One of Morgan Stanley's most senior investment bankers in London quit just days after Chief Executive James Gorman took the reins at the firm.

John Hyman, co-head of global capital markets at Morgan Stanley, resigned on Monday, according to two headhunting sources, three days after Gorman officially took over from former CEO John Mack.

Neither Morgan Stanley nor Hyman was available to comment.

Hyman announced his departure to a group of managing directors on an internal conference call and is understood to have said he was leaving for "personal reasons," according to a source with knowledge of the situation.

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