SCHEDULE 13D/A

PRIMEENERGY CORP

Common Stock (par value $0.10 per share) · CUSIP: 74158E104

Event date: 2026-01-13

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

• de Rothschild RobertReported CIK 0001015878

  Shares: 201,906 · Class: 12.4%

• Amrace Inc.

  Shares: 201,906 · Class: 12.4%

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