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, 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
- 35
- 0 vs. Q2 2025
- Shares held
- 9.99M
- +218.1K (+2.2%) vs. Q2 2025
- Total value
- $3.70M
- +$518 (0.0%) vs. Q2 2025
- New holders
- 5
- 4 more added
- Sold out
- 5
- 8 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 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, 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 |
|---|---|---|---|---|---|
| Wolverine Asset Management LLC | 3,521 | $1.37K | 0.00% | −2,000−36.2% | Reduced |
| Highbridge Capital Management LLC | – | $3.79K | 0.00% | – | – |
| Readystate Asset Management LP | 25,000 | $9.37K | 0.00% | +25,000 | New |
| Toronto Dominion Bank | 31,270 | $12.2K | 0.00% | −100−0.3% | Reduced |
| Hudson Bay Capital Management LP | 39,994 | $15.6K | 0.00% | 00.0% | Unchanged |
| Gritstone Asset Management LLC | 49,540 | $19.3K | 0.02% | −460−0.9% | Reduced |
| MMCAP International Inc. SPC | 62,500 | $24.4K | 0.00% | +62,500 | New |
| Verition Fund Management LLC | 104,800 | $39.3K | 0.00% | +4,800+4.8% | Added |
| Schonfeld Strategic Advisors LLC | 109,350 | $40.5K | 0.00% | −25,650−19.0% | Reduced |
| Parallax Volatility Advisers, L.P. | 123,890 | $45.8K | 0.00% | +68,300+122.9% | Added |
| Aristeia Capital LLC | 125,000 | $46.3K | 0.00% | 00.0% | Unchanged |
| Glazer Capital, LLC | 135,048 | $47.0K | 0.00% | −114,890−46.0% | Reduced |
| Picton Mahoney Asset Management | 125,000 | $47.0K | 0.00% | 00.0% | Unchanged |
| Whitebox Advisors LLC | 125,000 | $48.8K | 0.00% | 00.0% | Unchanged |
| Clear Street Group Inc. | 130,840 | $51.0K | 0.00% | +130,840 | New |
| BNP Paribas Arbitrage, SA | 161,927 | $59.9K | 0.00% | +161,927 | New |
| Rivernorth Capital Management, LLC | 178,875 | $62.6K | 0.00% | +178,875 | New |
| Westchester Capital Management, LLC | 199,999 | $70.0K | 0.00% | 00.0% | Unchanged |
| Governors Lane LP | 197,403 | $73.1K | 0.01% | 00.0% | Unchanged |
| Periscope Capital Inc. | 198,600 | $73.5K | 0.02% | −25,000−11.2% | Reduced |
| Moore Capital Management, LP | 225,000 | $87.8K | 0.00% | 00.0% | Unchanged |
| K2 Principal Fund, L.P. | 259,895 | $91.0K | 0.01% | 00.0% | Unchanged |
| D. E. Shaw & Co., Inc. | 287,500 | $107.8K | 0.00% | 00.0% | Unchanged |
| Driehaus Capital Management LLC | 400,000 | $140.0K | 0.00% | 00.0% | Unchanged |
| Alberta Investment Management Corp | 375,000 | $146.3K | 0.00% | 00.0% | Unchanged |
| LMR Partners LLP | 425,000 | $165.8K | 0.00% | 00.0% | Unchanged |
| Healthcare of Ontario Pension Plan Trust Fund | 500,000 | $187.4K | 0.00% | 00.0% | Unchanged |
| CNH Partners LLC | 489,691 | $191.0K | 0.00% | −161,927−24.8% | Reduced |
| CSS LLC | 532,646 | $207.7K | 0.01% | 00.0% | Unchanged |
| Shaolin Capital Management LLC | 550,000 | $214.5K | 0.01% | −34,603−5.9% | Reduced |
| Linden Advisors LP | 585,196 | $216.6K | 0.00% | +85,197+17.0% | Added |
| Magnetar Financial LLC | 650,000 | $240.5K | 0.00% | 00.0% | Unchanged |
| Tenor Capital Management Co., L.P. | 750,000 | $292.5K | 0.00% | 00.0% | Unchanged |
| Harraden Circle Investments, LLC | 1,684,715 | $623.4K | 0.12% | +644,715+62.0% | Added |
| Mint Tower Capital Management B.V. | 150,000 | – | – | 00.0% | Unchanged |
| Sculptor Capital LP | 0 | $0 | 0.00% | −595,760−100.0% | Sold out |
| Centiva Capital, LP | 0 | $0 | 0.00% | −75,000−100.0% | Sold out |
| Mizuho Securities USA LLC | 0 | $0 | 0.00% | −85,197−100.0% | Sold out |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 0 | $0 | 0.00% | −22,557−100.0% | Sold out |
| UBS Group AG | 0 | $0 | 0.00% | −874−100.0% | Sold out |
| Clear Street LLC | – | – | – | – | Not filed |