First Interstate COO granted 5,417 RSUs

FIBK’s Chief Operations Officer received 5,417 RSUs that vest over three years starting in 2027, tied to continued employment.

Rhea-AI Filing Summary

FIRST INTERSTATE BANCSYSTEM INC (symbol: FIBK) is the issuer of record for a Form 4 filing submitted to the SEC. Lee Jeffery D. reported acquisition or exercise transactions in this Form 4 filing.

FIRST INTERSTATE BANCSYSTEM INC (FIBK) granted Chief Operations Officer Jeffery D. Lee 5,417 restricted stock units of common stock on September 14, 2026 under its 2023 Equity and Incentive Plan. These RSUs vest in three equal annual installments starting September 14, 2027, conditioned on his continued employment through each vesting date.

Insider Trade Summary

Grant/Award: 5,417 shares

Grant/Award 1 txn

Insider Lee Jeffery D.

Role Chief Operations Officer

Type	Security	Shares	Price	Value
Grant/Award	Common Stock F1	5,417	$0.00	$0.00

Holdings After Transaction: Common Stock — 5,417 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 in three equal annual installments beginning on September 14, 2027, subject to the reporting person's continued employment through each applicable vesting date.

Key Figures

RSUs granted: 5,417 shares Price per RSU: $0.00 per share Vesting schedule: 3 equal annual installments +2 more

5 metrics

RSUs granted 5,417 shares Restricted stock units of common stock granted on September 14, 2026

Price per RSU $0.00 per share Compensation grant, not a market purchase

Vesting schedule 3 equal annual installments RSUs vest annually beginning September 14, 2027

First vesting date September 14, 2027 Initial installment of RSUs vests on this date

Shares held after grant 5,417 shares Total reported direct holdings following the transaction

Key Terms

restricted stock units, 2023 Equity and Incentive Plan, vesting, continued employment

4 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"

vesting financial

"The restricted stock units vest in three equal annual installments"

Vesting is the process by which you earn full ownership of something, like company stock or a retirement benefit, over time. It’s like earning the right to keep a gift piece by piece the longer you stay with a company, making sure employees stay committed before they receive all the benefits.

continued employment financial

"subject to the reporting person's continued employment through each applicable vesting date"

Continued employment means that an individual remains in their current job without interruption. For investors, it signals stability and ongoing work that can affect company performance and future prospects. Like a steady heartbeat for a business, sustained employment helps ensure consistent operations and financial health.

FAQ

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

What insider transaction did FIBK report for Jeffery D. Lee?

FIBK reported that Chief Operations Officer Jeffery D. Lee received a grant of 5,417 restricted stock units of common stock on September 14, 2026 as a compensation award under the company’s 2023 Equity and Incentive Plan.

How do the 5,417 RSUs granted to FIBK’s COO vest?

The 5,417 RSUs vest in three equal annual installments beginning on September 14, 2027. Each installment is subject to Jeffery D. Lee’s continued employment through the applicable vesting date.

What is the exercise or purchase price of the FIBK RSU grant?

The Form 4 lists a price of $0.00 per share for the 5,417 RSUs, reflecting that they are a compensation grant rather than a purchase in the market.

How many FIBK shares does Jeffery D. Lee hold after this RSU grant?

After the reported transaction, Jeffery D. Lee is shown as holding 5,417 shares related to this RSU award, reported as direct ownership on the Form 4.

Are the FIBK RSUs for the COO subject to continued employment?

Yes. The filing states the restricted stock units vest in three equal annual installments starting September 14, 2027, subject to the reporting person’s continued employment through each applicable vesting date.

Were the FIBK COO’s RSUs granted under a specific equity plan?

Yes. The restricted stock units were granted pursuant to FIRST INTERSTATE BANCSYSTEM INC’s 2023 Equity and Incentive Plan, as disclosed in the Form 4 footnote.

Was the FIBK COO’s RSU grant made under a Rule 10b5-1 trading plan?

No. The filing’s Rule 10b5-1 checkbox is reported as unchecked, and there is no footnote indicating that the RSU grant was made under a Rule 10b5-1 trading plan.

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

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Available on EDGAR 09/16/2026 - 01:16 PM Accepted by SEC EDGAR 09/16/2026 - 01:16 PM 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^*

Lee Jeffery D.

(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)

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

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/14/2026

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	09/14/2026		A		5,417	A	$0(1)	5,417	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 in three equal annual installments beginning on September 14, 2027, subject to the reporting person's continued employment through each applicable vesting date.

Remarks:

	/s/ Brian M. Murphy, Attorney-in-fact for Reporting Person	09/16/2026
	** 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)