Archimedes Tech SPAC Partners II Co.
ATIIU- 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; 4 institutions reported holding it in 13F filings for Q2 2026, worth $1.32M in total; no superinvestor holds it.
13F holders, Q1 2025
Institutional positions in Archimedes Tech SPAC Partners II Co. as of Mar 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
- 44
- +44 vs. Q4 2024
- Shares held
- 19.3M
- +19.3M vs. Q4 2024
- Total value
- $194.1M
- +$194.1M vs. Q4 2024
- New holders
- 44
- 0 more added
- Sold out
- 0
- 0 more reduced
Compare with Q4 2024: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting ATIIU 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 | 4 | $1.32M |
| Q1 2026 | 5 | $1.18M |
| Q4 2025 | 4 | $2.37M |
| Q3 2025 | 6 | $3.46M |
| Q2 2025 | 9 | $13.4M |
| Q1 2025 | 44 | $194.1M |
| 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, Q1 2025
Shares, value and share of portfolio for each institution holding Archimedes Tech SPAC Partners II Co.; share changes are against Q4 2024.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Tenor Capital Management Co., L.P. | 1,500,000 | $15.2M | 0.22% | +1,500,000 | New |
| CNH Partners LLC | 1,303,242 | $13.1M | 0.32% | +1,303,242 | New |
| Magnetar Financial LLC | 1,300,000 | $13.1M | 0.17% | +1,300,000 | New |
| Healthcare of Ontario Pension Plan Trust Fund | 1,000,000 | $10.1M | 0.02% | +1,000,000 | New |
| Linden Advisors LP | 1,000,000 | $10.1M | 0.07% | +1,000,000 | New |
| LMR Partners LLP | 850,000 | $8.56M | 0.17% | +850,000 | New |
| Glazer Capital, LLC | 839,370 | $8.46M | 0.39% | +839,370 | New |
| CSS LLC | 820,803 | $8.27M | 0.58% | +820,803 | New |
| Ghisallo Capital Management LLC | 800,000 | $8.06M | 0.70% | +800,000 | New |
| Two Sigma Investments, LP | 725,000 | $7.31M | 0.02% | +725,000 | New |
| Hudson Bay Capital Management LP | 700,000 | $7.07M | 0.04% | +700,000 | New |
| Shaolin Capital Management LLC | 650,531 | $6.55M | 0.27% | +650,531 | New |
| Mizuho Securities USA LLC | 600,000 | $6.01M | 0.13% | +600,000 | New |
| D. E. Shaw & Co., Inc. | 575,000 | $5.81M | 0.01% | +575,000 | New |
| JPMorgan Chase & Co | 543,595 | $5.49M | 0.00% | +543,595 | New |
| Millennium Management LLC | 500,000 | $5.04M | 0.00% | +500,000 | New |
| Moore Capital Management, LP | 450,000 | $4.54M | 0.15% | +450,000 | New |
| Rivernorth Capital Management, LLC | 450,000 | $4.54M | 0.24% | +450,000 | New |
| Westchester Capital Management, LLC | 400,000 | $4.03M | 0.23% | +400,000 | New |
| Schonfeld Strategic Advisors LLC | 350,000 | $3.53M | 0.02% | +350,000 | New |
| K2 Principal Fund, L.P. | 319,790 | $3.22M | 0.49% | +319,790 | New |
| Periscope Capital Inc. | 300,000 | $3.03M | 1.69% | +300,000 | New |
| Mint Tower Capital Management B.V. | 300,000 | $3.02M | 1.12% | +300,000 | New |
| Verition Fund Management LLC | 291,500 | $2.94M | 0.02% | +291,500 | New |
| Aristeia Capital LLC | 250,000 | $2.52M | 0.08% | +250,000 | New |
| Picton Mahoney Asset Management | 250,000 | $2.52M | 0.09% | +250,000 | New |
| Crossingbridge Advisors, LLC | 250,000 | $2.52M | 1.34% | +250,000 | New |
| Whitebox Advisors LLC | 250,000 | $2.52M | 0.08% | +250,000 | New |
| Berkley W R Corp | 228,206 | $2.30M | 0.17% | +228,206 | New |
| Boothbay Fund Management, LLC | 218,600 | $2.21M | 0.08% | +218,600 | New |
| Atw Spac Management LLC | 218,600 | $2.20M | 3.67% | +218,600 | New |
| Clear Street LLC | 166,517 | $1.68M | 0.03% | +166,517 | New |
| Centiva Capital, LP | 150,000 | $1.51M | 0.09% | +150,000 | New |
| DLD Asset Management, LP | 150,000 | $1.51M | 0.22% | +150,000 | New |
| MMCAP International Inc. SPC | 125,000 | $1.26M | 0.21% | +125,000 | New |
| Parallax Volatility Advisers, L.P. | 100,000 | $1.01M | 0.03% | +100,000 | New |
| Gritstone Asset Management LLC | 100,000 | $1.01M | 1.06% | +100,000 | New |
| Wealthspring Capital LLC | 77,376 | $780.0K | 1.20% | +77,376 | New |
| Jane Street Group, LLC | 65,110 | $657.0K | 0.00% | +65,110 | New |
| Wolverine Asset Management LLC | 25,900 | $260.8K | 0.01% | +25,900 | New |
| Highbridge Capital Management LLC | 25,000 | $252.5K | 0.01% | +25,000 | New |
| Tuttle Tactical Management | 20,000 | $201.4K | 0.88% | +20,000 | New |
| Warberg Asset Management LLC | 10,000 | $100.9K | 0.03% | +10,000 | New |
| UBS Group AG | 1,000 | $10.1K | 0.00% | +1,000 | New |