$CENX

$33.36 +$1.56 (4.91%) Close

$CENX Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 99.0M shares outstanding

Who owns CENX?

By type of holder

Institutions 100.0% Insiders 0.0% Everyone else 0.0%

Concentration Top 10 holders own 108.2%

Glencore International AG 30.0% · Glencore plc 30.0%

Institutional ownership

100.0%

0 pts vs last qtr

Institutional holders

414

+27 vs last qtr

Net shares bought

+2.9M

by institutions in Q2 2026

New / sold out

91 / 64

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

BlackRock, Inc. +1.3M
State Street Corp +875.2K

Biggest sellers in Q2 2026

Jane Street Group, LLC −1.2M
Citadel Advisors LLC −1.0M

Who is planning to sell?

Notices of proposed sale, last 12 months

$329M

11 notices from 10 people

Shares covered

15.9M

16.09% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Glencore International AG 10% stockholder $297M
Jesse E. Gary President, ceo, director 10b5-1 $14.5M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2011–FY2025

+3.3%

+0.36% a year

Each share's claim on the business

−3.2%

shrank without buying or selling a share

Spent on buybacks vs paid in stock

$45.9M vs $75M

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years45% 3–5 years3% 1–3 years39% Under 1 year13%

Quarterly turnover

13.4%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting CENX on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
GP Glencore plc 13D · 30.0%	29.7M	29.99%	Unchanged	2024	28.1%
Shares held by quarter Peak holding40.1M (Q3'25) Change over 8 quarters+29.7M Share of the company29.990% Disclosed stake13D · 30.0% Glencore plc's full portfolio →
B BlackRock, Inc.	10.3M	10.41%	+1.3M (+14.4%)	≤2021	0.0%
Shares held by quarter Peak holding10.7M (Q3'24) Change over 8 quarters−437.4K Share of the company10.410% BlackRock, Inc.'s full portfolio →

Glencore plc

13D · 30.0%

29.7M

% of company

29.99%

Change vs last qtr

Unchanged

Held since

2024

BlackRock, Inc.

10.3M

% of company

10.41%

Change vs last qtr

+1.3M (+14.4%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Century Aluminum Company, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting CENX on Form N-PORT; together they hold 34.1% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
IC iShares Core S&P Small-Cap ETF iShares Trust	$156M	3.4M	3.43%	0.14%	June 30, 2026
SS State Street(R) SPDR(R) S&P(R) Metals & Mining ETF SPDR Series Trust	$144M	3.1M	3.16%	3.28%	June 30, 2026

iShares Core S&P Small-Cap ETF

iShares Trust

Position value

$156M

% of company

3.43%

% of the fund

0.14%

As of

June 30, 2026

State Street(R) SPDR(R) S&P(R) Metals & Mining ETF

SPDR Series Trust

Position value

$144M

% of company

3.16%

% of the fund

3.28%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Century Aluminum Company and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
GI Glencore International AG 5%+ holder 13D · 30.0%	29.7M	29.99%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company29.990% Disclosed stake13D · 30.0% View the 13D/G filing →
GA Glencore AG 5%+ holder 13D · 17.7%	17.5M	17.68%	—	—	—	—
This holder reports through Schedule 13D/G, not a quarterly 13F. Share of the company17.680% Disclosed stake13D · 17.7% View the 13D/G filing →

Glencore International AG

5%+ holder13D · 30.0%

29.7M

% of company

29.99%

Change vs last qtr

—

Held since

—

Glencore AG

5%+ holder13D · 17.7%

17.5M

% of company

17.68%

Change vs last qtr

—

Held since

—

14 more holders behind a free account

See every insider and 5%+ holder of Century Aluminum Company.

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