Sorry, I couldn't find pricing data for that day. The closing price for Exxon Mobil (XOM) on December 31, 2010 was $41.49. It was down 0.1% for the day.
DATE
OPEN
HIGH
LOW
CLOSE
VOLUME
December 31 2010
$41.51
$41.71
$41.43
$41.49
15,273,700
Daily pricing data for Exxon Mobil dates back to 1/2/1962, and may be incomplete.