Document:

Employment Offer Letter

 Exhibit 10.18 
 KALOBIOS PHARMACEUTICALS, INC. 
 3427 HILLVIEW AVENUE 
 PALO
ALTO, CA 94304 
 August 15, 2006 
 David Pritchard 
  
 Dear
David: 
 KaloBios Pharmaceuticals, Inc. (the “Company”) is pleased to offer you employment on the following terms:

 1. Position. Your initial title will be Chief Executive Officer, and you will initially report to the Chairman of the
Company’s Board of Directors. This is a full-time position. While you render services to the Company, you will not engage in any other employment, consulting or other business activity (whether full-time or part-time) that would create a
conflict of interest with the Company. By signing this letter agreement, you confirm to the Company that you have no contractual commitments or other legal obligations that would prohibit you from performing your duties for the Company. 

2. Cash Compensation. The Company will pay you a starting salary at the rate of $300,000 per year, payable in accordance with the
Company’s standard payroll schedule. This salary will be subject to adjustment pursuant to the Company’s employee compensation policies in effect from time to time. In addition, you will be eligible to be considered for an incentive bonus
for each fiscal year of the Company. The bonus (if any) will be awarded based on objective or subjective criteria established by the Compensation Committee of the Company’s Board of Directors, in consultation with you. Any bonus for the fiscal
year in which your employment begins will be prorated, based on the number of days you are employed by the Company during that fiscal year. The bonus for a fiscal year will be paid after the Company’s books for that year have been closed and
will be paid only if you are employed by the Company at the time of payment. The determinations of the Company’s Board of Directors or its Compensation Committee with respect to your bonus will be final and binding. 

3. Employee Benefits. As a regular employee of the Company, you will be eligible to participate in a number of Company-sponsored
benefits, including medical and dental benefits, flexible spending account and 401(k) plan. In addition, you will be entitled to paid vacation in accordance with the Company’s vacation policy, as in effect from time to time. Regular employees
accrue 12 vacation days annually and receive 3 floating holidays annually. Vacation days carry over year to year and accrue to a maximum of 160 hours. Floating holidays do not carry over. 

 David Pritchard 
 August 15, 2006 
  Page
 2
 
  

 4. Stock Options. Subject to the approval of the Company’s Board of
Directors or its Compensation Committee, you will be granted an option to purchase 1,142,578 shares of the Company’s Common Stock (4.5% of fully diluted shares). The exercise price per share will be equal to the fair market value per share, as
determined by the Board of Directors or the Compensation Committee when the option is granted. The option will be subject to the terms and conditions applicable to options granted under the Company’s 2001 Stock Plan (the “Plan”), as
described in the Plan and the applicable Stock Option Agreement. The option will be immediately exercisable, but the unvested portion of the purchased shares will be subject to repurchase by the Company at the exercise price in the event that your
service terminates for any reason before you vest in the shares. You will vest in 25% of the option shares after 12 months of continuous service, and the balance will vest in equal monthly installments over the next 36 months of continuous service,
as described in the applicable Stock Option Agreement. If the Company is subject to a Change in Control (as defined in the Plan) before your service with the Company terminates, and if you are subject to an Involuntary Termination (as defined in
Section 12) within 12 months after that Change in Control, then all of your option shares will vest in full. 
 5.
Severance Benefits upon Change in Control. If the Company is subject to a Change in Control (as defined in the Plan) before your service with the Company terminates, and if you are subject to an Involuntary Termination within 12 months after
that Change in Control, then you will be entitled to the following benefits: 
 (a) The Company will continue to
pay your base salary for a period of 12 months following the termination of your employment. Your base salary will be paid at the rate in effect at the time of the termination of your employment and in accordance with the Company’s standard
payroll procedures. However, your severance payments will in no event start before the earliest date permitted by Section 409A(a)(2) of the Internal Revenue Code. If the commencement of the severance payments must be delayed, as determined by
the Company, then the deferred installments will be paid to you in a lump sum on the earliest practicable date permitted by Section 409A(a)(2). The amount of the salary continuation payments under this Subsection (a) will be reduced by the
amount of any severance pay or pay in lieu of notice that you receive from the Company under a federal or state statute (including, without limitation, the WARN Act). 

