FORM 6-K

                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                        Report of Foreign Private Issuer

                      Pursuant to Rule 13a-16 or 15d-16 of
                       the Securities Exchange Act of 1934


                                QUARTERLY REPORT


                  For the quarterly period ended June 30, 2004


                               INFICON Holding AG


                              INFICON Holding Inc.
                 (Translation of Registrant's Name Into English)

                                  INFICON Inc.
                              Two Technology Place
                          East Syracuse, New York 13057
                    (Address of Principal Executive Offices)


(Indicate by check mark whether the registrant files or will file annual reports
under cover of Form 20-F or Form 40-F.)

                         Form 20-F |X|   Form 40-F |_|

(Indicate by check mark whether the registrant by furnishing the information
contained in this Form is also thereby furnishing the information to the
Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of
1934.)

                               Yes |_|   No |X|

(If "Yes" is marked, indicate below the file number assigned to the registrant
in connection with Rule 12g3-2(b): 82-  )


                                      -1-


                                Table of Contents

                               INFICON Holding AG

- --------------------------------------------------------------------------------


                                                                                                              
Consolidated Balance Sheets as of June 30, 2004, and December 31, 2003............................................3
Consolidated Statements of Income for the Three and Six-Month Periods Ended June 30, 2004 and June 30, 2003.......4
Consolidated Statements of Cash Flows for the Six-Month Periods Ended June 30, 2004 and June 30, 2003.............6
Condensed notes to consolidated financial statements..............................................................7
Operating and Financial Review and Prospects.....................................................................19
Quantitative and Qualitative Disclosure of Market Risk...........................................................27
Signature........................................................................................................28
Statements Furnished Pursuant to Section 906 of the Sarbanes-Oxley Act of 2002...................................29



                                      -2-


                               INFICON Holding AG
                           Consolidated Balance Sheets
              (U.S. Dollars in thousands, except per share amounts)



                                                                       June 30,    December 31,
                                                                         2004          2003
                                                                      -------------------------
                                                                     (Unaudited)
                                                                               
Assets
Current assets:
     Cash and cash equivalents                                        $  47,963      $  37,074
     Trade accounts receivable, net                                      23,131         22,197
     Accounts receivable - affiliates                                     1,097             94
     Inventories, net                                                    19,848         19,395
     Deferred tax assets, net                                             2,364          3,161
     Other current assets                                                 4,034          2,950
                                                                      ---------      ---------
Total current assets                                                     98,437         84,871

Property, plant and equipment, net                                       21,864         22,398
Intangibles, net                                                          1,112          1,526
Deferred tax assets, net                                                 38,274         39,293
Other assets                                                              2,354          2,586
                                                                      ---------      ---------
Total non-current assets                                                 63,604         65,803

Total assets                                                          $ 162,041      $ 150,674
                                                                      =========      =========

Liabilities and stockholders' equity
Current liabilities:
     Trade accounts payable                                           $   7,198      $   5,918
     Accounts payable - affiliates                                            8            193
     Accrued liabilities                                                 15,273         12,911
     Income taxes payable                                                 1,265            962
     Deferred tax liabilities, net                                          732            545
                                                                      ---------      ---------
Total current liabilities                                                24,476         20,529

Deferred tax liabilities, net                                               491            479
Other liabilities                                                         5,050          3,907
                                                                      ---------      ---------
Total non-current liabilities                                             5,541          4,386

Total liabilities                                                        30,017         24,915

Stockholders' equity:
     Common stock (2,315,800 shares 2004 and 2,315,000 shares 2003
       issued par value CHF 10 (U.S. $5.63)                              13,039         13,033
     Additional paid-in capital                                          94,049         94,024
     Notes receivable from officers                                        (383)          (383)
     Retained earnings                                                   13,541          5,941
     Accumulated other comprehensive income                              11,778         13,144
                                                                      ---------      ---------
Total stockholders' equity                                              132,024        125,759
                                                                      ---------      ---------
Total liabilities and stockholders' equity                            $ 162,041      $ 150,674
                                                                      =========      =========



See condensed notes to consolidated financial statements.


                                      -3-


                               INFICON Holding AG
                        Consolidated Statements of Income
                                   (Unaudited)
              (U.S. Dollars in thousands, except per share amounts)



                                                                    Three Months Ended             Six Months Ended
                                                                         June 30,                      June 30,
                                                              ---------------------------------------------------------
                                                                   2004            2003           2004           2003
                                                              ---------------------------------------------------------

                                                                                                
Net sales                                                     $    49,810    $    36,245    $    97,138     $    75,134

Cost of sales                                                      26,193         20,511         50,919          42,018
                                                              ---------------------------------------------------------
Gross profit                                                       23,617         15,734         46,219          33,116

Research and development                                            4,904          4,361         10,021           8,751

Selling, general and administrative                                13,085         11,642         26,049          22,756
                                                              ---------------------------------------------------------
Operating income (loss) from continuing operations                  5,628           (269)        10,149           1,609

Interest (income), net                                                (18)           (73)            (2)           (162)
Other (income), net                                                  (140)          (427)        (1,128)           (561)
                                                              ---------------------------------------------------------
Income from continuing operations before income taxes               5,786            231         11,279           2,332

Provision (benefit) for income taxes                                1,728           (181)         2,986             365
                                                              ---------------------------------------------------------

Income from continuing operations                                   4,058            412          8,293           1,967

Discontinued Operations (Note 7):
  (Loss) from operations of discontinued Patterning
  Solutions Operations (net of income tax (benefit) of
  $(483) in Q2 2004 and $(583) in Q2 2003 and $(837)
  YTD 2004 and $(1,155) in YTD 2003                                  (267)        (1,972)        (1,179)         (3,484)

  Gain on disposal of Ultra Clean Operations (net of income
  tax provision of $26 in Q2 2004 and $50 YTD 2004)                   290             --            486              --
                                                              ---------------------------------------------------------
Gain (loss) from discontinued operations                               23         (1,972)          (693)         (3,484)
                                                              ---------------------------------------------------------
Net income (loss)                                             $     4,081    $    (1,560)   $     7,600     $    (1,517)
                                                              =========================================================

Earnings (loss) per share:
Diluted:
Continuing operations                                         $      1.74    $      0.18    $      3.55     $      0.85
Discontinued operations                                              0.01          (0.85)         (0.30)          (1.50)
                                                              ---------------------------------------------------------
Total                                                         $      1.75    $     (0.67)   $      3.26*    $     (0.66)*
                                                              =========================================================


                                      -4-


Basic:
Continuing operations                                         $      1.75    $      0.18    $      3.58     $      0.85
Discontinued operations                                              0.01          (0.85)         (0.30)          (1.50)
                                                              ---------------------------------------------------------
Total                                                         $      1.76    $     (0.67)   $      3.28     $     (0.66)*
                                                              =========================================================

*  Figures do not total due to rounding

Denominator for basic and diluted earnings per share:
Weighted average shares outstanding

Basic shares                                                    2,315,574      2,315,000      2,315,345       2,315,000
Diluted shares                                                  2,333,573      2,315,000      2,334,512       2,315,000



See condensed notes to consolidated financial statements.


                                      -5-


                               INFICON Holding AG
                      Consolidated Statements of Cash Flows
                     (Unaudited) (U.S. Dollars in thousands)



                                                                                Six Months Ended
                                                                                     June 30,
                                                                                2004        2003
                                                                             --------------------
                                                                                   
Cash flows from operating activities:
     Net income (loss)                                                       $  7,600    $ (1,517)
     Adjustments to reconcile net income to net cash provided by (used in)
     operating activities:
         Depreciation and amortization                                          2,310       2,087
         Gain on receipt and sale of marketable securities                     (1,038)         --
         Impairment of long-lived assets                                          341          --
         Deferred taxes                                                         1,760        (832)
         Changes in operating assets and liabilities:
           Trade accounts receivable                                           (2,069)       (254)
           Inventories                                                           (709)     (1,921)
           Other assets                                                          (766)       (286)
           Accounts payable                                                     1,177       1,031
           Accrued liabilities                                                  2,564      (1,924)
           Income taxes payable                                                   322      (1,024)
           Other liabilities                                                    1,143       1,140
                                                                             --------------------
Net cash provided by (used in) operating activities                            12,635      (3,500)

Cash flows from investing activities:
     Purchases of property, plant and equipment                                (2,082)     (1,290)
     Purchases of Sentex Systems, Inc.                                             --      (1,500)
     Proceeds from sale of marketable securities                                1,038          --
                                                                             --------------------
Net cash (used in) investing activities                                        (1,044)     (2,790)

Cash flows from financing activities:
     Proceeds from exercise of stock options                                       31          --
                                                                             --------------------
Effect of exchange rate changes on cash and cash equivalents                     (733)        900
                                                                             --------------------
Increase (Decrease) in cash and cash equivalents                               10,889      (5,390)
Cash and cash equivalents at beginning of period                               37,074      37,846
                                                                             --------------------
Cash and cash equivalents at end of period                                   $ 47,963    $ 32,456
                                                                             ====================



See condensed notes to consolidated financial statements.


