The funds, which altogether represent less than 1 percent of PowerShares’ total ETF assets, will stop trading Feb. 26, and be liquidated by March 7. The funds, and their assets, include:

• PowerShares Dynamic Insurance Portfolio (NYSEArca: PIC), $7.8 million in assets.
• PowerShares Morningstar StockInvestor Core Portfolio (NYSEArca: PYH), $14 million.
• PowerShares Dynamic Banking Portfolio (NYSEArca: PJB), $12 million.
• PowerShares Global Steel Portfolio (NasdaqGM: PSTL), $1.9 million.
• PowerShares Active Low Duration Portfolio (NYSEArca: PLK), $7.6 million.
• PowerShares Global Wind Energy Portfolio (NasdaqGM: PWND), $9 million.
• PowerShares Active Mega-Cap Portfolio (NYSEArca: PMA), $5.8 million.
• PowerShares Global Coal Portfolio (NasdaqGM: PKOL), $10 million.
• PowerShares Global Nuclear Energy Portfolio (NYSEArca: PKN), $10.6 million.
• PowerShares Ibbotson Alternative Completion Portfolio (NYSEArca: PTO), $8.7 million.
• PowerShares RiverFront Tactical Balanced Growth Portfolio (NYSEArca: PAO), $15.5 million.
• PowerShares RiverFront Tactical Growth & Income Portfolio (NYSEArca: PCA), $15.8 million.
• PowerShares Convertible Securities Portfolio (NYSEArca: CVRT), $9.43 million.

While total U.S.-listed ETF assets have been reaching record levels this year—most recently just shy of $1.349 trillion on Dec. 18—closures have been accelerating while fund launches have been slowing.

Industry sources say the industry is starting to mature and, moreover, the risk-on/risk-off flavor of markets since the 2008 crash has made fund sponsors more cautious in general about launching new ideas or defending ones that aren’t catching on very quickly.

Moreover, pruning product offerings can free up resources for fund sponsors to pursue newer, more prospective fund ideas more thoroughly and aggressively.

The latest PowerShares closures will bring to 110 the number of funds that are shutting so far this year. In 2011, 30 funds shut down, compared with 49 in 2010, 56 in 2009, 59 in 2008 and none in 2007, according to data compiled by IndexUniverse.

Details On PowerShares Shutdowns

Investors who own any of these ETFs may sell their holdings on or before Feb. 26, 2013, and may incur typical transaction fees from their broker-dealer, PowerShares said in a press release.

Anyone still holding shares at that date will receive cash equal to the amount of the net asset value of their shares, which will include any capital gains and dividends, on the liquidation date.

“Shareholders will generally recognize a capital gain or loss equal to the amount received for their shares over their adjusted basis in such shares,” PowerShares said in the release.