Cross Sectional Momentum
Cross Sectional Momentum — Relative ranking momentum across a universe.
Definition
Cross Sectional Momentum refers to relative ranking momentum across a universe. Keep that definition fixed when comparing series, managers, or regimes — renaming the same tape does not create a new signal.
Why it matters
It shows up in factor research, attribution, and capacity debates — whether a return slice is skill, style, or fee drag. When relative ranking momentum across a universe shifts, related hedges, limits, and narratives usually need an explicit update rather than a quiet assumption.
Case
Suppose a desk is positioned for the opposite of what cross sectional momentum is saying. If relative ranking momentum across a universe moves against that book, the first question is not “is the story clever?” but whether size, hedges, and stop logic still match the observation.
How to read it
Check definition stability across universes, costs, and regimes before treating a backtest as portable. Prefer a short written null hypothesis for Cross Sectional Momentum: what would falsify the current reading in the next window?