X0306 4 2022-11-01 0 0001846253 OmniAb, Inc. OABI 0001462354 GUSTAFSON KURT A C/O OMNIAB, INC. 5980 HORTON STREET, SUITE 600 EMERYVILLE CA 94608 0 1 0 0 EVP, Finance and CFO Common Stock 2022-11-01 4 A 0 160062 A 160062 D Stock Option 12.39 2022-11-01 4 A 0 348760 A 2032-04-08 Common Stock 348760 348760 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 69,752 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 72,872 earn-out shares subject to forfeiture provisions described in the Merger Agreement. The stock option vests and is exercisable as to 12.5% of the underlying shares on October 8, 2022, and in 42 substantially equal monthly installments thereafter. /s/ Charles S. Berkman, Attorney-in-Fact 2022-11-03