SEC Filings for Arqit Quantum Inc. (ARQQ)

Last updated: 2026-05-21 13:25 UTC | Total filings: 383

Browse the latest SEC filings and forms submitted by Arqit Quantum Inc. (ARQQ). Access annual reports, quarterly statements, and other official disclosures.

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Form Filing Date Description Link
424B3 May 21, 2026 424B3 View Document
6-K May 21, 2026 FORM 6-K View Document
4 May 20, 2026 PRIMARY DOCUMENT View Document
4 May 19, 2026 OWNERSHIP DOCUMENT View Document
4 May 15, 2026 OWNERSHIP DOCUMENT View Document
4 May 13, 2026 OWNERSHIP DOCUMENT View Document
4 May 12, 2026 OWNERSHIP DOCUMENT View Document
4 May 8, 2026 PRIMARY DOCUMENT View Document
4 May 8, 2026 OWNERSHIP DOCUMENT View Document
4 May 8, 2026 PRIMARY DOCUMENT View Document
4 May 8, 2026 PRIMARY DOCUMENT View Document
4 May 6, 2026 OWNERSHIP DOCUMENT View Document
4 May 4, 2026 OWNERSHIP DOCUMENT View Document
6-K May 1, 2026 FORM 6-K View Document
4 April 30, 2026 OWNERSHIP DOCUMENT View Document
4 April 29, 2026 OWNERSHIP DOCUMENT View Document
4 April 27, 2026 OWNERSHIP DOCUMENT View Document
4 April 23, 2026 OWNERSHIP DOCUMENT View Document
4 April 21, 2026 OWNERSHIP DOCUMENT View Document
144 April 20, 2026 - View Document
4 April 17, 2026 OWNERSHIP DOCUMENT View Document
6-K April 13, 2026 FORM 6-K View Document
4 April 7, 2026 PRIMARY DOCUMENT View Document
144 April 6, 2026 - View Document
4 April 3, 2026 PRIMARY DOCUMENT View Document
4 April 3, 2026 PRIMARY DOCUMENT View Document
4 April 3, 2026 PRIMARY DOCUMENT View Document
4 April 3, 2026 PRIMARY DOCUMENT View Document
4 April 3, 2026 PRIMARY DOCUMENT View Document
4 April 3, 2026 PRIMARY DOCUMENT View Document
4 April 3, 2026 PRIMARY DOCUMENT View Document
4 April 3, 2026 PRIMARY DOCUMENT View Document
144 April 2, 2026 - View Document
144 April 2, 2026 - View Document
144 April 2, 2026 - View Document
144 April 2, 2026 - View Document
144 April 2, 2026 - View Document
3 March 18, 2026 PRIMARY DOCUMENT View Document
3 March 18, 2026 PRIMARY DOCUMENT View Document
3 March 18, 2026 PRIMARY DOCUMENT View Document
3 March 18, 2026 PRIMARY DOCUMENT View Document
3 March 18, 2026 PRIMARY DOCUMENT View Document
3 March 18, 2026 PRIMARY DOCUMENT View Document
3 March 18, 2026 PRIMARY DOCUMENT View Document
3 March 18, 2026 PRIMARY DOCUMENT View Document
3 March 18, 2026 PRIMARY DOCUMENT View Document
3 March 18, 2026 PRIMARY DOCUMENT View Document
3 March 18, 2026 PRIMARY DOCUMENT View Document
144 March 4, 2026 - View Document
6-K March 4, 2026 FORM 6-K View Document
144 Feb. 25, 2026 - View Document
144 Feb. 20, 2026 - View Document
424B5 Jan. 26, 2026 424B5 View Document
EFFECT Jan. 26, 2026 - View Document
F-3/A Jan. 23, 2026 F-3/A View Document
6-K Jan. 12, 2026 FORM 6-K View Document
F-3 Jan. 12, 2026 F-3 View Document
144 Jan. 6, 2026 - View Document
144 Jan. 2, 2026 - View Document
144 Jan. 2, 2026 - View Document
