# EDGAR Filing Document

**Accession Number:** 0002075484
**File Stem:** 0001011438-25-000456
**Filing Date:** 2025-8
**Character Count:** 19822
**Document Hash:** c46de05af3f04dd68f03736d8f82ad31
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0001011438-25-000456.hdr.sgml**: 20250827

**ACCESSION NUMBER**: 0001011438-25-000456

**CONFORMED SUBMISSION TYPE**: SCHEDULE 13G/A

**PUBLIC DOCUMENT COUNT**: 2

**FILED AS OF DATE**: 20250827

**DATE AS OF CHANGE**: 20250827

**SUBJECT COMPANY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** OmniAb, Inc.
- **CENTRAL INDEX KEY:** 0001846253
- **STANDARD INDUSTRIAL CLASSIFICATION:** SERVICES-COMMERCIAL PHYSICAL & BIOLOGICAL RESEARCH [8731]
- **ORGANIZATION NAME:** 08 Industrial Applications and Services
- **EIN:** 000000000
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13G/A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 005-92783
- **FILM NUMBER:** 251261032

**BUSINESS ADDRESS:**
- **STREET 1:** 5980 HORTON STREET
- **STREET 2:** SUITE 600
- **CITY:** EMERYVILLE
- **STATE:** CA
- **ZIP:** 94608
- **BUSINESS PHONE:** 510-250-7800

**MAIL ADDRESS:**
- **STREET 1:** 5980 HORTON STREET
- **STREET 2:** SUITE 600
- **CITY:** EMERYVILLE
- **STATE:** CA
- **ZIP:** 94608

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** Avista Public Acquisition Corp. II
- **DATE OF NAME CHANGE:** 20210212
**FILED BY**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** Ash X LP
- **CENTRAL INDEX KEY:** 0002075484

**ORGANIZATION NAME:**
- **EIN:** 823628598
- **STATE OF INCORPORATION:** DE
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** SCHEDULE 13G/A

**BUSINESS ADDRESS:**
- **STREET 1:** 825 THIRD AVENUE, SUITE 1750
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022
- **BUSINESS PHONE:** 212.319.4100

**MAIL ADDRESS:**
- **STREET 1:** 825 THIRD AVENUE, SUITE 1750
- **CITY:** NEW YORK
- **STATE:** NY
- **ZIP:** 10022

## Exhibit 99.1

#### 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<br>By: RLG GP LLC, its general partner<br>|
| Signature: <u>/s/ Robert Goldstein</u> |
| Name/Title: Robert Goldstein/Managing Member, RLG GP LLC, its General Partner |

---

---

| |
|:---|
| RLG GP LLC<br>|
| Signature: <u>/s/ Robert Goldstein</u> |
| Name/Title: Robert Goldstein/Managing Member |

---

---

| |
|:---|
| RLG Capco II LLC<br>|
| Signature: <u>/s/ Robert Goldstein</u> |
| Name/Title: Robert Goldstein/Manager |
| Robert Goldstein  |
| Signature: <u>/s/ Robert Goldstein</u>  |
| Name/Title: Robert Goldstein/Self |
| Joel Greenblatt |
| Signature: <u>/s/ Joel Greenblatt</u> |
| Name/Title: Joel Greenblatt/Self |

---

### UNITED STATES SECURITIES AND EXCHANGE COMMISSION
**Washington, D.C. 20549**

## SCHEDULE 13G

### Under the Securities Exchange Act of 1934

**(Amendment No. 1)**

**Issuer:** OmniAb, Inc.

**Title of Class of Securities:** Common Stock, par value $0.0001 per share

**CUSIP Number:** 68218J103

**Date of Event Which Requires Filing of this Statement:** 08/26/2025

**Check the appropriate box to designate the rule pursuant to which this Schedule is filed:**

- [ ] Rule 13d-1(b)

- [x] Rule 13d-1(c)

- [ ] Rule 13d-1(d)

---

| 1. | Names of Reporting Persons<br>Ash X LP | Names of Reporting Persons<br>Ash X LP |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>DE | Citizenship or Place of Organization<br>DE |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>8271347 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>0 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>8271347 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>0 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>8271347 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>8271347 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>5.8% | Percent of Class Represented by Amount in Row (9)<br>5.8% |
| 12. | Type of Reporting Person (See Instructions)<br>PN | Type of Reporting Person (See Instructions)<br>PN |

