PROSPERITY BANCSHARES INC

1. NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING AND REPORTING POLICIES

Nature of Operations—Prosperity Bancshares, Inc.® (“Bancshares”) and its subsidiary, Prosperity Bank® (the “Bank”, collectively referred to as the “Company”), provide retail and commercial banking services.

As of December 31, 2025, the Bank operated 283 full-service banking locations:62 in the Houston area, including The Woodlands;33 in the South Texas area including Corpus Christi and Victoria;61 in the Dallas/Fort Worth area;22 in the East Texas area;31 in the Central Texas area including Austin and San Antonio;45 in the West Texas area including Lubbock, Midland-Odessa, Abilene, Amarillo and Wichita Falls;15 in the Bryan/College Station area;6 in the Central Oklahoma area; and 8 in the Tulsa, Oklahoma area.

Summary of Significant Accounting and Reporting Policies—The accounting and reporting policies of the Company conform to generally accepted accounting principles (“GAAP”) and the prevailing practices within the financial services industry. A summary of significant accounting and reporting policies are as follows:

Basis of Presentation—The consolidated financial statements include the accounts of Bancshares and its subsidiaries. Intercompany transactions have been eliminated in consolidation. Operations are managed and financial performance is evaluated on a company-wide basis. Accordingly, all of the Company’s banking operations are considered by management to be aggregated inone reportable operating segment. Because the overall banking operations comprise the vast majority of the consolidated operations, no separate segment disclosures are presented.

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 and 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. Such estimates include, but are not limited to, certain fair value measures including the calculation of stock-based compensation, the valuation of goodwill and available for sale and held to maturity securities and the calculation of allowance for credit losses. Actual results could differ from these estimates.

Business Combinations—Generally, acquisitions are accounted for under the acquisition method of accounting in accordance with Financial Accounting Standards Board (“FASB”) Accounting Standards Codification (“ASC”) Topic 805, “Business Combinations.”A business combination occurs when the Company acquires net assets that constitute a business and obtains control over that business. Business combinations are effected through the transfer of consideration consisting of cash and/or common stock and are accounted for using the acquisition method. Accordingly, the assets and liabilities of the acquired business are recorded at their respective fair values at the acquisition date. Determining the fair value of assets and liabilities, especially the loan portfolio, is a process involving significant judgment regarding methods and assumptions used to calculate estimated fair values. Fair values are subject to refinement for up to one year after the closing date of the acquisition as information relative to closing date fair values becomes available. The results of operations of an acquired entity are included in the Company’s consolidated results from acquisition date, and prior periods are not restated.

Securities—The investment securities portfolio is measured for expected credit losses by segregating the portfolio intotwo general classifications and applying the appropriate expected credit losses methodology. Investment securities classified as available for sale or held to maturity are evaluated for expected credit losses under FASB ASC Topic 326, “Financial Instruments-Credit Losses” (“CECL”).

Securities held to maturity are carried at cost, adjusted for the amortization of premiums and the accretion of discounts. Management has the positive intent and the Company has the ability to hold these assets until their estimated maturities.

Securities available for sale are carried at fair value. Unrealized gains and losses are excluded from earnings and reported, net of tax, as a separate component of shareholders’ equity until realized. Securities within the available for sale portfolio may be used as part of the Company’s asset/liability strategy and may be sold in response to changes in interest rate risk, prepayment risk or other similar economic factors.

For available for sale securities in an unrealized loss position, the amount of the expected credit losses recognized in earnings depends on whether an entity intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss. If an entity intends to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss, the expected credit losses will be recognized in earnings equal to the entire difference between the investment’s amortized cost basis and its fair value at the balance sheet date. If an entity does not intend to sell the security and it is not more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis less any current-period loss, the expected credit losses will be separated into the amount representing the credit-related portion of the impairment loss (“credit loss”) and the noncredit portion of the impairment loss (“noncredit portion”). The amount of the total expected credit losses related to the credit loss is determined based on the difference between the present value of cash flows expected to be collected and the amortized cost basis, and such difference is recognized in earnings. The amount of the total expected credit losses related to the noncredit portion is recognized in other comprehensive income, net of applicable taxes. The previous amortized cost basis less the expected credit losses recognized in earnings will become the new amortized cost basis of the investment. Premiums and discounts are amortized and accreted to operations using the level-yield method of accounting, adjusted for prepayments as applicable. The specific identification method of accounting is used to compute gains or losses on the sales of these assets. Interest earned on these assets is included in interest income.

Loans Held for Sale—Loans held for sale are carried at the lower of cost or market value. Premiums, discounts and loan fees (net of certain direct loan origination costs) on loans held for sale are deferred until the related loans are sold or repaid. Gains or losses on loan sales are recognized at the time of sale and determined using the specific identification method.

Loans Held for Investment—Loans originated and held for investment are stated at the principal amount outstanding, net of unearned fees. The related interest income for multi-payment loans is recognized principally by the simple interest method; for single payment loans, such income is recognized using the straight-line method.

The Company has two general categories of loans in its portfolio. Loans originated by the Bank and made pursuant to the Company’s loan policy and procedures in effect at the time the loan was made are referred to as “originated loans” and loans acquired in a business combination are referred to as “acquired loans.” Acquired loans are initially recorded at fair value based on a discounted cash flow valuation methodology that considers, among other things, interest rates, projected default rates, loss given default and recovery rates, with no carryover of any existing allowance for credit losses. Those acquired loans that are renewed or substantially modified after the date of the business combination are referred to as “re-underwritten acquired loans.” Modifications are reviewed for determination of loan modifications made to borrowers experiencing financial difficulty status independently of this process. In certain instances, acquired loans to one borrower may be combined or otherwise re-originated such that they are re-categorized as originated loans. Acquired loans with a fair value discount or premium at the date of the business combination that remained at the reporting date are referred to as “fair-valued acquired loans.” All fair-valued acquired loans are further categorized into “Non-PCD loans” and “PCD loans” (purchased credit deteriorated loans). Acquired loans with evidence of more than insignificant credit quality deterioration as of the acquisition date when compared to the origination date are classified as PCD loans.

The Company estimates the total cash flows expected to be collected from the PCD loans, which include undiscounted expected principal and interest, using credit risk, interest rate and prepayment risk assessments that incorporate management’s best estimate of current key assumptions such as default rates, loss severity and payment speeds. The excess of the undiscounted total cash flows expected to be collected over the fair value of the related PCD loans represents the accretable yield, which is recognized as interest income based on future cash flows, taking into account contractual maturities. The difference between the undiscounted contractual principal and the undiscounted total cash flows expected to be collected is the PCD reserve, which is included in the allowance for credit losses. Subsequent increases in expected cash flows will result in a recovery of any previously recorded allowance for credit losses, to the extent applicable. Subsequent decreases in expected cash flows will result in an impairment charge to the provision for credit losses, resulting in an addition to the allowance for credit losses.

A loan disposal, which may include a loan sale, receipt of payment in full from the borrower or foreclosure, results in removal of the loan from the balance sheet at its allocated carrying amount and accretion of any remaining fair value discount to income.

Warehouse Purchase Program Loans—All Warehouse Purchase Program loans are collectively evaluated for impairment and are purchased under several contractual requirements, providing safeguards to the Company. These safeguards include the requirement that the mortgage originator clients have a takeout commitment or similar arrangement for each loan. To date, the Company has not experienced a loss on these loans andno allowance for credit losses has been allocated to them.

Nonrefundable Fees and Costs Associated with Lending Activities—Loan origination fees in excess of the associated costs are recognized over the life of the related loan as an adjustment to yield using the interest method.

Loan commitment fees and loan origination costs are deferred and recognized as an adjustment of yield by the interest method over the related loan life or, if the commitment expires unexercised, recognized in income upon expiration of the commitment.

Nonperforming and Past Due Loans—Included in the nonperforming loan category are loans which have been categorized by management as nonaccrual because collection of interest is doubtful and loans which have been modified to provide a reduction in the interest rate or a deferral of interest or principal payments. The Company generally places a loan on nonaccrual status and ceases accruing interest when the payment of principal or interest is delinquent for 90 days, or earlier in some cases, unless the loan is in the process of collection and the underlying collateral fully supports the carrying value of the loan. If the decision is made to continue accruing interest on the loan, periodic reviews are made to confirm the accruing status of the loan. When a loan is placed on nonaccrual status, interest accrued but not yet collected prior to the determination as uncollectible is charged to operations. Interest accrued during prior periods is charged to the allowance for credit losses. Any payments received on nonaccrual loans are applied first to outstanding principal of the loan amount, next to the recovery of charged-off loan amounts and finally, any excess is treated as recovery of lost interest. A loan may be returned to accrual status when all the principal and interest amounts contractually due are brought current and future principal and interest amounts contractually due are reasonably assured, which is typically evidenced by a sustained period (at least six months) of repayment performance by the borrower.

Allowance for Credit Losses—The allowance for credit losses is accounted for in accordance with CECL which uses an expected loss methodology that is referred to as the current expected credit loss methodology. CECL requires a financial asset (or a group of financial assets) measured at amortized cost basis to be presented at the net amount expected to be collected. The allowance for credit losses is an allowance available for losses on loans and held-to-maturity securities that is deducted from the amortized cost basis to estimate the net amount expected to be collected. All losses are charged to the allowance when the loss actually occurs or when a determination is made that such a loss is likely and can be reasonably estimated. Recoveries are credited to the allowance at the time of recovery.

Throughout the year, management estimates the level of lifetime losses to determine whether the allowance for credit losses represents management’s best estimate of current expected credit losses in the loan portfolio. Based on these estimates, an amount is charged to the provision for credit losses and credited to the allowance for credit losses in order to adjust the allowance to a level determined to be adequate. In making its evaluation, management considers factors such as historical lifetime loan loss experience, the amount of nonperforming assets and related collateral, the volume, growth and composition of the portfolio, current economic conditions and reasonable and supportable forecasted economic conditions that may affect borrower ability to pay and the value of collateral, the evaluation of the portfolio through its internal loan review process and other relevant factors.

Estimates of credit losses involve an exercise of judgment. While it is possible that in the short term the Company may sustain losses which are substantial in relation to the allowance for credit losses, it is the judgment of management that the allowance for credit losses that is reflected in the consolidated balance sheets represents management’s best estimate of current expected credit losses on the Company’s loan portfolio as of December 31, 2025.

The Company’s allowance for credit losses consists of two elements: (1) specific valuation allowances based on expected losses on impaired loans and PCD loans; and (2) a general valuation allowance based on historical lifetime loan loss experience, current economic conditions, reasonable and supportable forecasted economic conditions, and other qualitative risk factors both internal and external to the Company.