144 Jan. 2, 2026 - View Document
144 Jan. 2, 2026 - View Document
144 Jan. 2, 2026 - View Document
144 Dec. 11, 2025 - View Document
20-F Dec. 9, 2025 20-F View Document
6-K Dec. 9, 2025 FORM 6-K View Document
424B3 Dec. 9, 2025 424B3 View Document
424B3 Dec. 9, 2025 424B3 View Document
SCHEDULE 13D/A Nov. 12, 2025 - View Document
144 Nov. 4, 2025 - View Document
6-K Oct. 21, 2025 FORM 6-K View Document
SCHEDULE 13D/A Oct. 20, 2025 - View Document
144 Oct. 16, 2025 - View Document
144 Oct. 15, 2025 - View Document
144 Oct. 15, 2025 - View Document
144 Oct. 14, 2025 - View Document
144 Oct. 14, 2025 - View Document
6-K Oct. 9, 2025 FORM 6-K View Document
144 Oct. 6, 2025 - View Document
144 Oct. 6, 2025 - View Document
144 Oct. 6, 2025 - View Document
144 Oct. 6, 2025 - View Document
144 Oct. 6, 2025 - View Document
144 Oct. 3, 2025 - View Document
144 Oct. 3, 2025 - View Document
144 Oct. 3, 2025 - View Document
144 Oct. 3, 2025 - View Document
144 Oct. 3, 2025 - View Document
144 Oct. 2, 2025 - View Document
144 Oct. 2, 2025 - View Document
144 Oct. 2, 2025 - View Document
144 Oct. 2, 2025 - View Document
144 Oct. 2, 2025 - View Document
SCHEDULE 13D/A Sept. 24, 2025 - View Document
EFFECT Sept. 19, 2025 - View Document
424B3 Sept. 19, 2025 424B3 View Document
CORRESP Sept. 17, 2025 - View Document
F-3/A Sept. 15, 2025 F-3/A View Document
424B5 Sept. 15, 2025 424B5 View Document
6-K Sept. 15, 2025 FORM 6-K View Document
6-K Sept. 11, 2025 FORM 6-K View Document
UPLOAD Sept. 9, 2025 - View Document
144 Sept. 3, 2025 - View Document
F-3 Aug. 29, 2025 F-3 View Document
6-K Aug. 28, 2025 FORM 6-K View Document
SCHEDULE 13D/A Aug. 26, 2025 - View Document
144 July 21, 2025 - View Document
144 July 18, 2025 - View Document
144 July 18, 2025 - View Document
144 July 7, 2025 - View Document
144 July 7, 2025 - View Document
144 July 7, 2025 - View Document
144 July 7, 2025 - View Document
144 July 2, 2025 - View Document
144 June 25, 2025 - View Document
144 June 23, 2025 - View Document
144 June 23, 2025 - View Document
144 June 23, 2025 - View Document
SCHEDULE 13D/A May 29, 2025 - View Document
6-K May 22, 2025 FORM 6-K View Document
424B3 May 22, 2025 424B3 View Document
6-K April 4, 2025 FORM 6-K View Document
144 April 2, 2025 - View Document
144 April 2, 2025 - View Document
144 April 2, 2025 - View Document
144 April 2, 2025 - View Document
144 April 2, 2025 - View Document
144 March 18, 2025 - View Document
144 Feb. 14, 2025 - View Document
144 Feb. 13, 2025 - View Document
SCHEDULE 13D/A Feb. 10, 2025 - View Document
S-8 Feb. 5, 2025 FORM S-8 View Document
424B5 Jan. 29, 2025 424B5 View Document
EFFECT Jan. 29, 2025 - View Document
144 Jan. 28, 2025 - View Document
CORRESP Jan. 28, 2025 - View Document
UPLOAD Jan. 27, 2025 - View Document
F-3 Jan. 17, 2025 F-3 View Document
144 Jan. 10, 2025 - View Document
144 Jan. 8, 2025 - View Document
144 Jan. 8, 2025 - View Document
144 Jan. 8, 2025 - View Document
