Isabella Bank Corp 2025年度报告

ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 OR Securities registered pursuant to Section 12(b) of the Act: Indicated by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405 of the Securities Act.☐Yes☒No Indicate by check mark whether the registrant (1)has filed all reports required to be filed by Section13 or 15(d) of the Securities Exchange Act of1934 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 suchfiling requirements for the past 90 days.☒Yes☐No Indicate by check mark whether the registrant has submitted electronically every Interactive Data File required to be submitted pursuant to Rule 405of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submitsuch files).☒Yes☐No Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, a smaller reporting company, oran emerging growth company. See definition of “large accelerated filer,” “accelerated filer,” “smaller reporting company,” and “emerging growthcompany” in Rule 12b-2 of the Exchange Act. Largeacceleratedfiler☐Non-accelerated filer☐ Accelerated filerSmallerreportingcompanyEmerging growth company If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with anynew or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act.☐ Indicate by check mark whether the registrant has filed a report on and attestation to its management’s assessment of the effectiveness of its internalcontrol over financial reporting under Section 404(b) of the Sarbanes-Oxley Act (15 U.S.C. 7262(b)) by the registered public accounting firm thatprepared or issued its audit report.☒ If securities are registered pursuant to Section 12(b) of the Act, indicate by check mark whether the financial statements of the registrant included inthe filing reflect the correction of an error to previously issued financial statements.☐ Indicate by check mark whether any of those error corrections are restatements that required a recovery analysis of incentive-based compensationreceived by any of the registrant’s executive officers during the relevant recovery period pursuant to§240.10D-1(b).☐ Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).☐Yes☒No The aggregate market value of the voting stock held by non-affiliates of the registrant was $217,706,000 as of the last business day of the registrant’smost recently completed second fiscal quarter. The number of common shares outstanding of the registrant’s Common Stock (no par value) was 7,330,036 as of March12, 2026. DOCUMENTS INCORPORATED BY REFERENCE(Such documents are incorporated herein only to the extent specifically set forth in response to an item herein.) ISABELLA BANK CORPORATIONANNUAL REPORT ON FORM 10-KTable of Contents PART I BusinessRisk FactorsUnresolved Staff CommentsCybersecurityPropertiesLegal ProceedingsMine Safety Disclosures Item 1.Item 1A.Item 1B.Item 1C.Item 2.Item 3.Item 4. PART II Market for Registrant’s Common Equity, Related Stockholder Matters and Issuer Purchases ofEquity Securities25[Reserved]26Management’s Discussion and Analysis of Financial Condition and Results of Operations27Quantitative and Qualitative Disclosures About Market Risk42Financial Statements and Supplementary Data43Changes in and Disagreements With Accountants on Accounting and Financial Disclosure102Controls and Procedures102Other Information102Disclosure Regarding Foreign Jurisdictions that Prevent Inspections102 PART III Directors, Executive Officers and Corporate Governance103Executive Compensation103Security Ownership of Certain Beneficial Owners and Management and Related StockholderMatters103Certain Relationships and Related Transactions, and Director Independence103Principal Accountant Fees and Services103 Glossary of Acronyms and Abbreviations The acronyms and abbreviations identified below may be used throughout this Annual Report on Form 10-K or in our other SECfilings. You may find it helpful to refer back to this page while reading this report. Table of Contents Forward-Looking Statements This Annual Report on Form 10-K contains statements that we believe are “forward-looking statements” within the meaning ofSection27A of the Securities Act and Section21E of the Exchange Act. These forward-looking statements reflect our current viewswith respect to, among other things, future events and our financial performance. These statements are often, but not always, madethrough the use of words or phrases such as “may,” “might,” “should,” “could,” “predict,” “potential,” “believe,” “expect,” “continue,”“will,” “likely,” “anticipate