Daniel J. O'Connor - 11 Dec 2023 Form 4 Insider Report for Ambrx Biopharma, Inc.

Role: President and CEO, Director
Signature: /s/ Sonja Nelson, Attorney-in-Fact for Daniel J. O'Connor
Issuer symbol: N/A
Transactions as of: 11 Dec 2023
Net transactions value: $0
Form type: 4
Filing time: 11 Dec 2023, 17:15:00 UTC
Previous filing: 31 Oct 2023
Next filing: 08 Jan 2024
SEC: View on sec.gov

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	AMAM	Common Stock	Award	$0	+750,000	+122%	$0.000000	1,363,332	11 Dec 2023	Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents Restricted Stock Units ("RSUs") payable in common stock of the Issuer granted to the Reporting Person on December 11, 2023 (the "Grant Date"). The RSUs were granted in connection with the completion of the year-end review process and will be issued pursuant to the Company's Amended and Restated 2021 Equity Incentive Plan. The award represents an aggregate of the Reporting Person's year-end and make-whole awards based on market data for similarly situated officers at peer companies.
F2	The RSUs will vest over thirty-six (36) months as follows: (i) one-sixth (1/6) of the RSUs will vest on the six (6)-month anniversary of the Grant Date, and (ii) one-twelfth (1/12) of the RSUs will vest on a quarterly basis thereafter.

Content

Represents Restricted Stock Units ("RSUs") payable in common stock of the Issuer granted to the Reporting Person on December 11, 2023 (the "Grant Date"). The RSUs were granted in connection with the completion of the year-end review process and will be issued pursuant to the Company's Amended and Restated 2021 Equity Incentive Plan. The award represents an aggregate of the Reporting Person's year-end and make-whole awards based on market data for similarly situated officers at peer companies.

The RSUs will vest over thirty-six (36) months as follows: (i) one-sixth (1/6) of the RSUs will vest on the six (6)-month anniversary of the Grant Date, and (ii) one-twelfth (1/12) of the RSUs will vest on a quarterly basis thereafter.