---
schema_version: "secwatch.filing_event.v1"
accession: "0000860413-26-000048"
form_type: "8-K"
ticker: "FIBK"
cik: "0000860413"
company_name: "FIRST INTERSTATE BANCSYSTEM INC"
filed_at: "2026-05-29T20:26:09+00:00"
generated_at: "2026-05-29T20:27:37.712986+00:00"
event_type: "leadership"
sentiment: "neutral"
materiality_score: 0.4
calibrated_materiality_score: 0.4
confidence: "high"
source: SEC EDGAR
---

# First Interstate BancSystem: three directors retire per age policy; charter amended to plurality voting

## Summary
- Directors Patricia L. Moss, David L. Jahnke, Stephen M. Lacy retired May 27 after reaching age 72 per retirement policy.
- Board size reduced to 11 from 14; retirements not related to any disagreement with the Company.
- Shareholders approved charter amendment for plurality voting in contested director elections, effective May 28.
- Say-on-pay proposal passed with 68.9M votes in favor (93% of votes cast); auditor ratified with 79.5M for.

## SEC filing metadata
- accession: 0000860413-26-000048
- form_type: 8-K
- ticker: FIBK
- cik: 0000860413
- company_name: FIRST INTERSTATE BANCSYSTEM INC
- filed_at: 2026-05-29T20:26:09+00:00
- event_type: leadership
- sentiment: neutral
- materiality_score: 0.4
- calibrated_materiality_score: 0.4
- confidence: high
- sec_items: 5.02, 5.03, 5.07, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/860413/000086041326000048/0000860413-26-000048-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/860413/000086041326000048/fibk-20260527.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000860413-26-000048
- JSON: https://secwatch.observer/filing/0000860413-26-000048.json
- Plain text: https://secwatch.observer/filing/0000860413-26-000048.txt

## Source-grounded claims
- claim_id: 02ce51c4e4
  claim: Stephen M. Lacy retired as Director at FIRST INTERSTATE BANCSYSTEM INC.
  evidence_excerpt: on May 27, 2026, each of Ms. Patricia L. Moss and Messrs. David L. Jahnke and Stephen M. Lacy, each having reached the retirement age of 72, was deemed to have retired and resigned automatically from the Company’s Board of Directors
  evidence_url: https://www.sec.gov/Archives/edgar/data/860413/000086041326000048/0000860413-26-000048-index.htm
- claim_id: 03c7ba0b83
  claim: Patricia L. Moss retired as Director at FIRST INTERSTATE BANCSYSTEM INC.
  evidence_excerpt: on May 27, 2026, each of Ms. Patricia L. Moss and Messrs. David L. Jahnke and Stephen M. Lacy, each having reached the retirement age of 72, was deemed to have retired and resigned automatically from the Company’s Board of Directors
  evidence_url: https://www.sec.gov/Archives/edgar/data/860413/000086041326000048/0000860413-26-000048-index.htm
- claim_id: 5d0dcbd5e1
  claim: David L. Jahnke retired as Director at FIRST INTERSTATE BANCSYSTEM INC.
  evidence_excerpt: on May 27, 2026, each of Ms. Patricia L. Moss and Messrs. David L. Jahnke and Stephen M. Lacy, each having reached the retirement age of 72, was deemed to have retired and resigned automatically from the Company’s Board of Directors
  evidence_url: https://www.sec.gov/Archives/edgar/data/860413/000086041326000048/0000860413-26-000048-index.htm

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.