Beta59% was sold under disclosed trading plans, 41% with no plan disclosed. The largest seller, Jesse Gary (President and CEO, Director), sold $15.5M.Share-of-stake figures for this company are being verified and will be added when that check is finished. Why
A share of stake is shown for 0 of the 8 officers and directors who sold. 13 are left out Disclosed company stock is not an insider's whole wealth.i
Left out: Jesse Gary, Jarl Berntzen, Gunnar Gudlaugsson, John DeZee, Errol Glasser, Andrew Michelmore, Peter Trpkovski, Matt Aboud, Robert Hoffman, Agust Hafberg, Jennifer Bush, Tamla Olivier and Kenneth Calloway (share of stake is being verified).
Officers and directors, past 12 months. Their share of stake is being verified and is not shown yet; amounts and trading plans are below.
Officers and directors, Oct 2025 to Oct 2026. Each sale is counted once: under a disclosed plan, else to cover taxes, else no plan disclosed.
No officer or director trades were reported for the past 30 days. The most recent before that:
| Who | Shares | Price | % of total stake | Total stake after | Trade date | Filed |
|---|---|---|---|---|---|---|
| Andrew Michelmore Director | 652 | $54.55 | n/a | n/a | Jun 15, 2026 | Jun 17, 2026 |
Glencore AG sold $599M in the past 12 months. Large shareholders and the funds or companies that board members represent are not part of management, so they are left out of the figures above.
Yes. Jesse Gary sold 300K shares ($15.5M) in the past 12 months, all of it under a trading plan disclosed in the filings.
Filings rarely give a reason, and we don't guess at one. What they show is how the sales were made: 59% of sales by value ran under 10b5-1 trading plans disclosed in the filings and 41% had no disclosed plan. A trading plan schedules sales in advance.
No. Officers and directors reported no purchases in the past 12 months.
| Who sold | Amount | % of holdings | Trading plan |
|---|---|---|---|
| Jesse Gary President and CEO, Director | $15.5M 300K shares | Not confirmedshare of stake is being verified. Why | Disclosed plan |
| John DeZee EVP, GC and Secretary | $3.3M 66K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Gunnar Gudlaugsson EVP - Global Operations | $2.3M 43K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Agust Hafberg SVP & Chief Commercial Officer | $1.2M 23K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Robert Hoffman SVP, IT and CAO | $1.2M 21K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Kenneth Calloway SVP, Human Resources | $1.0M 18K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Peter Trpkovski EVP, CFO | $845K 17K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
| Matt Aboud SVP, Strategy & Business Dev't | $793K 15K shares | Not confirmedshare of stake is being verified. Why | No plan disclosed |
Outside holder, reported separately: Glencore AG (a 10% owner, not part of management). Sold $599M (15.32M shares) from Nov 10, 2025 to Mar 4, 2026. Latest filing
Vested shares across all share classes, held directly and through trusts, LLCs and family members, as reported on SEC Forms 3, 4 and 5. Unvested awards and options are never counted as owned shares.
| Insider | Held Oct 16, 2025 | Sold | Held Oct 16, 2026 | Still held |
|---|---|---|---|---|
Jesse Gary!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Jesse Gary are complete. President and CEO, Director | n/a | −300K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Jesse GaryHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Jesse Gary are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −271Kwithheld by the company for taxes | ||||
Jarl Berntzen!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Jarl Berntzen are complete. Director | n/a | 0 | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Jarl BerntzenHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Jarl Berntzen are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Gunnar Gudlaugsson!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Gunnar Gudlaugsson are complete. EVP - Global Operations | n/a | −43K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Gunnar GudlaugssonHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Gunnar Gudlaugsson are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −63Kwithheld by the company for taxes | ||||
John DeZee!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for John DeZee are complete. EVP, GC and Secretary | n/a | −66K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for John DeZeeHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for John DeZee are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −33Kwithheld by the company for taxes | ||||
Errol Glasser!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Errol Glasser are complete. Director | n/a | 0 | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Errol GlasserHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Errol Glasser are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Andrew Michelmore!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Andrew Michelmore are complete. Director | n/a | 0 | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Andrew MichelmoreHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Andrew Michelmore are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −652withheld by the company for taxes | ||||
Peter Trpkovski!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Peter Trpkovski are complete. EVP, CFO | n/a | −17K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Peter TrpkovskiHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Peter Trpkovski are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −16Kwithheld by the company for taxes | ||||
Matt Aboud!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Matt Aboud are complete. SVP, Strategy & Business Dev't | n/a | −15K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Matt AboudHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Matt Aboud are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −25Kwithheld by the company for taxes | ||||
Robert Hoffman!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Robert Hoffman are complete. SVP, IT and CAO | n/a | −21K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Robert HoffmanHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Robert Hoffman are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −19Kwithheld by the company for taxes | ||||
Agust Hafberg!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Agust Hafberg are complete. SVP & Chief Commercial Officer | n/a | −23K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Agust HafbergHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Agust Hafberg are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −23Kwithheld by the company for taxes | ||||
Jennifer Bush!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Jennifer Bush are complete. Director | n/a | 0 | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Jennifer BushHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Jennifer Bush are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Tamla Olivier!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Tamla Olivier are complete. Director | n/a | 0 | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Tamla OlivierHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Tamla Olivier are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) | ||||
Kenneth Calloway!Holdings and share of stake are being verified. Share-of-stake figures and holdings for this company are held back while they are verified. Sales and other transactions for Kenneth Calloway are complete. SVP, Human Resources | n/a | −18K | n/a | n/a |
Vesting, gifts, unvested awards and holding lines for Kenneth CallowayHoldings and share of stake are being verified. Sales, proceeds, plan and tax status and dates for Kenneth Calloway are complete; balances and unit counts will be added when the check is finished. 0gifted (net of own trusts) −9.2Kwithheld by the company for taxes | ||||
Holdings and share of stake for Century Aluminum Co are being verified, so no balances, unit counts or percentages are shown. Sales, proceeds, plan and tax status, titles and dates come straight from individual filings.
