OOH Holdings Limited, an investment holding company, provides out-of-home advertising space and services in Hong Kong. It operates through Transportation Business and Healthcare Business segments. The company 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 printing services. In addition, the company sells food and beverage products under the Mizimamei brand name; and pre-owned private vehicles. OOH Holdings Limited was founded in 2004 and is based in Kwun Tong, Hong Kong.