sandp500 standard deviation

The closing price for the S&P 500 (GSPC) yesterday was $6,822.32.

DATEOPENHIGHLOWCLOSE
October 30 2025 20:00
$6,822.32
$6,822.32
$6,822.32
$6,822.32
Daily pricing data for the S&P 500 dates back to 12/30/1927, and may be incomplete.