iShares not only remained the biggest exchange-traded fund player in 2009 but expanded its market share from 47.7% at the end of 2008 to 50.1%, according to Morningstar—a remarkable feat given the pace of new entrants and new offerings.

iShares now hold $373 billion, and this is the first time its parent company, Barclays, has expanded the division’s market share since 2006.

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