UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2014

o TRANSITION REPORT UNDER SECTION 13 OF 15(d) OF THE EXCHANGE ACT OF 1934

From the transition period from to .

Commission File Number 001-35798

KALOBIOS PHARMACEUTICALS, INC.

(Exact name of registrant as specified in its charter)

Delaware		77-0557236
(State or other jurisdiction of		(IRS Employer
incorporation)		Identification No.)

260 East Grand Avenue, South San Francisco, CA, 94080

(Address of principal executive offices)

(Zip Code)

Registrant’s telephone number, including area code: (650) 243-3100

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

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes x No o

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

Large accelerated filer o		Accelerated filer x

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

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

As of May 6, 2014, there were 32,981,396 shares of common stock of the issuer outstanding.

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PART I. FINANCIAL INFORMATION

Item 1. Financial Statements

KaloBios Pharmaceuticals, Inc.

Condensed Consolidated Balance Sheets

(in thousands, except share and per share data)

	March 31,			December 31,
	2014			2013
	(Unaudited)			(Note 2)
Assets
Current assets:
Cash and cash equivalents	$	33,397		$	54,220
Marketable securities	29,303			22,511
Prepaid expenses and other current assets	765			786
Restricted cash	205			205
Total current assets	63,670			77,722

Restricted cash	193			—
Property and equipment, net	210			276
Marketable securities, non-current	1,692			—
Other assets	814			706
Total assets	$	66,579		$	78,704

Liabilities and stockholders’ equity
Current liabilities:
Accounts payable	$	1,634		$	3,197
Accrued compensation	637			1,091
Accrued research and clinical liabilities	3,691			3,309
Notes payable, short-term	3,187			3,182
Other accrued liabilities	750			603
Total current liabilities	9,899			11,382

Notes payable, long-term	6,006			6,786
Total liabilities	15,905			18,168

Commitments and contingencies (Note 7)
Stockholders’ equity:
Common stock, $0.001 par value: 47,500,000 shares authorized at March 31, 2014 and December 31, 2013; 32,981,396 and 32,931,092 shares issued and outstanding at March 31, 2014, and December 31, 2013, respectively	33			33
Additional paid-in capital	201,265			200,715
Accumulated other comprehensive income (loss)	(1		)	3
Accumulated deficit	(150,623		)	(140,215		)
Total stockholders’ equity	50,674			60,536
Total liabilities and stockholders’ equity	$	66,579		$	78,704

See accompanying notes

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KaloBios Pharmaceuticals, Inc.

Condensed Consolidated Statements of Comprehensive Loss

(in thousands, except share and per share data)

	Three Months Ended March 31,
	2014			2013
	(unaudited)

Contract revenue	$	—		$	16

Operating expenses:
Research and development	7,690			6,320
General and administrative	2,470			2,019
Total operating expenses	10,160			8,339

Loss from operations	(10,160		)	(8,323		)

Other income (expense):
Interest expense	(260		)	(263		)
Interest and other income, net	12			12
Net loss	(10,408		)	(8,574		)
Other comprehensive income (loss):
Net unrealized gains (losses) on marketable securities	(4		)	—
Comprehensive loss	$	(10,412	)	$	(8,574	)

Basic and diluted net loss per common share	$	(0.32	)	$	(0.55	)

Weighted average common shares outstanding used to calculate basic and diluted net loss per common share	32,966,471			15,607,379

See accompanying notes

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KaloBios Pharmaceuticals, Inc.

Condensed Consolidated Statements of Cash Flows

(in thousands)

	Three Months Ended March 31,
	2014			2013
	(unaudited)
Operating activities:
Net loss	$	(10,408	)	$	(8,574	)
Adjustments to reconcile net loss to net cash used in operating activities:
Depreciation and amortization	101			42
Noncash interest expense	45			38
Amortization of premium on marketable securities	59			54
Stock based compensation expense	491			181
Changes in operating assets and liabilities:
Contract receivables	40			53
Prepaid expenses and other assets	(138		)	(1,025		)
Accounts payable	(1,563		)	3,329
Accrued compensation	(454		)	200
Accrued research and clinical liabilities	382			(2,153		)
Other liabilities	155			73
Deferred rent	(8		)	(19		)
Net cash used in operating activities	(11,298		)	(7,801		)

Investing activities:
Purchases of property and equipment	(35		)	(5		)
Purchase of marketable securities	(31,005		)	—
Proceeds from maturities of marketable securities	22,460			2,395
Changes in restricted cash	(193		)	—
Net cash provided by (used in) investing activities	(8,773		)	2,390

Financing activities:
Proceeds from issuance of common stock in initial public offering, net of underwriting costs	—			64,413
Proceeds from the exercise of stock options	59			—
Principal payments under notes payable	(811		)	—
Net cash provided by (used in) financing activities	(752		)	64,413

Net increase (decreases) in cash and cash equivalents	(20,823		)	59,002
Cash and cash equivalents, beginning of period	54,220			10,947
Cash and cash equivalents, end of period	$	33,397		$	69,949

Supplemental cash flow disclosure:
Cash paid for interest	$	219		$	225
Supplemental disclosure of noncash financing activities:
Conversion of preferred stock to common stock and additional paid-in capital	$	—		$	102,023
Reclassification of preferred stock warrants liability to additional paid-in capital	$	—		$	157

See accompanying notes.

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KaloBios Pharmaceuticals, Inc.

Notes to Condensed Consolidated Financial Statements

(Unaudited)

1. Nature of Operations

KaloBios Pharmaceuticals, Inc. (the Company) is a biopharmaceutical company whose primary business is to develop monoclonal antibody therapeutics for diseases that represent a significant burden to society and to patients and their families. The Company’s primary clinical focus is on respiratory diseases and cancer. The Company was incorporated on March 15, 2000 in California and reincorporated as a Delaware corporation in September 2001. All of the Company’s assets are located in California.

The Company has incurred significant losses and had an accumulated deficit of $150.6 million as of March 31, 2014. The Company has financed its operations primarily through the sale of equity securities, grants and the payments received under its agreements with Novartis Pharma AG (Novartis) and Sanofi Pasteur S.A. (Sanofi). The Company completed its initial public offering (IPO) in February 2013. To date, none of the Company’s product candidates have been approved for sale and therefore the Company has not generated any revenue from product sales. Management expects operating losses to continue for the foreseeable future. As a result, the Company will continue to require additional capital through equity offerings, debt financing and/or payments under new or existing licensing or collaboration agreements. If sufficient funds on acceptable terms are not available when needed, the Company could be required to significantly reduce its operating expenses and delay, reduce the scope of, or eliminate one or more of its development programs.

2. Summary of Significant Accounting Policies

Basis of Presentation

The accompanying interim unaudited condensed consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information and on a basis consistent with the annual consolidated financial statements, and in the opinion of management, reflect all adjustments, which include only normal recurring adjustments, necessary for a fair statement of the periods presented. The December 31, 2013 Condensed Consolidated Balance Sheet was derived from the audited financial statements but does not include all disclosures required by GAAP. These interim financial results are not necessarily indicative of the results to be expected for the year ending December 31, 2014, or for any other future annual or interim period. The accompanying unaudited condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the related notes thereto included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the amounts and disclosures reported in the financial statements and accompanying notes. Actual results could differ materially from those estimates. The Company believes judgment is involved in determining the stock-based compensation and accruals. The Company evaluates estimates and assumptions as facts and circumstances dictate. As future events and their effects cannot be determined with precision, actual results could differ from these estimates and assumptions, and those differences could be material to the consolidated financial statements.

Concentration of Credit Risk

Cash, cash equivalents, and marketable securities consist of financial instruments that potentially subject the Company to a concentration of credit risk in the event of a default by the related financial institution holding the securities, to the extent of the value recorded in the balance sheet. The Company invests cash that is not required for immediate operating needs primarily in highly liquid instruments with lower credit risk. The Company has established guidelines relating to the quality, diversification, and maturities of securities to enable the Company to manage its credit risk.

Cash, Cash Equivalents, and Marketable Securities

The Company considers all highly liquid investments with an original maturity of 90 days or less at the time of purchase to be cash equivalents. Investments in securities with remaining maturities of less than one year, or where our intent is to use the investments to fund current operations or to make them available for current operations, are classified as short-term and available for sale. Investments in securities with remaining maturities greater than one year are classified as noncurrent and available for sale (see Note 3). Securities available for sale are carried at estimated fair value, with unrealized gains and losses reported as part of accumulated other comprehensive income (loss), a separate component of stockholders’ equity. The Company has estimated the fair value amounts by using available market information. The cost of available-for-sale securities sold is based on the specific-identification method.

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Research and Development Expenses

Development costs incurred in the research and development of new products are expensed as incurred, including expenses that may or may not be reimbursed under research and development collaboration agreements. Research and development costs include, but are not limited to, salaries, benefits, stock-based compensation, laboratory supplies, allocated overhead, fees for professional service providers and costs associated with product development efforts, including preclinical studies and clinical trials. Research and development expenses under collaborative agreements approximate or exceed the revenue recognized under such agreements.

The Company estimates preclinical study and clinical trial expenses based on the services performed, pursuant to contracts with research institutions and clinical research organizations that conduct and manage preclinical studies and clinical trials on its behalf. In accruing service fees, the Company estimates the time period over which services will be performed and the level of effort to be expended in each period. If the actual timing of the performance of services or the level of effort varies from the estimate, the Company will adjust the accrual accordingly. Payments made to third parties under these arrangements in advance of the receipt of the related services are recorded as prepaid expenses until the services are rendered.

Stock-Based Compensation Expense

The Company measures employee and director stock-based compensation expense for stock awards at the grant date, based on the fair value-based measurement of the award, and the expense is recorded over the related service period, generally the vesting period, net of estimated forfeitures. The Company calculates the fair value-based measurement of stock options using the Black-Scholes valuation model and the single- option method and recognizes expense using the straight-line attribution approach.

The Company accounts for equity instruments issued to nonemployees based on their fair values on the measurement dates using the Black-Scholes option-pricing model. The fair values of the options granted to nonemployees are remeasured as they vest. As a result, the noncash charge to operations for nonemployee options with vesting is affected each reporting period by changes in the fair value of the Company’s common stock.

Comprehensive Loss

Comprehensive loss represents net loss adjusted for the change during the periods presented in unrealized gains and losses on available-for-sale securities less reclassification adjustments for realized gains or losses included in net loss. The unrealized gains or losses are reported on the Consolidated Statements of Comprehensive Loss.

Net Loss Per Common Share

Basic net loss per common share is calculated by dividing the net loss by the weighted-average number of common shares outstanding during the period, without consideration of common stock equivalents. Diluted net loss per common share is computed by dividing the net loss by the weighted-average number of common shares and common share equivalents outstanding for the period. Common stock equivalents are only included in the calculation of diluted net loss per common share when their effect is dilutive.

The Company’s potential dilutive securities which include unvested restricted stock, stock options, and warrants have been excluded from the computation of diluted net loss per share as the effect would be to reduce the net loss per share and be antidilutive. Therefore, the denominator used to calculate both basic and diluted net loss per common share is the same in all periods presented.

The following shares of outstanding potentially dilutive securities have been excluded from the computations of diluted net loss per common share as the effect of including such securities would be antidilutive:

	As of March 31,
	2014	2013
Warrants to purchase common stock	88,545	38,997
Options to purchase common stock	2,548,314	1,050,061
	2,636,859	1,089,058

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3. Investments

At March 31, 2014, the amortized cost and fair value of investments, with gross unrealized gains and losses, were as follows:

(in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Money market funds	$	33,137	$	—	$	—		$	33,137
Commercial paper	10,238		9		—			10,247
Corporate debt securities	20,757		—		(10		)	20,747
Total investments	$	64,132	$	9	$	(10	)	$	64,131

Reported as:
Cash and cash equivalents								$	32,739
Marketable securities, current								29,302
Restricted cash								398
Marketable securities, non-current								1,692
Total investments								$	64,131

At December 31, 2013, the amortized cost and fair value of investments, with gross unrealized gains, were as follows:

(in thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value
Money market funds	$	53,511	$	—	$	—	$	53,511
Federal agency securities	12,301		—		—		12,301
Commercial paper	8,246		3		—		8,249
Corporate debt securities	1,961		—		—		1,961
Total investments	$	76,019	$	3	$	—	$	76,022

Reported as:
Cash and cash equivalents							$	53,306
Marketable securities							22,511
Restricted cash							205
Total investments							$	76,022

There were no realized gains or losses from the sale of marketable securities for the three months ended March 31, 2014 and 2013.

4. Fair Value of Financial Instruments

Cash, accounts payable and accrued liabilities are carried at cost, which approximates fair value given their short-term nature. Marketable securities and cash equivalents are carried at fair value.

The fair value of financial instruments reflects the amounts that would be received upon the sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date (exit price). The fair value hierarchy is based on three levels of inputs that may be used to measure fair value, of which the first two are considered observable, and the third is considered unobservable, as follows:

Level 1 — Quoted prices in active markets for identical assets or liabilities.

Level 2 — Inputs other than those included in Level 1 that are directly or indirectly observable, such as quoted prices for similar assets or liabilities in active markets; quoted prices for identical or similar assets or liabilities in markets that are not active; or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

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Level 3 — Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The Company measures the fair value of financial assets and liabilities using the highest level of inputs that are reasonably available as of the measurement date. The following tables summarize the fair value of financial assets and liabilities (investments) that are measured at fair value and the classification by level of input within the fair value hierarchy:

	Fair Value Measurements as of
	March 31, 2014
(in thousands)	Level 1		Level 2		Level 3		Total
Investments:
Money market funds	$	33,137	$	—	$	—	$	33,137
Commercial paper	—		10,247		—		10,247
Corporate debt securities	—		20,747		—		20,747
Total investments	$	33,137	$	30,994	$	—	$	64,131

	Fair Value Measurements as of
	December 31, 2013
(in thousands)	Level 1		Level 2		Level 3		Total
Investments:
Money market funds	$	53,511	$	—	$	—	$	53,511
Federal agency securities	—		12,301		—		12,301
Commercial paper	—		8,249		—		8,249
Corporate debt securities	—		1,961		—		1,961
Total investments	$	53,511	$	22,511	$	—	$	76,022

The Company’s Level 2 investments include U.S. government-backed securities that are valued based upon observable inputs that may include benchmark yields, reported trades, broker/dealer quotes, issuer spreads, two-sided markets, benchmark securities, bids, offers and reference data including market research publications. The average remaining maturity of the Company’s Level 2 investments as of March 31, 2014 is less than ten months and all of these investments are rated by S&P and Moody’s at AAA or AA+.

The estimated fair value of the notes payable as of March 31, 2014, as measured using Level 3 inputs, approximates the carrying amount as presented on the condensed consolidated balance sheet.

5. Notes Payable

Loan and Security Agreement

In September 2012, the Company entered into the Agreement with MidCap Financial, providing for the borrowing of up to $15 million, of which $10 million was required to be drawn. The remaining $5 million was available to be drawn at the option of the Company. The Agreement provides for the loan to be issued in three tranches: the first tranche of $5 million was issued in September 2012; the second tranche of $5 million was issued in December 2012; and, prior to the amendment described below, the final tranche could have been drawn at the option of the Company no later than June 2013. The loan has a monthly variable interest rate, reset each month, if applicable, as determined by adding to 600 basis points the greater of: (a) one month LIBOR or (b) 3% (the LIBOR floor). Interest on amounts outstanding are payable monthly in arrears. There is an interest only period to December 31, 2013 followed by straight-line principal payments over thirty-six months until December 31, 2016. At the time of final payment, the Company must pay an exit fee of 3% of the drawn amount. Pursuant to the Agreement, the Company provided a first priority security interest in all existing and after-acquired assets, excluding intellectual property. In addition, the terms of the Agreement provided MidCap Financial a warrant to purchase shares of the Company’s Series E convertible preferred stock (Series E Preferred) equal to 4% of the amount drawn down under the facility divided by the Series E Preferred exercise price of $12.11 per share. The warrant expired upon the completion of the Company’s IPO.

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The Company has the right to prepay all or a portion of the borrowed amounts under the Agreement; however, if the Company exercises this option, the Company must pay a prepayment fee determined by multiplying the outstanding loan amount by 5% if the prepayment occurs on or before December 31, 2014, 2% if the prepayment occurs in 2015 and 1% if the prepayment occurs in the final year. In the event of default, upon which all amounts borrowed become immediately due and payable, the Company will be subject to the prepayment fee. An event of default includes, but is not limited to, an occurrence such as a payment default, a material adverse change, insolvency, or a change of control.

In June 2013, the Company entered into the Amendment to extend the draw down date for the final tranche of $5.0 million from June 2013 to May 2014. In addition, the final tranche was changed from an optional draw down to a required draw down. In connection with the Amendment, the Company issued a warrant to purchase up to 49,548 shares of the Company’s common stock with an exercise price of $12.11 per share. The warrant expires on the tenth anniversary of its issuance date. The warrants issued to Midcap Financial had an initial fair value of $130,000, which represent financing fees, and are included in other assets in the accompanying consolidated balance sheet and are being amortized as non-cash interest expense over the remaining term of the Agreement using the effective interest method. The Company estimated the fair values of these warrants using the Black-Scholes option-pricing model, based on the inputs for the estimated fair value of the underlying common stock at the valuation measurement date, the contractual term of the warrant, risk-free interest rates, expected dividend rates and expected volatility of the price of the underlying common stock.

