Whelan Security: Top 150 2017: No. 97 Whelan Security

2016 revenue: $204.1 million +12% W helan Security, a security staffing firm headquartered in St. Louis, increased its revenue about 12 percent year-over-year, according to President and CEO Greg Twardowski. The company offers professional security services across many industries including corporate headquarters, commercial real estate properties, financial institutions, educational campuses, health care facilities, manufacturing and industrial facilities, retail shopping centers, residential...