  In this paper, we prove the Chow ring and augmented Chow ring of a matroid is
equivariant $\gamma$-positivity under the action of any group of automorphisms
of the matroid. This verifies a conjecture of Angarone, Nathanson, and Reiner.
Our method gives an explicit interpretation to the coefficients of the
equivariant $\gamma$-expansion. Applying our theorem to uniform matroids, we
extend and recover several known results regarding uniform matroids and
Eulerian quasisymmetric functions. Using these results, we are able to answer a
problem proposed by Athanasiadis about extending the $\gamma$-expansion of the
binomial Eulerian polynomial.
