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 |
|---|---|---|---|---|---|
| Harraden Circle Investments, LLC | 1,684,715 | $623.4K | 0.12% | +644,715+62.0% | Added |
| Tenor Capital Management Co., L.P. | 750,000 | $292.5K | 0.00% | 00.0% | Unchanged |
| Magnetar Financial LLC | 650,000 | $240.5K | 0.00% | 00.0% | Unchanged |
| Linden Advisors LP | 585,196 | $216.6K | 0.00% | +85,197+17.0% | Added |
| Shaolin Capital Management LLC | 550,000 | $214.5K | 0.01% | −34,603−5.9% | Reduced |
| CSS LLC | 532,646 | $207.7K | 0.01% | 00.0% | Unchanged |
| CNH Partners LLC | 489,691 | $191.0K | 0.00% | −161,927−24.8% | Reduced |
| Healthcare of Ontario Pension Plan Trust Fund | 500,000 | $187.4K | 0.00% | 00.0% | Unchanged |
| LMR Partners LLP | 425,000 | $165.8K | 0.00% | 00.0% | Unchanged |
| Alberta Investment Management Corp | 375,000 | $146.3K | 0.00% | 00.0% | Unchanged |
| Driehaus Capital Management LLC | 400,000 | $140.0K | 0.00% | 00.0% | Unchanged |
| D. E. Shaw & Co., Inc. | 287,500 | $107.8K | 0.00% | 00.0% | Unchanged |
| K2 Principal Fund, L.P. | 259,895 | $91.0K | 0.01% | 00.0% | Unchanged |
| Moore Capital Management, LP | 225,000 | $87.8K | 0.00% | 00.0% | Unchanged |
| Periscope Capital Inc. | 198,600 | $73.5K | 0.02% | −25,000−11.2% | Reduced |
| Governors Lane LP | 197,403 | $73.1K | 0.01% | 00.0% | Unchanged |
| Westchester Capital Management, LLC | 199,999 | $70.0K | 0.00% | 00.0% | Unchanged |
| Rivernorth Capital Management, LLC | 178,875 | $62.6K | 0.00% | +178,875 | New |
| BNP Paribas Arbitrage, SA | 161,927 | $59.9K | 0.00% | +161,927 | New |
| Clear Street Group Inc. | 130,840 | $51.0K | 0.00% | +130,840 | New |
| Whitebox Advisors LLC | 125,000 | $48.8K | 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 |
| Aristeia Capital LLC | 125,000 | $46.3K | 0.00% | 00.0% | Unchanged |
| Parallax Volatility Advisers, L.P. | 123,890 | $45.8K | 0.00% | +68,300+122.9% | Added |
| Schonfeld Strategic Advisors LLC | 109,350 | $40.5K | 0.00% | −25,650−19.0% | Reduced |
| Verition Fund Management LLC | 104,800 | $39.3K | 0.00% | +4,800+4.8% | Added |
| MMCAP International Inc. SPC | 62,500 | $24.4K | 0.00% | +62,500 | New |
| Gritstone Asset Management LLC | 49,540 | $19.3K | 0.02% | −460−0.9% | Reduced |
| Hudson Bay Capital Management LP | 39,994 | $15.6K | 0.00% | 00.0% | Unchanged |
| Toronto Dominion Bank | 31,270 | $12.2K | 0.00% | −100−0.3% | Reduced |
| Readystate Asset Management LP | 25,000 | $9.37K | 0.00% | +25,000 | New |
| Highbridge Capital Management LLC | – | $3.79K | 0.00% | – | – |
| Wolverine Asset Management LLC | 3,521 | $1.37K | 0.00% | −2,000−36.2% | Reduced |
| 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 |