Arqit Quantum Inc. reported an insider ownership change involving Carlo Calabria, with the transaction dated July 17, 2026 and the Form 4 filed on July 21, 2026. The reported security was Arqit’s ordinary shares, traded under ticker ARQQ. The filing indicates that the ownership change related to restricted stock units, or RSUs. According to the explanatory note, the RSUs convert into Arqit ordinary shares on a one-for-one basis. The RSUs vested within the week of the grant date, meaning the award became payable in shares very shortly after being granted. The reported action therefore appears to reflect the vesting and conversion or settlement of RSUs into ARQQ ordinary shares. The text provided does not include the transaction table details typically found in a Form 4, such as the number of RSUs or shares involved, the transaction code, the deemed transaction price, or Carlo Calabria’s beneficial ownership after the transaction. No sale price or open-market purchase price is stated, and there is no indication in the provided text that the reported action involved a market sale. The key disclosed economic point is that the RSUs were settled one-for-one into ordinary shares after vesting. The filing also includes an explanatory remark tied to Arqit Quantum’s status as a foreign private issuer under Rule 3a12-3(b) of the Securities Exchange Act of 1934. Because of that status, the reporting person’s transactions in the issuer’s securities are described as exempt from Sections 16(b) and 16(c) of the Act, provisions that generally address short-swing profit recovery and certain insider trading restrictions for U.S. issuers. The form was signed on July 21, 2026 by Noleen McDonnell as attorney-in-fact for the reporting person, pursuant to a power of attorney. Overall, the filing reports an insider equity-compensation event at Arqit Quantum: RSUs held by Carlo Calabria vested shortly after grant and converted into ARQQ ordinary shares, increasing or otherwise changing his reported beneficial ownership, though the share count and post-transaction holdings are not visible in the supplied filing text.