X0303 4 2010-12-31 0 0000949157 CENTURY ALUMINUM CO CENX 0001204903 BLESS MICHAEL A CENTURY ALUMINUM COMPANY 2511 GARDEN ROAD, BLDG A, SUITE 200 MONTEREY CA 93940 0 1 0 0 Exec. VP and CFO Common Stock 2010-12-31 4 F 0 1252 15.53 D 87359 D Common Stock 2011-01-01 4 F 0 14990 15.53 D 72369 D Reports shares withheld by the Issuer in connection with the vesting of performance share units granted to the Reporting Person pursuant to the Issuer's 2008-2010 Performance Share Program to satisfy tax obligations at a net settlement price equal to the closing price on Nasdaq on December 31, 2010, the vesting date. Includes unvested shares of performance share units granted to the Reporting Person in connection with the Issuer's 2009-2011 and 2010-2012 Performance Share Programs under a Rule 16b-3(d) plan, all of which vest in the ordinary course on January 1, 2011 and December 31, 2012, respectively. Reports shares withheld by the Issuer in connection with the vesting of performance share units granted to the Reporting Person pursuant to the Issuer's 2009-2011 Performance Share Program to satisfy tax obligations at a net settlement price equal to the closing price on Nasdaq on December 31, 2010, the closest trading day preceeding the vesting date as the vesting day, January 1, 2011, occurred on a day the markets were not open for trading. Includes unvested shares of performance share units granted to the Reporting Person in connection with the Issuer's 2010-2012 Performance Share Program under a Rule 16b-3(d) plan, all of which vest in the ordinary course on December 31, 2012. Jesse E. Gary, Attorney-in-Fact for Michael A. Bless 2011-01-04