FIRST FINANCIAL CORP IN

The accompanying March 31, 2025 and 2024 consolidated financial statements are unaudited. The December 31, 2024 consolidated financial statements are as reported in the First Financial Corporation (the “Corporation”) 2024 annual report. The information presented does not include all information and footnotes required by U.S. generally accepted accounting principles for complete financial statements. The following notes should be read together with notes to the consolidated financial statements included in the 10-K filed with the Securities and Exchange Commission for the fiscal year ended December 31, 2024.

1. Significant Accounting Policies

The significant accounting policies followed by the Corporation and its subsidiaries for interim financial reporting are consistent with the accounting policies followed for annual financial reporting. All adjustments which are, in the opinion of management, necessary for a fair statement of the results for the periods reported have been included in the accompanying consolidated financial statements and are of a normal recurring nature. The Corporation reports financial information for onlyone segment, banking. Some items in the prior year financials were reclassified to conform to the current presentation.

The Omnibus Equity Incentive Plan is a long-term incentive plan that was designed to align the interests of participants with the interests of shareholders. Under the plan, awards may be made based on certain performance measures. The grants are made in restricted stock units that are subject to a vesting schedule. These shares vest over 3 years in increments of 33%,33%, and 34% respectively. For the three months ended 2025 and 2024,25,134 and 27,803 shares were awarded, respectively. These shares had a grant date value of $1.2 million and $1.0 million for 2025 and 2024, vest over three years, and their grant is not subject to future performance measures. Outstanding shares are increased at the award date for the total shares awarded.

On July 1, 2024, the Corporation completed its acquisition of SimplyBank. Therefore, the results of SimplyBank have been included in the results of operations beginning on July 1, 2024. See footnote 12, Acquisitions, for more information.

2. New accounting standards

Accounting Pronouncements Adopted:

In March 2023, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2023-02*“*Investments Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method.” These amendments allow reporting entities to elect to account for qualifying tax equity investments using the proportional amortization method, regardless of the program giving rise to the related income tax credits. This guidance is effective for public business entities for fiscal years including interim periods within those fiscal years, beginning after December 15, 2023. Early adoption is permitted in any interim period. The Corporation adopted ASU 2023-02 on January 1, 2024 on a modified retrospective basis. As a result of the adoption, other assets increased $19 million, other liabilities increased $21 million, and retained earnings decreased $1.7 million.

In November 2023, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2023-07 “Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures.” These amendments require, among other things, that a public entity that has a single reportable segment provide all the disclosures required by the amendments in this ASU and all existing segment disclosures in Topic 208. The ASU is effective for fiscal years beginning after December 15, 2023, and interim periods within fiscal years beginning after December 15, 2024. Early adoption is permitted. The Corporation adopted ASU 2023-07 on January 1, 2024 for fiscal year activity and will apply ASU 2023-07 in interim periods within fiscal years beginning January 1, 2025.

In December 2023, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2023-09 “Income Taxes (Topic 740): Improvements to Income Tax Disclosures.” Among other things, these amendments require that public business entities on an annual basis (1) disclose specific categories in the rate reconciliation and (2) provide additional information for reconciling items that meet a quantitative threshold (if the effect of those reconciling items is equal to or greater than five percent of the amount computed by multiplying pretax income (loss) by the applicable statutory income tax rate.) The amendments also require that all entities disclose on an annual basis the following information about income taxes paid: (1) the amount of income taxes paid (net of refunds received) disaggregated by federal, state, and foreign taxes and (2) the amount of income taxes paid (net of refunds received)

disaggregated by individual jurisdictions in which income taxes paid (net of refunds received) is equal to or greater than five percent of total income taxes paid (net of refunds received.) This guidance is effective for public business entities for annual periods beginning after December 15, 2024. Early adoption is permitted for annual financial statements that have not yet been issued or made available for issuance. The amendments should be applied on a prospective basis although retrospective application is permitted. The Corporation adopted ASU 2023-09 January 1, 2025, and will provide the required disclosures in the Corporation’s 2025 filings.

Recent Accounting Pronouncements:

In November 2024, the Financial Accounting Standards Board (FASB) issued Accounting Standards Update (ASU) No. 2024-03, “Income Statement – Reporting Comprehensive Income – Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses.” This update is intended to provide investors more detailed disclosures around specific types of expenses. This ASU requires certain details for expenses presented on the face of the consolidated statements of income as well as selling expenses to be presented in the notes to the financial statements. This update is effective for fiscal years beginning after December 15, 2026, and interim periods within fiscal years beginning after December 15, 2027, with early adoption permitted. The disclosure updates are required to be applied prospectively with the option for retrospective application. The Corporation is assessing ASU 2024-03 and its effect on its consolidated financial statements and related disclosures.

