what is a s and p ptp index participation rate

The closing price for the S&P 500 (GSPC) yesterday was $6,740.13. It was down 0.9% for the day (down 0.9% from previous close).

DATEOPENHIGHLOWCLOSEVOLUME
December 17 2025 19:30
$6,733.36
$6,741.45
$6,730.75
$6,740.13
144,345,000
December 17 2025 18:30
$6,742.59
$6,744.72
$6,729.19
$6,733.41
281,440,000
December 17 2025 17:30
$6,750.24
$6,758.66
$6,739.05
$6,742.77
248,187,000
December 17 2025 16:30
$6,755.05
$6,758.84
$6,739.50
$6,750.20
300,394,000
December 17 2025 15:30
$6,798.36
$6,800.20
$6,742.51
$6,755.66
440,084,559
December 17 2025 14:30
$6,802.88
$6,812.26
$6,784.69
$6,798.42
488,003,483
Daily pricing data for the S&P 500 dates back to 12/30/1927, and may be incomplete.