Diamond Sponsor
- MASTRUM
- JR East Marketing & Communications, Inc. (jeki) is a comprehensive advertising company and a media company that owns OOH media. Leveraging its strengths in utilizing public transportation such as stations and trains, it continuously makes innovative, unrestricted plans come true. In April 2023, jeki launched MASTRUM, a platform business focused on OOH media. As a media owner, jeki is developing a platform that facilitates transactions across domestic OOH media, aiming to enhance the overall value of the market. This initiative promotes the automation of media buying with greater efficiency and additional value, covering various OOH formats including digital signage in urban areas.