8)
Gain on sale of assets	(25.3)	0.0
Total costs and expenses	1,000.3	749.3
Operating income	636.2	695.5
Other income and expense:
Investment expense, net	(7.0)	(5.2)
Interest expense	(27.1)	(25.8)
Other income and (expense)	0.5	(0.9)
Income before income taxes	602.6	663.6
Income tax expense	113.4	106.0
Net income	489.2	557.6
Net loss attributable to noncontrolling interest	146.8	0.0
Net income attributable to Alexion	$ 636.0	$ 557.6
Earnings per common share attributable to Alexion:
Basic (in dollars per share)	$ 2.89	$ 2.52
Diluted (in dollars per share)	$ 2.86	$ 2.50
Shares used in computing earnings per common share attributable to Alexion:
Basic	220.1	221.6
Diluted	222.6	222.6
Net product sales
Total revenues	$ 1,635.7	$ 1,444.6
Other revenue
Total revenues	$ 0.8	$ 0.2

XML

Condensed Consolidated Statements of Comprehensive Income Statement - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 489.2	$ 557.6
Other comprehensive income (loss), net of tax:
Foreign currency translation	(13.1)	(8.0)
Unrealized losses on debt securities	0.0	(0.2)
Unrealized gains (losses) on hedging activities, net of tax expense (benefit) of $15.8 and $(8.2), respectively	52.5	(26.5)
Other comprehensive income (loss), net of tax	39.4	(34.7)
Comprehensive income	528.6	522.9
Comprehensive loss attributable to noncontrolling interest	(146.8)	0.0
Comprehensive income attributable to Alexion	$ 675.4	$ 522.9

XML

Condensed Consolidated Statements of Comprehensive Income (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Unrealized loss on hedge, tax effect	$ 15.8	$ (8.2)

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Condensed Consolidated Statements of Changes in Stockholder's Equity Statement - USD ($) shares in Millions, $ in Millions	Total	Common Stock	Additional Paid-In Capital	Treasury Stock at Cost	Accumulated Other Comprehensive Income (Loss)	Retained Earnings	Total Alexion Stockholders' Equity	Noncontrolling Interest
Balances, common shares at Dec. 31, 2019		237.8
Balances, value at Dec. 31, 2019	$ 11,271.8	$ 0.0	$ 8,804.7	$ (2,105.9)	$ (66.8)	$ 4,639.8	$ 11,271.8	$ 0.0
Balances, treasury shares at Dec. 31, 2019				16.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of common stock under stock option and stock purchase plans, shares		0.1
Issuance of common stock under stock option and stock purchase plans	2.8		2.8				2.8
Issuance of restricted common stock, shares		1.0
Share-based compensation expense	57.4		57.4				57.4
Net income (loss)	557.6					557.6	557.6
Other comprehensive income (loss)	$ (34.7)				(34.7)		(34.7)
Repurchase of common stock, shares	1.3			1.3
Repurchase of common stock	$ (107.1)			$ (107.1)			(107.1)
Balances, treasury shares at Mar. 31, 2020				17.8
Balances, value at Mar. 31, 2020	11,747.8	$ 0.0	8,864.9	$ (2,213.0)	(101.5)	5,197.4	11,747.8	0.0
Balances, common shares at Mar. 31, 2020		238.9
Balances, common shares at Dec. 31, 2020		240.9
Balances, value at Dec. 31, 2020	$ 11,651.2	$ 0.0	9,152.9	$ (2,620.3)	(124.6)	5,243.2	11,651.2	0.0
Balances, treasury shares at Dec. 31, 2020	21.4			21.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
VIE noncontrolling interest upon consolidation	$ 161.0							161.0
Issuance of common stock under stock option and stock purchase plans, shares		0.1
Issuance of common stock under stock option and stock purchase plans	14.2		14.2				14.2
Issuance of restricted common stock, shares		1.3
Share-based compensation expense	76.0		76.2	$ (0.2)			76.0
Net income (loss)	489.2					636.0	636.0	(146.8)
Other comprehensive income (loss)	$ 39.4				39.4		39.4
Balances, treasury shares at Mar. 31, 2021	21.4			21.4
Balances, value at Mar. 31, 2021	$ 12,431.0	$ 0.0	$ 9,243.3	$ (2,620.5)	$ (85.2)	$ 5,879.2	$ 12,416.8	$ 14.2
Balances, common shares at Mar. 31, 2021		242.3

XML

Condensed Consolidated Statements of Cash Flows $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
Cash flows from operating activities:
Net income	$ 489.2	$ 557.6
Adjustments to reconcile net income to net cash flows from operating activities:
Depreciation and amortization	75.6	89.3
Change in fair value of contingent consideration	9.2	5.8
Share-based compensation expense	76.6	57.6
Consolidation of Caelum, including non-cash expense for acquired IPR&D and cash acquired	210.2	0.0
Deferred taxes	52.9	49.0
Unrealized foreign currency loss	10.9	7.1
Unrealized gain on forward contracts	(19.3)	(15.0)
Unrealized loss on strategic equity investments	9.6	9.2
Gain on sale of assets	(25.3)	0.0
Other	2.8	13.7
Changes in operating assets and liabilities, excluding the effect of acquisitions:
Accounts receivable	(87.9)	(120.9)
Inventories (inclusive of inventories reported in other assets)	(59.5)	37.3
Prepaid expenses, right of use operating assets and other assets	11.0	(72.9)
Accounts payable, accrued expenses, lease liabilities and other liabilities	(118.4)	(68.2)
Net cash provided by operating activities	637.6	549.6
Cash flows from investing activities:
Purchases of available-for-sale debt securities	0.0	(19.4)
Proceeds from maturity or sale of available-for-sale debt securities	0.0	141.4
Purchases of mutual funds related to nonqualified deferred compensation plan	(7.0)	(6.9)
Proceeds from sale of mutual funds related to nonqualified deferred compensation plan	3.3	3.3
Purchases of intangible assets	(110.0)	0.0
Purchases of property, plant and equipment	(20.2)	(12.2)
Payment for acquisition of businesses, net of cash and restricted cash acquired	0.0	(837.7)
Purchases of strategic equity investments and options	0.0	(34.5)
Net cash used in investing activities	(133.9)	(766.0)
Cash flows from financing activities:
Payments on term loan	(32.6)	(32.6)
Repurchases of common stock	0.0	(107.1)
Net proceeds from issuance of common stock under share-based compensation arrangements	15.2	2.8
Other	(1.3)	(1.3)
Net cash used in financing activities	(18.7)	(138.2)
Effect of exchange rate changes on cash and cash equivalents and restricted cash	(13.1)	(13.2)
Net change in cash and cash equivalents and restricted cash	471.9	(367.8)
Cash and cash equivalents and restricted cash at beginning of period	3,034.6	2,723.6
Cash and cash equivalents and restricted cash at end of period	3,506.5	2,355.8
Supplemental non-cash flow disclosures from investing and financing activities:
Contingent consideration issued in acquisitions	0.0	155.0
Exchange of intellectual property rights for strategic equity investments	5.0	0.0
Operating ROU lease assets obtained in exchange for operating lease liabilities	1.5	3.7
Accounts payable and accrued expenses for purchases of property, plant and equipment and intangible assets	5.4	13.0
Cash and cash equivalents	3,429.6	2,315.0
Restricted cash included in other current assets	76.9	40.7
Restricted cash included in other noncurrent assets	$ 0.0	$ 0.1

XML

Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Statement of Cash Flows [Abstract]
Restricted cash included in other current assets	$ 76.9	$ 70.0	$ 40.7
Restricted cash included in other noncurrent assets	$ 0.0	$ 0.1	$ 0.1

XML

Business

3 Months Ended

Mar. 31, 2021

Business [Abstract]

Business

Business

Business

Alexion Pharmaceuticals, Inc. (Alexion, the Company, we, our or us) is a global biopharmaceutical company focused on serving patients and families affected by rare diseases and devastating conditions through the discovery, development and commercialization of life-changing medicines.

As a leader in rare diseases for more than 25 years, Alexion has developed and commercializes two approved complement inhibitors to treat patients with paroxysmal nocturnal hemoglobinuria (PNH) and atypical hemolytic uremic syndrome (aHUS), as well as the first and only approved complement inhibitor to treat anti-acetylcholine receptor (AChR) antibody-positive generalized myasthenia gravis (gMG) and neuromyelitis optica spectrum disorder (NMOSD) in patients who are anti-aquaporin-4 (AQP4) antibody positive. Alexion also has two highly innovative enzyme replacement therapies and the first and only approved therapies for patients with life-threatening and ultra-rare metabolic disorders, hypophosphatasia (HPP) and lysosomal acid lipase deficiency (LAL-D) as well as the first and only approved Factor Xa inhibitor reversal agent for patients treated with rivaroxaban or apixaban when reversal of anticoagulation is needed due to life-threatening or uncontrolled bleeding.

In addition to our marketed therapies, we have a diverse pipeline resulting from internal innovation and business development. Alexion focuses its research efforts on novel molecules and targets in the complement cascade and its development efforts on the core therapeutic areas of hematology, nephrology, neurology, metabolic disorders, cardiology, ophthalmology and acute care. We were incorporated in 1992 under the laws of the State of Delaware.

Merger Agreement with AstraZeneca

On December 12, 2020, we entered into an Agreement and Plan of Merger (the Merger Agreement) with AstraZeneca PLC, a public limited company incorporated under the laws of England and Wales (AstraZeneca), Delta Omega Sub Holdings Inc., a Delaware corporation and a wholly owned subsidiary of AstraZeneca (Bidco), Delta Omega Sub Holdings Inc. 1, a Delaware corporation and a direct, wholly owned subsidiary of Bidco (Merger Sub I) and Delta Omega Sub Holdings LLC 2, a Delaware limited liability company and a direct, wholly owned subsidiary of Bidco (Merger Sub II). The Merger Agreement provides, among other things, that subject to the satisfaction or waiver of the conditions set forth therein (1) Merger Sub I will merge with and into Alexion (the “First Merger”), with Alexion surviving the First Merger as a wholly owned subsidiary of Bidco, and (2) immediately following the effective time of the First Merger (the Effective Time), Alexion will merge with and into Merger Sub II (the Second Merger and, together with the First Merger, the Mergers), with Merger Sub II surviving the Second Merger as a wholly owned subsidiary of Bidco and an indirect wholly owned subsidiary of AstraZeneca.

Under the Merger Agreement, at the Effective Time (as defined in the Merger Agreement), each share of common stock, par value $0.0001 per share, of Alexion issued and outstanding immediately prior to the Effective Time (other than certain excluded shares as described in the Merger Agreement) will be converted into the right to receive (1) 2.1243 American depositary shares of AstraZeneca (or, at the election of the holder thereof, a number of ordinary shares of AstraZeneca equal to the number of underlying ordinary shares represented by such American depositary shares) and (2) $60.00 in cash, without interest (collectively, the Merger Consideration).

The boards of directors of both companies have unanimously approved the acquisition.

The respective obligations of Alexion and AstraZeneca to consummate the transactions contemplated by the Merger Agreement are subject to the satisfaction or waiver of a number of customary conditions, including: (1) the adoption of the Merger Agreement by Alexion’s stockholders; (2) approval of the transactions contemplated by the Merger Agreement by AstraZeneca’s shareholders; (3) the absence of any law or order prohibiting consummation of the Mergers; (4) AstraZeneca’s registration statement on Form F-4 having been declared effective by the Securities and Exchange Commission; (5) AstraZeneca’s shareholder circular (or, if required, prospectus) having been approved by the U.K. Financial Conduct Authority; (6) the American depository shares of AstraZeneca issuable in the Mergers (and the ordinary shares of AstraZeneca represented thereby) having been approved for listing on the Nasdaq; (7) the expiration or early termination of the applicable waiting period under the Hart-Scott-Rodino Antitrust Improvements Act of 1976, as amended, and the approval of the Mergers under the antitrust and foreign investment laws of other specified jurisdictions; (8) accuracy of the other party’s representations and warranties, subject to certain materiality standards set forth in the Merger Agreement and (9) compliance by the other party in all material respects with such other party’s obligations under the Merger Agreement.

Without limiting the generality of the foregoing, we are subject to a variety of specified restrictions under the Merger Agreement. Unless we obtain AstraZeneca’s prior written consent (which consent may not be unreasonably withheld, conditioned or delayed) and except (i) as required or expressly contemplated by the Merger Agreement, (ii) as required by applicable law or (iii) as set forth in the confidential disclosure schedule delivered by Alexion to AstraZeneca, we may not, among other things and subject to certain exceptions and aggregate limitations, incur additional indebtedness, issue additional shares of our common stock outside of our equity incentive plans, repurchase our common stock, pay dividends, acquire assets, securities or property, dispose of businesses or assets, enter into material contracts or make certain additional capital expenditures.

Under the Merger Agreement, Alexion will be required to make a payment to AstraZeneca equal to $1,180.0 if the Merger Agreement is terminated in certain circumstances, including because the Alexion board of directors has changed its recommendation in favor of the Mergers or we terminated the Merger Agreement in order to enter into an agreement providing for a Company Superior Proposal (as defined in the Merger Agreement), and Alexion will be required to make a payment to AstraZeneca equal to $270.0 if the Merger Agreement is terminated because Alexion’s stockholders fail to adopt the Merger Agreement. AstraZeneca will be required to make a payment to Alexion equal to $1,415.0 if the Merger Agreement is terminated in certain circumstances, including because the AstraZeneca board of directors has changed its recommendation in favor of the Mergers or because AstraZeneca’s shareholders fail to approve the transactions contemplated by the Merger Agreement.

The acquisition is expected to close during the third quarter 2021.

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Basis of Presentation and Principles Of Consolidation

3 Months Ended

Mar. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation and Principles of Consolidation

Basis of Presentation and Principles of Consolidation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. These accounting principles were applied on a basis consistent with those of the consolidated financial statements contained in the Company's Annual Report on Form 10-K for the year ended December 31, 2020. In our opinion, the accompanying unaudited condensed consolidated financial statements include all adjustments, consisting of only normal recurring adjustments, necessary for a fair statement of our financial statements for interim periods presented in accordance with accounting principles generally accepted in the United States. The condensed consolidated balance sheet as of December 31, 2020 was derived from audited annual financial statements but does not include all disclosures required by accounting principles generally accepted in the United States. These interim financial statements should be read in conjunction with the audited financial statements for the year ended December 31, 2020 included in our Annual Report on Form 10-K for the year ended December 31, 2020. The results of operations for the three months ended March 31, 2021 are not necessarily indicative of the results to be expected for the full year or any other future periods.

Our significant accounting policies are described in Note 1 of the notes to the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2020 and updated, as necessary in this report.

The financial statements of our subsidiaries with functional currencies other than the U.S. dollar are translated into U.S. dollars using period-end exchange rates for assets and liabilities, historical exchange rates for stockholders' equity and weighted average exchange rates for operating results. Translation gains and losses are included in accumulated other comprehensive income (loss), net of tax, in stockholders' equity. Foreign currency transaction gains and losses are included in the results of operations in other income and expense.

The accompanying unaudited condensed consolidated financial statements include the accounts of Alexion Pharmaceuticals, Inc. and its subsidiaries, including Caelum Biosciences (Caelum), a variable interest entity (VIE) for which we are the primary beneficiary, refer to Note 10, Caelum Biosciences. All intercompany balances and transactions have been eliminated in consolidation.

We assess whether we are the primary beneficiary of a VIE at the inception of the arrangement and at each reporting date. This assessment is based on our power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and our obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE. For the consolidation of Caelum, we record net income (loss) attributable to noncontrolling interest in our consolidated statements of operations based on the ownership interest retained by the respective noncontrolling parties.

New Accounting Pronouncements

ASU 2020-04, “Reference Rate Reform, Facilitation of the Effects of Reference Rate Reform on Financial Reporting": In response to concerns about structural risks of interbank offered rates, and, particularly, the risk of cessation of the London Interbank Offered Rate (LIBOR), regulators around the world have undertaken reference rate reform initiatives to identify alternative reference rates that are more observable or transaction-based and less susceptible to manipulation. In March 2020, the Financial Accounting Standards Board (FASB) issued a new standard that provides optional guidance for a limited time to ease the potential burden in accounting for the effects of reference rate reform, including optional expedients and exceptions for the accounting implications of contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met.

The amendments in this new standard only apply to contracts and hedging relationships that reference LIBOR or another reference rate expected to be discontinued due to reference rate reform. The expedients and exceptions provided by the standard do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022. We are currently reviewing our contracts impacted by reference rate reform and are assessing the impact of this standard on our financial condition and results of operations.

Recently Adopted Accounting Pronouncements

Accounting Standards Update (ASU) 2019-12, “Income Taxes: Simplifying the Accounting for Income Taxes”: In December 2019, the FASB issued a new standard intended to simplify the accounting for income taxes by eliminating certain exceptions related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. The new standard also simplifies aspects of the accounting for franchise taxes and enacted changes in tax laws or rates and clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. The standard is effective for annual periods beginning after December 15, 2020 and interim periods within, with early adoption permitted. Adoption of the standard requires certain changes to be made prospectively, with some changes to be made retrospectively. We adopted the new standard on January 1, 2021. The adoption of this standard did not have an impact on our financial condition and results of operations.

ASU 2020-01, “Investments - Equity Securities, Investments - Equity Method and Joint Ventures, and Derivatives and Hedging - Clarifying the Interactions Between Topic 321, Topic 323, and Topic 815”: In January 2020, the FASB issued a new standard intended to clarify the interactions between Accounting Standards Codification (ASC) 321, ASC 323 and ASC 815. The new standard addresses accounting for the transition into and out of the equity method and measurement of certain purchased options and forward contracts to acquire investments. The standard is effective for annual and interim periods beginning after December 15, 2020, with early adoption permitted. Adoption of the standard requires changes to be made prospectively. We adopted the new standard on January 1, 2021. The adoption of this standard did not have an impact on our financial condition and results of operations.

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Acquisitions

3 Months Ended

Mar. 31, 2021

Business Combinations [Abstract]

Acquisitions

Acquisitions

Business Combinations

Achillion Pharmaceuticals, Inc.

In October 2019, Alexion entered into a definitive agreement to acquire Achillion Pharmaceuticals, Inc. (Achillion), a clinical-stage biopharmaceutical company focused on the development of oral Factor D inhibitors. Achillion was developing oral small molecule Factor D inhibitors to treat people with complement alternative pathway-mediated rare diseases, such as PNH and C3 glomerulopathy (C3G). Achillion had two clinical stage medicines in development, including danicopan (ACH-4471/ALXN2040) and ACH-5228 (ALXN2050).

The acquisition of Achillion closed on January 28, 2020. Under the terms of the agreement, we acquired all outstanding common stock of Achillion for $6.30 per share, or an aggregate of $926.2, inclusive of the settlement of Achillion's outstanding equity awards. The acquisition was funded with cash on hand. The transaction includes the potential for additional consideration in the form of non-tradeable contingent value rights (CVRs), which will be paid to Achillion shareholders if certain clinical and regulatory milestones are achieved within specified periods. These include $1.00 per share for the U.S. Food and Drug Administration (FDA) approval of danicopan and $1.00 per share for the initiation of a Phase III clinical trial in ACH-5228.

The transaction was accounted for as a business combination. The following table summarizes the total consideration transferred to acquire Achillion and the estimated fair value of the identified assets acquired and liabilities assumed at the acquisition date:

Consideration
Upfront payment to shareholders and option holders	$	926.2
Upfront payment, fair value of equity compensation attributable to the post-combination service period	(20.0)
Upfront cash paid, net	906.2
Contingent consideration	160.7
Contingent consideration, fair value of equity compensation attributable to the post-combination service period	(5.7)
Total consideration	$	1,061.2
Assets Acquired and Liabilities Assumed
Cash and cash equivalents	$	68.5
Marketable securities	106.1
In-process research & development assets (IPR&D)	918.0
Goodwill	37.8
Deferred tax liabilities, net	(62.9)
Other assets and liabilities, net	(6.3)
Total net assets acquired	$	1,061.2

Our accounting for this acquisition was finalized during the second quarter of 2020. Measurement period adjustments increased goodwill by $3.1 during the second quarter of 2020 due to purchase price allocation increases to deferred tax liabilities, net. Measurement period adjustments were recorded as a result of studies completed during the second quarter of 2020 to determine the tax deductibility of certain acquisition-related costs and the valuation of historical net operating loss and income tax credit carryforwards.

The initial fair value estimate of the contingent consideration in the form of non-tradeable CVRs was $160.7, which was recorded as a noncurrent liability in our condensed consolidated balance sheets, including $5.7 related to compensation attributable to the post-combination service period. We determined the fair value of these milestone-related payment obligations using various estimates, including probabilities of success prior to expiration of the specified period, discount rates and the amount of time until the conditions of the milestone payments are expected to be met. This fair value measurement was based on significant inputs not observable in the market, representing Level 3 measurements within the fair value hierarchy. The resulting probability-weighted cash flows were discounted using a cost of debt rate ranging from 2.1% to 2.3%. The range of estimated milestone payments upon closing of the acquisition was from zero, if no milestones are achieved for any product, to $306.3 if certain development and regulatory milestones are achieved.

Subsequent to the acquisition date, we have adjusted the contingent consideration to fair value with changes in fair value recognized in operating earnings. Changes in fair values reflect new information about the probability and timing of meeting the conditions of the milestone payments. In the absence of new information, changes in fair value will only reflect the interest component of contingent consideration related to changes in the discount rates and the passage of time as development work progresses towards the potential achievement of the milestones. As of March 31, 2021, the fair value of the contingent consideration for the Achillion acquisition was $212.8 based on the probability-weighted cash flows, discounted using a cost of debt ranging from 2.5% to 3.0%. Changes in fair value of the contingent consideration associated with the Achillion acquisition for the three months ended March 31, 2021 and 2020, was $2.2 and $1.7, respectively.

