ATMI INC
10-Q, 1999-08-16
INDUSTRIAL INORGANIC CHEMICALS
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549


                                   FORM 10-Q


[X]      QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
         SECURITIES EXCHANGE ACT OF 1934


For the quarterly period ended June 30, 1999


[ ]      TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
         SECURITIES EXCHANGE ACT OF 1934


For the transition period from __________ to  __________


Commission file Number: 0-30130


                                   ATMI, Inc.
             (Exact name of registrant as specified in its charter)


                 Delaware                                06-1481060
      (State or other jurisdiction of     (I.R.S. Employer Identification No.)
       incorporation or organization)


         7 Commerce Drive, Danbury, CT                      06810
         (Address of principal executive offices)          (Zip Code)



                                  203-794-1100
              (Registrant's telephone number, including area code)




- - --------------------------------------------------------------------------------
Indicate by check mark whether the registrant (1) has filed all reports required
to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during
the  preceding 12 months (or for such  shorter  period that the  registrant  was
required  to file  such  reports),  and  (2) has  been  subject  to such  filing
requirements for the past 90 days. Yes x No __


The number of shares outstanding of the registrant's common stock as of July 30,
1999 was 26,108,525.

<PAGE>


                                   ATMI, INC.
                          Quarterly Report on Form 10-Q
                       For the Quarter Ended June 30, 1999

                                TABLE OF CONTENTS

Part I - Financial Information                                          Page

Item 1.  Financial Statements

           Consolidated Balance Sheet................................

           Consolidated Statement of Income..........................

           Consolidated Statement of Cash Flows......................

           Notes to Consolidated Interim Financial Statements........

Item 2.  Management's Discussion and Analysis of Financial
         Condition and Results of Operations.........................

Item 3.  Quantitative and Qualitative Disclosures about Market
         Risk........................................................

Part II - Other Information

Item 2.  Changes in Securities and Use of Proceeds...................

Item 4.  Submission of Matters to a Vote of Security Holders.........

Item 6.  Exhibits and Reports on Form 8-K............................


Signatures...........................................................

<PAGE>
PART I - FINANCIAL INFORMATION
Item 1. Financial Statements


                                   ATMI, Inc.
                           Consolidated Balance Sheet

<TABLE>
<CAPTION>
                                                     June 30,      December 31,
                                                       1999            1998
                                                  -------------    -------------
                                                   (unaudited)
<S>                                               <C>             <C>
Assets
Current assets:
   Cash and cash equivalents                      $  22,427,000   $  21,128,000
   Marketable securities                             64,262,000      64,551,000
   Accounts receivable, net of allowance
     for doubtful accounts of $1,083,000
     in 1999 and $794,000 in 1998                    28,754,000      20,747,000
   Inventories                                       15,666,000      15,563,000
   Other                                              5,995,000       7,610,000
                                                  -------------   -------------
Total current assets                                137,104,000     129,599,000

Property and equipment, net                          49,383,000      50,185,000

Goodwill and other long-term assets, net              4,949,000       8,410,000
                                                  -------------   -------------
                                                  $ 191,436,000   $ 188,194,000
                                                  =============   =============
Liabilities and stockholders' equity
Current liabilities:
   Loans, notes and bonds payable, current
     portion                                      $   3,949,000   $   6,602,000
   Capital lease obligations, current portion         2,270,000       2,493,000
   Accounts payable                                   7,560,000       6,903,000
   Accrued expenses                                  11,420,000      10,485,000
   Accrued commissions                                1,308,000       1,315,000
   Income taxes and other current payables            4,265,000       1,803,000
                                                  -------------   -------------
Total current liabilities                            30,772,000      29,601,000

Loans, notes and bonds payable, less current
   portion                                            2,100,000       5,110,000
Capital lease obligations                             2,757,000       3,746,000
Deferred income taxes                                 3,205,000       2,041,000
Other long-term liabilities                           1,921,000         288,000

Minority interest                                       927,000         846,000

Stockholders' equity:
    Preferred stock, par value $.01: 2,000,000
      shares authorized; none issued and
      outstanding                                          --              --
    Common stock, par value $.01: 50,000,000
      shares authorized; issued and
      outstanding 26,088,000 in 1999 and 25,941,000
      in 1998
                                                        261,000         259,000
    Additional paid-in capital                      114,044,000     113,059,000
    Retained earnings                                34,857,000      34,547,000
    Accumulated other comprehensive income (loss)       592,000      (1,303,000)
                                                  -------------   -------------
Total stockholders' equity                          149,754,000     146,562,000
                                                  -------------   -------------
                                                  $ 191,436,000   $ 188,194,000
                                                  =============   =============
</TABLE>
See accompanying notes
<PAGE>

                                   ATMI, Inc.
                        Consolidated Statement of Income
                                   (unaudited)

<TABLE>
<CAPTION>
                                                    Three months ended June 30,
                                                        1999          1998
                                                        ----          ----
<S>                                                <C>             <C>
Revenues                                           $ 42,976,000    $ 36,905,000
Cost of revenues                                     20,884,000      20,026,000
                                                   ------------    ------------
Gross profit                                         22,092,000      16,879,000

Operating expenses:
   Research and development                           4,109,000       4,050,000
   Selling, general and administrative               12,355,000      11,661,000
   Merger and related costs                           6,800,000            --
                                                   ------------    ------------
                                                     23,264,000      15,711,000
                                                   ------------    ------------
Operating income (loss)                              (1,172,000)      1,168,000
Interest income                                         990,000       1,229,000
Interest expense                                       (188,000)       (410,000)
Other income (expense), net                             (16,000)        (18,000)
                                                   ------------    ------------
Income (loss) before taxes and minority interest       (386,000)      1,969,000

Provision for income taxes                            1,002,000         887,000
                                                   ------------    ------------
Income (loss) before minority interest               (1,388,000)      1,082,000

Minority interest                                       (82,000)        (13,000)
                                                   ------------    ------------
Net income (loss)                                  $ (1,470,000)   $  1,069,000
                                                   ============    ============
Net income (loss) per share-basic                  $      (0.06)   $       0.04
                                                   ============    ============
Net income (loss) per share-assuming dilution      $      (0.06)   $       0.04
                                                   ============    ============
Weighted average shares outstanding                  25,013,000      24,715,000
                                                   ============    ============
Weighted average shares outstanding-assuming
  dilution                                           25,013,000      26,295,000
                                                   ============    ============
</TABLE>
See accompanying notes.
<PAGE>

                                   ATMI, Inc.
                        Consolidated Statement of Income
                                   (unaudited)
<TABLE>
<CAPTION>
                                                     Six months ended June 30,
                                                       1999            1998
                                                       ----            ----
<S>                                                <C>             <C>
Revenues                                           $ 75,540,000    $ 83,541,000
Cost of revenues                                     37,105,000      41,292,000
                                                   ------------    ------------
Gross profit                                         38,435,000      42,249,000

