Arqit Quantum Inc.

Symbol
ARQQ, ARQQW on Nasdaq
Industry
Services Prepackaged Software (Office Of Technology)
Business address
3 Orchard Place, London, United Kingdom, SW1H 0BF
State of incorporation
Cayman Islands
Fiscal year end
30 September
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Arqit Quantum Inc. has filed 320 SEC EDGAR filings since 12 May 2021

Latest Filings

Form type Document Filing Description Filing date Reporting date File number(s)
144 Open Document Open Filing 11 Dec 2025 001-40777
424B3 Open Document Open Filing 424B3 09 Dec 2025 333-259982
424B3 Open Document Open Filing 424B3 09 Dec 2025 333-289939
6-K Open Document Open Filing FORM 6-K 09 Dec 2025 09 Dec 2025 001-40777
20-F Open Document | Data Open Filing 20-F 09 Dec 2025 30 Sep 2025 001-40777
SCHEDULE 13D/A Open Document Open Filing 12 Nov 2025 005-92850
144 Open Document Open Filing 04 Nov 2025 001-40777
6-K Open Document Open Filing FORM 6-K 21 Oct 2025 21 Oct 2025 001-40777
SCHEDULE 13D/A Open Document Open Filing 20 Oct 2025 005-92850
144 Open Document Open Filing 16 Oct 2025 001-40777
144 Open Document Open Filing 15 Oct 2025 001-40777
144 Open Document Open Filing 15 Oct 2025 001-40777
144 Open Document Open Filing 14 Oct 2025 001-40777
144 Open Document Open Filing 14 Oct 2025 001-40777
6-K Open Document Open Filing FORM 6-K 09 Oct 2025 09 Oct 2025 001-40777
144 Open Document Open Filing 06 Oct 2025 001-40777
144 Open Document Open Filing 06 Oct 2025 001-40777
144 Open Document Open Filing 06 Oct 2025 001-40777
144 Open Document Open Filing 06 Oct 2025 001-40777
144 Open Document Open Filing 06 Oct 2025 001-40777
144 Open Document Open Filing 03 Oct 2025 001-40777
144 Open Document Open Filing 03 Oct 2025 001-40777
144 Open Document Open Filing 03 Oct 2025 001-40777
144 Open Document Open Filing 03 Oct 2025 001-40777
144 Open Document Open Filing 03 Oct 2025 001-40777
144 Open Document Open Filing 02 Oct 2025 001-40777
144 Open Document Open Filing 02 Oct 2025 001-40777
144 Open Document Open Filing 02 Oct 2025 001-40777
144 Open Document Open Filing 02 Oct 2025 001-40777
144 Open Document Open Filing 02 Oct 2025 001-40777
SCHEDULE 13D/A Open Document Open Filing 24 Sep 2025 005-92850
EFFECT Open Document Open Filing 19 Sep 2025 333-289939
424B3 Open Document Open Filing 424B3 19 Sep 2025 333-289939
CORRESP Open Document Open Filing 17 Sep 2025
F-3/A Open Document Open Filing F-3/A 15 Sep 2025 333-289939
424B5 Open Document Open Filing 424B5 15 Sep 2025 333-284343
6-K Open Document Open Filing FORM 6-K 15 Sep 2025 15 Sep 2025 001-40777
6-K Open Document Open Filing FORM 6-K 11 Sep 2025 11 Sep 2025 001-40777
UPLOAD Open Document Open Filing 09 Sep 2025 333-289939
144 Open Document Open Filing 03 Sep 2025 001-40777
F-3 Open Document | Data Open Filing F-3 29 Aug 2025 333-289939
6-K Open Document Open Filing FORM 6-K 28 Aug 2025 28 Aug 2025 001-40777
SCHEDULE 13D/A Open Document Open Filing 26 Aug 2025 005-92850
144 Open Document Open Filing 21 Jul 2025 001-40777
144 Open Document Open Filing 18 Jul 2025 001-40777
144 Open Document Open Filing 18 Jul 2025 001-40777
