Castlight Health, the leading provider of health care transparency solutions, today announced it has secured $100 million in Series D funding. With this investment, the company will aggressively capitalize on growing customer demand for health care transparency solutions that improve the quality of health care and deliver savings to customers and users. The round brings Castlight Health's total funding to $181 million and includes participation from two major unnamed mutual funds, as well as T. Rowe Price, Redmile Group and previous investors.

Castlight Health enables employers, their employees, and health plans to take control of health care costs and improve care. Named #1 on The Wall Street Journal's list of "The Top 50 Venture-Backed Companies" for 2011 and one of Dow Jones' 50 Most Investment-Worthy Technology Start-Ups, Castlight Health helps the country's self-insured employers and health plans empower consumers to shop for health care. Castlight Health is headquartered in San Francisco and backed by prominent investors including Allen & Company, Cleveland Clinic, Maverick Capital, Morgan Stanley Investment Management, Oak Investment Partners, Redmile Group, T. Rowe Price, U.S. Venture Partners, Venrock, Wellcome Trust and two unnamed mutual funds.