Document:

EX-10.37

 Exhibit 10.37 

AMENDMENT TO 

EXECUTIVE EMPLOYMENT AGREEMENT 

This Amendment (this “Amendment”) to Executive Employment Agreement is made as of June 6, 2014. This
Amendment amends the Executive Employment Agreement, dated as of July 30, 2013, by and between Ambrx, Inc., a Delaware corporation (the “Company”), and Peter Alec Kiener (“Executive”) (the
“Agreement”). This Amendment will be effective upon the closing of the initial public offering of the Company. 

The Agreement is hereby amended as follows: 
  

	 	1.	 Section 7(a) of the Agreement is hereby amended and restated to read in its entirety as follows: 

“(a)(i) Termination Without Cause or By Executive For Certain Other Reasons. If
Executive’s Separation from Service occurs by reason of the termination of Executive’s employment (A) by the Company without Cause or (B) by Executive for Good Reason, in either case Executive shall be entitled to receive, in
lieu of any severance benefits to which Executive may otherwise be entitled under any severance plan or program of Company, the benefits provided below: 

(1)     The Company shall pay to Executive his fully earned but unpaid Base Salary, when due, through the
date of Separation from Service at the rate then in effect, plus all other amounts to which Executive is entitled under any compensation plan or practice of the Company at the time of Separation from Service; 

(2)     Subject to Executive’s continued compliance with Sections 8, 9 and 10, Executive shall be
entitled to receive a total severance benefit in cash in an amount equal to: (x) nine (9), multiplied by (y) Executive’s monthly Base Salary as in effect immediately prior to the date of Separation from Service. Such severance benefit
shall be payable in nine (9) equal monthly installments on the first day of each calendar month, commencing on the first day of the calendar month on or next following the sixtieth (60th) day after the date of Executive’s Separation
from Service; and 
 (3)     Subject to Executive’s continued compliance with Sections 8, 9 and 10,
for the period beginning on the date of Executive’s Separation from Service and ending on the date which is nine (9) full months following the date of Executive’s Separation from Service (or, if earlier, the date on which the
applicable continuation period expires), the Company shall provide Executive and his eligible dependents who were covered under the Company’s health plans as of the date of Executive’s Separation from Service with continuation coverage
under COBRA for a monthly premium equal to the monthly premium Executive would have been required to pay for health coverage for Executive and his eligible dependents who were covered by the Company’s health plans if Executive were an active
employee (provided that Executive shall be solely responsible for all matters relating to his continuation of coverage pursuant to COBRA, including, without limitation, his election of such overage and his timely payment of premiums). Such
continuation coverage shall be provided through insurance in accordance with the exemption under Treasury Regulation Section 1.409A-1(a)(5). For the avoidance of doubt, the Company shall not be required to pay any tax gross-up payment with
respect to such benefit. 

 (ii) Termination Without Cause or By Executive For Certain
Other Reasons in Connection with a Change in Control. If Executive’s Separation from Service occurs by reason of the termination of Executive’s employment (A) by the Company without Cause or (B) by Executive for Good Reason
within three (3) months prior to or twelve (12) months following a Change in Control, in either case Executive shall be entitled to receive, in lieu of any severance benefits to which Executive may otherwise be entitled under any severance
plan or program of Company, the benefits provided below: 
 (1)     The Company shall pay to Executive
his fully earned but unpaid Base Salary, when due, through the date of Separation from Service at the rate then in effect, plus all other amounts to which Executive is entitled under any compensation plan or practice of the Company at the time of
Separation from Service; 
 (2)     Subject to Executive’s continued compliance with Sections 8, 9
and 10, Executive shall be entitled to receive a total severance benefit in cash in an amount equal to: (x) twelve (12), multiplied by (y) Executive’s monthly Base Salary as in effect immediately prior to the date of Separation from
Service. Such severance benefit shall be paid in a lump sum payment on the sixtieth (60th) day following the date of Executive’s Separation from Service; 

(3)     Subject to Executive’s continued compliance with Sections 8, 9 and 10, Executive shall be
entitled to receive Executive’s Target Bonus for the year in which the Separation from Service occurs. Such severance benefit shall be paid in a lump sum payment on the sixtieth
(60th) day following the date of Executive’s Separation from Service; and 

