GREENE COUNTY BANCORP INC

Notes to Unaudited Consolidated Financial Statements

At and for the Three Months Ended September 30, 2026 and 2025

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Summary of Significant Accounting Policies

Principles of Consolidation and Basis of Presentation

Within the accompanying unaudited interim consolidated financial statements and related notes to the consolidated financial statements, the June 30, 2026 data was derived from the audited consolidated financial statements and notes of Greene County Bancorp, Inc. (the “Company”) and its wholly owned subsidiaries, Bank of Greene (formerly the Bank of Greene County) (the “Bank”) and the Bank’s wholly owned subsidiaries, Greene County Commercial Bank (the “Commercial Bank”) and Greene Property Holdings, Ltd. The interim consolidated financial statements at and for the three months ended September 30, 2026 and 2025 are unaudited.

The unaudited interim consolidated financial statements include the accounts of certain Variable Interest Entities (“VIE(s)”). In accordance with the applicable accounting guidance for consolidations, the Company consolidates a VIE if it has (i) a variable interest in the entity; (ii) the power to direct activities of the VIE that most significantly affect the entity’s economic performance; and (iii) the obligation to absorb losses of the entity or the right to receive benefits from the entity that could potentially be significant to the VIE (i.e., we are considered to be the primary beneficiary).

The Company uses the equity method to account for unconsolidated investments in VIEs if it has significant influence over the entity’s operating and financing decision. Unconsolidated investments in VIEs in which the Company does not have significant influence, are carried at a cost measurement alternative. See Note 14, Variable Interest Entities for information on our involvement with VIEs.

The financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 8 of Regulation S-X. Accordingly, they do not include all the information and notes required by GAAP for complete financial statements. To the extent that information and notes required by GAAP, for complete financial statements, are contained in or are consistent with the audited financial statements incorporated by reference to Greene County Bancorp, Inc.’s Annual Report on Form 10-K for the year ended June 30, 2026, such information and notes have not been duplicated herein. In the opinion of management, all adjustments (consisting of only normal recurring items) necessary for a fair presentation of the financial position and results of operations and cash flows at and for the periods presented have been included. Certain previous years’ amounts in the unaudited consolidated financial statements and notes thereto, have been reclassified to conform to the current year’s presentation. All material inter-company accounts and transactions have been eliminated in consolidation. The results of operations and other data for the three months ended September 30, 2026, are not necessarily indicative of results that may be expected for the entire fiscal year ending June 30, 2027. These consolidated financial statements consider events that occurred through the date the consolidated financial statements were issued and should be read in conjunction with the audited consolidated financial statements and notes included in the Company’s Annual Report on Form 10-K.

Nature of Operations

The Company’s primary business is the ownership and operation of its subsidiaries. At September 30, 2026, the Company operated 19 full-service banking offices, lending centers, an operations center, customer call center, administration center, and a wealth management center, located in its market area consisting of the Hudson Valley and Capital District Regions of New York State. The Bank is primarily engaged in the business of attracting deposits from the general public in the Bank’s market area, and investing such deposits, together with other sources of funds, in loans and investment securities. The Commercial Bank’s primary business is to attract deposits from and provide banking services to local municipalities. Greene Property Holdings, Ltd. was formed as a New York corporation that has elected under the Internal Revenue Code to be a real estate investment trust. Currently, certain mortgages and loan notes held by the Bank are transferred and beneficially owned by Greene Property Holdings, Ltd. The Bank continues to service these loans.

Effective September 14, 2026, the Company’s primary banking subsidiary changed its legal name from the Bank of Greene County to Bank of Greene. The name change had no impact on the Bank’s operations and had no impact on the Company’s consolidated financial statements.

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Use of Estimates

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosure of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. Actual results could materially differ from those estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for credit losses (“ACL”) on loans and on unfunded commitments.

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Recent Accounting Pronouncements

Accounting Standards Issued Not Yet Adopted

In October 2023, the FASB issued ASU 2023-06, Disclosure Improvements, which amends the disclosure or presentation requirements related to various subtopics in the FASB Accounting Standards Codification. The ASU was issued in response to the SEC’s August 2018 final rule that updated and simplified disclosure requirements that the SEC believed were redundant, duplicative, overlapping, outdated, or superseded. The new guidance is intended to align GAAP requirements with those of the SEC. The ASU will become effective on the earlier of the date on which the SEC removes its disclosure requirements for the related disclosure or June 30, 2027. Early adoption is not permitted. The adoption is not expected to have a material impact on the consolidated financial statements.

