X0508 4 2024-02-15 0 0001846253 OmniAb, Inc. OABI 0001237556 FOEHR MATTHEW W 5980 HORTON STREET, STE 600 EMERYVILLE CA 94608 1 1 0 0 Chief Executive Officer 0 Common Stock 2024-02-15 4 M 0 10770 A 2676164 D Common Stock 2024-02-15 4 F 0 5459 5.54 D 2670705 D Common Stock 2024-02-15 4 M 0 26558 A 2697263 D Common Stock 2024-02-15 4 F 0 13460 5.54 D 2683803 D Restricted Stock Units 0.0 2024-02-15 4 M 0 10770 0.0 D Common Stock 10770 215591 D Restricted Stock Units 0.0 2024-02-15 4 M 0 26558 0.0 D Common Stock 26558 189033 D Restricted Stock Units 0.0 2024-02-16 4 A 0 109375 0.0 A Common Stock 109375 298408 D Stock Option (right to buy) 5.64 2024-02-16 4 A 0 656250 0.0 A 2034-02-16 Common Stock 656250 656250 D Represents the vesting of an RSU grant which occurs in two substantially equal annual installments beginning on February 15, 2023, as per the terms of the November 2022 Business Combination. Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock. Represents shares withheld to satisfy tax withholding obligations upon the vesting of previously reported RSUs. Represents the vesting of an RSU grant which occurs in three substantially equal annual installments beginning on February 15, 2023, as per the terms of the November 2022 Business Combination. The RSU grant vests in three substantially equal annual installments beginning on February 16, 2025. The Stock Option grant vests and is exercisable as to 12.5% of the underlying shares 6 months after the grant date, and in 42 substantially equal monthly installments thereafter. By: /s/ Charles S. Berkman, Attorney-in-Fact For: Matthew W. Foehr 2024-02-20