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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) August 3, 2023
MDU Resources Group Inc
(Exact name of registrant as specified in its charter)

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

1200 West Century Avenue
P.O. Box 5650
Bismarck, North Dakota 58506-5650
(Address of principal executive offices)
(Zip Code)
Registrant’s telephone number, including area code (701) 530-1000
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 Act:

(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 2.02. Results of Operations and Financial Condition and
Item 7.01. Regulation FD Disclosure.
On August 3, 2023, MDU Resources Group, Inc. (the "Company") issued a press release announcing second quarter 2023 earnings. A copy of the press release, which the Company is furnishing to the Securities and Exchange Commission, is attached as Exhibit 99 and incorporated by reference herein.
Item 9.01. Financial Statements and Exhibits.
(d) Exhibits. The following exhibits are being furnished as part of this report.
Exhibit Number Description
99 Press release issued August 3, 2023, regarding second quarter 2023 earnings.
104 Cover page interactive data file (embedded within the Inline XBRL document)
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SIGNATURE
Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.
MDU RESOURCES GROUP, INC.

Date August 3, 2023 |  | By /s/ Jason L. Vollmer
|  | Jason L. Vollmer
|  | Vice President, Chief Financial
|  | Officer and Treasurer

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