Archimedes Tech Spac PartnerATII
13F holders, Q4 2025 (December 31)49holders +3
2new positions
0sold out
2famous investors
$10.36avg. 13F price*
At the end of Q4 2025, 49 institutions reported holding Archimedes Tech Spac Partner (ATII) in their 13F filings, up 3 from Q3 2025. 2 opened new positions and 0 sold out. The largest holders were TENOR CAPITAL MANAGEMENT Co., L.P. ($15.5M), Magnetar Financial LLC ($13.5M) and D. E. Shaw & Co. ($11.8M). 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 Q3 2025 → Q4 2025
| Institutions | Total Value | |
|---|---|---|
| New Positions | 2 | $1.3M |
| Exits | 0 | $0 |
All 13F filers, Q3 2025 → Q4 2025: 482,234 shares bought and 453,201 shares sold, net +29,033 shares. Counts holders who added, trimmed, opened or closed a position; split-adjusted.
Ownership 49 holders
| TENOR CAPITAL MANAGEMENT Co., L.P. | 1.31% | No change | 1,500,000 | $15.5M |
| Magnetar Financial LLC | 0.14% | No change | 1,300,000 | $13.5M |
| D. E. Shaw & Co. | 0.01% | No change | 1,138,500 | $11.8M |
| Linden Advisors LP | 0.78% | No change | 1,000,000 | $10.4M |
| AQR Arbitrage LLC | 0.27% | No change | 964,382 | $10.0M |
| Westchester Capital Management, LLC | 0.44% | Add +0.8% | 907,144 | $9.4M |
| Glazer Capital, LLC | 0.26% | Reduce -1.2% | 864,303 | $9.0M |
| LMR Partners LLP | 0.11% | No change | 850,000 | $8.8M |
| Ghisallo Capital Management LLC | 0.37% | No change | 800,000 | $8.3M |
| Governors Lane LP | 0.73% | Add +1.1% | 758,617 | $7.9M |
| Alberta Investment Management Corp | 0.05% | No change | 750,000 | $7.8M |
| Two Sigma Investments, LP | 0.01% | No change | 725,000 | $7.5M |
| Meteora Capital, LLC | 0.64% | Add +10.6% | 718,433 | $7.4M |
| Hudson Bay Capital Management LP | 0.05% | No change | 700,000 | $7.3M |
| Radcliffe Capital Management, L.P. | 0.97% | Add +7.7% | 658,322 | $6.8M |
| Sculptor Capital LP | 0.13% | Reduce -18.8% | 600,646 | $6.2M |
| Driehaus Capital Management LLC | 0.04% | No change | 573,083 | $5.9M |
| Picton Mahoney Asset Management | 0.06% | No change | 500,000 | $5.2M |
| Jain Global LLC | 0.05% | No change | 500,000 | $5.2M |
| Moore Capital Management, LP | 0.10% | No change | 450,000 | $4.7M |
| Periscope Capital Inc. | 0.95% | Reduce -10.4% | 448,100 | $4.6M |
| Rivernorth Capital Management, LLC | 0.22% | Add +25.2% | 447,750 | $4.6M |
| Commonwealth of Pennsylvania Public School Empls Retrmt SYS | 0.02% | No change | 400,000 | $4.1M |
| Wolverine Asset Management LLC | 0.21% | Reduce -22.1% | 355,354 | $3.7M |
| Goldman Sachs Group Inc. | 0.00% | No change | 323,854 | $3.4M |
| Millennium Management | 0.00% | Add +1.3% | 307,985 | $3.2M |
| Mizuho Securities USA LLC | 0.05% | Reduce -9.3% | 303,827 | $3.1M |
| Mint Tower Capital Management B.V. | 0.97% | No change | 300,000 | $3.1M |
| Centiva Capital, LP | 0.18% | No change | 285,515 | $3.0M |
| Shaolin Capital Management LLC | 0.37% | Add +35.4% | 270,783 | $2.8M |
| Whitebox Advisors LLC | 0.16% | No change | 250,000 | $2.6M |
| Aristeia Capital, L.L.C. | 0.13% | No change | 250,000 | $2.6M |
| Verition Fund Management LLC | 0.01% | Reduce -8.0% | 231,470 | $2.4M |
| Berkley W R Corp. | 0.14% | No change | 228,206 | $2.4M |
| L1 Global Manager Pty Ltd | 1.36% | — | 200,000 | $2.1M |
| DLD Asset Management, LP | 0.72% | Add +33.3% | 200,000 | $2.1M |
| OCONNOR, A Distinct Business Unit of UBS ASSET MANAGEMENT AMERICAS (LLC) | 0.06% | No change | 200,000 | $2.1M |
| Schonfeld Strategic Advisors LLC | 0.01% | Reduce -21.7% | 173,515 | $1.8M |
| Toronto Dominion Bank | 0.00% | Add +0.0% | 150,002 | $1.6M |
| Readystate Asset Management LP | 0.12% | No change | 147,534 | $1.5M |
| MMCAP International Inc. SPC | 0.13% | No change | 125,000 | $1.3M |
| Gritstone Asset Management LLC | 1.01% | No change | 99,081 | $1.0M |
| K2 Principal Fund, L.P. | 0.34% | Reduce -22.7% | 87,900 | $911K |
| Baird Financial Group, Inc. | 0.00% | New | 78,500 | $813K |
| CSS LLC | 0.10% | Add +14.3% | 57,143 | $592K |
| StoneX Group Inc. | 0.02% | New | 50,613 | $524K |
| Warberg Asset Management LLC | 0.33% | No change | 10,000 | $104K |
| Clear Street Group Inc. | 0.00% | Reduce -85.6% | 4,195 | $43K |
| Morgan Stanley | 0.00% | Add +154.9% | 130 | $1K |
"% of holder's portfolio" is ATII's weight in each manager's 13F, not the share of Archimedes Tech Spac Partner the manager owns.