144 Open Document Open Filing 07 Jul 2025 001-40777
144 Open Document Open Filing 07 Jul 2025 001-40777
144 Open Document Open Filing 07 Jul 2025 001-40777
144 Open Document Open Filing 07 Jul 2025 001-40777
144 Open Document Open Filing 02 Jul 2025 001-40777
144 Open Document Open Filing 25 Jun 2025 001-40777
144 Open Document Open Filing 23 Jun 2025 001-40777
144 Open Document Open Filing 23 Jun 2025 001-40777
144 Open Document Open Filing 23 Jun 2025 001-40777
SCHEDULE 13D/A Open Document Open Filing 29 May 2025 005-92850
424B3 Open Document Open Filing 424B3 22 May 2025 333-259982
6-K Open Document | Data Open Filing FORM 6-K 22 May 2025 31 Mar 2025 001-40777
6-K Open Document Open Filing FORM 6-K 04 Apr 2025 04 Apr 2025 001-40777
144 Open Document Open Filing 02 Apr 2025 001-40777
144 Open Document Open Filing 02 Apr 2025 001-40777
144 Open Document Open Filing 02 Apr 2025 001-40777
144 Open Document Open Filing 02 Apr 2025 001-40777
144 Open Document Open Filing 02 Apr 2025 001-40777
144 Open Document Open Filing 18 Mar 2025 001-40777
144 Open Document Open Filing 14 Feb 2025 001-40777
144 Open Document Open Filing 13 Feb 2025 001-40777
SCHEDULE 13D/A Open Document Open Filing 10 Feb 2025 005-92850
S-8 Open Document Open Filing FORM S-8 05 Feb 2025 333-284706
EFFECT Open Document Open Filing 29 Jan 2025 333-284343
424B5 Open Document Open Filing 424B5 29 Jan 2025 333-284343
144 Open Document Open Filing 28 Jan 2025 001-40777
CORRESP Open Document Open Filing 28 Jan 2025
UPLOAD Open Document Open Filing 27 Jan 2025 333-284343
F-3 Open Document Open Filing F-3 17 Jan 2025 333-284343
144 Open Document Open Filing 10 Jan 2025 001-40777
144 Open Document Open Filing 08 Jan 2025 001-40777
144 Open Document Open Filing 08 Jan 2025 001-40777
144 Open Document Open Filing 08 Jan 2025 001-40777
144 Open Document Open Filing 08 Jan 2025 001-40777
6-K Open Document Open Filing FORM 6-K 19 Dec 2024 19 Dec 2024 001-40777
SCHEDULE 13D/A Open Document Open Filing 18 Dec 2024 005-92850
144 Open Document Open Filing 16 Dec 2024 001-40777
SC 13D/A Open Document Open Filing FORM 13 Dec 2024 005-92850
SC 13D/A Open Document Open Filing FORM 10 Dec 2024 005-92850
6-K Open Document Open Filing FORM 6-K 09 Dec 2024 09 Dec 2024 001-40777
20-F Open Document | Data Open Filing 20-F 05 Dec 2024 30 Sep 2024 001-40777
6-K Open Document Open Filing FORM 6-K 05 Dec 2024 05 Dec 2024 001-40777
6-K Open Document Open Filing FORM 6-K 03 Dec 2024 03 Dec 2024 001-40777
424B3 Open Document Open Filing 424B3 03 Dec 2024 333-259982
SC 13G/A Open Document Open Filing SC 13G/A 14 Nov 2024 005-92850
144 Open Document Open Filing 15 Oct 2024 001-40777
144 Open Document Open Filing 15 Oct 2024 001-40777
144 Open Document Open Filing 15 Oct 2024 001-40777
144 Open Document Open Filing 15 Oct 2024 001-40777
6-K Open Document Open Filing FORM 6-K 11 Oct 2024 11 Oct 2024 001-40777
SC 13D/A Open Document Open Filing SC 13D/A 02 Oct 2024 005-92850
SC 13D/A Open Document Open Filing SC 13D/A 02 Oct 2024 005-92850
SC 13G Open Document Open Filing SC 13G 01 Oct 2024 005-92850