                                      -6-


                               INFICON Holding AG

              Condensed Notes to Consolidated Financial Statements
                                   (unaudited)

Note 1--Description of Business

      INFICON Holding AG (INFICON or the "Company") is a leading developer,
manufacturer and supplier of innovative vacuum instrumentation, critical sensor
technologies, and process control software for the semiconductor and other
industries. These analysis, measurement and control products are vital to
original equipment manufacturers (OEMs) and end-users in the complex
manufacturing of semiconductors, flat panel displays, magnetic and optical
storage media, and precision optics. The Company also provides essential
instrumentation for gas leak detection and toxic chemical analysis to the air
conditioning/refrigeration, emergency response, and industrial hygiene markets.
The Company's products include process knowledge and control instruments and
software, leak detectors, vacuum measurement and component products and
field-portable gas chromatograph/mass spectrometer instruments (instrumentation
for environmental health and safety). Headquartered in Syracuse, New York,
INFICON has manufacturing facilities in the United States and Europe and
operations in the United States, Liechtenstein, Switzerland, Germany, Finland,
Japan, United Kingdom, France, Korea, Singapore, Taiwan, China, and Hong Kong.
INFICON is subject to risks common to companies in the semiconductor industry
including, but not limited to, the highly cyclical nature of the semiconductor
industry leading to recurring periods of oversupply, development of
technological innovations by INFICON or its competitors, dependence on key
personnel and the protection of proprietary technology.

Note 2--Basis of Presentation

      The accompanying interim financial statements as of June 30, 2004, for the
three and six months ended June 30, 2004 and 2003, have been prepared in
accordance with accounting principles generally accepted in the United States of
America for interim financial information. Accordingly, they do not include all
of the information and footnotes required by accounting principles generally
accepted in the United States of America for complete financial statements.
While the quarterly financial information is unaudited, the financial statements
included in this report reflect all adjustments (consisting of normal recurring
accruals) the Company considers necessary for a fair presentation of the results
of operations for the interim periods covered and the financial condition of the
Company at the date of the interim balance sheet. Operating results for the
three and six months ended June 30, 2004 are not necessarily indicative of the
results that may be expected for the year ended December 31, 2004.

      The balance sheet as of December 31, 2003 has been derived from the
audited financial statements at that date but does not include all of the
information and footnotes required by accounting principles generally accepted
in the United States of America for complete financial statements. The financial
statements should be read in conjunction with the consolidated financial
statements and footnotes thereto included in the Company's annual report on Form
20-F for the year ended December 31, 2003.

Note 3--Reclassification

      Reclassification - Certain reclassifications have been made to the prior
years' financial statements to conform to the 2004 presentation.

Note 4--Critical Accounting Policies

      The preparation of financial statements in conformity with generally
accepted accounting principles requires management to make estimates and
assumptions that affect the reported amounts of assets and liabilities and
disclosure of contingent assets and liabilities at the dates of the financial
statements and the reported amounts of revenues and expenses during the
reporting periods. On an on-going basis, management evaluates its estimates and
judgments, including, but not limited to, those related to revenue recognition,
pension actuarial assumptions and methods, reserves for obsolescence and excess
inventory, bad debt, warranty, goodwill and intangibles, and valuation
allowances for deferred tax assets. Management bases its estimates and judgments
on historical experience and on various other factors believed to be reasonable
under the circumstances that form the basis for making judgments about the
carrying values of assets and liabilities that are not readily apparent from


                                      -7-


other sources. Actual results may differ from these estimates under different
assumptions or conditions. The following summarizes specific accounting
policies:

      Revenue Recognition - Revenue is recognized upon the transfer of title
      that is generally upon shipment. When a customer's acceptance is required,
      revenue is not recognized until the customer's acceptance is received. The
      Company accrues for anticipated returns and warranty costs upon shipment.

      Goodwill and Intangible Assets - The Company reviews goodwill and
      intangible assets for impairment whenever events or changes in
      circumstances indicate the carrying amount of these assets may not be
      recoverable, and also reviews goodwill annually. Under the provisions of
      SFAS 142, goodwill and intangible assets deemed to have indefinite lives
      are no longer subject to amortization. All other identifiable intangibles
      are amortized over their estimated useful life. Intangible assets, such as
      purchased technology, are generally recorded in connection with the
      acquisition of a business. The value assigned to intangible assets is
      determined by or with assistance of an independent valuation firm based on
      estimates and judgment regarding expectations for the success and life
      cycle of products and technology acquired. If actual results differ
      significantly from the estimates, or other indications are present, the
      Company may be required to record an impairment charge to write down the
      asset to its realizable value. In addition, SFAS No. 142 requires that
      goodwill be tested annually using a two-step process. The first step is to
      identify any potential impairment by comparing the carrying value of the
      reporting unit to its fair value. If a potential impairment is identified,
      the second step is to compare the implied fair value of goodwill with its
      carrying amount to measure the impairment loss. A severe decline in fair
      value could result in an impairment charge to goodwill, which could have a
      material adverse effect on the Company's business, financial condition and
      results of operations. The Company performs its impairment analysis under
      SFAS 142 annually during the third quarter. As of June 30, 2004, the
      Company has no goodwill asset remaining.

      Bad Debts - The allowance for doubtful accounts is for estimated losses
      resulting from a customer's inability to make required payments. If the
      financial condition of our customers were to deteriorate, resulting in an
      impairment of their ability to make payments, additional allowances may be
      required.

      Warranties - The accrual for the estimated cost of product warranties is
      provided for at the time revenue is recognized. While we engage in
      extensive product quality programs and processes, including actively
      monitoring and evaluating the quality of our component suppliers, our
      warranty obligation is affected by product failure rates, material usage,
      and service delivery costs incurred in correcting a product failure.
      Should actual product failure rates, material usage or service delivery
      costs differ from our estimates, revisions to the estimated warranty
      liability may be required.

      Inventory - Inventories are stated at the lower of cost or market. Cost is
      determined on the first-in, first-out method. The reserve for estimated
      obsolescence or unmarketable inventory is equal to the difference between
      the cost of inventory and the estimated fair value based upon assumptions
      about future demand and market conditions. If actual future demand or
      market conditions are less favorable than those projected by management,
      additional inventory write-downs may be required.

      Pension Benefits - The pension benefit costs and credits are developed
      from actuarial valuations. Inherent in these valuations are key
      assumptions including discount rates and expected return on plan assets.
      The Company considers current market conditions, including changes in
      interest rates, in selecting these assumptions. Changes in the related
      pension benefit costs or credits may occur in the future in addition to
      changes resulting from fluctuations in our related headcount due to
      changes in the assumptions.

      Deferred Tax Assets - As of June 30, 2004, the Company had net deferred
      tax assets of U.S.$39.4 million reflecting tax credit and loss carry
      forwards, basis differences primarily from intangible assets, and other
      deductions available to reduce taxable income in future years. A majority
      of the net deferred tax assets balance of U.S.$39.4 million resides in the
      United States. In assessing the realization of the Company's deferred tax
      assets, we consider whether it is more likely than not the deferred tax
      assets will be realized. The ultimate realization of our deferred income
      tax assets depends upon our ability to generate future taxable income,
      including the implementation of tax planning strategies, during the
      periods in which our basis differences and other deductions become
      deductible and prior to the expiration of our net operating loss carry
      forwards. On a quarterly basis, the Company evaluates the recoverability


                                      -8-


      of its deferred tax assets based upon historical results and forecasted
      results over future years, considering tax planning strategies, and
      matches this forecast against the basis differences, deductions available
      in future years and the limitations allowed for net operating loss carry
      forwards to ensure there is adequate support for the realization of the
      deferred tax assets. While we have considered future operating results, in
      conjunction with ongoing prudent and feasible tax planning strategies in
      assessing the need for the valuation allowance, in the event we were to
      determine that we would not be able to realize all or part of our net
      deferred tax assets in the future, an adjustment to the deferred tax
      assets would be charged as a reduction to income in the period such
      determination was made. Likewise, should we determine that we would be
      able to realize future deferred tax assets in excess of its net recorded
      amount, an adjustment to the deferred tax assets would increase income in
      the period such determination was made.

      Although realization is not assured, the Company believes it is more
      likely than not the net deferred tax asset balance as of June 30, 2004
      will be realized. The Company supports this conclusion based upon recent
      results, projections of future operating results and tax planning
      strategies that support the realization of the deferred tax assets, and
      other positive and negative evidence. Differences between forecasted and
      actual future operating results could adversely impact our ability to
      realize our deferred income tax assets; however, differences between
      forecasted and actual future operating results are continually monitored
      to ensure the Company has adequate support for the realization of the
      deferred tax assets. The Company's analysis supporting the realization of
      the deferred tax assets places careful consideration on the net operating
      loss carry forward periods.

      In recent years, the Company's U.S. operations have experienced losses
      before income taxes for financial and tax reporting purposes; however, we
      believe recent results, improvements in the order backlog, industry
      projections as well as changes in our operations and tax planning that
      occurred during the fourth quarter of 2003 and first two quarters of 2004,
      in addition to other improvements that will take place in future periods,
      are sufficient to generate the minimum amounts of taxable income to
      utilize our net operating loss carry forwards prior to their expiration.
      The changes in the Company's operations include:

            o     Various cost saving and restructuring initiatives to reduce
                  manufacturing and overhead costs;
            o     Capitalization of the intercompany debt arrangement between
                  INFICON Inc. (US location) and INFICON GmbH (Switzerland);
            o     Review of R&D allocations between related parties to identify
                  and implement tax planning strategies to maximize the
                  Company's tax benefit;
            o     Other changes in an effort to increase the efficiency and
                  effectiveness of our business operations.

