Isabella Bank director granted 8 ISBA shares

ISABELLA BANK CORP (ISBA) reported that director Brian B. Tessin received a grant or award of 8 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 Brian B. Tessin received a grant or award of 8 shares of common stock on September 1, 2026, at a reported value of $38.55 per share. Following this acquisition, he directly holds 1,070 common shares.

No Rule 10b5-1 trading plan is reported for this transaction.

Insider Trade Summary

Grant/Award: 8 shares

Grant/Award 1 txn

Insider Tessin Brian B

Role Director

Type	Security	Shares	Price	Value
Grant/Award	common	8	$38.55	$308.40

Holdings After Transaction: common — 1,070 shares (Direct)

Key Figures

Shares acquired: 8 shares Reported value per share: $38.55 per share Holdings after transaction: 1,070 shares

3 metrics

Shares acquired 8 shares Grant or award of common stock on September 1, 2026

Reported value per share $38.55 per share Value assigned to the 8-share grant on September 1, 2026

Holdings after transaction 1,070 shares Total direct common shares held by Brian B. Tessin after the acquisition

Key Terms

Rule 10b5-1, Grant, award, or other acquisition, direct ownership

3 terms

Rule 10b5-1 regulatory

"The Rule 10b5-1 checkbox is not affirmed 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.

Grant, award, or other acquisition financial

"The transaction code indicates a Grant, award, or other acquisition"

direct ownership financial

"The filing reports the common shares as held with direct ownership"

FAQ

What insider transaction did ISBA report for Brian B. Tessin?

ISABELLA BANK CORP reported that director Brian B. Tessin received a grant or award of 8 common shares on September 1, 2026, classified as an acquisition rather than an open-market purchase.

How many ISBA shares did Brian B. Tessin acquire and at what value?

Brian B. Tessin acquired 8 common shares of ISABELLA BANK CORP at a reported value of $38.55 per share on September 1, 2026, according to the Form 4 data.

What are Brian B. Tessin’s ISBA holdings after this transaction?

After the September 1, 2026 acquisition, Brian B. Tessin directly holds 1,070 common shares of ISABELLA BANK CORP, as reported in the Form 4 filing.

Was the September 1, 2026 ISBA insider transaction under a Rule 10b5-1 plan?

No. The Form 4 for ISABELLA BANK CORP indicates the Rule 10b5-1 checkbox is not affirmed, so this reported acquisition was not made pursuant to a Rule 10b5-1 trading plan based on the filing data.

What role does Brian B. Tessin have at ISABELLA BANK CORP (ISBA)?

Brian B. Tessin is reported as a director of ISABELLA BANK CORP. The September 1, 2026 Form 4 filing reports his acquisition of additional common shares in this capacity.

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Available on EDGAR 09/03/2026 - 01:00 PM Accepted by SEC EDGAR 09/03/2026 - 12:59 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^*

Tessin Brian B

(Last) (First) (Middle)

401 N MAIN ST.

(Street)

MT 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		8	A	$38.55	1,070	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)