WSBK

WINCHESTER, Mass., July 30, 2026--(BUSINESS WIRE)--Winchester Bancorp, Inc. (NASDAQ-WSBK) (the "Company"), the holding company for Winchester Savings Bank (the "Bank"), today announced its fiscal 2026 financial results. The Company reported net income of $4.4 million, or $0.49 per common share, as compared to net loss of $874,000 for the year ended June 30, 2025, an increase of $5.3 million in net income. Operating net income for the year ended June 30, 2025, which excludes our contribution to the Winchester Savings Bank Charitable Foundation, Inc. (the "Charitable Foundation"), was $750,000 (non-GAAP), making the year over year increase $3.7 million on an adjusted basis. "In our first full year as a public company, we've demonstrated the ability to deploy capital prudently to grow the franchise. Loan and deposit growth were both impressive year-over-year, up $119.6 million, or 15.9% and $130.1 million, or 19.1%, respectively. Total assets grew more than $146.5 million, or 15.4%, while profitability also improved, with margin expanding to 2.55% from 2.05% and efficiency improving to 75.2% from 85.5% (non-GAAP), both compared to June 30, 2025," said John A. Carroll, President and Chief Executive Officer. "Our first year as a public company was a strong one, from establishing our municipal department to delivering double digit growth and improved earnings. We look forward to building on that momentum as we enter our second year of creating shareholder value," Carroll added. BALANCE SHEET Total assets were $1.10 billion at June 30, 2026, representing an increase of $146.6 million, or 15.4%, from June 30, 2025. Cash and cash equivalents were $60.0 million, reflecting an increase of $4.8 million, or 8.7%, from June 30, 2025. Net loans were $870.8 million, representing an increase of $119.6 million, or 15.9%, from June 30, 2025, as we continued to experience strong loan demand. The main driver of the new growth was in our residential and multifamily portfolios, which increased $47.6 million, or 13.3%, and $45.9 million, or 27.6%, respectively, since June 30, 2025. Investment securities totaled $125.0 million, representing an increase of $20.5 million, or 19.6%, from June 30, 2025, due to purchases of U.S. Treasury bonds and government agency securities. Deposits totaled $809.2 million, representing an increase of $130.1 million, or 19.1%, since June 30, 2025. The increase in deposits was a result of growth of $135.6 million in municipal customer deposits. As a result of the increase in municipal deposits, money market accounts increased $140.0 million. Savings accounts and certificates of deposit decreased $10.3 million and $1.6 million, respectively, while demand deposit accounts increased $2.0 million. Federal Home Loan Bank borrowings totaled $158.2 million, representing an increase of $11.2 million, or 7.6%, from $147.0 million at June 30, 2025. Stockholders’ equity was $120.5 million, representing an increase of $5.2 million, or 4.5% from $115.4 million from June 30, 2025. The increase was driven by net income of $4.4 million for the year ended June 30, 2026 and a decrease in accumulated other comprehensive loss of $530,000. NET INTEREST INCOME Net interest income was $25.0 million for the year ended June 30, 2026, compared to $17.5 million for the year ended June 30, 2025, representing an increase of $7.5 million, or 42.6%. Net interest margin expanded by 50 basis points to 2.55% for the year ended June 30, 2026 compared to 2.05% for the year ended June 30, 2025. The increase in interest income during the year ended June 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 $1.3 million for the year ended June 30, 2026, compared to $1.8 million for the year ended June 30, 2025. Non-interest income for the year ended June 30, 2025 includes a one-time gain on the sale of equity securities. NON-INTEREST EXPENSE Non-interest expense was $19.8 million for the year ended June 30, 2026, representing an increase of $1.0 million, or 5.2%, from the year ended June 30, 2025 due to increases in salaries and employee benefits, marketing and data processing expense offset by a decrease in other general and administrative expenses as the prior year included a $2.3 million charitable foundation contribution. 