      The Company believes it is more likely than not it will be able to
      generate sufficient taxable income in the United States to absorb its net
      operating loss carry forwards, which begin to expire in 2021, although
      there can be no assurances. If the Company's expectations for future
      operating results are not met due to general economic conditions or other
      factors, the Company may need to establish additional valuation allowances
      for all or a portion of its deferred tax assets primarily relating to its
      U.S. operations. This could have a significant effect on our future
      results of operations and financial position.

      Impairment of Long-Lived Assets - SFAS No. 144, "Accounting for the
      Impairment or Disposal of Long-Lived Assets," was early adopted by the
      Company on January 1, 2002, and supersedes SFAS No. 121, "Accounting for
      the Impairment of Long-Lived Assets and for Long-Lived Assets to be
      Disposed of," while retaining many of the requirements of SFAS No. 121. In
      accordance with SFAS No. 144, long-lived assets to be held and used by an
      entity are to be reviewed for impairment whenever events or changes in
      circumstances indicate the carrying amount of an asset may not be
      recoverable. SFAS 144 defines a two-step testing process, the timing of
      the steps and the general valuation methods to be used in the testing
      process. The first step is a recoverability test, which compares the
      carrying amount of a long-lived asset (asset group) to the sum of the
      undiscounted cash flows expected to result from the use and eventual
      disposition of the asset (asset group). If the carrying amount is greater
      than the sum of the undiscounted cash flows then the second step is
      required. The second step is a fair value test in which the carrying value
      of the asset (asset group) is compared to the fair value of the asset
      (asset group). In estimating the fair value, the present value technique
      is used. An impairment loss shall be measured as the amount by which the
      carrying amount of a long-lived asset (asset group) exceeds its fair
      value. During the first quarter of 2004, the Company recorded an

                                      -9-


      impairment on the remaining balance of indentifiable intangibles
      associated with its acquisition of New Vision Systems. The pre-tax charge
      for the impairment charge is included in the discontinued operations, net,
      on the consolidated statements of income, and totaled $341 and $0 for the
      six months ended June 30, 2004 and 2003, respectively. The impairment
      charge of U.S. $0.3 million, for the six months ended June 30, 2004, was
      recorded during the three months ended March 31, 2004 and was allocated to
      intangibles.

      Disposal of Long-Lived Assets/Discontinued Operations - SFAS No. 144,
      "Accounting for the Impairment or Disposal of Long-Lived Assets," was
      early adopted by the Company on January 1, 2002 and supersedes a portion
      of Accounting Principle Board (APB) No. 30, "Reporting the Results of
      Operations - Reporting the Effects of Disposal of a Segment of a
      Business," relating to reporting the effects of disposal of a segment of a
      business, while retaining many of the requirements of this statement.
      Under SFAS No. 144, the definition of what constitutes a discontinued
      operation is broader, discontinued operations are no longer measured on a
      net realizable value basis, and future operating losses are no longer
      recognized before they occur (see Note 7).

Stock Options

The Company has elected to follow Accounting Principles Board Opinion No. 25,
"Accounting for Stock Issued to Employees" (APB 25) and related interpretations
in accounting for its employee stock options. Under APB 25, because the exercise
price of the Company's employee stock options equals the market price of the
underlying stock on the date of grant, no compensation expense is recognized

For purposes of pro forma disclosures, the estimated fair value of the options
is amortized to expense over the options' vesting period. The Company's pro
forma information follows:

      (USD. in thousands, except per share amounts)



                                                    Three months ended       Six months ended
                                                         June 30                 June 30
                                                  --------------------------------------------
                                                    2004        2003        2004         2003
                                                  --------------------------------------------
                                                                           
      Net income (loss), as reported              $ 4,081     $(1,560)    $ 7,600      $(1,517)
      Income from continuing operations             4,058         412       8,293        1,967
      Less:  Stock based compensation
      expense, net of tax                            (312)     (1,583)       (538)      (3,093)
                                                  --------------------------------------------
      Proforma income (loss) from
      continuing operations                         3,746      (1,171)      7,755       (1,126)

      Gain (loss) from discontinued operations         23      (1,972)       (693)      (3,484)
                                                  --------------------------------------------
      Pro forma net income (loss)                 $ 3,769     $(3,143)    $ 7,062      $(4,610)
                                                  ============================================

      Earnings (loss) per share Diluted:
      Continuing operations - as reported         $  1.74     $  0.18     $  3.55      $  0.85
      Discontinued operations - as reported          0.01       (0.85)      (0.30)       (1.50)
                                                  --------------------------------------------
      Total - as reported                         $  1.75     $ (0.67)    $  3.26*     $ (0.66)*

      Continuing operations - pro forma           $  1.61     $ (0.51)    $  3.32      $ (0.49)
      Discontinued operations - pro forma            0.01       (0.85)      (0.30)       (1.50)
                                                  --------------------------------------------
      Total - proforma                            $  1.62     $ (1.36)    $  3.02      $ (1.99)

      Earnings (loss) per share Basic:
      Continuing operations - as reported         $  1.75     $  0.18     $  3.58      $  0.85
      Discontinued operations - as reported          0.01       (0.85)      (0.30)       (1.50)
                                                  --------------------------------------------
      Total - as reported                         $  1.76     $ (0.67)    $  3.28      $ (0.66)*

      Continuing operations - pro forma           $  1.62     $ (0.51)    $  3.35      $ (0.49)
      Discontinued operations - pro forma            0.01       (0.85)      (0.30)       (1.50)
                                                  --------------------------------------------
      Total - proforma                            $  1.63     $ (1.36)    $  3.05      $ (1.99)
                                                  --------------------------------------------


      *  figures do not total due to rounding


                                      -10-


Note 5--Inventories

Inventories consist of the following (USD in thousands):

                                                    June 30,     December 31,
                                                       2004          2003
                                                   --------------------------

      Raw material                                   $14,831        $14,866
      Work in process                                  1,136          1,054
      Finished goods                                   3,881          3,475
                                                   --------------------------

                                                     $19,848        $19,395
                                                   ==========================

Note 6--Investments (USD in thousands)

      In April 2004 the Company became aware it owned 22,793 shares of
Prudential Financial, Inc. (Prudential) stock resulting from Prudential's
conversion from a mutual company to a public stock company in the fourth quarter
of 2001. Prudential had been the Company's insurance carrier for a number of
years and as a result the Company earned these shares in the conversion. In
considering the appropriate accounting for this event, the Company considered a
number of quantitative and qualitative factors and has determined that recording
the non-operating income for value of the stock in the quarter it became known
is appropriate. We recorded current income for the value of the stock at the
time the Company first became aware of the shares. The effect on net income of
this transaction was U.S.$454 and has been recorded as an increase in other
income in the first quarter of 2004. The unrealized change in value, which has
not been material, of the shares subsequent to the demutualization was recorded
retroactively through equity as the stock is classified as available-for-sale.
In the second quarter of 2004, the balance of the stock was sold. The effect on
net income of this transaction was U.S.$178 and has been recorded as an increase
in other income in the second quarter of 2004.

Note 7 - Discontinued Operations - Ultra Clean Processing & Patterning Solutions

      For the three months ended June 30, 2004 and 2003, the Company recorded a
gain (loss) from discontinued operations of U.S.$23 thousand and U.S.$(2.0)
million, respectively, and for the six months ended June 2004 and 2003 the
Company recorded losses from discontinued operations of, U.S.$(0.7) million and
U.S.$(3.5) million, respectively, related to the divestment of its ultra clean
processing product line and disposal of its patterning solutions product line.

      The divestment of the Company's ultra clean processing product line was
structured as a management buyout where selected assets were purchased for
approximately U.S.$614, with the payment terms allowing the Company the
potential to recoup a portion of the divestment costs over the next three years.
The Company received a payment of approximately U.S. $78 during Q2 2004 and
U.S.$123 during 2003. The remaining balance, resulting from the management
buyout, will be paid over the next three years. The Company's decision to divest
the ultra clean processing business unit was based upon its long-term strategy


                                      -11-


of focusing on the Company's core competencies in the front-end of the
semiconductor manufacturing process. The divestment was completed as of December
31, 2003. The ultra clean processing products service the semiconductor market
and were reported under the semiconductor vacuum instrumentation segment. During
the three and six months ended June 30, 2004, the Company realized a net gain on
the disposal of inventory and payment from the sale relative to the ultra clean
processing product line of U.S.$0.3 million and U.S.$0.5 million,
respectively.

      In March 2004, the Company retained the services of an investment bank in
connection with the disposal of its patterning solutions software business. The
Company's decision to pursue a sale of its patterning solutions software
business is based upon its decision to further focus its resources. There is no
assurance a sale will occur. Additionally, the Company recorded an impairment
loss of U.S.$0.3 million, for the six months ended June 30, 2004, on the balance
of its intangible asset. The Company's patterning solutions software business
had assets of U.S.$5.0 million and liabilities of U.S.$0.7 as of June 30, 2004
(excluding intercompany transactions). The patterning solutions software
business services the semiconductor market and were reported under the
semiconductor vacuum instrumentation segment.