(b) If a target bonus has been established for you under Section 2 for the fiscal year in which your employment
terminates, you will receive a pro rata portion of that target bonus, based on the number of days for which you were employed during that fiscal year. This amount will be paid in installments over the same period as your base salary, pursuant
to Subsection (a) above. 
 (c) If you elect to continue your health insurance coverage under the
Consolidated Omnibus Budget Reconciliation Act (“COBRA”) 

 David Pritchard 
 August 15, 2006 
  Page
 3
 
  

 
following the termination of your employment, then the Company will pay the same portion of your monthly premium under COBRA as it pays for active employees until the earliest of (i) the
close of the 12-month period following the termination of your employment, (ii) the expiration of your continuation coverage under COBRA or (iii) the date when you become eligible for substantially equivalent health insurance coverage in
connection with new employment or self-employment. 
 However, this Section 5 will not apply unless you (i) resign as a member of the
Boards of Directors of the Company and all of its subsidiaries, to the extent applicable, (ii) sign a general release of claims (in a form prescribed by the Company) of all known and unknown claims that you may then have against the Company or
persons affiliated with the Company and (iii) have returned all Company property. 
 6. Proprietary Information and
Inventions Agreement. Like all Company employees, you will be required, as a condition of your employment with the Company, to sign the Company’s standard Proprietary Information and Inventions Agreement, a copy of which is attached hereto
as Exhibit A. 
 7. Employment Relationship. Employment with the Company is for no specific period of time.
Your employment with the Company will be “at will,” meaning that either you or the Company may terminate your employment at any time and for any reason, with or without cause. Any contrary representations that may have been made to you are
superseded by this letter agreement. This is the full and complete agreement between you and the Company on this term. Although your job duties, title, compensation and benefits, as well as the Company’s personnel policies and procedures, may
change from time to time, the “at will” nature of your employment may only be changed in an express written agreement signed by you and a duly authorized officer of the Company (other than you). 

8. Consultancy. Prior to September 25, 2006, you will work with the management team on a consultancy basis. Terms and
conditions for this consultancy should be mutually agreed. 
 9. Taxes. All forms of compensation referred to in this
letter agreement are subject to reduction to reflect applicable withholding and payroll taxes and other deductions required by law. You agree that the Company does not have a duty to design its compensation policies in a manner that minimizes your
tax liabilities, and you will not make any claim against the Company or its Board of Directors related to tax liabilities arising from your compensation. 
 10. Interpretation, Amendment and Enforcement. This letter agreement and Exhibit A constitute the complete agreement between you and the Company, contain all of the terms of your employment
with the Company and supersede any prior agreements, representations or understandings (whether written, oral or implied) between you and the Company. This letter agreement may not be amended or modified, except by an express written agreement
signed by both you and a duly authorized officer of the Company. The terms of this 

 David Pritchard 
 August 15, 2006 
  Page
 4
 
  

 
letter agreement and the resolution of any disputes as to the meaning, effect, performance or validity of this letter agreement or arising out of, related to, or in any way connected with, this
letter agreement, your employment with the Company or any other relationship between you and the Company (the “Disputes”) will be governed by California law, excluding laws relating to conflicts or choice of law. You and the Company submit
to the exclusive personal jurisdiction of the federal and state courts located in Santa Clara County in connection with any Dispute or any claim related to any Dispute. 
 11. Arbitration. Any controversy or claim arising out of this letter agreement and any and all claims relating to your employment with the Company will be settled by final and binding arbitration.
The arbitration will take place in Santa Clara County or, at your option, the County in which you primarily worked when the arbitrable dispute or claim first arose. The arbitration will be administered by the American Arbitration Association under
its National Rules for the Resolution of Employment Disputes. Any award or finding will be confidential. You and the Company agree to provide one another with reasonable access to documents and witnesses in connection with the resolution of the
dispute. You and the Company will share the costs of arbitration equally, except that the Company will bear the cost of the arbitrator’s fee and any other type of expense or cost that you would not be required to bear if you were to bring the
dispute or claim in court. Each party will be responsible for its own attorneys’ fees, and the arbitrator may not award attorneys’ fees unless a statute or contract at issue specifically authorizes such an award. This Section 11 does
not apply to claims for workers’ compensation benefits or unemployment insurance benefits. Injunctive relief and other provisional remedies will be available in accordance with Section 1281.8 of the California Code of Civil Procedure.