In November 2024, the FASB issued ASU 2024-03, Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosure (Subtopic 220-40), which will require enhanced disaggregation of certain expense categories in the notes to the financial statements. The disclosure will require disaggregation of certain income statement expenses including employee compensation, depreciation and intangible asset amortization. The ASU is effective for annual reporting periods beginning after December 15, 2026, and early adoption is permitted. The Company’s adoption of this standard is not expected to have a material impact on the consolidated financial statements.

In December 2025, the FASB issued ASU 2025-11, Interim Reporting (Topic 270), Narrow-Scope Improvements, which clarifies the interim reporting requirements by improving navigability and more clearly specifying what disclosures are required in an interim reporting period applicable to Topic 270. The ASU is effective for annual reporting periods beginning after December 15, 2027, and early adoption is permitted. The Company’s adoption of this standard is not expected to have a material impact on the consolidated financial statements.

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Securities

The following tables summarize the amortized cost and fair value of securities available-for-sale by major type:

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There wasno allowance for credit losses on securities available-for-sale as of the quarter ended September 30, 2026 and June 30, 2026, as each of the securities in the portfolio are investment grade, current as to principal and interest, and their price changes are consistent with interest and credit spreads when adjusting for convexity, rating, and industry differences.

The following tables summarize the amortized cost, fair value, and allowance for credit loss on securities held-to-maturity by major type:

U.S. Treasury and mortgage-backed securities are issued by U.S. government entities and agencies. These securities are either explicitly and/or implicitly guaranteed by the U.S. government as to timely repayment of principal and interest, are highly rated by major rating agencies, and have a long history of zero credit losses. Therefore, the Company determined a zero credit loss assumption and did not calculate or record an allowance for credit loss for these securities. An allowance for credit losses on investment securities held-to-maturity has been recorded for certain municipal securities issued by state and political subdivisions and corporate debt securities to account for expected lifetime credit loss using the Current Expected Credited Losses (“CECL”) methodology.

The Company’s current policies generally limit securities investments to U.S. government and securities of government sponsored enterprises, federal funds sold, municipal bonds, corporate debt obligations, subordinated debt of banks and certain mutual funds. In addition, the Company’s policies permit investments in mortgage-backed securities, including securities issued and guaranteed by Fannie Mae, Freddie Mac, and Government National Mortgage Association (“GNMA”), and collateralized mortgage obligations issued by these entities. The Company’s investments in state and political subdivisions securities generally are municipal obligations that are general obligations supported by the taxing authority of the issuer, and in some cases are insured. The obligations issued by school districts are supported by state aid. Primarily, these investments are issued by municipalities within New York State.

The Company’s current securities investment strategy utilizes a risk management approach of diversified investing among three categories: short-, intermediate- and long-term. The emphasis of this approach is to increase overall securities investment yield while managing interest rate risk. The Company will only invest in high-quality securities, as determined by management’s analysis at the time of purchase. The Company generally does not engage in any balance sheet derivative or hedging investment transactions, such as balance sheet interest rate swaps or caps.

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The following table summarizes the activity in the allowance for credit losses on securities held-to-maturity:

The following table shows fair value and gross unrealized losses, aggregated by security category and length of time that individual securities have been in a continuous unrealized loss position, at September 30, 2026.

The following table shows fair value and gross unrealized losses, aggregated by security category and length of time that individual securities have been in a continuous unrealized loss position, at June 30, 2026.

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There wereno transfers of securities available-for-sale to held-to-maturity during the three months ended September 30, 2026 and 2025.

During the three months ended September 30, 2026, a loss of $1.2 million was recognized from a sale oftwo securities available-for-sale with a total par value of $8.5 million. The proceeds were used to fund higher yielding investments. During the three months ended September 30, 2025, there wereno sales of securities andno gains or losses were recognized.

The estimated fair values of debt securities at September 30, 2026, by contractual maturity are shown below. Expected maturities may differ from contractual maturities, because issuers may have the right to call or prepay obligations with or without call or prepayment penalties.

As of September 30, 2026 and June 30, 2026, securities with an aggregate fair value of $1.1 billion were pledged as collateral for deposits in excess of FDIC insurance limits for various municipalities placing deposits with the Commercial Bank. As of September 30, 2026 and June 30, 2026, securities with an aggregate fair value of $15.8 million were pledged as collateral for potential borrowings at the Federal Reserve Bank discount window. The Company did not participate in any securities lending programs during the three months ended September 30, 2026 or 2025.