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 June 30, 2026 was $4.8 million and 0.55%, compared to $4.2 million and 0.55% as of June 30, 2025. During the year ended June 30, 2026, the Company recorded $597,000 of net charge offs compared to net charge offs of $1.4 million for the year ended June 30, 2025. Non-performing assets totaled $1.6 million, or 0.15% of total assets, as of June 30, 2026, a decrease from $2.2 million, or 0.23% of total assets, as of June 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 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. NON-GAAP FINANCIAL MEASURES The Company uses certain non-GAAP financial measures, such as operating net income, noninterest expense on an operating basis, noninterest income on an operating basis, operating return on average shareholders' equity, operating return on average assets annualized, efficiency ratio, and diluted earnings per share excluding contribution to the Charitable Foundation. These non-GAAP financial measures provide information for investors to effectively analyze financial trends of ongoing business activities, and to enhance comparability with peers across the financial services sector. A detailed reconciliation table of the Company's GAAP to the non-GAAP measures is attached. View source version on businesswire.com: https://www.businesswire.com/news/home/20260730230821/en/ Contacts Investor Contact John A. CarrollPresident and Chief Executive [email protected] (781) 729-2130

WINCHESTER, Mass., April 29, 2026--(BUSINESS WIRE)--Winchester Bancorp, Inc. (NASDAQ-WSBK) (the "Company"), the holding company for Winchester Savings Bank (the "Bank"), today announced its third quarter 2026 financial results. The Company reported net income of $1.1 million or $0.13 per common share compared to net income of $305,000 for the quarter ended March 31, 2025, an increase of $840,000, or 275.4%, in net income. For the nine months ended March 31, 2026, the Company reported net income of $3.2 million, or $0.36 per common share, as compared to net income of $46,000 for the nine months ended March 31, 2025, an increase of $3.1 million in net income. "We are extremely pleased with third quarter results, driven by strong loan and deposit growth and continued margin expansion. Loan growth of $40.4 million outpaced deposit growth of $37.4 million as management strategically prioritized growing the loan portfolio in advance of significant payoffs anticipated in the fourth quarter. Our newly established municipal channel continues to generate value and has enabled us to restructure wholesale funding more effectively. Year-over-year, net interest margin expanded by 52 basis points, while return on average assets improved to 0.44%, up from 0.14% in the third quarter of 2025. Net income was $0.13 per common share for the quarter, and the efficiency ratio improved meaningfully to 72.7%, compared to 92.5% in the third quarter of 2025. As we enter the final quarter of our fiscal year, we are pleased to announce the expansion of our branch network with a new location in Wakefield, MA. We remain steadfast in our commitment to delivering shareholder value and are optimistic about the trajectory of our strategic plan as we start our second year as a publicly traded company," said John A. Carroll, President and Chief Executive Officer. BALANCE SHEET Total assets were $1.06 billion at March 31, 2026, representing an increase of $107.7 million, or 11.3%, from June 30, 2025. Cash and cash equivalents were $54.0 million, reflecting a decrease of $1.3 million from June 30, 2025. Net loans were $840.5 million, representing an increase of $89.3 million or 11.9%, from June 30, 2025, as we continue to experience strong loan demand. The main driver of the new growth was in our multifamily and residential portfolios which increased $49.6 million, or 29.8%, and $31.7 million or 8.9%, respectively, since June 30, 2025. Investment securities totaled $124.0 million, representing an increase of $19.5 million, or 34.1%, from June 30, 2025. Deposits totaled $783.7 million, representing an increase of $104.5 million, or 15.4% since June 30, 2025. The increase in deposits was a result of growth of $105.3 million in municipal customer deposits. As a result of the increase in municipal deposits, money market accounts increased $108.7 million. Savings accounts and certificates of deposit have decreased $4.8 million and $4.2 million, respectively, while demand deposit accounts have increased $4.8 million. FHLB borrowings totaled $146.9 million, representing a decrease of $117,000 or 0.1% from $147.0 million at June 30, 2025. Stockholders’ equity was $119.1 million, representing an increase of $3.8 million from $115.4 million, or 3.3% from June 30, 2025. The increase was driven by net income of $3.2 million for the nine months ended March 31, 2026 and a decrease in accumulated other comprehensive loss of $457,000. NET INTEREST INCOME Net interest income was $6.3 million for the quarter ended March 31, 2026, compared to $4.4 million for the quarter ended March 31, 2025, representing an increase of $1.9 million, or 44.0%. Net interest margin expanded by 52 basis points to 2.54% for the quarter ended March 31, 2026 compared to 2.02% for the quarter ended March 31, 2025. The increase in interest income during the quarter ended March 31, 2026 was primarily attributable to the increase in the average balance of loans and investment securities. The decrease in interest expense during the quarter was attributable to the decrease in average rates on interest bearing deposit accounts and a decrease in average borrowings as well as lower borrowing rates. NON-INTEREST INCOME Non-interest income was $367,000 for the quarter ended March 31, 2026 compared to $299,000 for the quarter ended March 31, 2025. NON-INTEREST EXPENSE Non-interest expense was $4.8 million for the quarter ended March 31, 2026, representing an increase of $524,000 or 12.1% from the quarter ended March 31, 2025 due to a higher reserve for off balance sheet commitments and an increase in data processing and salaries and employee benefits expense. 