    <SEC-DOCUMENT>0001047469-19-005860-index.html : 20191023
    <SEC-HEADER>0001047469-19-005860.hdr.sgml : 20191023
    <ACCEPTANCE-DATETIME>20191023164739
    ACCESSION NUMBER:		0001047469-19-005860
    CONFORMED SUBMISSION TYPE:	497
    PUBLIC DOCUMENT COUNT:		3
    FILED AS OF DATE:		20191023
    DATE AS OF CHANGE:		20191023
    EFFECTIVENESS DATE:		20191023

    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:		497
    		SEC ACT:		1933 Act
    		SEC FILE NUMBER:	333-230326
    		FILM NUMBER:		191164239

    	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>497
    <SEQUENCE>1
    <FILENAME>a2239922z497.htm
    <DESCRIPTION>497
    <TEXT>
    Document 1 - file: a2239922z497.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>g193136.jpg
    <DESCRIPTION>G193136.JPG
    <TEXT>
    Document 2 - file: g193136.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>g474685.jpg
    <DESCRIPTION>G474685.JPG
    <TEXT>
    Document 3 - file: g474685.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>