<SEC-DOCUMENT>0001144204-18-007027-index.html : 20180212
<SEC-HEADER>0001144204-18-007027.hdr.sgml : 20180212
<ACCEPTANCE-DATETIME>20180209181152
ACCESSION NUMBER:		0001144204-18-007027
CONFORMED SUBMISSION TYPE:	SC 13G/A
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20180212
DATE AS OF CHANGE:		20180209

SUBJECT COMPANY:	

	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:				410423660
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G/A
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-35797
		FILM NUMBER:		18593326

	BUSINESS ADDRESS:	
		STREET 1:		1200 WEST CENTURY AVENUE
		CITY:			BISMARCK
		STATE:			ND
		ZIP:			58503
		BUSINESS PHONE:		701-530-1059

	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

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			PARNASSUS INVESTMENTS /CA
		CENTRAL INDEX KEY:			0000948669
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			CA

	FILING VALUES:
		FORM TYPE:		SC 13G/A

	BUSINESS ADDRESS:	
		STREET 1:		1 MARKET STREET #1600
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94105
		BUSINESS PHONE:		4157780200

	MAIL ADDRESS:	
		STREET 1:		1 MARKET STREET #1600
		CITY:			SAN FRANCISCO
		STATE:			CA
		ZIP:			94105
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G/A
<SEQUENCE>1
<FILENAME>tv485318_sc13ga.txt
<DESCRIPTION>SC 13G/A
<TEXT>
Document 1 - file: tv485318_sc13ga.txt

</DOCUMENT>
</SEC-DOCUMENT>