Federal Home Loan Bank Stock

Federal law requires a member institution of the Federal Home Loan Bank (“FHLB”) system to hold stock of its district FHLB according to a predetermined formula. This stock is restricted in that it can only be sold to the FHLB or to another member institution, and all sales of FHLB stock must be at par. As a result of these restrictions, FHLB stock is carried at cost. FHLB stock is held as a long-term investment and its value is determined based on the ultimate recoverability of the par value. Impairment of this investment is evaluated quarterly and is a matter of judgment that reflects management’s view of the FHLB’s long-term performance, which includes factors such as the following: its operating performance; the severity and duration of declines in the fair value of its net assets related to its capital stock amount; its commitment to make payments required by law or regulation and the level of such payments in relation to its operating performance; the impact of legislative and regulatory changes on the FHLB, and accordingly, on the members of the FHLB; and its liquidity and funding position.

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Loans and Allowance for Credit Losses on Loans

Loan segments are summarized below as of the dates indicated:

Non-accrual Loans

Management places loans on non-accrual status once the loans have become 90 days or more delinquent. A non-accrual loan is defined as a loan in which collectability is questionable and therefore interest on the loan will no longer be recognized on an accrual basis. A loan is not placed back on accrual status until the borrower has demonstrated the ability and willingness to make timely payments on the loan. A loan does not have to be 90 days delinquent in order to be classified as non-accrual. Loans on non-accrual status totaled $3.2 million at September 30, 2026, of which there weretwo residential real estate loans totaling $189,000 in the process of foreclosure. Included in non-accrual loans were $2.0 million of loans which were less than 90 days past due at September 30, 2026, but have a recent history of delinquency greater than 90 days past due. These loans will be returned to accrual status once they have demonstrated a history of timely payments. Loans on non-accrual status totaled $3.9 million at June 30, 2026, of which there were four residential real estate loans totaling $745,000 in the process of foreclosure. Included in non-accrual loans were $1.7 million of loans which were less than 90 days past due at June 30, 2026, but have a recent history of delinquency greater than 90 days past due. The activity in nonperforming loans during the three months ended September 30, 2026 included $1.2 million in loan repayments, $163,000 in loans returning to performing status, $91,000 in charge-offs or transfers to foreclosure, and $720,000 of loans placed into nonperforming status.

The following table sets forth information regarding delinquent and/or non-accrual loans as of September 30, 2026:

The following table sets forth information regarding delinquent and/or non-accrual loans as of June 30, 2026:

The Company hadno accruing loans delinquent 90 days or more at September 30, 2026 and June 30, 2026.

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Allowance for Credit Losses on Loans

The allowance for credit losses for the loan portfolio is established through a provision for credit losses based on the results of life of loan quantitative models, reserves associated with collateral-dependent loans individually evaluated and adjustments for the impact of current economic conditions not accounted for in the quantitative models. The discounted cash flow methodology is used to calculate the ACL on loans for the residential real estate, commercial real estate, home equity and commercial loan segments. The Company uses a four-quarter reasonable and supportable forecast period based on the one-year percent change in national gross domestic product and the national unemployment rate, as economic variables. The forecast will revert to long-term economic conditions over a four-quarter reversion period on a straight-line basis. The remaining life method will be utilized to determine the ACL for the consumer loan segment. A qualitative factor framework has been developed to adjust the quantitative loss rates for asset-specific risk characteristics or current conditions at the reporting date. The Company elected to use the practical expedient to evaluate loans individually, if they are collateral dependent loans that are on non-accrual status with a balance of $250,000 or greater, which is consistent with regulatory requirements. The fair value of the collateral dependent loan less selling expenses will be compared to the loan balance to determine if an ACL on loans is required. While management uses available information to recognize losses on loans, additions or reductions to the allowance may fluctuate from one reporting period to another. These fluctuations are reflective of changes in the reasonable and supportable forecast, analysis of loans individually evaluated, and/or changes in management’s assessment of the qualitative factors.

In addition, various regulatory agencies, as an integral part of their examination process, periodically review the Company’s allowance for credit losses. Such agencies may require the Company to recognize additions to the allowance based on their judgment about information available to them at the time of their examination. The Company charges loans off against the allowance for credit losses when it becomes evident that a loan cannot be collected within a reasonable amount of time, or that it will cost the Company more than it will receive and all possible avenues of repayment have been analyzed, including the potential of future cash flow, the value of the underlying collateral, and strength of any guarantors or co-borrowers. Generally, consumer loans and smaller business loans (not secured by real estate) in excess of 90 days are charged-off against the allowance for credit losses, unless equitable arrangements are made. Included within consumer loan charge-offs and recoveries are deposit accounts that have been overdrawn in excess of 60 days. For loans secured by real estate, a charge-off is recorded when it is determined that the collection of all or a portion of a loan may not be collected and the amount of that loss can be reasonably estimated. The allowance for credit losses is increased by a provision for credit losses (which results in a charge to expense), and recoveries of loans previously charged off and is reduced by charge-offs.

