Sigma Supply of North America, Proudly Part of BradyPLUS | 2,683 followers on LinkedIn. Sigma Supply of North America, Inc. is a family-owned, nationally-based distributor of Packaging Supplies, Equipment & Service, and Industrial Supplies including Material Handling, MRO, Safety Products, and JAN/SAN supplies. We provide world-class packaging solutions with the personalized service you can only get from a family-owned business. We are a certified woman-owned business – rating in the top 1% of all Women’s Business Enterprises.