Sorry, I couldn't find pricing data for that day. The closing price for Tesla (TSLA) on May 18, 2018 was $18.45. It was down 2.8% for the day. The latest price is $426.40.
DATE
OPEN
HIGH
LOW
CLOSE
VOLUME
May 18 2018
$18.98
$18.98
$18.27
$18.45
108,778,417
Daily pricing data for Tesla dates back to 6/29/2010, and may be incomplete.