OSI Group | 22,122 followers on LinkedIn. OSI is the premier global supplier of custom value-added food products to the world’s leading foodservice and retail food brands. As one of the largest privately held companies in the United States, we offer unparalleled resources and reach. The extensive capabilities of OSI, including custom food product development and global food supply chain management from sourcing through processing and distribution, allow us to deliver custom food products that fit your operation and maximize your opportunity.