<SEC-DOCUMENT>0001193125-17-381810-index.html : 20180412
<SEC-HEADER>0001193125-17-381810.hdr.sgml : 20180412

<ACCEPTANCE-DATETIME>20171228173801

<PRIVATE-TO-PUBLIC>

ACCESSION NUMBER:		0001193125-17-381810

CONFORMED SUBMISSION TYPE:	485BPOS

PUBLIC DOCUMENT COUNT:		15

FILED AS OF DATE:		20171229

DATE AS OF CHANGE:		20171228

EFFECTIVENESS DATE:		20171229


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:		485BPOS

		SEC ACT:		1933 Act

		SEC FILE NUMBER:	033-12112

		FILM NUMBER:		171279151



	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




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:		485BPOS

		SEC ACT:		1940 Act

		SEC FILE NUMBER:	811-05032

		FILM NUMBER:		171279152



	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>

<CLASS-CONTRACT>

<CLASS-CONTRACT-ID>C000196922

<CLASS-CONTRACT-NAME>Institutional Shares

</CLASS-CONTRACT>

<CLASS-CONTRACT>

<CLASS-CONTRACT-ID>C000196923

<CLASS-CONTRACT-NAME>R6 Shares

</CLASS-CONTRACT>

</SERIES>

</EXISTING-SERIES-AND-CLASSES-CONTRACTS>

</SERIES-AND-CLASSES-CONTRACTS-DATA>

</SEC-HEADER>

<DOCUMENT>
<TYPE>485BPOS
<SEQUENCE>1
<FILENAME>d463654d485bpos.htm
<DESCRIPTION>BARON INVESTMENT FUNDS TRUST
<TEXT>
Document 1 - file: d463654d485bpos.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99. D7
<SEQUENCE>2
<FILENAME>d463654dex99d7.htm
<DESCRIPTION>INVESTMENT ADVISORY AGREEMENT BETWEEN BARON DURABLE ADVANTAGE FUND AND BAMCO
<TEXT>
Document 2 - file: d463654dex99d7.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99. D9
<SEQUENCE>3
<FILENAME>d463654dex99d9.htm
<DESCRIPTION>AMENDED AND RESTATED SCHEDULE A, DATED NOVEMBER 13, 2017 TO FEE WAIVER AGREEMENT
<TEXT>
Document 3 - file: d463654dex99d9.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.E
<SEQUENCE>4
<FILENAME>d463654dex99e.htm
<DESCRIPTION>DISTRIBUTION AGREEMENT BETWEEN REGISTRANT AND BARON CAPITAL, INC.
<TEXT>
Document 4 - file: d463654dex99e.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.J
<SEQUENCE>5
<FILENAME>d463654dex99j.htm
<DESCRIPTION>CONSENT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM, PRICEWATERHOUSECOOPERS
<TEXT>
Document 5 - file: d463654dex99j.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>EX-99.N
<SEQUENCE>6
<FILENAME>d463654dex99n.htm
<DESCRIPTION>MULTI-CLASS PLAN ADOPTED PURSUANT TO RULE 18F-3.
<TEXT>
Document 6 - file: d463654dex99n.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>8
<FILENAME>g463654g04p98.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 8 - file: g463654g04p98.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>9
<FILENAME>g463654g08r73.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 9 - file: g463654g08r73.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>10
<FILENAME>g463654g10z35.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 10 - file: g463654g10z35.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>11
<FILENAME>g463654g18x17.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 11 - file: g463654g18x17.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>12
<FILENAME>g463654g43u15.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 12 - file: g463654g43u15.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>13
<FILENAME>g463654g55o83.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 13 - file: g463654g55o83.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>14
<FILENAME>g463654g55w27.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 14 - file: g463654g55w27.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>15
<FILENAME>g463654g64n58.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 15 - file: g463654g64n58.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>CORRESP
<SEQUENCE>16
<FILENAME>filename16.htm
<TEXT>
Document 16 - file: filename16.htm

</DOCUMENT>
</SEC-DOCUMENT>