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 |
|---|---|---|---|
| 6-K | Current report (foreign issuer) | Oct 8, 2026 | Oct 8, 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 |
| 6-K | Current report (foreign issuer) | Jun 17, 2026 | Jun 17, 2026 |
| 424B3 | Prospectus | May 21, 2026 | — |
| 6-K | Current report (foreign issuer) | May 21, 2026 | Mar 31, 2026 |
| 6-K | Current report (foreign issuer) | May 1, 2026 | May 1, 2026 |
| 6-K | Current report (foreign issuer) | Apr 13, 2026 | Apr 13, 2026 |
| 6-K | Current report (foreign issuer) | Mar 4, 2026 | Mar 4, 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 |
| 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 |
| 6-K | Current report (foreign issuer) | Oct 21, 2025 | Oct 21, 2025 |
| 6-K | Current report (foreign issuer) | Oct 9, 2025 | Oct 9, 2025 |
| EFFECT | Filing | Sep 19, 2025 | — |
| 424B3 | Prospectus | Sep 19, 2025 | — |
| CORRESP | Letter to the SEC | Sep 17, 2025 | — |
| F-3/A | Filing | Sep 15, 2025 | — |
| 424B5 | Prospectus supplement | Sep 15, 2025 | — |
| 6-K | Current report (foreign issuer) | Sep 15, 2025 | Sep 15, 2025 |
| 6-K | Current report (foreign issuer) | Sep 11, 2025 | Sep 11, 2025 |
| UPLOAD | Letter from the SEC | Sep 9, 2025 | — |
| F-3 | Shelf registration (foreign issuer) | Aug 29, 2025 | — |
| 6-K | Current report (foreign issuer) | Aug 28, 2025 | Aug 28, 2025 |
| 424B3 | Prospectus | May 22, 2025 | — |
| 6-K | Current report (foreign issuer) | May 22, 2025 | Mar 31, 2025 |
| 6-K | Current report (foreign issuer) | Apr 4, 2025 | Apr 4, 2025 |
| S-8 | Employee stock plan registration | Feb 5, 2025 | — |
| EFFECT | Filing | Jan 29, 2025 | — |
| 424B5 | Prospectus supplement | Jan 29, 2025 | — |
| CORRESP | Letter to the SEC | Jan 28, 2025 | — |
| UPLOAD | Letter from the SEC | Jan 27, 2025 | — |
| F-3 | Shelf registration (foreign issuer) | Jan 17, 2025 | — |
| 6-K | Current report (foreign issuer) | Dec 19, 2024 | Dec 19, 2024 |
| 6-K | Current report (foreign issuer) | Dec 9, 2024 | Dec 9, 2024 |
| 20-F | Annual report (foreign issuer) | Dec 5, 2024 | Sep 30, 2024 |
| 6-K | Current report (foreign issuer) | Dec 5, 2024 | Dec 5, 2024 |
| 6-K | Current report (foreign issuer) | Dec 3, 2024 | Dec 3, 2024 |
| 424B3 | Prospectus | Dec 3, 2024 | — |
| 6-K | Current report (foreign issuer) | Oct 11, 2024 | Oct 11, 2024 |
| 424B5 | Prospectus supplement | Oct 1, 2024 | — |
| 6-K | Current report (foreign issuer) | Oct 1, 2024 | Oct 1, 2024 |
| 424B3 | Prospectus | Oct 1, 2024 | — |
| 6-K | Current report (foreign issuer) | Sep 27, 2024 | Sep 27, 2024 |
| 6-K | Current report (foreign issuer) | Sep 19, 2024 | Sep 19, 2024 |
| 6-K | Current report (foreign issuer) | Aug 27, 2024 | Aug 27, 2024 |
| 424B3 | Prospectus | May 20, 2024 | — |
| 6-K | Current report (foreign issuer) | May 20, 2024 | Mar 31, 2024 |
| 424B5 | Prospectus supplement | Apr 15, 2024 | — |
| 6-K | Current report (foreign issuer) | Apr 15, 2024 | Apr 15, 2024 |
| 424B3 | Prospectus | Apr 15, 2024 | — |
| S-8 | Employee stock plan registration | Dec 8, 2023 | — |
| 20-F | Annual report (foreign issuer) | Nov 21, 2023 | Sep 30, 2023 |
| 6-K | Current report (foreign issuer) | Nov 21, 2023 | Nov 21, 2023 |
| 6-K | Current report (foreign issuer) | Oct 23, 2023 | Oct 23, 2023 |
| 424B5 | Prospectus supplement | Sep 11, 2023 | — |
| 6-K | Current report (foreign issuer) | Sep 11, 2023 | Sep 11, 2023 |
| 424B3 | Prospectus | Sep 8, 2023 | — |
| 6-K | Current report (foreign issuer) | Sep 7, 2023 | Sep 7, 2023 |
| 6-K | Current report (foreign issuer) | Sep 7, 2023 | Sep 7, 2023 |
| 6-K | Current report (foreign issuer) | Aug 8, 2023 | Aug 8, 2023 |
| 6-K | Current report (foreign issuer) | Jun 2, 2023 | Jun 2, 2023 |
| 424B3 | Prospectus | May 17, 2023 | — |
