Earnings release
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Exhibit 99.1 Winchester Bancorp, Inc. Announces Results for the Quarter Ended September 30, 2026 Investor Contact John A. Carroll President and Chief Executive Officer IR@WinchesterSavings.com (781) 729-2130 WINCHESTER, MA, October 28, 2026 - Winchester Bancorp, Inc. (the "Company"), the holding company for Winchester Savings Bank (the "Bank"), today announced its financial results for the quarter ended September 30, 2026, the first quarter of the six-month transition period ending December 31, 2026. The Company reported net income of $1.3 million, or $0.14 per common share, as compared to net income of $1.2 million for the quarter ended June 30, 2026, an increase of $29,000 in net income. Net income for the quarter ended September 30, 2025, was $1.0 million, making the year over year increase $306,000. “We continue to build on the momentum we established in our first year as a public company,” said John A. Carroll, President and Chief Executive Officer. “Deposit growth continued to lead the way, increasing $53.4 million, or 6.6%, during the quarter, which allowed us to fund net loan growth of $37.9 million, or 4.4%. Total assets grew $44.9 million, or 4.1%, to $1.14 billion. Profitability also continued to improve, with net interest margin expanding to 2.67% from 2.49% and our efficiency ratio improving to 73.1% from 82.8%, both compared to the three months ended September 30, 2025. We remain focused on disciplined growth and on continuing to build value for our shareholders”, Carroll added. BALANCE SHEET Total assets were $1.14 billion at September 30, 2026, representing an increase of $45.3 million, or 4.1%, from June 30, 2026. • Cash and cash equivalents were $63.2 million, reflecting an increase of $3.1 million, or 5.2%, from June 30, 2026. • Net loans were $908.7 million, representing an increase of $37.9 million, or 4.4%, from June 30, 2026, as we continued to experience strong loan demand. The main driver of the new growth was in our construction and residential portfolios, which increased $21.9 million, or 18.8%, and $14.1 million, or 3.5%, respectively, since June 30, 2026. • Investment securities totaled $123.2 million, representing a decrease of $1.8 million, or 1.5%, from June 30, 2026, due to matured mortgage backed securities. • Deposits totaled $862.7 million, representing an increase of $53.4 million, or 6.6%, since June 30, 2026. The increase in deposits was a result of growth of $33.6 million in municipal customer deposits. As a result of the increase in municipal deposits, money market accounts increased $20.2 million. Certificates of deposit and demand deposit accounts increased $29.8 million and $5.5 million, respectively, while savings accounts decreased $2.1 million. • Federal Home Loan Bank borrowings totaled $149.9 million, representing a decrease of $8.2 million, or 5.2%, from $158.2 million at June 30, 2026. • Stockholders’ equity was $119.6 million, representing a decrease of $886,000, or 0.7% from $120.5 million at June 30, 2026. The decrease was driven by an increase in comprehensive loss of $2.2 million due to higher unrealized losses on the available for sale portfolio, partially offset by net income of $1.3 million for the quarter ended September 30, 2026.
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2 NET INTEREST INCOME Net interest income was $7.2 million for the quarter ended September 30, 2026, compared to $5.7 million for the quarter ended September 30, 2025, representing an increase of $1.4 million, or 25.2%. Net interest margin expanded by 18 basis points to 2.67% for the quarter ended September 30, 2026 compared to 2.49% for the quarter ended September 30, 2025. • The increase in interest income during the quarter ended September 30, 2026, was primarily attributable to the increase in the average balance of loans and investment securities. • The increase in interest expense during the year was primarily attributable to higher average interest-bearing deposit balances, partially offset by lower average rates paid on those deposits, lower average borrowings, and reduced borrowing rates. NON-INTEREST INCOME Non-interest income was $498,000 for the quarter ended September 30, 2026, compared to $52,000 for the quarter ended September 30, 2025. Non-interest income for the quarter ended September 30, 2025 includes a one-time loss on the available for sale securities. NON-INTEREST EXPENSE Non-interest expense was $5.6 million for the quarter ended September 30, 2026, representing an increase of $821,000, or 17.1%, from the quarter ended September 30, 2025 due to increases in salaries and employee benefits, marketing and data processing expense and general and administrative expenses. ASSET QUALITY Asset quality remains strong. The allowance for credit losses on loans in total and as a percentage of total gross loans as of September 30, 2026 was $5.1 million and 0.56%, compared to $4.4 million and 0.55% as of September 30, 2025. • During the quarter ended September 30, 2026, the Company recorded no