Non-PCD loans that have deteriorated to an impaired status subsequent to acquisition are evaluated for a specific reserve on a quarterly basis which, when identified, is added to the allowance for credit losses. The Company reviews impaired Non-PCD loans on a loan-by-loan basis and determines the specific reserve based on the difference between the recorded investment in the loan and one of three factors: expected future cash flows, observable market price or fair value of the collateral. Because essentially all of the Company’s impaired Non-PCD loans have been collateral-dependent, the amount of the specific reserve historically has been determined by comparing the fair value of the collateral securing the Non-PCD loan with the recorded investment in such loan. In the future, the Company will continue to analyze impaired Non-PCD loans on a loan-by-loan basis and may use an alternative measurement method to determine the specific reserve, as appropriate and in accordance with applicable accounting standards.

PCD loans are monitored individually or on a pooled basis quarterly to assess for changes in expected cash flows subsequent to acquisition. If a deterioration in cash flows is identified, an increase to the PCD reserves for that individual loan or pool of loans may be required. PCD loans were recorded at their acquisition date fair values based on expected cash flows with a reserve established for the estimate of expected future cash flows. The Company’s estimates of loan fair values at the acquisition date may be adjusted for a period of up to one year as the Company continues to evaluate its estimate of expected future cash flows at the acquisition date. If the Company determines that losses arose after the acquisition date, the additional losses will be reflected as a provision for credit losses. For further discussion of the Company’s Allowance for Credit Losses on Loans, see Note 5 to the consolidated financial statements.

Accounting for Acquired Loans and the Allowance for Acquired Credit Losses—The Company accounts for its acquisitions using the acquisition method of accounting. Accordingly, the assets, including loans, and liabilities of the acquired entity were recorded at their fair values at the acquisition date. These fair value estimates associated with acquired loans, and based on a discounted cash flow model, include estimates related to market interest rates and undiscounted projections of future cash flows that incorporate expectations of prepayments and the amount and timing of principal, interest and other cash flows, as well as any shortfalls thereof. For further discussion of the Company’s acquisition and loan accounting, see Note 5 to the consolidated financial statements.

Allowance for Credit Losses on Off-Balance Sheet Credit Exposures—The allowance for credit losses on off-balance sheet credit exposures estimates expected credit losses over the contractual period in which there is exposure to credit risk via a contractual obligation to extend credit, except when an obligation is unconditionally cancellable by the Company. The allowance is adjusted by provisions for credit losses charged to earnings that increase the allowance, or by provision releases returned to earnings that decrease the allowance. The estimate includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on the commitments expected to fund. The estimate of commitments expected to fund is affected by historical analysis of utilization rates. The expected credit loss rates applied to the commitments expected to fund are affected by the general valuation allowance utilized for outstanding balances with the same underlying assumptions and drivers.

Premises and Equipment—Premises and equipment are carried at cost less accumulated depreciation. Depreciation expense is computed principally using the straight-line method over the estimated useful lives of the assets which range fromone to 39 years. Leasehold improvements are amortized using the straight-line method over the periods of the leases or the estimated useful lives, whichever is shorter.

Derivative Financial Instruments—The Company has interest rate swaps with certain commercial customers who wished to obtain a loan at a fixed rate. The Company enters into an interest rate swap with the customer while at the same time entering into an offsetting interest rate swap with another financial institution. In connection with each swap transaction, the Company agrees to pay interest to the borrowing customer on a notional amount at a variable interest rate and receives interest from the customer on the same notional amount at a fixed interest rate. At the same time, the Company agrees to pay another financial institution a similar fixed interest rate on the same notional amount and receive substantially the same variable interest rate on the same notional amount. The transaction allows the customer to effectively convert a variable-rate loan to a fixed-rate. Because the Company acts solely as an intermediary for its customer, changes in the fair value of the underlying derivative contracts largely offset each other and do not significantly impact the Company’s results of operations.

The Company has interest rate lock commitments and forward mortgage-backed securities trades. In the normal course of business, the Company enters into interest rate lock commitments with consumers to originate mortgage loans at a specified interest rate. These commitments, which contain fixed expiration dates, offer the borrower an interest rate guarantee provided the loan meets underwriting guidelines and closes within the timeframe established by the Company. The Company manages the changes in fair value associated with changes in interest rates related to interest rate lock commitments by using forward sold commitments known as forward mortgage-backed securities trades. These instruments are typically entered into at the time the interest rate lock commitment is made.

These financial instruments are not designated as hedging instruments and are used for asset and liability management and commercial customers’ financing needs. All derivatives are carried at fair value in either other assets or other liabilities and all related cash flows are reported in the operating section of the consolidated statements of cash flows.

Goodwill—Goodwill is annually assessed for impairment or when events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable.

Under FASB ASC Topic 350-20,“Intangibles—Goodwill and Other—Goodwill” companies have the option to first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying amount as a basis for determining the need to perform step one of the annual test for goodwill impairment. An entity has an unconditional option to bypass the qualitative assessment for any reporting unit in any period and proceed directly to performing the first step of the goodwill impairment test. An entity may resume performing the qualitative assessment in any subsequent period. If the estimated fair value of the reporting unit exceeds its carrying value, goodwill of the reporting unit is not impaired.

Amortization of Core Deposit Intangibles—Core deposit intangibles are being amortized on a non-pro rata basis over an estimated life of 10 to 15 years.

Income Taxes—The Company files a consolidated federal income tax return and consolidated state returns in Oklahoma, Colorado, New Mexico, New York and Tennessee. For the year ended December 31, 2025, the Bank will also file state returns in Arkansas, Florida, Georgia, Idaho, North Carolina, and Pennsylvania. In addition, the Company files a Combined Texas Franchise Tax Report.

Deferred tax assets and liabilities are recognized for the estimated tax consequences attributable to differences between the financial statement carrying amounts of existing assets and liabilities and their respective tax bases and are recorded net to other assets on the Company’s consolidated balance sheets. The Company records uncertain tax positions in accordance with FASB ASC Topic 740, “Income Taxes”, on the basis of a two-step process whereby (1) the Company determines whether it is more likely than not that the tax positions will be sustained on the basis of the technical merits of the position and (2) for those tax positions that meet the more-likely-than-not recognition threshold, the Company recognizes the largest amount of tax benefit that is more than 50 percent likely to be realized upon ultimate settlement with the related tax authority.

Realization of net deferred tax assets is based upon the level of historical income and on estimates of future taxable income. Although realization is not assured, management believes it is more likely than not that all of the net deferred tax assets will be realized.

The Company adopted ASU No. 2023-09, Income Taxes (Topic 740): Improvements to Income, effective as of December 31, 2025 on a retrospective basis. For further discussion of the Company’s income taxes, see Note 10 to the consolidated financial statements.

Stock-Based Compensation—The Company accounts for stock-based employee compensation plans using the fair value-based method of accounting. The expense associated with stock-based compensation is recognized over the vesting period of each individual arrangement. The fair value of restricted stock awards is based on the current market price on the date of grant.

Cash and Cash Equivalents—For purposes of reporting cash flows, cash and cash equivalents include cash and due from banks as well as federal funds sold that mature in three days or less.

Segment Reporting—The Company adopted ASU No. 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures effective as of December 31, 2024. The Company offers a variety of traditional loan and deposit products to its customers, which consist primarily of individual consumers and businesses throughout Texas and Oklahoma. The Company’s banking operations are considered by management to be aggregated in one reportable operating segment in accordance with FASB ASC Topic 280. The Chief Executive Officer is designated as the Company’s chief operating decision maker (“CODM”). The CODM evaluates banking operations and decides how to allocate resources based on consolidated net income that is also reported on the Company’s consolidated statement of income. Consolidated net income is used to monitor the Company’s revenue streams, significant expenses and to compare budget to actual results in assessing performance of the Company’s banking operations. Interest expense, provision for credit losses and salaries and employee benefits are considered significant expenses. As the Company’s operations consist of one reportable operating segment, the segment assets are reflected on the accompanying consolidated balance sheets as “total assets” and the significant segment expenses are listed on the accompanying consolidated statements of income. The Company’s segment accounting policies are the same as described herein and the Company does not have any intra-segment sales and transfers of assets.

Earnings Per Common Share—Basic earnings per common share are calculated using the two-class method. The two-class method provides that unvested share-based payment awards that contain nonforfeitable rights to dividends or dividend equivalents (whether paid or unpaid) are participating securities and shall be included in the computation of basic earnings per share.

Diluted earnings per common share is computed using the weighted-average number of shares determined for the basic earnings per common share computation plus the potential dilution that could occur if securities or other contracts to issue common stock were exercised or converted into common stock using the treasury stock method.

The following table illustrates the computation of basic and diluted earnings per share:

As of December 31, 2025, all stock options have been exercised and there areno options outstanding. There wereno stock options exercisable at December 31,2025, 2024 and 2023 that would have had an anti-dilutive effect on the above computation.

New Accounting Standards

Accounting Standards Updates (“ASU”)

ASU 2025-11, Interim Reporting (Topic 270): Narrow-Scope Improvements. ASU 2025‑11 clarifies interim disclosure requirements, including providing a comprehensive list of interim disclosure requirements under U.S. GAAP and a disclosure principle that requires entities to disclose events since the last annual reporting period that have a material impact on the entity. The standard is effective for interim periods within annual reporting periods beginning after December 15, 2027. The Company does not expect the adoption of ASU 2025-11 to have a significant impact on its financial statements.

ASU 2025-08, Financial Instruments—Credit Losses (Topic 326): Purchased Loans. Under ASU 2025-08, loans acquired without credit deterioration and deemed “seasoned” will be considered purchased seasoned loans and accounted for using the gross-up approach at acquisition (i.e., record the loan at its purchase price and separately record an allowance for expected credit losses). Seasoned loans include all loans acquired in a business combination that do not have “more-than-insignificant” deterioration of credit quality since origination, as well as loans purchased at least 90 days after origination where the purchaser was not involved in the origination of the loans. ASU 2025-08 is effective for annual and interim periods beginning in our fiscal 2028 with early adoption permitted. The Company is evaluating the impact the adoption of ASU 2025-08 will have on its financial statements.

ASU 2025-06, Intangibles—Goodwill and Other—Internal-Use Software (Subtopic 350-40): Targeted Improvements to the Accounting for Internal-Use Software. ASU 2025-06 modernizes the accounting for internal-use software costs. Under this ASU, software development costs are capitalized when (i) management has authorized and committed to funding the software project and (ii) it is probable that the project will be completed and the software will be used to perform the function intended. ASU 2025-06 is effective for fiscal years beginning after December 15, 2027, and interim reporting periods, with early adoption permitted. The Company does not expect the adoption of ASU 2025-06 to have a significant impact on its financial statements.

ASU 2024-03, Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses. ASU 2024-03 requires public companies to disclose, in the notes to the financial statements, specific information about certain costs and expenses at each interim and annual reporting period. This includes disclosing amounts related to employee compensation, depreciation, and intangible asset amortization. In addition, public companies will need to provide a qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively. ASU 2024-03 is effective for public business entities for annual reporting periods beginning after December 15, 2026, and interim reporting periods beginning after December 15, 2027. Implementation of ASU 2024-03 may be applied prospectively or retrospectively. The Company does not expect the adoption of ASU 2024-03 to have a significant impact on its financial statements.

