ARCIU Archimedes Tech SPAC Partners III Co. - Unit
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Institutional owners (13F) 15 filers · $41.0M total · As of June 30, 2026
Institutions that report holding this stock in their quarterly SEC Form 13F. Long positions only; a single filer may appear twice for separate option legs. Large offsetting put/call legs typically reflect market-making or hedged inventory, not directional conviction.
| New positions | Exited positions | Increased | Decreased | Net shares change |
|---|---|---|---|---|
| 1 | 15 | 5 | 2 | — |
Compared to Q1 2026. SEC Form 13F filings are due within 45 days of quarter-end plus a short buffer for late filers — quarters still inside that window are skipped in favor of the most recent fully-reported pair. Change vs prior quarter not shown: filer coverage differs too much between these two quarters for a reliable comparison.
| Institution | Value | Shares | % of tracked 13F | Type |
|---|---|---|---|---|
| LMR Partners LLP | $12,737,500 | 1,250,000 | 31.10% | Shares |
| TUDOR INVESTMENT CORP ET AL | $6,623,500 | 650,000 | 16.17% | Shares |
| OMERS ADMINISTRATION Corp | $4,891,200 | 480,000 | 11.94% | Shares |
| ARISTEIA CAPITAL, L.L.C. | $4,083,938 | 400,779 | 9.97% | Shares |
| Lineage Point Capital LP | $3,011,934 | 288,776 | 7.35% | Shares |
| BlueCrest Capital Management Ltd | $2,821,500 | 275,000 | 6.89% | Shares |
| MILLENNIUM MANAGEMENT LLC | $1,831,581 | 179,743 | 4.47% | Shares |
| Qube Research & Technologies Ltd | $1,539,000 | 150,000 | 3.76% | Shares |
| Calamos Advisors LLC | $1,293,320 | 124,000 | 3.16% | Shares |
| Westchester Capital Management, LLC | $920,841 | 90,634 | 2.25% | Shares |
| TORONTO DOMINION BANK | $745,902 | 72,700 | 1.82% | Shares |
| Clear Street Group Inc. | $349,069 | 34,256 | 0.85% | Shares |
| Tuttle Capital Management, LLC | $109,413 | 10,769 | 0.27% | Shares |
| HRT FINANCIAL LP | $256 | 25,000 | 0.00% | Shares |
| GLAZER CAPITAL, LLC | $110 | 10,523 | 0.00% | Shares |