MDU (MDU) files 8-K on new five-year capital investment plan

Rhea-AI Filing Summary

MDU Resources Group, Inc. filed a Form 8-K to report that on November 20, 2025 it issued a news release announcing a five-year capital investment plan. This filing is made under Regulation FD, which is intended to ensure that important information is shared broadly with the market.

The detailed contents of the capital investment plan are provided in the news release attached as Exhibit 99 to the filing and incorporated by reference. The company’s common stock continues to trade on the New York Stock Exchange under the symbol MDU.

8-K Event Classification

2 items: 7.01, 9.01

2 items

Item 7.01 Regulation FD Disclosure Disclosure

Material non-public information disclosed under Regulation Fair Disclosure, often investor presentations or guidance.

Item 9.01 Financial Statements and Exhibits Exhibits

Financial statements, pro forma financial information, and exhibit attachments filed with this report.

Understanding 8-K Material Events →

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT

Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of earliest event reported): November 20, 2025

MDU Resources Group, Inc.

(Exact name of registrant as specified in its charter)

Delaware			1-03480			30-1133956
(State or other jurisdiction of			(Commission File Number)			(IRS Employer Identification No.)
incorporation)

1200 West Century Avenue

P.O. Box 5650

Bismarck, North Dakota

(Address of principal executive offices)

58506

(Zip Code)

Registrant’s telephone number, including area code: (701) 530-1000

N/A

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

☐ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

☐ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

☐ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

☐ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Securities Exchange Act of 1934:

Title of each class

Trading Symbol(s)

Name of each exchange on which registered

Common Stock, par value $1.00 per share

MDU

New York Stock Exchange

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 or Rule 12b-2 of the Securities Exchange Act of 1934.

Emerging growth company ☐

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ☐

Item 7.01. Regulation FD Disclosure.

    On November 20, 2025, MDU Resources Group, Inc. (the "Company") issued a news release announcing its five-year capital investment plan. A copy of the news release, which the Company is furnishing to the U.S. Securities and Exchange Commission, is attached as Exhibit 99 and incorporated herein by reference.

Item 9.01. Financial Statements and Exhibits.

(d)     Exhibits.

Exhibit No.						Description
99						News release, dated November 20, 2025, announcing five-year capital investment plan.
104						Cover Page Interactive Data File (embedded within the Inline XBRL document).

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SIGNATURE

Pursuant to the requirements of the Exchange Act, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

			MDU RESOURCES GROUP, INC.
Date:  November 20, 2025			By: /s/ Jason L. Vollmer
			Jason L. Vollmer
			Chief Financial Officer

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FAQ

What did MDU (MDU) announce in this Form 8-K?

MDU Resources Group, Inc. reported that on November 20, 2025 it issued a news release announcing a five-year capital investment plan, which is furnished as Exhibit 99.

Which SEC item does this MDU 8-K relate to?

The Form 8-K from MDU Resources Group, Inc. relates to Item 7.01, Regulation FD Disclosure, covering the public release of important company information.

Where can investors find details of MDU’s five-year capital investment plan?

Details of the plan are contained in the news release attached as Exhibit 99 to the Form 8-K and incorporated by reference.

Does the MDU 8-K include any financial statements?

Under Item 9.01, MDU Resources Group, Inc. lists Exhibit 99 (the news release) and Exhibit 104 (the cover page interactive data file); no separate financial statements are listed.

What exchange is MDU Resources Group, Inc. common stock listed on?

MDU Resources Group, Inc. common stock, par value $1.00 per share, trades on the New York Stock Exchange under the symbol MDU.

Who signed this MDU Form 8-K?

The Form 8-K was signed on behalf of MDU Resources Group, Inc. by Jason L. Vollmer, Chief Financial Officer, dated November 20, 2025.