The disclosure provides crystalline Sovaprevir forms. The crystalline forms of Sovaprevir comprise a Form A polymorph, a Form B polymorph, a Form C polymorph, a Form D polymorph, and a Form E polymorph. The Form A, B, C, D, and E polymorphs exhibit X-ray powder diffraction patterns having peak locations in accordance with Figs. 1, 4, 7, 10, and 13, respectively.