MP

SEC source: 0002059140-26-000010 · wk-form4_1791937737.xml · nonDerivative · entry 1

Infuso David Gregory · CIK 0002059140 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 48,104

F1 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on October 13, 2026.

SEC source: 0001801368-26-000052 · wk-form4_1790814277.xml · nonDerivative · entry 1

DUCKWORTH CONNIE K · CIK 0001180940 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 42,514

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: 0001801368-26-000043 · wk-form4_1782865877.xml · nonDerivative · entry 1

DUCKWORTH CONNIE K · CIK 0001180940 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,774

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: 0001031609-26-000004 · wk-form4_1781568136.xml · derivative · entry 2

WEISENBURGER RANDALL J · CIK 0001031609 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,998 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · derivative.exercise_price: Restricted stock units convert into common stock on a one-for-one basis.

F2 · derivative.exercise_date: On November 17, 2020, the reporting person was granted 3,998 restricted stock units, which vested on June 1, 2021, and the reporting person's receipt of the shares of common stock was deferred until June 15, 2026.

F2 · derivative.expiration_date: On November 17, 2020, the reporting person was granted 3,998 restricted stock units, which vested on June 1, 2021, and the reporting person's receipt of the shares of common stock was deferred until June 15, 2026.

SEC source: 0001031609-26-000004 · wk-form4_1781568136.xml · nonDerivative · entry 1

WEISENBURGER RANDALL J · CIK 0001031609 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 150,899

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0001801368-26-000041 · wk-form4_1781568190.xml · derivative · entry 2

DUCKWORTH CONNIE K · CIK 0001180940 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,998 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: On November 17, 2020, the reporting person was granted 3,998 restricted stock units, which vested on June 1, 2021, and the reporting person's receipt of the shares of common stock was deferred until June 15, 2026.

F2 · derivative.exercise_date: On November 17, 2020, the reporting person was granted 3,998 restricted stock units, which vested on June 1, 2021, and the reporting person's receipt of the shares of common stock was deferred until June 15, 2026.

F2 · derivative.expiration_date: On November 17, 2020, the reporting person was granted 3,998 restricted stock units, which vested on June 1, 2021, and the reporting person's receipt of the shares of common stock was deferred until June 15, 2026.

SEC source: 0001801368-26-000041 · wk-form4_1781568190.xml · nonDerivative · entry 1

DUCKWORTH CONNIE K · CIK 0001180940 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 41,150

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0001495449-26-000006 · wk-form4_1781568045.xml · derivative · entry 2

Lavan Maryanne · CIK 0001495449 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,998 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: On November 17, 2020, the reporting person was granted 3,998 restricted stock units, which vested on June 1, 2021, and the reporting person's receipt of the shares of common stock was deferred until June 15, 2026.

F2 · derivative.exercise_date: On November 17, 2020, the reporting person was granted 3,998 restricted stock units, which vested on June 1, 2021, and the reporting person's receipt of the shares of common stock was deferred until June 15, 2026.

F2 · derivative.expiration_date: On November 17, 2020, the reporting person was granted 3,998 restricted stock units, which vested on June 1, 2021, and the reporting person's receipt of the shares of common stock was deferred until June 15, 2026.

SEC source: 0001495449-26-000006 · wk-form4_1781568045.xml · nonDerivative · entry 1

Lavan Maryanne · CIK 0001495449 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 23,753

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0001356702-26-000004 · wk-form4_1781567929.xml · derivative · entry 2

MYERS RICHARD B · CIK 0001356702 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 0

Underlying: Common Stock · 3,998 shares

Expires not disclosed

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F2 · derivative.exercise_price: On November 17, 2020, the reporting person was granted 3,998 restricted stock units, which vested on June 1, 2021, and the reporting person's receipt of the shares of common stock was deferred until June 15, 2026.

F2 · derivative.exercise_date: On November 17, 2020, the reporting person was granted 3,998 restricted stock units, which vested on June 1, 2021, and the reporting person's receipt of the shares of common stock was deferred until June 15, 2026.