ASU 2024-01, Compensation—Stock Compensation (Topic 718): Scope Application of Profits Interest and Similar Awards. ASU 2024-01 clarifies the scope application of profits interest and similar awards by adding illustrative guidance to help entities determine whether profits interest and similar awards should be accounted for as share-based payment arrangements within the scope of FASB ASC 718, “Compensation—Stock Compensation.” However, this amendment does not change the intent of that guidance, nor how it should be applied. The ASU’s amendments are effective for fiscal years beginning after December 15, 2024, including interim periods within those years. ASU 2024-01 became effective for the Company on December 31, 2024 and did not have a significant impact on the Company’s financial statements.

ASU 2023-09, Income Taxes (Topic 740): Improvements to Income. ASU 2023-09 focuses on the rate reconciliation and income taxes paid. ASU 2023-09 requires a public business entity to disclose, on an annual basis, a tabular rate reconciliation using both percentages and currency amounts, broken out into specified categories with certain reconciling items further broken out by nature and jurisdiction to the extent those items exceed a specified threshold. In addition, all entities are required to disclose income taxes paid, net of refunds received disaggregated by federal, state/local, and foreign and by jurisdiction if the amount is at least 5% of total income tax payments, net of refunds received. The Company adopted ASU 2023-09 as of December 31, 2025 on a retrospective basis, and it did not have a significant impact on the Company’s financial statements. For further discussion of the Company’s income taxes, See Note 10 to the consolidated financial statements.

ASU 2023-07, Segment Reporting (Topic 280) - Improvement to Reportable Segment Disclosures. ASU 2023-07 amends the disclosure requirements related to segment reporting primarily through enhanced disclosure about significant segment expenses that are regularly provided to the chief operating decision maker and by requiring disclosure of segment information on an annual and interim basis. The amendments in this update are effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. ASU 2023-07 became effective for the Company on December 31, 2024 and did not have a significant impact on the Company’s financial statements.

2. ACQUISITIONS

Acquisitions are an integral part of the Company’s growth strategy. All acquisitions were accounted for using the acquisition method of accounting. Accordingly, the assets and liabilities of the acquired entities were recorded at their fair values at the acquisition date. The excess of the purchase price over the estimated fair value of the net assets for tax-free acquisitions was recorded as goodwill, none of which is deductible for tax purposes. The excess of the purchase price over the estimated fair value of the net assets for taxable acquisitions was also recorded as goodwill and is deductible for tax purposes. The identified core deposit intangibles for each acquisition are being amortized using a non-pro rata basis over an estimated life of 10 to 15 years. The results of operations for each acquisition have been included in the Company’s consolidated financial results beginning on the respective acquisition date.

The measurement period for the Company to determine the fair values of acquired identifiable assets and assumed liabilities will end at the earlier of (1) twelve months from the date of the acquisition or (2) as soon as the Company receives the information it was seeking about facts and circumstances that existed as of the acquisition date or learns that more information is not obtainable.

Acquisition of Lone Star State Bancshares, Inc.— Effective April 1, 2024, the Company completed the merger of Lone Star State Bancshares, Inc. (“Lone Star”) into Bancshares and the subsequent merger of its wholly owned subsidiary Lone Star State Bank of West Texas (“Lone Star Bank”), into the Bank (collectively, the “Lone Star Merger”). Lone Star operated five full-service banking offices in the West Texas area, including its main office in Lubbock, and one banking center in each of Brownfield, Midland, Odessa and Big Spring, Texas. The acquisition was not considered significant to the Company’s financial statements and therefore pro forma financial data and related disclosures are not included. Pursuant to the terms of the definitive agreement, Bancshares issued 2,376,182 shares of its common stock plus approximately $64.1 million in cash for all outstanding shares of Lone Star. This resulted in goodwill of $106.7 million as of December 31, 2025, which reflected all final subsequent fair value adjustments. Goodwill represents the excess of the total purchase price paid over the fair value of the assets acquired, net of the fair value of liabilities assumed. Additionally, the Company recognized $17.7 million of core deposit intangibles related to the Lone Star Merger. In October 2024, the Company completed the operational conversion of Lone Star Bank.

Acquired Loans

Acquired loans were preliminarily recorded at fair value based on a discounted cash flow valuation methodology that considers, among other things, interest rates, projected default rates, loss given default, and recovery rates. Projected default rates, loss given default, and recovery rates for purchased credit deteriorated (“PCD”) loans primarily impact the related allowance, as opposed to the fair value mark. During the valuation process, the Company identified PCD and Non-PCD loans in the acquired loan portfolios. Loans acquired with evidence of credit quality deterioration since origination as of the acquisition date were accounted for as PCD. PCD loan identification considers the following factors: payment history and past due status, debt service coverage, loan grading, collateral values and other factors that may indicate deterioration of credit quality as of the acquisition date when compared to the origination date. Non-PCD loan identification considers the following factors: account types, remaining terms, annual interest rates or coupons, current market rates, interest types, past delinquencies, timing of principal and interest payments, loan to value ratios, loss exposures and remaining balances. Accretion of purchased discounts on PCD and Non-PCD loans will be recognized based on payment structure and the contractual maturity of individual loans.

PCD Loans. The recorded investment in PCD loans included in the consolidated balance sheets and the related outstanding balances at December 31, 2025 and 2024 are presented in the table below. The outstanding balance represents the total amount owed as of December 31, 2025 and 2024.

Changes in the accretable yield for acquired PCD loans for the years ended December 31,2025, and 2024 were as follows:

Income recognition on PCD loans is subject to the timing and amount of future cash flows. PCD loans for which the Company is accruing interest income are not considered nonperforming or impaired. The PCD discount reflected above as of December 31, 2025, represents the amount of discount available to be recognized as income.

Non-PCD Loans. The recorded investment in Non-PCD loans included in the consolidated balance sheets and the related outstanding balances at December 31, 2025 and 2024 are presented in the table below. The outstanding balance represents the total amount owed as of December 31, 2025 and 2024.

Changes in the discount accretion for Non-PCD loans for the years ended December 31,2025 and 2024 were as follows:

At December 31, 2025, the Company had$22.7 million of total outstanding net accretable discounts on Non-PCD and PCD loans.

3. GOODWILL AND CORE DEPOSIT INTANGIBLES

Changes in the carrying amount of the Company’s goodwill and core deposit intangibles for fiscal years 2025 and 2024 were as follows:

Management performs an evaluation annually, and more frequently if a triggering event occurs, of whether any impairment of the goodwill or core deposit intangibles has occurred. If any such impairment is determined, a write down is recorded. Based on the Company’s annual goodwill impairment test, management doesnot believe any of its goodwill is impaired as of December 31,2025.

Core deposit intangibles are being amortized on a non-pro rata basis over their estimated lives, which the Company believes is between 10 and 15 years. The estimated aggregate future amortization expense for core deposit intangibles remaining as of December 31,2025, is as follows (dollars in thousands):

4. SECURITIES

The amortized cost and fair value of investment securities were as follows:

The investment securities portfolio is measured for expected credit losses by segregating the portfolio intotwo general classifications and applying the appropriate expected credit losses methodology. Investment securities classified as available for sale or held to maturity are evaluated for expected credit losses under CECL.

Available for sale securities. For available for sale securities in an unrealized loss position, the amount of the expected credit losses recognized in earnings depends on whether an entity intends to sell the security or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss. If an entity intends to sell or more likely than not will be required to sell the security before recovery of its amortized cost basis less any current-period credit loss, the expected credit losses will be recognized in earnings equal to the entire difference between the investment’s amortized cost basis and its fair value at the balance sheet date. If an entity does not intend to sell the security and it is not more likely than not that the entity will be required to sell the security before recovery of its amortized cost basis less any current-period loss, the expected credit losses will be separated into the amount representing the credit-related portion of the impairment loss (“credit loss”) and the noncredit portion of the impairment loss (“noncredit portion”). The amount of the total expected credit losses related to the credit loss is determined based on the difference between the present value of cash flows expected to be collected and the amortized cost basis and such difference is recognized in earnings. The amount of the total expected credit losses related to the noncredit portion is recognized in other comprehensive income, net of applicable taxes. The previous amortized cost basis less the expected credit losses recognized in earnings will become the new amortized cost basis of the investment.

As of December 31, 2025, management does not have the intent to sell any of the securities classified as available for sale before a recovery of cost. In addition, management believes it is more likely than not that the Company will not be required to sell any of its investment securities before a recovery of cost. The unrealized losses are largely due to changes in market interest rates and spread relationships since the time the underlying securities were purchased. The fair value is expected to recover as the securities approach their maturity date or repricing date or if market yields for such investments decline. Management does not believe any of the securities are impaired due to reasons of credit quality. Accordingly, as of December 31, 2025, management believes that there is no potential for credit losses on available for sale securities.

Held to maturity securities. The Company’s held to maturity investments include mortgage-related bonds issued by either the Government National Mortgage Corporation (“Ginnie Mae”), Federal National Mortgage Association (“Fannie Mae”) or Federal Home Loan Mortgage Corporation (“Freddie Mac”). Ginnie Mae issued securities are explicitly guaranteed by the U.S. government, while Fannie Mae and Freddie Mac issued securities are fully guaranteed by those respective United States government-sponsored agencies, and conditionally guaranteed by the full faith and credit of the United States. The Company’s held to maturity securities also include taxable and tax-exempt municipal securities issued primarily by school districts, utility districts and municipalities located in Texas. The Company’s investment in municipal securities is exposed to credit risk. The securities are highly rated by major rating agencies and regularly reviewed by management. A significant portion are guaranteed or insured by either the Texas Permanent School Fund, Assured Guaranty or Build America Mutual. As of December 31, 2025, the Company’s municipal securities represent 0.7% of the securities portfolio. Management has the ability and intent to hold the securities classified as held to maturity until they mature, at which time the Company will receive full value for the securities. Accordingly, as of December 31, 2025, management believes that there isno potential for material credit losses on held to maturity securities.

Securities with unrealized losses segregated by length of time such securities have been in a continuous loss position were as follows:

At December 31, 2025 and 2024 there were 712 securities and 949 securities, respectively, in an unrealized loss position for 12 months or more.

The table below summarizes the amortized cost and fair value of investment securities at December 31,2025, by contractual maturity. Actual maturities will differ from contractual maturities because borrowers may have the right to call or prepay obligations at any time with or without call or prepayment penalties.

At December 31, 2025 and 2024, the Company did not own securities of any one issuer (other than the U.S. government and its agencies) for which aggregate adjusted cost exceeded 10% of the consolidated shareholders’ equity at such respective dates.

Securities with an amortized cost of $9.24 billion and $10.26 billion and a fair value of $8.43 billion and $8.91 billion at December 31,2025 and 2024, respectively, were pledged to collateralize public deposits and for other purposes required or permitted by law.

