Sorry, I couldn't find pricing data for that day. The closing price for QQQ on December 31, 2019 was $205.60. It was up 0.5% for the day. The latest price is $468.94.
DATE
OPEN
HIGH
LOW
CLOSE
VOLUME
December 31 2019
$204.64
$205.74
$204.23
$205.60
18,201,590
Daily pricing data for QQQ dates back to 3/10/1999, and may be incomplete.