As of November 6, 2026, 5 holders' latest Schedule 13D or 13G filings report owning 5% or more of JATT III Acquisition Corp. The largest reported stake is JATT Ventures III L.P.'s, at 22.1%. 5 filings are on record since September 2, 2026 (Schedule 13D, September 3, 2026).
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Key facts
- · Reporting person: JATT Ventures III L.P. · Sole voting: 1,959,000 · Shared voting: 0 · Sole dispositive: 1,959,000 · Shared dispositive: 0 · SCHEDULE 13D, 2026-09-03
- · Reporting person: RA Capital Management, L.P. · Sole voting: 0 · Shared voting: 450,000 · Sole dispositive: 0 · Shared dispositive: 450,000 · SCHEDULE 13G, 2026-09-03
- · Reporting person: Deep Track Capital, LP · Sole voting: 0 · Shared voting: 450,000 · Sole dispositive: 0 · Shared dispositive: 450,000 · SCHEDULE 13G, 2026-09-02
- · Reporting person: Great Point Partners, LLC · Sole voting: 0 · Shared voting: 450,000 · Sole dispositive: 0 · Shared dispositive: 450,000 · SCHEDULE 13G, 2026-09-02
- · Reporting person: Commodore Capital LP · Sole voting: 0 · Shared voting: 400,000 · Sole dispositive: 0 · Shared dispositive: 400,000 · SCHEDULE 13G, 2026-09-02
JATT III Acquisition Corp has 5 Schedule 13D or 13G filings on record since 2026-09-02. 5 holders' latest filing reports 5% or more of ordinary shares, par value $0.0001 per share. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| JATT Ventures III L.P. | 22.1% | 1,959,000 | SCHEDULE 13D, 2026-09-03 | 2026-08-27 |
| Deep Track Capital, LP | 5.83% | 450,000 | SCHEDULE 13G, 2026-09-02 | 2026-08-26 |
| Great Point Partners, LLC | 5.83% | 450,000 | SCHEDULE 13G, 2026-09-02 | 2026-08-26 |
| Commodore Capital LP | 5.2% | 400,000 | SCHEDULE 13G, 2026-09-02 | 2026-08-26 |
| RA Capital Management, L.P. | 5.1% | 450,000 | SCHEDULE 13G, 2026-09-03 | 2026-08-27 |
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More on JATT III Acquisition Corp and the records around it.
Companies that share a holder
- Great Point Partners, LLC also filed stake reports on 14 other companies: LeonaBio, Inc. (Nov 2026), Research Alliance Corporation III (Sep 2026), AMANAT ACQUISITION CORP (Aug 2026)
- Commodore Capital LP also filed stake reports on 40 other companies: Sagimet Biosciences Inc. (Oct 2026), Surrozen, Inc./DE (Oct 2026), InflaRx N.V. (Aug 2026)
- Deep Track Capital, LP also filed stake reports on 59 other companies: Alector, Inc. (Oct 2026), TCGX Acquisition Corp. II (Oct 2026), Frazier Life Sciences Acquisition Corp. II (Oct 2026)
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| JATT Ventures III L.P. | 1,959,000 | 0 | 1,959,000 | 0 | SCHEDULE 13D, 2026-09-03 |
| Someit Sidhu | 1,959,000 | 0 | 1,959,000 | 0 | SCHEDULE 13D, 2026-09-03 |
| Deep Track Capital, LP | 0 | 450,000 | 0 | 450,000 | SCHEDULE 13G, 2026-09-02 |
| Deep Track Biotechnology Master Fund, Ltd. | 0 | 341,955 | 0 | 341,955 | SCHEDULE 13G, 2026-09-02 |
| David Kroin | 0 | 450,000 | 0 | 450,000 | SCHEDULE 13G, 2026-09-02 |
| Deep Track Special Opportunities Fund, LP. | 0 | 108,045 | 0 | 108,045 | SCHEDULE 13G, 2026-09-02 |
| Great Point Partners, LLC | 0 | 450,000 | 0 | 450,000 | SCHEDULE 13G, 2026-09-02 |
| Dr. Jeffrey R. Jay, M.D. | 0 | 450,000 | 0 | 450,000 | SCHEDULE 13G, 2026-09-02 |
| Ms. Lillian Nordahl | 0 | 450,000 | 0 | 450,000 | SCHEDULE 13G, 2026-09-02 |
| Commodore Capital LP | 0 | 400,000 | 0 | 400,000 | SCHEDULE 13G, 2026-09-02 |
| Commodore Capital Master LP | 0 | 400,000 | 0 | 400,000 | SCHEDULE 13G, 2026-09-02 |
| Robert Egen Atkinson | 0 | 400,000 | 0 | 400,000 | SCHEDULE 13G, 2026-09-02 |
| Michael Kramarz | 0 | 400,000 | 0 | 400,000 | SCHEDULE 13G, 2026-09-02 |
| RA Capital Management, L.P. | 0 | 450,000 | 0 | 450,000 | SCHEDULE 13G, 2026-09-03 |
| Peter Kolchinsky | 0 | 450,000 | 0 | 450,000 | SCHEDULE 13G, 2026-09-03 |
| Rajeev Shah | 0 | 450,000 | 0 | 450,000 | SCHEDULE 13G, 2026-09-03 |
| RA Capital Healthcare Fund, L.P. | 0 | 450,000 | 0 | 450,000 | SCHEDULE 13G, 2026-09-03 |
The latest filing identifies JATT III Acquisition Corp by CUSIP G5080G109 and gives its principal executive office as 153 Central Avenue, C/O 56, Westfield, NJ 07091 (SCHEDULE 13D, 2026-09-03).