 12. Definitions. The following terms have the meaning set forth below wherever they are used in this letter agreement:

 “Cause” means (a) your unauthorized use or disclosure of the Company’s confidential information or
trade secrets, which use or disclosure causes material harm to the Company, (b) your material breach of any agreement between you and the Company, (c) your material failure to comply with the Company’s written policies or rules,
(d) your conviction of, or your plea of “guilty” or “no contest” to, a felony under the laws of the United States or any State, (e) your gross negligence or willful misconduct, (f) your continuing failure to
perform assigned duties after receiving written notification of the failure from the Company’s Board of Directors or (g) your failure to cooperate in good faith with a governmental or internal investigation of the Company or its directors,
officers or employees, if the Company has requested your cooperation. 
 “Involuntary Termination” means either
(a) involuntary discharge by the Company for reasons other than Cause or (b) voluntary resignation following (i) a change in your position with the Company that materially reduces your level of authority or responsibility, (ii) a
reduction in your base salary by more than 10% or (iii) receipt of notice that your principal workplace will be relocated more than 30 miles. 

 David Pritchard 
 August 15, 2006 
  Page
 5
 
  

 “Permanent Disability” means that you are unable to perform the
essential functions of your position, with or without reasonable accommodation, for a period of at least 120 consecutive days because of a physical or mental impairment. 
 * * * * * 
 We hope that you will accept our offer to join the Company. You may
indicate your agreement with these terms and accept this offer by signing and dating both the enclosed duplicate original of this letter agreement and the enclosed Proprietary Information and Inventions Agreement and returning them to me. This
offer, if not accepted, will expire at the close of business on August 28, 2006. As required by law, your employment with the Company is contingent upon your providing legal proof of your identity and authorization to work in the United States.
Your employment is also contingent upon your starting work with the Company on or before September 25, 2006. 
 If you have
any questions, please call me at 650-843-1897, x301. 
  

			
	Very truly yours,
	
	KALOBIOS PHARMACEUTICALS, INC.
		
	By:	 	 /s/ Geoffrey T. Yarranton

	Title: Chief Executive Officer

 I have read and accept this employment offer: 

 

			
	 /s/ David Pritchard

	Signature of David Pritchard
		
	Dated:	 	  August 16, 2006

 Attachment 
 Exhibit A: Proprietary Information and Inventions Agreement 

 PROPRIETARY INFORMATION AND INVENTIONS AGREEMENT 

The following confirms and memorializes an agreement that KaloBios, Inc., a Delaware corporation (the “Company”), and I (David
Pritchard) have had since the commencement of my employment with the Company in any capacity and that is and has been a material part of the consideration for my employment by Company: 

1. I have not entered into, and I agree I will not enter into, any agreement either written or oral in conflict with this Agreement or my
employment with Company. I will not violate any agreement with or rights of any third party or, except as expressly authorized by Company in writing hereafter, use or disclose my own or any third party’s confidential information or intellectual
property when acting within the scope of my employment or otherwise on behalf of Company. Further, I have not retained anything containing any confidential information of a prior employer or other third party, whether or not created by me.

 2. Company shall own all right, title and interest (including patent rights, copyrights, trade secret rights, mask work
rights, sui generis database rights and all other intellectual and industrial property rights of any sort throughout the world) relating to any and all inventions (whether or not patentable), works of authorship, mask works, designs,
know-how, ideas and information made or conceived or reduced to practice, in whole or in part, by me during the term of my employment with Company to and only to the fullest extent allowed by California Labor Code Section 2870 (which is
attached as Appendix A) (collectively “Inventions”). I will promptly disclose all such Inventions to Company. I hereby make all assignments necessary to accomplish the foregoing. I shall further assist Company, at Company’s
expense, to further evidence, record and perfect such assignments, and to perfect, obtain, maintain, enforce, and defend any rights specified to be so owned or assigned. I hereby irrevocably designate and appoint Company as my agent and
attorney-in-fact, coupled with an interest and with full power of substitution, to act for and in my behalf to execute and file any document and to do all other lawfully permitted acts to further the purposes of the foregoing with the same legal
force and effect as if executed by me. If anything created by me prior to my employment relates in any way to Company’s actual or proposed business, I have listed it on Appendix B in a manner that does not violate any third party rights.
Without limiting Section 1 or Company’s other rights and remedies, if, when acting within the scope of my employment or otherwise on behalf of Company, I use or (except pursuant to this Section 2) disclose my own or any third
party’s confidential information or intellectual property (or if any Invention cannot be fully made, used, reproduced, distributed and otherwise exploited without using or violating the foregoing), Company will have and I hereby grant Company a
perpetual, irrevocable, worldwide royalty-free, non-exclusive, sublicensable right and license to exploit and exercise all such confidential information and intellectual property rights. 

