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+6.79%Monday cumulative return
Weekday study
Monday leads this view
Summary
Total return by weekday
Monday+6.79% total · +0.14% avg
Cumulative
Weekday-return line chart
Monday · Oct 12, 2026+6.79% cumulative
MondayTuesdayWednesdayThursdayFriday
Monday+6.79%+0.14% avg · +60.42% wins · 48 daysBest +1.44% · Worst -0.93%
Tuesday+3.08%+0.06% avg · +50.00% wins · 52 daysBest +2.07% · Worst -1.00%
Wednesday-5.38%-0.10% avg · +47.17% wins · 53 daysBest +0.97% · Worst -1.39%
Thursday-3.38%-0.07% avg · +46.00% wins · 50 daysBest +1.46% · Worst -2.96%
Friday+2.85%+0.06% avg · +61.22% wins · 49 daysBest +1.70% · Worst -2.04%
Source freshness
This view covers Oct 15, 2025 through Oct 15, 2026. The source contains 8,505 SPX daily rows.
Source fetched from Yahoo Finance SPX chart; last successful refresh Oct 16, 2026, 4:48 AM UTC.