X0407 4 2023-06-23 0 0001846253 OmniAb, Inc. OABI 0001872349 Cochran Jennifer R. 5980 HORTON STREET, STE 600 EMERYVILLE CA 94608 1 0 0 0 0 Common Stock 91190 D Restricted Stock Units Common Stock 3792 3792 D Restricted Stock Units 2023-06-23 4 A 0 20000 0 A Common Stock 20000 23792 D Stock Option (right to buy) 4.81 2023-06-23 4 A 0 40000 0 A 2033-06-23 Common Stock 40000 40000 D The Reporting Person previously reported certain awards of Restricted Stock Units (RSUs) in Table I of Form 4, but has elected to report the RSUs in Table II going forward. As a result, the total reported in Column 5 of Table I has been updated to subtract 3,792 RSUs outstanding on June 23, 2023. Represents RSUs previously reported in Table I. Each RSU represents a contingent right to receive one share of the Issuer's Common Stock. Vesting occurs in two equal annual installments, beginning July 12th, 2023, subject to the Reporting Person's continued service to the Issuer through each such vesting date. Each Restricted Stock Unit (RSU) represents a contingent right to receive one share of the Issuer's Common Stock. The RSUs shall vest in full on the earlier of (A) the date of the next annual meeting of the Company's stockholders following the grant date and (B) the first anniversary of the date of grant. Each Stock Option shall vest and become exercisable in full on the earlier of (A) the date of the annual meeting of the Company's stockholders next following the grant date and (B) on the first anniversary of the date of grant. By: /s/ Charles S. Berkman For: Jennifer R. Cochran 2023-06-27