Who owns Archimedes Tech SPAC Partners II Co.?
Prices and market caps: Cboe delayed data, at least 15 minutes delayed. Not real-time. Fundamentals from company filings.
Institutional ownership of ATII from SEC Form 13F filings across 51 reporting managers. All positions are from one synchronized reporting period — 2026-06-30 books, filed up to 45 days after quarter end — so every row is comparable.
As of the 2026-06-30 reporting period, 51 institutions disclosed 17.6M shares of Archimedes Tech SPAC Partners II Co. worth $189.8M — about 76.6% of shares outstanding; the largest disclosed holder is TENOR CAPITAL MANAGEMENT Co., L.P.. Source: SEC Form 13F filings, parsed by EvidInvest.
51
13F holders
$189.8M
value, 2026 filers
76.6%
of shares outstanding (17.6M sh)
13
new positions (2026 filers)
Top institutional holders
ordered by shares owned · positions as of 2026-06-30 · % of fund = share of the manager's own book · % of co. = share of ATII's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | TENOR CAPITAL MANAGEMENT Co., L.P. | 1.4M | $14.7M | 0.2% | 5.9% | -8.8% |
| 2 | Fort Baker Capital Management LPNEW | 1.3M | $14.3M | 1.0% | 5.8% | new |
| 3 | Magnetar Financial LLC | 1.3M | $14.0M | 0.1% | 5.6% | -0.2% |
| 4 | D. E. Shaw & Co., Inc. | 1.1M | $12.3M | 0.0% | 5% | 0.0% |
| 5 | Decagon Asset Management LLPNEW | 937,829 | $10.1M | 1.9% | 4.1% | new |
| 6 | Linden Advisors LP | 848,273 | $9.1M | 0.0% | 3.7% | -15.2% |
| 7 | Ghisallo Capital Management LLC | 800,000 | $8.6M | 0.2% | 3.5% | 0.0% |
| 8 | TWO SIGMA INVESTMENTS, LP | 725,000 | $7.8M | 0.0% | 3.2% | 0.0% |
| 9 | Hudson Bay Capital Management LP | 700,000 | $7.5M | 0.0% | 3% | 0.0% |
| 10 | Shay Capital LLCNEW | 623,687 | $6.7M | 0.4% | 2.7% | new |
| 11 | Governors Lane LP | 604,857 | $6.5M | 0.5% | 2.6% | -20.4% |
| 12 | AQR Arbitrage LLC | 590,262 | $6.4M | 0.1% | 2.6% | -35.9% |
| 13 | Sculptor Capital LP | 552,619 | $6.0M | 0.0% | 2.4% | -8.0% |
| 14 | K2 PRINCIPAL FUND, L.P. | 526,227 | $5.7M | 0.4% | 2.3% | +498.7% |
| 15 | LMR Partners LLP | 478,978 | $5.2M | 0.0% | 2.1% | -43.6% |
| 16 | Radcliffe Capital Management, L.P. | 478,061 | $5.2M | 0.4% | 2.1% | -27.7% |
| 17 | MOORE CAPITAL MANAGEMENT, LP | 450,000 | $4.9M | 0.1% | 2% | 0.0% |
| 18 | Alberta Investment Management Corp | 400,000 | $4.3M | 0.0% | 1.7% | -46.7% |
| 19 | FNY Investment Advisers, LLCNEW | 327,200 | $3.5M | 1.3% | 1.4% | new |
| 20 | Mint Tower Capital Management B.V. | 300,000 | $3.2M | 0.4% | 1.3% | 0.0% |
| 21 | CITADEL ADVISORS LLC | 250,266 | $2.7M | 0.0% | 1.1% | +2311.7% |
| 22 | WHITEBOX ADVISORS LLC | 250,000 | $2.7M | 0.0% | 1.1% | 0.0% |
| 23 | Harraden Circle Investments, LLCNEW | 234,661 | $2.5M | 0.3% | 1% | new |
| 24 | GOLDMAN SACHS GROUP INC | 205,090 | $2.2M | 0.0% | 0.9% | -37.4% |
| 25 | ARISTEIA CAPITAL, L.L.C. | 200,000 | $2.2M | 0.0% | 0.9% | -20.0% |
Source: SEC Form 13F-HR filings (institutional managers over $100M in US-listed positions). 13Fs disclose long positions only, up to 45 days after quarter end; each manager's latest filed quarter is shown per row and dollar values are the manager's filed marks. Aggregates labeled "2026 filers" count only managers whose latest book is a 2026 quarter. Related: valuation · options positioning · supply chain. Research, not investment advice.