Operating expenses:
   Research and development                           7,704,000       7,667,000
   Selling, general and administrative               22,810,000      25,020,000
   Merger and related costs                           6,800,000            --
                                                   ------------    ------------
                                                     37,314,000      32,687,000
                                                   ------------    ------------
Operating income                                      1,121,000       9,562,000

Interest income                                       2,041,000       1,685,000
Interest expense                                       (451,000)       (861,000)
Other income (expense), net                              41,000         108,000
                                                   ------------    ------------
Income before taxes and minority interest             2,752,000      10,494,000

Provision for income taxes                            2,198,000       3,921,000
                                                   ------------    ------------
Income before minority interest                         554,000       6,573,000

Minority interest                                       (81,000)        (68,000)
                                                   ------------    ------------
Net income                                         $    473,000    $  6,505,000
                                                   ============    ============
Net income per share-basic                         $       0.02    $       0.28
                                                   ============    ============
Net income per share-assuming dilution             $       0.02    $       0.26
                                                   ============    ============
Weighted average shares outstanding                  24,988,000      23,627,000
                                                   ============    ============
Weighted average shares outstanding-assuming
  dilution                                           26,520,000      25,248,000
                                                   ============    ============
</TABLE>
See accompanying notes.
<PAGE>

                                   ATMI, Inc.
                      Consolidated Statement of Cash Flows
                                   (unaudited)
<TABLE>
<CAPTION>
                                                    Six months ended June 30,
                                                       1999            1998
                                                       ----            ----
<S>                                                   <C>           <C>
Operating activities
Net income                                            $    473,000  $ 6,505,000
Adjustments to reconcile net income to net cash
   provided by operating activities:
     Depreciation and amortization                       4,798,000    4,161,000
     Long-lived asset impairment                         3,386,000          --
     Deferred income taxes                               1,409,000      896,000
     Bad debt expense                                      290,000      121,000
     Effect of change of fiscal year of pooled
       entity                                             (163,000)         --
     Minority interest in net earnings of
       consolidated subsidiaries                            81,000       68,000
     Changes in operating assets and liabilities
         Decrease (increase) in accounts receivable     (8,297,000)   5,777,000
         Increase in inventory                            (103,000)  (2,547,000)
         Decrease (increase) in other assets             1,709,000   (2,375,000)
         Increase (decrease) in accounts payable           657,000   (2,114,000)
         Increase (decrease) in accrued expenses           928,000   (4,928,000)
         Increase (decrease) in other liabilities        2,927,000     (897,000)
                                                      ------------  ------------
Total adjustments                                        7,622,000   (1,838,000)
                                                      ------------  ------------
Net cash provided by operating activities                8,095,000    4,667,000
                                                      ------------  ------------
Investing activities
Capital expenditures                                    (3,849,000)  (6,614,000)
(Purchase) sale of marketable securities, net            2,852,000  (56,440,000)
                                                      ------------   -----------
Net cash used by investing activities                     (997,000  (63,054,000)
                                                      ------------  ------------
Financing activities
Principal payments on capital lease obligations         (1,212,000)  (1,618,000)
Principal payments on loans, notes and bonds
  payable, net                                          (5,663,000)    (309,000)
Proceeds from sale of common shares, net                      --     62,426,000
Proceeds from the exercise of stock options
  and warrants                                             987,000      400,000
                                                      ------------  ------------
Net cash provided (used) by financing activities        (5,888,000)  60,899,000
                                                      ------------  ------------
Effects of exchange rate changes on cash                    89,000       34,000

Net increase in cash and cash equivalents                1,299,000    2,546,000
Cash and cash equivalents, beginning of period          21,128,000   15,122,000
                                                      ------------  ------------
Cash and cash equivalents, end of period              $ 22,427,000   17,668,000
                                                      ============  ============
</TABLE>
See accompanying notes.

<PAGE>
                                   ATMI, Inc.
               Notes To Consolidated Interim Financial Statements
                                   (unaudited)


1.  BASIS OF PRESENTATION

     The accompanying  unaudited  consolidated  interim financial  statements of
ATMI,  Inc.  ("ATMI" or the "Company") have been prepared in accordance with the
instructions  to Form 10-Q and Article 10 of  Regulation  S-X and do not include
all of the financial  information and disclosures required by generally accepted
accounting  principles.   In  addition,  these  unaudited  consolidated  interim
financial  statements  give  retroactive  effect  to  the  acquisitions  of  NOW
Technologies,  Inc.  ("NOW"),  TeloSense  Corporation  ("TeloSense"),   Delatech
Incorporated  ("Delatech"),  and Advanced Chemical Systems International,  Inc.,
("ACSI")  which have been accounted for using the  pooling-of-interests  method.
These acquisitions occurred on August 4, 1998, May 5, 1999, May 31, 1999 and May
31, 1999, respectively, and are more fully described in the Company's Form 8-K/A
dated May 31, 1999.

     The balance  sheet at December  31, 1998 has been  derived from the audited
consolidated  financial  statements at that date but does not include all of the
information and footnotes required by generally accepted  accounting  principles
for complete financial statements.

     In the opinion of the  management of ATMI,  Inc. the financial  information
contained herein has been prepared on the same basis as the audited Supplemental
Consolidated  Financial  Statements  contained in the Company's Form 8-K/A dated
May 31, 1999,  and includes  adjustments  (consisting  only of normal  recurring
adjustments)  necessary to present  fairly the unaudited  quarterly  results set
forth herein. The Company's quarterly results have, in the past, been subject to
fluctuation and, thus, the operating results for any quarter are not necessarily
indicative of results for any future fiscal period.

2.  PER SHARE DATA

     The following table presents the computation of basic and diluted  earnings
per share:

<TABLE>
<CAPTION>
                                                               Three Months Ended                 Six Months Ended
                                                                    June 30,                          June 30,
                                                                 1999       1998                1999          1998
                                                                 ----       ----                ----          ----
<S>                                                         <C>             <C>            <C>            <C>
Numerator:
  Net income (loss)                                         $ (1,470,000)   $  1,069,000   $    473,000   $ 6,505,000
                                                             ============    ============   ============   ===========
Denominator:
  Denominator for basic earnings per share                    25,013,000      24,715,000     24,988,000    23,627,000
  Dilutive effect of contingent shares related
     to acquisitions                                                 --        1,135,000      1,055,000     1,135,000
  Dilutive effect of employee stock options
       and warrants, net of tax benefit                              --          445,000        477,000       486,000
                                                              ----------       ---------    -----------   -----------
Denominator for diluted earnings per share                    25,013,000      26,295,000     26,520,000    25,248,000
                                                            ============    ============   ============   ===========
  Net income (loss)  per share--basic                       $      (0.06)   $       0.04   $       0.02   $      0.28
                                                            ============    ============   ============   ===========
  Net income (loss) per share--assuming dilution            $      (0.06)   $       0.04   $       0.02   $      0.26
                                                            ============    ============   ============   ===========
</TABLE>


