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 |
|---|---|---|---|---|---|
| Tuttle Tactical Management | 10,000 | $99.8K | 0.16% | +10,000 | New |
| Clear Street Group Inc. | 10,062 | $100.6K | 0.00% | +10,062 | 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 |
| HRT Financial LP | 24,996 | $250.0K | 0.00% | +24,996 | New |
| Abc Arbitrage SA | 40,000 | $400.0K | 0.05% | +40,000 | New |
| Bulldog Investors, LLP | 67,500 | $674.3K | 0.15% | +67,500 | New |
| Westchester Capital Management, LLC | 100,000 | $998.0K | 0.05% | +100,000 | New |
| Boothbay Fund Management, LLC | 100,000 | $1.00M | 0.02% | +100,000 | New |
| Calamos Advisors LLC | 124,000 | $1.24M | 0.00% | +124,000 | New |
| Picton Mahoney Asset Management | 150,000 | $1.50M | 0.02% | +150,000 | New |
| Qube Research & Technologies Ltd | 150,000 | $1.50M | 0.00% | +150,000 | New |
| Wealthspring Capital LLC | 166,480 | $1.66M | 0.40% | +166,480 | New |
| Schonfeld Strategic Advisors LLC | 236,368 | $2.36M | 0.02% | +236,368 | New |
| Toronto Dominion Bank | 250,000 | $2.50M | 0.00% | +250,000 | New |
| Lineage Point Capital LP | 275,000 | $2.75M | 0.67% | +275,000 | New |
| BlueCrest Capital Management Ltd | 275,000 | $2.76M | 0.26% | +275,000 | New |
| MMCAP International Inc. SPC | 300,000 | $3.00M | 0.26% | +300,000 | New |
| Millennium Management LLC | 350,000 | $3.50M | 0.00% | +350,000 | New |
| Aristeia Capital LLC | 399,790 | $4.00M | 0.09% | +399,790 | New |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 400,000 | $4.00M | 0.02% | +400,000 | New |
| Omers Administration Corp | 480,000 | $4.80M | 0.03% | +480,000 | New |
| BNP Paribas Arbitrage, SA | 492,375 | $4.92M | 0.00% | +492,375 | 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 |
| Tudor Investment Corp Et Al | 650,000 | $6.50M | 0.03% | +650,000 | New |
| CNH Partners LLC | 757,625 | $7.56M | 0.12% | +757,625 | New |
| Alberta Investment Management Corp | 1,000,000 | $10.0M | 0.06% | +1,000,000 | New |
| LMR Partners LLP | 1,250,000 | $12.5M | 0.12% | +1,250,000 | New |