The closing price for the S&P 500 (GSPC) on December 31, 2019 was $3,230.78. It was up 0.5% for the day (up 0.3% from previous close). The latest price is $6,457.85.
DATE
OPEN
HIGH
LOW
CLOSE
VOLUME
December 31 2019
$3,215.18
$3,231.72
$3,212.03
$3,230.78
2,894,760,000
Daily pricing data for the S&P 500 dates back to 12/30/1927, and may be incomplete.