The Company recorded no gain or loss on sale of investment securities for the years ended December 31, 2025 and 2023. The Company recorded a $9.4 million net loss on the sale of investment securities for the year ended December 31,2024. As of December 31, 2025, the Company did not own any non-agency collateralized mortgage obligations.

Visa Class B-1 Stock Exchange. During the second quarter of 2024, the Bank tendered all of its shares of Visa, Inc. (“Visa”) Class B-1 common stock in exchange for a combination of Visa Class B-2 common stock and Visa Class C common stock, pursuant to the terms and subject to the conditions of the public offering of Visa to exchange its Class B-1 common stock for a combination of shares of its Class B-2 common stock and Class C common stock, which expired on May 3, 2024. The Company recorded a gain of $20.6 million during the second quarter of 2024 based on the conversion privilege of the Class C common stock and the closing price of Visa Class A common stock. In the exchange, the Bank received 48,492 shares of Class B-2 stock, recorded atzero cost basis, and 19,245 shares of Class C common stock and has subsequently sold all shares of Class C stock.

5. LOANS AND ALLOWANCE FOR CREDIT LOSSES

The loan portfolio consists of various types of loans made principally to borrowers located within the states of Texas and Oklahoma and is categorized by major type as follows:

Loan Origination/Risk Management. The Company has certain lending policies and procedures in place that are designed to maximize loan income within an acceptable level of risk. Management reviews and approves these policies and procedures on a regular basis. A reporting system supplements the review process by providing management with frequent reports related to loan production, loan quality, concentrations of credit, loan delinquencies and non-performing and potential problem loans. Diversification in the loan portfolio is a means of managing risk associated with fluctuations in economic conditions. Loans to borrowers with aggregate debt relationships over $1.0 million and below $5.0 million are evaluated and acted upon on a daily basis by two of the company-wide designated senior credit officers. Loans to borrowers with aggregate debt relationships above $5.0 million are evaluated and acted upon by an officers’ loan committee that meets weekly.

The Company maintains an independent loan review department that reviews and validates the credit risk program on a periodic basis. Results of these reviews are presented to management. The loan review process complements and reinforces the risk identification and assessment decisions made by lenders and credit personnel, as well as the Company’s policies and procedures.

(i) Commercial and Industrial Loans. In nearly all cases, the Company’s commercial loans are made in the Company’s market areas and are underwritten based on the borrower's ability to service the debt from the conversion of working assets or cash flow. Working capital loans are primarily collateralized by short-term assets whereas term loans are primarily collateralized by long-term assets. As a general practice, term loans are secured by any available real estate, equipment or other assets owned by the borrower. Both working capital and term loans are typically supported by a personal guaranty of a principal. In general, commercial loans involve more credit risk than residential mortgage loans and commercial mortgage loans and, therefore, usually yield a higher return.

The increased risk in commercial loans is due to the type of collateral securing these loans as well as the expectation that commercial loans generally will be serviced principally from the operations of the business, and those operations may not be successful. Historical trends have shown these types of loans to have higher delinquencies than mortgage loans. As a result of these additional complexities, variables and risks, commercial loans require more thorough underwriting and servicing than other types of loans.

(ii) Commercial Real Estate. The Company makes commercial real estate loans collateralized by owner-occupied and nonowner-occupied real estate to finance the purchase of real estate. The Company’s commercial real estate loans are collateralized by first liens on real estate, typically have variable interest rates (orfive year or less fixed rates) and amortize over a 15- to 25-year period. Payments on loans secured by nonowner-occupied properties are often dependent on the successful operation or management of the properties. Accordingly, repayment of these loans may be subject to adverse conditions in the real estate market or the economy to a greater extent than other types of loans. The Company seeks to minimize these risks in a variety of ways, including giving careful consideration of the property’s operating history, future operating projections, current and projected occupancy, location and physical condition in connection with underwriting these loans. The underwriting analysis also includes credit verification, analysis of global cash flow, collateral valuation and a review of the financial condition of the borrower and guarantor. Loans to hotels and restaurants are primarily included in commercial real estate loans.

(iii) 1-4 Family Residential Loans. The Company’s lending activities also include the origination of 1-4 family residential mortgage loans (including home equity loans) collateralized by owner-occupied and nonowner-occupied residential properties located in the Company’s market areas. The Company offers a variety of mortgage loan portfolio products which generally are amortized over five to 30 years. Loans collateralized by 1-4 family residential real estate generally have been originated in amounts of no more than 89% of appraised value. The Company requires mortgage title insurance, as well as hazard, wind and/or flood insurance as appropriate. The Company prefers to retain residential mortgage loans for its own account rather than selling them into the secondary market. By doing so, the Company incurs interest rate risk as well as the risks associated with non-payments on such loans. The Company’s mortgage department also offers a variety of mortgage loan products which are generally amortized over 30 years, including FHA and VA loans, which are sold to secondary market investors.

(iv) Construction, Land Development and Other Land Loans. The Company makes loans to finance the construction of residential and nonresidential properties. Construction loans generally are collateralized by first liens on real estate and have variable interest rates. The Company conducts periodic inspections, either directly or through an agent, prior to approval of periodic draws on these loans. Underwriting guidelines similar to those described above are also used in the Company’s construction lending activities, with heightened analysis of construction and/or development costs. Construction loans involve additional risks attributable to the fact that loan funds are advanced upon the security of a project under construction, and the project is of uncertain value prior to its completion. Because of uncertainties inherent in estimating construction costs, the market value of the completed project and the effects of governmental regulation on real property, it can be difficult to accurately evaluate the total funds required to complete a project and the related loan to value ratio. As a result of these uncertainties, construction lending often involves the disbursement of substantial funds with repayment dependent, in part, on the success of the ultimate project rather than the ability of a borrower or guarantor to repay the loan. If the Company is forced to foreclose on a project prior to completion, the Company may not be able to recover all of the unpaid portion of the loan. In addition, the Company may be required to fund additional amounts to complete a project and may have to hold the property for an indeterminate period of time. Although the Company has underwriting procedures designed to identify what it believes to be acceptable levels of risks in construction lending, these procedures may not prevent losses from the risks described above.

(v) Warehouse Purchase Program. The Warehouse Purchase Program allows unaffiliated mortgage originators (“Clients”) to close 1-4 family real estate loans in their own name and manage their cash flow needs until the loans are sold to investors. The Company’s Clients are strategically targeted for their experienced management teams and analyzed for the expected profitability of each Client’s business model over the long term. The Clients are located across the U.S. and originate mortgage loans primarily through traditional retail and/or wholesale business models using underwriting standards consistent with the United States government-sponsored enterprises, “Agencies” such as Fannie Mae, the private investors to which the mortgage loans are ultimately sold and the mortgage insurers.

Although not subject to any legally binding commitment, when the Company makes a purchase decision, it acquires a 100% participation interest in the mortgage loans originated by its Clients. Individual mortgage loans are warehoused in the Company’s portfolio only for a short duration, averaging less than 30 days. When instructed by a Client that a warehoused loan has been sold to an investor, the Company delivers the note to the investor that pays the Company, which in turn remits the net sales proceeds to the Client.

(vi) Agriculture Loans. The Company provides agriculture loans for short-term livestock and crop production, including rice, cotton, milo and corn, farm equipment financing and agriculture real estate financing. The Company evaluates agriculture borrowers primarily based on their historical profitability, level of experience in their particular industry segment, overall financial capacity and the availability of secondary collateral to withstand economic and natural variations common to the industry. Because agriculture loans present a higher level of risk associated with events caused by nature, the Company routinely makes on-site visits and inspections in order to identify and monitor such risks.

(vii) Consumer Loans. Consumer loans made by the Company include direct “A”-credit automobile loans, recreational vehicle loans, boat loans, home improvement loans, personal loans (collateralized and uncollateralized) and deposit account collateralized loans. The terms of these loans typically range from 12 to 180 months and vary based upon the nature of collateral and size of loan. Generally, consumer loans entail greater risk than do real estate secured loans, particularly in the case of consumer loans that are unsecured or collateralized by rapidly depreciating assets such as automobiles. In such cases, any repossessed collateral for a defaulted consumer loan may not provide an adequate source of repayment for the outstanding loan balance. The remaining deficiency often does not warrant further substantial collection efforts against the borrower beyond obtaining a deficiency judgment. In addition, consumer loan collections are dependent on the borrower’s continuing financial stability, and thus are more likely to be adversely affected by job loss, divorce, illness, personal bankruptcy or death. Furthermore, the application of various federal and state laws may limit the amount which can be recovered on such loans.

Loan Maturities. The contractual maturity ranges of the Company’s loan portfolio, excluding loans held for sale of$14.2 million and Warehouse Purchase Program Loans of$1.30 billion, by type of loan and the amount of such loans with predetermined interest rates and variable rates in each maturity range as of December 31, 2025 are summarized in the following table. Contractual maturities are based on contractual amounts outstanding and do not include loan purchase net discounts of$22.7 million.

Concentrations of Credit. Most of the Company’s lending activity occurs within the states of Texas and Oklahoma. Commercial real estate loans, 1-4 family residential loans and construction, land development and other land loans made up 81.8% and 81.3% of the Company’s total loan portfolio, excluding Warehouse Purchase Program loans, at December 31,2025 and 2024, respectively. As of December 31, 2025 and 2024, excluding Warehouse Purchase Program loans, there were no concentrations of loans related to any single industry in excess of 10% of total loans.

Related Party Loans. As of December 31, 2025 and 2024, loans outstanding to directors, officers and their affiliates totaled$272 thousand and$266 thousand, respectively. All transactions between the Company and such related parties are conducted in the ordinary course of business and made on the same terms and conditions as similar transactions with unaffiliated persons.

An analysis of activity with respect to these related-party loans is as follows:

Nonperforming Assets and Nonaccrual and Past Due Loans. The Company has several procedures in place to assist it in maintaining the overall quality of its loan portfolio. The Company has established underwriting guidelines to be followed by its officers, including requiring appraisals on loans collateralized by real estate. The Company also monitors its delinquency levels for any negative or adverse trends. Nevertheless, the Company’s loan portfolio could become subject to increasing pressures from deteriorating borrower credit due to general economic conditions.

The Company generally places a loan on nonaccrual status and ceases accruing interest when the payment of principal or interest is delinquent for 90 days, or earlier in some cases unless the loan is in the process of collection and the underlying collateral fully supports the carrying value of the loan. A loan may be returned to accrual status when all the principal and interest amounts contractually due are brought current and future principal and interest amounts contractually due are reasonably assured, which is typically evidenced by a sustained period (at least six months) of repayment performance by the borrower.

With respect to potential problem loans, an evaluation of the borrower’s overall financial condition is made, together with an appraisal for loans collateralized by real estate, to determine the need, if any, for possible write downs or appropriate additions to the allowance for credit losses.

An aging analysis of past due loans, segregated by category of loan, is presented below:

(1)

Includes$14.2 million and$10.7 million of residential mortgage loans held for sale at December 31, 2025 and 2024, respectively.

