X0607 3 2026-03-18 0 0001859690 Arqit Quantum Inc. ARQQ 0002035890 Leaver Andrew C/O ARQIT INC. 1209 ORANGE STREET WILMINGTON DE 19801 1 Chief Executive Officer Ordinary Shares 37721 D Restricted Stock Units Ordinary Shares 234375 D Each restricted stock unit ("RSU") represents a contingent right to receive one ARQQ ordinary share. The RSUs vest quarterly in equal installments on April 1, July 1, and October 1, 2026, and January 1, April 1, July 1, and October 1, 2027, and January 1, April 1, July 1, and October 1, 2028, and January 1, April 1, July 1, and October 1, 2029. Due to the issuer's status as a foreign private issuer pursuant to Rule 3a12-3(b) under the Securities Exchange Act of 1934 (the "Act"), the reporting person's transactions in the issuer's securities are exempt from Sections 16(b) and 16(c) of the Act. Ex. 24 - Power of Attorney /s/ Nicholas Pointon, as Attorney-in-Fact 2026-03-18