Sorry, I couldn't find pricing data for that day. The closing price for Costco Wholesale (COST) on December 31, 2015 was $136.45. It was down 0.4% for the day. The latest price is $1,064.04.
DATE
OPEN
HIGH
LOW
CLOSE
VOLUME
December 31 2015
$136.94
$138.56
$136.45
$136.45
1,873,399
Daily pricing data for Costco Wholesale dates back to 11/27/1985, and may be incomplete.