ISABELLA BANK (ISBA) Chief Credit Officer buys 103 common shares

Rhea-AI Filing Summary

ISABELLA BANK CORP’s Chief Credit Officer, Jon D. Catlin, reported an open-market purchase of 103 shares of the company’s common stock at a price of $31.47 per share. Following this transaction, his directly owned position increased to 1,285.4153 common shares.

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

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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^*

Catlin Jon D

(Last) (First) (Middle)

139 E. BROADWAY ST.

(Street)

MT. PLEASANT MI 48858

(City) (State) (Zip)

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

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

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

3. Date of Earliest Transaction (Month/Day/Year)
03/02/2026

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

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

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

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	03/02/2026		P		103	A	$31.47	1,285.4153	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	03/04/2026
	** 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.

FAQ

What insider transaction did ISBA’s Jon D. Catlin report?

Jon D. Catlin reported buying 103 shares of ISABELLA BANK CORP common stock in an open-market transaction. This Form 4 filing reflects a routine insider purchase rather than a sale, slightly increasing his direct equity stake in the company.

At what price did Jon D. Catlin buy ISBA shares?

Jon D. Catlin purchased the ISBA common shares at $31.47 per share. This price reflects the cost of his open-market transaction and provides a concrete reference level for this specific insider buy reported in the Form 4 filing.

How many ISBA shares does Jon D. Catlin own after the transaction?

After the purchase, Jon D. Catlin directly owns 1,285.4153 ISBA common shares. The Form 4 indicates this as his total direct beneficial ownership following the 103-share open-market acquisition recorded on the reported transaction date.

What role does Jon D. Catlin hold at ISABELLA BANK CORP?

Jon D. Catlin serves as Chief Credit Officer at ISABELLA BANK CORP. His Form 4 filing discloses an open-market purchase of company stock, linking this transaction to a senior executive responsible for overseeing the institution’s credit risk and lending quality.

Was the reported ISBA insider transaction a purchase or sale?

The ISBA insider transaction was a purchase, not a sale. The Form 4 identifies it as an open-market purchase of 103 common shares, increasing the Chief Credit Officer’s direct holdings rather than reducing his ownership position in the company.