<SEC-DOCUMENT>0001193125-19-018354-index.html : 20190128
<SEC-HEADER>0001193125-19-018354.hdr.sgml : 20190128
<ACCEPTANCE-DATETIME>20190128124612
ACCESSION NUMBER:		0001193125-19-018354
CONFORMED SUBMISSION TYPE:	497
PUBLIC DOCUMENT COUNT:		10
FILED AS OF DATE:		20190128
DATE AS OF CHANGE:		20190128
EFFECTIVENESS DATE:		20190128

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:		19544531

	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>S000000582
<SERIES-NAME>BARON ASSET FUND
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000001635
<CLASS-CONTRACT-NAME>BARON ASSET FUND
<CLASS-CONTRACT-TICKER-SYMBOL>BARAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000077818
<CLASS-CONTRACT-NAME>Institutional Shares
<CLASS-CONTRACT-TICKER-SYMBOL>BARIX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000165210
<CLASS-CONTRACT-NAME>R6 Shares
<CLASS-CONTRACT-TICKER-SYMBOL>BARUX
</CLASS-CONTRACT>
</SERIES>
<SERIES>
<OWNER-CIK>0000810902
<SERIES-ID>S000000583
<SERIES-NAME>BARON GROWTH FUND
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000001636
<CLASS-CONTRACT-NAME>BARON GROWTH FUND
<CLASS-CONTRACT-TICKER-SYMBOL>BGRFX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000077819
<CLASS-CONTRACT-NAME>Institutional Shares
<CLASS-CONTRACT-TICKER-SYMBOL>BGRIX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000165211
<CLASS-CONTRACT-NAME>R6 Shares
<CLASS-CONTRACT-TICKER-SYMBOL>BGRUX
</CLASS-CONTRACT>
</SERIES>
<SERIES>
<OWNER-CIK>0000810902
<SERIES-ID>S000000584
<SERIES-NAME>BARON SMALL CAP FUND
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000001637
<CLASS-CONTRACT-NAME>BARON SMALL CAP FUND
<CLASS-CONTRACT-TICKER-SYMBOL>BSCFX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000077820
<CLASS-CONTRACT-NAME>Institutional Shares
<CLASS-CONTRACT-TICKER-SYMBOL>BSFIX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000165212
<CLASS-CONTRACT-NAME>R6 Shares
<CLASS-CONTRACT-TICKER-SYMBOL>BSCUX
</CLASS-CONTRACT>
</SERIES>
<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>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000174753
<CLASS-CONTRACT-NAME>R6 Shares
<CLASS-CONTRACT-TICKER-SYMBOL>BIOUX
</CLASS-CONTRACT>
</SERIES>
<SERIES>
<OWNER-CIK>0000810902
<SERIES-ID>S000000586
<SERIES-NAME>BARON FIFTH AVENUE GROWTH FUND
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000001639
<CLASS-CONTRACT-NAME>BARON FIFTH AVENUE GROWTH FUND
<CLASS-CONTRACT-TICKER-SYMBOL>BFTHX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000077822
<CLASS-CONTRACT-NAME>Institutional Shares
<CLASS-CONTRACT-TICKER-SYMBOL>BFTIX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000165213
<CLASS-CONTRACT-NAME>R6 Shares
<CLASS-CONTRACT-TICKER-SYMBOL>BFTUX
</CLASS-CONTRACT>
</SERIES>
<SERIES>
<OWNER-CIK>0000810902
<SERIES-ID>S000042178
<SERIES-NAME>BARON DISCOVERY FUND
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000130959
<CLASS-CONTRACT-NAME>BARON DISCOVERY FUND
<CLASS-CONTRACT-TICKER-SYMBOL>BDFFX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000130960
<CLASS-CONTRACT-NAME>Institutional Shares
<CLASS-CONTRACT-TICKER-SYMBOL>BDFIX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000174754
<CLASS-CONTRACT-NAME>R6 Shares
<CLASS-CONTRACT-TICKER-SYMBOL>BDFUX
</CLASS-CONTRACT>
</SERIES>
<SERIES>
<OWNER-CIK>0000810902
<SERIES-ID>S000060168
<SERIES-NAME>Baron Durable Advantage Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000196921
<CLASS-CONTRACT-NAME>Baron Durable Advantage Fund
<CLASS-CONTRACT-TICKER-SYMBOL>BDAFX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000196922
<CLASS-CONTRACT-NAME>Institutional Shares
<CLASS-CONTRACT-TICKER-SYMBOL>BDAIX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000196923
<CLASS-CONTRACT-NAME>R6 Shares
<CLASS-CONTRACT-TICKER-SYMBOL>BDAUX
</CLASS-CONTRACT>
</SERIES>
</EXISTING-SERIES-AND-CLASSES-CONTRACTS>
</SERIES-AND-CLASSES-CONTRACTS-DATA>
</SEC-HEADER>
<DOCUMENT>
<TYPE>497
<SEQUENCE>1
<FILENAME>d662674d497.htm
<DESCRIPTION>BARON INVESTMENT FUNDS TRUST
<TEXT>
Document 1 - file: d662674d497.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>g662674g04p98.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: g662674g04p98.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>g662674g08r73.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: g662674g08r73.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>4
<FILENAME>g662674g10z35.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 4 - file: g662674g10z35.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>5
<FILENAME>g662674g18x17.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 5 - file: g662674g18x17.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>6
<FILENAME>g662674g29g93.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 6 - file: g662674g29g93.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>7
<FILENAME>g662674g43u15.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 7 - file: g662674g43u15.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>g662674g55o83.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: g662674g55o83.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>g662674g55w27.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 9 - file: g662674g55w27.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>10
<FILENAME>g662674g64n58.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 10 - file: g662674g64n58.jpg

</DOCUMENT>
</SEC-DOCUMENT>