424B5 Open Document Open Filing 424B5 01 Oct 2024 333-268786
6-K Open Document Open Filing FORM 6-K 01 Oct 2024 01 Oct 2024 001-40777
424B3 Open Document Open Filing 424B3 01 Oct 2024 333-268786
6-K Open Document Open Filing FORM 6-K 27 Sep 2024 27 Sep 2024 001-40777
6-K Open Document Open Filing FORM 6-K 19 Sep 2024 19 Sep 2024 001-40777
SC 13D/A Open Document Open Filing SC 13D/A 16 Sep 2024 005-92850
6-K Open Document Open Filing FORM 6-K 27 Aug 2024 27 Aug 2024 001-40777
144 Open Document Open Filing 02 Jul 2024 001-40777
144 Open Document Open Filing 02 Jul 2024 001-40777
144 Open Document Open Filing 02 Jul 2024 001-40777
144 Open Document Open Filing 02 Jul 2024 001-40777
144 Open Document Open Filing 31 May 2024 001-40777
144 Open Document Open Filing 24 May 2024 001-40777
424B3 Open Document Open Filing 424B3 20 May 2024 333-259982
6-K Open Document | Data Open Filing FORM 6-K 20 May 2024 31 Mar 2024 001-40777
144 Open Document Open Filing 02 May 2024 001-40777
144 Open Document Open Filing 02 May 2024 001-40777
SC 13D/A Open Document Open Filing SC 13D/A 15 Apr 2024 005-92850
424B5 Open Document Open Filing 424B5 15 Apr 2024 333-268786
6-K Open Document Open Filing FORM 6-K 15 Apr 2024 15 Apr 2024 001-40777
424B3 Open Document Open Filing 424B3 15 Apr 2024 333-268786
144 Open Document Open Filing 02 Apr 2024 001-40777
144 Open Document Open Filing 02 Apr 2024 001-40777
144 Open Document Open Filing 02 Apr 2024 001-40777
144 Open Document Open Filing 02 Apr 2024 001-40777
144 Open Document Open Filing 02 Apr 2024 001-40777
144 Open Document Open Filing 02 Apr 2024 001-40777
144 Open Document Open Filing 04 Mar 2024 001-40777
144 Open Document Open Filing 04 Mar 2024 001-40777
SC 13D/A Open Document Open Filing SC 13D/A 13 Feb 2024 005-92850
144 Open Document Open Filing 02 Feb 2024 001-40777
144 Open Document Open Filing 02 Feb 2024 001-40777
144 Open Document Open Filing 02 Feb 2024 001-40777
SC 13G Open Document Open Filing SC 13G 26 Jan 2024 005-92850
144 Open Document Open Filing 22 Jan 2024 001-40777
144 Open Document Open Filing 18 Jan 2024 001-40777
144 Open Document Open Filing 05 Jan 2024 001-40777
144 Open Document Open Filing 05 Jan 2024 001-40777
144 Open Document Open Filing 05 Jan 2024 001-40777
144 Open Document Open Filing 05 Jan 2024 001-40777
144 Open Document Open Filing 05 Jan 2024 001-40777
144 Open Document Open Filing 04 Jan 2024 001-40777
144 Open Document Open Filing 04 Jan 2024 001-40777
144 Open Document Open Filing 04 Jan 2024 001-40777
144 Open Document Open Filing 04 Jan 2024 001-40777
144 Open Document Open Filing 04 Jan 2024 001-40777
144 Open Document Open Filing 03 Jan 2024 001-40777
144 Open Document Open Filing 03 Jan 2024 001-40777
144 Open Document Open Filing 03 Jan 2024 001-40777
144 Open Document Open Filing 03 Jan 2024 001-40777
144 Open Document Open Filing 03 Jan 2024 001-40777
144 Open Document Open Filing 26 Dec 2023 001-40777
144 Open Document Open Filing 21 Dec 2023 001-40777
144 Open Document Open Filing 19 Dec 2023 001-40777
144 Open Document Open Filing 18 Dec 2023 001-40777
