OTTR · Nasdaq · CIK 0001466593

Otter Tail Corp

Otter Tail Corp’s most recent SEC filing in our snapshot is a Form 8-K filed on Sep 1, 2026. In fiscal 2025 (year ended Dec 31, 2025) it reported revenue of $1.3B and net income of $275.9M, according to its XBRL data on EDGAR. Its EDGAR record lists 28 Form 4 insider filings from the 12 months before our last refresh.

SEC EDGAR snapshot updated Oct 27, 2026, 11:27 PM EDT. See all filings on sec.gov.

Revenue, FY2025
$1.3B
Net income, FY2025
$275.9M
Form 4 filings on record, past 12 months
28

Company overview

Legal name (as filed)
Otter Tail Corp
Ticker
OTTR
SEC Central Index Key (CIK)
0001466593
Industry (SIC)
Electric Services (code 4911)
Business address
FERGUS FALLS, MN
State or country of incorporation
MN
Fiscal year ends
December 31
SEC filer category
Large accelerated filer
Position in SEC ticker list
#1537 of the 3,000 companies we track

Five-year financial highlights

Full-year figures from Otter Tail Corp’s annual reports, as tagged in XBRL and published by the SEC. Amounts are in U.S. dollars; the fiscal year is named for the calendar year in which it ends.

Revenue
$1.2BFY2021$1.5BFY2022$1.4BFY2023$1.3BFY2024$1.3BFY2025
Net income
$176.8MFY2021$284.2MFY2022$294.2MFY2023$301.7MFY2024$275.9MFY2025
OTTR annual results
ItemFY2021
ended Dec 31, 2021		FY2022
ended Dec 31, 2022		FY2023
ended Dec 31, 2023		FY2024
ended Dec 31, 2024		FY2025
ended Dec 31, 2025
Revenue$1.2B$1.5B$1.4B$1.3B$1.3B
Net income$176.8M$284.2M$294.2M$301.7M$275.9M
Diluted EPS$4.23$6.78$7.00$7.17$6.55
Total assets$2.8B$2.9B$3.2B$3.7B$4.0B
Cash and equivalents$1.5M$119.0M$230.4M$294.7M$386.2M

XBRL tags used: revenue = Revenues; netIncome = NetIncomeLoss; assets = Assets; eps = EarningsPerShareDiluted; cash = CashAndCashEquivalentsAtCarryingValue. EPS is shown as originally reported for each year and may not be adjusted for later stock splits. A dash means the company did not report that item in a form we could match.

How to read these numbers

Revenue is the money a company brings in from selling its products and services; net income is what is left after all expenses, interest and taxes. Diluted EPS spreads net income across every share that could exist if options and convertible securities were exercised. Total assets and cash are balance-sheet figures measured on the last day of the fiscal year. For the full story — segment results, one-time charges, guidance — read Management’s Discussion and Analysis in the Form 10-K.

Latest key reports

The most recent filing of each major report type, even if it falls outside the 40 newest filings below.

OTTR latest annual, quarterly, current and proxy reports
FiledFormWhat it isOriginal
Feb 18, 202610-KAnnual report· period Dec 31, 2025Document · Index
Aug 5, 202610-QQuarterly report· period Jun 30, 2026Document · Index
Sep 1, 20268-KDirector or officer change· period Aug 28, 2026Document · Index
Mar 2, 2026DEF 14ADefinitive proxy statement· period Apr 13, 2026Document · Index

Recent SEC filings

The 40 newest documents filed by or about Otter Tail Corp, by form type:

4 ×168-K ×10SCHEDULE 13G ×310-Q ×23 ×1144 ×1SD ×1SCHEDULE 13G/A ×1ARS ×1DEFA14A ×1DEF 14A ×110-K/A ×1PRE 14A ×1
OTTR recent filings
FiledFormWhat it isOriginal
Sep 1, 20268-KDirector or officer change· period Aug 28, 2026Document · Index
Aug 12, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 10, 2026Document · Index
Aug 11, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 7, 2026Document · Index
Aug 7, 2026144Notice of proposed sale of securitiesDocument · Index
Aug 7, 2026SCHEDULE 13GPassive beneficial ownership report (over 5%)Document · Index
Aug 5, 202610-QQuarterly report· period Jun 30, 2026Document · Index
Aug 4, 20268-KResults of operations· period Aug 3, 2026Document · Index
Jun 18, 20268-KMaterial agreement· period Jun 17, 2026Document · Index
Jun 5, 20268-KNew financial obligation· period Jun 4, 2026Document · Index
May 29, 2026SDSpecialized disclosure report (conflict minerals)Document · Index
May 29, 20268-KMaterial agreement· period May 28, 2026Document · Index
May 15, 20268-KOther events· period May 15, 2026Document · Index
May 6, 202610-QQuarterly report· period Mar 31, 2026Document · Index
May 5, 20268-KResults of operations· period May 4, 2026Document · Index
Apr 30, 2026SCHEDULE 13GPassive beneficial ownership report (over 5%)Document · Index
Apr 29, 2026SCHEDULE 13GPassive beneficial ownership report (over 5%)Document · Index
Apr 15, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 13, 2026Document · Index
Apr 15, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 13, 2026Document · Index
Apr 15, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 13, 2026Document · Index
Apr 15, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 13, 2026Document · Index
Apr 15, 20268-KShareholder vote results· period Apr 13, 2026Document · Index
Apr 14, 20263Initial statement of beneficial ownership· period Apr 13, 2026Document · Index
Apr 14, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 13, 2026Document · Index
Apr 14, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 13, 2026Document · Index
Apr 14, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 13, 2026Document · Index
Apr 14, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 13, 2026Document · Index
Apr 14, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 13, 2026Document · Index
Apr 14, 20268-KDirector or officer change; Regulation FD disclosure· period Apr 13, 2026Document · Index
Apr 14, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 13, 2026Document · Index
Apr 14, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 13, 2026Document · Index
Apr 14, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 13, 2026Document · Index
Apr 14, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 13, 2026Document · Index
Apr 9, 20264Statement of changes in beneficial ownership (insider trade)· period Apr 8, 2026Document · Index
Mar 27, 2026SCHEDULE 13G/APassive beneficial ownership report (over 5%)Document · Index
Mar 23, 20268-KMaterial agreement; New financial obligation· period Mar 19, 2026Document · Index
Mar 2, 2026ARSARS· period Dec 31, 2025Document · Index
Mar 2, 2026DEFA14AAdditional proxy soliciting materialsDocument · Index
Mar 2, 2026DEF 14ADefinitive proxy statement· period Apr 13, 2026Document · Index
Feb 23, 202610-K/AAmended annual report· period Dec 31, 2025Document · Index
Feb 18, 2026PRE 14APRE 14A· period Apr 13, 2026Document · Index

Insider filing activity

28 Form 4 filings appear in Otter Tail Corp’s EDGAR record between Oct 28, 2025 and our last refresh. Most are reports by the company’s own directors, officers and 10% owners, but EDGAR also lists a Form 4 under a company when the company itself is the insider — for example, when it owns more than 10% of another public company. Foreign private issuers’ own insiders generally do not file Form 4. A high count is not by itself a signal: many Form 4s report routine stock awards, tax withholding or sales under pre-arranged Rule 10b5-1 plans. Open each filing to see the transaction code, share count and price. What a Form 4 shows.

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Source

  • U.S. Securities and Exchange Commission, EDGAR submissions for CIK 0001466593 and XBRL company facts. Otter Tail Corp on EDGAR.
  • Snapshot updated Oct 27, 2026, 11:27 PM EDT. The SEC does not endorse OpenFilings. Company names and tickers are used only to identify the filer; no logos are shown.

Not investment advice. This page summarizes public SEC filings for information only. Figures may contain errors or omissions; confirm everything in the original filing before relying on it.