Fusion Systems on Sylow $3$-subgroups of Fischer and Monster sporadic groups: I

Abstract

We classify all corefree fusion systems on a Sylow $3$-subgroup of the sporadic groups ${\mathrm{Fi}}_{22}$, ${\mathrm{Fi}}_{23}$ and $\mathrm{B}$. We show that the $3$-group in each case does not support any exotic fusion systems. This is the first of two papers that will complete the classification of all corefree fusion systems on Sylow $p$-subgroups of sporadic groups for $p$ odd.