<SEC-DOCUMENT>0001752724-23-163774-index.html : 20230726
<SEC-HEADER>0001752724-23-163774.hdr.sgml : 20230726
<ACCEPTANCE-DATETIME>20230726130226
ACCESSION NUMBER:		0001752724-23-163774
CONFORMED SUBMISSION TYPE:	NPORT-P
PUBLIC DOCUMENT COUNT:		1
CONFORMED PERIOD OF REPORT:	20230531
FILED AS OF DATE:		20230726
DATE AS OF CHANGE:		20230726
PERIOD START:           	20230531

FILER:

	COMPANY DATA:	
		COMPANY CONFORMED NAME:			MainStay MacKay DefinedTerm Municipal Opportunities Fund
		CENTRAL INDEX KEY:			0001518557
		IRS NUMBER:				000000000
		STATE OF INCORPORATION:			DE
		FISCAL YEAR END:			0531

	FILING VALUES:
		FORM TYPE:		NPORT-P
		SEC ACT:		1940 Act
		SEC FILE NUMBER:	811-22551
		FILM NUMBER:		231111814

	BUSINESS ADDRESS:	
		STREET 1:		51 MADISON AVENUE
		CITY:			NEW YORK
		STATE:			NY
		ZIP:			10010
		BUSINESS PHONE:		212-576-7000

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

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MainStay DefinedTerm Municipal Opportunities Fund
		DATE OF NAME CHANGE:	20120417

	FORMER COMPANY:	
		FORMER CONFORMED NAME:	MainStay DefinedTerm Municipal High Income Fund
		DATE OF NAME CHANGE:	20110419
</SEC-HEADER>
<DOCUMENT>
<TYPE>NPORT-P
<SEQUENCE>1
<FILENAME>primary_doc.xml
<TEXT>
Document 1 - file: primary_doc.html

Document 1 - RAW XML: primary_doc.xml

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