We estimate investable comoment equity risk premiums for the US markets. The stock's
contribution to the asymmetry and the fat tails of the market portfolio's payoff are priced into a
coskewness premium and a cokurtosis premium. We construct zero-investment strategies that
are long and short in coskewness and cokurtosis equity risks; we infer from the spread the
returns attached to a unit exposure to US equity coskewness and cokurtosis. The coskewness
and cokurtosis premiums present positive monthly average returns of 0.27% and 0.14% from
January 1959 to December 2011. Comoment risks appear to be significantly priced within the
US stock market and display significant explanatory power regarding the US size and
book-to-market effects. The premiums do not subsume, but rather complement the empirical
capital asset pricing model. Our analysis relies on data collected from CRSP (Chicago Research
Center for Security Prices) over December 1955 to December 2011. To our knowledge, the
paper is the first to propose investable higher-moment risk factors over such an extensive time
period.