What SEC filings does Otter Tail Corporation submit to the SEC?

Otter Tail Corporation (OTTR) submits several types of SEC filings including Form 4 (insider transactions), Form 144 (proposed insider sales), 8-K reports (material events such as earnings releases, acquisitions, leadership changes), and periodic reports — the 10-Q (quarterly) and 10-K (annual). All filings are publicly available through SEC EDGAR.

What does a Form 4 filing tell me about OTTR?

A Form 4 for OTTR discloses a transaction by a company insider — typically a director, officer, or 10%+ shareholder. It shows the source-reported date, number of shares, price, and updated ownership. These facts do not establish motive or predict future returns.

How do I interpret an 8-K filing from Otter Tail Corporation?

An 8-K signals a material event requiring prompt disclosure. Common triggers include earnings pre-announcements, acquisitions, leadership appointments or departures, credit changes, or regulatory actions. Read the item codes inside the filing to understand exactly what was disclosed before drawing conclusions.

What is the difference between a 10-K and 10-Q for OTTR?

The 10-K is Otter Tail Corporation's annual report with fully audited financial statements, comprehensive MD&A, and complete risk factor disclosures — filed 60–90 days after fiscal year-end. The 10-Q is a lighter quarterly report with unaudited financials filed for the first three quarters. Together they provide a continuous financial picture of the company.

Where can I see all OTTR SEC filings directly on EDGAR?

You can view all historical Otter Tail Corporation filings on the SEC EDGAR company page for OTTR. Each filing card on this page links directly to the original SEC document.

How often does Otter Tail Corporation file with the SEC?

Otter Tail Corporation files one 10-K per year and up to three 10-Qs per year. Form 4 insider transactions must be reported within two business days of each trade, so the frequency depends on how often insiders are buying or selling OTTR shares. 8-K filings occur whenever a material event happens — which can be several times per quarter for an active company.

OTTR SEC Filing News — Otter Tail Corporation

Latest SEC filings for Otter Tail Corporation (OTTR) explained in plain English. Covers insider buying and selling (Form 4), proposed insider sales (Form 144), material company events (8-K), and quarterly & annual reports (10-Q / 10-K). StrongBuyAnalytics provides navigation and brief excerpts or summaries; original filings remain at the SEC/source links and were authored by their filers, not StrongBuyAnalytics. Filing dates shown are source dates. Coverage and detection can be delayed or incomplete because of SEC availability, amendments, parsing, caching, or outages. Latest source filing date shown: 2026-09-01.

Otter Tail Corporation, together with its subsidiaries, engages in electric utility, manufacturing, and plastic pipe businesses in the United States. It operates through three segments: Electric, Manufacturing, and Plastics. The Electric segment generates, purchases, transmissions, distributes, and sells electric energy in Minnesota, North Dakota, and South Dakota; and operates as a participant in the Midcontinent Independent System Operator markets. This segment generates electricity through co…

Sector: Industrials Industry: Conglomerates Market Cap: $3.7B CIK: 1466593

Total Filings

Bullish Classifications

Bearish Classifications

Insider Transactions

Material Events (8-K)

Periodic Reports

Rule-based classifications for OTTR currently lean bearish. Of the 20 filing records displayed, 2 carry bearish classifications (such as insider sales or negative 8-K disclosures) versus 0 bullish. This does not necessarily signal fundamental deterioration — insiders sell for many reasons — but it is worth monitoring alongside the company's core financial metrics.

OTTR Filing Activity Snapshot 2026-04-14 — 2026-09-01

Insider Transactions (Form 4)

0 buys vs 2 sells

Net insider selling in this period — insiders sell for many reasons beyond conviction.

Largest Form 144 Filing

$328.3K

Paul Knutson · 2026-08-07

3,500 shares · Form 144

Form 144 Notices

Proposed insider sale filed — Form 144 is a notice of intent, not a confirmed transaction. Actual sales are confirmed via Form 4.

Insider Transactions 8 · Forms 3, 4 and 5

A Form 4 is filed within two business days of a company insider — an officer, a director, or a holder of more than ten percent of the stock — changing their position in the shares. All 8 filings in this group are Form 4s for Otter Tail Corporation.

The difficulty with reading these filings as a group is that a single form type covers transactions that mean entirely different things. An executive spending their own money to buy stock and an executive having shares withheld to pay tax on a vesting grant both appear as a Form 4. Every filing below is therefore tagged with the nature of the underlying transaction, taken from the transaction code reported on the form itself.

Across the 8 insider filings shown, the breakdown is 6 compensation award and 2 open-market sale. 2 of them involved a discretionary open-market trade; the rest are compensation and administrative mechanics.