The following tables set forth the activity and allocation of the allowance for credit losses on loans by segment:

Credit monitoring process

Management closely monitors the quality of the loan portfolio and has established a loan review process designed to help monitor any change in borrower risk during the life cycle of their loan. The Company utilizes a credit quality grading system that is used at loan inception and updated as appropriate based on an annual review process. The credit quality grade helps management make a consistent assessment of each loan relationship’s credit risk and identify any portfolio trends that could impact profitability. Consistent with regulatory guidelines, the Company provides for the classification of loans, such as “Pass,” “Special Mention,” “Substandard,” “Doubtful” and “Loss” classifications.

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Commercial grading system

Loss

Loss ratings are loans that are considered uncollectible and of such little value that their continuance as active assets of the Company is not warranted. Loss rating does not necessarily mean that the loan has no recovery or salvage value, however, it is not practical or desirable to defer charging off the loan.

Doubtful

Doubtful ratings are loans that have all the weakness inherent in loans classified as substandard with the added characteristic that the weaknesses present make collection or liquidation in full, on the basis of currently existing facts, highly questionable and improbable. Doubtful ratings generally are non-performing and considered to have a high risk of default.

Substandard

Substandard ratings are loans that possess well-defined weaknesses that jeopardize the orderly liquidation of debt and are characterized by the distinct possibility that the Company will sustain some loss, if the deficiencies are not corrected. Substandard ratings are inadequately protected by the current sound worth and paying capacity of the borrower or the collateral pledged, if any.

Special mention

Special mention ratings are loans that have potential weaknesses or emerging problems which require close attention. These weaknesses, if left uncorrected, could lead to deterioration in the repayment prospects for the loan or the Company’s collateral position in the future. Special mention loans are less risky than substandard assets as no loss of principal or interest is anticipated, unless the potential problems continue for a prolonged basis.

Pass

Pass ratings are loans that do not encompass loans graded as Loss, Doubtful, Substandard, or Special mention. Pass loans range from Pass/Watch, Acceptable, Average, Satisfactory, Good and Excellent. Pass loans demonstrate sufficient cash flow to ensure full repayment of the loan, with Pass ratings being determined by the quality of the collateral and equity position, stability of operations or management, and the guarantors.

Residential and consumer grading system

Residential real estate, home equity and consumer loans are graded as either non-performing or performing.

Non-performing

Non-performing loans are loans in which the borrower has not made the scheduled payments of principal or interest, and are generally loans over 90 days past due, and loans on non-accrual status.

Performing

Performing loans are those loans in which the borrower is making timely payments of both principal and interest as upon the agreed loan terms.

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The following tables present the amortized cost basis of the Company’s loans by class and vintage and includes gross charge-offs by loan class and vintage as of the three months ended September 30, 2026:

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The following tables present the amortized cost basis of the Company’s loans by class and vintage and includes gross charge-offs by loan class and vintage as of the twelve months ended June 30, 2026:

The Company hadno loans classified doubtful or loss at September 30, 2026 or June 30, 2026. Management continues to monitor classified loan relationships closely.

Allowance for Credit Losses on Unfunded Commitments

The Company estimates expected credit losses over the contractual period in which the Company has exposure to a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by the Company. The allowance for credit losses on unfunded commitments exposure is recognized in accrued expenses and other liabilities, with adjustments as an expense in other noninterest expense. At September 30, 2026, the allowance for credit losses on unfunded commitments totaled $1.6 million as compared to $1.4 million at June 30, 2026.

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Individually Evaluated Loans

Loans individually evaluated had an amortized cost basis of $1.7 million and $1.6 million, with an allowance for credit losses on loans of $123,000 and $466,000 at September 30, 2026 and June 30, 2026, respectively. At September 30, 2026, the amortized cost basis of collateral dependent loans was $1.2 million for residential real estate loans, $299,000 for commercial real estate loans, and $167,000 for home equity loans. At June 30, 2026, the amortized cost basis of collateral dependent loans was $1.4 million for residential real estate loans and $170,000 for home equity loans. The allowance for credit loss for collateral dependent loans is individually assessed based on the fair value of the collateral less costs to sell at the reporting date.

