OOH Holdings Ltd engages in the provision of Out-Of-Home (OOH) advertising space and services to customers, that comprise direct advertisers aiming to promote their brands, products or services, and advertising agencies acting for their advertisers. The firm's revenue is derived from the provision of advertising display services and esports event management services. Its segments are Transportation business, Healthcare business, Digital Media business, Logistic Advertising business, Food and Beverage Business, and Digital event management business. It derives a majority of the revenue from the Transportation Business segment which covers the provision of advertising display services over the transportation media platforms. The principal place of the group's operation is in Hong Kong.