Research dashboard
SPX weekday performance
Compare S&P 500 weekday returns across intraday and close-to-close methods using the validated SPX dataset committed with this site.
1Y · Open to close+7.08%Monday cumulative return
Weekday study
Monday leads this view
Summary
Total return by weekday
Monday+7.08% total · +0.14% avg
Cumulative
Weekday-return line chart
Monday · Aug 31, 2026+7.08% cumulative
MondayTuesdayWednesdayThursdayFriday
Monday+7.08%+0.14% avg · +61.22% wins · 49 daysBest +1.44% · Worst -0.93%
Tuesday+4.48%+0.09% avg · +53.85% wins · 52 daysBest +2.07% · Worst -1.00%
Wednesday-2.78%-0.05% avg · +50.00% wins · 52 daysBest +0.97% · Worst -1.39%
Thursday-4.59%-0.09% avg · +44.90% wins · 49 daysBest +1.46% · Worst -2.96%
Friday-0.43%-0.01% avg · +60.42% wins · 48 daysBest +1.70% · Worst -2.79%
Source freshness
This view covers Sep 2, 2025 through Aug 31, 2026. The source contains 8,472 SPX daily rows.
Source fetched from Yahoo Finance SPX chart; last successful refresh Sep 1, 2026, 5:26 AM UTC.