MP

SEC source: 0001862894-26-000002 · wk-form4_1768437793.xml · nonDerivative · entry 5

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 84,090

F5 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 13, 2026.

SEC source: 0002059140-26-000003 · wk-form4_1768437750.xml · nonDerivative · entry 4

Infuso David Gregory · CIK 0002059140 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,888

F4 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 13, 2026.

SEC source: 0001832050-26-000003 · wk-form4_1768437574.xml · nonDerivative · entry 4

Rosenthal Michael Stuart · CIK 0001832050 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,316,673

F4 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 13, 2026.

SEC source: 0001831746-26-000008 · wk-form4_1768348785.xml · nonDerivative · entry 4

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 251,450

F4 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 12, 2026.

SEC source: 0001831746-26-000008 · wk-form4_1768348785.xml · nonDerivative · entry 3

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 277,766

F3 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units with performance conditions that vested on January 12, 2026.

SEC source: 0001831746-26-000008 · wk-form4_1768348785.xml · nonDerivative · entry 2

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 316,004

F2 · shares: Represents 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. Under the terms of this award, the restricted stock units with performance conditions cliff vest upon the conclusion of the three-year performance period from 01/01/2023 through 12/31/2025 and the certification of the Company's achievement of the pre-established performance conditions based on the relative total shareholder return of the Company's share price compared to the S&P 400 Index and S&P 400 Materials Index.

SEC source: 0001831746-26-000008 · wk-form4_1768348785.xml · nonDerivative · entry 1

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 277,766

F1 · shares: The securities reported are restricted stock units that vest in four annual installments beginning on the first anniversary of the grant date. Each restricted stock unit represents the contingent right to receive, upon vesting of the unit, one share of the issuer's common stock.

SEC source: 0001831686-26-000003 · wk-form4_1768437674.xml · nonDerivative · entry 4

Corbett Ryan · CIK 0001831686 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 184,476

F4 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 12, 2026.

SEC source: 0001831686-26-000003 · wk-form4_1768437674.xml · nonDerivative · entry 3

Corbett Ryan · CIK 0001831686 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 191,791

F3 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units with performance conditions that vested on January 12, 2026.

SEC source: 0001831686-26-000003 · wk-form4_1768437674.xml · nonDerivative · entry 2

Corbett Ryan · CIK 0001831686 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 203,829

F2 · shares: Represents 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. Under the terms of this award, the restricted stock units with performance conditions cliff vest upon the conclusion of the three-year performance period from 01/01/2023 through 12/31/2025 and the certification of the Company's achievement of the pre-established performance conditions based on the relative total shareholder return of the Company's share price compared to the S&P 400 Index and S&P 400 Materials Index.

SEC source: 0001831686-26-000003 · wk-form4_1768437674.xml · nonDerivative · entry 1

Corbett Ryan · CIK 0001831686 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 173,239

F1 · shares: The securities reported are restricted stock units that vest in four annual installments beginning on the first anniversary of the grant date. Each restricted stock unit represents the contingent right to receive, upon vesting of the unit, one share of the issuer's common stock.

SEC source: 0001862894-26-000002 · wk-form4_1768437793.xml · nonDerivative · entry 4

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 87,859

F4 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 12, 2026.

SEC source: 0001862894-26-000002 · wk-form4_1768437793.xml · nonDerivative · entry 3

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 92,385

F3 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units with performance conditions that vested on January 12, 2026.

SEC source: 0001862894-26-000002 · wk-form4_1768437793.xml · nonDerivative · entry 2

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 101,413

F2 · shares: Represents 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. Under the terms of this award, the restricted stock units with performance conditions cliff vest upon the conclusion of the three-year performance period from 01/01/2023 through 12/31/2025 and the certification of the Company's achievement of the pre-established performance conditions based on the relative total shareholder return of the Company's share price compared to the S&P 400 Index and S&P 400 Materials Index.

SEC source: 0001862894-26-000002 · wk-form4_1768437793.xml · nonDerivative · entry 1

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 78,471

F1 · shares: The securities reported are restricted stock units that vest in four annual installments beginning on the first anniversary of the grant date. Each restricted stock unit represents the contingent right to receive, upon vesting of the unit, one share of the issuer's common stock.

SEC source: 0002059140-26-000003 · wk-form4_1768437750.xml · nonDerivative · entry 3

Infuso David Gregory · CIK 0002059140 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 52,708

F3 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 12, 2026.

