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, 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
- 52
- +12 vs. Q1 2026
- Shares held
- 20.2M
- +4.67M (+30.0%) vs. Q1 2026
- Total value
- $202.6M
- +$49.3M (+32.2%) vs. Q1 2026
- New holders
- 16
- 9 more added
- Sold out
- 4
- 4 more reduced
Compare with Q1 2026: 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, 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 |
|---|---|---|---|---|---|
| Adage Capital Partners GP, L.L.C. | 1,800,000 | $18.0M | 0.03% | 00.0% | Unchanged |
| Linden Advisors LP | 1,200,000 | $12.0M | 0.06% | 00.0% | Unchanged |
| Magnetar Financial LLC | 1,200,000 | $12.0M | 0.11% | 00.0% | Unchanged |
| Governors Lane LP | 1,146,610 | $11.5M | 1.15% | +146,610+14.7% | Added |
| Tenor Capital Management Co., L.P. | 1,000,000 | $10.0M | 0.14% | 00.0% | Unchanged |
| Alberta Investment Management Corp | 1,000,000 | $10.0M | 0.06% | +1,000,000 | New |
| Verition Fund Management LLC | 815,355 | $8.16M | 0.06% | +65,355+8.7% | Added |
| Sona Asset Management (US) LLC | 800,000 | $8.01M | 0.30% | 00.0% | Unchanged |
| CNH Partners LLC | 757,612 | $7.58M | 0.11% | +757,612 | New |
| Healthcare of Ontario Pension Plan Trust Fund | 550,000 | $5.51M | 0.01% | 00.0% | Unchanged |
| Shaolin Capital Management LLC | 510,386 | $5.11M | 0.29% | −30,068−5.6% | Reduced |
| Rivernorth Capital Management, LLC | 500,000 | $5.08M | 0.24% | +500,000 | New |
| Radcliffe Capital Management, L.P. | 504,673 | $5.05M | 0.38% | +90,376+21.8% | Added |
| Polar Asset Management Partners Inc. | 500,000 | $5.00M | 0.09% | 00.0% | Unchanged |
| Moore Capital Management, LP | 500,000 | $5.00M | 0.11% | 00.0% | Unchanged |
| Glazer Capital, LLC | 496,809 | $4.97M | 0.12% | −7,793−1.5% | Reduced |
| BNP Paribas Arbitrage, SA | 492,372 | $4.93M | 0.00% | +492,372 | New |
| D. E. Shaw & Co., Inc. | 450,500 | $4.51M | 0.00% | +25,500+6.0% | Added |
| Meteora Capital, LLC | 424,489 | $4.25M | 0.35% | −59,251−12.2% | Reduced |
| Periscope Capital Inc. | 409,001 | $4.09M | 0.65% | 00.0% | Unchanged |
| Commonwealth of Pennsylvania Public School Empls Retrmt Sys | 400,000 | $4.00M | 0.02% | +400,000 | New |
| K2 Principal Fund, L.P. | 308,333 | $3.09M | 0.28% | +8,797+2.9% | Added |
| Hudson Bay Capital Management LP | 300,000 | $3.00M | 0.01% | 00.0% | Unchanged |
| MMCAP International Inc. SPC | 300,000 | $3.00M | 0.25% | +300,000 | New |
| Schonfeld Strategic Advisors LLC | 297,404 | $2.98M | 0.02% | +297,404 | New |
| Two Sigma Investments, LP | 273,791 | $2.74M | 0.00% | 00.0% | Unchanged |
| HBK Investments L P | 250,004 | $2.50M | 0.03% | 00.0% | Unchanged |
| Ghisallo Capital Management LLC | 250,000 | $2.50M | 0.05% | 00.0% | Unchanged |
| Berkley W R Corp | 248,000 | $2.48M | 0.12% | 00.0% | Unchanged |
| 683 Capital Management, LLC | 200,000 | $2.00M | 0.18% | 00.0% | Unchanged |
| Vivaldi Asset Management, LLC | 200,000 | $2.00M | 0.12% | 00.0% | Unchanged |
| Mangrove Partners | 200,000 | $2.00M | 0.13% | +200,000 | New |
| Toronto Dominion Bank | 175,916 | $1.76M | 0.00% | +80,518+84.4% | Added |
| DLD Asset Management, LP | 170,000 | $1.70M | 0.14% | 00.0% | Unchanged |
| Wealthspring Capital LLC | 160,960 | $1.61M | 0.36% | +160,960 | New |
| Mint Tower Capital Management B.V. | 150,000 | $1.50M | 0.18% | 00.0% | Unchanged |
| Millennium Management LLC | 150,000 | $1.50M | 0.00% | +150,000 | New |
| Picton Mahoney Asset Management | 149,996 | $1.50M | 0.01% | +149,996 | New |
| StoneX Group Inc. | 150,309 | $1.50M | 0.06% | +40,564+37.0% | Added |
| Clear Street Group Inc. | 147,610 | $1.48M | 0.00% | −93,153−38.7% | Reduced |
| Whitebox Advisors LLC | 100,000 | $1.00M | 0.02% | 00.0% | Unchanged |
| Context Capital Management, LLC | 100,000 | $1.00M | 0.02% | 00.0% | Unchanged |
| Boothbay Fund Management, LLC | 95,000 | $951.0K | 0.02% | +95,000 | New |
| JPMorgan Chase & Co | 87,664 | $876.6K | 0.00% | 00.0% | Unchanged |
| L1 Global Manager Pty Ltd | 75,000 | $750.8K | 0.61% | 00.0% | Unchanged |
| Centiva Capital, LP | 70,050 | $701.2K | 0.02% | +70,050 | New |
| Bulldog Investors, LLP | 64,500 | $645.6K | 0.14% | +64,500 | New |
| Deltec Asset Management LLC | 35,000 | $350.4K | 0.05% | 00.0% | Unchanged |
| Abc Arbitrage SA | 35,000 | $350.4K | 0.04% | +35,000 | New |
| Wolverine Asset Management LLC | 32,947 | $329.8K | 0.00% | +22,860+226.6% | Added |
| SRS Capital Advisors, Inc. | 1,500 | $15.0K | 0.00% | +1,500 | New |
| Morgan Stanley | 24 | $240 | 0.00% | +7+41.2% | Added |
| Alpine Global Management, LLC | 0 | $0 | 0.00% | −150,000−100.0% | Sold out |
| Virtu Financial LLC | 0 | $0 | 0.00% | −90,734−100.0% | Sold out |
| Parallax Volatility Advisers, L.P. | 0 | $0 | 0.00% | −50,000−100.0% | Sold out |
| Royal Bank of Canada | 0 | $0 | 0.00% | −2,700−100.0% | Sold out |