ESGEN Acquisition (ESAC) - Prospectus(update)

As filed with the Securities and Exchange Commission on January 27, 2026 Registration No. 333-291120 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 AMENDMENT NO. 1 TO FORM S-1 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 ZEO ENERGY CORP. (Exact name of registrant as specified in its charter) (State or other jurisdiction of incorporation or organization) (Primary Standard Industrial Classification Code Number) Delaware 4931 001-40927 (I.R.S. Employer Identification Number) ...