Momentum Factor Extreme (Top vs. Bottom Decile Spread)
When momentum gets stretched
When the spread between top-decile and bottom-decile momentum stocks becomes extreme (>2 standard deviations), it signals positioning crowding and elevated reversal risk. Momentum crashes (March 2009, November 2020) are violent.
What history says
Editorial commentary written by ALAN analysts. Figures cited below are analyst-authored context — they are not derived from the chart above and may reflect different windows or sources.
Momentum crashes happen when a catalyst causes crowded positions to unwind simultaneously. The March 2009 and November 2020 'value rotations' produced 20%+ moves in days.
Clients in momentum ETFs (MTUM, QMOM) should understand that the factor can experience drawdowns of 15-25% during reversals. These are features of the factor, not failures of the strategy.
When momentum is extremely stretched, it means value stocks have been punished for an extended period. Historical mean-reversion in the momentum-value spread suggests a value tilt becomes attractive.
If you hold momentum-tilted funds, size that sleeve so a factor drawdown of the 15-25% historical magnitude would not force a sale, and review whether your largest individual winners are quietly doubling the same crowded bet.