Isabella Bank Board approves amended bylaws with exclusive-forum and governance updates

ISABELLA BANK CORP

Board adopted Second Amended and Restated Bylaws on Sept 24, 2025, effective immediately.
Adds exclusive forum provision for certain shareholder lawsuits against the corporation.
Establishes procedures for shareholder proposals, director nominations, and nominee questionnaires.
Permits remote electronic participation for shareholder and board meetings per Michigan law.

item 5.03item 9.01

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