Sorry, I couldn't find pricing data for that day. The closing price for American Express (AXP) on December 31, 2018 was $86.77. It was up 0.2% for the day. The latest price is $341.29.
DATE
OPEN
HIGH
LOW
CLOSE
VOLUME
December 31 2018
$86.59
$87.03
$85.84
$86.77
2,821,100
Daily pricing data for American Express dates back to 6/1/1972, and may be incomplete.