Daniel J. O'Connor - 07 Mar 2024 Form 4 Insider Report for Ambrx Biopharma, Inc.

Footnote F1

This Form 4 reports securities disposed of pursuant to the terms of the Agreement and Plan of Merger (the "Merger Agreement"), dated as of January 5, 2024, among the Issuer, Johnson & Johnson ("J&J"), and Charm Merger Sub, Inc., a wholly owned subsidiary of J&J ("Merger Sub"), pursuant to which Merger Sub merged with and into the Issuer (the "Merger"), effective as of March 7, 2024 (such date and time of such Merger, the "Effective Time"), with the Issuer surviving the Merger as a wholly owned subsidiary of J&J.

Footnote F2

Pursuant to the Merger Agreement, at the Effective Time, each outstanding share of common stock of the Issuer ("Company Common Stock") reported in this Form 4 was converted into the right to receive an amount equal to $28.00 per share in cash (the "Merger Consideration"), without interest and less any applicable withholding taxes.

Footnote F3

Each of these restricted stock units ("RSUs") represents a contingent right to receive one share of the Company Common Stock.

Footnote F4

These RSUs vest as follows: (i) one-third (1/3) of the RSUs will vest on the 12-month anniversary of April 26, 2023 (the "Grant Date"), (ii) one-third (1/3) of the RSUs will vest on the 24-month anniversary of the Grant Date, and (iii) one-third (1/3) of the RSUs will vest on the 36-month anniversary of the Grant Date.

Footnote F5

Pursuant to the Merger Agreement, at the Effective Time, each of these RSUs that was outstanding as of immediately prior to the Effective Time was cancelled and the Reporting Person was entitled to receive the Merger Consideration, without interest and less any applicable withholding taxes, in respect of each such RSU.

Footnote F6

These RSUs vest as follows: (i) one-sixth (1/6) of the RSUs will vest on the six (6)-month anniversary of the grant date of December 11, 2023, and (ii) one-twelfth (1/12) of the RSUs will vest on a quarterly basis thereafter.

Footnote F7

The Company Common Stock subject to the options to purchase shares of Company Common Stock (each, a "Company Option") vest as follows: (i) twenty-five (25) percent of the Company Common Stock vested on November 1, 2023, and (ii) the remainder vests in thirty-six equal monthly installments following such date.

Footnote F8

Pursuant to the Merger Agreement, at the Effective Time, each Company Option that was outstanding and unexercised as of immediately prior to the Effective Time, whether vested or unvested, with a per share exercise price ("Per Share Exercise Price") that was less than the Merger Consideration, was cancelled and converted into the right to receive an amount in cash (without interest and less any applicable withholding taxes) equal to the product of (i) the aggregate number of shares of Company Common Stock underlying such Company Option immediately prior to the Effective Time, and (ii) the excess of (A) the Merger Consideration over (B) the Per Share Exercise Price of such Company Option. Each Company Option that had a Per Share Exercise Price that was equal to or exceeded the amount of the Merger Consideration at the Effective Time was cancelled for no consideration.

Footnote F9

The Company Common Stock subject to the Company Options vest as follows: (i) 1/6 of the Company Common Stock vested on January 5, 2024, and the remainder vests in ten (10) equal quarterly installments following such date.