Century Aluminum (CENX) is up a dime to $11.49 and options volume is 3X the average daily. Most of the volume is on the call side of the options chain after an investor: bought 6,200 Mar 10 calls for $4.15, bought 5,000 Sep 7 calls for $4.70 and sold 11K Jan2011 10 calls for $4.90. The spread might close out positions in Mar and Sep while opening a similar position (short calls) in January 2011s.