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.
Key figures
- Insider buysOpen market, last 90 days
- 0
- Insider sellsOpen market, last 90 days
- 0
- 13F holdersQ2 2026, +12 vs. previous quarter
- 52
- 13F valueReported value at the end of Q2 2026
- $202.6M
- Superinvestors holdingAt the end of Q2 2026
- 0
Price chart
Superinvestors holding ARCI, Q2 2026
No superinvestor reported holding ARCI at the end of Q2 2026.
Latest insider trades
Open-market purchases and sales by Archimedes Tech SPAC Partners III Co. insiders from Form 4, newest first.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Jan 26, 2026 (view filing) | Jan 26 | Same day | Archimedes Tech SPAC Sponsors III LLC10% Owner | PPurchase | +390.0K | – | – | New position390.0K after | Duplicate filing |
| Jan 26, 2026 (view filing) | Jan 26 | Same day | Archimedes Tech SPAC Sponsors III LLC10% Owner | PPurchase | +97.5K | – | – | –97.5K after | DerivativeDuplicate filing |
| Jan 26, 2026 (view filing) | Jan 26 | Same day | Long LongChief Executive Officer | PPurchase | +390.0K | – | – | New position390.0K after | |
| Jan 26, 2026 (view filing) | Jan 26 | Same day | Long LongChief Executive Officer | PPurchase | +97.5K | – | – | –97.5K after | Derivative |
Top 10 13F holders, Q2 2026
The largest institutional positions in Archimedes Tech SPAC Partners III Co. at the end of Q2 2026; 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 |