/C O R R E C T I O N -- The American Stock Exchange/ In the news release, American Stock Exchange to Trade Options on Seven PowerShares, issued yesterday, March 2, by The American Stock Exchange over PR Newswire, we are advised by the company that the second paragraph, third sentence, should read "PowerShares Wilderhill Clean Energy Portfolio is an exchange-traded fund incorporated in the USA," rather than "a closed-end fund" as originally issued inadvertently. Complete, corrected release follows: NEW YORK, March 2 /PRNewswire/ -- The American Stock Exchange(R) (Amex(R)) will launch trading in options on Thursday, March 3, 2005 on the underlying shares of * PowerShares WilderHill Clean Energy Portfolio (PBW) * PowerShares Dynamic Large Cap Growth Portfolio (PWB) * PowerShares Dynamic Large Cap Value Portfolio (PWV) * PowerShares Dynamic Mid Cap Growth Portfolio (PWJ) * PowerShares Dynamic Mid Cap Value Portfolio (PWP) * PowerShares Dynamic Small Cap Growth Portfolio (PWT) * PowerShares Dynamic Small Cap Value Portfolio (PWY) The PowerShares WilderHill Clean Energy Portfolio (PBW) will open with strike prices of 10-20 with one-point increments and position limits of 1,350,000 shares. The options will trade on the March expiration cycle with initial expirations in March, April, June and September. The specialist will be LaBranche Structured Products, LLC. PowerShares Wilderhill Clean Energy Portfolio is an exchange-traded fund incorporated in the USA. The Fund's investment objective seeks to correspond to the price and yield of the Wilderhill Clean Energy Portfolio. PowerShares Dynamic Large Cap Growth Portfolio (PWB) will open with strike prices of 10-20 with one-point increments and position limits of 1,350,000 shares. The options will trade on the March expiration cycle with initial expirations in March, April, June and September. The specialist will be LaBranche Structured Products, LLC. PowerShares Dynamic Large Cap Growth Portfolio is an exchange-traded fund incorporated in the USA. The Fund seeks investment results that correspond the prices and yield of the Dynamic Large Cap Growth Intellidex Index. PowerShares Dynamic Large Cap Value Portfolio (PWV) will open with strike prices of 10-20 with one-point increments and position limits of 1,350,000 shares. The options will trade on the March expiration cycle with initial expirations in March, April, June and September. The specialist will be LaBranche Structured Products, LLC. PowerShares Dynamic Large Cap Value Portfolio is an exchange-traded fund incorporated in the USA. The Fund seeks investment results that correspond the prices and yield of the Dynamic Large Cap Value Intellidex Index. PowerShares Dynamic Mid Cap Growth Portfolio (PWJ) will open with strike prices of 10-20 with one-point increments and position limits of 1,350,000 shares. The options will trade on the March expiration cycle with initial expirations in March, April, June and September. The specialist will be LaBranche Structured Products, LLC. PowerShares Dynamic Mid Cap Growth Portfolio is an exchange-traded fund incorporated in the USA. The Fund seeks investment results that correspond the prices and yield of the Dynamic Large Cap Value Intellidex Index. PowerShares Dynamic Mid Cap Value Portfolio (PWP) will open with strike prices of 10-20 with one-point increments and position limits of 1,350,000 shares. The options will trade on the March expiration cycle with initial expirations in March, April, June and September. The specialist will be LaBranche Structured Products, LLC. PowerShares Dynamic Mid Cap Value Portfolio is an exchange-traded fund incorporated in the USA. The Fund seeks investment results that correspond the prices and yield of the Dynamic Large Cap Value Intellidex Index. PowerShares Dynamic Small Cap Growth Portfolio (PWT) will open with strike prices of 10-20 with one-point increments and position limits of 1,350,000 shares. The options will trade on the March expiration cycle with initial expirations in March, April, June and September. The specialist will be Kellogg Capital Group, LLC. PowerShares Dynamic Small Cap Growth Portfolio is an exchange-traded fund incorporated in the USA. The Fund seeks investment results that correspond the prices and yield of the Dynamic Small Cap Growth Intellidex Index. PowerShares Dynamic Small Cap Value Portfolio (PWY) will open with strike prices of 10-20 with one-point increments and position limits of 1,350,000 shares. The options will trade on the March expiration cycle with initial expirations in March, April, June and September. The specialist will be Kellogg Capital Group, LLC. PowerShares Dynamic Small Cap Value Portfolio is an exchange-traded fund incorporated in the USA. The Fund seeks investment results that correspond the prices and yield of the Dynamic Small Cap Value Intellidex Index. The American Stock Exchange(R) (Amex(R)) is the only primary exchange that offers trading across a full range of equities, options and exchange traded funds (ETFs), including structured products and HOLDRS(SM). In addition to its role as a national equities market, the Amex is the pioneer of the ETF, responsible for bringing the first domestic product to market in 1993. Leading the industry in ETF listings, the Amex lists 145 ETFs to date. The Amex is also one of the largest options exchanges in the U.S., trading options on broad-based and sector indexes as well as domestic and foreign stocks. For more information, please visit http://www.amex.com/. DATASOURCE: The American Stock Exchange CONTACT: Mary Chung of the American Stock Exchange, +1-212-306-1641, Web site: http://www.amex.com/

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