First Interstate officer surrenders 222 shares for tax

Q: Was the FIBK insider transaction an open-market sale?

No. The Form 4 states the 222-share disposition was to the issuer in payment of minimum required withholding taxes due upon vesting of unvested shares, rather than an open-market sale.

FIBK’s Chief Banking Officer had shares withheld to cover taxes on vesting, remaining directly holding 13,018 shares.

Available on EDGAR 09/22/2026 - 06:21 PM EDT Accepted by SEC EDGAR 09/22/2026 - 06:21 PM EDT

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Filing Sentiment

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Form Type

Rhea-AI Filing Summary

FIRST INTERSTATE BANCSYSTEM INC (FIBK) reported that Chief Banking Officer Christopher L. Shepler had 222 shares of common stock disposed on September 10, 2026 to cover minimum required withholding taxes upon vesting of previously unvested shares, at a reference price of $36.88 per share. After this tax-withholding disposition, he holds 13,018 shares of common stock directly. No Rule 10b5-1 trading plan is reported.

Insider Trade Summary

Tax Withholding: 222 shares

Tax Withholding 1 txn

Insider Shepler Christopher L.

Role Chief Banking Officer

Type	Security	Shares	Price	Value
Tax Withholding	Common Stock ^F1	222	$36.88	$8K

Holdings After Transaction: Common Stock — 13,018 shares (Direct)

Footnotes (1)

F1. Disposition to the issuer of issuer securities in payment of minimum required withholding taxes due upon vesting of unvested shares.

Key Figures

Shares disposed for tax withholding: 222 shares Price per share: $36.88 per share Shares held after transaction: 13,018 shares

3 metrics

Shares disposed for tax withholding 222 shares Disposition to issuer on September 10, 2026 for minimum required withholding taxes

Price per share $36.88 per share Reference price for the 222 shares disposed for tax withholding

Shares held after transaction 13,018 shares Direct holdings of Christopher L. Shepler after the September 10, 2026 transaction

Key Terms

withholding taxes, vesting, disposition to the issuer

3 terms

withholding taxes financial

"in payment of minimum required withholding taxes due upon vesting"

Withholding taxes are amounts a payer or government takes out of payments — such as wages, interest, or dividends — before the recipient gets the money, functioning like a cashier keeping part of a bill to pay taxes on your behalf. For investors this matters because it reduces the cash they actually receive, affects net returns and yield calculations, and may require additional paperwork or treaty claims to recover or offset the withheld amount against final tax bills.

vesting financial

"taxes due upon vesting of unvested shares"

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.

disposition to the issuer financial

"Disposition to the issuer of issuer securities in payment"

FAQ

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

What insider transaction did FIBK report for Christopher L. Shepler?

FIBK reported that Chief Banking Officer Christopher L. Shepler had 222 shares of common stock disposed on September 10, 2026 to pay minimum required withholding taxes upon vesting of unvested shares, leaving him with 13,018 shares held directly.

Was the FIBK insider transaction an open-market sale?

No. The Form 4 states the 222-share disposition was to the issuer in payment of minimum required withholding taxes due upon vesting of unvested shares, rather than an open-market sale.

How many FIBK shares does Christopher L. Shepler hold after this transaction?

After the reported tax-withholding disposition, Christopher L. Shepler directly holds 13,018 shares of FIRST INTERSTATE BANCSYSTEM INC common stock.

At what price were the 222 FIBK shares valued for the tax withholding?

The 222 FIRST INTERSTATE BANCSYSTEM INC shares used for tax withholding were reported at $36.88 per share in the Form 4.

Was a Rule 10b5-1 trading plan involved in this FIBK Form 4?

No. The filing’s Rule 10b5-1 checkbox is not marked, and there is no footnote stating that the 222-share disposition was made under a Rule 10b5-1 trading plan.

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

Form 4 Insider Transactions: What Each Field Means →

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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^*

Shepler Christopher L.

(Last)

(First)

(Middle)

401 N. 31ST ST.

(Street)

BILLINGS

MONTANA

59101

(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 Banking Officer

2a. Foreign Trading Symbol

3. Date of Earliest Transaction (Month/Day/Year)
09/10/2026

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)
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	Code	V	Amount	(A) or (D)	Price		6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
Common Stock	09/10/2026		F		222	D	$36.88⁽¹⁾	13,018	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)
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)	Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares	8. Price of Derivative Security (Instr. 5)		10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)

Explanation of Responses:

1. Disposition to the issuer of issuer securities in payment of minimum required withholding taxes due upon vesting of unvested shares.

Remarks:

	/s/ Brian M. Murphy, Attorney-in-fact for Reporting Person	09/22/2026
	** 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)

Source: View Original Filing on SEC EDGAR