Exhibit 99.1 Winchester Bancorp, Inc. Announces Results for the Quarter Ended December 31, 2025 WINCHESTER, MA, January 28, 2026 - Winchester Bancorp, Inc. (NASDAQ-WSBK) (the "Company"), the holding company for Winchester Savings Bank (the "Bank"), today announced its second quarter 2026 financial results. The Company reported net income of $1.1 million or$0.12 per common share compared to a net income of $373,000 for the quarter ended December 31, 2024, an increase of$701,000, or 187.9%, in net income. F ...