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These RSUs vest on the earlier of: (i) June 15, 2027; and (ii) the next annual meeting of the Issuer's stockholders, subject to the reporting person's continued service through the applicable vesting date, and settled upon the earlier to occur of (x) June 15th following the fifth anniversary of the vesting date; (y) a \"change in control event\" within the meaning of Section 409A of the Internal Revenue Code; and (z) the date of the director's separation from service. These RSUs fully vest upon a change in control of the Issuer or the director's termination of service due to death or disability."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of MP Materials Corp. (\"Issuer\") Class A common stock. These RSUs vest on the earlier of: (i) June 15, 2027; and (ii) the next annual meeting of the Issuer's stockholders, subject to the reporting person's continued service through the applicable vesting date, and settled upon the earlier to occur of (x) June 15th following the fifth anniversary of the vesting date; (y) a \"change in control event\" within the meaning of Section 409A of the Internal Revenue Code; and (z) the date of the director's separation from service. These RSUs fully vest upon a change in control of the Issuer or the director's termination of service due to death or disability."}],"balance_after":3038,"derivative":{"underlying":"Common Stock","underlying_shares":3038},"source":{"system":"sec-edgar","filing":"0001801368-26-000039","document":"wk-form4_1781138053.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000180136826000039/wk-form4_1781138053.xml","form_type":"4"}},{"id":743703,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":10771,"kind":"person","name":"DONALD ARNOLD W","position":1,"cik":"0001083206","reported_name":"DONALD ARNOLD W","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Restricted Stock Units","published_at":"2026-06-11T00:32:21.000Z","date":"2026-06-09","kind":"grant","planned":false,"acquired":true,"shares":3038,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of MP Materials Corp. (\"Issuer\") common stock. These RSUs vest on the earlier of: (i) June 15, 2027; and (ii) the next annual meeting of the Issuer's stockholders, subject to the reporting person's continued service through the applicable vesting date, and settled upon the earlier to occur of (x) June 15th following the fifth anniversary of the vesting date; (y) a \"change in control event\" within the meaning of Section 409A of the Internal Revenue Code; and (z) the date of the director's separation from service. These RSUs fully vest upon a change in control of the Issuer or the director's termination of service due to death or disability."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of MP Materials Corp. (\"Issuer\") common stock. These RSUs vest on the earlier of: (i) June 15, 2027; and (ii) the next annual meeting of the Issuer's stockholders, subject to the reporting person's continued service through the applicable vesting date, and settled upon the earlier to occur of (x) June 15th following the fifth anniversary of the vesting date; (y) a \"change in control event\" within the meaning of Section 409A of the Internal Revenue Code; and (z) the date of the director's separation from service. These RSUs fully vest upon a change in control of the Issuer or the director's termination of service due to death or disability."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of MP Materials Corp. (\"Issuer\") common stock. These RSUs vest on the earlier of: (i) June 15, 2027; and (ii) the next annual meeting of the Issuer's stockholders, subject to the reporting person's continued service through the applicable vesting date, and settled upon the earlier to occur of (x) June 15th following the fifth anniversary of the vesting date; (y) a \"change in control event\" within the meaning of Section 409A of the Internal Revenue Code; and (z) the date of the director's separation from service. These RSUs fully vest upon a change in control of the Issuer or the director's termination of service due to death or disability."}],"balance_after":3038,"derivative":{"underlying":"Common Stock","underlying_shares":3038},"source":{"system":"sec-edgar","filing":"0001801368-26-000038","document":"wk-form4_1781137938.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1083206/000180136826000038/wk-form4_1781137938.xml","form_type":"4"}},{"id":743286,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":34494,"kind":"person","name":"DUCKWORTH CONNIE K","position":1,"cik":"0001180940","reported_name":"DUCKWORTH CONNIE K","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Restricted Stock Units","published_at":"2026-06-11T00:31:37.000Z","date":"2026-06-09","kind":"grant","planned":false,"acquired":true,"shares":3038,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"derivative.exercise_price","element":"conversionOrExercisePrice","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of MP Materials Corp. (\"Issuer\") Class A common stock. These RSUs vest on the earlier of: (i) June 15, 2027; and (ii) the next annual meeting of the Issuer's stockholders, subject to the reporting person's continued service through the applicable vesting date, and settled upon the earlier to occur of (x) June 15th following the fifth anniversary of the vesting date; (y) a \"change in control event\" within the meaning of Section 409A of the Internal Revenue Code; and (z) the date of the director's separation from service. These RSUs fully vest upon a change in control of the Issuer or the director's termination of service due to death or disability."