OLD SECOND BANCORP INC

Consolidated Balance Sheets

(In thousands, except share data)

See accompanying notes to consolidated financial statements*.*

Consolidated Statements of****Income

(In thousands, except per share data)

See accompanying notes to consolidated financial statements.

Consolidated Statements of Comprehensive Income

See accompanying notes to consolidated financial statements.

Consolidated Statements of Cash Flows

See accompanying notes to consolidated financial statements.

Consolidated Statements of Changes in

Stockholders’ Equity

Note 1 – Basis of Presentation and Changes in Significant Accounting Policies

The accounting policies followed in the preparation of the interim consolidated financial statements are consistent with those used in the preparation of the annual financial information. The interim consolidated financial statements reflect all normal and recurring adjustments that are necessary, in the opinion of management, for a fair statement of results for the interim period presented. Results for the period ended June 30, 2025, are not necessarily indicative of the results that may be expected for the year ending December 31, 2025. These interim consolidated financial statements and accompanying notes are unaudited and should be read in conjunction with the audited financial statements and notes included in Old Second Bancorp, Inc.’s (the “Company”) annual report on Form 10-K for the year ended December 31, 2024. Unless otherwise indicated, dollar amounts in the tables contained in the notes to the consolidated financial statements are in thousands. Certain items in prior periods have been reclassified to conform to the current presentation.

The Company’s consolidated financial statements are prepared in accordance with United States generally accepted accounting principles (“GAAP”) and follow general practices within the banking industry. Application of these principles requires management to make estimates, assumptions, and judgments that affect the amounts reported in the consolidated financial statements and accompanying notes. These estimates, assumptions, and judgments are based on information available as of the date of the consolidated financial statements. Future changes in information may affect these estimates, assumptions, and judgments, which, in turn, may affect amounts reported in the consolidated financial statements.

Recent Accounting Pronouncements

The following is a summary of recent accounting pronouncements that have impacted or could potentially affect the Company**:**

ASU 2023-06 – On October 9, 2023, the FASB issued ASU 2023-06 “Disclosure Improvements: Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative.” The amendments in the ASU modify the disclosure or presentation requirements of a variety of topics in the codification. Certain of the amendments represent clarifications to, or technical corrections of, the current requirements. Each amendment in the ASU will only become effective if the SEC removes the related disclosure or presentation requirement from its existing regulations by June 30, 2027. The amendments in this ASU are not expected to have a material impact on the financial statements of the Company.

ASU 2023-09 – On December 14, 2023, the FASB issued ASU 2023-09 “Income Taxes (Topic 740): Improvements to Income Tax Disclosures”. The 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 5 percent of the amount computed by multiplying pretax income (or loss) by the applicable statutory income tax rate). The amendments 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 (national), 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 5 percent of total income taxes paid (net of refunds received). The amendments also require that all entities disclose the following information: (1) Income (or loss) from continuing operations before income tax expense (or benefit) disaggregated between domestic and foreign, and (2) Income tax expense (or benefit) from continuing operations disaggregated by federal (national), state, and foreign. The ASU 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. Retrospective application is permitted. The Company is required to adopt the expanded disclosure requirements of this ASU in its annual financial statements as of December 31, 2025, and does not expect the amendments to have a material impact to the financial statements of the Company.

ASU 2024-03 and ASU 2025-01 –On November 4, 2024, the FASB issued ASU 2024-03 “Income Statement—Reporting Comprehensive Income—Expense Disaggregation Disclosures (Subtopic 220-40): Disaggregation of Income Statement Expenses.” This ASU requires public companies to disclose, in the notes to financial statements, specified information about certain costs and expenses at each interim and annual reporting period. Specifically, they will be required to: (1) Disclose the amounts of (a) purchases of inventory; (b) employee compensation; (c) depreciation; (d) intangible asset amortization; and (e) depreciation, depletion, and amortization recognized as part of oil- and gas-producing activities (or other amounts of depletion expense) included in each relevant expense caption; (2) Include certain amounts that are already required to be disclosed under current generally accepted accounting principles (GAAP) in the same disclosure as the other disaggregation requirements; (3) Disclose a qualitative description of the amounts remaining in relevant expense captions that are not separately disaggregated quantitatively; and (4) Disclose the total amount of selling expenses and, in annual reporting periods, an entity’s definition of selling expenses. ASU 2024-03 is effective for public business entities for annual reporting periods beginning after December 15, 2026, and interim reporting periods within annual reporting periods beginning after December 15, 2027, which dates were clarified in ASU 2025-01, and is not expected to have a material impact on the financial statements of the Company.

