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Registrant’s telephone number, including area code 1.866.642.7736

Securities registered pursuant to Section 12(b) of the Act:

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.    Yes    x    No    o

Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit such files).    Yes    x    No    o

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, or an emerging growth company. See definition of "large accelerated filer", "accelerated filer", "smaller reporting company", and "emerging growth company" in Rule 12b-2 of the Exchange Act.

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.  o

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Act).    Yes    o    No    x

As of May 1, 2024, the registrant had 16,689,304 shares of common stock outstanding, par value $1.00 per share.

(1)The income tax impacts of the components of other comprehensive income are calculated using a 21% statutory tax rate.

(2)The change in defined benefit plans consists primarily of unrecognized actuarial (losses)/gains on defined benefit plans during the period.

(3)The reclassification adjustment for benefit plans includes settlement gains, amortization of prior service costs, and amortization of net gain or loss. Amounts are included in other income on the Consolidated Statements of Income within total noninterest income.

(1) The Corporation adopted ASU 2016-13 "Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments" effective January 1, 2023. See "Note 1 - Summary of Significant Accounting Policies" for further details.

Mid Penn Bancorp, Inc. ("Mid Penn" or the "Corporation"), through operations conducted by Mid Penn Bank (the "Bank") and its nonbank subsidiaries, engages in a full-service commercial banking and trust business, making available to the community a wide range of financial services, including, but not limited to, mortgage and home equity loans, secured and unsecured commercial and consumer loans, lines of credit, construction financing, farm loans, community development loans, loans to non-profit entities and local government loans, and various types of time and demand deposits including but not limited to, checking accounts, savings accounts, clubs, money market deposit accounts, certificates of deposit, and IRAs. In addition, the Bank provides a full range of trust and wealth management services through its Trust Department. Deposits are insured by the Federal Deposit Insurance Corporation ("FDIC") to the extent provided by law.

Mid Penn also fulfills the insurance needs of both existing and potential customers through MPB Risk Services, LLC, doing business as MPB Insurance and Risk Management.

The financial services are provided to individuals, partnerships, non-profit organizations, and corporations through its retail banking offices located in throughout Pennsylvania and two counties in New Jersey.

For all periods presented, the accompanying consolidated financial statements include the accounts of Mid Penn Bancorp, Inc., its wholly-owned subsidiary, Mid Penn Bank, and four nonbank subsidiaries, MPB Financial Services, LLC, which includes MPB Wealth Management, LLC (which ceased operating during the first quarter of 2024) and MPB Risk Services, LLC, and MPB Launchpad Fund I, LLC. As of March 31, 2024, the accounts and activities of these nonbank subsidiaries were not material to warrant separate disclosure or segment reporting. As a result, Mid Penn has only one reportable segment for financial reporting purposes. All material intercompany accounts and transactions have been eliminated in consolidation.

Certain information and disclosures normally included in consolidated financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to the rules and regulations of the SEC. Mid Penn believes the information presented is not misleading, and the disclosures are adequate. For comparative purposes, the March 31, 2023 and December 31, 2023 balances have been reclassified, when necessary, to conform to the 2024 presentation. Such reclassifications had no impact on net income or total shareholders’ equity. In the opinion of management, all adjustments necessary for fair presentation of the periods presented have been reflected in the accompanying consolidated financial statements. All such adjustments are of a normal, recurring nature. These unaudited interim consolidated financial statements should be read in conjunction with the audited consolidated financial statements and notes thereto included in the 2023 Annual Report.

Mid Penn has evaluated events and transactions occurring subsequent to the balance sheet date of March 31, 2024, for items that should potentially be recognized or disclosed in these consolidated financial statements. The evaluation was conducted through the issuance date of these consolidated financial statements.

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 consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could materially differ from those estimates.

Material estimates subject to significant change include the allowance for credit losses, the expected cash flows and collateral values associated with loans that are individually evaluated for credit losses, the carrying value of other real estate owned ("OREO"), the fair value of financial instruments, business combination fair value computations, the valuation of goodwill and other intangible assets, stock-based compensation and deferred income tax assets.

