What Changed
Price Move History
- Daily moves over 5%
- 0 75 sessions, January 23, 2026 to September 10, 2026
- Largest daily move
- +2.4% close of July 21, 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 $10.40 on September 10, 2026. Over the past month, the price has gained 0.2%.
ARCIU Metrics & Rankings
Price returns through September 10, 2026. Month-to-date and YTD 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 5 recent SEC filings, including 2 Form 10-Q, 1 Form 3, 1 Form 8-K, 1 Form SCHEDULE 13G. The most recent filing was submitted on August 13, 2026. SEC filings provide transparency into a company's financial condition, material events, and regulatory compliance. View all ARCIU SEC filings →
Financial Highlights
Upcoming Events
Short Interest History
Short interest in Archimedes Tech SPAC Partners III Co. Units (ARCIU) currently stands at 1.1 thousand shares, up 4.0% from the previous reporting period. Since January 2026, short interest has increased by 281.4%. With 15.9 days to cover, it would take significant time for short sellers to close their positions based on average trading volume.
Days to Cover History
Days to cover for Archimedes Tech SPAC Partners III Co. Units (ARCIU) currently stands at 15.9 days, down 67.4% from the previous period. This elevated days-to-cover ratio indicates it would take over two weeks of average trading volume for short sellers to exit their positions, suggesting potential for a short squeeze if positive news emerges. The days to cover has increased 1494% over the past year, indicating improving liquidity conditions. The ratio has shown significant volatility over the period, ranging 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.