Beneficial Ownership Report Filing by Arqit Quantum Inc. CFO

This filing is a beneficial ownership report (Form 3) for Robert Michael Russell, the Chief Financial Officer of Arqit Quantum Inc. (ARQQ). As an insider, Russell is reporting his ownership of the company's securities. The filing notes that due to Arqit Quantum Inc. being a foreign private issuer, Russell's transactions are exempt from certain reporting requirements under the Securities Exchange Act of 1934. The report indicates that no securities are owned, and the signature date was June 3, 2026, for the reporting period of June 1, 2026.