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 ATIIW from SEC Form 13F filings across 33 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, 33 institutions disclosed 8.4M shares of Archimedes Tech SPAC Partners II Co. worth $18.1M — about 36.4% of shares outstanding; the largest disclosed holder is Harraden Circle Investments, LLC. Source: SEC Form 13F filings, parsed by EvidInvest.
33
13F holders
$18.1M
value, 2026 filers
36.4%
of shares outstanding (8.4M sh)
7
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 ATIIW's shares outstanding
| # | Manager | Shares | Value | % of fund | % of co. | Δ shares QoQ |
|---|---|---|---|---|---|---|
| 1 | Harraden Circle Investments, LLC | 1.1M | $2.5M | 0.3% | 4.9% | -29.7% |
| 2 | ARISTEIA CAPITAL, L.L.C. | 788,491 | $1.7M | 0.0% | 3.4% | +530.8% |
| 3 | TENOR CAPITAL MANAGEMENT Co., L.P. | 750,000 | $1.6M | 0.0% | 3.3% | 0.0% |
| 4 | LMR Partners LLP | 613,701 | $1.3M | 0.0% | 2.7% | +44.4% |
| 5 | Linden Advisors LP | 504,138 | $1.1M | 0.0% | 2.2% | -41.4% |
| 6 | HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND | 500,000 | $1.1M | 0.0% | 2.2% | 0.0% |
| 7 | AQR Arbitrage LLC | 481,366 | $1.0M | 0.0% | 2.1% | +0.5% |
| 8 | Magnetar Financial LLC | 437,600 | $953,968 | 0.0% | 1.9% | -32.7% |
| 9 | Alberta Investment Management Corp | 375,000 | $821,213 | 0.0% | 1.6% | 0.0% |
| 10 | Decagon Asset Management LLPNEW | 331,302 | $725,519 | 0.1% | 1.4% | new |
| 11 | D. E. Shaw & Co., Inc. | 287,500 | $626,750 | 0.0% | 1.3% | 0.0% |
| 12 | K2 PRINCIPAL FUND, L.P. | 280,718 | $614,772 | 0.0% | 1.2% | +17.0% |
| 13 | MOORE CAPITAL MANAGEMENT, LP | 225,000 | $492,728 | 0.0% | 1% | 0.0% |
| 14 | RIVERNORTH CAPITAL MANAGEMENT, LLC | 224,942 | $323,916 | 0.0% | 1% | 0.0% |
| 15 | Shaolin Capital Management LLC | 181,640 | $397,773 | 0.0% | 0.8% | -63.7% |
| 16 | BNP PARIBAS FINANCIAL MARKETS | 161,927 | $354,604 | 0.0% | 0.7% | 0.0% |
| 17 | CSS LLC/IL | 151,718 | $332,248 | 0.0% | 0.7% | -68.9% |
| 18 | Sculptor Capital LPNEW | 150,200 | $328,923 | 0.0% | 0.7% | new |
| 19 | Mint Tower Capital Management B.V. | 130,000 | $285,000 | 0.0% | 0.6% | -13.3% |
| 20 | WHITEBOX ADVISORS LLC | 125,000 | $273,738 | 0.0% | 0.5% | 0.0% |
| 21 | Alpine Global Management, LLCNEW | 71,039 | $155,568 | 0.0% | 0.3% | new |
| 22 | DLD Asset Management, LP | 69,400 | $151,979 | 0.0% | 0.3% | -30.6% |
| 23 | MMCAP International Inc. SPC | 62,500 | $136,869 | 0.0% | 0.3% | 0.0% |
| 24 | Clear Street Group Inc. | 60,000 | $131,394 | 0.0% | 0.3% | -60.9% |
| 25 | SUSQUEHANNA INTERNATIONAL GROUP, LLPNEW | 48,825 | $106,439 | 0.0% | 0.2% | new |
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. Research, not investment advice.