The aggregate fair value of equity compensation attributable to the post-combination service period was $25.7. This amount was excluded from the total consideration transferred and was recognized as a charge to acquisition-related costs in our condensed consolidated statements of operations during the first quarter 2020. These amounts were associated with the accelerated vesting of stock options previously granted to Achillion employees. Excluding the $5.7 of contingent consideration related to equity compensation attributable to the post-combination service period, such amounts were paid during the first quarter 2020.

Intangible assets associated with IPR&D relate to two development-stage programs, ACH-4471 (ALXN2040) and ACH-5228 (ALXN2050). The estimated fair value of $918.0 was determined using the excess earnings valuation method, a variation of the income valuation approach. The excess earnings valuation method estimates the value of an intangible asset equal to the present value of the incremental after-tax cash flows attributable to that intangible asset. Some of the more significant assumptions utilized in our asset valuations included the estimated net cash flows for each asset, including net revenues, cost of sales, research and development and other operating expenses, the potential regulatory and commercial success rates, competitive trends impacting the assets, and tax rates. The fair value using the excess earnings valuation method was determined using an estimated weighted average cost of capital for Achillion of 11.5%, which represents a rate of return that a market participant would expect for these assets. These fair value measurements were based on significant inputs not observable in the market and thus represent Level 3 fair value measurements. In the second quarter 2020, we recognized an impairment charge of $11.0 to write off our ACHN-4471 (ALXN2040) IPR&D asset due to clinical results received during the quarter.

The excess of purchase price over the fair value of the assets acquired and liabilities assumed represents the goodwill resulting from the acquisition. The goodwill, which is not tax-deductible, has been recorded as a noncurrent asset and is not amortized, but is subject to an annual review for impairment. The factors that contributed to the recognition of goodwill include the value of the acquired workforce, synergies that are specific to our business and not available to market participants, and early research in preclinical Factor D inhibitors, as well as the effects of the establishment of a deferred tax liability for the acquired IPR&D intangible assets, which has no tax basis.

We recorded a net deferred tax liability of $62.9, inclusive of measurement period adjustments recorded during the second quarter 2020. This amount was primarily comprised of $205.3 of deferred tax liabilities relating to the IPR&D acquired, offset by $142.4 of deferred tax assets related to net operating loss carryforwards (NOLs), income tax credits, and other temporary differences.

Achillion's results of operations are included in the condensed consolidated financial statements from the date of acquisition. For the three months ended March 31, 2020, we recorded $13.9 of pre-tax operating losses associated with the operations of Achillion in our condensed consolidated statements of operations. We also recorded acquisition-related costs in connection with the acquisition during the three months ended March 31, 2020 as presented below. No revenues were recorded in the results of operations for the three months ended March 31, 2020 as neither ALXN2040 nor ALXN2050 has been approved for commercial sale by any regulatory agency.

Portola Pharmaceuticals, Inc.

In May 2020, Alexion entered into a definitive merger agreement to acquire Portola Pharmaceuticals, Inc. (Portola), a commercial-stage biopharmaceutical company focused on life-threatening blood-related disorders. Portola’s commercialized medicine, ANDEXXA®, marketed as ONDEXXYA® in Europe, is the first and only approved Factor Xa inhibitor reversal agent, and has demonstrated transformative clinical value by rapidly reversing the anticoagulant effects of Factor Xa inhibitors rivaroxaban and apixaban in severe and uncontrolled bleeding. The acquisition provides the opportunity to grow Alexion's commercial portfolio and is a strategic fit with our existing expertise in acute care, hematology and neurology.

Alexion completed the acquisition through a tender offer and subsequent merger of Portola which closed on July 2, 2020. Under the terms of the tender offer and merger agreement, Alexion purchased all outstanding common stock of Portola for $18.00 per share, or an aggregate of approximately $1,380.8, including the settlement of certain of Portola's outstanding equity awards but excluding shares of Portola stock held by Alexion at closing. The acquisition was funded by cash on hand.

Prior to the acquisition of Portola, in March 2020 and April 2020, we purchased $14.5 and $3.6, respectively, of common stock of Portola, which we recorded at fair value. Upon the closing of the acquisition of Portola, the fair value of the equity investment of $47.8 was derecognized and included in the fair value of consideration transferred. For additional information on our Portola equity investment, refer to Note 11, Other Investments.

The aggregate fair value of equity compensation attributable to the post-combination service period was $11.1. This amount was excluded from the total consideration transferred and was recognized as a charge to acquisition-related costs in our condensed consolidated statements of operations during the third quarter of 2020. These amounts were primarily associated with the accelerated vesting of stock options previously granted to Portola employees and were paid during the third quarter 2020.

We issued $41.5 of equity compensation replacement awards, of which the portion attributable to services performed prior to the acquisition date, or $7.2, was allocated to purchase consideration. The remaining fair value is attributable to future services and will be expensed as share-based compensation over the remaining service periods. Expense associated with the accelerated-vesting of the replacement awards in connection with employee terminations will be recognized as acquisition-related employee separation costs.

In connection with the acquisition, Alexion also paid $196.9 to settle certain debt held by Portola that was subject to preexisting change of control provisions.

The transaction was accounted for as a business combination. The following table summarizes the total consideration transferred to acquire Portola and the estimated fair value of the identified assets acquired and liabilities assumed at the acquisition date:

Consideration
Upfront payment to shareholders and equity holders	$	1,380.8
Upfront payment, fair value of equity compensation attributable to the post-combination service period	(11.1)
Upfront cash paid, net	1,369.7
Fair value of equity shares held by Alexion at closing	47.8
Fair value of replacement equity awards attributable to the pre-combination period	7.2
Total consideration to acquire outstanding equity, net	1,424.7
Total consideration to settle preexisting debt	196.9
Total consideration	$	1,621.6
Assets Acquired and Liabilities Assumed
Cash and cash equivalents	$	288.5
Marketable securities	17.8
Inventories, including noncurrent portion of $169.1 and validation batches of $60.9	362.5
Intangible assets	1,051.0
Goodwill	24.9
Deferred tax assets, net	116.6
Other assets	41.9
Accounts payable and accrued expenses	(75.6)
Long-term debt, including current portion of $7.7	(182.0)
Other liabilities	(24.0)
Total net assets acquired	$	1,621.6

Our accounting for this acquisition was finalized during the fourth quarter of 2020. Measurement period adjustments decreased goodwill by $0.6 during the fourth quarter of 2020 due to purchase price allocation increases to deferred tax assets, net. Measurement period adjustments were recorded as a result of studies completed during the fourth quarter of 2020 to determine the tax deductibility of certain acquisition-related costs and the valuation of historical net operating loss and income tax credit carryforwards.

We acquired $362.5 of ANDEXXA inventory, inclusive of $60.9 of validation batches manufactured under processes which are subject to regulatory approval and expected to be commercially saleable following approval. The estimated fair value of raw material inventory was valued at replacement cost, which is equal to the value a market participant would pay to acquire the inventory. The estimated fair value of work-in-process and finished goods inventory was based on the expected selling price of the inventory, adjusted for incremental costs to complete the

manufacturing process, for direct selling efforts, and for a normal profit on the remaining manufacturing and selling costs. Additionally, as the inventory acquired, inclusive of validation batches, is expected to be realized over a period of approximately 3 years, the fair value of the inventory was determined using a discount rate of 17.5%, representing the rate of return that a market participant would expect for the inventory, which shares risk that is similar to the underlying intellectual property. These fair value measurements were based on significant inputs not observable in the market and thus represent Level 3 fair value measurements. The acquired inventory, inclusive of the acquisition-date fair value step-up, will be expensed within cost of sales as the inventory is sold to customers. We classified the ANDEXXA inventory that is expected to be utilized beyond our normal operating cycle as a long-term asset. The fair value of the non-current portion of inventory, in addition to the validation batches, are classified within other assets in our condensed consolidated balance sheets.

Intangible assets consist of purchased technology of $1,036.0 and IPR&D of $15.0. The purchased technology intangible asset relates to Portola's lead product ANDEXXA. The estimated fair value was determined using the excess earnings valuation method, a variation of the income valuation approach. The excess earnings valuation method estimates the value of an intangible asset equal to the present value of the incremental after-tax cash flows attributable to that intangible asset. Some of the more significant assumptions utilized in our asset valuation included the estimated net cash flows for ANDEXXA, including net revenues, cost of sales, research and development and other operating expenses, the potential regulatory and commercial success rates associated with ANDEXXA's current conditional approval status and planned extension into the urgent surgery setting, competitive trends impacting the assets, and tax rates. The fair value using the excess earnings valuation method was determined using a discount rate commensurate with the risks of ANDEXXA of 17.5%, which represents a rate of return that a market participant would expect for the asset. The acquired purchased technology intangible asset is being amortized over an estimated useful life of approximately 10 years. IPR&D relates to the cerdulatinib development-stage asset. The estimated fair value of the IPR&D asset was determined using a relief from royalty (RFR) method, a variation of the income approach that is based on the cost savings that accrue to the owner of an intangible asset who would otherwise have to pay royalties on revenues earned through the use of the asset. The RFR method was modified to reflect the cash flow forecast of Portola's pre-existing in-license of cerdulatinib from Astellas Pharma, Inc. The acquired fair value of $15.0 represents an increase in the value of the asset relative to when it was initially in-licensed by Portola. Some of the more significant assumptions utilized in the IPR&D asset valuation included the estimated net revenue, royalty rate, and tax rates. The fair value using the RFR method was determined using an estimated discount rate commensurate with the risks of cerdulatinib of 17.5%, which represents a rate of return that a market participant would expect for the asset. These fair value measurements were based on significant inputs not observable in the market and thus represent Level 3 fair value measurements.

In connection with the acquisition, we assumed royalty-based debt which requires repayment through tiered royalties on future net worldwide sales of ANDEXXA. Total potential royalty payments are capped at $290.6, of which $13.7 were paid by Portola prior to the acquisition. The fair value of the remaining $276.9 in royalty-based payments as of the date of acquisition was $182.0. The estimated fair value was measured using Level 3 inputs and was calculated using a real options method, which runs simulations using various estimates, including probability-weighted net sales of ANDEXXA and volatility. Using the simulation results, the fair value was calculated based on the expected probability-weighted risk-neutral royalties, discounted at our estimated cost of debt, ranging from 3.3% to 7.1%, commensurate with the cost of debt at each period in which the royalty-based payments are estimated to be made.

We recorded net deferred tax assets of $116.6, inclusive of measurement period adjustments recorded during the fourth quarter 2020. This amount was primarily comprised of $301.6, $41.8, $42.4 and $39.3 of deferred tax assets relating to net operating loss carryforwards (NOLs), income tax credits, royalty-based debt, and other temporary differences, respectively, offset by $245.1 and $63.4 of deferred tax liabilities relating to intangible assets acquired and inventory fair value adjustments, respectively.

The excess of purchase price over the fair value of the assets acquired and liabilities assumed represents the goodwill resulting from the acquisition. The goodwill, which is not tax-deductible, has been recorded as a noncurrent asset and is not amortized, but is subject to an annual review for impairment. The factors that contributed to the recognition of goodwill primarily include the value of the acquired workforce and the effects of the establishment of a deferred tax liability for the fair value step-up of acquired inventory and intangible assets which exceed the incremental book value of acquired deferred tax assets over their fair value.

Pro forma financial information (unaudited)

The following unaudited pro forma information presents the combined results of Alexion and Achillion as if the acquisition of Achillion had been completed on January 1, 2019, with adjustments to give effect to pro forma events that are directly attributable to the acquisition. The unaudited pro forma results do not reflect operating efficiencies or potential cost savings that may have resulted from the consolidation of operations. Accordingly, the unaudited pro forma financial information is not necessarily indicative of the results of operations had we completed the transaction on January 1, 2019.

	Three months ended March 31,
	2020		2019
Pro forma revenue	$	1,444.8	$	1,140.4
Pro forma net income	$	574.9	$	515.7

The unaudited pro forma consolidated results include pro forma adjustments related to non-recurring activity. Alexion and Achillion acquisition-related costs of $53.3, net of tax, were excluded from income for the three months ended March 31, 2020. These expenses were included in net income for the three months ended March 31, 2019.

Acquisition-Related Costs

Acquisition-related costs recorded within the condensed consolidated statements of operations associated with our acquisitions of Achillion and Portola and our definitive merger agreement with AstraZeneca for the three months ended March 31, 2021 and 2020 include the following:

	Three months ended March 31
	2021		2020
Transaction costs (1)	$	5.4	$	1.4
Integration costs	4.1		0.1
Fair value of equity compensation attributable to the post-combination service period	—		25.7
Employee costs (2)	3.7		10.9
	$	13.2	$	38.1

(1) Transaction costs primarily include legal fees. First quarter 2020 transaction costs also include costs to effectuate the settlement of the Achillion outstanding options

(2) Employee separation costs include severance payments and costs associated with one-time short-term retention awards

Acquisition-related costs attributable to the Merger Agreement with AstraZeneca for the three months ended March 31, 2021 were $8.2. Acquisition-related costs attributable to the Portola acquisition for the three months ended March 31, 2021 were $5.0. Acquisition-related costs attributable to the Achillion acquisition for the three months ended March 31, 2020 were $38.1.

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Inventories

3 Months Ended

Mar. 31, 2021

Inventory, Net [Abstract]

Inventories

Inventories

The components of inventory are as follows:

	March 31,		December 31,
	2021		2020
Raw materials	$	97.8	$	91.2
Work-in-process	324.7		260.8
Finished goods	489.6		510.3
Total inventories	$	912.1	$	862.3
Balance Sheet Classification:
Inventories	$	803.9	$	775.7
Other assets	$	108.2	$	86.6

The acquired ANDEXXA inventory includes the acquisition-date fair value step-up, which is expensed within cost of sales as the inventory is sold to customers. For additional information on our acquisition of Portola, please refer to Note 3, Acquisitions.

We classify our inventory as long-term when we expect to utilize the inventory beyond our normal operating cycle and include these costs in other assets in our condensed consolidated balance sheets. Inventories classified as long-term relate to ULTOMIRIS 100mg/ml inventory and ANDEXXA inventory, including inventory acquired in connection with the Portola acquisition.

As of March 31, 2021 and December 31, 2020, the carrying value of capitalized inventory manufactured at production facilities and through manufacturing processes that have not yet received regulatory approval was $86.1 and $39.8, respectively. All such inventory as of March 31, 2021 received regulatory approval in April 2021.

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Intangible Assets and Goodwill

3 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Intangible Assets and Goodwill

Intangible Assets and Goodwill

The following table summarizes the carrying amount of our intangible assets and goodwill, net of accumulated amortization and impairment charges: 

		March 31, 2021							December 31, 2020
	Estimated Life (years)	Cost		Accumulated Amortization			Net		Cost		Accumulated Amortization			Net
Licensing rights	3-8	$	57.0	$	(39.4)		$	17.6	$	57.0	$	(38.5)		$	18.5
Patents	7	10.5		(10.5)			—		10.5		(10.5)			—
Purchased technology	6-16	5,746.5		(3,737.9)		(a)	2,008.6		5,746.5		(3,684.7)		(a)	2,061.8
Other intangibles	5	0.4		(0.3)			0.1		0.4		(0.3)			0.1
Priority review voucher	Indefinite	100.0		—			100.0		—		—			—
Acquired IPR&D	Indefinite	922.0		—			922.0		922.0		—			922.0
Total		$	6,836.4	$	(3,788.1)		$	3,048.3	$	6,736.4	$	(3,734.0)		$	3,002.4
Goodwill	Indefinite	$	5,103.0	$	(2.9)		$	5,100.1	$	5,103.0	$	(2.9)		$	5,100.1
(a) Includes an impairment charge of $2,042.3 recognized during the second quarter 2020 related to the KANUMA intangible asset

In January 2021, we entered into a definitive asset purchase agreement with Rhythm Pharmaceuticals, Inc. (“Rhythm”) to acquire its Rare Pediatric Disease Priority Review Voucher (PRV) for $100.0, inclusive of transaction costs. The acquisition of the PRV closed on February 17, 2021. As there is probable future economic benefit from the PRV, we capitalized the $100.0 payment as an indefinite-lived intangible asset.

Amortization expense for the three months ended March 31, 2021 and 2020 was $54.1 and $74.7, respectively. As of March 31, 2021, assuming no changes in the gross cost basis of intangible assets, the total estimated amortization expense for finite-lived intangible assets is $162.4 for the nine months ending December 31, 2021, and approximately $216.0 for each of the years ending December 31, 2022 through December 31, 2026.

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Debt

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

Debt

Debt

Credit Agreement

On June 7, 2018, we entered into an Amended and Restated Credit Agreement (the Credit Agreement), with Bank of America, N.A. as Administrative Agent. The Credit Agreement amended and restated our credit agreement dated as of June 22, 2015 (the Prior Credit Agreement).

The Credit Agreement provides for a $1,000.0 revolving credit facility and a $2,612.5 term loan facility. The revolving credit facility and the term loan facility mature on June 7, 2023. Beginning with the quarter ended June 30, 2019, we are required to make payments of 5.0% of the original principal amount of the term loan facility annually, payable in equal quarterly installments.

In connection with entering into the Credit Agreement and the Prior Credit Agreement, we paid an aggregate of $53.1 in financing costs in 2018. Financing costs are amortized as interest expense over the life of the debt. Amortization expense associated with deferred financing costs for the three months ended March 31, 2021 and 2020 was $1.2. Remaining unamortized deferred financing costs as of March 31, 2021 and December 31, 2020 were $9.9 and $11.1, respectively.

We made principal payments of $32.6 on the term loan during the three months ended March 31, 2021, and as of March 31, 2021, we had $2,351.3 outstanding on the term loan. We had no outstanding borrowings under the revolving credit facility as of March 31, 2021. As of March 31, 2021, we had open letters of credit of $1.0 that offset our availability in the revolving facility.

The amount outstanding under the term loan of $2,351.3 as of March 31, 2021 is subject to variable interest rates, which are based on current market rates, and as such, the Company believes the carrying amount of the obligation approximates fair value.

We were in compliance with all applicable covenants under the Credit Agreement as of March 31, 2021. In connection with the planned merger with AstraZeneca, we evaluated the terms of the Credit Agreement and determined the agreement could require acceleration of payments upon a change of control.

Royalty-based Financing

In connection with our acquisition of Portola during the third quarter 2020, we assumed royalty-based debt relating to a royalty sales agreement Portola had entered into with HealthCare Royalty Partners (HCR) whereby HCR acquired a tiered royalty interest in future worldwide net sales of ANDEXXA. Portola received $50.0 upon closing of the agreement in February 2017 and an additional $100.0 following the U.S. regulatory approval of ANDEXXA in May 2018. Tiered royalties ranging from 4.2% to 8.5% are required to be paid to HCR based on net worldwide sales of ANDEXXA. The applicable rate decreases as worldwide net annual sales levels increase above defined thresholds. Total potential royalty payments are capped at 195.0% of the funding received less certain transaction expenses, or $290.6. As of the date of acquisition, the remaining due to HCR was $276.9 in royalty-based payments.

We recorded the HCR debt at its fair value of $182.0 upon closing of the acquisition, representing an initial debt discount of $94.9. We have also recognized a deferred tax asset of $42.4 related to the royalty-based debt as of the acquisition date. For additional information on our acquisition of Portola, please refer to Note 3, Acquisitions. Interest expense is recognized using the effective interest rate method over the estimated period the related debt will be paid. This requires estimation of the timing and amount of future royalty payments to be generated from future sales of ANDEXXA. We reassess the expected royalty payments each reporting period and account for any changes through an adjustment to the effective interest rate on a prospective basis. The assumptions used in determining the expected repayment term of the debt require that we make estimates that could impact the short and long term classification of the debt carrying values.

Each period, we amortize the initial debt discount using the effective interest rate implied from the projected timing of royalty payments to HCR. The effective interest rate for the HCR royalty-based debt as of March 31, 2021 was 11.4%. During the three months ended March 31, 2021, we recognized interest expense associated with the amortization of the debt discount of $5.0. We made royalty-based debt payments of $3.3 during the three months ended March 31, 2021. As of March 31, 2021, the carrying value of the royalty-based debt includes approximately $2.5 of royalty payments on first quarter sales of ANDEXXA which will be paid during the second quarter of 2021.

As of March 31, 2021, the carrying value of the HCR royalty-based debt was $188.7, of which $16.3 was recorded within current portion of long-term debt and $172.4 was recorded within long-term debt, less current portion on our condensed consolidated balance sheets. As of December 31, 2020, the carrying value of the HCR royalty-

based debt was $187.0, of which $15.5 was recorded within current portion of long-term debt and $171.5 was recorded within long-term debt, less current portion on our condensed consolidated balance sheets.

Our payment obligations for HCR royalty-based debt are as follows:

	Three Months Ended March 31, 2021
Total repayment obligation as of December 31, 2020	$	271.9
Less: Interest to be accreted in future periods	(79.9)
Less: Payments made	(3.3)
Carrying value as of March 31, 2021	$	188.7

The carrying value of the royalty-based debt as of March 31, 2021 approximates fair value

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Earnings Per Common Share

3 Months Ended

Mar. 31, 2021

Earnings Per Common Share [Abstract]

Earnings Per Common Share

Earnings Per Common Share

Basic earnings per common share (EPS) is computed by dividing net income attributable to Alexion by the weighted-average number of shares of common stock outstanding attributable to Alexion. For purposes of calculating diluted EPS, the denominator reflects the potential dilution that could occur if stock options, unvested restricted stock units or other contracts to issue common stock were exercised or converted into common stock, using the treasury stock method.

