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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$41.14+1.2%Stored close · as of Nov 9, 2026

Extracted filing text, with the paragraph anchors used by the comparison.

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Item 16. Form 10-K Summary

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

ISABELLA BANK CORPORATION

(Registrant)

By:/s/ Jerome E. SchwindDate:March 13, 2026
Jerome E. Schwind, President and Chief Executive Officer
(Principal Executive Officer)

Pursuant to the requirements of the Securities Exchange Act of 1934, this report has been signed below by the following persons on behalf of the registrant and in the capacities and on the dates indicated.

SignaturesCapacityDate
/s/ Dr. Jeffrey J. BarnesDirectorMarch 13, 2026
Dr. Jeffrey J. Barnes
/s/ David B. BehenDirectorMarch 13, 2026
David B. Behen
/s/ Jill BourlandDirectorMarch 13, 2026
Jill Bourland
/s/ Melinda M. CoffinDirectorMarch 13, 2026
Melinda M. Coffin
/s/ Jae A. EvansDirectorMarch 13, 2026
Jae A. Evans
/s/ Jennifer L. GillControllerMarch 13, 2026
Jennifer L. Gill
/s/ Neil M. McDonnellIsabella Bank President and DirectorMarch 13, 2026
Neil M. McDonnell
/s/ Sarah R. OppermanDirectorMarch 13, 2026
Sarah R. Opperman
/s/ Gerald J. RitzertChief Financial Officer (Principal Financial Officer)March 13, 2026
Gerald J. Ritzert
/s/ Vicki L. RuppDirectorMarch 13, 2026
Vicki L. Rupp
/s/ Brian R. SackettDirectorMarch 13, 2026
Brian R. Sackett
/s/ Jerome E. SchwindPresident, Chief Executive Officer(Principal Executive Officer), and DirectorMarch 13, 2026
Jerome E. Schwind
/s/ Brian B. TessinDirectorMarch 13, 2026
Brian B. Tessin
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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.