Archimedes Tech SPAC Partners III Co.
ARCI- 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; 52 institutions reported holding it in 13F filings for Q2 2026, worth $202.6M 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
- 40
- +40 vs. Q4 2025
- Shares held
- 15.6M
- +15.6M vs. Q4 2025
- Total value
- $153.3M
- +$153.3M vs. Q4 2025
- New holders
- 40
- 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 ARCI 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 | 52 | $202.6M |
| Q1 2026 | 40 | $153.3M |
| 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 |
|---|---|---|---|---|---|
| Adage Capital Partners GP, L.L.C. | 1,800,000 | $17.7M | 0.03% | +1,800,000 | New |
| Linden Advisors LP | 1,200,000 | $11.8M | 0.07% | +1,200,000 | New |
| Magnetar Financial LLC | 1,200,000 | $11.8M | 0.12% | +1,200,000 | New |
| Tenor Capital Management Co., L.P. | 1,000,000 | $9.85M | 0.15% | +1,000,000 | New |
| Governors Lane LP | 1,000,000 | $9.85M | 1.23% | +1,000,000 | New |
| Sona Asset Management (US) LLC | 800,000 | $7.88M | 0.30% | +800,000 | New |
| Verition Fund Management LLC | 750,000 | $7.39M | 0.07% | +750,000 | New |
| Healthcare of Ontario Pension Plan Trust Fund | 550,000 | $5.42M | 0.01% | +550,000 | New |
| Shaolin Capital Management LLC | 540,454 | $5.32M | 0.22% | +540,454 | New |
| Glazer Capital, LLC | 504,602 | $4.97M | 0.11% | +504,602 | New |
| Polar Asset Management Partners Inc. | 500,000 | $4.92M | 0.12% | +500,000 | New |
| Moore Capital Management, LP | 500,000 | $4.92M | 0.18% | +500,000 | New |
| Meteora Capital, LLC | 483,740 | $4.76M | 0.35% | +483,740 | New |
| D. E. Shaw & Co., Inc. | 425,000 | $4.19M | 0.00% | +425,000 | New |
| Radcliffe Capital Management, L.P. | 414,297 | $4.08M | 0.31% | +414,297 | New |
| Periscope Capital Inc. | 409,001 | $4.03M | 0.70% | +409,001 | New |
| Hudson Bay Capital Management LP | 300,000 | $2.96M | 0.02% | +300,000 | New |
| K2 Principal Fund, L.P. | 299,536 | $2.95M | 0.31% | +299,536 | New |
| Two Sigma Investments, LP | 273,791 | $2.70M | 0.00% | +273,791 | New |
| HBK Investments L P | 250,004 | $2.46M | 0.03% | +250,004 | New |
| Ghisallo Capital Management LLC | 250,000 | $2.46M | 0.07% | +250,000 | New |
| Berkley W R Corp | 248,000 | $2.44M | 0.13% | +248,000 | New |
| Clear Street Group Inc. | 240,763 | $2.37M | 0.01% | +240,763 | New |
| 683 Capital Management, LLC | 200,000 | $1.97M | 0.18% | +200,000 | New |
| Vivaldi Asset Management, LLC | 200,000 | $1.97M | 0.10% | +200,000 | New |
| DLD Asset Management, LP | 170,000 | $1.67M | 0.17% | +170,000 | New |
| Mint Tower Capital Management B.V. | 150,000 | $1.48M | 0.15% | +150,000 | New |
| Alpine Global Management, LLC | 150,000 | $1.48M | 0.22% | +150,000 | New |
| StoneX Group Inc. | 109,745 | $1.08M | 0.06% | +109,745 | New |
| Whitebox Advisors LLC | 100,000 | $985.0K | 0.01% | +100,000 | New |
| Context Capital Management, LLC | 100,000 | $985.0K | 0.02% | +100,000 | New |
| Toronto Dominion Bank | 95,398 | $939.7K | 0.00% | +95,398 | New |
| Virtu Financial LLC | 90,734 | $894.0K | 0.04% | +90,734 | New |
| JPMorgan Chase & Co | 87,664 | $861.7K | 0.00% | +87,664 | New |
| L1 Global Manager Pty Ltd | 75,000 | $738.8K | 0.60% | +75,000 | New |
| Parallax Volatility Advisers, L.P. | 50,000 | $494.5K | 0.02% | +50,000 | New |
| Deltec Asset Management LLC | 35,000 | $344.8K | 0.06% | +35,000 | New |
| Wolverine Asset Management LLC | 10,087 | $99.4K | 0.00% | +10,087 | New |
| Royal Bank of Canada | 2,700 | $27.0K | 0.00% | +2,700 | New |
| Morgan Stanley | 17 | $167 | 0.00% | +17 | New |