What SEC filings does MDU Resources Group, Inc. submit to the SEC?

MDU Resources Group, Inc. (MDU) 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 MDU?

A Form 4 for MDU 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 MDU Resources Group, Inc.?

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 MDU?

The 10-K is MDU Resources Group, Inc.'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 MDU SEC filings directly on EDGAR?

You can view all historical MDU Resources Group, Inc. filings on the SEC EDGAR company page for MDU. Each filing card on this page links directly to the original SEC document.

How often does MDU Resources Group, Inc. file with the SEC?

MDU Resources Group, Inc. 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 MDU shares. 8-K filings occur whenever a material event happens — which can be several times per quarter for an active company.

MDU SEC Filing News — MDU Resources Group, Inc.

Latest SEC filings for MDU Resources Group, Inc. (MDU) 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: 2026-10-01.

MDU Resources Group, Inc. engages in the regulated energy delivery businesses in the United States. The company operates through three segments: Electric, Natural Gas Distribution, and Pipeline. It generates, transmits, and distributes electricity in Montana, North Dakota, South Dakota, and Wyoming through approximately 3,400 miles of transmission and 4,900 miles of distribution lines, as well as 86 transmission and 299 distribution substations. The company also distributes natural gas in Idaho,…

Sector: Utilities Industry: Utilities - Regulated Gas Market Cap: $4.0B CIK: 67716

Total Filings

Bullish Classifications

Bearish Classifications

Insider Transactions

Material Events (8-K)

Periodic Reports

What you're looking at: Each item below is parsed from an actual SEC filing submitted by MDU Resources Group, Inc.. Form 4 = confirmed insider transaction · Form 144 = proposed sale notice · 8-K = material event (earnings, M&A, leadership change, etc.) · 10-Q / 10-K = quarterly / annual report.

MDU Filing Activity Snapshot 2026-02-19 — 2026-10-01

Insider Transactions (Form 4)

0 buys vs 0 sells

Insider buying and selling activity is balanced in this period.

Insider Transactions 14 · 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 14 filings in this group are Form 4s for MDU Resources Group, Inc.

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 14 insider filings shown, the breakdown is 14 compensation award. None of the classified filings involved a discretionary open-market trade, so this period says nothing about what insiders think of the price.

What each transaction type means

Compensation award ×14: 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.

Form 4 Compensation award Tax / Compensation Filing 2026-10-01

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

DURKIN MARIAN M (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	172	—	—

Filing: Form 4 (Insider Transaction) Insider: DURKIN MARIAN M (Director) Shares: 172

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-10-01

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

Dosch Vernon A. (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	1,462	—	—

Filing: Form 4 (Insider Transaction) Insider: Dosch Vernon A. (Director) Shares: 1,462

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-07-01

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

DURKIN MARIAN M (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	152	—	—

Filing: Form 4 (Insider Transaction) Insider: DURKIN MARIAN M (Director) Shares: 152

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-07-01

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

Dosch Vernon A. (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	1,293	—	—

Filing: Form 4 (Insider Transaction) Insider: Dosch Vernon A. (Director) Shares: 1,293

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-04-01

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

DURKIN MARIAN M (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	157	—	—

Filing: Form 4 (Insider Transaction) Insider: DURKIN MARIAN M (Director) Shares: 157

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-04-01

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

Dosch Vernon A. (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	1,334	—	—

Filing: Form 4 (Insider Transaction) Insider: Dosch Vernon A. (Director) Shares: 1,334

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-02-19

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

Vollmer Jason L (CFO) 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	15,229	—	—
`F`	Tax withholding on vested shares	36,766	$20.36	$748.6K

Filing: Form 4 (Insider Transaction) Insider: Vollmer Jason L (CFO) Shares: 51,995

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-02-19

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

Foti Anthony Donald (CLO & Corporate Secretary) 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	8,161	—	—

Filing: Form 4 (Insider Transaction) Insider: Foti Anthony Donald (CLO & Corporate Secretary) Shares: 8,161

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-02-19

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

Sievert Stephanie A (ChiefAccntg&RegAffairsOfficer) 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	4,544	—	—
`F`	Tax withholding on vested shares	10,438	$20.36	$212.5K

Filing: Form 4 (Insider Transaction) Insider: Sievert Stephanie A (ChiefAccntg&RegAffairsOfficer) Shares: 14,982

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-02-19

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

Boese Dyke A. (CIO) 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	3,702	—	—

Filing: Form 4 (Insider Transaction) Insider: Boese Dyke A. (CIO) Shares: 3,702

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-02-19

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

Senger Garret (Chief Utilities 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	6,920	—	—
`F`	Tax withholding on vested shares	8,167	$20.36	$166.3K

Filing: Form 4 (Insider Transaction) Insider: Senger Garret (Chief Utilities Officer) Shares: 15,087

