State Street Corporation (NYSE: STT) discloses 6.4% beneficial stake in First Interstate

Rhea-AI Filing Summary

State Street Corporation filed a Schedule 13G reporting beneficial ownership of common stock of First Interstate Inc (FIBK). State Street reports beneficial ownership of 6,250,817 shares of common stock, representing 6.4% of the class identified by CUSIP 32055Y201.

State Street reports no sole voting or dispositive power over these shares. It reports shared voting power over 696,148 shares and shared dispositive power over all 6,250,817 shares. The holdings are associated with asset management subsidiaries including SSGA Funds Management, Inc. and several State Street Global Advisors entities. No other person is identified as having the right to receive dividends or sale proceeds for more than 5% of the class, and no group arrangements are reported.

Key Figures

Shares beneficially owned: 6,250,817 shares Percent of class owned: 6.4% Shared voting power: 696,148 shares +3 more

6 metrics

Shares beneficially owned 6,250,817 shares Common stock of First Interstate Inc reported by State Street Corporation

Percent of class owned 6.4% Beneficial ownership percentage of First Interstate Inc common stock

Shared voting power 696,148 shares Shares over which State Street has shared power to vote or direct the vote

Shared dispositive power 6,250,817 shares Shares over which State Street has shared power to dispose or direct the disposition

CUSIP 32055Y201 CUSIP for First Interstate Inc common stock reported in the Schedule 13G

Signature date 08/07/2026 Date of signing by Senior Vice President, Chief Accounting Officer

Key Terms

beneficially owned, shared voting power, dispositive power, parent holding company, +1 more

5 terms

beneficially owned financial

"Item 4. | Ownership (a) | Amount beneficially owned: 6250817.00"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

shared voting power financial

"(ii) Shared power to vote or to direct the vote: 696,148"

Shared voting power occurs when two or more parties jointly have the right to vote or decide how a block of company shares is cast, like co-owners who must agree before moving a piece of furniture. Investors care because who controls voting rights affects board elections, major corporate decisions and takeover outcomes, and shared control can alter regulatory disclosures and the practical influence any holder has over a company’s direction and value.

dispositive power financial

"(iii) Sole power to dispose or to direct the disposition of: 0 | (iv) Shared power to dispose"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

parent holding company financial

"If a parent holding company has filed this schedule, pursuant to (ii)(G), so indicate"

investment company financial

"shareholders of an investment company registered under the Investment Company Act of 1940"

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FAQ

What percentage of First Interstate Inc (FIBK) does State Street Corporation report owning?

State Street Corporation reports beneficial ownership of 6.4% of First Interstate Inc’s common stock. This is based on 6,250,817 shares of common stock reported as beneficially owned on the Schedule 13G.

How many First Interstate Inc (FIBK) shares does State Street Corporation beneficially own?

State Street Corporation reports beneficial ownership of 6,250,817 shares of First Interstate Inc common stock. These shares correspond to 6.4% of the outstanding class identified by CUSIP 32055Y201.

What voting power does State Street have over its FIBK shares?

State Street reports shared voting power over 696,148 FIBK shares and no sole voting power. It also reports shared dispositive power over 6,250,817 shares, with no sole dispositive power over any shares.

Which State Street subsidiaries are involved in managing the FIBK position?

The filing lists SSGA Funds Management, Inc. and several State Street Global Advisors entities, including entities in Europe, the U.K., the U.S., and Australia, as relevant investment adviser subsidiaries involved with the FIBK holdings.

Does any other party hold more than 5% of FIBK through State Street’s accounts?

The Schedule 13G states “NOT APPLICABLE” for ownership of more than 5 percent on behalf of another person, indicating no other person is identified as receiving dividends or sale proceeds for more than 5% of the FIBK class through these holdings.

Is State Street part of a group for its First Interstate Inc (FIBK) holdings?

The filing indicates “NOT APPLICABLE” for identification of members of a group. This means no group filing arrangement is reported for State Street’s 6.4% beneficial ownership of FIBK common stock.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

FIRST INTERSTATE BANCSYSTEM INC

(Name of Issuer)

COMMON STOCK

(Title of Class of Securities)

32055Y201

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 32055Y201

1

Names of Reporting Persons

STATE STREET CORPORATION

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

MASSACHUSETTS

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 0.00
6	Shared Voting Power 696,148.00
7	Sole Dispositive Power 0.00
8	Shared Dispositive Power 6,250,817.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

6,250,817.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

6.4 %

12

Type of Reporting Person (See Instructions)

HC

SCHEDULE 13G

Item 1.
(a)	Name of issuer: FIRST INTERSTATE BANCSYSTEM INC
(b)	Address of issuer's principal executive offices: PO BOX 30918 401 NORTH 31ST STREET, BILLINGS, MONTANA, 59107
Item 2.
(a)	Name of person filing: STATE STREET CORPORATION;
(b)	Address or principal business office or, if none, residence: ONE CONGRESS STREET, SUITE 1, BOSTON MA 02114, UNITED STATES
(c)	Citizenship: MA
(d)	Title of class of securities: COMMON STOCK
(e)	CUSIP Number(s): 32055Y201
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 6250817.00
(b)	Percent of class: 6.4 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 0
	(ii) Shared power to vote or to direct the vote: 696,148
	(iii) Sole power to dispose or to direct the disposition of: 0
	(iv) Shared power to dispose or to direct the disposition of: 6,250,817
Item 5.	Ownership of 5 Percent or Less of a Class.
	Not Applicable
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. NOT APPLICABLE
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	If a parent holding company has filed this schedule, pursuant to Rule 13d-1(b)(ii)(G), so indicate under Item 3(g) and attach an exhibit stating the identity and the Item 3 classification of the relevant subsidiary. If a parent holding company has filed this schedule pursuant to Rule 13d-1(c) or Rule 13d-1(d), attach an exhibit stating the identification of the relevant subsidiary. SSGA FUNDS MANAGEMENT, INC. (IA);STATE STREET GLOBAL ADVISORS EUROPE LIMITED (IA);STATE STREET GLOBAL ADVISORS LIMITED (IA);STATE STREET GLOBAL ADVISORS TRUST COMPANY (IA);STATE STREET GLOBAL ADVISORS, AUSTRALIA, LIMITED (IA);STATE STREET GLOBAL ADVISORS, LTD. (IA);
Item 8.	Identification and Classification of Members of the Group.
	If a group has filed this schedule pursuant to §240.13d-1(b)(1)(ii)(K), so indicate under Item 3(k) and attach an exhibit stating the identity and Item 3 classification of each member of the group. If a group has filed this schedule pursuant to §240.13d-1(c) or §240.13d-1(d), attach an exhibit stating the identity of each member of the group. NOT APPLICABLE
Item 9.	Notice of Dissolution of Group.
	Notice of dissolution of a group may be furnished as an exhibit stating the date of the dissolution and that all further filings with respect to transactions in the security reported on will be filed, if required, by members of the group, in their individual capacity. See Item 5. NOT APPLICABLE

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

STATE STREET CORPORATION

Signature:	ELIZABETH SCHAEFER
Name/Title:	SENIOR VICE PRESIDENT, CHIEF ACCOUNTING OFFICER
Date:	08/07/2026