Loan Modifications to Borrowers Experiencing Financial Difficulties

When the Company modifies a loan for borrowers experiencing financial difficulty, such modifications generally include one or a combination of the following: an extension of the maturity date; a stated rate of interest not at the market rate for new debt with similar risk; a change in the scheduled payment amount; or principal forgiveness. The Company works with loan customers experiencing financial difficulty and may enter into loan modifications to achieve the best mutual outcome given the financial circumstances of the borrower.

The following table present the amortized cost basis of the loans modified to borrowers experiencing financial difficulty by type of concession granted at the dates indicated:

There wereno loans during the three months ended September 30, 2026 that were modified to borrowers experiencing financial difficulty.

The following table presents the financial effect of the modifications made to borrowers experiencing financial difficulty:

There wasone commercial real estate loan that had been modified in the form of a term extension with a borrower experiencing financial difficulty in the prior twelve months ended September 30, 2026, that had a payment default during the twelve months ended September 30, 2026.

There were no loans that had been modified with borrowers experiencing financial difficulty in the prior twelve months ended September 30, 2025, that had a payment default during the three months ended September 30, 2025.

The Company closely monitors the performance of loans that have been modified. The following table depicts the performance of loans that have been modified to borrowers experiencing financial difficulty that were modified in the prior twelve months at amortized cost basis:

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Foreclosed real estate

Foreclosed real estate (“FRE”) consists of properties acquired through mortgage loan foreclosure proceedings, deed in lieu of foreclosure or in full or partial satisfaction of loans. The following table sets forth information regarding FRE at:

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Fair Value Measurements and Fair Value of Financial Instruments

Management uses its best judgment in estimating the fair value of the Company’s financial instruments; however, there are inherent weaknesses in any estimation technique. Therefore, for substantially all financial instruments, the fair value estimates herein are not necessarily indicative of the amounts the Company could have realized in a sale transaction on the dates indicated. The estimated fair value amounts have been measured as of September 30, 2026 and June 30, 2026 and have not been re-evaluated or updated for purposes of these consolidated financial statements subsequent to those respective dates. As such, the estimated fair values of these financial instruments subsequent to the respective reporting dates may be different from the amounts reported at each period-end.

The following information should not be interpreted as an estimate of the fair value of the entire Company since a fair value calculation is only provided for a limited portion of the Company’s assets and liabilities. Due to a wide range of valuation techniques and the degree of subjectivity used in making the estimates, comparisons between the Company’s disclosures and those of other companies may not be meaningful.

The FASB ASC Topic 820 on “Fair Value Measurement” established a fair value hierarchy that prioritized the inputs to valuation techniques used to measure fair value. The fair value is an exit price, representing the amount that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants. Fair value measurements are not adjusted for transaction costs. A fair value hierarchy exists within GAAP that prioritizes the inputs to valuation techniques used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are as follows:

Level 1: Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.

Level 2: Quoted prices for similar assets or liabilities in active markets, quoted prices in markets that are not active, or inputs that are observable either directly or indirectly, for substantially the full term of the asset or liability.

Level 3: Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported with little or no market activity).

An asset’s or liability’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement.

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For assets and liabilities measured at fair value on a recurring basis, the fair value measurements by level within the fair value hierarchy used are as follows:

Certain investments that are actively traded and have quoted market prices have been classified as Level 1 valuations. Other investment securities available-for-sale have been valued by reference to prices for similar securities or through model-based techniques in which all significant inputs are observable, and therefore, such valuations have been classified as Level 2.

In addition to disclosures of the fair value of assets on a recurring basis, FASB ASC Topic 820 on “Fair Value Measurement” requires disclosures for assets and liabilities measured at fair value on a nonrecurring basis, such as loans individually evaluated for expected credit losses in the period in which a re-measurement at fair value is performed. The Company uses the fair value of underlying collateral, less costs to sell, to estimate the allowance for credit losses for individually evaluated loans. Management may modify the appraised values, for qualitative factors such as economic conditions and estimated liquidation expenses ranging from 21.3% to 63.7%. Such modifications to the appraised values could result in lower valuations of such collateral. Based on the valuation techniques used, the fair value measurements for loans evaluated individually are classified as Level 3.

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Fair values for foreclosed real estate are initially recorded at the estimated fair value of the property less estimated costs to dispose at the time of acquisition to establish a new carrying value. Values are derived from appraisals, similar to loans individually evaluated for expected credit loss, of underlying collateral. Any write downs from the carrying value of the loan to estimated fair value, which are required at the time of foreclosure, are charged to the allowance for credit losses. Subsequent adjustments to the carrying value of such properties resulting from declines in fair value result in the establishment of a valuation allowance and are charged to operations in the period in which the declines occur. In the determination of fair value subsequent to foreclosure, management may modify the appraised values, for qualitative factors such as economic conditions and estimated liquidation expenses. Such modifications to the appraised values could result in lower valuations of such collateral. Based on the valuation techniques used, the fair value measurements for foreclosed real estate are classified as Level 3.

