Isabella Bank Corporation filed a Form 8-K on November 2, 2026, disclosing the completion of its merger with Grand River Commerce, Inc., a Michigan corporation, effective that same date.

Key Highlights

  • Merger closed November 2, 2026: Isabella Bank Corporation completed its acquisition of Grand River Commerce, Inc. under an Agreement and Plan of Merger originally dated June 11, 2026.
  • Two consideration options: Each Grand River share was convertible into either $5.71 in cash or 0.1413 shares of Isabella common stock, subject to proration procedures.
  • Proration split: According to the filing, 65% of Grand River shares were exchanged for Isabella common stock and 35% were exchanged for cash.
  • Three-step transaction structure: The deal involved an initial merger of Merger Sub into Grand River, a second-step merger of Grand River into Isabella, and a final bank-level merger of Grand River Bank into Isabella Bank.
  • Equity award treatment: Outstanding Grand River stock options were cancelled and converted to a cash payment based on the excess of $5.71 over each option's exercise price; restricted stock awards fully vested and received the Merger Consideration.
  • Press release issued: Isabella issued a press release on November 2, 2026, announcing completion of the transaction and the results of the Merger Consideration elections.

Isabella Bank Absorbs Grand River Commerce in Multi-Step Michigan Bank Merger

According to the filing, Isabella Bank Corporation (NASDAQ:ISBA), headquartered at 401 North Main Street, Mt. Pleasant, Michigan, completed its acquisition of Grand River Commerce, Inc. on November 2, 2026. The transaction proceeded in three stages: first, Isabella's wholly owned subsidiary, 401 Merger Sub, Inc., merged with and into Grand River, with Grand River surviving; immediately thereafter, Grand River merged with and into Isabella, with Isabella surviving; and finally, Grand River Bank merged with and into Isabella Bank, with Isabella Bank as the surviving bank.

The filing disclosed that each share of Grand River common stock (par value $0.01 per share) outstanding immediately prior to the effective time was converted into the right to receive either $5.71 in cash or 0.1413 shares of Isabella common stock, at the election of the holder. Cash was to be paid in lieu of any fractional shares. Elections were subject to proration procedures, with the filing stating that 65% of Grand River shares were exchanged for Isabella common stock and 35% were exchanged for cash.

Regarding Grand River equity awards, the filing states that each outstanding Grand River stock option was cancelled and converted into a cash payment equal to the number of shares subject to the option multiplied by the amount by which $5.71 exceeded the per-share exercise price, less applicable withholding taxes. Each Grand River restricted stock award fully vested at the effective time and was converted into the right to receive the Merger Consideration, less applicable withholding taxes. The filing noted that audited financial statements and pro forma financial information for Grand River were not required in this 8-K because substantially the same information had been previously filed in Isabella's Registration Statement on Form S-4 (File No. 333-297673), initially filed July 24, 2026 and declared effective August 10, 2026.

What Was Disclosed

Isabella Bank Corporation reported the November 2, 2026 completion of its merger with Grand River Commerce, Inc., including the three-step transaction structure, per-share consideration of $5.71 cash or 0.1413 Isabella shares, a 65%/35% stock-to-cash proration result, and the treatment of Grand River equity awards.