SCHEDULE 13D/A

Hallador Energy Co

Common Stock, par value $0.01 · CUSIP: 40609P105

Event date: 2026-01-01

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

• Hallador Alternative Assets Fund LLCReported CIK 0001356544

  Shares: 1,584,929.00 · Class: 3.62%

• Hallador Investment Advisors, Inc.

  Shares: 1,584,929.00 · Class: 3.62%

• Hallador Management LLC

  Shares: 1,584,929.00 · Class: 3.62%

• David C. HardieReported CIK 0001166809

  Shares: 1,607,945.00 · Class: 3.67%

• Kevin Leary

  Shares: 1,591,319.00 · Class: 3.63%

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