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 March 31, 2026 was $4.5 million and 0.54%, compared to $4.1 million and 0.55%, as of June 30, 2025, and $3.6 million and 0.49% as of March 31, 2025. During the quarter ended March 31, 2026, the Company recorded $12,000 of net charge offs compared to net charge offs of $50,000 for the quarter ended March 31, 2025. Non-performing assets totaled $1.7 million, or 0.16% of total assets, as of March 31, 2026, decrease from $1.9 million, or 0.20% of total assets, as of March 31, 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 This press release contains forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934, which can be identified by the use of words such as "estimate," "project," "believe," "intend," "anticipate," "assume," "plan," "seek," "expect," "will," "may," "should," "indicate," "would," "contemplate," "continue," "target" and words of similar meaning. These forward-looking statements are based on our current beliefs and expectations and are inherently subject to significant business, economic and competitive uncertainties and contingencies, many of which are beyond our control. In addition, these forward-looking statements are subject to assumptions with respect to future business strategies and decisions that are subject to change. Certain factors that could cause actual results to differ materially from expected results include increased competitive pressures, demand for loan products, deposit flows, changes in the interest rate environment, the effects of inflation, general economic conditions (including potential recessionary conditions) or conditions within the securities markets, monetary and fiscal policies of the U.S. Government, including policies of the U.S. Treasury and the Board of Governors of the Federal Reserve Board; changes in the quality, size and composition of our loan and securities portfolios, changes in liquidity, including the size and composition of our deposit portfolio, and the percentage of uninsured deposits in the portfolio; changes in asset quality, prepayment speeds, charge-offs and/or credit loss provisions, our ability to access cost-effective funding; the effects of continued U.S. Government shutdown; changes in demand for our products and services; legislative, accounting, tax and regulatory changes; the imposition of tariffs or other domestic or international governmental policies; the current or anticipated impact of military conflict, terrorism or other geopolitical events; a failure in or breach of our operational or security systems or infrastructure, including cyberattacks that could adversely affect the Company's financial condition and results of operations and the business in which the Company and the Bank are engaged, the failure to maintain current technologies and the failure to retain or attract employees. You should not place undue reliance on forward-looking statements. Winchester Bancorp, Inc. undertakes no obligation to revise these forward-looking statements or to reflect events or circumstances after the date of this press release. View source version on businesswire.com: https://www.businesswire.com/news/home/20260429034888/en/ Contacts Investor Contact John A. Carroll President and Chief Executive Officer [email protected] (781) 729-2130

WINCHESTER, Mass., January 28, 2026--(BUSINESS WIRE)--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. For the six months ended December 31, 2025, the Company reported net income of $2.0 million, or $0.23 per common share, as compared to a net loss of $259,000, for the six months ended December 31, 2024, an increase of $2.3 million in net income. "The Bank had a successful second quarter, highlighted by continued loan demand, strong deposit growth and margin improvements. Deposit growth of $29.9 million outpaced loan growth of $7.0 million during the quarter as our newly established municipal channel continues to add value allowing us to restructure wholesale funding. Margin improvements are a result of a more stabilized interest rate environment and balance sheet growth. Net income was $0.12 per common share for the quarter and other financial metrics such as book value per share, efficiency and loan to deposit ratio, continue to trend in the right direction. As we enter the third quarter, we will continue to pursue our