3.  INVENTORY

Inventory is comprised of the following:

<TABLE>
<CAPTION>
                                        June 30,            December 31,
                                          1999                  1998
                                    ---------------     ------------------
<S>                                  <C>                     <C>
Raw materials                        $ 13,560,000            $ 12,542,000
Work in process                           530,000                 839,000
Finished goods                          3,654,000               3,605,000
                                    ---------------     ------------------
                                       17,744,000              16,986,000
Obsolescence reserve                   (2,078,000)             (1,423,000)
                                    ---------------     ------------------
                                       15,666,000            $ 15,563,000
                                    ===============     ==================
</TABLE>

4.  INCOME TAXES

     The Company was notified by the Internal  Revenue  Service of an assessment
for certain tax matters in the amount of approximately  $2 million.  The Company
believes that such assessment is without merit and intends to vigorously  defend
its position in these matters.  Although the former  securityholders of the ADCS
Group have agreed to indemnify the Company  against  losses  arising out of such
tax matters,  this  assessment,  if ultimately  determined  against the Company,
would result in a charge to the Company's results of operations.

5. COMPREHENSIVE INCOME

     Comprehensive  income is a more inclusive financial  reporting  methodology
that includes disclosure of certain financial  information that historically has
not been recognized in the calculation of net income.

     The following  table presents the computation of  comprehensive  income for
the three and six months ended June 30:

<TABLE>
<CAPTION>
                                                Three Months Ended                Six Months Ended
                                                      June 30,                         June 30,
                                              1999            1998             1999            1998
                                        ---------------------------------   --------------------------------
<S>                                     <C>              <C>                <C>            <C>
Net income (loss)                       $ (1,470,000)    $ 1,069,000        $ 473,000      $ 6,505,000
                                        ---------------------------------   --------------------------------
     Cumulative translation adjustment       316,000           9,000          255,000          182,000
     Unrealized gain on
       available-for-sale
       securities (net of taxes of
       $911,000 and $922,000)              1,620,000            ----        1,640,000             ----
                                        ---------------------------------  ---------------------------------
      Comprehensive income              $    466,000     $ 1,078,000      $ 2,368,000      $ 6,687,000
                                        ================================= ==================================
</TABLE>

6.  SEGMENT DATA

     Segment   information   included  under  the  caption   "Segment  Data"  in
Management's  Discussion  and  Analysis of  Financial  Condition  and Results of
Operations is incorporated  herein by reference and is an integral part of these
unaudited interim financial statements.

7.  Merger and Acquisition

     On  May 5,  1999,  pursuant  to a  Merger  Agreement,  the  Company  issued
approximately  0.2 million shares of its common stock in exchange for all of the
ownership  interests of TeloSense.  TeloSense  manufactures  and sells toxic gas
sensors and gas monitoring systems used in the semiconductor industry.

     On May 31, 1999,  pursuant to an Agreement and Plan of Merger,  the Company
issued  approximately 2.4 million shares of its common stock in exchange for all
of the ownership  interests of Delatech.  Delatech  manufactures and distributes
environmental gas abatement equipment used in the semiconductor industry.

     Also on May 31,  1999,  pursuant to an  Agreement  and Plan of Merger,  the
Company issued  approximately 1.2 million shares of its common stock in exchange
for all of the ownership interests of ACSI. ACSI manufacturers, distributes, and
sells specialty chemicals to integrated circuit manufacturers.

     The former  securityholders  of ACSI and Delatech  have agreed to indemnify
the  Company  from  and  against   certain  losses  arising  out  of  breach  of
representations  and  warranties  made  by the  respective  securityholders.  As
security for these obligations,  the former securityholders of ACSI and Delatech
delivered into escrow  approximately  0.1 million and  approximately 0.2 million
shares,  respectively,  of the  Company's  common  stock which they  received in
connection with these acquisitions.

     Merger and related costs of approximately $6.8 million include $2.4 million
of investment  banker fees,  legal and  accounting  fees recorded in the quarter
ended June 30,1999 in connection with the  investigation,  analysis and May 1999
closings of the TeloSense,  Delatech, and ACSI transactions.  The acquisition of
Delatech  also  resulted in a charge of $4.4 million to  recognize  the impaired
value of certain  inventory ($1 million) and goodwill ($3.4 million)  associated
with existing  EcoSys product  lines.  These charges were based on the estimated
shortfall of future cash flows on a discounted basis.

     The acquisitions of TeloSense, ACSI and Delatech were treated as pooling of
interests. Both TeloSense's and Delatech's fiscal year ended on November 30. The
financial  statements  have been restated to combine  TeloSense's and Delatech's
fiscal year-end and ACSI's and ATMI's  year-end.  Certain  adjustments have been
made to the financial  statements to combine their operations.  An adjustment of
$163,000 was made, in the six months ended June 30, 1999,  to retained  earnings
to adjust for the different fiscal year ends. The following represents unaudited
results of operations of the Company and the merger entities of TeloSense,  ACSI
and Delatech for the three months ended March 31, 1999 and 1998:

<TABLE>
<CAPTION>
                                     Three Months Ended      Three Months Ended
                                       March 31, 1999          March 31, 1998
                                     ------------------      ------------------
<S>                                     <C>                        <C>
Revenues:
  ATMI                                  $ 24,029,000               $ 30,534,000
  TeloSense, ACSI and Delatech          $  8,535,000               $ 16,102,000

Net Income:
  ATMI                                  $  1,992,000               $  4,565,000
  TeloSense, ACSI and Delatech          $    (49,000)              $    871,000
</TABLE>

     Item 2.  Management's  Discussion  and Analysis of Financial  Condition and
Results of Operations

OVERVIEW

     ATMI,  Inc. is a leading  supplier of thin film materials,  equipment,  and
services used worldwide in the manufacture of semiconductor devices. The Company
targets high growth  consumable and equipment  markets within the  semiconductor
industry with proprietary and patented products. The Company currently provides:
(i) a broad range of  ultrahigh-purity  thin film materials and related delivery
systems; (ii) a full line of point-of-use semiconductor  environmental equipment
and services; and (iii) specialty epitaxial thin film deposition services.  Over
the last four years,  the Company has achieved a leadership  position in each of
its target  markets by  providing  a more  complete  line of  products  than its
competitors.  ATMI's  strategy is to continue  its growth  through  product line
expansion in each of its existing markets and to leverage its core technology to
create new high growth businesses. The Company has grown in recent years through
strategic  acquisitions  in its  target  markets.  Management's  Discussion  and
Analysis of  Financial  Condition  and Results of  Operations  give  retroactive
effect to the  acquisitions  of ACSI,  Delatech,  and TeloSense  which have been
accounted for using the pooling of interests method.

