<SEC-DOCUMENT>0001193125-15-117556-index.html : 20150402
<SEC-HEADER>0001193125-15-117556.hdr.sgml : 20150402
<ACCEPTANCE-DATETIME>20150402135904
ACCESSION NUMBER:		0001193125-15-117556
CONFORMED SUBMISSION TYPE:	497
PUBLIC DOCUMENT COUNT:		1
FILED AS OF DATE:		20150402
DATE AS OF CHANGE:		20150402
EFFECTIVENESS DATE:		20150402

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			BARON INVESTMENT FUNDS TRUST (f/k/a BARON ASSET FUND)
		CENTRAL INDEX KEY:			0000810902
		IRS NUMBER:				136891420
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			0930

	FILING VALUES:
		FORM TYPE:		497
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	033-12112
		FILM NUMBER:		15746671

	BUSINESS ADDRESS:	
		STREET 1:		767 FIFTH AVE
		STREET 2:		49TH FL
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10153
		BUSINESS PHONE:		2125832000

	MAIL ADDRESS:	
		STREET 1:		767 FIFTH AVE
		STREET 2:		49TH FL
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10153

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	BARON ASSET FUND
		DATE OF NAME CHANGE:	19920703
<SERIES-AND-CLASSES-CONTRACTS-DATA>
<EXISTING-SERIES-AND-CLASSES-CONTRACTS>
<SERIES>
<OWNER-CIK>0000810902
<SERIES-ID>S000000585
<SERIES-NAME>BARON OPPORTUNITY FUND
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000001638
<CLASS-CONTRACT-NAME>BARON OPPORTUNITY FUND
<CLASS-CONTRACT-TICKER-SYMBOL>BIOPX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000077821
<CLASS-CONTRACT-NAME>Institutional Shares
<CLASS-CONTRACT-TICKER-SYMBOL>BIOIX
</CLASS-CONTRACT>
</SERIES>
</EXISTING-SERIES-AND-CLASSES-CONTRACTS>
</SERIES-AND-CLASSES-CONTRACTS-DATA>
</SEC-HEADER>
<DOCUMENT>
<TYPE>497
<SEQUENCE>1
<FILENAME>d901375d497.htm
<DESCRIPTION>BARON OPPORTUNITY FUND
<TEXT>
Document 1 - file: d901375d497.htm

</DOCUMENT>
</SEC-DOCUMENT>