Sorry, I couldn't find pricing data for that day. The closing price for Tesla (TSLA) on December 31, 2018 was $22.19. It was down 1.5% for the day. The latest price is $444.59.
DATE
OPEN
HIGH
LOW
CLOSE
VOLUME
December 31 2018
$22.52
$22.61
$21.68
$22.19
94,535,152
Daily pricing data for Tesla dates back to 6/29/2010, and may be incomplete.