The following table summarizes the calculation of basic and diluted EPS for the three months ended March 31, 2021 and 2020:

	Three months ended
	March 31,
	2021		2020
Net income attributable to Alexion	$	636.0	$	557.6
Shares used in computing earnings per common share attributable to Alexion —basic	220.1		221.6
Weighted-average effect of dilutive securities:
Stock awards	2.5		1.0
Shares used in computing earnings per common share attributable to Alexion —diluted	222.6		222.6
Earnings per common share attributable to Alexion:
Basic	$	2.89	$	2.52
Diluted	$	2.86	$	2.50

We exclude from EPS the weighted-average number of securities whose effect is anti-dilutive. Excluded from the calculation of EPS for the three months ended March 31, 2021 and 2020 were 0.8 and 3.2 shares of Alexion common stock, respectively, because their effect is anti-dilutive.

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Marketable Securities

3 Months Ended

Mar. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Marketable securities

Marketable SecuritiesThe proceeds from maturities and sales of available-for-sale debt securities and resulting realized gains and losses are summarized below. In the second quarter of 2020 we liquidated all of our available-for-sale securities and in the third quarter of 2020 we liquidated all available-for-sale debt securities acquired in connection with the Portola acquisition.

	Three months ended
	March 31,
	2021		2020
Proceeds from maturities and sales (1)	$	—	$	812.5
Realized gains	$	—	$	—
Realized losses	$	—	$	—
(1) Proceeds from maturities and sales of available-for-sale debt securities include securities previously classified as cash and cash equivalents and marketable securities in the condensed consolidated balance sheets.

We utilize the specific identification method in computing realized gains and losses.

As a result of our liquidation of all available-for-sale debt securities during 2020, we have no remaining available-for-sale debt securities as of March 31, 2021 and December 31, 2020.

We sponsor a nonqualified deferred compensation plan which allows certain highly compensated employees to elect to defer income to future periods. Participants in the plan earn a return on their deferrals based on several investment options, which mirror returns on underlying mutual fund investments. We choose to invest in the underlying mutual fund investments to offset the liability associated with our nonqualified deferred compensation plan. These mutual fund investments are valued at net asset value per share and are carried at fair value with gains and losses included in investment income. The changes in the underlying liability to the employee are recorded in operating expenses. As of March 31, 2021 and December 31, 2020, the fair value of these investments was $39.7 and $34.9, respectively.

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Derivative Instruments and Hedging Activities

3 Months Ended

Mar. 31, 2021

Derivative Instruments and Hedging Activities [Abstract]

Derivative Instruments and Hedging Activities

Derivative Instruments and Hedging Activities

We operate internationally and, in the normal course of business, are exposed to fluctuations in foreign currency exchange rates. The exposures result from portions of our revenues, as well as the related receivables, and expenses that are denominated in currencies other than the U.S. dollar, primarily the Euro and Japanese Yen. We are also exposed to fluctuations in interest rates on outstanding borrowings under our revolving credit facility, if any, and term loan facility. We manage these exposures within specified guidelines through the use of derivatives. All of our derivative instruments are utilized for risk management purposes, and we do not use derivatives for speculative trading purposes.

We enter into foreign exchange forward contracts to hedge exposures resulting from portions of our forecasted revenues, including intercompany revenues that are denominated in currencies other than the U.S. dollar. Revenue foreign exchange forward contracts in effect as of March 31, 2021 had durations of up to 23 months. The purpose of these hedges is to reduce the volatility of exchange rate fluctuations on our operating results. These hedges are designated as cash flow hedges upon contract inception. As of March 31, 2021, we had open revenue related foreign exchange forward contracts with notional amounts totaling $853.3 that qualified for hedge accounting with current contract maturities through June 2022.

To achieve a desired mix of floating and fixed interest rates on our term loan, we enter into interest rate swap agreements that qualify for and are designated as cash flow hedges. These contracts convert the floating interest rate on a portion of our debt to a fixed rate, plus a borrowing spread.

The following table summarizes the total interest rate swap contracts executed as of March 31, 2021:

Type of Interest Rate Swap Contract	Notional Amount	Effective Date	Termination Date	Fixed Interest Rate or Rate Range
Floating to Fixed	$450.0	December 2018	December 2022	2.60% - 2.79%
Floating to Fixed	$1,300.0	December 2019	December 2022	2.37% - 2.83%

The amount of gains and (losses) recognized in the condensed consolidated statements of operations for the three months ended March 31, 2021 and 2020 from foreign exchange and interest rate swap contracts that qualified as cash flow hedges were as follows:

	Three months ended				Three months ended
	March 31, 2021				March 31, 2020
Financial Statement Line Item in which the Effects of Cash Flow Hedges are Recorded	Net Product Sales		Interest Expense		Net Product Sales		Interest Expense
Total amount presented in the Condensed Consolidated Statements of Operations	$	1,635.7	$	(27.1)	$	1,444.6	$	(25.8)
Impact of cash flow hedging relationships:
Foreign exchange forward contracts	$	(11.8)	$	—	$	11.4	$	—
Interest rate contracts	$	—	$	(11.4)	$	—	$	(4.6)

The impact on accumulated other comprehensive income (AOCI) and earnings from foreign exchange and interest rate swap contracts that qualified as cash flow hedges, for the three months ended March 31, 2021 and 2020 were as follows:

	Three months ended
	March 31,
	2021		2020
Foreign Exchange Forward Contracts:
Gain recognized in AOCI, net of tax	$	33.4	$	26.0
(Loss) gain reclassified from AOCI to net product sales, net of tax	$	(9.1)	$	8.8
Interest Rate Swap Contracts:
Gain (loss) recognized in AOCI, net of tax	$	1.0	$	(47.3)
Loss reclassified from AOCI to interest expense, net of tax	$	(8.8)	$	(3.6)

Assuming no change in foreign exchange rates from market rates as of March 31, 2021, $9.7 of gains recognized in AOCI will be reclassified to revenue over the next 12 months. Assuming no change in LIBOR-based interest rates from market rates as of March 31, 2021, $45.7 of losses recognized in AOCI will be reclassified to interest expense over the next 12 months.

We enter into foreign exchange forward contracts designed to limit the balance sheet exposure of monetary assets and liabilities. We enter into these hedges to reduce the impact of fluctuating exchange rates on our operating results. Balance sheet hedges related to foreign exchange forward contracts in effect as of March 31, 2021 had durations of up to 3 months. Hedge accounting is not applied to these derivative instruments as gains and losses on these hedge transactions are designed to offset gains and losses on underlying balance sheet exposures. As of March 31, 2021, the notional amount of foreign exchange contracts where hedge accounting is not applied was $1,126.5.

We recognized a gain of $12.2 and $16.2, in other income and (expense) for the three months ended March 31, 2021 and 2020, respectively, associated with the foreign exchange contracts not designated as hedging instruments. These amounts were partially offset by gains or losses on monetary assets and liabilities.

The following tables summarize the fair value of outstanding derivatives as of March 31, 2021 and December 31, 2020: 

	March 31, 2021
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments:
Foreign exchange forward contracts	Prepaid expenses and other current assets	$	19.2	Other current liabilities	$	9.4
Foreign exchange forward contracts	Other assets	0.1		Other liabilities	—
Interest rate contracts	Prepaid expenses and other current assets	—		Other current liabilities	45.7
Interest rate contracts	Other assets	—		Other liabilities	32.9
Derivatives not designated as hedging instruments:
Foreign exchange forward contracts	Prepaid expenses and other current assets	22.3		Other current liabilities	12.2
Total fair value of derivative instruments		$	41.6		$	100.2

	December 31, 2020
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments:
Foreign exchange forward contracts	Prepaid expenses and other current assets	$	—	Other current liabilities	$	44.3
Foreign exchange forward contracts	Other assets	—		Other liabilities	1.2
Interest rate contracts	Prepaid expenses and other current assets	—		Other current liabilities	45.9
Interest rate contracts	Other assets	—		Other liabilities	45.4
Derivatives not designated as hedging instruments:
Foreign exchange forward contracts	Prepaid expenses and other current assets	26.1		Other current liabilities	35.8
Total fair value of derivative instruments		$	26.1		$	172.6

Although we do not offset derivative assets and liabilities within our condensed consolidated balance sheets, our International Swap and Derivatives Association agreements provide for net settlement of transactions that are due to or from the same counterparty upon early termination of the agreement due to an event of default or other termination event. The following tables summarize the potential effect on our condensed consolidated balance sheets of offsetting our foreign exchange forward contracts and interest rate contracts subject to such provisions:

	March 31, 2021
							Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet
Description	Gross Amounts of Recognized Assets/Liabilities		Gross Amounts Offset in the Condensed Consolidated Balance Sheet		Net Amounts of Assets/Liabilities Presented in the Condensed Consolidated Balance Sheet		Derivative Financial Instruments		Cash Collateral Received (Pledged)		Net Amount
Derivative assets	$	41.6	$	—	$	41.6	$	(21.3)	$	—	$	20.3
Derivative liabilities	$	(100.2)	$	—	$	(100.2)	$	21.3	$	—	$	(78.9)

	December 31, 2020
							Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet
Description	Gross Amounts of Recognized Assets/Liabilities		Gross Amounts Offset in the Condensed Consolidated Balance Sheet		Net Amounts of Assets/Liabilities Presented in the Condensed Consolidated Balance Sheet		Derivative Financial Instruments		Cash Collateral Received (Pledged)		Net Amount
Derivative assets	$	26.1	$	—	$	26.1	$	(26.1)	$	—	$	—
Derivative liabilities	$	(172.6)	$	—	$	(172.6)	$	26.1	$	—	$	(146.5)

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Caelum Biosciences

3 Months Ended

Mar. 31, 2021

Noncontrolling Interest [Abstract]

Caelum Biosciences

Caelum Biosciences

Background

In January 2019, we entered into an agreement with Caelum, a biotechnology company that is developing CAEL101 for light chain (AL) amyloidosis. Under the terms of the agreement, we acquired a minority equity interest in preferred stock of Caelum and an exclusive option to acquire the remaining equity in Caelum based on Phase II data, for pre-negotiated economics. We paid $30.0 in the first quarter 2019 and agreed to pay up to an additional $30.0 in contingent development milestones prior to the exercise of the option to acquire the remaining equity in Caelum. These contingent payments met the definition of a derivative liability and were initially recorded at fair value of $27.1, based on the probability-weighted cash flows, discounted using a cost of debt ranging from 3.3% to 3.5%. We allocated the total consideration of $57.1, inclusive of the fair value of the contingent payments, to the equity investment in Caelum and the option to acquire the remaining equity in Caelum based on the relative fair values of the assets.

Following discussions with the FDA, Caelum changed its clinical development plan for CAEL-101 in the fourth quarter 2019. In December 2019, we amended the terms of the agreement with Caelum to modify the option to acquire the remaining equity in Caelum based on data from the modified Phase II/III trials. The amendment also modified the development-related milestone events associated with the initial $30.0 in contingent payments, provided for an additional $20.0 in upfront funding, as well as funding of $60.0 in exchange for an additional equity interest at fair value upon achievement of a specific development-related milestone event.

In December 2019, we accounted for the amendment as an exchange transaction as the terms of the modified option were determined to be substantially different than the terms of the original option. In conjunction with this amendment, we recognized a gain of $32.0 during the fourth quarter 2019 in other income and (expense), which reflected an increase in the fair value of the option, less $20.0 in incremental upfront funding which we accrued as of December 31, 2019 and paid during the first quarter 2020, and $4.1 associated with the change in the fair value of contingent payments which we also modified as part of the amendment.

A Phase II trial for CAEL-101 subsequently commenced during the first quarter of 2020 and met its primary objectives, supporting the safety and tolerability of CAEL-101 and confirmed the dose and regimen to be adopted for the Phase III studies. In September 2020, Alexion and Caelum announced the initiation of the Cardiac Amyloid Reaching for Extended Survival (CARES) program. This includes two parallel Phase III trials to evaluate the survival benefits of CAEL-101.

In December 2020, in connection with entering into the Merger Agreement with AstraZeneca (refer to Note 1, Business), we determined that the fair value of our option to acquire the remaining equity of Caelum decreased as a result of a change to the expected option exercise date. This resulted in a $49.0 impairment charge which we recorded to investment income, net. The carrying value of the preferred stock was unaffected.

In March 2021, we amended the terms of our agreement with Caelum. The amended terms with Caelum modified the previously agreed upon funding of $60.0 in exchange for additional equity and included provisions to provide additional support to Caelum. Upon execution of the second amendment in March 2021, we provided $46.0 to Caelum in exchange for preferred equity and agreed to pay $14.0 upon achievement of a specified development milestone. We also committed to provide services to Caelum at no cost and to reimburse Caelum for costs incurred for incremental clinical trial activities that we requested be completed.

We continue to hold a minority equity interest in Caelum. Including the equity acquired in connection with the execution of the second amendment, we hold a 33.3% fully-diluted interest in Caelum as of March 31, 2021.

In the event we exercise the exclusive purchase option, the agreement provides for additional payments to Caelum for up to $500.0, which includes an upfront option exercise payment of $150.0 and potential regulatory and commercial milestone payments of up to $350.0. The pending acquisition of Alexion by AstraZeneca will accelerate the expiration period of the exclusive purchase option to 6-months after the close of the acquisition.

Our arrangement with Caelum, including through our preferred equity investments, provides Alexion the obligation to absorb losses and the right to receive benefits from Caelum. From the date of the initial agreement in January 2019 up until the date of the second amendment in March 2021, Caelum was not consolidated in our condensed consolidated financial statements as we did not have the power to direct the activities of Caelum that most significantly impact its economic performance, notably the completion of the clinical trials and activities to support regulatory approval of CAEL-101. As a result of the second amendment in March 2021, we became the primary beneficiary of Caelum and began consolidating Caelum as the incremental funding and support for clinical trial activities provides us the deemed power to direct the activities of Caelum that most significantly impact its economic performance.

Accounting for Caelum as a Consolidated VIE

Upon the initial consolidation of Caelum in March 2021, we recorded a $161.0 noncontrolling interest and derecognized our equity investment and purchase option of $41.0 and $15.0, respectively. Additionally, we recorded net assets of $217.0, comprised of cash and cash equivalents and other assets and liabilities, net in our condensed consolidated balance sheets. Caelum is a VIE that does not meet the definition of a business and as a result, no goodwill was recognized. The following table summarizes the assets acquired and liabilities assumed in connection with the consolidation of Caelum:

Assets Acquired and Liabilities Assumed
Cash and cash equivalents	$	16.9
Acquired in-process research and development	193.3
Other assets and liabilities, net	6.8
Total net assets acquired	$	217.0

Substantially all of the fair value of the gross assets of Caelum is concentrated in a single in-process research and development asset, CAEL-101. Due to the stage of development of this asset at the date of consolidation, significant risk remained and it was not yet probable that there was future economic benefit from this asset. Absent successful clinical results and regulatory approval for the asset, there is no alternative future use associated with CAEL-101. Accordingly, the value of this asset was expensed during the first quarter of 2021.

Caelum net loss included in our condensed consolidated statements of operations was $196.0, including acquired in-process research and development of $193.3, for the three months ended March 31, 2021, of which

$146.8 was attributed to the noncontrolling interest. The carrying value of the assets and liabilities associated with Caelum included in the condensed consolidated balance sheets as of March 31, 2021, which are limited in use for its operations and do not have recourse against our general credit are as follows:

	March 31, 2021
Cash and cash equivalents	$	56.5
Prepaid expenses and other current assets	$	8.6
Other assets	$	7.8
Accounts payable	$	3.6
Accrued expenses	$	2.3

Accounting for Caelum Prior to Consolidation

Prior to our consolidation of Caelum in March 2021, we recognized our equity investment in Caelum and the option to acquire the remaining equity in Caelum within other assets in our condensed consolidated balance sheets. As our equity investment in Caelum and option to acquire the remaining equity in Caelum did not have readily determinable fair values, we only adjusted the carrying value of the assets for impairment and any subsequent changes resulting from an observable price change in an orderly transaction for identical or similar equity securities of the same issuer. There were no observable price changes or impairments associated with these assets during the three months ended March 31, 2021 prior to consolidation or during the three months ended March 31, 2020.

In addition to our equity investment, we recognized the $30.0 in contingent development milestones at fair value as a derivative liability during 2020. We paid the associated development milestones in the second and third quarters of 2020 and as a result reduced the derivative liability balance to zero. Each reporting period, we adjusted the derivative liability associated with the contingent payments to fair value with changes in fair value recognized in other income and (expense). Changes in fair values reflected new information about the probability and anticipated timing of meeting the conditions of the milestone payments. In the absence of new information, changes in fair value reflected the interest component of the liability related to the passage of time. We recorded $2.3 of expense in other income and (expense) during the three months ended March 31, 2020 related to the change in the fair value of the liability. No expense was recognized during the three months ended March 31, 2021 as the derivative liability was previously settled.

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Other Investments

3 Months Ended

Mar. 31, 2021

Investments, All Other Investments [Abstract]

Other Investments

Other Investments    

Other investments include strategic investments in equity securities of certain biotechnology companies which we acquired in connection with strategic business development transactions, including license and option agreements. These investments are included in other assets in our condensed consolidated balance sheets.

Dicerna

In October 2018, we purchased $10.3 of Dicerna Pharmaceuticals Inc. (Dicerna) common stock in connection with an agreement that we entered into with Dicerna, a publicly-traded biopharmaceutical company. As our equity investment in Dicerna common stock has a readily determinable fair value, we are recording the investment at fair value. During the three months ended March 31, 2021 and 2020, we recognized an unrealized gain of $3.0 and unrealized loss of $3.1, respectively, in investment income to adjust our equity investment in Dicerna to fair value.

The fair value of this investment was $21.4 and $18.4 as of March 31, 2021 and December 31, 2020, respectively.

Zealand

In March 2019, we purchased $13.8 (Kr. 90.9) of Zealand Pharma A/S (Zealand) common stock in connection with an agreement that we entered into with Zealand, a publicly-traded biopharmaceutical company based in Copenhagen, Denmark. Refer to Note 17, Commitments and Contingencies, for additional information on the agreement. As our equity investment in Zealand common stock has a readily determinable fair value, we are recording the investment at fair value. During the three months ended March 31, 2021 and 2020, we recognized an unrealized loss of $2.5 and $0.2, respectively, in investment income to adjust our equity investment in Zealand to fair value.

The fair value of this investment was $25.4 and $29.1 as of March 31, 2021 and December 31, 2020, respectively.

BridgeBio (Eidos)

In September 2019, we purchased $19.9 of Eidos Therapeutics, Inc. (Eidos) common stock, in connection with an agreement that we entered into with Eidos, a publicly-traded biopharmaceutical company and subsidiary of BridgeBio Pharma, Inc. Refer to Note 17, Commitments and Contingencies, for additional information on the agreement. In January 2021, BridgeBio Pharma, Inc. (BridgeBio) completed its acquisition of all the outstanding shares of Eidos common stock that BridgeBio did not already own at which time we received 1.85 shares of BridgeBio common stock for each share of Eidos common stock previously held. As our equity investment in BridgeBio common stock has a readily determinable fair value, we are recording the investment at fair value. During the three months ended March 31, 2021 and 2020, we recognized an unrealized loss of $9.8 and $3.7, respectively, in investment income to adjust our equity investment in BridgeBio (formerly Eidos) to fair value.

The fair value of this investment was $63.4 and $73.2 as of March 31, 2021 and December 31, 2020, respectively.

Portola

In March 2020 and April 2020, we purchased $14.5 and $3.6, respectively, of common stock of Portola Pharmaceuticals, Inc., a publicly traded commercial-stage biological company which we acquired on July 2, 2020. As our equity investment in Portola common stock had a readily determinable fair value, we recorded the investment at fair value. During the three months ended March 31, 2020, we recognized an unrealized gain of $0.6, in investment income to adjust our equity investment in Portola to fair value. Upon the closing of the acquisition of Portola on July 2, 2020, the fair value of the equity investment of $47.8 was derecognized and included in the fair value of consideration transferred, resulting in a realized gain of $29.7 in investment income on our initial investment. Refer to Note 3, Acquisitions, for additional information.

Inozyme

On July 17, 2020, we sold certain intellectual property rights and assets focusing on ENPP1 gene deficiencies to Inozyme Pharma (Inozyme), a publicly traded biopharmaceutical company, in exchange for $14.8 of Inozyme Pharma common stock, which was initially recorded at its IPO offering price, net of the effects of a nine month holding period restriction. We recognized the $14.8 of consideration received as a gain within gain on sale of assets in our condensed consolidated statements of operations in the third quarter of 2020. As our equity investment in Inozyme common stock has a readily determinable fair value, we are recording the investment at fair value. We have considered the effects of the holding period restriction and determined that the impact on the fair value of the investment is immaterial as of March 31, 2021. During the three months ended March 31, 2021, we recognized an unrealized gain of $1.5, in investment income to adjust our investment in Inozyme to fair value.

The fair value of this investment was $22.0 and $20.5 as of March 31, 2021 and December 31, 2020, respectively.

Other Strategic Investments

We have other strategic investments in equity securities of $5.8 and $2.6 as of March 31, 2021 and December 31, 2020, respectively. During the three months ended March 31, 2021 and 2020, purchases relating to these investments were immaterial and we recognized immaterial losses in investment income related to these investments.

