| Item 1. | |
| (a) | Name of issuer:
OmniAb, Inc. |
| (b) | Address of issuer's principal executive offices:
5980 Horton Street, Suite 600, Emeryville, California, 94608 |
| Item 2. | |
| (a) | Name of person filing:
(i) Ash X LP ("Ash X"), (ii) RLG GP LLC ("RLG GP"), (iii) RLG Capco II LLC ("RLG Capco II"), (iv) Gotham Asset Management, LLC (the "Adviser"), (v) Gotham Asset Management Holdings, LP ("Gotham Parent"), (vi) Gotham GP LLC ("GP of Gotham Parent"), (vii) Robert Goldstein, and (viii) Joel Greenblatt (collectively, the "Reporting Persons") |
| (b) | Address or principal business office or, if none, residence:
For each of the Reporting Persons: 825 Third Avenue, Floor 17, New York, New York 10022. |
| (c) | Citizenship:
(i) Ash X is a Delaware limited partnership, (ii) RLG GP is a Delaware limited liability company, (iii) RLG Capco II is a Delaware limited liability company, (iv) the Adviser is a Delaware limited liability company, (v) Gotham Parent is a Delaware limited partnership, (vi) GP of Gotham Parent is a Delaware limited liability company, (vii) Robert Goldstein is a United States citizen, and (viii) Joel Greenblatt is a United States citizen. |
| (d) | Title of class of securities:
Common Stock, par value $0.0001 per share |
| (e) | CUSIP No.:
68218J103 |
| Item 3. | If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a: |
| (a) |  Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
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| (b) | Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
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| (c) | Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
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| (d) | Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
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| (e) |  An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
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| (f) | An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
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| (g) | A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
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| (h) | A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
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| (i) | A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
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| (j) | A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J),
please specify the type of institution:
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| (k) | Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
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| Item 4. | Ownership |
| (a) | Amount beneficially owned:
As of December 31, 2025, Ash X was the direct holder and beneficial owner of 7,557,202 shares of Common Stock, par value $0.0001 per share ("Common Stock") of OmniAB, Inc. (the "Issuer"). As the General Partner of Ash X, RLG GP may have been deemed to have exercised voting and investment power over such shares of Common Stock of the Issuer that were directly held by Ash X and thus may have been deemed to have beneficially owned such shares of Common Stock. As the Managing Member of RLG GP, Robert Goldstein may have been deemed to have exercised voting and investment power over such shares of Common Stock of the Issuer that were directly held by Ash X and thus may have been deemed to have beneficially owned such shares of Common Stock. As of December 31, 2025, RLG Capco II was the direct holder and beneficial owner of 4,733,575 shares of Common Stock of the Issuer. As the Manager of RLG Capco II, Robert Goldstein may have been deemed to have exercised voting and investment power over such shares of Common Stock of the Issuer that were held directly by RLG Capco II and thus may have been deemed to have beneficially owned such shares of Common Stock. As of December 31, 2025, a certain managed account (the "Account") for which the Adviser serves as investment manager was the direct holder of 1,195 shares of Common Stock. As the investment manager for the Account, the Adviser may have been deemed to have exercised voting and investment power over such shares of Common Stock of the Issuer that were directly held by the Account and thus may have been deemed to have beneficially owned such shares of Common Stock. As the sole owner of the Adviser, Gotham Parent may have been deemed to have exercised voting and investment power over such shares of Common Stock of the Issuer that were directly held by the Account and thus may have been deemed to have beneficially owned such shares of Common Stock. As the general partner of Gotham Parent, GP of Gotham Parent may have been deemed to have exercised voting and investment power over such shares of Common Stock of the Issuer that were directly held by the Account and thus may have been deemed to have beneficially owned such shares of Common Stock. As the members and managers of GP of Gotham Parent, Robert Goldstein and Joel Greenblatt may have been deemed to have exercised voting and investment power over such shares of Common Stock of the Issuer that were directly held by the Account and thus may have been deemed to have beneficially owned such shares of Common Stock. As of December 31, 2025, Joel Greenblatt was the direct holder and beneficial owner of 1,428,571 shares of Common Stock. |
