Apple has beaten Google to return to the top, with Amazon in third place.
The entire global business is worth $1.8 billion globally and kicks in starting in January.
Sir Martin Sorrell has confirmed details of his return to the front line of advertising only weeks after leaving WPP, with the launch of a new "multinational communication services business".
The tool will be unveiled at the group’s Viva Technology event in Paris in May.
Arthur Sadoun appears to be showing the strain of leading Publicis Groupe in the company's annual Christmas message to its employees.
The five-month pitch covered the company’s largest markets, including China, Indonesia and India.
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