      Provided below is a summary of the discontinued operations for the ultra
clean processing and patterning solutions product line, net of tax.



                                                                            Three Months Ended
                                                                                  June 30
                                                                            (USD in Thousands)
                                                               2004                                     2003
                                               ------------------------------------     --------------------------------------
                                                                         Patterning                                Patterning
                                                 Total      Ultra Clean   Solutions       Total      Ultra Clean    Solutions
                                                                                                  
Loss from operations                           $   (267)     $     --     $   (267)     $ (1,972)     $   (790)     $ (1,182)

Gain on disposal                               $    290      $    290     $     --      $     --      $     --      $     --

                                               -----------------------------------      -------------------------------------
Income (loss) from discontinued operations     $     23      $    290     $   (267)     $ (1,972)     $   (790)     $ (1,182)


                                                                             Six Months Ended
                                                                                  June 30
                                                                            (USD in Thousands)
                                                               2004                                     2003
                                               ------------------------------------     --------------------------------------
                                                                         Patterning                                Patterning
                                                 Total      Ultra Clean   Solutions       Total      Ultra Clean    Solutions
                                                                                                  
Loss from operations                           $ (1,179)     $     --     $ (1,179)     $ (3,484)     $ (1,395)     $ (2,089)

Gain on disposal                               $    486      $    486     $     --      $     --      $     --      $     --

                                               -----------------------------------      -------------------------------------
Income (loss) from discontinued operations     $   (693)     $    486     $ (1,179)     $ (3,484)     $ (1,395)     $ (2,089)


Note 8--Warranty

Charges to warranty reserve during the first six months of 2004 and 2003 were as
follows (USD in thousands):

                                     Add:            Deduct:
               Balance at          Warranty          Warranty         Balance at
              December 31         Provisions          Claims            June 30
              -----------         ----------          ------            -------

2004          $     2,514         $     811          $  1,015          $  2,310

2003          $     2,246         $     421          $    206          $  2,461


                                      -12-


Note 9--Derivative Financial Instruments

      On January 1, 2001, the Company adopted Statement of Financial Accounting
Standards Board No. 133 ("SFAS 133"), Accounting for Certain Derivative
Instruments and Certain Hedging Activities. SFAS No. 133 requires that all
derivatives, including foreign currency exchange contracts, be recognized on the
balance sheet at fair value. Derivatives that are not determined to be hedges
must be recorded at fair value through earnings. The cumulative after tax effect
for the unrealized gains (losses) on foreign currency hedges recorded in
accumulated other comprehensive income was U.S.$2 thousand and U.S.$2 thousand
as of June 30, 2004 and December 31, 2003, respectively.

      The Company maintains a foreign currency exchange risk management strategy
that uses derivative instruments, in the form of forward exchange contracts, to
hedge against future movements in foreign exchange rates that affect certain
foreign currency denominated sales and related purchase transactions, caused by
currency exchange rate volatility. These contracts are designated as cash flow
and fair value hedges and generally have durations of less than one year. The
Company attempts to match the forward contracts with the underlying items being
hedged in terms of currency, amount and maturity. The primary currencies in
which the Company has exposure are the Euro, Swiss franc and Japanese yen. This
exposure arises in certain locations from intercompany purchases of inventory in
foreign currency for resale in local currency.

      The Company's accounting policy, for derivative financial instruments, is
based on its designation of such instruments as hedging transactions. An
instrument is designated as a hedge based in part on its effectiveness in risk
reduction and one-to-one matching of derivative instruments to underlying
transactions. The Company records all derivatives on the balance sheet at fair
value. For derivative instruments that are designated and qualify as cash flow
and fair value hedges, the effective portion of the gain or loss on the
derivative instrument is reported as a component of accumulated other
comprehensive income and reclassified into earnings in the same period or
periods during which the hedged transaction affects earnings. The Company did
not have any significant gains or losses from ineffective hedges for the three
and six months ended June 30, 2004 and June 30, 2003.

      In April 2003, the FASB issued Statement of Financial Accounting Standards
No. 149 (SFAS 149), "Amendment of Statement 133 on Derivative Instruments and
Hedging Activities." This statement amends SFAS 133 to provide clarification on
the financial accounting and reporting of derivative instruments and hedging
activities and requires contracts with similar characteristics to be accounted
for on a comparable basis. The adoption of SFAS 149, which was effective for
contracts entered into or modified after June 30, 2003, did not have a material
effect on the Company's financial condition or results of operations.

Note 10--Recent Accounting Pronouncements

      In January 2003 the FASB issued Interpretation No. 46 "Consolidation of
Variable Interest Entities" ("FIN No. 46"). In December 2003 , the FASB approved
a partial deferral of the adoption of the interpretation and issued FIN 46-R on
December 24, 2003. This interpretation clarifies existing accounting principles
related to the preparation of consolidated financial statements when the equity
investors in an entity do not have the characteristics of a controlling
financial interest or when the equity at risk is not sufficient for the entity
to finance its activities without additional subordinated financial support from
others parties. FIN No. 46-R requires a company to evaluate all existing
arrangements to identify situations where a company has a "variable interest"
(commonly evidenced by a guarantee arrangement or other commitment to provide
financial support) in a "variable interest entity" (commonly a thinly
capitalized entity) and further determine when such variable interests require a
company to consolidate the variable interest entities' financial statements with
its own. FIN No. 46-R is effective immediately for all variable interest
entities created after January 31, 2003, and is effective for all variable
interest entities created prior to that date beginning January 1, 2004. The
adoption of FIN No. 46-R did not have a material impact on the Company's
financial position or results of operations.

      In April 2003, the FASB issued Statement of Financial Accounting Standards
No. 149 (SFAS 149), "Amendment of Statement 133 on Derivative Instruments and
Hedging Activities." The summarization of this statement is addressed in Note 8.

      In May 2003, the FASB issued Statement of Financial Accounting Standards
No. 150 (SFAS No. 150), "Accounting for Certain Financial Instruments with
Characteristics of both Liabilities and Equity". SFAS No. 150 establishes


                                      -13-


standards on the classification and measurement of financial instruments with
characteristics of both liabilities and equity. SFAS No. 150 is effective for
financial instruments entered into or modified after May 31, 2003 and for all
financial instruments at the beginning of the first interim period beginning
after June 15, 2003. The adoption of SFAS No. 150 did not have an impact on the
Company's financial position or results of operations

      In December 2003, the FASB issued Statement of Financial Accounting
Standards No. 132 (revised 2003) (SFAS 132), "Employers' Disclosures about
Pensions and Other Postretirement Benefits," that improves financial statement
disclosures for defined benefit plans. The change replaces existing SFAS 132
disclosure requirements for pensions and other postretirement benefits and
revised employers' disclosures about pension plans and other postretirement
benefit plans. It does not change the measurement or recognition of those plans
required by SFAS 87, "Employers' Accounting for Pensions," SFAS 88 and
"Employers' Accounting for Settlements and Curtailments of Defined Benefit
Pension Plans and for Termination Benefits," and SFAS 132 revised retains the
disclosure requirements contained in the original SFAS 132, but requires
additional disclosures about the plan assets, obligations, cash flows, and net
periodic benefit cost of defined benefit pension plans and other defined benefit
postretirement plans. SFAS 132 revised is effective, for the domestic plans of
publicly traded entities, for annual and interim periods with fiscal years
ending after December 15, 2003. Estimated future benefit payments, and all other
new disclosure requirements for foreign plans and nonpublic entities are
effective for years ending after June 15, 2004. We have adopted the revised
disclosure provisions in note 16.

Note 11--Comprehensive Income (Loss)

      Comprehensive income (loss) is defined as the total change in
stockholders' equity during the period other than from transactions with
stockholders. For the Company, comprehensive income (loss) consists of net
income plus the net change in accumulated other comprehensive income (loss), an
element of stockholders' equity. Accumulated other comprehensive income (loss)
consists of the net change in the accumulated foreign currency translation
adjustment account and the net change in unrealized gains and losses in hedging
activity.

      The Company's comprehensive income (loss) for the six months ended June
30, 2004 and 2003 was:

                                                             Six Months Ended
                                                                  June 30
USD in thousands                                             2004         2003
                                                           --------------------

Net income (loss)                                          $ 7,600      $(1,517)
   Other Comprehensive Income (Loss) net of tax:
       Net foreign currency translation adjustments         (1,366)       1,913
       Unrealized (loss) on foreign currency
       Hedges                                                   --          (56)
                                                           --------------------
       Other Comprehensive Income (loss)                    (1,366)       1,857
                                                           --------------------

Comprehensive Income                                       $ 6,234      $   340
                                                           ====================

Note 12-Segment Information

      INFICON Holding AG (INFICON or the "Company") is a leading developer,
manufacturer and supplier of innovative vacuum instrumentation, critical sensor
technologies, and advanced process control software for the semiconductor and
other industries with headquarters in the United States, and administrative
offices and manufacturing in the United States, Germany, and Liechtenstein, in
addition to sales and service locations worldwide. INFICON operates in two
primary business segments: Semiconductor Vacuum Instrumentation and General
Vacuum Instrumentation.

