OmniAb SPAC Presentation Deck

LEGAL DISCLAIMERS Important Information and Where to Find It In connection with the proposed transaction, OmniAb will file a registration statement on Form 10 registering shares of OmniAb common stock and APAC will file with the SEC a registration statement on Form S-4 registering shares of APAC common stock, warrants and certain equity awards. The Form S-4 to be filed by APAC will include a proxy statement/prospectus in connection with the APAC shareholder vote required in connection with the proposed transaction. The Form 10 to be filed by OmniAb will include the Form S-4 registration statement filed by APAC which will serve as an information statement/prospectus in connection with the spin-off of OmniAb. This communication does not contain all the information that should be considered concerning the Business Combination. This communication is not a substitute for the registration statements that OmniAb and APAC will file with the SEC or any other documents that APAC or OmniAb may file with the SEC or that APAC, Ligand or OmniAb may send to stockholders in connection with the Business Combination. It is not intended to form the basis of any investment decision or any other decision in respect to the Business Combination. APAC's shareholders and Ligand's stockholders and other interested persons are advised to read, when available, the preliminary and definitive registration statements, and documents incorporated by reference therein, as these materials will contain important information about APAC, OmniAb and the Business Combination. The proxy statement/prospectus contained in APAC's registration statement will be mailed to APAC's shareholders as of a record date to be established for voting on the Business Combination. The registration statements, proxy statement/prospectus and other documents (when they are available) will also be available free of charge, at the SEC's website at www.sec.gov, or by directing a request to: Avista Healthcare Public Acquisition Corp. II, 65 East 55th Street, 18th Floor, New York, NY 10022. Participants in the Solicitation APAC, Ligand and OmniAb and each of their respective directors, executive officers and other members of their management and employees may be deemed to be participants in the solicitation of proxies from APAC's shareholders in connection with the Business Combination. Shareholders are urged to carefully read the proxy statement/prospectus regarding the Business Combination when it becomes available, because it will contain important information. Information regarding the persons who may, under the rules of the SEC, be deemed participants in the solicitation of APAC's shareholders in connection with the Business Combination will be set forth in the registration statement when it is filed with the SEC. Information about APAC's executive officers and directors and OmniAb's management and directors also will be set forth in the registration statement relating to the Business Combination when it becomes available. No Solicitation or Offer This presentation and any oral statements made in connection with this presentation shall neither constitute an offer to sell nor the solicitation of an offer to buy any securities, or the solicitation of any proxy, vote, consent or approval in any jurisdiction in connection with the proposed Business Combination, nor shall there be any sale of securities in any jurisdiction in which the offer, solicitation or sale would be unlawful prior to any registration or qualification under the securities laws of any such jurisdictions. This communication is restricted by law; it is not intended for distribution to, or use by any person in, any jurisdiction where such distribution or use would be contrary to local law or regulation. Trademarks This presentation contains trademarks, service marks, and trade names of Ligand, OmniAb, APAC and other companies, which are the property of their respective owners. Solely for convenience, the trademarks, service marks, trade names and copyrights referred to in this presentation may appear without the TM, SM, Ⓡ or ⒸO symbols, but such references are not intended to indicate, in any way, that APAC, Ligand or OmniAb will not assert, to the fullest extent under applicable law, their rights or the right of the applicable licensor to these trademarks, service marks, trade names and copyrights. 3 OmniAb

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