},{"field":"derivative.exercise_date","element":"exerciseDate","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of MP Materials Corp. (\"Issuer\") Class A common stock. These RSUs vest on the earlier of: (i) June 15, 2027; and (ii) the next annual meeting of the Issuer's stockholders, subject to the reporting person's continued service through the applicable vesting date, and settled upon the earlier to occur of (x) June 15th following the fifth anniversary of the vesting date; (y) a \"change in control event\" within the meaning of Section 409A of the Internal Revenue Code; and (z) the date of the director's separation from service. These RSUs fully vest upon a change in control of the Issuer or the director's termination of service due to death or disability."},{"field":"derivative.expiration_date","element":"expirationDate","label":"F1","text":"Each restricted stock unit (\"RSU\") represents a contingent right to receive one share of MP Materials Corp. (\"Issuer\") Class A common stock. These RSUs vest on the earlier of: (i) June 15, 2027; and (ii) the next annual meeting of the Issuer's stockholders, subject to the reporting person's continued service through the applicable vesting date, and settled upon the earlier to occur of (x) June 15th following the fifth anniversary of the vesting date; (y) a \"change in control event\" within the meaning of Section 409A of the Internal Revenue Code; and (z) the date of the director's separation from service. These RSUs fully vest upon a change in control of the Issuer or the director's termination of service due to death or disability."}],"balance_after":3038,"derivative":{"underlying":"Common Stock","underlying_shares":3038},"source":{"system":"sec-edgar","filing":"0001801368-26-000037","document":"wk-form4_1781137894.xml","document_sequence":1,"table":"derivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1180940/000180136826000037/wk-form4_1781137894.xml","form_type":"4"}},{"id":743238,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":39685,"kind":"person","name":"Rosenthal Michael Stuart","position":1,"cik":"0001832050","reported_name":"Rosenthal Michael Stuart","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Common Stock","published_at":"2026-06-10T13:01:46.000Z","date":"2026-06-09","kind":"purchase","planned":false,"acquired":true,"shares":10000,"price":54.3,"value":543000.0,"ownership":{"direct":false,"nature":"By Rosenthal Family Trust"},"balance_after":136622,"source":{"system":"sec-edgar","filing":"0001832050-26-000007","document":"wk-form4_1781096503.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000183205026000007/wk-form4_1781096503.xml","form_type":"4"}},{"id":748111,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":40961,"kind":"person","name":"Litinsky James H.","position":1,"cik":"0001831746","reported_name":"Litinsky James H.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Common Stock","published_at":"2026-06-06T00:05:28.000Z","date":"2026-06-03","kind":"sale","planned":false,"acquired":false,"shares":136141,"price":68.65,"value":9346079.65,"ownership":{"direct":false,"nature":"Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $68.27 to $69.25. 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"James Litinsky as sole trustee of the James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011."}],"balance_after":11620798,"source":{"system":"sec-edgar","filing":"0001831746-26-000018","document":"wk-form4_1780704325.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000183174626000018/wk-form4_1780704325.xml","form_type":"4"}},{"id":748110,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":40961,"kind":"person","name":"Litinsky James H.","position":1,"cik":"0001831746","reported_name":"Litinsky James H.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Common Stock","published_at":"2026-06-06T00:05:28.000Z","date":"2026-06-03","kind":"sale","planned":false,"acquired":false,"shares":37286,"price":70.23,"value":2618595.78,"ownership":{"direct":false,"nature":"Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $70.00 to $70.98. 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"James Litinsky as sole trustee of the James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011."}],"balance_after":11756939,"source":{"system":"sec-edgar","filing":"0001831746-26-000018","document":"wk-form4_1780704325.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000183174626000018/wk-form4_1780704325.xml","form_type":"4"}},{"id":748109,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":40961,"kind":"person","name":"Litinsky James H.","position":1,"cik":"0001831746","reported_name":"Litinsky James H.