Sumo Heavy puts it to brick and mortar on South St. in Philly, hiring programmers, project managers By Sue Spolan on February 16, 2012 Sumo moves. Last time we checked in, Sumo Heavy Industries was operating as a virtual company. The eCommerce design, development and consulting firm takes that whole location, location, location thing very seriously and is now at Fourth and South. Share Tweet Share via email Region(s): Categories Features, News ↑ Top