On January 1, 2023, the Corporation adopted ASU 2016-13, Financial Instruments - Credit Losses (ASC Topic 326): Measurement of Credit Losses on Financial Instruments, which replaced the incurred loss methodology, and is referred to as CECL. The measurement of expected credit losses under CECL is applicable to financial assets measured at amortized cost, including loans and HTM debt securities. It also applies to OBS credit exposures (loan commitments, standby letters of credit, financial guarantees, and other similar instruments) and net investments in leases recognized by a lessor in accordance with ASC Topic 842. Prior to 2024, the provision for OBS credit losses was included in Other Expenses on the Statement of Income. As of March 31, 2024, the provision for OBS credit losses is included in Provision for Credit Losses on the Income Statement. Prior periods have been updated for presentation.

All other significant accounting policies used in preparation of the Consolidated Financial Statements are disclosed in the 2023 Annual Report. Those significant accounting policies are unchanged at March 31, 2024.

ASU No. 2023-02: The FASB issued ASU 2023-02, Investments - Equity Method and Joint Ventures (Topic 323): Accounting for Investments in Tax Credit Structures Using the Proportional Amortization Method.

The amendments in this update permit reporting entities to elect to account for their tax equity investments, regardless of the tax credit program from which the income tax credits are received, using the proportional amortization method if certain conditions are met. A reporting entity may make an accounting policy election to apply the proportional amortization method on a tax-credit-program-by-tax-credit-program basis rather than electing to apply the proportional amortization method at the reporting entity level or to individual investments. The amendments in this update also remove certain guidance for Qualified Affordable Housing Project investments and require the application of the delayed equity contribution guidance to all tax equity investments. The amendments in this update are effective for fiscal years beginning after December 15, 2023, and must be applied on either a modified retrospective or a retrospective basis. Early adoption is permitted in any interim period, however if adopted in an interim period the entity shall adopt the amendments in this update as of the beginning of the fiscal year that includes the interim period. The Corporation does not expect the adoption of ASU No. 2023-02 to have a material impact on its consolidated financial statements.

ASU 2023-06: The FASB issued ASU 2023-06, Disclosure Improvements - Codification Amendments in Response to the SEC’s Disclosure Update and Simplification Initiative.

ASU 2023-06 amends the ASC to incorporate certain disclosure requirements from SEC Release No. 33-10532 - Disclosure Update and Simplification that was issued in 2018. The effective date for each amendment will be the date on which the SEC’s removal of that related disclosure from Regulation S-X or Regulation S-K becomes effective, with early adoption prohibited. ASU 2023-06 is not expected to have a significant impact on our financial statements.

ASU 2023-07: The FASB issued ASU 2023-07, Segment Reporting (Topic 280): Improvements to Reportable Segment Disclosures

ASU 2023-07 amends the ASC to improve reportable segment disclosure requirements, primarily through enhanced disclosures about significant segment expenses. 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. Early adoption is permitted. ASU 2023-07 is not expected to have a significant impact on our financial statements.

ASU 2023-09: The FASB issued ASU 2023-09, Income Taxes (Topic 740): Improvements to Income Tax Disclosures

ASU 2023-09 amends the ASC to enhance income tax disclosures by requiring entities to disclose income taxes paid (net of refunds received) disaggregated by federal, state and foreign taxes. Additionally, entities are required to disclose amounts greater than 5% of the total income taxes paid to an individual jurisdiction The amendments are effective for annual periods beginning after December 15, 2025. ASU 2023-09 is not expected to have a significant impact on our financial statements.

ASU 2024-01—The FASB issued ASU 2024-01, Compensation - Stock Compensation (Topic 718): Scope application of profits interest and similar awards

The amendments in the ASU apply to all reporting entities that account for profits interest awards as compensation to employees or nonemployees in return for goods or services. The amendments are effective for annual periods beginning after December 15, 2025, and interim periods within those annual periods. ASU 2024-01 is not expected to have a significant impact on our financial statements.

