With headquarters in St. Louis, Missouri, Whelan Security is a privately-held, family-owned company providing contract security services across many diverse industries and vertical markets including corporate headquarters, commercial real estate properties, financial institutions, educational campuses, manufacturing & industrial facilities, retail shopping centers, residential communities, and sensitive government facilities throughout much of the United States. In addition to traditional security service, the company also offers uniformed security and staffing services to major events and provides emergency response services to natural disasters, labor disputes, plant shutdowns, and industrial accidents. Driven by an employee-centric culture and a performance based business model, the company has grown to become one of the largest security companies in the United States.