SCHEDULE 13G/A

Advanced Emissions Solutions Inc

Common Stock, $0.001 par value · CUSIP: 00770C101

Event date: 2025-12-31

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

• Orin Hirschman

  Shares: 2,470,950.00 · Class: 5.8%

• AIGH Capital Management LLC

  Shares: 2,273,092.00 · Class: 5.3%

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