Future payments as of March 31, 2014 under the Agreement, assuming no adjustments to the variable rate of interest of 9% as of March 31, 2014, are as follows:

(in thousands)
Remainder of 2014	$	2,990
2015	3,724
2016	3,701
Total minimum payments	10,415
Less amount representing interest	(1,226		)
Notes payable, gross	9,189
Discount on notes payable	(98		)
Accretion of the final exit fee payment	102
Carrying value of notes payable	$	9,193

6. Sanofi

In January 2010, the Company and Sanofi entered into an agreement for the development and commercialization of KB001, the precursor to KB001-A, an investigational new biologic for the treatment and prevention of Pseudomonas aeruginosa (Pa) infections (the Sanofi agreement). Under the terms of the Sanofi agreement, the Company received an initial upfront non-refundable payment of $35 million and received an additional non-refundable payment of $5 million that represented a second installment of the upfront fees due to the Company under the agreement upon completion of a sublicense negotiation with a third party in August 2011. The Company may also receive development, regulatory and commercial contingent payments for a potential further $250 million, as well as royalties on eventual product sales, if any. These contingent payments do not meet the definition of milestones since they are based solely on Sanofi’s performance and therefore, the milestone method will not be applied to these payments. Sanofi is solely responsible for conducting, at its cost, the research, development, manufacture, and commercialization of the licensed products for the diagnosis, treatment and/or prevention of all human diseases and conditions caused by Pa, except that the Company retains responsibility, at the Company’s cost, for developing and promoting the products for the diagnosis, treatment and/or prevention of Pa in patients with cystic fibrosis (CF) or bronchiectasis. Sanofi has an option to obtain rights to participate in the development and promotion of KB001-A and other licensed products for the diagnosis, treatment and/or prevention of Pa in patients with CF or bronchiectasis, either outside of the U.S. or worldwide, at any time up to 90 days after the delivery by the Company to Sanofi of the final clinical study report from the Company’s Phase 2 clinical trial of KB001-A in Pa-infected patients with CF.

The agreement will remain in effect until all payment obligations under the agreement end. Sanofi may terminate the agreement for convenience or technical failure, and either Sanofi or the Company may terminate the agreement for material breach of the agreement or technical failure by the other party. In the event Sanofi terminates the agreement for convenience or the Company terminates due to Sanofi’s material breach, worldwide rights to develop, manufacture and commercialize licensed products would revert back to the Company, and Sanofi would grant to the Company a license to allow it to develop,

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manufacture, and commercialize licensed products worldwide, subject to commercially reasonable financial terms to be negotiated by the parties after such termination. In the event that the Company materially breaches the agreement, Sanofi may terminate the agreement or, rather than terminate the agreement, opt to deduct any damages awarded for the Company’s breach against future contingent payments and royalties otherwise payable by Sanofi under the agreement.

Under the terms of the Sanofi agreement, the Company may receive specified research and development funding for services performed in connection with KB001-A research and development efforts. Reimbursements received by the Company for these services are recorded as contract revenue when earned as the related services are provided.

7. Commitments and Contingencies

Contractual Obligations and Commitments

On May 21, 2013, the Company entered into an agreement with a third party for the manufacturing of KB003 clinical supply for future clinical trials. Despite the termination of the KB003 development program in severe asthma during the first quarter of 2014, we are continuing to evaluate other potential indications for KB003. Under that agreement the third party will perform a range of related services, including process development, optimization, validation, formulation development, regulatory assistance, stability testing and related activities. The agreement will remain in effect until services are completed or until either party terminates in accordance with the agreement. Supplies of material shall be according to FDA’s current Good Manufacturing Practice (cGMP) when required. As of March 31, 2014, there was a remaining commitment for services of approximately $2.9 million with the third party which is currently expected to be incurred through 2015.

Aside from the updated contractual commitment disclosed above, as of March 31, 2014, there were no significant and material changes to our contractual obligations from those set forth in our Annual Report on Form 10-K (File No. 001-35798), filed with the Securities and Exchange Commission (SEC) on March 13, 2014.

Guarantees and Indemnifications

The Company, as permitted under Delaware law and in accordance with its bylaws, has agreed to indemnify its officers and directors for certain events or occurrences, subject to certain limits, while the officer or director is or was serving at the Company’s request in such capacity. The term of the indemnification period is equal to the officer’s or director’s lifetime. The maximum amount of potential future indemnification is unlimited; however, the Company currently holds director and officer liability insurance. This insurance limits the Company’s exposure and may enable it to recover a portion of any future amounts paid.

The Company has certain agreements with service providers with which it does business that contain indemnification provisions pursuant to which the Company typically agrees to indemnify the party against certain types of third-party claims. The Company accrues for known indemnification issues when a loss is probable and can be reasonably estimated. The Company would also accrue for estimated incurred but unidentified indemnification issues based on historical activity. As the Company has not incurred any indemnification losses to date, there were no accruals for or expenses related to indemnification issues for any period presented.

8. Warrants to Purchase Common Stock

On June 19, 2013, in connection with the Amendment to its debt agreement with MidCap Financial, the Company issued a warrant to purchase up to 49,548 shares of the Company’s common stock with an exercise price of $12.11 per share. The warrant expires in June 2023. The Company recorded the initial value of the warrants in equity and other assets in the accompanying consolidated balance sheet, with the deferred other asset to be amortized over the remaining term of the debt using the effective interest method.

In addition, the Company has outstanding warrants to purchase an aggregate of 38,997 shares of common stock at $5.13 per share which will expire on October 31, 2015.

9. Stockholders’ Equity

2012 Equity Incentive Plan

As of March 31, 2014, under the 2012 Equity Incentive Plan, the Company may grant shares, stock units, stock appreciation rights, performance cash awards and/or options to employees, directors, consultants, and other service providers. For options, the per share exercise price may not be less than the fair market value of a Company common share on the date of grant. Awards generally vest over four years and expire 10 years from the date of grant. Options generally become exercisable as they vest following the date of grant.

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A summary of stock option activity for the three months ended March 31, 2014 under all of the Company’s options plans is as follows:

(in thousands)	Options		Weighted Average Exercise Price
Outstanding at December 31, 2013	1,820,784		$	4.46
Granted	876,500		5.37
Exercised	(50,304	)	1.18
Cancelled	(98,666	)	6.35
Outstanding at March 31, 2014	2,548,314		$	4.77

Weighted-average fair value of options granted during the period			$	3.45

Stock-Based Compensation

The Company recorded stock-based compensation expense in the condensed consolidated statements of comprehensive loss as follows:

	Three Months
	Ended March 31,
(in thousands)	2014		2013
General and administrative	$	226	$	85
Research and development	265		96
	$	491	$	181

At March 31, 2014, the Company had $4.7 million of total unrecognized compensation expense, net of estimated forfeitures, related to outstanding stock options that will be recognized over a weighted-average period of 3.2 years.

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations. Forward-Looking Statements

The following discussion and analysis should be read in conjunction with our financial statements and accompanying notes included in this Quarterly Report on Form 10-Q and the financial statements and accompanying notes thereto and Management’s Discussion and Analysis of Financial Condition and Results of Operations included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2013, filed with the Securities and Exchange Commission, or SEC, on March 13, 2014. This discussion contains “forward-looking statements” within the meaning of Section 27A of the Securities Act and Section 21E of the Exchange Act. Such forward looking statements involve risks and uncertainties. We use words such as “may,” “will,” “expect,” “anticipate,” “estimate,” “intend,” “plan,” “predict,” “potential,” “believe,” “should” and similar expressions to identify forward-looking statements. Although we believe the expectations reflected in these forward- looking statements are reasonable, such statements are inherently subject to risk and we can give no assurances that our expectations will prove to be correct. These statements appearing throughout this Quarterly Report on Form 10-Q are statements regarding our intent, belief, or current expectations, primarily regarding our operations. You should not place undue reliance on these forward-looking statements, which apply only as of the date of this Quarterly Report on Form 10-Q. As a result of many factors, such as those set forth under “Risk Factors” under Item 1A of Part II below, and elsewhere in this Quarterly Report on Form 10-Q, our actual results may differ materially from those anticipated in these forward-looking statements. We undertake no obligation to update these forward-looking statements to reflect events or circumstances after the date of this report or to reflect actual outcomes.

Overview

We are a biopharmaceutical company focused on monoclonal antibody therapeutics for diseases that are a significant burden to society and patients and their families. We have a portfolio of patient- targeted, first-in-class antibodies using our Humaneered® antibody technology to treat serious medical conditions with a primary clinical focus on respiratory diseases and cancer. Our principal pharmaceutical product candidates that we have advanced to the clinical development stage are:

· KB001-A, a Humaneered®, PEGylated, anti-PcrV modified antibody fragment (Fab’) antibody that is being developed for the prevention and treatment of Pseudomonas aeruginosa (Pa) infections in mechanically ventilated patients and cystic fibrosis(CF) patients with chronic Pa lung infections;

· KB004, a Humaneered® anti-EphA3 monoclonal antibody that has the potential to offer a novel approach to treating both hematologic malignancies and solid tumors; and

· KB003, a Humaneered® anti-granulocyte macrophage colony-stimulating factor (anti-GM-CSF) monoclonal antibody that was being developed for the treatment of severe asthma inadequately controlled by corticosteroids. We have discontinued the development of this antibody in severe asthma.

In January 2010, we entered into an agreement with Sanofi pursuant to which we granted Sanofi an exclusive worldwide license to develop, manufacture, and commercialize antibodies directed against the PcrV protein of Pa (including KB001-A) for all indications, and Sanofi is solely responsible for research, development, manufacturing, and commercialization. As part of this agreement, we retained the right to develop and promote KB001-A for Pa in CF or bronchiectasis patients. Sanofi is focusing its clinical development on prevention of Pa VAP. Pursuant to the agreement, we received an initial upfront payment of $35 million and an additional $5 million payment in August 2011 that were recognized as revenue through June 30, 2012. We have the potential to receive additional contingent payments aggregating up to $250 million upon achievement by Sanofi of certain clinical, regulatory and commercial events, together with tiered royalties based upon global net sales of licensed products. However, there can be no assurances that Sanofi will continue to further develop KB001-A or achieve the events that will trigger the contingent payments. As a result, we may not recognize any additional revenue from this agreement. We are conducting a Phase 2 clinical trial in CF patients with chronic Pa infections. As part of Sanofi’s clinical development plan for Pa ventilator associated pneumonia (VAP), Sanofi has conducted a Phase 1 clinical safety study in healthy volunteers to evaluate higher doses than those that we previously tested. That study was successfully completed, dosing patients at levels up to 30 mg/kg with no safety issues noted. Sanofi has further indicated that they have completed their manufacturing process development and are preparing for GMP manufacturing runs to provide material for a Phase 2b intravenous study to begin as early as mid-year 2015 to determine the safety and efficacy of KB001-A in preventing VAP. Based on the results of this clinical trial, Sanofi plans to conduct a subsequent Phase 3 study. We also understand that the Phase 2b and Phase 3 trials are being designed as pivotal studies and are intended to serve as a basis for registration of KB001-A for the prevention of Pa VAP.

As part of our agreement with Sanofi, we have retained responsibility for developing and promoting the product for the diagnosis, treatment, and/or prevention of Pa in patients with CF or bronchiectasis. Subject to the terms of the agreement, Sanofi has an option to assume primary responsibility for developing and promoting KB001-A for Pa infection in CF or bronchiectasis patients upon the completion of our Phase 2 clinical trial. If Sanofi exercises its option to acquire ex-US or global rights to our CF program, we currently estimate that the payments to us would be in the range of $40 million to $70 million based on estimated development costs during the term of the agreement.

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We have an ongoing 180-patient, randomized, double-blind, placebo-controlled monthly-dosed, intravenous Phase 2 clinical trial of KB001-A in CF patients with chronic Pa infections. We also have an ongoing Phase 1 dose escalation study of KB004 in subjects with hematologic cancer and entered the Phase 2 expansion portion of the clinical testing of KB004 in AML and MDS patients in February 2014. Finally, we completed our 160-patient, randomized, double-blind, placebo-controlled, monthly-dose, intravenous Phase 2 clinical trial of KB003 in patients with severe asthma inadequately controlled by corticosteroids in February 2014. We have discontinued development of KB003 in severe asthma, and we are evaluating other potential indications for this antibody.

We believe our available capital, including the net proceeds from our stock offerings, and our borrowing capacity pursuant to the loan and security agreement we entered into with MidCap will be sufficient to sustain operations for at least the next 12 months. We will need to raise additional capital in order to further advance our product candidates towards regulatory approval.

We licensed our proprietary Humaneered® antibody technology to Novartis in 2007 on a non-exclusive basis and received a license fee of $30 million at that time. We are not currently actively pursuing the license of our Humaneered® technology to third parties and we are not expecting to receive future revenue from additional licenses to this technology.

From the date we commenced our operations through 2006, our efforts focused primarily on research, development, and the advancement of our Humaneered® antibody technology. In 2006, we commenced our first clinical trial. We have incurred significant losses to date and, as of March 31, 2014, we had an accumulated deficit of $150.6 million. We have funded our operations primarily through private and public placements of our equity securities, contract revenue in connection with our collaborations, and grants and borrowings under equipment financing arrangements and our loan and security agreement. On February 5, 2013, we closed our initial public offering (IPO) of 8,750,000 shares of common stock at an offering price of $8.00 per share, resulting in net proceeds of approximately $61.5 million, after deducting underwriting discounts, commissions and offering expenses. On October 1, 2013 we closed a public offering of 8,625,000 shares of common stock at an offering price of $4.00 per share, resulting in net proceeds of approximately $32.0 million, after deducting underwriting discounts, commissions and offering expenses. As of March 31, 2014, we had cash, cash equivalents, and investments of $64.4 million. We expect to continue to incur net losses as we develop our drug candidates, expand clinical trials for our drug candidates currently in clinical development, expand our research and development activities, expand our systems and facilities, seek regulatory approvals, and engage in commercialization preparation activities in anticipation of Food and Drug Administration (FDA) approval of our drug candidates. Specifically, we have incurred substantial expenses in connection with our Phase 2 clinical trial for KB003 in severe asthma patients inadequately controlled by corticosteroids. In addition, we have incurred and we expect to continue to incur substantial expenses for our Phase 2 clinical trial of KB001-A in CF patients with chronic Pa infections and our Phase 1 and Phase 2 clinical trials for our KB004 oncology program. Significant capital is required to continue to develop and to launch a product and many expenses are incurred before revenue is received, if any. We are unable to predict the extent of any future losses or when we will receive revenue or become profitable, if at all.

Critical Accounting Policies and Use of Estimates

Our management’s discussion and analysis of our financial condition and results of operations is based on our consolidated financial statements, which have been prepared in accordance with accounting principles generally accepted in the United States (GAAP). The preparation of our financial statements in conformity with GAAP requires our management to make estimates and assumptions that affect the amounts and disclosures reported in the financial statements and accompanying notes. Actual results could differ materially from those estimates. Our management believes judgment is involved in determining revenue recognition, the fair value-based measurement of stock-based compensation, accruals and warrant valuations. Our management evaluates estimates and assumptions as facts and circumstances dictate. As future events and their effects cannot be determined with precision, actual results could differ from these estimates and assumptions, and those differences could be material to the consolidated financial statements. If our assumptions change, we may need to revise our estimates, or take other corrective actions, either of which may also have a material adverse effect on our statements of operations, liquidity and financial condition.

We are an emerging growth company under the JOBS Act. Emerging growth companies can delay adopting new or revised accounting standards until such time as those standards apply to private companies. We have elected to avail ourselves of this exemption from new or revised accounting standards and, therefore, we may not be subject to the same new or revised accounting standards as other public companies that are not emerging growth companies.

There have been no significant and material changes in our critical accounting policies and use of estimates during the three months ended March 31, 2014, as compared to those disclosed in “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Critical Accounting Policies and Use of Estimates” in our 2013 Annual Report on Form 10-K (File No. 001-35798), filed with the Securities and Exchange Commission (SEC) on March 13, 2014.

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Results of Operations

General

We have not generated net income from operations, except for the year ended December 31, 2007 during which we recognized a one-time license payment from Novartis. At March 31, 2014, we had an accumulated deficit of $150.6 million primarily as a result of research and development and general and administrative expenses. While we may in the future generate revenue from a variety of sources, including license fees, milestone payments, and research and development payments in connection with strategic partnerships, our product candidates are at an early stage of development and may never be successfully developed or commercialized. Accordingly, we expect to continue to incur substantial losses from operations for the foreseeable future, and there can be no assurance that we will ever generate significant revenue or profits.

Contract Revenue

Our recent revenue is comprised primarily of collaboration agreement-related revenue. Collaboration agreement-related revenue includes license fees, payments for research and development services, and milestone and other contingent payments.

