Archimedes Tech SPAC Partners II Co.
ATIIW- 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; 33 institutions reported holding it in 13F filings for Q2 2026, worth $18.1M 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
- 37
- +2 vs. Q3 2025
- Shares held
- 10.4M
- +443.6K (+4.4%) vs. Q3 2025
- Total value
- $5.56M
- +$1.86M (+50.2%) vs. Q3 2025
- New holders
- 2
- 5 more added
- Sold out
- 0
- 7 more reduced
Compare with Q3 2025: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting ATIIW 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 | 33 | $18.1M |
| Q1 2026 | 37 | $5.08M |
| Q4 2025 | 37 | $5.56M |
| Q3 2025 | 35 | $3.70M |
| Q2 2025 | 36 | $3.76M |
| 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 |
|---|---|---|---|---|---|
| Harraden Circle Investments, LLC | 1,734,715 | $952.5K | 0.17% | +50,000+3.0% | Added |
| Linden Advisors LP | 860,962 | $460.3K | 0.00% | +275,766+47.1% | Added |
| Tenor Capital Management Co., L.P. | 750,000 | $411.8K | 0.01% | 00.0% | Unchanged |
| Magnetar Financial LLC | 650,000 | $356.9K | 0.00% | 00.0% | Unchanged |
| CSS LLC | 540,426 | $296.7K | 0.02% | +7,780+1.5% | Added |
| Shaolin Capital Management LLC | 500,000 | $274.6K | 0.01% | −50,000−9.1% | Reduced |
| Healthcare of Ontario Pension Plan Trust Fund | 500,000 | $274.6K | 0.00% | 00.0% | Unchanged |
| CNH Partners LLC | 489,691 | $268.9K | 0.01% | 00.0% | Unchanged |
| LMR Partners LLP | 425,000 | $233.4K | 0.00% | 00.0% | Unchanged |
| Driehaus Capital Management LLC | 400,000 | $219.6K | 0.00% | 00.0% | Unchanged |
| Alberta Investment Management Corp | 375,000 | $205.9K | 0.00% | 00.0% | Unchanged |
| D. E. Shaw & Co., Inc. | 287,500 | $157.9K | 0.00% | 00.0% | Unchanged |
| K2 Principal Fund, L.P. | 239,895 | $131.9K | 0.01% | −20,000−7.7% | Reduced |
| Moore Capital Management, LP | 225,000 | $123.5K | 0.00% | 00.0% | Unchanged |
| Rivernorth Capital Management, LLC | 224,942 | $123.5K | 0.01% | +46,067+25.8% | Added |
| Westchester Capital Management, LLC | 199,999 | $109.8K | 0.01% | 00.0% | Unchanged |
| DLD Asset Management, LP | 341,901 | $109.1K | 0.01% | +341,901 | New |
| Periscope Capital Inc. | 198,600 | $109.1K | 0.02% | 00.0% | Unchanged |
| Governors Lane LP | 197,403 | $108.4K | 0.01% | 00.0% | Unchanged |
| BNP Paribas Arbitrage, SA | 161,927 | $88.9K | 0.00% | 00.0% | Unchanged |
| Whitebox Advisors LLC | 125,000 | $68.6K | 0.00% | 00.0% | Unchanged |
| Picton Mahoney Asset Management | 125,000 | $68.6K | 0.00% | 00.0% | Unchanged |
| Aristeia Capital LLC | 125,000 | $66.8K | 0.00% | 00.0% | Unchanged |
| Clear Street Group Inc. | 113,240 | $62.2K | 0.00% | −17,600−13.5% | Reduced |
| Verition Fund Management LLC | 87,000 | $47.8K | 0.00% | −17,800−17.0% | Reduced |
| Schonfeld Strategic Advisors LLC | 82,192 | $45.1K | 0.00% | −27,158−24.8% | Reduced |
| MMCAP International Inc. SPC | 62,500 | $34.3K | 0.00% | 00.0% | Unchanged |
| Glazer Capital, LLC | 55,000 | $30.0K | 0.00% | −80,048−59.3% | Reduced |
| Parallax Volatility Advisers, L.P. | 49,796 | $27.3K | 0.00% | −74,094−59.8% | Reduced |
| Gritstone Asset Management LLC | 49,540 | $27.2K | 0.03% | 00.0% | Unchanged |
| Hudson Bay Capital Management LP | 39,994 | $22.0K | 0.00% | 00.0% | Unchanged |
| Toronto Dominion Bank | 39,269 | $21.6K | 0.00% | +7,999+25.6% | Added |
| Readystate Asset Management LP | 25,000 | $13.7K | 0.00% | 00.0% | Unchanged |
| Highbridge Capital Management LLC | – | $5.55K | 0.00% | – | – |
| Wolverine Asset Management LLC | 3,521 | $1.93K | 0.00% | 00.0% | Unchanged |
| UBS Group AG | 782 | $429 | 0.00% | +782 | New |
| Mint Tower Capital Management B.V. | 150,000 | – | – | 00.0% | Unchanged |