KURT A. GUSTAFSON - 18 Feb 2026 Form 4 Insider Report for OmniAb, Inc. (OABI)

Role: Executive VP, Finance and CFO
Signature: By: /s/ Charles S. Berkman, Attorney-in-Fact For: Kurt A. Gustafson
Issuer symbol: OABI
Transactions as of: 18 Feb 2026
Net transactions value: -$15,905
Form type: 4
Filing time: 18 Feb 2026, 18:35:30 UTC
Previous filing: 17 Feb 2026
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
GUSTAFSON KURT A	Executive VP, Finance and CFO	5980 HORTON STREET, STE 600, EMERYVILLE	By: /s/ Charles S. Berkman, Attorney-in-Fact For: Kurt A. Gustafson	18 Feb 2026	0001462354

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	OABI	Common Stock	Options Exercise	$0	+18,750	+7.2%	$0.000000	278,152	18 Feb 2026	Direct	F1, F2
transaction	OABI	Common Stock	Sale	$15,905	-9,301	-3.3%	$1.71	268,851	18 Feb 2026	Direct	F3, F4

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	-18,750	-22%	$0.000000	64,584	18 Feb 2026	Common Stock	18,750	$0.000000	Direct	F1, F2
transaction	OABI	Restricted Stock Units	Award	$0	+60,000	+93%	$0.000000	124,584	18 Feb 2026	Common Stock	60,000	$0.000000	Direct	F2, F5
transaction	OABI	Stock Option	Award	$0	+600,000		$0.000000	600,000	18 Feb 2026	Common Stock	600,000	$1.71	Direct	F6

* 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 February 18, 2026
F2	Each Restricted Stock Unit ("RSU") represents a contingent right to receive one share of the Issuer's Common Stock.
F3	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.
F4	The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $1.68 to $1.73. 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.
F5	The RSU grant vests in three substantially equal annual installments beginning on February 18, 2027.
F6	The Stock Option grant vests and is exercisable as to 12.5% of the underlying shares 6 months after the grant date, and in 42 substantially equal monthly installments thereafter.