ONAR Holding Corporation operates as a marketing technology company and agency network in the United States. It operates through Advertising and Marketing and Pool Services segments. The company offers performance digital marketing and technology, healthcare marketing, and experiential marketing services. It also provides installation and maintenance of residual pools; and Cortex, an AI-powered marketing intelligence platform. The company was formerly known as Reliant Holdings, Inc. and changed its name to ONAR Holding Corporation in February 2025. ONAR Holding Corporation was incorporated in 2014 and is based in Los Angeles, California.