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Stockholders' Equity

3 Months Ended

Mar. 31, 2021

Equity [Abstract]

Stockholders' Equity

Stockholders' Equity

Share Repurchases

In November 2012, our Board of Directors authorized a share repurchase program. In February 2017, our Board of Directors increased the amount that we are authorized to expend on future repurchases to $1,000.0 under our repurchase program, which superseded all prior repurchase programs. The entire amount authorized pursuant to this February 2017 Board approval has been utilized. On October 22, 2019, the Board of Directors approved a share repurchase authorization of up to $1,000.0. On July 28, 2020, the Board of Directors approved a new share repurchase authorization of up to an additional $1,500.0. The repurchase program does not have an expiration date and we are not obligated to acquire a particular number of shares. The repurchase program may be discontinued at any time at our discretion. We did not repurchase shares of our common stock during the three months ended March 31, 2021. Under the program, we repurchased 1.3 shares of our common stock at a cost of $107.1 during the three months ended March 31, 2020. As of March 31, 2021, there is a total of $2,024.7 remaining for repurchases under the repurchase programs.

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Other Comprehensive Income and Accumulated Other Comprehensive Income

3 Months Ended

Mar. 31, 2021

Accumulated Other Comprehensive Income [Abstract]

Other Comprehensive Income and Accumulated Other Comprehensive Income

Other Comprehensive Income and Accumulated Other Comprehensive Income

The following tables summarize the changes in AOCI, by component, for the three months ended March 31, 2021 and 2020:

	Defined Benefit Pension Plans		Unrealized Gains (Losses) from Debt Securities		Unrealized Gains (Losses) from Hedging Activities		Foreign Currency Translation Adjustment		Total Accumulated Other Comprehensive Income (Loss)
Balances, December 31, 2020	$	(10.2)	$	—	$	(102.7)	$	(11.7)	$	(124.6)
Other comprehensive income (loss) before reclassifications	—		—		34.6		(13.1)		21.5
Amounts reclassified from other comprehensive income	—		—		17.9		—		17.9
Net other comprehensive income (loss)	—		—		52.5		(13.1)		39.4
Balances, March 31, 2021	$	(10.2)	$	—	$	(50.2)	$	(24.8)	$	(85.2)

	Defined Benefit Pension Plans		Unrealized Gains (Losses) from Debt Securities		Unrealized Gains (Losses) from Hedging Activities		Foreign Currency Translation Adjustment		Total Accumulated Other Comprehensive Income (Loss)
Balances, December 31, 2019	$	(9.2)	$	(0.1)	$	(40.1)	$	(17.4)	$	(66.8)
Other comprehensive income (loss) before reclassifications	—		(0.2)		(21.3)		(8.0)		(29.5)
Amounts reclassified from other comprehensive income	—		—		(5.2)		—		(5.2)
Net other comprehensive income (loss)	—		(0.2)		(26.5)		(8.0)		(34.7)
Balances, March 31, 2020	$	(9.2)	$	(0.3)	$	(66.6)	$	(25.4)	$	(101.5)

The table below provides details regarding significant reclassifications from AOCI during the three months ended March 31, 2021 and 2020:

Details about Accumulated Other Comprehensive Income Components	Amount Reclassified From Accumulated Other Comprehensive Income during the three months ended March 31,				Affected Line Item in the Condensed Consolidated Statements of Operations
	2021		2020
Unrealized Gains (Losses) on Hedging Activity
Foreign exchange forward contracts	$	(11.8)	$	11.4	Net product sales
Interest rate contracts	(11.4)		(4.6)		Interest expense
	(23.2)		6.8
	5.3		(1.6)		Income tax expense
	$	(17.9)	$	5.2

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Fair Value Measurement

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Fair Value Measurement

Fair Value Measurement

Authoritative guidance establishes a valuation hierarchy for disclosure of the inputs to the valuation used to measure fair value. This hierarchy prioritizes the inputs into three broad levels as follows. Level 1 inputs are quoted prices (unadjusted) in active markets for identical assets or liabilities. Level 2 inputs are quoted prices for similar assets and liabilities in active markets or inputs that are observable for the asset or liability, either directly or indirectly through market corroboration, for substantially the full term of the financial instrument. Level 3 inputs are unobservable inputs based on our own assumptions used to measure assets and liabilities at fair value.

The following tables present information about our assets and liabilities that are measured at fair value on a recurring basis as of March 31, 2021 and December 31, 2020, and indicate the fair value hierarchy of the valuation techniques we utilized to determine such fair value.

		Fair Value Measurement as of March 31, 2021
Balance Sheet Classification	Type of Instrument	Total		Level 1		Level 2		Level 3
Cash equivalents	Money market funds	$	1,258.8	$	—	$	1,258.8	$	—
Marketable securities	Mutual funds	$	39.7	$	39.7	$	—	$	—
Other assets	Equity securities	$	137.4	$	137.4	$	—	$	—
Prepaid expenses and other current assets	Foreign exchange forward contracts	$	41.5	$	—	$	41.5	$	—
Other assets	Foreign exchange forward contracts	$	0.1	$	—	$	0.1	$	—
Other current liabilities	Foreign exchange forward contracts	$	21.6	$	—	$	21.6	$	—
Other current liabilities	Interest rate contracts	$	45.7	$	—	$	45.7	$	—
Other liabilities	Interest rate contracts	$	32.9	$	—	$	32.9	$	—
Current portion of contingent consideration	Acquisition-related contingent consideration	$	120.0	$	—	$	—	$	120.0
Contingent consideration	Acquisition-related contingent consideration	$	303.5	$	—	$	—	$	303.5

		Fair Value Measurement as of December 31, 2020
Balance Sheet Classification	Type of Instrument	Total		Level 1		Level 2		Level 3
Cash equivalents	Money market funds	$	833.7	$	—	$	833.7	$	—
Marketable securities	Mutual funds	$	34.9	$	34.9	$	—	$	—
Other assets	Equity securities	$	143.2	$	122.7	$	20.5	$	—
Prepaid expenses and other current assets	Foreign exchange forward contracts	$	26.1	$	—	$	26.1	$	—
Other current liabilities	Foreign exchange forward contracts	$	80.1	$	—	$	80.1	$	—
Other liabilities	Foreign exchange forward contracts	$	1.2	$	—	$	1.2	$	—
Other current liabilities	Interest rate contracts	$	45.9	$	—	$	45.9	$	—
Other liabilities	Interest rate contracts	$	45.4	$	—	$	45.4	$	—
Current portion of contingent consideration	Acquisition-related contingent consideration	$	114.9	$	—	$	—	$	114.9
Contingent consideration	Acquisition-related contingent consideration	$	299.4	$	—	$	—	$	299.4

There were no securities transferred between Level 1, 2 and 3 during the three months ended March 31, 2021.

Valuation Techniques

We classify mutual fund investments and equity securities, which are valued based on quoted market prices in active markets with no valuation adjustment, as Level 1 assets within the fair value hierarchy.

Cash equivalents classified as Level 2 within the valuation hierarchy relate to money market funds. The fair value of our money market funds was determined through third-party pricing sources.

Other investments in equity securities of publicly traded companies which are subject to holding period restrictions are carried at fair value using an option pricing valuation model and classified as Level 2 equity securities within the fair value hierarchy. The most significant assumptions within the option pricing valuation model are the term of the restrictions and the stock price volatility, which is based upon the historical volatility of the applicable company or similar companies. We also use a constant maturity risk-free interest rate to match the remaining term of the restrictions on such investments.

Our derivative assets and liabilities include foreign exchange and interest rate derivatives that are measured at fair value using observable market inputs such as forward rates, interest rates, our own credit risk as well as an evaluation of our counterparties’ credit risks. Based on these inputs, the derivative assets and liabilities are classified within Level 2 of the valuation hierarchy.

Contingent consideration liabilities related to business acquisitions are classified as Level 3 within the valuation hierarchy and are valued based on various estimates, including probability of success, discount rates and amount of time until the conditions of the milestone payments are met.

As of March 31, 2021, there has not been any impact to the fair value of our derivative liabilities due to our own credit risk. Similarly, there has not been any significant adverse impact to our derivative assets based on our evaluation of our counterparties’ credit risks.

Acquisition-Related Contingent Consideration

In connection with our prior business combinations, we may be required to pay future consideration that is contingent upon the achievement of specified development, regulatory approvals or sales-based milestone events. We determine the fair value of these obligations using various estimates that are not observable in the market and represent a Level 3 measurement within the fair value hierarchy. As of March 31, 2021, the resulting probability-weighted cash flows were discounted using a cost of debt ranging from 2.5% to 3.0% for developmental and regulatory milestones and a weighted average cost of capital of 9.0% for sales-based milestones. As of December 31, 2020, the resulting probability-weighted cash flows were discounted using a cost of debt ranging from 2.8% to 3.3% for developmental and regulatory milestones and a weighted average cost of capital of 9.0% for sales-based milestones.

Each reporting period, we adjust the contingent consideration to fair value with changes in fair value recognized in operating income. Changes in fair values reflect new information about the probability and timing of meeting the conditions of the milestone payments. In the absence of new information, changes in fair value will only reflect the interest component of contingent consideration related to changes in discount rates and the passage of time.

As of March 31, 2021, estimated future contingent milestone payments related to our business combinations range from zero if no milestone events are achieved, to a maximum of $905.6 if all development, regulatory and sales-based milestones are reached. In the first quarter of 2021, a sales-based milestone associated with our acquisition of Enobia Pharma Corp. was achieved. In connection with such achievement, we will make a $120.0 milestone payment in the second quarter of 2021. No additional milestone payments associated with our prior business combinations are expected during the next 12 months. As of March 31, 2021, the fair value of acquisition-related contingent consideration was $423.5. The following table represents a roll-forward of our acquisition-related contingent consideration:

	Three Months Ended March 31, 2021
Balance as of December 31, 2020	$	414.3
Changes in fair value	9.2
Balance as of March 31, 2021	$	423.5

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Revenue Recognition

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Abstract]

Revenue Recognition

Revenue Recognition

Disaggregation of Revenue

The Company disaggregates revenue from contracts with customers into product and geographical regions as summarized below.

	Three months ended March 31,
	2021		2020
SOLIRIS
United States	$	553.9	$	556.2
Europe	251.3		263.5
Asia Pacific	102.4		87.1
Rest of World	120.0		116.1
Total	$	1,027.6	$	1,022.9
ULTOMIRIS
United States	$	206.9	$	131.5
Europe	63.8		33.8
Asia Pacific	73.3		57.1
Rest of World	2.9		0.4
Total	$	346.9	$	222.8
STRENSIQ
United States	$	155.2	$	128.1
Europe	18.9		24.0
Asia Pacific	17.0		13.6
Rest of World	6.4		6.5
Total	$	197.5	$	172.2
ANDEXXA
United States	$	25.3	$	—
Europe	3.6		—
Asia Pacific	—		—
Rest of World	—		—
Total	$	28.9	$	—
KANUMA
United States	$	17.1	$	16.4
Europe	10.8		7.5
Asia Pacific	1.2		0.9
Rest of World	5.7		1.9
Total	$	34.8	$	26.7
Total Net Product Sales	$	1,635.7	$	1,444.6

Contract Balances and Receivables

Contract liabilities primarily relate to consideration received and/or billed for goods that have not been delivered to the customer and for which the performance obligation has not yet been completed. These amounts are included within other current liabilities in the condensed consolidated balance sheets.

The following table provides information about receivables and contract liabilities from our contracts with customers.

	March 31, 2021		December 31, 2020
Receivables, which are included in "Trade accounts receivable, net"	$	1,473.0	$	1,409.3
Contract liabilities, which are included in "Other current liabilities"	$	23.8	$	3.0

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Income Taxes

3 Months Ended

Mar. 31, 2021

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

Tax Rate

The following table provides a comparative summary of our income tax expense and effective income tax rate for the three months ended March 31, 2021:

	Three months ended
	March 31,
	2021			2020
Income tax expense	$	113.4		$	106.0
Effective income tax rate	18.8		%	16.0		%

Income tax expense is attributable to the U.S. federal, state and foreign income taxes on our profitable operations. The increase in the effective tax rate for the three months ended March 31, 2021 as compared to the same period in the prior year is primarily attributable to the consolidation of Caelum during the first quarter 2021. Caelum's net loss included in our condensed consolidated statement of operations for the three months ended March 31, 2021 was $196.0, including acquired in-process research and development expense of $193.3, for which no tax benefit has been recognized. This resulted in an increase to the effective tax rate of 5.2% for the three months ended March 31, 2021.

In April 2020 we became aware of a European withholding tax regulation that could be interpreted to apply to certain of our previous intra-group transactions. We recorded an immaterial reserve related to this matter during the second quarter of 2020.

We have recorded tax on the undistributed earnings of our controlled foreign corporation (CFC) subsidiaries. To the extent CFC earnings may not be repatriated to the U.S. as a dividend distribution due to limitations imposed by law, we have not recorded the related potential withholding, foreign, local, and U.S. state income taxes.

We continue to maintain a valuation allowance when it is more likely than not that all or a portion of certain deferred tax assets will not be realized.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2021

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Asset Acquisition and In-License Agreements

We have entered into asset purchase agreements, license agreements, and option arrangements in order to advance and obtain technologies and services related to our business. These agreements generally require us to pay an initial fee and certain agreements call for future payments upon the attainment of agreed upon development, regulatory and/or commercial milestones. These agreements may also require minimum royalty payments based on sales of products developed from the applicable technologies, if any. Refer to Note 10, Caelum Biosciences, for information on commitments and additional payments that may be required in connection with our agreement with Caelum, which has been consolidated as a variable interest entity in our condensed consolidated balance sheets.

In March 2019, we entered into an agreement with Zealand which provides us with exclusive worldwide licenses, as well as development and commercial rights, for subcutaneously delivered preclinical peptide therapies

directed at up to four complement pathway targets. Pursuant to the agreement, Zealand will lead joint discovery and research efforts through the preclinical stage, and Alexion will lead development efforts beginning with the investigational new drug filing and Phase I studies. In addition to the agreement, we made an equity investment in Zealand (refer to Note 11, Other Investments). Under the terms of the agreement, we made an upfront payment of $40.0 for an exclusive license to the lead target and the equity investment, as well as for preclinical research services to be performed by Zealand in relation to the lead target. The market value of the equity investment was $13.8 as of the date of acquisition, which we recorded in other assets in our condensed consolidated balance sheets. We also recognized prepaid research and development expense of $5.0 within the condensed consolidated balance sheets associated with the research activities to be performed by Zealand. Due to the early stage of the asset we are licensing, we recorded the upfront license payment of $21.2 as research and development expense during the first quarter 2019. As of March 31, 2021, we could be required to pay up to $610.0, for the lead target, upon the achievement of specified development, regulatory and commercial milestones, as well as royalties on commercial sales. In addition, we could be required to pay up to an additional $115.0 in development and regulatory milestones if both a long-acting and short-acting product are developed with respect to the lead target. Each of the three subsequent targets can be selected for an option fee of $15.0 and has the potential for additional development, regulatory and commercial milestones, as well as royalty payments, at a reduced price to the lead target.

In September 2019, we entered into an agreement with Eidos through which Alexion obtained an exclusive license to develop and commercialize AG10 in Japan. AG10 is a small molecule designed to treat the root cause of transthyretin amyloidosis (ATTR) and is currently in a Phase III study in the U.S., Europe and Japan for ATTR cardiomyopathy (ATTR-CM). In addition, we made an equity investment in Eidos (refer to Note 11, Other Investments). Under the terms of the agreement, we made an upfront payment of $50.0 for the exclusive license to AG10 in Japan and the equity investment. The market value of the equity investment was $19.9 as of the date of acquisition, which we recorded in other assets in our condensed consolidated balance sheets. Due to the early stage of the asset we are licensing, we recorded the upfront license payment of $30.1 as research and development expense during the third quarter 2019. In January 2021, BridgeBio completed its acquisition of all the outstanding shares of Eidos common stock that BridgeBio did not already own. As of March 31, 2021, we could be required to pay $30.0 upon achievement of a Japanese-based regulatory milestone as well as royalties on commercial sales.

In October 2018, we entered into a collaboration agreement with Dicerna that provides us with exclusive worldwide licenses and development and commercial rights for two preclinical RNA interference (RNAi) subcutaneously delivered molecules for complement-mediated diseases, as well as an exclusive option for other preclinical RNAi molecules for two additional targets within the complement pathway. In addition to the collaboration agreement, we made an equity investment in Dicerna. Under the terms of the agreements, we made an upfront payment of $37.0 for the exclusive licenses and the equity investment. The market value of the equity investment was $10.3 as of the date of acquisition, which we recorded in other assets in our condensed consolidated balance sheets. Due to the early stage of the assets we are licensing, we recorded the upfront license payment of $26.7 as research and development expense during the fourth quarter 2018. In December 2019, we exercised our option for exclusive rights to two additional targets within the complement pathway under an existing agreement with Dicerna, which expands our existing research collaboration and license agreement with Dicerna to include a total of four targets within the complement pathway. In connection with the option exercise, we paid Dicerna $20.0, which we recorded as research and development expense in the fourth quarter 2019. As of March 31, 2021, we could be required to pay up to $604.1 for amounts due upon the achievement of specified research, development, regulatory and commercial milestones on the four licensed targets, as well as royalties on commercial sales.

In December 2017, we entered into a collaboration and license agreement with Halozyme Therapeutics, Inc. that allows us to use drug-delivery technology in the development of subcutaneous formulations for our portfolio of products for up to four targets. Under the terms of the agreement, we made an upfront payment of $40.0 for an exclusive license to two of the four potential targets and due to the early stage of the assets we are licensing, we recorded an expense for the upfront payment during the fourth quarter 2017. During the second quarter 2020, we forfeited our rights to one of the two targets we initially licensed. As of March 31, 2021, we could be required to pay up to $155.0 for the remaining licensed target upon achievement of specified development, regulatory and sales-based milestones, as well as royalties on commercial sales. Each of the two subsequent targets can be licensed for an option fee of $8.0, with contingent payments of up to $160.0 per target, subject to development, regulatory and commercial milestones, as well as royalties on commercial sales.

In connection with our prior acquisition of Syntimmune, Inc., a clinical-stage biotechnology company developing an antibody therapy targeting the FcRn, we could be required to pay up to $800.0 upon the achievement of specified development, regulatory and commercial milestones, of which $130.0 is specific to the subcutaneous formulation. We are currently subject to a claim in litigation in connection with the Syntimmune acquisition alleging that Alexion failed to meet its obligations under the merger agreement to use commercially reasonable efforts to achieve the milestones and plaintiff has requested payment of the full earn-out amount.

In addition, as of March 31, 2021, we have other license agreements under which we may be required to pay up to an additional $114.1 for currently licensed targets, if certain development, regulatory and commercial milestones are met, including up to $71.5 for the development of cerdulatinib in multiple indications pursuant to an in-licensing agreement with Astellas Pharma, Inc. which was assumed through the acquisition of Portola in the third quarter 2020. Additional amounts may be payable if we elect to acquire licenses to additional targets, as applicable, under the terms of these agreements.

During the next 12 months, we may incur milestone payments related to our asset acquisitions, option and in-license agreements of approximately $155.1 as of March 31, 2021, inclusive of $14.0 of potential milestone payments due to Caelum, which has been consolidated as a variable interest entity as of the first quarter 2021. Additionally, in the event we exercise the exclusive purchase option with Caelum, the agreement provides for additional payments to Caelum for up to $500.0, which includes an upfront option exercise payment of $150.0 and potential regulatory and commercial milestone payments of up to $350.0. The pending acquisition of Alexion by AstraZeneca will accelerate the expiration period of the exclusive purchase option to 6-months after the close of the acquisition.

Asset Sale and Out-License Arrangements

In connection with prior asset sale and out-license arrangements, including those assumed by Alexion through prior acquisitions, Alexion is entitled to receive contingent payments upon the achievement of various regulatory and commercial milestones and other events, as well as royalties on commercial sales. Income resulting from contingent milestone payments and royalties on commercial sales is generally recognized when the contingent consideration is probable and no longer constrained. Additionally, sales-based milestones and royalties on commercial sales resulting from an out-license arrangement are subject to the sales-and-usage based royalty scope exception and recognized only when the associated sales occur.

In September 2018, we sold all assets, rights and obligations of the ALXN1101 program to Origin Biosciences, Inc. (Origin) and, as a result, recognized a gain of $3.5 during the third quarter 2018. Under the terms of the agreement with Origin, Alexion is entitled to receive contingent payments upon the achievement of various regulatory and commercial milestones, including Origin’s receipt of a PRV, as well as royalties on commercial sales. In the first quarter of 2021, ALXN1101, now branded as NULIBRY™ (fosdenopterin), received approval from the FDA. Origin also received a PRV in connection with this approval. As a result, we recognized income of $20.0 in gain on sale of assets in the condensed consolidated statements of operations for the three months ended March 31, 2021. This income primarily represents the change in our estimate of variable consideration expected to be received under this contract. Additional rights to receive contingent payments of approximately $21.0 upon certain contingent milestone events, as well as royalties on sales of NULIBRY™, remain fully constrained given the significant uncertainty in realizing any such amounts.

The amount of contingent consideration related to our other asset sale and out-license agreements is fully constrained and therefore has not been recognized as of March 31, 2021.

Manufacturing Agreements

We have various manufacturing development and license agreements to support our clinical and commercial product needs.

We rely on Lonza, a third party manufacturer, to produce a portion of commercial and clinical quantities of our commercial products and product candidates. We have various manufacturing and license agreements with Lonza, with remaining total non-cancellable future commitments of approximately $1,432.1 through 2030. This amount includes $97.9 of undiscounted, fixed payments applicable to our Contract Manufacturing Organization (CMO) embedded lease arrangement with Lonza. If we terminate certain supply agreements with Lonza without cause, we will be required to pay for product scheduled for manufacture under our arrangement. Under an existing arrangement with Lonza, we pay Lonza a royalty on the sales of SOLIRIS and ULTOMIRIS manufactured at Lonza facilities.

