Archimedes Tech Spac PartnerATII
13F holders, Q3 2025 (September 30)At the end of Q3 2025, 46 institutions reported holding Archimedes Tech Spac Partner (ATII) in their 13F filings, up 4 from Q2 2025. 4 opened new positions and 0 sold out. The largest holders were TENOR CAPITAL MANAGEMENT Co., L.P. ($15.3M), Magnetar Financial LLC ($13.3M) and D. E. Shaw & Co. ($11.6M). 2 famous investors held it, including David E. Shaw (0.0% of D. E. Shaw & Co.'s portfolio) and Israel Englander (0.0% of Millennium Management's portfolio).
- Company
- Archimedes Tech Spac Partner
- CUSIP
- G04537109
- Latest filing quarter
- Q2 2026
History
Number of 13F holders
Total Exit/New Position Q2 2025 → Q3 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 4 | $9.5M |
| Exits | 0 | $0 |
All 13F filers, Q2 2025 → Q3 2025: 2,217,406 shares bought and 1,316,646 shares sold, net +900,760 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 46 holders
| TENOR CAPITAL MANAGEMENT Co., L.P. | 1.66% | No change | 1,500,000 | $15.3M |
| Magnetar Financial LLC | 0.09% | No change | 1,300,000 | $13.3M |
| D. E. Shaw & Co. | 0.01% | No change | 1,138,500 | $11.6M |
| Linden Advisors LP | 0.97% | No change | 1,000,000 | $10.2M |
| AQR Arbitrage LLC | 0.35% | Reduce -0.5% | 964,382 | $9.8M |
| Westchester Capital Management, LLC | 0.48% | Add +38.5% | 900,000 | $9.2M |
| Glazer Capital, LLC | 0.33% | No change | 875,087 | $8.9M |
| LMR Partners LLP | 0.17% | No change | 850,000 | $8.7M |
| Ghisallo Capital Management LLC | 0.27% | No change | 800,000 | $8.2M |
| Governors Lane LP | 1.07% | No change | 750,000 | $7.7M |
| Alberta Investment Management Corp | 0.06% | No change | 750,000 | $7.7M |
| Sculptor Capital LP | 0.17% | Reduce -43.1% | 740,000 | $7.6M |
| Two Sigma Investments, LP | 0.01% | No change | 725,000 | $7.4M |
| Hudson Bay Capital Management LP | 0.05% | No change | 700,000 | $7.2M |
| Meteora Capital, LLC | 0.73% | Add +65.6% | 649,900 | $6.6M |
| Radcliffe Capital Management, L.P. | 1.28% | Add +87.1% | 611,522 | $6.3M |
| Driehaus Capital Management LLC | 0.04% | Reduce -13.7% | 573,083 | $5.9M |
| Picton Mahoney Asset Management | 0.07% | No change | 500,000 | $5.1M |
| Periscope Capital Inc. | 1.30% | Add +11.1% | 500,000 | $5.1M |
| Jain Global LLC | 0.07% | No change | 500,000 | $5.1M |
| Wolverine Asset Management LLC | 0.33% | Add +2913.8% | 456,326 | $4.7M |
| Moore Capital Management, LP | 0.09% | No change | 450,000 | $4.6M |
| Commonwealth of Pennsylvania Public School Empls Retrmt SYS | 0.02% | No change | 400,000 | $4.1M |
| Rivernorth Capital Management, LLC | 0.21% | New | 357,750 | $3.7M |
| Mizuho Securities USA LLC | 0.07% | Reduce -26.4% | 335,098 | $3.4M |
| Goldman Sachs Group Inc. | 0.00% | No change | 323,854 | $3.3M |
| Millennium Management | 0.00% | New | 303,965 | $3.1M |
| Mint Tower Capital Management B.V. | 0.75% | No change | 300,000 | $3.1M |
| Centiva Capital, LP | 0.27% | No change | 285,515 | $2.9M |
| Verition Fund Management LLC | 0.02% | Reduce 0.0% | 251,470 | $2.6M |
| Whitebox Advisors LLC | 0.17% | No change | 250,000 | $2.6M |
| Aristeia Capital, L.L.C. | 0.13% | No change | 250,000 | $2.6M |
| Berkley W R Corp. | 0.15% | No change | 228,206 | $2.3M |
| Schonfeld Strategic Advisors LLC | 0.02% | Reduce -30.7% | 221,665 | $2.3M |
| OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) | 0.07% | No change | 200,000 | $2.0M |
| Shaolin Capital Management LLC | 0.39% | No change | 200,000 | $2.0M |
| DLD Asset Management, LP | 0.64% | Reduce -50.0% | 150,000 | $1.5M |
| Toronto Dominion Bank | 0.00% | Reduce -62.0% | 150,000 | $1.5M |
| Readystate Asset Management LP | 0.15% | New | 147,534 | $1.5M |
| MMCAP International Inc. SPC | 0.15% | New | 125,000 | $1.3M |
| K2 Principal Fund, L.P. | 0.42% | Reduce -29.0% | 113,670 | $1.2M |
| Gritstone Asset Management LLC | 1.07% | Reduce -0.9% | 99,081 | $1.0M |
| CSS LLC | 0.09% | No change | 50,000 | $511K |
| Clear Street Group Inc. | 0.00% | — | 29,195 | $298K |
| Warberg Asset Management LLC | 0.37% | No change | 10,000 | $102K |
| Morgan Stanley | 0.00% | Reduce -57.9% | 51 | $521 |
"% of holder's portfolio" is ATII's weight in each manager's 13F, not the share of Archimedes Tech Spac Partner the manager owns.