No other financial assets or liabilities were re-measured during the three month period on a nonrecurring basis.

The carrying amounts reported in the statements of financial condition for total cash and cash equivalents, long-term certificates of deposit, accrued interest receivable and accrued interest payable approximate their fair values. Fair values of securities are based on quoted market prices (Level 1), where available, or matrix pricing (Level 2), which is a mathematical technique, used widely in the industry to value debt securities without relying exclusively on quoted market prices for the specific securities but rather by relying on the securities’ relationship to other benchmark quoted prices. The carrying amount of Federal Home Loan Bank stock approximates fair value due to its restricted nature. The fair values for loans are measured using the "exit price" notion which is a reasonable estimate of what another party might pay in an orderly transaction. Fair values for variable rate loans that reprice frequently, with no significant credit risk, are based on carrying value. Fair values for fixed rate loans are estimated using discounted cash flows and interest rates currently being offered for loans with similar terms to borrowers of similar credit quality. Fair values disclosed for demand and savings deposits are equal to carrying amounts at the reporting date. The carrying amounts for variable rate money market deposits approximate fair values at the reporting date. Fair values for long- term certificates of deposit are estimated using discounted cash flows and interest rates currently being offered in the market on similar certificates. Fair value for Federal Home Loan Bank long-term borrowings are estimated using discounted cash flows and interest rates currently being offered on similar borrowings. The carrying value of short-term Federal Home Loan Bank borrowings approximates its fair value. Fair value for subordinated notes payable is estimated based on a discounted cash flow methodology or observations of recent highly-similar transactions. Fair value for interest rate swaps include any accrued interest and are valued using the present value of cash flows discounted using observable forward rate assumptions. The Company has determined that the majority of the inputs used to value its derivatives fall within Level 2 of the fair value hierarchy.

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The carrying amounts and estimated fair value of financial instruments are as follows:

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Derivative Instruments

The Company is exposed to certain risks arising from both its business operations and economic conditions. The Company principally manages its exposures to a wide variety of business and operational risks through management of its core business activities. The Company manages economic risks, including interest rate, primarily by managing the amount, sources and duration of its assets and liabilities. The Company has interest rate derivatives that result from a service provided to certain qualifying customers, and therefore, are not used to manage interest rate risk in the Company’s assets or liabilities. The Company manages a matched book with respect to its derivative instruments in order to minimize its net risk exposure resulting from such transactions.

Derivatives Not Designated as Hedging Instruments

The Company enters into interest rate swap agreements with its commercial customers to provide them with a long-term fixed rate, while simultaneously entering into offsetting interest rate swap agreements with a counterparty to swap the fixed rate to a variable rate to manage interest rate exposure. These interest rate swap agreements are not designated as hedges for accounting purposes. As the interest rate swap agreements have substantially equivalent and offsetting terms, they do not present any material exposure to the Company’s consolidated statements of income. The Company records its interest rate swap agreements at fair value and are presented within other assets and other liabilities on the consolidated statements of financial condition. Changes in the fair value of assets and liabilities arising from these derivatives are included net, in other operating income in the consolidated statements of income. Under terms of the agreements with the third-party counterparties, the Company provides cash collateral to the counterparty, when required, for the initial trade. Subsequent to the trade, the margin is exchanged in either direction based upon the estimated fair value of the underlying contracts. Cash collateral represents the amount that is exchanged under master netting agreements that allows the Company to offset the derivative position with the related collateral. The notional amount of the interest rate swaps does not represent amounts exchanged by the parties. The amount exchanged is determined by reference to the notional amount and the other terms of the individual interest rate swap agreements.

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The following tables present the notional amount and fair values of interest rate derivative positions:

Risk Participation Agreements

Risk participation agreements (“RPAs”) are guarantees issued by the Company to other parties for a fee, whereby the Company agrees to participate in the credit risk of a derivative customer of the other party. Under the terms of these agreements, the “participating bank” receives a fee from the “lead bank” in exchange for the guarantee of reimbursement if the customer defaults on an interest rate swap. The interest rate swap is transacted such that any and all exchanges of interest payments (favorable and unfavorable) are made between the lead bank and the customer. In the event that an early termination of the swap occurs and the customer is unable to make a required close out payment, the participating bank assumes that obligation and is required to make this payment.

