# EDGAR Filing Document

**Accession Number:** 0000067716
**File Stem:** 0000067716-23-000036
**Filing Date:** 2023-3
**Character Count:** 2386
**Document Hash:** 623a9392dde61dd44b4391550a668912
**Contains OCR:** False
**Source Format:** 

## Filing Content

## Filing Summary
**0000067716-23-000036.hdr.sgml**: 20230324

**ACCESSION NUMBER**: 0000067716-23-000036

**CONFORMED SUBMISSION TYPE**: DEFA14A

**PUBLIC DOCUMENT COUNT**: 3

**FILED AS OF DATE**: 20230324

**DATE AS OF CHANGE**: 20230324

**FILER**: 

**COMPANY DATA:**
- **COMPANY CONFORMED NAME:** MDU RESOURCES GROUP INC
- **CENTRAL INDEX KEY:** 0000067716
- **STANDARD INDUSTRIAL CLASSIFICATION:** MINING, QUARRYING OF NONMETALLIC MINERALS (NO FUELS) [1400]
- **IRS NUMBER:** 301133956
- **FISCAL YEAR END:** 1231

**FILING VALUES:**
- **FORM TYPE:** DEFA14A
- **SEC ACT:** 1934 Act
- **SEC FILE NUMBER:** 001-03480
- **FILM NUMBER:** 23758338

**BUSINESS ADDRESS:**
- **STREET 1:** 1200 WEST CENTURY AVENUE
- **CITY:** BISMARCK
- **STATE:** ND
- **ZIP:** 58503
- **BUSINESS PHONE:** 701-530-1000

**MAIL ADDRESS:**
- **STREET 1:** 1200 WEST CENTURY AVENUE
- **CITY:** BISMARCK
- **STATE:** ND
- **ZIP:** 58503

**FORMER COMPANY:**
- **FORMER CONFORMED NAME:** MONTANA DAKOTA UTILITIES CO
- **DATE OF NAME CHANGE:** 19850429

**UNITED STATES**

**SECURITIES AND EXCHANGE COMMISSION** 

**Washington, D.C. 20549**

**SCHEDULE 14A INFORMATION**

Proxy Statement Pursuant to Section 14(a) of

the Securities Exchange Act of 1934

(Amendment No.&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;)

Filed by the Registrant 🗷

Filed by a party other than the Registrant ◻

Check the appropriate box:

◻&nbsp;&nbsp;&nbsp;&nbsp;Preliminary Proxy Statement

◻&nbsp;&nbsp;&nbsp;&nbsp;Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2))

◻Definitive Proxy Statement

🗷&nbsp;&nbsp;&nbsp;&nbsp;Definitive Additional Materials

◻&nbsp;&nbsp;&nbsp;&nbsp;Soliciting Material under §240.14a-12

**MDU Resources Group, Inc.**

(Name of Registrant as Specified In Its Charter)

____________________________________________________________

(Name of Person(s) Filing Proxy Statement, if other than the Registrant)

Payment of Filing Fee (Check all boxes that apply):

🗷&nbsp;&nbsp;&nbsp;&nbsp;No fee required

◻&nbsp;&nbsp;&nbsp;&nbsp;Fee paid previously with preliminary materials

◻&nbsp;&nbsp;&nbsp;&nbsp;Fee computed on table in exhibit required by Item 25(b) per Exchange Act Rules 14a-6(i)(1) and 0-11

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