Century Aluminum CENX Insider Ownership

NASDAQ CENX

$34.37 -0.66 (-1.88%)

As of: Oct 19, 2026 · 3:59 PM EDT

Insider Holdings by Owner

25.32Mn Shares

Insider Ownership Statistics

as of 30 Sep, 2026

Insider Ownership

31.52%

■0% pp QoQ

Shares Held by Insiders

31.20Mn

filed for Sep 2026

■0.00% QoQ

Shares Outstanding

99.00Mn

99,000,000 shares

Direct Holdings

13.56Mn

Indirect: 17.65Mn

Net Shares Traded (QoQ)

no net change in Sep 2026

Insiders Holding Shares

with Form 4 holdings on file

Shares Owned by Insiders

Shares held % of outstanding

Latest —

Average ownership —

Peak ownership —

Shares Purchased/Sold by Insiders

Bought Sold

Latest quarter —

Net over range —

Buying quarters —

Insider Ownership Summary

Updated Oct 5, 2026

Over the trailing 12 months, CENX insiders sold $625.3 million worth of shares (15.82Mn shares) in open-market trades, with no open-market purchases.

Behind Century Aluminum's open-market sales in the past 12 months were 9 insiders, and no insider bought.
Glencore International AG (10% owner) led open-market sales of Century Aluminum stock over the past 12 months with $599.06 million (15.32Mn shares), most recently on March 4, 2026.
The latest open-market trade in CENX stock by an insider was a sale of 16.74K shares for $845,487 by Peter A. Trpkovski (EVP, CFO) on March 25, 2026.
Outside the open market, Century Aluminum insiders received 825.85K shares in stock awards, acquired 4.95Mn shares through option exercises and conversions, gave up 459.87K shares to cover taxes or exercise prices and gave away 314.61K shares as gifts over the past 12 months.
Business Quant data shows Century Aluminum insiders holding 31.2Mn shares in total in their latest Form 4 filings, or 31.52% of the 99Mn shares outstanding; that total is unchanged from 31.2Mn shares at the end of Q2 2026 and down 25.16% from 41.69Mn shares at the end of Q3 2025.
Century Aluminum insiders hold 13.56Mn shares directly (43.44% of their total) and 17.65Mn shares (56.56%) indirectly, through entities such as trusts and partnerships.
Per Business Quant, 15 insiders of CENX hold shares, counting officers, directors and 10% owners who have filed a Form 4 in the past two years.
Century Aluminum's three biggest insider holders are Glencore International AG (10% owner, 29.69Mn shares), Jesse E. Gary (President and CEO, 419.81K shares) and Jarl Berntzen (Director, 211.12K shares), based on their latest Form 4 filings.
Glencore International AG holds 95.15% of the combined insider position in Century Aluminum.
In the past year, 14 insiders of Century Aluminum submitted 26 Form 4 filings reporting trades, awards or other transactions.
The insider holdings and trades above for Century Aluminum reflect Form 4 filings through June 17, 2026.

Form 4 Holdings

Insiders Holding CENX

Insiders 18

Shares held 25.32Mn

Of outstanding 25.58%

#	Insider	Position	Direct	Indirect	Total	Share of Insiders	Last Filed
1	International Ag Glencore	TenPercentOwner	12,184,755	0	12,184,755	48.1%	04 Mar, 2026
2	Ag Glencore	TenPercentOwner	11,701,321	0	11,701,321	46.2%	30 Sep, 2022
3	Jarl Berntzen	Director	211,123	0	211,123	0.8%	17 Jun, 2026
4	Jesse E Gary	President And Ceo	0	142,580	142,580	0.6%	17 Mar, 2026
5	Gunnar Gudlaugsson	Evp Global Operations	136,393	0	136,393	0.5%	27 Feb, 2026
6	Errol Glasser	Director	120,869	0	120,869	0.5%	17 Jun, 2026
7	Craig C Conti	Evp Chief Financial Officer	117,018	0	117,018	0.5%	01 Mar, 2022
8	Gerald C Bialek	Chief Financial Officer	100,620	0	100,620	0.4%	03 Jan, 2025
9	John Dezee	Evp, Gc And Secretary	97,647	0	97,647	0.4%	25 Feb, 2026
10	Andrew G Michelmore	Director	90,609	0	90,609	0.4%	17 Jun, 2026
11	Michelle Harrison	Sr. Vp Finance Treasurer	80,947	0	80,947	0.3%	04 Jan, 2023
12	Matt Aboud	Svp, Strategy Business Dev'T	64,843	0	64,843	0.3%	04 Mar, 2026
13	Peter A Trpkovski	Evp, Cfo	64,125	0	64,125	0.3%	27 Mar, 2026
14	Robert F Hoffman	Svp, It And Cao	56,643	0	56,643	0.2%	13 Mar, 2026
15	Jennifer Mary Bush	Director	49,044	0	49,044	0.2%	17 Jun, 2026
16	Agust F Hafberg	Svp Chief Commercial Officer	45,059	0	45,059	0.2%	03 Mar, 2026
17	Tamla A Olivier	Director	31,845	0	31,845	0.1%	17 Jun, 2026
18	Kenneth L Calloway	Svp, Human Resources	24,902	0	24,902	0.1%	13 Mar, 2026

