ATMI Atmi Inc. (MM)

ATMI to Redeem Convertible Notes DANBURY, Conn., March 9 /PRNewswire-FirstCall/ -- ATMI, Inc. (NASDAQ:ATMI), a supplier of materials and materials packaging to the world's leading semiconductor manufacturers, today announced that, pursuant to the provisions of the Indenture dated November 15, 2001 of its 5.25% convertible subordinated notes due November 16, 2006 (the "Notes"), the Company will exercise its right to redeem the Notes in their entirety. The Notes are to be redeemed on April 8, 2005 at a price of 102.1% of the principal amount, with accrued and unpaid interest to April 8, 2005, unless earlier converted. Note holders who choose to convert their notes into common shares will have until 5 p.m. on Thursday, April 7, 2005 to make their election and to present and surrender their Notes to the corporate trust department of U.S. Bank, successor trustee, at the applicable address shown below: If by Mail: (Registered Bonds) U.S. Bank Corporate Trust Services P.O. Box 64111 St. Paul, MN 55164-0111 If by Mail: (Bearer Bonds) U.S. Bank Corporate Trust Services P.O. Box 64452 St. Paul, MN 55164-0452 If by Hand or Overnight Mail: U.S. Bank Corporate Trust Services 60 Livingston Avenue 1st Fl-Bond Drop Window St. Paul, MN 55107 No interest on the notes will accrue after April 8, 2005. The conversion rate for the Notes is 45.0704 shares per $1000 principal amount, equivalent to approximately $22.19 per share. Were all Note holders to elect to convert their Notes into shares, ATMI would need to issue 5.183 million additional shares, creating diluted shares outstanding of approximately 36.8 million. ATMI provides specialty materials and materials packaging to the worldwide semiconductor industry. As the Source of Semiconductor Process Efficiency, ATMI helps customers improve wafer yields and lower operating costs. For more information, please visit http://atmi.com/. Statements contained herein that relate to ATMI's future performance, including, without limitation, statements with respect to ATMI's anticipated results of operations or level of business for 2005 or any other future period, are forward-looking statements within the safe harbor provisions of the Private Securities Litigation Reform Act of 1995. Such statements are based on current expectations only and are subject to certain risks, uncertainties, and assumptions, including, but not limited to, changes in semiconductor industry growth or ATMI's markets; competition, problems, or delays developing and commercializing new products; problems or delays in integrating acquired operations and businesses; and other factors described in ATMI's filings with the Securities and Exchange Commission. Such risks and uncertainties may cause actual results to differ materially than those expressed in our forward-looking statements. ATMI undertakes no obligation to update any forward-looking statements. DATASOURCE: ATMI, Inc. CONTACT: Dean Hamilton of ATMI Investor & Public Relations, +1-203-207-9349, or +1-203-794-1100, ext. 4202, or Web site: http://www.atmi.com/

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