Company: ISBA
Filing Date: 2025-05-08
Form Type: 8-A12B
Source: 0000842517-25-000102
Chunk: 3

Company: ISABELLA BANK CORP
Filing Date: 2025-05-08
Form: 8-A12B
Chunk 3
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BA require the affirmative vote of at least 66 2/3% of all issued and outstanding common stock entitled to vote on certain business combinations, including, but not limited to, any merger, consolidation, recapitalization, reclassification, liquidation or dissolution in which ISBA is a party thereto, or the sale or disposition of substantially all of the property and assets of ISBA.

• Amendments to Articles of Incorporation and Bylaws. Amendments to the Articles of Incorporation must be approved by at least 66 2/3% of the issued and outstanding shares of ISBA’s voting stock. The Bylaws may be amended by a two-thirds vote of the Board of Directors of ISBA or the affirmative vote of a majority of the shares of our common stock in attendance at a duly constituted meeting of shareholders. However, any amendment that relates to the classified board provisions of the Bylaws requires the approval of the holders of at least a majority of outstanding shares.

#### Transfer Agent and Registrar
The transfer agent and registrar for our common stock is Isabella Bank.

## Item 2. Exhibits
In accordance with the “Instructions as to Exhibits” for Form 8-A, no exhibits are required to be filed because no other securities of the Registrant are registered on the Nasdaq Stock Market LLC, and the securities registered hereby are not being registered pursuant to Section 12(g) of the Securities Exchange Act of 1934, as amended.

### SIGNATURE
Pursuant to the requirements of Section 12 of the Securities Exchange Act of 1934, the registrant has duly caused this registration statement to be signed on its behalf by the undersigned, thereto duly authorized.

| Date: |     | May 8, 2025 |     | ISABELLA BANK CORPORATION 
 By:                       |     | /s/ William M. Schaefer |
|:------|:----|:------------|:----|:--------------------------|:----|:------------------------|
|       |     |             |     |                           |     | William M. Schaefer     |
|       |     |             |     |                           |     | Chief Financial Officer |