ISBA provides Q3 2025 results press release as Exhibit 99.1

Rhea-AI Filing Summary

Isabella Bank Corporation furnished an update on its business by announcing it issued a press release with financial results for the quarter ended September 30, 2025. The disclosure was made in a Form 8-K under Item 2.02.

The press release is provided as Exhibit 99.1 and, consistent with General Instruction B.2, is furnished and not deemed filed. Isabella Bank’s common stock trades on Nasdaq under the symbol ISBA.

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

 FORM 8-K

CURRENT REPORT

Pursuant to Section 13 OR 15(d) of The Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): October 27, 2025

ISABELLA BANK CORPORATION

(Exact name of registrant as specified in its charter)

Michigan

000-18415

38-2830092

(State or other jurisdiction of incorporation)

(Commission File Number)

(IRS Employer Identification No.)

401 North Main Street

Mt. Pleasant

Michigan

48858-1649

(Address of principal executive offices)

(Zip Code)

Registrant’s telephone number, including area code: (989) 772-9471

Not Applicable

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule l4a-12 under the Exchange Act (17 CFR 240.l4a-l2)

☐ Pre-commencement communications pursuant to Rule l4d-2(b) under the Exchange Act (17 CFR 240.l4d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.l3e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of each class			Trading Symbol(s)			Name of each exchange on which registered
Common stock, no par value per share			ISBA			The Nasdaq Stock Market LLC

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Section 2 - Financial Information

Item 2.02 Results of Operations and Financial Condition.

On October 27, 2025, Isabella Bank Corporation issued a press release announcing its financial results for the quarter ended September 30, 2025.

A copy of the press release is furnished as Exhibit 99.1 to this Current Report on Form 8-K and is incorporated herein by reference.

In accordance with General Instruction B.2 of Form 8-K, the information in Item 2.02 of this Current Report on Form 8-K, including Exhibit 99.1 furnished herewith, shall not be deemed “filed” for purposes of Section 18 of the Securities Exchange Act of 1934, as amended (the "Exchange Act"), or otherwise subject to the liabilities of that section, nor will any of such information be deemed incorporated by reference into any filing made by the registrant under the Securities Act of 1933, as amended, or the Exchange Act, except as shall be expressly set forth by specific reference in such filing or document.

Section 9 - Financial Statements and Exhibits

Item 9.01 Financial Statements and Exhibits.

(d) Exhibits:

Exhibit No.						Description
99.1						Press release issued by Isabella Bank Corporation, dated October 27, 2025
104						Cover page interactive data file - the cover page XBRL tags are embedded within the inline XBRL document

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

ISABELLA BANK CORPORATION

Dated:

October 27, 2025

By:

/s/ Jerome E. Schwind

Jerome E. Schwind, President & CEO

FAQ

What did Isabella Bank (ISBA) announce in this 8-K?

The company furnished a press release announcing financial results for the quarter ended September 30, 2025.

Which 8-K item applies to ISBA’s disclosure?

Item 2.02, Results of Operations and Financial Condition.

Where can I find the press release for ISBA’s Q3 2025 results?

It is included as Exhibit 99.1 to the Form 8-K.

Is the ISBA press release considered filed with the SEC?

No. Under General Instruction B.2, it is furnished and not deemed filed.

What is Isabella Bank’s trading symbol and exchange?

The common stock trades on The Nasdaq Stock Market LLC under the symbol ISBA.

What period do the furnished results cover for ISBA?

The quarter ended September 30, 2025.