Steve Hill, the chief executive of Wagamama, has stepped down from his role after six years.
Chief financial officer Antony Perring and operations director Glyn House are set to oversee the running of the business until a successor for Hill is found.
In a statement to staff, chairman David Williams said: "Steve's leadership over the past six years has undoubtedly been instrumental in making Wagamama the huge success that it is today.
"During his tenure as CEO, the business has more than doubled in size in the UK and has established a firm presence internationally, both through the continued expansion of the Wagamama franchises and with the successful launch of our brand in the USA. There is now a clear growth strategy in place to drive the business to its next stage of growth."
Wagamama is owned by private equity firm Duke Street Capital, which purchased the group from Lion Capital, saying that it would take it to some 300 units in a secondary private-equity transaction last year for around £215m.
By Neil Gerrard
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