As filed with the Securities and Exchange Commission on January 4, 2024 No. 333- UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ____________________________ ADVANCED EMISSIONS SOLUTIONS, INC. (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) Delaware 2890 27-5472457 (Primary Standard Industrial Classification Code Number) (I.R.S. Employer Identificatio ...