It must feel like a triumph, or at least one in waiting. Having left WPP, the company he took control of in 1986 and turned into the world’s largest marketing and advertising agency, Sir Martin Sorrell has been busy, intent, perhaps, on proving any doubters wrong. At 74, he has returned to the fray with S4 Capital, a digital-only advertising agency created through a reverse takeover, and has been steadily adding acquisitions and building a business whose market value surely will soon pass the £1 billion mark.
Sir Martin has packed a lot into what is still only a relatively few, short months. S4 Capital was set up at the end of September 2018, when Mediamonks, a privately owned Dutch digital advertising specialist that had