The veteran, who was part of its founding team in 1995, will be replaced by chair and former Future CEO
Byng-Thorne joined the firm just weeks ago as chair and non-executive director after a decade at the top of stock market darling Future.
MacLennan, who joined Saatchi & Saatchi in 1983, said: "It has been a rare privilege to work for three decades with people I respect and like, creating work that has had an extraordinary impact on the world.
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The news comes as part of a wider leadership shakeup at the advertising giant, after chair
Analysts at
Investors seemed unperturbed, however, with shares closing up 3.72 per cent yesterday.
The firm last year reported a net revenue of £271m, an almost 10 per cent year-onyear increase.
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