What Changed
Price Move History
- Daily moves over 5%
- 0 81 sessions, January 23, 2026 to November 5, 2026
- Largest daily move
- +2.4% close of July 21, 2026
- 1-month change
- -1% closing prices, October 5, 2026 to November 5, 2026
Company Description
Archimedes Tech SPAC Partners III Co. is a Cayman Islands blank-check company whose Nasdaq-listed units trade under the symbol ARCIU. The company is organized as a special purpose acquisition company, or SPAC, rather than as an operating business with products or service revenue. Its corporate purpose is to use capital raised from public and private securities offerings to pursue a business combination, subject to the capital-structure, trust-account, redemption, shareholder-vote and governance mechanics that apply to SPAC issuers.
The company's public security structure includes units, ordinary shares and warrants. Each ARCIU unit consists of one ordinary share, par value $0.0001 per share, and one-fourth of one redeemable warrant. The ordinary shares are registered under the symbol ARCI, and the warrants are registered under the symbol ARCIW. The company has disclosed that the ordinary shares and warrants included in the units may trade separately, while unseparated units continue to trade as units.
Archimedes Tech SPAC Partners III Co. completed an initial public offering of units and a concurrent private placement of private units. Proceeds from the public offering and private placement were deposited into a trust account established for the benefit of public shareholders. The sponsor identified in the filing record is Archimedes Tech SPAC Sponsors III LLC, and BTIG, LLC participated in the private placement as the representative of the underwriters in the initial public offering.
As a SPAC, the company's disclosures focus on security structure, trust-account funding, redemption mechanics, shareholder voting matters, sponsor economics, Nasdaq-listed securities and board or officer governance events. The company is incorporated in the Cayman Islands and lists Claymont, Delaware as its U.S. office location. It also reports emerging growth company status under U.S. securities regulations.
Stock Performance
Archimedes Tech SPAC Partners III Co. Units (ARCIU) closed at $10.14 on November 5, 2026. Over the past month, the price has lost 1.0%.
ARCIU Metrics & Rankings
Price returns through November 5, 2026. Month and year figures include the first trading day. Ranking links may use different dates.
Latest News
Archimedes Tech SPAC Partners III Co. Units has 2 recent news articles. Of the recent coverage, 1 article coincided with positive price movement and 0 with negative movement. Key topics include IPO, offering. View all ARCIU news →
SEC Filings
Archimedes Tech SPAC Partners III Co. Units has filed 9 recent SEC filings, including 4 Form 8-K, 2 Form 10-Q, 1 Form 3, 1 Form SCHEDULE 13G. The most recent filing was submitted on . SEC filings provide transparency into a company's financial condition, material events, and regulatory compliance. View all ARCIU SEC filings →
Short Interest History
Short interest in Archimedes Tech SPAC Partners III Co. Units (ARCIU) currently stands at 297 shares, up 10.4% from the previous reporting period.
Days to Cover History
Days to cover for Archimedes Tech SPAC Partners III Co. Units (ARCIU) currently stands at 2.4 days, up 136% from the previous period. The ratio is the reported short interest divided by the average daily trading volume. Since January 2026, the figure has increased by 136%. Across the settlements charted above, it has ranged from 1.0 to 48.9 days.
ARCIU Company Profile & Sector Positioning
Archimedes Tech SPAC Partners III Co. Units (ARCIU) operates in the Shell Companies industry within the broader Financial Services sector and is listed on the NASDAQ.
Investors comparing ARCIU often look at related companies in the same sector, including Blue Water Acquisition Corp. IV (BWIV), Churchill Capital Corp XI (CCXI), SIM Acquisition Corp. I (SIMA), Future Money Acquisition Corporation Units (FMACU), and Idea Acquisition Corp. Units (IACOU). Comparing financial metrics, valuation ratios, and stock performance across these peers can help investors evaluate ARCIU's relative position within its industry.