Dean Thompson Form 4 OmniAb / Thompson Dean ownership change

Exhibit 99.1

Joint Filer Information

Name of Joint Filer:	Avista Acquisition LP II
Address of Joint Filer:	65 East 55th Street, 18th Floor
	New York, NY 10022
Relationship of Joint Filer to Issuer:	10% Owner, Director
Issuer Name and Ticker or Trading Symbol:	OmniAb,Inc. [OABI]
Date of Earliest Transaction Required to be Reported (Month/Day/Year):	December 9, 2022
Designated Filer:	Avista Acquisition GP LLC II

Signature:
Avista Acquisition LP II
/s/ Benjamin Silbert
Name:	Benjamin Silbert
Title:	Attorney-in-fact

Dated: December 13, 2022

Joint Filer Information

(continued)

Name of Joint Filer:	Avista Acquisition GP LLC II
Address of Joint Filer:	65 East 55th Street, 18th Floor
	New York, NY 10022
Relationship of Joint Filer to Issuer:	10% Owner, Director
Issuer Name and Ticker or Trading Symbol:	OmniAb,Inc. [OABI]
Date of Earliest Transaction Required to be Reported (Month/Day/Year):	December 9, 2022
Designated Filer:	Avista Acquisition GP LLC II

Signature:
Avista Acquisition GP LLC II
/s/ Benjamin Silbert
Name:	Benjamin Silbert
Title:	Attorney-in-fact

Dated: December 13, 2022

Joint Filer Information

(continued)

Name of Joint Filer:	Thompson Dean
Address of Joint Filer:	65 East 55th Street, 18th Floor
	New York, NY 10022
Relationship of Joint Filer to Issuer:	10% Owner, Director
Issuer Name and Ticker or Trading Symbol:	OmniAb,Inc. [OABI]
Date of Earliest Transaction Required to be Reported (Month/Day/Year):	December 9, 2022
Designated Filer:	Avista Acquisition GP LLC II

Signature:
By:	/s/ Benjamin Silbert
	Name: Benjamin Silbert, Attorney-in-Fact for Thompson Dean

Dated: December 13, 2022

Joint Filer Information

(continued)

Name of Joint Filer:	David Burgstahler
Address of Joint Filer:	65 East 55th Street, 18th Floor
	New York, NY 10022
Relationship of Joint Filer to Issuer:	10% Owner, Director
Issuer Name and Ticker or Trading Symbol:	OmniAb,Inc. [OABI]
Date of Earliest Transaction Required to be Reported (Month/Day/Year):	December 9, 2022
Designated Filer:	Avista Acquisition GP LLC II

Signature:
By:	/s/ Benjamin Silbert
	Name: Benjamin Silbert, Attorney-in-Fact for David Burgstahler

Dated: December 13, 2022

Joint Filer Information

(continued)

Name of Joint Filer:	Joshua Tamaroff
Address of Joint Filer:	65 East 55th Street, 18th Floor
	New York, NY 10022
Relationship of Joint Filer to Issuer:	10% Owner, Director
Issuer Name and Ticker or Trading Symbol:	OmniAb,Inc. [OABI]
Date of Earliest Transaction Required to be Reported (Month/Day/Year):	December 9, 2022
Designated Filer:	Avista Acquisition GP LLC II

Signature:
By:	/s/ Benjamin Silbert
	Name: Benjamin Silbert, Attorney-in-Fact for Joshua Tamaroff

Dated: December 13, 2022

Joint Filer Information

(continued)

Name of Joint Filer:	Avista Capital Partners V, L.P.
Address of Joint Filer:	65 East 55th Street, 18th Floor
	New York, NY 10022
Relationship of Joint Filer to Issuer:	10% Owner, Director
Issuer Name and Ticker or Trading Symbol:	OmniAb,Inc. [OABI]
Date of Earliest Transaction Required to be Reported (Month/Day/Year):	December 9, 2022
Designated Filer:	Avista Acquisition GP LLC II

Signature:
Avista CAPITAL PARTNERS V, L.P.
/s/ Benjamin Silbert
Name:	Benjamin Silbert
Title:	Attorney-in-fact

Dated: December 13, 2022

Joint Filer Information.

(continued)

Name of Joint Filer:	Avista Capital Partners (Offshore) V, L.P.
Address of Joint Filer:	65 East 55th Street, 18th Floor
	New York, NY 10022
Relationship of Joint Filer to Issuer:	10% Owner, Director
Issuer Name and Ticker or Trading Symbol:	OmniAb,Inc. [OABI]
Date of Earliest Transaction Required to be Reported (Month/Day/Year):	December 9, 2022
Designated Filer:	Avista Acquisition GP LLC II

Signature:
Avista CAPITAL PARTNERS (OFFSHORE) V, l.P.
/s/ Benjamin Silbert
Name:	Benjamin Silbert
Title:	Attorney-in-fact

Dated: December 13, 2022

Joint Filer Information

(continued)

Name of Joint Filer:	Avista Capital Partners V GP, L.P.
Address of Joint Filer:	65 East 55th Street, 18th Floor
	New York, NY 10022
Relationship of Joint Filer to Issuer:	10% Owner, Director
Issuer Name and Ticker or Trading Symbol:	OmniAb,Inc. [OABI]
Date of Earliest Transaction Required to be Reported (Month/Day/Year):	December 9, 2022
Designated Filer:	Avista Acquisition GP LLC II

Signature:
Avista CAPITAL PARTNERS V GP, L.P.
/s/ Benjamin Silbert
Name:	Benjamin Silbert
Title:	Attorney-in-fact

Dated: December 13, 2022

Joint Filer Information

(continued)

Name of Joint Filer:	Avista Capital Managing Member V, LLC
Address of Joint Filer:	65 East 55th Street, 18th Floor
	New York, NY 10022
Relationship of Joint Filer to Issuer:	10% Owner, Director
Issuer Name and Ticker or Trading Symbol:	OmniAb,Inc. [OABI]
Date of Earliest Transaction Required to be Reported (Month/Day/Year):	December 9, 2022
Designated Filer:	Avista Acquisition GP LLC II

Signature:
Avista CAPITAL MANAGING MEMBER V, LLC
/s/ Benjamin Silbert
Name:	Benjamin Silbert
Title:	Attorney-in-fact

Dated: December 13, 2022