Insider Transaction of Arqit Quantum Inc.

Andrew Leaver, Chief Executive Officer of Arqit Quantum Inc., reported a transaction on April 1, 2026. He acquired 15,625 ordinary shares with a transaction price of $0.00 per share. This transaction is exempt from Section 16(b) of the Securities Exchange Act of 1934 due to the issuer's status as a foreign private issuer. Following this acquisition, Mr. Leaver directly owns 53,346 ordinary shares. Additionally, Mr. Leaver disposed of 15,625 Restricted Stock Units (RSUs), which convert into ordinary shares on a one-for-one basis. These RSUs were granted under a vesting schedule with installments occurring quarterly through October 2029. Post-disposal, he directly holds 218,750 RSUs. The reporting person is based in London, United Kingdom.