Insider Transaction Report

Manfredi Lefebvre d'Ovidio, a director at Arqit Quantum Inc., reported a transaction on July 17, 2026. The transaction involved the acquisition of 673 Ordinary Shares with a price of $0.0 per share. Following this transaction, the post-transaction shares owned are 49,023. Additionally, 673 Restricted Share Units (RSUs) were disposed of, which convert to Ordinary Shares on a one-for-one basis. These RSUs vested within the week of the grant date. The reporting person also holds 4,396,891 Ordinary Shares beneficially through Heritage Assets SCSP. This filing is exempt from Section 16(b) and 16(c) of the Act due to the issuer's status as a foreign private issuer.