Who Owns Archimedes Tech SPAC Partners II Co. (ATIIW)? -- Institutional Holders (2026-03-31)
41 institutions reported holding $6.8M of Archimedes Tech SPAC Partners II Co. (ATIIW) in SEC 13F filings for 2026-03-31. Largest institutional holders: Mint Tower Capital Management B.V. ($1.6M), Harraden Circle Investments, LLC ($820,955), TENOR CAPITAL MANAGEMENT Co., L.P. ($382,500), Linden Advisors LP ($378,823), Magnetar Financial LLC ($331,500). Source: SEC Form 13F.
| Rank | Institution | Value | Shares | Change |
|---|
| 1 | Mint Tower Capital Management B.V. | $1.6M | 150,000 | Hold |
| 2 | Harraden Circle Investments, LLC | $820,955 | 1.6M | Trimmed |
| 3 | TENOR CAPITAL MANAGEMENT Co., L.P. | $382,500 | 750,000 | Hold |
| 4 | Linden Advisors LP | $378,823 | 860,962 | Hold |
| 5 | Magnetar Financial LLC | $331,500 | 650,000 | Hold |
| 6 | TORONTO DOMINION BANK | $282,884 | 554,674 | Added |
| 7 | HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | $255,000 | 500,000 | Hold |
| 8 | Shaolin Capital Management LLC | $255,000 | 500,000 | Hold |
| 9 | CSS LLC/IL | $248,686 | 487,619 | Trimmed |
| 10 | AQR Arbitrage LLC | $244,396 | 479,208 | Trimmed |
| 11 | LMR Partners LLP | $216,750 | 425,000 | Hold |
| 12 | Alberta Investment Management Corp | $191,250 | 375,000 | Hold |
| 13 | D. E. Shaw & Co., Inc. | $146,625 | 287,500 | Hold |
| 14 | MILLENNIUM MANAGEMENT LLC | $127,474 | 249,950 | Hold |
| 15 | K2 PRINCIPAL FUND, L.P. | $122,346 | 239,895 | Hold |
| 16 | MOORE CAPITAL MANAGEMENT, LP | $114,750 | 225,000 | Hold |
| 17 | RIVERNORTH CAPITAL MANAGEMENT, LLC | $114,720 | 224,942 | Hold |
| 18 | Westchester Capital Management, LLC | $101,999 | 199,999 | Hold |
| 19 | Periscope Capital Inc. | $101,286 | 198,600 | Hold |
| 20 | Governors Lane LP | $100,676 | 197,403 | Hold |
| 21 | BNP PARIBAS FINANCIAL MARKETS | $82,583 | 161,927 | Hold |
| 22 | Clear Street Group Inc. | $78,346 | 153,619 | Added |
| 23 | WHITEBOX ADVISORS LLC | $63,750 | 125,000 | Hold |
| 24 | PICTON MAHONEY ASSET MANAGEMENT | $63,750 | 125,000 | Hold |
| 25 | ARISTEIA CAPITAL, L.L.C. | $55,000 | 125,000 | Hold |
Source: SEC Form 13F filings · as of 2026-03-31