144 0001967211 XXXXXXXX LIVE 0001859690 Arqit Quantum Inc. 001-40777 NOVA NORTH 7 FLOOR, 11 BRESSENDEN PLACE LONDON X0 SW1E 5BY 44 203 91 70155 Willcocks Patrick Officer Common Fidelity Brokerage Services LLC

900 Salem Street Smithfield RI 02917

20000 10272.40 163554269 12/14/2023 NASDAQ Common 09/30/2022 Restricted Stock Vesting Issuer N 311 09/30/2022 Compensation Common 10/03/2022 Restricted Stock Vesting Issuer N 401 10/03/2022 Compensation Common 10/04/2022 Restricted Stock Vesting Issuer N 359 10/04/2022 Compensation Common 10/05/2022 Restricted Stock Vesting Issuer N 384 10/05/2022 Compensation Common 10/06/2022 Restricted Stock Vesting Issuer N 382 10/06/2022 Compensation Common 10/07/2022 Restricted Stock Vesting Issuer N 379 10/07/2022 Compensation Common 01/03/2023 Restricted Stock Vesting Issuer N 341 01/03/2023 Compensation Common 01/04/2023 Restricted Stock Vesting Issuer N 319 01/04/2023 Compensation Common 01/05/2023 Restricted Stock Vesting Issuer N 345 01/05/2023 Compensation Common 01/06/2023 Restricted Stock Vesting Issuer N 354 01/06/2023 Compensation Common 01/09/2023 Restricted Stock Vesting Issuer N 321 01/09/2023 Compensation Common 01/10/2023 Restricted Stock Vesting Issuer N 333 01/10/2023 Compensation Common 01/11/2023 Restricted Stock Vesting Issuer N 344 01/11/2023 Compensation Common 04/01/2023 Restricted Stock Vesting Issuer N 2212 04/01/2023 Compensation Common 05/09/2023 Stock Option Exercise Issuer N 13215 05/09/2023 Cash N Patrick Willcocks

11 Bressenden Place Nova North, 7 Floor London X0 SW1E 5BY

Common 11/02/2023 2540 1128.01 Patrick Willcocks

11 Bressenden Place Nova North, 7 Floor London X0 SW1E 5BY

Common 10/04/2023 2132 1193.92 Patrick Willcocks

11 Bressenden Place Nova North, 7 Floor London X0 SW1E 5BY

Common 10/03/2023 1990 1159.37 Patrick Willcocks

11 Bressenden Place Nova North, 7 Floor London X0 SW1E 5BY

Common 10/02/2023 2089 1236.06 12/14/2023 /S/ Adam Gehring, as a duly authorized representative of Fidelity Brokerage Services LLC, as attorney-in-fact for Patrick Willcocks