[Form 3] FIRST INTERSTATE BANCSYSTEM INC Initial Statement of Beneficial Ownership

Rhea-AI Filing Summary

Christopher L. Shepler filed an initial Form 3 reporting no beneficial ownership of First Interstate BancSystem, Inc. (FIBK) common stock as of the 09/10/2025 event date. The form lists Shepler as an officer (Chief Banking Officer) and director. The filing states zero shares owned directly or indirectly and explains the submission delay was related to the EDGAR Next enrollment process. The form is signed by an attorney-in-fact on 10/09/2025.

Positive

• Initial Form 3 filed identifying the reporting person and roles (Chief Banking Officer and director).
• Clear explanation provided for the filing delay attributed to the EDGAR Next enrollment process.
• No securities beneficially owned reported, avoiding immediate disclosure of insider trades or holdings.

Negative

• Filing was delayed (signed on 10/09/2025 for a 09/10/2025 event), which may merit attention if related disclosures follow.

Insights

Corporate Governance Expert

TL;DR: An officer/director reported no beneficial ownership and cited an administrative EDGAR delay.

The report shows no common stock held by the reporting person, which means there is no immediate insider share-based alignment disclosed in this filing. This is a straightforward initial ownership statement rather than a transaction report.

The stated cause for delayed filing is an EDGAR Next enrollment issue; this is an administrative explanation rather than an indication of undisclosed holdings. Watch for any subsequent amendments or Forms 4 that would record option grants, purchases, or other holdings within typical Section 16 reporting windows.

SEC Form 3

FORM 3

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

INITIAL STATEMENT OF BENEFICIAL OWNERSHIP OF SECURITIES

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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1. Name and Address of Reporting Person^*

Shepler Christopher L.

(Last) (First) (Middle)

401 N. 31ST ST.

(Street)

BILLINGS MT 59101

(City) (State) (Zip)

2. Date of Event Requiring Statement (Month/Day/Year)
09/10/2025

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

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

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

5. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Beneficially Owned
1. Title of Security (Instr. 4)	2. Amount of Securities Beneficially Owned (Instr. 4)	3. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	4. Nature of Indirect Beneficial Ownership (Instr. 5)
Common Stock	0	D

Table II - Derivative Securities Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 4)	2. Date Exercisable and Expiration Date (Month/Day/Year)		3. Title and Amount of Securities Underlying Derivative Security (Instr. 4)		4. Conversion or Exercise Price of Derivative Security	5. Ownership Form: Direct (D) or Indirect (I) (Instr. 5)	6. Nature of Indirect Beneficial Ownership (Instr. 5)
	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

Remarks:

No securities are beneficially owned. The filing delay was related to the EDGAR Next enrollment process. Exhibit List: Exhibit 24 - Power of Attorney

	/s/ Kirk D. Jensen, Attorney-in-Fact for Reporting Person	10/09/2025
	** 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 5 (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.

FAQ

What did the Form 3 for FIBK report about Christopher L. Shepler's holdings?

The Form 3 states zero shares of common stock beneficially owned by Christopher L. Shepler.

What roles does the reporting person hold at First Interstate BancSystem (FIBK)?

The filing lists the reporting person as a Director and Officer with the title Chief Banking Officer.

When is the event date and when was the Form 3 signed for FIBK?

The event date is 09/10/2025 and the form was signed by an attorney-in-fact on 10/09/2025.

Why was the Form 3 filing delayed?

The filing explains the delay was related to the EDGAR Next enrollment process.

Should investors expect insider transaction filings after this Form 3 for FIBK?

If the reporting person later acquires or is granted securities, such transactions would be reported on subsequent Forms 4 or amendments.