Sorry, I couldn't find pricing data for that day. The closing price for Mastercard (MA) on December 31, 2018 was $181.38. It was up 0.9% for the day. The latest price is $536.93.
DATE
OPEN
HIGH
LOW
CLOSE
VOLUME
December 31 2018
$179.72
$181.72
$179.18
$181.38
3,658,494
Daily pricing data for Mastercard dates back to 5/25/2006, and may be incomplete.