Research and Development Expenses

Conducting research and development is central to our business model. We expense both internal and external research and development costs as incurred. We currently track external research and development costs incurred by project for each of our clinical programs (KB001-A, KB003, and KB004). We have not tracked our external costs by project since inception. We began tracking our external costs by project beginning January 1, 2008, and we have continued to refine our systems and our methodology in tracking external research and development costs. Our external research and development costs consist primarily of:

· expenses incurred under agreements with contract research organizations, investigative sites, and consultants that conduct our clinical trials and a substantial portion of our preclinical activities;

· the cost of acquiring and manufacturing clinical trial and other materials; and

· other costs associated with development activities, including additional studies.

Other research and development costs consist primarily of internal research and development costs such as salaries and related fringe benefit costs for our employees (such as workers compensation and health insurance premiums), stock-based compensation charges, travel costs, lab supplies, overhead expenses such as rent and utilities, and external costs not allocated to one of our clinical programs. Internal research and development costs generally benefit multiple projects and are not separately tracked per project. The following table shows our total research and development expenses for the three months ended March 31, 2014 and 2013, and for the period from January 1, 2008 to March 31, 2014.

	Three
	Months Ended				For the Period from
	March 31,				January 1, 2008 to
(in thousands)	2014		2013		March 31, 2014

External costs by Program:
KB001-A	$	1,578	$	1,149	$	27,058
KB003	1,606		2,457		37,420
KB004	2,039		1,135		27,941
Other research and & development costs	2,467		1,579		57,157
Total research and development	$	7,690	$	6,320	$	149,576

We expect to continue to incur substantial expenses related to our development activities for the foreseeable future as we continue product development including continuing our Phase 2 clinical trial for our KB001-A CF program, and our Phase 1/ Phase 2 clinical trial for our KB004 oncology program, as well as concluding our Phase 2 clinical trial for our KB003 severe asthma program completed in February 2014. As product candidates in later stages of clinical development generally have higher development costs than those in earlier stages of clinical development, primarily due to the increased size and duration of later stage clinical trials, we expect that our research and development expenses will increase in the future. In addition, if our product development efforts are successful, we expect to incur substantial costs to prepare for potential clinical trials and activities beyond the Phase 2 trial for KB001-A, and the ongoing Phase 1/Phase 2 trial for KB004.

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General and Administrative Expenses

General and administrative expenses consist principally of personnel-related costs, professional fees for legal, consulting, audit and tax services, rent and other general operating expenses not otherwise included in research and development. We anticipate general and administrative expenses will increase in future periods, reflecting an expanding infrastructure and increased professional fees associated with being a public reporting company.

Comparison of Three Months Ended March 31, 2014 and 2013


	Three Months Ended March 31,						Increase/			Percent
(in thousands)	2014			2013			(Decrease)			Change
Contract revenue	$	—		$	16		$	(16	)	(100	)%
Operating expenses:
Research and development	7,690			6,320			1,370			22	%
General and administrative	2,470			2,019			451			22	%
Loss from operations	(10,160		)	(8,323		)	(1,837		)	(22	)%
Interest expense	(260		)	(263		)	3			1	%
Interest and other income, net	12			12			—			0	%
Net loss	$	(10,408	)	$	(8,574	)	$	(1,834	)	(21	)%

Contract revenue in each period related solely to our arrangement with Sanofi in which we licensed the KB001-A program to Sanofi in 2010. Contract revenue decreased from $16,000 for the three months ended March 31, 2013 to zero for the three months ended March 31, 2014. This decrease was mainly attributable to the completion of our substantive performance obligations under our agreement with Sanofi in mid 2012. We expect future contract revenue from Sanofi to remain at a minimal level in future periods unless we receive contingent payments or royalties under our agreement.

Research and development expenses increased $1.4 million, from $6.3 million for the three months ended March 31, 2013 to $7.7 million for the three months ended March 31, 2014. The increase was primarily attributed to a $0.9 million increase in costs, including milestone payments for our KB004 clinical program for hematological malignancies, $0.9 million in increased employee, consulting and overhead expenses and a $0.4 million increase in spending for our KB001-A CF program. These increases were partially offset by a decrease of $0.9 million in spending for clinical trial expenses for our KB003 severe asthma program.

In addition to the ongoing enrollment work for our Phase 2 clinical trial for KB001-A in CF patients with chronic Pa infections, we have now commenced enrollment in the Phase 2 expansion portion of our clinical trial for KB004 in hematologic malignancies. We also incurred significant costs in the first quarter of 2014 on our Phase 2 clinical trial of KB003 in severe asthma and expect we will continue to incur costs in 2014 on that program as we complete the follow up activities, resolve manufacturing commitments and work through other close-out related activities. As a result, we expect a modest overall increase in research and development expenses in 2014 as compared to 2013.

General and administrative expenses increased $0.5 million, from $2.0 million for the three months ended March 31, 2013 to $2.5 million for the three months ended March 31, 2014 due primarily to increases of $0.4 million in employee-related expenses and $0.1 million in office expenses. We expect a modest increase in general and administrative expenses in 2014 as compared to 2013, driven primarily by increases in facilities and employee-related costs.

Interest expense of $0.3 million recognized for the three months ended March 31, 2013 and March 31, 2012, was related to our loan and security agreement with MidCap Financial entered into in September 2012 and amended in 2013

Interest and other income, net primarily consists of interest earned on our cash and cash equivalents, foreign currency gains and losses and realized gains and losses on the sale of investments.

Liquidity and Capital Resources

Since our inception, we have financed our operations primarily through proceeds from our initial and secondary public equity offerings, private placements of our equity securities, debt financing, interest income earned on cash, and cash equivalents, and marketable securities, borrowings against lines of credit, and payments under agreements with Sanofi and Novartis. At March 31, 2014, we had cash and cash equivalents and investments of $64.4 million.

We expect to incur substantial expenditures in the foreseeable future for the development and potential commercialization of our product candidates. Specifically, we have incurred and we expect to continue to incur substantial expenses in connection with our Phase 2 clinical trial for KB001-A in CF patients with chronic Pa infections, and for our ongoing Phase 1/Phase 2 clinical trials for our KB004 development program in hematologic malignancies.

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We believe our available capital, including the net proceeds from our recent public offerings and our borrowing capacity pursuant to the loan and security agreement we entered into with MidCap Financial in September 2012 and amended in June 2013, will be sufficient to sustain operations for at least the next 12 months. If the KB001-A or KB004 Phase 2 clinical trials are successful, we will need to raise additional capital in order to further advance our product candidates towards regulatory approval.

We will continue to require additional financing to develop our products and fund operations. We will seek funds through equity or debt financings, collaborative or other arrangements with corporate partners, or through other sources of financing. Adequate additional funding may not be available to us on acceptable terms or at all. Our failure to raise capital as and when needed would have a negative impact on our financial condition and our ability to pursue our business strategies. We anticipate that we will need to raise substantial additional capital, the requirements of which will depend on many factors, including:

· the type, number, costs, and results of the product candidate development programs which we are pursuing or may choose to pursue in the future;

· the scope, progress, expansion, costs, and results of our clinical trials;

· the timing of and costs involved in obtaining regulatory approvals;

· our ability to establish and maintain development partnering arrangements;

· the timing, receipt and amount of contingent, royalty, and other payments from Sanofi or any of our future development partners;

· the emergence of competing products or technologies and other adverse market developments;

· the costs of maintaining, expanding, and protecting our intellectual property portfolio, including potential litigation costs and liabilities;

· the resources we devote to marketing, and, if approved, commercializing our product candidates;

· the scope, progress, expansion, and costs of manufacturing our product candidates;

· our ability to draw funds from our current or any future loan and security agreement; and

· the costs associated with being a public company.

If we are unable to raise additional funds when needed, we may be required to delay, reduce, or terminate some or all of our development programs and clinical trials. We may also be required to sell or license to others technologies or clinical product candidates or programs that we would prefer to develop and commercialize ourselves.

The following table sets forth the primary sources and uses of cash and cash equivalents for each of the periods presented below:

	Three Months
	Ended March 31,
(in thousands)	2014			2013
Net cash (used in) provided by:
Operating activities	$	(11,298	)	$	(7,801	)
Investing activities	(8,773		)	2,390
Financing activities	(752		)	64,413
Net increase (decrease) in cash and cash equivalents	$	(20,823	)	$	59,002

Net cash used in operating activities was $11.3 million and $7.8 million for the three months ended March 31, 2014 and 2013, respectively. The primary use of cash in each of the periods was to fund our operations related to the development of our product candidates. Cash used in operating activities of $11.3 million for the three months ended March 31, 2014 primarily related to our net loss of $10.4 million, adjusted for non-cash items such as $0.5 million of stock-based compensation expense and net cash outflows of $1.6 million related to changes in operating assets and liabilities. Cash used in operating activities of $7.8 million for the three months ended March 31, 2013 primarily related to our net loss of $8.6 million, adjusted for non-cash items such as $0.2 million of stock-based compensation expense and net cash inflows of $0.5 million related to changes in operating assets and liabilities..

Net cash used in investing activities was $8.8 million for the three months ended March 31, 2014, primarily related to purchases of investments. Net cash provided by investing activities was $2.4 million for the three months ended March 31, 2013, primarily related to proceeds from maturities of investments, net of cash used for the purchase of investments.

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Net cash used in financing activities was $0.8 million for the three months ended March 31, 2014, and consisted primarily of debt payments on our borrowings. Net cash provided by financing activities was $64.4 million for the three months ended March 31, 2013, which consisted primarily of net proceeds from our IPO.

We expect to incur substantial expenditures in the foreseeable future for the research, development and potential commercialization of our product candidates. We will continue to require additional financing to develop our products and fund operating losses. We will seek funds through equity or debt financings, collaborative or other arrangements with corporate sources, or through other sources of financing. Adequate additional funding may not be available to us on acceptable terms or at all. Our failure to raise capital as and when needed could have a negative impact on our financial condition and our ability to pursue our business strategies. If adequate funds are not available to us, we may be required to delay, reduce, or eliminate research and development programs or enter into collaborative or other arrangements for technologies that we would otherwise seek to develop ourselves or on terms that are less attractive than they might otherwise be.

Contractual Obligations and Commitments

On May 21, 2013, we entered into an agreement with a third party for the manufacturing of KB003 clinical supply for future clinical trials. Despite the termination of the KB003 development program in severe asthma during the first quarter of 2014, we are continuing to evaluate other potential indications for KB003. Under that agreement the third party will perform a range of related services, including process development, optimization, validation, formulation development, regulatory assistance, stability testing and related activities. The agreement will remain in effect until services are completed or until either party terminates in accordance with the agreement. Supplies of material shall be according to FDA’s current Good Manufacturing Practice (cGMP) when required. As of March 31, 2014, we had a remaining commitment for services of approximately $2.9 million with the third party which is currently expected to be incurred through 2015.

Off-Balance Sheet Arrangements

We currently have no off-balance sheet arrangements, such as structured finance, special purpose entities or variable interest entities.

Item 3. Quantitative and Qualitative Disclosures About Market Risk.

We are exposed to market risk related to fluctuations in interest rates and market prices. Our primary exposure to market risk is interest rate sensitivity, which is affected by changes in the general level of U.S. interest rates. However, since a majority of our investments are in short-term FDIC-insured government securities, and money market funds, we do not believe we are subject to any material market risk exposure. The fair value of our investments included in cash equivalents and marketable securities was $63.7 million and $75.8 million as of March 31, 2014 and December 31, 2013, respectively.

We are also exposed to market risk related to fluctuations in interest rates indexed to LIBOR, which determines the variable interest payments made on our notes payable. However, we do not believe we are subject to any material market risk exposure.

Our investment policy is to limit credit exposure through diversification and investment in highly rated securities. We, along with our investment advisors, actively review current investment ratings, company specific events, and general economic conditions in managing our investments and in determining whether there is a significant decline in fair value that is other-than-temporary. We monitor and evaluate our investment portfolio on a quarterly basis for other-than-temporary impairment charges.

Item 4. Controls and Procedures.

Managements’ Evaluation of our Disclosure Controls and Procedures

Management, including our Chief Executive Officer and Chief Financial Officer, has evaluated the effectiveness of our disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)), as of the end of the period covered by this report. Based upon the evaluation, the Chief Executive Officer and Chief Financial Officer concluded that the disclosure controls and procedures were effective to ensure that information required to be disclosed in the reports we file and submit under the Securities Exchange Act of 1934, as amended, is (i) recorded, processed, summarized and reported as and when required and (ii) accumulated and communicated to our management, including the Chief Executive Officer and Chief Financial Officer, as appropriate to allow timely discussion regarding required disclosure.

Changes in Internal Control Over Financial Reporting

There have been no changes in our internal control over financial reporting during our most recent fiscal quarter 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

We are not currently a party to any material legal proceedings.

Item 1A. Risk Factors

Risk Related to Our Business and the Development, Regulatory Approval, and Commercialization of Our Product Candidates

We have a history of operating losses, we expect to continue to incur losses, and we may never become profitable.

As of March 31, 2014, we had an accumulated deficit of $150.6 million, and for the three months ended March 31, 2014, we incurred a net loss of $10.4 million. We have incurred net losses each year since our inception except for the year ended December 31, 2007. To date, we have only recognized revenue from payments for funded research and development and for license or collaboration fees. We expect to make substantial expenditures and incur additional operating losses in the future to further develop and commercialize our product candidates. Our accumulated deficit is expected to increase significantly as we expand our development and clinical trial efforts. Our ability to achieve and sustain profitability depends on obtaining regulatory approvals for and successfully commercializing our product candidates, either alone or with third parties. We do not currently have the required approvals to market any of our product candidates and we may never receive them. We may not be profitable even if we, Sanofi, or any of our future development partners succeed in commercializing any of our product candidates. Because of the numerous risks and uncertainties associated with developing and commercializing our product candidates, we are unable to predict the extent of any future losses or when we will become profitable, if at all.

We will need substantial additional capital to develop and commercialize our product candidates, and we may be unable to raise additional capital when needed, or at all, which would force us to reduce or discontinue operations.

As of March 31, 2014, we had $64.4 million in cash, cash equivalents, and investments. We utilized $11.3 million of cash in operating activities during the three months ended March 31, 2014. We expect our spending levels to increase in connection with our Phase 2 clinical trials for KB001-A and KB004, as well as other corporate activities.

Our spending levels vary based on new and ongoing development and corporate activities. As a result, our cash used in operating activities will also fluctuate from period to period. We have not sold and do not expect to sell any product candidates or derive royalty revenue from product candidate sales for the foreseeable future, if ever. In order to develop and bring product candidates through clinical trials, we must commit substantial resources to costly and time-consuming clinical trials. As such, we anticipate that we will need to raise substantial additional capital. In particular, in order to initiate an additional clinical trial for KB001A following receipt of our Phase 2 clinical results, we will need to raise additional capital. The amount of capital we will require and the timing of our need for additional capital will depend on many other factors, including:

· the type, number, costs, and results of the product candidate development programs which we are pursuing or may choose to pursue in the future;

· the scope, progress, expansion, costs, and results of, or delays in, our clinical trials;

· the timing of and costs involved in obtaining regulatory approvals;

· our ability to establish and maintain development partnering arrangements;

· the timing, receipt and amount of contingent, royalty, and other payments from Sanofi or any of our future development partners;

· the emergence of competing products or technologies and other adverse market developments;

· the costs of maintaining, expanding, and protecting our intellectual property portfolio, including potential litigation costs and liabilities;

· the resources we devote to marketing, and, if approved, commercializing our product candidates;

· the scope, progress, expansion, and costs of manufacturing our product candidates;

· our ability to draw funds from our present and any future loan and security agreement; and

· the costs associated with being a public company.

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Since our inception, we have been financing our operations primarily through private placements and our initial and secondary public offerings of our equity securities, interest income earned on cash, cash equivalents, and marketable securities, borrowings from lines of credit, and payments under agreements with Sanofi and Novartis International Pharmaceutical Ltd. (together with its affiliates, Novartis), a licensee of our Humaneered® technology. Our future capital requirements are substantial and in order to fund our future needs, we may seek additional funding through equity or debt financings, development partnering arrangements, borrowings from lines of credit, or other sources. We believe our cash on hand, together with the net proceeds received from our initial public offering and secondary offering, and our access to funds through our existing credit facility, will be sufficient to fund our operations for at least the next 12 months. Our expectations are based on management’s current assumptions and clinical development plans, which may prove to be wrong, and we could spend our available financial resources much faster than we currently expect. We will require substantial additional capital to support clinical trials, regulatory approvals, and, if approved, the commercialization of our product candidates. Additional funding may not be available to us on a timely basis or at acceptable terms, if at all.

If we are unable to raise additional funds when needed, we may be required to delay, reduce, or terminate some or all of our development programs and clinical trials. We may also be required to sell or license to others our technologies, product candidates, or development programs that we would have preferred to develop and commercialize ourselves on less than favorable terms, if at all.

Because we have a short operating history developing clinical-stage antibodies, there is a limited amount of information about us upon which you can evaluate our product candidates and business prospects.

