Archimedes Tech SPAC Partners III Co.
ARCIU- Exchange
- Nasdaq
- Industry
- Blank Checks
- SEC CIK
- 0002083910
No open-market purchases or sales by Archimedes Tech SPAC Partners III Co. insiders were filed in the last 90 days; 15 institutions reported holding it in 13F filings for Q2 2026, worth $47.3M in total; no superinvestor holds it.
13F holders, Q2 2026
Institutional positions in Archimedes Tech SPAC Partners III Co. as of Jun 30, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works
- Institutional holders
- 15
- −14 vs. Q1 2026
- Shares held
- 4.63M
- −4.47M (−49.2%) vs. Q1 2026
- Total value
- $47.3M
- −$43.8M (−48.1%) vs. Q1 2026
- New holders
- 1
- 6 more added
- Sold out
- 15
- 1 more reduced
Compare with Q1 2026: new holders, sold out and not filed yet
Holders and value by quarter
Institutions reporting ARCIU on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.
| Quarter | Holders | Value |
|---|---|---|
| Q2 2026 | 15 | $47.3M |
| Q1 2026 | 29 | $91.0M |
| Q4 2025 | 0 | $0 |
| Q3 2025 | 0 | $0 |
| Q2 2025 | 0 | $0 |
| Q1 2025 | 0 | $0 |
| Q4 2024 | 0 | $0 |
| Q3 2024 | 0 | $0 |
| Q2 2024 | 0 | $0 |
| Q1 2024 | 0 | $0 |
| Q4 2023 | 0 | $0 |
| Q3 2023 | 0 | $0 |
| Q2 2023 | 0 | $0 |
| Q1 2023 | 0 | $0 |
| Q4 2022 | 0 | $0 |
| Q3 2022 | 0 | $0 |
| Q2 2022 | 0 | $0 |
| Q1 2022 | 0 | $0 |
| Q4 2021 | 0 | $0 |
| Q3 2021 | 0 | $0 |
| Q2 2021 | 0 | $0 |
| Q1 2021 | 0 | $0 |
Institutions, Q2 2026
Shares, value and share of portfolio for each institution holding Archimedes Tech SPAC Partners III Co.; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| LMR Partners LLP | 1,250,000 | $12.7M | 0.09% | 00.0% | Unchanged |
| Tudor Investment Corp Et Al | 650,000 | $6.62M | 0.03% | 00.0% | Unchanged |
| Toronto Dominion Bank | 646,217 | $6.59M | 0.01% | +396,217+158.5% | Added |
| Omers Administration Corp | 480,000 | $4.89M | 0.03% | 00.0% | Unchanged |
| Aristeia Capital LLC | 400,779 | $4.08M | 0.06% | +989+0.2% | Added |
| Lineage Point Capital LP | 288,776 | $3.01M | 0.62% | +13,776+5.0% | Added |
| BlueCrest Capital Management Ltd | 275,000 | $2.82M | 0.12% | 00.0% | Unchanged |
| Millennium Management LLC | 179,743 | $1.83M | 0.00% | −170,257−48.6% | Reduced |
| Qube Research & Technologies Ltd | 150,000 | $1.54M | 0.00% | 00.0% | Unchanged |
| Calamos Advisors LLC | 124,000 | $1.29M | 0.00% | 00.0% | Unchanged |
| Westchester Capital Management, LLC | 100,000 | $1.02M | 0.05% | 00.0% | Unchanged |
| Clear Street Group Inc. | 34,256 | $349.1K | 0.00% | +24,194+240.4% | Added |
| HRT Financial LP | 25,000 | $256.0K | 0.00% | +40.0% | Added |
| Glazer Capital, LLC | 10,523 | $110.0K | 0.00% | +10,523 | New |
| Tuttle Tactical Management | 10,769 | $109.4K | 0.07% | +769+7.7% | Added |
| Alberta Investment Management Corp | 0 | $0 | 0.00% | −1,000,000−100.0% | Sold out |
| CNH Partners LLC | 0 | $0 | 0.00% | −757,625−100.0% | Sold out |
| Rivernorth Capital Management, LLC | 0 | $0 | 0.00% | −500,000−100.0% | Sold out |
| Lighthouse Investment Partners, LLC | 0 | $0 | 0.00% | −500,000−100.0% | Sold out |
| BNP Paribas Arbitrage, SA | 0 | $0 | 0.00% | −492,375−100.0% | Sold out |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 0 | $0 | 0.00% | −400,000−100.0% | Sold out |
| MMCAP International Inc. SPC | 0 | $0 | 0.00% | −300,000−100.0% | Sold out |
| Schonfeld Strategic Advisors LLC | 0 | $0 | 0.00% | −236,368−100.0% | Sold out |
| Wealthspring Capital LLC | 0 | $0 | 0.00% | −166,480−100.0% | Sold out |
| Picton Mahoney Asset Management | 0 | $0 | 0.00% | −150,000−100.0% | Sold out |
| Boothbay Fund Management, LLC | 0 | $0 | 0.00% | −100,000−100.0% | Sold out |
| Bulldog Investors, LLP | 0 | $0 | 0.00% | −67,500−100.0% | Sold out |
| Abc Arbitrage SA | 0 | $0 | 0.00% | −40,000−100.0% | Sold out |
| Prelude Capital Management, LLC | 0 | $0 | 0.00% | −20,000−100.0% | Sold out |
| Stoic Point Capital Management LLC | 0 | $0 | 0.00% | −20,000−100.0% | Sold out |