CENTURY ALUMINUM COMPANY (CENX) Stock Institutional Trading Activity


CENTURY ALUMINUM COMPANY (CENX) position changes reported by tracked institutional filers across multiple SEC 13F reporting periods. Based on recent SEC 13F filings (Q4 2025), investors with some of the largest reported share count changes include Renaissance Technologies LLC, First Eagle U.S. Value, and Donald Smith & Co.. Explore insights into buying and selling patterns, position changes, and investment conviction levels to understand institutional trading behavior and market dynamics.

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Portfolio quarterNameTypeQuantityRemainingReported stock balance
Q4 2021First Eagle U.S. ValueBuy29,69645,296$750
Q3 2021First Eagle U.S. ValueBuy15,60015,600$210
Q1 2021Renaissance Technologies LLCSell-285,75420,878$369
Q4 2020Renaissance Technologies LLCSell-193,422306,632$3,382
Q3 2020Renaissance Technologies LLCBuy226,499500,054$3,560
Q2 2020Renaissance Technologies LLCSell-31,444273,555$1,950
Q4 2019Renaissance Technologies LLCBuy242,999304,999$2,292
Q2 2019Renaissance Technologies LLCSell-89,49962,000$428
Q1 2019Renaissance Technologies LLCBuy139,199151,499$1,345
Q3 2018Renaissance Technologies LLCSell-151,69912,300$147
Q1 2017Renaissance Technologies LLCSell-67,267163,999$2,081
Q4 2016Renaissance Technologies LLCSell-5,933231,266$1,980
Q3 2016Renaissance Technologies LLCBuy192,500237,199$1,649
Q2 2016Renaissance Technologies LLCSell-1,043,90044,699$283
Q1 2016Renaissance Technologies LLCBuy859,9001,088,599$7,675
Q4 2015Renaissance Technologies LLCSell-339,522228,699$1,011
Q3 2015Renaissance Technologies LLCBuy393,676568,221$2,614
Q2 2015Renaissance Technologies LLCSell-91,954174,545$1,821
Q3 2014Renaissance Technologies LLCBuy266,499266,499$6,921
Q4 2013Donald Smith & Co.Sell-134,825218,992$2,291
Q3 2013Donald Smith & Co.Sell-273,467353,817$2,841
Q2 2013Donald Smith & Co.Buy627,284627,284$5,821

Frequently asked questions about CENX activity

  • Which institutional owners are buying CENX?

    Institutional owners buying CENX include investors who have either initiated new positions or increased their existing holdings based on recent SEC 13F filings. The activity table above highlights which funds added shares in the latest reporting periods and how their positions changed over time.

  • What does "buy" mean in CENX activity?

    "Buy" means an investor increased their reported position in CENX compared to the prior reporting period. This reflects growing exposure to CENTURY ALUMINUM COMPANY (CENX) rather than necessarily a brand-new position (though new positions also appear as buys when prior quantity was zero).

  • Is institutional interest in CENX increasing?

    Institutional interest in CENX can be assessed by comparing the number of tracked funds adding or increasing positions versus those trimming or exiting across the periods shown. A higher number of additions typically signals increasing participation among large filers, but it should be read alongside position sizes and the full table.