      The semiconductor vacuum instrumentation segment includes one product
line: process knowledge and control instruments and software (formerly in situ
analysis). The products in this segment are developed for use in various
semiconductor and other vacuum coating applications. The general vacuum
instrumentation segment includes three major product lines: leak detection,
vacuum measurement and components, and instrumentation for environmental health


                                      -14-


and safety. These products are used in numerous markets including air
conditioning, refrigeration, automotive, emergency response, industrial hygiene
and semiconductor manufacturing.

      Information on the Company's business segments on a continuing operations
basis, for net sales, gross profit, and earnings before interest and taxes was
as follows (USD in thousands):



                                              Three Months Ended           Six Months Ended
                                                    June 30,                   June 30,
                                               2004         2003          2004         2003
                                           --------------------------------------------------

                                                                         
Net Sales:
Semiconductor vacuum instrumentation         $ 13,169     $  8,110      $ 23,241     $ 18,363
General vacuum instrumentation                 36,641       28,135        73,897       56,771
                                             ------------------------------------------------
Total net sales                              $ 49,810     $ 36,245      $ 97,138     $ 75,134
                                             ================================================

Gross profit:
Semiconductor vacuum instrumentation         $  6,837     $  3,571      $ 12,669     $  8,883
General vacuum instrumentation                 16,780       12,163        33,550       24,233
                                             ------------------------------------------------
Total gross profit                           $ 23,617     $ 15,734      $ 46,219     $ 33,116
                                             ================================================

Earnings (loss) before interest and taxes:
Semiconductor vacuum instrumentation         $  1,184     $ (1,732)     $  1,924     $ (1,688)
General vacuum instrumentation                  4,584        1,890         9,353        3,858
                                             ------------------------------------------------
Total earnings before interest and taxes     $  5,768     $    158      $ 11,277     $  2,170
                                             ================================================

Depreciation and amortization:
Semiconductor vacuum instrumentation         $    365     $    649      $    699     $  1,205
General vacuum instrumentation                    736          409         1,611          882
                                             ------------------------------------------------
Total depreciation and amortization          $  1,101     $  1,058      $  2,310     $  2,087
                                             ================================================

Capital expenditures:
Semiconductor vacuum instrumentation         $    526     $    402      $    676     $  1,027
General vacuum instrumentation                    465        1,074         1,406        1,763
                                             ------------------------------------------------
Total capital expenditures                   $    991     $  1,476      $  2,082     $  2,790
                                             ================================================

Sales by geographic location:(1)
United States                                $ 15,996     $ 13,390      $ 32,315     $ 25,820
Europe                                         22,496       16,267        44,983       33,381
Asia                                           11,318        6,588        19,840       15,933
                                             ------------------------------------------------
Total sales                                  $ 49,810     $ 36,245      $ 97,138     $ 75,134
                                             ================================================


                                                      June 30,    December 31,
                                                        2004          2003
                                                      ----------------------
Total assets:
Semiconductor vacuum instrumentation                  $ 58,038      $ 55,467
General vacuum instrumentation                         104,003        95,207
                                                      ----------------------

Total assets                                          $162,041      $150,674
                                                      ======================


                                      -15-


                                                      June 30,    December 31,
                                                        2004          2003
                                                      ----------------------
Long-lived assets (2):
Semiconductor vacuum instrumentation                  $  8,963      $  9,996
General vacuum instrumentation                          16,367        16,514
                                                      ----------------------
Total long-lived assets                               $ 25,330      $ 26,510
                                                      ======================

(1)   The geographic location of a sale is determined by the subsidiary that
      recorded the sale, rather than customer location
(2)   Long-lived assets excludes deferred taxes

Note 13--Earnings (Loss) Per Share

      The Company computes basic and diluted earnings per share in accordance
with Statement of Financial Accounting Standards No. 128 ("SFAS 128") "Earnings
per Share". SFAS 128 requires both basic earnings per share, which is based on
the weighted average number of common shares outstanding, and diluted earnings
per share, which is based on the weighted average number of common shares
outstanding and all dilutive common equivalent shares outstanding. The dilutive
effect of options is determined under the treasury stock method using the
average market price for the period. Common equivalent shares are included in
the per share calculations where the effect of their inclusion would be
dilutive.

The following table sets forth the computation of basic and diluted earnings per
share ( USD in thousands, except per share and per share amounts):



                                                              Three Months Ended            Six Months Ended
                                                                    June 30                      June 30
                                                         -------------------------------------------------------
                                                             2004          2003           2004           2003
                                                         -------------------------------------------------------

                                                                                          
Numerator:
Numerator for basic and diluted earnings per share:
    Income from continuing operations                    $    4,058    $      412     $    8,293      $    1,967
    Gain (loss) from discontinued operations                     23        (1,972)          (693)         (3,484)
                                                         -------------------------------------------------------
    Net income (loss)                                    $    4,081    $   (1,560)    $    7,600      $   (1,517)

Denominator:

Denominator for basic and diluted earnings per share:
Weighted average shares outstanding                       2,315,574     2,315,000      2,315,345       2,315,000

Basic shares
Diluted shares                                            2,333,573     2,315,000      2,334,512       2,315,000

Earnings (loss) per share:
     Diluted
         Continuing Operations                           $     1.74    $     0.18     $     3.55      $     0.85
         Discontinued Operations                               0.01         (0.85)         (0.30)          (1.50)
                                                         -------------------------------------------------------
         Total                                           $     1.75    $    (0.67)    $     3.26*     $    (0.66)*
                                                         =======================================================
     Basic
         Continuing Operations                           $     1.75    $     0.18     $     3.58      $     0.85
         Discontinued Operations                               0.01         (0.85)         (0.30)          (1.50)
                                                         -------------------------------------------------------
         Total                                           $     1.76    $    (0.67)    $     3.28      $    (0.66)*
                                                         =======================================================


* Figures do not total due to rounding


                                      -16-


      In December 2002, the FASB issued Statement of Financial Accounting
Standards No. 148 (SFAS 148), "Accounting for Stock-Based Compensation -
Transition and Disclosure - an Amendment of FASB Statement No. 123 (SFAS 123),"
which is effective for financial statements for fiscal years ending after
December 15, 2002, with early adoption permitted. SFAS 148 will enable companies
that choose to adopt the preferable fair value based method to report the full
effect of employee stock options in their financial statements immediately upon
adoption, and to make available to investors better and more frequent disclosure
about the cost of employee stock options. We will continue to apply the
disclosure only provisions of both SFAS 123 and SFAS 148.

Note 14--Acquisition of New Vision Systems (USD in  thousands)

      In January 2003, the Company acquired 100% of the stock of a
privately-held company, New Vision Systems, a leader in advanced process control
(APC) for patterning processes in semiconductor manufacturing pursuant to an
Agreement and Plan of Merger which closed on January 3. The acquisition of New
Vision Systems was intended to expand the Company's reach in the semiconductor
fab industry by extending its range of process capability in the advanced
process control (APC) market to include photolithography. Photolithography,
fundamental to creating the pattern of integrated circuits (IC) on a
semiconductor wafer, is the most challenging and strategically important process
in manufacturing semiconductor devices. New Vision Systems develops and deploys
a full suite of process control software compatible with tools from all major
photolithography and metrology equipment suppliers. These products improve
equipment productivity and chip yield in semiconductor fabrication.

      In March 2004, the Company retained the services of an investment bank to
assist the Company with the disposal of its patterning solutions software
business. The Company's decision to pursue a sale of its patterning solutions
software business is based upon its decision to further focus its resources
coupled with its lower than expected financial performance. There is no
assurance a sale will occur. Based upon the Company's decision to pursue a sale
of its patterning solutions software business, the result of operations for this
business are reported as discontinued operations for the three and six months
ended June 30, 2004 and 2003, respectively. Additionally, the Company recorded
an impairment loss of U.S.$0.3 million, for the three and six months ended June
30, 2004, on the balance of its intangible asset. The impairment charge of U.S.
$0.3 million, for the six months ended June 30, 2004, was recorded during the
three months ended March 31, 2004 and was allocated to intangibles.

      The results of operations for INFICON LT (formerly New Vision Systems)
have been included in the Company's consolidated financial statements, and
reported under discontinued operations, for the three and six months ended June
30, 2004 and 2003, respectively.

Note 15--Acquisition of Sentex Systems Inc. (USD in thousands)

      In May 2003, the Company acquired 100% of the assets and assumed certain
liabilities of a privately-held company, Sentex Systems Inc. Sentex Systems,
founded in 1980, supplies sophisticated monitoring and analysis instruments
using gas chromatography (GC) technology to detect volatile organic compounds
(VOCs) for industrial and environmental monitoring, testing, and security.
Sentex product lines include continuous, on-line water monitors for applications
such as factory discharge water or water security, air monitors for spot
analysis or continuous on-site monitoring and explosives detectors for building
and site security and protection. Sentex products complement the HAPSITE fully
portable chemical identification systems (gas chromatograph/mass spectrometer or
GC/MS technology) used for fast on-scene detection and analysis of chemical
agents and toxic materials in air, soil and water. The financial results for
Sentex products are reported under the general vacuum instrumentation segment.

      The transaction was accounted for under the purchase method of accounting
for business combinations, and the results of operations have been included in
the Company's consolidated financial statements as of the second quarter ending
June 30, 2003.

