GMS has North American market share of about 15% and 18% in wallboard and acoustical ceiling products distribution, respectively, the largest in a still fragmented industry. We believe the company would continue to increase its market presence and share through continued bolt-on acquisitions and organic growth. The company's leading position in many markets does result in some purchasing power over smaller peers. GMS's ability to sell large homebuilders on a national scale should also drive share of wallet gains. We expect GMS's EBITDA margins to expand (by 50 to 60 basis points) for fiscal 2019 chiefly because of synergies from the Titan acquisition coupled with increased cost efficiencies resulting from productivity initiatives. However, we believe that increased costs associated with
