OmniAb, Inc.

For the period ended Sep 30, 2025. Filed Nov 4, 2025.

About this filing

A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Sep 30, 2025 · Filed Nov 4, 2025

OABI$5.30+5.4%Stored close · as of Nov 9, 2026

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Contents

ITEM 6. Exhibits

Incorporated by Reference
ExhibitNumber	Description of Exhibit	Form	File Number	Date of Filing	Exhibit Number	Filed Herewith
2.1+	Agreement and Plan of Merger, dated March 23, 2022, by and among Avista Public Acquisition Corp. II, Orwell Merger Sub Inc., Ligand Pharmaceuticals Incorporated and OmniAb, Inc.	S-4	333-264525	September 27, 2022	2.1
2.2+	Separation and Distribution Agreement, dated March 23, 2022, by and among Avista Public Acquisition Corp. II, Ligand Pharmaceuticals Incorporated and OmniAb, Inc.	S-4	333-264525	September 27, 2022	2.2
3.1	Certificate of Incorporation of the Registrant	10-K	001-40720	March 30, 2023	3.1
3.2	Bylaws of the Registrant	8-K	001-40720	November 7, 2022	3.2
4.1	Warrant Agreement, dated August 9, 2021, between Avista Public Acquisition Corp. II and Continental Stock Transfer & Trust Company, as warrant agent	8-K	001-40720	August 12, 2021	4.1
4.2	Assignment, Assumption and Amendment Agreement, dated November 1, 2022, by and among OmniAb, Inc., Continental Stock Transfer & Trust Company and Computershare Trust Company, N.A.	8-K	001-40720	November 7, 2022	4.2
4.3	Specimen Warrant Certificate	S-1/A	333-257177	July 28, 2021	4.3
4.4	Specimen Common Stock Certificate of OmniAb, Inc.	S-4	333-264525	September 27, 2022	4.5
10.1	Securities Purchase Agreement, dated August 24, 2025, by and between OmniAb, Inc. and each of the purchasers party thereto	8-K	001-40720	August 25, 2025	10.1
31.1	Certification of Chief Executive Officer, as required by Rule 13a-14(a) or Rule 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002					X
31.2	Certification of Chief Financial Officer, as required by Rule 13a-14(a) or Rule 15d-14(a), as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002					X
32.1*	Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002					X
32.2*	Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002					X
101.INS	Inline XBRL Instance Document – the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document					X
101.SCH	Inline XBRL Taxonomy Extension Schema Document					X
101.CAL	Inline XBRL Taxonomy Calculation Linkbase Document					X
101.DEF	Inline XBRL Taxonomy Definition Linkbase Document					X
101.LAB	Inline XBRL Taxonomy Extension Label Linkbase Document					X
101.PRE	Inline XBRL Taxonomy Extension Presentation Linkbase Document					X
104	Cover Page Interactive Data File (formatted as inline XBRL and contained in Exhibit 101)					X

Certain schedules and annexes have been omitted in accordance with Item 601(b)(2) of Regulation S-K. A copy of any omitted schedule and/or annex will be furnished as a supplement to the SEC upon request.

*This certification is deemed not filed for purposes of Section 18 of the Exchange Act or otherwise subject to the liability of that section, nor shall it be deemed incorporated by reference into any filing under the Securities Act or the Exchange Act.

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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.