Isabella Bank (ISBA) director adds shares in small open-market buy

Rhea-AI Filing Summary

Isabella Bank Corp director Jill Bourland bought a small number of Isabella Bank common shares in an open-market transaction. She purchased 7.3082 shares at a price of $41.05 per share. Following this trade, her direct ownership increased to a total of 5,860.6074 common shares.

Insider Trade Summary

Net Buyer: 7.308 shares ($300)

Net Buy 1 txn

Insider Bourland Jill

Role null

Bought 7.308 shs ($300.00)

Type	Security	Shares	Price	Value
Purchase	common	7.308	$41.05	$300.00

Holdings After Transaction: common — 5,860.607 shares (Direct, null)

Footnotes (1)

Key Figures

Shares purchased: 7.3082 shares Purchase price: $41.05 per share Shares owned after transaction: 5,860.6074 shares

3 metrics

Shares purchased 7.3082 shares Open-market purchase on 2026-05-18

Purchase price $41.05 per share Open-market purchase of common stock

Shares owned after transaction 5,860.6074 shares Direct holdings following the Form 4 transaction

Key Terms

open-market purchase, non-derivative, transaction code P, direct ownership

4 terms

open-market purchase financial

"transaction_action: "open-market purchase""

An open-market purchase is when an investor or a company buys shares on a public stock exchange at the going market price, rather than through a private deal. It matters to investors because these purchases change how many shares are available, can push the stock price up or signal confidence from large buyers, and often affect per-share metrics like earnings—think of it like someone buying lots of apples off a grocery shelf, reducing supply and potentially raising the price.

non-derivative financial

"transaction_type: "non-derivative" for the common stock trade"

transaction code P financial

"transaction_code: "P" indicating a purchase in open market"

direct ownership financial

"direct_or_indirect: "D" and ownership_type: "direct""

Form 4 Insider Transactions: What Each Field Means →

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)
05/18/2026

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	05/18/2026		P		7.3082	A	$41.05	5,860.6074	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	05/20/2026
	** 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)

FAQ

What insider transaction did Isabella Bank (ISBA) report for Jill Bourland?

Isabella Bank reported that director Jill Bourland completed an open-market purchase of common stock. She bought 7.3082 shares at $41.05 per share, modestly increasing her direct ownership position in Isabella Bank Corp common shares.

How many Isabella Bank (ISBA) shares does Jill Bourland hold after this Form 4?

After the reported transaction, Jill Bourland directly owns 5,860.6074 Isabella Bank common shares. This total reflects her previous holdings plus the 7.3082 shares acquired in the latest open-market purchase at $41.05 per share.

Was the Isabella Bank (ISBA) insider trade a purchase or a sale?

The insider trade was a purchase. Director Jill Bourland executed an open-market buy of 7.3082 Isabella Bank common shares, coded as transaction type P, indicating an open-market or private purchase under SEC Form 4 rules.

What price did Jill Bourland pay for Isabella Bank (ISBA) shares?

Jill Bourland paid $41.05 per share for Isabella Bank common stock. The Form 4 shows she acquired 7.3082 shares at this price in an open-market purchase, slightly increasing her directly held position in the company.

Is Jill Bourland’s Isabella Bank (ISBA) ownership direct or indirect?

Her reported ownership is direct. The Form 4 lists the ownership code as D for direct, with nature of ownership not further qualified, and shows 5,860.6074 common shares held directly after the open-market purchase.