Arqit Quantum Inc. SEC filings ARQQ
Arqit Quantum Inc. has 495 filings in SEC EDGAR's recent list, going back to May 12, 2021. Its latest annual report, Form 20-F, was filed on Dec 9, 2025 for the period ended Sep 30, 2025. The most recent current report (Form 6-K) was filed on Oct 8, 2026. The company's fiscal year ends on September 30.
| Form | Description | Filed | Period |
|---|---|---|---|
| 4 | Insider transaction | Oct 20, 2026 | Oct 15, 2026 |
| 4 | Insider transaction | Oct 20, 2026 | Oct 15, 2026 |
| 4 | Insider transaction | Oct 20, 2026 | Oct 15, 2026 |
| 4 | Insider transaction | Oct 15, 2026 | Oct 13, 2026 |
| 4 | Insider transaction | Oct 13, 2026 | Oct 12, 2026 |
| 144 | Notice of proposed sale | Oct 13, 2026 | — |
| 4 | Insider transaction | Oct 8, 2026 | Oct 6, 2026 |
| 4 | Insider transaction | Oct 8, 2026 | Oct 6, 2026 |
| 4 | Insider transaction | Oct 8, 2026 | Oct 6, 2026 |
| 4 | Insider transaction | Oct 8, 2026 | Oct 6, 2026 |
| 4 | Insider transaction | Oct 8, 2026 | Oct 6, 2026 |
| 4 | Insider transaction | Oct 8, 2026 | Oct 6, 2026 |
| 6-K | Current report (foreign issuer) | Oct 8, 2026 | Oct 8, 2026 |
| 4 | Insider transaction | Oct 7, 2026 | Oct 5, 2026 |
| 4 | Insider transaction | Oct 7, 2026 | Oct 5, 2026 |
| 4 | Insider transaction | Oct 7, 2026 | Oct 5, 2026 |
| 4 | Insider transaction | Oct 7, 2026 | Oct 5, 2026 |
| 4 | Insider transaction | Oct 7, 2026 | Oct 5, 2026 |
| 4 | Insider transaction | Oct 7, 2026 | Oct 5, 2026 |
| 4 | Insider transaction | Oct 7, 2026 | Oct 5, 2026 |
| 4 | Insider transaction | Oct 7, 2026 | Oct 5, 2026 |
| 4 | Insider transaction | Oct 6, 2026 | Oct 2, 2026 |
| 4 | Insider transaction | Oct 6, 2026 | Oct 2, 2026 |
| 4 | Insider transaction | Oct 6, 2026 | Oct 2, 2026 |
| 4 | Insider transaction | Oct 6, 2026 | Oct 2, 2026 |
| 4 | Insider transaction | Oct 6, 2026 | Oct 2, 2026 |
| 4 | Insider transaction | Oct 6, 2026 | Oct 2, 2026 |
| 4 | Insider transaction | Oct 6, 2026 | Oct 2, 2026 |
| 4 | Insider transaction | Oct 6, 2026 | Oct 2, 2026 |
| 144 | Notice of proposed sale | Oct 6, 2026 | — |
| 144 | Notice of proposed sale | Oct 6, 2026 | — |
| 144 | Notice of proposed sale | Oct 6, 2026 | — |
| 144 | Notice of proposed sale | Oct 6, 2026 | — |
| 144 | Notice of proposed sale | Oct 6, 2026 | — |
| 144 | Notice of proposed sale | Oct 6, 2026 | — |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 4 | Insider transaction | Oct 5, 2026 | Oct 1, 2026 |
| 144 | Notice of proposed sale | Oct 5, 2026 | — |
| 144 | Notice of proposed sale | Oct 5, 2026 | — |
| 144 | Notice of proposed sale | Oct 5, 2026 | — |
| 144 | Notice of proposed sale | Oct 5, 2026 | — |
| 144 | Notice of proposed sale | Oct 5, 2026 | — |
| 144 | Notice of proposed sale | Oct 5, 2026 | — |
| 144 | Notice of proposed sale | Oct 2, 2026 | — |
| 144 | Notice of proposed sale | Oct 2, 2026 | — |
| 144 | Notice of proposed sale | Oct 2, 2026 | — |
| 144 | Notice of proposed sale | Oct 2, 2026 | — |
| 144 | Notice of proposed sale | Oct 2, 2026 | — |
| 144 | Notice of proposed sale | Oct 2, 2026 | — |
| 4 | Insider transaction | Sep 23, 2026 | Sep 22, 2026 |
| SCHEDULE 13G/A | Amended ownership over 5% (passive) | Sep 10, 2026 | — |
| 6-K | Current report (foreign issuer) | Sep 9, 2026 | Sep 9, 2026 |
| 25-NSE | Delisting notice | Sep 2, 2026 | — |
| 6-K | Current report (foreign issuer) | Aug 19, 2026 | Aug 19, 2026 |
| 4 | Insider transaction | Jul 21, 2026 | Jul 17, 2026 |
| 4 | Insider transaction | Jul 21, 2026 | Jul 17, 2026 |
| 4 | Insider transaction | Jul 21, 2026 | Jul 17, 2026 |
| 4 | Insider transaction | Jul 17, 2026 | Jul 15, 2026 |
| 4 | Insider transaction | Jul 17, 2026 | Jul 15, 2026 |
| 4 | Insider transaction | Jul 17, 2026 | Jul 15, 2026 |
| 4 | Insider transaction | Jul 13, 2026 | Jul 9, 2026 |
