Quest Diagnostics (NYSE: DGX ) is a provider of medical diagnostic services to markets across the world. Operations are focused on North America, where DGX has more than 2,000 locations. DGX has extensive coverage over the USBuildingBenjamins is a free stock picking and market commentary investment newsletter. Building Benjamins is the DBA (doing businesses as) publishing entity for Tradition Investment Management, LLC, a registered investment adviser. Benjamin Halliburton, our founder, also founded Traditi ...