What the percentages are based on
Row 11 of each Reporting Person's cover page to this Schedule 13G sets forth the percentages of ordinary shares of the Issuer beneficially owned by such Reporting Person and is incorporated herein by reference.RA Capital Management, L.P., SCHEDULE 13G, 2026-09-03
Source of funds (Item 3)
The source of the funds used by the reporting persons to acquire the ordinary shares reported on this Schedule 13D was working capital. See also Item 4 of this Schedule 13D, which information is incorporated herein by reference.JATT Ventures III L.P., SCHEDULE 13D, 2026-09-03
Purpose of Transaction (Item 4)
JATT Ventures III L.P.
On June 9, 2026, our Sponsor paid $25,000 to cover certain offering costs in exchange for 2,156,250 ordinary shares (the "Founder Shares"). On July 6, 2026, our sponsor forfeited 431,250 Founder Shares. As a result, our sponsor currently holds 1,725,000 ordinary shares. On August 27, 2026, the Issuer consummated its initial public offering ("IPO") and in connection with the consummation of the IPO, Sponsor purchased an aggregate of 234,000 ordinary shares for an aggregate purchase price of $2,340,000. The reporting persons made the acquisitions reported in this Schedule 13D as sponsor and officer and director of the Issuer and in support of the Issuer's business plan. The reporting persons may acquire or dispose of additional securities or sell securities of the Issuer from time to time in the market or in private transactions, including as a result of ownership of the rights referred to above. However, the reporting persons do not have any other agreements to acquire additional ordinary shares at this time. As Chairman and Chief Executive Officers of the Issuer, Dr. Sidhu is involved in making material business decisions regarding the Issuer's policies and practices and may be involved in the consideration of various proposals considered by the Issuer's board of directors. Additionally, as the Issuer's business plan is to enter into a business combination, Dr. Sidhu, as Chairman and Chief Executive Officers of the Issuer, is actively involved in pursuing a suitable target …The first part of Item 4 of the SCHEDULE 13D filed 2026-09-03; the filing has the rest
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2026-09-02 | Deep Track Capital, LP | 5.83% | SCHEDULE 13G |
| 2026-09-02 | Great Point Partners, LLC | 5.83% | SCHEDULE 13G |
| 2026-09-02 | Commodore Capital LP | 5.2% | SCHEDULE 13G |
| 2026-09-03 | JATT Ventures III L.P. | 22.1% | SCHEDULE 13D |
| 2026-09-03 | RA Capital Management, L.P. | 5.1% | SCHEDULE 13G |
Questions about who owns JATT III Acquisition Corp
Who owns JATT III Acquisition Corp?
On this page, 5 holders' latest ownership filings report 5% or more of JATT III Acquisition Corp: JATT Ventures III L.P. (22.1%, Schedule 13D, filed 2026-09-03), Deep Track Capital, LP (5.83%, Schedule 13G, filed 2026-09-02), Great Point Partners, LLC (5.83%, Schedule 13G, filed 2026-09-02), Commodore Capital LP (5.2%, Schedule 13G, filed 2026-09-02) and RA Capital Management, L.P. (5.1%, Schedule 13G, filed 2026-09-03).
Who are the largest shareholders of JATT III Acquisition Corp?
By the share each holder's latest filing reports, the largest holders of JATT III Acquisition Corp on this page are JATT Ventures III L.P. (22.1%), Deep Track Capital, LP (5.83%) and Great Point Partners, LLC (5.83%).
When did JATT Ventures III L.P. buy into JATT III Acquisition Corp?
The filings give report dates, not purchase dates. The earliest filing from JATT Ventures III L.P. on this page is the Schedule 13D, filed 2026-09-03, reporting 22.1%.
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%); 5 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 JATT III Acquisition Corp
| Date | Record | Figure | Our page | Source |
|---|---|---|---|---|
| August 31, 2026 | Leadership change filing (Form 8-K, Item 5.02) | — | Leadership changes | Source |
| August 26, 2026 | IPO filing, Form 424B4 | $10 a share | IPO filings | Source |
| August 10, 2026 | IPO filing, Form S-1 | — | IPO filings | 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.