Although exchange-traded funds continue to grow in popularity, few brokerages offer a dedicated ETF center on their website where investors can see quotes, news, screeners and educational tools about the products, according to "ETF Centers Revisited," a new report from Corporate Insight. Of the 17 brokerage companies that Corporate Insight follows, only five offer ETF centers, up from four in 2004.

"With the attractiveness of ETFs to the retail investor as a diversification tool, we expected to find that most of the brokerage firms we monitor would have centralized offerings on their websites," said Janet Martin, senior analyst with Corporate Insight. "Such is not the case. While all firms offer a variety of proprietary and non-proprietary ETFs for purchase, the majority does not aggregate information about them and place it in an easy-to-use and find location."

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