In addition to our commitments with Lonza, as of March 31, 2021 we have non-cancellable commitments of approximately $125.7 through 2023 with other third party manufacturers.

Contingent Liabilities

We are currently involved in various claims, disputes, lawsuits, investigations, administrative proceedings and legal proceedings. On a quarterly basis, we review the status of each significant matter and assess its potential financial exposure. In accordance with generally accepted accounting principles, if the potential loss from any claim, asserted or unasserted, or legal proceeding is considered probable and the amount can be reasonably estimated, we accrue a liability for the estimated loss. Because of uncertainties related to claims, proceedings and litigation, accruals are based on our best estimates based on information available at the time of the assessment. On a periodic basis, as additional information becomes available, or based on specific events such as the outcome of litigation, court decisions or settlement of claims (and offers of settlement), we may reassess the potential liability related to these matters and may revise these estimates, which could result in a material adverse adjustment to our operating results. Costs associated with our involvement in legal proceedings are expensed as incurred. The outcome of any such proceedings, regardless of the merits, is inherently uncertain. If we were unable to prevail in any such proceedings, our consolidated financial position, results of operations, and future cash flows may be materially impacted.

We have received, and may in the future receive, notices from third parties claiming that their patents may be infringed by the use, development, manufacture, importation or sale of our products or product candidates. Under the guidance of ASC 450, Contingencies, we record a royalty accrual based on our best estimate of the fair value percent of net sales of our products that we could be required to pay the owners of patents for technology used in the manufacture and sale of our products. A costly license, or inability to obtain a necessary license, could have a material adverse effect on our financial results.

In May 2015, we received a subpoena in connection with an investigation by the Enforcement Division of the Securities and Exchange Commission (SEC) requesting information related to our grant-making activities and compliance with the Foreign Corrupt Practices Act (FCPA) in various countries. In addition, in October 2015, we received a request from the Department of Justice (DOJ) for the voluntary production of documents and other information pertaining to Alexion’s compliance with the FCPA. The SEC and DOJ also sought information related to Alexion’s recalls of specific lots of SOLIRIS and related securities disclosures.

The investigations focused on operations in various countries, including Brazil, Colombia, Japan, Russia and Turkey, and Alexion's compliance with the FCPA and other applicable laws.

In May 2020, DOJ informed us that it has closed its inquiry into these matters.

On July 2, 2020, we reached a civil settlement with the SEC fully resolving the SEC’s investigation into possible violations of the FCPA. Alexion neither admitted nor denied any wrongdoing in connection with the settlement but agreed to pay $21.5 to the SEC, consisting of amounts attributable to disgorgement, civil penalties, and pre-judgment interest. In connection with this settlement, in July 2020, we paid $21.5 to the SEC.

Following the settlement with the SEC, the Ministry of Health in Turkey initiated an investigation regarding the matters referenced in the SEC Order as they relate to the Company’s operations in Turkey between 2010 and 2015. We are cooperating with this investigation.

Alexion is committed to continually focusing on its compliance program and continues to enhance its comprehensive company-wide program that is designed to enhance our business processes, structures, controls, training, talent, and systems across Alexion’s global operations.

As previously reported, on December 29, 2016, a shareholder filed a putative class action against the Company and certain former employees in the U.S. District Court for the District of Connecticut, alleging that defendants made misrepresentations and omissions about SOLIRIS. On April 12, 2017, the court appointed a lead plaintiff. On July 14, 2017, the lead plaintiff filed an amended putative class action complaint against the Company and seven current or former employees. Defendants moved to dismiss the amended complaint on September 12, 2017. Plaintiffs filed an opposition to defendants’ motion to dismiss on November 13, 2017, and defendants filed a reply brief in further support of their motion on December 28, 2017. On March 26, 2019, the court held a telephonic status conference. During that conference, the court informed counsel that it was preparing a ruling granting the defendants’ pending motion to dismiss. The court inquired of plaintiffs’ counsel whether they intended to seek leave to amend their complaint, and indicated that if they wished to file a second amended complaint, they would be allowed to do so. On April 2, 2019, the court granted plaintiffs until May 31, 2019 to file a second amended

complaint, thereby rendering moot defendants’ pending motion to dismiss. On June 2, 2019, plaintiffs filed a second amended complaint against the same defendants. The complaint alleges that defendants engaged in securities fraud, including by making misrepresentations and omissions in its public disclosures concerning the Company’s SOLIRIS sales practices, management changes, and related investigations, between January 30, 2014 and May 26, 2017, and that the Company's stock price dropped upon the purported disclosure of the alleged fraud. The plaintiffs seek to recover unspecified monetary relief, unspecified equitable and injunctive relief, interest, and attorneys’ fees and costs. Defendants’ filed a motion to dismiss the amended complaint on August 2, 2019; plaintiffs’ filed their opposition to that motion on October 2, 2019; and defendants’ filed their reply in further support of their motion on November 15, 2019. Given the early stage of these proceedings, we cannot presently predict the likelihood of obtaining dismissal of the case (or the ultimate outcome of the case if the motion to dismiss is denied by the court), nor can we estimate the possible loss or range of loss at this time.

In December 2016, we received a subpoena from the U.S. Attorney's Office for the District of Massachusetts requesting documents relating generally to our support of Patient Services, Inc. (PSI) and National Organization for Rare Disorders (NORD), 501(c)(3) organizations that provide financial assistance to Medicare patients taking drugs sold by Alexion; Alexion’s provision of free drug to Medicare patients; and Alexion compliance policies and training materials concerning the anti-kickback statute and information on donations to PSI and NORD from 2010 through 2016. In April 2019, we entered into a civil settlement agreement with the DOJ and the Office of Inspector General (OIG) of the U.S. Department of Health and Human Services to resolve this matter. As part of the settlement agreement, Alexion paid $13.1 to the DOJ and OIG. OIG did not require a Corporate Integrity Agreement with Alexion because it made fundamental organizational changes, including hiring a new executive leadership team, replacing half of the members of its Board of Directors, and effecting a significant change in the workforce.

In May 2017, Brazilian authorities seized records and data from our São Paulo, Brazil offices as part of an investigation being conducted into Alexion’s Brazilian operations. We are cooperating with this inquiry.

In June 2017, we received a demand to inspect certain of our books and records pursuant to Section 220 of the General Corporation Law of the State of Delaware on behalf of a purported stockholder. Among other things, the demand sought to determine whether to institute a derivative lawsuit against certain of the Company’s directors and officers in relation to the investigation by our Audit and Finance Committee announced in November 2016 and the investigations instituted by the SEC, DOJ, U.S. Attorney’s Office for the District of Massachusetts, and Brazilian law enforcement officials that are described above. We have responded to the demand. Given the early stages of this matter, an estimate of the possible loss or range of loss cannot be made at this time.

On September 27, 2017, a hearing panel of the Canadian Patented Medicine Prices Review Board (PMPRB) issued a decision in a previously pending administrative pricing matter that we had excessively priced SOLIRIS in a manner inconsistent with the Canadian pricing rules and guidelines. In its decision, the PMPRB ordered Alexion to decrease the price of SOLIRIS to an upper limit based upon pricing in certain other countries, and to forfeit excess revenues for the period between 2009 and 2017. The amount of excess revenues for the period between 2009 and 2017 was determined not to be a material amount and was paid in 2018. In October 2017, Alexion filed an application for judicial review of the PMPRB’s decision in the Federal Court of Canada. On May 23, 2019, the Federal Court of Canada dismissed Alexion's application for judicial review and, as a consequence, affirmed the decision of the PMPRB that we had excessively priced SOLIRIS. On June 21, 2019, Alexion filed a notice of appeal of the Federal Court of Canada's ruling, and, on October 17, 2019, Alexion filed a memorandum of fact and law in support of the appeal. On December 3, 2019, the Attorney General of Canada filed its memorandum of fact and law in support of the Federal Court of Canada's dismissal of Alexion's appeal of the PMPRB's decision. On December 19, 2019, the intervenor, the Minister of Health for the Province of British Columbia, filed a separate memorandum of fact and law in support of the Federal Court of Canada's decision. The Canadian Federal Court of Appeal heard the appeal on October 21 and 22, 2020, but has not issued a decision as of the date of this filing. Pursuant to an order made by the Federal Court of Canada, as of April 28, 2021, we have placed approximately $80.9 in escrow to secure our obligations pending the final resolution of all appeals in this matter. This amount reflects the difference between the list price for SOLIRIS and the price determined by the PMPRB to be non-excessive for sales of SOLIRIS in Canada for the period beginning September 2017 through March 31, 2021. In addition, on a quarterly basis, until the appeals process has concluded, Alexion will be required to place amounts into escrow for each vial of SOLIRIS sold in the applicable quarter equal to the difference between the list price for SOLIRIS and the price determined by the PMPRB to be non-excessive. Our revenues in Canada have been reduced by $54.7 cumulatively to date, which is our current best estimate of our liability through March 31, 2021 if we lose the appeal of this matter (the amount of our ultimate liability, however, may be greater than this estimate when the appeal process for this matter is concluded).

Chugai Pharmaceutical Co., Ltd. has filed three lawsuits against Alexion. The first was filed in November 2018 in the United States District Court for the District of Delaware against Alexion Pharmaceuticals, Inc. alleging that ULTOMIRIS infringes one U.S. patent held by Chugai Pharmaceutical Co., Ltd. Upon issuance of a new U.S. patent on November 12, 2019, Chugai filed a second lawsuit in the United States alleging that ULTOMIRIS infringes the new patent. The parties have agreed to consolidate the November 2018 and November 2019 lawsuits. Chugai filed a third lawsuit in December 2018 in the Tokyo District Court against Alexion Pharma GK (a wholly-owned subsidiary of Alexion) in Japan, and alleges that ULTOMIRIS infringes two Japanese patents held by Chugai Pharmaceutical Co., Ltd.  Chugai’s complaints seek unspecified damages and certain injunctive relief. On March 5, 2020, the Supreme Court of Japan dismissed Chugai's appeal against an earlier IP High Court of Japan decision which held that one of the Chugai patents-in-suit is invalid. Subsequently Chugai filed a correction to the claims of this patents-in-suit and Alexion has countered that the corrected claims are still invalid and not infringed. In all cases, Alexion has denied the charges and countered that the patents are neither valid nor infringed. A trial date for the U.S. case which was initially set for July 2021 has been re-scheduled for January 2022. The case is still at the briefing stage in Japan. Given the early stages of these litigations, an estimate of the possible loss or range of loss cannot be made at this time.

In connection with an ongoing matter, in August 2019, the Brazilian Federal Revenue Service provided a Notice of Tax and Description of the Facts (the “Tax Assessment”) to two Alexion subsidiaries (the "Brazil Subsidiaries"), as well as to two additional entities, a logistics provider utilized by Alexion and a distributor. The Tax Assessment focuses on the importation of SOLIRIS vials pursuant to Alexion’s free drug supply to patients program (referred to as Global Access to Medicines, or GATM) in Brazil. In September 2019, the Brazil Subsidiaries filed defenses to the Tax Assessment disputing the basis for liability under the Tax Assessment, based on, among others, the following: in connection with the operation of GATM, during the period from September 2014 to June 2019: (i) the importers responsible for the importation of the GATM SOLIRIS vials into Brazil were correctly identified and (ii) the correct customs value was utilized for the purpose of importing the GATM SOLIRIS vials provided to the patients free of charge. Alexion prevailed in the first level of administrative appeals in the Brazilian federal administrative proceeding system based on a deficiency in the Brazil Tax Assessment. The decision was subject to an automatic (ex officio) appeal to the second level of the administrative courts. On March 30, 2021, counter-arguments against the ex officio appeal were filed on behalf of the Brazil Subsidiaries. There are three separate levels of administrative appeals within the Brazilian federal administrative proceeding system and, if the outcome of these administrative appeals is unfavorable, the final decision of the federal administrative proceeding system can be disputed to the federal court systems in Brazil (at this time, Alexion intends to appeal the Tax Assessment if it is not overturned in the course of administrative appeals). Given the early stage of these proceedings, Alexion is unable to predict the duration, scope or outcome of this matter, but we expect that a final resolution will take three years or more. While it is possible that a loss related to the Tax Assessment may be incurred, given its ongoing nature, we cannot reasonably estimate the potential magnitude of any such possible loss or range of loss, or the cost of the ongoing administrative appeals (and potential appeals to the federal court system) of the Tax Assessment. Any determination that any aspects of the importation of free of charge medications into Brazil as set forth in the Tax Assessment are not, or were not, in compliance with existing laws or regulations could result in the imposition of fines, civil penalties and, potentially criminal penalties, and/or other sanctions against us, and could have an adverse impact on our Brazilian operations.

In connection with Alexion’s acquisition of Portola, we have assumed litigation to which Portola was a party. Among the litigation assumed is a securities fraud class action filed against Portola and certain of its officers, directors and underwriters (“Defendants”) under the Securities Act of 1933 and the Securities Exchange Act of 1934. Specifically, on January 16, 2020, February 7, 2020, and February 28, 2020, stockholders filed three putative class actions in the U.S. District Court for the Northern District of California, captioned Hayden v. Portola Pharmaceuticals, Inc., et al., No. 3:20-cv-00367-VC (N.D. Cal.); McCutcheon v. Portola Pharmaceuticals, Inc., et al., No. 3:20-cv-00949 (N.D. Cal.); and Southeastern Pennsylvania Transportation Authority v. Portola Pharmaceuticals, Inc., et al., No. 3:20-cv-01501 (N.D. Cal.). These cases have since been consolidated, and on April 22, 2020, the Court issued an Order appointing the Alameda County Employees’ Retirement Association (“ACERA”) as Lead Plaintiff in the litigation. ACERA filed its amended consolidated complaint on May 20, 2020, asserting that Defendants made misrepresentations and omissions in public disclosures (including in materials issued in connection with the August 7, 2019 securities offering) concerning Portola’s sales of andexanet alfa, marketed as ANDEXXA in the United States and ONDEXXYA in Europe, between January 8, 2019 and February 26, 2020. Specifically, plaintiffs allege that Defendants made materially false and/or misleading statements about the demand for ANDEXXA, usage of ANDEXXA by hospitals and healthcare organizations, and about Portola’s accounting for its return reserves. Plaintiffs contend that the alleged fraud was revealed on January 9, 2020, when Portola announced its preliminary unaudited financial

results for the fourth quarter of 2019, and again on February 26, 2020, when Portola issued its fourth quarter 2019 financial results. In July 2020, Portola and the Portola Defendants filed a motion to dismiss with the Court. The court heard oral argument on September 24, 2020 and granted defendants’ pending motion to dismiss, but with leave for plaintiffs to amend further their complaint. Plaintiffs filed an amended complaint on November 5, 2020. In December 2020, Portola and Portola Defendants filed a motion to dismiss with the Court. A hearing occurred on March 4, 2021, and the Court dismissed the case with leave to amend on March 10, 2021. The Plaintiffs filed a second amended complaint on March 31, 2021. Portola and the Portola Defendants must file a motion to dismiss by May 5, 2021, with the opposition scheduled to be filed by June 9,2021, and the reply scheduled to be filed by June 30, 2021. A hearing is scheduled for July 22, 2021. Plaintiffs seek to recover unspecified monetary relief, interest, and attorneys’ fees and costs. Given the early stage of these proceedings, we cannot presently predict the likelihood of obtaining dismissal of the case (or the ultimate outcome of the case if that motion to dismiss is denied by the court), nor can we estimate the possible loss or range of loss at this time.

In connection with the transactions contemplated by the Merger Agreement with AstraZeneca, nine complaints have been filed by purported Alexion stockholders against Alexion and its current or former directors, and, in certain cases, AstraZeneca and the Merger Subs. The complaints are captioned Votto v. Alexion Pharmaceuticals, Inc., et al., No. 1:21-cv-02067 (S.D.N.Y); Wang v. Alexion Pharmaceuticals, Inc., et al., No. 1:21-cv-02095 (S.D.N.Y.); Wei v. Alexion Pharmaceuticals, Inc., et al., No. 1:21-cv-02100 (S.D.N.Y.); Naquin v. Alexion Pharmaceuticals, Inc., et al., No. 1:21-cv-02119 (S.D.N.Y.); Raul v. Alexion Pharmaceuticals, Inc., et al., No. 1:21-cv-02238 (S.D.N.Y.); Parshall v. Alexion Pharmaceuticals, Inc., et al., No. 1:21-cv-02670 (S.D.N.Y.); Davis v. Alexion Pharmaceuticals, Inc., et al., No. 1:21-cv-01429 (E.D.N.Y.); Kent v. Alexion Pharmaceuticals, Inc., et al., No. 1:21-cv-00441 (D. Del.); McKenzie v. Alexion Pharmaceuticals, Inc., et al., No. 2:21-cv-01515 (E.D. Pa.). The complaints generally allege that the preliminary registration statement filed with the SEC on February 19, 2021, omitted certain allegedly material information in connection with the transaction, and one of the complaints further alleges that the Alexion directors breached their fiduciary duties in connection with the transaction and that AstraZeneca and the other entity defendants aided and abetted the alleged breaches. The lawsuits seek various remedies, including enjoining the consummation of the transaction unless certain allegedly material information is disclosed, directing dissemination of additional allegedly material disclosures, rescission of the transaction, or rescissory damages in the event the transaction is consummated without such disclosures, and an accounting to the plaintiffs for any damages allegedly suffered. Given the early stage of the proceedings, an estimate of the possible loss or range of loss cannot be made at this time.

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Basis of Presentation and Principles Of Consolidation (Policies)

3 Months Ended

Mar. 31, 2021

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation and Principles of Consolidation

The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by accounting principles generally accepted in the United States for complete financial statements. These accounting principles were applied on a basis consistent with those of the consolidated financial statements contained in the Company's Annual Report on Form 10-K for the year ended December 31, 2020. In our opinion, the accompanying unaudited condensed consolidated financial statements include all adjustments, consisting of only normal recurring adjustments, necessary for a fair statement of our financial statements for interim periods presented in accordance with accounting principles generally accepted in the United States. The condensed consolidated balance sheet as of December 31, 2020 was derived from audited annual financial statements but does not include all disclosures required by accounting principles generally accepted in the United States. These interim financial statements should be read in conjunction with the audited financial statements for the year ended December 31, 2020 included in our Annual Report on Form 10-K for the year ended December 31, 2020. The results of operations for the three months ended March 31, 2021 are not necessarily indicative of the results to be expected for the full year or any other future periods.

Our significant accounting policies are described in Note 1 of the notes to the consolidated financial statements included in our Annual Report on Form 10-K for the year ended December 31, 2020 and updated, as necessary in this report.

The financial statements of our subsidiaries with functional currencies other than the U.S. dollar are translated into U.S. dollars using period-end exchange rates for assets and liabilities, historical exchange rates for stockholders' equity and weighted average exchange rates for operating results. Translation gains and losses are included in accumulated other comprehensive income (loss), net of tax, in stockholders' equity. Foreign currency transaction gains and losses are included in the results of operations in other income and expense.

The accompanying unaudited condensed consolidated financial statements include the accounts of Alexion Pharmaceuticals, Inc. and its subsidiaries, including Caelum Biosciences (Caelum), a variable interest entity (VIE) for which we are the primary beneficiary, refer to Note 10, Caelum Biosciences. All intercompany balances and transactions have been eliminated in consolidation.

We assess whether we are the primary beneficiary of a VIE at the inception of the arrangement and at each reporting date. This assessment is based on our power to direct the activities of the VIE that most significantly impact the VIE’s economic performance and our obligation to absorb losses or the right to receive benefits from the VIE that could potentially be significant to the VIE. For the consolidation of Caelum, we record net income (loss) attributable to noncontrolling interest in our consolidated statements of operations based on the ownership interest retained by the respective noncontrolling parties.

New Accounting Pronouncements

New Accounting Pronouncements

ASU 2020-04, “Reference Rate Reform, Facilitation of the Effects of Reference Rate Reform on Financial Reporting": In response to concerns about structural risks of interbank offered rates, and, particularly, the risk of cessation of the London Interbank Offered Rate (LIBOR), regulators around the world have undertaken reference rate reform initiatives to identify alternative reference rates that are more observable or transaction-based and less susceptible to manipulation. In March 2020, the Financial Accounting Standards Board (FASB) issued a new standard that provides optional guidance for a limited time to ease the potential burden in accounting for the effects of reference rate reform, including optional expedients and exceptions for the accounting implications of contracts, hedging relationships, and other transactions affected by reference rate reform if certain criteria are met.

The amendments in this new standard only apply to contracts and hedging relationships that reference LIBOR or another reference rate expected to be discontinued due to reference rate reform. The expedients and exceptions provided by the standard do not apply to contract modifications made and hedging relationships entered into or evaluated after December 31, 2022. We are currently reviewing our contracts impacted by reference rate reform and are assessing the impact of this standard on our financial condition and results of operations.

Recently Adopted Accounting Pronouncements

Accounting Standards Update (ASU) 2019-12, “Income Taxes: Simplifying the Accounting for Income Taxes”: In December 2019, the FASB issued a new standard intended to simplify the accounting for income taxes by eliminating certain exceptions related to the approach for intraperiod tax allocation, the methodology for calculating income taxes in an interim period and the recognition of deferred tax liabilities for outside basis differences. The new standard also simplifies aspects of the accounting for franchise taxes and enacted changes in tax laws or rates and clarifies the accounting for transactions that result in a step-up in the tax basis of goodwill. The standard is effective for annual periods beginning after December 15, 2020 and interim periods within, with early adoption permitted. Adoption of the standard requires certain changes to be made prospectively, with some changes to be made retrospectively. We adopted the new standard on January 1, 2021. The adoption of this standard did not have an impact on our financial condition and results of operations.