ASU 2025-03 –On May 12, 2025, the FASB issued ASU 2024-03 “Business Combinations (Topic 805) and Consolidation (Topic 810): Determining the Accounting Acquirer in the Acquisition of a Variable Interest Entity.” This ASU revises current guidance for determining the accounting acquirer for a transaction effected primarily by exchanging equity interests in which the legal acquiree is a variable interest entity that meets the definition of a business. The amendments require an entity to consider the same factors that are currently required for determining which entity is the accounting acquirer in other acquisition transactions. This ASU is effective for annual reporting periods beginning after December 15, 2026, and interim reporting periods within those annual reporting periods. Early adoption is permitted in an interim or annual reporting period in which financial statements have not yet been issued (or made available for issuance). If an entity adopts ASU No. 2025-03 in an interim reporting period, it should adopt it as of the beginning of that interim reporting period or the beginning of the annual reporting period that includes that interim reporting period. An entity should apply ASU 2025-03 on a prospective basis to all business combinations that have an acquisition date that occurs on or after the date of initial application of ASU 2025-03. ASU 2025-03 is not expected to have a material impact on the financial statements of the Company.

Change in Significant Accounting Policies

Significant accounting policies are presented in Note 1 to the consolidated financial statements included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2024. These policies, along with the disclosures presented in the other financial statement notes and in this discussion, provide information on how significant assets and liabilities are valued in the consolidated financial statements and how those values are determined. During the second quarter of 2025, the Company had no changes to significant accounting policies or estimates.

Subsequent Events

Dividends

On July 15, 2025, our Board of Directors declared a cash dividend of $0.06 per share of common stock payable on August 4, 2025, to stockholders of record as of July 25, 2025; dividends of $3.2 million were paid to stockholders on August 4, 2025.

Merger with Bancorp Financial, Inc.

On July 1, 2025, the Company completed its previously announced merger with Bancorp Financial, pursuant to the agreement and plan of merger dated February 24, 2025. At the effective time of the merger, Bancorp Financial merged with and into the Company, with the Company continuing as the surviving corporation. Immediately following the merger, Evergreen Bank Group, an Illinois-chartered banking corporation and wholly owned subsidiary of Bancorp Financial, merged with and into Old Second National Bank (the “Bank”), a national banking association and wholly owned subsidiary of the Company, with the Bank continuing as the surviving bank. Under the terms of the merger agreement, each share of Bancorp Financial common stock outstanding immediately prior to the effective time was converted into the right to receive 2.5814 shares of Old Second common stock and $15.93 in cash, without interest, with cash paid in lieu of any fractional shares.

Note 2 – Acquisition

Completed Acquisitions

On December 6, 2024, the Company completed its purchase offive Illinois branch locations in the southeast Chicago metropolitan statistical area from First Merchants Bank (“FRME”), the wholly owned subsidiary of First Merchants Corporation. This acquisition brought increased scale as the Company expanded its current branch network in the Chicago market. At closing, the Company recorded $24.8 million of assets, including $7.1 million of loans and $3.9 million of premises and equipment, and $268.0 million of deposits, net of fair value adjustments.

The Company recorded the estimate of fair value based on initial valuations available at December 6, 2024. Estimated fair values are subject to adjustment for up toone year after December 6, 2024. Based on current valuations, $13.3 million of core deposit intangible was recorded. Goodwill of $6.8 million was ultimately recorded from the branch purchase transaction. None of the $6.8 million of goodwill recorded is expected to be deductible for income tax purposes.

The following table provides the purchase price allocation as of the December 6, 2024, branch purchase transaction with FRME, including the assets acquired and liabilities assumed at their estimated fair values as of that date, as recorded by the Company.

