MP

SEC source: 0001628280-25-030844 · wk-form4_1749691293.xml · derivative · entry 1

DONALD ARNOLD W · CIK 0001083206 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,957

Underlying: Common Stock · 4,957 shares

Expires not disclosed

F1 · derivative.exercise_price: 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, 2026; 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.

F1 · derivative.exercise_date: 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, 2026; 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.

F1 · derivative.expiration_date: 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, 2026; 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.

SEC source: 0001628280-25-030835 · wk-form4_1749690417.xml · derivative · entry 1

WEISENBURGER RANDALL J · CIK 0001031609 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,957

Underlying: Common Stock · 4,957 shares

Expires not disclosed

F1 · derivative.exercise_price: 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, 2026; 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.

F1 · derivative.exercise_date: 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, 2026; 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.

F1 · derivative.expiration_date: 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, 2026; 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.

SEC source: 0001628280-25-030851 · wk-form4_1749692879.xml · derivative · entry 1

DUCKWORTH CONNIE K · CIK 0001180940 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,957

Underlying: Common Stock · 4,957 shares

Expires not disclosed

F1 · derivative.exercise_price: 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, 2026; 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.

F1 · derivative.exercise_date: 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, 2026; 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.

F1 · derivative.expiration_date: 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, 2026; 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.

SEC source: 0001628280-25-030842 · wk-form4_1749691096.xml · derivative · entry 1

Lavan Maryanne · CIK 0001495449 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,957

Underlying: Common Stock · 4,957 shares

Expires not disclosed

F1 · derivative.exercise_price: 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, 2026; 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.

F1 · derivative.exercise_date: 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, 2026; 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.

F1 · derivative.expiration_date: 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, 2026; 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.

SEC source: 0001628280-25-030838 · wk-form4_1749690756.xml · derivative · entry 1

McKnight Andrew A. · CIK 0001680357 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,957

Underlying: Common Stock · 4,957 shares

Expires not disclosed

F1 · derivative.exercise_price: 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, 2026; 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.

F1 · derivative.exercise_date: 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, 2026; 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.

F1 · derivative.expiration_date: 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, 2026; 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.

SEC source: 0001628280-25-030840 · wk-form4_1749690898.xml · derivative · entry 1

MYERS RICHARD B · CIK 0001356702 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 4,957

Underlying: Common Stock · 4,957 shares

Expires not disclosed

F1 · derivative.exercise_price: 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, 2026; 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.

F1 · derivative.exercise_date: 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, 2026; 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.

F1 · derivative.expiration_date: 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, 2026; 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.

SEC source: 0001628280-25-026686 · wk-form4_1747702270.xml · nonDerivative · entry 1

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 75,272

F1 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on May 17, 2025.

SEC source: 0001628280-25-018104 · wk-form4_1744852266.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: 13,643,076

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 December 16, 2024.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $27.00 to $27.43. 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.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: 0001628280-25-015746 · wk-form4_1743469894.xml · nonDerivative · entry 1

DUCKWORTH CONNIE K · CIK 0001180940 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 34,486

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: 0001628280-25-015744 · wk-form4_1743469790.xml · nonDerivative · entry 1

Lavan Maryanne · CIK 0001495449 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 17,935

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: 0001628280-25-015315 · wk-form4_1743126035.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: 13,842,256

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 December 16, 2024.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $27.00 to $27.03. 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 (4) to this Form 4.

F3 · 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: 0001628280-25-015315 · wk-form4_1743126035.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: 13,860,775

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 December 16, 2024.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $27.00 to $27.25. 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.

F3 · 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: 0001628280-25-014392 · wk-form4_1742606122.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: 14,257,068

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 December 16, 2024.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $27.00 to $27.24. 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 (2) to this Form 4.

F3 · 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: 0001628280-25-013933 · wk-form4_1742433524.xml · nonDerivative · entry 3

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: 14,352,689

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 December 16, 2024.

