OmniAb, Inc. — Director's Dealing 2026

Feb 18, 2026

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: OmniAb, Inc. (OABI)
CIK: 0001846253
Period of Report: 2026-02-18

Reporting Person: GUSTAFSON KURT A (Executive VP, Finance and CFO)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2026-02-18	Common Stock	M	18750	—	Acquired	278152	Direct
2026-02-18	Common Stock	S	9301	$1.71	Disposed	268851	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2026-02-18	Restricted Stock Units	$0	M	18750	Disposed		Common Stock (18750)	Direct
2026-02-18	Restricted Stock Units	$0	A	60000	Acquired		Common Stock (60000)	Direct
2026-02-18	Stock Option	$1.71	A	600000	Acquired	2036-02-18	Common Stock (600000)	Direct

Footnotes

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.