Pro forma results of operations:

      The following unaudited pro forma information summarizes the Company's
consolidated results of operations as if Sentex Systems acquisition had taken
place at the beginning of 2003.


                                      -17-




                                       Three months ended        Six months ended
                                             June 30                  June 30
                                      ----------------------------------------------
                                        2004        2003         2004        2003
                                      ----------------------------------------------

                                                               
      Net Sales                       $ 49,810    $ 36,524     $ 97,138    $ 75,692

      Net income (loss)               $  4,081    $ (1,532)    $  7,600    $ (1,460)
                                      ==============================================

      Diluted net income per share    $   1.75    $  (0.66)    $   3.26    $  (0.63)

      Basic net income per share      $   1.76    $  (0.66)    $   3.28    $  (0.63)


Note 16--Employee Benefit Plans

The Company's net pension cost included the following components (USD in
thousands):



                                        Three Months Ended            Six Months Ended
                                             June 30                       June 30
                                       2004           2003           2004           2003
                                     --------       --------       --------       --------

                                                                      
      Service cost                   $    641       $    592       $    960       $  1,004
      Interest cost                       704            621          1,057            978
      Expected return on assets          (595)          (532)        (1,023)          (957)
      Net amortization of:
        Prior service cost                 20            140             35            151
        Net actuarial loss                291            242            519            575
                                     --------       --------       --------       --------
      Net periodic pension cost      $  1,061       $  1,063       $  1,548       $  1,751



                                      -18-


Operating and Financial Review and Prospects

Cautionary Note Regarding Forward - Looking Statements

      Certain statements in this quarterly report on Form 6-K constitute
forward-looking statements within the meaning of the Private Securities
Litigation Reform Act of 1995. Forward-looking statements include all statements
that do not relate solely to historical or current facts, and can be identified
by the use of words such as "may", "believe", "will", "expect", "project",
"assume", "estimate", "anticipate", "plan", "continue", "resumes",
"opportunity", "potential", "forecast", "guidance" or "outlook". These
forward-looking statements address, among other things, our strategic
objectives, trends in vacuum technology and in the industries that employ vacuum
instrumentation, such as the semiconductor and related industries, and the
anticipated effects of these trends on our business. These forward-looking
statements are based on the current plans and expectations of our management and
are subject to a number of uncertainties and risks that could significantly
affect our current plans and expectations, as well as future results of
operations and financial condition. Some of these risks and uncertainties are
discussed under "Recent Developments" below and under "Key Information---Risk
Factors" in our most recent annual report on Form 20-F filed by us with the
Securities and Exchange Commission.

      As a consequence, our current and anticipated plans and our future
prospects, results of operations and financial condition may differ from those
expressed in any forward-looking statements made by or on behalf of our company.
We undertake no obligation to publicly update or revise any forward-looking
statements, whether as a result of new information, future events or otherwise.

Overview

      INFICON Holding AG is a corporation (Aktiengesellschaft) organized under
the laws of Switzerland. In this quarterly report, "INFICON", the "INFICON
Group", "the Company", "we", "us" and "our" refer to INFICON Holding AG and its
consolidated subsidiaries. All references to "Unaxis" refer to our significant
shareholder, Unaxis Holding AG, a corporation (Aktiengesellschaft) organized
under the laws of Switzerland.

      INFICON Holding AG is a leading developer, manufacturer and supplier of
vacuum instrumentation, critical sensor technologies, and process control
software for the semiconductor and other industries. The Company's products
include process knowledge and control instruments and software (formerly in situ
analysis), leak detectors, vacuum measurement and component products and
field-portable gas chromatograph/mass spectrometer instruments (instrumentation
for environmental health and safety). INFICON is subject to risks common to
companies in the semiconductor industry including, but not limited to, the
highly cyclical nature of the semiconductor industry leading to recurring
periods of oversupply, development of technological innovations by INFICON or
its competitors, dependence on key personnel, and the protection of proprietary
technology.

Semiconductor Industry

      The semiconductor industry has historically experienced sudden changes in
supply and demand for semiconductors and is also subject to rapid technological
changes in semiconductor manufacturing processes. These factors are generally
the cause of strong volatility of demand for semiconductor capital equipment. We
believe that a global economic slowdown and a severe downturn in the
semiconductor and related industries could continue to have a negative effect on
our financial performance for the remainder of this year.

      Deferred Tax Assets

      Deferred Tax Assets - As of June 30, 2004, the Company had net deferred
tax assets of U.S.$39.4 million reflecting tax credit and loss carry forwards,
basis differences primarily from intangible assets, and other deductions
available to reduce taxable income in future years. A majority of the net
deferred tax assets balance of U.S.$39.4 million resides in the United States.
In assessing the realization of the Company's deferred tax assets, we consider
whether it is more likely than not the deferred tax assets will be realized. The
ultimate realization of our deferred income tax assets depends upon our ability
to generate future taxable income, including the implementation of tax planning
strategies, during the periods in which our basis differences and other
deductions become deductible and prior to the expiration of our net operating
loss carry forwards. On a quarterly basis, the Company evaluates the
recoverability of its deferred tax assets based upon historical results and
forecasted results over future years, considering tax planning strategies, and
matches this forecast against the basis differences, deductions available in


                                      -19-


future years and the limitations allowed for net operating loss carry forwards
to ensure there is adequate support for the realization of the deferred tax
assets. While we have considered future operating results, in conjunction with
ongoing prudent and feasible tax planning strategies in assessing the need for
the valuation allowance, in the event we were to determine that we would not be
able to realize all or part of our net deferred tax assets in the future, an
adjustment to the deferred tax assets would be charged as a reduction to income
in the period such determination was made. Likewise, should we determine that we
would be able to realize future deferred tax assets in excess of its net
recorded amount, an adjustment to the deferred tax assets would increase income
in the period such determination was made.

Although realization is not assured, the Company believes it is more likely than
not the net deferred tax asset balance as of June 30, 2004 will be realized. The
Company supports this conclusion based upon recent results, projections of
future operating results and tax planning strategies that support the
realization of the deferred tax assets, and other positive and negative
evidence. Differences between forecasted and actual future operating results
could adversely impact our ability to realize our deferred income tax assets;
however, differences between forecasted and actual future operating results are
continually monitored to ensure the Company has adequate support for the
realization of the deferred tax assets. The Company's analysis supporting the
realization of the deferred tax assets places careful consideration on the net
operating loss carry forward periods.

In recent years, the Company's U.S. operations have experienced losses before
income taxes for financial and tax reporting purposes; however, we believe
recent results, improvements in the order backlog, industry projections as well
as changes in our operations and tax planning that occurred during the fourth
quarter of 2003 and first two quarters of 2004, in addition to other
improvements that will take place in future periods, are sufficient to generate
the minimum amounts of taxable income to utilize our net operating loss carry
forwards prior to their expiration. The changes in the Company's operations
include:

      o     Various cost saving and restructuring initiatives to reduce
            manufacturing and overhead costs;
      o     Capitalization of the intercompany debt arrangement between INFICON
            Inc. (US location) and INFICON GmbH (Switzerland);
      o     Review of R&D allocations between related parties to identify and
            implement tax planning strategies to maximize the Company's tax
            benefit;
      o     Other changes in an effort to increase the efficiency and
            effectiveness of our business operations.

The Company believes it is more likely than not it will be able to generate
sufficient taxable income in the United States to absorb its net operating loss
carry forwards, which begin to expire in 2021, although there can be no
assurances. If the Company's expectations for future operating results are not
met due to general economic conditions or other factors, the Company may need to
establish additional valuation allowances for all or a portion of its deferred
tax assets primarily relating to its U.S. operations. This could have a
significant affect on our future results of operations and financial position.


                                      -20-


Results of Operations for the Three Months Ended June 30, 2004 and 2003

      Net Sales

      Net sales increased 37.4% to U.S.$49.8 million for the three months ended
June 30, 2004 from U.S.$36.2 million for the three months ended June 30, 2003.
Excluding the impact of changes in currency exchange rates, sales grew by 32.9%.
The increase, excluding the impact of changes in currency exchange rates, is
primarily due to increased sales of the Company's private label products,
process knowledge and control sales to semiconductor device manufacturers and
data storage and flat panel display equipment manufacturers, and increased
Environmental Health & Safety product sales.

      Semiconductor Vacuum Instrumentation Segment. Net sales increased by 62.4%
to U.S.$13.2 million for the three months ended June 30, 2004 from U.S.$8.1
million for the three months ended June 30, 2003. This increase resulted from
improved demand and the timing of revenue recognition for process knowledge and
control instruments and software from semiconductor manufacturers in the United
States and Asia, primarily the result of a large sale to Samsung Electronics Co.
Ltd. in addition to favorable changes in foreign exchange rates relative to the
U.S. dollar of U.S.$0.4 million.

      General Vacuum Instrumentation Segment. Net sales increased by 30.2% to
U.S.$36.6 million for the three months ended June 30, 2004 from U.S.$28.1
million for the three months ended June 30, 2003. This increase is the result of
favorable changes in foreign exchange rates relative to the U.S. dollar of
U.S.$1.2 million and improved demand for sales through private-label
distribution customers of major vacuum pump manufacturers who resell our
products coupled with higher sales from the Environmental Health & Safety and
leak detection product lines.