The following table presents information regarding nonperforming assets at the dates indicated:

(1)

ASU 2022-02 became effective for the Company on January 1, 2023.

(2)

There wereno nonperforming Warehouse Purchase Program loans or Warehouse Purchase Program lines of credit for the periods presented.

The Company had$150.8 million in nonperforming assets at December 31, 2025, compared with$81.5 million at December 31, 2024, and$72.7 million at December 31, 2023. Nonperforming assets were 0.69% of total loans and other real estate at December 31, 2025, compared with 0.37% and 0.34% of total loans and other real estate at December 31, 2024 and 2023, respectively. The nonperforming assets consisted of 449 separate credits or other real estate properties at December 31,2025, compared with 368 at December 31,2024, and 292 at December 31,2023. The Company had$137.2 million,$73.6 million and$68.7 million in nonaccrual loans at December 31, 2025, 2024 and 2023, respectively.

Credit Quality Indicators. As part of the ongoing monitoring of the credit quality of the Company’s loan portfolio and methodology for calculating the allowance for credit losses, management assigns and tracks loan grades to be used as credit quality indicators.

The following is a general description of the loan grades used:

Grade 1—Credits in this category have risk potential that is virtually nonexistent. These loans may be secured by insured certificates of deposit, insured savings accounts, U.S. Government securities and highly rated municipal bonds.

Grade 2—Credits in this category are of the highest quality. These borrowers represent top-rated companies and individuals with unquestionable financial standing with excellent global cash flow coverage, net worth, liquidity and collateral coverage.

Grade 3—Credits in this category are not immune from risk but are well protected by the collateral and paying capacity of the borrower. These loans may exhibit a minor unfavorable credit factor, but the overall credit is sufficiently strong to minimize the possibility of loss.

Grade 4—Credits in this category are considered to be of acceptable credit quality with moderately greater risk than Grade 3 and receiving closer monitoring. Loans in this category have sources of repayment that remain sufficient to preclude a larger than normal probability of default and secondary sources are likewise currently of sufficient quantity, quality, and liquidity to protect the Company against loss of principal and interest. These borrowers have specific risk factors, but the overall strength of the credit is acceptable based on other mitigating credit and/or collateral factors and can repay the debt in the normal course of business.

Grade 5—Credits in this category constitute an undue and unwarranted credit risk; however, the factors do not rise to a level of substandard. These credits have potential weaknesses and/or declining trends that, if not corrected, could expose the Company to risk at a future date. These loans are monitored on the Company’s internally-generated watch list and evaluated on a quarterly basis.

Grade 6—Credits in this category are considered “substandard” but “non-impaired” loans in accordance with regulatory guidelines. Loans in this category have well-defined weakness that, if not corrected, could make default of principal and interest possible. Loans in this category are still accruing interest and may be dependent upon secondary sources of repayment and/or collateral liquidation.

Grade 7—Credits in this category are deemed “substandard” and “impaired” pursuant to regulatory guidelines. As such, the Company has determined that it is probable that less than 100% of the contractual principal and interest will be collected. These loans are individually evaluated for a specific reserve and will typically have the accrual of interest stopped.

Grade 8—Credits in this category include “doubtful” loans in accordance with regulatory guidance. Such loans are no longer accruing interest and factors indicate a loss is imminent. These loans are also deemed “impaired.” While a specific reserve may be in place while the loan and collateral are being evaluated these loans are typically charged down to an amount the Company estimates is collectible.

Grade 9—Credits in this category are deemed a “loss” in accordance with regulatory guidelines and have been charged off or charged down. The Company may continue collection efforts and may have partial recovery in the future.

The following table presents loans by risk grade and category of loan and year of origination at December 31,2025.

(1)

Includes$14.2 million of residential mortgage loans held for sale at December 31, 2025.

Allowance for Credit Losses on Loans. The allowance for credit losses is adjusted through charges to earnings in the form of a provision for credit losses. Management has established an allowance for credit losses that it believes is management’s best estimate of current expected credit losses on the Company’s loan portfolio as of December 31, 2025. The amount of the allowance for credit losses on loans is affected by the following: (1) charge-offs of loans that occur when loans are deemed uncollectible and decrease the allowance, (2) recoveries on loans previously charged off that increase the allowance, (3) provisions for credit losses charged to earnings that increase the allowance, and (4) provision releases returned to earnings that decrease the allowance. Based on an evaluation of the loan portfolio and consideration of the factors listed below, management presents a quarterly review of the allowance for credit losses to the Bank’s Board of Directors, indicating any change in the allowance since the last review and any recommendations as to adjustments in the allowance. Although management believes it uses the best information available to make determinations with respect to the allowance for credit losses, future adjustments may be necessary if economic conditions or borrower performance differ from the assumptions used in making the initial determinations.

The Company’s allowance for credit losses on loans consists of two components: (1) a specific valuation allowance based on expected losses on specifically identified loans and (2) a general valuation allowance based on historical lifetime loan loss experience, current economic conditions, reasonable and supportable forecasted economic conditions and other qualitative risk factors both internal and external to the Company.

In setting the specific valuation allowance, the Company follows a loan review program to evaluate the credit risk in the total loan portfolio and assigns risk grades to each loan. Through this loan review process, the Company maintains an internal list of impaired loans which, along with the delinquency list of loans, helps management assess the overall quality of the loan portfolio and the adequacy of the allowance for credit losses. All loans that have been identified as impaired are reviewed on a quarterly basis in order to determine whether a specific reserve is required. For certain impaired loans, the Company allocates a specific loan loss reserve primarily based on the value of the collateral securing the impaired loan in accordance with CECL. The specific reserves are determined on an individual loan basis. Loans for which specific reserves are provided are excluded from the general valuation allowance described below.

In connection with this review of the loan portfolio, the Company considers risk elements attributable to particular loan types or categories in assessing the quality of individual loans. Some of the risk elements include:

•

for 1-4 family residential mortgage loans, the borrower’s ability to repay the loan, including a consideration of the debt to income ratio and employment and income stability, the loan to value ratio, and the age, condition and marketability of collateral;

•

for commercial real estate loans and multifamily residential loans, the debt service coverage ratio (income from the property in excess of operating expenses compared to loan payment requirements), operating results of the owner in the case of owner-occupied properties, the loan to value ratio, the age and condition of the collateral and the volatility of income, property value and future operating results typical of properties of that type;

•

for construction, land development and other land loans, the perceived feasibility of the project including the ability to sell developed lots or improvements constructed for resale or the ability to lease property constructed for lease, the quality and nature of contracts for presale or prelease, if any, experience and ability of the developer and loan to value ratio;

•

for commercial and industrial loans, the operating results of the commercial, industrial or professional enterprise, the borrower’s business, professional and financial ability and expertise, the specific risks and volatility of income and operating results typical for businesses in that category and the value, nature and marketability of collateral;

•

for the Warehouse Purchase Program, the capitalization and liquidity of the mortgage banking client, the operating experience, the Client’s satisfactory underwriting of purchased loans and the consistent timeliness by the Client of loan resale to investors;

•

for agricultural real estate loans, the experience and financial capability of the borrower, projected debt service coverage of the operations of the borrower and loan to value ratio; and

•

for non-real estate agricultural loans, the operating results, experience and financial capability of the borrower, historical and expected market conditions and the value, nature and marketability of collateral.

In addition, for each category, the Company considers secondary sources of income and the financial strength and credit history of the borrower and any guarantors.

In determining the amount of the general valuation allowance, management considers factors such as historical lifetime loan loss experience, concentration risk of specific loan types, the volume, growth and composition of the Company’s loan portfolio, current economic conditions and reasonable and supportable forecasted economic conditions that may affect borrower ability to pay and the value of collateral, the evaluation of the Company’s loan portfolio through its internal loan review process, other qualitative risk factors both internal and external to the Company and other relevant factors in accordance with CECL. Historical lifetime loan loss experience is determined by utilizing an open-pool (“cumulative loss rate”) methodology. Adjustments to the historical lifetime loan loss experience are made for differences in current loan pool risk characteristics such as portfolio concentrations, delinquency, non-accrual, and watch list levels, as well as changes in current and forecasted economic conditions such as unemployment rates, property and collateral values, and other indices relating to economic activity. The utilization of reasonable and supportable forecasts includes an immediate reversion to lifetime historical loss rates. Based on a review of these factors for each loan type, the Company applies an estimated percentage to the outstanding balance of each loan type, excluding any loan that has a specific reserve. Allocation of a portion of the allowance to one category of loans does not preclude its availability to cover expected losses in other categories.

A change in the allowance for credit losses can be attributable to several factors, most notably (1) specific reserves identified for impaired loans and PCD loans, (2) historical lifetime credit loss information, (3) changes in current and forecasted environmental factors and (4) growth in the balance of loans.

Changes in the Company’s asset quality are reflected in the allowance in several ways. Specific reserves that are calculated on a loan-by-loan basis and the qualitative assessment of all other loans reflect current changes in the credit quality of the loan portfolio. Historical lifetime credit losses, on the other hand, are based on an open-pool (“cumulative loss rate”) methodology, which is then applied to estimate lifetime credit losses in the loan portfolio. A deterioration in the credit quality of the loan portfolio in the current period would increase the historical lifetime loss rate to be applied in future periods, just as an improvement in credit quality would decrease the historical lifetime loss rate.

The allowance for credit losses is further determined by the size of the loan portfolio subject to the allowance methodology and environmental factors that include Company-specific risk indicators and general economic conditions, both of which are constantly changing. The Company evaluates the economic and portfolio-specific factors on a quarterly basis to determine a qualitative component of the general valuation allowance. The factors include current economic metrics, reasonable and supportable forecasted economic metrics, business conditions, delinquency trends, credit concentrations, nature and volume of the portfolio and other adjustments for items not covered by specific reserves and historical lifetime loss experience. Management’s assessment of qualitative factors is a statistically based approach to determine the loss rate adjustment associated with such factors. Based on the Company’s actual historical lifetime loan loss experience relative to economic and loan portfolio-specific factors at the time the losses occurred, management is able to identify the expected level of lifetime losses as of the date of measurement. The correlation of historical loss experience with current and forecasted economic conditions provides an estimate of lifetime losses that has not been previously factored into the general valuation allowance by the determination of specific reserves and lifetime historical losses. Additionally, the Company considers qualitative factors not easily quantified and the possibility of model imprecision.

Utilizing the aggregation of specific reserves, historical loss experience and a qualitative component, management is able to determine the valuation allowance to reflect the full lifetime loss.

The Company accounts for its acquisitions using the acquisition method of accounting. Accordingly, the assets, including loans, and liabilities of the acquired entity were recorded at their fair values at the acquisition date. These fair value estimates associated with acquired loans, and based on a discounted cash flow model, include estimates related to market interest rates and undiscounted projections of future cash flows that incorporate expectations of prepayments and the amount and timing of principal, interest and other cash flows, as well as any shortfalls thereof.

