Envision Healthcare, which is owned by Clayton, Dubilier & Rice, has filed to raise up to $100 million in an IPO. The company has applied to list on the NYSE under the symbol EVH. Based in Colorado, Envision provides physician-led, outsourced medical services in the U.S. with more than 20,000 affiliated clinicians. The company markets its services primarily under its EmCare and AMR brands. CD&R acquired the company in 2011 in a deal valued at $3.2 billion. The firm will retain a controlling position in the company following the offering.