strategic plan and focus on orderly and disciplined capital management and balance sheet growth," said John A. Carroll, President and Chief Executive Officer. BALANCE SHEET Total assets were $1.02 billion on December 31, 2025, representing an increase of $66.5 million, or 7.0%, from June 30, 2025. Cash and cash equivalents were $54.8 million, reflecting a decrease of $459,000 from June 30, 2025. Net loans were $800.2 million, representing an increase of $48.9 million or 6.5%, from June 30, 2025, as demand for new originations continues to be strong. The main driver of the new growth was in multifamily which has increased $24.4 million, or 14.6%, since June 30, 2025. Residential real estate and construction loans also increased by $10.8 million and $8.9 million, respectively. Investment securities totaled $122.7 million, representing an increase of $7.4 million or 6.4% for the quarter due to purchases of U.S. treasuries and government agency securities. Deposits totaled $746.3 million, representing an increase of $67.1 million, or 9.9% since June 30, 2025. The increase in deposits was a result of growth of $63.2 million in municipal customer deposits. As a result of the increase in municipal deposits, money market accounts increased $76.6 million. Savings accounts and certificates of deposit decreased $8.9 million and $9.9 million, respectively, while demand deposit accounts increased $9.3 million. FHLB borrowings totaled $143.6 million, representing a decrease of $3.4 million or 2.3% from $147.0 million from June 30, 2025. Stockholders’ equity was $118.2 million, representing an increase of $2.9 million from $115.4 million, or 2.5% from June 30, 2025. The increase was driven by net income of $2.0 million for the six months ended December 31, 2025 and a decrease in accumulated other comprehensive loss of $758,000. NET INTEREST INCOME Net interest income was $6.1 million for the quarter ended December 31, 2025, compared to $4.0 million for the quarter ended December 31, 2024, representing an increase of $2.0 million, or 50.4%. Net interest margin expanded by 59 basis points to 2.51% for the quarter ended December 31, 2025 compared to 1.92% for the quarter ended December 31, 2024. The increase in interest income during the quarter ended December 31, 2025 was primarily attributable to the increase in the average balance of loans and investment securities. The decrease in interest expense during the quarter was attributable to the decrease in average rates on interest bearing deposit accounts. NON-INTEREST INCOME Non-interest income was $382,000 for the quarter ended December 31, 2025 compared to $388,000 for the quarter ended December 31, 2024. NON-INTEREST EXPENSE Non-interest expense was $4.7 million for the quarter ended December 31, 2025, representing a decrease of $88,000 or 1.8% from the prior quarter due primarily to a decrease in employee benefits due to lower payroll taxes and bonus expense. 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 December 31, 2025 was $4.4 million and 0.55%, compared to $4.1 million and 0.55%, as of June 30, 2025, and $3.6 million and 0.50% as of December 31, 2024. During the quarter ended December 31, 2025, the Company recorded net charge offs of $310,000 compared to net charge offs of $270,000 for the quarter ended September 30, 2025. Non-performing assets totaled $3.6 million, or 0.36% of total assets, as of December 31, 2025, an increase of $1.7 million from $1.9 million, or 0.24% of total assets, as of September 30, 2025. The increase was primarily due to one construction loan that was placed on non-accrual during the quarter. ABOUT WINCHESTER BANCORP, INC. Winchester Bancorp, Inc. is a 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 This press release contains forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934, which can be identified by the use of words such as "estimate," "project," "believe," "intend," "anticipate," "assume," "plan," "seek," "expect," "will," "may," "should," "indicate," "would," "contemplate," "continue," "target" and words of similar meaning. These forward-looking statements are based on our current beliefs and expectations and are inherently subject to significant business, economic and competitive uncertainties and contingencies, many of which are beyond our control. In addition, these forward-looking statements are subject to assumptions with respect to future business strategies and decisions that are subject to change. Certain factors that could cause actual results to differ materially from expected results include increased competitive pressures, demand for loan products, deposit flows, changes in the interest rate environment, the effects of inflation, general economic conditions (including potential recessionary conditions) or conditions within the securities markets, monetary and fiscal policies of the U.S. Government, including policies of the