Invesco’s (NYSE: IVZ) PowerShares, the fourth-largest U.S. exchange traded funds issuer, today announced name, index and investment objective changes for three of its municipal bond ETFs.

“Effective July 8, 2014, the PowerShares Insured National Municipal Bond Portfolio (NYSEArca: PZA) will track the BofA ML National Long-Term Core Plus Municipal Securities Index (UNAP), the PowerShares Insured New York Municipal Bond Portfolio (NYArca: PZT) will track the BofA ML New York Long-Term Core Plus Municipal Securities Index (UNYP) and the PowerShares Insured California Municipal Bond Portfolio (NYSEArca: PWZ) will track the BofA ML California Long-Term Core Plus Municipal Securities Index (UCAP),” said PowerShares in a statement.

PZA, which debuted in October 2007, charges 0.28% per year and has $642 million in assets under management. The ETF currently has a 30-day SEC yield of 3.2% and an effective duration of 7.9 years.

PZT also has an annual expense ratio of 0.28% with a 30-day SEC yield of 2.78% and an effective duration of 7.2 years. The $55.1 million PWZ has a 30-day SEC yield of 2.7% and an effective duration of 6.76 years. Like PZA and PZT, PWZ debuted in October 2007 and charges 0.28% per year.

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