ASU 2020-01, “Investments - Equity Securities, Investments - Equity Method and Joint Ventures, and Derivatives and Hedging - Clarifying the Interactions Between Topic 321, Topic 323, and Topic 815”: In January 2020, the FASB issued a new standard intended to clarify the interactions between Accounting Standards Codification (ASC) 321, ASC 323 and ASC 815. The new standard addresses accounting for the transition into and out of the equity method and measurement of certain purchased options and forward contracts to acquire investments. The standard is effective for annual and interim periods beginning after December 15, 2020, with early adoption permitted. Adoption of the standard requires changes to be made prospectively. We adopted the new standard on January 1, 2021. The adoption of this standard did not have an impact on our financial condition and results of operations.

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Acquisitions (Tables)

3 Months Ended

Mar. 31, 2021

Business Combinations [Abstract]

Schedule of Business Acquisitions, by Acquisition

The following table summarizes the total consideration transferred to acquire Achillion and the estimated fair value of the identified assets acquired and liabilities assumed at the acquisition date:

Consideration
Upfront payment to shareholders and option holders	$	926.2
Upfront payment, fair value of equity compensation attributable to the post-combination service period	(20.0)
Upfront cash paid, net	906.2
Contingent consideration	160.7
Contingent consideration, fair value of equity compensation attributable to the post-combination service period	(5.7)
Total consideration	$	1,061.2
Assets Acquired and Liabilities Assumed
Cash and cash equivalents	$	68.5
Marketable securities	106.1
In-process research & development assets (IPR&D)	918.0
Goodwill	37.8
Deferred tax liabilities, net	(62.9)
Other assets and liabilities, net	(6.3)
Total net assets acquired	$	1,061.2

The following table summarizes the total consideration transferred to acquire Portola and the estimated fair value of the identified assets acquired and liabilities assumed at the acquisition date:

Consideration
Upfront payment to shareholders and equity holders	$	1,380.8
Upfront payment, fair value of equity compensation attributable to the post-combination service period	(11.1)
Upfront cash paid, net	1,369.7
Fair value of equity shares held by Alexion at closing	47.8
Fair value of replacement equity awards attributable to the pre-combination period	7.2
Total consideration to acquire outstanding equity, net	1,424.7
Total consideration to settle preexisting debt	196.9
Total consideration	$	1,621.6
Assets Acquired and Liabilities Assumed
Cash and cash equivalents	$	288.5
Marketable securities	17.8
Inventories, including noncurrent portion of $169.1 and validation batches of $60.9	362.5
Intangible assets	1,051.0
Goodwill	24.9
Deferred tax assets, net	116.6
Other assets	41.9
Accounts payable and accrued expenses	(75.6)
Long-term debt, including current portion of $7.7	(182.0)
Other liabilities	(24.0)
Total net assets acquired	$	1,621.6

Summary of Pro Forma Information

The following unaudited pro forma information presents the combined results of Alexion and Achillion as if the acquisition of Achillion had been completed on January 1, 2019, with adjustments to give effect to pro forma events that are directly attributable to the acquisition. The unaudited pro forma results do not reflect operating efficiencies or potential cost savings that may have resulted from the consolidation of operations. Accordingly, the unaudited pro forma financial information is not necessarily indicative of the results of operations had we completed the transaction on January 1, 2019.

	Three months ended March 31,
	2020		2019
Pro forma revenue	$	1,444.8	$	1,140.4
Pro forma net income	$	574.9	$	515.7

Summary of Acquisition-Related Costs

Acquisition-related costs recorded within the condensed consolidated statements of operations associated with our acquisitions of Achillion and Portola and our definitive merger agreement with AstraZeneca for the three months ended March 31, 2021 and 2020 include the following:

	Three months ended March 31
	2021		2020
Transaction costs (1)	$	5.4	$	1.4
Integration costs	4.1		0.1
Fair value of equity compensation attributable to the post-combination service period	—		25.7
Employee costs (2)	3.7		10.9
	$	13.2	$	38.1

(1) Transaction costs primarily include legal fees. First quarter 2020 transaction costs also include costs to effectuate the settlement of the Achillion outstanding options

(2) Employee separation costs include severance payments and costs associated with one-time short-term retention awards

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Inventories (Tables)

3 Months Ended

Mar. 31, 2021

Inventory, Net [Abstract]

Schedule of Inventory, Current

The components of inventory are as follows:

	March 31,		December 31,
	2021		2020
Raw materials	$	97.8	$	91.2
Work-in-process	324.7		260.8
Finished goods	489.6		510.3
Total inventories	$	912.1	$	862.3
Balance Sheet Classification:
Inventories	$	803.9	$	775.7
Other assets	$	108.2	$	86.6

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Intangible Assets and Goodwill (Tables)

3 Months Ended

Mar. 31, 2021

Goodwill and Intangible Assets Disclosure [Abstract]

Schedule of Intangible Assets and Goodwill

The following table summarizes the carrying amount of our intangible assets and goodwill, net of accumulated amortization and impairment charges: 

		March 31, 2021							December 31, 2020
	Estimated Life (years)	Cost		Accumulated Amortization			Net		Cost		Accumulated Amortization			Net
Licensing rights	3-8	$	57.0	$	(39.4)		$	17.6	$	57.0	$	(38.5)		$	18.5
Patents	7	10.5		(10.5)			—		10.5		(10.5)			—
Purchased technology	6-16	5,746.5		(3,737.9)		(a)	2,008.6		5,746.5		(3,684.7)		(a)	2,061.8
Other intangibles	5	0.4		(0.3)			0.1		0.4		(0.3)			0.1
Priority review voucher	Indefinite	100.0		—			100.0		—		—			—
Acquired IPR&D	Indefinite	922.0		—			922.0		922.0		—			922.0
Total		$	6,836.4	$	(3,788.1)		$	3,048.3	$	6,736.4	$	(3,734.0)		$	3,002.4
Goodwill	Indefinite	$	5,103.0	$	(2.9)		$	5,100.1	$	5,103.0	$	(2.9)		$	5,100.1
(a) Includes an impairment charge of $2,042.3 recognized during the second quarter 2020 related to the KANUMA intangible asset

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Debt (Tables)

3 Months Ended

Mar. 31, 2021

Debt Disclosure [Abstract]

Schedule of Debt

Our payment obligations for HCR royalty-based debt are as follows:

	Three Months Ended March 31, 2021
Total repayment obligation as of December 31, 2020	$	271.9
Less: Interest to be accreted in future periods	(79.9)
Less: Payments made	(3.3)
Carrying value as of March 31, 2021	$	188.7

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Earnings Per Common Share (Tables)

3 Months Ended

Mar. 31, 2021

Earnings Per Common Share [Abstract]

Schedule Of Basic And Diluted Earnings Per Share

The following table summarizes the calculation of basic and diluted EPS for the three months ended March 31, 2021 and 2020:

	Three months ended
	March 31,
	2021		2020
Net income attributable to Alexion	$	636.0	$	557.6
Shares used in computing earnings per common share attributable to Alexion —basic	220.1		221.6
Weighted-average effect of dilutive securities:
Stock awards	2.5		1.0
Shares used in computing earnings per common share attributable to Alexion —diluted	222.6		222.6
Earnings per common share attributable to Alexion:
Basic	$	2.89	$	2.52
Diluted	$	2.86	$	2.50

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Marketable Securities (Tables)

3 Months Ended

Mar. 31, 2021

Investments, Debt and Equity Securities [Abstract]

Realized Gain (Loss) on Investments

The proceeds from maturities and sales of available-for-sale debt securities and resulting realized gains and losses are summarized below. In the second quarter of 2020 we liquidated all of our available-for-sale securities and in the third quarter of 2020 we liquidated all available-for-sale debt securities acquired in connection with the Portola acquisition.

	Three months ended
	March 31,
	2021		2020
Proceeds from maturities and sales (1)	$	—	$	812.5
Realized gains	$	—	$	—
Realized losses	$	—	$	—
(1) Proceeds from maturities and sales of available-for-sale debt securities include securities previously classified as cash and cash equivalents and marketable securities in the condensed consolidated balance sheets.

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Derivative Instruments and Hedging Activities (Tables)

3 Months Ended

Mar. 31, 2021

Derivative Instruments and Hedging Activities [Abstract]

Schedule of Interest Rate Contracts

The following table summarizes the total interest rate swap contracts executed as of March 31, 2021:

Type of Interest Rate Swap Contract	Notional Amount	Effective Date	Termination Date	Fixed Interest Rate or Rate Range
Floating to Fixed	$450.0	December 2018	December 2022	2.60% - 2.79%
Floating to Fixed	$1,300.0	December 2019	December 2022	2.37% - 2.83%

Schedule of Other Comprehensive Income and Earnings from Foreign Exchange Contracts

The amount of gains and (losses) recognized in the condensed consolidated statements of operations for the three months ended March 31, 2021 and 2020 from foreign exchange and interest rate swap contracts that qualified as cash flow hedges were as follows:

	Three months ended				Three months ended
	March 31, 2021				March 31, 2020
Financial Statement Line Item in which the Effects of Cash Flow Hedges are Recorded	Net Product Sales		Interest Expense		Net Product Sales		Interest Expense
Total amount presented in the Condensed Consolidated Statements of Operations	$	1,635.7	$	(27.1)	$	1,444.6	$	(25.8)
Impact of cash flow hedging relationships:
Foreign exchange forward contracts	$	(11.8)	$	—	$	11.4	$	—
Interest rate contracts	$	—	$	(11.4)	$	—	$	(4.6)

The impact on accumulated other comprehensive income (AOCI) and earnings from foreign exchange and interest rate swap contracts that qualified as cash flow hedges, for the three months ended March 31, 2021 and 2020 were as follows:

	Three months ended
	March 31,
	2021		2020
Foreign Exchange Forward Contracts:
Gain recognized in AOCI, net of tax	$	33.4	$	26.0
(Loss) gain reclassified from AOCI to net product sales, net of tax	$	(9.1)	$	8.8
Interest Rate Swap Contracts:
Gain (loss) recognized in AOCI, net of tax	$	1.0	$	(47.3)
Loss reclassified from AOCI to interest expense, net of tax	$	(8.8)	$	(3.6)

Schedule of Fair Value of Outstanding Derivatives

The following tables summarize the fair value of outstanding derivatives as of March 31, 2021 and December 31, 2020: 

	March 31, 2021
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments:
Foreign exchange forward contracts	Prepaid expenses and other current assets	$	19.2	Other current liabilities	$	9.4
Foreign exchange forward contracts	Other assets	0.1		Other liabilities	—
Interest rate contracts	Prepaid expenses and other current assets	—		Other current liabilities	45.7
Interest rate contracts	Other assets	—		Other liabilities	32.9
Derivatives not designated as hedging instruments:
Foreign exchange forward contracts	Prepaid expenses and other current assets	22.3		Other current liabilities	12.2
Total fair value of derivative instruments		$	41.6		$	100.2

	December 31, 2020
	Asset Derivatives			Liability Derivatives
	Balance Sheet Location	Fair Value		Balance Sheet Location	Fair Value
Derivatives designated as hedging instruments:
Foreign exchange forward contracts	Prepaid expenses and other current assets	$	—	Other current liabilities	$	44.3
Foreign exchange forward contracts	Other assets	—		Other liabilities	1.2
Interest rate contracts	Prepaid expenses and other current assets	—		Other current liabilities	45.9
Interest rate contracts	Other assets	—		Other liabilities	45.4
Derivatives not designated as hedging instruments:
Foreign exchange forward contracts	Prepaid expenses and other current assets	26.1		Other current liabilities	35.8
Total fair value of derivative instruments		$	26.1		$	172.6

Offsetting Assets and Liabilities

The following tables summarize the potential effect on our condensed consolidated balance sheets of offsetting our foreign exchange forward contracts and interest rate contracts subject to such provisions:

	March 31, 2021
							Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet
Description	Gross Amounts of Recognized Assets/Liabilities		Gross Amounts Offset in the Condensed Consolidated Balance Sheet		Net Amounts of Assets/Liabilities Presented in the Condensed Consolidated Balance Sheet		Derivative Financial Instruments		Cash Collateral Received (Pledged)		Net Amount
Derivative assets	$	41.6	$	—	$	41.6	$	(21.3)	$	—	$	20.3
Derivative liabilities	$	(100.2)	$	—	$	(100.2)	$	21.3	$	—	$	(78.9)

	December 31, 2020
							Gross Amounts Not Offset in the Condensed Consolidated Balance Sheet
Description	Gross Amounts of Recognized Assets/Liabilities		Gross Amounts Offset in the Condensed Consolidated Balance Sheet		Net Amounts of Assets/Liabilities Presented in the Condensed Consolidated Balance Sheet		Derivative Financial Instruments		Cash Collateral Received (Pledged)		Net Amount
Derivative assets	$	26.1	$	—	$	26.1	$	(26.1)	$	—	$	—
Derivative liabilities	$	(172.6)	$	—	$	(172.6)	$	26.1	$	—	$	(146.5)

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Caelum Biosciences (Tables)

3 Months Ended

Mar. 31, 2021

Noncontrolling Interest [Abstract]

Schedule of Recognized Identified Assets Acquired and Liabilities Assumed

The following table summarizes the assets acquired and liabilities assumed in connection with the consolidation of Caelum:

Assets Acquired and Liabilities Assumed
Cash and cash equivalents	$	16.9
Acquired in-process research and development	193.3
Other assets and liabilities, net	6.8
Total net assets acquired	$	217.0

Schedule of Variable Interest Entities

The carrying value of the assets and liabilities associated with Caelum included in the condensed consolidated balance sheets as of March 31, 2021, which are limited in use for its operations and do not have recourse against our general credit are as follows:

	March 31, 2021
Cash and cash equivalents	$	56.5
Prepaid expenses and other current assets	$	8.6
Other assets	$	7.8
Accounts payable	$	3.6
Accrued expenses	$	2.3

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Other Comprehensive Income and Accumulated Other Comprehensive Income (Tables)

3 Months Ended

Mar. 31, 2021

Accumulated Other Comprehensive Income [Abstract]

Schedule of Accumulated Other Comprehensive Income (Loss)

The following tables summarize the changes in AOCI, by component, for the three months ended March 31, 2021 and 2020:

	Defined Benefit Pension Plans		Unrealized Gains (Losses) from Debt Securities		Unrealized Gains (Losses) from Hedging Activities		Foreign Currency Translation Adjustment		Total Accumulated Other Comprehensive Income (Loss)
Balances, December 31, 2020	$	(10.2)	$	—	$	(102.7)	$	(11.7)	$	(124.6)
Other comprehensive income (loss) before reclassifications	—		—		34.6		(13.1)		21.5
Amounts reclassified from other comprehensive income	—		—		17.9		—		17.9
Net other comprehensive income (loss)	—		—		52.5		(13.1)		39.4
Balances, March 31, 2021	$	(10.2)	$	—	$	(50.2)	$	(24.8)	$	(85.2)

	Defined Benefit Pension Plans		Unrealized Gains (Losses) from Debt Securities		Unrealized Gains (Losses) from Hedging Activities		Foreign Currency Translation Adjustment		Total Accumulated Other Comprehensive Income (Loss)
Balances, December 31, 2019	$	(9.2)	$	(0.1)	$	(40.1)	$	(17.4)	$	(66.8)
Other comprehensive income (loss) before reclassifications	—		(0.2)		(21.3)		(8.0)		(29.5)
Amounts reclassified from other comprehensive income	—		—		(5.2)		—		(5.2)
Net other comprehensive income (loss)	—		(0.2)		(26.5)		(8.0)		(34.7)
Balances, March 31, 2020	$	(9.2)	$	(0.3)	$	(66.6)	$	(25.4)	$	(101.5)

Reclassification out of Accumulated Other Comprehensive Income

The table below provides details regarding significant reclassifications from AOCI during the three months ended March 31, 2021 and 2020:

Details about Accumulated Other Comprehensive Income Components	Amount Reclassified From Accumulated Other Comprehensive Income during the three months ended March 31,				Affected Line Item in the Condensed Consolidated Statements of Operations
	2021		2020
Unrealized Gains (Losses) on Hedging Activity
Foreign exchange forward contracts	$	(11.8)	$	11.4	Net product sales
Interest rate contracts	(11.4)		(4.6)		Interest expense
	(23.2)		6.8
	5.3		(1.6)		Income tax expense
	$	(17.9)	$	5.2

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Fair Value Measurement (Tables)

3 Months Ended

Mar. 31, 2021

Fair Value Disclosures [Abstract]

Schedule Of Assets And Liabilites Measured At Fair Value

The following tables present information about our assets and liabilities that are measured at fair value on a recurring basis as of March 31, 2021 and December 31, 2020, and indicate the fair value hierarchy of the valuation techniques we utilized to determine such fair value.

		Fair Value Measurement as of March 31, 2021
Balance Sheet Classification	Type of Instrument	Total		Level 1		Level 2		Level 3
Cash equivalents	Money market funds	$	1,258.8	$	—	$	1,258.8	$	—
Marketable securities	Mutual funds	$	39.7	$	39.7	$	—	$	—
Other assets	Equity securities	$	137.4	$	137.4	$	—	$	—
Prepaid expenses and other current assets	Foreign exchange forward contracts	$	41.5	$	—	$	41.5	$	—
Other assets	Foreign exchange forward contracts	$	0.1	$	—	$	0.1	$	—
Other current liabilities	Foreign exchange forward contracts	$	21.6	$	—	$	21.6	$	—
Other current liabilities	Interest rate contracts	$	45.7	$	—	$	45.7	$	—
Other liabilities	Interest rate contracts	$	32.9	$	—	$	32.9	$	—
Current portion of contingent consideration	Acquisition-related contingent consideration	$	120.0	$	—	$	—	$	120.0
Contingent consideration	Acquisition-related contingent consideration	$	303.5	$	—	$	—	$	303.5

		Fair Value Measurement as of December 31, 2020
Balance Sheet Classification	Type of Instrument	Total		Level 1		Level 2		Level 3
Cash equivalents	Money market funds	$	833.7	$	—	$	833.7	$	—
Marketable securities	Mutual funds	$	34.9	$	34.9	$	—	$	—
Other assets	Equity securities	$	143.2	$	122.7	$	20.5	$	—
Prepaid expenses and other current assets	Foreign exchange forward contracts	$	26.1	$	—	$	26.1	$	—
Other current liabilities	Foreign exchange forward contracts	$	80.1	$	—	$	80.1	$	—
Other liabilities	Foreign exchange forward contracts	$	1.2	$	—	$	1.2	$	—
Other current liabilities	Interest rate contracts	$	45.9	$	—	$	45.9	$	—
Other liabilities	Interest rate contracts	$	45.4	$	—	$	45.4	$	—
Current portion of contingent consideration	Acquisition-related contingent consideration	$	114.9	$	—	$	—	$	114.9
Contingent consideration	Acquisition-related contingent consideration	$	299.4	$	—	$	—	$	299.4

Schedule Of Acquisition-Related Contingent Consideration

The following table represents a roll-forward of our acquisition-related contingent consideration:

	Three Months Ended March 31, 2021
Balance as of December 31, 2020	$	414.3
Changes in fair value	9.2
Balance as of March 31, 2021	$	423.5

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Revenue Recognition (Tables)

3 Months Ended

Mar. 31, 2021

Revenue from Contract with Customer [Abstract]

Disaggregation of revenue from contracts with customer

The Company disaggregates revenue from contracts with customers into product and geographical regions as summarized below.