144 Jan. 8, 2025 - View Document
6-K Dec. 19, 2024 FORM 6-K View Document
SCHEDULE 13D/A Dec. 18, 2024 - View Document
144 Dec. 16, 2024 - View Document
SC 13D/A Dec. 13, 2024 FORM View Document
SC 13D/A Dec. 10, 2024 FORM View Document
6-K Dec. 9, 2024 FORM 6-K View Document
20-F Dec. 5, 2024 20-F View Document
6-K Dec. 5, 2024 FORM 6-K View Document
424B3 Dec. 3, 2024 424B3 View Document
6-K Dec. 3, 2024 FORM 6-K View Document
SC 13G/A Nov. 14, 2024 SC 13G/A View Document
144 Oct. 15, 2024 - View Document
144 Oct. 15, 2024 - View Document
144 Oct. 15, 2024 - View Document
144 Oct. 15, 2024 - View Document
6-K Oct. 11, 2024 FORM 6-K View Document
SC 13D/A Oct. 2, 2024 SC 13D/A View Document
SC 13D/A Oct. 2, 2024 SC 13D/A View Document
SC 13G Oct. 1, 2024 SC 13G View Document
6-K Oct. 1, 2024 FORM 6-K View Document
424B3 Oct. 1, 2024 424B3 View Document
424B5 Oct. 1, 2024 424B5 View Document
6-K Sept. 27, 2024 FORM 6-K View Document
6-K Sept. 19, 2024 FORM 6-K View Document
SC 13D/A Sept. 16, 2024 SC 13D/A View Document
6-K Aug. 27, 2024 FORM 6-K View Document
144 July 2, 2024 - View Document
144 July 2, 2024 - View Document
144 July 2, 2024 - View Document
144 July 2, 2024 - View Document
144 May 31, 2024 - View Document
144 May 24, 2024 - View Document
424B3 May 20, 2024 424B3 View Document
6-K May 20, 2024 FORM 6-K View Document
144 May 2, 2024 - View Document
144 May 2, 2024 - View Document
424B5 April 15, 2024 424B5 View Document
6-K April 15, 2024 FORM 6-K View Document
424B3 April 15, 2024 424B3 View Document
SC 13D/A April 15, 2024 SC 13D/A View Document
144 April 2, 2024 - View Document
144 April 2, 2024 - View Document
144 April 2, 2024 - View Document
144 April 2, 2024 - View Document
144 April 2, 2024 - View Document
144 April 2, 2024 - View Document
144 March 4, 2024 - View Document
144 March 4, 2024 - View Document
SC 13D/A Feb. 13, 2024 SC 13D/A View Document
144 Feb. 2, 2024 - View Document
144 Feb. 2, 2024 - View Document
144 Feb. 2, 2024 - View Document
SC 13G Jan. 26, 2024 SC 13G View Document
144 Jan. 22, 2024 - View Document
144 Jan. 18, 2024 - View Document
144 Jan. 5, 2024 - View Document
144 Jan. 5, 2024 - View Document
144 Jan. 5, 2024 - View Document
144 Jan. 5, 2024 - View Document
144 Jan. 5, 2024 - View Document
144 Jan. 4, 2024 - View Document
144 Jan. 4, 2024 - View Document
144 Jan. 4, 2024 - View Document
144 Jan. 4, 2024 - View Document
144 Jan. 4, 2024 - View Document
144 Jan. 3, 2024 - View Document
144 Jan. 3, 2024 - View Document
144 Jan. 3, 2024 - View Document
144 Jan. 3, 2024 - View Document
144 Jan. 3, 2024 - View Document
144 Dec. 26, 2023 - View Document
144 Dec. 21, 2023 - View Document
144 Dec. 19, 2023 - View Document
144 Dec. 18, 2023 - View Document
144 Dec. 15, 2023 - View Document
144 Dec. 14, 2023 - View Document
S-8 Dec. 8, 2023 - View Document
144 Dec. 5, 2023 - View Document
144 Dec. 5, 2023 - View Document
20-F Nov. 21, 2023 20-F View Document
