UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): ~~February~~March 2623, 2026

ISABELLA BANK CORPORATION

(Exact name of registrant as specified in its charter)

Michigan

000-18415

38-2830092

(State or other jurisdiction
of incorporation)

(Commission
File Number)

(IRS Employer
Identification No.)

401 North Main Street

Mt. Pleasant

Michigan

48858-1649

(Address of principal executive offices)

(Zip Code)

Registrant’s telephone number, including area code: (989) 772-9471

Not Applicable

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:


☐			Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)


☐			Soliciting material pursuant to Rule l4a-12 under the Exchange Act (17 CFR 240.l4a-l2)


☐			Pre-commencement communications pursuant to Rule l4d-2(b) under the Exchange Act (17 CFR 240.l4d-2(b))


☐			Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.l3e-4(c))

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


Title of each class	Trading Symbol(s)	Name of each exchange on which registered
Common stock, no par value per share	ISBA	The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).


			Emerging 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 any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Section 85 - ~~Other~~Corporate ~~Events~~Governance and Management

Item 85.0102 ~~Other~~Departure ~~Events~~of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

(b) On ~~February 26~~March 23, 2026, ~~Isabella~~Jae ~~Bank~~A. ~~Corporation~~Evans ~~issued~~resigned afrom ~~press~~the ~~release~~Isabella ~~announcing~~Bank ~~that~~Corporation ~~its~~(the “Corporation”) Board of Directors ~~declared~~and athe ~~twenty-eight~~Board ~~cent~~of ~~($0.28)~~Directors ~~per~~of ~~common~~Isabella ~~share~~Bank, ~~first~~the ~~quarter~~Corporation’s ~~cash dividend~~subsidiary, ~~payable~~effective ~~March 31,~~as ~~2026~~of tothe ~~shareholders~~close of ~~record~~business ason of March 27 23, 2026.

AThere ~~copy~~is no disagreement, known to an executive officer of the ~~press~~Corporation, ~~release~~as isdefined ~~filed~~in as17 ~~Exhibit~~CFR 99240.13b-7, tobetween ~~this~~the ~~Form~~Corporation ~~8-K~~ and isMr. ~~incorporated~~Evans ~~herein~~on byany ~~reference~~matter relating to the Corporation’s operations, policies, or practices.

The information in this Item 8.01 of Form 8-K and Exhibit 99.1 attached hereto shall not be deemed "filed" for purposes of Section 18 of the Securities Exchange Act of 1934, nor shall it be deemed incorporated by reference in any filing made by the registrant under the Securities Act of 1933, whether made before or after the date hereof, except as shall be expressly set forth by specific reference in such filing.

Section 9 - Financial Statements and Exhibits

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits:

ExhibitNo.						Description
99.1						Press release issued February 26, 2026
104						Cover page interactive data file - the cover page XBRL tags are embedded within the inline XBRL document

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

ISABELLA BANK CORPORATION

Dated:

~~February~~March 2625, 2026

By:

/s/ Gerald J. Ritzert

Gerald J. Ritzert, CFO

Gerald J. Ritzert, Chief Financial Officer

INDEX TO EXHIBITS

ExhibitNo.						Description
99.1						Press release issued February 26, 2026
104						Cover page interactive data file - the cover page XBRL tags are embedded within the inline XBRL document

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