Stock Market Seasonality

Seasonal patterns in the stock market have persisted for decades and can improve your timing.

Major Seasonal Patterns

Sell in May and Go Away

• Historical underperformance May-October
• Better returns November-April
• Not every year but statistically significant
• Consider reducing exposure in summer

Santa Claus Rally

• Last 5 trading days + first 2 of new year
• Historically positive period
• Tax-loss selling ends
• Institutional window dressing

January Effect

• Small caps tend to outperform in January
• Tax-loss selling rebound
• New year allocation
• Less reliable in recent years

September Effect

• Historically weakest month
• Post-summer return
• Mutual fund fiscal year-end selling
• Increased volatility

Weekly Patterns

Monday Effect

• Historically weaker Mondays
• Weekend news digestion
• Less reliable now

Friday Strength

• Often positive before weekends
• Position squaring
• Short covering

Monthly Patterns

Options Expiration

• Third Friday of each month
• Increased volatility
• Pin risk near strike prices
• Quadruple witching quarterly

End of Month/Quarter

• Fund rebalancing
• Window dressing
• Can create temporary moves

Earnings Seasonality

Earnings Season

• January, April, July, October
• 2-3 weeks of heavy reports
• Market direction often set by big names
• Increased individual stock volatility

How to Use Seasonality

As a Filter

• Increase exposure in favorable months
• Reduce in historically weak periods
• Not a standalone strategy
• Combine with technical analysis

What NOT to Do

• Do not trade solely on seasonality
• Macro events override patterns
• Each year is different
• Use as additional confirmation only

Key Takeaways

1. November-April historically strongest
2. September historically weakest
3. Options expiration increases volatility
4. Use as filter, not primary strategy
5. Combine with other analysis methods