CENX · Insider Trading
Century Aluminum Co
Every open-market purchase and sale reported by CENX officers, directors and 10%+ beneficial owners on SEC Form 4, which must be filed within two business days of the transaction. Sales often reflect scheduled 10b5-1 plans or tax withholding rather than a directional view, so read counts alongside the size and the filer.
| Filed | Insider | Role | Type | Shares | Value |
|---|---|---|---|---|---|
| 2026-06-17 | Jennifer Mary Bush | Director | A | +2,172 | — |
| 2026-06-17 | Jarl Berntzen | Director | A | +2,172 | — |
| 2026-06-17 | Errol Glasser | Director | A | +2,172 | — |
| 2026-06-17 | Andrew G Michelmore | Director | MIXED | +1,520 | −$35.57K |
| 2026-06-17 | Tamla A Olivier | Director | A | +2,172 | — |
| 2026-03-27 | Peter A Trpkovski | EVP, CFO | Sell | −16,739 | −$845.49K |
| 2026-03-17 | Jesse E Gary | President and CEO | Sell | −150,000 | −$8.32M |
| 2026-03-13 | Kenneth L Calloway | SVP, Human Resources | Sell | −18,000 | −$1.04M |
| 2026-03-13 | Robert F Hoffman | SVP, IT and CAO | Sell | −10,529 | −$594.99K |
| 2026-03-06 | Robert F Hoffman | SVP, IT and CAO | Sell | −10,000 | −$563.30K |
| 2026-03-04 | Matt Aboud | SVP, Strategy & Business Dev't | Sell | −15,097 | −$793.10K |
| 2026-03-04 | Glencore AG | 10%+ Owner | Sell | −18,945,735 | −$980.44M |
| 2026-03-03 | Agust F Hafberg | SVP & Chief Commercial Officer | Sell | −22,884 | −$1.17M |
| 2026-02-27 | Gunnar Gudlaugsson | EVP - Global Operations | Sell | −43,000 | −$2.33M |
| 2026-02-25 | John DeZee | EVP, GC and Secretary | Sell | −66,000 | −$3.35M |
| 2026-02-11 | Peter A Trpkovski | EVP, CFO | F | −4,240 | −$230.49K |
| 2026-01-23 | Jesse E Gary | President and CEO | MIXED | −150,000 | −$7.23M |
| 2026-01-05 | Gunnar Gudlaugsson | EVP - Global Operations | MIXED | +35,589 | −$2.46M |
| 2026-01-05 | Peter A Trpkovski | EVP, CFO and Treasurer | MIXED | +19,613 | −$475.45K |
| 2026-01-05 | John DeZee | EVP, GC and Secretary | MIXED | +30,729 | −$1.30M |
| 2026-01-05 | Jesse E Gary | President and CEO | MIXED | +225,691 | −$10.61M |
| 2026-01-05 | Matt Aboud | SVP, Strategy & Business Dev't | MIXED | +17,351 | −$968.84K |
| 2026-01-05 | Agust F Hafberg | SVP & Chief Commercial Officer | MIXED | +12,683 | −$918.10K |
| 2026-01-05 | Robert F Hoffman | SVP, IT and CAO | MIXED | +18,089 | −$732.00K |
| 2026-01-05 | Kenneth L Calloway | SVP, Human Resources | MIXED | +14,196 | −$360.14K |
| 2025-11-13 | Glencore plc | 10%+ Owner | MIXED | −12,154,227 | −$816.75M |
| 2025-10-02 | Glencore AG | 10%+ Owner | C | +8,544 | — |
| 2025-09-30 | Agust F Hafberg | SVP & Chief Commercial Officer | Sell | −9,493 | −$264.95K |
| 2025-09-23 | Kenneth L Calloway | SVP, Human Resources | Sell | −16,450 | −$452.38K |
| 2025-08-14 | Matt Aboud | SVP, Strategy & Business Dev't | Sell | −12,027 | −$279.87K |
| 2025-07-02 | Glencore plc | 10%+ Owner | C | +49,431 | — |
| 2025-06-18 | Errol Glasser | Director | A | +7,778 | — |
| 2025-06-18 | Tamla A Olivier | Director | A | +7,778 | — |
| 2025-06-18 | Jennifer Mary Bush | Director | A | +7,778 | — |
| 2025-06-18 | Jarl Berntzen | Director | A | +7,778 | — |
| 2025-06-18 | Andrew G Michelmore | Director | MIXED | +5,445 | −$40.50K |
