JATT II Acquisition Corp.
JATT- Exchange
- Nasdaq
- Industry
- Blank Checks
- SEC CIK
- 0002112446
No open-market purchases or sales by JATT II Acquisition Corp. insiders were filed in the last 90 days; 25 institutions reported holding it in 13F filings for Q2 2026, worth $61.7M in total; no superinvestor holds it.
Holders of 5% or more of JATT
Holders whose latest Schedule 13D or 13G filing reports 5% or more of JATT II Acquisition Corp., largest stake first. The change is against the holder's previous filing.
| Holder | Latest form | Stake | Change | First filed | Latest filing | Filing |
|---|---|---|---|---|---|---|
| JATT Ventures II L.P. | 13D/A | 23.10%1.80M shares | 0.00 ppfrom 23.10% | Sep 15, 20262 filings | Sep 18, 2026 | SEC |
| Ra Capital Management, L.P. | 13G | 6.40%500.0K shares | New | Apr 27, 20261 filing | Apr 27, 2026 | SEC |
| Great Point Partners LLC | 13G/A | 6.23%500.0K shares | −0.18 ppfrom 6.41% | Apr 24, 20262 filings | Aug 14, 2026 | SEC |
| Balyasny Asset Management LLC | 13G | 6.23%500.0K shares | New | Aug 14, 20261 filing | Aug 14, 2026 | SEC |
| Janus Henderson Group PLC | 13G | 6.20%500.0K shares | New | Aug 13, 20261 filing | Aug 13, 2026 | SEC |
| ADAR1 Capital Management, LLC | 13G | 5.40%417.7K shares | New | Aug 14, 20261 filing | Aug 14, 2026 | SEC |
| Atika Capital Management LLC | 13G | 5.10%400.0K shares | New | Aug 14, 20261 filing | Aug 14, 2026 | SEC |
Stakes are as of each holder's latest filing. Holders whose last filing was in the old format (before December 18, 2024) have no stake on record and are not listed, and after an acquisition or delisting holders usually stop filing.
13D and 13G filings
11 Schedule 13D and 13G filings on JATT II Acquisition Corp., newest first, including old-format filings without a stake.
| Filed (ET) | Filer | Form | Stake | Change | Event date | Filing |
|---|---|---|---|---|---|---|
| Sep 18, 20267:26 PM ET | JATT Ventures II L.P.and 1 other | 13D/A | 23.10%1.80M shares | 0.00 ppfrom 23.10% | Apr 20, 2026 | SEC |
| Sep 15, 20268:37 PM ET | JATT Ventures II L.P.and 1 other | 13D | 23.10%1.80M shares | New | Apr 20, 2026 | SEC |
| Aug 14, 20269:30 PM ET | ADAR1 Capital Management, LLCand 1 other | 13G | 5.40%417.7K shares | New | Jun 30, 2026 | SEC |
| Aug 14, 20264:29 PM ET | Commodore Capital LPand 3 others | 13G/A | 0.00%0 shares | −6.40 ppfrom 6.40%Below 5% | Jun 30, 2026 | SEC |
| Aug 14, 20269:34 AM ET | Great Point Partners LLCand 2 others | 13G/A | 6.23%500.0K shares | −0.18 ppfrom 6.41% | Jun 30, 2026 | SEC |
| Aug 14, 20267:32 AM ET | Atika Capital Management LLCand 1 other | 13G | 5.10%400.0K shares | New | Jun 30, 2026 | SEC |
| Aug 14, 20266:04 AM ET | Balyasny Asset Management LLCand 4 others | 13G | 6.23%500.0K shares | New | Jun 30, 2026 | SEC |
| Aug 13, 202612:30 PM ET | Janus Henderson Group PLC | 13G | 6.20%500.0K shares | New | Jun 30, 2026 | SEC |
| Apr 27, 20264:46 PM ET | Ra Capital Management, L.P.and 3 others | 13G | 6.40%500.0K shares | New | Apr 20, 2026 | SEC |
| Apr 24, 20264:48 PM ET | Commodore Capital LPand 3 others | 13G | 6.40%500.0K shares | New | Apr 17, 2026 | SEC |
| Apr 24, 20264:21 PM ET | Great Point Partners LLCand 2 others | 13G | 6.41%500.0K shares | New | Apr 17, 2026 | SEC |
Form 144: proposed insider sales
Notices from officers, directors and other affiliates planning to sell JATT II Acquisition Corp. shares.
No Form 144 notices for JATT II Acquisition Corp. are on file.