FOR RELEASE

Date: July 23, 2026

For Further Information Contact:

Donald E. Gibson

President & CEO

(518) 943-2600

Nick Barzee

SVP & CFO

(518) 943-2600

Greene County Bancorp, Inc. Reports Record Fiscal Year 2026 Earnings, Achieves

Highest Quarterly Net Income in Company History, and Earns National Top-Performing Bank Recognition

Donald Gibson, President & CEO stated: “Fiscal 2026 was a truly exceptional year for Greene County Bancorp, Inc. We achieved record net income of $41.0 million, record quarterly earnings of $11.3 million, and reached all-time highs in both assets and net loans. These accomplishments reflect the strength of our relationship-based community banking model, the loyalty of our customers, and the dedication of our employees throughout the organization.

We are especially honored to be recognized by Bank Director Magazine’s RankingBanking report as one of the nation’s top-performing banks under $5.0 billion in assets. This recognition is particularly meaningful because it is based on key measures of profitability, asset quality, and capital strength-areas that have long been central to our operating philosophy.

As we look ahead, we remain committed to serving the individuals, businesses, municipalities, and communities that have contributed to our success. Our consistent performance, strong balance sheet, and disciplined growth strategy position us well to continue creating long-term value for our customers, shareholders, employees, and communities.”

Total consolidated assets for the Company were $3.2 billion at June 30, 2026, primarily consisting of $1.7 billion of net loans and $1.2 billion of total securities available-for-sale and held-to-maturity. Consolidated deposits totaled $2.7 billion at June 30, 2026, consisting of retail, business, municipal and private banking relationships.

Pre-provision net income was $43.1 million for the year ended June 30, 2026 as compared to $32.5 million for the year ended June 30, 2025, an increase of $10.6 million, or 32.7%. Pre-provision net income measures the Company’s net income not including the provision for credit losses. Management believes that this non-GAAP measure assists investors in comprehending the impact of the provision for credit losses on the Company’s reported results, offering an alternative view of the Company’s performance and the Company’s ability to generate income in excess of its provision for credit losses.

The Company strategically manages its balance sheet by focusing on higher-yielding loans and securities, and lowering deposit rates to align with the Federal Reserve’s interest rate cuts. This resulted in a higher net interest margin for the year ended June 30, 2026 as compared to the year ended June 30, 2025. Continued geopolitical disruptions, higher energy prices and shifting tariff policies complicate the economic outlook. With shifting global alliances and market volatility, our focus remains our commitment to building shareholder value while serving the financial needs of our communities. The Company continues to deliver strong performance and stability against an unpredictable geopolitical landscape.

Selected highlights for the quarter and fiscal year ended June 30, 2026, are as follows:

Average loan balances increased $123.4 million and $143.5 million and the yield on loans increased 7 and 13 basis points when comparing the three months and years ended June 30, 2026 and 2025, respectively. The average balance of securities increased $36.5 million and $72.8 million and the yield on such securities increased 29 and 26 basis points when comparing the three months and years ended June 30, 2026 and 2025, respectively. The average interest-bearing bank balances and federal funds decreased $25.1 million and $21.6 million and the yield on interest-bearing bank balances and federal funds decreased 84 and 71 basis points when comparing the three months and years ended June 30, 2026 and 2025, respectively.

The cost of NOW deposits decreased 38 and 36 basis points, the cost of certificates of deposits decreased 42 and 57 basis points and the cost of savings and money market deposits decreased 6 and 2 basis points when comparing the three months and years ended June 30, 2026 and 2025, respectively. The growth in interest-bearing liabilities was primarily due to an increase in average NOW deposits of $65.2 million and $124.5 million and an increase in average certificates of deposits of $21.1 million and $39.2 million when comparing the three months and years ended June 30, 2026 and 2025, respectively. This was partially offset by a decrease in average savings and money market deposits of $8.2 million and $12.6 million when comparing the three months and years ended June 30, 2026 and 2025, respectively. When comparing the three months and years ended June 30, 2026 and 2025, yields on interest-earning assets increased while the costs of interest-bearing deposits declined, reflecting continued asset repricing and the Company’s strategic reduction in deposit rates.

During the year ended June 30, 2026, the Company terminated its defined benefit pension plan, with all remaining obligations settled using plan assets for approximately $3.5 million.