SEC source: 0002059140-26-000003 · wk-form4_1768437750.xml · nonDerivative · entry 2

Infuso David Gregory · CIK 0002059140 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 53,289

F2 · shares: The securities reported are restricted stock units that vested on the date of grant.

SEC source: 0002059140-26-000003 · wk-form4_1768437750.xml · nonDerivative · entry 1

Infuso David Gregory · CIK 0002059140 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 51,988

F1 · shares: The securities reported are restricted stock units that vest in four annual installments beginning on the first anniversary of the grant date. Each restricted stock unit represents the contingent right to receive, upon vesting of the unit, one share of the issuer's common stock.

SEC source: 0001832050-26-000003 · wk-form4_1768437574.xml · nonDerivative · entry 3

Rosenthal Michael Stuart · CIK 0001832050 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,325,756

F3 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 12, 2026.

SEC source: 0001832050-26-000003 · wk-form4_1768437574.xml · nonDerivative · entry 2

Rosenthal Michael Stuart · CIK 0001832050 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,336,375

F2 · shares: Represents 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. Under the terms of this award, the restricted stock units with performance conditions cliff vest upon the conclusion of the three-year performance period from 01/01/2023 through 12/31/2025 and the certification of the Company's achievement of the pre-established performance conditions based on the relative total shareholder return of the Company's share price compared to the S&P 400 Index and S&P 400 Materials Index.

SEC source: 0001832050-26-000003 · wk-form4_1768437574.xml · nonDerivative · entry 1

Rosenthal Michael Stuart · CIK 0001832050 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,302,727

F1 · shares: The securities reported are restricted stock units that vest in four annual installments beginning on the first anniversary of the grant date. Each restricted stock unit represents the contingent right to receive, upon vesting of the unit, one share of the issuer's common stock.

SEC source: 0001831746-26-000003 · wk-form4_1768011706.xml · nonDerivative · entry 2

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO

10b5-1 filing: Plan reported

Ownership: Indirect · Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011

Disclosed balance after: 12,805,965

F1 · kind: 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.

F4 · price: 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 $64.80. 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.

F3 · ownership.nature: James Litinsky as sole trustee of the James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011.

SEC source: 0001831746-26-000003 · wk-form4_1768011706.xml · nonDerivative · entry 1

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO

10b5-1 filing: Plan reported

Ownership: Indirect · Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011

Disclosed balance after: 13,078,565

F1 · kind: 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.

F2 · price: 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 $64.06. 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.

F3 · ownership.nature: James Litinsky as sole trustee of the James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011.

SEC source: 0001180940-26-000001 · wk-form4_1767407976.xml · nonDerivative · entry 1

DUCKWORTH CONNIE K · CIK 0001180940 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 36,427

F1 · shares: 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.

SEC source: 0001495449-26-000001 · wk-form4_1767407901.xml · nonDerivative · entry 1

Lavan Maryanne · CIK 0001495449 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,755

F1 · shares: 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.

SEC source: 0001831686-25-000009 · wk-form4_1765419110.xml · nonDerivative · entry 1

Corbett Ryan · CIK 0001831686 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 156,666

SEC source: 0001831746-25-000017 · wk-form4_1764989130.xml · nonDerivative · entry 3

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011

Disclosed balance after: 13,105,965

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $63.25 to $63.74. 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.

F2 · ownership.nature: James Litinsky as sole trustee of the James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011.

SEC source: 0001831746-25-000017 · wk-form4_1764989130.xml · nonDerivative · entry 2

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011

Disclosed balance after: 13,180,603

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $63.00 to $63.83. 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.

F2 · ownership.nature: James Litinsky as sole trustee of the James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011.

SEC source: 0001831746-25-000017 · wk-form4_1764989130.xml · nonDerivative · entry 1

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011

Disclosed balance after: 13,215,404

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $62.25 to $63.24. 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 (1) to this Form 4.

F2 · ownership.nature: James Litinsky as sole trustee of the James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011.

SEC source: 0001831746-25-000014 · wk-form4_1763692820.xml · nonDerivative · entry 3

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011

Disclosed balance after: 13,369,665

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $64.27 to $65.03. 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.

SEC source: 0001831746-25-000014 · wk-form4_1763692820.xml · nonDerivative · entry 2

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011

Disclosed balance after: 13,410,385

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $63.27 to $64.25. 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 (2) to this Form 4.

SEC source: 0001831746-25-000014 · wk-form4_1763692820.xml · nonDerivative · entry 1

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 333,644

F1 · shares: 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.

