Form S-I Table of Conies& We rely upon a limited number of contract manufacturers to provide a significant portion of our supply of produds. There is limited available manufacturing capacity that meets our quality standards. Our current plans to meet expected production needs rely in large part on the successful ramping up of operations at our Heartland facility in Joplin, Missouri. See "—Risks Related to Our Business and Industry—We may not successfully ramp up operations at our Heartland facility or our Heartland facility may not operate in accordance with our expectations." We have agreements with a network of contract manufacturers that require them to provide us with specific finished products. Most of our agreements with our contract manufacturers expire in 2015 and will thereafter be automatically renewed for consecutive one-year terms until notice of non-renewal is given. Upon expiration of our existing agreements with these contract manufacturers, we may not be able to renegotiate the terms of our agreements with these contract manufacturers on a commercially reasonable basis, or at all. During the years ended December 31, 2012, 2013 and 2014 and the three months ended March 31, 2015, approximately 73%, 69%, 68% and 54% of our cost of sales, respectively. was derived from products purchase-xi from the Company's five largest contract manufacturers. We manufacture ow canned wet foods at two different locations owned by a single contract manufacturer and certain of our treats and cat litter products arc also manufactured by single-source contract manufacturers. The manufacture of our products may not be easily transferable to other sites in the event that any of our contract manufacturers experience breakdown, failure or substandard performance of equipment. disruption of supply or shortages of raw materials and other supplies, labor problems. power outages, adverse weather conditions and natural disasters or the need to comply with environmen