<SEC-DOCUMENT>0001144204-17-011663-index.html : 20170228
<SEC-HEADER>0001144204-17-011663.hdr.sgml : 20170228
<ACCEPTANCE-DATETIME>20170228152957
ACCESSION NUMBER:		0001144204-17-011663
CONFORMED SUBMISSION TYPE:	497K
PUBLIC DOCUMENT COUNT:		3
FILED AS OF DATE:		20170228
DATE AS OF CHANGE:		20170228
EFFECTIVENESS DATE:		20170228

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MAINSTAY FUNDS
		CENTRAL INDEX KEY:			0000787441
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			MA
		FISCAL YEAR END:			1031

	FILING VALUES:
		FORM TYPE:		497K
		SEC ACT:		1933 Act
		SEC FILE NUMBER:	033-02610
		FILM NUMBER:		17647170

	BUSINESS ADDRESS:	
		STREET 1:		51 MADISON AVE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10010
		BUSINESS PHONE:		2125767000

	MAIL ADDRESS:	
		STREET 1:		51 MADISON AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10010

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MACKAY SHIELDS MAINSTAY SERIES FUND /NY/
		DATE OF NAME CHANGE:	19911126

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MACKAY SHIELDS SERIES FUND
		DATE OF NAME CHANGE:	19860506
<SERIES-AND-CLASSES-CONTRACTS-DATA>
<EXISTING-SERIES-AND-CLASSES-CONTRACTS>
<SERIES>
<OWNER-CIK>0000787441
<SERIES-ID>S000006894
<SERIES-NAME>MainStay Unconstrained Bond Fund
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000018685
<CLASS-CONTRACT-NAME>Class A
<CLASS-CONTRACT-TICKER-SYMBOL>MASAX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000018686
<CLASS-CONTRACT-NAME>Class B
<CLASS-CONTRACT-TICKER-SYMBOL>MASBX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000018687
<CLASS-CONTRACT-NAME>Class C
<CLASS-CONTRACT-TICKER-SYMBOL>MSICX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000018688
<CLASS-CONTRACT-NAME>Class I
<CLASS-CONTRACT-TICKER-SYMBOL>MSDIX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000060790
<CLASS-CONTRACT-NAME>INVESTOR CLASS
<CLASS-CONTRACT-TICKER-SYMBOL>MSYDX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000138226
<CLASS-CONTRACT-NAME>Class R2
<CLASS-CONTRACT-TICKER-SYMBOL>MSIRX
</CLASS-CONTRACT>
<CLASS-CONTRACT>
<CLASS-CONTRACT-ID>C000166834
<CLASS-CONTRACT-NAME>Class R3
<CLASS-CONTRACT-TICKER-SYMBOL>MSDJX
</CLASS-CONTRACT>
</SERIES>
</EXISTING-SERIES-AND-CLASSES-CONTRACTS>
</SERIES-AND-CLASSES-CONTRACTS-DATA>
</SEC-HEADER>
<DOCUMENT>
<TYPE>497K
<SEQUENCE>1
<FILENAME>v460598_497k.htm
<DESCRIPTION>497K
<TEXT>
Document 1 - file: v460598_497k.htm

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>2
<FILENAME>img_247dc231c0a94.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 2 - file: img_247dc231c0a94.jpg

</DOCUMENT>
<DOCUMENT>
<TYPE>GRAPHIC
<SEQUENCE>3
<FILENAME>img_93fddde12a2c4.jpg
<DESCRIPTION>GRAPHIC
<TEXT>
Document 3 - file: img_93fddde12a2c4.jpg

</DOCUMENT>
</SEC-DOCUMENT>