Isabella Bank sets Oct 23 election deadline for Grand River merger; cash consideration ~$5.71/share

ISABELLA BANK CORP

Grand River shareholders must submit Election Form to Continental Stock Transfer & Trust by 5:00 p.m. ET on Friday, October 23, 2026, to elect cash or Isabella common stock.
Election materials mailed on/about September 28, 2026 to holders of record as of September 24, 2026.
Each Grand River share converts into either cash (estimated ~$5.71 per share) or Isabella common stock at an estimated exchange ratio of 0.1413, subject to proration.
Cash consideration pool is $18,262,391; exchange ratio uses 839,003 Isabella shares, based on assumed 9,136,529 Grand River shares outstanding at closing.
Merger remains subject to regulatory approvals and customary closing conditions; parties expect to complete the deal in Q4 2026.

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