Sorry, I couldn't find pricing data for that day. The closing price for the S&P 500 (GSPC) on January 3, 2020 was $3,234.85. It was up 0.3% for the day. The latest price is $5,942.47.
DATE
OPEN
HIGH
LOW
CLOSE
VOLUME
January 03 2020
$3,226.36
$3,246.15
$3,222.34
$3,234.85
3,461,290,000
Daily pricing data for the S&P 500 dates back to 12/30/1927, and may be incomplete.