KLA TENCOR CORP
10-K/A, 1998-09-29
OPTICAL INSTRUMENTS & LENSES
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<PAGE>   1
 
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                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549
                            ------------------------

                               AMENDMENT NO. 1 TO
                                   FORM 10-K
(MARK ONE)
      [X]   ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
        SECURITIES EXCHANGE ACT OF 1934
 
                    FOR THE FISCAL YEAR ENDED JUNE 30, 1998
 
                                       OR
 
      [ ]   TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
        SECURITIES EXCHANGE ACT OF 1934
 
        FOR THE TRANSITION PERIOD FROM                TO
 
                           COMMISSION FILE NO. 0-9992
                            ------------------------
 
                             KLA-TENCOR CORPORATION
             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)
 
<TABLE>
<S>                                            <C>
                   DELAWARE                                      04-2564110
       (STATE OR OTHER JURISDICTION OF              (I.R.S. EMPLOYER IDENTIFICATION NO.)
        INCORPORATION OR ORGANIZATION)
 
     160 RIO ROBLES SAN JOSE, CALIFORNIA                           95134
   (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)                      (ZIP CODE)
</TABLE>
 
       REGISTRANT'S TELEPHONE NUMBER, INCLUDING AREA CODE: (408) 875-4200
          SECURITIES REGISTERED PURSUANT TO SECTION 12(b) OF THE ACT:
 
<TABLE>
<S>                                            <C>
             TITLE OF EACH CLASS                 NAME OF EACH EXCHANGE ON WHICH REGISTERED
                     NONE                                           NONE
</TABLE>
 
                            ------------------------
 
          SECURITIES REGISTERED PURSUANT TO SECTION 12(g) OF THE ACT:
                         COMMON STOCK, $0.001 PAR VALUE
                          COMMON STOCK PURCHASE RIGHTS
                                (TITLE OF CLASS)
 
    Indicate by check mark whether the registrant: (1) has filed all reports
required to be filed by Section 13 or 15(d) of the Securities Exchange Act of
1934 during the preceding 12 months (or for such shorter period that the
Registrant was required to file such reports), and (2) has been subject to such
filing requirements for the past 90 days.  Yes [X]    No [ ]
 
    Indicate by check mark if disclosure of delinquent filers pursuant to Item
405 of Regulation S-K is not contained herein, and will not be contained, to the
best of registrant's knowledge, in definitive proxy or information statements
incorporated by reference in Part III of this Form 10-K or any amendment to this
Form 10-K. [ ]
 
    The aggregate market value of the voting stock held by non-affiliates of the
registrant based upon the closing price of the registrant's stock, as of
September 18, 1998, was $1,313,690,577. Shares of common stock held by each
officer and director and by each person or group who owns 5% or more of the
outstanding common stock have been excluded in that such persons or groups may
be deemed to be affiliates. This determination of affiliate status is not
necessarily a conclusive determination for other purposes.
 
    The registrant had 87,321,556 shares of Common Stock outstanding as of
September 18, 1998.
 
                      DOCUMENTS INCORPORATED BY REFERENCE
 
    Portions of the Annual Report to Stockholders for the fiscal year ended June
30, 1998 ("1998 Annual Report to Stockholders") are incorporated by reference
into Parts I, II and IV of this Report. Portions of the Proxy Statement for the
Annual Meeting of Stockholders ("Proxy Statement") to be held on November 17,
1998, and to be filed pursuant to Regulation 14A within 120 days after
registrant's fiscal year ended June 30, 1998, are incorporated by reference into
Part III of this Report.
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<PAGE>   2
                                     PART I


ITEM 1. DESCRIPTION OF BUSINESS

THE COMPANY

        General. Effective April 30, 1997, Tencor Instruments ("Tencor") merged
into a wholly-owned subsidiary of KLA Instruments Corporation ("KLA"). Following
the Merger, KLA changed its name to KLA-Tencor Corporation (the "Company"). The
Merger brought together two companies with largely complementary product lines
which provide customers with yield management solutions and process monitoring
products throughout the semiconductor manufacturing process. The Company was
incorporated in Delaware in July 1975. Its headquarters are located at 160 Rio
Robles, San Jose, California, 95134, telephone (408) 875-4200.

