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We determine the optimal horoball packing densities for the Koszul-typeCoxeter simplex tilings in $\mathbb{H}^3$. We give a family of horoballpackings parameterized by the Busemann function and symmetry group that achievethe simplicial packing density upper bound $d_3(\infty) = \left( 2 \sqrt{3}\Lambda\left( \frac{\pi }{3} \right) \right)^{-1} \approx 0.853276$ where$\Lambda$ is the Lobachevsky function.

Optimal Horoball Packing Densities for Koszul-type tilings in Hyperbolic $3$-space