  We study supersymmetric AdS$_6$ black holes at large angular momenta, from
the index of 5d SCFTs on $S^4\times\mathbb{R}$ in the large $N$ and Cardy
limit. Our examples are the strong coupling limits of 5d gauge theories on the
D4-D8-O8 system. The large $N$ free energy scales like $N^{5/2}$, statistically
accounting for the entropy of large black holes in AdS$_6$. Instanton solitons
play subtle roles to realize these deconfined degrees of freedom.