ASU 2024-02: The FASB issued ASU 2024-02, Codification Improvements—Amendments to Remove References to the Concepts Statements

This ASU contains amendments to the Codification that remove references to various FASB Concepts Statements. The amendments are effective for fiscal years beginning after Dec. 15, 2025. Early adoption is permitted. ASU 2024-02 is not expected to have a significant impact on our financial statements.

Brunswick Acquisition

On May 19, 2023, Mid Penn completed its acquisition of Brunswick through the merger of Brunswick with and into Mid Penn with Mid Penn being the surviving corporation. In connection with this acquisition, Brunswick Bank, a wholly-owned subsidiary of Brunswick, merged with and into Mid Penn Bank, a wholly-owned subsidiary of Mid Penn.

This transaction included the acquisition of 5 branches and extended Mid Penn’s footprint into Middlesex and Monmouth counties in central New Jersey. Mid Penn issued 849,510 shares of its common stock as well as a net cash payment to Brunswick shareholders of $27.6 million, for total consideration of $45.7 million for all outstanding stock and the cancellation of stock options of Brunswick.

Mid Penn has recognized total goodwill of $12.8 million, which is calculated as the excess of both the consideration exchanged and liabilities assumed compared to the fair market value of identifiable assets acquired. The fair value of the consideration exchanged related to Mid Penn’s common stock was calculated based upon the closing market price of Mid Penn’s common stock as of May 19, 2023. None of the goodwill recognized is expected to be deductible for income tax purposes.

Purchased loans and leases that reflect a more-than-insignificant deterioration of credit from origination are considered PCD. Mid Penn considers various factors in connection with the identification of more-than-insignificant deterioration in credit, including but not limited to nonperforming status, delinquency, risk ratings, FICO scores and other qualitative factors that indicate deterioration in credit quality since origination. For PCD loans and leases, the initial estimate of expected credit losses is recognized in the ACL on the date of acquisition using the same methodology as other loans and leases held-for-investment. As part of the Brunswick Acquisition, Mid Penn acquired PCD loans and leases of $18.7 million. Mid Penn established an ACL at acquisition of $336 thousand with a corresponding gross-up to the amortized cost of the PCD loans and leases. The non-credit discount on the PCD loans and leases was $2.4 million and the Day 1 fair value was $16.3 million. The initial provision expense for non-PCD loans associated with the Brunswick Acquisition was $2.0 million.

Estimated fair values of the assets acquired and liabilities assumed in the Brunswick Acquisition as of the closing date are as follows:

Management has completed its evaluation of fair values of all assets and liabilities shown in the table above and all amounts are considered final.

FASB ASU 2016-13, "Financial Instruments-Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments," was adopted by Mid Penn on January 1, 2023. ASU 2016-13 introduces the CECL methodology for estimating allowances for credit losses. ASU 2016-13 applies to all financial instruments carried at amortized cost, including HTM securities, and makes targeted improvements to the accounting for credit losses on AFS securities.

In order to comply with ASC 326, Mid Penn conducted a review of its investment portfolio and determined that for certain classes of securities it would be appropriate to assume the expected credit loss to be zero. This zero-credit loss assumption applies to debt issuances of the U.S. Treasury and agencies and instrumentalities of the United States government. The reasons behind the adoption of the zero-credit loss assumption are as follows:

•High credit rating

•Long history with no credit losses

•Guaranteed by a sovereign entity

•Widely recognized as "risk-free rate"

•Can print its own currency

•Currency is routinely held by central banks, used in international commerce, and commonly viewed as reserve currency

•Currently under the U.S. Government conservatorship or receivership

Mid Penn will continuously monitor any changes in economic conditions, credit downgrades, changes to explicit or implicit guarantees granted to certain debt issuers, and any other relevant information that would indicate potential credit deterioration and prompt Mid Penn to reconsider its zero-credit loss assumption.

At the date of adoption, Mid Penn’s estimated allowance for credit losses on AFS and HTM securities under ASU 2016-13 was deemed immaterial due to the composition of these portfolios. Both portfolios consist primarily of U.S. government agency guaranteed mortgage-backed securities for which the risk of loss is minimal. Therefore, Mid Penn did not recognize a cumulative effect adjustment through retained earnings related to the AFS and HTM securities.