Officer and director open-market sales: $26.2M across 502,249 shares. Plan status and stated purpose are separate questions, and a sale can have both.
The lighter segment is sales with no plan disclosed in the filing ($10.7M), including tax-related sales outside a plan.
Sales with no 10b5-1 plan and no tax reference in the filing. $3.3M of it is John DeZee. No plan disclosed is a statement about the filing, not about why the sale happened. Largest such sale: John DeZee, Feb 23, 2026
459,868 shares ($18.1M) were withheld by the company for taxes, which isn't a market sale.
| Seller | Shares sold | Proceeds | Under a disclosed plan | Share of total | Sales dates |
|---|---|---|---|---|---|
| Jesse Gary President and CEO, Director | 300K | $15.5M | 100% | 59% | Jan 23, 2026 to Mar 16, 2026 |
| John DeZee EVP, GC and Secretary | 66K | $3.3M | 0% | 13% | Feb 23, 2026 to Feb 23, 2026 |
| Gunnar Gudlaugsson EVP - Global Operations | 43K | $2.3M | 0% | 9% | Feb 25, 2026 to Feb 25, 2026 |
| Agust Hafberg SVP & Chief Commercial Officer | 23K | $1.2M | 0% | 4% | Feb 27, 2026 to Feb 27, 2026 |
| Robert Hoffman SVP, IT and CAO | 21K | $1.2M | 0% | 4% | Mar 4, 2026 to Mar 11, 2026 |
| Kenneth Calloway SVP, Human Resources | 18K | $1.0M | 0% | 4% | Mar 12, 2026 to Mar 12, 2026 |
| Peter Trpkovski EVP, CFO | 17K | $845K | 0% | 3% | Mar 25, 2026 to Mar 25, 2026 |
| Matt Aboud SVP, Strategy & Business Dev't | 15K | $793K | 0% | 3% | Mar 2, 2026 to Mar 3, 2026 |
| Month | Sale proceeds | Disclosed plan | To cover taxes | No plan disclosed |
|---|---|---|---|---|
| Oct 2025 | $0 | $0 | $0 | $0 |
| Nov 2025 | $0 | $0 | $0 | $0 |
| Dec 2025 | $0 | $0 | $0 | $0 |
| Jan 2026 | $7.2M | $7.2M | $0 | $0 |
| Feb 2026 | $6.8M | $0 | $0 | $6.8M |
| Mar 2026 | $12.2M | $8.3M | $0 | $3.8M |
| Apr 2026 | $0 | $0 | $0 | $0 |
| May 2026 | $0 | $0 | $0 | $0 |
| Jun 2026 | $0 | $0 | $0 | $0 |
| Jul 2026 | $0 | $0 | $0 | $0 |
| Aug 2026 | $0 | $0 | $0 | $0 |
| Sep 2026 | $0 | $0 | $0 | $0 |
| Oct 2026 | $0 | $0 | $0 | $0 |
More than usual: $26.2M sold, after almost none in the past 5 years. 8 insiders sold; the average is 4 a year.
| 12 months ending | Shares sold | Insiders who sold | Proceeds |
|---|---|---|---|
| Oct 16, 2026 Latest 12 months | 502K | 8 | $26.2M |
| Oct 16, 2025 1 year earlier | 145K | 6 | $3.1M |
| Oct 16, 2024 2 years earlier | 228K | 4 | $3.1M |
| Oct 17, 2023 3 years earlier | 0 | 0 | $0 |
| Oct 17, 2022 4 years earlier | 148K | 5 | $2.2M |
| Oct 17, 2021 5 years earlier | 250K | 5 | $3.5M |
Open-market sales (Form 4 code S) by people who were officers or directors, in split-adjusted shares. Earlier years include people who have since left. A sale that an outside holder also reports (a family trust, a fund) is counted with outside holders in every year. Shares, not dollars, are compared, so a change in the stock price doesn't look like a change in selling. Years the filings don't fully cover are shown but left out of the average.
Holdings and share of stake are being verified. Balances, unit counts and every share-of-stake figure for Century Aluminum Co are held back until that check is finished. Sales, proceeds, plan and tax status, titles and dates come straight from individual filings and are complete.
External context: we only cite outside events when a documented connection exists. None is shown for this period.
All 748 Forms 3, 4 and 5 on record for Century Aluminum Co (SEC CIK 949157), filed from Dec 16, 2002 to Jun 17, 2026; 26 of them were filed in the 12 months this page covers, retrieved from SEC EDGAR on Oct 16, 2026. Prices are the ones reported in each filing, often weighted averages. 12 older filings exist only on paper and could not be read.
Holdings. Each holding line (a share class plus an owner, such as a trust or LLC) carries its last reported balance forward. Entities first reported during the period start at zero, so transfers between an insider's own trusts don't count as selling. Lines not reported for three years or more are listed separately and left out of totals.
Sales. A sale counts as under a 10b5-1 plan if its footnote cites one or the filing's Rule 10b5-1 box is checked, and as tax-related if its footnote cites tax obligations or sell-to-cover. Shares withheld by the company for taxes are listed separately. Sales with neither attribute are labeled "no plan disclosed".
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