Over the course of its aggressive nationwide expansion, O'Reilly Auto Parts has successfully acquired and integrated numerous regional automotive parts chains to solidify its status as a market leader. Notable corporate buyouts include major acquisitions like CSK Auto (which brought Checker, Schuck's, and Kragen stores under the O'Reilly umbrella), Mid-State Automotive Distributors, VIP Auto Parts, and several other smaller regional supplier networks across the United States.