Expenses related to the FRME branch transaction totaled $168,000 and $1.9 million through the six months ended June 30, 2025, and the year ended December 31, 2024, respectively. The expenses related to the transaction are reported within noninterest expense based on the line items impacted, which are primarily salaries and employee benefits, computer and data processing, legal fees, and other expense in the Consolidated Statements of Income.

All acquired loans are considered non-PCD as none of the loans met the definition of a purchase credit deteriorated loan.

Note 3 – Securities

Investment Portfolio Management

Our investment portfolio serves the liquidity needs and income objectives of the Company. While the portfolio serves as an important component of the overall liquidity management at the Bank, portions of the portfolio also serve as income producing assets. The size and composition of the portfolio reflects liquidity needs, loan demand and interest income objectives. Portfolio size and composition will be adjusted from time to time. While a significant portion of the portfolio consists of readily marketable securities to address liquidity, other parts of the portfolio may reflect funds invested pending future loan demand or to maximize interest income without undue interest rate risk.

Investments are comprised of debt securities and non-marketable equity investments. Securities available-for-sale are carried at fair value. Unrealized gains and losses, net of tax, on securities available-for-sale are reported as a separate component of equity. This balance sheet component changes as interest rates and market conditions change. Unrealized gains and losses are not included in the calculation of regulatory capital.

Federal Home Loan Bank of Chicago (“FHLBC”) and Federal Reserve Bank of Chicago (“FRBC”) stock are considered nonmarketable equity investments. FHLBC stock was recorded at $4.2 million as of June 30, 2025, and $4.5 million as of December 31, 2024. FRBC stock was recorded at $14.9 million at June 30, 2025, and December 31, 2024. Our FHLBC stock is necessary to maintain access to FHLBC advances.

The following tables summarize the amortized cost and fair value of the securities portfolio at June 30, 2025, and December 31, 2024, and the corresponding amounts of gross unrealized gains and losses:

1 Excludes accrued interest receivable of*$7.3** million at June 30, 2025, and**$7.1** million at December 31, 2024, that is recorded in other assets on the Consolidated Balance Sheets.*

The fair value, amortized cost and weighted average yield of debt securities at June 30, 2025, by contractual maturity, are listed in the table below. Securities not due at a single maturity date are shown separately.

At June 30, 2025, the Company hadno securities issued from anyone originator, other than the U.S. Government and its agencies, which individually amounted to over 10% of the Company’s stockholders’ equity.

Securities with unrealized losses withno corresponding allowance for credit losses at June 30, 2025, and December 31, 2024, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, were as follows (in thousands except for number of securities):

Each quarter, we perform an analysis to determine if any of the unrealized losses on securities available-for-sale are comprised of credit losses as compared to unrealized losses due to market interest rate adjustments. Our assessment includes a review of the unrealized loss for each security issuance held; the financial condition and near-term prospects of the issuer, including external credit ratings and recent downgrades; and our ability and intent to hold the security for a period of time sufficient for a recovery in value. We also consider the extent to which the securities are issued by the federal government or its agencies, and any guarantee of issued amounts by those agencies. The portfolio continues to consist of a mix of fixed and floating-rate, high quality securities, largely rated AA (or better), displaying an overall effective duration of approximately 3.0 years. No credit losses were determined to be present as of June 30, 2025, as there was no credit quality deterioration noted. Therefore, no provision for credit losses on securities was recognized during 2025.

The following table presents net realized gains on securities available-for-sale for three months ended:

As of June 30, 2025, securities valued at $657.8 million were pledged for borrowings and for other purposes, a decrease from $717.5 million of securities pledged at year-end 2024.