We commenced our first clinical trial in 2006, and we have a limited operating history developing clinical-stage antibodies upon which you can evaluate our business and prospects. In addition, as an early-stage clinical development company, we have limited experience in conducting clinical trials, and we have never conducted clinical trials of a size required for regulatory approvals. Further, we have not yet demonstrated an ability to successfully overcome many of the risks and uncertainties frequently encountered by companies in new and rapidly evolving fields, particularly in the biopharmaceutical area. For example, to execute our business plan we will need to successfully:

· execute our product candidate development activities, including successfully completing our clinical trial programs;

· obtain required regulatory approvals for the development and commercialization of our product candidates;

· manage our spending as costs and expenses increase due to clinical trials, regulatory approvals, manufacturing and commercialization;

· secure substantial additional funding;

· develop and maintain successful strategic relationships;

· build and maintain a strong intellectual property portfolio;

· build and maintain appropriate clinical, sales, distribution, and marketing capabilities on our own or through third parties; and

· gain broad market acceptance and favorable reimbursement status for our product candidates.

If we are unsuccessful in accomplishing these objectives, we may not be able to develop product candidates, raise capital, expand our business, or continue our operations.

Our product candidates are at an early stage of development and may not be successfully developed or commercialized.

Our product candidates are in the early stage of development and will require substantial clinical development, testing, and regulatory approval prior to commercialization. We currently only have two product candidates in Phase 2 clinical trials, KB001-A and KB004, and we have recently discontinued development in severe asthma of KB003, our most advanced program at that time. None of our product candidates have advanced into a pivotal study and it may be years before such study is initiated, if at all. Of the large number of drugs in development, only a small percentage successfully complete the FDA regulatory approval process and are commercialized. Accordingly, even if we are able to obtain the requisite financing to continue to fund our development programs, we cannot assure you that our product candidates will be successfully developed or commercialized. If we, Sanofi, or any of our future development partners are unable to develop, or obtain regulatory approval for or, if approved, successfully commercialize, one or more of our product candidates, we may not be able to generate sufficient revenue to continue our business.

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Although we have decided to focus on the intravenous formulation of KB001-A for CF at this time rather than a subcutaneous formulation, we expect to resume development of a subcutaneous formulation at some point. There can be no assurance that either an intravenous or subcutaneous formulation will be successfully developed or, if it obtains regulatory approval, such formulation will be commercially viable.

We have and may continue to experience delays in commencing or conducting our clinical trials or in receiving data from third parties or in the completion of clinical testing, which could result in increased costs to us and delay our ability to generate product candidate revenue.

Before we can initiate clinical trials in the United States for our product candidates, we are required to submit the results of preclinical testing to the FDA as part of an Investigational New Drug (IND) application, along with other information including information about) product candidate chemistry, manufacturing, and controls and our proposed clinical trial protocol. We rely in part on preclinical, clinical, and quality data generated by Sanofi and other third parties for regulatory submissions for KB001-A. If Sanofi does not make timely regulatory submissions for KB001-A, it will delay our plans for our clinical trials for CF. If those third parties do not make this data available to us, we will likely have to develop all necessary preclinical and clinical data on our own, which will lead to significant delays and increase development costs of the product candidate. In addition, the FDA may require us to conduct additional preclinical testing for any product candidate before it allows us to initiate clinical testing under any IND, which may lead to additional delays and increase the costs of our preclinical development. Despite the presence of an active IND for a product candidate, clinical trials can be delayed for a variety of reasons including delays in:

· identifying, recruiting, and enrolling qualified subjects to participate in a clinical trial;

· identifying, recruiting, and training suitable clinical investigators;

· reaching agreement on acceptable terms with prospective contract research organizations (CROs) and trial sites, the terms of which can be subject to extensive negotiation, may be subject to modification from time to time, and may vary significantly among different CROs and trial sites;

· obtaining sufficient quantities of a product candidate for use in clinical trials, including as a result of transferring the manufacturing of a product candidate to another site or manufacturer;

· obtaining and maintaining institutional review board (IRB) or ethics committee approval to conduct a clinical trial at an existing or prospective site;

· retaining or replacing participants who have initiated a clinical trial but may withdraw due to adverse events from the therapy, insufficient efficacy, fatigue with the clinical trial process, or personal issues; and

· readiness of any companion diagnostic necessary to ensure that the study enrolls the target population. The FDA may also put a clinical trial on clinical hold at any time during product candidate development.

Once a clinical trial has begun, recruitment and enrollment of subjects may be slower than we anticipate. Numerous companies and institutions are conducting clinical studies in similar patient populations which can result in competition for qualified patients. In addition, clinical trials will take longer than we anticipate if we are required, or believe it is necessary, to enroll additional subjects. Clinical trials may also be delayed as a result of ambiguous or negative interim results. Further, a clinical trial may be suspended or terminated by us, an IRB, an ethics committee, or a data safety monitoring committee overseeing the clinical trial, any of our clinical trial sites with respect to that site or the FDA or other regulatory authorities due to a number of factors, including:

· failure to conduct the clinical trial in accordance with regulatory requirements or our clinical protocols;

· inspection of the clinical trial operations or clinical trial site by the FDA or other regulatory authorities;

· unforeseen safety issues, known safety issues that occur at a greater frequency or severity than we anticipate, or any determination that the clinical trial presents unacceptable health risks; or

· lack of adequate funding to continue the clinical trial.

Additionally, under the terms of our license and collaboration agreement with Sanofi, Sanofi has the exclusive right to develop and commercialize KB001, KB001-A and other antibodies directed against the PcrV protein or Pa for all indications. Although this agreement requires Sanofi to use commercially reasonable efforts to engage in certain product development activities, Sanofi may decide to amend, suspend or terminate the clinical trials or other activities related to these licensed product candidates. Further, if Sanofi or any of our future development partners do not develop the licensed product candidates in the time and manner that we expect, or at all, the clinical development efforts related to these licensed product candidates could be delayed or terminated. In addition, our ability to enforce our partners’ obligations under present or future collaboration efforts may be limited due to time and resource constraints, competing corporate priorities of our present or future partners, and other factors.

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Any delays in the commencement of our clinical trials, including any delays by Sanofi attributed to terminating or switching any subcontractors for the manufacture of the KB001-A drug substance, may delay or preclude our ability to further develop or pursue regulatory approval for our product candidates. Changes in U.S. and foreign regulatory requirements and guidance also may occur and we may need to amend clinical trial protocols to reflect these changes. Amendments may require us to resubmit our clinical trial protocols to IRBs for re-examination, which may affect the costs, timing, and likelihood of a successful completion of a clinical trial. If we, Sanofi, or any of our future development partners experience delays in the completion of, or if we, Sanofi, or any of our future development partners must terminate, any clinical trial of any product candidate our ability to obtain regulatory approval for that product candidate will be delayed and the commercial prospects, if any, for the product candidate may suffer as a result. In addition, many of these factors may also ultimately lead to the denial of regulatory approval of a product candidate.

Our product candidates are subject to extensive regulation, compliance with which is costly and time consuming, may cause unanticipated delays, or prevent the receipt of the required approvals to commercialize our product candidates.

The clinical development, approval, manufacturing, labeling, storage, record-keeping, advertising, promotion, import, export, marketing, and distribution of our product candidates are subject to extensive regulation by the FDA in the United States and by comparable authorities in foreign markets. In the United States, we are not permitted to market our product candidates until we receive regulatory approval from the FDA. The process of obtaining regulatory approval is expensive, often takes many years, and can vary substantially based upon the type, complexity, and novelty of the products involved, as well as the target indications. Approval policies or regulations may change and the FDA has substantial discretion in the drug approval process, including the ability to delay, limit, or deny approval of a product candidate for many reasons. Despite the time and expense invested in clinical development of product candidates, regulatory approval is never guaranteed.

The FDA or other comparable foreign regulatory authorities can delay, limit, or deny approval of a product candidate for many reasons, including:

· such authorities may disagree with the design or implementation of our, Sanofi’s, or any of our future development partners’ clinical trials;

· we, Sanofi, or any of our future development partners may be unable to demonstrate to the satisfaction of the FDA or other regulatory authorities that a product candidate is safe and effective for any indication;

· such authorities may not accept clinical data from trials which are conducted at clinical facilities or in countries where the standard of care is potentially different from the United States;

· the results of clinical trials may not demonstrate the safety or efficacy required by such authorities for approval;

· we, Sanofi, or any of our future development partners may be unable to demonstrate that a product candidate’s clinical and other benefits outweigh its safety risks;

· such authorities may disagree with our interpretation of data from preclinical studies or clinical trials or the use of results from antibody studies that served as precursors to our current drug candidates;

· such authorities may find deficiencies in the manufacturing processes or facilities of third-party manufacturers with which we, Sanofi, or any of our future development partners contract for clinical and commercial supplies;

· we may not be successful in developing any companion diagnostic necessary to demonstrate efficacy in our desired target populations for KB004;

· such authorities may delay approval or clearance of any companion diagnostic for KB004; or

· the approval policies or regulations of such authorities may significantly change in a manner rendering our, Sanofi’s, or any of our future development partners’ clinical data insufficient for approval.

With respect to foreign markets, approval procedures vary widely among countries and, in addition to the aforementioned risks, can involve additional product testing, administrative review periods, and agreements with pricing authorities. In addition, events raising questions about the safety of certain marketed pharmaceuticals may result in increased caution by the FDA and comparable foreign regulatory authorities in reviewing new drugs based on safety, efficacy or other regulatory considerations and may result in significant delays in obtaining regulatory approvals. Any delay in obtaining, or inability to obtain, applicable regulatory approvals would prevent us, Sanofi, or any of our future development partners from commercializing our product candidates.

The results of preclinical studies and early clinical trials are not always predictive of future results. Any product candidate we, Sanofi, or any of our future development partners advance into clinical trials may not have favorable results in later clinical trials, if any, or receive regulatory approval.

Drug development has substantial inherent risk. We, Sanofi, or any of our future development partners will be required to demonstrate through adequate and well-controlled clinical trials that our product candidates are effective, with a favorable benefit-risk profile, for use in their target indications before we can seek regulatory approvals for their commercial sale. Drug

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development is a long, expensive and uncertain process, and delay or failure can occur at any stage of development, including after commencement of any of our clinical trials. In addition, success in early clinical trials does not mean that later clinical trials will be successful because product candidates in later-stage clinical trials may fail to demonstrate sufficient safety or efficacy despite having progressed through initial clinical testing. Furthermore, our future trials will need to demonstrate sufficient safety and efficacy for approval by regulatory authorities in larger patient populations. Companies frequently suffer significant setbacks in advanced clinical trials, even after earlier clinical trials have shown promising results. In addition, only a small percentage of drugs under development result in the submission of a New Drug Application (NDA) or BLA to the FDA and even fewer are approved for commercialization.

For example, we recently announced the termination of development in severe asthma of KB003, our most advanced product candidate, because the Phase 2 study we were conducting did not meet its primary or secondary endpoints, despite promising results in prior studies of a precursor molecule, KB002.

Furthermore, the efficacy or safety data demonstrated with KB001, the precursor molecule to KB001-A, may not be reproduced in KB001-A.

Any product candidate we, Sanofi, or any of our future development partners advance into clinical trials may cause unacceptable adverse events or have other properties that may delay or prevent its regulatory approval or commercialization or limit its commercial potential.

Unacceptable adverse events caused by any of our product candidates that we advance into clinical trials could cause us or regulatory authorities to interrupt, delay, or halt clinical trials and could result in the denial of regulatory approval by the FDA or other regulatory authorities for any or all targeted indications and markets. This in turn could prevent us from completing development or commercializing the affected product candidate and generating revenue from its sale. For example, we observed fatal intracranial hemorrhages in two subjects deemed possibly related to the study drug by the study investigator in our KB004 Phase 1 clinical trial and, as a result, we amended our clinical protocol, which caused a delay in our program.

We and Sanofi have not yet completed testing of any of our product candidates for the treatment of the indications for which we intend to seek approval in humans, and we currently do not know the extent of adverse events, if any, that will be observed in individuals who receive any of our product candidates. If any of our product candidates cause unacceptable adverse events in clinical trials, we and Sanofi, as applicable, may not be able to obtain regulatory approval or commercialize such product candidate.

If we pursue development of a companion diagnostic intended to identify patients who are likely to benefit from KB004, failure to obtain approval for the diagnostic may prevent or delay approval of KB004.

We are in the initial phases of developing an in vitro EphA3 diagnostic, currently in the CLIA laboratory format, which is intended to identify patients who are likely to derive the most benefit from KB004. We have amended our study protocol prior to initiation of the Phase 2 expansion phase to include EphA3 positive status as an inclusion criterion.

The FDA regulates companion diagnostics such as the one we are developing as medical devices. FDA regulations pertaining to medical devices govern, among other things, the research, design, development, pre-clinical and clinical testing, manufacture, safety, efficacy, storage, record-keeping, packaging, labeling, adverse event reporting, advertising, promotion, marketing, distribution, and import and export of medical devices. Pursuant to the Federal Food, Drug, and Cosmetic Act (FDC Act), medical devices are subject to varying degrees of regulatory control and are classified in one of three classes depending on the controls the FDA determines necessary to reasonably ensure their safety and efficacy. In July 2011, the FDA issued a draft guidance that stated that if safe and effective use of a therapeutic depends on an in vitro diagnostic, then the FDA generally will not approve the therapeutic product until it is ready to approve or clear the in vitro companion diagnostic device. While this guidance is still in draft form, we believe that it states the FDA’s current position, and it is possible that KB004 may not be approved until the FDA has sufficient information to also approve or clear our companion device. Moreover, the FDA’s expectations for in vitro companion diagnostics are evolving and some aspects of the FDA’s regulatory approach remain unclear. The FDA’s developing expectations will affect, among other things, the development, testing and review of any in vitro companion diagnostics.

Because our companion diagnostic candidate is at an early stage of development, and because we have not yet decided whether to pursue a reference lab-based test or a kit, we have yet to seek a meeting with the FDA to discuss our companion diagnostic test in development. We therefore do not yet know what the FDA will require for this test. We may not be able to develop or obtain approval or clearance for the companion diagnostic, and any delay or failure to obtain regulatory approval or clearance could delay development or prevent approval of KB004.

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If our competitors develop treatments for the target indications of our product candidates that are approved more quickly, marketed more successfully or demonstrated to be safer or more effective than our product candidates, our commercial opportunity will be reduced or eliminated.

We operate in highly competitive segments of the biotechnology and biopharmaceutical markets. We face competition from many different sources, including commercial pharmaceutical and biotechnology enterprises, academic institutions, government agencies, and private and public research institutions. Our product candidates, if successfully developed and approved, will compete with established therapies as well as with new treatments that may be introduced by our competitors. Many of our competitors have significantly greater financial, product candidate development, manufacturing, and marketing resources than we do. Large pharmaceutical and biotechnology companies have extensive experience in clinical testing and obtaining regulatory approval for drugs. In addition, many universities and private and public research institutes are active in cancer research, some in direct competition with us. We also may compete with these organizations to recruit management, scientists, and clinical development personnel. Smaller or early-stage companies may also prove to be significant competitors, particularly through collaborative arrangements with large and established companies. New developments, including the development of other pharmaceutical technologies and methods of treating disease, occur in the pharmaceutical and life sciences industries at a rapid pace. Developments by competitors may render our product candidates obsolete or noncompetitive. We will also face competition from these third parties in recruiting and retaining qualified personnel, establishing clinical trial sites, and registering subjects for clinical trials, and in identifying and in-licensing new product candidates.

There are several companies developing treatments for Pa infections using antibiotics or alternative approaches. For example, Insmed is developing an inhaled formulation of amikacin, Arikace, for the treatment of Pa infection in CF. Valneva (formerly Intercell) in collaboration with Novartis has a prophylactic vaccine in a Phase 2/3 clinical trial for the prevention of Pa infection in mechanically ventilated intensive care unit patients. There are two inhaled antibiotics (Tobi® and Cayston®) that have been approved for the treatment of Pa infection in CF. We are also aware of one biologic drug (Pulmozyme®) that is approved in the United States to treat respiratory problems in CF patients. KALYDECO®, a small-molecule drug that helps improve the function of a defective protein that causes CF, was approved by the FDA. VX-809 is a compound being developed by Vertex Pharmaceuticals, Inc. in Phase 3 clinical trials in combination with KALYDECO for CF.

Competition in cancer drug development including hematology/oncology is intense, with more than 250 compounds in clinical trials by large pharmaceutical and biotechnology companies. Many of these companies are focused on targeted therapies. We anticipate that we will face intense and increasing competition as new treatments enter the market and advanced technologies become available. In addition, the development program that we undertake may change from time to time due to clinical or non-clinical results, competitive developments, regulatory changes, recruitment, resource or other constraints in running clinical studies and other factors.

We are subject to a multitude of manufacturing risks, any of which could substantially increase our costs and limit supply of our products.

The process of manufacturing our products is complex, highly regulated and subject to several risks, including:

· The process of manufacturing biologics, such as KB001-A and KB004, is extremely susceptible to product loss due to contamination, equipment failure or improper installation or operation of equipment, or vendor or operator error. Even minor deviations from normal manufacturing processes could result in reduced production yields, product defects and other supply disruptions. If microbial, viral or other contaminations are discovered in our products or in the manufacturing facilities in which our products are made, such manufacturing facilities may need to be closed for an extended period of time to investigate and remedy the contamination.

· The manufacturing facilities in which our products are made could be adversely affected by equipment failures, plant closures, capacity constraints, competing customer priorities, process failures, materials or labor shortages, natural disasters, power failures and numerous other factors.

· We are dependent upon Sanofi to supply drug substance for our KB001-A clinical trials and for commercial sale if KB001-A is ultimately approved by the appropriate regulatory authorities.

· We, our contract manufacturers, and Sanofi must comply with the FDA’s current Good Manufacturing Practice (cGMP) regulations and guidelines. We, our contract manufacturers, and Sanofi may encounter difficulties in achieving quality control and quality assurance and may experience shortages in qualified personnel. We, our contract manufacturers, and Sanofi are subject to inspections by the FDA and comparable agencies in other jurisdictions to confirm compliance with applicable regulatory requirements. Any failure to follow cGMP or other regulatory requirements or delay, interruption or other issues that arise in the manufacture, 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 comply with regulatory requirements or pass any regulatory authority inspection could significantly impair our ability to

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develop and commercialize our products, including leading to significant delays in the availability of products for our clinical studies or the termination or hold on a clinical study, or the delay or prevention of a filing or approval of marketing applications for our product candidates. Significant noncompliance could also result in the imposition of sanctions, including fines, injunctions, civil penalties, failure of regulatory authorities to grant marketing approvals for our product candidates, delays, suspension or withdrawal of approvals, license revocation, seizures or recalls of products, operating restrictions and criminal prosecutions, any of which could damage our reputation. If we are not able to maintain regulatory compliance, we may not be permitted to market our products and/or may be subject to product recalls, seizures, injunctions, or criminal prosecution.

· Any adverse developments affecting manufacturing operations for our products may result in shipment delays, inventory shortages, lot failures, product withdrawals or recalls, or other interruptions in the supply of our products. We may also have to take inventory write-offs and incur other charges and expenses for products that fail to meet specifications, undertake costly remediation efforts or seek more costly manufacturing alternatives.

If we are not successful in discovering, developing, acquiring and commercializing additional product candidates, our ability to expand our business will be limited.

A substantial amount of our effort is focused on the continued clinical testing and potential approval of our current product candidates and expanding our product candidates to serve other indications of high unmet medical needs. Research programs to identify other indications require substantial technical, financial and human resources, whether or not any product candidates for other indications are ultimately identified. Our research programs may initially show promise in identifying potential product candidates, yet fail to yield product candidates for clinical development for many reasons, including the following:

· the research methodology used may not be successful in identifying potential product candidates;

· competitors may develop alternatives that render our product candidates obsolete or less attractive;

· product candidates we develop may nevertheless be covered by third parties’ patents or other exclusive rights;

· a product candidate may on further study be shown to have harmful side effects or other characteristics that indicate it is unlikely to be effective or otherwise does not meet applicable regulatory criteria;

· a product candidate may not be capable of being produced in commercial quantities at an acceptable cost, or at all; and

· A product candidate may not be accepted as safe and effective by patients, the medical community or third-party payers, if applicable.

In addition, while our agreement with Sanofi remains in effect, neither we nor our affiliates may develop or commercialize any other anti-Pa antibody. This would apply to a future acquiror, except with respect to any anti—Pa antibody of the acquiror existing on the date of acquisition and developed thereafter.

If we do not successfully develop and commercialize product candidates for other indications, our business and future prospects may be limited and our business will be more vulnerable to problems that we encounter in developing and commercializing our current product candidates.

If any product candidate that we successfully develop does not achieve broad market acceptance among physicians, patients, healthcare payors and the medical community, the revenue that it generates may be limited.

Even if our product candidates receive regulatory approval, they may not gain market acceptance among physicians, patients, healthcare payors, and the medical community. Coverage and reimbursement of our product candidates by third-party payors, including government payors, generally is also necessary for commercial success. The degree of market acceptance of any approved product candidates will depend on a number of factors, including:

· the efficacy and safety as demonstrated in clinical trials;

· the clinical indications for which the product candidate is approved;

· acceptance by physicians, major operators of hospitals and clinics, and patients of the product candidate as a safe and effective treatment;

· the potential and perceived advantages of product candidates over alternative treatments;

· the safety of product candidates seen in a broader patient group, including its use outside the approved indications;

· the cost of treatment in relation to alternative treatments;

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· the availability of adequate reimbursement and pricing by third parties and government authorities;

· relative convenience and ease of administration;

· the prevalence and severity of adverse events;

· the effectiveness of our sales and marketing efforts; and

· unfavorable publicity relating to the product candidate.

If any product candidate is approved but does not achieve an adequate level of acceptance by physicians, hospitals, healthcare payors, and patients, we may not generate sufficient revenue from that product candidate and may not become or remain profitable.

Reimbursement may be limited or unavailable in certain market segments for our product candidates, which could make it difficult for us to sell our product candidates profitably.

Market acceptance and sales of our product candidates will depend significantly on the availability of adequate insurance coverage and reimbursement from third-party payors for any of our product candidates and may be affected by existing and future health care reform measures. Government authorities and third-party payors, such as private health insurers and health maintenance organizations, decide which drugs they will pay for and establish reimbursement levels. Reimbursement by a third-party payor may depend upon a number of factors including the third-party payor’s determination that use of a product candidate is:

· a covered benefit under its health plan;

· safe, effective, and medically necessary;

· appropriate for the specific patient;

· cost effective; and

· neither experimental nor investigational.

Obtaining coverage and reimbursement approval for a product candidate from a government or other third-party payor is a time-consuming and costly process that could require us to provide supporting scientific, clinical, and cost effectiveness data for the use of our product candidates to the payor. We may not be able to provide data sufficient to gain acceptance with respect to coverage and reimbursement. We cannot be sure that coverage or adequate reimbursement will be available for any of our product candidates. Also, we cannot be sure that reimbursement amounts will not reduce the demand for, or the price of, our product candidates. If reimbursement is not available or is available only to limited levels or with restrictions, we may not be able to commercialize certain of our product candidates profitably, or at all, even if approved.

In the United States and in certain foreign jurisdictions, there have been a number of legislative and regulatory changes to the health care system that could affect our ability to sell our product candidates profitably. In particular, the Medicare Modernization Act of 2003 revised the payment methods for many product candidates under Medicare. This has resulted in lower rates of reimbursement. There have been numerous other federal and state initiatives designed to reduce payment for pharmaceuticals.

As a result of legislative proposals and the trend toward managed health care in the United States, third-party payors are increasingly attempting to contain health care costs by limiting both coverage and the level of reimbursement of new drugs. They may also refuse to provide coverage of approved product candidates for medical indications other than those for which the FDA has granted market approvals. As a result, significant uncertainty exists as to whether and how much third-party payors will reimburse patients for their use of newly approved drugs, which in turn will put pressure on the pricing of drugs. We expect to experience pricing pressures in connection with the sale of our product candidates due to the trend toward managed health care, the increasing influence of health maintenance organizations, and additional legislative proposals as well as country, regional, or local healthcare budget limitations.

If we are unable to establish sales and marketing capabilities or fail to enter into agreements with third parties to market and sell any product candidates we may successfully develop, we may not be able to effectively market and sell any such product candidates.

We do not currently have any infrastructure for the sale, marketing, and distribution of any of our product candidates once approved, if at all, and we must build this infrastructure or make arrangements with third parties to perform these functions in order to commercialize any product candidates for which we may obtain approval. The establishment and development of a sales force, either by us or jointly with a development partner, or the establishment of a contract sales force to market any product candidates we may develop will be expensive and time consuming and could delay any product candidate launch. If we, Sanofi, or any of our future development partners are unable to establish sales and marketing capabilities or any other nontechnical capabilities necessary to commercialize any product candidates we may successfully develop, we will need to contract with third parties to market and sell such product candidates. We may not be able to establish arrangements with third parties on acceptable terms, if at all.

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If we are acquired by a pharmaceutical company with a significant market capitalization, Sanofi may exercise an option to exclusively assume all aspects of development and commercialization of licensed products in Pa-infected patients with CF or bronchiectasis worldwide, in which case the revenue we would generate from those licensed products would be limited.

Under our license and collaboration agreement with Sanofi, if we are acquired by a top 25 pharmaceutical company based on market capitalization at the time of such acquisition, Sanofi has the option to exclusively assume all aspects of development and commercialization of licensed products to treat Pa-infected patients with CF or bronchiectasis worldwide. If Sanofi exercises this option, our rights to participate in development and commercialization of the licensed products in Pa-infected patients with CF or bronchiectasis would terminate and the revenue generated from the commercialization of those licensed products would be limited to the amounts Sanofi would be required to pay pursuant to its agreement with us. This provision may adversely impact a company’s desire to acquire us.

If we fail to attract and retain key management and clinical development personnel, we may be unable to successfully develop or commercialize our product candidates.

We will need to effectively manage our managerial, operational, financial, and other resources in order to successfully pursue our clinical development and commercialization efforts. As a company with a limited number of personnel, we are highly dependent on the development, regulatory, commercial, and financial expertise of the members of our senior management, in particular David W. Pritchard, our president and chief executive officer, and Nestor A. Molfino, chief medical officer. The loss of such individuals or the services of any of our other senior management could delay or prevent the further development and potential commercialization of our product candidates and, if we are not successful in finding suitable replacements, could harm our business.

Our success also depends on our continued ability to attract, retain, and motivate highly qualified management and scientific personnel and we may not be able to do so in the future due to intense competition among biotechnology and pharmaceutical companies, universities, and research organizations for qualified personnel. If we are unable to attract and retain the necessary personnel, we may experience significant impediments to our ability to implement our business strategy.

If we fail to effectively integrate our new executive officers into our organization, the future development and commercialization of our product candidates may suffer, harming future regulatory approvals, sales of our product candidates or our results of operations.

Certain members of our executive team have not worked together as a group for a significant period of time. For example, on October 22, 2013, we appointed our new Chief Financial Officer. Our future performance will depend, in part, on our ability to successfully integrate our newly hired executive officers into our management team and our ability to develop an effective working relationship among senior management. Our failure to integrate these individuals and create effective working relationships among them and other members of management could result in inefficiencies in the development and commercialization of our product candidates, harming future regulatory approvals, sales of our product candidates and our results of operations.

We face potential product liability exposure and, if successful claims are brought against us, we may incur substantial liability for a product candidate and may have to limit its commercialization.

The use of our product candidates in clinical trials and the sale of any product candidates for which we may obtain marketing approval expose us to the risk of product liability claims. Product liability claims may be brought against us, Sanofi, or any of our future development partners by participants enrolled in our clinical trials, patients, health care providers, or others using, administering, or selling our product candidates. If we cannot successfully defend ourselves against any such claims, we would incur substantial liabilities. Regardless of merit or eventual outcome, product liability claims may result in:

· withdrawal of clinical trial participants;

· termination of clinical trial sites or entire trial programs;

· costs of related litigation;

· substantial monetary awards to trial participants or other claimants;

· decreased demand for our product candidates and loss of revenue;

· impairment of our business reputation;

· diversion of management and scientific resources from our business operations; and

· the inability to commercialize our product candidates.

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We have obtained limited product liability insurance coverage for our clinical trials domestically and in selected foreign countries where we are conducting clinical trials. As such, our insurance coverage may not reimburse us or may not be sufficient to reimburse us for any expenses or losses we may suffer. Moreover, insurance coverage is becoming increasingly expensive and in the future we may not be able to maintain insurance coverage at a reasonable cost or in sufficient amounts to protect us against losses due to product liability. We intend to expand our insurance coverage for product candidates to include the sale of commercial products if we obtain marketing approval for our product candidates in development; however, we may be unable to obtain commercially reasonable product liability insurance for any product candidates approved for marketing. Large judgments have been awarded in class action lawsuits based on drugs that had unanticipated side effects. A successful product liability claim or series of claims brought against us, particularly if judgments exceed our insurance coverage, could decrease our working capital and adversely affect our business.

Our insurance policies are expensive and protect us only from some business risks, which leaves us exposed to significant uninsured liabilities.

We do not carry insurance for all categories of risk that our business may encounter. For example, we do not carry earthquake insurance. In the event of a major earthquake in our region, our business could suffer significant and uninsured damage and loss. Some of the policies we currently maintain include general liability, employment practices liability, property, auto, workers’ compensation, products liability, and directors’ and officers’ insurance. We do not know, however, if we will be able to maintain existing insurance with adequate levels of coverage. Any significant, uninsured liability may require us to pay substantial amounts, which would adversely affect our working capital and results of operations.

Our employees may engage in misconduct or other improper activities including noncompliance with regulatory standards and requirements and insider trading.

As with any business, we are exposed to the risk of employee fraud or other misconduct. Misconduct by employees could include intentional failures to comply with FDA regulations, provide accurate information to regulatory authorities, comply with manufacturing standards we have established, comply with federal and state health care fraud and abuse laws and regulations, report financial information or data accurately, or disclose unauthorized activities to us. In particular, sales, marketing, and business arrangements in the health care industry are subject to extensive laws and regulations intended to prevent fraud, kickbacks, self-dealing, and other abusive practices. These laws and regulations may restrict or prohibit a wide range of pricing, discounting, marketing and promotion, sales commission, customer incentive programs, and other business arrangements. Employee misconduct could also involve improper use of information obtained in the course of clinical trials, which could result in regulatory sanctions and serious harm to our reputation.

In addition, during the course of our operations our directors, executives, and employees may have access to material, nonpublic information regarding our business, our results of operations, or potential transactions we are considering. We may not be able to prevent a director, executive, or employee from trading in our common stock on the basis of, or while having access to, material, nonpublic information. If a director, executive, or employee was to be investigated or an action was to be brought against a director, executive, or employee for insider trading, it could have a negative impact on our reputation and our stock price. Such a claim, with or without merit, could also result in substantial expenditures of time and money, and divert attention of our management team from other tasks important to the success of our business.

We may encounter difficulties in managing our growth and expanding our operations successfully.

As we seek to advance our product candidates through clinical trials we will need to expand our development, regulatory, manufacturing, marketing, and sales capabilities, collaborate with Sanofi and contract with third parties to provide these capabilities for us. As our operations expand we expect that we will need to manage additional relationships with various development partners, suppliers, and other third parties. Future growth will impose significant added responsibilities on members of management. Our future financial performance and our ability to commercialize our product candidates and to compete effectively will depend in part on our ability to manage any future growth effectively. To that end, we must be able to manage our development efforts and clinical trials effectively. We may not be able to accomplish these tasks and our failure to accomplish any of them could prevent us from successfully growing our company.

Our loan and security agreement contains restrictions that limit our flexibility in operating our business.

In September 2012, we entered into a loan and security agreement with MidCap Financial and drew down $5.0 million under the facility. In December 2012, we drew down an additional $5.0 million under the facility. The final draw down of $5.0 million is required before May 2014. The agreement contains various covenants that limit our ability to engage in specified types of transactions. These covenants limit our ability to, among other things:

· incur or assume certain debt;

· merge or consolidate;

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· change the nature of our business;

· change our organizational structure or type;

· dispose of certain assets;

· grant liens on our assets;

· make certain investments;

· pay dividends; and

· enter into material transactions with affiliates.

A breach of any of these covenants or a material adverse change to our business, operations, or condition (financial or otherwise) could result in a default under the loan. In the case of a continuing event of default under the loan, MidCap Financial could elect to declare all amounts outstanding to be immediately due and payable and terminate all commitments to extend further credit, commence and prosecute bankruptcy and/or other insolvency proceedings, or proceed against the collateral granted to MidCap Financial under the loan. Amounts outstanding under the term loan are secured by all of our existing and future assets (excluding intellectual property, which is subject to a negative pledge arrangement). A default and any accompanying repayment could have a material adverse effect on our business, operating results and financial condition.

We and our development partner, third-party manufacturers and suppliers use biological materials and may use hazardous materials, and any claims relating to improper handling, storage, or disposal of these materials could be time consuming or costly.

We and our development partner, third-party manufacturers and suppliers may use hazardous materials, including chemicals and biological agents and compounds that could be dangerous to human health and safety or the environment. Our operations and the operations of our development partner, third-party manufacturers and suppliers also produce hazardous waste products. Federal, state, and local laws and regulations govern the use, generation, manufacture, storage, handling, and disposal of these materials and wastes. Compliance with applicable environmental laws and regulations may be expensive and current or future environmental laws and regulations may impair our product development efforts. In addition, we cannot entirely eliminate the risk of accidental injury or contamination from these materials or wastes. We do not carry specific biological or hazardous waste insurance coverage and our property, casualty, and general liability insurance policies specifically exclude coverage for damages and fines arising from biological or hazardous waste exposure or contamination. Accordingly, in the event of contamination or injury we could be held liable for damages or be penalized with fines in an amount exceeding our resources, and our clinical trials or regulatory approvals could be suspended.

Our internal computer systems, or those of our development partner, third-party clinical research organizations or other contractors or consultants, may fail or suffer security breaches, which could result in a material disruption of our product development programs.

Despite the implementation of security measures, our internal computer systems and those of our development partner, third-party clinical research organizations and other contractors and consultants are vulnerable to damage from computer viruses, unauthorized access, natural disasters, terrorism, war, and telecommunication and electrical failures. While we have not experienced any such system failure, accident, or security breach to date, if such an event were to occur and cause interruptions in our operations, it could result in a material disruption of our programs. For example, the loss of clinical trial data for any of our product candidates could result in delays in our regulatory approval efforts and significantly increase our costs to recover or reproduce the data. To the extent that any disruption or security breach results in a loss of or damage to our data or applications or other data or applications relating to our technology or product candidates, or inappropriate disclosure of confidential or proprietary information, we could incur liabilities and the further development of our product candidates could be delayed.