Greene County Bancorp, Inc. is the holding company for the Bank of Greene County, and its subsidiary Greene County Commercial Bank. The Company is the leading provider of community-based banking services throughout the Hudson Valley and Capital Region of New York State. Its customers include individuals, businesses, municipalities and other institutions. Greene County Bancorp, Inc. (GCBC) is publicly traded on the Nasdaq Capital Market and is dedicated to promoting economic development and a high quality of life in the communities it serves. For more information on Greene County Bancorp, Inc., visit www.tbogc.com.

In addition to historical information, this earnings release may contain forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995, which describes the future plans, strategies and expectations of the Company. Forward-looking statements 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. 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. Accordingly, you should not place undue reliance on such statements. We are under no duty to and do not take any obligation to update any forward-looking statements after the date of this report. Factors which could have a material adverse effect on the operations of the Company and its subsidiaries include, but are not limited to, changes in general economic conditions, interest rates and inflation; changes in asset quality; our ability to access cost-effective funding; fluctuations in real estate values; changes in laws or regulations; the effects of any federal government shutdown; changes in liquidity, including the size and composition of our deposit portfolio and the percentage of uninsured deposits in the portfolio; changes in technology; failures or breaches of our IT security systems; our ability to introduce new products and services and capitalize on growth opportunities; changes in accounting policies and practices; our ability to retain key employees; and the effects of natural disasters and geopolitical events, including terrorism, conflict and acts of war.

For more information, please see our reports filed with the United States Securities and Exchange Commission (“SEC”), including our most recent annual report on Form 10-K and quarterly reports on Form 10-Q.

In addition to presenting information in conformity with accounting principles generally accepted in the United States of America (GAAP), this news release contains financial information determined by methods other than GAAP (non-GAAP). The following measures used in this release, which are commonly utilized by financial institutions, have not been specifically exempted by the Securities and Exchange Commission ("SEC") and may constitute "non-GAAP financial measures" within the meaning of the SEC's rules.

The Company has provided in this news release supplemental disclosures for the calculation of net interest margin utilizing a fully taxable-equivalent adjustment and pre-provision net income. Management believes that the non-GAAP financial measures disclosed by the Company from time to time are useful in evaluating the Company's performance and that such information should be considered as supplemental in nature and not as a substitute for or superior to the related financial information prepared in accordance with GAAP. Our non-GAAP financial measures may differ from similar measures presented by other companies. Refer to the tables on page 9 for Non-GAAP to GAAP reconciliations.

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Greene County Bancorp, Inc.

Consolidated Statements of Income and Selected Financial Ratios (Unaudited)

⁽¹⁾ Ratios are annualized when necessary.

⁽²⁾ Interest income calculated on a taxable-equivalent basis (non-GAAP) includes the additional interest income that would have been earned if the Company’s investment in tax-exempt securities and loans had been subject to federal and New York State income taxes yielding the same after-tax income.

⁽³⁾ The efficiency ratio has been calculated as noninterest expense divided by the sum of net interest income and noninterest income.

⁽⁴⁾ The dividend payout ratio has been calculated based on the dividends declared per share divided by basic earnings per share. No adjustments have been made to account for dividends waived by Greene County Bancorp, MHC (“MHC”), the Company’s majority shareholder, owning 54.1% of the shares outstanding.

⁽⁵⁾ Dividends declared divided by net income. The MHC waived its right to receive dividends declared during the three months ended March 31, 2025, June 30, 2025, September 30, 2025, December 31, 2025, and June 30, 2026. Dividends declared during the three months ended September 30, 2024, December 31, 2024, and March 31, 2026, were paid to the MHC.

Greene County Bancorp, Inc.

Consolidated Statements of Financial Condition (Unaudited)

The above information is preliminary and based on the Company’s data available at the time of presentation.

The following table summarizes the adjustments made to arrive at the fully taxable-equivalent net interest margins.

 ⁽¹⁾ Interest income calculated on a taxable-equivalent basis (non-GAAP) includes the additional interest income that would have been earned if the Company’s investment in tax-exempt securities and loans had been subject to federal and New York State income taxes yielding the same after-tax income. The rate used for this adjustment was 21% for federal income taxes for the three and twelve months ended June 30, 2026 and 2025, 4.44% for New York State income taxes for the three and twelve months ended June 30, 2026 and 2025.

The following table summarizes the adjustments made to arrive at pre-provision net income.

The above information is preliminary and based on the Company’s data available at the time of presentation.

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