Arqit Quantum Inc.: General manager-US Nilan Nicholas William sold 522 shares

What happened

• Nilan Nicholas William, general manager-US, exercised/converted 959 derivative units into 959 Arqit ordinary shares on Oct 5, 2026 (acquired 959 shares at $0.00, value $0). The filing also shows an open-market sale of 522 shares on Oct 5, 2026 at $23.78 for $12,416, and a separate disposition of 959 derivative shares on Oct 5, 2026 (disposed 959 shares at $0.00, value $0).

Key details

• Transaction dates and prices: Oct 5, 2026 — exercise/conversion (M) 959 shares @ $0.00 (acquired) = $0; sale (S) 522 shares @ $23.78 (disposed) = $12,416; exercise/conversion (M) 959 shares @ $0.00 (disposed) = $0.
• Shares owned after the transaction: not stated in the provided filing.
• Footnotes: F1 — Restricted share units ("RSUs") convert one-for-one into Arqit ordinary shares. F2 — 2,879 RSUs vested on Oct 1, 2026; remaining RSUs vest quarterly on Jan 1, Apr 1, Jul 1, Oct 1 of 2027 and Jan 1, Apr 1, Jul 1, Oct 1 of 2028.
• Other: the filing notes the issuer is a foreign private issuer and the reporting person's transactions are exempt from Sections 16(b) and 16(c) of the Securities Exchange Act.

Why it may matter

• The filing shows conversion/exercise of derivative units and an open-market sale on the same date; the report does not indicate a cashless exercise.
• A filing does not show why the insider traded or why the company acted.