Matthew W. Foehr - 07 Dec 2025 Form 4 Insider Report for OmniAb, Inc. (OABI)

Role: President and CEO, Director
Signature: By: /s/ Charles S. Berkman, Attorney-in-Fact for Matthew W. Foehr
Issuer symbol: OABI
Transactions as of: 07 Dec 2025
Net transactions value: -$26,785
Form type: 4
Filing time: 09 Dec 2025, 09:01:14 UTC
Previous filing: 26 Aug 2025
Next filing: 05 Jan 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
FOEHR MATTHEW W	President and CEO, Director	5980 HORTON STREET, STE 600, EMERYVILLE	By: /s/ Charles S. Berkman, Attorney-in-Fact for Matthew W. Foehr	09 Dec 2025	0001237556

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	OABI	Common Stock	Options Exercise	$0	+26,554	+0.61%	$0.000000	4,373,749	07 Dec 2025	Direct	F1, F2, F3
transaction	OABI	Common Stock	Sale	$26,785	-13,666	-0.31%	$1.96	4,360,083	08 Dec 2025	Direct	F4, F5

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Underlying Class	Amount	Exercise Price	Ownership	Footnotes
transaction	OABI	Restricted Stock Units	Options Exercise	$0	-26,554	-8.5%	$0.000000	284,376	07 Dec 2025	Common Stock	26,554		Direct	F1, F2

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	Represents the vesting of an RSU grant which occurs in three substantially equal annual installments beginning on December 7, 2023.
F2	Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock.
F3	The total includes 5,208 shares acquired on November 28, 2025, through the Issuer's Employee Stock Purchase Plan (ESPP).
F4	Represents the number of shares required 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.
F5	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.94 to $2.01. 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 sold at each separate price within the range set forth in this footnote.