      Gross Profit

      Gross profit increased by 50.1% to U.S.$23.6 million or 47.4% of net sales
for the three months ended June 30, 2004 from U.S.$15.7 million or 43.4% of net
sales for the three months ended June 30, 2003. The increase in gross profit
percentage is primarily due to favorable foreign exchange rates coupled with the
favorable absorption of fixed manufacturing costs for the vacuum control,
leak detection, process knowledge and control, and Environmental Health & Safety
product lines.

      Research and Development

      Research and development costs increased by 12.4% to U.S.$4.9 million, or
9.8% of net sales, for the three months ended June 30, 2004 from U.S.$4.4
million, or 12.0% of net sales, for the three months ended June 30, 2003. This
increase was driven primarily by changes in foreign exchange rates relative to
the U.S. dollar of U.S.$0.2 million and the addition of research and development
expenses related to vacuum control, process knowledge and control, and leak
detection products, as well as the acquisition of Sentex Systems, Inc. (water
security products) in May 2003.

      Selling, General and Administrative

      Selling, general and administrative expenses increased by 12.4% to
U.S.$13.1 million, or 26.3% of net sales, for the three months ended June 30,
2004 from U.S.$11.6 million, or 32.1% of net sales, for the three months ended
June 30, 2003. This increase is the result of additional costs following the
acquisition of Sentex Systems, Inc. in May 2003, changes in foreign exchange
rates relative to the U.S. dollar of U.S.$0.4 million, coupled with an increase
in salaries and accruals for commissions and bonuses associated with higher
sales and profits related to the vacuum control, leak detection, process
knowledge and control, and Environmental Health & Safety product lines for the
three months ended June 30, 2004.

      Operating Income (Loss) from Continuing Operations

      For the reasons stated above, the operating income from continuing
operations was U.S.$5.6 million, or 11.3% of net sales, for the three months
ended June 30, 2004 from a loss of U.S.$(0.3) million, or (0.7)% of net sales,
for the three months ended June 30, 2003.


                                      -21-


      Other (Income)

      Other income was U.S.$(0.1) million, or 0.3% of net sales, for the three
months ended June 30, 2004 as compared to other income of U.S.$(0.4) million, or
1.2% of net sales, for the three months ended June 30, 2003. The decrease in
other income is primarily the result of higher foreign currency gains recognized
during the three months ended June 30, 2003. The decrease was partially offset
by the gain on the sale of Prudential stock of U.S.$(0.3) million.

      Provision (benefit) for Income Taxes

      The income tax provision was U.S.$1.7 million, or 29.9% of income from
continuing operations before income taxes for the three months ended June 30,
2004 versus an income tax benefit of U.S.$(0.2) million, or 79.0% of income
before taxes, for the three months ended June 30, 2003. The increase in income
tax provision resulted from higher taxable income of U.S.$5.8 million versus
taxable income of U.S.$0.2 million for the three months ended June 30, 2004 and
2003, respectively. The effective tax rate has changed due to a change in the
earnings mix among tax jurisdictions.

      Discontinued Operations

      For the three months ended June 30, 2004 and 2003, the Company recorded
net income from discontinued operations of U.S.$23 thousand and a net loss of
U.S.$(2.0) million, respectively, related to the divestment of its ultra clean
processing product line that was structured as a management buyout and its plan
to sell its patterning solutions product line. The decrease in loss from
discontinued operations is the result of the loss of the ultra clean processing
product line, of U.S.$(0.8) million, which was sold and divested by December 31,
2003, and a decrease in the loss reported by the patterning solutions product
line. During the three months ended June 30, 2004, the Company realized a net
gain on the disposal of inventory relative to the ultra clean processing product
line of U.S.$0.3 million.

      Net Income (loss)

      For the reasons stated above, net income was U.S.$4.1 million, or 8.2% of
net sales, for the three months ended June 30, 2004 from a net loss of
U.S.$(1.6) million, or (4.3)% of net sales, for the three months ended June 30,
2003.


                                      -22-


Results of Operations for the Six Months Ended June 30, 2004 and 2003

      Net Sales

      Net sales increased 29.3% to U.S.$97.1 million for the six months ended
June 30, 2004 from U.S.$75.1 million for the six months ended June 30, 2003.
Excluding the impact of changes in currency exchange rates, sales grew by 23.5%.
The increase, excluding the impact of changes in currency exchange rates, is
primarily due to increased sales of the Company's private label products,
process knowledge and control sales to semiconductor device manufacturers and
data storage and flat panel display equipment manufacturers, and increased
Environmental Health & Safety product sales.

      Semiconductor Vacuum Instrumentation Segment. Net sales increased by 26.6%
to U.S.$23.2 million for the six months ended June 30, 2004 from U.S.$18.4
million for the six months ended June 30, 2003. This increase resulted from
favorable changes in foreign exchange rates relative to the U.S. dollar of
U.S.$0.8 million improved demand and the timing of revenue recognition for
process knowledge and control instruments and software from semiconductor
manufacturers in the United States and Asia, primarily the result of a large
sale to Samsung Electronics Co. Ltd.

      General Vacuum Instrumentation Segment. Net sales increased by 30.2% to
U.S.$73.9 million for the six months ended June 30, 2004 from U.S.$56.8 million
for the six months ended June 30, 2003. This is mainly the result of favorable
changes in foreign exchange rates relative to the U.S. dollar of U.S.$3.5
million and improved demand for sales through private-label distribution
customers of major vacuum pump manufacturers who resell our products as well as
higher sales from the Environmental Health & Safety and leak detection product
lines.

      Gross Profit

      Gross profit increased by 39.6% to U.S.$46.2 million or 47.6% of net sales
for the six months ended June 30, 2004 from U.S.$33.1 million or 44.1% of net
sales for the six months ended June 30, 2003. The increase in gross profit
percentage is primarily due to favorable foreign exchange rates coupled with the
favorable absorption of fixed manufacturing costs for the vacuum control,
leak detection, process knowledge and control, and Environmental Health & Safety
product lines.

      Research and Development

      Research and development costs increased by 14.5% to U.S.$10.0 million, or
10.3% of net sales, for the six months ended June 30, 2004 from U.S.$8.8
million, or 11.6% of net sales, for the six months ended June 30, 2003. This
increase was driven primarily by changes in foreign exchange rates relative to
the U.S. dollar of U.S.$0.5 million and the addition of research and development
expenses related to vacuum control, process knowledge and control, and leak
detection products, as well as the acquisition of Sentex Systems, Inc. in May
2003.

      Selling, General and Administrative

      Selling, general and administrative expenses increased by 14.5% to
U.S.$26.0 million, or 26.8% of net sales, for the six months ended June 30, 2004
from U.S.$22.8 million, or 30.3% of net sales, for the six months ended June 30,
2003. This increase is the result of additional costs following the acquisition
of Sentex Systems, Inc. in May 2003, changes in foreign exchange rates relative
to the U.S. dollar of U.S.$1.0 million, coupled with an increase in salaries and
accruals for commissions and bonuses associated with higher sales and profits
related to the vacuum control, leak detection, process knowledge and control,
and Environmental Health & Safety product lines for the six months ended June
30, 2004.

      Operating Income from Continuing Operations

      For the reasons stated above, the operating income from continuing
operations was U.S.$10.2 million, or 10.5% of net sales, for the six months
ended June 30, 2004 from U.S.$1.6 million, or 2.1% of net sales, for the six
months ended June 30, 2003.


                                      -23-


      Other (Income)

      Other income was U.S.($1.1) million, or 1.2% of net sales, for the six
months ended June 30, 2004 as compared to other income of U.S.$(0.6) million, or
0.7% of net sales, for the six months ended June 30, 2003. The increase in other
income is primarily the result of a gain on shares of stock received from
Prudential Financial, Inc.'s conversion from a mutual company to a public stock
company in the fourth quarter 2001 (see note 6) of U.S.$(0.7) million that was
partially offset by lower foreign currency gains recognized during the six
months ended June 30, 2004.

      Provision for Income Taxes

      The income tax provision was U.S.$3.0 million, or 26.5% of income from
continuing operations before income taxes for the six months ended June 30, 2004
versus an income tax provision of U.S.$0.4 million, or 15.7% of income before
taxes, for the six months ended June 30, 2003. The increase in income tax
provision resulted from higher taxable income of U.S.$11.3 million versus
taxable income of U.S.$2.3 million for the six months ended June 30, 2004 and
2003, respectively. The effective tax rate has changed due to a change in the
earnings mix among tax jurisdictions.

      Discontinued Operations

      For the six months ended June 30, 2004 and 2003, the Company recorded a
net loss from discontinued operations of U.S.$(0.7) million and U.S.$(3.5)
million, respectively, related to the divestment of its ultra clean processing
product line that was structured as a management buyout and its plan to sell its
patterning solutions product line. The decrease in loss from discontinued
operations resulted from the loss of the ultra clean processing product line, of
U.S.$1.4 million, which was sold and divested by December 31, 2003 and a lower
loss from the patterning solutions product line which was U.S.$(2.1) million for
the six months ended June 30, 2003. During the six months ended June 30, 2004,
the Company realized a net gain on the disposal of inventory relative to the
ultra clean processing product line of U.S.$0.3 million.