Non-PCD loans that were not deemed impaired subsequent to the acquisition date are considered non-impaired and are evaluated as part of the general valuation allowance. Non-PCD loans that have deteriorated to an impaired status subsequent to acquisition are evaluated for a specific reserve on a quarterly basis which, when identified, is added to the allowance for credit losses. The Company reviews impaired Non-PCD loans on a loan-by-loan basis and determines the specific reserve based on the difference between the recorded investment in the loan and one of three factors: expected future cash flows, observable market price or fair value of the collateral. Because essentially all of the Company’s impaired Non-PCD loans have been collateral-dependent, the amount of the specific reserve historically has been determined by comparing the fair value of the collateral securing the Non-PCD loan with the recorded investment in such loan. In the future, the Company will continue to analyze impaired Non-PCD loans on a loan-by-loan basis and may use an alternative measurement method to determine the specific reserve, as appropriate and in accordance with applicable accounting standards.

PCD loans are monitored individually or on a pooled basis quarterly to assess for changes in expected cash flows subsequent to acquisition. If a deterioration in cash flows is identified, an increase to the PCD reserves for that individual loan or pool of loans may be required. PCD loans were recorded at their acquisition date fair values based on expected cash flows with a reserve established for the estimate of expected future cash flows. The Company’s estimates of loan fair values at the acquisition date may be adjusted for a period of up to one year as the Company continues to evaluate its estimate of expected future cash flows at the acquisition date. If the Company determines that losses arose after the acquisition date, the additional losses will be reflected as a provision for credit losses.

The following tables detail the activity in the allowance for credit losses on loans by category of loan for the years ended December 31,2025, 2024 and 2023, respectively.

The allowance for credit losses on loans as of December 31, 2025, totaled$333.7 million or 1.53% of total loans, including acquired loans with discounts, a decrease of $18.1 million or 5.1% compared to the allowance for credit losses on loans totaling$351.8 million or 1.59% of total loans, including acquired loans with discounts, as of December 31, 2024.

There wasno provision for credit losses for the year ended December 31,2025, compared to a $9.1 million provision for credit losses for year ended December 31,2024 and $18.5 million provision for credit losses for the year ended December 31, 2023. The $9.1 million provision was due to loans acquired in the Lone Star Merger and consisted of a $7.9 million provision for credit losses on loans and a $1.2 million provision for credit losses on off-balance sheet credit exposures.

Net charge-offs were$18.1 million for the year ended December 31, 2025, compared with$14.6 million for the year ended December 31, 2024. For the year ended December 31, 2025, $18.9 million ofreserves on resolved PCD loans without any related charge-offs were released to the general reserve.

Allowance for Credit Losses on Off-Balance Sheet Credit Exposures. The allowance for credit losses on off-balance sheet credit exposures estimates expected credit losses over the contractual period in which there is exposure to credit risk via a contractual obligation to extend credit, except when an obligation is unconditionally cancellable by the Company. The allowance is adjusted by provisions for credit losses charged to earnings that increase the allowance, or by provision releases returned to earnings that decrease the allowance. The estimate includes consideration of the likelihood that funding will occur and an estimate of expected credit losses on the commitments expected to fund. The estimate of commitments expected to fund is affected by historical analysis of utilization rates. The expected credit loss rates applied to the commitments expected to fund are affected by the general valuation allowance utilized for outstanding balances with the same underlying assumptions and drivers. As of December 31, 2025 and 2024, the Company had $37.6 millionin allowance for credit losses on off-balance sheet credit exposures. The allowance for credit losses on off-balance sheet credit exposures is a separate line item on the Company’s consolidated balance sheet. As of December 31, 2025, the Company had$1.30 billion in commitments expected to fund.

The following table represents a rollforward of the allowance for credit losses on off-balance sheet credit exposures as of the dates indicated.

Loan Modifications Made to Borrowers Experiencing Financial Difficulty. The Company evaluates all restructurings, including restructurings for borrowers experiencing financial difficulty, to determine whether they result in a new loan or a continuation of an existing loan. In accordance with CECL, the Company only establishes a specific reserve for modifications to borrowers experiencing financial difficulty when the loan is identified as impaired. The effect of most modifications of loans made to borrowers who are experiencing financial difficulty is already included in the allowance for credit losses because of the measurement methodologies used to estimate the allowance. The Company adjusts the terms of loans for certain borrowers when it believes such changes will help its customers manage their loan obligations and increase the collectability of the loans.

Modifications of loans made to borrowers experiencing financial difficulty may include but are not limited to changes in committed loan amount, interest rate, amortization, note maturity, borrower, guarantor, collateral, forbearance, forgiveness of principal or interest, and other actions intended to minimize economic loss and to avoid foreclosure or repossession of collateral. The approval of modifications of loans for borrowers experiencing financial difficulty is handled on a case-by-case basis.

The following table displays the amortized cost of loans that were both experiencing financial difficulty and modified during the years ended December 31,2025 and 2024, presented by category of loan and by type of modification.

The financial effects of the loan modifications made to borrowers experiencing financial difficulty were not significant during the years ended December 31, 2025 and 2024. Furthermore, such modifications did not significantly impact the Company’s determination of the allowance for credit losses during those periods.

The Company did not have any loans made to borrowers experiencing financial difficulty that were modified during the years ended December 31, 2025 and 2024 that subsequently defaulted and were modified in the twelve months prior to default. Payment default is defined as movement to nonperforming status, foreclosure or charge-off, whichever occurs first.

6. FAIR VALUE

The Company uses fair value measurements to record fair value adjustments to certain assets and to determine fair value disclosures. Fair values represent the estimated price that would be received from selling an asset or paid to transfer a liability, otherwise known as an “exit price.” Securities available for sale are recorded at fair value on a recurring basis. Additionally, from time to time, the Company may be required to record at fair value other assets on a nonrecurring basis. These nonrecurring fair value adjustments typically involve application of lower-of-cost-or-market accounting or write downs of individual assets. FASB ASC Topic 820,“Fair Value Measurements and Disclosures” establishes a fair value hierarchy for valuation inputs that gives the highest priority to quoted prices in active markets for identical assets or liabilities and the lowest priority to unobservable inputs. The fair value hierarchy is as follows:

Fair Value Hierarchy

The Company groups financial assets and financial liabilities measured at fair value in three levels, based on the markets in which the assets and liabilities are traded and the reliability of the assumptions used to determine fair value. These levels are:

•

Level 1—Quoted prices in active markets for identical assets or liabilities.

•

Level 2—Other significant observable inputs (including quoted prices in active markets for similar assets or liabilities) or other inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities.

•

Level 3—Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the assets or liabilities.

The fair value of an asset or liability is the price that would be received to sell that asset or paid to transfer that liability in an orderly transaction occurring in the principal market (or most advantageous market in the absence of a principal market) for such asset or liability. In estimating fair value, the Company utilizes valuation techniques that are consistent with the market approach, the income approach and/or the cost approach. Such valuation techniques are consistently applied. Inputs to valuation techniques include the assumptions that market participants would use in pricing an asset or liability.

The fair value disclosures below represent the Company’s estimates based on relevant market information and information about the financial instruments. Fair value estimates are based on judgments regarding current economic conditions, risk characteristics of the various instruments, and other factors. These estimates are subjective in nature and involve uncertainties and matters of significant judgment and therefore cannot be determined with precision. Changes in the above methodologies and assumptions could significantly affect the estimates.

The following tables present fair values for assets measured at fair value on a recurring basis:

Certain assets and liabilities are measured at fair value on a nonrecurring basis; that is, the instruments are not measured at fair value on an ongoing basis but are subject to fair value adjustments in certain circumstances (for example, when there is evidence of impairment). These instruments include other real estate owned, repossessed assets, held to maturity debt securities, loans held for sale, and impaired loans. For the year ended December 31, 2025, the Company had additions to other real estate owned of $18.7 million, of which $11.5 million were outstanding as of December 31,2025. For the year ended December 31, 2025, the Company had additions to impaired loans of $119.9 million, of which $101.3 million were outstanding as of December 31,2025. The remaining financial assets and liabilities measured at fair value on a non-recurring basis that were recorded in 2025 and remained outstanding at December 31, 2025 were not significant.

The following tables summarize the carrying values and estimated fair values of certain financial instruments not recorded at fair value on a recurring basis:

Entities may choose to measure eligible financial instruments at fair value at specified election dates. The fair value measurement option (1) may be applied instrument by instrument, with certain exceptions, (2) is generally irrevocable and (3) is applied only to entire instruments and not to portions of instruments. Unrealized gains and losses on items for which the fair value measurement option has been elected must be reported in earnings at each subsequent reporting date. During the reported periods, the Company had no financial instruments measured at fair value under the fair value measurement option.

The fair value estimates presented herein are based on pertinent information available to management as of the dates indicated. Although management is not aware of any factors that would significantly affect the estimated fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since those dates and, therefore, current estimates of fair value may differ significantly from the amounts presented herein.

The following is a description of valuation methodologies used for assets and liabilities recorded at fair value, non-financial assets and non-financial liabilities, and for estimating fair value for financial instruments not recorded at fair value:

Loans held for sale—Loans held for sale are carried at the lower of cost or estimated fair value. Fair value for consumer mortgages held for sale is based on commitments on hand from investors or prevailing market prices. As such, the Company classifies loans held for sale subjected to nonrecurring fair value adjustments as Level 2.

Loans held for investment—The Company does not record loans at fair value on a recurring basis. As such, valuation techniques discussed herein for loans are primarily for estimating fair value disclosures. The Company’s discounted cash flow calculation to determine fair value considers internal and market-based information such as prepayment risk, cost of funds and liquidity. From time to time, the Company records nonrecurring fair value adjustments to impaired loans to reflect (1) partial write downs that are based on the observable market price or current appraised value of the collateral, or (2) the full charge-off of the loan carrying value. Where appraisals are not available, estimated cash flows are discounted using a rate commensurate with the credit risk associated with those cash flows. Assumptions regarding credit risk, cash flows and discount rates are judgmentally determined using available market information and specific borrower information.

The Company classifies the estimated fair value of loans held for investment as Level 3.

Other real estate owned—Other real estate owned is primarily foreclosed properties securing residential loans and commercial real estate loans. Foreclosed assets are adjusted to fair value less estimated costs to sell upon transfer of the loans to other real estate owned. Subsequently, these assets are carried at the lower of carrying value or fair value less estimated costs to sell. Other real estate carried at fair value based on an observable market price or a current appraised value is classified by the Company as Level 2. When management determines that the fair value of other real estate requires additional adjustments, either as a result of a non-current appraisal or when there is no observable market price, the Company classifies the other real estate as Level 3.

The fair value estimates presented herein are based on information available to management at December 31, 2025. Although management is not aware of any factors that would significantly affect the estimated fair value amounts, such amounts have not been comprehensively revalued for purposes of these financial statements since those dates and, therefore, current estimates of fair value may differ significantly from the amounts presented herein.

