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 |
|---|---|---|---|---|---|
| Morgan Stanley | 130 | $1.35K | 0.00% | +79+154.9% | Added |
| Clear Street Group Inc. | 4,195 | $43.5K | 0.00% | −25,000−85.6% | Reduced |
| Warberg Asset Management LLC | 10,000 | $103.6K | 0.03% | 00.0% | Unchanged |
| StoneX Group Inc. | 50,613 | $524.4K | 0.02% | +50,613 | New |
| CSS LLC | 57,143 | $592.0K | 0.03% | +7,143+14.3% | Added |
| Baird Financial Group, Inc. | 78,500 | $813.3K | 0.00% | +78,500 | New |
| K2 Principal Fund, L.P. | 87,900 | $910.6K | 0.09% | −25,770−22.7% | Reduced |
| Gritstone Asset Management LLC | 99,081 | $1.03M | 0.98% | 00.0% | Unchanged |
| MMCAP International Inc. SPC | 125,000 | $1.29M | 0.13% | 00.0% | Unchanged |
| Readystate Asset Management LP | 147,534 | $1.53M | 0.07% | 00.0% | Unchanged |
| Toronto Dominion Bank | 150,002 | $1.55M | 0.00% | +20.0% | Added |
| Schonfeld Strategic Advisors LLC | 173,515 | $1.80M | 0.01% | −48,150−21.7% | Reduced |
| 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 |
| Berkley W R Corp | 228,206 | $2.36M | 0.13% | 00.0% | Unchanged |
| Verition Fund Management LLC | 231,470 | $2.40M | 0.01% | −20,000−8.0% | Reduced |
| Aristeia Capital LLC | 250,000 | $2.59M | 0.07% | 00.0% | Unchanged |
| Whitebox Advisors LLC | 250,000 | $2.59M | 0.04% | 00.0% | Unchanged |
| Shaolin Capital Management LLC | 270,783 | $2.81M | 0.11% | +70,783+35.4% | Added |
| Centiva Capital, LP | 285,515 | $2.96M | 0.18% | 00.0% | Unchanged |
| Mint Tower Capital Management B.V. | 300,000 | $3.11M | 0.39% | 00.0% | Unchanged |
| Mizuho Securities USA LLC | 303,827 | $3.11M | 0.05% | −31,271−9.3% | Reduced |
| Millennium Management LLC | 307,985 | $3.19M | 0.00% | +4,020+1.3% | Added |
| Goldman Sachs Group Inc | 323,854 | $3.36M | 0.00% | 00.0% | Unchanged |
| Wolverine Asset Management LLC | 355,354 | $3.68M | 0.05% | −100,972−22.1% | Reduced |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 400,000 | $4.14M | 0.02% | 00.0% | Unchanged |
| Rivernorth Capital Management, LLC | 447,750 | $4.64M | 0.22% | +90,000+25.2% | Added |
| Periscope Capital Inc. | 448,100 | $4.64M | 0.90% | −51,900−10.4% | Reduced |
| Moore Capital Management, LP | 450,000 | $4.66M | 0.10% | 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 |
| Driehaus Capital Management LLC | 573,083 | $5.94M | 0.04% | 00.0% | Unchanged |
| Sculptor Capital LP | 600,646 | $6.22M | 0.07% | −139,354−18.8% | Reduced |
| Radcliffe Capital Management, L.P. | 658,322 | $6.82M | 0.37% | +46,800+7.7% | Added |
| Hudson Bay Capital Management LP | 700,000 | $7.25M | 0.04% | 00.0% | Unchanged |
| Meteora Capital, LLC | 718,433 | $7.44M | 0.62% | +68,533+10.5% | Added |
| Two Sigma Investments, LP | 725,000 | $7.51M | 0.01% | 00.0% | Unchanged |
| Alberta Investment Management Corp | 750,000 | $7.77M | 0.05% | 00.0% | Unchanged |
| Governors Lane LP | 758,617 | $7.86M | 0.73% | +8,617+1.1% | Added |
| Ghisallo Capital Management LLC | 800,000 | $8.29M | 0.37% | 00.0% | Unchanged |
| LMR Partners LLP | 850,000 | $8.81M | 0.08% | 00.0% | Unchanged |
| Glazer Capital, LLC | 864,303 | $8.95M | 0.24% | −10,784−1.2% | Reduced |
| Westchester Capital Management, LLC | 907,144 | $9.40M | 0.44% | +7,144+0.8% | Added |
| CNH Partners LLC | 964,382 | $9.99M | 0.21% | 00.0% | Unchanged |
| Linden Advisors LP | 1,000,000 | $10.4M | 0.06% | 00.0% | Unchanged |
| D. E. Shaw & Co., Inc. | 1,138,500 | $11.8M | 0.01% | 00.0% | Unchanged |
| Magnetar Financial LLC | 1,300,000 | $13.5M | 0.13% | 00.0% | Unchanged |
| Tenor Capital Management Co., L.P. | 1,500,000 | $15.5M | 0.22% | 00.0% | Unchanged |