Momentum
Persistence of the recent price trend.
Momentum is the tendency of prices to persist in their recent direction: stocks that have performed well over the past 3–12 months tend on average to continue performing well in the near term, and those that have performed poorly tend to continue underperforming. It is one of the most robust and well-documented effects in empirical finance, identified across dozens of markets and asset classes.
Momentum is also one of the psychologically hardest effects to exploit: it requires buying stocks that have already risen (against the instinct to hunt for 'bargains') and selling stocks that have already fallen (against the instinct to wait for recovery). Professional momentum funds suffer periodic sharp drawdowns — so-called 'momentum crashes' — which typically occur during rapid market reversals.
Worked example
Nvidia (NVDA) from Q2 2023 through Q1 2025 was an extreme momentum stock: among the top 5 performers in the S&P 500 for nine consecutive quarters. The momentum factor measured over the trailing 12 months exceeded 200% during that period. An investor following a momentum signal would have continued to hold NVDA even when it appeared 'expensive' on fundamental multiples.
The 52-week range and volume are complementary signals to momentum: a stock that repeatedly breaks annual highs on rising volume has solid technical momentum. Lucex displays relative momentum (performance versus the reference index) on each position.
When it's used
Momentum is used primarily in two contexts. First, portfolio screening: 'which stocks have had the best relative performance over the past 6 months?' is one of the most common filters in quantitative models. Second, managing entry timing: a stock with excellent fundamentals but negative momentum (deteriorating technical trend) may be worth waiting for a reversal signal before buying. Momentum does not replace fundamental analysis — it helps calibrate timing.
Limits
Momentum works 'on average' across many stocks, not on every single one. A strongly trending stock can reverse sharply on a negative news event — momentum does not predict shocks. Momentum also tends to deteriorate precisely when the market is most frantic: in extreme rallies, momentum stocks are often the most vulnerable to sudden drops. The look-back period matters: 3-month and 12-month momentum can give opposite signals on the same stock.
Frequently asked
Are momentum and trend following the same thing?
Conceptually similar, technically distinct. Trend following uses moving averages or breakouts to track price direction. Momentum uses relative performance versus other stocks or the index over the same period. Both rely on the persistence of moves, but momentum is primarily cross-sectional (compares stocks against each other), while trend following is primarily time-series (compares a stock against its own past).
Does momentum work in bear markets?
Less well. In rapid, deep bear markets (like February–March 2020) momentum crashes violently: the best-performing stocks are sold first to cover losses elsewhere. In slowly declining markets (2022) momentum tends to work better because the deterioration is gradual.
Over what time horizon is momentum measured?
Academic literature typically uses 12 months minus the most recent month (the '12-1' window): the last month is excluded to avoid short-term mean reversion. In retail practice, 3, 6, and 12-month periods are most commonly used. Horizons below 4 weeks are generally considered mean-reverting, not momentum-driven.
Related terms
Educational definition. Not financial advice.