UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

PURSUANT TO SECTION 13 OR 15(D) OF

THE SECURITIES EXCHANGE ACT OF 1934

Date of Report (Date of earliest event reported): April 30, 2025

Winchester Bancorp, Inc.

(Exact Name of Registrant as Specified in Charter)

Maryland	001-42627	33-3361275
(State or Other Jurisdiction of Incorporation)	(Commission File No.)	(I.R.S. Employer Identification No.)

661 Main Street, Winchester, Massachusetts	01890
(Address of Principal Executive Offices)	(Zip Code)

Registrant’s telephone number, including area code: (781) 729-2130

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

☐	Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐	Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐	Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐	Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class		Trading Symbol(s)		Name of each exchange on which registered
None		None		None

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☒

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 8.01 Other Events

On April 30, 2025, Winchester Bancorp, Inc. (the “Company”) announced the closing of Winchester Savings Bank’s mutual holding company reorganization and related stock offering of the Company.

A copy of the press release is attached as Exhibit 99.1 to this current report.

Item 9.01 Financial Statements and Exhibits

(d) Exhibits

Exhibit Description

99.1 Press Release dated April 30, 2025

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned, hereunto duly authorized.

		WINCHESTER BANCORP, INC.


DATE: May 6, 2025	By:	/s/ John A. Carroll
		John A. Carroll
		President and Chief Executive Officer

Winchester Bancorp, Inc./MD/ 8-K