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.
Key figures
- Insider buysOpen market, last 90 days
- 0
- Insider sellsOpen market, last 90 days
- 0
- 13F holdersQ2 2026, −14 vs. previous quarter
- 15
- 13F valueReported value at the end of Q2 2026
- $47.3M
- Superinvestors holdingAt the end of Q2 2026
- 0
Price chart
Superinvestors holding ARCIU, Q2 2026
No superinvestor reported holding ARCIU 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 |
|---|---|---|---|---|---|
| LMR Partners LLP | 1,250,000 | $12.7M | 0.09% | 00.0% | Unchanged |
| Tudor Investment Corp Et Al | 650,000 | $6.62M | 0.03% | 00.0% | Unchanged |
| Toronto Dominion Bank | 646,217 | $6.59M | 0.01% | +396,217+158.5% | Added |
| Omers Administration Corp | 480,000 | $4.89M | 0.03% | 00.0% | Unchanged |
| Aristeia Capital LLC | 400,779 | $4.08M | 0.06% | +989+0.2% | Added |
| Lineage Point Capital LP | 288,776 | $3.01M | 0.62% | +13,776+5.0% | Added |
| BlueCrest Capital Management Ltd | 275,000 | $2.82M | 0.12% | 00.0% | Unchanged |
| Millennium Management LLC | 179,743 | $1.83M | 0.00% | −170,257−48.6% | Reduced |
| Qube Research & Technologies Ltd | 150,000 | $1.54M | 0.00% | 00.0% | Unchanged |
| Calamos Advisors LLC | 124,000 | $1.29M | 0.00% | 00.0% | Unchanged |