U.S. Treasury and the Board of Governors of the Federal Reserve Board; changes in the quality, size and composition of our loan and securities portfolios, changes in liquidity, including the size and composition of our deposit portfolio, and the percentage of uninsured deposits in the portfolio; changes in asset quality, prepayment speeds, charge-offs and/or credit loss provisions, our ability to access cost-effective funding; the effects of continued U.S. Government shutdown; changes in demand for our products and services; legislative, accounting, tax and regulatory changes; the imposition of tariffs or other domestic or international governmental policies; the current or anticipated impact of military conflict, terrorism or other geopolitical events; a failure in or breach of our operational or security systems or infrastructure, including cyberattacks that could adversely affect the Company's financial condition and results of operations and the business in which the Company and the Bank are engaged, the failure to maintain current technologies and the failure to retain or attract employees. You should not place undue reliance on forward-looking statements. Winchester Bancorp, Inc. undertakes no obligation to revise these forward-looking statements or to reflect events or circumstances after the date of this press release. View source version on businesswire.com: https://www.businesswire.com/news/home/20260128893605/en/ Contacts Investor Contact John A. Carroll President and Chief Executive Officer [email protected] (781) 729-2130

WINCHESTER, Mass., October 22, 2025--(BUSINESS WIRE)--Winchester Bancorp, Inc. (NASDAQ-WSBK) (the "Company"), the holding company for Winchester Savings Bank (the "Bank"), today announced its first quarter financial results. The Company reported net income of $962 thousand or $0.11 cents per common share compared to a net loss of $920 thousand or ($0.10) per common share for the prior quarter, an increase of $1.9 million in net income. The net loss during the quarter ended June 30, 2025, was driven by the $2.3 million contribution to the Winchester Savings Bank Charitable Foundation made in connection with our public offering. "Our first quarter was an exciting time for the Company, marking the start of a new chapter in the Bank’s 154-year history. After the completion of the stock offering, the team focused on the execution of our growth strategy. Loan and deposit growth were strong at $42.0 million and $37.2 million, respectively, which brought total assets to over $1 billion. Management launched a new deposit channel focusing on municipal deposits which should continue to contribute to strong deposit growth for the remainder of our fiscal year. We look forward to continuing to gain market share as we prudently grow our customer base and deliver value for all our shareholders." said John A. Carroll, President and Chief Executive Officer. BALANCE SHEET Total assets were $1.05 billion on September 30, 2025, representing an increase of $55.8 million, or 5.9%, from June 30, 2025. Cash and cash equivalents increased $2.5 million, or 4.5%, to $57.7 million from $55.2 million. Net loans were $793.2 million, representing an increase of $42.0 million or 5.6% from June 30, 2025 as demand for new originations continued. The main driver of the new growth was in construction and commercial real estate loans, which increased $15.5 million and $13.4 million, respectively. The multi-family and residential real estate portfolios also increased $7.1 million and $5.7 million, respectively. Investment securities totaled $115.4 million, representing an increase of $10.8 million or 19.0% for the quarter due to purchases of U.S. treasuries and government agency securities. Deposits totaled $716.4 million, representing an increase of $37.2 million, or 5.5% from the prior quarter. The increase in deposits was a result of growth of $38.9 million in municipal customer deposits. As a result of the increase in municipal deposits money market accounts increased $48.8 million. Certificate of deposit and savings accounts decreased $8.5 million and $4.6 million, respectively, while demand deposit accounts increased $1.5 million. FHLB borrowings totaled $164 million, representing an increase of $17 million or 11.6% from $147 million on June 30, 2025. Stockholders’ equity was $117.0 million, representing an increase of $1.6 million from $115.4 million, or 1.4% from June 30, 2025. The increase was driven by net income of $962 thousand and decrease in other comprehensive loss of $614 thousand. NET INTEREST INCOME Net interest income was $5.7 million for the quarter ended September 30, 2025, compared to $5.3 million for the prior quarter, representing an increase of $393 thousand, or 7.3%. Net interest income was $3.8 million for the same period last year, representing an increase of $2 million, or 52.4%. Net interest margin increased nine basis