ARCI Archimedes Tech SPAC Partners III Co.: institutional ownership and insider trading
53 funds reported holding $204M of Archimedes Tech SPAC Partners III Co. in their latest 13F filings; in Q2 2026 funds net bought $46.8M, with 16 new positions and 4 funds selling out; over the last 12 months insiders bought $0 and sold $0 on the open market.
Famous investors holding ARCI
- D. E. Shaw (D. E. Shaw & Co.): $4.51M, 0.0% of the portfolio
- Two Sigma (Two Sigma Investments): $2.74M, 0.0% of the portfolio
- Izzy Englander (Millennium Management): $1.50M, 0.0% of the portfolio
Largest institutional holders of ARCI
- ADAGE CAPITAL PARTNERS GP, L.L.C. — $18.0M
- LINDEN ADVISORS LP — $12.0M
- Magnetar Financial LLC — $12.0M
- Governors Lane LP — $11.5M
- TENOR CAPITAL MANAGEMENT Co., L.P. — $10.0M
- Alberta Investment Management Corp — $10.0M
- Verition Fund Management LLC — $8.16M
- SONA ASSET MANAGEMENT (US) LLC — $8.01M
- AQR Arbitrage LLC — $7.58M
- HEALTHCARE OF ONTARIO PENSION PLAN TRUST FUND — $5.51M
Recent ARCI insider trades
- Jan 26, 2026: Archimedes Tech SPAC Sponsors III LLC bought 390,000 shares ($0)
- Jan 26, 2026: Long Long bought 390,000 shares ($0)
5%+ owners
- Adage Capital Management, L.P.: 5.1% (Schedule 13G, filed May 13, 2026)