13F Insight
DOSSIER · 13F Holders · Q1 2026Basic Materials · Primary Production of AluminumCyclicalNet sold
CENX

CENTURY ALUM CO

400 institutions still hold CENTURY ALUM CO as of Q1 2026. Tracked across SEC 13F-HR filings, with insider and 13D/G activity surfaced alongside.

CUSIP 156431108·Primary Production of Aluminum·400 13F holders·last filed Mar 31, 2026
Market cap
—
▼ 9.0%
vs prior quarter
13F value held
$4.4B
79.0% inst. owned
of float
Holders
400
-15 QoQ
filers reporting
Activity
+56 / −95
+793 added · −683 reduced
this quarter
Concentration
39.97%
Glencore plc #1
top holder share
AI Holders Summary · Q1 2026

400 institutions reported CENX in Q1 2026. Glencore plc leads at 40.0% of the visible book. -15 net institutions QoQ — distribution reading.

Top holders

Sorted by position value. Source: SEC EDGAR 13F-HR filings.

#HolderValueShares% port.Quarter
01
Glencore plc
CIK 0001521365
$1.7B29.7M29.46%Q1 202602
BlackRock, Inc.
CIK 0002012383
$529M9.0M0.01%Q1 202603
STATE STREET CORP
CIK 0000093751
$274M4.7M0.01%Q1 202604
Vanguard Portfolio Management
CIK 0002100121
$249M4.2M0.01%Q1 202605
Sourcerock Group LLC
CIK 0001822531
$158M2.7M6.36%Q1 202606
FMR LLC
CIK 0000315066
$156M2.7M0.01%Q1 202607
VANGUARD CAPITAL MANAGEMENT LLC
CIK 0002100119· Index
$152M2.6M0.00%Q1 202608
DIMENSIONAL FUND ADVISORS LP
CIK 0000354204· Quasi-passive
$129M2.2M0.03%Q1 202609
Invesco Ltd.
CIK 0000914208
$122M2.1M0.02%Q1 202610
MILLENNIUM MANAGEMENT LLC
CIK 0001273087
$117M2.0M0.05%Q1 202611
Assenagon Asset Management S.A.
CIK 0001546007
$107M1.8M0.16%Q1 202612
UBS Group AG
CIK 0001610520
$102M1.7M0.02%Q1 202613
MORGAN STANLEY
CIK 0000895421
$93M1.6M0.01%Q1 202614
JANE STREET GROUP, LLC
CIK 0001595888· Market maker
$93M1.6M0.01%Q1 202615
GEODE CAPITAL MANAGEMENT, LLC
CIK 0001214717· Index
$90M1.5M0.01%Q1 202616
Impala Asset Management LLC
CIK 0001317679
$57M975K26.66%Q1 202617
Fisher Asset Management, LLC
CIK 0000850529
$50M851K0.02%Q1 202618
MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd.
CIK 0001705339
$47M800K0.06%Q1 202619
D. E. Shaw & Co., Inc.
CIK 0001009207
$47M1.2M0.03%Q4 202520
SUSQUEHANNA INTERNATIONAL GROUP, LLP
CIK 0001446194· Market maker
$46M786K0.01%Q1 2026
Page 1 of 20
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