7. PREMISES AND EQUIPMENT

Premises and equipment are summarized as follows:

Depreciation expense was$19.7 million,$19.1 million and$18.3 million for the years ended December 31, 2025, 2024 and 2023, respectively.

8. DEPOSITS

Included in interest-bearing deposits are certificates of deposit in amounts of $250,000 or more. These certificates and their remaining maturities at December 31,2025 were as follows (dollars in thousands):

As of December 31, 2025, the Company hadno deposits classified as brokered deposits for regulatory purposes, and there are no major concentrations of deposits with any one depositor.

9. OTHER BORROWINGS AND SECURITIES SOLD UNDER REPURCHASE AGREEMENTS

The Company utilizes borrowings to supplement deposits to fund its lending and investment activities. Borrowings consist of funds from the Federal Home Loan Bank (“FHLB”), securities sold under repurchase agreements and the Federal Reserve Board Bank Term Funding Program (“BTFP”).

FHLB advances and long-term notes payable—The Company has an available line of credit with the FHLB of Dallas, which allows the Company to borrow on a collateralized basis. The Company’s FHLB advances are typically considered short-term borrowings and are used to manage liquidity as needed. Maturing advances are replaced by drawing on available cash, making additional borrowings or through increased customer deposits. At December 31, 2025, the Company had total borrowing capacity of$7.58 billion under this line. FHLB advances of$1.95 billion were outstanding at December 31, 2025, with a weighted-average interest rate of 3.63%. At December 31, 2025, the Company hadno FHLB long-term notes payable balance outstanding.

Securities sold under repurchase agreements with Company customers—At December 31, 2025, the Company had$201.2 million in securities sold under repurchase agreements compared with$221.9 million at December 31, 2024, a decrease of $20.7 million or 9.3%, with weighted average interest rates paid of 2.35% and 2.70% for the years ended December 31, 2025 and 2024, respectively. Repurchase agreements are generally settled on the following business day. All securities sold under repurchase agreements are collateralized by certain pledged securities.

Bank Term Funding Program— During the second quarter of 2023, the Bank began participating in the BTFP, which ceased extending new loans as of March 11, 2024. Under the BTFP program, eligible depository institutions could obtain loans of up to one year in length by pledging U.S. Treasuries, agency debt and mortgage-backed securities, and other qualifying assets as collateral. At December 31, 2025, the Company hadno BTFP balance outstanding.

10. INCOME TAXES

The components of income tax expense are as follows:

The Company doesnot have pretax income from continuing foreign operations or foreign tax expense.

The provision for federal income taxes differs from the amount computed by applying the federal income tax statutory rate of 21% for 2025, 2024 and 2023 to income before income taxes as follows:

(1)

State taxes in Oklahoma, New York, and Texas made up the majority (greater than 50%) of the tax effect in this category.

(2)

The “nontaxable or nondeductible items” category includes items such as non-taxable interest income, non-taxable income from bank-owned life insurance policies, non-deductible Federal Deposit Insurance Corporation (“FDIC”)premiums, non-deductible executive compensation, and other non-deductible expenses. None of those items individually or in the aggregate exceeded the 5% quantitative threshold for separate disaggregation in the current year.

Year-end deferred taxes are presented in the table below. Deferred taxes as of December 31,2025 and 2024 are based on the U.S. statutory federal corporate income tax rate of 21%.

The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities, projected future taxable income, and tax planning strategies in making this assessment. Based upon the level of historical taxable income and estimates of future taxable income over the periods for which the deferred tax assets are deductible, management believes it is more likely than not the Company will realize the benefits of these deductible differences at December 31, 2025.

Benefits from tax positions are recognized in the financial statements only when it is more likely than not that the tax position will be sustained upon examination by the appropriate taxing authority that would have full knowledge of all relevant information. A tax position that meets the more-likely-than-not recognition threshold is measured at the largest amount of benefit that is greater than fifty percent likely of being realized upon ultimate settlement. Tax positions that previously failed to meet the more-likely-than-not recognition threshold are recognized in the first subsequent financial reporting period in which that threshold is met. Previously recognized tax positions that no longer meet the more-likely-than-not recognition threshold are derecognized in the first subsequent financial reporting period in which that threshold is no longer met. The Company hadno material tax positions at December 31, 2025 or December 31, 2024 that did not meet the more-likely-than not recognition threshold. FASB ASC Topic 740 “Income Taxes” also provides guidance on the accounting for and disclosure of unrecognized tax benefits, interest and penalties. The Company’s policy for recording interest and penalties associated with audits is to record such items as a component of income before taxes. Penalties are recorded in other (gains) losses and interest paid or received is recorded in interest expense or interest income, respectively, in the consolidated statement of income. As of December 31, 2025 and 2024, the Company has not accrued any interest and penalties related to unrecognized tax benefits. The Company has identified its federal tax return and its state tax returns in Texas, Oklahoma, Colorado, New Mexico, New York, and Tennessee as “major” tax jurisdictions, as defined. The Bank has identified its state returns in Arkansas, Florida, Georgia, Idaho, North Carolina, and Pennsylvania as “major” tax jurisdictions, as defined. The periods subject to examination for the Company’s federal return are the 2022 through 2025 tax years. The Company has assumed net operating loss (“NOLs”) carryforwards, “acquired NOLs”, through its previous acquisitions. The tax periods of the acquired entities from which these acquired NOLs originated are considered open years for purposes of adjusting the amount of the acquired NOLs used in the Company’s open years. As of December 31, 2025, the Company has fully utilized all acquired NOLs.

Enactment of the One Big Beautiful Bill Act—On July 4, 2025, the One Big Beautiful Bill Act (the “OBBB Act”), which included certain modifications to U.S. tax law, was enacted. The Company has completed its initial evaluation of the provisions of the

OBBBAct and has concluded that it did not have a material impact on the Company's income tax provision for the year ended December 31, 2025.

11. STOCK INCENTIVE PROGRAMS

At December 31, 2025, Bancshares hadone active stock-based incentive compensation plan with awards outstanding. The Company accounts for stock-based incentive compensation plans using the fair value-based method of accounting. The Company recognized stock-based compensation expense of$12.1 million,$12.8 million, and$12.2 million for the years ended December 31, 2025, 2024 and 2023, respectively. There was approximately$1.5 million,$1.6 million and$1.7 million of income tax benefit recorded for the stock-based compensation expense for the same periods, respectively.

On March 3, 2020, Bancshares’ Board of Directors established the Prosperity Bancshares, Inc. 2020 Stock Incentive Plan (the “2020 Plan”), which was approved by Bancshares’ shareholders at the annual meeting of shareholders on April 21, 2020. The 2020 Plan authorizes the issuance of up to 2,500,000 shares of common stock upon the exercise of options or pursuant to the grant or exercise, as the case may be, of other awards granted under the 2020 Plan, including incentive stock options, nonqualified stock options, stock appreciation rights, shares of restricted stock and restricted stock units. As of December 31,2025,565,381 shares of issued restricted common stock have vested and 552,588 shares of issued restricted stock remain unvested.

Restricted Stock

During 2025, 2024 and 2023, Bancshares granted shares of restricted stock pursuant to the 2020 Plan. These shares of restricted stock generally vest over a period ofone tothree years. The Company accounts for restricted stock grants by recording the fair value of the grant as compensation expense over the vesting period. Compensation expense related to restricted stock was$12.1 million,$12.8 million and$12.2 million for the years ended December 31, 2025, 2024 and 2023, respectively.

A summary of the status of nonvested shares of issued restricted stock as of December 31,2025, and changes during the year then ended is as follows:

The total fair value of restricted stock awards that fully vested during the year ended December 31, 2025, was$9.4 million.

As of December 31, 2025, there was$17.1 million of total unrecognized compensation expense related to stock-based compensation arrangements. That cost is expected to be recognized over a weighted average period of 1.42 years.

12. OTHER NONINTEREST INCOME AND EXPENSE

Other noninterest income and expense totals are more fully detailed in the following tables. Any components of these totals exceeding 1% of the aggregate of total net interest income and total noninterest income for any of the years presented, as well as amounts the Company elected to present, are stated separately.

13. PROFIT SHARING PLAN

The Company has adopted a profit sharing plan pursuant to Section 401(k) of the Internal Revenue Code (the “Code”), whereby the participants may contribute a percentage of their compensation as permitted under the Code. Matching contributions are made at the discretion of the Company. Presently, the Company matches 50% of an employee’s contributions, up to 15% of such employee’s compensation, not to exceed the maximum allowable pursuant to the Code and excluding catch-up contributions. Such matching contributions were approximately$6.6 million,$6.9 million and$6.0 million for the years ended December 31, 2025, 2024 and 2023, respectively.

14. OFF-BALANCE SHEET ARRANGEMENTS, COMMITMENTS AND CONTINGENCIES

The Company’s contractual obligations and other commitments to make future payments (other than deposit obligations and securities sold under repurchase agreements) as of December 31, 2025, are summarized below.

Federal Home Loan Bank Borrowings

The Company’s future cash payments associated with its contractual obligations pursuant to its FHLB advances as of December 31,2025, is summarized below.

Off-Balance Sheet Items

In the normal course of business, the Company enters into various transactions that, in accordance with GAAP, are not included in its consolidated balance sheets. The Company enters into these transactions to meet the financing needs of its customers. These transactions include commitments to extend credit and standby letters of credit, which involve, to varying degrees, elements of credit risk and interest rate risk in excess of the amounts recognized in the consolidated balance sheets.

The Company’s commitments associated with outstanding standby letters of credit, unused capacity on Warehouse Purchase Program loans and commitments to extend credit expiring by period as of December 31,2025, are summarized below. Since commitments associated with letters of credit, unused capacity on Warehouse Purchase Program loans and commitments to extend credit may expire unused, the amounts shown may not necessarily reflect the actual future cash funding requirements.

Standby Letters of Credit. Standby letters of credit are written conditional commitments issued by the Company to guarantee the payment by or performance of a customer to a third party. If the customer does not perform in accordance with the terms of the agreement with the third party, the Company would be required to fund the commitment. The maximum potential amount of future payments the Company could be required to make is represented by the contractual amount of the commitment. If the commitment is funded, the Company would be entitled to seek recovery from the customer. The Company’s policies generally require that standby letter of credit arrangements contain security and debt covenants similar to those contained in loan agreements.

Unused Capacity on Warehouse Purchase Program Loans. For Warehouse Purchase Program loans, the Company has established maximum purchase facility amounts, but reserves the right, at any time, to refuse to buy any mortgage loans offered for sale by each customer, for any reason.

Commitments to Extend Credit. The Company enters into contractual commitments to extend credit, normally with fixed expiration dates or termination clauses, at specified rates and for specific purposes. Substantially all of the Company’s commitments to extend credit are contingent upon customers maintaining specific credit standards at the time of loan funding. The Company minimizes its exposure to loss under these commitments by subjecting them to credit approval and monitoring procedures. Management assesses the credit risk associated with certain commitments to extend credit in determining the level of the allowance for credit losses.

