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These shares were sold in multiple transactions at prices ranging from $60.00 to $60.10. The reporting person undertakes to provide to MP Materials Corp., any security holder of MP Materials Corp., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4."}],"balance_after":61053,"source":{"system":"sec-edgar","filing":"0001862894-26-000007","document":"wk-form4_1773793236.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1862894/000186289426000007/wk-form4_1773793236.xml","form_type":"4"}},{"id":933480,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":48760,"kind":"person","name":"Hoops Elliot Dean","position":1,"cik":"0001862894","reported_name":"Hoops Elliot Dean","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"General Counsel and Secretary"}}],"security":"Common Stock","published_at":"2026-01-23T00:48:19.000Z","date":"2026-01-20","kind":"sale","planned":true,"acquired":false,"shares":7823,"price":68.21,"value":533606.83,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $68.00 to $68.55. The reporting person undertakes to provide to MP Materials Corp., any security holder of MP Materials Corp., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4."}],"balance_after":74967,"source":{"system":"sec-edgar","filing":"0001862894-26-000005","document":"wk-form4_1769129297.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1862894/000186289426000005/wk-form4_1769129297.xml","form_type":"4"}},{"id":939292,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":48760,"kind":"person","name":"Hoops Elliot Dean","position":1,"cik":"0001862894","reported_name":"Hoops Elliot Dean","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"General Counsel and 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the number of shares of Common Stock received upon vesting of restricted stock units with performance conditions award previously granted to the reporting person on February 23, 2023. 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These shares were sold in multiple transactions at prices ranging from $61.61 to $61.64. The reporting person undertakes to provide to MP Materials Corp., any security holder of MP Materials Corp., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (4) to this Form 4."}],"balance_after":0,"source":{"system":"sec-edgar","filing":"0001628280-25-037288","document":"wk-form4_1754097750.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1862894/000162828025037288/wk-form4_1754097750.xml","form_type":"4"}},{"id":1077678,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":48760,"kind":"person","name":"Hoops Elliot Dean","position":1,"cik":"0001862894","reported_name":"Hoops Elliot Dean","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"General Counsel and Secretary"}}],"security":"Common Stock","published_at":"2025-08-02T01:22:34.000Z","date":"2025-08-01","kind":"sale","planned":true,"acquired":false,"shares":700,"price":60.77,"value":42539.0,"ownership":{"direct":false,"nature":"By Hoops Family Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. 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These shares were sold in multiple transactions at prices ranging from $59.54 to $60.51. 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These shares were sold in multiple transactions at prices ranging from $31.35 to $31,82. The reporting person undertakes to provide to MP Materials Corp., any security holder of MP Materials Corp., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (3) to this Form 4."}],"balance_after":6337,"source":{"system":"sec-edgar","filing":"0001628280-25-034355","document":"wk-form4_1751592431.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1862894/000162828025034355/wk-form4_1751592431.xml","form_type":"4"}},{"id":1092688,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":48760,"kind":"person","name":"Hoops Elliot Dean","position":1,"cik":"0001862894","reported_name":"Hoops Elliot Dean","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"General Counsel and Secretary"}}],"security":"Common Stock","published_at":"2025-07-04T01:27:17.000Z","date":"2025-07-01","kind":"sale","planned":true,"acquired":false,"shares":3937,"price":32.24,"value":126928.88,"ownership":{"direct":false,"nature":"By Hoops Family Trust"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on February 26, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported in Column 4 is a weighted average price. 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