Sorry, I couldn't find pricing data for that day. The closing price for Apple (AAPL) on August 21, 2009 was $5.08. It was up 0.9% for the day. The latest price is $245.27.
DATE
OPEN
HIGH
LOW
CLOSE
VOLUME
August 21 2009
$5.03
$5.08
$5.01
$5.08
416,074,400
Daily pricing data for Apple dates back to 12/12/1980, and may be incomplete.