        As the complexity of the sub-micron semiconductor manufacturing process
increases, the need for more, and more effective, process monitors also
increases. Quickly attaining and then maintaining high yields is one of the most
important determinants of profitability in the semiconductor industry. The
importance of high yields from the manufacturing process has grown dramatically
as wafer sizes increase and process geometries decrease. Total yield management
solutions have taken on a significance which has not been experienced in the
past. The Company is in a unique position to be the single source for
comprehensive yield management solutions with a portfolio of
applications-focused technologies and dedicated yield consulting expertise.

        The Company is the leader in the design, manufacture, marketing and
service of yield management and process monitoring systems for the semiconductor
industry. The Company uses its technical expertise and understanding of customer
needs to supply unique yield management solutions and one of the broadest lines
of wafer inspection, thin film measurement, metrology and reticle inspection
systems available in the semiconductor industry. The Company's systems are used
to analyze product and process quality at critical steps in the manufacturing
process for integrated circuits and to provide feedback to its customers so that
fabrication problems can be identified, addressed and contained. This
understanding of defect sources and how to contain them enables semiconductor
manufacturers to increase yields. Semiconductor fabrication facilities are
increasingly expensive to build and equip. Yield management and process
monitoring systems, which typically represent a small percentage of the total
investment required to build and equip a fabrication facility, enable integrated
circuit manufacturers to leverage these expensive facilities and improve their
returns on investment.

        The Company's principal market is the semiconductor industry, marketing
and selling products worldwide to all of the major semiconductor manufacturers.
The Company's revenues are derived primarily from product sales, principally
through its direct sales force, and to a lesser extent, through distributors.


<PAGE>   3
Yield Management Solutions Group

        Maximizing yields, or the number of good die per wafer, is a key goal of
modern semiconductor manufacturing. Higher yields increase the revenue a
manufacturer can obtain for each semiconductor wafer processed. As geometry
linewidths decrease, yields become more sensitive to the size and density of
defects. Semiconductor manufacturers use yield management and process monitoring
systems to improve yields by identifying defects, by analyzing them to determine
process problems, and, after corrective action has been taken, by monitoring
subsequent results to ensure that the problem has been contained. Monitoring and
analysis often take place at various points in the fabrication process as wafers
move through a production cycle consisting of hundreds of separate process
steps.

        The following are some of the methods used to manage yield, all of which
require the capture and analysis of data gathered through many measurements:

        -       Engineering analysis is performed off the manufacturing line to
                identify and analyze defect sources. Engineering analysis
                equipment operates with very high sensitivity to enable
                comprehensive analysis of wafers. Because they operate off-line,
                engineering analysis systems do not require high operational
                speeds.

        -       In-line monitoring is used to review the status of circuits
                during production steps. Information generated is used to
                determine whether the fabrication process steps are within
                required tolerances and to make any necessary process
                adjustments in real-time before wafer lots move to subsequent
                process stations. Because the information is needed quickly to
                be of greatest value, in-line monitoring requires both high
                throughput and high sensitivity.

        -       Pass/fail tests are used at several steps in the manufacturing
                process to evaluate products. For example, a pass/fail test is
                used to determine whether reticles used in photolithography are
                defect-free; electrical pass/fail testing is performed at the
                end of the manufacturing process to determine whether products
                meet performance specifications.

        The most significant opportunities for yield improvement generally occur
when production is started at new factories and when new products are first
built. Equipment that helps a manufacturer quickly increase new product yields
enables the manufacturer to offer these new products in volume at a time when
they are likely to generate the greatest profits.

Wafer Inspection Group

        The Company created the market for automated defect inspection of
semiconductor wafers over 13 years ago. The wafer inspection group product
offerings include unpatterned wafer inspection and patterned wafer inspection
tools which are used to find, count and characterize particles and pattern
defects on wafers both in engineering applications and in-line at various 


                                       2


<PAGE>   4
stages during the semiconductor and wafer manufacturing processes. Semiconductor
manufacturers use wafer inspection systems to monitor their manufacturing
processes and to refine those processes to increase the yield of acceptable
integrated circuits. Accordingly, semiconductor manufacturers base their
purchase of wafer inspection systems on a variety of criteria, including
sensitivity, throughput, total cost of ownership, ease of use, degree of
automation, system repeatability and correlation and its ability to be
integrated into overall yield management systems.

