CSTL

Castle Biosciences, Inc. (NASDAQ:CSTL) is a commercial-stage diagnostics company founded in 2007 and headquartered in Friendswood, Texas. The company went public in July 2019 and has established itself as a leading provider of gene expression profile (GEP) tests for various medical conditions, with a primary focus on dermatological cancers. Castle has evolved from a single-product company focused on melanoma testing to a diversified diagnostics platform serving dermatology, gastroenterology, and mental health markets through both organic growth and strategic acquisitions.