Sorry, I couldn't find pricing data for that day. The closing price for the Nasdaq Composite (IXIC) on January 18, 2019 was $7,157.23. It was up 0.3% for the day.
DATE
OPEN
HIGH
LOW
CLOSE
VOLUME
January 18 2019
$7,134.10
$7,185.38
$7,096.62
$7,157.23
2,451,240,000
Daily pricing data for the Nasdaq Composite dates back to 2/5/1971, and may be incomplete.