3. To the extent allowed by law, paragraph 2 includes all rights of paternity, integrity, disclosure and withdrawal and any other rights
that may be known as or referred to as “moral rights,” “artist’s rights,” “droit moral,” or the like (collectively “Moral Rights”). To the extent I retain any such Moral Rights under applicable law, I
hereby ratify and consent to any action that may be taken with respect to such Moral Rights by or authorized by Company and agree not to assert any Moral Rights with respect thereto. I will confirm any such ratifications, consents and agreements
from time to time as requested by Company. 

 4. I agree that all Inventions and all other business, technical and financial information
(including, without limitation, the identity of and information relating to customers or employees) I develop, learn or obtain during the term of my employment that relate to Company or the business or demonstrably anticipated business of Company or
that are received by or for Company in confidence, constitute “Proprietary Information.” I will hold in confidence and not disclose or, except within the scope of my employment, use any Proprietary Information. However, I shall not be
obligated under this paragraph with respect to information I can document is or becomes readily publicly available without restriction through no fault of mine. Upon termination of my employment, I will promptly return to Company all items
containing or embodying Proprietary Information (including all copies), except that I may keep my personal copies of (i) my compensation records, (ii) materials distributed to shareholders generally and (iii) this Agreement. I also
recognize and agree that I have no expectation of privacy with respect to Company’s telecommunications, networking or information processing systems (including, without limitation, stored computer files, email messages and voice messages) and
that my activity and any files or messages on or using any of those systems may be monitored at any time without notice. 
 5.
Until one year after the term of my employment, I will not encourage or solicit any employee or consultant of Company to leave Company for any reason (except for the bona fide firing of Company personnel within the scope of my employment).

 6. I agree that during the term of my employment with Company (whether or not during business hours), I will not engage in
any activity that is in any way competitive with the business or demonstrably anticipated business of Company, and I will not assist any other person or organization in competing or in preparing to compete with any business or demonstrably
anticipated business of Company. 
 7. I agree that this Agreement is not an employment contract for any particular term and
that I have the right to resign and Company has the right to terminate my employment at will, at any time, for any or no reason, with or without cause. In addition, this Agreement does not purport to set forth all of the terms and conditions of my
employment, and, as an employee of Company, I have obligations to Company which are not set forth in this Agreement. However, the terms of this Agreement govern over any inconsistent terms and can only be changed by a subsequent written agreement
signed by the Chairman of the Board of Company. 
 8. I agree that my obligations under paragraphs 2, 3, 4 and 5 of this
Agreement shall continue in effect after termination of my employment, regardless of the reason or reasons for termination, and whether such termination is voluntary or involuntary on my part, and that Company is entitled to communicate my
obligations under this Agreement to any future employer or potential employer of mine. My obligations under paragraphs 2, 3 and 4 also shall be binding upon my heirs, executors, assigns, and administrators and shall inure to the benefit of Company,
it subsidiaries, successors and assigns. 

  
 2 

 9. Any dispute in the meaning, effect or validity of this Agreement shall be resolved in
accordance with the laws of the State of California without regard to the conflict of laws provisions thereof. I further agree that if one or more provisions of this Agreement are held to be illegal or unenforceable under applicable California law,
such illegal or unenforceable portion(s) shall be limited or excluded from this Agreement to the minimum extent required so that this Agreement shall otherwise remain in full force and effect and enforceable in accordance with its terms. I also
understand that any breach of this Agreement will cause irreparable harm to Company for which damages would not be a adequate remedy, and, therefore, Company will be entitled to injunctive relief with respect thereto in addition to any other
remedies and without any requirement to post bond. 
 I HAVE READ THIS AGREEMENT CAREFULLY AND I UNDERSTAND AND ACCEPT THE
OBLIGATIONS WHICH IT IMPOSES UPON ME WITHOUT RESERVATION. NO PROMISES OR REPRESENTATIONS HAVE BEEN MADE TO ME TO INDUCE ME TO SIGN THIS AGREEMENT. I SIGN THIS AGREEMENT VOLUNTARILY AND FREELY, IN DUPLICATE, WITH THE UNDERSTANDING THAT THE COMPANY
WILL RETAIN ONE COUNTERPART AND THE OTHER COUNTERPART WILL BE RETAINED BY ME. 
  

			
	September 20, 2006	 	Employee Signature
		
		 	 /s/ David Pritchard

		 	David Pritchard

 Accepted and Agreed to: 
  

			
	KaloBios Pharmaceuticals, Inc.
		