	Three months ended March 31,
	2021		2020
SOLIRIS
United States	$	553.9	$	556.2
Europe	251.3		263.5
Asia Pacific	102.4		87.1
Rest of World	120.0		116.1
Total	$	1,027.6	$	1,022.9
ULTOMIRIS
United States	$	206.9	$	131.5
Europe	63.8		33.8
Asia Pacific	73.3		57.1
Rest of World	2.9		0.4
Total	$	346.9	$	222.8
STRENSIQ
United States	$	155.2	$	128.1
Europe	18.9		24.0
Asia Pacific	17.0		13.6
Rest of World	6.4		6.5
Total	$	197.5	$	172.2
ANDEXXA
United States	$	25.3	$	—
Europe	3.6		—
Asia Pacific	—		—
Rest of World	—		—
Total	$	28.9	$	—
KANUMA
United States	$	17.1	$	16.4
Europe	10.8		7.5
Asia Pacific	1.2		0.9
Rest of World	5.7		1.9
Total	$	34.8	$	26.7
Total Net Product Sales	$	1,635.7	$	1,444.6

Summary of receivables and contract liabilities from contracts

	March 31, 2021		December 31, 2020
Receivables, which are included in "Trade accounts receivable, net"	$	1,473.0	$	1,409.3
Contract liabilities, which are included in "Other current liabilities"	$	23.8	$	3.0

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Income Taxes (Tables)

3 Months Ended

Mar. 31, 2021

Income Tax Disclosure [Abstract]

Schedule of Income Tax Provision and Effective Tax Rate

The following table provides a comparative summary of our income tax expense and effective income tax rate for the three months ended March 31, 2021:

	Three months ended
	March 31,
	2021			2020
Income tax expense	$	113.4		$	106.0
Effective income tax rate	18.8		%	16.0		%

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Business (Details) - USD ($) $ / shares in Units, $ in Millions	Dec. 12, 2020	Mar. 31, 2021	Dec. 31, 2020
Business Acquisition [Line Items]
Common stock, par value		$ 0.0001	$ 0.0001
AstraZeneca
Business Acquisition [Line Items]
Common stock, par value	$ 0.0001
Right to receive depositary shares (shares)	2.1243
Total acquisition value, per share (in dollars per share)	$ 60.00
Merger payment	$ 1,180.0
Payment if merger is terminated	270.0
AstraZeneca | AstraZeneca
Business Acquisition [Line Items]
Payment if merger is terminated	$ 1,415.0

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Acquisitions (Narrative) (Details) - USD ($)			1 Months Ended		3 Months Ended				12 Months Ended
	Jul. 02, 2020	Jan. 28, 2020	Apr. 30, 2020	Mar. 31, 2020	Mar. 31, 2021	Dec. 31, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2020	Feb. 28, 2017
Schedule Of Asset Acquisition, By Acquisition [Line Items]
Contingent consideration					$ 303,500,000	$ 299,400,000			$ 299,400,000
Change in fair value of contingent consideration					9,200,000			$ 5,800,000
Upfront payment, fair value of equity compensation attributable to the post-combination service period					$ 0			(25,700,000)
Fair Value Inputs, Weighted Average Cost of Capital					11.50%
Payments to Acquire Other Investments					$ 0			34,500,000
Acquisition costs not included in net income								53,300,000
Portola Pharmaceuticals
Schedule Of Asset Acquisition, By Acquisition [Line Items]
Payments to Acquire Other Investments			$ 3,600,000	$ 14,500,000
Equity Securities, FV-NI	$ 47,800,000
HealthCare Royalty Partners | Royalty-Based Financing Agreement
Schedule Of Asset Acquisition, By Acquisition [Line Items]
Repayments of debt					3,300,000
Outstanding debt					188,700,000	187,000,000.0			187,000,000.0
HealthCare Royalty Partners | Royalty-Based Financing Agreement | Portola Pharmaceuticals, Inc.
Schedule Of Asset Acquisition, By Acquisition [Line Items]
Repayments of debt	$ 13,700,000
Royalty Agreement, Maximum Potential Royalty Payments										$ 290,600,000
Purchased technology
Schedule Of Asset Acquisition, By Acquisition [Line Items]
Impairment							$ 2,042,300,000
Achillion
Schedule Of Asset Acquisition, By Acquisition [Line Items]
Total acquisition value, per share (in dollars per share)		$ 6.30
Upfront payment to shareholders and option holders		$ 926,200,000
Goodwill adjustments							3,100,000
Contingent consideration		160,700,000			212,800,000
Contingent consideration, fair value of equity compensation attributable to the post-combination service period		5,700,000
Change in fair value of contingent consideration					$ 2,200,000			1,700,000
Upfront payment, fair value of equity compensation attributable to the post-combination service period		(20,000,000.0)						(25,700,000)
Net deferred tax liability		(62,900,000)
Deferred tax assets, net		$ 142,400,000
Operating loss since acquisition								$ 13,900,000
Portola Pharmaceuticals, Inc.
Schedule Of Asset Acquisition, By Acquisition [Line Items]
Total acquisition value, per share (in dollars per share)	$ 18.00
Upfront payment to shareholders and option holders	$ 1,380,800,000
Goodwill adjustments						(600,000)
Upfront payment, fair value of equity compensation attributable to the post-combination service period	(11,100,000)
Deferred tax assets, net	116,600,000
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable	41,500,000
Fair value of replacement equity awards attributable to the pre-combination period	7,200,000
Repayments of debt	196,900,000
Inventories, including noncurrent portion of $169.1 and validation batches of $60.9	362,500,000
Validation batches	$ 60,900,000
Fair Value Inputs, Discount Rate	17.50%
Deferred tax assets, net operating loss carryforward	$ 301,600
Deferred tax assets, income tax credits	41,800
Deferred tax assets, royalty debt	42,400
Deferred tax assets, other differences	39,300
Deferred tax liabilities, intangible assetes	245,100
Deferred tax liabilities, inventory	63,400
Portola Pharmaceuticals, Inc. | HealthCare Royalty Partners | Royalty-Based Financing Agreement
Schedule Of Asset Acquisition, By Acquisition [Line Items]
Total repayment obligation as of December 31, 2020	276,900,000					$ 271,900,000			$ 271,900,000
Outstanding debt	182,000,000.0
Portola Pharmaceuticals, Inc. | Purchased technology
Schedule Of Asset Acquisition, By Acquisition [Line Items]
Purchased techonology	$ 1,036,000,000.0
Finite-Lived Intangible Asset, Useful Life	10 years
Portola Pharmaceuticals, Inc. | ANDEXXA
Schedule Of Asset Acquisition, By Acquisition [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Fair Value Inputs, Discount Rate	17.50%
Danicopan | Achillion
Schedule Of Asset Acquisition, By Acquisition [Line Items]
Contingent value rights per share (in dollars per share)		$ 1.00
ACH-5528, Phase 3 | Achillion
Schedule Of Asset Acquisition, By Acquisition [Line Items]
Contingent value rights per share (in dollars per share)		$ 1.00
Minimum | Purchased technology
Schedule Of Asset Acquisition, By Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life					6 years
Minimum | Achillion
Schedule Of Asset Acquisition, By Acquisition [Line Items]
Estimated milestone payments		$ 0
Minimum | Portola Pharmaceuticals, Inc.
Schedule Of Asset Acquisition, By Acquisition [Line Items]
Fair Value Inputs, Discount Rate	3.30%
Maximum | Purchased technology
Schedule Of Asset Acquisition, By Acquisition [Line Items]
Finite-Lived Intangible Asset, Useful Life					16 years
Maximum | Achillion
Schedule Of Asset Acquisition, By Acquisition [Line Items]
Estimated milestone payments		$ 306,300,000
Maximum | Portola Pharmaceuticals, Inc.
Schedule Of Asset Acquisition, By Acquisition [Line Items]
Fair Value Inputs, Discount Rate	7.10%
Acquisition-related contingent consideration | Minimum | Level 3
Schedule Of Asset Acquisition, By Acquisition [Line Items]
Fair value inputs, cost of debt		2.10%			2.50%				2.80%
Fair Value Inputs, Weighted Average Cost of Capital					9.00%				9.00%
Acquisition-related contingent consideration | Maximum | Level 3
Schedule Of Asset Acquisition, By Acquisition [Line Items]
Fair value inputs, cost of debt		2.30%			3.00%				3.30%
In-process research & development assets (IPR&D)
Schedule Of Asset Acquisition, By Acquisition [Line Items]
Impairment							$ 11,000,000.0
In-process research & development assets (IPR&D) | Achillion
Schedule Of Asset Acquisition, By Acquisition [Line Items]
In-process research & development assets (IPR&D)		$ 918,000,000.0
Net deferred tax liability		$ (205,300,000)
In-process research & development assets (IPR&D) | Portola Pharmaceuticals, Inc.
Schedule Of Asset Acquisition, By Acquisition [Line Items]
In-process research & development assets (IPR&D)	$ 15,000,000.0

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Acquisitions (Summary of Total Consideration) (Details) - USD ($) $ in Millions			3 Months Ended
	Jul. 02, 2020	Jan. 28, 2020	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Consideration
Upfront payment, fair value of equity compensation attributable to the post-combination service period			$ 0.0	$ (25.7)
Contingent consideration			303.5		$ 299.4
Assets Acquired and Liabilities Assumed
Goodwill			5,100.1		$ 5,100.1
Portola Pharmaceuticals
Consideration
Fair value of equity shares held by Alexion at closing	$ 47.8
Achillion
Consideration
Upfront payment to shareholders and option holders		$ 926.2
Upfront payment, fair value of equity compensation attributable to the post-combination service period		(20.0)		$ (25.7)
Upfront cash paid, net		906.2
Contingent consideration		160.7	$ 212.8
Contingent consideration, fair value of equity compensation attributable to the post-combination service period		(5.7)
Total consideration		1,061.2
Assets Acquired and Liabilities Assumed
Cash and cash equivalents		68.5
Marketable securities		106.1
Deferred tax assets, net		142.4
Goodwill		37.8
Deferred tax liabilities, net		(62.9)
Other assets and liabilities, net		(6.3)
Total net assets acquired		1,061.2
Portola Pharmaceuticals, Inc.
Consideration
Upfront payment to shareholders and option holders	1,380.8
Upfront payment, fair value of equity compensation attributable to the post-combination service period	(11.1)
Upfront cash paid, net	1,369.7
Fair value of replacement equity awards attributable to the pre-combination period	7.2
Total consideration to acquire outstanding equity, net	1,424.7
Repayments of debt	196.9
Total consideration	1,621.6
Assets Acquired and Liabilities Assumed
Cash and cash equivalents	288.5
Marketable securities	17.8
Inventories, including noncurrent portion of $169.1 and validation batches of $60.9	362.5
Noncurrent inventory	169.1
Validation batches	60.9
Intangible assets	1,051.0
Deferred tax assets, net	116.6
Other assets	41.9
Goodwill	24.9
Accounts payable and accrued expenses	(75.6)
Long-term debt, including current portion of $7.7	(182.0)
Current debt	7.7
Other liabilities	(24.0)
Total net assets acquired	1,621.6
In-process research & development assets (IPR&D) | Achillion
Assets Acquired and Liabilities Assumed
In-process research & development assets (IPR&D)		918.0
Deferred tax liabilities, net		$ (205.3)
In-process research & development assets (IPR&D) | Portola Pharmaceuticals, Inc.
Assets Acquired and Liabilities Assumed
In-process research & development assets (IPR&D)	$ 15.0

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Acquisitions (Pro Forma Information) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Business Combinations [Abstract]
Pro forma revenue	$ 1,444.8	$ 1,140.4
Pro forma net income	$ 574.9	$ 515.7

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Acquisitions (Acquisition-Related Costs) (Details) - USD ($) $ in Millions			3 Months Ended
	Jul. 02, 2020	Jan. 28, 2020	Mar. 31, 2021	Mar. 31, 2020
Business Acquisition [Line Items]
Transaction costs			$ 5.4	$ 1.4
Integration costs			4.1	0.1
Fair value of equity compensation attributable to the post-combination service period			0.0	25.7
Restructuring-related costs			3.7	10.9
Acquisition-related costs			13.2	38.1
AstraZeneca
Business Acquisition [Line Items]
Acquisition-related costs			8.2
Portola Pharmaceuticals, Inc.
Business Acquisition [Line Items]
Fair value of equity compensation attributable to the post-combination service period	$ 11.1
Acquisition-related costs			5.0
Achillion
Business Acquisition [Line Items]
Fair value of equity compensation attributable to the post-combination service period		$ 20.0		$ 25.7
Acquisition-related costs			$ 38.1

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Inventories (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Inventory [Line Items]
Raw materials	$ 97.8	$ 91.2
Work-in-process	324.7	260.8
Finished goods	489.6	510.3
Inventory, Net	912.1	862.3
Inventories
Inventory [Line Items]
Inventory, Net	803.9	775.7
Other assets
Inventory [Line Items]
Inventory, Net	108.2	86.6
Pre Approval Inventory
Inventory [Line Items]
Inventory, Net	$ 86.1	$ 39.8

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Intangible Assets and Goodwill (Schedule of Intangible Assets and Goodwill) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Jun. 30, 2020	Dec. 31, 2020
Finite-Lived Intangible Assets [Line Items]
Intangible Assets, Cost	$ 6,836.4		$ 6,736.4
Intangible Assets, Accumulated Amortization	(3,788.1)		(3,734.0)
Intangible assets	3,048.3		3,002.4
Goodwill, Gross	5,103.0		5,103.0
Goodwill, Accumulated Amortization	(2.9)		(2.9)
Goodwill	5,100.1		5,100.1
Licensing rights
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	57.0		57.0
Finite-Lived Intangible Assets, Accumulated Amortization	(39.4)		(38.5)
Net	$ 17.6		18.5
Patents
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	7 years
Finite-Lived Intangible Assets, Gross	$ 10.5		10.5
Finite-Lived Intangible Assets, Accumulated Amortization	(10.5)		(10.5)
Net	0.0		0.0
Purchased technology
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	5,746.5		5,746.5
Finite-Lived Intangible Assets, Accumulated Amortization	(3,737.9)		(3,684.7)
Net	$ 2,008.6		2,061.8
Impairment		$ 2,042.3
Other intangibles
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	5 years
Finite-Lived Intangible Assets, Gross	$ 0.4		0.4
Finite-Lived Intangible Assets, Accumulated Amortization	(0.3)		(0.3)
Net	$ 0.1		0.1
Minimum | Licensing rights
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	3 years
Minimum | Purchased technology
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	6 years
Maximum | Licensing rights
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	8 years
Maximum | Purchased technology
Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Asset, Useful Life	16 years
Priority review voucher
Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets, Gross (Excluding Goodwill)	$ 100.0		0.0
Indefinite-lived Intangible Assets (Excluding Goodwill)	100.0		0.0
In-process research & development assets (IPR&D)
Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets, Gross (Excluding Goodwill)	922.0		922.0
Indefinite-lived Intangible Assets (Excluding Goodwill)	$ 922.0		$ 922.0
Impairment		$ 11.0

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Intangible Assets and Goodwill (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended	3 Months Ended
	Jan. 31, 2021	Mar. 31, 2021	Mar. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]
Amortization of purchased intangible assets		$ 54.1	$ 74.7
2021 (remainder)		162.4
2022		216.0
2023		216.0
2024		216.0
2025		216.0
2026		$ 216.0
Priority review voucher
Goodwill [Line Items]
Indefinite-lived Intangible Assets Acquired	$ 100.0

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Debt (Details) - USD ($)		1 Months Ended	3 Months Ended		12 Months Ended
	Jul. 02, 2020	Feb. 28, 2017	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2018	Dec. 31, 2020	Jun. 07, 2018	May 31, 2018
Debt Instrument [Line Items]
Amortization of deferred financing costs				$ 1,200,000
Remaining unamortized deferred financing costs				9,900,000		$ 11,100,000
Current portion of long-term debt				143,200,000		142,400,000
Long-term debt, less current portion				2,388,800,000		2,419,600,000
Portola Pharmaceuticals, Inc.
Debt Instrument [Line Items]
Deferred tax assets, royalty debt	$ 42,400
Repayments of debt	196,900,000
Credit Agreement
Debt Instrument [Line Items]
Payments of financing costs					$ 53,100,000
Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity							$ 1,000,000,000.0
Letters of credit, amount outstanding				1,000,000.0
Credit Agreement | Senior Secured Term Loan | Line of Credit
Debt Instrument [Line Items]
Debt instrument, principal amount							$ 2,612,500,000
Debt Instrument, quarterly payment as a percent of total borrowings							5.00%
Debt Instrument, Periodic Payment				(32,600,000)
Outstanding debt				2,351,300,000
Royalty-Based Financing Agreement | HealthCare Royalty Partners
Debt Instrument [Line Items]
Outstanding debt				$ 188,700,000		187,000,000.0
Debt Instrument, Interest Rate, Effective Percentage				11.40%
Interest Expense, Debt				$ 5,000,000.0
Repayments of debt				3,300,000
Current portion of long-term debt				16,300,000		15,500,000
Long-term debt, less current portion				$ 172,400,000		171,500,000
Royalty-Based Financing Agreement | HealthCare Royalty Partners | Portola Pharmaceuticals, Inc.
Debt Instrument [Line Items]
Outstanding debt	182,000,000.0
Total repayment obligation as of December 31, 2020	276,900,000					$ 271,900,000
Debt Instrument, Unamortized Discount	94,900,000
Royalty-Based Financing Agreement | HealthCare Royalty Partners | Portola Pharmaceuticals, Inc.
Debt Instrument [Line Items]
Royalty Agreement, Closing Day Payment		$ 50,000,000.0
Royalty Agreement, Milestone Payment Based On Regulatory Approval								$ 100,000,000.0
Royalty Agreement, Maximum Potential Royalty Payments As A Percentage Of Funding Received		195.00%
Royalty Agreement, Maximum Potential Royalty Payments		$ 290,600,000
Repayments of debt	$ 13,700,000
Royalty-Based Financing Agreement | HealthCare Royalty Partners | Portola Pharmaceuticals, Inc. | Minimum
Debt Instrument [Line Items]
Royalty Agreement, Tiered Royalty, Percent		4.20%
Royalty-Based Financing Agreement | HealthCare Royalty Partners | Portola Pharmaceuticals, Inc. | Maximum
Debt Instrument [Line Items]
Royalty Agreement, Tiered Royalty, Percent		8.50%
Royalty-Based Financing Agreement | Forecast [Member] | HealthCare Royalty Partners
Debt Instrument [Line Items]
Repayments of debt			$ 2,500,000

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Debt (Schedule of Debt) (Details) - USD ($) $ in Millions		3 Months Ended
	Jul. 02, 2020	Mar. 31, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Less: Interest to be accreted in future periods		$ (79.9)
Portola Pharmaceuticals, Inc.
Debt Instrument [Line Items]
Less: Payments made	$ (196.9)
HealthCare Royalty Partners | Royalty-Based Financing Agreement
Debt Instrument [Line Items]
Less: Payments made		(3.3)
Outstanding debt		$ 188.7	$ 187.0
HealthCare Royalty Partners | Portola Pharmaceuticals, Inc. | Royalty-Based Financing Agreement
Debt Instrument [Line Items]
Total repayment obligation as of December 31, 2020	276.9		$ 271.9
Outstanding debt	$ 182.0

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Earnings Per Common Share (Summary Of Calculation Of Basic And Diluted Earnings Per Share) (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Common Share [Abstract]
Net income attributable to Alexion	$ 636.0	$ 557.6
Shares used in computing earnings per common share—basic (in shares)	220.1	221.6
Stock awards (in shares)	2.5	1.0
Shares used in computing earnings per common share-diluted (in shares)	222.6	222.6
Earnings per common share attributable to Alexion:
Basic (in dollars per share)	$ 2.89	$ 2.52
Diluted (in dollars per share)	$ 2.86	$ 2.50

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Earnings Per Common Share (Narrative) (Details) - shares shares in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0.8	3.2

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Marketable Securities (Proceeds from Sale) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Proceeds from maturities and sales	$ 0.0	$ 812.5
Realized gains	0.0	0.0
Realized losses	$ 0.0	$ 0.0

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Marketable Securities (Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Investments, Debt and Equity Securities [Abstract]
Trading securities. fair value	$ 39.7	$ 34.9

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Derivative Instruments and Hedging Activities (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Designated as Hedging Instrument
Derivative [Line Items]
Foreign Exchange Forward Contracts Term	23 months
Not Designated as Hedging Instrument
Derivative [Line Items]
Foreign Exchange Forward Contracts Term	3 months
Gain (Loss) on Fair Value Hedges Recognized in Earnings	$ 12.2	$ 16.2
Foreign exchange forward contracts | Designated as Hedging Instrument
Derivative [Line Items]
Notional amount of derivative instruments	853.3
Foreign exchange forward contracts | Designated as Hedging Instrument | Revenue
Derivative [Line Items]
Estimated gains (losses) to be reclassified from other comprehenisve income in next 12 months	9.7
Foreign exchange forward contracts | Not Designated as Hedging Instrument
Derivative [Line Items]
Notional amount of derivative instruments	1,126.5
Interest rate contracts | Designated as Hedging Instrument
Derivative [Line Items]
Estimated gains (losses) to be reclassified from other comprehenisve income in next 12 months	$ (45.7)

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Derivative Instruments and Hedging Activities (Schedule of Interest Rate Contracts) (Details) - Designated as Hedging Instrument - Interest Rate Swap $ in Millions	Mar. 31, 2021 USD ($)
Derivative [Line Items]
Derivative, notional amount	$ 450.0
Derivative, notional amount	$ 1,300.0
Minimum
Derivative [Line Items]
Derivative, fixed interest rate	2.60%
Minimum
Derivative [Line Items]
Derivative, fixed interest rate	2.37%
Maximum
Derivative [Line Items]
Derivative, fixed interest rate	2.79%
Maximum
Derivative [Line Items]
Derivative, fixed interest rate	2.83%

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Derivative Instruments and Hedging Activities (Schedule Of Other Comprehensive Income And Earnings From Foreign Exchange Contracts) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Total revenues	$ 1,636.5	$ 1,444.8
Interest expense	(27.1)	(25.8)
Foreign exchange forward contracts | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	33.4	26.0
Foreign exchange forward contracts | Sales | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	(9.1)	8.8
Interest rate contracts | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, before Tax	1.0	(47.3)
Interest rate contracts | Interest Expense | Cash Flow Hedging
Derivative Instruments, Gain (Loss) [Line Items]
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, after Tax	(8.8)	(3.6)
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) from Hedging Activities
Derivative Instruments, Gain (Loss) [Line Items]
Total revenues	(11.8)	11.4
Interest expense	11.4	4.6
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) from Hedging Activities | Foreign exchange forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total revenues	(11.8)	11.4
Interest expense	0.0	0.0
Reclassification out of Accumulated Other Comprehensive Income | Unrealized Gains (Losses) from Hedging Activities | Interest rate contracts
Derivative Instruments, Gain (Loss) [Line Items]
Total revenues	0.0	0.0
Interest expense	$ 11.4	$ 4.6

