OmniAb, Inc. — Director's Dealing 2025

Dec 9, 2025

SEC Form 4 — Statement of Changes in Beneficial Ownership

Issuer: OmniAb, Inc. (OABI)
CIK: 0001846253
Period of Report: 2025-12-07

Reporting Person: Berkman Charles S (Chief Legal Officer)

Non-Derivative Transactions

Date	Security	Code	Shares	Price	A/D	Holdings After	Ownership
2025-12-07	Common Stock	M	15621	—	Acquired	385115	Direct
2025-12-08	Common Stock	S	8044	$1.96	Disposed	377071	Direct

Derivative Transactions

Date	Security	Exercise Price	Code	Shares	A/D	Expiration	Underlying	Ownership
2025-12-07	Restricted Stock Units	$0	M	15621	Disposed		Common Stock (15621)	Direct

Footnotes

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 6,282 shares acquired on May 30, 2025 and 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.