     ATMI  has  capitalized  on the  growth  of the  semiconductor  industry  by
providing leading edge products and services in each of its target markets.  The
Company has organized its operations along two business segments--ATMI Materials
and ATMI Technologies.

     ATMI's  Materials  segment consists of the ADCS,  NovaSource,  ACSI and NOW
divisions.  ADCS develops and markets  ultrahigh-purity  thin film materials and
proprietary  delivery systems.  NovaSource  develops and markets Safety Delivery
Source ("SDS"),  which stores dangerous gases as solids in cylinders,  providing
increased  safety  and  substantially  greater  operating   efficiencies.   ACSI
manufacturers  and markets  specialty  materials  used in  photolithography  and
chemical  mechanical  processing  steps  in  semiconductor  manufacturing.   NOW
manufactures  high  performance  containers and dispensing  systems for advanced
purity chemicals used in the manufacture of microelectronics.

     ATMI's Technologies segment consists of the EcoSys, Epitronics, Emosyn, and
Ventures divisions. The Company believes EcoSys, particularly after the May 1999
acquisitions  of Delatech and  TeloSense,  is the only provider of  point-of-use
environmental  equipment  offering all of the key technologies for semiconductor
effluent abatement and monitoring.  The Company's Epitronics division is a world
leader in specialty epitaxial  services,  providing  high-quality  processing of
silicon and next-generation  III-V and wide bandgap wafers. The Company's Emosyn
division  is  bringing  to market a new  generation  of  semiconductor  devices,
initially targeted at the high growth market for smart card integrated circuits.
ATMI  participates in United States  government-funded  research and development
contracts through its Ventures division.

     The following table sets forth,  for the periods  indicated,  certain items
from the Company's consolidated statement of income expressed as a percentage of
total revenues:

<TABLE>
<CAPTION>
                                      Three Months Ended    Six Months Ended
                                            June 30,             June 30,
                                       1999       1998       1999       1998
                                       ----       ----       ----       ----
<S>                                   <C>        <C>        <C>        <C>
Revenues                              100.0%     100.0%     100.0%     100.0%
Cost of revenues                       48.6       54.3       49.1       49.4
                                       -----     -----       -----      -----
Gross profit                           51.4       45.7       50.9       50.6
  Research and                          9.6       11.0       10.2        9.2
    development
  Selling, general
    and administrative                 28.7       31.6       30.2       29.9
  Merger and related costs             15.8        0.0        9.0        0.0
                                       -----      -----      -----      -----
      Total operating expenses         54.1       42.6       49.4       39.1
                                       -----      -----      -----      -----
Operating income (loss)                (2.7)       3.1        1.5       11.5
Other income (expense), net             1.8        2.2        2.1        1.1
                                       -----      -----      -----      -----
Income (loss) before taxes and
  minority interest                    (0.9)       5.3        3.6       12.6
Provision for income taxes              2.3        2.4        2.9        4.7
                                       -----      -----      -----      -----
Income (loss) before minority
  interest                             (3.2)       2.9        0.7        7.9
Minority interest                      (0.2)       0.0       (0.1)      (0.1)
                                       =====      =====      =====      =====
Net income (loss)                      (3.4)%      2.9%       0.6%       7.8%
                                       =====      =====      =====      =====
</TABLE>

RESULTS OF OPERATIONS

Three Months Ended June 30, 1999 and 1998

     Revenues.  Revenues  increased  16.5% to  approximately  $42,976,000 in the
three  months  ended June 30, 1999 from  approximately  $36,905,000  in the same
three month period in 1998. The revenue  increase was primarily  attributable to
the improved market  conditions for  semiconductor  materials as compared to the
second  quarter of 1998.  This market  improvement  was primarily  driven by the
increase in semiconductor wafer starts and semiconductor unit demand in the 1999
period. ATMI's consumable products, most notably SDS, NOW packaging products and
ADCS chemical products, showed strong volume growth during the second quarter of
1999.

     Gross Profit. Gross profit increased 30.9% to approximately  $22,092,000 in
the quarter ended June 30, 1999 from  approximately  $16,879,000  in the quarter
ended June 30, 1998.  As a percentage  of  revenues,  gross margin  increased to
51.4% in the three  month  period in 1999 from  45.7% of  revenues  in the three
month period in 1998. This was due principally to an increase in revenues in the
Materials  segment,  where  increased  revenues in higher  margin  product lines
caused a more favorable product mix. The increase in revenue volumes also led to
more effective fixed cost absorption and thus, increased margins.

     Research  and  Development  Expenses.  Research  and  development  expenses
increased  1.5% to  approximately  $4,109,000  in the first three months of 1999
from approximately $4,050,000 in the first three months of 1998. The increase in
the second  quarter of 1999 was primarily due to continued  application-specific
product development efforts within Emosyn. As a percentage of revenues, research
and development expenses decreased to 9.6% in the 1999 quarter from 11.0% in the
1998 quarter.

     Selling,  General  and  Administrative   Expenses.   Selling,  general  and
administrative expenses increased 6.0% to approximately $12,355,000 in the three
months  ended June 30,  1999 from  approximately  $11,661,000  in the same three
month  period in 1998.  The increase in the 1999  quarter was  primarily  due to
increased  selling  costs  related  to  commissions,  which  were  caused by the
increase in revenues in the Materials  segment,  and  additional  infrastructure
needed for the continued growth of the businesses.  As a percentage of revenues,
these  expenses  decreased to 28.7% in the three month period in 1999 from 31.6%
in the comparable period in 1998.

     Merger and  Related  Costs.  The second  quarter  1999  operating  results,
include  merger  and  related  costs  of  approximately   $6,800,000   including
$2,400,000  of  investment  banker,  legal and  accounting  fees recorded in the
quarter ended June 30, 1999 in connection with the  investigation,  analysis and
May  1999  closings  of the  TeloSense,  Delatech,  and ACSI  transactions.  The
acquisition of Delatech also resulted in a $4,400,000  asset  impairment  charge
for inventory  ($1,000,000)  and goodwill  ($3,400,000)  associated with certain
existing  EcoSys product lines which were determined to be impaired based on the
Company's assessment of estimated net cash flows from such product lines.

     Other Income, Net. Other income,  net, decreased to approximately  $786,000
in the quarter  ended June 30,  1999 from other  income,  net, of  approximately
$801,000 in the quarter  ended June 30,  1998.  The decrease in the 1999 quarter
related to a decline in interest income levels as compared to 1998. The interest
income  declined due to lower levels of cash and lower interest rates during the
second quarter of 1999 compared to 1998.

     Income  Taxes.  Income tax expense in the  quarter  ended June 30, 1999 was
$1,002,000 which was an increase from $887,000 for the same quarter in 1998. The
differences  between  the  consolidated  effective  income tax rate and the U.S.
Federal  statutory  rate are primarily  attributed to state income taxes and the
effects of certain non-deductible merger related costs.

