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Trend-following

Trend-following is a systematic strategy of buying stocks or assets in established uptrends and selling those in downtrends, based on the observation that price trends tend to persist. It can be applied at multiple time horizons — from weeks to years — and is both a trading method and a longer-term investment approach.

For mean reversion (the opposite), see mean-reversion investing. For discretionary momentum, see momentum investing. For systematic momentum factor, see momentum-factor.

How trend-following works

A trend-following system:

  1. Defines trend. Uses a rule like “price above 50-day moving average = uptrend” or “20-period breakout above recent resistance.”
  2. Enters on trend signal. Buys when a stock enters a defined uptrend, confirming the entry with volume or momentum.
  3. Holds and trails. Maintains the position as long as the trend persists, often using a trailing stop (e.g., “sell if price closes below 10-day moving average”).
  4. Exits on trend break. Liquidates when the trend reverses (price drops below the moving average or support level).

Example: Buy Tech Stock when it breaks above 200-day moving average, confirming an established uptrend. Hold as long as it stays above the 50-day moving average. Exit if the price closes below the 50-day moving average.

Academic and empirical evidence document that trends do persist, at least in the medium term (months). Theories include:

  1. Slow information diffusion. Markets take time to absorb information; once a trend starts, momentum carries it forward.
  2. Behavioral inertia. Investors are slow to change direction; once committed to a trend, they stick with it.
  3. Trend-following itself. As more investors follow trends, mechanical buying accelerates moves, creating self-fulfilling trends.
  4. Volatility clustering. High-volatility periods produce trends; low-volatility periods do not.

Advantages

  • Systematic and rules-based. No discretion; just follow the rules.
  • Works across asset classes. Trends exist in stocks, bonds, commodities, and currencies.
  • Reduces timing risk. By following trends, you avoid trying to pick turning points.
  • Can work in bull and bear markets. Trend-following can go short (sell short) in downtrends.

Disadvantages

  1. Whipsaws in choppy markets. In sideways, trendless markets, trend-following generates many small losses (entries and exits at the wrong times).
  2. Turns are missed. By waiting for confirmation of a trend, you miss the initial move. A stock that rallies 15% before the trend is confirmed means you catch only the last 8%.
  3. Drawdowns on reversals. When a trend reverses sharply, trailing stops are executed near the peak, locking in losses just as the reversal accelerates.
  4. Time-lag risk. The lagging nature of moving averages means exits are slow. A rapid crash may exit at lower prices than the initial reversal.

See also

Wider context