| (b) | Percent of class:
As of December 31, 2025, Ash X and RLG GP may have been deemed to have each beneficially owned approximately 5.3% of the shares of Common Stock of the Issuer outstanding. As of December 31, 2025, RLG Capco II may have been deemed to have beneficially owned approximately 3.3% of the shares of Common Stock of the Issuer outstanding. As of December 31, 2025, the Adviser, Gotham Parent and GP of Gotham Parent may have been deemed to have each beneficially owned less than 1% of the shares of Common Stock outstanding. As of December 31, 2025, Robert Goldstein may have been deemed to have beneficially owned approximately 8.5% of the shares of Common Stock of the Issuer outstanding. As of December 31, 2025, Joel Greenblatt may have been deemed to have beneficially owned approximately 1.0% of the shares of Common Stock of the Issuer outstanding. Such percentages are based on 143,955,400 shares of Common Stock outstanding as of October 28, 2025, as disclosed in the Issuer's Form 10-Q filed with the Securities and Exchange Commission on November 4, 2025. |
| (c) | Number of shares as to which the person has:
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| | (i) Sole power to vote or to direct the vote:
As of December 31, 2025, Ash X and RLG GP each may have been deemed to have had sole power to vote or to direct the vote of 7,557,202 shares of Common Stock of the Issuer. As of December 31, 2025, RLG Capco II may have been deemed to have had sole power to vote or to direct the vote of 4,733,575 shares of Common Stock of the Issuer. As of December 31, 2025, the Adviser, Gotham Parent and GP of Gotham Parent may have been deemed to have had sole power to vote or to direct the vote of 1,195 shares of Common Stock of the Issuer. As of December 31, 2025, Robert Goldstein may have been deemed to have had sole power to vote or to direct the vote of 12,290,777 shares of Common Stock of the Issuer. As of December 31, 2025, Joel Greenblatt may have been deemed to have had sole power to vote or to direct the vote of 1,428,571 shares of Common Stock of the Issuer.
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| | (ii) Shared power to vote or to direct the vote:
As of December 31, 2025, each of Robert Goldstein and Joel Greenblatt may have been deemed to have had shared power to vote or to direct the vote of 1,195 shares of Common Stock of the Issuer. As of December 31, 2025, each of the Reporting Persons other than Robert Goldstein and Joel Greenblatt may have been deemed to have had shared power to vote or to direct the vote of 0 shares of Common Stock of the Issuer.
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| | (iii) Sole power to dispose or to direct the disposition of:
As of December 31, 2025, Ash X and RLG GP may each have been deemed to have had sole power to dispose or to direct the disposition of 7,557,202 shares of Common Stock of the Issuer. As December 31, 2025, RLG Capco II may have been deemed to have had sole power to dispose or to direct the disposition of 4,733,575 shares of Common Stock of the Issuer. As of December 31, 2025, the Adviser, Gotham Parent and GP of Gotham Parent may have been deemed to have had sole power to dispose or to direct the disposition of 1,195 shares of Common Stock of the Issuer. As of December 31, 2025, Robert Goldstein may have been deemed to have had sole power to dispose or to direct the disposition of 12,290,777 shares of Common Stock of the Issuer. As of December 31, 2025, Joel Greenblatt may have been deemed to have had sole power to dispose or to direct the disposition of 1,428,571 shares of Common Stock of the Issuer.
|
| | (iv) Shared power to dispose or to direct the disposition of:
As of December 31, 2025, each of Robert Goldstein and Joel Greenblatt may have been deemed to have had shared power to dispose or to direct the disposition of 1,195 shares of Common Stock of the Issuer. As of December 31, 2025, each of the Reporting Persons other than Robert Goldstein and Joel Greenblatt may have been deemed to have had shared power to dispose or to direct the disposition of 0 shares of Common Stock of the Issuer.
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| Item 5. | Ownership of 5 Percent or Less of a Class. |
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Not Applicable
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| Item 6. | Ownership of more than 5 Percent on Behalf of Another Person. |
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Not Applicable
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| Item 7. | Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person. |
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If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary.
The disclosure regarding the relationship between the Reporting Persons in Item 4 is incorporated by reference herein. |
| Item 8. | Identification and Classification of Members of the Group. |
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Not Applicable
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| Item 9. | Notice of Dissolution of Group. |
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Not Applicable
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