| 4 | Insider transaction | Jul 9, 2026 | Jul 7, 2026 |
| 4 | Insider transaction | Jul 7, 2026 | Jul 2, 2026 |
| 4 | Insider transaction | Jul 6, 2026 | Jul 1, 2026 |
| 4 | Insider transaction | Jul 6, 2026 | Jul 1, 2026 |
| 4 | Insider transaction | Jul 6, 2026 | Jul 1, 2026 |
| 4 | Insider transaction | Jul 6, 2026 | Jul 1, 2026 |
| 4 | Insider transaction | Jul 6, 2026 | Jul 1, 2026 |
| 4 | Insider transaction | Jul 6, 2026 | Jul 1, 2026 |
| 4 | Insider transaction | Jul 6, 2026 | Jul 1, 2026 |
| 144 | Notice of proposed sale | Jul 2, 2026 | — |
| 144 | Notice of proposed sale | Jul 2, 2026 | — |
| 144 | Notice of proposed sale | Jul 2, 2026 | — |
| 144 | Notice of proposed sale | Jul 2, 2026 | — |
| 4 | Insider transaction | Jul 2, 2026 | Jun 30, 2026 |
| 144 | Notice of proposed sale | Jul 2, 2026 | — |
| 4 | Insider transaction | Jul 2, 2026 | Jun 30, 2026 |
| 4 | Insider transaction | Jun 30, 2026 | Jun 26, 2026 |
| 144 | Notice of proposed sale | Jun 30, 2026 | — |
| 144 | Notice of proposed sale | Jun 30, 2026 | — |
| 4 | Insider transaction | Jun 26, 2026 | Jun 24, 2026 |
| 4 | Insider transaction | Jun 24, 2026 | Jun 22, 2026 |
| 4 | Insider transaction | Jun 24, 2026 | Jun 22, 2026 |
| SCHEDULE 13G | Ownership over 5% (passive) | Jun 23, 2026 | — |
| 4 | Insider transaction | Jun 22, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Jun 22, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Jun 22, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Jun 17, 2026 | Jun 15, 2026 |
| 144 | Notice of proposed sale | Jun 17, 2026 | — |
| 6-K | Current report (foreign issuer) | Jun 17, 2026 | Jun 17, 2026 |
| 4 | Insider transaction | Jun 15, 2026 | Jun 11, 2026 |
| 4 | Insider transaction | Jun 11, 2026 | Jun 9, 2026 |
| 4 | Insider transaction | Jun 9, 2026 | Jun 5, 2026 |
| 4 | Insider transaction | Jun 5, 2026 | Jun 3, 2026 |
| 4 | Insider transaction | Jun 5, 2026 | Jun 5, 2026 |
| 4 | Insider transaction | Jun 5, 2026 | Jun 3, 2026 |
| 3 | Initial insider ownership | Jun 5, 2026 | Jun 1, 2026 |
| 3 | Initial insider ownership | Jun 5, 2026 | May 1, 2026 |
| 4 | Insider transaction | Jun 3, 2026 | Jun 1, 2026 |
| 4 | Insider transaction | Jun 1, 2026 | May 28, 2026 |
| 4 | Insider transaction | May 28, 2026 | May 26, 2026 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | May 26, 2026 | — |
| 4 | Insider transaction | May 26, 2026 | May 21, 2026 |
| 4 | Insider transaction | May 21, 2026 | May 19, 2026 |
| 424B3 | Prospectus | May 21, 2026 | — |
| 6-K | Current report (foreign issuer) | May 21, 2026 | Mar 31, 2026 |
| 4 | Insider transaction | May 20, 2026 | Apr 20, 2026 |
| 4 | Insider transaction | May 19, 2026 | May 15, 2026 |
| 4 | Insider transaction | May 15, 2026 | May 13, 2026 |
| 4 | Insider transaction | May 13, 2026 | May 12, 2026 |
| 4 | Insider transaction | May 12, 2026 | May 8, 2026 |
| 4 | Insider transaction | May 8, 2026 | May 7, 2026 |
| 4 | Insider transaction | May 8, 2026 | May 6, 2026 |
| 4 | Insider transaction | May 8, 2026 | May 6, 2026 |
| 4 | Insider transaction | May 8, 2026 | May 6, 2026 |
| 4 | Insider transaction | May 6, 2026 | May 4, 2026 |
| 4 | Insider transaction | May 4, 2026 | Apr 30, 2026 |
| 6-K | Current report (foreign issuer) | May 1, 2026 | May 1, 2026 |
| 4 | Insider transaction | Apr 30, 2026 | Apr 29, 2026 |
| 4 | Insider transaction | Apr 29, 2026 | Apr 27, 2026 |
| 4 | Insider transaction | Apr 27, 2026 | Apr 23, 2026 |
| 4 | Insider transaction | Apr 23, 2026 | Apr 21, 2026 |
| 4 | Insider transaction | Apr 21, 2026 | Apr 17, 2026 |
| 144 | Notice of proposed sale | Apr 20, 2026 | — |
| 4 | Insider transaction | Apr 17, 2026 | Apr 15, 2026 |
| 6-K | Current report (foreign issuer) | Apr 13, 2026 | Apr 13, 2026 |
| 4 | Insider transaction | Apr 7, 2026 | Apr 6, 2026 |
| 144 | Notice of proposed sale | Apr 6, 2026 | — |
