First Interstate director granted 4,353 RSUs

Bowman Biff reported acquisition or exercise transactions in this Form 4 filing.

Rhea-AI Filing Summary

Bowman Biff reported acquisition or exercise transactions in this Form 4 filing.

First Interstate BancSystem director Biff Bowman received a grant of 4,353 restricted stock units tied to the company’s common stock. The award was issued at no cash cost and will vest on June 1, 2027, if he continues to serve through that date or the next annual shareholder meeting. Following this award, his reported direct holdings total 24,035 common shares on a post-transaction basis.

Insider Trade Summary

Grant/Award: 4,353 shares

Grant/Award 1 txn

Insider Bowman Biff

Role Director

Type	Security	Shares	Price	Value
Grant/Award	Common Stock	4,353	$0.00	$0.00

Holdings After Transaction: Common Stock — 24,035 shares (Direct)

Footnotes (1)

1. F1. Shares issuable upon vesting of restricted stock units granted to the reporting person pursuant to the Registrant's 2023 Equity and Incentive Plan. The restricted stock units vest on June 1, 2027, subject to the reporting person's provision of continuous service to the Registrant through the earlier of the applicable vesting date or the date of the Registrant's next annual shareholder meeting.

Key Figures

Restricted stock units granted: 4,353 units Price per unit: $0.00 per share Shares following transaction: 24,035 shares +1 more

4 metrics

Restricted stock units granted 4,353 units Grant of RSUs tied to common stock

Price per unit $0.00 per share Equity compensation, no cash paid by director

Shares following transaction 24,035 shares Director’s direct holdings after the award

Vesting date June 1, 2027 RSUs vest subject to continuous service conditions

Key Terms

restricted stock units, 2023 Equity and Incentive Plan, vest, continuous service, +1 more

5 terms

restricted stock units financial

"Shares issuable upon vesting of restricted stock units granted to the reporting person"

Restricted stock units are a type of company reward where employees are promised shares of stock, but they only fully own these shares after meeting certain conditions, like staying with the company for a set time. They matter because they can become valuable assets and are often used to motivate employees to help the company succeed.

2023 Equity and Incentive Plan financial

"granted to the reporting person pursuant to the Registrant's 2023 Equity and Incentive Plan"

vest financial

"The restricted stock units vest on June 1, 2027, subject to the reporting person's provision of continuous service"

A vest is the process by which an employee earns the right to receive certain benefits or ownership interests, such as stock or retirement funds, over time. It’s similar to earning a reward gradually, ensuring that the benefit becomes fully yours only after a set period or meeting specific conditions. This makes it important for investors because it determines when they can actually claim or use those benefits.

continuous service financial

"subject to the reporting person's provision of continuous service to the Registrant"

annual shareholder meeting financial

"through the earlier of the applicable vesting date or the date of the Registrant's next annual shareholder meeting"

A yearly gathering where a company’s owners (shareholders) and its leaders meet to review performance, approve key decisions like electing directors, and vote on issues such as executive pay or major policy changes. Think of it as an annual town hall for people who own part of the business: investors use it to ask questions, influence direction through votes, and gauge management’s plans and transparency, all of which can affect the stock’s outlook.

FAQ

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

What insider transaction did FIBK director Biff Bowman report?

Biff Bowman reported receiving 4,353 restricted stock units linked to First Interstate BancSystem common stock. The grant was recorded as a compensation award with no cash price per share in this Form 4 filing.

When do Biff Bowman’s 4,353 FIBK restricted stock units vest?

The 4,353 restricted stock units are scheduled to vest on June 1, 2027. Vesting requires Bowman’s continuous service to First Interstate BancSystem through that date or until the company’s next annual shareholder meeting, whichever occurs first.

How many FIBK shares does Biff Bowman hold after this grant?

After this award, Bowman’s reported direct holdings total 24,035 shares of First Interstate BancSystem common stock. This figure reflects his position immediately following the reported grant of 4,353 restricted stock units in the Form 4.

What plan governs Biff Bowman’s new FIBK restricted stock units?

The restricted stock units were granted under First Interstate BancSystem’s 2023 Equity and Incentive Plan. This plan provides equity-based compensation, and these specific units convert into common shares when vesting conditions are satisfied.

Does Biff Bowman pay cash for the 4,353 FIBK restricted stock units?

No, Bowman did not pay cash for these restricted stock units; the Form 4 shows a price per share of $0.00. The units represent equity compensation that can settle in common stock once vesting conditions are met.

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

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Accepted by SEC EDGAR 06/03/2026 - 01:49 PM EDT Learn about SEC filing dates

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^*

Bowman Biff

(Last) (First) (Middle)

P.O. 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
	Officer (give title below)		Other (specify below)

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
06/01/2026

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	06/01/2026		A		4,353(1)	A	$0	24,035	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. Shares issuable upon vesting of restricted stock units granted to the reporting person pursuant to the Registrant's 2023 Equity and Incentive Plan. The restricted stock units vest on June 1, 2027, subject to the reporting person's provision of continuous service to the Registrant through the earlier of the applicable vesting date or the date of the Registrant's next annual shareholder meeting.

Remarks:

	/s/ Kirk D. Jensen, Attorney-in-Fact for Reporting Person	06/03/2026
	** 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)