X0508 4 2023-12-07 0 0001846253 OmniAb, Inc. OABI 0001462354 GUSTAFSON KURT A 5980 HORTON STREET, STE 600 EMERYVILLE CA 94608 0 1 0 0 Executive VP, Finance & CFO 0 Common Stock 2023-12-07 4 M 0 46503 A 174786 D Common Stock 2023-12-07 4 F 0 16081 4.85 D 158705 D Restricted Stock Units 0 Common Stock 46498 46498 D Restricted Stock Units 0 Common Stock 139504 186002 D Restricted Stock Units 0 Common Stock 40625 226627 D Restricted Stock Units 0 2023-12-07 4 M 0 46503 0 D Common Stock 46503 180124 D Represents Restricted Stock Units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's Common Stock. The RSUs shall vest in three substantially equal annual installments beginning on December 07, 2023, subject to the Reporting Person's continued service to the Issuer through each such vesting date. The total includes 8,334 shares acquired on May 31, 2023, and 11,160 shares acquired on November 30, 2023, through the Issuer's Employee Stock Purchase Plan (ESPP). Represents shares withheld to satisfy tax withholding obligations upon the vesting of previously reported restricted stock units ("RSUs"). 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 substantially equal annual installments, beginning April 1st, 2024, subject to the Reporting Person's continued service to the Issuer through each such vesting date. 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 three substantially equal annual installments, beginning December 7th, 2023, subject to the Reporting Person's continued service to the Issuer through each such vesting date. 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 three substantially equal annual installments, beginning April 7th, 2024, subject to the Reporting Person's continued service to the Issuer through each such vesting date. By: /s/ Charles S. Berkman, Attorney-In-Fact For: Kurt A. Gustafson 2023-12-11