X0306 4 2022-11-01 0 0001846253 OmniAb, Inc. OABI 0001872349 Cochran Jennifer R. C/O OMNIAB, INC. 5980 HORTON STREET, SUITE 600 EMERYVILLE CA 94608 1 0 0 0 Common Stock 2022-11-01 4 A 0 25226 A 25226 D Stock Option 14.50 2022-11-01 4 A 0 19298 A 2031-07-12 Common Stock 19298 19298 D Stock Option 9.10 2022-11-01 4 A 0 37840 A 2032-06-10 Common Stock 37840 37840 D Pursuant to the business combination of Avista Public Acquisition Corp. II and OmniAb, Inc. ("Legacy OmniAb"), as contemplated by an agreement and plan of merger, dated March 23, 2022 (the "Merger Agreement"), each share of common stock, option and award of restricted stock unit of Legacy OmniAb automatically converted into the right to receive securities of the Issuer with the same terms and conditions in accordance with an exchange ratio described in the Merger Agreement. Includes 12,545 restricted stock units ("RSUs"). Each RSU represents a contingent right to receive one share of the Issuer's Common Stock and does not expire. Includes 10,784 earn-out shares subject to forfeiture provisions described in the Merger Agreement. The stock option vests and is exercisable in three substantially equal annual installments beginning on July 12, 2022. The stock option fully vests on the earlier of (i) the date of the next annual meeting of the Issuer's stockholders or (ii) on June 10, 2023. /s/ Charles S. Berkman, Attorney-in-Fact 2022-11-03