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $26.47 to $27.25. 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 (5) to this Form 4.

F3 · 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: 0001628280-25-013933 · wk-form4_1742433524.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: 14,513,864

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 December 16, 2024.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $26.03 to $27.00. 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.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: 0001628280-25-013604 · wk-form4_1742337895.xml · nonDerivative · entry 5

Corbett Ryan · CIK 0001831686 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 214,812

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 13, 2024.

SEC source: 0001628280-25-013933 · wk-form4_1742433524.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: 15,153,158

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 December 16, 2024.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $26.45 to $27.05. 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.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: 0001628280-25-013604 · wk-form4_1742337895.xml · nonDerivative · entry 4

Corbett Ryan · CIK 0001831686 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 229,812

F4 · shares: Represents shares withheld to satisfy tax withholding obligations in connection with the vesting of restricted stock units on March 16, 2025.

SEC source: 0001628280-25-013598 · wk-form4_1742337406.xml · nonDerivative · entry 1

Rosenthal Michael Stuart · CIK 0001832050 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,434,409

F1 · shares: Represents shares withheld to satisfy tax withholding obligations in connection with the vesting of restricted stock units on March 16, 2025.

SEC source: 0001628280-25-013604 · wk-form4_1742337895.xml · nonDerivative · entry 3

Corbett Ryan · CIK 0001831686 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 230,100

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 13, 2024.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $25.87 to $26.56. 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: 0001628280-25-013604 · wk-form4_1742337895.xml · nonDerivative · entry 2

Corbett Ryan · CIK 0001831686 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 250,905

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 13, 2024.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $24.83 to $25.80. 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 (2) to this Form 4.

SEC source: 0001628280-25-013604 · wk-form4_1742337895.xml · nonDerivative · entry 1

Corbett Ryan · CIK 0001831686 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 275,100

F1 · shares: The sales reported in this Form 4 were effected pursuant to a Rule 10b5-1 trading plan adopted by the reporting person on December 13, 2024.

SEC source: 0001628280-25-005867 · wk-form4_1739577558.xml · nonDerivative · entry 2

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: No plan indicated

Ownership: Indirect · By Hoops Family Trust

Disclosed balance after: 19,013

F1 · kind: This transaction involved a gift of shares by the reporting person to the Hoops Family Trust, a living trust, on February 13, 2025. These shares were previously reported as directly beneficially owned by the reporting person.

SEC source: 0001628280-25-005867 · wk-form4_1739577558.xml · nonDerivative · entry 1

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 78,856

F1 · kind: This transaction involved a gift of shares by the reporting person to the Hoops Family Trust, a living trust, on February 13, 2025. These shares were previously reported as directly beneficially owned by the reporting person.

SEC source: 0001628280-25-004324 · wk-form4_1738894377.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: 15,643,076

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, 2024.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.75 to $24.21. 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.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: 0001628280-25-001547 · wk-form4_1736903621.xml · nonDerivative · entry 4

Corbett Ryan · CIK 0001831686 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 290,100

F4 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 14, 2025.

SEC source: 0001628280-25-001545 · wk-form4_1736902935.xml · nonDerivative · entry 4

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 89,755

F4 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 14, 2025.

SEC source: 0001628280-25-001547 · wk-form4_1736903621.xml · nonDerivative · entry 3

Corbett Ryan · CIK 0001831686 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 293,878

F3 · 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: 0001628280-25-001547 · wk-form4_1736903621.xml · nonDerivative · entry 2

Corbett Ryan · CIK 0001831686 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 250,356

F2 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 13, 2025.

SEC source: 0001628280-25-001545 · wk-form4_1736902935.xml · nonDerivative · entry 3

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 91,054

F3 · 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: 0001628280-25-001545 · wk-form4_1736902935.xml · nonDerivative · entry 2

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 65,453

F2 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 13, 2025.