F2 · derivative.expiration_date: On November 17, 2020, the reporting person was granted 3,998 restricted stock units, which vested on June 1, 2021, and the reporting person's receipt of the shares of common stock was deferred until June 15, 2026.

SEC source: 0001356702-26-000004 · wk-form4_1781567929.xml · nonDerivative · entry 1

MYERS RICHARD B · CIK 0001356702 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 7,792

Exercise/conversion can include RSU settlement. Transaction price and option strike are different fields; a missing price is not zero. Derivative and underlying rows can describe the same event.

F1 · price: Restricted stock units convert into common stock on a one-for-one basis.

SEC source: 0001801368-26-000038 · wk-form4_1781137938.xml · derivative · entry 1

DONALD ARNOLD W · CIK 0001083206 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,038

Underlying: Common Stock · 3,038 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, 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.

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, 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.

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, 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.

SEC source: 0001031609-26-000002 · wk-form4_1781139040.xml · derivative · entry 1

WEISENBURGER RANDALL J · CIK 0001031609 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,038

Underlying: Common Stock · 3,038 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, 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.

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, 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.

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, 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.

SEC source: 0001801368-26-000037 · wk-form4_1781137894.xml · derivative · entry 1

DUCKWORTH CONNIE K · CIK 0001180940 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,038

Underlying: Common Stock · 3,038 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") 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001356702-26-000002 · wk-form4_1781138758.xml · derivative · entry 1

MYERS RICHARD B · CIK 0001356702 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,038

Underlying: Common Stock · 3,038 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, 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.

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, 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.

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, 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.

SEC source: 0001495449-26-000004 · wk-form4_1781138197.xml · derivative · entry 1

Lavan Maryanne · CIK 0001495449 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,038

Underlying: Common Stock · 3,038 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") 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001801368-26-000039 · wk-form4_1781138053.xml · derivative · entry 1

McKnight Andrew A. · CIK 0001680357 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 3,038

Underlying: Common Stock · 3,038 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") 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.

F1 · derivative.exercise_date: 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.

F1 · derivative.expiration_date: 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.

SEC source: 0001832050-26-000007 · wk-form4_1781096503.xml · nonDerivative · entry 1

Rosenthal Michael Stuart · CIK 0001832050 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Indirect · By Rosenthal Family Trust

Disclosed balance after: 136,622

SEC source: 0001831746-26-000018 · wk-form4_1780704325.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: 11,620,798

F4 · price: 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.

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: 0001831746-26-000018 · wk-form4_1780704325.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: 11,756,939

F3 · price: 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.

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: 0001831746-26-000018 · wk-form4_1780704325.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: 11,794,225

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $71.00 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.

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: 0001831746-26-000016 · wk-form4_1780102796.xml · nonDerivative · entry 9

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: 11,805,965

F10 · price: 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.

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: 0001831746-26-000016 · wk-form4_1780102796.xml · nonDerivative · entry 8

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: 11,854,015

F9 · price: 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.

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: 0001831746-26-000016 · wk-form4_1780102796.xml · nonDerivative · entry 7

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: 11,855,965

F8 · price: 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.

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: 0001831746-26-000016 · wk-form4_1780102796.xml · nonDerivative · entry 6

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: 11,951,079

F7 · price: 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.

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: 0001831746-26-000016 · wk-form4_1780102796.xml · nonDerivative · entry 5

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: 11,995,196

F6 · price: 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.

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: 0001831746-26-000016 · wk-form4_1780102796.xml · nonDerivative · entry 4

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: 12,044,461

F5 · price: 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.

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: 0001831746-26-000016 · wk-form4_1780102796.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: 12,083,906

F4 · price: 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.

