$FIBK

Scott Jonathan R sold 5,000 indirectly-held shares of FIRST INTERSTATE BANCSYSTEM INC (FIBK) at an average of $37.26 ($37.00–$37.31, $0.19M total) across 2 trades over 2026-10-23 to 2026-10-26. Filed jointly with Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04 (10% owner), Harrison William Scott Trust (10% owner), Harper Grace Scott Trust (10% owner), Holland Elizabeth Scott Trust (10% owner) and IXL Ltd Liability Co (10% owner).

Scott Jonathan R sold 5,000 indirectly-held shares of FIRST INTERSTATE BANCSYSTEM INC (FIBK) at $36.90 ($0.18M total) on 2026-10-22. Filed jointly with Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04 (10% owner), Harrison William Scott Trust (10% owner), Harper Grace Scott Trust (10% owner), Holland Elizabeth Scott Trust (10% owner) and IXL Ltd Liability Co (10% owner).

First Interstate BancSystem (FIBK) reported Q3 net income of $62.2M, down from $83.9M in Q2 due to a prior gain. Net interest income rose 2% to $206.2M, with a 3.55% net interest margin. Credit metrics improved, and the company repurchased 2M shares for $76M, maintained a $0.47 dividend, and plans branch expansions and consolidations.

FIRST INTERSTATE BANCSYSTEM INC (FIBK) filed an SEC Form 8-K — Results of Operations and Financial Condition. Exhibit 99.1 For Immediate Release First Interstate BancSystem, Inc. Reports Third Quarter Earnings Billings, MT - October 22, 2026 - First Interstate BancSystem, Inc. (NASDAQ: FIBK) (the “Company”) today reported financial results for the third quarter of 2026. For the quarter,

SCOTT JULIE A sold 2,700 indirectly-held shares of FIRST INTERSTATE BANCSYSTEM INC (FIBK) at $37.64 ($0.10M total) on 2026-09-16. Filed jointly with Julie A Scott Rose Trustee of the Julie A Scott Rose Trust Dated 5-14-2002 (10% owner), IXL Ltd Liability Co (10% owner), Juliana Sarah Scott Rose Trust (10% owner) and Elizabeth Lauren Scott Rose Trust (10% owner).

FIRST INTERSTATE BANCSYSTEM INC (FIBK) filed an SEC Form 8-K — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers. Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. On September 14, 2026, First Interstate BancSystem, Inc. (the “Company”), its wholly owned subsidiary First Interstate Bank

Scott Jonathan R sold 8,071 indirectly-held shares of FIRST INTERSTATE BANCSYSTEM INC (FIBK) at $37.29 ($0.30M total) on 2026-09-14. Filed jointly with Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04 (10% owner), Harrison William Scott Trust (10% owner), Harper Grace Scott Trust (10% owner), Holland Elizabeth Scott Trust (10% owner) and IXL Ltd Liability Co (10% owner).

Scott Jonathan R sold 16,929 indirectly-held shares of FIRST INTERSTATE BANCSYSTEM INC (FIBK) at $37.03 ($0.63M total) on 2026-09-11. Filed jointly with Jonathan Scott as Trustee of the Jonathan R Scott Trust Dated as of 4/21/04 (10% owner), Harrison William Scott Trust (10% owner), Harper Grace Scott Trust (10% owner), Holland Elizabeth Scott Trust (10% owner) and IXL Ltd Liability Co (10% owner).

FIRST INTERSTATE BANCSYSTEM INC (FIBK) filed an SEC Form 8-K — Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers: Compensatory Arrangements of Certain Officers. Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers. Appointment of Chief Operations Officer On August 21, 2026, the registrant announced the appointment of Mr. Jeff Lee to bec

Simply Wall St says First Interstate BancSystem (FIBK) repurchased 2,152,356 shares for $78.04 million from Apr 1 to Jul 30, 2026, retiring 8,199,163 shares total for $279.60 million and reducing share count by just over 8%. It also cites Q2 2026 net income of $83.9 million and $9.7 million charge-offs, plus analyst revenue and earnings forecasts to 2029.