SEC source: 0001628280-25-001551 · wk-form4_1736904556.xml · nonDerivative · entry 3

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 412,344

F3 · 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: 0001628280-25-001551 · wk-form4_1736904556.xml · nonDerivative · entry 2

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 293,297

F2 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 13, 2025.

SEC source: 0001628280-25-001549 · wk-form4_1736904180.xml · nonDerivative · entry 3

Rosenthal Michael Stuart · CIK 0001832050 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,434,793

F3 · 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: 0001628280-25-001549 · wk-form4_1736904180.xml · nonDerivative · entry 2

Rosenthal Michael Stuart · CIK 0001832050 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,387,430

F2 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 13, 2025.

SEC source: 0001628280-25-001547 · wk-form4_1736903621.xml · nonDerivative · entry 1

Corbett Ryan · CIK 0001831686 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 252,149

F1 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 12, 2025.

SEC source: 0001628280-25-001545 · wk-form4_1736902935.xml · nonDerivative · entry 1

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 66,702

F1 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 12, 2025.

SEC source: 0001628280-25-001551 · wk-form4_1736904556.xml · nonDerivative · entry 1

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO · 10% owner

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 298,588

F1 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 12, 2025.

SEC source: 0001628280-25-001549 · wk-form4_1736904180.xml · nonDerivative · entry 1

Rosenthal Michael Stuart · CIK 0001832050 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,389,990

F1 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 12, 2025.

SEC source: 0001628280-25-000111 · wk-form4_1735860339.xml · nonDerivative · entry 1

DUCKWORTH CONNIE K · CIK 0001180940 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 33,257

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: 0001628280-25-000105 · wk-form4_1735858945.xml · nonDerivative · entry 1

Lavan Maryanne · CIK 0001495449 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 16,783

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: 0001832050-24-000004 · wk-form4_1733965952.xml · nonDerivative · entry 1

Rosenthal Michael Stuart · CIK 0001832050 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,400,591

F1 · kind: The Reporting Person acquired the shares reported herein as a limited partner in certain entities in pro rata in-kind distributions by such entities, for no consideration, the acquisition of which was exempt pursuant to Rule 16a-9.

SEC source: 0001831746-24-000009 · wk-form4_1733359048.xml · nonDerivative · entry 3

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO · 10% owner

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: 16,029,299

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, 2024.

F4 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $23.70 to $24.00. 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: 0001831746-24-000009 · wk-form4_1733359048.xml · nonDerivative · entry 2

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO · 10% owner

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: 16,279,682

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, 2024.

F3 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $22.70 to $23.69. 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: 0001831746-24-000009 · wk-form4_1733359048.xml · nonDerivative · entry 1

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO · 10% owner

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: 17,608,409

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, 2024.

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.29 to $21.01. 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: 0001831686-24-000006 · wk-form4_1732924837.xml · nonDerivative · entry 1

Corbett Ryan · CIK 0001831686 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 260,021

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, 2024.

SEC source: 0001831746-24-000006 · wk-form4_1732925479.xml · nonDerivative · entry 2

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO · 10% owner

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: 17,843,076

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.60 to $21.25. 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: 0001831746-24-000006 · wk-form4_1732925479.xml · nonDerivative · entry 1

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO · 10% owner

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: 18,043,076

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $20.00 to $20.55. The reporting person undertakes to provide to MP Materials Corp., any security holder of MP Materials Corp., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (1) to this Form 4.

SEC source: 0001831686-24-000004 · wk-form4_1731983300.xml · nonDerivative · entry 2

Corbett Ryan · CIK 0001831686 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 295,021

F2 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.29 to $18.35. 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: 0001831746-24-000004 · wk-form4_1731983699.xml · nonDerivative · entry 2

Litinsky James H. · CIK 0001831746 · Director · Chairman and CEO · 10% owner

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: 18,221,776

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $18.05 to $18.68. 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.