---

| 1. | Names of Reporting Persons<br>RLG GP LLC | Names of Reporting Persons<br>RLG GP LLC |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>DE | Citizenship or Place of Organization<br>DE |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>8271347 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>0 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>8271347 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>0 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>8271347 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>8271347 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>5.8% | Percent of Class Represented by Amount in Row (9)<br>5.8% |
| 12. | Type of Reporting Person (See Instructions)<br>OO | Type of Reporting Person (See Instructions)<br>OO |

---

| 1. | Names of Reporting Persons<br>RLG Capco II LLC | Names of Reporting Persons<br>RLG Capco II LLC |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>DE | Citizenship or Place of Organization<br>DE |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>1800246 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>0 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>1800246 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>0 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>1800246 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>1800246 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>1.3% | Percent of Class Represented by Amount in Row (9)<br>1.3% |
| 12. | Type of Reporting Person (See Instructions)<br>OO | Type of Reporting Person (See Instructions)<br>OO |

---

| 1. | Names of Reporting Persons<br>Robert Goldstein | Names of Reporting Persons<br>Robert Goldstein |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>X1 | Citizenship or Place of Organization<br>X1 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>10071593 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>0 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>10071593 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>0 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>10071593 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>10071593 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>7% | Percent of Class Represented by Amount in Row (9)<br>7% |
| 12. | Type of Reporting Person (See Instructions)<br>IN | Type of Reporting Person (See Instructions)<br>IN |

---

| 1. | Names of Reporting Persons<br>Joel Greenblatt | Names of Reporting Persons<br>Joel Greenblatt |
|:---|:---|:---|:---|
| 2. | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] | Check the Appropriate Box if a Member of a Group (See Instructions)<br>(a) [ ] (b) [ ] |
| 3. | SEC Use Only | SEC Use Only |
| 4. | Citizenship or Place of Organization<br>X1 | Citizenship or Place of Organization<br>X1 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 5. | Sole Voting Power<br>1428571 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 6. | Shared Voting Power<br>0 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 7. | Sole Dispositive Power<br>1428571 |
| Number of<br>Shares<br>Beneficially<br>Owned by<br>Each<br>Reporting<br>Person<br>With | 8. | Shared Dispositive Power<br>0 |
| 9. | Aggregate Amount Beneficially Owned by Each Reporting Person<br>1428571 | Aggregate Amount Beneficially Owned by Each Reporting Person<br>1428571 |
| 10. | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] | Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See Instructions) [ ] |
| 11. | Percent of Class Represented by Amount in Row (9)<br>1% | Percent of Class Represented by Amount in Row (9)<br>1% |
| 12. | Type of Reporting Person (See Instructions)<br>IN | Type of Reporting Person (See Instructions)<br>IN |

---

**Item 1(a). Name of Issuer:**
OmniAb, Inc.

**Item 1(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) Robert Goldstein, and (v) Joel Greenblatt (collectively, the "Reporting Persons")

**Item 2(b). Address of Principal Business Office:**
For each of the Reporting Persons:  825 Third Avenue, Floor 17, New York, New York 10022.

**Item 2(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) Robert Goldstein is a United States citizen, and (v) Joel Greenblatt is a United States citizen.

**Item 2(d). Title of Class of Securities:**
Common Stock, par value $0.0001 per share

**Item 2(e). CUSIP Number:**
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).

(b) [ ] Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

(c) [ ] Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c).

(d) [ ] Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8).

(e) [ ] An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);

(f) [ ] An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);

(g) [ ] A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);

(h) [ ] A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);

(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);

(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:

(k) [ ] Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).

**Item 4. Ownership:**

**(a) Amount beneficially owned:**

As of the date hereof, Ash X is the direct holder and beneficial owner of 8,271,347 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 be deemed to exercise voting and investment power over such shares of Common Stock of the Issuer directly held by Ash X and thus may be deemed to beneficially own such shares of Common Stock. As the Managing Member of RLG GP, Robert Goldstein may be deemed to exercise voting and investment power over such shares of Common Stock of the Issuer directly held by Ash X and thus may be deemed to beneficially own such shares of Common Stock. RLG Capco II is the direct holder and beneficial owner of 1,800,246 shares of Common Stock of the Issuer.  As the Manager of RLG Capco II, Robert Goldstein may be deemed to exercise voting and investment power over such shares of Common Stock of the Issuer held directly by RLG Capco II and thus may be deemed to beneficially own such shares of Common Stock.  Joel Greenblatt is the direct holder and beneficial owner of 1,428,571 shares of Common Stock.

