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Otter Tail Corp — 10-K/A Filings

3 10-K/A filings on record

This page lists all 10-K/A filings submitted to the SEC by Otter Tail Corp (OTTR), sorted by most recent first. Each row links to the full filing on EdgarLookup. Otter Tail Corp has filed 3 10-K/A documents with the SEC since 2009. To view all SEC filings by Otter Tail Corp, see the full filings list.

Overview All Filings Financials Insiders
All 10-K 10-K/A 10-Q 10-Q/A 144 15-12G 3 3/A 4 4/A 424B2 424B5 5 8-K 8-K/A 8-K12G3 ARS CORRESP CT ORDER DEF 14A DEFA14A DEFR14A FWP POSASR PRE 14A S-3ASR S-8 S-8 POS SC 13D/A SC 13G SC 13G/A SCHEDULE 13G/A SD UPLOAD
Form Description Accession Number Filed Period
10-K/A 10-K/A 0001466593-26-000015 Feb 23, 2026 Dec 31, 2025
10-K/A FORM 10-K/A 0001437749-18-003034 Feb 22, 2018 Dec 31, 2017
10-K/A FORM 10-K/A (AMENDMENT NO. 1) 0001571049-17-005004 May 15, 2017 Dec 31, 2016