Momentum

Momentum in finance refers to the tendency of securities that have performed well recently to continue performing well, and those that have performed poorly to continue underperforming, at least over medium-term horizons. It is both a measurable quantity (rate of price change) and an investment strategy (buying winners, selling losers).

Momentum is typically measured over 3, 6, or 12-month lookback periods. A common approach is to rank all stocks in a universe (e.g., Nifty 500) by their 12-month return, then buy the top quintile (highest momentum) and avoid or short the bottom quintile. Academic research, including studies on the Indian market by professors at IIM Ahmedabad and others, has shown that momentum strategies generate significant excess returns over the long term.

NSE offers momentum-based indices: the Nifty200 Momentum 30 tracks the top 30 momentum stocks from the Nifty 200 universe, rebalanced semi-annually. {{Index-fund}}s and ETFs tracking this index have become popular among Indian investors seeking systematic momentum exposure. The index has outperformed the Nifty 50 significantly over most multi-year periods.

Technical indicators related to momentum include RSI (Relative Strength Index), MACD, Rate of Change (ROC), and Stochastic Oscillator. When a stock's price is rising with increasing volume, momentum is considered strong. When price rises but momentum indicators start declining (divergence), it often signals a potential trend reversal.

The risk of momentum investing is sharp reversals — momentum crashes. When market sentiment shifts suddenly (as in March 2020 or during the 2018 NBFC crisis), former winners can collapse faster than the broader market because crowded positions unwind simultaneously. This is why momentum strategies benefit from pairing with stop-losses and combining with other factors like value or quality.