144 0001392266 XXXXXXXX LIVE 0001846253 OmniAb, Inc. 001-40720 5980 HORTON STREET SUITE 600 EMERYVILLE CA 94608 510-250-7800 Berkman Charles S Officer COMMON MORGAN STANLEY SMITH BARNEY LLC EXECUTIVE SERVICES

200 W CIVIC CENTER DR. 4TH FLOOR SANDY UT 84070

7157 10628.15 144782647 04/07/2026 NASDAQ COMMON 04/07/2026 RESTRICTED STOCK ISSUER N 13542 04/07/2026 COMPENSATION N Charles S Berkman

5980 HORTON STREET SUITE 600 Emeryville CA 94608

COMMON 02/17/2026 6990 11889.51 Charles S Berkman

5980 HORTON STREET SUITE 600 Emeryville CA 94608

COMMON 02/18/2026 9673 16561.26 Represents the number of shares expected to be sold by the reporting person to cover tax withholding obligations in connection with the vesting of RSUs. These sales are mandated by the Issuer's election under its equity incentive plans to require the satisfaction of a tax withholding obligation to be funded by a sell-to-cover transaction and do not represent discretionary trades by the reporting person. 04/07/2026 /s/ Charles S. Berkman