The PowerShares QQQ is one of the most widely traded shares on the stock market, according to writer John J.

[5][4] PowerShares ETFs also cover the commodities market, diversified and tiny or microcap stocks.

[citation needed] In 2006, PowerShares offered an exchange traded fund in the private equity market in a "diversified fashion", although a report in BusinessWeek suggested that analysts thought that the fund was "something people can live without".

[8] In 2005, PowerShares developed a fund to allow customers to invest in "tiny companies" or microcaps; according to a report in the New York Times, the Powershares Zacks Micro Cap Portfolio owns 330 stocks which follow the index of Zacks Investment Research, and the PowerShares ETF re-evaluates these tiny companies weekly, removing those which "do not pass muster".

[2] In 2010, the firm was involved in a trademark infringement dispute with Select Sector SPDR Trust over whether trading symbols, or tickers, could be considered as brand names.