X0306 4 2022-05-27 0 0001801368 MP Materials Corp. / DE MP 0001290162 QVT Financial LP 888 SEVENTH AVENUE, 43RD FLOOR NEW YORK NY 10106 1 0 0 1 Director by Deputization Class A Common Stock 2022-05-27 4 S 0 122405 40.20 D 8476116 I Held by Fourth Avenue FF Opportunities LP - Series E Class A Common Stock 2022-05-27 4 S 0 20045 40.20 D 1388063 I Held by QVT Family Office Onshore LP Class A Common Stock 2022-05-27 4 S 0 99182 40.20 D 6868023 I Held by Saratoga Park Ltd Class A Common Stock 2022-05-31 4 S 0 15855 40.21 D 8460261 I Held by Fourth Avenue FF Opportunities LP - Series E Class A Common Stock 2022-05-31 4 S 0 2595 40.21 D 1385468 I Held by QVT Family Office Onshore LP Class A Common Stock 2022-05-31 4 S 0 12848 40.21 D 6855175 I Held by Saratoga Park Ltd Class A Common Stock 2022-06-01 4 S 0 628 40.06 D 8459633 I Held by Fourth Avenue FF Opportunities LP - Series E Class A Common Stock 2022-06-01 4 S 0 103 40.06 D 1385365 I Held by QVT Family Office Onshore LP Class A Common Stock 2022-06-01 4 S 0 509 40.06 D 6854666 I Held by Saratoga Park Ltd QVT Financial LP and its general partner, QVT Financial GP LLC (together, "QVT"), may be deemed to have beneficial ownership over the 16,699,664 Common Shares held by Saratoga Park Ltd., QVT Family Office Onshore LP and Fourth Avenue FF Opportunities LP - Series E. The filing of this statement shall not be deemed an admission that QVT is the beneficial owner of the securities reported herein for purposes of Section 16 of the Securities Act of 1934, as amended, or otherwise. QVT expressly disclaims beneficial ownership of the securities reported herein except to the extent of its pecuniary interest therein. Fourth Avenue Capital Partners GP LLC is the general partner of Fourth Avenue FF Opportunities LP - Series E and may also be deemed to have beneficial ownership over the Common Shares held by Fourth Avenue FF Opportunities LP - Series E. /s/ Meg Eisner 2022-06-01