144 Open Document Open Filing 15 Dec 2023 001-40777
144 Open Document Open Filing 14 Dec 2023 001-40777
S-8 Open Document Open Filing 08 Dec 2023 333-275960
144 Open Document Open Filing 05 Dec 2023 001-40777
144 Open Document Open Filing 05 Dec 2023 001-40777
20-F Open Document | Data Open Filing 20-F 21 Nov 2023 30 Sep 2023 001-40777
6-K Open Document Open Filing FORM 6-K 21 Nov 2023 21 Nov 2023 001-40777
144 Open Document Open Filing 02 Nov 2023 001-40777
144 Open Document Open Filing 02 Nov 2023 001-40777
144 Open Document Open Filing 02 Nov 2023 001-40777
144 Open Document Open Filing 02 Nov 2023 001-40777
6-K Open Document Open Filing 23 Oct 2023 23 Oct 2023 001-40777
144 Open Document Open Filing 12 Oct 2023 001-40777
144 Open Document Open Filing 04 Oct 2023 001-40777
144 Open Document Open Filing 04 Oct 2023 001-40777
144 Open Document Open Filing 04 Oct 2023 001-40777
144 Open Document Open Filing 04 Oct 2023 001-40777
144 Open Document Open Filing 04 Oct 2023 001-40777
144 Open Document Open Filing 04 Oct 2023 001-40777
144 Open Document Open Filing 04 Oct 2023 001-40777
144 Open Document Open Filing 04 Oct 2023 001-40777
144 Open Document Open Filing 04 Oct 2023 001-40777
144 Open Document Open Filing 04 Oct 2023 001-40777
144 Open Document Open Filing 03 Oct 2023 001-40777
144 Open Document Open Filing 03 Oct 2023 001-40777
144 Open Document Open Filing 03 Oct 2023 001-40777
144 Open Document Open Filing 03 Oct 2023 001-40777
144 Open Document Open Filing 03 Oct 2023 001-40777
144 Open Document Open Filing 03 Oct 2023 001-40777
144 Open Document Open Filing 03 Oct 2023 001-40777
144 Open Document Open Filing 03 Oct 2023 001-40777
144 Open Document Open Filing 03 Oct 2023 001-40777
144 Open Document Open Filing 02 Oct 2023 001-40777
144 Open Document Open Filing 02 Oct 2023 001-40777
144 Open Document Open Filing 02 Oct 2023 001-40777
144 Open Document Open Filing 02 Oct 2023 001-40777
144 Open Document Open Filing 02 Oct 2023 001-40777
144 Open Document Open Filing 02 Oct 2023 001-40777
144 Open Document Open Filing 02 Oct 2023 001-40777
144 Open Document Open Filing 02 Oct 2023 001-40777
144 Open Document Open Filing 02 Oct 2023 001-40777
SC 13D/A Open Document Open Filing SC 13D/A 15 Sep 2023 005-92850
424B5 Open Document Open Filing 424B5 11 Sep 2023 333-268786
6-K Open Document Open Filing FORM 6-K 11 Sep 2023 11 Sep 2023 001-40777
424B3 Open Document Open Filing 424B3 08 Sep 2023 333-268786
6-K Open Document Open Filing FORM 6-K 07 Sep 2023 07 Sep 2023 001-40777
144 Open Document Open Filing 07 Sep 2023 001-40777
144 Open Document Open Filing 07 Sep 2023 001-40777
144 Open Document Open Filing 07 Sep 2023 001-40777
144 Open Document Open Filing 07 Sep 2023 001-40777
6-K Open Document Open Filing FORM 6-K 07 Sep 2023 07 Sep 2023 001-40777
6-K Open Document Open Filing FORM 6-K 08 Aug 2023 08 Aug 2023 001-40777
144/A Open Document Open Filing 03 Aug 2023 001-40777
144 Open Document Open Filing 02 Aug 2023 001-40777
144 Open Document Open Filing 02 Aug 2023 001-40777
144 Open Document Open Filing 02 Aug 2023 001-40777