6-K Nov. 21, 2023 FORM 6-K View Document
144 Nov. 2, 2023 - View Document
144 Nov. 2, 2023 - View Document
144 Nov. 2, 2023 - View Document
144 Nov. 2, 2023 - View Document
6-K Oct. 23, 2023 - View Document
144 Oct. 12, 2023 - View Document
144 Oct. 4, 2023 - View Document
144 Oct. 4, 2023 - View Document
144 Oct. 4, 2023 - View Document
144 Oct. 4, 2023 - View Document
144 Oct. 4, 2023 - View Document
144 Oct. 4, 2023 - View Document
144 Oct. 4, 2023 - View Document
144 Oct. 4, 2023 - View Document
144 Oct. 4, 2023 - View Document
144 Oct. 4, 2023 - View Document
144 Oct. 3, 2023 - View Document
144 Oct. 3, 2023 - View Document
144 Oct. 3, 2023 - View Document
144 Oct. 3, 2023 - View Document
144 Oct. 3, 2023 - View Document
144 Oct. 3, 2023 - View Document
144 Oct. 3, 2023 - View Document
144 Oct. 3, 2023 - View Document
144 Oct. 3, 2023 - View Document
144 Oct. 2, 2023 - View Document
144 Oct. 2, 2023 - View Document
144 Oct. 2, 2023 - View Document
144 Oct. 2, 2023 - View Document
144 Oct. 2, 2023 - View Document
144 Oct. 2, 2023 - View Document
144 Oct. 2, 2023 - View Document
144 Oct. 2, 2023 - View Document
144 Oct. 2, 2023 - View Document
SC 13D/A Sept. 15, 2023 SC 13D/A View Document
6-K Sept. 11, 2023 FORM 6-K View Document
424B5 Sept. 11, 2023 424B5 View Document
424B3 Sept. 8, 2023 424B3 View Document
144 Sept. 7, 2023 - View Document
144 Sept. 7, 2023 - View Document
144 Sept. 7, 2023 - View Document
144 Sept. 7, 2023 - View Document
6-K Sept. 7, 2023 FORM 6-K View Document
6-K Sept. 7, 2023 FORM 6-K View Document
6-K Aug. 8, 2023 FORM 6-K View Document
144/A Aug. 3, 2023 - View Document
144 Aug. 2, 2023 - View Document
144 Aug. 2, 2023 - View Document
144 Aug. 2, 2023 - View Document
144 Aug. 2, 2023 - View Document
144 July 6, 2023 - View Document
144 July 6, 2023 - View Document
144 July 3, 2023 - View Document
144 July 3, 2023 - View Document
144 July 3, 2023 - View Document
144 July 3, 2023 - View Document
144 July 3, 2023 - View Document
144 July 3, 2023 - View Document
144 July 3, 2023 - View Document
144 July 3, 2023 - View Document
144 July 3, 2023 - View Document
144 July 3, 2023 - View Document
144 July 3, 2023 - View Document
144 July 3, 2023 - View Document
144 June 15, 2023 - View Document
144 June 14, 2023 - View Document
144 June 14, 2023 - View Document
144 June 14, 2023 - View Document
6-K June 2, 2023 FORM 6-K View Document
6-K May 17, 2023 FORM 6-K View Document
424B3 May 17, 2023 424B3 View Document
144 May 9, 2023 - View Document
144 April 3, 2023 - View Document
424B5 Feb. 21, 2023 424B5 View Document
6-K Feb. 21, 2023 FORM 6-K View Document
SC 13D/A Feb. 3, 2023 SC 13D/A View Document
SC 13G Jan. 6, 2023 SC 13G View Document
EFFECT Dec. 30, 2022 - View Document
424B5 Dec. 30, 2022 424B5 View Document
F-3/A Dec. 28, 2022 F-3/A View Document
CORRESP Dec. 28, 2022 - View Document
UPLOAD Dec. 23, 2022 - View Document
F-3 Dec. 14, 2022 F-3 View Document
