FIRST INTERSTATE BANCSYSTEM INC 8-K

What Happened

• First Interstate BancSystem, Inc. (FIBK) filed an 8-K reporting that Kristina Robbins’ employment as Executive Vice President and Chief Operations Officer (COO) was terminated without cause effective May 11, 2026. Concurrently, Robbins transitioned to a new role as Executive Advisor to CEO James Reuter to assist with the COO transition. The company’s CEO will perform the COO duties until a successor is named.
• The company and Robbins executed a Transition and Separation Agreement dated May 11, 2026 (filed as Exhibit 10.1 to the 8-K).

Key Details

• Effective date: May 11, 2026. Advisory role expected to conclude on or before August 1, 2026 unless earlier terminated.
• Robbins will continue to report to CEO James Reuter and will receive her current compensation and benefits during the advisory period.
• Upon completion of the advisory period (absent earlier termination for defined “cause,” “good reason,” death, or disability), her separation as COO will be treated as an involuntary termination under her existing employment agreement (see the company’s Form 10-K filed Feb. 26, 2026 for that agreement’s terms).
• The Transition and Separation Agreement is included as Exhibit 10.1 to the Form 8-K.

Why It Matters

• This is a material executive change affecting operations leadership: the COO role is vacated and the CEO will assume COO responsibilities until a successor is appointed, which may affect operational oversight and management continuity in the near term.
• Robbins’ continued compensation and the involuntary-termination treatment under her employment agreement could have compensation or severance implications; the 8-K points investors to the full agreement for details.
• Investors should review the filed Transition and Separation Agreement (Exhibit 10.1) and the company’s most recent Form 10-K for additional context and the specific terms that could affect financial or governance outcomes.