144 Open Document Open Filing 02 Aug 2023 001-40777
144 Open Document Open Filing 06 Jul 2023 001-40777
144 Open Document Open Filing 06 Jul 2023 001-40777
144 Open Document Open Filing 03 Jul 2023 001-40777
144 Open Document Open Filing 03 Jul 2023 001-40777
144 Open Document Open Filing 03 Jul 2023 001-40777
144 Open Document Open Filing 03 Jul 2023 001-40777
144 Open Document Open Filing 03 Jul 2023 001-40777
144 Open Document Open Filing 03 Jul 2023 001-40777
144 Open Document Open Filing 03 Jul 2023 001-40777
144 Open Document Open Filing 03 Jul 2023 001-40777
144 Open Document Open Filing 03 Jul 2023 001-40777
144 Open Document Open Filing 03 Jul 2023 001-40777
144 Open Document Open Filing 03 Jul 2023 001-40777
144 Open Document Open Filing 03 Jul 2023 001-40777
144 Open Document Open Filing 15 Jun 2023 001-40777
144 Open Document Open Filing 14 Jun 2023 001-40777
144 Open Document Open Filing 14 Jun 2023 001-40777
144 Open Document Open Filing 14 Jun 2023 001-40777
6-K Open Document Open Filing FORM 6-K 02 Jun 2023 02 Jun 2023 001-40777
424B3 Open Document Open Filing 424B3 17 May 2023 333-259982
6-K Open Document Open Filing FORM 6-K 17 May 2023 17 May 2023 001-40777
144 Open Document Open Filing 09 May 2023 001-40777
144 Open Document Open Filing 03 Apr 2023 001-40777
424B5 Open Document Open Filing 424B5 21 Feb 2023 333-268786
6-K Open Document Open Filing FORM 6-K 21 Feb 2023 21 Feb 2023 001-40777
SC 13D/A Open Document Open Filing SC 13D/A 03 Feb 2023 005-92850
SC 13G Open Document Open Filing SC 13G 06 Jan 2023 005-92850
EFFECT Open Document Open Filing 30 Dec 2022 333-268786
424B5 Open Document Open Filing 424B5 30 Dec 2022 333-268786
CORRESP Open Document Open Filing 28 Dec 2022
F-3/A Open Document Open Filing F-3/A 28 Dec 2022 333-268786
UPLOAD Open Document Open Filing 23 Dec 2022
6-K Open Document Open Filing FORM 6-K 14 Dec 2022 14 Dec 2022 001-40777
F-3 Open Document Open Filing F-3 14 Dec 2022 333-268786
20-F Open Document | Data Open Filing 20-F 14 Dec 2022 30 Sep 2022 001-40777
EFFECT Open Document Open Filing 22 Nov 2022 333-259982
424B3 Open Document Open Filing 424B3 22 Nov 2022 333-259982
POS AM Open Document Open Filing POS AM 09 Nov 2022 333-259982
6-K Open Document Open Filing FORM 6-K 08 Sep 2022 08 Sep 2022 001-40777
UPLOAD Open Document Open Filing 15 Aug 2022
6-K Open Document Open Filing FORM 6-K 08 Aug 2022 08 Aug 2022 001-40777
CORRESP Open Document Open Filing 11 Jul 2022
UPLOAD Open Document Open Filing 28 Jun 2022
CORRESP Open Document Open Filing 15 Jun 2022
UPLOAD Open Document Open Filing 01 Jun 2022
424B3 Open Document Open Filing 424B3 12 May 2022 333-259982
6-K Open Document Open Filing FORM 6-K 12 May 2022 12 May 2022 001-40777
S-8 Open Document Open Filing S-8 18 Jan 2022 333-262215
SC 13G Open Document Open Filing SC 13G 06 Jan 2022 005-92850
EFFECT Open Document Open Filing 23 Dec 2021 333-259982
424B3 Open Document Open Filing 424B3 23 Dec 2021 333-259982
POS AM Open Document | Data Open Filing FORM POS AM 16 Dec 2021 333-259982
20-F Open Document | Data Open Filing FORM 20-F 16 Dec 2021 30 Sep 2021 001-40777
