As of November 7, 2026, 2 holders' latest Schedule 13D or 13G filings report owning 5% or more of Fractyl Health, Inc. The largest reported stake is Nantahala Capital Management, LLC's, at 9.99%. 12 filings are on record since October 14, 2025 (Schedule 13G/A, May 15, 2026).
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Key facts
- · Reporting person: Catalio Capital Management, LP · Sole voting: 736,807 · Shared voting: 0 · Sole dispositive: 736,807 · Shared dispositive: 0 · SCHEDULE 13G, 2026-10-13
- · Holder: Nantahala Capital Management, LLC · Percent: 9.99% · SCHEDULE 13G/A
- · Holder: 683 Capital Management, LLC · Percent: 4.81% · SCHEDULE 13G/A
- · Holder: SilverArc Capital Management, LLC · Percent: 2.3% · SCHEDULE 13G/A
- · Holder: Alyeska Investment Group, L.P. · Percent: 4.97% · SCHEDULE 13G/A
Fractyl Health, Inc. has 12 Schedule 13D or 13G filings on record since 2025-10-14. 2 holders' latest filing reports 5% or more of common stock, $0.00001 par value per share. Each figure below is the holder's own, as filed, with the filing linked.
Layoffs on record: 1 filing or notice, latest 2026-10-22 (layoff filings and notices).
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Nantahala Capital Management, LLC | 9.99% | 16,124,780 | SCHEDULE 13G/A, 2026-05-15 | 2026-03-31 |
| Catalio Capital Management, LP | 5.6% | 736,807 | SCHEDULE 13G, 2026-10-13 | 2026-09-30 |
| Alyeska Investment Group, L.P. | 4.97% | 7,619,046 | SCHEDULE 13G/A, 2026-02-17 | 2025-12-31 |
| 683 Capital Management, LLC | 4.81% | 7,679,615 | SCHEDULE 13G/A, 2026-05-15 | 2026-03-31 |
| 4.7% | 6,460,102 | SCHEDULE 13G/A, 2026-02-12 | 2025-12-31 | |
| Cvf, LLC | 3.4% | 4,673,870 | SCHEDULE 13G/A, 2026-02-04 | 2026-02-04 |
| Maverick Capital, Ltd. | 3.1% | 4,248,492 | SCHEDULE 13G/A, 2025-11-14 | 2025-09-30 |
| SilverArc Capital Management, LLC | 2.3% | 3,606,386 | SCHEDULE 13G/A, 2026-05-13 | 2026-03-31 |
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More on Fractyl Health, Inc. and the records around it.
Fractyl Health, Inc. elsewhere on the record
- Leadership changes Oct 2026
- Who owns it
Companies that share a holder
- Mithril LP also filed stake reports on 1 other company: BlackSky Technology, Inc. (Aug 2026)
- Maverick Capital, Ltd. also filed stake reports on 5 other companies: Infleqtion, Inc. (May 2026), Invivyd, Inc. (Feb 2026), Peabody Energy Corporation (Feb 2026)
- SilverArc Capital Management, LLC also filed stake reports on 8 other companies: Cellectar Biosciences Inc (Aug 2026), ELUTIA INC. (Aug 2026), TELA BIO, INC. (Aug 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| Catalio Capital Management, LP | 736,807 | 0 | 736,807 | 0 | SCHEDULE 13G, 2026-10-13 |
| Catalio Capital GP, LLC | 736,807 | 0 | 736,807 | 0 | SCHEDULE 13G, 2026-10-13 |
| Vogelstein R Jacob | 736,807 | 0 | 736,807 | 0 | SCHEDULE 13G, 2026-10-13 |
| Petrocheilos George C | 736,807 | 0 | 736,807 | 0 | SCHEDULE 13G, 2026-10-13 |
The latest filing identifies Fractyl Health, Inc. by CUSIP 35168W202 and gives its principal executive office as 3 VAN DE GRAAFF DRIVE, SUITE 200, BURLINGTON, MA 01803 (SCHEDULE 13G, 2026-10-13).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-10-14 | 683 Capital Management, LLC | 5.33% | SCHEDULE 13G |
| 2025-11-14 | Maverick Capital, Ltd. | 3.1% | SCHEDULE 13G/A |
| 2025-11-14 | SilverArc Capital Management, LLC | 8.02% | SCHEDULE 13G |
| 2025-11-14 | Nantahala Capital Management, LLC | 9.99% | SCHEDULE 13G |
| 2025-11-14 | Alyeska Investment Group, L.P. | 9.7% | SCHEDULE 13G |
| 2026-02-04 | Cvf, LLC | 3.4% | SCHEDULE 13G/A |
| 2026-02-12 | Ajay Royan | 4.7% | SCHEDULE 13G/A |
| 2026-02-17 | Alyeska Investment Group, L.P. | 4.97% | SCHEDULE 13G/A |
| 2026-05-13 | SilverArc Capital Management, LLC | 2.3% | SCHEDULE 13G/A |
| 2026-05-15 | Nantahala Capital Management, LLC | 9.99% | SCHEDULE 13G/A |
| 2026-05-15 | 683 Capital Management, LLC | 4.81% | SCHEDULE 13G/A |
| 2026-10-13 | Catalio Capital Management, LP | 5.6% | SCHEDULE 13G |
Questions about who owns Fractyl Health, Inc.
Who owns Fractyl Health, Inc.?
On this page, 2 holders' latest ownership filings report 5% or more of Fractyl Health, Inc.: Nantahala Capital Management, LLC (9.99%, Schedule 13G/A, filed 2026-05-15) and Catalio Capital Management, LP (5.6%, Schedule 13G, filed 2026-10-13).
Who are the largest shareholders of Fractyl Health, Inc.?
By the share each holder's latest filing reports, the largest holders of Fractyl Health, Inc. on this page are Nantahala Capital Management, LLC (9.99%) and Catalio Capital Management, LP (5.6%).
When did Nantahala Capital Management, LLC buy into Fractyl Health, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Nantahala Capital Management, LLC on this page is the Schedule 13G, filed 2025-11-14, reporting 9.99%; its latest, Schedule 13G/A filed 2026-05-15, reports 9.99%.
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%); 12 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 Fractyl Health, Inc.
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| November 6, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
| October 22, 2026 | Leadership change: Harith Rajagopalan appointed, Chief Executive Officer | — | Leadership changes | 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.