S4 Capital Plc
A digital advertising and marketing services company that helps brands create content, buy digital media, and build technology. Founded in 2018 by Sir Martin Sorrell — the man who built advertising giant WPP — it grew by merging with digital studios MediaMonks and MightyHive, later unifying them under the single brand Media.Monks. The name "S4" comes from Sorrell's surname and his four children.