Archimedes Tech SPAC Partners II Co.
ATII- 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; 50 institutions reported holding it in 13F filings for Q2 2026, worth $189.6M in total; no superinvestor holds it.
13F holders, Q2 2026
Institutional positions in Archimedes Tech SPAC Partners II Co. as of Jun 30, 2026. 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
- 50
- −4 vs. Q1 2026
- Shares held
- 17.6M
- −4.60M (−20.7%) vs. Q1 2026
- Total value
- $189.6M
- −$41.7M (−18.0%) vs. Q1 2026
- New holders
- 13
- 3 more added
- Sold out
- 17
- 23 more reduced
Compare with Q1 2026: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting ATII 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 | 50 | $189.6M |
| Q1 2026 | 54 | $231.3M |
| Q4 2025 | 49 | $230.4M |
| Q3 2025 | 46 | $225.0M |
| Q2 2025 | 42 | $216.0M |
| 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, Q2 2026
Shares, value and share of portfolio for each institution holding Archimedes Tech SPAC Partners II Co.; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| Tenor Capital Management Co., L.P. | 1,367,830 | $14.7M | 0.21% | −132,170−8.8% | Reduced |
| Fort Baker Capital Management LP | 1,330,746 | $14.3M | 1.14% | +1,330,746 | New |
| Magnetar Financial LLC | 1,297,302 | $14.0M | 0.13% | −2,698−0.2% | Reduced |
| D. E. Shaw & Co., Inc. | 1,138,500 | $12.3M | 0.01% | 00.0% | Unchanged |
| Decagon Asset Management LLP | 937,829 | $10.1M | 2.02% | +937,829 | New |
| Linden Advisors LP | 848,273 | $9.14M | 0.05% | −151,727−15.2% | Reduced |
| Ghisallo Capital Management LLC | 800,000 | $8.62M | 0.17% | 00.0% | Unchanged |
| Two Sigma Investments, LP | 725,000 | $7.82M | 0.01% | 00.0% | Unchanged |
| Hudson Bay Capital Management LP | 700,000 | $7.55M | 0.04% | 00.0% | Unchanged |
| Shay Capital LLC | 623,687 | $6.72M | 0.74% | +623,687 | New |
| Governors Lane LP | 604,857 | $6.52M | 0.65% | −154,699−20.4% | Reduced |
| CNH Partners LLC | 590,262 | $6.36M | 0.09% | −330,410−35.9% | Reduced |
| Sculptor Capital LP | 552,619 | $5.96M | 0.06% | −48,027−8.0% | Reduced |
| K2 Principal Fund, L.P. | 526,227 | $5.67M | 0.52% | +438,327+498.7% | Added |
| LMR Partners LLP | 478,978 | $5.16M | 0.04% | −371,022−43.6% | Reduced |
| Radcliffe Capital Management, L.P. | 478,061 | $5.15M | 0.39% | −183,276−27.7% | Reduced |
| Moore Capital Management, LP | 450,000 | $4.85M | 0.11% | 00.0% | Unchanged |
| Alberta Investment Management Corp | 400,000 | $4.31M | 0.02% | −350,000−46.7% | Reduced |
| FNY Investment Advisers, LLC | 327,200 | $3.53M | 1.29% | +327,200 | New |
| Mint Tower Capital Management B.V. | 300,000 | $3.23M | 0.38% | 00.0% | Unchanged |
| Citadel Advisors LLC | 250,266 | $2.70M | 0.00% | +239,889+2,311.7% | Added |
| Whitebox Advisors LLC | 250,000 | $2.69M | 0.04% | 00.0% | Unchanged |
| Harraden Circle Investments, LLC | 234,661 | $2.53M | 0.32% | +234,661 | New |
| Goldman Sachs Group Inc | 205,090 | $2.21M | 0.00% | −122,360−37.4% | Reduced |
| Aristeia Capital LLC | 200,000 | $2.16M | 0.03% | −50,000−20.0% | Reduced |
| L1 Global Manager Pty Ltd | 200,000 | $2.16M | 1.75% | 00.0% | Unchanged |
