Registration No. 333-283752 UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 PRE-EFFECTIVE AMENDMENT NO. 1 TO THE FORM S-1 REGISTRATION STATEMENT UNDER Table of Contents As filed with the Securities and Exchange Commission on January 28, 2025 THE SECURITIES ACT OF 1933 WINCHESTER BANCORP, INC. (Exact Name of Registrant as Specified in Its Charter) (State or Other Jurisdiction of Incorporation or Organization) Maryland 6036 Applied for (Primary Standard Industrial Classification Code N ...