20-F Dec. 14, 2022 20-F View Document
6-K Dec. 14, 2022 FORM 6-K View Document
424B3 Nov. 22, 2022 424B3 View Document
EFFECT Nov. 22, 2022 - View Document
POS AM Nov. 9, 2022 POS AM View Document
6-K Sept. 8, 2022 FORM 6-K View Document
UPLOAD Aug. 15, 2022 - View Document
6-K Aug. 8, 2022 FORM 6-K View Document
CORRESP July 11, 2022 - View Document
UPLOAD June 28, 2022 - View Document
CORRESP June 15, 2022 - View Document
UPLOAD June 1, 2022 - View Document
6-K May 12, 2022 FORM 6-K View Document
424B3 May 12, 2022 424B3 View Document
S-8 Jan. 18, 2022 S-8 View Document
SC 13G Jan. 6, 2022 SC 13G View Document
EFFECT Dec. 23, 2021 - View Document
424B3 Dec. 23, 2021 424B3 View Document
20-F Dec. 16, 2021 FORM 20-F View Document
6-K Dec. 16, 2021 FORM 6-K View Document
POS AM Dec. 16, 2021 FORM POS AM View Document
SC 13D/A Dec. 9, 2021 SC 13D/A View Document
CORRESP Oct. 12, 2021 - View Document
EFFECT Oct. 12, 2021 - View Document
424B3 Oct. 12, 2021 424B3 View Document
SC 13D/A Oct. 12, 2021 SC 13D/A View Document
F-1/A Oct. 8, 2021 F-1/A View Document
UPLOAD Oct. 6, 2021 - View Document
6-K Oct. 4, 2021 FORM 6-K View Document
F-1 Oct. 1, 2021 FORM F-1 View Document
SC 13D Sept. 21, 2021 SCHEDULE 13D View Document
SC 13D Sept. 17, 2021 SCHEDULE 13D View Document
SC 13D Sept. 14, 2021 SC 13D View Document
SC 13D Sept. 13, 2021 SC 13D View Document
20-F Sept. 10, 2021 FORM 20-F View Document
6-K Sept. 8, 2021 FORM 6-K View Document
6-K Sept. 3, 2021 FORM 6-K View Document
CERT Sept. 3, 2021 8A CERT View Document
8-A12B Sept. 1, 2021 FORM 8-A12B View Document
425 Sept. 1, 2021 425 View Document
425 Aug. 30, 2021 425 View Document
424B3 Aug. 30, 2021 424B3 View Document
425 Aug. 27, 2021 425 View Document
425 Aug. 27, 2021 425 View Document
425 Aug. 24, 2021 425 View Document
424B3 Aug. 23, 2021 424B3 View Document
425 Aug. 19, 2021 425 View Document
425 Aug. 12, 2021 425 View Document
425 Aug. 11, 2021 425 View Document
425 Aug. 11, 2021 425 View Document
425 Aug. 9, 2021 425 View Document
425 Aug. 3, 2021 425 View Document
425 Aug. 3, 2021 425 View Document
425 Aug. 3, 2021 425 View Document
425 Aug. 3, 2021 425 View Document
424B3 July 30, 2021 424B3 View Document
EFFECT July 30, 2021 - View Document
CORRESP July 29, 2021 - View Document
CORRESP July 29, 2021 - View Document
F-4/A July 29, 2021 F-4/A View Document
UPLOAD July 27, 2021 - View Document
425 July 27, 2021 425 View Document
425 July 27, 2021 425 View Document
F-4/A July 26, 2021 F-4/A View Document
425 July 23, 2021 FORM 425 View Document
425 July 19, 2021 425 View Document
F-4/A July 9, 2021 F-4/A View Document
CORRESP July 9, 2021 - View Document
UPLOAD June 24, 2021 - View Document
425 June 17, 2021 425 View Document
F-4 May 28, 2021 F-4 View Document
425 May 20, 2021 425 View Document
425 May 17, 2021 425 View Document
425 May 12, 2021 425 View Document
425 May 12, 2021 425 View Document
425 May 12, 2021 425 View Document