	 By
	 	 /s/ Geoffrey T. Yarranton

  
 3 

 APPENDIX A 
 California Labor Code Section 2870. Application of provision providing that employee shall assign or offer to assign rights in invention to employer. 

(a) Any provision in an employment agreement which provides that an employee shall assign, or offer to assign, any of his or her rights
in an invention to his or her employer shall not apply to an invention that the employee developed entirely on his or her own time without using the employer’s equipment, supplies, facilities, or trade secret information except for those
inventions that either: 
 (i) Relate at the time of conception or reduction to practice of the invention to the
employer’s business, or actual or demonstrably anticipated research or development of the employer; or 
 (ii) Result from
any work performed by the employee for his employer. 
 (b) To the extent a provision in an employment agreement purports to
require an employee to assign an invention otherwise excluded from being required to be assigned under subdivision (a), the provision is against the public policy of this state and is unenforceable. 

 APPENDIX B 
 PRIOR MATTEREmployment Offer Letter

 Exhibit 10.19 
 February 1, 2011 
 Dr. Jonathan Leff, M.D. 

 
  
 Dear
Jonathan: 
 KaloBios Pharmaceuticals, Inc. (the “Company”) is pleased to offer you employment on the following terms:

 1. Position. Your initial title will be Chief Medical Officer, and you will report to the Company’s Chief
Executive Officer. This is a full-time position based in South San Francisco, California. By signing this letter agreement, you confirm to the Company that you have no contractual commitments or other legal obligations that would prohibit you from
performing your duties for the Company. 
 2. Base Salary. The Company will pay you a starting base salary at the rate of
$350,000.00 per year, payable in accordance with the Company’s standard payroll schedule. This salary will be subject to adjustment pursuant to the Company’s employee compensation policies in effect from time to time. 

3. Annual Bonus. In addition, you will be eligible to be considered for an incentive bonus for the 2011 fiscal year of the
Company, subject to the terms and conditions of the Company’s 2011 Bonus Plan (the “Bonus Plan”). The bonus (if any) will be awarded based on the achievement of Company and individual criteria established by the Company. Your maximum
bonus (if any) will be equal to 30% of your annual base salary. At the discretion of the Company’s Board of Directors, the bonus is payable in cash or shares of the Company’s stock (with the value of any such shares to be determined
by the Company’s Board of Directors). For the 2011 fiscal year, your maximum bonus (if any) will be payable in 55,000 shares of the Company’s common stock. The bonus (or vesting determination) for a fiscal year will be paid
after the Company’s books for that year have been closed and will be paid (or vested) only if you are employed by the Company at the time of payment. The determinations of the Company with respect to your bonus will be final and binding. In the
event that there is any conflict between this letter agreement and the Bonus Plan, the Bonus Plan, as interpreted and administered by the Company, will govern. 
 4. Starting Bonus. You will be paid a starting bonus of $20,000, within 10 days after your full time employment in South San Francisco. 

5. Temporary Housing Expenses. You will be paid a bonus in the grossed up range of $4,500 to $6,300 per month through
June 30, 2011, to help you defray the reasonable costs of temporary housing in the San Francisco Bay Area, and travel to and from South San Francisco to San Diego. Temporary housing options will be finalized in the coming weeks. 

