JATT II Acquisition Corp.: 5%+ holders

As of November 6, 2026, 7 holders' latest Schedule 13D or 13G filings report owning 5% or more of JATT II Acquisition Corp. The largest reported stake is JATT Ventures II L.P.'s, at 23.1%. 11 filings are on record since April 24, 2026 (Schedule 13D/A, September 18, 2026).

Great Point Partners, LLC also filed stake reports on 14 other companies ↓

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Key facts

• Filing 2026-09-18 · Reporting person: JATT Ventures II L.P. · Sole voting: 1,800,000 · Shared voting: 0 · Sole dispositive: 1,800,000 · Shared dispositive: 0 · SCHEDULE 13D/A, 2026-09-18
• Filed 2026-09-15 · Holder: JATT Ventures II L.P. · Percent: 23.1% · SCHEDULE 13D
• Filing 2026-08-14 · Reporting person: Great Point Partners, LLC · Sole voting: 0 · Shared voting: 500,000 · Sole dispositive: 0 · Shared dispositive: 500,000 · SCHEDULE 13G/A, 2026-08-14
• Filing 2026-08-14 · Reporting person: Balyasny Asset Management L.P. · Sole voting: 500,000 · Shared voting: 0 · Sole dispositive: 500,000 · Shared dispositive: 0 · SCHEDULE 13G, 2026-08-14
• Filing 2026-08-14 · Reporting person: ADAR1 Capital Management, LLC · Sole voting: 0 · Shared voting: 417,724 · Sole dispositive: 0 · Shared dispositive: 417,724 · SCHEDULE 13G, 2026-08-14

JATT II Acquisition Corp. has 11 Schedule 13D or 13G filings on record since 2026-04-24. 7 holders' latest filing reports 5% or more of ordinary shares, $0.0001 par value. Each figure below is the holder's own, as filed, with the filing linked.

Holders

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More on JATT II 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), JATT III Acquisition Corp (Sep 2026)
• ADAR1 Capital Management, LLC also filed stake reports on 29 other companies: InMed Pharmaceuticals, Inc. (Oct 2026), Tenax Therapeutics, Inc. (Sep 2026), Adagio Medical Holdings, Inc. (Aug 2026)
• BALYASNY ASSET MANAGEMENT L.P. also filed stake reports on 31 other companies: Beyond Air, Inc. (Aug 2026), Camp4 Therapeutics Corp. (Aug 2026), CELLECTAR BIOSCIENCES, INC. (Aug 2026)

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What the Full Report on JATT II Acquisition Corp. covers

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3. What They Do, And How The Money Works

4. Who Runs It, And How To Reach Them

5. The Money: Funding, Valuation, Runway

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7. Warning Bells

8. Sources

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Voting and dispositive power, as filed

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The latest filing identifies JATT II Acquisition Corp. by CUSIP G50765109 and gives its principal executive office as 153 Central Avenue, C/O 56, Westfield, NJ 07091 (SCHEDULE 13D/A, 2026-09-18).

What the percentages are based on

Each of the Reporting Persons may be deemed to be the beneficial owner of approximately 6.23% of the Shares, based on 8,025,000 Shares outstanding as of May 28, 2026, as reported in the Issuer's Report on Form 10-Q filed with the Securities and Exchange Commission on May 29, 2026. The report amount consists of 500,000 Shares.Balyasny Asset Management L.P., SCHEDULE 13G, 2026-08-14

Source of funds (Item 3)

The source of the funds used by the reporting persons to acquire the ordinary shares reported on in this Schedule 13D was working capital of the Sponsor. See also Item 4 of this Schedule 13D, which information is incorporated herein by reference.JATT Ventures II L.P., SCHEDULE 13D/A, 2026-09-18

Purpose of Transaction (Item 4)

JATT Ventures II L.P.

On February 12, 2026, the Sponsor paid $25,000, or approximately $0.014 per share, to cover certain of the Issuer's offering costs in exchange for 1,725,000 Founder Shares (the "Founder Shares"), of which 225,000 founder shares were forfeited subject to the expiration of the underwriters' over-allotment option, pursuant to the Securities Subscription Agreement dated as of February 12, 2026 between the Sponsor and the Issuer (the "Founder Share Purchase Agreement"). On April 20, 2026, the Issuer consummated its initial public offering ("IPO") and in connection with the consummation, Sponsor purchased an aggregate of 300,000 private placement shares for an aggregate purchase price of $3,000,000. The reporting persons made the acquisitions reported in this Schedule 13D in support of the Issuer's business plan and for investment purposes. 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 warrants referred to above. However, reporting persons do not have any other agreements to acquire additional ordinary shares at this time. As Chief Executive Officer of the Issuer,Dr. Someit 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 …The first part of Item 4 of the SCHEDULE 13D/A filed 2026-09-18; the filing has the rest

Timeline

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Questions about who owns JATT II Acquisition Corp.

Who owns JATT II Acquisition Corp.?

On this page, 7 holders' latest ownership filings report 5% or more of JATT II Acquisition Corp.: JATT Ventures II L.P. (23.1%, Schedule 13D/A, filed 2026-09-18), RA Capital Management, L.P. (6.4%, Schedule 13G, filed 2026-04-27), Great Point Partners, LLC (6.23%, Schedule 13G/A, filed 2026-08-14), Balyasny Asset Management L.P. (6.23%, Schedule 13G, filed 2026-08-14) and JANUS HENDERSON GROUP Ltd. (6.2%, Schedule 13G, filed 2026-08-13); 2 more are listed above.

Who are the largest shareholders of JATT II Acquisition Corp.?

By the share each holder's latest filing reports, the largest holders of JATT II Acquisition Corp. on this page are JATT Ventures II L.P. (23.1%), RA Capital Management, L.P. (6.4%) and Great Point Partners, LLC (6.23%).

When did JATT Ventures II L.P. buy into JATT II Acquisition Corp.?

The filings give report dates, not purchase dates. The earliest filing from JATT Ventures II L.P. on this page is the Schedule 13D, filed 2026-09-15, reporting 23.1%; its latest, Schedule 13D/A filed 2026-09-18, reports 23.1%.

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%); 11 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.

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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.

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