     Earnings  per  Share.  On  a  pro-forma  basis,   excluding  the  after-tax
$5,459,000 charge related to acquisitions closed during the quarter,  net income
improved to $3,989,000,  or $0.15 per diluted share compared with  $1,069,000 or
$0.04 per diluted  share,  a year ago.  Earnings  per  share-assuming  dilution,
including the merger and related cost charge, declined to $(0.06) for the second
quarter  of 1999.  Earnings  per  share-assuming  dilution  in the  1999  period
reflects  a  4.9%  decrease  in  weighted   average  shares   outstanding   from
approximately  26,295,000  in  the  second  quarter  of  1998  to  approximately
25,013,000 in the second quarter of 1999.

Six Months Ended June 30, 1999 and 1998

     Revenues. Total revenues decreased 9.6% to approximately $75,540,000 in the
six months ended June 30, 1999 from approximately $83,541,000 in the same period
in 1998. Despite  sequential revenue growth in the second quarter,  year-to-date
revenues are below 1998 levels.  While the industry has shown  significant signs
of recovery, the market, particularly for equipment products has not returned to
the levels  experienced  during  early 1998.  The overall  decline was offset by
growth in the Material  segment as compared to the first six months of 1998. The
gains in the Materials  segment  relate to the Company's SDS, NOW dispensing and
packaging products and ADCS chemical product lines.

     Gross Profit.  Gross profit decreased 9.0% to approximately  $38,435,000 in
the six months  ended June 30, 1999 from  approximately  $42,249,000  in the six
months ended June 30, 1998. As a percentage of revenues,  gross margin increased
to 50.9% in the first half of 1999 from 50.6% of  revenues in the same period in
1998. This increase was due principally to margin gains related to the increased
sales of NOW dispensing and packaging system.

     Research  and  Development  Expenses.  Research  and  development  expenses
increased 0.5% to approximately  $7,704,000 in the first six months of 1999 from
approximately  $7,667,000 in the first six months of 1998.  Increased efforts to
expand SDS technology  beyond ion implant  applications into CVD, etch, and bulk
gas delivery,  and continued  product  development  activities within the Emosyn
business were offset by reduced R&D spending  within EcoSys.  As a percentage of
revenues, research and development expenses increased to 10.2% in the first half
of 1999 from 9.2% in the first half of 1998.

     Selling,  General  and  Administrative   Expenses.   Selling,  general  and
administrative expenses decreased 8.8% to approximately  $22,810,000 for the six
months ended June 30, 1999 from approximately  $25,020,000 in the same period in
1998.   The  decrease  in  the  1999  period  was  primarily  due  to  decreased
administrative  costs  and  decreased  commissions  on  lower  product  revenues
primarily at EcoSys.  As a  percentage  of revenues,  these  expenses  increased
slightly to 30.2% in the first half of 1999 from 29.9% in the comparable  period
in 1998.

     Merger and Related  Costs.  During the second  quarter of 1999, the Company
recorded  merger  and  related  costs  of  approximately   $6,800,000  including
$2,400,000  of  investment  banker,  legal and  accounting  fees recorded in the
quarter ended June 30, 1999 in connection with the  investigation,  analysis and
May  1999  closings  of the  TeloSense,  Delatech,  and ACSI  transactions.  The
acquisition of Delatech also resulted in a $4,400,000  asset  impairment  charge
for inventory  ($1,000,000)  and goodwill  ($3,400,000)  associated with certain
existing  EcoSys product lines which were determined to be impaired based on the
Company's assessment of estimated net cash flows from such product lines.

     Other Income, Net. Other income, net, increased to approximately $1,631,000
for the six months  ended June 30, 1999 from  $932,000  for the six months ended
June 30, 1998. The increase in the 1999 period related to a significant increase
in interest income due to increased cash levels on hand during the first quarter
of 1999  compared  to the first  quarter of 1998.  These  increased  cash levels
resulted  from the public  offering  that was  completed at the beginning of the
second quarter in 1998.

     Income Taxes. Income tax expense for the six months ended June 30, 1999 was
$2,198,000,  which was an decrease from $3,921,000 for the same six month period
in 1998. The differences between the consolidated  effective income tax rate and
the U.S. Federal  statutory rate are primarily  attributed to state income taxes
and the effects of certain non-deductible merger related costs.

     Earnings  per  Share.  On  a  pro-forma  basis,   excluding  the  after-tax
$5,459,000 charge related to acquisitions  closed during the first six months of
1999,  net income  improved to  $5,932,000,  or $0.22 per diluted share compared
with $6,505,000 or $0.26 per diluted share for the same period in 1998. Earnings
per share-assuming dilution, including the merger charge, decreased to $0.02 for
the six months ended June 30, 1999. Earnings per share-assuming  dilution in the
1999 period reflects a 5.0% increase in weighted  average shares  outstanding to
approximately  26,520,000  in the  first six  months of 1999 from  approximately
25,248,000 in the first six months of 1998.

SEGMENT DATA

     ATMI has two segments-  ATMI Materials and ATMI  Technologies.  The Company
evaluates performance and allocates resources based on operating profit or loss,
not  including  interest  and other  income or  expense  and income  taxes.  The
accounting  policies of the reportable  segments are more fully described in the
Company's Annual Report on Form 10-K for the year ended December 31, 1998.

     The following  tables provide  reported  results for each of these segments
for the three and six months ended June 30:

<TABLE>
<CAPTION>
                                   Three Months Ended                   Six Months Ended
                                 1999              1998             1999           1998
                             ------------     ------------     ------------    ------------
<S>                          <C>              <C>              <C>             <C>
Revenues
ATMI Materials               $ 22,315,000     $ 16,878,000     $ 40,199,000    $ 36,340,000
ATMI Technologies              20,661,000       20,027,000       35,341,000      47,201,000
                             ============     ============     ============    ============
Consolidated Revenues        $ 42,976,000     $ 36,905,000     $ 75,540,000    $ 83,541,000
                             ============     ============     ============    ============
</TABLE>
<TABLE>
<CAPTION>
                                   Three Months Ended                   Six Months Ended
                                 1999              1998             1999           1998
                             ------------     ------------     ------------    ------------
<S>                          <C>              <C>              <C>             <C>
Operating Income (Loss)
ATMI Materials               $  5,122,000     $  2,638,000     $  9,027,000    $  7,041,000
ATMI Technologies               1,672,000         (617,000)         986,000       3,845,000
Merger and Related Costs       (6,800,000)            --         (6,800,000)          --
Corporate                      (1,166,000)        (853,000)      (2,092,000)     (1,324,000)
                             ------------     -------------    -------------    ------------
Consolidated Operating
Income (Loss)                $ (1,172,000)    $  1,168,000     $  1,121,000    $  9,562,000
                             =============    =============    =============   ============
</TABLE>
<TABLE>
<CAPTION>
                                   Three Months Ended                   Six Months Ended
Net Income (Loss)                1999              1998             1999           1998
                             -------------    ------------     ------------     ------------
<S>                          <C>                 <C>           <C>             <C>
Operating Income (Loss) from
Reportable Segments          $ (1,172,000)       1,168,000     $  1,121,000    $  9,562,000
Other Income                      704,000          788,000        1,550,000         864,000
Income Taxes                   (1,002,000)        (887,000)      (2,198,000)    (3,921,000)
                             -------------    ------------     -------------    -----------
Consolidated Net Income
  (Loss)
                             $ (1,470,000)       1,069,000     $    473,000    $  6,505,000
                             ============     ============     ============    ============
</TABLE>