charge offs compared to net charge offs of $270,000 for the quarter ended September 30, 2025. • Non-performing assets totaled $1.9 million, or 0.17% of total assets, as of September 30, 2026, compared to $1.9 million, or 0.19% of total assets, as of September 30, 2025. ABOUT WINCHESTER BANCORP, INC. Winchester Bancorp, Inc. is the mid-tier holding company of Winchester Savings Bank and is the majority owned subsidiary of Winchester Bancorp, MHC. Winchester Savings Bank's mission is to operate and grow a profitable community-oriented financial institution that is dedicated to meeting the banking needs of individuals and small businesses in the communities in which it operates. FORWARD-LOOKING STATEMENTS Certain statements contained in this press release that are not historical facts may constitute forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended, and are intended to be covered by the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. The Company may also make forward-looking statements in other documents it files with the Securities and Exchange Commission ("SEC"), in our annual reports to shareholders, in press releases and other written materials, and in oral statements made by our officers, directors or employees. You can identify forward looking statements by the use of the words “believe,” “expect,” “anticipate,” “intend,” “estimate,” “assume,” “outlook,” “will,” “should,” and other expressions that predict or indicate future events and trends and which do not relate to historical matters, including statements regarding the Company’s business, credit quality, financial condition, liquidity and results of operations. Forward-looking statements may differ, possibly materially, from what is included in this press release due to factors and future developments that are uncertain and beyond the scope of the Company’s control. These include, but are not limited to, changes in interest rates; general economic conditions (including the impact of ongoing armed conflicts, tariffs, inflation, and concerns about liquidity) on a national basis or in the local markets in which the Company operates; ongoing turbulence in the capital and
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3 debt markets; competitive pressures from other financial institutions; changes in consumer behavior due to changing political, business and economic conditions, or legislative or regulatory initiatives; increases in loan and lease default and charge-off rates; the adequacy of allowances for loan and lease losses; decreases in deposit levels that necessitate increases in borrowing to fund loans and investments; operational risks including, but not limited to, cybersecurity incidents, fraud, natural disasters, and future pandemics; changes in regulation; the possibility that future credit losses may be higher than currently expected due to changes in economic assumptions and adverse economic developments; and changes in assumptions used in making such forward-looking statements. Forward-looking statements involve risks and uncertainties which are difficult to predict. The Company’s actual results could differ materially from those projected in the forward-looking statements as a result of, among others, the risks outlined in the Company’s Annual Report on Form 10- K, as updated by its Quarterly Reports on Form 10-Q and other filings submitted to the SEC. The Company does not undertake any obligation to update any forward-looking statement to reflect circumstances or events that occur after the date the forward-looking statements are made.
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4 Winchester Bancorp, Inc. and Subsidiaries Consolidated Balance Sheets (unaudited) (Dollars in thousands, except share and per share data) September 30, June 30, 2026 2026 Assets Cash and due from banks $ 1,370 $ 1,283 Interest-bearing deposits 61,803 58,764 Total cash and cash equivalents 63,173 60,047 Securities available for sale, at fair value (amortized cost of $69,834 at September 30, 2026 and $69,620 at June 30, 2026) 66,144 68,776 Securities held to maturity, at amortized cost 57,013 56,228 Federal Home Loan Bank stock, at cost 6,312 6,791 Loans, net of allowance for credit losses of $5,133 at September 30, 2026 and $4,783 at June 30, 2026 908,696 870,773 Bank owned life insurance 16,549 11,397 Premises and equipment, net 5,799 5,590 Accrued interest receivable 3,818 4,034 Net deferred tax asset 1,726 1,092 Other assets 11,956 11,208 $ 1,141,186 $ 1,095,936 Liabilities and stockholders' equity Non-interest-bearing deposits $ 63,372 $ 63,168 Interest-bearing deposits 799,280 746,068 Federal Home Loan Bank advances 149,923 158,158 Mortgagors’ escrow accounts 2,125 1,809 Accrued expenses and other liabilities 6,859 6,220 Total liabilities 1,021,559 975,423 Commitments and contingencies Preferred stock, $.01 par value, 5,000,000 shares authorized, none outstanding — — Common stock, $.01 par value, 20,000,000 shares authorized, 9,295,376 issued and outstanding as of September 30, 2026 and June 30, 2026 93 93 Additional paid-in capital 39,599 39,586 Unearned compensation (ESOP) (3,108) (3,151) Retained earnings 86,409 85,141 Accumulated other comprehensive loss (3,366) (1,156) Total stockholders' equity 119,627 120,513 Total liabilities and stockholders' equity $ 1,141,186 $ 1,095,936