 Jonathan Leff, M.D. 
 February 1, 2011 
  Page
 2
 of 4 
  

 6. Relocation Related Expenses. You will be reimbursed up to $10,000.00 to
cover all properly documented expenses related to moving you and your family to your Menlo Park home. These expenses can include all documented expenses related to moving you and your family from San Diego to your family home in Menlo Park, airfare,
mileage and/or shipping costs. If, however, you resign from employment with the Company within the first year of your employment, then you will reimburse the Company for 100% of the amounts paid to you by the Company related to Sections 4 and 6.
Your reimbursement will be made within thirty (30) days following your last date of employment with the Company. 
 7.
Employee Benefits. As a regular employee of the Company, you will be eligible to participate in a number of Company-sponsored benefits, including medical and dental benefits, flexible spending account and 401(k) plan. In addition, you will be
entitled to paid vacation in accordance with the Company’s vacation policy as in effect from time to time. 
 8. Stock
Options. Subject to the approval of the Company’s Board of Directors or its Compensation Committee, you will be granted an option to purchase 500,000 shares of the Company’s Common Stock. The exercise price per share will be
determined by the Company’s Board of Directors or its Compensation Committee on the date of option grant. The option will be subject to the terms and conditions applicable to options granted under the Company’s 2001 Stock Plan (the
“Plan”), as described in the Plan and the applicable Stock Option Agreement. The option will be immediately exercisable, but the unvested portion of the purchased shares will be subject to repurchase by the Company at the exercise price in
the event that your service terminates for any reason before you vest in the shares. You will vest in 25% of the options shares upon your completion of twelve (12) continuous months of service, and the balance will vest in equal monthly
installments over the next 36 months of continuous service, as described in the applicable Stock Option Agreement. 
 9.
Proprietary Information and Inventions Agreement. Like all Company employees, you will be required, as a condition of your employment with the Company, to sign the Company’s standard Proprietary Information and Inventions Agreement, a
copy of which is attached hereto as Exhibit A. 
 10. Employment Relationship. Employment with the Company is
for no specific period of time. Your employment with the Company will be “at will,” meaning that either you or the Company may terminate your employment at any time and for any reason, with or without cause. Any contrary representations
that may have been made to you are superseded by this letter agreement. This is the full and complete agreement between you and the Company on this term. Although your job duties, title, compensation and benefits, as well as the Company’s
personnel policies and procedures, may change from time to time, the “at will” nature of your employment may only be changed in an express written agreement signed by you and a duly authorized officer of the Company (other than you).

 Jonathan Leff, M.D. 
 February 1, 2011 
  Page
 3
 of 4 
  

 11. Outside Activities. While you render services to the Company, you agree that
you will not engage in any other employment, consulting or other business activity without the prior written consent of the Company. While you render services to the Company, you also will not assist any person or entity in competing with the
Company, in preparing to compete with the Company or in hiring any employees or consultants of the Company. 
 12. Taxes.
All forms of compensation referred to in this letter agreement are subject to reduction to reflect all applicable federal and state income and employment withholding taxes and other deductions required by law. You agree that the Company does not
have a duty to design its compensation policies in a manner that minimizes your tax liabilities, and you will not make any claim against the Company or its Board of Directors related to tax liabilities arising from your compensation. 

13. Interpretation, Amendment and Enforcement. This letter agreement and Exhibit A constitute the complete agreement between
you and the Company, contain all of the terms of your employment with the Company and supersede any prior agreements, representations or understandings (whether written, oral or implied) between you and the Company. This letter agreement may not be
amended or modified, except by an express written agreement signed by both you and a duly authorized officer of the Company. The terms of this letter agreement and the resolution of any disputes as to the meaning, effect, performance or validity of
this letter agreement or arising out of, related to, or in any way connected with, this letter agreement, your employment with the Company or any other relationship between you and the Company (the “Disputes”) will be governed by
California law, excluding laws relating to conflicts or choice of law. You and the Company submit to the exclusive personal jurisdiction of the federal and state courts located in San Mateo County in connection with any Dispute or any claim related
to any Dispute. 
 14. Arbitration. Any controversy or claim arising out of this letter agreement and any and all claims
relating to your employment with the Company will be settled by final and binding arbitration. The arbitration will take place in Santa Clara County or, at your option, the County in which you primarily worked when the arbitrable dispute or claim
first arose. The arbitration will be administered by the American Arbitration Association under its National Rules for the Resolution of Employment Disputes. Any award or finding will be confidential. You and the Company agree to provide one another
with reasonable access to documents and witnesses in connection with the resolution of the dispute. You and the Company will share the costs of arbitration equally, except that the Company will bear the cost of the arbitrator’s fee and any
other type of expense or cost that you would not be required to bear if you were to bring the dispute or claim in court. Each party will be responsible for its own attorneys’ fees, and the arbitrator may not award attorneys’ fees unless a
statute or contract at issue specifically authorizes such an award. This Section 14 does not apply to claims for workers’ compensation benefits or unemployment insurance benefits. Injunctive relief and other provisional remedies will be
available in accordance with Section 1281.8 of the California Code of Civil Procedure. 
 ****** 

 Jonathan Leff, M.D. 
 February 1, 2011 
  Page
 4
 of 4 
  

 We hope that you will accept our offer to join the Company. You may indicate your
agreement with these terms and accept this offer by signing and dating both the enclosed duplicate original of this letter agreement and the enclosed Proprietary Information and Inventions Agreement and returning them to me. This offer, if not
accepted, will expire at the close of business on Friday, 2/4/2011. As required by law, your employment with the Company is contingent upon your providing legal proof of your identity and authorization to work in the United States. Your
employment is also contingent upon your starting work with the Company on or before Tuesday, February 15, 2011. 

