- Arena Media
- Avante Comunicación, S.L.
- Carat España, S.A.
- Dentsu X
- EssenceMediacom Iberia, S.A.
- Havas Media Group
- IKI Media
- Initiative Media
- Media Investment Optimization, S.A. (Mio Group)
- iProspect Advertising, S.A.U.
- Mediaplus Alma, S.A.
- Mediaplus Equmedia, S.L.
- Mindshare Spain, S.A.
- Normmal Media & Creatividad, S.L.U.
- OMD Optimum Media Direction, S.L.
- PHD Media Spain, S.L.U.
- Spark Foundry
- Starcom Mediavest Group Iberia, S.L.
- The Digital Gate, S.L.
- Universal McCann, S.A.
- Veritas Media, S.L.
- Wavemaker Publicidad Spain, S.L.
- Zenith Media, S.L.U.