Barclays' iShares ETF business, currently on the auction block, continues to be the market leader, though it may have lost some of its grip on the U.S. market, wrote Ian Salisbury in Wednesday's Wall Street Journal Fund Track column .

Salisbury noted that a number of other U.S. ETF firms gained market share at the expense of iShares. He did not give specific names.

In the 12 months ended in February, investors in the U.S. placed $50 billion into iShares ETFs, according to numbers from the National Stock Exchange. The market downturn caused total assets in Barclays' U.S. ETFs to drop from $307 billion to $214 billion. 

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