     The following  table provides  reported  balance sheet data for each of the
segments at June 30, 1999 and at December 31, 1998:

<TABLE>
<CAPTION>
Identifiable Assets                       1999                 1998
                                          ----                 ----
<S>                                <C>                    <C>
ATMI Materials                     $   45,945,000         $  39,534,000
ATMI Technologies                      62,230,000            61,037,000
General Corporate Assets               83,261,000            87,623,000
                                   ==============          ============
Total Consolidated Assets          $  191,436,000         $ 188,194,000
                                   ==============          ============
</TABLE>

BUSINESS SEGMENTS RESULTS

ATMI Materials

     Revenues in the Materials  segment for the three months ended June 30, 1999
increased 32% from 1998 levels. An increase in semiconductor  unit demand during
the quarter led to a significant  increase in sales of ATMI  Materials'  product
sales.  The 1999  second  quarter  growth in  Materials  was spurred by stronger
industry conditions and increased market penetration particularly related to the
SDS and NOW  product  lines.  For the six months  ended June 30,  1999  revenues
increased 11% from 1998 levels.  This increase  reflects  market share gains for
several of ATMI Materials' product lines.

     Operating income in the Materials segment improved 94% for the three months
ended June 30, 1999 from the same period in 1998.  The revenue  increase in 1999
combined with strong margins and cost  containment  initiatives  drove operating
income  to  significant  gains  within  the  segment.  Operating  income,  as  a
percentage of revenues, was 23% and 16% for the three months ended June 30, 1999
and 1998, respectively.  For the six months ended June 30, 1999 operating income
levels increased 28% from 1998 levels. This increase reflects the gains made due
to the improved market  conditions  within the industry  during 1999.  Operating
income,  as a percentage  of revenues,  was 23% and 19% for the six months ended
June 30, 1999 and 1998, respectively.

ATMI Technologies

     Revenues  in  the  Technologies  segment  in the  second  quarter  of  1999
increased  3% from  second  quarter  1998  levels.  Semiconductor  manufacturing
capacity expansion has begun to improve from depressed 1998 levels. This has led
to an  improvement  in sales at  EcoSys  (including  Delatech)  and  Epitronics.
Although signs of a steady  recovery have emerged in the first six months of the
year 1999, revenue levels are still trailing first half of 1998 revenues by 25%.

     Operating income within the  Technologies  segment improved to $1.7 million
in the second  quarter of 1999 compared to an operating loss of $0.6 million for
the same period in 1998. The income increase was attributable to the improvement
in both EcoSys' and Epitronics  product  margins due to a favorable  product mix
shift and an improvement in profitability of various contract programs.  For the
six months ended June 30, 1999 operating  income  declined 74% from 1998 levels.
This resulted from a significant  decrease in profitability in the first quarter
of 1999 compared to 1998 levels.

Corporate

     Corporate  expenses  increased 37% for the three months ended June 30, 1999
compared to the same period in 1998. The increase resulted  primarily because of
additional general and administrative  support due to the growth of the Company.
The  increase  in the  business  of the  Company,  driven by  acquisitions,  has
required additional corporate  infrastructure.  Additionally,  in late 1998, the
Company  began  implementing  an ERP  system,  which has led to an  increase  in
consultant and planning  expenses.  Corporate expenses increased 58% for the six
months ended June 30, 1999 compared to the same period in 1998.

     Corporate  identifiable  assets  consist  primarily of cash and  marketable
securities.

Liquidity and Capital Resources

     To date,  the  Company  has  financed  its  activities  through the sale of
equity, its operations, external research and development funding, various lease
and debt instruments.  The Company's working capital increased to $106.3 million
at June 30, 1999 from $100.0 million at December 31, 1998.

     Net cash provided by operations was  approximately  $8.1 million during the
six months ended June 30, 1999, resulting primarily from improvements in working
capital, as compared to cash provided from operations of $4.7 million during the
same six month period of 1998. The  improvement in working capital was primarily
caused by a decrease in other assets, and increases in accounts payable, accrued
expenses,  and other  liabilities.  The $6.8 million of merger and related costs
expensed in the second quarter of 1999,  reduced cash generated from  operations
by  approximately  $2.0 million  during the period ended June 30, 1999. In 1998,
operations provided cash of $6.5 million, offset by a decline in working capital
related to  increases  in  inventory,  other  assets and  decreases  in accounts
payable and accrued expenses.

     The Company utilized  approximately $1.0 million in cash for the six months
ended June 30, 1999 in investing  activities  compared to a use of approximately
$63.0  million  in cash for the same  period a year  ago.  During  the first six
months of 1999, cash was used for the purchase of approximately  $3.9 million in
capital  equipment  to  support  continued  growth  at  the  Company's  existing
manufacturing facilities. During the first six months of 1998, cash was used for
the  purchase of  approximately  $6.6  million in capital  equipment,  primarily
related  to  installation  of  additional  manufacturing  capacity  in  Danbury,
Connecticut and at the ADCS manufacturing facilities in Burnet, Texas as well as
the purchase of epitaxial reactors for Epitronics.  Additionally, in April 1998,
the Company  completed a registered  underwritten  public  offering of 5,428,000
shares of its common stock. Of such shares,  2,257,291 shares were sold by ATMI,
and 3,170,709  shares were sold by certain  stockholders  of ATMI. ATMI received
net proceeds from the offering  including  exercise by the  underwriters  of the
over-allotment   of   approximately   $62.4   million.   The  Company   invested
approximately  $56.5 million of the proceeds  raised from the sale of its common
stock into  marketable  securities for future working capital  requirements  and
potential merger and acquisition activities.

