ATMI to Redeem Convertible Notes

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,

[phone], or [phone], ext. 4202, or  



Web site:  http://www.atmi.com/

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