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; 51 institutions reported holding it in 13F filings for Q2 2026, worth $190.7M in total; no superinvestor holds it.
13F holders, Q3 2025
Institutional positions in Archimedes Tech SPAC Partners II Co. as of Sep 30, 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
- 46
- +5 vs. Q2 2025
- Shares held
- 22.0M
- +930.0K (+4.4%) vs. Q2 2025
- Total value
- $225.0M
- +$9.36M (+4.3%) vs. Q2 2025
- New holders
- 5
- 5 more added
- Sold out
- 0
- 11 more reduced
1 institution that held it in Q2 2025 haven't filed for Q3 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q2 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 | 51 | $190.7M |
| 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, Q3 2025
Shares, value and share of portfolio for each institution holding Archimedes Tech SPAC Partners II Co.; share changes are against Q2 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Tenor Capital Management Co., L.P. | 1,500,000 | $15.3M | 0.20% | 00.0% | Unchanged |
| Magnetar Financial LLC | 1,300,000 | $13.3M | 0.08% | 00.0% | Unchanged |
| D. E. Shaw & Co., Inc. | 1,138,500 | $11.6M | 0.01% | 00.0% | Unchanged |
| Linden Advisors LP | 1,000,000 | $10.2M | 0.07% | 00.0% | Unchanged |
| CNH Partners LLC | 964,382 | $9.85M | 0.25% | −5,000−0.5% | Reduced |
| Westchester Capital Management, LLC | 900,000 | $9.19M | 0.48% | +250,000+38.5% | Added |
| Glazer Capital, LLC | 875,087 | $8.94M | 0.30% | 00.0% | Unchanged |
| LMR Partners LLP | 850,000 | $8.68M | 0.11% | 00.0% | Unchanged |
| Ghisallo Capital Management LLC | 800,000 | $8.19M | 0.27% | 00.0% | Unchanged |
| Governors Lane LP | 750,000 | $7.68M | 1.06% | 00.0% | Unchanged |
| Alberta Investment Management Corp | 750,000 | $7.67M | 0.06% | 00.0% | Unchanged |
| Sculptor Capital LP | 740,000 | $7.56M | 0.10% | −560,000−43.1% | Reduced |
| Two Sigma Investments, LP | 725,000 | $7.40M | 0.01% | 00.0% | Unchanged |
| Hudson Bay Capital Management LP | 700,000 | $7.15M | 0.04% | 00.0% | Unchanged |
| Meteora Capital, LLC | 649,900 | $6.64M | 0.70% | +257,370+65.6% | Added |
| Radcliffe Capital Management, L.P. | 611,522 | $6.26M | 0.39% | +284,602+87.1% | Added |
| Driehaus Capital Management LLC | 573,083 | $5.85M | 0.04% | −91,215−13.7% | Reduced |
| Picton Mahoney Asset Management | 500,000 | $5.12M | 0.07% | 00.0% | Unchanged |
| Jain Global LLC | 500,000 | $5.12M | 0.07% | 00.0% | Unchanged |
| Periscope Capital Inc. | 500,000 | $5.12M | 1.24% | +50,000+11.1% | Added |
| Wolverine Asset Management LLC | 456,326 | $4.66M | 0.07% | +441,185+2,913.8% | Added |
| Moore Capital Management, LP | 450,000 | $4.59M | 0.09% | 00.0% | Unchanged |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 400,000 | $4.09M | 0.02% | 00.0% | Unchanged |
| Rivernorth Capital Management, LLC | 357,750 | $3.65M | 0.21% | +357,750 | New |
| Mizuho Securities USA LLC | 335,098 | $3.39M | 0.07% | −119,902−26.4% | Reduced |
| Goldman Sachs Group Inc | 323,854 | $3.31M | 0.00% | 00.0% | Unchanged |
| Millennium Management LLC | 303,965 | $3.10M | 0.00% | +303,965 | New |
| Mint Tower Capital Management B.V. | 300,000 | $3.06M | 0.38% | 00.0% | Unchanged |
| Centiva Capital, LP | 285,515 | $2.92M | 0.27% | 00.0% | Unchanged |
| Verition Fund Management LLC | 251,470 | $2.57M | 0.01% | −50.0% | Reduced |
| Aristeia Capital LLC | 250,000 | $2.55M | 0.08% | 00.0% | Unchanged |
| Whitebox Advisors LLC | 250,000 | $2.55M | 0.05% | 00.0% | Unchanged |
| Berkley W R Corp | 228,206 | $2.33M | 0.15% | 00.0% | Unchanged |
| Schonfeld Strategic Advisors LLC | 221,665 | $2.27M | 0.02% | −98,335−30.7% | Reduced |
| UBS Oconnor LLC | 200,000 | $2.05M | 0.06% | 00.0% | Unchanged |
| Shaolin Capital Management LLC | 200,000 | $2.04M | 0.10% | 00.0% | Unchanged |
| DLD Asset Management, LP | 150,000 | $1.53M | 0.20% | −150,000−50.0% | Reduced |
| Toronto Dominion Bank | 150,000 | $1.53M | 0.00% | −244,700−62.0% | Reduced |
| Readystate Asset Management LP | 147,534 | $1.51M | 0.07% | +147,534 | New |
| MMCAP International Inc. SPC | 125,000 | $1.28M | 0.15% | +125,000 | New |
| K2 Principal Fund, L.P. | 113,670 | $1.16M | 0.12% | −46,500−29.0% | Reduced |
| Gritstone Asset Management LLC | 99,081 | $1.01M | 1.04% | −919−0.9% | Reduced |
| CSS LLC | 50,000 | $510.5K | 0.03% | 00.0% | Unchanged |
| Clear Street Group Inc. | 29,195 | $298.1K | 0.00% | +29,195 | New |
| Warberg Asset Management LLC | 10,000 | $102.3K | 0.03% | 00.0% | Unchanged |
| Morgan Stanley | 51 | $521 | 0.00% | −70−57.9% | Reduced |
| Clear Street LLC | – | – | – | – | Not filed |