FIRST INTERSTATE BANCSYSTEM (FIBK) CEO has 5,125 shares withheld for tax on RSU vesting

Rhea-AI Filing Summary

FIRST INTERSTATE BANCSYSTEM INC President and CEO James A. Reuter reported a routine share disposition related to tax withholding. On March 16, 2026, 5,125 shares of common stock were withheld at $33.22 per share to satisfy tax obligations upon vesting of a previously reported restricted stock unit award. After this transaction, Reuter directly holds 86,904 shares of common stock.

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^*

Reuter James A

(Last) (First) (Middle)

PO BOX 30918

(Street)

BILLINGS MONTANA 59116-0918

(City) (State) (Zip)

UNITED STATES

(Country)

2. Issuer Name and Ticker or Trading Symbol
FIRST INTERSTATE BANCSYSTEM INC [ FIBK ]

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

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
03/16/2026

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 Stock	03/16/2026		F		5,125(1)	D	$33.22	86,904	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:

1. Number of shares of common stock withheld to satisfy the reporting person's tax withholding obligations upon vesting of a previously reported restricted stock unit award.

Remarks:

	/s/ Kirk D. Jensen, as attorney in fact for reporting person	03/18/2026
	** 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 FIBK President and CEO James Reuter report?

James Reuter reported a tax-related share disposition. On March 16, 2026, 5,125 shares of FIRST INTERSTATE BANCSYSTEM INC common stock were withheld to cover tax obligations from a vesting restricted stock unit award.

Was James Reuter’s FIBK transaction an open-market stock sale?

No, the filing describes a tax-withholding disposition, not an open-market sale. Shares were withheld by the company to satisfy Reuter’s tax obligations when a previously reported restricted stock unit award vested.

How many FIRST INTERSTATE BANCSYSTEM (FIBK) shares were involved in the tax withholding?

The transaction involved 5,125 shares of FIRST INTERSTATE BANCSYSTEM INC common stock. These shares were withheld at a price of $33.22 per share to satisfy James Reuter’s tax liabilities tied to a vesting restricted stock unit award.

How many FIBK shares does James Reuter hold after this Form 4 transaction?

After the tax-withholding disposition, James Reuter directly holds 86,904 shares of FIRST INTERSTATE BANCSYSTEM INC common stock. This reflects his remaining direct ownership following the withholding of 5,125 shares for tax obligations.

What does transaction code F mean in the FIBK Form 4 filing?

Transaction code F indicates a payment of tax liability or exercise price by delivering securities. In this case, 5,125 FIBK shares were withheld to cover James Reuter’s tax obligations when a restricted stock unit award vested.