ATMI to Present at Investor Conferences in January & February 2005 DANBURY, Conn., Dec. 20 /PRNewswire-FirstCall/ -- ATMI, Inc. (NASDAQ: ATMI) today announced that it is scheduled to present at two investor conferences during January and February 2005. Where available, webcast links will be posted on atmi.com's investor page. January * 11th - Needham & Co. 7th Annual Growth Conference * New York City; 3:00 p.m. local time. February * 23rd - 19th Annual Goldman Sachs Technology Investment Symposium * Phoenix, Arizona; 2:10 p.m. local time. ATMI provides specialty materials and materials packaging to the worldwide semiconductor industry. As the Source of Semiconductor Process Efficiency, ATMI helps customers to improve wafer yields and to lower operating costs. For more information, please visit atmi.com. DATASOURCE: ATMI, Inc. CONTACT: Dean Hamilton, ATMI Investor & Public Relations, +1-203-207-9349, Direct, +1-203-794-1100 ext. 4202, Web site: http://www.atmi.com/

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