JATT · JATT II Acquisition Corp. · Shareholders & Ownership
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Every disclosed holder of JATT in one list: 13F institutions, Schedule 13D and 13G filers, insiders (Forms 3, 4 and 5) and registered funds, each from its own latest filing. Holders nest by CIK and SEC reporting links, never by name, and each is summed once.
Who Owns JATT
13F quarter Sep 30, 2026, combined view: filers that have not filed yet carry their Jun 30, 2026 positionsNo chart: the summed disclosures exceed shares outstanding, so they are not parts of one whole.
| Holder group | Shares | % Out |
|---|---|---|
| Institutional (13F) | 5,452,803 | 69.91% |
| Insiders (Forms 3, 4, 5) | 3,750,000 | 48.08% |
| 13D/G-only blocks | 0 | 0.00% |
| Remaining | 1,402,803 | -17.98% |
| Registered funds (N-PORT, not summed) | 0 | 0.00% |
Shares outstanding: 7,800,000, the issuer's latest cover-page count restated onto today's split basis.
Remaining is negative: the summed disclosures exceed shares outstanding, as when filings are dated at different times or holders that do not disclose their links count the same shares. It is flagged, not clipped.
13D/G-only counts each filer's latest 13D or 13G that no 13F report of the listing contains, that names no 13F filer and that no counted insider files. Funds are never summed: their shares sit inside their advisers' 13F reports.
Holders of JATT
| # | Holder | Shares | As of | Notes |
|---|---|---|---|---|
| 1 |
|
1,800,000 | ||
| 1.1 |
|
1,800,000 | ||
| 2 |
|
1,800,000 | ||
| 3 |
Balyasny Asset Management L.P.
13F
CIK 1218710 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
500,000 | ||
| 3.1 |
Balyasny Asset Management L.P.
13G
CIK 1218710 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
|
500,000 | ||
| 4 |
GREAT POINT PARTNERS LLC
13F
CIK 1281446 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
500,000 | ||
| 4.1 |
GREAT POINT PARTNERS LLC
13G
CIK 1281446 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(c), passive investor, not summed
|
500,000 | ||
| 5 |
Jupiter Topco LLC
13F
CIK 2146052 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
500,000 | ||
| 5.1 |
JANUS HENDERSON GROUP PLC
13G
CIK 1274173 · Investment adviser · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
|
500,000 | ||
| 6 |
RA CAPITAL MANAGEMENT, L.P.
13F
CIK 1346824 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
500,000 | ||
| 7 |
ADAR1 Capital Management, LLC
13F
CIK 1940272 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
417,724 | ||
| 7.1 |
ADAR1 Capital Management, LLC
13G
CIK 1940272 · Registered investment adviser · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
|
417,724 | ||
| 8 |
Atika Capital Management LLC
13G
CIK 1599731 · Unknown · Jun 30, 2026
Rule 13d-1(b), qualified institution, not summed
|
400,000 | ||
| 8.1 |
Atika Capital Management LLC
13F
CIK 1599731 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
400,000 | ||
| 9 |
FRANKLIN RESOURCES INC
13F
CIK 38777 · Investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
400,000 | ||
| 10 |
CITADEL ADVISORS LLC
13F
CIK 1423053 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
319,986 | ||
| 11 |
FARALLON CAPITAL MANAGEMENT LLC
13F
CIK 909661 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
300,000 | ||
| 12 |
BRAIDWELL LP
13F
CIK 1920938 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
250,000 | ||
| 13 |
Nantahala Capital Management, LLC
13F
CIK 1472322 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
225,000 | ||
| 14 |
Affinity Asset Advisors, LLC
13F
CIK 1773195 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
200,000 | ||
| 15 |
TCG Crossover Management, LLC
13F
CIK 1839948 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
200,000 | ||
| 16 |
Spruce Street Capital LP
13F
CIK 2050194 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
160,000 | ||
| 17 |
MILLENNIUM MANAGEMENT LLC
13F
CIK 1273087 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
159,683 | ||
| 18 |
Logos Global Management LP
13F
CIK 1792126 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
100,000 | ||
| 19 |
TWO SIGMA INVESTMENTS, LP
13F
CIK 1179392 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
96,165 | ||
| 20 |
TORONTO DOMINION BANK
13F
CIK 947263 · Bank · Jun 30, 2026
carried, not yet filed for the newest quarter
|
50,500 | ||
| 21 |
|
50,000 | ||
| 22 |
Woodline Partners LP
13F
CIK 1784547 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
50,000 | ||
| 23 |
Magnetar Financial LLC
13F
CIK 1352851 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
47,908 | ||
| 24 |
683 Capital Management, LLC
13F
CIK 1404574 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
42,264 | ||
| 25 |
|
25,000 | ||
| 26 |
|
25,000 | ||
| 27 |
|
25,000 | ||
| 28 |
|
25,000 | ||
| 29 |
FNY Investment Advisers, LLC
13F
CIK 1742998 · Unknown · Sep 30, 2026
|
15,121 | ||
| 30 |
DIADEMA PARTNERS LP
13F
CIK 2026172 · Registered investment adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
9,021 | ||
| 31 |
Clear Street Group Inc.
13F
CIK 1881567 · Unknown · Jun 30, 2026
carried, not yet filed for the newest quarter
|
7,123 | ||
| 32 |
Persistent Asset Partners Ltd
13F
CIK 2056052 · Exempt reporting adviser · Jun 30, 2026
carried, not yet filed for the newest quarter
|
2,300 | ||
| 33 |
MORGAN STANLEY
13F
CIK 895421 · Holding company · Jun 30, 2026
carried, not yet filed for the newest quarter
|
8 |
Shares are restated onto today's split basis. Change compares each row with the same holder's previous filing in the same source; a dash means there is none to compare. Nested 13D/G, insider and fund rows are not summed, since a 13F report already holds them.