<SEC-DOCUMENT>0000100334-21-000041-index.html : 20210226
<SEC-HEADER>0000100334-21-000041.hdr.sgml : 20210226
<ACCEPTANCE-DATETIME>20210226132612
ACCESSION NUMBER:		0000100334-21-000041
CONFORMED SUBMISSION TYPE:	497K
PUBLIC DOCUMENT COUNT:		3
FILED AS OF DATE:		20210226
DATE AS OF CHANGE:		20210226
EFFECTIVENESS DATE:		20210226

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			AMERICAN CENTURY MUTUAL FUNDS, INC.
		CENTRAL INDEX KEY:			0000100334
		IRS NUMBER:				446006315
		STATE OF INCORPORATION:			MD
		FISCAL YEAR END:			1031

	FILING VALUES:
		FORM TYPE:		497K
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	002-14213
		FILM NUMBER:		21686767

	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:	AMERICAN CENTURY MUTUAL FUNDS INC
		DATE OF NAME CHANGE:	19970107

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	TWENTIETH CENTURY INVESTORS INC
		DATE OF NAME CHANGE:	19920703
<SERIES-AND-CLASSES-CONTRACTS-DATA>
<EXISTING-SERIES-AND-CLASSES-CONTRACTS>
<SERIES>
<OWNER-CIK>0000100334
<SERIES-ID>S000006195
<SERIES-NAME>ULTRA FUND
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000017060
<CLASS-CONTRACT-NAME>INVESTOR CLASS
<CLASS-CONTRACT-TICKER-SYMBOL>TWCUX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000017061
<CLASS-CONTRACT-NAME>A CLASS
<CLASS-CONTRACT-TICKER-SYMBOL>TWUAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000017062
<CLASS-CONTRACT-NAME>I CLASS
<CLASS-CONTRACT-TICKER-SYMBOL>TWUIX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000017063
<CLASS-CONTRACT-NAME>C CLASS
<CLASS-CONTRACT-TICKER-SYMBOL>TWCCX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000017064
<CLASS-CONTRACT-NAME>R CLASS
<CLASS-CONTRACT-TICKER-SYMBOL>AULRX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000131598
<CLASS-CONTRACT-NAME>R6 CLASS
<CLASS-CONTRACT-TICKER-SYMBOL>AULDX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000189739
<CLASS-CONTRACT-NAME>R5 CLASS
<CLASS-CONTRACT-TICKER-SYMBOL>AULGX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000189740
<CLASS-CONTRACT-NAME>Y CLASS
<CLASS-CONTRACT-TICKER-SYMBOL>AULYX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000214991
<CLASS-CONTRACT-NAME>G Class
<CLASS-CONTRACT-TICKER-SYMBOL>AULNX
</CLASS-CONTRACT>
</SERIES>
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<DOCUMENT>
<TYPE>497K
<SEQUENCE>1
<FILENAME>acmfultra497k.htm
<DESCRIPTION>497K
<TEXT>
Document 1 - file: acmfultra497k.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>chart-1ce99f20a018466895e1a.jpg
<TEXT>
Document 2 - file: chart-1ce99f20a018466895e1a.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>newaci_logoblkf391.jpg
<TEXT>
Document 3 - file: newaci_logoblkf391.jpg

</DOCUMENT>
</SEC-DOCUMENT>