EXHIBIT 99.1

JOINT FILING AGREEMENT

In accordance with Rule 13d-1(k)(1) under the Securities Exchange Act of 1934, as amended, the persons named below agree to the joint filing on behalf of each of them of a Statement on Schedule 13G dated August 27, 2025 (including amendments thereto) with respect to the Common Stock, par value $0.0001 per share, of OmniAb, Inc. This Joint Filing Agreement shall be filed as an Exhibit to such Statement. The undersigned acknowledge that each shall be responsible for the timely filing of any amendments to such joint filing and for the completeness and accuracy of the information concerning him or it contained herein and therein, but shall not be responsible for the completeness and accuracy of the information concerning the other.

	Ash X LP By: RLG GP LLC, its general partner
	Signature: /s/ Robert Goldstein
	Name/Title: Robert Goldstein/Managing Member, RLG GP LLC, its General Partner

	RLG GP LLC
	Signature: /s/ Robert Goldstein
	Name/Title: Robert Goldstein/Managing Member

	RLG Capco II LLC
	Signature: /s/ Robert Goldstein
	Name/Title: Robert Goldstein/Manager


	Robert Goldstein

	Signature: /s/ Robert Goldstein
	Name/Title: Robert Goldstein/Self


	Joel Greenblatt

	Signature: /s/ Joel Greenblatt
	Name/Title: Joel Greenblatt/Self

OmniAb, Inc. SCHEDULE 13G/A