What each transaction type means

Compensation award ×6: Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.
Open-market sale ×2: The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Form 4 Open-market sale Insider Selling 2026-08-12

OTTR insider KNUTSON PAUL L (VP, Human Resources) sold 725 shares (~$68.2K)

KNUTSON PAUL L, listed as VP, Human Resources at Otter Tail Corp, reported an open-market sale of 725 OTTR shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	250	$92.84	$23.2K
`S`	Open-market sale	475	$94.63	$44.9K

Filing: Form 4 (Insider Transaction) Insider: KNUTSON PAUL L (VP, Human Resources) Shares: 725 Est. Value: $68.2K

View on SEC EDGAR → Open Filing Document →

Form 4 Open-market sale Insider Selling 2026-08-11

OTTR insider KNUTSON PAUL L (VP, Human Resources) sold 3,500 shares (~$325.9K)

KNUTSON PAUL L, listed as VP, Human Resources at Otter Tail Corp, reported an open-market sale of 3,500 OTTR shares in a Form 4 filing. This is a confirmed insider sale, not just a proposed sale notice.

The insider sold shares on the open market. Sales may be discretionary or executed automatically under a pre-arranged Rule 10b5-1 trading plan, and a Form 4 does not always make clear which applies.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`S`	Open-market sale	3,500	$93.11	$325.9K
`G`	Gift	725	—	—
`G`	Gift	475	—	—
`G`	Gift	250	—	—

Filing: Form 4 (Insider Transaction) Insider: KNUTSON PAUL L (VP, Human Resources) Shares: 3,500 Est. Value: $325.9K

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-04-15

OTTR insider Form 4 filed for equity award, exercise, or tax withholding

Wahlund Todd R (Senior Vice President) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award derivative · Restricted Stock Units	300	—	—

Filing: Form 4 (Insider Transaction) Insider: Wahlund Todd R (Senior Vice President)

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-04-15

OTTR insider Form 4 filed for equity award, exercise, or tax withholding

ROGELSTAD TIMOTHY J (President) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award derivative · Restricted Stock Units	1,400	—	—

Filing: Form 4 (Insider Transaction) Insider: ROGELSTAD TIMOTHY J (President)

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-04-15

OTTR insider Form 4 filed for equity award, exercise, or tax withholding

Smestad Jennifer O. (SVP General Counsel & Corp Sec) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award derivative · Restricted Stock Units	5,800	—	—

Filing: Form 4 (Insider Transaction) Insider: Smestad Jennifer O. (SVP General Counsel & Corp Sec)

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-04-15

OTTR insider Form 4 filed for equity award, exercise, or tax withholding

Nelson Tyler J (VP, Chief Financial Officer) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award derivative · Restricted Stock Units	800	—	—

Filing: Form 4 (Insider Transaction) Insider: Nelson Tyler J (VP, Chief Financial Officer)

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-04-14

OTTR insider Form 4 filed for equity award, exercise, or tax withholding

Johnson Kathryn O (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	1,500	—	—

Filing: Form 4 (Insider Transaction) Insider: Johnson Kathryn O (Director) Shares: 1,500

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-04-14

OTTR insider Form 4 filed for equity award, exercise, or tax withholding

Ludford Mary E (Director) filed a Form 4 covering compensation-related activity such as stock awards, option exercises, conversions, or tax withholding. These filings are usually neutral.

Shares were granted as compensation rather than purchased. No cash changed hands, so the filing reflects a pay decision by the company, not a judgement about the price.

Transactions reported on this filing
Code	Nature	Shares	Price	Value
`A`	Compensation award	1,500	—	—

Filing: Form 4 (Insider Transaction) Insider: Ludford Mary E (Director) Shares: 1,500

View on SEC EDGAR → Open Filing Document →

Proposed Insider Sales 1 · Form 144

A Form 144 is a notice of intent to sell restricted or control securities. It is not a record that anything was sold. Otter Tail Corporation has 1 such notice in this period.

The distinction matters because a Form 144 is frequently reported as though it were a completed insider sale. The filer may sell all of the shares covered, some of them, or none at all, and there is no obligation to update the notice either way. A sale that is actually executed by an officer or director shows up separately on a Form 4, which is the filing to check before treating a proposed sale as a real one.

Form 144 Proposed Insider Sale 2026-08-07

OTTR Form 144 filed for proposed insider sale by Paul Knutson (3,500 shares) ~$328.3K

Paul Knutson filed a Form 144 with the SEC indicating intent to sell OTTR (Otter Tail Corp) shares. Form 144 reflects a proposed sale, not a completed transaction. The actual execution, if any, would typically appear later in a Form 4.

Filing: Form 144 (Proposed Sale Notice) Insider: Paul Knutson Shares: 3,500 Est. Value: $328.3K

View on SEC EDGAR → Open Filing Document →

Material Events 9 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There are 9 in this period for Otter Tail Corporation. Each 8-K names the item number it is filed under, and that number is the fastest way to tell a routine disclosure from a consequential one.

Item 2.02 is an earnings release, Item 5.02 is a change of directors or officers, and Item 1.01 or 2.01 covers a material agreement or a completed acquisition. Item 7.01 and Item 8.01 are the general-purpose disclosure items and carry no fixed meaning on their own.

Form 8-K Material Company Update 2026-09-01