S4 Capital PLC is a digital advertising and marketing services company that operates through its global agency brand, Monks. It provides integrated marketing and technology services, focusing on digital-first solutions that disrupt traditional advertising models. The company serves a diverse clientele, including multinational corporations and millennial-driven brands, across various regions including the Americas, EMEA, and APAC. S4 Capital generates revenue by leveraging data, media, and technology to enhance brand engagement and drive business growth for its clients.