SCHEDULE 13D/A

Arqit Quantum Inc

Ordinary Shares, par value $0.0025 per share · CUSIP: G0567U127

Event date: 2025-05-27

Reporting persons may disclose overlapping interests. Their amounts are shown individually and are not added into a filing total.

Filing-level shares

Unavailable

Percent of class

Unavailable

• Heritage Assets SCSp.Reported CIK 0001882923

  Shares: 5,776,252.00 · Class: 35.8%

• M Management S.A.

  Shares: 5,776,252.00 · Class: 35.8%

• Manfredi Lefebvre d'Ovidio

  Shares: 5,776,252.00 · Class: 35.8%

Amounts are as disclosed in this filing. Schedule type alone does not establish investment intent.