points for the quarter. Compared to the same quarter last year, net interest margin has expanded 65 basis points to 2.49% from 1.84%. The increase in interest income during the quarter ended September 30, 2025 was primarily attributable to the increase in the average balance of loans and higher yields on investment securities as a result of new purchases and additional restructuring of the existing investment portfolio. The decrease in interest expense during the quarter was attributable to the decrease in average rates on interest bearing deposit accounts. PROVISION FOR CREDIT LOSS Provision for credit loss decreased by $1 million during the quarter, partially due to the change in the loan loss methodology from the Federal Reserve developed Scaled CECL Allowance for Credit Losses Estimator (SCALE) method to the Discounted Cash Flow (DCF) model, a release of reserves due to lower off balance sheet commitments and changes to reserves for individually assessed loans. Due to the change in methodology provision for credit losses on loans increased by $561 thousand while provision for credit losses on off balance sheet commitments decreased by $718 thousand representing a net change of $158 thousand. The prior quarter includes a $270 thousand reserve on an individually assessed credit. There was an additional release of $86 thousand in the reserve for off balance sheet commitments compared to an increase of $77 thousand in off balance sheet reserves recorded in the prior quarter. NON-INTEREST INCOME Non-interest income decreased during the quarter due to a $317 thousand loss on sale of available-for-sale securities as management restructured part of the portfolio to take advantage of higher yielding investments. NON-INTEREST EXPENSE Non-interest expense was $4.8 million for the quarter ended September 30, 2025, compared to $6.8 million in the prior quarter. Prior quarter expense includes a $2.3 million contribution to the Winchester Savings Bank Charitable Foundation. Excluding the charitable foundation contribution, non-interest expense increased $322 thousand from the prior quarter. Audit, legal, and data processing fees increased during the quarter, offset by decreases in employee benefits due to lower expenses related to the pension plan. 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, 2025 was $4.4 million and 0.55%, respectively, as compared to $4.1 million and 0.55%, respectively, as of June 30, 2025. During the quarter ended September 30, 2025, the Company recorded net charge offs of $270 thousand compared to no charge offs for the quarter ended June 30, 2025. Total non-performing assets were $1.9 million, or 0.24%, of total assets as of September 30, 2025, and $2.2 million, or 0.23% of total assets, as of June 30, 2025. ABOUT WINCHESTER BANCORP, INC. Winchester Bancorp, Inc. is a 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 This press release contains forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934, which can be identified by the use of words such as "estimate," "project," "believe," "intend," "anticipate," "assume," "plan," "seek," "expect," "will," "may," "should," "indicate," "would," "contemplate," "continue," "target" and words of similar meaning. These forward-looking statements are based on our current beliefs and expectations and are inherently subject to significant business, economic and competitive uncertainties and contingencies, many of which are beyond our control. In addition, these forward-looking statements are subject to assumptions with respect to future business strategies and decisions that are subject to change. Certain factors that could cause actual results to differ materially from expected results include increased competitive pressures, demand for loan products, deposit flows, changes in the interest rate environment, the effects of inflation, general economic conditions (including potential recessionary conditions) or conditions within the securities markets, monetary and fiscal policies of the U.S. Government, including policies of the U.S. Treasury and the Board of Governors of the Federal Reserve Board; changes in the quality, size and composition of our loan and securities portfolios, changes in liquidity, including the size and composition of our deposit portfolio, and the percentage of uninsured deposits in the portfolio; changes in asset quality, prepayment speeds, charge-offs and/or credit loss provisions, our ability to access cost-effective funding; the effects of continued U.S. Government shutdown; changes in demand for our products and services; legislative, accounting, tax and regulatory changes; the imposition of tariffs or other domestic or international governmental policies; the current or anticipated impact of military conflict, terrorism or other geopolitical events; a failure in or breach of our operational or security systems or infrastructure, including cyberattacks that could adversely affect the Company's financial condition and results of operations and the business in which the Company and the Bank are engaged, the failure to maintain current technologies and the failure to retain or attract employees. You should not place undue reliance on forward-looking statements. Winchester Bancorp, Inc. undertakes no obligation to revise these forward-looking statements or to reflect events or circumstances after the date of this press release. View source version on businesswire.com: https://www.businesswire.com/news/home/20251022547282/en/ Contacts Investor Contact John A. Carroll President and Chief Executive Officer [email protected] (781) 729-2130