SEC source: 0001831686-25-000005 · wk-form4_1763605280.xml · nonDerivative · entry 1

Corbett Ryan · CIK 0001831686 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 194,812

F1 · kind: 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.

F2 · price: 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.

SEC source: 0002059140-25-000005 · wk-form4_1760481312.xml · nonDerivative · entry 1

Infuso David Gregory · CIK 0002059140 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 48,094

F1 · shares: The securities reported are restricted stock units that vest in four annual installments beginning on the first anniversary of the grant date. Each restricted stock unit represents the contingent right to receive, upon vesting of the unit, one share of the issuer's common stock.

SEC source: 0001801368-25-000043 · wk-form4_1759368458.xml · nonDerivative · entry 1

DUCKWORTH CONNIE K · CIK 0001180940 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,834

F1 · balance_after: 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.

SEC source: 0001495449-25-000006 · wk-form4_1759368418.xml · nonDerivative · entry 1

Lavan Maryanne · CIK 0001495449 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 19,199

F1 · shares: 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.

SEC source: 0001831746-25-000008 · wk-form4_1757726900.xml · nonDerivative · entry 1

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO

10b5-1 filing: No plan indicated

Ownership: Indirect · Held by James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011

Disclosed balance after: 13,618,076

F1 · kind: 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.

F2 · ownership.direct: James Litinsky as sole trustee of the James Henry Litinsky, Trustee of James Henry Litinsky Revocable Trust u/a/d 10/19/2011

SEC source: 0001628280-25-041426 · wk-form4_1756516997.xml · nonDerivative · entry 3

Rosenthal Michael Stuart · CIK 0001832050 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,284,409

F3 · price: 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.

SEC source: 0001628280-25-041426 · wk-form4_1756516997.xml · nonDerivative · entry 2

Rosenthal Michael Stuart · CIK 0001832050 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,298,472

F2 · price: 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.

SEC source: 0001628280-25-041426 · wk-form4_1756516997.xml · nonDerivative · entry 1

Rosenthal Michael Stuart · CIK 0001832050 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,350,535

F1 · price: 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.

SEC source: 0001628280-25-037288 · wk-form4_1754097750.xml · nonDerivative · entry 3

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: Plan reported

Ownership: Indirect · By Hoops Family Trust

Disclosed balance after: 0

F1 · kind: 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.

F4 · price: 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.

SEC source: 0001628280-25-037288 · wk-form4_1754097750.xml · nonDerivative · entry 2

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: Plan reported

Ownership: Indirect · By Hoops Family Trust

Disclosed balance after: 218

F1 · kind: 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.

F3 · price: 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.

SEC source: 0001628280-25-037288 · wk-form4_1754097750.xml · nonDerivative · entry 1

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: Plan reported

Ownership: Indirect · By Hoops Family Trust

Disclosed balance after: 918

F1 · kind: 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.

F2 · price: 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.

SEC source: 0001628280-25-034355 · wk-form4_1751592431.xml · nonDerivative · entry 2

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: Plan reported

Ownership: Indirect · By Hoops Family Trust

Disclosed balance after: 6,337

F1 · kind: 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.

F3 · price: 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.

SEC source: 0001628280-25-034355 · wk-form4_1751592431.xml · nonDerivative · entry 1

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: Plan reported

Ownership: Indirect · By Hoops Family Trust

Disclosed balance after: 8,738

F1 · kind: 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.

F2 · price: 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.

SEC source: 0001628280-25-033583 · wk-form4_1751332598.xml · nonDerivative · entry 1

DUCKWORTH CONNIE K · CIK 0001180940 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 35,387

F1 · shares: 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.

SEC source: 0001628280-25-033585 · wk-form4_1751332768.xml · nonDerivative · entry 1

Lavan Maryanne · CIK 0001495449 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 18,780

F1 · shares: 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.

SEC source: 0001628280-25-033399 · wk-form4_1751074216.xml · nonDerivative · entry 1

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 69,749

F1 · kind: 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.

SEC source: 0001628280-25-031443 · wk-form4_1749864318.xml · nonDerivative · entry 2

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: Plan reported

Ownership: Indirect · By Hoops Family Trust

Disclosed balance after: 12,675

F1 · kind: 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.

F2 · price: 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.

SEC source: 0001628280-25-031443 · wk-form4_1749864318.xml · nonDerivative · entry 1

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: Plan reported

Ownership: Indirect · By Hoops Family Trust

Disclosed balance after: 18,213

F1 · kind: 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.