S4 Capital plc is a digital advertising and marketing services company that operates globally, with a strong presence in the Americas, Europe and the Middle East, and the Asia Pacific. The company offers various services, such as contents, campaigns, and assets for paid, social, and earned media, as well as brand activations. Its services also include campaign management analytics, creative production and ad serving, platform and systems integration and transition, and training and education services. The company was founded in 2016 and is based in London, UK.