<SEC-DOCUMENT>0000052388-21-000069-index.html : 20210211
<SEC-HEADER>0000052388-21-000069.hdr.sgml : 20210211
<ACCEPTANCE-DATETIME>20210211112707
ACCESSION NUMBER:		0000052388-21-000069
CONFORMED SUBMISSION TYPE:	SC 13G
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20210211
DATE AS OF CHANGE:		20210211

SUBJECT COMPANY:	

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			NORTHWESTERN CORP
		CENTRAL INDEX KEY:			0000073088
		STANDARD INDUSTRIAL CLASSIFICATION:	ELECTRIC & OTHER SERVICES COMBINED [4931]
		IRS NUMBER:				460172280
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G
		SEC ACT:		1934 Act
		SEC FILE NUMBER:	005-36015
		FILM NUMBER:		21617680

	BUSINESS ADDRESS:	
		STREET 1:		3010 W 69TH STREET
		CITY:			SIOUX FALLS
		STATE:			SD
		ZIP:			57108
		BUSINESS PHONE:		6059782908

	MAIL ADDRESS:	
		STREET 1:		3010 W 69TH STREET
		CITY:			SIOUX FALLS
		STATE:			SD
		ZIP:			57108

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	NORTHWESTERN PUBLIC SERVICE CO
		DATE OF NAME CHANGE:	19920703

FILED BY:		

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			AMERICAN CENTURY INVESTMENT MANAGEMENT INC
		CENTRAL INDEX KEY:			0000052388
		STANDARD INDUSTRIAL CLASSIFICATION:	UNKNOWN SIC - 0000 [0000]
		IRS NUMBER:				440640487
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			1231

	FILING VALUES:
		FORM TYPE:		SC 13G

	BUSINESS ADDRESS:	
		STREET 1:		4500 MAIN STREET
		CITY:			KANSAS CITY
		STATE:			MO
		ZIP:			64111
		BUSINESS PHONE:		816-531-5575

	MAIL ADDRESS:	
		STREET 1:		4500 MAIN STREET
		CITY:			KANSAS CITY
		STATE:			MO
		ZIP:			64111

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	INVESTORS RESEARCH CORP
		DATE OF NAME CHANGE:	19920929
</SEC-HEADER>
<DOCUMENT>
<TYPE>SC 13G
<SEQUENCE>1
<FILENAME>northwesterncorp13g.htm
<DESCRIPTION>SC 13G
<TEXT>
Document 1 - file: northwesterncorp13g.htm

</DOCUMENT>
</SEC-DOCUMENT>