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
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| JATT Ventures II L.P. | 23.1% | 1,800,000 | SCHEDULE 13D/A, 2026-09-18 | 2026-04-20 |
| RA Capital Management, L.P. | 6.4% | 500,000 | SCHEDULE 13G, 2026-04-27 | 2026-04-20 |
| Great Point Partners, LLC | 6.23% | 500,000 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
| Balyasny Asset Management L.P. | 6.23% | 500,000 | SCHEDULE 13G, 2026-08-14 | 2026-06-30 |
| JANUS HENDERSON GROUP Ltd. | 6.2% | 500,000 | SCHEDULE 13G, 2026-08-13 | 2026-06-30 |
| ADAR1 Capital Management, LLC | 5.4% | 417,724 | SCHEDULE 13G, 2026-08-14 | 2026-06-30 |
| Atika Capital Management LLC | 5.1% | 400,000 | SCHEDULE 13G, 2026-08-14 | 2026-06-30 |
| Commodore Capital LP | 0% | 0 | SCHEDULE 13G/A, 2026-08-14 | 2026-06-30 |
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
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2026-04-24 | Great Point Partners, LLC | 6.41% | SCHEDULE 13G |
| 2026-04-24 | Commodore Capital LP | 6.4% | SCHEDULE 13G |
| 2026-04-27 | RA Capital Management, L.P. | 6.4% | SCHEDULE 13G |
| 2026-08-13 | JANUS HENDERSON GROUP Ltd. | 6.2% | SCHEDULE 13G |
| 2026-08-14 | Atika Capital Management LLC | 5.1% | SCHEDULE 13G |
| 2026-08-14 | ADAR1 Capital Management, LLC | 5.4% | SCHEDULE 13G |
| 2026-08-14 | Balyasny Asset Management L.P. | 6.23% | SCHEDULE 13G |
| 2026-08-14 | Great Point Partners, LLC | 6.23% | SCHEDULE 13G/A |
| 2026-08-14 | Commodore Capital LP | 0% | SCHEDULE 13G/A |
| 2026-09-15 | JATT Ventures II L.P. | 23.1% | SCHEDULE 13D |
| 2026-09-18 | JATT Ventures II L.P. | 23.1% | SCHEDULE 13D/A |
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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.