ASU 2016-13 makes targeted improvements to the accounting for credit losses on AFS securities. The concept of other-than-temporarily impaired has been replaced with the allowance for credit losses. Unlike HTM securities, AFS securities are evaluated on an individual level and pooling of securities is not allowed.

Quarterly, Mid Penn evaluates if any security has a fair value less than its amortized cost. Once these securities are identified, in order to determine whether a decline in fair value resulted from a credit loss or other factors, Mid Penn performs further analysis as outlined below:

•Review the extent to which the fair value is less than the amortized cost and observe the security’s lowest credit rating as reported by third-party credit ratings companies.

•The securities that violate the credit loss triggers above would be subjected to additional analysis that may include, but is not limited to: changes in market interest rates, changes in securities credit ratings, security type, service area economic factors, financial performance of the issuer/or obligor of the underlying issue and third-party guarantee.

•If Mid Penn determines that a credit loss exists, the credit portion of the allowance will be measured using a DCF analysis using the effective interest rate as of the security’s purchase date. The amount of credit loss Mid Penn records will be limited to the amount by which the amortized cost exceeds the fair value.

The DCF analysis utilizes contractual maturities, as well as third-party credit ratings and cumulative default rates published annually by a reputable third-party.

At March 31, 2024, the results of the analysis did not identify any securities that violate the credit loss triggers; therefore, no DCF analysis was performed and no credit loss was recognized on any of the securities available for sale.

Accrued interest receivable is excluded from the estimate of credit losses for AFS securities. At March 31, 2024, accrued interest receivable totaled $982 thousand for AFS securities and was reported in accrued interest receivable on the accompanying Consolidated Balance Sheet.

ASU 2016-13 requires institutions to measure expected credit losses on financial assets carried at amortized cost on a collective or pool basis when similar risks exist. Mid Penn uses several levels of segmentation in order to measure expected credit losses:

•The portfolio is segmented into agency and non-agency securities.

•The non-agency securities are separated into state and political subdivision obligations and corporate debt securities.

Each individual segment is categorized by third-party credit ratings.

As discussed above, Mid Penn has determined that for certain classes of securities it would be appropriate to assume the expected credit loss to be zero, which include debt issuances of the U.S. Treasury and agencies and instrumentalities of the United States government. This assumption will be reviewed and attested to quarterly.

At March 31, 2024, Mid Penn’s HTM securities totaled $397.0 million. After applying appropriate probability of default and loss given default assumptions, the total amount of current expected credit losses was deemed immaterial. Therefore, no reserve was recorded at March 31, 2024.

Accrued interest receivable is excluded from the estimate of credit losses for HTM securities. At March 31, 2024, accrued interest receivable totaled $2.2 million for HTM securities and was reported in accrued interest receivable on the accompanying Consolidated Balance Sheet.

At March 31, 2024, Mid Penn had no HTM securities that were past due 30 days or more as to principal or interest payments. Mid Penn had no HTM securities classified as nonaccrual at March 31, 2024.

The amortized cost and estimated fair value of investment securities for the periods presented:

Estimated fair values of debt securities are based on quoted market prices, where applicable. If quoted market prices are not available, fair values are based on quoted market prices of instruments of a similar type, credit quality and structure, adjusted for differences between the quoted instruments and the instruments being valued. See "Note 8 - Fair Value Measurement," for additional information.

Investment securities having a fair value of $383.9 million at March 31, 2024 and $380.3 million at December 31, 2023 were pledged to secure public deposits, some Trust department deposit accounts, and certain other borrowings. In accordance with legal provisions for alternatives other than pledging of investments, Mid Penn also obtains letters of credit from the FHLB to secure certain public deposits. These FHLB letter of credit commitments totaled $142.9 million as of March 31, 2024 and $153.5 million as of December 31, 2023.

The following tables present gross unrealized losses and fair value of debt investment securities aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position for the periods presented: