Isabella Bank director buys 7.6142 shares at $39.40

A director of ISBA made a small open-market purchase of common shares, modestly increasing her direct holdings.

Available on EDGAR 09/17/2026 - 10:39 AM EDT Accepted by SEC EDGAR 09/17/2026 - 10:39 AM EDT Learn about SEC filing dates

Rhea-AI Filing Summary

ISABELLA BANK CORP (ISBA) director Jill Bourland purchased additional common shares in an open-market or private transaction on September 16, 2026. She acquired 7.6142 shares at $39.40 per share, bringing her directly held position to 5,916.9085 common shares. No Rule 10b5-1 trading plan is reported for this transaction.

Insider Trade Summary

Net Buyer: 7.6142 shares

Net Buy 1 txn

Insider Bourland Jill

Role Director

Bought 7.6142 shs ($300.00)

Type	Security	Shares	Price	Value
Purchase	common	7.6142	$39.40	$300.00

Holdings After Transaction: common — 5,916.9085 shares (Direct)

Key Figures

Shares purchased: 7.6142 shares Purchase price per share: $39.40 per share Total direct holdings after transaction: 5,916.9085 shares

3 metrics

Shares purchased 7.6142 shares Common shares acquired by director on September 16, 2026

Purchase price per share $39.40 per share Price paid for common shares on September 16, 2026

Total direct holdings after transaction 5,916.9085 shares Director’s directly held ISBA common shares after the reported purchase

Key Terms

Rule 10b5-1, open-market or private transaction

2 terms

Rule 10b5-1 regulatory

"No Rule 10b5-1 trading plan is reported 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.

open-market or private transaction financial

"Purchase in open market or private transaction"

FAQ

AI-generated questions and answers. How Rhea-AI works. Not financial advice.

What insider transaction did ISBA report for director Jill Bourland?

ISABELLA BANK CORP reported that director Jill Bourland purchased 7.6142 common shares on September 16, 2026 in an open-market or private transaction at $39.40 per share, increasing her directly held position.

How many ISBA shares did the director buy and at what price?

Director Jill Bourland bought 7.6142 ISBA common shares at a price of $39.40 per share in the reported transaction on September 16, 2026.

What are Jill Bourland’s total ISBA holdings after this transaction?

After the September 16, 2026 purchase, Jill Bourland directly holds 5,916.9085 ISBA common shares according to the filing.

Was the ISBA insider trade made under a Rule 10b5-1 plan?

No. The filing’s Rule 10b5-1 checkbox is not marked, so no Rule 10b5-1 trading plan is reported for this September 16, 2026 purchase.

Is this ISBA Form 4 transaction a buy or a sell?

The Form 4 reports a purchase of ISBA common stock. Director Jill Bourland acquired 7.6142 shares, and there are no reported sales in this filing.

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

Form 4 Insider Transactions: What Each Field Means →

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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^*

Bourland Jill

(Last) (First) (Middle)

619 S. MISSION 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)
09/16/2026

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	09/16/2026		P		7.6142	A	$39.4	5,916.9085	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	09/17/2026
	** 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)