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Common Stock","published_at":"2026-06-06T00:05:28.000Z","date":"2026-06-03","kind":"sale","planned":false,"acquired":false,"shares":11740,"price":71.31,"value":837179.4,"ownership":{"direct":false,"nature":"Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $71.00 to $71.81. 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 (1) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"James Litinsky as sole trustee of the James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011."}],"balance_after":11794225,"source":{"system":"sec-edgar","filing":"0001831746-26-000018","document":"wk-form4_1780704325.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000183174626000018/wk-form4_1780704325.xml","form_type":"4"}},{"id":758801,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":40961,"kind":"person","name":"Litinsky James H.","position":1,"cik":"0001831746","reported_name":"Litinsky James H.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Common Stock","published_at":"2026-05-30T00:59:59.000Z","date":"2026-05-29","kind":"sale","planned":false,"acquired":false,"shares":48050,"price":64.56,"value":3102108.0,"ownership":{"direct":false,"nature":"Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F10","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $64.09 to $65.09. 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 (10) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"James Litinsky as sole trustee of the James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011."}],"balance_after":11805965,"source":{"system":"sec-edgar","filing":"0001831746-26-000016","document":"wk-form4_1780102796.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":9,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000183174626000016/wk-form4_1780102796.xml","form_type":"4"}},{"id":758800,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":40961,"kind":"person","name":"Litinsky James H.","position":1,"cik":"0001831746","reported_name":"Litinsky James H.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Common Stock","published_at":"2026-05-30T00:59:59.000Z","date":"2026-05-29","kind":"sale","planned":false,"acquired":false,"shares":1950,"price":65.13,"value":127003.5,"ownership":{"direct":false,"nature":"Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F9","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $65.10 to $65.23. 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 (9) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"James Litinsky as sole trustee of the James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011."}],"balance_after":11854015,"source":{"system":"sec-edgar","filing":"0001831746-26-000016","document":"wk-form4_1780102796.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":8,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000183174626000016/wk-form4_1780102796.xml","form_type":"4"}},{"id":758799,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":40961,"kind":"person","name":"Litinsky James H.","position":1,"cik":"0001831746","reported_name":"Litinsky James H.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Common Stock","published_at":"2026-05-30T00:59:59.000Z","date":"2026-05-28","kind":"sale","planned":false,"acquired":false,"shares":95114,"price":64.67,"value":6151022.38,"ownership":{"direct":false,"nature":"Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F8","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $64.13 to $65.12. 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 (8) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"James Litinsky as sole trustee of the James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011."}],"balance_after":11855965,"source":{"system":"sec-edgar","filing":"0001831746-26-000016","document":"wk-form4_1780102796.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":7,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000183174626000016/wk-form4_1780102796.xml","form_type":"4"}},{"id":758798,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":40961,"kind":"person","name":"Litinsky James H.","position":1,"cik":"0001831746","reported_name":"Litinsky James H.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Common Stock","published_at":"2026-05-30T00:59:59.000Z","date":"2026-05-28","kind":"sale","planned":false,"acquired":false,"shares":44117,"price":65.65,"value":2896281.05,"ownership":{"direct":false,"nature":"Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F7","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $65.14 to $66.12. 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 (7) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"James Litinsky as sole trustee of the James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011."}],"balance_after":11951079,"source":{"system":"sec-edgar","filing":"0001831746-26-000016","document":"wk-form4_1780102796.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":6,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000183174626000016/wk-form4_1780102796.xml","form_type":"4"}},{"id":758797,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":40961,"kind":"person","name":"Litinsky James H.","position":1,"cik":"0001831746","reported_name":"Litinsky James H.