SuperGroup chief operating officer Diane Savory is to stand down after 20 years at the retailer.
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Savory said she is leaving for personal reasons and will depart on May 6.
The retailer said Savory had contributed greatly to its success and played a crucial role in preparing for its flotation last year.
SuperGroup chief executive Julian Dunkerton said: “We fully respect and understand Diane’s decision. It has been a pleasure to work with her over the last 20 years and I know she will remain passionate about the company and its future.”