Sorrell, 73, stepped down suddenly, 10 days after the British ad giant launched an independent investigation into allegations of personal misconduct through the misuse of company assets.
WPP said the probe had concluded, adding that “the allegation did not involve amounts that are material.”
He was easily the longest serving chief executive of a company on London’s FTSE 100 share index, having held the position since 1985.
The departure of one of Britain’s best-known businessmen leaves the advertising giant needing fresh leadership at a testing time for the marketing industry, with social media companies offering brands a direct connection with vast audiences.
Sorrell said in a statement late Saturday that he was sad to leave, with WPP having been his passion and focus for more than three decades.
“The current disruption is simply putting too much unnecessary pressure on the business, our over 200,000 people and their 500,000 or so dependents, and the clients we serve in 112 countries,” he said.
“That is why I have decided that in your interest, in the interest of our clients, in the interest of all share owners, both big and small, and in the interest of all our other stakeholders, it is best for me to step aside.”
Sky News television’s City editor Mark Kleinman said his resignation was one of the most significant exits of a FTSE 100 company chief executive for many years.
“His departure will leave the company he built virtually from scratch facing profound questions about its future direction,” he said.
Despite the misconduct investigation, some commentators said it was the fact that the company had lost a third of its value over the past 12 months — in the face of competition from the likes of Google and Facebook — that cost Sorrell his post.
Simon Jack, the BBC’s business editor, said his legacy as an advertising industry titan was secure.
However, “in the end, it was the trends in world business that wrong-footed the sprawling empire he created.
“Shareholders were getting restless,” he wrote, and Sorrell “had lost the unanimous backing of the board.”
WPP said chairman Roberto Quarta is now executive chairman until a new CEO is appointed.
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