RPAs in which the Company acts as the lead bank are referred to as “participations-out,” in reference to the credit risk associated with the customer derivatives being transferred out of the Company. Participations-out generally occur concurrently with the sale of new customer derivatives. The RPAs participations-out are spread out over three financial institution counterparties and terms range betweentwo toeight years. The Company’s credit exposure transferred out was $868,000 and $39,000 as of September 30, 2026 and June 30, 2026, respectively. The Company transferred out RPAs with a notional amount of $22.3 million for both September 30, 2026 and June 30, 2026, respectively.

RPAs where the Company acts as the participating bank are referred to as “participations-in,” in reference to the credit risk associated with the counterparty’s derivatives being assumed by the Company. The Company’s maximum credit exposure is based on its proportionate share of the settlement amount of the referenced interest rate swap. Settlement amounts are generally calculated based on the fair value of the swap plus outstanding accrued interest receivables from the customer. The RPAs participations-ins are spread out over five financial institution counterparties and terms range betweenone toten years. The credit exposure associated with risk participations-ins was $9.9 million and $231,000 as of September 30, 2026 and June 30, 2026, respectively. The Company held RPAs with a notional amount of $143.8 million and $152.4 million as of September 30, 2026 and June 30, 2026, respectively.

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Earnings Per Share

Basic earnings per share (“EPS”) is computed by dividing net income available to common shareholders by the weighted average number of common shares outstanding during the period. Diluted EPS is computed in a manner similar to that of basic EPS except that the weighted-average number of common shares outstanding is increased to reflect the effect of potentially dilutive common shares, such as stock options, using the treasury stock method, assuming such shares vested during the period. Unallocated common shares held by the ESOP are not included in the weighted-average number of common shares outstanding for either the basic or diluted EPS calculations. There wereno dilutive or anti-dilutive securities or contracts outstanding during the three months ended September 30, 2026 and 2025.

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Dividends

On July 22, 2026, the Company announced that its Board of Directors approved a quarterly cash dividend of $0.11 per share on the Company’s common stock. The dividend reflects an annual cash dividend rate of $0.44 per share, which represents a 10.0% increase from the previous annual cash dividend of $0.40 per share. The dividend was payable to stockholders of record as of August 14, 2026, and was paid on August 31, 2026. Greene County Bancorp, MHC waived its right to receive this dividend.

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Employee Benefit Plans

SERP

The Board of Directors of Bank of Greene adopted The Bank of Greene County Supplemental Executive Retirement Plan (the “SERP”), effective as of July 1, 2010. The SERP benefits certain key senior executives of the Bank who have been selected by the Board to participate. The SERP is intended to provide a benefit from the Bank upon vested retirement, death or disability, or voluntary or involuntary termination of service (other than “for cause”). The SERP is more fully described in Note 9, Employee Benefits Plans of the consolidated financial statements presented in our Annual Report on Form 10-K for the fiscal year ended June 30, 2026.

The net periodic pension costs related to the SERP was $596,000 and $549,000 for the three months ended September 30, 2026 and 2025, respectively, consisting primarily of service and interest costs, included within salaries and employee benefits expense on the consolidated statements of income. The total liability for the SERP was $21.1 million at September 30, 2026, and $20.3 million at June 30, 2026, and is included in accrued expenses and other liabilities on the consolidated statements of financial condition. The total liability for the SERP includes both accumulated net periodic pension costs and participant contributions.

(10)

Stock-Based Compensation

Phantom Stock Option Plan and Long-term Incentive Plan

The Greene County Bancorp, Inc. 2011 Phantom Stock Option and Long-term Incentive Plan (the “Plan”) was adopted effective July 1, 2011, to promote the long-term financial success of the Company and its subsidiaries by providing a means to attract, retain and reward individuals who contribute to such success, and to further align their interests with those of the Company’s shareholders. The Plan is intended to provide benefits to employees and directors of the Company or any subsidiary as designated by the Compensation Committee of the Board of Directors of the Company. A phantom stock option represents the right to receive a cash payment on the date the award vests. The Plan is more fully described in Note 10, Stock-Based Compensation of the consolidated financial statements presented in our Annual Report on Form 10-K for the fiscal year ended June 30, 2026.

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A summary of the Company’s phantom stock option activity and related information for the Plan for the three months ended September 30, 2026 and 2025 were as follows:

The total liability for the long-term incentive plan was $5.8 million and $4.9 million at September 30, 2026 and June 30, 2026, respectively, and is included in accrued expenses and other liabilities on the consolidated statements of financial condition.