WINCHESTER, Mass., July 30, 2025--(BUSINESS WIRE)--Winchester Bancorp, Inc. (NASDAQ-WSBK) (the "Company"), the holding company for Winchester Savings Bank (the "Bank"), today announced its 2025 financial results. As described in the prospectus for its initial public offering ("IPO"), concurrent with the completion of its reorganization and stock offering, the Company made a one-time donation of $400,000 in cash and 185,907 shares of common stock to the Winchester Savings Bank Charitable Foundation at a total market value of $2.3 million, resulting in an after-tax charge of $1.6 million. As a result of this contribution the Company reported a net loss of $874,000 for the year ended June 30, 2025, compared to net income of $786,000 for the year ended June 30, 2024. Net income excluding the charitable foundation contribution (non-GAAP) was $750,000 for the year ended June 30, 2025, compared to $786,000 for the year ended June 30, 2024. Non-GAAP reconciliation tables are included in this release. "In the fourth quarter, we completed our reorganization and concurrent stock offering, building on our 154-year legacy. Both the capital we raised, and the newly formed Winchester Savings Bank Charitable Foundation, will positively impact our customers and the communities we serve for many years to come," said John A. Carroll, President and Chief Executive Officer. BALANCE SHEET Total assets were $949.4 million as of June 30, 2025, representing an increase of $96.4 million, or 11.3%, from June 30, 2024. Cash and cash equivalents increased to $55.2 million from $44.1 million, a $11.1 million, or 25.2%, year over year as a result of the cash raised in the reorganization and stock offering. Net loans were $751.2 million, representing an increase of $69.3 million or 10.2% from the prior year as demand for new originations continued. The main driver of the new growth was in multi-family, residential real estate and commercial real estate loans, which increased $41.8 million, $18.8 million and $16.9 million, respectively, partially offset by a decline in the construction portfolio of $5.5 million. Investment securities totaled $104.5 million, representing an increase of $17.9 million or 20.6% from the prior year due to purchases of U.S. treasuries and government agency securities. Deposits totaled $679.2 million, representing an increase of $43.8 million, or 6.9% from the prior year. The increase in deposits was a result of growth in customer deposits, primarily money market and certificate of deposit accounts, which increased by $35.1 million and $21.0 million, respectively, partially offset by decreases in savings and demand deposit accounts, which decreased by $8.2 million and $4.1 million, respectively. Shareholders’ equity was $115.4 million, representing an increase of $35.1 million from $80.3 million, or 43.7% from the prior year. The increase was driven by net stock offering proceeds, which totaled $37.8 million partially offset by the one-time contribution to the Charitable Foundation and $3.3 million for the purchase of 334,633 shares of common stock by the employee stock ownership plan ("ESOP") in the offering. NET INTEREST INCOME Net interest income was $17.5 million for the year ended June 30, 2025, compared to $14.4 million for the prior year, representing an increase of $3.1 million, or 21.9%. The increase in net interest income was primarily driven by an increase in net interest margin of 15 basis points, to 2.05% for the year ended June 30, 2025, compared to 1.90% for the prior year. The increase in interest income during the year ended June 30, 2025 was primarily attributable to an increase in average earning assets of $100.0 million, and an increase of 38 basis points in average asset yields. The increase in interest expense during the year ended June 30, 2025 was driven by increases in average interest-bearing liabilities of $94.0 million, along with an increase of 23 basis points in the average cost of interest-bearing liabilities. NON-INTEREST EXPENSE Non-interest expense was $18.8 million for the year ended June 30, 2025, compared to $14.9 million for the prior year, representing an increase of $3.9 million, or 26.2%. Other general and administrative expense in 2025 include $2.3 million of expense resulting from the contribution to the Winchester Savings Bank Charitable Foundation in connection with the Company’s reorganization and stock offering. 