Archimedes Tech SPAC Partners II Co.
ATII- Exchange
- Nasdaq
- Industry
- Blank Checks
- SEC CIK
- 0002028516
No open-market purchases or sales by Archimedes Tech SPAC Partners II Co. insiders were filed in the last 90 days; 50 institutions reported holding it in 13F filings for Q2 2026, worth $189.6M in total; no superinvestor holds it.
13F holders, Q4 2025
Institutional positions in Archimedes Tech SPAC Partners II Co. as of Dec 31, 2025. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 49
- +3 vs. Q3 2025
- Shares held
- 22.2M
- +229.0K (+1.0%) vs. Q3 2025
- Total value
- $230.4M
- +$5.47M (+2.4%) vs. Q3 2025
- New holders
- 3
- 11 more added
- Sold out
- 0
- 9 more reduced
Compare with Q3 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting ATII on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 50 | $189.6M |
| Q1 2026 | 54 | $231.3M |
| Q4 2025 | 49 | $230.4M |
| Q3 2025 | 46 | $225.0M |
| Q2 2025 | 42 | $216.0M |
| Q1 2025 | 0 | $0 |
| Q4 2024 | 0 | $0 |
| Q3 2024 | 0 | $0 |
| Q2 2024 | 0 | $0 |
| Q1 2024 | 0 | $0 |
| Q4 2023 | 0 | $0 |
| Q3 2023 | 0 | $0 |
| Q2 2023 | 0 | $0 |
| Q1 2023 | 0 | $0 |
| Q4 2022 | 0 | $0 |
| Q3 2022 | 0 | $0 |
| Q2 2022 | 0 | $0 |
| Q1 2022 | 0 | $0 |
| Q4 2021 | 0 | $0 |
| Q3 2021 | 0 | $0 |
| Q2 2021 | 0 | $0 |
| Q1 2021 | 0 | $0 |
Institutions, Q4 2025
Shares, value and share of portfolio for each institution holding Archimedes Tech SPAC Partners II Co.; share changes are against Q3 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Tenor Capital Management Co., L.P. | 1,500,000 | $15.5M | 0.22% | 00.0% | Unchanged |
| Magnetar Financial LLC | 1,300,000 | $13.5M | 0.13% | 00.0% | Unchanged |
| D. E. Shaw & Co., Inc. | 1,138,500 | $11.8M | 0.01% | 00.0% | Unchanged |
| Linden Advisors LP | 1,000,000 | $10.4M | 0.06% | 00.0% | Unchanged |
| CNH Partners LLC | 964,382 | $9.99M | 0.21% | 00.0% | Unchanged |
| Westchester Capital Management, LLC | 907,144 | $9.40M | 0.44% | +7,144+0.8% | Added |
| Glazer Capital, LLC | 864,303 | $8.95M | 0.24% | −10,784−1.2% | Reduced |
| LMR Partners LLP | 850,000 | $8.81M | 0.08% | 00.0% | Unchanged |
| Ghisallo Capital Management LLC | 800,000 | $8.29M | 0.37% | 00.0% | Unchanged |
| Governors Lane LP | 758,617 | $7.86M | 0.73% | +8,617+1.1% | Added |
| Alberta Investment Management Corp | 750,000 | $7.77M | 0.05% | 00.0% | Unchanged |
| Two Sigma Investments, LP | 725,000 | $7.51M | 0.01% | 00.0% | Unchanged |
| Meteora Capital, LLC | 718,433 | $7.44M | 0.62% | +68,533+10.5% | Added |
| Hudson Bay Capital Management LP | 700,000 | $7.25M | 0.04% | 00.0% | Unchanged |
| Radcliffe Capital Management, L.P. | 658,322 | $6.82M | 0.37% | +46,800+7.7% | Added |
| Sculptor Capital LP | 600,646 | $6.22M | 0.07% | −139,354−18.8% | Reduced |
| Driehaus Capital Management LLC | 573,083 | $5.94M | 0.04% | 00.0% | Unchanged |
| Picton Mahoney Asset Management | 500,000 | $5.18M | 0.06% | 00.0% | Unchanged |
| Jain Global LLC | 500,000 | $5.18M | 0.05% | 00.0% | Unchanged |
| Moore Capital Management, LP | 450,000 | $4.66M | 0.10% | 00.0% | Unchanged |
| Periscope Capital Inc. | 448,100 | $4.64M | 0.90% | −51,900−10.4% | Reduced |
| Rivernorth Capital Management, LLC | 447,750 | $4.64M | 0.22% | +90,000+25.2% | Added |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 400,000 | $4.14M | 0.02% | 00.0% | Unchanged |
| Wolverine Asset Management LLC | 355,354 | $3.68M | 0.05% | −100,972−22.1% | Reduced |
| Goldman Sachs Group Inc | 323,854 | $3.36M | 0.00% | 00.0% | Unchanged |
| Millennium Management LLC | 307,985 | $3.19M | 0.00% | +4,020+1.3% | Added |
| Mizuho Securities USA LLC | 303,827 | $3.11M | 0.05% | −31,271−9.3% | Reduced |
| Mint Tower Capital Management B.V. | 300,000 | $3.11M | 0.39% | 00.0% | Unchanged |
| Centiva Capital, LP | 285,515 | $2.96M | 0.18% | 00.0% | Unchanged |
| Shaolin Capital Management LLC | 270,783 | $2.81M | 0.11% | +70,783+35.4% | Added |
| Aristeia Capital LLC | 250,000 | $2.59M | 0.07% | 00.0% | Unchanged |
| Whitebox Advisors LLC | 250,000 | $2.59M | 0.04% | 00.0% | Unchanged |
| Verition Fund Management LLC | 231,470 | $2.40M | 0.01% | −20,000−8.0% | Reduced |
| Berkley W R Corp | 228,206 | $2.36M | 0.13% | 00.0% | Unchanged |
| UBS Oconnor LLC | 200,000 | $2.07M | 0.06% | 00.0% | Unchanged |
| DLD Asset Management, LP | 200,000 | $2.07M | 0.22% | +50,000+33.3% | Added |
| L1 Global Manager Pty Ltd | 200,000 | $2.07M | 1.36% | +200,000 | New |
| Schonfeld Strategic Advisors LLC | 173,515 | $1.80M | 0.01% | −48,150−21.7% | Reduced |
| Toronto Dominion Bank | 150,002 | $1.55M | 0.00% | +20.0% | Added |
| Readystate Asset Management LP | 147,534 | $1.53M | 0.07% | 00.0% | Unchanged |
| MMCAP International Inc. SPC | 125,000 | $1.29M | 0.13% | 00.0% | Unchanged |
| Gritstone Asset Management LLC | 99,081 | $1.03M | 0.98% | 00.0% | Unchanged |
| K2 Principal Fund, L.P. | 87,900 | $910.6K | 0.09% | −25,770−22.7% | Reduced |
| Baird Financial Group, Inc. | 78,500 | $813.3K | 0.00% | +78,500 | New |
| CSS LLC | 57,143 | $592.0K | 0.03% | +7,143+14.3% | Added |
| StoneX Group Inc. | 50,613 | $524.4K | 0.02% | +50,613 | New |
| Warberg Asset Management LLC | 10,000 | $103.6K | 0.03% | 00.0% | Unchanged |
| Clear Street Group Inc. | 4,195 | $43.5K | 0.00% | −25,000−85.6% | Reduced |
| Morgan Stanley | 130 | $1.35K | 0.00% | +79+154.9% | Added |