Sedex Sedex certification supplier of business ethics is the short form of the exchange of information (Supplier Ethical Data Exchange). Sedex is a network database to help companies store information on labor standards within the scope of their business, and their customers can also share this information. Today, Sedex has received a number of large retailers and manufacturers of all ages, including the Co-op ﹑ Geest, Grampian- Foods ﹑ HallmarkCards ...... Sainsbury and Tesco.