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ISABELLA BANK CORP

For the period ended Dec 31, 2025. Filed Mar 13, 2026.

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A company's yearly report to the SEC, with audited financial statements. It is the fullest account a company gives of its business, its finances and the risks it sees.

FY2025 · Filed Mar 13, 2026

ISBA$40.70-1.1%Stored close · as of Nov 10, 2026

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Item 15. Exhibit and Financial Statement Schedules

(a)(1)Financial Statements: The following documents are filed as part of Item 8 of this report:
Report of Independent Registered Public Accounting Firm, Plante & Moran, PLLC (PCAOB ID: 166)
Report of Independent Registered Public Accounting Firm, Rehmann Robson LLC (PCAOB ID: 263)
Consolidated Balance Sheets
Consolidated Statements of Income
Consolidated Statements of Comprehensive Income (Loss)
Consolidated Statements of Changes in Shareholders’ Equity
Consolidated Statements of Cash Flows
Notes to Consolidated Financial Statements
(2)Financial Statement Schedules: All schedules are omitted because they are neither applicable nor required, or because the required information is included in the consolidated financial statements or related notes.
(3)See the exhibits listed below under Item 15(b):
(b)The following exhibits required by Item 601 of Regulation S-K are filed as part of this report:
3.1Amended Articles of Incorporation (1)
3.2Amendment to the Articles of Incorporation (2)
3.3Amendment to the Articles of Incorporation (3)
3.4Amendment to the Articles of Incorporation (4)
3.5Amendment to the Articles of Incorporation (5)
3.6Second Amended and Restated Bylaws, as amended on September 24, 2025 (6)
4.1Indenture, dated June 2, 2021, by and between Isabella Bank Corporation and UMB Bank, National Association, as trustee (7)
4.2Form of 3.25% Fixed to Floating Rate Subordinated Note due 2031 (8)
10.1Isabella Bank Corporation and Related Companies Deferred Compensation Plan for Directors* (9)
10.2Isabella Bank Corporation Retirement Bonus Plan* (10)
10.3Isabella Bank Corporation Split Dollar Plan* (11)
10.4Second Amended and Restated Isabella Bank Corporation Supplemental Executive Retirement Plan, as amended on January 1, 2025* (12)
10.5Isabella Bank Corporation Restricted Stock Plan* (13)
10.6Isabella Bank Corporation Executive Cash Incentive Plan* (14)
10.7Isabella Bank Corporation Executive Clawback Policy* (15)
10.8Form of Subordinated Note Purchase Agreement, dated as of June 2, 2021, by and among the Corporation and the several Purchasers (16)
10.9Form of Registration Rights Agreement, dated as of June 2, 2021, by and among the Corporation and the several Purchasers (17)
19Isabella Bank Corporation Directors and Executive Officers Operating Policy on Trading in ISBA Common Stock (18)
21Subsidiaries of the Registrant
23.1Consent of Rehmann Robson LLC, Independent Registered Public Accounting Firm
23.2Consent of Plante & Moran, PLLC, Independent Registered Public Accounting Firm
31.1Certification pursuant to section 302 of the Sarbanes-Oxley Act of 2002 by the Chief Executive Officer
31.2Certification pursuant to section 302 of the Sarbanes-Oxley Act of 2002 by the Chief Financial Officer
32Section 1350 Certification of Chief Executive Officer and Chief Financial Officer
101.INSXBRL Interactive Data File**
101.SCHXBRL Interactive Data File**
101.CALXBRL Interactive Data File**
101.LABXBRL Interactive Data File**
101.PREXBRL Interactive Data File**
101.DEFXBRL Interactive Data File**
104Cover Page Interactive Data File
*Management Contract or Compensatory Plan or Arrangement.
**As provided by Rule 406T in Regulation S-T, this information is furnished and not filed for purposes of Sections 11 and 12 of the Securities Act of 1933 and Section 18 of the Exchange Act
(1)Previously filed as Exhibit 3(d) to of the Corporation’s Annual Report on Form 10-K filed with the SEC on March 27, 2001, and incorporated herein by reference.
(2)Previously filed as an Exhibit to the Isabella Bank Corporation Form 10-K, filed March 26, 1994, and incorporated herein by reference.
(3)Previously filed as an Exhibit to Isabella Bank Corporation Form 10-K, filed March 22, 2000, and incorporated herein by reference.
(4)Previously filed as Exhibit 3(d) to of the Corporation’s Annual Report on Form 10-K filed with the SEC on March 27, 2001, and incorporated herein by reference.
(5)Previously filed as Exhibit 3.1 of the Corporation’s Current Report on Form 8-K filed with the SEC on May 16, 2008, and incorporated herein by reference.
(6)Previously filed as Exhibit 3.1 of the Corporation’s Current Report on Form 8-K filed with the SEC on September 30, 2025, and incorporated herein by reference.
(7)Previously filed as Exhibit 4.1 to the Corporation’s Current Report on Form 8-K filed with the SEC on June 2, 2021, and incorporated herein by reference.
(8)Included as Exhibit A-1 to the Indenture incorporated herein by reference as Exhibit 4.1 hereto.
(9)Previously filed as Exhibit 10.1 of the Corporation’s Current Report on Form 8-K filed with the SEC on March 13, 2019, and incorporated herein by reference.
(10)Previously filed as Exhibit 10.1 of the Corporation’s Current Report on Form 8-K filed with the SEC on December 19, 2008, and incorporated herein by reference.
(11)Previously filed as Exhibit 10.1 of the Corporation’s Current Report on Form 8-K filed with the SEC on March 31, 2015, and incorporated herein by reference.
(12)Previously filed as Exhibit 10.2 of the Corporation’s Current Report on Form 8-K filed with the SEC on April 7, 2025, and incorporated herein by reference.
(13)Previously filed as Exhibit 10.6 of the Corporation’s Current Report on Form 8-K filed with the SEC on April 1, 2024, and incorporated herein by reference.
(14)Previously filed as Exhibit 10.5 of the Corporation’s Current Report Form 8-K filed with the SEC on April 1, 2024, and incorporated herein by reference.
(15)Previously filed as Exhibit 10.1 to the Corporation’s Current Report on Form 8-K filed with the SEC on April 1, 2024, and incorporated herein by reference.
(16)Previously filed as Exhibit 10.1 to the Corporation’s Current Report on Form 8-K filed with the SEC on June 2, 2021, and incorporated herein by reference.
(17)Previously filed as an Exhibit 10.2 to the Corporation’s Current Report on Form 8-K filed with the SEC on June 2, 2021, and incorporated herein by reference.
(18)Previously filed as an Exhibit 19 to the Corporation’s Annual Report on Form 10-K filed with the SEC on March 13, 2025, and incorporated herein by reference.
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