    <SEC-DOCUMENT>0001104659-21-037738-index.html : 20210317
    <SEC-HEADER>0001104659-21-037738.hdr.sgml : 20210317
    <ACCEPTANCE-DATETIME>20210317164512
    ACCESSION NUMBER:		0001104659-21-037738
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		5
    FILED AS OF DATE:		20210317
    DATE AS OF CHANGE:		20210317

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			New Mountain Finance Corp
    		CENTRAL INDEX KEY:			0001496099
    		IRS NUMBER:				272978010
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	814-00832
    		FILM NUMBER:		21751116

    	BUSINESS ADDRESS:
    		STREET 1:		787 SEVENTH AVENUE, 48TH FLOOR
    		CITY:			NEW YORK
    		STATE:			NY
    		ZIP:			10019
    		BUSINESS PHONE:		(212) 720-0300

    	MAIL ADDRESS:
    		STREET 1:		787 SEVENTH AVENUE, 48TH FLOOR
    		CITY:			NEW YORK
    		STATE:			NY
    		ZIP:			10019

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	New Mountain Guardian Corp
    		DATE OF NAME CHANGE:	20100706
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>tm212469d3_defa14a.htm
    <DESCRIPTION>DEFA14A
    <TEXT>
    Document 1 - file: tm212469d3_defa14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>tm212469d3_defa14aimg001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: tm212469d3_defa14aimg001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>tm212469d3_defa14aimg002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: tm212469d3_defa14aimg002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>tm212469d3_defa14aimg003.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: tm212469d3_defa14aimg003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>tm212469d3_defa14aimg004.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: tm212469d3_defa14aimg004.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>