The closing price for the S&P 500 (GSPC) on January 20, 1977 was $102.97. It was down 0.8% for the day (down 0.8% from previous close). The latest price is $6,643.44.
DATE
OPEN
HIGH
LOW
CLOSE
VOLUME
January 20 1977
$103.85
$104.45
$102.50
$102.97
26,520,000
Daily pricing data for the S&P 500 dates back to 12/30/1927, and may be incomplete.