      Net Income (loss)

      For the reasons stated above, net income was U.S.$7.6 million, or 7.8% of
net sales, for the six months ended June 30, 2004 from a net loss of U.S.$(1.5)
million, or (2.0)% of net sales, for the six months ended June 30, 2003.


                                      -24-


Liquidity and Capital Resources

      Historically, we have been able to finance our operations and capital
requirements through cash provided by operations and accumulated cash balances.
Cash provided by (used in) operating activities was U.S.$12.6 million and
U.S.$(3.5) million for the six months ended June 30, 2004 and 2003,
respectively. In 2004, cash provided by operating activities of U.S.$12.6
million consisted of net income of U.S.$7.6 million, depreciation and
amortization and impairment costs of U.S.$2.6 million, a net decrease in
deferred taxes of U.S.$1.8 million, and a net decrease in working capital of
U.S.$0.6 million. In 2003, cash used in by operating activities of U.S.$(3.5)
million consisted of a net loss of U.S.$(1.5) million, depreciation and
amortization of U.S.$2.1 million, a net increase in deferred taxes of U.S.$0.8
million, and a net increase in working capital of U.S.$3.3 million.

      Working capital was U.S.$74.0 million as of June 30, 2004, compared to
U.S.$64.3 million as of December 31, 2003. The increase was due to increases in
cash of U.S.$10.9 million, accounts receivable of U.S.$1.9 million, inventories
of U.S.$0.5 million, and other current assets of U.S.$1.1 million. This was
offset by decreases in current deferred tax assets of U.S.$1.0 million,
increases in accounts payable of U.S.$1.1 million, accrued liabilities of
U.S.$2.3 million and an increase in income taxes payable of U.S.$0.3 million.

      Cash used in investing activities was U.S.$1.0 million and U.S.$2.8
million for the six months ended June 30, 2004 and 2003, respectively, primarily
used for the purchase of property and equipment used in the Company's operations
and the purchase of Sentex Systems, Inc. in May 2003 for U.S$1.5 million. The
cash used in investing activities for the six months ended June 30, 2004 was
partially offset by the proceeds from the sale of marketable securities of
U.S.$1.0 million.

      Credit facilities

      The Company entered into a U.S.$30.0 million working capital financing
arrangement with Credit Suisse on November 23, 2000. The financing arrangement
can be either in the form of a current account overdraft facility, fixed
advances with a maximum maturity of twelve months, bid/advance
payment/performance bonds, issuance of letters of credit, or as margin coverage
for foreign exchange forward transactions. The working capital financing was
automatically extended for one year on November 23, 2003. The Company has U.S.$0
outstanding under the financing arrangement as of June 30, 2004.

      Additionally, the Company entered into two revolving credit facilities
with HypoVereinsbank on February 28, 2001. The credit facilities include a HKD
5.5 million (approximately U.S.$0.7 million) working capital financing
arrangement and a HKD 9.25 million (approximately U.S.$1.2 million) margin
coverage arrangement for foreign exchange forward transactions. The working
capital financing arrangement can be either in the form of a current account
overdraft facility, fixed advances with a maximum maturity of nine months, short
term trust receipt financing, issuance of letters of credit, or issuance of bank
guarantees. The working capital financing arrangement expires on March 31, 2005
and has an option for extension. The Company has U.S.$0 million outstanding
under the financing arrangement as of June 30, 2004.

      We made full recourse loans available to our executive officers eligible
to participate in the leveraged share plan for the purpose of purchasing up to
80% of the shares allocated to them under the plan. Loans made to executive
officers have a term of 7 years and are on a recourse basis. The loans are
collateralized by all of the shares purchased under the leveraged share plan,
and we have either a first, or, if a portion of the shares are financed or
refinanced by another lender, a second lien on the shares. The loans have an
interest rate equal to 120% of the mid-term applicable federal rate (as defined
in the Internal Revenue Code) determined on the date the loans are made. The
balances of the loans payable to us are offset against the value of the shares
on our balance sheet. As of June 30, 2004, there is an outstanding balance on
the loans of U.S.$0.4 million

      We currently believe the cash generated from operations, cash and cash
equivalents, and borrowings available under our financing arrangements and
credit facilities will continue to be sufficient to satisfy our working capital
and capital expenditure requirements.

Risks Relating to Our Business and Financial Results

      Provided below is a summarization of the risks and uncertainties that are
important for you to consider in evaluating historical and future results of the
Company. A detailed explanation of risk factors is also provided in our annual


                                      -25-


report on form 20-F for the year ended December 31, 2003. Additional risks and
uncertainties not presently known to us, which we currently deem immaterial or
which are similar to those faced by other companies in our industry or business,
may also impair our business operations. If any of these risks or uncertainties
actually occur, our business, financial condition and operating results will
likely be affected.

      >>    Downturns in the semiconductor chip manufacturing industry have
            historically, and may have in the future, a material adverse effect
            on our sales and profitability. We cannot assure you that:
            >     the semiconductor chip manufacturing industry will improve;
            >     demand for capital equipment by the semiconductor chip
                  manufacturing industry will continue to increase;
      >>    The loss of sales to our major customers would likely have a
            material adverse effect on the Company;
      >>    Some of our customers compete, or may in the future compete, with
            Unaxis, and to the extent that we are perceived to be controlled by,
            or under common control with Unaxis, we may lose their business;
      >>    Our future growth and competitiveness depends upon our ability to
            develop new and enhanced products for industries we target and to
            adapt rapidly to changing technologies. We cannot assure you that we
            will be successful in our product development efforts or that our
            new products will gain general market acceptance;
      >>    Changes or developments in the semiconductor industry could cause
            shifts in our infrastructure and increase the competition for our
            products;
      >>    The markets for our products are highly competitive. This
            competition may cause us to reduce prices and may result in
            decreases in market share of our products;
      >>    Our failure to protect our proprietary technology relating to vacuum
            instrumentation may significantly impair our competitive position,
            which could result in a loss of revenues and profits; >> Our
            inability to convince OEMs to use our products in their
            manufacturing systems could weaken our competitive position;
      >>    There is no guarantee the Company will receive the full sales price
            for the management buyout of its ultra clean processing business.
            Terms of the agreement allow the Company to recoup a portion of its
            divestment costs over the next three years;
      >>    We must compete intensively to attract and retain key technical
            personnel to help maintain our current level of success and to
            support our future growth;
      >>    Our ability to expand our manufacturing capacity may be limited by
            our suppliers' ability to meet our requirements;
      >>    We have significant international sales to customers outside the
            United States. A reduction in demand for our products resulting from
            economic downturns in one or more of the markets we serve may have a
            material adverse effect on our sales and profitability;
      >>    Unfavorable exchange rate fluctuations may harm our results of
            operations;
      >>    We must make expenditures to comply with environmental laws and
            regulations relating to the production of our vacuum instrumentation
            products;
      >>    The effect of terrorist attacks or threats on the general economy
            could decrease our revenues;
      >>    Future acquisitions could adversely affect our business;
      >>    Benefits from the net deferred tax asset may not be realized (see
            Note 4, Critical Accounting Policies and Operating and Financial
            Review and Prospects section on Deferred Tax Assets for additional
            discussion);
      >>    Financial performance for patterning solutions business does not
            show improved financial performance and the Company is unable to
            locate a buyer for this business;
      >>    Risk of impairment of intangible asset.

      During the third quarter the Company will continue to review its cost
structure, continue with pursuing a buyer of its patterning solution product
line.


                                      -26-


Quantitative and Qualitative Disclosure of Market Risk

      For the six months ended June 30, 2004, we did not experience any material
change in the market risk exposures affecting the quantitative and qualitative
disclosures as presented in our annual report on Form 20-F for the fiscal year
ended December 31, 2003.

      Interest Rate Exposure

      Changes in interest rates could impact the Company's anticipated interest
income earned on its cash balances. Although interest income could be impacted,
the Company does not feel changes in interest rates, from their current levels,
would have a material effect on the Company's financial results.

      Foreign Currency Exchange Rate Risk

      We transact business in various foreign currencies. Our primary foreign
cash flows are generated in the countries of Asia and Europe. The principal
currencies creating foreign exchange rate risk for the Company are the Euro,
Swiss franc, and Japanese yen. The Company maintains a foreign currency exchange
risk management strategy that uses derivative instruments, in the form of
forward exchange contracts, to hedge against future movements in foreign
exchange rates that affect certain foreign currency denominated sales and
related purchase transactions, caused by currency exchange rate volatility.
These contracts are designated as cash flow hedges and generally have durations
of less than one year. The Company attempts to match the forward contracts with
the underlying items being hedged in terms of currency, amount and maturity.
This exposure arises in certain locations from the intercompany purchase of
inventory in foreign currency for resale in local currency.

Enclosures

      Statements furnished under Section 906 of the Sarbanes-Oxley Act of 2002,
18 U.S.C. Section 1350, attached as Exhibit 32.1


                                      -27-


SIGNATURE

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


                                              INFICON Holding AG


Date: August 6, 2004                          By:  /s/ Peter Maier
                                                   -----------------------------
                                              Name: Peter G. Maier
                                              Title: Vice President and
                                                     Chief Financial Officer


                                      -28-