| 2025-04-01 | Glencore plc | 10%+ Owner | C | +10,779 | — |
| 2025-03-25 | Peter A Trpkovski | EVP, CFO and Treasurer | A | +12,455 | — |
| 2025-03-24 | Robert F Hoffman | SVP, IT and CAO | Sell | −5,000 | −$101.20K |
| 2025-03-18 | Robert F Hoffman | SVP, IT and CAO | Sell | −2,500 | −$49.97K |
| 2025-02-10 | Peter A Trpkovski | SVP, Finance and Treasurer | F | −4,501 | −$84.12K |
| 2025-01-29 | Jesse E Gary | President and CEO | G | — | — |
| 2025-01-03 | Gerald C Bialek | Chief Financial Officer | A | +17,534 | — |
| 2025-01-03 | Agust F Hafberg | SVP & Chief Commercial Officer | MIXED | +12,375 | −$177.03K |
| 2025-01-03 | John DeZee | EVP, GC and Secretary | MIXED | +31,035 | −$186.66K |
| 2025-01-03 | Robert F Hoffman | SVP, IT and CAO | MIXED | +14,727 | −$132.15K |
| 2025-01-03 | Peter A Trpkovski | SVP, Finance and Treasurer | MIXED | +7,918 | −$50.14K |
| 2025-01-03 | Gunnar Gudlaugsson | EVP - Global Operations | MIXED | +35,872 | −$435.62K |
| 2025-01-03 | Kenneth L Calloway | SVP, Human Resources | MIXED | +10,649 | −$80.26K |
| 2025-01-03 | Matt Aboud | SVP, Strategy & Business Dev't | MIXED | +15,368 | −$180.03K |
| Insider | Role | Shares Held | Value |
|---|---|---|---|
| GLENCORE INTERNATIONAL AG | 10%+ Owner | 40,034,438 | $1.40B |
| Glencore plc | 10%+ Owner | 36,005,947 | $1.26B |
| Glencore AG | 10%+ Owner | 24,742,111 | $866.72M |
| Jesse E Gary | President and CEO | 419,807 | $14.71M |
| Jarl Berntzen | Director | 211,123 | $7.40M |
| Gunnar Gudlaugsson | EVP - Global Operations | 136,393 | $4.78M |
| Errol Glasser | Director | 120,869 | $4.23M |
| Gerald C Bialek | Chief Financial Officer | 100,620 | $3.52M |
| John DeZee | EVP, GC and Secretary | 97,647 | $3.42M |
| Andrew G Michelmore | Director | 90,609 | $3.17M |
| Matt Aboud | SVP, Strategy & Business Dev't | 64,843 | $2.27M |
| Peter A Trpkovski | EVP, CFO | 64,125 | $2.25M |
| Robert F Hoffman | SVP, IT and CAO | 56,657 | $1.98M |
| Jennifer Mary Bush | Director | 49,044 | $1.72M |
| Agust F Hafberg | SVP & Chief Commercial Officer | 45,059 | $1.58M |
| Tamla A Olivier | Director | 31,845 | $1.12M |
| Kenneth L Calloway | SVP, Human Resources | 24,902 | $872.32K |
Form 4 reports a change in beneficial ownership by an officer, director or 10%+ holder, and must be filed within two business days of the transaction — so this is close to real time, unlike the 45-day-lagged 13F institutional data.
Transaction codes matter more than the raw buy/sell count. Code P is an open-market purchase — an insider choosing to buy with their own money, which is the signal most research treats as informative. Code S is a sale, but sales are frequently pre-scheduled under a 10b5-1 plan or cover tax withholding on vesting equity, so a run of sales often says nothing directional. Codes A and M are grants and option exercises rather than open-market decisions.
Full filing history and per-insider positions are on the CENX quote page; the site-wide leaderboard is on the insider transactions hub.
Market data may be delayed, incomplete, or inaccurate. Not a recommendation to buy, sell, or hold any security. Verify quotes with your broker before trading. See Terms §17.