PowerShares Capital Management LLC is planning to launch eight exchange-traded funds covering a range of sectors, including few that are not yet represented by an ETF--those being funds covering nanotech, building and construction, aerospace and defense.

With the rollout, PowerShares will offer a total of 31 ETFs, making it the second-largest provider of ETFs behind Barclays, which offers 102 ETFs, Dow Jones reports. State Street Corp. and Vanguard both currently offer 23 ETFs.

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