FIRST INTERSTATE BANCSYSTEM INC

Q: Jun 30 2026

Q: Mar 31 2026

FY: Dec 31 2025

Q: Sep 30 2025

Q: Jun 30 2025

Q: Mar 31 2025

FY: Dec 31 2024

Q: Sep 30 2024

Q: Jun 30 2024

Q: Mar 31 2024

FY: Dec 31 2023

Q: Sep 30 2023

Q: Jun 30 2023

Q: Mar 31 2023

FY: Dec 31 2022

Q: Sep 30 2022

Q: Jun 30 2022

Q: Mar 31 2022

FY: Dec 31 2021

Q: Sep 30 2021

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Results of Operations and Financial Condition

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Results of Operations and Financial Condition

Results of Operations and Financial Condition

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Results of Operations and Financial Condition

Regulation FD Disclosure

Regulation FD Disclosure

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Other Events

Termination of a Material Definitive Agreement

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers

Results of Operations and Financial Condition

Automatic Shelf Registration

Prospectus Supplement for Primary Offering

Prospectus Supplement for Primary Offering

Free Writing Prospectus

Free Writing Prospectus

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Automatic Shelf Registration

Registration of Securities on Exchange (amendment)

Registration statement under Securities Act of 1933 to be offered to employees pursuant to certain plans

Post Effective Amendment to S-8

Post Effective Amendment to S-8

Certification of termination of registration of a class of securities (Section 12(g))

Registration of Securities on Exchange (amendment)

Written communication about a business combination transaction (Rule 425)

Written communication about a business combination transaction (Rule 425)

Prospectus Supplement for Primary Offering

Notice of Effectiveness

Registration statement under Securities Act of 1933 (amendment)

Registration statement under Securities Act of 1933

Written communication about a business combination transaction (Rule 425)

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Preliminary Proxy Statement

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Preliminary Proxy Statement

Additional Information for Proxy Statement/ Votes

Definitive Proxy Statement

Definitive Proxy Statement

Additional Information for Proxy Statement/ Votes

Additional Information for Proxy Statement/ Votes

Shepler Christopher L.

Lee Jeffery D.

Julie A Scott Rose Trustee of the Julie A Scott Rose Trust Dated 5-14-2002; SCOTT JULIE A; IXL Ltd Liability Co; Elizabeth Lauren Scott Rose Trust; Juliana Sarah Scott Rose Trust

Lee Jeffery D.

Harper Grace Scott Trust; Scott Jonathan R; Harrison William Scott Trust; IXL Ltd Liability Co; Holland Elizabeth Scott Trust; Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04

Harper Grace Scott Trust; Scott Jonathan R; Harrison William Scott Trust; IXL Ltd Liability Co; Holland Elizabeth Scott Trust; Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04

Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04

STATE STREET CORP

Julie A Scott Rose Trustee of the Julie A Scott Rose Trust Dated 5-14-2002; SCOTT JULIE A; IXL Ltd Liability Co; Elizabeth Lauren Scott Rose Trust; Juliana Sarah Scott Rose Trust

TURNER BRIAN KEVIN

Ritter Matthew John

Ritter Matthew John

TURNER BRIAN KEVIN

Harper Grace Scott Trust; Scott Jonathan R; Harrison William Scott Trust; IXL Ltd Liability Co; Holland Elizabeth Scott Trust; Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04

Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04

Julie A Scott Rose Trustee of the Julie A Scott Rose Trust Dated 5-14-2002

Julie A Scott Rose Trustee of the Julie A Scott Rose Trust Dated 5-14-2002; SCOTT JULIE A; IXL Ltd Liability Co; Elizabeth Lauren Scott Rose Trust; Juliana Sarah Scott Rose Trust

Harper Grace Scott Trust; Scott Jonathan R; Harrison William Scott Trust; IXL Ltd Liability Co; Holland Elizabeth Scott Trust; Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04

Harper Grace Scott Trust; Scott Jonathan R; Harrison William Scott Trust; IXL Ltd Liability Co; Holland Elizabeth Scott Trust; Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04

Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04

Annual Report Scanned (Paper)

No description available

Annual Report Scanned (Paper)

Annual Report Scanned (Paper)

Annual Report Scanned (Paper)

Correspondence with the SEC

Letter from the SEC

No description available

Correspondence with the SEC

Letter from the SEC

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Correspondence with the SEC

Letter from the SEC

Letter from the SEC

Correspondence with the SEC

Letter from the SEC