Theory Says Don’t Sell Your Investments on Monday — Here’s Why

According to the "Monday effect" theory, investors may want to avoid selling stocks on Mondays due to the potential for continued upward momentum from Friday's gains, the delayed release of negative news over the weekend that could cause price dips, and increased market volatility typically seen on Mondays and Tuesdays, particularly in bear markets; however, not all analysts subscribe to this theory.

Analysis

The article discusses the "Monday effect," a theory suggesting that Mondays may not be optimal for selling investments, particularly stocks. One interpretation, based on Frank Cross's 1970s research, posits that positive momentum from Friday, often the S&P 500's best-performing day, can extend into Monday, making it disadvantageous to sell an appreciating asset. Conversely, another view cited by VectorVest suggests Friday is ideal for selling to capture gains before a potential Monday reversal. Key reasons to avoid selling on Monday include the possibility of prices continuing to rise from Friday's close, the impact of negative news potentially released by companies late on Friday (which could depress prices early Monday, warranting a hold until stabilization), and increased market volatility, especially in bear markets where Mondays and Tuesdays historically exhibit the largest stock declines according to J.P. Morgan Wealth Management. It is noted, however, that these theories are not universally accepted.

Key Decisions for Investors

• Investors might consider observing Friday's market performance and late-day news releases before executing sell orders on the subsequent Monday, particularly if upward momentum is evident.
• During bear market conditions, increased caution is advisable on Mondays due to potentially heightened volatility, which could lead to suboptimal selling prices.
• Given the theoretical nature and varied interpretations of the 'Monday effect,' investors should treat it as one of several potential market timing considerations rather than a standalone trading rule, integrating it with comprehensive fundamental and technical analysis.