Sorry, I couldn't find pricing data for that day. The closing price for Microsoft (MSFT) on December 31, 2018 was $95.10. It was up 0.3% for the day. The latest price is $510.18.
DATE
OPEN
HIGH
LOW
CLOSE
VOLUME
December 31 2018
$94.84
$95.88
$94.04
$95.10
33,173,800
Daily pricing data for Microsoft dates back to 3/13/1986, and may be incomplete.