Momentum Trading

Momentum trading is a strategy that buys securities that have been rising strongly and sells or avoids those that have been falling. The core idea is that winners tend to keep winning and losers tend to keep losing over short to medium-term periods. Momentum traders follow the “trend is your friend” principle and ride the wave of existing price movement.

What Is Momentum Trading?

Momentum is the tendency of securities to continue moving in the direction of their recent trend. Research has consistently shown that stocks with strong recent returns (typically over the past 3 to 12 months) outperform stocks with weak recent returns over the following 1 to 6 months. This is called the price momentum anomaly.

Momentum trading translates this research into a practical trading strategy.

How Momentum Is Measured

**Absolute momentum (time-series momentum)**: compare a security’s return over the past 6 or 12 months. If positive, it has upward momentum; if negative, downward.

**Relative momentum (cross-sectional momentum)**: rank all securities by recent return. Buy the top 20% and sell or avoid the bottom 20%.

**Rate of change (ROC)**: percentage price change over a defined period.

**Relative Strength (RS)**: how a stock’s performance compares to the index or sector.

Types of Momentum Strategies

**Short-term momentum** (1 day to 1 month): related to overreaction to news; tends to reverse.

**Medium-term momentum** (3 to 12 months): the most persistent and well-documented momentum effect.

**Long-term momentum** (1 to 5 years): reversal tends to occur (long-term mean reversion).

Momentum in Indian Markets

Momentum as a factor has worked well in Indian equity markets. Several mutual fund houses in India offer momentum factor funds that systematically invest in the top-performing stocks from the Nifty 200 or similar universe.

Risks of Momentum Trading

– Momentum strategies can suffer sharp reversals during market regime changes
– Entering late in a trend can result in buying near the top
– High turnover increases transaction costs

Practical Example

In 2023, defence stocks were among the top performers in India due to increased government spending on indigenisation. A momentum trader identified the sector’s high relative strength and bought defence stocks. Over the next 6 months, the rally continued and they exited when relative strength began to weaken.

Key Takeaways

– Momentum trading buys strong recent performers and avoids or shorts recent underperformers
– Medium-term momentum (3 to 12 months) is the most documented and reliable momentum signal
– Momentum factor mutual funds offer systematic exposure to momentum in Indian markets
– Sharp reversals during market regime changes are the primary risk for momentum strategies
– Momentum works best when combined with risk management rules to limit drawdown during reversals