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"Bohli wants to devote more time to technology group Volpi," one of the sources said on Thursday. An entry on networking site LinkedIn showed Bohli has been on the board of Volpi, which makes electronic components, for a decade.
Credit Suisse declined to comment.
The sources said Bohli is the brother of Rudolf Bohli, whose RBR Capital Advisors hedge fund has taken a stake worth around $100 million in Credit Suisse and been pushing for a revamp.
The sources said this was unrelated to Bohli's departure.