Based on 98 years of S&P 500 data (through 2026), daily performance trends typically follow these patterns: Average Return : -0.07%. Trend : Over 51% of Mondays since 1928 have finished lower.
Historically, is considered the best day to buy stocks and the worst day to sell them due to the "Monday Effect," which typically sees prices dip at the start of the week. Conversely, Wednesday and Friday are often cited as the best days for performance, with Wednesday yielding the highest average returns and Friday seeing the highest probability of a positive close. Performance Summary by Day best and worst day of the week to buy stock
: Many experts from Chase suggest that dollar-cost averaging (DCA) —investing the same amount regularly regardless of the day—is more effective for long-term growth than trying to time daily volatility. Based on 98 years of S&P 500 data
While these historical patterns exist, modern research and platforms like Investopedia and Yahoo Finance suggest several caveats: Conversely, Wednesday and Friday are often cited as