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Common Stock","published_at":"2026-05-30T00:59:59.000Z","date":"2026-05-28","kind":"sale","planned":false,"acquired":false,"shares":49265,"price":66.52,"value":3277107.8,"ownership":{"direct":false,"nature":"Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F6","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $66.13 to $67.12. 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 (6) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"James Litinsky as sole trustee of the James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011."}],"balance_after":11995196,"source":{"system":"sec-edgar","filing":"0001831746-26-000016","document":"wk-form4_1780102796.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":5,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000183174626000016/wk-form4_1780102796.xml","form_type":"4"}},{"id":758796,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":40961,"kind":"person","name":"Litinsky James H.","position":1,"cik":"0001831746","reported_name":"Litinsky James H.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Common Stock","published_at":"2026-05-30T00:59:59.000Z","date":"2026-05-28","kind":"sale","planned":false,"acquired":false,"shares":39445,"price":67.78,"value":2673582.1,"ownership":{"direct":false,"nature":"Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F5","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $67.13 to $68.12. 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 (5) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"James Litinsky as sole trustee of the James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011."}],"balance_after":12044461,"source":{"system":"sec-edgar","filing":"0001831746-26-000016","document":"wk-form4_1780102796.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":4,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000183174626000016/wk-form4_1780102796.xml","form_type":"4"}},{"id":758795,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":40961,"kind":"person","name":"Litinsky James H.","position":1,"cik":"0001831746","reported_name":"Litinsky James H.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Common Stock","published_at":"2026-05-30T00:59:59.000Z","date":"2026-05-28","kind":"sale","planned":false,"acquired":false,"shares":6710,"price":68.18,"value":457487.8,"ownership":{"direct":false,"nature":"Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $68.13 to $68.29. 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"James Litinsky as sole trustee of the James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011."}],"balance_after":12083906,"source":{"system":"sec-edgar","filing":"0001831746-26-000016","document":"wk-form4_1780102796.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000183174626000016/wk-form4_1780102796.xml","form_type":"4"}},{"id":758794,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":40961,"kind":"person","name":"Litinsky James H.","position":1,"cik":"0001831746","reported_name":"Litinsky James H.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Common Stock","published_at":"2026-05-30T00:59:59.000Z","date":"2026-05-27","kind":"sale","planned":false,"acquired":false,"shares":92236,"price":65.2,"value":6013787.2,"ownership":{"direct":false,"nature":"Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $65.00 to $65.80. 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These shares were sold in multiple transactions at prices ranging from $66.00 to $66.19. 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These shares were sold in multiple transactions at prices ranging from $65.10 to $65.60. 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These shares were sold in multiple transactions at prices ranging from $65.50 to $65.94. 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"James Litinsky as sole trustee of the James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011."}],"balance_after":12383153,"source":{"system":"sec-edgar","filing":"0001831746-26-000014","document":"wk-form4_1778802792.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000183174626000014/wk-form4_1778802792.xml","form_type":"4"}},{"id":779341,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":40961,"kind":"person","name":"Litinsky James H.","position":1,"cik":"0001831746","reported_name":"Litinsky James H.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Common Stock","published_at":"2026-05-14T23:53:14.000Z","date":"2026-05-12","kind":"sale","planned":false,"acquired":false,"shares":19844,"price":67.12,"value":1331929.28,"ownership":{"direct":false,"nature":"Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011"},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $67.00 to $67.46. 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 (1) to this Form 4."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F2","text":"James Litinsky as sole trustee of the James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011."}],"balance_after":12486121,"source":{"system":"sec-edgar","filing":"0001831746-26-000014","document":"wk-form4_1778802792.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000183174626000014/wk-form4_1778802792.xml","form_type":"4"}},{"id":786990,"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":"2026-05-09T01:24:35.000Z","date":"2026-05-08","kind":"sale","planned":true,"acquired":false,"shares":6958,"price":75,"value":521850.0,"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 November 20, 2025."