DGX vs MGA Comparison

Quest Diagnostics is a leading independent provider of diagnostic testing, information, and services in the US. The company generates over 97% of its revenue through clinical testing, anatomic pathology, esoteric testing, and substance abuse testing with specimens collected at its national network of roughly 2,400 patient service centers, as well as multiple doctors offices and hospitals. The firm also runs a much smaller diagnostic solutions segment that provides clinical trials testing, risk-assessment services, and information technology solutions.

Magna International prides itself on an entrepreneurial culture and a corporate constitution that outlines the distribution of profits to various stakeholders. This automotive supplier's product groups include exteriors, interiors, seating, roof systems, body and chassis, powertrain, vision and electronic systems, closure systems, electric vehicle systems, tooling and engineering, and contract vehicle assembly. In 2025, 48.6% of Magna's USD 42 billion of revenue came from North America, while Europe accounted for approximately 38% and Asia the remainder. The firm's top six customers constituted 75.9% of revenue, with the top three being GM, Mercedes, and Ford. GM was the largest contributor at 15.6%. Magna was founded in 1957, has about 144,000 employees, and is based in Aurora, Ontario.