American Stock Exchange to Trade Options on Three Securities NEW YORK, March 11 /PRNewswire/ -- The American Stock Exchange(R) (Amex(R)) will launch trading in options on Friday, March 12, 2004 on the following Nasdaq Stock Market and New York StockExchange listed stocks of: * Alberto-Culver Company (NYSE:ACV) * HRPT Properties Trust (NYSE:HRP) * Allos Therapeutics, Inc. (NASDAQ:ALTH/NASDAQ:OptionNASDAQ:Symbol:NASDAQ:RYU) Alberto-Culver Company options will open with strike prices of40 - 45 - 50 and position limits of 3,150,000 shares. The options will trade on the March expiration cycle with initial expirations in March, April, June and September. The specialist will be Highland Securities Corp. Alberto-Culver Company manufactures, distributes and markets personal care products, including Alberto VO5, St. Ives and TRESSemme in the United States and internationally. Allos Therapeutics, Inc. will open with strike prices of 2 1/2 - 5 - 7 1/2 and position limits of 7,500,000 shares. The options will trade on the January expiration cycle with initial expirations in March, April, July and October. The specialist will be Tanstaafl Research & Trading, LLC. Allos Therapeutics, Inc. develops and commercializes small molecule pharmaceuticals that improve cancer treatments HRPT Properties Trust will open with strike prices of 7 1/2 - 10 - 12 1/2 and position limits of 3,150,000 shares. The options will trade on the January expiration cycle with initial expirations in March, April, July and October. The specialist will be Tanstaafl Research & Trading, LLC. HRPT Properties Trust is a Real Estate Investment Trust that acquires, owns and leases office buildings and senior housing properties. 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 pioneerof the ETF, responsible for bringing the first domestic product to market in 1993. Leading the industry in ETF listings, the Amex lists 138 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. DATASOURCE: American Stock Exchange CONTACT: Lynn Teresky of American Stock Exchange, +1-212-306-1654, Web site: http://www.amex.com/

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