Century Aluminum Company
US ˙ NasdaqGS ˙ US1564311082

SecurityCENX / Century Aluminum Company
InstitutionNatixis
Latest Disclosed Ownership0 shares
Latest Disclosed Value $ 0
Natixis closes position in CENX / Century Aluminum Company

On May 14, 2026 - Natixis filed a 13F-HR form disclosing ownership of 0 shares of Century Aluminum Company (US:CENX) valued at $0 USD as of March 31, 2026. The entity filed a previous 13F-HR on February 13, 2026 disclosing 28,076 shares of Century Aluminum Company. The current value of the position is $0 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)
2026-05-14 2026-03-31 13F CENTURY ALUM COM 156431108 0 -100.00 0
2026-02-13 2025-12-31 13F CENTURY ALUM COM 156431108 28,076 28,076 1,100 0.0039
2024-11-13 2024-09-30 13F CENTURY ALUM COM 156431108 0 -4,444 -100.00 0 -100.00
2024-08-13 2024-06-30 13F CENTURY ALUM COM 156431108 4,444 4,444 74 0.0004
2021-08-13 2021-06-30 13F CENTURY ALUM CO 156431108 0 -1,104,915 -100.00 0 -100.00
2021-05-14 2021-03-31 13F CENTURY ALUM CO 156431108 1,104,915 -238,867 -17.78 19,513 31.65 0.0638
2021-02-12 2020-12-31 13F CENTURY ALUM COM 156431108 1,343,782 974,898 264.28 14,822 464.43 0.0538
2020-11-12 2020-09-30 13F CENTURY ALUM COM 156431108 368,884 -616,116 -62.55 2,626 -62.61 0.0193
2020-08-13 2020-06-30 13F CENTURY ALUM COM 156431108 985,000 797,298 424.77 7,023 934.32 0.0545
2020-05-14 2020-03-31 13F CENTURY ALUM COM 156431108 187,702 -357,698 -65.58 679 -83.22 0.0053
2020-02-14 2019-12-31 13F CENTURY ALUM COM 156431108 545,400 -354,475 -39.39 4,047 -32.22 0.0251
2019-11-13 2019-09-30 13F CENTURY ALUM COM 156431108 899,875 -256,889 -22.21 5,971 -25.30 0.0384
2019-08-13 2019-06-30 13F CENTURY ALUM COM 156431108 1,156,764 -234,311 -16.84 7,993 -35.15 0.0632
2019-05-15 2019-03-31 13F CENTURY ALUM COM 156431108 1,391,075 420,632 43.34 12,325 73.74 0.0776
2019-02-14 2018-12-31 13F/A-1 CENTURY ALUM COM 156431108 970,443 218,669 29.09 7,094 -21.17 0.0584
2019-02-14 2018-12-31 13F CENTURY ALUM COM 156431108 970,443 218,669 7,094
2018-11-14 2018-09-30 13F CENTURY ALUM COM 156431108 751,774 227,523 43.40 8,999 8.99 0.0520
2018-08-14 2018-06-30 13F CENTURY ALUM COM 156431108 524,251 -421,912 -44.59 8,257 -47.24 0.0437
2018-05-15 2018-03-31 13F CENTURY ALUM COM 156431108 946,163 158,416 20.11 15,650 1.16 0.0961
2018-02-14 2017-12-31 13F CENTURY ALUM COM 156431108 787,747 39,461 5.27 15,471 24.70 0.1190
2017-11-14 2017-09-30 13F CENTURY ALUM COM 156431108 748,286 -381,023 -33.74 12,407 -29.49 0.1144
2017-08-14 2017-06-30 13F CENTURY ALUM COM 156431108 1,129,309 396,274 54.06 17,595 89.15 0.2000
2017-05-15 2017-03-31 13F CENTURY ALUM COM 156431108 733,035 -800,263 -52.19 9,302 -29.13 0.1159
2017-02-14 2016-12-31 13F CENTURY ALUM COM 156431108 1,533,298 -1,093,502 -41.63 13,125 -28.11 0.1352
2016-11-14 2016-09-30 13F CENTURY ALUM COM 156431108 2,626,800 0 0.00 18,256 9.79 0.2110
2016-08-15 2016-06-30 13F CENTURY ALUM COM 156431108 2,626,800 -300,000 -10.25 16,628 -19.41 0.3092
2016-05-16 2016-03-31 13F CENTURY ALUM COM 156431108 2,926,800 0 0.00 20,634 59.51 0.3463
2016-02-16 2015-12-31 13F CENTURY ALUM CO COM COM 156431108 2,926,800 0 0.00 12,936 -3.91 0.2155
2015-11-16 2015-09-30 13F CENTURY ALUM COM 156431108 2,926,800 0 0.00 13,463 -55.90 0.2813
2015-08-14 2015-06-30 13F CENTURY ALUM COM 156431108 2,926,800 0 0.00 30,527 -24.42 0.4129
2015-05-22 2015-03-31 13F CENTURY ALUM COM 156431108 2,926,800 1,000,000 51.90 40,390 -14.09 0.5551
2015-02-17 2014-12-31 13F CENTURY ALUM COM 156431108 1,926,800 0 0.00 47,014 -6.05 0.6489
2014-11-14 2014-09-30 13F CENTURY ALUM COM 156431108 1,926,800 -1,000,000 -34.17 50,039 9.04 0.7714
2014-08-14 2014-06-30 13F CENTURY ALUM COM 156431108 2,926,800 1,999,800 215.73 45,892 274.75 0.5516
2014-05-14 2014-03-31 13F CENTURY ALUM COM 156431108 927,000 -1,999,800 -68.33 12,246 -60.00 0.1594
2014-02-14 2013-12-31 13F CENTURY ALUM COM 156431108 2,926,800 0 0.00 30,614 29.94 0.2627
2013-11-14 2013-09-30 13F CENTURY ALUM COM 156431108 2,926,800 0 0.00 23,561 -13.25 0.2516
2013-08-14 2013-06-30 13F CENTURY ALUM COM 156431108 2,926,800 2,926,800 27,161 0.3881
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.