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MDU RESOURCES GROUP INC

For the period ended Mar 31, 2026. Filed May 7, 2026.

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About this filing

A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Mar 31, 2026 · Filed May 7, 2026

MDU$19.25+3.3%Stored close · as of Nov 9, 2026

Extracted filing text, with the paragraph anchors used by the comparison.

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Exhibits Index

Index

Exhibits Index
Incorporated by Reference
Exhibit Number · Exhibit Description · FiledHerewith · Form · PeriodEnded · Exhibit · FilingDate · File Number
3(a)Amended and Restated Certificate of Incorporation of MDU Resources Group, Inc.8-K3.25/8/191-03480
3(b)Bylaws of MDU Resources Group, Inc.8-K3.12/14/251-03480
**10(a)Second Amended and Restated Note Purchase and Private Shelf Agreement, dated as of December 22, 2022, by and among WBI Energy Transmission, Inc., PGIM, Inc., and the other purchasers named therein.8-K10.11/16/261-03480
**10(b)Amendment No. 1, dated as of January 14, 2026, to Second Amended and Restated Note Purchase and Private Shelf Agreement, dated as of December 22, 2022, by and among WBI Energy Transmission, Inc., PGIM, Inc., and the other purchasers named therein.8-K10.21/16/261-03480
31(a)Certification of Chief Executive Officer filed pursuant to Section 302 of the Sarbanes-Oxley Act of 2002X
31(b)Certification of Chief Financial Officer filed pursuant to Section 302 of the Sarbanes-Oxley Act of 2002X
*32Certification of Chief Executive Officer and Chief Financial Officer furnished pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002X
101.INSXBRL Instance Document - the instance document does not appear in the Interactive Data File because its XBRL tags are embedded within the Inline XBRL document
101.SCHXBRL Taxonomy Extension Schema Document
101.CALXBRL Taxonomy Extension Calculation Linkbase Document
101.DEFXBRL Taxonomy Extension Definition Linkbase Document
101.LABXBRL Taxonomy Extension Label Linkbase Document
101.PREXBRL Taxonomy Extension Presentation Linkbase Document
104Cover Page Interactive Data File (formatted as Inline XBRL and contained in Exhibit 101)

*Furnished Herewith

**Certain schedules and exhibits have been omitted pursuant to Item 601(a)(5) of Regulation S-K. The Company hereby undertakes to supplementally furnish copies of any omitted schedules and exhibits to the U.S. Securities and Exchange Commission upon request; provided that the Company may request confidential treatment pursuant to Rule 24b-2 of the Securities Exchange Act of 1934, as amended.

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The text of this filing, as the company filed it with the SEC, without its images or exhibits. This is not investment advice.