As filed with the Securities and Exchange Commission on October 21, 2025. Registration No. 333-290834 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 Public Policy Holding Company, Inc. (Exact Name of Registrant as Specified in its Charter) Delaware 8742 87-3557229 (I.R.S. Employer Identification Number) (Primary Standard Industrial Classification Code Number) 800 North Capitol St. NW, Suite 800 Washi ...