6-K Open Document Open Filing FORM 6-K 16 Dec 2021 16 Dec 2021 001-40777
SC 13D/A Open Document Open Filing SC 13D/A 09 Dec 2021 005-92850
EFFECT Open Document Open Filing 12 Oct 2021 333-259982
424B3 Open Document Open Filing 424B3 12 Oct 2021 333-259982
SC 13D/A Open Document Open Filing SC 13D/A 12 Oct 2021 005-92850
CORRESP Open Document Open Filing 12 Oct 2021
F-1/A Open Document Open Filing F-1/A 08 Oct 2021 333-259982
UPLOAD Open Document Open Filing 06 Oct 2021
6-K Open Document Open Filing FORM 6-K 04 Oct 2021 04 Oct 2021 001-40777
F-1 Open Document | Data Open Filing FORM F-1 01 Oct 2021 333-259982
SC 13D Open Document Open Filing SCHEDULE 13D 21 Sep 2021 005-92850
SC 13D Open Document Open Filing SCHEDULE 13D 17 Sep 2021 005-92850
SC 13D Open Document Open Filing SC 13D 14 Sep 2021 005-92850
SC 13D Open Document Open Filing SC 13D 13 Sep 2021 005-92850
20-F Open Document Open Filing FORM 20-F 10 Sep 2021 01 Sep 2021 001-40777
6-K Open Document Open Filing FORM 6-K 08 Sep 2021 08 Sep 2021 001-40777
6-K Open Document Open Filing FORM 6-K 03 Sep 2021 03 Sep 2021 001-40777
CERT Open Document Open Filing 8A CERT 03 Sep 2021 001-40777
8-A12B Open Document Open Filing FORM 8-A12B 01 Sep 2021 001-40777
425 Open Document Open Filing 425 01 Sep 2021 333-256591
424B3 Open Document Open Filing 424B3 30 Aug 2021 333-256591
425 Open Document Open Filing 425 30 Aug 2021 333-256591
425 Open Document Open Filing 425 27 Aug 2021
425 Open Document Open Filing 425 27 Aug 2021 333-256591
425 Open Document Open Filing 425 24 Aug 2021
424B3 Open Document Open Filing 424B3 23 Aug 2021 333-256591
425 Open Document Open Filing 425 19 Aug 2021
425 Open Document Open Filing 425 12 Aug 2021
425 Open Document Open Filing 425 11 Aug 2021
425 Open Document Open Filing 425 11 Aug 2021
425 Open Document Open Filing 425 09 Aug 2021
425 Open Document Open Filing 425 03 Aug 2021
425 Open Document Open Filing 425 03 Aug 2021
425 Open Document Open Filing 425 03 Aug 2021
425 Open Document Open Filing 425 03 Aug 2021
EFFECT Open Document Open Filing 30 Jul 2021 333-256591
424B3 Open Document Open Filing 424B3 30 Jul 2021 333-256591
CORRESP Open Document Open Filing 29 Jul 2021
CORRESP Open Document Open Filing 29 Jul 2021
F-4/A Open Document Open Filing F-4/A 29 Jul 2021 333-256591
UPLOAD Open Document Open Filing 27 Jul 2021
425 Open Document Open Filing 425 27 Jul 2021
425 Open Document Open Filing 425 27 Jul 2021
F-4/A Open Document Open Filing F-4/A 26 Jul 2021 333-256591
425 Open Document Open Filing FORM 425 23 Jul 2021
425 Open Document Open Filing 425 19 Jul 2021
CORRESP Open Document Open Filing 09 Jul 2021
F-4/A Open Document Open Filing F-4/A 09 Jul 2021 333-256591
UPLOAD Open Document Open Filing 24 Jun 2021
425 Open Document Open Filing 425 17 Jun 2021
F-4 Open Document Open Filing F-4 28 May 2021 333-256591
425 Open Document Open Filing 425 20 May 2021
425 Open Document Open Filing 425 17 May 2021
425 Open Document Open Filing 425 12 May 2021
425 Open Document Open Filing 425 12 May 2021
425 Open Document Open Filing 425 12 May 2021