(11)

Accumulated Other Comprehensive Loss

The components of accumulated other comprehensive loss are presented as follows:

Activity for the three months ended September 30, 2026 and 2025

(12)

Operating leases

The Company leases certain branch properties under long-term operating lease agreements. The Company’s operating lease agreements contain non-lease components, which are generally accounted for separately. The Company’s lease agreements do not contain any residual value guarantees.

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The following includes quantitative data related to the Company’s operating leases at September 30, 2026 and June 30, 2026, and for the three months ended September 30, 2026 and 2025:

The following is a schedule by year of the undiscounted cash flows of the operating lease liabilities, excluding common area maintenance charges and real estate taxes as of September 30, 2026:

Right-of-use assets are included inprepaid expenses and other assets, and lease liabilities are included inaccrued expenses and other liabilities within the Company’s consolidated statements of financial condition.

(13)

Commitments and Contingent Liabilities

Credit-Related Financial Instruments

In the normal course of business, the Company offers financial instruments with off-balance sheet risk to meet the financing needs of its customers. These transactions include commitments to extend credit, standby letters of credit, and lines of credit, which involve to varying degrees elements of credit risk, which are not reflected in the accompanying consolidated financial statements.

The Company’s unfunded loan commitments and unused lines of credit are as follows at September 30, 2026 and June 30, 2026:

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The Company enters into contractual commitments to extend credit to its customers in the form of loan commitments and lines of credit, generally with fixed expiration dates and other termination clauses, and may require payment of a fee. Substantially all of the Company's commitments to extend credit are contingent upon its customers maintaining specific credit standards at the time of loan funding and are often secured by real estate collateral. Since the majority of the Company's commitments typically expire without being funded, the total contractual amount does not necessarily represent the Company's future payment requirements.

The Company evaluates each customer’s credit worthiness on a case-by-case basis. The amount of collateral, if any, required upon an extension of credit is based on management’s evaluation of customer credit. Commitments to extend mortgage credit are primarily collateralized by first liens on real estate. Collateral on extensions of commercial lines of credit vary but may include accounts receivable, inventory, property plant and equipment, and income producing commercial property.

Allowance for Credit Losses on Unfunded Commitments

The Company estimates expected credit losses over the contractual period in which the Company has exposure to a contractual obligation to extend credit, unless that obligation is unconditionally cancellable by the Company. The allowance for credit losses on unfunded commitments exposure is recognized in accrued expenses and other liabilities and is adjusted through a provision expense in other noninterest expense. At September 30, 2026, the allowance for credit losses on unfunded commitments totaled $1.6 million as compared to $1.4 million at June 30, 2026.

(14)

Variable Interest Entities

Solar Tax Credit Investments

The Company makes non-marketable equity investments in entities that sponsor solar development projects that qualify for the Solar Tax Credit Program. The purpose of these investments is to assist the Company in meeting its responsibilities under the Community Reinvestment Act (“CRA”), and to provide a return, primarily through the realization of tax benefits. The Company does not have controlling interest and is not the primary beneficiary of the solar tax credit investments, therefore the entity is not consolidated. The Company has determined that it is not the primary beneficiary due to its inability to direct activities that most significantly impact economic performance. The Company applies the proportional amortization method to subsequently measure its investment in solar tax credit projects.

The following table summarizes the Company’s solar tax credit investments and related unfunded commitments:

The aggregate carrying value of the Company’s solar tax credit investments is included in prepaid expenses and other assets within the Company’s consolidated statements of financial condition and represents the Company’s maximum exposure to loss.

(15)

Subsequent events

On October 21, 2026, the Board of Directors announced a cash dividend for the quarter ended September 30, 2026, of $0.11 per share on the Company’s common stock. The dividend reflects an annual cash dividend rate of $0.44 per share, which was the same rate as the dividend declared during the previous quarter. The dividend will be payable to stockholders of record as of November 13, 2026, and is expected to be paid on November 27, 2026. Greene County Bancorp, MHC intends to waive its receipt of this dividend.

At the Company’s Annual Meeting on November 7, 2026, shareholders will consider a proposal to amend the Company’s charter to change its legal name from Greene County Bancorp, Inc. to Greene Bancorp, Inc. If approved, the name change is expected to become effective following certification of the shareholder vote on November 9, 2026. The Company’s Nasdaq trading symbol, “GCBC,” and CUSIP number are not expected to change.

Management has reviewed events from the date of the unaudited consolidated financial statements, and accompanying notes thereto, through the date of issuance, and determined that other than the matters described above, there were no additional subsequent events requiring adjustment to or disclosure in these unaudited consolidated financial statements.

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Item 2.