9999999995-24-000266 EFFECT 1 20240131 20240201 20240131 Advanced Emissions Solutions, Inc. 0001515156 2890 08 Industrial Applications and Services 275472457 1231 EFFECT 33 333-276375 24584871 8051 E. MAPLEWOOD AVE., STE 210 GREENWOOD VILLAGE CO 80111 720-598-3500 8051 E. MAPLEWOOD AVE., STE 210 GREENWOOD VILLAGE CO 80111 EFFECT 1 primary_doc.xml UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 NOTICE OF EFFECTIVENESS Effective Date: January 31, 2024 4:30 P.M. Form: S-3 CIK: 0001515156 Company Name: Advanced Emissions Solutions, Inc. File Number: 333-276375