X0306 4 2023-01-13 0 0001801368 MP Materials Corp. / DE MP 0001831686 Corbett Ryan 1700 S. PAVILION CENTER DRIVE, SUITE 800 LAS VEGAS NV 89135 0 1 0 0 Chief Financial Officer Class A Common Stock 2023-01-13 4 A 0 16931 0.00 A 228407 D Class A Common Stock 2023-01-14 4 F 0 2410 29.53 D 225997 D 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 Class A common stock. Represents shares withheld to satisfy tax withholding obligation applicable to the vesting of 8,919 restricted stock units that vested on January 14, 2023. /s/ Elliot D. Hoops, Attorney-In-Fact for Ryan Corbett 2023-01-17