S4 Capital plc, together with its subsidiaries, provides digital advertising, marketing, and technology services across the Americas, Europe, the Middle East, Africa, and the Asia Pacific. Its offerings include content, campaigns, and assets for paid, social, and earned media, such as digital platforms and apps, as well as brand activations. The company also provides campaign management analytics, creative production and ad serving, platform and systems integration, transition, and training and education services, along with digital transformation services covering digital product design, engineering, and delivery. It has a strategic partnership with Windsurf to create an AI development environment, and is headquartered in London, the United Kingdom.