Mean Reversion & Momentum on the CMT Exam
Every market movement can be classified as either momentum (trend continuation) or mean reversion (return to average). Understanding when each regime dominates is essential for CMT Level 2 and Level 3.
For the full guide, see the CMT Exam Guide 2026.
Momentum Strategies
Momentum is the tendency of assets that have performed well to continue performing well (and vice versa):
Theory
- Grounded in behavioral finance: herding, anchoring, slow information diffusion
- Dow Theory Tenet #6: "A trend persists until definitively reversed"
- Academic evidence: Jegadeesh & Titman (1993) demonstrated 3–12 month momentum premium
Key Momentum Indicators
- Moving average crossovers (50/200-day)
- MACD signals
- Rate of Change (ROC)
- Relative strength rankings
- ADX above 25 confirms trending regime
Momentum System Characteristics
| Feature | Typical Value |
|---|---|
| Win rate | 35–45% |
| Reward/risk ratio | 2:1 to 4:1 |
| Profit factor | 1.5–2.5 |
| Best market regime | Trending |
| Holding period | Weeks to months |
Mean Reversion Strategies
Mean reversion assumes prices deviate from a central tendency and return:
Theory
- Statistical analysis: prices oscillate around means
- Markets are range-bound ~70% of the time
- Bollinger Bands capture this behavior mathematically
Key Mean-Reversion Indicators
- RSI oversold (<30) / overbought (>70)
- Bollinger Band %b extremes
- Stochastic oscillator extremes
- Z-score of price vs. moving average
- VIX extremes (mean-reverting)
Mean Reversion System Characteristics
| Feature | Typical Value |
|---|---|
| Win rate | 60–75% |
| Reward/risk ratio | 0.5:1 to 1:1 |
| Profit factor | 1.3–2.0 |
| Best market regime | Range-bound |
| Holding period | Days to weeks |
Regime Detection
Knowing when to use each strategy is the critical skill:
| Signal | Trending (Momentum) | Range-Bound (Mean Reversion) |
|---|---|---|
| ADX | > 25 | < 20 |
| Bollinger Band width | Expanding | Contracting |
| ATR | Rising | Flat/declining |
| Moving averages | Fanning apart | Intertwined |
| Volume | Directional surges | Mixed/declining |
The Momentum Crash Risk
Momentum strategies are vulnerable to sudden reversals ("momentum crashes"):
- 2009, 2020 saw extreme momentum crashes
- Risk management and position sizing are essential
- Diversifying across both strategies reduces portfolio volatility
CMT Exam Application
- Level 2: Identify regimes, select appropriate indicators, understand backtesting results
- Level 3: Compare strategies in essays, integrate into portfolio management decisions
Practice strategy questions in our test bank. Full guide: CMT Exam 2026.
Momentum vs. Mean Reversion — Cumulative Returns by Market Regime
Momentum thrives in trending markets; mean reversion in range-bound markets
Strategy Characteristics — Momentum vs. Mean Reversion
Comparative scores across key performance dimensions (1–10 scale)