Healthcare reform measures, when implemented, could hinder or prevent our commercial success.

There have been, and likely will continue to be, legislative and regulatory proposals at the federal and state levels directed at broadening the availability of health care and containing or lowering the cost of health care. We cannot predict the initiatives that may be adopted in the future. The continuing efforts of the government, insurance companies, managed care organizations, and other payors of healthcare services to contain or reduce costs of health care may adversely affect:

· the demand for any drug products for which we may obtain regulatory approval;

· our ability to set a price that we believe is fair for our product candidates;

· our ability to generate revenue and achieve or maintain profitability;

· the level of taxes that we are required to pay; and

· the availability of capital.

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Governments may impose price controls, which may adversely affect our future profitability.

We intend to seek approval to market our future product candidates in both the United States and in foreign jurisdictions. If we obtain approval in one or more foreign jurisdictions, we will be subject to rules and regulations in those jurisdictions relating to our product candidates. In some foreign countries, particularly in the European Union, the pricing of prescription pharmaceuticals and biologics is subject to governmental control. In these countries, pricing negotiations with governmental authorities can take considerable time after the receipt of marketing approval for a product candidate. If reimbursement of our future products is unavailable or limited in scope or amount, or if pricing is set at unsatisfactory levels, we may be unable to achieve or sustain profitability.

We, Sanofi, and any of our future development partners will be required to report to regulatory authorities if any of our approved products cause or contribute to adverse medical events, and any failure to do so would result in sanctions that would materially harm our business.

If we, Sanofi, and any of our future development partners are successful in commercializing our products, the FDA and foreign regulatory authorities would require that we, Sanofi, and any of our future development partners report certain information about adverse medical events if those products may have caused or contributed to those adverse events. The timing of our obligation to report would be triggered by the date we become aware of the adverse event as well as the nature of the event. We, Sanofi, and any of our future development partners may fail to report adverse events we become aware of within the prescribed timeframe. We, Sanofi, and any of our future development partners may also fail to appreciate that we have become aware of a reportable adverse event, especially if it is not reported to us as an adverse event or if it is an adverse event that is unexpected or removed in time from the use of our products. If we, Sanofi, and any of our future development partners fail to comply with our reporting obligations, the FDA or a foreign regulatory authority could take action including criminal prosecution, the imposition of civil monetary penalties, seizure of our products, or delay in approval or clearance of future products.

Our product candidates for which we and our development partner intend to seek approval as biologic products may face competition sooner than anticipated.

With the enactment of the Biologics Price Competition and Innovation Act of 2009 (BPCIA) as part of the Affordable Care Act, an abbreviated pathway for the approval of dissimilar and interchangeable biological products was created. The abbreviated regulatory pathway establishes legal authority for the FDA to review and approve biosimilar biologics, including the possible designation of a biosimilar as ‘‘interchangeable’’ based on its similarity to an existing brand product. Under the BPCIA, an application for a biosimilar product cannot be approved by the FDA until 12 years after the original branded product was approved under a BLA. The law is complex and is still being interpreted and implemented by the FDA. As a result, its ultimate impact, implementation, and meaning are subject to uncertainty. While it is uncertain when such processes intended to implement BPCIA may be fully adopted by the FDA, any such processes could have a material adverse effect on the future commercial prospects for our biological products.

We believe that any of our product candidates approved as a biological product under a BLA should qualify for the 12-year period of exclusivity. However, there is a risk that the FDA will not consider our product candidates to be reference products for competing products, potentially creating the opportunity for generic competition sooner than anticipated. Moreover, the extent to which a biosimilar, once approved, will be substituted for any one of our reference products in a way that is similar to traditional generic substitution for non-biological products is not yet clear, and will depend on a number of marketplace and regulatory factors that are still developing. Finally, there is a risk that the 12-year exclusivity period could be reduced which could negatively affect our products.

In addition, foreign regulatory authorities may also provide for exclusivity periods for approved biological products. For example, biological products in Europe may be eligible for a 10-year period of exclusivity. However, biosimilar products have been approved under a sub-pathway of the centralized procedure since 2006. The pathway allows sponsors of a biosimilar product to seek and obtain regulatory approval based in part on the clinical trial data of an originator product to which the biosimilar product has been demonstrated to be ‘‘similar.’’ In many cases, this allows biosimilar products to be brought to market without conducting the full suite of clinical trials typically required of originators. It is unclear whether we and our development partner would face competition to our products in European markets sooner than anticipated.

We may in the future be subject to various U.S. federal and state laws pertaining to health care fraud and abuse, including anti-kickback, self-referral, false claims and fraud laws, and any violations by us of such laws could result in fines or other penalties.

If one or more of our product candidates is approved, we will likely be subject to the various U.S. federal and state laws intended to prevent health care fraud and abuse. The federal anti-kickback statute prohibits the offer, receipt, or payment of remuneration in exchange for or to induce the referral of patients or the use of products or services that would be paid for in whole or part by Medicare, Medicaid or other federal health care programs. Remuneration has been broadly defined to include anything of value, including cash, improper discounts, and free or reduced price items and services. Many states have similar laws that apply to their state health care programs as well as private payors. Violations of the anti-kickback laws can result in exclusion from federal health care programs and substantial civil and criminal penalties.

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The False Claims Act (FCA) imposes liability on persons who, among other things, present or cause to be presented false or fraudulent claims for payment by a federal health care program. The FCA has been used to prosecute persons submitting claims for payment that are inaccurate or fraudulent, that are for services not provided as claimed, or for services that are not medically necessary. The FCA includes a whistleblower provision that allows individuals to bring actions on behalf of the federal government and share a portion of the recovery of successful claims. If our marketing or other arrangements were determined to violate the FCA or anti-kickback or related laws, then our revenue could be adversely affected, which would likely harm our business, financial condition, and results of operations.

State and federal authorities have aggressively targeted medical technology companies for alleged violations of these anti-fraud statutes, based on improper research or consulting contracts with doctors, certain marketing arrangements that rely on volume-based pricing, off-label marketing schemes, and other improper promotional practices. Companies targeted in such prosecutions have paid substantial fines in the hundreds of millions of dollars or more, have been forced to implement extensive corrective action plans or Corporate Integrity Agreements, and have often become subject to consent decrees severely restricting the manner in which they conduct their business. If we become the target of such an investigation or prosecution based on our contractual relationships with providers or institutions, or our marketing and promotional practices, we could face similar sanctions, which would materially harm our business.

Also, the Foreign Corrupt Practices Act and similar worldwide anti-bribery laws generally prohibit companies and their intermediaries from making improper payments to non-U.S. officials for the purpose of obtaining or retaining business. We cannot assure you that our internal control policies and procedures will protect us from reckless or negligent acts committed by our employees, future distributors, partners, collaborators or agents. Violations of these laws, or allegations of such violations, could result in fines, penalties, or prosecution and have a negative impact on our business, results of operations and reputation.

Legislative or regulatory healthcare reforms in the United States may make it more difficult and costly for us to obtain regulatory approval of our product candidates and to produce, market, and distribute our products after approval is obtained.

From time to time, legislation is drafted and introduced in Congress that could significantly change the statutory provisions governing the regulatory approval, manufacture, and marketing of regulated products or the reimbursement thereof. In addition, FDA regulations and guidance are often revised or reinterpreted by the FDA in ways that may significantly affect our business and our products. Any new regulations or revisions or reinterpretations of existing regulations may impose additional costs or lengthen review times of our current product candidates or any future product candidates. We cannot determine what effect changes in regulations, statutes, legal interpretation or policies, when and if promulgated, enacted or adopted may have on our business in the future. Such changes could, among other things, require:

· changes to manufacturing methods;

· additional studies, including clinical studies;

· recall, replacement, or discontinuance of one or more of our products; and

· additional record keeping.

Each of these would likely entail substantial time and cost and could materially harm our business and our financial results. In addition, delays in receipt of or failure to receive regulatory approvals for any future products would harm our business, financial condition, and results of operations.

Even if we are able to obtain regulatory approval for our product candidates, we will continue to be subject to ongoing and extensive regulatory requirements, and our failure to comply with these requirements could substantially harm our business.

If we receive regulatory approval for our product candidates, we will be subject to ongoing FDA obligations and continued regulatory oversight and review, such as continued safety reporting requirements, and we may also be subject to additional FDA post-marketing obligations. If we are not able to maintain regulatory compliance, we may not be permitted to market our product candidates and/or may be subject to product recalls or seizures.

If the FDA approves any of our product candidates, the labeling, packaging, adverse event reporting, storage, advertising, promotion and record-keeping for our products will be subject to extensive regulatory requirements. The subsequent discovery of previously unknown problems with the products, including adverse events of unanticipated severity or frequency, may result in restrictions on the marketing of the product, and could include withdrawal of the product from the market.

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Our ability to utilize our net operating loss carryforwards and certain other tax attributes may be limited.

We have incurred substantial losses during our history and do not expect to become profitable in the foreseeable future and may never achieve profitability. To the extent that we continue to generate taxable losses, unused losses will carry forward to offset future taxable income, if any, until such unused losses expire. We may be unable to use these losses to offset income before such unused losses expire. Under Section 382 of the Internal Revenue Code, if a corporation undergoes an ‘‘ownership change’’ (generally defined as a greater than 50% change (by value) in its equity ownership over a three year period), the corporation’s ability to use its pre-change net operating loss carryforwards and other pre-change tax attributes to offset its post-change income may be limited. We have in the past experienced ownership changes that have resulted in limitations on the use of a portion of our net operating loss carryforwards. If we experience further ownership changes our ability to utilize our net operating loss carryforwards could be further limited.

Risks Related to Our Dependence on Third Parties

We are dependent on Sanofi for the development and commercialization of KB001-A, and Sanofi’s failure to develop and/or commercialize KB001-A would result in a material adverse effect on our business and operating results.

We have granted Sanofi an exclusive license to KB001, KB001-A and other antibodies directed against the PcrV protein of Pa for all indications for most aspects of their development and commercialization. Our development partnership with Sanofi on KB001-A or other antibodies may not be scientifically, medically, technically or commercially successful due to a number of important factors, including the following:

· Sanofi’s obligation to use ‘‘commercially reasonable efforts’’ under our agreement leaves Sanofi with significant discretion in determining the efforts and resources that it will apply to the development and commercialization of KB001-A or other antibodies directed against the PcrV protein of Pa. The timing and amount of any contingent and royalty payments we may receive under our agreement will depend on, among other things, the efforts, allocation of resources,and successful development and commercialization of our product candidate by Sanofi under our agreement;

· Sanofi holds the rights to commercialize KB001-A, including for Pa in CF and bronchiectasis patients, and holds an option to assume primary responsibility for developing and promoting KB001-A for such indications. Sanofi may not choose to exercise its option to develop and promote KB001-A or other licensed products in Pa-infected patients with CF or bronchiectasis and has no contractual obligation to do so. If Sanofi does not exercise its option for the CF or bronchiectasis indications, Sanofi will nevertheless retain the exclusive obligation to perform certain necessarycommercial activities other than promotion (including the exclusive right to sell and distribute KB001-A) with respect to such indications but we will have little or no control over Sanofi’s diligence in performing such activities. In such event, if we disagreed with Sanofi over the extent of their commercialization activities for KB001-A for the CF or bronchiectasis indications, and we wished to take over full commercialization of KB001-A for either of these indications if approved, we would need to renegotiate with Sanofi certain terms of our agreement but may be unable to do so on reasonable terms, in a timely manner, or at all;

· Sanofi may change the focus of its development and commercialization efforts or pursue higher- priority programs;

· Sanofi may not make timely regulatory submissions for KB001-A;

· Subject to our promotional rights in the CF or bronchiectasis indications, Sanofi will have substantial control over the commercialization of KB001-A and other antibodies directed against the PcrV protein of Pa for all indications, including in CF or bronchiectasis patients, whether or not Sanofi chooses to exercise its option to develop KB001-A for such indications. Sanofi’s commercialization objectives for different indications may not be consistent with our goals and there can be no assurance that Sanofi will want to commercialize KB001-A or other antibodies directed against the PcrV protein of Pa in a manner that maximizes our revenue. In addition, we may find that we cannot reach agreement over some of the development and commercialization aspects of KB001-A or other antibodies directed against the PcrV protein of Pa, resulting in program delays, termination, or other decisions that might have a material impact on our business;

· Sanofi may fail to manufacture or supply sufficient drug substance of KB001-A for our clinical use, such as our CF study, which could result in program delays;

· Sanofi may fail to manufacture or supply sufficient drug substance of KB001-A for our commercial use, if approved, which could result in lost revenue;

· we and Sanofi may fail to agree on the specific terms of the option price, or a profit sharing arrangement within the United States, for the CF indication in the event that Sanofi elects the shared U.S. territory option;

· Sanofi may utilize our intellectual property rights or take actions related to licensed products in such a way as to invite litigation that could jeopardize or invalidate our intellectual property rights or expose us to potential liability;

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· if we are acquired by a pharmaceutical company with a significant market capitalization, Sanofi may exercise its option to exclusively assume all aspects of development and commercialization of licensed products in Pa-infected CF and bronchiectasis patients worldwide;

· Sanofi may not comply with all applicable regulatory requirements or may fail to report safety data in accordance with all applicable regulatory requirements;

· Sanofi may terminate the agreement with us for convenience upon 180 days’ prior written notice;

· if Sanofi were to breach or terminate the agreement with us, the development and commercialization of KB001-A or other antibodies directed against the PcrV protein of Pa could be delayed. We would need to either use our own resources and capabilities to continue the development and commercialization of KB001-A or grant rights to another development or commercial partner;

· if Sanofi were to terminate its arrangements with us, our potential revenue under our agreement with Sanofi, including from potential development and commercial contingent payments and royalties on net sales of licensed products, would be significantly reduced; and

· Sanofi may not dedicate the resources that would be necessary to carry the product candidate through clinical development or may not obtain the necessary regulatory approvals.

Sanofi’s failure to develop, manufacture or effectively commercialize KB001-A or other antibodies directed against the PcrV protein of Pa would result in a material adverse effect on our business and results of operations and would likely cause our stock price to decline.

We rely on third parties to conduct our clinical trials. If these third parties do not meet our deadlines or otherwise conduct the trials as required, our clinical development programs could be delayed or unsuccessful and we may not be able to obtain regulatory approval for or commercialize our product candidates when expected or at all.

We do not have the ability to conduct all aspects of our preclinical testing or clinical trials ourselves. We are dependent on Sanofi to conduct the Phase 2 and Phase 3 clinical trials for KB001-A for the prevention of Pa VAP and, therefore, the timing of the initiation and completion of these trials is controlled by Sanofi and may occur on substantially different timing from our estimates. We also use clinical research organizations (CROs) to conduct our clinical trials and rely on medical institutions, clinical investigators, CROs, and consultants to conduct our trials in accordance with our clinical protocols and regulatory requirements. Our CROs, investigators, and other third parties play a significant role in the conduct of these trials and subsequent collection and analysis of data.

There is no guarantee that any CROs, investigators, or other third parties on which we rely for administration and conduct of our clinical trials will devote adequate time and resources to such trials or perform as contractually required. If any of these third parties fails to meet expected deadlines, fails to adhere to our clinical protocols, or otherwise performs in a substandard manner, our clinical trials may be extended, delayed, or terminated. If any of our clinical trial sites terminates for any reason, we may experience the loss of follow-up information on subjects enrolled in our ongoing clinical trials unless we are able to transfer those subjects to another qualified clinical trial site. In addition, principal investigators for our clinical trials may serve as scientific advisors or consultants to us from time to time and may receive cash or equity compensation in connection with such services. If these relationships and any related compensation result in perceived or actual conflicts of interest, the integrity of the data generated at the applicable clinical trial site may be jeopardized.

We rely completely on third parties, most of which are sole source suppliers, to supply drug substance and manufacture drug product for our clinical trials and preclinical studies and intend to rely on other third parties to produce commercial supplies of product candidates, and our dependence on third parties could adversely impact our business.

We are completely dependent on our development partner, Sanofi or third-party suppliers, most of which are sole source suppliers of the drug substance and drug product for our product candidates. We are continually evaluating potential alternate sources of supply but there can be no guarantee that any such suppliers would be available, acceptable or successful. If these third-party suppliers do not supply sufficient quantities for product candidates to us on a timely basis and in accordance with applicable specifications and other regulatory requirements, there could be a significant interruption of our supplies, which would adversely affect clinical development of the product candidate. Furthermore, if any of our contract manufacturers cannot successfully manufacture material that conforms to our specifications and with regulatory requirements, we will not be able to secure and/or maintain regulatory approval, if any, for our product candidates. We are continually evaluating alternative sources of supply, and there can be no guarantee that any such source will be acceptable, available or successful.

We will also rely on our contract manufacturers to purchase from third-party suppliers the materials necessary to produce our product candidates for our anticipated clinical trials. There are a small number of suppliers for certain capital equipment and raw materials used to manufacture our product candidates. We do not have any control over the process or timing of the acquisition of these raw materials by our contract manufacturers. Moreover, we currently do not have agreements in place for the commercial production of these raw materials. Any significant delay in the supply of a product candidate or the raw material components thereof for an ongoing clinical trial could considerably delay completion of that clinical trial, product candidate testing, and potential regulatory approval of that product candidate.

