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, Q1 2026
Institutional positions in Archimedes Tech SPAC Partners III Co. as of Mar 31, 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
- 29
- +29 vs. Q4 2025
- Shares held
- 9.10M
- +9.10M vs. Q4 2025
- Total value
- $91.0M
- +$91.0M vs. Q4 2025
- New holders
- 29
- 0 more added
- Sold out
- 0
- 0 more reduced
Compare with Q4 2025: 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, Q1 2026
Shares, value and share of portfolio for each institution holding Archimedes Tech SPAC Partners III Co.; share changes are against Q4 2025.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| LMR Partners LLP | 1,250,000 | $12.5M | 0.12% | +1,250,000 | New |
| Alberta Investment Management Corp | 1,000,000 | $10.0M | 0.06% | +1,000,000 | New |
| CNH Partners LLC | 757,625 | $7.56M | 0.12% | +757,625 | New |
| Tudor Investment Corp Et Al | 650,000 | $6.50M | 0.03% | +650,000 | New |
| Rivernorth Capital Management, LLC | 500,000 | $5.00M | 0.25% | +500,000 | New |
| Lighthouse Investment Partners, LLC | 500,000 | $5.00M | 0.19% | +500,000 | New |
| BNP Paribas Arbitrage, SA | 492,375 | $4.92M | 0.00% | +492,375 | New |
| Omers Administration Corp | 480,000 | $4.80M | 0.03% | +480,000 | New |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 400,000 | $4.00M | 0.02% | +400,000 | New |
| Aristeia Capital LLC | 399,790 | $4.00M | 0.09% | +399,790 | New |
| Millennium Management LLC | 350,000 | $3.50M | 0.00% | +350,000 | New |
| MMCAP International Inc. SPC | 300,000 | $3.00M | 0.26% | +300,000 | New |
| BlueCrest Capital Management Ltd | 275,000 | $2.76M | 0.26% | +275,000 | New |
| Lineage Point Capital LP | 275,000 | $2.75M | 0.67% | +275,000 | New |
| Toronto Dominion Bank | 250,000 | $2.50M | 0.00% | +250,000 | New |
| Schonfeld Strategic Advisors LLC | 236,368 | $2.36M | 0.02% | +236,368 | New |
| Wealthspring Capital LLC | 166,480 | $1.66M | 0.40% | +166,480 | New |
| Qube Research & Technologies Ltd | 150,000 | $1.50M | 0.00% | +150,000 | New |
| Picton Mahoney Asset Management | 150,000 | $1.50M | 0.02% | +150,000 | New |
| Calamos Advisors LLC | 124,000 | $1.24M | 0.00% | +124,000 | New |
| Boothbay Fund Management, LLC | 100,000 | $1.00M | 0.02% | +100,000 | New |
| Westchester Capital Management, LLC | 100,000 | $998.0K | 0.05% | +100,000 | New |
| Bulldog Investors, LLP | 67,500 | $674.3K | 0.15% | +67,500 | New |
| Abc Arbitrage SA | 40,000 | $400.0K | 0.05% | +40,000 | New |
| HRT Financial LP | 24,996 | $250.0K | 0.00% | +24,996 | New |
| Prelude Capital Management, LLC | 20,000 | $200.0K | 0.02% | +20,000 | New |
| Stoic Point Capital Management LLC | 20,000 | $200.0K | 0.20% | +20,000 | New |
| Clear Street Group Inc. | 10,062 | $100.6K | 0.00% | +10,062 | New |
| Tuttle Tactical Management | 10,000 | $99.8K | 0.16% | +10,000 | New |