ATMI Reports First Quarter 2006 Financial Results; Revenues Up 16% On Strong Customer Demand

ATMI, Inc. (Nasdaq: ATMI), a supplier of specialty
materials and high-purity materials handling and delivery solutions to
the world's leading semiconductor manufacturers, today announced
revenues of $76.9 million for the first quarter of 2006, representing
an increase of 16% from $66.1 million in the first quarter of 2005.
Net income for the quarter increased by 23% to $7.4 million, and
earnings per share increased to $0.20 per diluted share, versus $0.19
per diluted share in the first quarter of 2005. Earnings per share
includes share-based compensation expense of $0.05 per diluted share
in the first quarter of 2006, compared to $0.01 per diluted share in
the first quarter of 2005, reflecting the adoption of FAS 123(R) in
2006.
   Doug Neugold, ATMI Chief Executive Officer, said, "Revenue growth
was strong in the quarter. The 90-nanometer chip generation is
starting to close in on its volume production sweet spot and
65-nanometer chip producers are at the beginning of some very steep
production ramps, which bodes well for ATMI. Product development
activity level with our key customers at 45-nanometer and 32-nanometer
technology generations is also very high. As a result, we are
enthusiastic about our growth outlook. Our focus on 'innovation
generation' has us in the middle of our customers' increasing demand
for new, high performance semiconductor materials and materials
packaging."
   Neugold continued, "Start-up inefficiencies while ramping a new,
high-volume manufacturing line in our packaging operation negatively
affected our gross margins in the quarter, more so than we expected;
now, in the second quarter, that manufacturing line is rapidly
approaching the efficiency levels we originally expected."
   Dan Sharkey, Chief Financial Officer said, "We plan to increase
shareholder value through margin expansion, not only with our
consistently strong organic revenue growth, but also by driving
process efficiency deeper into our, and our customers', operations.
Internally, we focus on several key areas -- such as finance, supply
chain management, manufacturing, shipping, and research and
development -- in an effort to identify process efficiencies that will
help us gain maximum operating leverage from our continuing revenue
growth. Our expectation is that this will result in progressive
improvement during 2006 in our profit margins and faster
time-to-market for new product innovations. During the second quarter,
we estimate revenues in the $77 million-$81 million range, with
diluted earnings per share in the $0.21-$0.25 range."
   A conference call (800.289.0743) discussing financial results will
begin at 11:00 a.m. Eastern time, April 26, 2006. A replay
(888.203.1112, passcode 2417163) of the call will be available for 48
hours. An audio webcast of the conference call will be available for
30 days on atmi.com.
   ATMI provides specialty materials and high-purity materials
handling and delivery solutions to the worldwide semiconductor
industry. For more information, please visit 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 2006
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 (including, without limitation, wafer starts) 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 from
those expressed in our forward-looking statements. ATMI undertakes no
obligation to update any forward-looking statements.
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                              ATMI, INC.
                       SUMMARY INCOME STATEMENTS
                 (in thousands, except per share data)
                              (Unaudited)


                                                   Three Months Ended
                                                        March 31,
                                                    -----------------
                                                       2006     2005
                                                    -------- --------
Revenues                                            $76,936  $66,097
Cost of revenues                                     40,128   31,913
                                                    -------- --------
Gross profit                                         36,808   34,184
Operating expenses:
  Research and development                            6,129    5,284
  Selling, general & administrative                  22,042   19,434
                                                    -------- --------
  Total operating expenses                           28,171   24,718

Operating income                                      8,637    9,466

Other income (expense), net                           2,370     (333)
                                                    -------- --------

Income before income taxes                           11,007    9,133

Income taxes                                          3,577    3,082
                                                    -------- --------

Net income                                           $7,430   $6,051
                                                    ======== ========


Diluted earnings per share                            $0.20    $0.19

Weighted average shares outstanding                  37,809   32,004


                              ATMI, INC.
                 SCHEDULE OF SHARE-BASED COMPENSATION
                 (in thousands, except per share data)
                              (Unaudited)


                                                    Three Months Ended
                                                        March 31,
                                                    -----------------
                                                    2006 (1) 2005 (2)
                                                    -------- --------

Cost of revenues                                       $283       --
Research and development                                227       --
Selling, general & administrative                     2,185     $550
                                                    -------- --------

  Total share-based compensation expense              2,695      550
                                                    -------- --------

Benefit from income taxes                               919      192
                                                    -------- --------

   Net share-based compensation expense              $1,776     $358
                                                    ======== ========


(1) Amounts include amortization expense related to stock options of
    $1.5 million, employee stock purchase plan of $0.2 million, and
    restricted stock awards of $1.0 million, recorded under FAS
    123(R).
(2) Amounts include amortization expense related to restricted stock
    awards of $0.6 million, recorded under APB 25.


                              ATMI, INC.
                        SUMMARY BALANCE SHEETS
                            (in thousands)


Balance Sheet Highlights                         March 31,  December
                                                    2006       31,
                                                (unaudited)    2005
                                                ----------- ---------
Assets
   Cash & marketable securities (1)               $217,116  $209,851
   Accounts receivable, net                         48,677    47,125
   Inventory, net                                   43,050    39,850
   Other current assets                             22,071    21,675
                                                ----------- ---------
      Total current assets                         330,914   318,501
   Fixed assets, net                                83,566    82,821
   Marketable securities, non-current (1)           36,266    46,286
   Other assets                                     51,297    52,228
                                                ----------- ---------
        Total assets                              $502,043  $499,836
                                                ----------- ---------

Liabilities and stockholders' equity
   Accounts payable                                $12,505   $11,910
   Other current liabilities                        29,652    32,268
                                                ----------- ---------
     Total current liabilities                      42,157    44,178
   Non-current liabilities                           2,805     3,460
   Stockholders' equity                            457,081   452,198
                                                ----------- ---------
      Total liabilities & stockholders' equity    $502,043  $499,836
                                                ----------- ---------


(1) Total cash and marketable securities equaled $253.4 million and
    $256.1 million at March 31, 2006 and December 31, 2005,
    respectively.

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