If you have any questions, please call me at 650-243-3101. 

 

			
	Very truly yours,
	
	KALOBIOS PHARMACEUTICALS, INC.
		
	By:	 	 /s/ David Pritchard

	Title:	 	CEO

 I have read and accept this employment offer: 

 

			
	
	 /s/ Jonathan Leff

	Signature of Jonathan Leff, M.D.
		
	Dated:	 	 2/4/11

 Attachment 
 Exhibit A: Proprietary Information and Inventions Agreement 

 PROPRIETARY INFORMATION AND INVENTIONS AGREEMENT 

The following confirms and memorializes an agreement that KaloBios Pharmaceuticals, Inc., a Delaware corporation (the
“Company”) and I (Dr. Jonathan Leff, M.D.) have had since the commencement of my employment with the Company in any capacity and that is and has been a material part of the consideration for my employment by Company: 

1. I have not entered into, and I agree I will not enter into, any agreement either written or oral in conflict with this Agreement or my
employment with Company. I will not violate any agreement with or rights of any third party or, except as expressly authorized by Company in writing hereafter, use or disclose my own or any third party’s confidential information or intellectual
property when acting within the scope of my employment or otherwise on behalf of Company. Further, I have not retained anything containing any confidential information of a prior employer or other third party, whether or not created by me.

 2. Company shall own all right, title and interest (including patent rights, copyrights, trade secret rights, mask work
rights, sui generis database rights and all other intellectual and industrial property rights of any sort throughout the world) relating to any and all inventions (whether or not patentable), works of authorship, mask works, designs,
know-how, ideas and information made or conceived or reduced to practice, in whole or in part, by me during the term of my employment with Company to and only to the fullest extent allowed by California Labor Code Section 2870 (which is
attached as Appendix A) (collectively “Inventions”). I will promptly disclose all such Inventions to Company. I hereby make all assignments necessary to accomplish the foregoing. I shall further assist Company, at Company’s
expense, to further evidence, record and perfect such assignments, and to perfect, obtain, maintain, enforce, and defend any rights specified to be so owned or assigned. I hereby irrevocably designate and appoint Company as my agent and
attorney-in-fact, coupled with an interest and with full power of substitution, to act for and in my behalf to execute and file any document and to do all other lawfully permitted acts to further the purposes of the foregoing with the same legal
force and effect as if executed by me. If anything created by me prior to my employment relates in any way to Company’s actual or proposed business, I have listed it on Appendix B in a manner that does not violate any third party rights.
Without limiting Section 1 or Company’s other rights and remedies, if, when acting within the scope of my employment or otherwise on behalf of Company, I use or (except pursuant to this Section 2) disclose my own or any third
party’s confidential information or intellectual property (or if any Invention cannot be fully made, used, reproduced, distributed and otherwise exploited without using or violating the foregoing), Company will have and I hereby grant Company a
perpetual, irrevocable, worldwide royalty-free, non-exclusive, sublicensable right and license to exploit and exercise all such confidential information and intellectual property rights. 

3. To the extent allowed by law, paragraph 2 includes all rights of paternity, integrity, disclosure and withdrawal and any other rights
that may be known as or referred to as “moral rights,” “artist’s rights,” “droit moral,” or the like (collectively “Moral Rights”). To the extent I retain any such Moral Rights under applicable law, I
hereby ratify and consent to any action that may be taken with respect to such Moral Rights by or authorized by Company and agree not to assert any Moral Rights with respect thereto. I will confirm any such ratifications, consents and agreements
from time to time as requested by Company. 

 4. I agree that all Inventions and all other business, technical and financial information
(including, without limitation, the identity of and information relating to customers or employees) I develop, learn or obtain during the term of my employment that relate to Company or the business or demonstrably anticipated business of Company or
that are received by or for Company in confidence, constitute “Proprietary Information.” I will hold in confidence and not disclose or, except within the scope of my employment, use any Proprietary Information. However, I shall not be
obligated under this paragraph with respect to information I can document is or becomes readily publicly available without restriction through no fault of mine. Upon termination of my employment, I will promptly return to Company all items
containing or embodying Proprietary Information (including all copies), except that I may keep my personal copies of (i) my compensation records, (ii) materials distributed to shareholders generally and (iii) this Agreement. I also
recognize and agree that I have no expectation of privacy with respect to Company’s telecommunications, networking or information processing systems (including, without limitation, stored computer files, email messages and voice messages) and
that my activity and any files or messages on or using any of those systems may be monitored at any time without notice. 
 5.
Until one year after the term of my employment, I will not encourage or solicit any employee or consultant of Company to leave Company for any reason (except for the bona fide firing of Company personnel within the scope of my employment).