Note 4 – Loans and Allowance for Credit Losses on Loans

Major segments of loans were as follows:

1* The “Other” segment includes consumer loans and overdrafts in this table and in subsequent tables within Note 4 – Loans and Allowance for Credit Losses on Loans.*

2* Excludes accrued interest receivable of**$17.7 million and**$17.5 million at June 30, 2025, and December 31, 2024, respectively, that is recorded in other assets on the Consolidated Balance Sheets.*

It is the policy of the Company to review each prospective credit prior to making a loan in order to determine if an adequate level of security or collateral has been obtained. The type of collateral, when required, will vary from liquid assets to real estate. The Company seeks to ensure access to collateral, in the event of borrower default, through adherence to lending laws, the Company’s lending standards and credit monitoring procedures. Although the Bank makes loans primarily within its market area, there are no significant concentrations of loans where the customers’ ability to honor loan terms is dependent upon a single economic sector. The real estate related categories listed above represent 68.5% and 67.2% of the portfolio at June 30, 2025, and December 31, 2024, respectively, and include a mix of owner occupied and non-owner occupied commercial real estate, residential, construction and multifamily loans.

The following tables represent the activity in the allowance for credit losses for loans, or the ACL, for the three and six months ended June 30, 2025 and 2024:

At June 30, 2025, our allowance for credit losses (“ACL”) on loans totaled $43.0 million, and our ACL on unfunded commitments, included in other liabilities, totaled $2.3 million. During the first six months of 2025, we recorded net provision for credit losses on loans and unfunded commitments of $4.9 million based on historical loss rate updates driven by higher charge-offs in the commercial portfolio, a slight downward change to the economic forecast, and the downgrade of two of credits, which conditions resulted in an increase to the pooled reserve which was offset by the specific reserves associated with the commercial charge-offs. The ACL on loans excludes an allowance for unfunded commitments of $2.3 million as of June 30, 2025, $1.9 million as of December 31, 2024, and $2.5 million as of June 30, 2024, which is recorded within other liabilities.

Generally, the Bank considers a loan to be collateral dependent when, based on current information and events, it is probable that foreclosure could be initiated. Additionally, the Bank will review all loans meeting the criteria for individual analysis, to determine if repayment or satisfaction of the loan is expected through the sale of collateral. This will generally be the case for credits with high loan-to-value ratios. Exceptions to this policy would include loans with guarantors or sponsors that have the means and willingness to support the obligation. Non-accruing loans with an outstanding balance of $500,000 or more are assessed on an individual loan level basis. When a financial asset is deemed collateral-dependent, the level of credit loss is measured by the difference between amortized cost of the financial asset and the fair value of collateral adjusted for estimated cost to sell. The Company had $28.6 million and $26.2 million of collateral dependent loans secured by real estate or business assets as of June 30, 2025, and December 31, 2024, respectively.

The following tables present the collateral dependent loans and the related ACL allocated by segment of loans as of June 30, 2025, and December 31, 2024:

Aged analysis of past due loans by segments of loans was as follows:

The table presents all nonaccrual loans as of June 30, 2025, and December 31, 2024:

The Company recognized $15,000 and $54,000 of interest on nonaccrual loans during the three months ended and six months ended June 30, 2025, respectively, and $2,000 and $36,000 of interest on nonaccrual loans during the three months ended and six months ended June 30, 2024, respectively.

Credit Quality Indicators

The Company categorizes loans into credit risk categories based on current financial information, overall debt service coverage, comparison to industry averages, historical payment experience, and current economic trends. This analysis includes loans with outstanding balances or commitments greater than $50,000 and excludes homogeneous loans such as home equity lines of credit and residential mortgages. Loans with a classified risk rating are reviewed quarterly regardless of size or loan type. The Company uses the following definitions for classified 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 at some future date.

**Substandard.**Loans classified as substandard are inadequately protected by the current net worth and paying capacity of the obligor or of the collateral pledged, if any. Loans so classified have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They are characterized by the distinct possibility that the Bank will sustain some loss if the deficiencies are not corrected. The substandard credit quality indicator includes both potential problem loans that are currently performing and nonperforming loans.

**Doubtful.**Loans classified as doubtful have all the weaknesses inherent in those classified as substandard, with the added characteristic that the weaknesses make collection or liquidation in full, on the basis of currently existing facts, conditions, and values, highly questionable and improbable.

Credits that are not covered by the definitions above are pass credits, which are not considered to be adversely rated.

Credit quality indicators by loan segment and loan origination date at June 30, 2025, were as follows: