ATMI to Present at Investor Conferences

Quarterly Financial Results Calendar for 2006


DANBURY, Conn., April 18, 2006 (PRIMEZONE) -- ATMI, Inc. (Nasdaq:ATMI) today announced that it is scheduled to present at upcoming investor conferences:


 May

 2nd        Merrill Lynch, Tech Gathering
            New York City
      
 3rd        Credit Suisse First Boston, Semiconductor Conference
            New York City, 3:45 p.m.
      
 10th-11th  Piper Jaffray, 8th Annual Hardware & Communications 
            Conference
            New York City
      
 31st       Friedman, Billings, Ramsey, 10th Annual Growth Conference
            New York City
      
 June

 1st        SG Cowen 34th Annual Technology Conference
            New York City, 9:55 a.m.

Where available, webcast links will be posted on ATMI.com's investor, corporate profile page.

ATMI plans to announce financial results on the following dates in 2006, followed by conference calls at 11 a.m. Eastern time:


  April 26, 2006         1st quarter 2006 financial results

Conference call dial-in: 800.289.0743. Interested parties may also listen to the conference call via audio streaming on the Internet at ATMI.com.


  July 26, 2006          2nd quarter 2006 financial results
  October 25, 2006       3rd quarter 2006 financial results

ATMI provides specialty materials and high-purity materials handling and delivery solutions to the worldwide semiconductor industry. For more information, please visit atmi.com.



            

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