ARCINasdaqBlank ChecksFiscal year ends December 31Also trades as ARCIU, ARCIW
Archimedes Tech SPAC Partners III Co.
Financials through Q2 FY2026, quarter ended Jun 30, 2026Last filing: 10-Q on Aug 13, 2026
$10.04+0.00 (0.00%)
Close on Oct 19, 2026
- Market cap
- –
- P/E (TTM)
- –
- Dividend yield
- –
Ownership
Institutional holdings as of Jun 30, 2026, from 13F filings
Held by institutions
20M
Shares held, 13F filers
Institutional holders
52
16 new, 4 sold out
Net institutional buying
5M
In Q2 2026
Insider trades, 12 months
2 buys · 0 sales
Net bought $0
Shares held by institutions
Holders of more than 5%
Latest Schedule 13D (active) or 13G (passive) filed by each holder
| Holder | Shares | % of class | Filing | As of |
|---|---|---|---|---|
| Adage Capital Management, L.P. | 1,800,000 | 5.10% | 13G (passive) | Mar 31, 2026 |
Top institutional holders
13F holdings as of Jun 30, 2026
| Holder | Shares | % of ARCI | Value | Change | % of portfolio |
|---|---|---|---|---|---|
| Adage Capital Partners Gp, L.L.C. | 1,800,000 | – | $18.02M | – | 0.03% |
| Magnetar Financial LLC | 1,200,000 | – | $12.01M | – | 0.11% |
| Linden Advisors LP | 1,200,000 | – | $12.01M | – | 0.06% |
| Governors Lane LP | 1,146,610 | – | $11.48M | +146,610 | 0.96% |
| Alberta Investment Management Corp | 1,000,000 | – | $10.01M | New | 0.06% |
| TENOR CAPITAL MANAGEMENT Co., L.P. | 1,000,000 | – | $10.01M | – | 0.14% |
| Verition Fund Management LLC | 815,355 | – | $8.16M | +65,355 | 0.04% |
| Sona Asset Management (US) LLC | 800,000 | – | $8.01M | – | 0.17% |
| AQR Arbitrage LLC | 757,612 | – | $7.58M | New | 0.11% |
| Healthcare Of Ontario Pension Plan Trust Fund | 550,000 | – | $5.51M | – | 0.01% |
| Shaolin Capital Management LLC | 510,386 | – | $5.11M | −30,068 | 0.24% |
| Radcliffe Capital Management, L.P. | 504,673 | – | $5.05M | +90,376 | 0.38% |
| Rivernorth Capital Management, LLC | 500,000 | – | $5.09M | New | 0.24% |
| Polar Asset Management Partners Inc. | 500,000 | – | $5.01M | – | 0.08% |
| Moore Capital Management, LP | 500,000 | – | $5.01M | – | 0.07% |
| Glazer Capital, LLC | 496,809 | – | $4.97K | −7,793 | 0.12% |
| Bnp Paribas Arbitrage, Snc | 492,372 | – | $4.93M | New | 0.00% |
| D. E. Shaw & Co., Inc. | 450,500 | – | $4.51M | +25,500 | 0.00% |
| Meteora Capital, LLC | 424,489 | – | $4.25M | −59,251 | 0.35% |
| Periscope Capital Inc. | 409,001 | – | $4.09M | – | 0.36% |
Institutional buying and selling by quarter
Positions opened, added to, reduced and closed by 13F filers
| Quarter | Holders | Shares held | New / added | Reduced / closed | Shares bought | Shares sold |
|---|---|---|---|---|---|---|
| Q2 2026 | 52 | 20M | 16 / 9 | 4 / 4 | 5M | 0M |
| Q1 2026 | 40 | 16M | 40 / 0 | 0 / 0 | 16M | 0M |
Top mutual fund and ETF holders
Latest monthly portfolio reports (Form N-PORT)
| Fund | Shares | % of ARCI | Value | % of fund | As of |
|---|---|---|---|---|---|
| First Trust Merger Arbitrage Fund | 171,728 | – | $1.72M | 0.11% | Jun 30, 2026 |
| First Trust Multi-Strategy Fund | 27,224 | – | $272.51K | 0.02% | Jun 30, 2026 |
Officers, directors and major owners
People who filed Forms 3, 4 or 5 in the last two years
| Name | Role | Shares owned | Latest filing |
|---|---|---|---|
| Long Long | Chief Executive Officer, Director, 10% owner | 390,000 | Jan 26, 2026 |
| Kai Ming Chan | Chief Financial Officer | – | Jan 23, 2026 |
| Ben Landen | Chief Technology Officer | – | Jan 23, 2026 |
| Stephen N. Cannon | Director | – | Jul 17, 2026 |
| Eric R. Ball | Director | – | Jan 23, 2026 |
| Vishwesh Pai | Director | – | Jan 23, 2026 |
| Daniel L. Sheehan | Director | – | Jan 23, 2026 |
| Tech SPAC Sponsors III LLC Archimedes | 10% owner | 390,000 | Jan 26, 2026 |
Insider trades
Common stock transactions reported on Form 4, newest first
| Insider | Date | Transaction | Shares | Price | Value | Shares after |
|---|---|---|---|---|---|---|
| Tech SPAC Sponsors III LLC Archimedes 10% owner | Jan 26, 2026 | Buy | +390,000 | – | – | 390,000 |
| Long Long Chief Executive Officer, Director, 10% owner | Jan 26, 2026 | Buy | +390,000 | – | – | 390,000 |
Awards, option exercises, tax withholding and gifts are shown alongside open-market buys and sales. Each name links to the filing on SEC EDGAR.