(4)     Subject to Executive’s continued compliance with Sections 8, 9 and 10, Executive shall be
entitled to receive a cash payment equal to: (x) twelve (12), multiplied by (y) the monthly premium Executive would have been required to pay for continuation coverage pursuant to COBRA for Executive and his eligible dependents who were
covered by the Company’s health plans as of the date of Executive’s Separation from Service (calculated by reference to the premium as of the date of termination) (provided that Executive shall be solely responsible for all matters
relating to his continuation of coverage pursuant to COBRA, including, without limitation, his election of such coverage and his timely payment of premiums). Such severance benefit shall be paid in a lump sum payment on the sixtieth (60th) day following the date of Executive’s Separation from Service. For the avoidance of doubt, the Company shall not be required to pay any tax gross-up payment with respect to such
benefit.” 
  

	 	2.	 The Agreement, as amended herein, shall remain in full force and effect. 

  
 2 

 THE PARTIES TO THIS AMENDMENT HAVE READ THE FOREGOING AMENDMENT AND FULLY
UNDERSTAND EACH AND EVERY PROVISION CONTAINED HEREIN. WHEREFORE, THE PARTIES HAVE EXECUTED THIS AMENDMENT ON THE DATES SHOWN BELOW. 
  

									
		 		 		 	PETER ALEC KIENER
				
	Dated:	 	 June 6, 2014
	 		 	 /s/ Peter Alec Kiener

		 		 		 	Address:	 	  

		 		 		 		 	  

				
		 		 		 	 AMBRX, INC.

					
	Dated:	 	 June 6, 2014
	 		 	By:	 	 /s/ Lawson Macartney

		 		 		 	Name:	 	 Lawson Macartney

		 		 		 	Title:	 	 President and Chief Executive Officer

  
 3EX-10.38

 Exhibit 10.38 

AMENDMENT TO 

EXECUTIVE EMPLOYMENT AGREEMENT 

This Amendment (this “Amendment”) to Executive Employment Agreement is made as of June 6, 2014. This
Amendment amends the Executive Employment Agreement, dated as of March 14, 2011, by and between Ambrx, Inc., a Delaware corporation (the “Company”), and Simon Allen (“Executive”) (the
“Agreement”). This Amendment will be effective upon the closing of the initial public offering of the Company. 

The Agreement is hereby amended as follows: 
  

	 	1.	 Section 7(a) of the Agreement is hereby amended and restated to read in its entirety as follows: 

“(a)(i)    Termination Without Cause or By Executive For Good Reason. If
Executive’s Separation from Service occurs by reason of the termination of Executive’s employment by the Company without Cause or by Executive for Good Reason, Executive shall be entitled to receive, in lieu of any severance benefits to
which Executive may otherwise be entitled under any severance plan or program of Company, the benefits provided below: 

(A)    The Company shall pay to Executive his fully earned but unpaid Base Salary, when due, through the
date of Separation from Service at the rate then in effect, plus all other amounts to which Executive is entitled under any compensation plan or practice of the Company at the time of Separation from Service. In the event Executive remains employed
through the last day of the calendar year immediately preceding the calendar year in which his Separation from Service occurs, Executive shall be entitled to receive any bonus amount earned but unpaid for such calendar year, provided, that any such
bonus amount shall be paid no later than March 15 of the calendar year following the calendar year in which it was earned; 

(B)    Subject to Executive’s continued compliance with Sections 8, 9 and 10, Executive shall be
entitled to receive a total severance benefit in cash in an amount equal to nine (9), multiplied by Executive’s monthly Base Salary as in effect immediately prior to the date of Separation from Service. Such severance benefit shall be payable
in nine (9) equal monthly installments on the first day of each calendar month, commencing on the first day of the calendar month on or next following the sixtieth (60th) day after the date of Executive’s Separation from Service; and

 (C)    Subject to Executive’s continued compliance with Sections 8, 9 and 10, Executive shall be
entitled to receive a cash lump sum payment equal to nine (9) times the amount of the COBRA premium paid by the Company at the time of Executive’s Separation from Service, which shall be paid on the first day of the calendar month on or
next following the sixtieth (60th) day after the date of Executive’s Separation from Service. For the avoidance of doubt, the Company shall not be required to pay any tax gross-up payment with respect to such lump sum cash payment. 

