As of November 6, 2026, 2 holders' latest Schedule 13D or 13G filings report owning 5% or more of OmniAb, Inc. The largest reported stake is Robert Goldstein's, at 8.5%. 7 filings are on record since July 1, 2025 (Schedule 13G/A, February 10, 2026).
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Key facts
- · Reporting person: Whitefort Capital Management, LP · Sole voting: 0 · Shared voting: 10,248,658 · Sole dispositive: 0 · Shared dispositive: 10,248,658 · SCHEDULE 13G/A, 2026-08-14
- · Reporting person: Ash X LP · Sole voting: 7,557,202 · Shared voting: 0 · Sole dispositive: 7,557,202 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-02-10
- · Holder: Whitefort Capital Management, LP · Percent: 9.9% · SCHEDULE 13G/A
- · Holder: Robert Goldstein · Percent: 7% · SCHEDULE 13G/A
- · Holder: Whitefort Capital Management, LP · Percent: 8.4% · SCHEDULE 13G/A
OmniAb, Inc. has 7 Schedule 13D or 13G filings on record since 2025-07-01. 2 holders' latest filing reports 5% or more of common stock, $0.0001 par value per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| 8.5% | 12,291,972 | SCHEDULE 13G/A, 2026-02-10 | 2025-12-31 | |
| Whitefort Capital Management, LP | 7.1% | 10,248,658 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| Janus Henderson Group Plc | 0.8% | 948,434 | SCHEDULE 13G/A, 2025-08-14 | 2025-06-30 |
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More on OmniAb, Inc. and the records around it.
OmniAb, Inc. elsewhere on the record
- Leadership changes Jul 2026
- Form D filing Sep 2025
- Who owns it
Companies that share a holder
- Whitefort Capital Management, LP also filed stake reports on 3 other companies: Arbutus Biopharma Corp (Sep 2026), Bally's Corp (Mar 2026), INNOVATE Corp. (Nov 2025)
- JANUS HENDERSON GROUP PLC also filed stake reports on 104 other companies: SURGERY PARTNERS, INC. (Nov 2026), EYEPOINT, INC. (Sep 2026), TELEFLEX INCORPORATED (Sep 2026)
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What the Full Report on OmniAb, Inc. covers
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Ash X LP | 7,557,202 | 0 | 7,557,202 | 0 | SCHEDULE 13G/A, 2026-02-10 |
| Rlg Gp LLC | 7,557,202 | 0 | 7,557,202 | 0 | SCHEDULE 13G/A, 2026-02-10 |
| RLG Capco II LLC | 4,733,575 | 0 | 4,733,575 | 0 | SCHEDULE 13G/A, 2026-02-10 |
| Gotham Asset Management, LLC | 1,195 | 0 | 1,195 | 0 | SCHEDULE 13G/A, 2026-02-10 |
| Gotham Asset Management Holdings, LP | 1,195 | 0 | 1,195 | 0 | SCHEDULE 13G/A, 2026-02-10 |
| Gotham GP LLC | 1,195 | 0 | 1,195 | 0 | SCHEDULE 13G/A, 2026-02-10 |
| Robert Goldstein | 12,290,777 | 1,195 | 12,290,777 | 1,195 | SCHEDULE 13G/A, 2026-02-10 |
| Joel Greenblatt | 1,428,571 | 1,195 | 1,428,571 | 1,195 | SCHEDULE 13G/A, 2026-02-10 |
| Whitefort Capital Management, LP | 0 | 10,248,658 | 0 | 10,248,658 | SCHEDULE 13G/A, 2026-08-14 |
| David Salanic | 0 | 10,248,658 | 0 | 10,248,658 | SCHEDULE 13G/A, 2026-08-14 |
| Joseph Kaplan | 0 | 10,248,658 | 0 | 10,248,658 | SCHEDULE 13G/A, 2026-08-14 |
The latest filing identifies OmniAb, Inc. by CUSIP 68218J103 and gives its principal executive office as 5980 HORTON STREET, SUITE 600, EMERYVILLE, CA 94608 (SCHEDULE 13G/A, 2026-08-14).
What the percentages are based on
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.Robert Goldstein, SCHEDULE 13G/A, 2026-02-10
The percentage of Shares reported owned by each person named herein is based upon 144,972,579 Shares outstanding as of April 30, 2026, as reported on the Issuer's Form 10-Q filed with the Securities and Exchange Commission on May 7, 2026. As of the close of business on June 30, 2026, each of the Reporting Persons may be deemed to beneficially own 7.1% of the outstanding Shares.Whitefort Capital Management, LP, SCHEDULE 13G/A, 2026-08-14
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-01 | Robert Goldstein | 5.3% | SCHEDULE 13G |
| 2025-08-14 | Whitefort Capital Management, LP | 8.4% | SCHEDULE 13G/A |
| 2025-08-14 | Janus Henderson Group Plc | 0.8% | SCHEDULE 13G/A |
| 2025-08-27 | Robert Goldstein | 7% | SCHEDULE 13G/A |
| 2025-11-14 | Whitefort Capital Management, LP | 9.9% | SCHEDULE 13G/A |
| 2026-02-10 | Robert Goldstein | 8.5% | SCHEDULE 13G/A |
| 2026-08-14 | Whitefort Capital Management, LP | 7.1% | SCHEDULE 13G/A |
Questions about who owns OmniAb, Inc.
Who owns OmniAb, Inc.?
On this page, 2 holders' latest ownership filings report 5% or more of OmniAb, Inc.: Robert Goldstein (8.5%, Schedule 13G/A, filed 2026-02-10) and Whitefort Capital Management, LP (7.1%, Schedule 13G/A, filed 2026-08-14).
Who are the largest shareholders of OmniAb, Inc.?
By the share each holder's latest filing reports, the largest holders of OmniAb, Inc. on this page are Robert Goldstein (8.5%) and Whitefort Capital Management, LP (7.1%).
When did Robert Goldstein buy into OmniAb, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Robert Goldstein on this page is the Schedule 13G, filed 2025-07-01, reporting 5.3%; its latest, Schedule 13G/A filed 2026-02-10, reports 8.5%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 7 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
Also on the record for OmniAb, Inc.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| July 13, 2026 | Leadership change: Amechi Nwachuku appointed, Chief Operating Officer | — | Leadership changes | Source |
| September 10, 2025 | Form D, private offering | $30M sold | Form D page | Source |
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.