At December 31, 2025,$246.5 million of commitments to extend credit and standby letters of credit have fixed rates ranging from 0% to 21.0%.

The Company evaluates customer creditworthiness on a case-by-case basis. The amount of collateral obtained, if considered necessary by the Company upon extension of credit, is based on management’s credit evaluation of the customer.

Allowance for Credit Losses on Off-Balance Sheet Credit Exposures. The Company records an allowance for credit losses on off-balance sheet credit exposure that is adjusted through an entry to provision for credit losses on the Company’s consolidated statement of income. At December 31, 2025 and 2024, this allowance, reported as a separate line item on the Company’s consolidated balance sheet, totaled $37.6 million.

Leases

The Company’s leases relate primarily to operating leases for office space and banking centers. The Company determines if an arrangement is a lease or contains a lease at inception. The Company’s leases have remaining lease terms of 1 to 15 years, which may include the option to extend the lease when it is reasonably certain for the Company to exercise that option. Operating lease right-of-use (“ROU”) assets and liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. The Company uses its incremental collateralized borrowing rate to determine the present value of lease payments. Short-term leases and leases with variable lease costs are immaterial and the Company hasone sublease arrangement. Sublease income for the years ended December 31,2025, 2024 and 2023 was$3.3 million,$3.4 million and$3.1 million, respectively. As of December 31, 2025, operating lease ROU assets and lease liabilities were approximately$28.1 million. ROU assets and lease liabilities were classified as other assets and other liabilities, respectively.

As of December 31, 2025, the weighted average remaining lease terms of the Company’s operating leases were 5.9 years. The weighted average discount rate used to determine the lease liabilities as of December 31,2025, for the Company’s operating leases was 3.2%. Cash paid for the Company’s operating leases for the years ended December 31, 2025, 2024 and 2023 was$11.6 million,

$11.5 million and$12.0 million, respectively. During the year ended December 31, 2025, the Company obtained$3.5 million in ROU assets in exchange for lease liabilities for nine operating leases.

The Company’s future undiscounted cash payments associated with its operating leases as of December 31,2025, are summarized below (dollars in thousands).

It is expected that in the normal course of business, expiring leases will be renewed or replaced by leases on other property or equipment.

Rent expense under all operating lease obligations aggregated approximately$11.6 million,$11.5 million and$12.1 million for the years ended December 31, 2025, 2024 and 2023, respectively.

Litigation—The Company and the Bank are defendants, from time to time, in legal actions arising from transactions conducted in the ordinary course of business. After consultations with legal counsel, the Company and the Bank believe that the ultimate liability, if any, arising from such actions will not have a material adverse effect on their financial statements.

15. OTHER COMPREHENSIVE INCOME (LOSS)

Activity in accumulated other comprehensive (loss) income, net of tax, was as follows:

16. DERIVATIVE FINANCIAL INSTRUMENTS

The following table provides the outstanding notional balances and fair values of outstanding derivative positions at December 31,2025 and 2024.

These financial instruments are not designated as hedging instruments and are used for asset and liability management and commercial customers’ financing needs. All derivatives are carried at fair value in either other assets or other liabilities, and all related cash flows are reported in the operating section of the consolidated statements of cash flows.

Interest rate lock commitments (“IRLCs”) — In the normal course of business, the Company enters into interest rate lock commitments with consumers to originate mortgage loans at a specified interest rate. These commitments, which contain fixed expiration dates, offer the borrower an interest rate guarantee provided the loan meets underwriting guidelines and closes within the timeframe established by the Company.

Forward mortgage-backed securities trades — The Company manages the changes in fair value associated with changes in interest rates related to IRLCs by using forward sold commitments known as forward mortgage-backed securities trades. These instruments are typically entered into at the time the interest rate lock commitment is made.

Interest rate swaps and caps — These derivative positions relate to transactions in which the Company enters into an interest rate swap or cap with a customer, while at the same time entering into an offsetting interest rate swap or cap with another financial institution. An interest rate swap transaction allows the Company’s customer to effectively convert a variable rate loan to a fixed rate. In connection with each swap, the Company agrees to pay interest to the customer on a notional amount at a variable interest rate and receive interest from the customer on a similar notional amount at a fixed interest rate. At the same time, the Company agrees to pay another financial institution a similar fixed interest rate on the same notional amount and receive substantially the same variable interest rate on the same notional amount. In connection with each interest rate cap, the Company sells a cap to the customer and agree to pay interest if the underlying index exceeds the strike price defined in the cap agreement. Simultaneously the Company purchases a cap with matching terms from another financial institution that agrees to pay the Company if the underlying index exceeds the strike price.

The commercial loan customer counterparty weighted average received and paid interest rates for interest rate swaps outstanding at December 31,2025 and 2024 are presented in the following table.

The Company’s credit exposure on interest rate swaps is limited to the net favorable value of all swaps by each counterparty, which was approximately $778 thousand and $686 thousand at December 31,2025 and 2024, respectively. This credit exposure is partly mitigated as transactions with customers are secured by the collateral, if any, securing the underlying transaction being hedged. The Company’s credit exposure, net of collateral pledged, relating to interest rate swaps with upstream financial institution counter-parties waszero at December 31,2025. A credit support annex is in place and allows the Company to call collateral from upstream financial institution counterparties. Collateral levels are monitored and adjusted on a regular basis for changes in interest rate swap values. The Company’s cash collateral pledged for interest rate swaps was $650 thousand andzero at December 31,2025 and 2024, respectively.

The initial and subsequent changes in the fair value of IRLCs and the forward sales of mortgage-backed securities are recorded in mortgage income. These gains and losses were not attributable to instrument-specific credit risk. For interest rate swaps and caps, because the Company acts as an intermediary for its customer, changes in the fair value of the underlying derivative contracts substantially offset each other and do not have a material impact on its results of operations. Income for the years ended December 31,2025, 2024 and 2023 was as follows:

17. REGULATORY MATTERS

Bancshares and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. Any institution that fails to meet its minimum capital requirements is subject to actions by regulators that could have a direct material effect on its financial statements. Under the capital adequacy guidelines and the regulatory framework for prompt corrective action, the Bank must meet specific capital guidelines based on the Bank’s assets, liabilities and certain off-balance-sheet items as calculated under regulatory accounting practices. Bancshares’ and the Bank’s capital amounts and the Bank’s classification under the regulatory framework for prompt corrective action are also subject to qualitative judgments by the regulators about the components, risk weightings and other factors.

The Basel III Capital Rules require Bancshares and the Bank to maintain a capital conservation buffer, composed entirely of common equity tier 1 capital (“CET1”), of 2.5%, effectively resulting in minimum ratios of (1) CET1 to risk-weighted assets of 7.0%, (2) Tier 1 capital to risk-weighted assets of 8.5%, (3) total capital (that is, Tier 1 plus Tier 2) to risk-weighted assets of 10.5% and (4) Tier 1 capital to average quarterly assets as reported on consolidated financial statements (known as the “leverage ratio”) of 4.0%.

The CET1, Tier 1 and total capital ratios are calculated by dividing the respective capital amounts by risk weighted assets. Risk weighted assets include total assets, excluding goodwill and other intangible assets, allocated by risk weight category, and certain off-balance-sheet items. The leverage ratio is calculated by dividing Tier 1 capital by adjusted quarterly average total assets, excluding goodwill and other intangible assets.

To meet the capital adequacy requirements, Bancshares and the Bank must maintain minimum capital amounts and ratios of CET1, Tier 1 and Total capital to risk weighted assets, and of Tier 1 capital to adjusted quarterly average assets as defined in the regulations. As of December 31, 2025, Bancshares and the Bank met all capital adequacy requirements to which they were subject.

As of December 31, 2025, the most recent notification from the FDIC categorized the Bank as “well capitalized” under the regulatory framework for prompt corrective action. There have been no conditions or events since that notification which management believes have changed the Bank’s category. To be categorized as well capitalized the Bank must maintain minimum CET1 risk-based, Tier 1 risk-based, total risk-based and Tier 1 leverage ratios as set forth in the table below.

The following is a summary of Bancshares’ and the Bank’s capital ratios at December 31,2025 and 2024:

Dividends paid by Bancshares and the Bank are subject to restrictions by certain regulatory agencies. Dividends declared to be paid by Bancshares during the years ended December 31, 2025, 2024 and 2023 were$221.4 million,$214.4 million and$205.7 million, respectively. Dividends paid by the Bank to Bancshares during the years ended December 31, 2025, 2024 and 2023 were$607.2 million,$352.8 million and$373.2 million, respectively.

18. PARENT COMPANY ONLY FINANCIAL STATEMENTS

CONDENSED BALANCE SHEETS

CONDENSED STATEMENTS OF INCOME

CONDENSED STATEMENTS OF COMPREHENSIVE INCOME

CONDENSED STATEMENTS OF CASH FLOWS

19. SUBSEQUENT EVENTS

Acquisition of American Bank Holding Corporation — On January 1, 2026, the Company completed the merger of American Bank Holding Corporation (“American”) into Bancshares and the subsequent merger of its wholly owned subsidiary American Bank, N.A. (“American Bank”), into the Bank (collectively, the “American Merger”). American Bank operated 18 banking offices and 2 loan production offices in South and Central Texas including its main office in Corpus Christi, and banking offices in San Antonio, Austin, Victoria and the greater Corpus Christi area including Port Aransas and Rockport and a loan production office in Houston, Texas. Pursuant to the terms of thedefinitive agreement, Bancshares issued 4,439,938 shares of its common stock for all outstanding shares of American common stock in the first quarter of 2026.

Acquisition of Southwest Bancshares, Inc. —On February 1, 2026, the Company completed the merger of Southwest Bancshares, Inc. (“Southwest”) into Bancshares and the subsequent merger of its wholly owned subsidiary Texas Partners Bank (“Texas Partners”), into the Bank (collectively, the “Southwest Merger”). Texas Partners operated 11 banking offices in Central Texas including its main office in San Antonio, and banking offices in the San Antonio area, Austin and the Hill Country. Pursuant to the terms of the definitive agreement, Bancshares issued 4,094,974 shares of its common stock for all outstanding shares of Southwest common stock in the first quarter of 2026.

Pending Acquisition of Stellar Bancorp, Inc.—On January 28, 2026, Bancshares and Stellar Bancorp, Inc. (“Stellar”) jointly announced the signing of a definitive merger agreement whereby Stellar, the parent company of Stellar Bank (“Stellar Bank”) will merge with and into Bancshares and Stellar Bank will merge with and into the Bank. Stellar Bank operates 52 banking offices in greater Houston and Beaumont, Texas and surrounding areas. Under the terms and subject to the conditions of the definitive agreement, Bancshares will issue 0.3803 shares of Prosperity Bancshares common stock and $11.36 in cash for each outstanding share of Stellar common stock. Based on the closing price of the Company’s common stock of $72.90 on January 27, 2026, the total consideration was valued at approximately $2.00 billion. The transaction is subject to customary closing conditions, including the receipt of regulatory approvals.