(ii)    Termination Without Cause or By Executive For Good Reason in Connection with a
Change in Control. If Executive’s Separation from Service occurs by reason of the termination of Executive’s employment by the Company without Cause or by Executive for Good Reason within three (3) months prior to or twelve
(12) months following a Change in Control, in either case Executive shall be entitled to receive, in lieu of any severance benefits to which Executive 

 
may otherwise be entitled under any severance plan or program of Company, the benefits provided below: 

(A)    The Company shall pay to Executive his fully earned but unpaid Base Salary, when due, through the
date of Separation from Service at the rate then in effect, plus all other amounts to which Executive is entitled under any compensation plan or practice of the Company at the time of Separation from Service; 

(B)    Subject to Executive’s continued compliance with Sections 8, 9 and 10, Executive shall be
entitled to receive a total severance benefit in cash in an amount equal to twelve (12), multiplied by Executive’s monthly Base Salary as in effect immediately prior to the date of Separation from Service. Such severance benefit shall be paid
in a lump sum payment on the sixtieth (60th) day following the date of Executive’s Separation from Service; 

(C)    Subject to Executive’s continued compliance with Sections 8, 9 and 10, Executive shall be
entitled to receive Executive’s Target Bonus for the year in which the Separation from Service occurs. Such severance benefit shall be paid in a lump sum payment on the sixtieth
(60th) day following the date of Executive’s Separation from Service; and 

(D)    Subject to Executive’s continued compliance with Sections 8, 9 and 10, Executive shall be
entitled to receive a cash lump sum payment equal to twelve (12), multiplied by the monthly premium Executive would have been required to pay for continuation coverage pursuant to COBRA for Executive and his eligible dependents who were covered by
the Company’s health plans as of the date of Executive’s Separation from Service (calculated by reference to the premium as of the date of termination) (provided that Executive shall be solely responsible for all matters relating to his
continuation of coverage pursuant to COBRA, including, without limitation, his election of such coverage and his timely payment of premiums). Such severance benefit shall be paid in a lump sum payment on the sixtieth (60th) day following the date of Executive’s Separation from Service. For the avoidance of doubt, the Company shall not be required to pay any tax gross-up payment with respect to such lump sum
cash payment.” 
  

	 	2.	 Section 7(f) of the Agreement is hereby amended and restated to read in its entirety as follows: 

“No Mitigation. Executive shall not be required to mitigate the amount of any payment provided for in this Section 7
by seeking other employment or otherwise, nor shall the amount of any payment or benefit provided for in this Section 7 be reduced by any compensation earned by Executive as the result of employment by another employer or self-employment or by
retirement benefits; provided, however, that loans, advances or other amounts owed by Executive to the Company may be offset by the Company against amounts payable to Executive under this Section 7.” 

 

	 	3.	 The Agreement, as amended herein, shall remain in full force and effect. 

  
 2 

 THE PARTIES TO THIS AMENDMENT HAVE READ THE FOREGOING AMENDMENT AND FULLY
UNDERSTAND EACH AND EVERY PROVISION CONTAINED HEREIN. WHEREFORE, THE PARTIES HAVE EXECUTED THIS AMENDMENT ON THE DATES SHOWN BELOW. 
  

									
		 		 		 	SIMON ALLEN
				
	Dated:	 	 June 6, 2014
	 		 	 /s/ Simon Allen

					
		 		 		 	Address:	 	 16870 Camino Lago de Cristal

		 		 		 		 	 Rancho Santa Fe, CA 92067

				
		 		 		 	AMBRX, INC.
					
	Dated:	 	 June 6, 2014
	 		 	By:	 	 /s/ Lawson Macartney

		 		 		 	Name:	 	 Lawson Macartney

		 		 		 	Title:	 	 President and Chief Executive Officer

  
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