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: 0001831746-26-000016 · wk-form4_1780102796.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: 12,090,616

F3 · price: 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. 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: 0001831746-26-000016 · wk-form4_1780102796.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: 12,182,852

F1 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $66.00 to $66.19. 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: 0001832050-26-000005 · wk-form4_1779325382.xml · nonDerivative · entry 1

Rosenthal Michael Stuart · CIK 0001832050 · Chief Operating Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 1,333,673

SEC source: 0001831746-26-000014 · wk-form4_1778802792.xml · nonDerivative · entry 4

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: 12,205,965

F5 · price: The price reported in Column 4 is a weighted average price. These shares were sold in multiple transactions at prices ranging from $64.10 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 (5) 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: 0001831746-26-000014 · wk-form4_1778802792.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: 12,289,194

F4 · price: 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 $65.60. 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: 0001831746-26-000014 · wk-form4_1778802792.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: 12,383,153

F3 · price: The price reported in Column 4 is a weighted average price. 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.

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: 0001831746-26-000014 · wk-form4_1778802792.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: 12,486,121

F1 · price: 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.

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: 0001831686-26-000007 · wk-form4_1778289704.xml · nonDerivative · entry 1

Corbett Ryan · CIK 0001831686 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 109,017

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, 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 $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.

SEC source: 0001862894-26-000009 · wk-form4_1778289873.xml · nonDerivative · entry 1

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 54,095

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 November 20, 2025.

SEC source: 0001831746-26-000012 · wk-form4_1776734339.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: 12,505,965

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 $64.24. 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.

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: 0001831746-26-000012 · wk-form4_1776734339.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: 12,765,144

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 $64.28. 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.

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: 0002059140-26-000007 · wk-form4_1775093042.xml · nonDerivative · entry 1

Infuso David Gregory · CIK 0002059140 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 48,442

F1 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on April 1, 2026.

SEC source: 0001801368-26-000011 · wk-form4_1775092952.xml · nonDerivative · entry 1

DUCKWORTH CONNIE K · CIK 0001180940 · Director

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 37,152

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: 0001831686-26-000005 · wk-form4_1773793135.xml · nonDerivative · entry 1

Corbett Ryan · CIK 0001831686 · Chief Financial Officer

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 129,017

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, 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 $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.

SEC source: 0001862894-26-000007 · wk-form4_1773793236.xml · nonDerivative · entry 1

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 61,053

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 November 20, 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 $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.

SEC source: 0002059140-26-000005 · wk-form4_1769129088.xml · nonDerivative · entry 1

Infuso David Gregory · CIK 0002059140 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 49,246

F1 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 22, 2026.

SEC source: 0001862894-26-000005 · wk-form4_1769129297.xml · nonDerivative · entry 1

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: Plan reported

Ownership: Direct

Disclosed balance after: 74,967

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 $68.00 to $68.55. The reporting person undertakes to provide to MP Materials Corp., any security holder of MP Materials Corp., or the staff of the Securities and Exchange Commission, upon request, full information regarding the number of shares sold at each separate price within the range set forth in footnote (2) to this Form 4.

SEC source: 0001831686-26-000003 · wk-form4_1768437674.xml · nonDerivative · entry 6

Corbett Ryan · CIK 0001831686 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 175,017

F6 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 14, 2026.

SEC source: 0001862894-26-000002 · wk-form4_1768437793.xml · nonDerivative · entry 6

Hoops Elliot Dean · CIK 0001862894 · General Counsel and Secretary

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 82,790

F6 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 14, 2026.

SEC source: 0002059140-26-000003 · wk-form4_1768437750.xml · nonDerivative · entry 5

Infuso David Gregory · CIK 0002059140 · Chief Accounting Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 50,444

F5 · shares: Represents shares withheld to satisfy tax withholding obligations applicable to the vesting of restricted stock units that vested on January 14, 2026.

SEC source: 0001831746-26-000008 · wk-form4_1768348785.xml · nonDerivative · entry 5

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

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 216,397

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: 0001831686-26-000003 · wk-form4_1768437674.xml · nonDerivative · entry 5

Corbett Ryan · CIK 0001831686 · Chief Financial Officer

10b5-1 filing: No plan indicated

Ownership: Direct

Disclosed balance after: 178,528

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