     As of June 30, 1999, ATMI has financed a significant portion of its capital
equipment  purchases,  particularly  the  silicon  epitaxial  capacity,  through
capital leases with approximately $5.0 of capital lease obligations outstanding.
During the first six  months of 1999 and 1998,  the  Company  made  payments  on
capital  leases of  approximately  $1.2 million and $1.6 million,  respectively.
Financial  institutions  have  also  provided  collateral-based  loans for other
equipment purchases. The Company has also entered into various note arrangements
to  finance  the  purchase  of key  product  lines  and other  expansion  of its
businesses.  In the first six months of 1999 and 1998, the Company made payments
on notes of  approximately  $5.6  million and $0.3  million,  respectively.  The
Company's NOW business has an industrial revenue bond arrangement outstanding in
the amount of $2.5 million, which was used for the equipment and improvements at
its manufacturing  facility and corporate office. At June 30, 1999, $6.0 million
of loans, bonds and financing remained  outstanding.  In the first six months of
1998, the Company generated approximately $62.4 million from the completion of a
public  offering.  Management  believes that is debt service  obligations can be
adequately satisfied by cash flows from operations.

     ATMI  believes  its  existing  cash  balances  and  marketable  securities,
existing  sources of  liquidity  and  anticipated  funds from  operations,  will
satisfy its projected  working  capital and other cash  requirements  through at
least the end of 2000.  However,  ATMI believes the level of financing resources
available to it is an important  competitive factor in its industry and may seek
additional  capital  prior  to  the  end  of  that  period.  Additionally,  ATMI
considers,  on a continuing  basis,  potential  acquisitions of technologies and
businesses  complementary  to its  current  business.

YEAR 2000 COMPLIANCE

     ATMI has an internal  compliance team to evaluate its internal  information
technology  infrastructure  and  application  systems ("IT  Systems")  and other
non-IT  infrastructure  systems  ("Non-IT  Systems") to  determine  whether such
systems will operate correctly with regard to the import, export, and processing
of date  information,  including  correct  handling of leap years, in connection
with the change in the calendar  year from 1999 to 2000 (the "Year 2000 Issue"),
and to evaluate  the Year 2000 Issue with  respect to the systems of third party
partners  and  suppliers  with which the  Company  has a  material  relationship
("Third Party Systems").

     ATMI conducted an IT Systems inventory analysis and risk assessment and has
recently completed upgrades of core IT Systems to incorporate additional desired
features and functionality  including Year 2000 compliant operators. As a result
of such  upgrades,  the  Company  believes  its core IT  Systems  are Year  2000
compliant.  The Company does not expect that any additional  costs of addressing
the Year 2000 Issue for its IT Systems  will have a material  adverse  impact on
the Company's financial position, results of operations or cash flows.

     ATMI has  also  completed  a  Non-IT  System  inventory  analysis  and risk
assessment.  As  a  result  of  the  analysis,  the  Company  believes  that  no
remediation  actions are  required in order to be Year 2000  compliant.  Because
ATMI believes the number of Non-IT  Systems is relatively  small,  ATMI does not
expect that any  additional  costs of addressing  the Year 2000 Issue for Non-IT
Systems will have a material  adverse  impact on its operations or its financial
position, results of operations or cash flows.

     ATMI has completed  its Third Party  inventory  and risk  assessment.  As a
result of the analysis, the Company believes that no other actions are necessary
in order to be Year 2000 compliant.  However,  ATMI still believes that its most
reasonably  likely  worst-case  Year 2000  scenarios  would  involve Third Party
Systems rather than its internal systems. The Company believes that its greatest
risks  would be the  partial or  complete  shutdown  of a critical  supplier  or
strategic partner and its inability to provide critical supplies and services to
the Company on a timely basis. A contingency  plan addressing  potential  issues
related to Third Party Systems has been developed. The contingency plan consists
of  ensuring  adequate  levels  of  critical  supplies  used  in  the  Company's
manufacturing  processes  are on hand at the end of year 1999.  The  Company has
also compiled a listing of manufacturers  of alternative  supply sources for its
critical products.  In the event a third party supplier is affected by Year 2000
issues,  the Company will make arrangements  with alternative  suppliers for its
critical raw materials.

     ATMI has tested its products for Year 2000  compliance  and has  determined
that all ATMI products  currently  available  for sale have either  successfully
passed Year 2000  compliance  testing or are not subject to Year 2000 compliance
because such products do not import,  export, or process date information in any
manner.

     To date,  the  Company  has  incurred  approximately  $585,000  of  expense
relating to inventory analysis and risk assessment.  The funds to cover the cost
incurred to date were  derived  from  general  operations.  The costs  primarily
relate to desktop compliance and standardization to Year 2000 compliance.  These
Year 2000 expenditures are within the Company's planned  operational budgets and
include the cost of reviewing key operating systems.  As of June 30, 1999, no IT
Systems projects have been deferred because of problems associated with the Year
2000 Issue.

FORWARD-LOOKING STATEMENTS

     The  statements  contained  in this  report  which are not  historical  are
"forward-looking statements" within the meaning of Section 27A of the Securities
Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934,
as amended. Examples of forward-looking  statements include, without limitation,
statements by ATMI regarding financial projections,  expectations for demand and
sales  of new  and  existing  products,  market  and  technology  opportunities,
business strategies, business opportunities, objectives of management for future
operations,  semiconductor  industry  and market  segment  growth and efforts to
achieve Year 2000 compliance.  In addition,  when used in this report, the words
"anticipate," "plan," "believe," "estimate," "expect" and similar expressions as
they  relate  to  the  Company  or  its  management  are  intended  to  identify
forward-looking  statements.  All  forward-looking  statements involve risks and
uncertainties.  Actual results may differ materially from those discussed in, or
implied  by,  the  forward-looking  statements  as a result of  certain  factors
including,  but not limited to, changes in the pattern of semiconductor industry
growth,  the markets for or customer  interest in the products of ATMI,  product
and  market   competition,   delays  or   problems   in  the   development   and
commercialization of products,  technological changes affecting the competencies
of ATMI and  unanticipated  internal  and/or  third party  delays or failures in
achieving Year 2000  compliance.  The cautionary  statements made in this report
should be read as being  applicable  to all related  forward-looking  statements
wherever they appear in this report.

Item 3.  Quantitative and Qualitative Disclosures about Market Risk

     Market risks  relating to the Company's  operations  result  primarily from
changes in interest  rates and foreign  exchange  rates,  as well as credit risk
concentrations.  The  Company's  customer  base  is  composed  of  semiconductor
manufacturers  that are located  throughout  the United  States,  Europe and the
Pacific Rim. There is no single  geographic area of  concentration in the United
States,  Europe or the  Pacific  Rim.  The  Company's  market  risks  related to
interest and foreign exchange rates are not material to its operating results.

PART II-  OTHER INFORMATION

Item 2.    Changes in Securities and Use of Proceeds

     On May 5, 1999, the Company issued to the former  stockholders of TeloSense
an  aggregate  of 231,594  shares of its  common  stock in  connection  with the
acquisition  of  TeloSense.  On May 31, 1999,  the Company  issued to the former
stockholders of Delatech an aggregate of 2,347,499 shares of its common stock in
connection with the acquisition of Delatech.  On May 5, 1999, the Company issued
to the former  stockholders  of ACSI an  aggregate  of  1,202,312  shares of its
common stock in  connection  with the  acquisition  of ACSI.  In each case,  the
issued shares were not  registered  under the Securities Act of 1933, as amended
(the "Act"), in reliance on the exemption from registration  provided by Section
4(2) of the Act.