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 June 30, 2025 was $4.2 million and 0.55%, respectively, as compared to $3.5 million and 0.50%, respectively, as of June 30, 2024. The Company recorded a provision for credit losses of $2.1 million for 2025 compared to $514,000 in 2024. For the year ended June 30, 2025, the Company recorded net charge offs of $1.4 million compared to no charge offs for the year ended June 30, 2024. Total non-performing assets were $2.2 million, or 0.23%, of total assets as of June 30, 2025, and $1.4 million, or 0.16% of total assets, as of June 30, 2024. ABOUT WINCHESTER BANCORP, INC. Winchester Bancorp, Inc. is a 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. NON-GAAP FINANCIAL MEASURES In addition to results presented in accordance with generally accepted accounting principles ("GAAP"), this press release contains certain non-GAAP financial measures, including net income excluding contribution to the charitable foundation, noninterest expense excluding contribution to the charitable foundation, earnings per share excluding contribution to the charitable foundation, return on average assets excluding contribution to the charitable foundation, return on average shareholders' equity excluding contribution to the charitable foundation, and efficiency ratio excluding contribution to the charitable foundation. The Company's management believes that the supplemental non-GAAP information is utilized by regulators and market analysts to evaluate a company's financial condition and therefore, such information is useful to investors. These disclosures should not be viewed as a substitute for financial results determined in accordance with GAAP performance measures that may be presented by other companies. Because non-GAAP financial measures are not standardized, it may not be possible to compare these financial measures with other companies' non-GAAP financial measures having the same or similar names. FORWARD-LOOKING STATEMENTS This press release contains forward-looking statements within the meaning of Section 21E of the Securities Exchange Act of 1934, which can be identified by the use of words such as "estimate," "project," "believe," "intend," "anticipate," "assume," "plan," "seek," "expect," "will," "may," "should," "indicate," "would," "contemplate," "continue," "target" and words of similar meaning. These forward-looking statements are based on our current beliefs and expectations and are inherently subject to significant business, economic and competitive uncertainties and contingencies, many of which are beyond our control. In addition, these forward-looking statements are subject to assumptions with respect to future business strategies and decisions that are subject to change. Certain factors that could cause actual results to differ materially from expected results include increased competitive pressures, demand for loan products, deposit flows, changes in the interest rate environment, the effects of inflation, general economic conditions (including potential recessionary conditions) or conditions within the securities markets, monetary and fiscal policies of the U.S. Government, including policies of the U.S. Treasury and the Board of Governors of the Federal Reserve Board; changes in the quality, size and composition of our loan and securities portfolios, changes in liquidity, including the size and composition of our deposit portfolio, and the percentage of uninsured deposits in the portfolio; changes in asset quality, prepayment speeds, charge-offs and/or credit loss provisions, our ability to access cost-effective funding; changes in demand for our products and services; legislative, accounting, tax and regulatory changes; the imposition of tariffs or other domestic or international governmental policies; the current or anticipated impact of military conflict, terrorism or other geopolitical events; a failure in or breach of our operational or security systems or infrastructure, including cyberattacks that could adversely affect the Company's financial condition and results of operations and the business in which the Company and the Bank are engaged, the failure to maintain current technologies and the failure to retain or attract employees. You should not place undue reliance on forward-looking statements. Winchester Bancorp, Inc. undertakes no obligation to revise these forward-looking statements or to reflect events or circumstances after the date of this press release. View source version on businesswire.com: https://www.businesswire.com/news/home/20250730891611/en/ Contacts Investor Contact John A. Carroll President and Chief Executive Officer [email protected] (781) 729-2130