| 6-K | Current report (foreign issuer) | May 17, 2023 | May 17, 2023 |
| 424B5 | Prospectus supplement | Feb 21, 2023 | — |
| 6-K | Current report (foreign issuer) | Feb 21, 2023 | Feb 21, 2023 |
| EFFECT | Filing | Dec 30, 2022 | — |
| 424B5 | Prospectus supplement | Dec 30, 2022 | — |
| CORRESP | Letter to the SEC | Dec 28, 2022 | — |
| F-3/A | Filing | Dec 28, 2022 | — |
| UPLOAD | Letter from the SEC | Dec 23, 2022 | — |
| 6-K | Current report (foreign issuer) | Dec 14, 2022 | Dec 14, 2022 |
| F-3 | Shelf registration (foreign issuer) | Dec 14, 2022 | — |
| 20-F | Annual report (foreign issuer) | Dec 14, 2022 | Sep 30, 2022 |
| EFFECT | Filing | Nov 22, 2022 | — |
| 424B3 | Prospectus | Nov 22, 2022 | — |
| POS AM | Filing | Nov 9, 2022 | — |
| 6-K | Current report (foreign issuer) | Sep 8, 2022 | Sep 8, 2022 |
| UPLOAD | Letter from the SEC | Aug 15, 2022 | — |
| 6-K | Current report (foreign issuer) | Aug 8, 2022 | Aug 8, 2022 |
| CORRESP | Letter to the SEC | Jul 11, 2022 | — |
| UPLOAD | Letter from the SEC | Jun 28, 2022 | — |
| CORRESP | Letter to the SEC | Jun 15, 2022 | — |
| UPLOAD | Letter from the SEC | Jun 1, 2022 | — |
| 424B3 | Prospectus | May 12, 2022 | — |
| 6-K | Current report (foreign issuer) | May 12, 2022 | May 12, 2022 |
| S-8 | Employee stock plan registration | Jan 18, 2022 | — |
| EFFECT | Filing | Dec 23, 2021 | — |
| 424B3 | Prospectus | Dec 23, 2021 | — |
| POS AM | Form pos am | Dec 16, 2021 | — |
| 20-F | Annual report (foreign issuer) | Dec 16, 2021 | Sep 30, 2021 |
| 6-K | Current report (foreign issuer) | Dec 16, 2021 | Dec 16, 2021 |
| EFFECT | Filing | Oct 12, 2021 | — |
| 424B3 | Prospectus | Oct 12, 2021 | — |
| CORRESP | Letter to the SEC | Oct 12, 2021 | — |
| F-1/A | Filing | Oct 8, 2021 | — |
| UPLOAD | Letter from the SEC | Oct 6, 2021 | — |
| 6-K | Current report (foreign issuer) | Oct 4, 2021 | Oct 4, 2021 |
| F-1 | Registration statement (foreign issuer) | Oct 1, 2021 | — |
| 20-F | Annual report (foreign issuer) | Sep 10, 2021 | Sep 1, 2021 |
| 6-K | Current report (foreign issuer) | Sep 8, 2021 | Sep 8, 2021 |
| 6-K | Current report (foreign issuer) | Sep 3, 2021 | Sep 3, 2021 |
| CERT | 8a cert | Sep 3, 2021 | — |
| 8-A12B | Form 8-a12b | Sep 1, 2021 | — |
| 425 | Filing | Sep 1, 2021 | — |
| 424B3 | Prospectus | Aug 30, 2021 | — |
| 425 | Filing | Aug 30, 2021 | — |
| 425 | Filing | Aug 27, 2021 | — |
| 425 | Filing | Aug 27, 2021 | — |
| 425 | Filing | Aug 24, 2021 | — |
| 424B3 | Prospectus | Aug 23, 2021 | — |
| 425 | Filing | Aug 19, 2021 | — |
| 425 | Filing | Aug 12, 2021 | — |
| 425 | Filing | Aug 11, 2021 | — |
| 425 | Filing | Aug 11, 2021 | — |
| 425 | Filing | Aug 9, 2021 | — |
| 425 | Filing | Aug 3, 2021 | — |
| 425 | Filing | Aug 3, 2021 | — |
| 425 | Filing | Aug 3, 2021 | — |
| 425 | Filing | Aug 3, 2021 | — |
| EFFECT | Filing | Jul 30, 2021 | — |
| 424B3 | Prospectus | Jul 30, 2021 | — |
| CORRESP | Letter to the SEC | Jul 29, 2021 | — |
| CORRESP | Letter to the SEC | Jul 29, 2021 | — |
| F-4/A | Filing | Jul 29, 2021 | — |
| UPLOAD | Letter from the SEC | Jul 27, 2021 | — |
| 425 | Filing | Jul 27, 2021 | — |
| 425 | Filing | Jul 27, 2021 | — |
| F-4/A | Filing | Jul 26, 2021 | — |
| 425 | Form 425 | Jul 23, 2021 | — |
| 425 | Filing | Jul 19, 2021 | — |
| CORRESP | Letter to the SEC | Jul 9, 2021 | — |
| F-4/A | Filing | Jul 9, 2021 | — |
| UPLOAD | Letter from the SEC | Jun 24, 2021 | — |
| 425 | Filing | Jun 17, 2021 | — |
| F-4 | Filing | May 28, 2021 | — |
| 425 | Filing | May 20, 2021 | — |
| 425 | Filing | May 17, 2021 | — |
| 425 | Filing | May 12, 2021 | — |
| 425 | Filing | May 12, 2021 | — |
| 425 | Filing | May 12, 2021 | — |
Showing 150 filings. 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.