DALLAS & SAN DIEGO–(BUSINESS WIRE)–AMN Healthcare (NYSE: AMN) has again been named as the largest healthcare staffing company in the country, marking 14 years at the top of the industry rankings by Staffing Industry Analysts (SIA). AMN Healthcare retained its top ranking among healthcare staffing companies with a 12% overall market share, according to SIA estimates of 2019 annual revenue. AMN Healthcare is the largest travel nursing company, with a 17% market share, and largest in allied heal