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Derivative Instruments and Hedging Activities (Schedule Of Fair Value Of Outstanding Derivatives) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	$ 41.6	$ 26.1
Liability Derivatives, Fair Value	100.2	172.6
Foreign exchange forward contracts
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	41.6	26.1
Liability Derivatives, Fair Value	100.2	172.6
Foreign exchange forward contracts | Other current liabilities | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	9.4	44.3
Foreign exchange forward contracts | Other assets | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	0.1	0.0
Foreign exchange forward contracts | Other liabilities | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	0.0	1.2
Foreign exchange forward contracts | Prepaid expenses and other current assets | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	19.2	0.0
Interest rate contracts | Other current liabilities | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	45.7	45.9
Interest rate contracts | Other liabilities | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	32.9	45.4
Foreign exchange forward contracts | Foreign exchange forward contracts | Other current liabilities | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Liability Derivatives, Fair Value	12.2	35.8
Foreign exchange forward contracts | Foreign exchange forward contracts | Prepaid expenses and other current assets | Not Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Asset Derivatives, Fair Value	22.3	26.1
Interest rate contracts | Interest rate contracts | Other assets | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Interest Rate Derivative Assets, at Fair Value	0.0	0.0
Interest rate contracts | Interest rate contracts | Prepaid expenses and other current assets | Designated as Hedging Instrument
Derivatives, Fair Value [Line Items]
Interest Rate Derivative Assets, at Fair Value	$ 0.0	$ 0.0

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Derivative Instruments and Hedging Activities (Offsetting Assets and Liabilities) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Amounts of Recognized Assets	$ 41.6	$ 26.1
Derivative Liability, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Amounts of Recognized Liabilities	(100.2)	(172.6)
Foreign exchange forward contracts
Derivative Asset, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Amounts of Recognized Assets	41.6	26.1
Gross Amounts Offset in the Condensed Consolidated Balance Sheet	0.0	0.0
Amounts of Assets Presented in the Condensed Consolidated Balance Sheet	41.6	26.1
Derivative Financial Instruments	(21.3)	(26.1)
Cash Collateral Received	0.0	0.0
Net Amount	20.3	0.0
Derivative Liability, Fair Value, Amount Offset Against Collateral [Abstract]
Gross Amounts of Recognized Liabilities	(100.2)	(172.6)
Gross Amounts Offset in the Condensed Consolidated Balance Sheet	0.0	0.0
Amounts of Liabilities Presented in the Condensed Consolidated Balance Sheet	(100.2)	(172.6)
Derivative Financial Instruments	21.3	26.1
Cash Collateral Pledged	0.0	0.0
Net Amount	$ (78.9)	$ (146.5)

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Caelum Biosciences - Narrative (Details) - USD ($) $ in Millions	1 Months Ended				3 Months Ended
	Mar. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Jan. 31, 2019	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019	Sep. 30, 2020
Noncontrolling Interest [Line Items]
Other income and (expense)					$ 0.5	$ (0.9)
VIE noncontrolling interest upon consolidation					161.0
Net loss attributable to noncontrolling interest					$ 146.8	0.0
Caelum
Noncontrolling Interest [Line Items]
Ownership percentage	33.30%				33.30%
Variable Interest Entity, Primary Beneficiary
Noncontrolling Interest [Line Items]
Noncontrolling interest, preferred equity	$ 46.0				$ 46.0
VIE noncontrolling interest upon consolidation	161.0
Net assets acquired	217.0				217.0
Net loss attributable to noncontrolling interest					196.0
In-process research & development assets (IPR&D)	193.3				193.3
Net loss attributable to noncontrolling interest					146.8
Caelum
Noncontrolling Interest [Line Items]
Other income and (expense)							$ 32.0
Derecognized equity investment	41.0				41.0
Caelum Biosciences, Option
Noncontrolling Interest [Line Items]
Impairment		$ 49.0
Option, derecognized amount	$ 15.0				15.0
Collaborative Arrangement | Caelum
Noncontrolling Interest [Line Items]
Equity method investment				$ 57.1
Caelum | Collaborative Arrangement
Noncontrolling Interest [Line Items]
Upfront payment				30.0
Potential future payments, milestone achievement				$ 30.0
Derivative liability								$ 27.1	$ 0.0
Potential future payments							20.0
Payment for additional equity interest			$ 60.0
Milestone payments to be made in next 12 months					14.0
Maximum potential future payment					500.0
Upfront option exercise payment					150.0
Maximum regulatory and commercial milestone payments					$ 350.0
Derivative change in fair value						$ 2.3
Caelum | Collaborative Arrangement | Minimum
Noncontrolling Interest [Line Items]
Fair value inputs, cost of debt								3.30%
Caelum | Collaborative Arrangement | Maximum
Noncontrolling Interest [Line Items]
Fair value inputs, cost of debt								3.50%
Caelum | Collaborative Agreement, Amendment
Noncontrolling Interest [Line Items]
Research and development							$ 4.1

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Caelum Biosciences - Net Assets Assumed (Details) - Variable Interest Entity, Primary Beneficiary $ in Millions	Mar. 31, 2021 USD ($)
Noncontrolling Interest [Line Items]
Cash and cash equivalents	$ 16.9
In-process research & development assets (IPR&D)	193.3
Other assets and liabilities, net	6.8
Total net assets acquired	$ 217.0

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Caelum Biosciences - Carrying Value (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Noncontrolling Interest [Line Items]
Cash and cash equivalents	$ 3,429.6	$ 2,964.5	$ 2,315.0
Prepaid expenses and other current assets	706.4	648.6
Other assets	447.0	506.2
Accounts payable	125.3	118.6
Accrued expenses	910.7	$ 1,084.7
Variable Interest Entity, Primary Beneficiary
Noncontrolling Interest [Line Items]
Cash and cash equivalents	56.5
Prepaid expenses and other current assets	8.6
Other assets	7.8
Accounts payable	3.6
Accrued expenses	$ 2.3

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Other Investments (Details) - USD ($) $ in Millions			1 Months Ended					3 Months Ended
	Jul. 17, 2020	Jul. 02, 2020	Apr. 30, 2020	Mar. 31, 2020	Sep. 30, 2019	Mar. 31, 2019	Oct. 31, 2018	Mar. 31, 2021	Mar. 31, 2020	Jan. 31, 2021	Dec. 31, 2020
Schedule of Equity Method Investments [Line Items]
Unrealized Gain (Loss) on Investments								$ (9.6)	$ (9.2)
Payments to Acquire Other Investments								0.0	34.5
Gain (Loss) on Disposition of Assets								25.3	0.0
Dicerna
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Equity Method Investments							$ 10.3
Unrealized Gain (Loss) on Investments								3.0	(3.1)
Equity Securities, FV-NI								21.4			$ 18.4
Zealand
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Equity Method Investments						$ 13.8
Unrealized Gain (Loss) on Investments								(2.5)	(0.2)
Equity Securities, FV-NI								25.4			29.1
Eidos
Schedule of Equity Method Investments [Line Items]
Payments to Acquire Equity Method Investments					$ 19.9
Unrealized Gain (Loss) on Investments								(9.8)	(3.7)
Equity Securities, FV-NI								63.4			73.2
BridgeBio
Schedule of Equity Method Investments [Line Items]
Shares received per share of previously held stock (in shares)										1.85
Portola Pharmaceuticals
Schedule of Equity Method Investments [Line Items]
Unrealized Gain (Loss) on Investments									$ 0.6
Equity Securities, FV-NI		$ 47.8
Payments to Acquire Other Investments			$ 3.6	$ 14.5
Equity Method Investment, Realized Gain (Loss) on Disposal		$ 29.7
Inozyme
Schedule of Equity Method Investments [Line Items]
Unrealized Gain (Loss) on Investments								1.5
Equity Securities, FV-NI								22.0			20.5
Gain (Loss) on Disposition of Assets	$ 14.8
Other Equity Securities
Schedule of Equity Method Investments [Line Items]
Equity Securities, FV-NI								$ 5.8			$ 2.6

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Stockholders' Equity (Details) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2021	Jul. 28, 2020	Oct. 22, 2019	Feb. 28, 2017
Class of Stock [Line Items]
Treasury Stock, Shares, Acquired	1.3
Treasury Stock, Value, Acquired, Cost Method	$ 107.1
Common Stock
Class of Stock [Line Items]
Repurchase authorization amount			$ 1,500.0	$ 1,000.0	$ 1,000.0
Remaining authorized repurchase amount		$ 2,024.7

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Other Comprehensive Income and Accumulated Other Comprehensive Income (Changes in AOCI) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	$ (124.6)	$ (66.8)
Other comprehensive income (loss) before reclassifications	21.5	(29.5)
Amounts reclassified from other comprehensive income	17.9	(5.2)
Other comprehensive income (loss), net of tax	39.4	(34.7)
Ending Balance	(85.2)	(101.5)
Defined Benefit Pension Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(10.2)	(9.2)
Other comprehensive income (loss) before reclassifications	0.0	0.0
Amounts reclassified from other comprehensive income	0.0	0.0
Other comprehensive income (loss), net of tax	0.0	0.0
Ending Balance	(10.2)	(9.2)
Unrealized Gains (Losses) from Debt Securities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	0.0	(0.1)
Other comprehensive income (loss) before reclassifications	0.0	(0.2)
Amounts reclassified from other comprehensive income	0.0	0.0
Other comprehensive income (loss), net of tax	0.0	(0.2)
Ending Balance	0.0	(0.3)
Unrealized Gains (Losses) from Hedging Activities
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(102.7)	(40.1)
Other comprehensive income (loss) before reclassifications	34.6	(21.3)
Amounts reclassified from other comprehensive income	17.9	(5.2)
Other comprehensive income (loss), net of tax	52.5	(26.5)
Ending Balance	(50.2)	(66.6)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning Balance	(11.7)	(17.4)
Other comprehensive income (loss) before reclassifications	(13.1)	(8.0)
Amounts reclassified from other comprehensive income	0.0	0.0
Other comprehensive income (loss), net of tax	(13.1)	(8.0)
Ending Balance	$ (24.8)	$ (25.4)

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Other Comprehensive Income and Accumulated Other Comprehensive Income (Significant Reclassifications from AOCI) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total revenues	$ 1,636.5	$ 1,444.8
Interest expense	27.1	25.8
Income before income taxes	602.6	663.6
Income tax provision	(113.4)	(106.0)
Net income attributable to Alexion	636.0	557.6
Unrealized Gains (Losses) from Hedging Activities | Reclassification out of Accumulated Other Comprehensive Income
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Total revenues	(11.8)	11.4
Interest expense	(11.4)	(4.6)
Income before income taxes	(23.2)	6.8
Income tax provision	5.3	(1.6)
Net income attributable to Alexion	$ (17.9)	$ 5.2

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Fair Value Measurement (Schedule Of Assets And Liabilites Measured At Fair Value) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current portion of contingent consideration	$ 120.0	$ 114.9
Contingent consideration	303.5	299.4
Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities
Foreign exchange forward contracts | Other current liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange forward contracts, liability	21.6	80.1
Foreign exchange forward contracts | Other current liabilities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange forward contracts, liability	0.0	0.0
Foreign exchange forward contracts | Other current liabilities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange forward contracts, liability	21.6	80.1
Foreign exchange forward contracts | Other current liabilities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange forward contracts, liability	0.0	0.0
Foreign exchange forward contracts | Other liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange forward contracts, liability		1.2
Foreign exchange forward contracts | Other liabilities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange forward contracts, liability		0.0
Foreign exchange forward contracts | Other liabilities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange forward contracts, liability		1.2
Foreign exchange forward contracts | Other liabilities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange forward contracts, liability		0.0
Acquisition-related contingent consideration | Current portion of contingent consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current portion of contingent consideration	120.0	114.9
Acquisition-related contingent consideration | Current portion of contingent consideration | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current portion of contingent consideration	0.0	0.0
Acquisition-related contingent consideration | Current portion of contingent consideration | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current portion of contingent consideration	0.0	0.0
Acquisition-related contingent consideration | Current portion of contingent consideration | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Current portion of contingent consideration	120.0	114.9
Acquisition-related contingent consideration | Contingent consideration
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	303.5	299.4
Acquisition-related contingent consideration | Contingent consideration | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	0.0	0.0
Acquisition-related contingent consideration | Contingent consideration | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	0.0	0.0
Acquisition-related contingent consideration | Contingent consideration | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration	303.5	299.4
Money market funds | Cash equivalents
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,258.8	833.7
Money market funds | Cash equivalents | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0.0	0.0
Money market funds | Cash equivalents | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	1,258.8	833.7
Money market funds | Cash equivalents | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0.0	0.0
Mutual funds | Marketable securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	39.7	34.9
Mutual funds | Marketable securities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	39.7	34.9
Mutual funds | Marketable securities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0.0	0.0
Mutual funds | Marketable securities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0.0	0.0
Equity securities | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	137.4	143.2
Equity securities | Other assets | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	137.4	122.7
Equity securities | Other assets | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0.0	20.5
Equity securities | Other assets | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Marketable securities	0.0	0.0
Foreign exchange forward contracts | Prepaid expenses and other current assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange forward contracts, asset	41.5	26.1
Foreign exchange forward contracts | Prepaid expenses and other current assets | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange forward contracts, asset	0.0	0.0
Foreign exchange forward contracts | Prepaid expenses and other current assets | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange forward contracts, asset	41.5	26.1
Foreign exchange forward contracts | Prepaid expenses and other current assets | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange forward contracts, asset	0.0	0.0
Foreign exchange forward contracts | Other assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange forward contracts, asset	0.1
Foreign exchange forward contracts | Other assets | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange forward contracts, asset	0.0
Foreign exchange forward contracts | Other assets | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange forward contracts, asset	0.1
Foreign exchange forward contracts | Other assets | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Foreign exchange forward contracts, asset	0.0
Interest rate contracts | Other current liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	45.7	45.9
Interest rate contracts | Other current liabilities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	0.0	0.0
Interest rate contracts | Other current liabilities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	45.7	45.9
Interest rate contracts | Other current liabilities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	0.0	0.0
Interest rate contracts | Other liabilities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	32.9	45.4
Interest rate contracts | Other liabilities | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	0.0	0.0
Interest rate contracts | Other liabilities | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	32.9	45.4
Interest rate contracts | Other liabilities | Level 3
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Interest Rate Derivative Liabilities, at Fair Value	$ 0.0	$ 0.0

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Fair Value Measurement (Schedule Of Acquisition-Related Contingent Consideration) (Details) - USD ($) $ in Millions		3 Months Ended	12 Months Ended
	Jan. 28, 2020	Mar. 31, 2021	Dec. 31, 2020
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair Value Inputs, Weighted Average Cost of Capital		11.50%
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, Low		$ 0.0
Business Combination, Contingent Consideration, Arrangements, Range of Outcomes, Value, High		905.6
Business Combination, Contingent Consideration Arrangements, Expected Payments Next Twelve Months		120.0
Acquisition-related contingent consideration | Contingent consideration
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Business Combination, Contingent Consideration, Liability		423.5
Acquisition-related contingent consideration | Level 3
Acquisition-Related Contingent Consideration [Roll Forward]
Balance at beginning of period		414.3
Change in fair value		9.2
Balance at end of period		$ 423.5	$ 414.3
Acquisition-related contingent consideration | Minimum | Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs, cost of debt	2.10%	2.50%	2.80%
Fair Value Inputs, Weighted Average Cost of Capital		9.00%	9.00%
Acquisition-related contingent consideration | Maximum | Level 3
Fair Value Inputs, Liabilities, Quantitative Information [Line Items]
Fair value inputs, cost of debt	2.30%	3.00%	3.30%

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Revenue Recognition (Disaggregation of Revenue by Product and Geographical Region) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	$ 1,636.5	$ 1,444.8
SOLIRIS
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	1,027.6	1,022.9
ULTOMIRIS
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	346.9	222.8
STRENSIQ
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	197.5	172.2
ANDEXXA
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	28.9	0.0
KANUMA
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	34.8	26.7
United States | SOLIRIS
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	553.9	556.2
United States | ULTOMIRIS
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	206.9	131.5
United States | STRENSIQ
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	155.2	128.1
United States | ANDEXXA
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	25.3	0.0
United States | KANUMA
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	17.1	16.4
Europe | SOLIRIS
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	251.3	263.5
Europe | ULTOMIRIS
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	63.8	33.8
Europe | STRENSIQ
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	18.9	24.0
Europe | ANDEXXA
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	3.6	0.0
Europe | KANUMA
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	10.8	7.5
Asia Pacific | SOLIRIS
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	102.4	87.1
Asia Pacific | ULTOMIRIS
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	73.3	57.1
Asia Pacific | STRENSIQ
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	17.0	13.6
Asia Pacific | ANDEXXA
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	0.0	0.0
Asia Pacific | KANUMA
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	1.2	0.9
Rest of World | SOLIRIS
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	120.0	116.1
Rest of World | ULTOMIRIS
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	2.9	0.4
Rest of World | STRENSIQ
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	6.4	6.5
Rest of World | ANDEXXA
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	0.0	0.0
Rest of World | KANUMA
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	5.7	1.9
Product
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Total Net Product Sales	$ 1,635.7	$ 1,444.6

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Revenue Recognition (Summary of Receivables and Contract Liabilities from Contracts) (Details) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020
Revenue from Contract with Customer [Abstract]
Receivables, which are included in Trade accounts receivable, net	$ 1,473.0	$ 1,409.3
Contract liabilities, which are included in Other current liabilities	$ 23.8	$ 3.0

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Income Taxes (Schedule of Income Tax Provision and Effective Tax Rate) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Income Tax Disclosure [Abstract]
Income tax expense	$ 113.4	$ 106.0
Effective income tax rate	18.80%	16.00%

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Income Taxes (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2021 USD ($)
Noncontrolling Interest [Line Items]
Effective Income Tax Rate Reconciliation, Noncontrolling Interest Income (Loss), Percent	5.20%
Variable Interest Entity, Primary Beneficiary
Noncontrolling Interest [Line Items]
Net loss attributable to noncontrolling interest	$ (196.0)
In-process research & development assets (IPR&D)	$ 193.3

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Commitments and Contingencies (Details) - USD ($) $ in Millions		1 Months Ended						3 Months Ended
	Jul. 02, 2020	Sep. 30, 2019	Apr. 30, 2019	Mar. 31, 2019	Jan. 31, 2019	Nov. 30, 2018	Oct. 31, 2018	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Dec. 31, 2017	Apr. 28, 2021
Other Commitments [Line Items]
Research and development								$ 289.1	$ 200.9
Collaboration Agreement, Milestone Payments To Be Made Next Twelve Months								155.1
Gain (Loss) on Disposition of Assets								25.3	$ 0.0
Canadian Patented Medicine Prices Review Board
Other Commitments [Line Items]
Loss Contingency, Estimate of Possible Loss								54.7
Canadian Patented Medicine Prices Review Board | Subsequent Event
Other Commitments [Line Items]
Escrow Deposit																$ 80.9
SEC
Other Commitments [Line Items]
Litigation Settlement, Amount Awarded to Other Party	$ 21.5
DOJ And OIG
Other Commitments [Line Items]
Loss Contingency Accrual, Payments			$ 13.1
Syntimmune, Inc
Other Commitments [Line Items]
Asset Acquisition, Contingent Consideration, Milestone Payments						$ 800.0
Astellas Pharam [Member]
Other Commitments [Line Items]
Asset Acquisition, Contingent Consideration, Milestone Payments								71.5
Zealand
Other Commitments [Line Items]
Payments to Acquire Equity Method Investments				$ 13.8
Eidos
Other Commitments [Line Items]
Payments to Acquire Equity Method Investments		$ 19.9
Dicerna
Other Commitments [Line Items]
Payments to Acquire Equity Method Investments							$ 10.3
Subcutaneous Formulation | Syntimmune, Inc
Other Commitments [Line Items]
Asset Acquisition, Contingent Consideration, Milestone Payments						$ 130.0
Collaboration and License Agreement
Other Commitments [Line Items]
Potential future payments, milestone achievement								114.1
Zealand | Zealand
Other Commitments [Line Items]
Payments To Acquire Licenses And Equity Investment				40.0
Prepaid Research And Development Expense				$ 5.0								$ 5.0
Research and development												$ 21.2
Potential future payments, milestone achievement								610.0
Collaboration Agreement, Potential Future Payments, Additional Milestone Achievement								115.0
Collaboration Agreement, Potential Future Payments, Option Fee								15.0
Eidos | Affibody AB
Other Commitments [Line Items]
Payments To Acquire Licenses And Equity Investment		$ 50.0
Research and development											$ 30.1
Potential future payments, milestone achievement								30.0
Dicerna | Dicerna Pharmaceutical Collaboration Agreement
Other Commitments [Line Items]
Payments To Acquire Licenses And Equity Investment							$ 37.0
Research and development										$ 20.0			$ 26.7
Research and Development Arrangement, Potential Payment, Maximum								604.1
Halozyme Therapeutics, Inc | License Agreement 1
Other Commitments [Line Items]
Research and Development Arrangement, Potential Payment, Maximum								155.0
Research and development															$ 40.0
Research and Development Agreement, Option Fee								8.0
Research and Development Arrangement, Potential Contingent Payment, Maximum								160.0
Caelum | Collaborative Arrangement
Other Commitments [Line Items]
Potential future payments, milestone achievement					$ 30.0
Milestone payments to be made in next 12 months								14.0
Maximum potential future payment								500.0
Upfront option exercise payment								150.0
Maximum regulatory and commercial milestone payments								350.0
Origin Biosciences
Other Commitments [Line Items]
Gain (Loss) on Disposition of Assets								20.0						$ 3.5
Asset Sale, Contingent Payments To Be Received								21.0
Other Third Party Manufacturers
Other Commitments [Line Items]
Remaining total commitments								125.7
Lonza Group AG
Other Commitments [Line Items]
Remaining total commitments								1,432.1
Unrecorded Unconditional Purchase Obligation, Undiscounted Fixed Payment Amount								$ 97.9