144 0001967201 XXXXXXXX LIVE 0001859690 Arqit Quantum Inc. 001-40777 3 ORCHARD PLACE LONDON X0 SW1H 0BF 44 203 91 70155 Pointon Nicholas Former Officer Common Fidelity Brokerage Services LLC

900 Salem Street Smithfield RI 02917

5202 155910.52 15291767 06/30/2026 NASDAQ Common 09/30/2022 Restricted Stock Vesting Issuer N 11 09/30/2022 Compensation Common 10/03/2022 Restricted Stock Vesting Issuer N 14 10/03/2022 Compensation Common 10/04/2022 Restricted Stock Vesting Issuer N 13 10/04/2022 Compensation Common 10/05/2022 Restricted Stock Vesting Issuer N 14 10/05/2022 Compensation Common 10/06/2022 Restricted Stock Vesting Issuer N 14 10/06/2022 Compensation Common 10/07/2022 Restricted Stock Vesting Issuer N 14 10/07/2022 Compensation Common 01/03/2023 Restricted Stock Vesting Issuer N 12 01/03/2023 Compensation Common 01/04/2023 Restricted Stock Vesting Issuer N 11 01/04/2023 Compensation Common 01/05/2023 Restricted Stock Vesting Issuer N 12 01/05/2023 Compensation Common 01/06/2023 Restricted Stock Vesting Issuer N 13 01/06/2023 Compensation Common 01/09/2023 Restricted Stock Vesting Issuer N 12 01/09/2023 Compensation Common 01/10/2023 Restricted Stock Vesting Issuer N 12 01/10/2023 Compensation Common 01/11/2023 Restricted Stock Vesting Issuer N 12 01/11/2023 Compensation Common 04/01/2023 Restricted Stock Vesting Issuer N 80 04/01/2023 Compensation Common 07/01/2023 Restricted Stock Vesting Issuer N 87 07/01/2023 Compensation Common 09/29/2023 Restricted Stock Vesting Issuer N 45 09/29/2023 Compensation Common 10/02/2023 Restricted Stock Vesting Issuer N 48 10/02/2023 Compensation Common 10/03/2023 Restricted Stock Vesting Issuer N 45 10/03/2023 Compensation Common 01/02/2024 Restricted Stock Vesting Issuer N 42 01/02/2024 Compensation Common 01/03/2024 Restricted Stock Vesting Issuer N 44 01/03/2024 Compensation Common 01/04/2024 Restricted Stock Vesting Issuer N 42 01/04/2024 Compensation Common 04/01/2024 Restricted Stock Vesting Issuer N 123 04/01/2024 Compensation Common 07/01/2024 Restricted Stock Vesting Issuer N 135 07/01/2024 Compensation Common 10/01/2024 Restricted Stock Vesting Issuer N 306 10/01/2024 Compensation Common 01/01/2025 Restricted Stock Vesting Issuer N 163 01/01/2025 Compensation Common 04/01/2025 Restricted Stock Vesting Issuer N 554 04/01/2025 Compensation Common 07/01/2025 Restricted Stock Vesting Issuer N 334 07/01/2025 Compensation Common 10/01/2025 Restricted Stock Vesting Issuer N 1623 10/01/2025 Compensation Common 10/02/2025 Restricted Stock Vesting Issuer N 1367 10/02/2025 Compensation N Nicholas Pointon

3 Orchard Place London X0 SW1H 0BF

Common 04/02/2026 1709 22774.30 Nicholas Pointon

3 Orchard Place London X0 SW1H 0BF

Common 04/20/2026 435 6903.45 Nicholas Pointon

3 Orchard Place London X0 SW1H 0BF

Common 06/17/2026 7681 159369.23 06/30/2026 /s/Wade Moss, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Nicholas Pointon