X0607 3 2026-09-03 0 0001970622 USA Rare Earth, Inc. USAR 0002151490 Denham Mining GP LLC false C/O DENHAM CAPITAL MANAGEMENT LP 185 DARTMOUTH STREET, 7TH FLOOR BOSTON MA 02116 false false true false 0002151491 Denham Mining GP LP false C/O DENHAM CAPITAL MANAGEMENT LP 185 DARTMOUTH STREET, 7TH FLOOR BOSTON MA 02116 false false true false 0001698097 Denham Mining Fund LP false C/O DENHAM CAPITAL MANAGEMENT LP 185 DARTMOUTH STREET, 7TH FLOOR BOSTON MA 02116 false false true false 0002151494 Pembroke Resources II Holdings (Cayman) LLC false C/O DENHAM CAPITAL MANAGEMENT LP 185 DARTMOUTH STREET, 7TH FLOOR BOSTON MA 02116 false false true false 0002151474 MVB Investment Holdings LLC false C/O DENHAM CAPITAL MANAGEMENT LP 185 DARTMOUTH STREET, 7TH FLOOR BOSTON MA 02116 false false true false 0002151486 Serra Verde Rare Earths Ltd. false C/O DENHAM CAPITAL MANAGEMENT LP 185 DARTMOUTH STREET, 7TH FLOOR BOSTON MA 02116 false false true false Common Stock 46809526 I See Footnote Common Stock 152640 I See Footnote These securities are directly held by Serra Verde Rare Earths Ltd. These securities are directly held MVB Investment Holdings LLC. Serra Verde Rare Earths Ltd. is majority owned by MVB Investment Holdings LLC, whose sole owner is Pembroke Resources II Holdings (Cayman) LLC, whose sole owner is Denham Mining Fund LP. The general partner of Denham Mining Fund LP is Denham Mining GP LP, whose general partner is Denham Mining GP LLC. Each of the Reporting Persons disclaims beneficial ownership over the shares of Common Stock reported herein, except to the extent of their respective pecuniary interest therein, if any, and the filing of this report shall not be deemed an admission that any of the Reporting Persons is the beneficial owner of the securities for purposes of Section 16 of the Securities Exchange Act of 1934, as amended, or for any other purpose. Each of Stuart D. Porter, Carl J. Tricoli, and Robert G. Still is a manager and director of Denham Mining GP LLC, but, in reliance on the "rule of three," each disclaims beneficial ownership over the securities directly held by Serra Verde Rare Earths Ltd. and MVB Investment Holdings LLC. Denham Mining GP LLC, By: /s/ Anthony Fiore, Managing Director 2026-09-11 Denham Mining GP LP, By: Denham Mining GP LLC, its general partner, By: /s/ Anthony Fiore, Managing Director 2026-09-11 Denham Mining Fund LP, By: Denham Mining GP LP, its general partner, By: Denham Mining GP LLC, its general partner, By: /s/ Anthony Fiore, Managing Director 2026-09-11 Pembroke Resources II Holdings (Cayman) LLC, By: /s/ Anthony Fiore, Vice President & Secretary, Managing Director 2026-09-11 MVB Investment Holdings LLC, By: /s/ Anthony Fiore, Vice President & Secretary, Manager on the Board of Managers 2026-09-11 Serra Verde Rare Earths Ltd., By: /s/ Anthony Fiore, Director 2026-09-11