The growth of high-quality, sputter-deposited epitaxial PtMnSb(001) on W(001)/MgO(001) is described. X-ray diffraction results indicate that PtMnSb grows unrotated on the W seed layer with a modest in-plane tensile strain. Polar magneto-optic Kerr effect measurements show a peak rotation of 1.02° at 575 nm. In-plane magnetization is observed, indicating that the level of strain in the film is insufficient to induce perpendicular magnetization.