    <SEC-DOCUMENT>0001193125-23-116501-index.html : 20230426
    <SEC-HEADER>0001193125-23-116501.hdr.sgml : 20230426
    <ACCEPTANCE-DATETIME>20230426061758
    ACCESSION NUMBER:		0001193125-23-116501
    CONFORMED SUBMISSION TYPE:	DEFA14A
    PUBLIC DOCUMENT COUNT:		3
    FILED AS OF DATE:		20230426
    DATE AS OF CHANGE:		20230426

    FILER:

    	COMPANY DATA:
    		COMPANY CONFORMED NAME:			MP Materials Corp. / DE
    		CENTRAL INDEX KEY:			0001801368
    		STANDARD INDUSTRIAL CLASSIFICATION:	METAL MINING [1000]
    		IRS NUMBER:				844465489
    		STATE OF INCORPORATION:			DE
    		FISCAL YEAR END:			1231

    	FILING VALUES:
    		FORM TYPE:		DEFA14A
    		SEC ACT:		1934 Act
    		SEC FILE NUMBER:	001-39277
    		FILM NUMBER:		23846681

    	BUSINESS ADDRESS:
    		STREET 1:		1700 S. PAVILION CENTER DR.
    		STREET 2:		SUITE 800
    		CITY:			LAS VEGAS
    		STATE:			NV
    		ZIP:			89135
    		BUSINESS PHONE:		(702) 844-6111

    	MAIL ADDRESS:
    		STREET 1:		1700 S. PAVILION CENTER DR.
    		STREET 2:		SUITE 800
    		CITY:			LAS VEGAS
    		STATE:			NV
    		ZIP:			89135

    	FORMER COMPANY:
    		FORMER CONFORMED NAME:	Fortress Value Acquisition Corp.
    		DATE OF NAME CHANGE:	20200128
    </SEC-HEADER>
    <DOCUMENT>
    <TYPE>DEFA14A
    <SEQUENCE>1
    <FILENAME>d687843ddefa14a.htm
    <DESCRIPTION>DEFA14A
    <TEXT>
    Document 1 - file: d687843ddefa14a.htm

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>2
    <FILENAME>g687843g02a10.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 2 - file: g687843g02a10.jpg

    </DOCUMENT>
    <DOCUMENT>
    <TYPE>GRAPHIC
    <SEQUENCE>3
    <FILENAME>g687843g03a10.jpg
    <DESCRIPTION>GRAPHIC
    <TEXT>
    Document 3 - file: g687843g03a10.jpg

    </DOCUMENT>
    </SEC-DOCUMENT>