As of the latest Form 4 filed Jun 17, 2026.
What Century Aluminum Company insiders — officers, directors and 10% owners — have bought and sold in their own stock, straight from their SEC Form 4 filings. Values are shares × the reported transaction price where both are disclosed.
Buys plotted up, sells down; bar height is the disclosed dollar value (shares × reported price). Our Form 4 history is only complete from mid-2026, so early months are sparse — the series fills in as more filings land. Open-market purchases and sales only.
Newest filing first — the 21 most recent filings for CENX.
| Filed | Trade date | Insider | Transaction | Shares | Price | Value | 10b5-1 | Filing |
|---|---|---|---|---|---|---|---|---|
| 2026-06-17 | 2026-06-15 | Berntzen Jarl Director | AAward | +2.17K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-17 | 2026-06-15 | GLASSER ERROL Director | AAward | +2.17K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-17 | 2026-06-15 | Michelmore Andrew G Director | FTax | −652.00 | $54.55 | $35.6K | No | Form 4 ↗ |
| 2026-06-17 | 2026-06-15 | Michelmore Andrew G, Director | AAward | +2.17K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-17 | 2026-06-15 | Bush Jennifer Mary Director | AAward | +2.17K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-06-17 | 2026-06-15 | Olivier Tamla A Director | AAward | +2.17K | $0.00 | $0.00 | No | Form 4 ↗ |
| 2026-03-27 | 2026-03-25 | Trpkovski Peter A EVP, CFO | SSale | −16.7K | $50.51 | $845K | No | Form 4 ↗ |
| 2026-03-17 | 2026-03-16 | Gary Jesse E President and CEO | SSale | −150K | $55.47 | $8.32M | Yes (planned) | Form 4 ↗ |
| 2026-03-13 | 2026-03-12 | Calloway Kenneth L SVP, Human Resources | SSale | −18.0K | $58.00 | $1.04M | No | Form 4 ↗ |
| 2026-03-13 | 2026-03-11 | Hoffman Robert F SVP, IT and CAO | SSale | −10.5K | $56.51 | $595K | No | Form 4 ↗ |
| 2026-03-06 | 2026-03-04 | Hoffman Robert F SVP, IT and CAO | SSale | −10.0K | $56.33 | $563K | No | Form 4 ↗ |
| 2026-03-04 | 2026-03-04 | GLENCORE INTERNATIONAL AG 10% owner | SSale | −6.32M | $51.75 | $327M | No | Form 4 ↗ |
| 2026-03-04 | 2026-03-03 | Aboud Matt SVP, Strategy & Business Dev't | SSale | −2.97K | $52.67 | $156K | No | Form 4 ↗ |
| 2026-03-04 | 2026-03-02 | Aboud Matt, SVP, Strategy & Business Dev't | SSale | −12.1K | $52.50 | $637K | No | Form 4 ↗ |
| 2026-03-03 | 2026-02-27 | Hafberg Agust F SVP & Chief Commercial Officer | SSale | −22.9K | $51.24 | $1.17M | No | Form 4 ↗ |
| 2026-02-27 | 2026-02-25 | Gudlaugsson Gunnar EVP - Global Operations | SSale | −43.0K | $54.10 | $2.33M | No | Form 4 ↗ |
| 2026-02-25 | 2026-02-23 | DeZee John EVP, GC and Secretary | SSale | −66.0K | $50.72 | $3.35M | No | Form 4 ↗ |
| 2026-02-11 | 2026-02-09 | Trpkovski Peter A EVP, CFO | FTax | −4.24K | $54.36 | $230K | No | Form 4 ↗ |
| 2026-01-23 | 2026-01-23 | Gary Jesse E President and CEO | SSale | −150K | $48.19 | $7.23M | Yes (planned) | Form 4 ↗ |
| 2026-01-23 | 2026-01-12 | Gary Jesse E, President and CEO | GGift | +315K | $0.00 | $0.00 | Yes (planned) | Form 4 ↗ |
| 2026-01-23 | 2026-01-12 | Gary Jesse E, President and CEO | GGift | −315K | $0.00 | $0.00 | Yes (planned) | Form 4 ↗ |
Insiders — a company’s officers, directors and holders of more than 10% of its stock — must report any trade in that stock to the SEC on a Form 4 within two business days. Each row here is one transaction from those filings.
The transaction code tells you what happened: Purchase (P) and Sale (S) are open-market trades — the ones markets watch most; Award (A) is a granted stock or unit, Option exercise (M) converts options into shares, and Gift (G) is a transfer for no consideration. Awards, exercises and gifts are largely compensation or administrative, not a directional bet.
One caveat on sales: many are made under a Rule 10b5-1 plan scheduled months in advance, so a sale is not automatically a bearish signal. Insider activity is a noisy input — read it alongside the filings, not on its own.
See also CENX’s full analysis or the market-wide insider trading feed. The tabs above jump to CENX’s other SEC data.
Source: SEC Form 4 filings for CENX, parsed from EDGAR. Transaction prices are as reported in the filing — SEC public-domain data, not market quotes. Values are shares × reported price where both are disclosed; grants and gifts often carry no price. A delayed record of what insiders reported, not a live position or a recommendation.
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