    <SEC-DOCUMENT>0001047469-19-003435-index.html : 20190603
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    <ACCEPTANCE-DATETIME>20190603170823
    ACCESSION NUMBER:		0001047469-19-003435
    CONFORMED SUBMISSION TYPE:	497
    PUBLIC DOCUMENT COUNT:		9
    FILED AS OF DATE:		20190603
    DATE AS OF CHANGE:		20190603
    EFFECTIVENESS DATE:		20190603

    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:		19874196

    	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>
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    <TYPE>497
    <SEQUENCE>1
    <FILENAME>a2238870z497.htm
    <DESCRIPTION>497
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    Document 1 - file: a2238870z497.htm

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    Document 2 - file: g947385.jpg

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    <DESCRIPTION>G166783.JPG
    <TEXT>
    Document 3 - file: g166783.jpg

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    <SEQUENCE>4
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    <DESCRIPTION>G992790.JPG
    <TEXT>
    Document 4 - file: g992790.jpg

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    <SEQUENCE>5
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    <DESCRIPTION>G161779.JPG
    <TEXT>
    Document 5 - file: g161779.jpg

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    <DESCRIPTION>G631411.JPG
    <TEXT>
    Document 7 - file: g631411.jpg

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    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>g687302.jpg
    <DESCRIPTION>G687302.JPG
    <TEXT>
    Document 8 - file: g687302.jpg

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    <SEQUENCE>9
    <FILENAME>g516644.jpg
    <DESCRIPTION>G516644.JPG
    <TEXT>
    Document 9 - file: g516644.jpg

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