Here are the 424B prospectus supplements from Arqit Quantum Inc. (ARQQ) in our archive over the last 12 months, newest first, and each one links through to the document itself with the summary and the scores our analysis gives it.
A 424B covers the supplement that carries the terms of a priced offering, so if you follow ARQQ and want that one kind of document rather than the whole filing history, this is the page to keep. The company's other filings, of every form, are on the full ARQQ filings page.
Arqit Quantum Inc. files a prospectus supplement updating a resale registration covering 4,717,000 Ordinary Shares and 6,266,667 warrants, and noting 595,666 Ordinary Shares issuable upon exercise of registered warrants.
The supplement updates the selling securityholders table to reflect permitted sales and distributions and states the share counts reflect a 25-to-1 reverse share split effected on September 25, 2024. The table bases percentages on 24,090,585 ordinary shares outstanding as of May 19, 2026.
Arqit Quantum Inc. is launching an at-the-market offering of up to $125,000,000 of its ordinary shares under a sales agreement with Cantor Fitzgerald & Co. and H.C. Wainwright & Co., LLC. The shares may be sold from time to time on Nasdaq or through other permitted methods at prevailing market, related or negotiated prices, and the agents will receive up to 3.0% of the gross sales price as compensation.
Arqit plans to use net proceeds for general corporate purposes, including continued product development and commercialization, potential acquisitions and other business opportunities, and repayment of indebtedness. As of September 30, 2025, it had 15,291,767 ordinary shares outstanding, so additional issuances under this program would dilute existing holders.
The company highlights risks that the actual number of shares sold and gross proceeds may be lower than $125.0 million, that investors buying at different times may pay different prices and experience varying dilution, and that future equity or equity-linked financings could further pressure the share price. As a foreign private issuer and emerging growth company, Arqit also benefits from reduced U.S. reporting requirements.