X0306 4 2021-03-31 false 0001801368 MP Materials Corp. / DE MP 0001356702 MYERS RICHARD B 6720 VIA AUSTI PARKWAY, SUITE 450 LAS VEGAS NV 89119 true false false false Class A Common Stock 2021-03-31 4 A false 452.00 35.95 A 452.00 D 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. The closing price of MP Class A Common Stock on March 31, 2021 was used to determine the number of DSUs awarded. Excludes unvested restricted stock units ("RSUs") /s/ Sheila Bangalore, attorney in fact for Richard B. Myers 2021-03-31