First Interstate BancSystem (FIBK) EVP has 1,241 shares withheld for taxes

Rhea-AI Filing Summary

First Interstate BancSystem executive Kristina Robbins reported a routine tax-withholding transaction in company stock. On this Form 4, 1,241 shares of common stock were withheld at $33.22 per share to cover her tax obligations when a previously reported restricted stock unit award vested. After this non‑market disposition, she holds 18,887 shares directly.

Insider Trade Summary

1 transaction reported

Mixed 1 txn

Insider Robbins Kristina

Role EVP, Chief Operations Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock	1,241	$33.22	$41K

Holdings After Transaction: Common Stock — 18,887 shares (Direct)

Footnotes (1)

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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^*

Robbins Kristina

(Last) (First) (Middle)

PO BOX 30918

(Street)

BILLINGS MONTANA 59116

(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)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	EVP, Chief Operations Officer

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		1,241(1)	D	$33.22	18,887	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 Kristina Robbins report at FIBK?

Kristina Robbins reported a tax-related share disposition in First Interstate BancSystem stock. The Form 4 shows shares were withheld to satisfy her tax obligations upon vesting of a previously reported restricted stock unit award, rather than through an open-market trade.

How many FIBK shares were withheld for Kristina Robbins' taxes?

A total of 1,241 common shares were withheld for Kristina Robbins’ taxes. These shares were valued at $33.22 per share and were used to cover tax withholding obligations triggered when a restricted stock unit award vested, as detailed in the Form 4 filing.

Is Kristina Robbins' Form 4 transaction an open-market sale of FIBK stock?

No, the reported transaction is not an open-market sale. The Form 4 lists transaction code F, indicating shares were withheld to pay tax liabilities on a vesting restricted stock unit award, a standard administrative disposition rather than a discretionary buy or sell in the market.

How many FIBK shares does Kristina Robbins hold after this transaction?

Kristina Robbins holds 18,887 First Interstate BancSystem shares after the transaction. This total reflects her direct ownership following the withholding of 1,241 shares to satisfy tax obligations tied to the vesting of a previously reported restricted stock unit award.

What does transaction code F mean in Kristina Robbins' Form 4 for FIBK?

Transaction code F indicates a tax-withholding disposition. In this case, 1,241 shares of First Interstate BancSystem common stock were delivered to cover Kristina Robbins’ tax liability when a restricted stock unit award vested, rather than being sold by her in the open market.

What is Kristina Robbins' role at First Interstate BancSystem (FIBK)?

Kristina Robbins serves as Executive Vice President and Chief Operations Officer. Her Form 4 identifies her as an officer of First Interstate BancSystem, and the reported transaction reflects routine tax withholding associated with equity compensation in the form of restricted stock unit awards.