Century Aluminum Company
US ˙ NasdaqGS ˙ US1564311082

SecurityCENX / Century Aluminum Company
InstitutionEngineers Gate Manager LP
Latest Disclosed Ownership297,509 shares
Latest Disclosed Value $ 17,460,804
Engineers Gate Manager LP reports 500.74% increase in ownership of CENX / Century Aluminum Company

On May 15, 2026 - Engineers Gate Manager LP filed a 13F-HR form disclosing ownership of 297,509 shares of Century Aluminum Company (US:CENX) valued at $17,460,803 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 17, 2026 disclosing 49,524 shares of Century Aluminum Company. This represents a change in shares of 500.74% during the quarter. The current value of the position is $19,943,516 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.

Upgrade to unlock premium data and export to Excel .

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)
2026-05-15 2026-03-31 13F CENTURY ALUM COM 156431108 297,509 247,985 500.74 17,461 800.00 0.2183
2026-02-17 2025-12-31 13F CENTURY ALUM COM 156431108 49,524 -2,357 -4.54 1,940 27.38 0.0230
2025-11-14 2025-09-30 13F CENTURY ALUM COM 156431108 51,881 51,881 1,523 0.0174
2025-08-14 2025-06-30 13F CENTURY ALUM COM 156431108 0 -28,376 -100.00 0 -100.00
2025-05-15 2025-03-31 13F CENTURY ALUM COM 156431108 28,376 6,986 32.66 527 35.22 0.0089
2025-02-14 2024-12-31 13F CENTURY ALUM COM 156431108 21,390 -3,710 -14.78 390 -4.42 0.0068
2024-11-14 2024-09-30 13F CENTURY ALUM COM 156431108 25,100 -112,846 -81.80 407 -82.38 0.0080
2024-08-14 2024-06-30 13F CENTURY ALUM COM 156431108 137,946 -158,128 -53.41 2,311 -49.30 0.0521
2024-05-15 2024-03-31 13F CENTURY ALUM COM 156431108 296,074 140,933 90.84 4,557 141.95 0.1200
2024-02-14 2023-12-31 13F CENTURY ALUM COM 156431108 155,141 136,061 713.11 1,883 1,274.45 0.0538
2023-11-14 2023-09-30 13F CENTURY ALUM COM 156431108 19,080 19,080 137 0.0051
2023-02-14 2022-12-31 13F CENTURY ALUM COM 156431108 0 -133,045 -100.00 0 -100.00
2022-11-14 2022-09-30 13F CENTURY ALUM COM 156431108 133,045 -7,677 -5.46 702 -32.30 0.0437
2022-08-15 2022-06-30 13F CENTURY ALUM COM 156431108 140,722 37,618 36.49 1,037 -61.78 0.0380
2022-05-16 2022-03-31 13F CENTURY ALUM COM 156431108 103,104 103,104 2,713 0.1062
2021-05-17 2021-03-31 13F CENTURY ALUM COM 156431108 0 -32,079 -100.00 0 -100.00
2021-02-16 2020-12-31 13F CENTURY ALUM COM 156431108 32,079 32,079 354 0.0153
2020-11-16 2020-09-30 13F CENTURY ALUM COM 156431108 0 -35,400 -100.00 0 -100.00
2020-08-17 2020-06-30 13F CENTURY ALUM COM 156431108 35,400 35,400 252 0.0128
2019-08-14 2019-06-30 13F CENTURY ALUM COM 156431108 0 -205,898 -100.00 0 -100.00
2019-05-15 2019-03-31 13F CENTURY ALUM COM 156431108 205,898 205,898 1,828 0.1107
2018-11-01 2018-09-30 13F CENTURY ALUM COM 156431108 0 -12,500 -100.00 0 -100.00
2018-08-03 2018-06-30 13F CENTURY ALUM COM 156431108 12,500 12,500 197 0.0154
2018-02-01 2017-12-31 13F CENTURY ALUM COM 156431108 0 -108,935 -100.00 0 -100.00
2017-11-13 2017-09-30 13F CENTURY ALUM COM 156431108 108,935 108,935 1,806 0.1520
2017-08-10 2017-06-30 13F CENTURY ALUM COM 156431108 0 -234,825 -100.00 0 -100.00
2017-05-05 2017-03-31 13F CENTURY ALUM COM 156431108 234,825 160,622 216.46 2,980 369.29 0.2959
2017-02-10 2016-12-31 13F CENTURY ALUM COM 156431108 74,203 74,203 635 0.0681
2015-11-16 2015-09-30 13F CENTURY ALUM COM 156431108 0 -11,709 -100.00 0 -100.00
2015-08-14 2015-06-30 13F CENTURY ALUM COM 156431108 11,709 -42,838 -78.53 122 -83.80 0.0119
2015-05-15 2015-03-31 13F CENTURY ALUM COM 156431108 54,547 54,547 753 0.1001
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.