Momentum Trading: Riding the Trend

Momentum is one of the most well-documented anomalies in finance. Research by Jegadeesh and Titman (1993) showed that stocks that performed well over the past 3-12 months tend to continue performing well, and vice versa. This effect has been confirmed across virtually every market in the world, including India.

What Is Momentum Trading?

At its core, momentum trading is simple: buy what's going up, sell what's going down. The assumption is that trends tend to persist — a stock that has been rising is more likely to continue rising than to reverse.

Why it works:

• Behavioral finance: Investors underreact to new information initially, then overreact as the trend becomes obvious
• Herding: As more traders notice a trend, they pile in, extending it further
• Fundamental momentum: Improving earnings and fundamentals drive sustained price increases

Measuring Momentum

Rate of Change (ROC)

ROC = (Current Price - Price N periods ago) / Price N periods ago × 100

A 20-day ROC of 5% means the stock has risen 5% in the last 20 trading days.

Relative Strength

Compare a stock's performance against a benchmark (Nifty 50) or against other stocks in its sector. Buy stocks showing stronger relative performance.

Moving Average Slope

The slope of a moving average quantifies trend strength. A steeply rising 50-day SMA indicates strong upward momentum.

A Simple Momentum Strategy

1. Calculate 12-month returns for all Nifty 200 stocks
2. Rank stocks by return (highest to lowest)
3. Buy the top 10 stocks (strongest momentum)
4. Rebalance monthly — sell stocks that drop out of top 10, buy new entries
5. Apply the 1-2% risk rule to each position

Momentum in Indian Markets

Momentum has worked exceptionally well in Indian markets. Research shows:

• The top decile of Nifty 500 stocks by 12-month momentum has outperformed the bottom decile by 15-20% annually
• The effect is strongest in mid-cap and small-cap stocks
• Momentum crashes during sharp market reversals (March 2020, for example)

Key Takeaways

• Momentum is one of the best-documented return anomalies in finance
• Simple momentum strategies (buy the top performers) have strong historical returns
• Use 3-12 month lookback periods for ranking — shorter is noisier, longer is slower
• Always combine with risk management — momentum crashes can be severe
• Indian markets show particularly strong momentum effects

Conclusion

Momentum is real, persistent, and profitable — but it's not free money. Momentum strategies suffer sharp drawdowns during market reversals. The key is combining momentum signals with proper risk management: position sizing, stop-losses, and portfolio-level drawdown limits.

This content is for educational purposes only and does not constitute investment advice.