}],"balance_after":54095,"source":{"system":"sec-edgar","filing":"0001862894-26-000009","document":"wk-form4_1778289873.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1862894/000186289426000009/wk-form4_1778289873.xml","form_type":"4"}},{"id":787769,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":48924,"kind":"person","name":"Corbett Ryan","position":1,"cik":"0001831686","reported_name":"Corbett Ryan","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Common Stock","published_at":"2026-05-09T01:21:47.000Z","date":"2026-05-08","kind":"sale","planned":true,"acquired":false,"shares":20000,"price":75,"value":1500000.0,"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 December 16, 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 $75.00 to $75.09. 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":109017,"source":{"system":"sec-edgar","filing":"0001831686-26-000007","document":"wk-form4_1778289704.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1831686/000183168626000007/wk-form4_1778289704.xml","form_type":"4"}},{"id":804524,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":40961,"kind":"person","name":"Litinsky James H.","position":1,"cik":"0001831746","reported_name":"Litinsky James H.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Common Stock","published_at":"2026-04-21T01:19:02.000Z","date":"2026-04-20","kind":"sale","planned":true,"acquired":false,"shares":259179,"price":64.03,"value":16595231.37,"ownership":{"direct":false,"nature":"Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011"},"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 September 16, 2025."},{"field":"price","element":"transactionPricePerShare","label":"F4","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $64.00 to $64.24. 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"James Litinsky as sole trustee of the James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011."}],"balance_after":12505965,"source":{"system":"sec-edgar","filing":"0001831746-26-000012","document":"wk-form4_1776734339.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000183174626000012/wk-form4_1776734339.xml","form_type":"4"}},{"id":804523,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":40961,"kind":"person","name":"Litinsky James H.","position":1,"cik":"0001831746","reported_name":"Litinsky James H.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Common Stock","published_at":"2026-04-21T01:19:02.000Z","date":"2026-04-17","kind":"sale","planned":true,"acquired":false,"shares":40821,"price":64.05,"value":2614585.05,"ownership":{"direct":false,"nature":"Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011"},"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 September 16, 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 $64.00 to $64.28. 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."},{"field":"ownership.nature","element":"natureOfOwnership","label":"F3","text":"James Litinsky as sole trustee of the James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011."}],"balance_after":12765144,"source":{"system":"sec-edgar","filing":"0001831746-26-000012","document":"wk-form4_1776734339.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000183174626000012/wk-form4_1776734339.xml","form_type":"4"}},{"id":822945,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":54680,"kind":"person","name":"Infuso David Gregory","position":1,"cik":"0002059140","reported_name":"Infuso David Gregory","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Common Stock","published_at":"2026-04-02T01:24:04.000Z","date":"2026-04-01","kind":"tax_withholding","planned":false,"acquired":false,"shares":804,"price":48.41,"value":38921.64,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on April 1, 2026."}],"balance_after":48442,"source":{"system":"sec-edgar","filing":"0002059140-26-000007","document":"wk-form4_1775093042.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000205914026000007/wk-form4_1775093042.xml","form_type":"4"}},{"id":822993,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":34494,"kind":"person","name":"DUCKWORTH CONNIE K","position":1,"cik":"0001180940","reported_name":"DUCKWORTH CONNIE K","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2026-04-02T01:22:35.000Z","date":"2026-03-31","kind":"grant","planned":false,"acquired":true,"shares":725,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents deferred stock units (\"DSUs\") awarded in connection with the election to defer cash retainers by the reporting person. Each DSU represents a right to receive a share of the registrant's common stock and are fully vested on grant. The DSUs will be settled upon the earlier to occur of the following: (i) June 15th occurring following the close of the fifth calendar year following the close of the calendar year in which the cash retainers are earned; (ii) certain changes in control of the registrant; and (iii) the date of the reporting person's separation from service."}],"balance_after":37152,"source":{"system":"sec-edgar","filing":"0001801368-26-000011","document":"wk-form4_1775092952.