OOH Holdings Limited, an investment holding company, engages in the provision of out-of-home advertising space and services in Hong Kong. The company operates through Transportation Business and Healthcare Business segments. It offers advertising display services on transportation and healthcare media platforms. It also provides design and production, and advertisement logistics services on various advertising platforms and pre-owned private vehicles. OOH Holdings Limited was founded in 2004 and is based in Kwun Tong, Hong Kong.