{"schema_version":"secwatch.filing_event.v1","accession":"0000860413-23-000052","form_type":"8-K","ticker":"FIBK","cik":"0000860413","company_name":"FIRST INTERSTATE BANCSYSTEM INC","filed_at":"2023-03-16T23:59:59+00:00","discovered_at":"2026-05-14T18:03:48.272863+00:00","generated_at":"2026-06-18T01:23:08.534003+00:00","sec_items":["5.03","9.01"],"event_type":"other_material","sentiment":"neutral","materiality_score":0.1,"calibrated_materiality_score":0.1,"confidence":"high","headline":"First Interstate BancSystem amends bylaws to enhance shareholder proposal and nomination procedures","bullets":["Enhanced disclosure requirements for shareholder director nominations and proposals (other than Rule 14a-8 proposals).","Added provisions requiring compliance with Universal Proxy Rules, including notice of changes within 2 business days.","Requires any shareholder soliciting proxies to use a proxy card color other than white."],"urls":{"canonical":"https://secwatch.observer/filing/0000860413-23-000052","json":"https://secwatch.observer/filing/0000860413-23-000052.json","markdown":"https://secwatch.observer/filing/0000860413-23-000052.md","text":"https://secwatch.observer/filing/0000860413-23-000052.txt","edgar_index":"https://www.sec.gov/Archives/edgar/data/860413/000086041323000052/0000860413-23-000052-index.htm","edgar_primary_document":"https://www.sec.gov/Archives/edgar/data/860413/000086041323000052/fibk-20230310.htm"},"model":{"generated_by":"deepseek-v4-flash:cloud@v2","generated_at":"2026-06-18T01:23:08.534003+00:00"},"review":{"review_status":"machine_generated","human_reviewed":false,"corrected":false,"correction_note":null,"correction_timestamp":null,"superseded_by":null,"related_filings":[]},"source_grounded_claims":[{"claim_id":"b167c8ca6de7a27b37d49d86dfd7fada72cbfbbb","claim":"FIRST INTERSTATE BANCSYSTEM INC: Adopted Second Amendment to Bylaws enhancing procedural mechanics and disclosure requirements for shareholder nominations and proposals, including Universal Proxy Rules compliance (effective 2023-03-10).","evidence_excerpt":"The Board of Directors of the registrant (the “Board”), based in part upon the recommendation of the Governance and Nominating Committee of the Board, in connection with a review of the registrant’s Fourth Amended and Restated Bylaws, as amended (the “Bylaws”), adopted a Second Amendment to the Bylaws (the “Second Amendment”), effective as of March 10, 2023.","evidence_source":"SEC 8-K Item 5.03/5.05/5.06","evidence_url":"https://www.sec.gov/Archives/edgar/data/860413/000086041323000052/0000860413-23-000052-index.htm","confidence":0.9,"family_label":"Governance Changes","details":[{"label":"Change","value":"bylaw amendment"},{"label":"Effective","value":"2023-03-10"}],"fact_type":"governance_change"}],"license":"Source filings: public domain (SEC EDGAR). Summaries (headline + bullets): CC-BY-4.0; attribute https://secwatch.observer"}