Isabella Bank director awarded 46 shares at $38.55

ISABELLA BANK CORP (ISBA) reported that director Sarah R. Opperman received a grant or award of 46 shares of common stock on September 1, 2026, at a reported value of $38.55 per share.

Rhea-AI Filing Summary

ISABELLA BANK CORP (ISBA) reported that director Sarah R. Opperman received a grant or award of 46 shares of common stock on September 1, 2026, at a reported value of $38.55 per share. Following this acquisition, she directly holds 24,586.913 shares of ISBA common stock. No transactions are reported under a Rule 10b5-1 trading plan.

Insider Trade Summary

Grant/Award: 46 shares

Grant/Award 1 txn

Insider Opperman Sarah R

Role Director

Type	Security	Shares	Price	Value
Grant/Award	common	46	$38.55	$2K

Holdings After Transaction: common — 24,586.913 shares (Direct)

Key Figures

Shares acquired: 46 shares Reported value per share: $38.55 per share Total direct holdings after transaction: 24,586.913 shares

3 metrics

Shares acquired 46 shares Grant or award of ISABELLA BANK CORP common stock on September 1, 2026

Reported value per share $38.55 per share Value assigned to the 46-share grant on September 1, 2026

Total direct holdings after transaction 24,586.913 shares Director Sarah R. Opperman’s direct ISBA common stock holdings following the grant

Key Terms

Grant, award, or other acquisition, common, Rule 10b5-1

3 terms

Grant, award, or other acquisition financial

"The filing describes the transaction as a grant, award, or other acquisition"

common financial

"The reported security title is common, referring to common stock"

Rule 10b5-1 regulatory

"The form-level Rule 10b5-1 checkbox is not marked for this transaction"

Rule 10b5-1 is a regulation that allows company insiders to buy or sell their shares at predetermined times, even if they have access to non-public information. It acts like setting a schedule in advance for transactions, helping prevent accusations of unfair trading. This rule provides a way for insiders to plan trades transparently, giving investors confidence that these transactions are not based on hidden information.

FAQ

What insider transaction did ISBA report for director Sarah R. Opperman?

ISABELLA BANK CORP reported that director Sarah R. Opperman acquired 46 shares of common stock as a grant or award on September 1, 2026, at a reported value of $38.55 per share, increasing her direct holdings to 24,586.913 shares.

How many ISBA shares does Sarah R. Opperman hold after the reported transaction?

After the September 1, 2026 grant, Sarah R. Opperman directly holds 24,586.913 shares of ISABELLA BANK CORP common stock, as reported in the Form 4 filing.

What was the price associated with the ISBA share grant to Sarah R. Opperman?

The 46-share grant to Sarah R. Opperman was reported at $38.55 per share. The filing characterizes the transaction as a grant, award, or other acquisition of common stock.

Was the ISBA insider transaction for Sarah R. Opperman under a Rule 10b5-1 plan?

No. The Form 4 indicates that the Rule 10b5-1 checkbox is not marked, so the reported acquisition by Sarah R. Opperman was not affirmed as made under a Rule 10b5-1 trading plan.

What type of security did Sarah R. Opperman acquire from ISBA?

Sarah R. Opperman acquired common stock of ISABELLA BANK CORP in the form of a grant, award, or other acquisition totaling 46 shares, classified as a non-derivative transaction.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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Available on EDGAR 09/03/2026 - 01:06 PM Accepted by SEC EDGAR 09/03/2026 - 01:04 PM Learn about SEC filing dates

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
Estimated average burden
hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

Opperman Sarah R

(Last) (First) (Middle)

401 N MAIN ST

(Street)

MOUNT PLEASANT MICHIGAN 48858

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
ISABELLA BANK CORP [ ISBA ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

X	Director		10% Owner
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/01/2026

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

4. If Amendment, Date of Original Filed (Month/Day/Year)

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
common	09/01/2026		A		46	A	$38.55	24,586.913	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

	/s/ Jennifer L. Gill, By Power of Attorney	09/03/2026
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.
* Form 4: SEC 1474 (03-26)