ADAGE CAPITAL PARTNERS GP, L.L.C.

Position in USAR — USA Rare Earth, Inc.

CIK 1165408 Boston, MA

Position in USAR

as of Mar 31, 2026 · filed May 15, 2026 Compact

Position Value

$17,556,600

New position

Shares Held

1,160,000

first reported quarter

Ownership

0.520%

of shares outstanding

% of Portfolio

0.03%

of 13F equity value

Holder Rank

—

not a current holder

Holding Since

Mar 2026

1 quarter on record

Voting authority Sole 100% Shared 0% None 0%

Basic Materials · as of Mar 31, 2026

ADAGE CAPITAL PARTNERS GP, L.L.C. holds $73,953,191 across 4 Other Industrial Metals & Mining names. USAR ranks #2 (23.7% of the industry book) .

#	Ticker	Company	Shares	Value (USD)
1	RIO	Rio Tinto PLC	524,602	$48,940,120
2	USAR	USA Rare Earth, Inc. This page	1,160,000	$17,556,600
3	LZM	Lifezone Metals Ltd	1,788,295	$6,008,671
4	MP	MP Materials Corp. / DE	30,000	$1,447,800

1 filing row on record

Report Date	Value (USD)	Shares	Change	Type	Discretion	Filed
2026-03-31	$17,556,600	1,160,000	—	Shares	Sole	2026-05-15
No filing history on record for this holder in this stock.