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, Q2 2025
Institutional positions in Archimedes Tech SPAC Partners II Co. as of Jun 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
- 9
- −34 vs. Q1 2025
- Shares held
- 1.30M
- −17.3M (−93.0%) vs. Q1 2025
- Total value
- $13.4M
- −$174.7M (−92.9%) vs. Q1 2025
- New holders
- 1
- 1 more added
- Sold out
- 35
- 3 more reduced
1 institution that held it in Q1 2025 haven't filed for Q2 2025 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.
Compare with Q1 2025: 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, Q2 2025
Shares, value and share of portfolio for each institution holding Archimedes Tech SPAC Partners II Co.; share changes are against Q1 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Millennium Management LLC | 500,000 | $5.15M | 0.00% | 00.0% | Unchanged |
| Rivernorth Capital Management, LLC | 450,000 | $4.58M | 0.25% | 00.0% | Unchanged |
| JPMorgan Chase & Co | 138,380 | $1.45M | 0.00% | −405,215−74.5% | Reduced |
| MMCAP International Inc. SPC | 125,000 | $1.29M | 0.15% | 00.0% | Unchanged |
| Jane Street Group, LLC | 46,660 | $481.1K | 0.00% | −18,450−28.3% | Reduced |
| Tuttle Tactical Management | 20,000 | $206.1K | 0.85% | 00.0% | Unchanged |
| Clear Street LLC | 19,194 | $197.8K | 0.00% | −147,323−88.5% | Reduced |
| UBS Group AG | 4,130 | $42.0K | 0.00% | +3,130+313.0% | Added |
| Toronto Dominion Bank | 1 | $10 | 0.00% | +1 | New |
| Tenor Capital Management Co., L.P. | 0 | $0 | 0.00% | −1,500,000−100.0% | Sold out |
| CNH Partners LLC | 0 | $0 | 0.00% | −1,303,242−100.0% | Sold out |
| Magnetar Financial LLC | 0 | $0 | 0.00% | −1,300,000−100.0% | Sold out |
| Healthcare of Ontario Pension Plan Trust Fund | 0 | $0 | 0.00% | −1,000,000−100.0% | Sold out |
| Linden Advisors LP | 0 | $0 | 0.00% | −1,000,000−100.0% | Sold out |
| LMR Partners LLP | 0 | $0 | 0.00% | −850,000−100.0% | Sold out |
| Glazer Capital, LLC | 0 | $0 | 0.00% | −839,370−100.0% | Sold out |
| CSS LLC | 0 | $0 | 0.00% | −820,803−100.0% | Sold out |
| Ghisallo Capital Management LLC | 0 | $0 | 0.00% | −800,000−100.0% | Sold out |
| Two Sigma Investments, LP | 0 | $0 | 0.00% | −725,000−100.0% | Sold out |
| Hudson Bay Capital Management LP | 0 | $0 | 0.00% | −700,000−100.0% | Sold out |
| Shaolin Capital Management LLC | 0 | $0 | 0.00% | −650,531−100.0% | Sold out |
| D. E. Shaw & Co., Inc. | 0 | $0 | 0.00% | −575,000−100.0% | Sold out |
| Moore Capital Management, LP | 0 | $0 | 0.00% | −450,000−100.0% | Sold out |
| Westchester Capital Management, LLC | 0 | $0 | 0.00% | −400,000−100.0% | Sold out |
| Schonfeld Strategic Advisors LLC | 0 | $0 | 0.00% | −350,000−100.0% | Sold out |
| K2 Principal Fund, L.P. | 0 | $0 | 0.00% | −319,790−100.0% | Sold out |
| Periscope Capital Inc. | 0 | $0 | 0.00% | −300,000−100.0% | Sold out |
| Mint Tower Capital Management B.V. | 0 | $0 | 0.00% | −300,000−100.0% | Sold out |
| Verition Fund Management LLC | 0 | $0 | 0.00% | −291,500−100.0% | Sold out |
| Aristeia Capital LLC | 0 | $0 | 0.00% | −250,000−100.0% | Sold out |
| Picton Mahoney Asset Management | 0 | $0 | 0.00% | −250,000−100.0% | Sold out |
| Crossingbridge Advisors, LLC | 0 | $0 | 0.00% | −250,000−100.0% | Sold out |
| Whitebox Advisors LLC | 0 | $0 | 0.00% | −250,000−100.0% | Sold out |
| Berkley W R Corp | 0 | $0 | 0.00% | −228,206−100.0% | Sold out |
| Boothbay Fund Management, LLC | 0 | $0 | 0.00% | −218,600−100.0% | Sold out |
| Atw Spac Management LLC | 0 | $0 | 0.00% | −218,600−100.0% | Sold out |
| Centiva Capital, LP | 0 | $0 | 0.00% | −150,000−100.0% | Sold out |
| DLD Asset Management, LP | 0 | $0 | 0.00% | −150,000−100.0% | Sold out |
| Parallax Volatility Advisers, L.P. | 0 | $0 | 0.00% | −100,000−100.0% | Sold out |
| Gritstone Asset Management LLC | 0 | $0 | 0.00% | −100,000−100.0% | Sold out |
| Wealthspring Capital LLC | 0 | $0 | 0.00% | −77,376−100.0% | Sold out |
| Wolverine Asset Management LLC | 0 | $0 | 0.00% | −25,900−100.0% | Sold out |
| Highbridge Capital Management LLC | 0 | $0 | 0.00% | −25,000−100.0% | Sold out |
| Warberg Asset Management LLC | 0 | $0 | 0.00% | −10,000−100.0% | Sold out |
| Mizuho Securities USA LLC | – | – | – | – | Not filed |