Century Aluminum CENX Insider Ownership

NASDAQ CENX
$47.28 +0.50 (+1.07%)
At close: Sep 2, 2026 · 4:00 PM EDT

Insider Holdings by Owner

25.32Mn Shares

Insider Ownership Statistics

as of 31 Dec, 2025
Insider Ownership
0.357%
■0% pp QoQ
Shares Held by Insiders
353.99K
filed for Dec 2025
■0.00% QoQ
Shares Outstanding
99.20Mn
99,200,000 shares
Direct Holdings
353.99K
Indirect: 0
Net Shares Traded (QoQ)
0
no net change in Dec 2025
Insiders Holding Shares
18
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

Quarter ending 31 Dec, 2025

As of August 29, 2026, the three largest insider holders of CENX are International Ag Glencore (TenPercentOwner, 17.51Mn shares), International Ag Glencore (TenPercentOwner, 12.18Mn shares), International Ag Glencore (TenPercentOwner, 12.12Mn shares).

Form 4 Holdings

Insiders Holding CENX

Insiders 18
Shares held 25.32Mn
Of outstanding 25.52%
# 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

2,843 Insider Transactions

Source SEC Form 4
Latest quarter Dec 2025
Download Data
Date Insider Position Transaction Shares Price Value Shares Held After Ownership
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 Jarl Berntzen Director Acquired A 2,172 $0.00 $0 211,123 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
25 Mar, 2026 Peter A Trpkovski Evp, Cfo Disposed S 16,739 $50.51 $845.49K 64,125 Direct
25 Mar, 2026 Peter A Trpkovski Evp, Cfo Disposed S 16,739 $50.51 $845.49K 64,125 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
16 Mar, 2026 Jesse E Gary President And Ceo Disposed S 150,000 $55.47 $8.32Mn 142,580 Indirect
16 Mar, 2026 Jesse E Gary President And Ceo Disposed S 150,000 $55.47 $8.32Mn 142,580 Indirect
16 Mar, 2026 Jesse E Gary President And Ceo Disposed S 150,000 $55.47 $8.32Mn 142,580 Indirect
11 Mar, 2026 Robert F Hoffman Svp, It And Cao Disposed S 10,529 $56.51 $594.99K 56,643 Direct
12 Mar, 2026 Kenneth L Calloway Svp, Human Resources Disposed S 18,000 $58.00 $1.04Mn 24,902 Direct
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
11 Mar, 2026 Robert F Hoffman Svp, It And Cao Disposed S 10,529 $56.51 $594.99K 56,643 Direct
12 Mar, 2026 Kenneth L Calloway Svp, Human Resources Disposed S 18,000 $58.00 $1.04Mn 24,902 Direct