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Otter Tail Corp. SEC filings

Otter Tail (OTTR) filed its 10-Q for the quarter ended 30 June 2026 on 5 August 2026. Its latest SEC filing, on 1 September 2026, was an 8-K: officer or director change. 23 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 Otter Tail Corp. filed 23 documents with the SEC of the kinds listed here: 13 current reports (8-K), about 4 results of operations; 3 officer or director change; 3 material agreement; 2 new financial obligation; 2 regulation FD disclosure; 3 quarterly reports (10-Q), 1 conflict minerals report (SD), 1 annual report to shareholders (ARS), 1 additional proxy material (DEFA14A), 1 proxy statement (DEF 14A), 1 amended annual report (10-K/A). The latest, filed 1 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
1 September 20268-KOfficer or director change28 August 2026EDGAR
5 August 202610-Qquarterly report30 June 2026EDGAR
4 August 20268-KResults of operations3 August 2026EDGAR
18 June 20268-KMaterial agreement17 June 2026EDGAR
5 June 20268-KNew financial obligation4 June 2026EDGAR
29 May 2026SDconflict minerals reportEDGAR
29 May 20268-KMaterial agreement28 May 2026EDGAR
15 May 20268-KOther events15 May 2026EDGAR
6 May 202610-Qquarterly report31 March 2026EDGAR
5 May 20268-KResults of operations4 May 2026EDGAR
15 April 20268-KShareholder vote13 April 2026EDGAR
14 April 20268-KOfficer or director change, Regulation FD disclosure13 April 2026EDGAR
23 March 20268-KMaterial agreement, New financial obligation19 March 2026EDGAR
2 March 2026ARSannual report to shareholders31 December 2025EDGAR
2 March 2026DEFA14Aadditional proxy materialEDGAR
2 March 2026DEF 14Aproxy statement13 April 2026EDGAR
23 February 202610-K/Aamended annual report31 December 2025EDGAR
18 February 2026PRE 14Apreliminary proxy13 April 2026EDGAR
18 February 202610-Kannual report31 December 2025EDGAR
17 February 20268-KResults of operations16 February 2026EDGAR
18 December 20258-KOfficer or director change, Regulation FD disclosure16 December 2025EDGAR
5 November 202510-Qquarterly report30 September 2025EDGAR
4 November 20258-KResults of operations3 November 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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