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We do not expect to have the resources or capacity to commercially manufacture any of our proposed product candidates if approved, and will likely continue to be dependent on third-party manufacturers. Our dependence on third parties to manufacture and supply us with clinical trial materials and any approved product candidates may adversely affect our ability to develop and commercialize our product candidates on a timely basis.

We may not be successful in establishing and maintaining additional development partnerships, which could adversely affect our ability to develop and commercialize product candidates.

In addition to our current development partnership with Sanofi, a part of our strategy is to enter into additional development partnerships in the future, including collaborations with major biotechnology or pharmaceutical companies. We face significant competition in seeking appropriate development partners and the negotiation process is time consuming and complex. Moreover, we may not be successful in our efforts to establish a development partnership or other alternative arrangements for any of our other existing or future product candidates and programs because, among other reasons, our research and development pipeline may be insufficient, our product candidates and programs may be deemed to be at too early a stage of development for collaborative effort and/or third parties may not view our product candidates and programs as having the requisite potential to demonstrate safety and efficacy. Even if we are successful in our efforts to establish new development partnerships, the terms that we agree upon may not be favorable to us and we may not be able to maintain such development partnerships if, for example, development or approval of a product candidate is delayed or sales of an approved product candidate are disappointing. Any delay in entering into new development partnership agreements related to our product candidates could delay the development and commercialization of our product candidates and reduce their competitiveness if they reach the market.

Moreover, if we fail to establish and maintain additional development partnerships related to our product candidates:

· the development of certain of our current or future product candidates may be terminated or delayed;

· our cash expenditures related to development of certain of our current or future product candidates would increase significantly and we may need to seek additional financing;

· we may be required to hire additional employees or otherwise develop expertise, such as sales and marketing expertise, for which we have not budgeted; and

· we will bear all of the risk related to the development of any such product candidates.

Risks Related to Intellectual Property

Our success depends on our ability to protect our intellectual property and our proprietary technologies.

Our commercial success depends in part on our ability to obtain and maintain patent protection and trade secret protection for our product candidates, proprietary technologies, and their uses as well as our ability to operate without infringing upon the proprietary rights of others. There can be no assurance that our patent applications or those of our licensors will result in additional patents being issued or that issued patents will afford sufficient protection against competitors with similar technology, nor can there be any assurance that the patents issued will not be infringed, designed around, or invalidated by third parties. Even issued patents may later be found unenforceable or may be modified or revoked in proceedings instituted by third parties before various patent offices or in courts. The degree of future protection for our proprietary rights is uncertain. Only limited protection may be available and may not adequately protect our rights or permit us to gain or keep any competitive advantage. In addition, we may not have adequate resources to devote to the substantial costs of enforcing intellectual property rights in affected jurisdictions. Any failure to properly protect the intellectual property rights relating to these product candidates could have a material adverse effect on our financial condition and results of operations.

Composition-of-matter patents on the biological or chemical active pharmaceutical ingredient are generally considered to be the strongest form of intellectual property protection for pharmaceutical products, as such patents provide protection without regard to any method of use. We cannot be certain that the claims in our patent applications covering composition-of-matter of our product candidates will be considered patentable by the U.S. Patent and Trademark Office (USPTO) and courts in the United States or by the patent offices and courts in foreign countries, nor can we be certain that the claims in our issued composition-of-matter patents will not be found invalid or unenforceable if challenged. Method-of-use patents protect the use of a product for the specified method. This type of patent does not prevent a competitor from making and marketing a product that is identical to our product for an indication that is outside the scope of the patented method. Moreover, even if competitors do not actively promote their product for our targeted indications, physicians may prescribe these products ‘‘off-label.’’ Although off-label prescriptions may infringe or contribute to the infringement of method-of-use patents, the practice is common and such infringement is difficult to prevent or prosecute.

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The patent application process is subject to numerous risks and uncertainties, and there can be no assurance that we, Sanofi, or any of our future development partners will be successful in protecting our product candidates by obtaining and defending patents. These risks and uncertainties include the following:

· the USPTO and various foreign governmental patent agencies require compliance with a number of procedural, documentary, fee payment and other provisions during the patent process. There are situations in which noncompliance can result in abandonment or lapse of a patent or patent application, resulting in partial or complete loss of patent rights in the relevant jurisdiction. In such an event, competitors might be able to enter the market earlier than would otherwise have been the case;

· patent applications may not result in any patents being issued;

· patents that may be issued or in-licensed may be challenged, invalidated, modified, revoked, circumvented, found to be unenforceable, or otherwise may not provide any competitive advantage;

· our competitors, many of whom have substantially greater resources than we do and many of whom have made significant investments in competing technologies, may seek or may have already obtained patents that will limit, interfere with, or eliminate our ability to make, use, and sell our potential product candidates;

· there may be significant pressure on the U.S. government and international governmental bodies to limit the scope of patent protection both inside and outside the United States for disease treatments that prove successful, as a matter of public policy regarding worldwide health concerns; and

· countries other than the United States may have patent laws less favorable to patentees than those upheld by U.S. courts, allowing foreign competitors a better opportunity to create, develop, and market competing product candidates.

Furthermore, we and our development partners rely on the protection of our trade secrets and proprietary know-how. For example, we rely on Novartis, to whom we have licensed our Humaneered® platform, to protect our trade secrets and proprietary know-how that has been licensed to them. Although we have taken steps to protect our trade secrets and unpatented know-how, including entering into confidentiality agreements with third parties, and confidential information and inventions agreements with employees, consultants, and advisors, third parties may still obtain this information or may come upon this or similar information independently. If any of these events occurs or if we otherwise lose protection for our trade secrets or proprietary know-how, the value of this information may be greatly reduced.

Additionally, in the U.S., the central provisions of the Leahy-Smith America Invents Act (AIA) became effective on March 16, 2013. Among other things, this law will switch U.S. patent rights from the present ‘‘first-to-invent’’ system to a ‘‘first inventor-to-file’’ system. This may result in inventors and companies having to file patent applications more frequently to preserve rights in their inventions. This may favor larger competitors that have greater resources to file more patent applications.

If our trademarks and trade names are not adequately protected, then we may not be able to build name recognition in our markets of interest and our business may be adversely affected.

Our registered or unregistered trademarks or trade names may be challenged, infringed, circumvented or declared generic or determined to be infringing on other marks. We may not be able to protect our rights to these trademarks and trade names, which we need to build name recognition by potential partners or customers in our markets of interest. Over the long term, if we are unable to establish name recognition based on our trademarks and trade names, then we may not be able to compete effectively and our business may be adversely affected.

If we, Sanofi, or any of our future development partners are sued for infringing intellectual property rights of third parties, it will be costly and time consuming, and an unfavorable outcome in that litigation would have a material adverse effect on our business.

Our success also depends on our ability and the ability of Sanofi and any of our future development partners to develop, manufacture, market, and sell our product candidates without infringing upon the proprietary rights of third parties. Numerous U.S.-issued and foreign-issued patents and pending patent applications owned by third parties exist in the fields in which we are developing product candidates, some of which may contain claims that overlap with the subject matter of our intellectual property or are directed at our product candidates. When we become aware of patents held by third parties that may implicate the manufacture, development or commercialization of our product candidates, we evaluate our need to license rights to such patents. For example, we have entered into several licenses for the right to use third-party intellectual property, including with UCSF and LICR. If we need to license rights from third parties to manufacture, develop or commercialize our product candidates, there can be no assurance that we will be able to obtain a license on commercially reasonable terms or at all.

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Because patent applications can take many years to issue there may be currently pending applications, unknown to us, that may later result in issued patents upon which our product candidates or proprietary technologies may infringe. Similarly, there may be issued patents relevant to our product candidates of which we are not aware.

There is a substantial amount of litigation involving patent and other intellectual property rights in the biotechnology and pharmaceutical industries generally. If a third party claims that we or any of our licensors, suppliers, or development partners infringe upon a third party’s intellectual property rights, we may have to:

· seek to obtain licenses that may not be available on commercially reasonable terms, if at all;

· abandon an infringing product candidate or redesign our products or processes to avoid infringement;

· pay substantial damages including, in an exceptional case, treble damages and attorneys’ fees, which we may have to pay if a court decides that the product candidate or proprietary technology at issue infringes upon or violates the third party’s rights;

· pay substantial royalties or fees and/or grant cross-licenses to our technology; and/or

· defend litigation or administrative proceedings that may be costly whether we win or lose, and which could result in a substantial diversion of our financial and management resources.

Any such claims against us could also be deemed to constitute an event of default under our loan and security agreement with MidCap Financial. In the case of a continuing event of default under the loan, MidCap Financial could elect to declare all amounts outstanding to be immediately due and payable and terminate all commitments to extend further credit, commence and prosecute bankruptcy and/or other insolvency proceedings, or proceed against the collateral granted to MidCap Financial under the loan.

We may be involved in lawsuits to protect or enforce our patents or the patents of our licensors, which could be expensive, time consuming and unsuccessful.

Competitors may infringe upon our patents or the patents of our licensors. To counter infringement or unauthorized use, we may be required to file infringement claims, which can be expensive and time consuming. An adverse result in any litigation or defense proceedings could put one or more of our patents at risk of being invalidated, found to be unenforceable, or interpreted narrowly and could put our patent applications at risk of not issuing. Furthermore, because of the substantial amount of discovery required in connection with intellectual property litigation, there is a risk that some of our confidential information could be compromised by disclosure during this type of litigation.

Most of our competitors are larger than we are and have substantially greater resources. They are, therefore, likely to be able to sustain the costs of complex patent litigation longer than we could. In addition, the uncertainties associated with litigation could have a material adverse effect on our ability to raise the funds necessary to continue our clinical trials, continue our internal research programs, in-license needed technology, or enter into development partnerships that would help us bring our product candidates to market.

In addition, any future patent litigation, interference, or other administrative proceedings will result in additional expense and distraction of our personnel. An adverse outcome in such litigation or proceedings may expose us, Sanofi or any of our future development partners to loss of our proprietary position, expose us to significant liabilities, or require us to seek licenses that may not be available on commercially acceptable terms, if at all.

Our issued patents could be found invalid or unenforceable if challenged in court.

If we, Sanofi, or any of our future development partners were to initiate legal proceedings against a third party to enforce a patent covering one of our product candidates, or one of our future product candidates, the defendant could counterclaim that our patent is invalid and/or unenforceable. In patent litigation in the United States, defendant counterclaims alleging invalidity and/or unenforceability are commonplace. Grounds for a validity challenge could be an alleged failure to meet any of several statutory requirements, including lack of novelty, obviousness or non-enablement. Grounds for an unenforceability assertion could be an allegation that someone connected with prosecution of the patent withheld relevant information from the USPTO, or made a misleading statement, during prosecution. Third parties may also raise similar claims before the USPTO, even outside the context of litigation. The outcome following legal assertions of invalidity and unenforceability is unpredictable. With respect to the validity question, for example, we cannot be certain that there is no invalidating prior art, of which we and the patent examiner were unaware during prosecution. If a defendant were to prevail on a legal assertion of invalidity and/or unenforceability, we would lose at least part, and perhaps all, of the patent protection on such product candidate. Such a loss of patent protection would have a material adverse impact on our business.

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We may fail to comply with any of our obligations under existing agreements pursuant to which we license rights or technology, which could result in the loss of rights or technology that are material to our business.

We are a party to technology licenses that are important to our business and we may enter into additional licenses in the future. We currently hold licenses from the Medical College of Wisconsin, UCSF, LICR, BioWa, Lonza, and Sanofi. These licenses impose various commercial, contingent payments, royalty, insurance, indemnification, and other obligations on us. If we fail to comply with these obligations, the licensor may have the right to terminate the license, in which event we would lose valuable rights under our collaboration agreements and our ability to develop product candidates.

We may be subject to claims that our consultants or independent contractors have wrongfully used or disclosed alleged trade secrets of their other clients or former employers to us.

As is common in the biotechnology and pharmaceutical industry, we engage the services of consultants to assist us in the development of our product candidates. Many of these consultants were previously employed at, or may have previously or may be currently providing consulting services to, other biotechnology or pharmaceutical companies including our competitors or potential competitors. We may become subject to claims that our company or a consultant inadvertently or otherwise used or disclosed trade secrets or other information proprietary to their former employers or their former or current clients. Litigation may be necessary to defend against these claims. Even if we are successful in defending against these claims, litigation could result in substantial costs and be a distraction to our management team.

Changes in U.S. patent law could diminish the value of patents in general, thereby impairing our ability to protect our product candidates.

As is the case with other biopharmaceutical companies, our success is heavily dependent on intellectual property, particularly patents. Obtaining and enforcing patents in the biopharmaceutical industry involve technological and legal complexity. Therefore, obtaining and enforcing biopharmaceutical patents is costly, time consuming, and inherently uncertain. In addition, Congress may pass patent reform legislation. The Supreme Court has ruled on several patent cases in recent years, either narrowing the scope of patent protection available in certain circumstances or weakening the rights of patent owners in certain situations. In addition to increasing uncertainty with regard to our ability to obtain patents in the future, this combination of events has created uncertainty with respect to the value of patents, once obtained. Depending on decisions by the U.S. Congress, the federal courts, and the USPTO, the laws and regulations governing patents could change in unpredictable ways that would weaken our ability to obtain new patents or to enforce our existing patents and patents we might obtain in the future.

We may not be able to protect our intellectual property rights throughout the world.

Filing, prosecuting and defending patents on product candidates in all countries throughout the world would be prohibitively expensive, and we intend to seek patent protection only in selected countries. Our intellectual property rights in some countries outside the United States can be less extensive than those in the United States. In addition, the laws of some foreign countries do not protect intellectual property rights to the same extent as federal and state laws in the United States. Consequently, we may not be able to prevent third parties from practicing our inventions in all countries outside the United States, or from selling or importing products made using our inventions in and into the United States or other jurisdictions. Competitors may use our technologies in jurisdictions where we have not obtained patent protection to develop their own products and further, may export otherwise infringing products to territories where we have patent protection, but enforcement is not as strong as that in the United States. These products may compete with our product candidates and our patents or other intellectual property rights may not be effective or sufficient to prevent them from competing.

Many companies have encountered significant problems in protecting and defending intellectual property rights in foreign jurisdictions. The legal systems of certain countries, particularly certain developing countries, do not favor the enforcement of patents and other intellectual property protection, particularly those relating to biopharmaceuticals, which could make it difficult for us to stop the infringement of our patents or marketing of competing products in violation of our proprietary rights generally. Proceedings to enforce our patent rights in foreign jurisdictions could result in substantial costs and divert our efforts and attention from other aspects of our business, could put our patents at risk of being invalidated or interpreted narrowly and our patent applications at risk of not issuing and could provoke third parties to assert claims against us. We may not prevail in any lawsuits that we initiate and the damages or other remedies awarded, if any, may not be commercially meaningful. Accordingly, our efforts to enforce our intellectual property rights around the world may be inadequate to obtain a significant commercial advantage from the intellectual property that we develop or license.

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Risks Related to Our Common Stock

We previously identified and have remediated a material weakness in our internal control over financial reporting. Any failure to maintain effective internal control over financial reporting could result in our failure to meet our reporting obligations and cause investors to lose confidence in our reported financial information, which in turn could cause the trading price of our common stock to decline.

Pursuant to Section 404 of the Sarbanes-Oxley Act of 2002 and related rules, our management was required to report upon the effectiveness of our internal control over financial reporting in our Annual Report on Form 10-K for the fiscal year ended December 31, 2013. When and if we are no longer an ‘‘emerging growth company,’’ as defined in the Securities Exchange Act of 1934, as amended (the Exchange Act), our independent registered public accounting firm will also be required to attest to the effectiveness of our internal control over financial reporting. However, for so long as we remain an emerging growth company, we intend to take advantage of certain exemptions from various reporting requirements that are applicable to public companies that are not emerging growth companies, including, but not limited to, not being required to comply with the auditor attestation requirements of Section 404. Once we are no longer an emerging growth company or, if prior to such date, we opt to no longer take advantage of the applicable exemption, we will be required to include an opinion from our independent registered public accounting firm on the effectiveness of our internal controls over financial reporting.

Although we have determined that our internal control over financial reporting was effective as of December 31, 2013, as indicated in our Management Report on Internal Control over Financial Reporting, included in our Annual Report on Form 10-K for the fiscal year ended December 31, 2013, we must continue to monitor and assess our internal control over financial reporting. If our management identifies one or more material weaknesses in our internal control over financial reporting in the future and such weakness remains uncorrected at fiscal year-end, we will be unable to assert such internal control is effective at fiscal year-end. If we are unable to assert that our internal control over financial reporting is effective at fiscal year-end (or if our independent registered public accounting firm concludes that we have a material weakness in our internal controls or, after we are no longer an emerging growth company, is unable to express an opinion on the effectiveness of our internal controls), we could lose investor confidence in the accuracy and completeness of our financial reports, which would likely have an adverse effect on our business and stock price.

Our stock price is volatile and purchasers of our common stock could incur substantial losses.