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1180940/000180136826000011/wk-form4_1775092952.xml","form_type":"4"}},{"id":838281,"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":"2026-03-18T00:20:39.000Z","date":"2026-03-16","kind":"sale","planned":true,"acquired":false,"shares":13914,"price":60.01,"value":834979.14,"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 November 20, 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 $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":840011,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":48924,"kind":"person","name":"Corbett Ryan","position":1,"cik":"0001831686","reported_name":"Corbett Ryan","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Common Stock","published_at":"2026-03-18T00:18:58.000Z","date":"2026-03-17","kind":"sale","planned":true,"acquired":false,"shares":46000,"price":60,"value":2760000.0,"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 December 16, 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 $60.00 to $60.06. 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":129017,"source":{"system":"sec-edgar","filing":"0001831686-26-000005","document":"wk-form4_1773793135.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1831686/000183168626000005/wk-form4_1773793135.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. 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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":13410385,"source":{"system":"sec-edgar","filing":"0001831746-25-000014","document":"wk-form4_1763692820.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000183174625000014/wk-form4_1763692820.xml","form_type":"4"}},{"id":992573,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":40961,"kind":"person","name":"Litinsky James H.","position":1,"cik":"0001831746","reported_name":"Litinsky James H.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Common Stock","published_at":"2025-11-21T02:40:23.000Z","date":"2025-11-18","kind":"tax_withholding","planned":false,"acquired":false,"shares":78700,"price":58.51,"value":4604737.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents shares withheld to satisfy tax withholding obligation applicable to the vesting of 200,000 shares of restricted stock units that vested on November 18, 2025."}],"balance_after":333644,"source":{"system":"sec-edgar","filing":"0001831746-25-000014","document":"wk-form4_1763692820.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000183174625000014/wk-form4_1763692820.xml","form_type":"4"}},{"id":994688,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":48924,"kind":"person","name":"Corbett Ryan","position":1,"cik":"0001831686","reported_name":"Corbett Ryan","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Financial Officer"}}],"security":"Common Stock","published_at":"2025-11-20T02:21:23.000Z","date":"2025-11-17","kind":"sale","planned":true,"acquired":false,"shares":20000,"price":57.72,"value":1154400.0,"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 August 11, 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 $57.31 to $58.31. 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":194812,"source":{"system":"sec-edgar","filing":"0001831686-25-000005","document":"wk-form4_1763605280.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1831686/000183168625000005/wk-form4_1763605280.xml","form_type":"4"}},{"id":1019321,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":54680,"kind":"person","name":"Infuso David Gregory","position":1,"cik":"0002059140","reported_name":"Infuso David Gregory","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Accounting Officer"}}],"security":"Common Stock","published_at":"2025-10-14T22:35:15.000Z","date":"2025-10-13","kind":"grant","planned":false,"acquired":true,"shares":3427,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"The securities reported are restricted stock units that vest in four annual installments beginning on the first anniversary of the grant date. 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Each DSU represents a right to receive a share of the registrant's common stock and are fully vested on grant. The DSUs will be settled upon the earlier to occur of the following: (i) June 15th occurring following the close of the fifth calendar year following the close of the calendar year in which the cash retainers are earned; (ii) certain changes in control of the registrant; and (iii) the date of the reporting person's separation from service."}],"balance_after":35834,"source":{"system":"sec-edgar","filing":"0001801368-25-000043","document":"wk-form4_1759368458.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1180940/000180136825000043/wk-form4_1759368458.xml","form_type":"4"}},{"id":1029403,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":15165,"kind":"person","name":"Lavan Maryanne","position":1,"cik":"0001495449","reported_name":"Lavan Maryanne","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-10-02T01:27:01.000Z","date":"2025-09-30","kind":"grant","planned":false,"acquired":true,"shares":419,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents deferred stock units (\"DSUs\") awarded in connection with the election to defer cash retainers by the reporting person. Each DSU represents a right to receive a share of the registrant's common stock and are fully vested on grant. The DSUs will be settled upon the earlier to occur of the following: (i) June 15th occurring following the close of the fifth calendar year following the close of the calendar year in which the cash retainers are earned; (ii) certain changes in control of the registrant; and (iii) the date of the reporting person's separation from service."