Warnings from Charles Schwab and Ameritrade (see related story, below), could portend further trouble at the online brokerage giants, which also serve as fund supermarkets, Reuters reports.

Schwab lowered its first-quarter profit forecast Thursday, and Ameritrade lowered its second-quarter and full-year predictions Friday. Trading volume in February declined 20% for Schwab from year-ago levels, while it sank 21% for Schwab.

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