Factor tilt

Factor tilt is the decomposition of a portfolio's deviation from the market along research-documented risk dimensions. Academic finance — Fama, French, Carhart, and their successors — found that returns across thousands of stocks cluster along a small set of characteristics (value, size, momentum, quality, volatility). A portfolio that overweights cheap stocks relative to the index has a value tilt; one that overweights recent winners has a momentum tilt.

A factor tilt is separate from a sector tilt. A portfolio of large US banks has a financials sector tilt; a portfolio of cheap-but-not-necessarily-banking stocks has a value factor tilt. The two can coexist or cancel.

The case for a factor tilt is that the factor carries a long-run return premium compensating for a specific risk (value is cyclically out of favor during growth regimes; momentum crashes in sharp reversals). The case against is that premia are realized over decades, not years, and tracking a factor index introduces new costs and turnover.