}],"balance_after":19199,"source":{"system":"sec-edgar","filing":"0001495449-25-000006","document":"wk-form4_1759368418.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000149544925000006/wk-form4_1759368418.xml","form_type":"4"}},{"id":1041658,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":40961,"kind":"person","name":"Litinsky James H.","position":1,"cik":"0001831746","reported_name":"Litinsky James H.","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chairman and CEO"}}],"security":"Common Stock","published_at":"2025-09-13T01:28:23.000Z","date":"2025-09-12","kind":"gift","planned":false,"acquired":false,"shares":25000,"price":0,"value":0.0,"ownership":{"direct":false,"nature":"Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011"},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"On September 12, 2025, the reporting person donated 25,000 shares of Common Stock to a donor-advised fund, which will use the gifted shares for charitable purposes."},{"field":"ownership.direct","element":"directOrIndirectOwnership","label":"F2","text":"James Litinsky as sole trustee of the James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011"}],"balance_after":13618076,"source":{"system":"sec-edgar","filing":"0001831746-25-000008","document":"wk-form4_1757726900.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000183174625000008/wk-form4_1757726900.xml","form_type":"4"}},{"id":1052950,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":39685,"kind":"person","name":"Rosenthal Michael Stuart","position":1,"cik":"0001832050","reported_name":"Rosenthal Michael Stuart","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Common Stock","published_at":"2025-08-30T01:23:21.000Z","date":"2025-08-29","kind":"sale","planned":false,"acquired":false,"shares":14063,"price":73.23,"value":1029833.49,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $73.07 to $73.46. 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":1284409,"source":{"system":"sec-edgar","filing":"0001628280-25-041426","document":"wk-form4_1756516997.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":3,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000162828025041426/wk-form4_1756516997.xml","form_type":"4"}},{"id":1052949,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":39685,"kind":"person","name":"Rosenthal Michael Stuart","position":1,"cik":"0001832050","reported_name":"Rosenthal Michael Stuart","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Common Stock","published_at":"2025-08-30T01:23:21.000Z","date":"2025-08-29","kind":"sale","planned":false,"acquired":false,"shares":52063,"price":72.56,"value":3777691.28,"ownership":{"direct":true},"footnotes":[{"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 $72.07 to $73.06. 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":1298472,"source":{"system":"sec-edgar","filing":"0001628280-25-041426","document":"wk-form4_1756516997.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000162828025041426/wk-form4_1756516997.xml","form_type":"4"}},{"id":1052948,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":39685,"kind":"person","name":"Rosenthal Michael Stuart","position":1,"cik":"0001832050","reported_name":"Rosenthal Michael Stuart","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Operating Officer"}}],"security":"Common Stock","published_at":"2025-08-30T01:23:21.000Z","date":"2025-08-29","kind":"sale","planned":false,"acquired":false,"shares":83874,"price":71.48,"value":5995313.52,"ownership":{"direct":true},"footnotes":[{"field":"price","element":"transactionPricePerShare","label":"F1","text":"The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $71.07 to $72.06. 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 (1) to this Form 4."}],"balance_after":1350535,"source":{"system":"sec-edgar","filing":"0001628280-25-041426","document":"wk-form4_1756516997.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000162828025041426/wk-form4_1756516997.xml","form_type":"4"}},{"id":1077679,"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":218,"price":61.62,"value":13433.16,"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":"F4","text":"The price reported in Column 4 is a weighted average price. 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. These shares were sold in multiple transactions at prices ranging from $60.53 to $61.26. 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":218,"source":{"system":"sec-edgar","filing":"0001628280-25-037288","document":"wk-form4_1754097750.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1862894/000162828025037288/wk-form4_1754097750.xml","form_type":"4"}},{"id":1077677,"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":5419,"price":60.22,"value":326332.18,"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. These shares were sold in multiple transactions at prices ranging from $59.54 to $60.51. 