Renaissance Technologies (RenTech)'s CENX Position Overview
Renaissance Technologies (RenTech) (via Renaissance Technologies LLC (Rentech)) currently holds 117,999 shares of Century Aluminum Company (CENX) worth $4.62 M, representing 0.01% of the portfolio. First purchased in 2014-Q3, this long-term strategic position has been held for 40 quarters.
Based on 13F filings, Renaissance Technologies (RenTech) has maintained a strategic position in CENX, demonstrating sustained confidence in this investment. Largest addition occurred in Q1 2016, adding 859,900 shares. Largest reduction occurred in Q2 2016, reducing 1.04 M shares.
Analysis based on 13F filings available since 2013 Q2
Renaissance Technologies (RenTech)'s Century Aluminum Company (CENX) Holding Value Over Time
Track share changes against reported price movement
Quarterly Century Aluminum Company (CENX) Trades by Renaissance Technologies (RenTech)
| Report Date | Bought/Sold (Sh.) | % Change | Qtr. End Shares | Reported Price |
|---|---|---|---|---|
| Q4 2025 | -247,100 | Reduce 67.68% | 117,999 | $39.18 |
| Q3 2025 | +209,500 | Add 134.64% | 365,099 | $29.36 |
| Q2 2025 | +155,599 | New Buy | 155,599 | $18.02 |
| Q1 2025 | -229,699 | Sold Out | 0 | $0.00 |
| Q4 2024 | -55,000 | Reduce 19.32% | 229,699 | $18.22 |
| Q3 2024 | +25,400 | Add 9.80% | 284,699 | $16.23 |
| Q2 2024 | -59,800 | Reduce 18.74% | 259,299 | $16.75 |
| Q1 2024 | -132,800 | Reduce 29.39% | 319,099 | $15.39 |
| Q4 2023 | -162,600 | Reduce 26.46% | 451,899 | $12.14 |
| Q3 2023 | -145,100 | Reduce 19.10% | 614,499 | $7.19 |
| Q2 2023 | +58,400 | Add 8.33% | 759,599 | $0.01 |
| Q1 2023 | -336,300 | Reduce 32.41% | 701,199 | $0.01 |
| Q4 2022 | +366,400 | Add 54.60% | 1.04 M | $0.01 |
| Q3 2022 | +88,000 | Add 15.09% | 671,099 | $5.28 |
| Q2 2022 | -86,100 | Reduce 12.87% | 583,099 | $7.37 |
| Q1 2022 | +669,199 | New Buy | 669,199 | $26.31 |
| Q2 2021 | -20,878 | Sold Out | 0 | $0.00 |
| Q1 2021 | -285,754 | Reduce 93.19% | 20,878 | $17.67 |
| Q4 2020 | -193,422 | Reduce 38.68% | 306,632 | $11.03 |
| Q3 2020 | +226,499 | Add 82.80% | 500,054 | $7.12 |
| Q2 2020 | +273,555 | New Buy | 273,555 | $7.13 |
| Q1 2020 | -304,999 | Sold Out | 0 | $0.00 |
| Q4 2019 | +304,999 | New Buy | 304,999 | $7.51 |
| Q3 2019 | -62,000 | Sold Out | 0 | $0.00 |
| Q2 2019 | -89,499 | Reduce 59.08% | 62,000 | $6.90 |
| Q1 2019 | +151,499 | New Buy | 151,499 | $8.88 |
| Q4 2018 | -12,300 | Sold Out | 0 | $0.00 |
| Q3 2018 | -32,700 | Reduce 72.67% | 12,300 | $11.95 |
| Q2 2018 | +45,000 | New Buy | 45,000 | $15.76 |
| Q2 2017 | -163,999 | Sold Out | 0 | $0.00 |
| Q1 2017 | -67,267 | Reduce 29.09% | 163,999 | $12.69 |
| Q4 2016 | -5,933 | Reduce 2.50% | 231,266 | $8.56 |
| Q3 2016 | +192,500 | Add 430.66% | 237,199 | $6.95 |
| Q2 2016 | -1.04 M | Reduce 95.89% | 44,699 | $6.33 |
| Q1 2016 | +859,900 | Add 376.00% | 1.09 M | $7.05 |
| Q4 2015 | -339,522 | Reduce 59.75% | 228,699 | $4.42 |
| Q3 2015 | +393,676 | Add 225.54% | 568,221 | $4.60 |
| Q2 2015 | +174,545 | New Buy | 174,545 | $10.43 |
| Q4 2014 | -266,499 | Sold Out | 0 | $0.00 |
| Q3 2014 | +266,499 | New Buy | 266,499 | $25.97 |
Renaissance Technologies (RenTech)'s Century Aluminum Company Investment FAQs
Renaissance Technologies (RenTech) first purchased Century Aluminum Company (CENX) in Q3 2014, acquiring 266,499 shares, as reported in their 13F filing for that period. Note: Analysis reflects filings available since Q2 2013; earlier records may be incomplete.
Renaissance Technologies (RenTech) has held Century Aluminum Company (CENX) for 40 quarters since Q3 2014.
Renaissance Technologies (RenTech)'s largest addition to Century Aluminum Company (CENX) was in Q1 2016, adding 1,088,599 shares worth $7.68 M.
According to the latest 13F filing for Q4 2025, Renaissance Technologies (RenTech)'s firm, Renaissance Technologies LLC (Rentech), owns 117,999 shares of Century Aluminum Company (CENX), valued at approximately $4.62 M.
As of the Q4 2025 filing, Century Aluminum Company (CENX) represents approximately 0.01% of Renaissance Technologies (RenTech)'s publicly disclosed stock portfolio, making it one of their key holdings.
Renaissance Technologies (RenTech)'s peak holding in Century Aluminum Company (CENX) was 1,088,599 shares, as reported at the end of Q1 2016.