X0508 4 2023-12-07 0 0001846253 OmniAb, Inc. OABI 0001392266 Berkman Charles S 5980 HORTON STREET STE 600 EMERYVILLE CA 94608 0 1 0 0 Chief Legal Officer 0 Common Stock 2023-12-07 4 M 0 15622 A 267359 D Common Stock 2023-12-07 4 F 0 5403 4.85 D 261956 D Restricted Stock Units 0 Common Stock 5698 5698 D Restricted Stock Units 0 Common Stock 17556 23254 D Restricted Stock Units 0 Common Stock 31239 54493 D Restricted Stock Units 0 Common Stock 46864 101357 D Restricted Stock Units 0 Common Stock 40625 141982 D Restricted Stock Units 0 2023-12-07 4 M 0 15622 0 A Common Stock 15622 126360 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 amount of beneficially held securities includes non-reportable transactions post the reporting person's last ownership report. The balance was increased by 16,695 shares acquired on May 31, 2023, and 4,051 shares acquired on November 30, 2023, from the Issuer's Employee Stock Purchase Plan (ESPP). It was concurrently reduced by the transfer of 41,591 OABI common stock shares to the reporting person's ex-spouse per a domestic relations order. Additionally, the reporting person transferred the option to purchase 50,004 OABI common stock shares, as previously reported in Table II, at varied exercise prices. The reporting person no longer reports as beneficially owned any securities owned by his ex-spouse. 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 shall occur in full February 15th, 2024, subject to the Reporting Person's continued service. Represents RSUs previously reported in Table I. Each RSU represents a contingent right to receive one share of the Issuer's Common Stock. Vests in full December 31st, 2023, subject to the Reporting Person's continued service. 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 installments in February 15th, 2024, and February 15th, 2025, subject to the Reporting Person's continued service. 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. /s/ Charles S. Berkman 2023-12-11