Sebastian Grigg, a vice-chairman at Credit Suisse’s investment bank, resigned from his post late last week.
Grigg’s ESG Corporate Finance will advise UK companies on mergers, takeovers and capital-raising, it was first reported by Sky News.
A number of so-called boutique advisers have proved highly successful in recent years.
Simon Robey and Simon Warshaw, who left jobs at Morgan Stanley and UBS to start their own boutique bank, have worked on multibillion pound takeovers, including the impending acquisition of the brewer SAB Miller by AB InBev.
Investment banking revenues have come under pressure recently at many of the world’s biggest banks amid increasing regulation and a decline in client numbers.