 GPO Plus graduates to a premium market and begins trading on March 2, 2021 LAS VEGAS, NV, March 2, 2021 OTC PR WIRE GPO Plus, Inc. OTCQB: GPOX, a diversified corporation operating industry specific Group Purchasing Organizations GPOs, is thrilled to announce its successful upgrade to the OTCQB Venture Market OTCQB. GPO ... 