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":918,"source":{"system":"sec-edgar","filing":"0001628280-25-037288","document":"wk-form4_1754097750.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1862894/000162828025037288/wk-form4_1754097750.xml","form_type":"4"}},{"id":1092689,"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":2401,"price":31.46,"value":75535.46,"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. 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. These shares were sold in multiple transactions at prices ranging from $31.91 to $32.82. 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 (2) to this Form 4."}],"balance_after":8738,"source":{"system":"sec-edgar","filing":"0001628280-25-034355","document":"wk-form4_1751592431.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1862894/000162828025034355/wk-form4_1751592431.xml","form_type":"4"}},{"id":1099340,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":15165,"kind":"person","name":"Lavan Maryanne","position":1,"cik":"0001495449","reported_name":"Lavan Maryanne","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-07-01T01:19:35.000Z","date":"2025-06-30","kind":"grant","planned":false,"acquired":true,"shares":845,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents deferred stock units (\"DSUs\") awarded in connection with the election to defer cash retainers by the reporting person. Each DSU represents a right to receive a share of the registrant's common stock and are fully vested on grant. The DSUs will be settled upon the earlier to occur of the following: (i) June 15th occurring following the close of the fifth calendar year following the close of the calendar year in which the cash retainers are earned; (ii) certain changes in control of the registrant; and (iii) the date of the reporting person's separation from service."}],"balance_after":18780,"source":{"system":"sec-edgar","filing":"0001628280-25-033585","document":"wk-form4_1751332768.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1801368/000162828025033585/wk-form4_1751332768.xml","form_type":"4"}},{"id":1099370,"issuer":{"id":3549,"kind":"organization","name":"MP Materials Corp. / DE","symbol":"MP"},"owners":[{"id":34494,"kind":"person","name":"DUCKWORTH CONNIE K","position":1,"cik":"0001180940","reported_name":"DUCKWORTH CONNIE K","relationship":{"director":true,"officer":false,"ten_percent_owner":false,"other":false}}],"security":"Common Stock","published_at":"2025-07-01T01:16:44.000Z","date":"2025-06-30","kind":"grant","planned":false,"acquired":true,"shares":901,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"Represents deferred stock units (\"DSUs\") awarded in connection with the election to defer cash retainers by the reporting person. Each DSU represents a right to receive a share of the registrant's common stock and are fully vested on grant. The DSUs will be settled upon the earlier to occur of the following: (i) June 15th occurring following the close of the fifth calendar year following the close of the calendar year in which the cash retainers are earned; (ii) certain changes in control of the registrant; and (iii) the date of the reporting person's separation from service."}],"balance_after":35387,"source":{"system":"sec-edgar","filing":"0001628280-25-033583","document":"wk-form4_1751332598.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1180940/000162828025033583/wk-form4_1751332598.xml","form_type":"4"}},{"id":1100391,"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":"2025-06-28T01:30:22.000Z","date":"2025-06-26","kind":"sale","planned":true,"acquired":false,"shares":5523,"price":36.37,"value":200871.51,"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."}],"balance_after":69749,"source":{"system":"sec-edgar","filing":"0001628280-25-033399","document":"wk-form4_1751074216.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1862894/000162828025033399/wk-form4_1751074216.xml","form_type":"4"}},{"id":1111948,"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":"2025-06-14T01:25:24.000Z","date":"2025-06-13","kind":"sale","planned":true,"acquired":false,"shares":5538,"price":29.96,"value":165918.48,"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. These shares were sold in multiple transactions at prices ranging from $29.95 to $29.99. 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":12675,"source":{"system":"sec-edgar","filing":"0001628280-25-031443","document":"wk-form4_1749864318.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1862894/000162828025031443/wk-form4_1749864318.xml","form_type":"4"}},{"id":1111947,"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":"2025-06-14T01:25:24.000Z","date":"2025-06-12","kind":"sale","planned":true,"acquired":false,"shares":800,"price":29.95,"value":23960.0,"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."}],"balance_after":18213,"source":{"system":"sec-edgar","filing":"0001628280-25-031443","document":"wk-form4_1749864318.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1862894/000162828025031443/wk-form4_1749864318.xml","form_type":"4"}}],"next_cursor":"2025-06-14T01:25:24.000000Z,1111947"}