The opening price for the S&P 500 (GSPC) on March 2, 2018 was $2,658.89. It was up 1.2% for the day (up 0.5% from previous close). The latest price is $6,449.80.
DATE
OPEN
HIGH
LOW
CLOSE
VOLUME
March 02 2018
$2,658.89
$2,696.25
$2,647.32
$2,691.25
3,891,250,000
Daily pricing data for the S&P 500 dates back to 12/30/1927, and may be incomplete.