    <SEC-DOCUMENT>0001104659-20-076355-index.html : 20200624
    <SEC-HEADER>0001104659-20-076355.hdr.sgml : 20200624
    <ACCEPTANCE-DATETIME>20200624143503
    ACCESSION NUMBER:		0001104659-20-076355
    CONFORMED SUBMISSION TYPE:	8-K
    PUBLIC DOCUMENT COUNT:		9
    CONFORMED PERIOD OF REPORT:	20200624
    ITEM INFORMATION:		Results of Operations and Financial Condition
    ITEM INFORMATION:		Financial Statements and Exhibits
    FILED AS OF DATE:		20200624
    DATE AS OF CHANGE:		20200624

    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:		8-K
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	814-00832
    		FILM NUMBER:		20985155

    	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>8-K
    <SEQUENCE>1
    <FILENAME>tm2023313-1_8k.htm
    <DESCRIPTION>FORM 8-K
    <TEXT>
    Document 1 - file: tm2023313-1_8k.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>EX-99.1
    <SEQUENCE>2
    <FILENAME>tm2023313d1_ex99-1.htm
    <DESCRIPTION>EXHIBIT 99.1
    <TEXT>
    Document 2 - file: tm2023313d1_ex99-1.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>tm2023313d1_ex99-1img001.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: tm2023313d1_ex99-1img001.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>4
    <FILENAME>tm2023313d1_ex99-1img002.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 4 - file: tm2023313d1_ex99-1img002.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>5
    <FILENAME>tm2023313d1_ex99-1img003.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 5 - file: tm2023313d1_ex99-1img003.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>6
    <FILENAME>tm2023313d1_ex99-1img004.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 6 - file: tm2023313d1_ex99-1img004.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>7
    <FILENAME>tm2023313d1_ex99-1img005.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 7 - file: tm2023313d1_ex99-1img005.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>8
    <FILENAME>tm2023313d1_ex99-1img006.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 8 - file: tm2023313d1_ex99-1img006.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>9
    <FILENAME>tm2023313d1_ex99-1img007.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 9 - file: tm2023313d1_ex99-1img007.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>