| DLD Asset Management, LP | 195,453 | $2.11M | 0.17% | +45,453+30.3% | Added |
| Jain Global LLC | 185,108 | $2.00M | 0.02% | −314,892−63.0% | Reduced |
| SkyView Investment Advisors, LLC | 182,495 | $1.97M | 1.54% | +182,495 | New |
| Periscope Capital Inc. | 175,000 | $1.89M | 0.30% | −177,880−50.4% | Reduced |
| Verition Fund Management LLC | 140,797 | $1.52M | 0.01% | −90,673−39.2% | Reduced |
| MMCAP International Inc. SPC | 125,000 | $1.35M | 0.11% | 00.0% | Unchanged |
| Tudor Investment Corp Et Al | 123,842 | $1.34M | 0.01% | +123,842 | New |
| Cantor Fitzgerald, L. P. | 88,283 | $951.7K | 0.02% | +88,283 | New |
| Toronto Dominion Bank | 82,550 | $889.9K | 0.00% | −567,450−87.3% | Reduced |
| Baird Financial Group, Inc. | 78,500 | $846.2K | 0.00% | 00.0% | Unchanged |
| Shaolin Capital Management LLC | 76,171 | $821.1K | 0.05% | −194,612−71.9% | Reduced |
| Millennium Management LLC | 69,384 | $748.0K | 0.00% | −238,601−77.5% | Reduced |
| Glazer Capital, LLC | 50,100 | $540.0K | 0.01% | −699,900−93.3% | Reduced |
| Schonfeld Strategic Advisors LLC | 50,000 | $539.0K | 0.00% | −123,515−71.2% | Reduced |
| HRT Financial LP | 47,190 | $508.0K | 0.00% | +47,190 | New |
| Clear Street Group Inc. | 25,000 | $269.5K | 0.00% | −52,452−67.7% | Reduced |
| BNP Paribas Arbitrage, SA | 23,790 | $256.5K | 0.00% | −13,954−37.0% | Reduced |
| Highbridge Capital Management LLC | 17,497 | $189.1K | 0.01% | +17,497 | New |
| Readystate Asset Management LP | 12,528 | $135.1K | 0.01% | −136,206−91.6% | Reduced |
| Geode Capital Management, LLC | 11,102 | $119.7K | 0.00% | 00.0% | Unchanged |
| EverSource Wealth Advisors, LLC | 8,500 | $91.6K | 0.00% | +8,500 | New |
| UBS Group AG | 1,658 | $17.9K | 0.00% | +1,658 | New |
| Morgan Stanley | 35 | $377 | 0.00% | −27−43.5% | Reduced |
| Caitong International Asset Management Co., Ltd | 4 | $43 | 0.00% | +4 | New |
| Westchester Capital Management, LLC | 0 | $0 | 0.00% | −907,144−100.0% | Sold out |
| Picton Mahoney Asset Management | 0 | $0 | 0.00% | −500,000−100.0% | Sold out |
| Rivernorth Capital Management, LLC | 0 | $0 | 0.00% | −427,500−100.0% | Sold out |
| RLH Capital LLC | 0 | $0 | 0.00% | −400,907−100.0% | Sold out |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 0 | $0 | 0.00% | −400,000−100.0% | Sold out |
| J. Goldman & Co LP | 0 | $0 | 0.00% | −369,778−100.0% | Sold out |
| Meteora Capital, LLC | 0 | $0 | 0.00% | −295,612−100.0% | Sold out |
| Centiva Capital, LP | 0 | $0 | 0.00% | −285,515−100.0% | Sold out |
| Quarry LP | 0 | $0 | 0.00% | −285,000−100.0% | Sold out |
| Berkley W R Corp | 0 | $0 | 0.00% | −208,065−100.0% | Sold out |
| O'Connor Alternative Investments LLC | 0 | $0 | 0.00% | −200,000−100.0% | Sold out |
| Wolverine Asset Management LLC | 0 | $0 | 0.00% | −134,280−100.0% | Sold out |
| Gritstone Asset Management LLC | 0 | $0 | 0.00% | −99,081−100.0% | Sold out |
| Lineage Point Capital LP | 0 | $0 | 0.00% | −95,895−100.0% | Sold out |
| CSS LLC | 0 | $0 | 0.00% | −57,143−100.0% | Sold out |
| Virtu Financial LLC | 0 | $0 | 0.00% | −53,686−100.0% | Sold out |
| Mizuho Securities USA LLC | 0 | $0 | 0.00% | −19,469−100.0% | Sold out |