Sorry, I couldn't find pricing data for that day. The closing price for QQQ on December 31, 2019 was $205.13. It was up 0.5% for the day. The latest price is $627.14.
DATE
OPEN
HIGH
LOW
CLOSE
VOLUME
December 31 2019
$204.17
$205.27
$203.77
$205.13
18,201,590
Daily pricing data for QQQ dates back to 3/10/1999, and may be incomplete.