3. Allowance for Credit Losses

The following table presents the activity of the allowance for credit losses by portfolio segment for the three months ended March 31.

The tables below present the recorded investment in non-performing loans by class of loans.

The following tables present the amortized cost basis of collateral dependent loans by class of loans:

The following tables presents the aging of the recorded investment in loans by past due category and class of loans.

Loan Modifications Made to Borrowers Experiencing Financial Difficulty:

Modification of the terms of such loans typically include one or a combination of the following: a reduction of the stated interest rate of the loan; an extension of the maturity date at a stated rate of interest lower than the current market rate for new debt with similar risk; or a permanent reduction of the recorded investment in the loan.

The following table presents the amortized cost of loans and leases at March 31, 2025 that were both experiencing financial difficulty and modified during the twelve months ended March 31, 2025, by class and by type of modification. The percentage of the amortized cost of loans and leases that were modified to borrowers in financial distress as compared to the amortized cost of each class of financial receivable is also presented below.

The Corporation has no commitments to lend additional amounts to the borrowers included in the table above.

The Corporation closely monitors the performance of loans and leases that have been modified to borrowers experiencing financial difficulty to understand the effectiveness of its modification efforts. The following table presents the performance of such loans that have been modified in the last twelve months:

The following table presents the financial effect of loan and lease modifications presented above to borrowers experiencing financial difficulty for the twelve months ended March 31, 2025.

The following table presents the amortized cost basis of loans that had a payment default during the twelve months ended March 31, 2025 and were modified in the twelve months prior to that default to borrowers experiencing financial difficulty. A loan is considered to be in payment default once it is 30 days contractually past due under the modified terms.

Upon the Corporation’s determination that a modified loan has subsequently been deemed uncollectible, the loan is written off. Therefore, the amortized cost basis of the loan is reduced by the uncollectible amount and the allowance for credit losses is adjusted by the same amount.

Credit Quality Indicators:

The Corporation categorizes loans into risk categories based on relevant information about the ability of borrowers to service their debt such as: current financial information, historical payment experience, credit documentation, public information, and current economic trends, among other factors. The Corporation analyzes loans individually by classifying the loans as to credit risk. This analysis includes non-homogeneous loans, such as commercial loans, with an outstanding balance greater than $100 thousand. Any consumer loans outstanding to a borrower who had commercial loans analyzed will be similarly risk rated. This analysis is performed on a quarterly basis. The Corporation uses the following definitions for risk ratings:

Special Mention: Loans classified as special mention have a potential weakness that deserves management’s close attention. If left uncorrected, these potential weaknesses may result in deterioration of the repayment prospects for the loan or of the institution’s credit position at some future date.

Substandard: Loans classified as substandard are inadequately protected by the current net worth and debt service capacity of the borrower or of any pledged collateral. These loans have a well-defined weakness or weaknesses which have clearly jeopardized repayment of principal and interest as originally intended. They are characterized by the distinct possibility that the institution will sustain some future loss if the deficiencies are not corrected.

Doubtful: Loans classified as doubtful have all the weaknesses inherent in those graded substandard, with the added characteristic that the severity of the weaknesses makes collection or liquidation in full highly questionable or improbable based upon currently existing facts, conditions, and values.

Furthermore, non-homogeneous loans which were not individually analyzed, but are 90+ days past due or on non-accrual are classified as substandard. Loans included in homogeneous pools, such as residential or consumer may be classified as substandard due to 90+ days delinquency, non-accrual status, bankruptcy, or loan restructuring.

The following tables present the commercial loan portfolio by risk category. These balances do not include accrued interest:

The Corporation evaluates the credit quality of its other loan portfolios, which includes residential real estate, consumer and lease financing loans, based primarily on the aging status of the loan and payment activity. Accordingly, loans on non-accrual status and loans past due 90 days or more and still accruing interest are considered to be nonperforming for purposes of credit quality evaluation. The following table presents the other loan portfolio based on the credit risk profile of loans that are performing and loans that are nonperforming. These balances do not include accrued interest:

4. Securities

The amortized cost and fair value of the Corporation’s investments are shown below. All securities are classified as available-for-sale.

Contractual maturities of debt securities at March 31, 2025 were as follows.

There wereno gross gains and losses from investment sales/calls realized by the Corporation for the three months ended March 31, 2025. Additionally, there wereno gross gains and losses from investment sales/calls realized by the Corporation for the three months ended March 31, 2024.

The following tables show the securities’ gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in continuous unrealized loss position, at March 31, 2025 and December 31, 2024.