Item 4.    Submission of Matters to a Vote of Security Holders.

     The Annual Meeting of the  Stockholders  of the Company was held on May 26,
1999. At the annual meeting,  the stockholders  elected the following persons to
the Board of Directors of the Company:  Eugene Banucci,  Mark Adley and Kam Law.
There were  19,347,306  votes for and 18,435 votes  withheld for Dr. Banucci and
19,346,806  votes for and 18,935  votes  withheld for Mr. Adley and Mr. Law. All
individuals  were elected for a term that expires at the 2002 Annual  Meeting of
Stockholders.

     The stockholders also ratified the appointment by the Board of Directors of
Ernst & Young LLP as the  Company's  independent  auditors  for the fiscal  year
ending December 31, 1999. There were 19,340,917  votes for, 22,762 against,  and
2,062 abstentions with respect to such ratification.

Item 6.  Exhibits and Reports on Form 8-K.

a. Exhibits.

    Exhibit No.                                 Description

     2.01  Agreement  and Plan of Merger  dated as of May 31,  1999 by and among
           Advanced Chemical Systems  International,  Inc., ATMI, Inc. and Strip
           Acquisition  Corp. (Filed as  Exhibit 2.1 to  Current Report on  Form
           8-K/A  dated  May 31, 1999,  File  No. 0-30130, and  incorporated  by
           reference herein.)

     2.02  Agreement  and Plan of  Merger dated as of May 31,  1999 by and among
           Delatech  Incorporated, ATMI,  Inc. and Napa  Acquisition  Corp.  and
           certain shareholders of Delatech  Incorporated. (Filed as Exhibit 2.2
           to Current Report on Form 8-K/A dated May 31, 1999, File No. 0-30130,
           and incorporated by reference herein.)

    27.01  Financial Data Schedule (Filed herewith)

b. Reports on Form 8-K.

         On June 15, 1999,  the Company filed a Current Report on Form 8-K dated
May 31, 1999 reporting in Item 2 thereof the  acquisitions of ACSI and Delatech.
On July 1, 1999,  the Company filed a Current Report on Form 8-K/A dated May 31,
1999 to include supplemental  selected financial data,  management's  discussion
and analysis of financial  condition and results of operations and  supplemental
consolidated  financial statements of ATMI (in each case, as restated to reflect
the acquisitions of ACSI and Delatech).
<PAGE>



                                                    SIGNATURES

     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.

                                                          ATMI, Inc.

August 13, 1999

                                                By _____________________________
                                                       Eugene G. Banucci, Ph.D.,
                                 President, Chief Executive Officer, Chairman of
                                                          the Board and Director


                                                By _____________________________
                              Daniel P. Sharkey, Vice President, Chief Financial
                                Officer and Treasurer (Chief Accounting Officer)
<PAGE>


                                                    SIGNATURES

     Pursuant to the  requirements  of the Securities  Exchange Act of 1934, the
registrant  has duly  caused  this  report  to be  signed  on its  behalf by the
undersigned thereunto duly authorized.

                                   ATMI, Inc.

August 13, 1999
By                                            /S/ Eugene G. Banucci_____________
                                                       Eugene G. Banucci, Ph.D.,
                                 President, Chief Executive Officer, Chairman of
                                                          the Board and Director




                                        By _______/S/ Daniel P. Sharkey_________
                              Daniel P. Sharkey, Vice President, Chief Financial
                                Officer and Treasurer (Chief Accounting Officer)

<PAGE>

                                  EXHIBIT INDEX


    Exhibit No.                                 Description

      2.01           Agreement  and  Plan  of  Merger  dated  as of May 31, 1999
                     by and among Advanced Chemical Systems International, Inc.,
                     ATMI, Inc. and Strip Acquisition Corp.(Filed as Exhibit 2.1
                     to Current Report on  Form 8-K/A dated  May 31, 1999,  File
                     No. 0-30130, and incorporated by reference herein.)

      2.02           Agreement  and Plan of Merger  dated as of May 31,  1999 by
                     and  among  Delatech  Incorporated,  ATMI,  Inc.  and  Napa
                     Acquisition  Corp.  and  certain  shareholders  of Delatech
                     Incorporated.  (Filed as Exhibit  2.2 to Current  Report on
                     Form  8-K/A  dated  May 31,  1999,  File No.  0-30130,  and
                     incorporated by reference herein.)

     27.01           Financial Data Schedule (Filed herewith)

<TABLE> <S> <C>

<ARTICLE>                     5
<MULTIPLIER>               1000

<S>                         <C>                               <C>
<PERIOD-TYPE>               6-MOS                             6-MOS
<FISCAL-YEAR-END>           Dec-31-1999                       Dec-31-1998
<PERIOD-END>                Jun-30-1999                       Jun-30-1998
<CASH>                      22427                             17668
<SECURITIES>                64262                             73901
<RECEIVABLES>               28754<F1>                         27011<F1>
<ALLOWANCES>                0                                 0
<INVENTORY>                 15666                             17486
<CURRENT-ASSETS>            137104                            143744
<PP&E>                      49383<F2>                         47730<F2>
<DEPRECIATION>              0                                 0
<TOTAL-ASSETS>              191436                            198379
<CURRENT-LIABILITIES>       30772                             29492
<BONDS>                     2500                              2900
       0                                 0
                 0                                 0
<COMMON>                    261                               259
<OTHER-SE>                  149493                            147246
<TOTAL-LIABILITY-AND-EQUITY>191436                            198379
<SALES>                     75540                             83541
<TOTAL-REVENUES>            75540                             83541
<CGS>                       37105                             41292
<TOTAL-COSTS>               37105                             41292
<OTHER-EXPENSES>            7704<F3>                          7667<F3>
<LOSS-PROVISION>            0                                 0
<INTEREST-EXPENSE>          451                               861
<INCOME-PRETAX>             2671                              10426
<INCOME-TAX>                2198                              3921
<INCOME-CONTINUING>         0                                 0
<DISCONTINUED>              0                                 0
<EXTRAORDINARY>             0                                 0
<CHANGES>                   0                                 0
<NET-INCOME>                473                               6505
<EPS-BASIC>               .02                               .28
<EPS-DILUTED>               .02                               .26
<FN>
<F1>Net of  allowance  for doubtful  accounts,  consistent  with  balance  sheet
presentation.
<F2>Net of accumulated depreciation, consistent with balance sheet
presentation.
<F3>Research and development expenses
</FN>


</TABLE>


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