| 4 | Insider transaction | Apr 3, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 3, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 3, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 3, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 3, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 3, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 3, 2026 | Apr 1, 2026 |
| 4 | Insider transaction | Apr 3, 2026 | Apr 1, 2026 |
| 144 | Notice of proposed sale | Apr 2, 2026 | — |
| 144 | Notice of proposed sale | Apr 2, 2026 | — |
| 144 | Notice of proposed sale | Apr 2, 2026 | — |
| 144 | Notice of proposed sale | Apr 2, 2026 | — |
| 144 | Notice of proposed sale | Apr 2, 2026 | — |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 3 | Initial insider ownership | Mar 18, 2026 | Mar 18, 2026 |
| 6-K | Current report (foreign issuer) | Mar 4, 2026 | Mar 4, 2026 |
| 144 | Notice of proposed sale | Mar 4, 2026 | — |
| 144 | Notice of proposed sale | Feb 25, 2026 | — |
| 144 | Notice of proposed sale | Feb 20, 2026 | — |
| EFFECT | Filing | Jan 26, 2026 | — |
| 424B5 | Prospectus supplement | Jan 26, 2026 | — |
| CORRESP | Letter to the SEC | Jan 23, 2026 | — |
| F-3/A | Filing | Jan 23, 2026 | — |
| UPLOAD | Letter from the SEC | Jan 16, 2026 | — |
| F-3 | Shelf registration (foreign issuer) | Jan 12, 2026 | — |
| 6-K | Current report (foreign issuer) | Jan 12, 2026 | Jan 12, 2026 |
| 144 | Notice of proposed sale | Jan 6, 2026 | — |
| 144 | Notice of proposed sale | Jan 2, 2026 | — |
| 144 | Notice of proposed sale | Jan 2, 2026 | — |
| 144 | Notice of proposed sale | Jan 2, 2026 | — |
| 144 | Notice of proposed sale | Jan 2, 2026 | — |
| 144 | Notice of proposed sale | Jan 2, 2026 | — |
| 144 | Notice of proposed sale | Dec 11, 2025 | — |
| 424B3 | Prospectus | Dec 9, 2025 | — |
| 424B3 | Prospectus | Dec 9, 2025 | — |
| 6-K | Current report (foreign issuer) | Dec 9, 2025 | Dec 9, 2025 |
| 20-F | Annual report (foreign issuer) | Dec 9, 2025 | Sep 30, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Nov 12, 2025 | — |
| 144 | Notice of proposed sale | Nov 4, 2025 | — |
| 6-K | Current report (foreign issuer) | Oct 21, 2025 | Oct 21, 2025 |
| SCHEDULE 13D/A | Amended ownership over 5% (active) | Oct 20, 2025 | — |
| 144 | Notice of proposed sale | Oct 16, 2025 | — |
| 144 | Notice of proposed sale | Oct 15, 2025 | — |
| 144 | Notice of proposed sale | Oct 15, 2025 | — |
| 144 | Notice of proposed sale | Oct 14, 2025 | — |
| 144 | Notice of proposed sale | Oct 14, 2025 | — |
| 6-K | Current report (foreign issuer) | Oct 9, 2025 | Oct 9, 2025 |
| 144 | Notice of proposed sale | Oct 6, 2025 | — |
| 144 | Notice of proposed sale | Oct 6, 2025 | — |
| 144 | Notice of proposed sale | Oct 6, 2025 | — |
| 144 | Notice of proposed sale | Oct 6, 2025 | — |
| 144 | Notice of proposed sale | Oct 6, 2025 | — |
| 144 | Notice of proposed sale | Oct 3, 2025 | — |
| 144 | Notice of proposed sale | Oct 3, 2025 | — |
| 144 | Notice of proposed sale | Oct 3, 2025 | — |
| 144 | Notice of proposed sale | Oct 3, 2025 | — |
| 144 | Notice of proposed sale | Oct 3, 2025 | — |
Showing 200 filings, the most recent 200. Main filings leave out insider and ownership forms such as Form 4; choose a type above to see them. Each form opens on SEC.gov. Older filings are on SEC EDGAR.
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Company profile
- Industry
- Services-Prepackaged Software (SIC 7372)
- Listed as
- ARQQ (Nasdaq)
- Fiscal year ends
- September 30
- Incorporated in
- Cayman Islands
- Headquarters
- London, United Kingdom
- SEC filer status
- Accelerated filer, Emerging growth company
- SEC CIK
- 1859690
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Source: SEC EDGAR filings. This is company-reported data, not investment advice.