Each row is that insider’s most recently reported position, from Form 4 filings over the last 60 months — which is why this total does not tie to the quarterly series above, where a quarter counts only the insiders who filed in it. Shares held through a fund or institutional portfolio are counted on the institutional ownership page instead.

Form 4 Filings

930 Insider Transactions

Source SEC Form 4

Latest quarter Sep 2026

Date	Insider	Position	Transaction	Shares	Price	Value	Shares Held After	Ownership
15 Jun, 2026	Jarl Berntzen	Director	Acquired A	2,172	$0.00	$0	211,123	Direct
15 Jun, 2026	Errol Glasser	Director	Acquired A	2,172	$0.00	$0	120,869	Direct
15 Jun, 2026	Jennifer Mary Bush	Director	Acquired A	2,172	$0.00	$0	49,044	Direct
15 Jun, 2026	Tamla A Olivier	Director	Acquired A	2,172	$0.00	$0	31,845	Direct
15 Jun, 2026	Andrew G Michelmore	Director	Acquired A	2,172	$0.00	$0	91,261	Direct
15 Jun, 2026	Andrew G Michelmore	Director	Disposed F	652	$54.55	$35.57K	90,609	Direct
25 Mar, 2026	Peter A Trpkovski	Evp, Cfo	Disposed S	16,739	$50.51	$845.49K	64,125	Direct
16 Mar, 2026	Jesse E Gary	President And Ceo	Disposed S	150,000	$55.47	$8.32Mn	142,580	Indirect
12 Mar, 2026	Kenneth L Calloway	Svp, Human Resources	Disposed S	18,000	$58.00	$1.04Mn	24,902	Direct
11 Mar, 2026	Robert F Hoffman	Svp, It And Cao	Disposed S	10,529	$56.51	$594.99K	56,643	Direct
04 Mar, 2026	Robert F Hoffman	Svp, It And Cao	Disposed S	10,000	$56.33	$563.30K	67,172	Direct
02 Mar, 2026	Matt Aboud	Svp, Strategy Business Dev'T	Disposed S	12,126	$52.50	$636.62K	67,814	Direct
04 Mar, 2026	International Ag Glencore	TenPercentOwner	Disposed S	6,315,245	$51.75	$326.81Mn	12,184,755	Direct
03 Mar, 2026	Matt Aboud	Svp, Strategy Business Dev'T	Disposed S	2,971	$52.67	$156.48K	64,843	Direct
27 Feb, 2026	Agust F Hafberg	Svp Chief Commercial Officer	Disposed S	22,884	$51.24	$1.17Mn	45,059	Direct
25 Feb, 2026	Gunnar Gudlaugsson	Evp Global Operations	Disposed S	43,000	$54.10	$2.33Mn	136,393	Direct
23 Feb, 2026	John Dezee	Evp, Gc And Secretary	Disposed S	66,000	$50.72	$3.35Mn	97,647	Direct
09 Feb, 2026	Peter A Trpkovski	Evp, Cfo	Disposed F	4,240	$54.36	$230.49K	80,864	Direct
12 Jan, 2026	Jesse E Gary	President And Ceo	Disposed G	314,611	$0.00	$0	277,227	Direct
12 Jan, 2026	Jesse E Gary	President And Ceo	Acquired G	314,611	$0.00	$0	442,580	Indirect

Showing 1 to 20 of 930 transactions