 6. I agree that during the term of my employment with Company (whether or not during business hours), I will not engage in
any activity that is in any way competitive with the business or demonstrably anticipated business of Company, and I will not assist any other person or organization in competing or in preparing to compete with any business or demonstrably
anticipated business of Company. 
 7. I agree that this Agreement is not an employment contract for any particular term and
that I have the right to resign and Company has the right to terminate my employment at will, at any time, for any or no reason, with or without cause. In addition, this Agreement does not purport to set forth all of the terms and conditions of my
employment, and, as an employee of Company, I have obligations to Company which are not set forth in this Agreement. However, the terms of this Agreement govern over any inconsistent terms and can only be changed by a subsequent written agreement
signed by the President of Company. 
 8. I agree that my obligations under paragraphs 2, 3, 4 and 5 of this Agreement shall
continue in effect after termination of my employment, regardless of the reason or reasons for termination, and whether such termination is voluntary or involuntary on my part, and that Company is entitled to communicate my obligations under this
Agreement to any future employer or potential employer of mine. My obligations under paragraphs 2, 3 and 4 also shall be binding upon my heirs, executors, assigns, and administrators and shall inure to the benefit of Company, it subsidiaries,
successors and assigns. 

  
 6 

 9. Any dispute in the meaning, effect or validity of this Agreement shall be resolved in
accordance with the laws of the State of California without regard to the conflict of laws provisions thereof. I further agree that if one or more provisions of this Agreement are held to be illegal or unenforceable under applicable California law,
such illegal or unenforceable portion(s) shall be limited or excluded from this Agreement to the minimum extent required so that this Agreement shall otherwise remain in full force and effect and enforceable in accordance with its terms. I also
understand that any breach of this Agreement will cause irreparable harm to Company for which damages would not be a adequate remedy, and, therefore, Company will be entitled to injunctive relief with respect thereto in addition to any other
remedies and without any requirement to post bond. 
 I HAVE READ THIS AGREEMENT CAREFULLY AND I UNDERSTAND AND ACCEPT THE
OBLIGATIONS WHICH IT IMPOSES UPON ME WITHOUT RESERVATION. NO PROMISES OR REPRESENTATIONS HAVE BEEN MADE TO ME TO INDUCE ME TO SIGN THIS AGREEMENT. I SIGN THIS AGREEMENT VOLUNTARILY AND FREELY, IN DUPLICATE, WITH THE UNDERSTANDING THAT THE COMPANY
WILL RETAIN ONE COUNTERPART AND THE OTHER COUNTERPART WILL BE RETAINED BY ME. 
  

			
	2/4, 2011	 	Employee
	 	 	 /s/ Jonathan Leff

		 	Signature
		
		 	 Jonathan Leff

		 	Name (Printed)

 Accepted and Agreed to: 
 KaloBios Pharmaceuticals, Inc. 
  

					
	By	 	 /s/ David Pritchard

  
 7 

 APPENDIX A 
 California Labor Code Section 2870. Application of provision providing that employee shall assign or offer to assign rights in invention to employer. 

(a) Any provision in an employment agreement which provides that an employee shall assign, or offer to assign, any of his or her rights
in an invention to his or her employer shall not apply to an invention that the employee developed entirely on his or her own time without using the employer’s equipment, supplies, facilities, or trade secret information except for those
inventions that either: 
 (i) Relate at the time of conception or reduction to practice of the invention to the
employer’s business, or actual or demonstrably anticipated research or development of the employer; or 
 (ii) Result from
any work performed by the employee for his employer. 
 (b) To the extent a provision in an employment agreement purports to
require an employee to assign an invention otherwise excluded from being required to be assigned under subdivision (a), the provision is against the public policy of this state and is unenforceable. 

 APPENDIX B 
 PRIOR MATTER 
 Disclosure: I am on a Board of a Healthcare Real Estate Investment fund which
aspires to build hospitals and medical office buildings (G2 Healthcare Investment Fund). 
 I have done some consulting work with Baxter
Bioscience on facilitating their regulatory submission for subcutaneous administration of IgG for immunodeficient patients using hyaluronidase as a dispersing agent. This work may continue over the coming months but is expected to be minimal in
nature and done on personal time. This work does not conflict with KaloBios in any way.

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