Archimedes Tech SPAC Partners III Co. Ordinary Share (ARCI)
Special purpose acquisition company
Archimedes Tech SPAC Partners III Co. Ordinary Share (ARCI) is listed on Nasdaq, where it has traded since March 16, 2026.
- Type
- Special purpose acquisition company
- Listed On
- Nasdaq
- Listed Since
- March 16, 2026
- Market Cap
- $355M
About Archimedes Tech SPAC Partners III Co. Ordinary Share
Archimedes Tech SPAC Partners III Co is a blank check company.
Institutional ownership
In 13F filings for the quarter ended June 30, 2026, 50 institutions reported holding ARCI, with 20.0 million shares worth $199.8 million in aggregate. The largest reported holder was Adage Capital Partners GP, with 1.8 million shares worth $18.0 million. Of the 5 largest holders listed below, 1 opened a new position in ARCI, 1 added shares and 3 held their positions unchanged during the quarter.
| Institution | Shares | Value | Quarter change |
|---|---|---|---|
| Adage Capital Partners GP | 1,800,000 | $18M | Unchanged |
| Linden Advisors | 1,200,000 | $12M | Unchanged |
| Magnetar Financial | 1,200,000 | $12M | Unchanged |
| Governors Lane | 1,146,610 | $11M | Added 14.66% |
| Alberta Investment Management | 1,000,000 | $10M | New position |
Form 13F is a quarterly report that institutional investment managers with at least $100 million in qualifying securities file with the SEC. It lists long positions as of the last day of the quarter and is due within 45 days of quarter end, so these holdings describe that date rather than today.
Frequently asked questions
What is ARCI?
Archimedes Tech SPAC Partners III Co. Ordinary Share (ARCI) is listed on Nasdaq, where it has traded since March 16, 2026.
Who are the largest institutional holders of ARCI?
In 13F filings for the quarter ended June 30, 2026, the largest reported holders of ARCI were Adage Capital Partners GP, Linden Advisors and Magnetar Financial.
How many institutions own ARCI?
50 institutions reported a position in ARCI for the quarter ended June 30, 2026, worth $199.8 million in total.
Did institutions buy or sell ARCI last quarter?
Of the 5 largest reported holders, 1 opened a new position in ARCI, 1 added shares and 3 held their positions unchanged during the quarter. Every reported holder and its change is on the SentiSense ownership page for ARCI.
Every reported institutional holder, plus insider and congressional trades in ARCI, on SentiSense.