S4Capital plc is the tech-led, new age/new era digital advertising and marketing services company, established by Sir Martin Sorrell in May 2018.

Its strategy is to build a purely digital advertising and marketing services business for global, multinational, regional, local clients, and millennial-driven influencer brands. This will be achieved by integrating leading businesses in three practice areas: Content, Data&digital media and Technology services, along with an emphasis on "faster, better, more efficient" executions in an always-on consumer-led environment, with a unitary structure.