Sec Form 4 Filing - FOEHR MATTHEW W @ OmniAb, Inc. - 2023-08-14

FORM 4 Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934, Section 17(a) of the Public Utility Holding Company Act of 1935 or Section 30(h) of the Investment Company Act of 1940

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1. Name and Address of Reporting Person FOEHR MATTHEW W 2. Issuer Name and Ticker or Trading Symbol OmniAb, Inc. [ OABI] 5. Relationship of Reporting Person(s) to Issuer (Check all applicable) X __ Director _____ 10% Owner X __ Officer (give title below) _____ Other (specify below) President and CEO (Last) (First) (Middle) 5980 HORTON STREET, STE 600 3. Date of Earliest Transaction (MM/DD/YY) 08/14/2023 (Street) EMERYVILLE, CA94608 4. If Amendment, Date Original Filed (MM/DD/YY) 6. Individual or Joint/Group Filing (Check Applicable Line) __ X __ Form filed by One Reporting Person _____ Form filed by More than One Reporting Person (City) (State) (Zip)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned 1.Title of Security (Instr. 3) 2. Transaction Date (MM/DD/YY) 2A. Deemed Execution Date, if any (MM/DD/YY) 3. Transaction Code (Instr. 8) 4. Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5) 5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4) 6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4) 7. Nature of Indirect Beneficial Ownership (Instr. 4) Code V Amount (A) or (D) Price Common Stock 08/14/2023 P 45,000 A $ 5.48 ( 1 ) 2,332,919 ( 2 ) D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned ( e.g. , puts, calls, warrants, options, convertible securities) 1. Title of Derivative Security (Instr. 3) 2. Conversion or Exercise Price of Derivative Security 3. Transaction Date (MM/DD/YY) 3A. Deemed Execution Date, if any (MM/DD/YY) 4. Transaction Code (Instr. 8) 5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4, and 5) 6. Date Exercisable and Expiration Date (MM/DD/YY) 7. Title and Amount of Underlying Securities (Instr. 3 and 4) 8. Price of Derivative Security (Instr. 5) 9. Number of Derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4) 10. Ownership Form of Derivative Security: Direct (D) or Indirect (I) (Instr. 4) 11. Nature of Indirect Beneficial Ownership (Instr. 4) Code V (A) (D) Date Exercisable Expiration Date Title Amount or Number of Shares Restricted Stock Units ( 3 ) ( 3 ) ( 3 ) Common Stock 10,770 10,770 ( 2 ) D Restricted Stock Units ( 4 ) ( 4 ) ( 4 ) Common Stock 33,173 43,943 ( 2 ) D Restricted Stock Units ( 5 ) ( 5 ) ( 5 ) Common Stock 53,107 97,050 ( 2 ) D Restricted Stock Units ( 6 ) ( 6 ) ( 6 ) Common Stock 79,665 176,715 ( 2 ) D Restricted Stock Units ( 7 ) ( 7 ) ( 7 ) Common Stock 109,375 286,090 ( 2 ) D

Reporting Owners Reporting Owner Name / Address Relationships Director 10% Owner Officer Other FOEHR MATTHEW W 5980 HORTON STREET, STE 600 EMERYVILLE, CA94608 X President and CEO Signatures By: /s/ Charles S. Berkman For: Matthew W. Foehr 08/15/2023 Signature of Reporting Person Date

Explanation of Responses:

( 1 )The price reported in Column 4 is a weighted average price. These shares were purchased in multiple transactions at prices ranging from $5.370 to $5.590. The reporting person undertakes to provide the Issuer, any security holder of the Issuer, or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares purchased at each separate price within the range set forth in this footnote. ( 2 )The Reporting Person previously reported certain awards of Restricted Stock Units (RSUs) in Table I of Form 4, but has elected to report the RSUs in Table II going forward. As a result, the total reported in Column 5 of Table I has been updated to subtract 286,090 RSUs outstanding on August 14, 2023. ( 3 )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 15, 2024. ( 4 )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 December 31, 2023. ( 5 )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 two substantially equal annual installments beginning February 15, 2024. ( 6 )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 three substantially equal annual installments, beginning December 7, 2023. ( 7 )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 three substantially equal annual installments, beginning April 7, 2024.

Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.

* If the form is filed by more than one reporting person, see Instruction 4(b)(v).

** Intentional misstatements or omissions of facts constitute Federal Criminal Violations. See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).

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