Form 4 Filing for Arqit Quantum Inc.

On October 1, 2026, Ben Simon Wilder, Chief Operating Officer of Arqit Quantum Inc., reported transactions involving the company's ordinary shares and Restricted Share Units (RSUs). Wilder acquired 278 ordinary shares and 167 ordinary shares through the conversion of RSUs, with a transaction price of $0.00 per share, exempt from Section 16(b) due to Arqit Quantum Inc. being a foreign private issuer. The RSUs vest quarterly through October 1, 2028. Post-transaction, Wilder holds 3860.47 ordinary shares directly and has 3887 RSUs convertible to ordinary shares. This filing is a standard disclosure of insider transactions.