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5 Winchester Bancorp, Inc. and Subsidiaries Consolidated Statements of Operations (unaudited) (Dollars in thousands, except share and per share data) Three months ended September 30, 2026 2025 (In thousands, except share data) Interest and dividend income: Interest and fees on loans $ 12,440 $ 10,402 Interest and dividends on securities 1,254 1,113 Interest on federal funds sold and other interest-bearing deposits 489 422 Total interest and dividend income 14,183 11,937 Interest expense: Interest on deposits 5,708 4,670 Interest on Federal Home Loan Bank advances 1,287 1,526 Total interest expense 6,995 6,196 Net interest income 7,188 5,741 Provision (benefit) for credit losses 415 (320) Net interest income, after provision (benefit) for credit losses 6,773 6,061 Non-interest income: Customer service fees 229 191 Income on bank owned life insurance 152 119 Loss on available for sale securities, net — (317) Miscellaneous 117 59 Total non-interest income 498 52 Non-interest expense: Salaries and employee benefits 3,147 2,697 Occupancy and equipment, net 420 396 Data processing 480 408 Deposit insurance 195 210 Marketing and advertising 266 184 Other general and administrative 1,108 900 Total non-interest expense 5,616 4,795 Income before income taxes 1,655 1,318 Provision for income taxes 387 356 Net income $ 1,268 $ 962 Share Data: Average common shares outstanding, basic and diluted 8,981,699 8,964,893 Basic and diluted net income per share $ 0.14 $ 0.11
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6 Winchester Bancorp, Inc. and Subsidiaries Average Balances and Yields (unaudited) For the Three Months Ended September 30, 2026 2025 AverageOutstandingBalance Interest AverageYield/Rate (1) AverageOutstandingBalance Interest AverageYield/Rate (1) (Dollars in thousands) Interest-earning assets: Loans $ 899,041 $ 12,440 5.53% $ 775,015 $ 10,402 5.37% Securities 126,051 1,254 3.98% 109,870 1,113 4.05% Federal funds sold and other interest- bearing deposits 49,879 489 3.92% 36,551 422 4.62% Total interest-earning assets 1,074,971 14,183 5.28% 921,436 11,937 5.18% Non-interest-earning assets 49,676 43,149 Allowance for credit losses on loans (4,867) (4,180) Total assets $ 1,119,780 $ 960,405 Interest-bearing liabilities: NOW and demand deposits $ 53,356 17 0.13% $ 55,599 4 0.03% Savings accounts 147,594 751 2.04% 159,587 916 2.30% Money market accounts 270,955 2,177 3.21% 133,819 1,102 3.29% Certificates of deposit 311,505 2,763 3.55% 280,536 2,648 3.78% Total interest-bearing deposits 783,410 5,708 2.91% 629,541 4,670 2.97% Borrowings 131,675 1,287 3.91% 141,294 1,526 4.32% Total interest-bearing liabilities 915,085 6,995 3.06% 770,835 6,196 3.22% Non-interest bearing demand accounts 71,290 62,528 Other non-interest-bearing liabilities 11,692 11,018 Total liabilities 998,067 844,381 Stockholders' equity 121,713 116,024 Total liabilities and stockholders' equity $ 1,119,780 $ 960,405 Net interest income $ 7,188 $ 5,741 Net interest rate spread (2) 2.22% 1.96% Net interest-earning assets (3) $ 159,886 $ 150,601 Net interest margin (4) 2.67% 2.49% Average interest-earning assets to average interest-bearing liabilities 117.47% 119.54% (1) Annualized. (2) Net interest rate spread represents the difference between the weighted average yield on interest-earning assets and the weighted average rate of interest-bearing liabilities. (3) Net interest-earning assets represent total interest-earning assets less total interest-bearing liabilities. (4) Net interest margin represents net interest income divided by average total interest-earning assets.
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7 Winchester Bancorp, Inc. and Subsidiaries Selected Financial Highlights (unaudited) (Dollars in thousands, except share and per share data) For the three months ended September 30, 2026 2025 Earnings Data Net interest income $ 7,188 $ 5,741 Non-interest income 498 52 Total net interest income and non-interest income 7,686 5,793 Provision (benefit) for credit losses 415 (320) Non-interest expense 5,616 4,795 Pre-tax income 1,655 1,318 Net income 1,268 962 Per share Data Basic and diluted earnings per share $ 0.14 $ 0.11 Book value per share $ 13.00 $ 12.59 Earnings Return on average assets 0.45% 0.40% Return on average stockholders' equity 4.17% 3.32% Net interest margin 2.67% 2.49% Cost of deposits 2.91% 2.97% Efficiency ratio 73.07% 82.77% Balance Sheet Total assets $ 1,141,186 $ 1,005,212 Loans, net $ 908,696 $ 793,184 Total stockholders' equity $ 119,627 $ 116,992 Asset quality Allowance for credit losses (ACL) $ 5,133 $ 4,356 ACL/Total loans 0.56% 0.55% ACL/Total nonperforming loans (NPLs) 270.02% 224.67% Net charge-offs/average total loans — (0.03)% Capital Ratios Stockholders' equity/total assets 10.48% 11.64%