**(b) Percent of class:**

As of the date hereof, Ash X and RLG GP may each be deemed to beneficially own approximately 5.8% of the shares of Common Stock of the Issuer outstanding.  As of the date hereof, RLG Capco II may be deemed to beneficially own approximately 1.3% of the shares of Common Stock of the Issuer outstanding.  As of the date hereof, Robert Goldstein may be deemed to beneficially own approximately 7.0% of the shares of Common Stock of the Issuer outstanding. As of the date hereof, Joel Greenblatt may be deemed to beneficially own approximately 1.0% of the shares of Common Stock of the Issuer outstanding.  Such percentages are based on 122,701,294 shares of Common Stock outstanding as of July 30, 2025, as disclosed in the Issuer's Form 10-Q filed with the Securities and Exchange Commission ("SEC") on August 6, 2025, plus 21,254,106 additional shares of Common Stock issued as disclosed in the Issuer's Form 8-K filed with the SEC on August 25, 2025.

**(c) Number of shares as to which the person has:**

**(i) Sole power to vote or to direct the vote:**

As of the date hereof, Ash X and RLG GP may each be deemed to have sole power to vote or to direct the vote of 8,271,347 shares of Common Stock of the Issuer.  As of the date hereof, RLG Capco II may be deemed to have sole power to vote or to direct the vote of 1,800,246 shares of Common Stock of the Issuer.  As of the date hereof, Robert Goldstein may be deemed to have sole power to vote or to direct the vote of 10,071,593 shares of Common Stock of the Issuer.  As of the date hereof, Joel Greenblatt may be deemed to have sole power to vote or to direct the vote of 1,428,571 shares of Common Stock of the Issuer.

**(ii) Shared power to vote or to direct the vote:**

As of the date hereof, each of the Reporting Persons may be deemed to have shared power to vote or to direct the vote of 0 shares of Common Stock of the Issuer.

**(iii) Sole power to dispose or to direct the disposition of:**

As of the date hereof, Ash X and RLG GP may each be deemed to have sole power to dispose or to direct the disposition of 8,271,347 shares of Common Stock of the Issuer. As of the date hereof, RLG Capco II may be deemed to have sole power to dispose or to direct the disposition of 1,800,246 shares of Common Stock of the Issuer.  As of the date hereof, Robert Goldstein may be deemed to have sole power to dispose or to direct the disposition of 10,071,593 shares of Common Stock of the Issuer.  As of the date hereof, Joel Greenblatt may be deemed to have the 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 the date hereof, each of the Reporting Persons may be deemed to have shared power to dispose or to direct the disposition of 0 shares of Common Stock of the Issuer.

**Item 5. Ownership of Five Percent or Less of a Class.**

[x] If this statement is being filed to report the fact that as of the date hereof the reporting person has ceased to be the beneficial owner of more than five percent of the class of securities, check the following.

**Item 6. Ownership of More than 5 Percent on Behalf of Another Person.**

Not Applicable

**Item 7. Identification and Classification of the 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**

Not Applicable

**Item 9. Notice of Dissolution of Group**

Not Applicable

**Item 10. Certification:**

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under ?? 240.14a-11.

### SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

**Ash X LP**

**Date:** 08/27/2025

**By:** /s/ Robert Goldstein

**Name & Title:** Robert Goldstein/Managing Member, RLG GP LLC, its General Partner

**RLG GP LLC**

**Date:** 08/27/2025

**By:** /s/ Robert Goldstein

**Name & Title:** Robert Goldstein/Managing Member

**RLG Capco II LLC**

**Date:** 08/27/2025

**By:** /s/ Robert Goldstein

**Name & Title:** Robert Goldstein/Manager

**Robert Goldstein**

**Date:** 08/27/2025

**By:** /s/ Robert Goldstein

**Name & Title:** Robert Goldstein/Self

**Joel Greenblatt**

**Date:** 08/27/2025

**By:** /s/ Joel Greenblatt

**Name & Title:** Joel Greenblatt/Self