Century Aluminum Company
DE ˙ DB ˙ US1564311082
52,38 € ↓ -5,88 (-10,09%)
2026-06-05
DEL PRIS
SecurityDE:EY3 / Century Aluminum Company
InstitutionKeebeck Alpha, LP
Latest Disclosed Ownership3,915 shares
Latest Disclosed Value $ 229,771
Keebeck Alpha, LP ownership in EY3 / Century Aluminum Company

On May 13, 2026 - Keebeck Alpha, LP filed a 13F-HR form disclosing ownership of 3,915 shares of Century Aluminum Company (DE:EY3) valued at $197,786 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 3, 2025 disclosing 0 shares of Century Aluminum Company. The current value of the position is $205,068 USD.

Institutional Ownership: 13F and NPORT Filings

The Security and Class in the table below are shown exactly as filed by the investor. We do our best to track continuity of investments through acquisitions, and this will be reflected in the table as changes in names. In addition to descriptive data, performance of the investment is shown over time. To calculate quarterly performance, we first calculate cost basis of the shares purchased during the quarter, then use that to calculate gross profit. Quarterly return is Gross Profit / Starting Portfolio value.

Note that cost basis is calculated and stored in thousands, so small quarterly changes in shares frequently result in a cost basis of zero.

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Disclosed Equity Positions (from 13F/NPORT Filings)
File
Date		 Effective
Date		Form Security Class ID Avg Price
Paid (Est)		 Reported
Shares		 ΔShares ΔShares
(%)		 Reported
Value
(x1000)		 ΔValue
(%)		 Alloc
(%)		 ΔAlloc ΔAlloc (%) Cost Basis
(x1000)		 Unrealized
Gain/Loss
(x1000)
2026-05-13 2026-03-31 13F CENTURY ALUM COM 156431108 3,915 3,915 230 0.6999
2025-02-03 2024-12-31 13F CENTURY ALUM COM 156431108 0 -11,096 -100.00 0 -100.00
2024-10-31 2024-09-30 13F CENTURY ALUM COM 156431108 11,096 11,096 180 0.1172
2024-08-12 2024-06-30 13F CENTURY ALUM COM 156431108 0 -10,318 -100.00 0 -100.00
2024-05-13 2024-03-31 13F CENTURY ALUM COM 156431108 10,318 10,318 159 0.1042
2024-02-12 2023-12-31 13F CENTURY ALUM COM 156431108 0 -10,276 -100.00 0 -100.00
2023-11-02 2023-09-30 13F CENTURY ALUM COM 156431108 10,276 -12,033 -53.94 74 -62.37 0.0724
2023-07-25 2023-06-30 13F CENTURY ALUM COM 156431108 22,309 22,309 195 0.1917
2021-11-09 2021-09-30 13F CENTURY ALUMINUM COMPANY COM 156431108 0 -15,619 -100.00 0 -100.00
2021-08-04 2021-06-30 13F CENTURY ALUMINUM COMPANY COM 156431108 15,619 15,619 201 0.0700
2021-02-05 2020-12-31 13F CENTURY ALUMINUM COMPANY COM 156431108 0 -56,806 -100.00 0 -100.00
2020-11-02 2020-09-30 13F CENTURY ALUMINUM COMPANY COM 156431108 56,806 56,806 404 0.2061
Legend
Shares
The total number of shares held by the institution at the end of the reporting period (the effective date). This is provided in the filing.
Value
The total value of the shares as of the effective date. This is provided in the filing.
Avg. Share Price
The weighted average share price of the shares held by the institution. We use FIFO accounting to determine this price
Class
This is the security class as indicated by the filer. There are a variety of values for this field. Common values include "EC" = equity common, "EP" - equity preferred
Allocation (%)
The percent of the institution's portfolio that this position represents. This is provided in NPORT filings. For 13F filings, we calculate it.
Change in Allocation
The change in allocation from the prior reporting period. This is calculated as current allocation - prior allocation.
Change in Allocation (%)
The percent change in allocation from the prior reporting period. This is calculated as (current allocation - prior allocation) / prior allocation.
Cost Basis
The total cost of the shares held. This is calculated as reported shares * avg. share price
Unrealized Gain/Loss
This is the market value of the position as of the effective date minus the cost basis.