SAN FRANCISCO--(BUSINESS WIRE)--Castlight Health, Inc. (NYSE:CSLT), a pioneer of the Enterprise Healthcare Cloud, today announced results for its first quarter ended March 31, 2015. “We executed well across the business in the first quarter. Renewals were very strong and included our two largest, non-governmental customers that were up for renewal in 2015. Both signed renewals with us that increased their investments in Castlight solutions,” said Giovanni Colella, president and chief executive