Who owns Archimedes Tech SPAC Partners III Co., from the filings themselves: stakes over 5% (Schedule 13D/G), the institutional managers reporting the stock each quarter (13F), and the funds holding it (N-PORT).
Investors crossing 5% ownership must disclose it. Schedule 13G filers certify the stake is passive; Schedule 13D is the general form for everyone else — founders, strategic holders, and activists alike. Each entry is the holder's most recent disclosure. Coverage begins with SEC's structured filings from December 18, 2024; a holder appears once they file or amend after that date.
Adage Capital Management, L.P.: 5.1% · 1,800,000 shares — Robert Atchinson: 5.1% · 1,800,000 shares — Phillip Gross: 5.1% · 1,800,000 shares
Every institutional manager whose latest 13F reports this stock, largest position first. "% of their portfolio" is the weight inside that manager's own book — how much conviction the position represents; "% of company" is how much of Archimedes Tech SPAC Partners III Co. they hold. Together these 56 managers report 58.22% of shares outstanding.
| Investor | Position value | Shares | % of their portfolio | % of company | As of |
|---|---|---|---|---|---|
| ADAGE CAPITAL PARTNERS GP, L.L.C. | $18M | 1,800,000 | 0.03% | 5.10% | June 30, 2026 |
| Linden Advisors LP | $12M | 1,200,000 | 0.06% | 3.40% | June 30, 2026 |
54 more institutional holders behind a free account
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Sign up freeFunds disclosing this stock in their monthly N-PORT portfolio, with the position's share of the fund's net assets. Together these 5 funds hold 1.24% of shares outstanding — counted inside the manager totals above, not on top of them, since a fund's shares also appear in its manager's 13F.
| Fund | Position value | % of net assets | % of company | As of |
|---|---|---|---|---|
| First Trust Merger Arbitrage Fund | $1.69M | 0.11% | 0.49% | March 31, 2026 |
| First Trust Alternative Opportunities Fund | $1M | 0.03% | 0.28% | June 30, 2026 |
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