<SEC-DOCUMENT>0001683863-20-002197-index.html : 20200406
<SEC-HEADER>0001683863-20-002197.hdr.sgml : 20200406
<ACCEPTANCE-DATETIME>20200406115715
ACCESSION NUMBER:		0001683863-20-002197
CONFORMED SUBMISSION TYPE:	497
PUBLIC DOCUMENT COUNT:		15
FILED AS OF DATE:		20200406
DATE AS OF CHANGE:		20200406
EFFECTIVENESS DATE:		20200406

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:		20776310

	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>f3180d1.htm
<DESCRIPTION>BARON INVESTMENT FUNDS TRUST
<TEXT>
Document 1 - file: f3180d1.htm
</DOCUMENT> <DOCUMENT> <TYPE>EX-101.INS <SEQUENCE>2 <FILENAME>bift-20200320.xml <DESCRIPTION>XBRL INSTANCE DOCUMENT <TEXT> Document 2 - file: bift-20200320.xml
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</DOCUMENT> <DOCUMENT> <TYPE>EX-101.DEF <SEQUENCE>4 <FILENAME>bift-20200320_def.xml <DESCRIPTION>XBRL TAXONOMY EXTENSION DEFINITION LINKBASE <TEXT> Document 4 - file: bift-20200320_def.xml
</DOCUMENT> <DOCUMENT> <TYPE>EX-101.LAB <SEQUENCE>5 <FILENAME>bift-20200320_lab.xml <DESCRIPTION>XBRL TAXONOMY EXTENSION LABEL LINKBASE <TEXT> Document 5 - file: bift-20200320_lab.xml
</DOCUMENT> <DOCUMENT> <TYPE>EX-101.PRE <SEQUENCE>6 <FILENAME>bift-20200320_pre.xml <DESCRIPTION>XBRL TAXONOMY EXTENSION PRESENTATION LINKBASE <TEXT> Document 6 - file: bift-20200320_pre.xml
</DOCUMENT> <DOCUMENT> <TYPE>XML <SEQUENCE>7 <FILENAME>R4.htm <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 7 - file: R4.htm
</DOCUMENT> <DOCUMENT> <TYPE>XML <SEQUENCE>8 <FILENAME>Show.js <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 8 - file: Show.js
</DOCUMENT> <DOCUMENT> <TYPE>XML <SEQUENCE>9 <FILENAME>report.css <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 9 - file: report.css
</DOCUMENT> <DOCUMENT> <TYPE>XML <SEQUENCE>10 <FILENAME>R1.htm <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 10 - file: R1.htm
</DOCUMENT> <DOCUMENT> <TYPE>EXCEL <SEQUENCE>12 <FILENAME>Financial_Report.xlsx <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 12 - file: Financial_Report.xlsx
</DOCUMENT> <DOCUMENT> <TYPE>ZIP <SEQUENCE>13 <FILENAME>0001683863-20-002197-xbrl.zip <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 13 - file: 0001683863-20-002197-xbrl.zip
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Document 15 - RAW XML: FilingSummary.xml
</DOCUMENT> <DOCUMENT> <TYPE>XML <SEQUENCE>16 <FILENAME>R2.htm <DESCRIPTION>IDEA: XBRL DOCUMENT <TEXT> Document 16 - file: R2.htm
</DOCUMENT> </SEC-DOCUMENT>