Our stock price is volatile and from January 31, 2013, the first day of trading of our common stock, to May 6, 2014, our stock had high and low sales prices in the range of $8.25 to $2.09 per share. The market price of our common stock may fluctuate significantly in response to a number of factors. These factors include those discussed in this ‘‘Risk Factors’’ section of this report and others such as:

· delay or failure in initiating or completing preclinical studies or clinical trials, or unsatisfactory results of these trials and the resulting impact on ongoing product development;

· announcements about us or about our competitors including clinical trial results, regulatory approvals, or new product candidate introductions;

· developments concerning our development partner, licensors or product candidate manufacturers;

· litigation and other developments relating to our patents or other proprietary rights or those of our competitors;

· conditions in the pharmaceutical or biotechnology industries and the economy as a whole;

· governmental regulation and legislation;

· recruitment or departure of members of our board of directors, management team or other key personnel;

· changes in our operating results;

· any financial projections we may provide to the public, any changes in these projections, our failure to meet these projections, or changes in recommendations by any securities analysts that elect to follow our common stock;

· change in securities analysts’ estimates of our performance, or our failure to meet analysts’ expectations;

· the expiration of market standoff or contractual lock-up agreements;

· announcements regarding equity or debt financing transactions;

· sales or potential sales of substantial amounts of our common stock; and

· price and volume fluctuations in the overall stock market or resulting from inconsistent trading volume levels of our shares.

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In recent years, the stock market in general, and the market for pharmaceutical and biotechnological companies in particular, has experienced extreme price and volume fluctuations that have often been unrelated or disproportionate to changes in the operating performance of the companies whose stock is experiencing those price and volume fluctuations. Broad market and industry factors may seriously affect the market price of our common stock, regardless of our actual operating performance. These fluctuations may be even more pronounced in the trading market for our stock shortly following our initial public offering.

Raising additional funds by issuing securities or through licensing or lending arrangements may cause dilution to our existing stockholders, restrict our operations or require us to relinquish proprietary rights.

To the extent that we raise additional capital by issuing equity securities, the share ownership of existing stockholders will be diluted. For example, on September 3, 2013 we entered into an At-the-Market Issuance Sales Agreement with MLV & Co. LLC (MLV) under which, subject to certain conditions, we may offer and sell shares of our common stock having an aggregate offering price of up to $50,000,000 from time to time through MLV, acting as agent. To the extent that additional capital is raised through the sale of equity or convertible debt securities, the issuance could result in further dilution to our stockholders.

Any future debt financing may involve covenants that restrict our operations, including, among other restrictions, limitations on our ability to incur liens or additional debt, pay dividends, redeem our stock, make certain investments, and engage in certain merger, consolidation, or asset sale transactions. In addition, if we raise additional funds through licensing arrangements, it may be necessary to grant potentially valuable rights to our product candidates or grant licenses on terms that are not favorable to us.

An active trading market for our common stock may not develop or be sustained or may be volatile.

Our initial public offering was completed in February 2013, and we subsequently completed a secondary public offering of additional common shares later in 2013. Nevertheless, we continue to have a limited number of shares publicly available for purchase. An active trading market may not develop or, if developed, may not be sustained. The lack of an active market may impair your ability to sell your shares at the time you wish to sell them or at a price that you consider reasonable. The lack of an active market may also reduce the fair market value of your shares. An inactive market may also impair our ability to raise capital to continue to fund operations by selling shares and may impair our ability to acquire other companies or technologies by using our shares as consideration. In addition, the public market for our shares may be extremely volatile in light of the results of our operations, our limited resources, the number of products we may have in development at any given time, and numerous other factors.

Substantial future sales of shares by existing stockholders, or the perception that such sales may occur, could cause our stock price to decline.

If our existing stockholders, particularly our directors and executive officers and the venture capital funds affiliated with our current and former directors, sell substantial amounts of our common stock in the public market, or are perceived by the public market as intending to sell substantial amounts of our common stock, the trading price of our common stock could decline significantly. As of March 31, 2014, we had 32,981,396 shares of common stock outstanding. On July 31, 2013, 14,697,573 shares that were previously subject to contractual lock-up agreements entered into by certain of our stockholders with the underwriters in connection with our initial public offering became freely tradable, except for shares of common stock held by directors, executive officers and our other affiliates, which are subject to volume limitations under Rule 144 of the Securities Act of 1933, as amended. As of December 25, 2013, approximately 5,409,636 shares that were previously subject to contractual lock-up agreements entered into by certain of our stockholders with the underwriters in connection with our follow-on public offering became freely tradable, except for shares of common stock held by directors, executive officers and our other affiliates, which are subject to volume and other limitations under Rule 144 under the Securities Act.

Certain holders or our common stock have rights, subject to some conditions, to require us to file registration statements covering their shares or to include their shares in registration statements that we may file for our stockholders or ourselves. These shares will be able to be sold freely in the public market upon issuance.

We have also registered 4,325,912 shares of our common stock that we may issue under our equity plans. Once we issue these shares, they can be freely sold in the public market upon issuance, subject to any vesting restriction or Rule 144 transfer restrictions applicable to affiliates.

If securities analysts do not publish research or publish unfavorable research about our business, our stock price and trading volume could decline.

The trading market for our common stock will depend in part on the research and reports that securities and industry analysts publish about us or our business. If one or more of the analysts who covers us downgrades our stock or publishes unfavorable research about our business, or if our clinical trials or operating results fail to meet the analysts’ expectations, as recently occurred with respect to KB003 and our Phase 2 study results, our stock price would likely decline. If one or more of these analysts ceases coverage of our company or fails to publish reports on us regularly, demand for our stock could decrease, which could cause our stock price and trading volume to decline.

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Requirements associated with being a public reporting company will continue to increase our costs significantly, as well as divert significant company resources and management attention.

We have only been subject to the reporting requirements of the Exchange Act and the other rules and regulations of the Securities and Exchange Commission (SEC) since August 2012. We are working with our legal, independent accounting, and financial advisors to identify those areas in which changes should be made to our financial and management control systems to manage our growth and our obligations as a public reporting company. These areas include corporate governance, corporate control, disclosure controls and procedures, and financial reporting and accounting systems. We have made, and will continue to make, changes in these and other areas. Compliance with the various reporting and other requirements applicable to public reporting companies will require considerable time, attention of management, and financial resources. In addition, the changes we make may not be sufficient to allow us to satisfy our obligations as a public reporting company on a timely basis.

Further, the listing requirements of The NASDAQ Global Market require that we satisfy certain corporate governance requirements relating to director independence, distributing annual and interim reports, stockholder meetings, approvals and voting, soliciting proxies, conflicts of interest and a code of conduct. Our management and other personnel will need to devote a substantial amount of time to ensure that we comply with all of these requirements. Moreover, the reporting requirements, rules and regulations will increase our legal and financial compliance costs and will make some activities more time-consuming and costly. These reporting requirements, rules and regulations, coupled with the increase in potential litigation exposure associated with being a public company, could also make it more difficult for us to attract and retain qualified persons to serve on our board of directors or board committees or to serve as executive officers, or to obtain certain types of insurance, including directors’ and officers’ insurance, on acceptable terms.

In addition, being a public company could make it more difficult or more costly for us to obtain certain types of insurance, including directors’ and officers’ liability insurance, and we may be forced to accept reduced policy limits and coverage or incur substantially higher costs to obtain the same or similar coverage. The impact of these events could also make it more difficult for us to attract and retain qualified persons to serve on our board of directors, our board committees or as executive officers.

Any changes we make to comply with these obligations may not be sufficient to allow us to satisfy our obligations as a public company on a timely basis, or at all.

We have never paid and do not intend to pay cash dividends and, consequently, your ability to achieve a return on your investment in our common stock will depend on appreciation in the price of our common stock.

We have never paid cash dividends on any of our capital stock, and we currently intend to retain future earnings, if any, to fund the development and growth of our business. Additionally, our loan and security agreement with MidCap Financial contains covenants that restrict our ability to pay dividends. Therefore, you are not likely to receive any dividends on our common stock for the foreseeable future. Since we do not intend to pay dividends, your ability to receive a return on an investment in our common stock will depend on any future appreciation in the market value of our common stock. There is no guarantee that our common stock will appreciate or even maintain the price at which you purchased it.

Our principal stockholders and management own a significant percentage of our stock and will be able to exert significant control over matters subject to stockholder approval.

Our directors, executive officers, and the holders of more than 5% of our common stock together with their affiliates beneficially own approximately 57% of our common stock as of March 31, 2014. These stockholders, acting together, may be able to determine all matters requiring stockholder approval. For example, these stockholders may be able to control elections of directors, amendments of our organizational documents, or approval of any merger, sale of assets, or other major corporate transaction. This may prevent or discourage unsolicited acquisition proposals or offers for our common stock that you may feel are in your best interest as one of our stockholders.

As a public company, our stock price has been volatile, and securities class action litigation has often been instituted against companies following periods of volatility of their stock price. Any such litigation, if instituted against us, could result in substantial costs and a diversion of our management’s attention and resources.

In the past, following periods of volatility in the overall market and the market price of a particular company’s securities, securities class action litigation has sometimes been instituted against these companies. This litigation, if instituted against us, could result in substantial costs and a diversion of our management’s attention and resources.

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Anti-takeover provisions in our development agreement with Sanofi, as well as in our charter documents and Delaware law, could discourage, delay, or prevent a change in control of our company and may affect the trading price of our common stock.

Under our license and collaboration agreement with Sanofi, in the event we are acquired by a top 25 pharmaceutical company based on market capitalization at the time of such acquisition, Sanofi has the option to exclusively develop and commercialize licensed products to treat Pa-infected patients with CF or bronchiectasis patients worldwide, which would limit the amount of revenue we could generate from the commercialization of those licensed products to the amounts Sanofi would be required to pay pursuant to their agreement with us. In addition, our agreement with Sanofi prohibits us or an acquiror of us from developing or commercializing any other anti-Pa antibody except with respect to any anti-Pa antibody of the acquiror existing on the date of acquisition and developed thereafter. Accordingly, these provisions may discourage or prevent certain pharmaceutical companies from seeking to acquire us.

In addition, we are a Delaware corporation and the anti-takeover provisions of the Delaware General Corporation Law may discourage, delay, or prevent a change in control by prohibiting us from engaging in a business combination with an interested stockholder for a period of three years after the person becomes an interested stockholder, even if a change in control would be beneficial to our existing stockholders.

Our amended and restated certificate of incorporation and amended and restated bylaws may discourage, delay, or prevent a change in our management or control over us that stockholders may consider favorable. Our amended and restated certificate of incorporation and amended and restated bylaws:

· provide that vacancies on our board of directors, including newly created directorships, may be filled only by a majority vote of directors then in office;

· do not provide stockholders with the ability to cumulate their votes; and

· require advance notification of stockholder nominations and proposals.

We are an emerging growth company and the extended transition period for complying with new or revised financial accounting standards and reduced disclosure and governance requirements applicable to emerging growth companies could make our common stock less attractive to investors.

We are an emerging growth company. Under the JOBS Act, emerging growth companies can delay adopting new or revised accounting standards until such time as those standards apply to private companies. We plan to avail ourselves of this exemption from new or revised accounting standards and, therefore, we may not be subject to the same new or revised accounting standards as other public companies that are not emerging growth companies.

For as long as we continue to be an emerging growth company, we also intend to take advantage of certain other exemptions from various reporting requirements that are applicable to other public companies including, but not limited to, reduced disclosure obligations regarding executive compensation in our periodic reports and proxy statements, exemptions from the requirements of holding a nonbinding advisory stockholder vote on executive compensation and any golden parachute payments not previously approved, exemption from the requirement of auditor attestation in the assessment of our internal control over financial reporting and exemption from any requirement that may be adopted by the Public Company Accounting Oversight Board regarding mandatory audit firm rotation or a supplement to the auditor’s report providing additional information about the audit and the financial statements (auditor discussion and analysis). If we do, the information that we provide stockholders may be different than what is available with respect to other public companies.

Investors could find our common stock less attractive because we will rely on these exemptions, which may make it more difficult for investors to compare our business with other companies in our industry. If some investors find our common stock less attractive as a result, there may be a less active trading market for our common stock and our stock price may be more volatile. In addition, it may be difficult for us to raise additional capital as and when we need it. If we are unable to do so, our financial condition and results of operations could be materially and adversely affected.

We will remain an emerging growth company until the earliest of (i) the end of the fiscal year in which the market value of our common stock that is held by non-affiliates exceeds $700 million as of the end of the second fiscal quarter, (ii) the end of the fiscal year in which we have total annual gross revenue of $1 billion or more during such fiscal year, (iii) the date on which we issue more than $1 billion in non-convertible debt in a three—year period or (iv) December 31, 2017, the end of the fiscal year following the fifth anniversary of the first sale of our common equity securities pursuant to an effective registration statement filed under the Securities Act.

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EXHIBIT INDEX

Exhibit No.		Description

3.1(1)		Amended and Restated Certificate of Incorporation of the Registrant.

3.2(1)		Amended and Restated Bylaws of the Registrant.

4.1		Reference is made to Exhibits 3.1 and 3.2.

4.2(2)		Warrant to Purchase Stock, by and between KaloBios Pharmceuticals, Inc. and MidCap Financial SBIC, LP, dated as of September 5, 2012.

10.1(2)		Loan and Security Agreement, by and between KaloBios Pharmaceuticals, Inc. and MidCap Financial SBIC, LP, dated as of September 5, 2012.

10.2(3)		Amendment No. 1 to Loan and Security Agreement, by and between KaloBios Pharmaceuticals, Inc. and MidCap Financial SBIC, LP, dated as of June 19, 2013.

10.3*		Amended and Restated Employment Agreement, dated April 28, 2014, by and between the Registrant and David W. Pritchard.

10.4*		Amended and Restated Employment Agreement, dated April 28, 2014, by and between the Registrant and Herb C. Cross.

10.5*		Amended and Restated Employment Agreement, dated April 28, 2014, by and between the Registrant and Donald R. Joseph.

10.6*		Amended and Restated Employment Agreement, dated April 28, 2014, by and between the Registrant and Geoffrey T. Yarranton.

10.7*		Employment Agreement, dated April 28, 2014, by and between the Registrant and Nestor A. Molfino.

10.8		Amendment to License Agreement, dated October 9, 2008, by and between the Registrant and the Ludwig Institute for Cancer Research

10.9		Amendment to License Agreement, dated June 8, 2011, by and between the Registrant and the Ludwig Institute for Cancer Research

31.1		Certification of Chief Executive Officer of the Registrant, as required by Rule 13a-14(a) or Rule 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

31.2		Certification of Chief Financial Officer of the Registrant, as required by Rule 13a-14(a) or Rule 15d-14(a) of the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.

32.1**		Certification by the Chief Executive Officer, as required by Rule 13a-14(b) or Rule 15d-14(b) and Section 1350 of Chapter 36 of Title 18 of the United States Code (18 U.S.C. §1350).

32.2**		Certification by the Chief Financial Officer, as required by Rule 13a-14(b) or Rule 15d-14(b) and Section 1350 of Chapter 36 of Title 18 of the United States Code (18 U.S.C. §1350).

101.INS***		XBRL Instance Document

101.SCH***		XBRL Taxonomy Extension Schema Document

101.CAL***		XBRL Taxonomy Extension Calculation Linkbase Document

101.DEF***		XBRL Taxonomy Extension Definition Linkbase Document

101.LAB***		XBRL Taxonomy Extension Label Linkbase Document

101.PRE***		XBRL Taxonomy Extension Presentation Linkbase Document

(1)		Filed as an exhibit to Registrant’s Registration Statement on Form S-1 (File No. 333-184299) filed on January 15, 2013 and incorporated herein by reference.
(2)		Filed as an exhibit to Registrant’s Current Report on Form 8-K (File No. 000-54735) filed on September 7, 2012.
(3)		Filed as an exhibit to Registrant’s Current Report on Form 8-K (File No. 001-35798) filed on June 24, 2013.

	KALOBIOS PHARMACEUTICALS, INC.

Date: May 7, 2014	By:	/s/ David W. Pritchard
		David W. Pritchard
		President and Chief Executive Officer (Principal Executive Officer)

Date: May 7, 2014	By:	/s/ Herb C. Cross
		Herb C. Cross
		Chief Financial Officer (Principal Financial Officer)

			Page

PART I. FINANCIAL INFORMATION			3

	Item 1.	Financial Statements (unaudited)	3

		Condensed Consolidated Balance Sheets as of March 31, 2014 and December 31, 2013	3

		Condensed Consolidated Statements of Comprehensive Loss for the Three Months Ended March 31, 2014 and 2013	4

		Condensed Consolidated Statements of Cash Flows for the Three Months Ended March 31, 2014 and 2013	5

		Notes to Condensed Consolidated Financial Statements	6

	Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	13

	Item 3.	Quantitative and Qualitative Disclosures About Market Risk	18

	Item 4.	Controls and Procedures	18

PART II. OTHER INFORMATION			19

	Item 1.	Legal Proceedings	19

	Item 1A.	Risk Factors	19

	Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	42

	Item 3.	Defaults Upon Senior Securities	42

	Item 4.	Mine Safety Disclosures	42

	Item 5.	Other Information	42

	Item 6.	Exhibits	42

SIGNATURES			43