Wiedman, head of the global client business, was instrumental in driving BlackRock's growth in passive investing.

Mark Wiedman, one of BlackRock’s most senior executives and a potential successor to CEO Larry Fink, is leaving the world’s largest asset manager in a shuffle of its top ranks of leadership.

A potential successor to BlackRock CEO Larry Fink is reportedly leaving the firm, narrowing the list of contenders to become the next boss of the world's largest money manager.

Over more than two decades at BlackRock, Wiedman was known for leading the integration of Barclays Global Investors and the iShares exchange-traded fund business after BlackRock a

Asset manager BlackRock's senior executive Mark Wiedman, who was touted to be a potential successor to CEO Larry Fink, is departing the firm, said two sources familiar with the matter.

Wiedman, who joined BlackRock in 2004 to help build the firm’s Financial Markets Advisory Group, was seen as one of a handful of the New York-based money management giant’s executives who could be tapped to fill CEO Larry Fink’s shoes when the 72-year-old co-founder of the firm eventually retires.