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-02-19

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

Kivisto Nicole A (Director, President & CEO) 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	45,037	—	—
`F`	Tax withholding on vested shares	35,668	$20.36	$726.2K

Filing: Form 4 (Insider Transaction) Insider: Kivisto Nicole A (Director, President & CEO) Shares: 80,705

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-02-19

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

Jones Anne M (ChiefHRSafety&AdminOfficer) 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	5,523	—	—
`F`	Tax withholding on vested shares	12,010	$20.36	$244.5K

Filing: Form 4 (Insider Transaction) Insider: Jones Anne M (ChiefHRSafety&AdminOfficer) Shares: 17,533

View on SEC EDGAR → Open Filing Document →

Form 4 Compensation award Tax / Compensation Filing 2026-02-19

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

Johnson Rob L. (President-WBI) 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	5,830	—	—
`F`	Tax withholding on vested shares	10,630	$20.36	$216.4K

Filing: Form 4 (Insider Transaction) Insider: Johnson Rob L. (President-WBI) Shares: 16,460

View on SEC EDGAR → Open Filing Document →

Material Events 3 · Form 8-K

An 8-K reports a material event in the window between scheduled reports. There are 3 in this period for MDU Resources Group, Inc. 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 2026-08-06

MDU filed 8-K — material company event

MDU RESOURCES GROUP INC filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-05-13

MDU filed 8-K — material company event

MDU RESOURCES GROUP INC filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Form 8-K Material Company Update 2026-05-07

MDU filed 8-K — material company event

MDU RESOURCES GROUP INC filed an 8-K with the SEC reporting a material event. Summary unavailable — view the original SEC filing for the full text.

Filing: 8-K (Material Event)

View on SEC EDGAR → Open Filing Document →

Periodic Reports 3 · Forms 10-K and 10-Q

The periodic reports are where the audited and reviewed financial statements live. This period contains 1 annual report (10-K) and 2 quarterly reports (10-Q) for MDU Resources Group, Inc.

The two are not equivalent in weight. A 10-K is audited by an external firm and includes the full risk factor disclosure, business description and management discussion; a 10-Q is unaudited, reviewed rather than examined, and much shorter. When a figure in a quarterly report is later revised, the annual report is usually where the correction appears.

An amended report — 10-K/A or 10-Q/A — restates or corrects something in the original filing, and is worth reading against the version it replaces.

Form 10-Q Quarterly Report 2026-08-06

MDU filed Quarterly Report (10-Q)

MDU RESOURCES GROUP INC filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.

Filing: 10-Q (Quarterly Report)

View on SEC EDGAR → Open Filing Document →

Form 10-Q Quarterly Report 2026-05-07

MDU filed Quarterly Report (10-Q)

MDU RESOURCES GROUP INC filed its quarterly report with the SEC. This report includes unaudited financial statements and management discussion for the quarter.

Filing: 10-Q (Quarterly Report)

View on SEC EDGAR → Open Filing Document →

Form 10-K Annual Report 2026-02-20

MDU filed Annual Report (10-K)

MDU RESOURCES GROUP INC filed its annual report with the SEC. This report includes audited financial statements, business overview, risk factors, and management discussion.

Filing: 10-K (Annual Report)

View on SEC EDGAR → Open Filing Document →

How we classify MDU Resources Group, Inc.'s filings

Straight from EDGAR

Each displayed record links to an original source document. StrongBuyAnalytics provides navigation and brief excerpts or summaries, not the filing itself. Parsing may omit context or contain errors, so read the original document in full.

Transaction codes, not guesswork

The nature shown on each insider filing comes from the transaction code the filer entered on the form itself — P for an open-market purchase, A for a compensation award, F for shares withheld to pay tax, M for an option exercise. Where one filing contains several codes, the transaction table lists them line by line.

Why the distinction matters

Insider activity is routinely summarised as buying or selling, which flattens together decisions that mean very different things. Shares withheld for tax on a vesting grant are an automatic administrative step; shares bought on the open market are someone committing their own money at the current price.

What this page does not tell you

A filing records what happened, not why. Form 4 does not always disclose whether a sale was executed under a pre-arranged Rule 10b5-1 plan, and no single filing is a basis for a decision on MDU. Read these alongside the fundamentals rather than in isolation.

Frequently Asked Questions — MDU SEC Filings

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MDU Full Analysis

Publisher, sources & limitations — September 15, 2026. StrongBuyAnalytics provides navigation and brief excerpts or summaries for educational use. Original filings remain at SEC EDGAR or other displayed source links; StrongBuyAnalytics does not author them. Filing dates are source dates, not publication dates for this page. Coverage can be delayed, incomplete, amended, or unavailable because of SEC/source availability, parsing, caching, or outages. Verify every material statement in the original filing.

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