Archimedes Tech Spac PartnerATII
13F holders, Q1 2026 (March 31)At the end of Q1 2026, 54 institutions reported holding Archimedes Tech Spac Partner (ATII) in their 13F filings, up 5 from Q4 2025. 7 opened new positions and 3 sold out. The largest holders were TENOR CAPITAL MANAGEMENT Co., L.P. ($15.6M), Magnetar Financial LLC ($13.6M) and D. E. Shaw & Co. ($11.9M). 3 famous investors held it, including David E. Shaw (0.0% of D. E. Shaw & Co.'s portfolio), Israel Englander (0.0% of Millennium Management's portfolio) and Ken Griffin (0.0% of Citadel Advisors's portfolio).
- Company
- Archimedes Tech Spac Partner
- CUSIP
- G04537109
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q4 2025 → Q1 2026
| Institutions | Total Value | |
|---|---|---|
| New Positions | 7 | $9.0M |
| Exits | 3 | $6.6M |
All 13F filers, Q4 2025 → Q1 2026: 1,445,587 shares bought and 1,905,641 shares sold, net −460,054 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 54 holders
| TENOR CAPITAL MANAGEMENT Co., L.P. | 1.06% | No change | 1,500,000 | $15.6M |
| Magnetar Financial LLC | 0.15% | No change | 1,300,000 | $13.6M |
| D. E. Shaw & Co. | 0.01% | No change | 1,138,500 | $11.9M |
| Linden Advisors LP | 0.61% | No change | 1,000,000 | $10.4M |
| AQR Arbitrage LLC | 0.19% | Reduce -4.5% | 920,672 | $9.6M |
| Westchester Capital Management, LLC | 0.46% | No change | 907,144 | $9.4M |
| LMR Partners LLP | 0.11% | No change | 850,000 | $8.8M |
| Ghisallo Capital Management LLC | 0.23% | No change | 800,000 | $8.3M |
| Governors Lane LP | 0.99% | Add +0.1% | 759,556 | $7.9M |
| Alberta Investment Management Corp | 0.05% | No change | 750,000 | $7.8M |
| Glazer Capital, LLC | 0.17% | Reduce -13.2% | 750,000 | $7.8M |
| Two Sigma Investments, LP | 0.01% | No change | 725,000 | $7.5M |
| Hudson Bay Capital Management LP | 0.05% | No change | 700,000 | $7.3M |
| Radcliffe Capital Management, L.P. | 0.78% | Add +0.5% | 661,337 | $6.9M |
| Toronto Dominion Bank | 0.01% | Add +333.3% | 650,000 | $6.8M |
| Sculptor Capital LP | 0.15% | No change | 600,646 | $6.3M |
| Jain Global LLC | 0.07% | No change | 500,000 | $5.2M |
| Picton Mahoney Asset Management | 0.05% | No change | 500,000 | $5.2M |
| Moore Capital Management, LP | 0.19% | No change | 450,000 | $4.7M |
| Rivernorth Capital Management, LLC | 0.22% | Reduce -4.5% | 427,500 | $4.5M |
| RLH Capital LLC | 2.13% | — | 400,907 | $4.2M |
| Commonwealth of Pennsylvania Public School Empls Retrmt SYS | 0.02% | No change | 400,000 | $4.2M |
| J. Goldman & Co LP | 0.18% | New | 369,778 | $3.8M |
| Periscope Capital Inc. | 0.67% | Reduce -21.3% | 352,880 | $3.7M |
| Goldman Sachs Group Inc. | 0.00% | Add +1.1% | 327,450 | $3.4M |
| Millennium Management | 0.00% | No change | 307,985 | $3.2M |
| Mint Tower Capital Management B.V. | 0.68% | No change | 300,000 | $3.1M |
| Meteora Capital, LLC | 0.23% | Reduce -58.9% | 295,612 | $3.1M |
| Centiva Capital, LP | 0.14% | No change | 285,515 | $3.0M |
| Quarry LP | 0.62% | New | 285,000 | $3.0M |
| Shaolin Capital Management LLC | 0.31% | No change | 270,783 | $2.8M |
| Whitebox Advisors LLC | 0.14% | No change | 250,000 | $2.6M |
| Aristeia Capital, L.L.C. | 0.10% | No change | 250,000 | $2.6M |
| Verition Fund Management LLC | 0.02% | No change | 231,470 | $2.4M |
| Berkley W R Corp. | 0.12% | Reduce -8.8% | 208,065 | $2.2M |
| O'Connor Alternative Investments LLC | 0.12% | — | 200,000 | $2.1M |
| L1 Global Manager Pty Ltd | 1.68% | No change | 200,000 | $2.1M |
| Schonfeld Strategic Advisors LLC | 0.01% | No change | 173,515 | $1.8M |
| DLD Asset Management, LP | 0.47% | Reduce -25.0% | 150,000 | $1.6M |
| Readystate Asset Management LP | 0.16% | Add +0.8% | 148,734 | $1.6M |
| Wolverine Asset Management LLC | 0.07% | Reduce -62.2% | 134,280 | $1.4M |
| MMCAP International Inc. SPC | 0.11% | No change | 125,000 | $1.3M |
| Gritstone Asset Management LLC | 1.12% | No change | 99,081 | $1.0M |
| Lineage Point Capital LP | 0.25% | New | 95,895 | $1.0M |
| K2 Principal Fund, L.P. | 0.28% | No change | 87,900 | $915K |
| Baird Financial Group, Inc. | 0.00% | No change | 78,500 | $819K |
| Clear Street Group Inc. | 0.00% | Add +1746.3% | 77,452 | $806K |
| CSS LLC | 0.09% | No change | 57,143 | $595K |
| Virtu Financial LLC | 0.02% | New | 53,686 | $561K |
| BNP Paribas Financial Markets | 0.00% | New | 37,744 | $393K |
| Mizuho Securities USA LLC | 0.00% | Reduce -93.6% | 19,469 | $202K |
| Geode Capital Management, LLC | 0.00% | New | 11,102 | $116K |
| Citadel Advisors | 0.00% | New | 10,377 | $108K |
| Morgan Stanley | 0.00% | Reduce -52.3% | 62 | $645 |
"% of holder's portfolio" is ATII's weight in each manager's 13F, not the share of Archimedes Tech Spac Partner the manager owns.