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First Interstate Bancsystem Inc. SEC filings

First Interstate Bancsystem (FIBK) filed its 10-Q for the quarter ended 30 June 2026 on 3 August 2026. Its latest SEC filing, on 16 September 2026, was an 8-K: officer or director change. 22 filings in the last twelve months, each 8-K by what it was about; the 10-K and proxy statement are on the documents page.

In the twelve months since 11 October 2025 First Interstate Bancsystem Inc. filed 22 documents with the SEC of the kinds listed here: 13 current reports (8-K), about 7 officer or director change; 6 regulation FD disclosure; 4 results of operations; 4 other events; 1 charter or bylaw amendment, or fiscal year change; 3 quarterly reports (10-Q), 1 shelf registration (S-3ASR), 1 additional proxy material (DEFA14A), 1 proxy statement (DEF 14A), 1 annual report to shareholders (ARS), 1 preliminary proxy (PRE 14A). The latest, filed 16 September 2026: 8-K, officer or director change. The 10-K, the 10-Qs and the proxy statement themselves, each with a link to open it, are on the documents page.

FiledFormWhat it was aboutPeriod or event dateFiling
16 September 20268-KOfficer or director change14 September 2026EDGAR
21 August 20268-KOfficer or director change21 August 2026EDGAR
3 August 202610-Qquarterly report30 June 2026EDGAR
23 July 20268-KResults of operations, Regulation FD disclosure, Other events23 July 2026EDGAR
16 July 20268-KOfficer or director change13 July 2026EDGAR
9 July 20268-KOfficer or director change9 July 2026EDGAR
29 May 20268-KOfficer or director change, Charter or bylaw amendment, or fiscal year change, Shareholder vote27 May 2026EDGAR
26 May 2026S-3ASRshelf registrationEDGAR
13 May 20268-KOfficer or director change11 May 2026EDGAR
7 May 202610-Qquarterly report31 March 2026EDGAR
29 April 20268-KResults of operations, Regulation FD disclosure, Other events29 April 2026EDGAR
16 April 2026DEFA14Aadditional proxy materialEDGAR
16 April 2026DEF 14Aproxy statement31 December 2025EDGAR
16 April 2026ARSannual report to shareholders31 December 2025EDGAR
31 March 2026PRE 14Apreliminary proxy30 March 2026EDGAR
26 February 202610-Kannual report31 December 2025EDGAR
28 January 20268-KResults of operations, Regulation FD disclosure, Other events28 January 2026EDGAR
18 November 20258-KOfficer or director change14 November 2025EDGAR
6 November 202510-Qquarterly report30 September 2025EDGAR
29 October 20258-KResults of operations, Regulation FD disclosure, Other events29 October 2025EDGAR
16 October 20258-KRegulation FD disclosure16 October 2025EDGAR
14 October 20258-KRegulation FD disclosure10 October 2025EDGAR
An 8-K is what a company files within four business days of a material event; the SEC numbers the events, and the words here are the SEC's own headings, shortened.
Read moreForm 4, Form 144, 13F and Schedule 13D and 13G have their own pages. Prospectus supplements and correspondence are not listed.

Source

The company's filing index on EDGAR, read from the SEC's submissions feed.

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