Archimedes Tech SPAC Partners II Co.
Ownership
Ownership Structure
Who owns Archimedes Tech SPAC Partners II Co. (ATII)? This page shows the largest institutions and funds, the ownership structure and the latest insider transactions. 78.8% of the shares are freely tradable; institutional investors hold 73.4%.
Largest Shareholders
Institutions
| Name | Stake (%) | Shares | Change (%) | Date |
|---|---|---|---|---|
| Tenor Capital Management Co Lp | 5.07 | 1,500,000 | +0.0 | 03/31/2026 |
| Magnetar Financial LLC | 4.38 | 1,297,302 | -0.2 | 06/30/2026 |
| D. E. Shaw & Co LP | 3.85 | 1,138,500 | +0.0 | 06/30/2026 |
| Cnh Partners, LLC | 3.11 | 920,672 | -4.5 | 03/31/2026 |
| Westchester Capital Management LLC | 3.07 | 907,144 | +0.0 | 03/31/2026 |
| LMR Partners LLP | 2.87 | 850,000 | +0.0 | 03/31/2026 |
| Linden Advisors LLC | 2.87 | 848,273 | -15.2 | 06/30/2026 |
| Ghisallo Capital Management LLC | 2.70 | 800,000 | +0.0 | 03/31/2026 |
| Governors Lane LP | 2.57 | 759,556 | +0.1 | 03/31/2026 |
| Two Sigma Investments LLC | 2.45 | 725,000 | +0.0 | 06/30/2026 |
Largest reported positions according to regulatory filings; stake as a percentage of shares outstanding, change versus the previous filing. Source: fundamentals data.
Data as of: September 28, 2026 · Source: fundamental data & SEC filings (annual and quarterly reports, 10-K/10-Q)
Note: pure fact-based analysis, not investment advice and not a solicitation to buy or sell. All figures without guarantee.