        In 1992, the Company introduced the 21XX inspection systems providing
the sensitivity required for microprocessors and other logic devices as well as
both the logic and repeating array portions of memory devices. Subsequent
upgrades with each new model provided greater sensitivity and greater maximum
speed compared to its predecessor. The 2135 was introduced in 1996 with twice
the throughput and higher sensitivity compared to its predecessor. In 1997, the
Company introduced the 2138, a new patterned wafer inspection system with
advanced capability for demanding inspection applications. It is based on the
21XX inspection platform and combines an ultra- broadband illumination source
and significantly improved bright field optics with Segmented Auto Thresholding.
This combination significantly increases defect sensitivity and capture, while
reducing or eliminating false defect counts in semiconductor processes. In 1998,
the 2230 was introduced offering combined darkfield illumination with high-speed
image processing for production line monitoring of yield limiting defects.

        The Company's Surfscan(R) family of laser-scanning products are widely
used for wafer qualification, process monitoring and equipment monitoring. They
provide the high sensitivity, fast throughput and low cost of ownership required
in a production environment and are used in virtually all semiconductor
manufacturing processes. Surfscans are key components of the defect reduction
strategies of many leading semiconductor manufacturers. The systems use a
standardized file format that allow defect location data to be easily
transferred to off-line review stations for defect classification. The Surfscan
AIT is the cost/performance leader for in-line monitoring of deposited films.
The Surfscan AIT, the 2138 and the 2230 are part of the Company's Intelligent
Line Monitoring solution, which includes the full line of patterned wafer
inspection systems, as well as the IMPACT/Online automatic defect classification
(ADC), CRS/Offline ADC, Quest and Klarity defect data analysis systems. This
integrated yield management approach provides semiconductor device manufacturers
with a comprehensive tool set which enables the acceleration of time-to-yield
enhancements and yield goals. The SP1, introduced in 1997, was the Company's
first system to address the unique unpatterned inspection requirements of 300mm
wafers, combining a stationary illumination beam, uniform axi-symmetric
collection optics and an optional bright field channel with a rotating wafer
scheme to allow detection of surface defects and contaminants at speeds of 100
wafers per hour on 300mm wafers, and 150 wafers per hour on 200mm wafers. It
performs rapid, highly sensitive inspection of unpatterned 300mm wafers,
providing capabilities critical to wafer and equipment manufacturers who are
developing products for emerging 0.25 micron process technologies and below.


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<PAGE>   5
        The Company offers analysis systems comprised of database management
hardware and software to translate raw inspection data into patterns which
reveal process problems. The Company's productivity and analysis software
systems collect, store and analyze data collected by test equipment manufactured
by both the Company and others to provide semiconductor manufacturers with an
integrated yield management solution. The software systems identify defect
sources, show defect trends and help semiconductor manufacturers develop
long-term yield improvement strategies.


E-Beam Technology, CD and Overlay Group

        As feature sizes of semiconductor circuits continue to decrease for
leading edge semiconductor products, the Company believes that conventional
optical technologies ultimately will begin to reach physical limits imposed by
the wavelength of light and fail to provide the necessary inspection resolution.
Working closely with those customers with the most advanced inspection
requirements, the Company has developed the SEMSpec, the industry's only fully
automatic defect electron beam inspection system. The development of these
systems was funded in part by customer-sponsored research and development
programs. The Company expects the market for these inspection systems to emerge
slowly.

        The Company's E-Beam metrology business has an established position in
the Critical Dimension Scanning Electron Microscope (CD-SEM) inspection market,
a market which the Company believes is larger than the optical overlay market,
and one which it believes will grow as semiconductor manufacturers continue to
produce more complex semiconductor devices. The Company's first generation
E-Beam metrology system features high throughput and automated setup. The new
8100XP series is used for precision measurement of high aspect ratio structures
in highly automated process control applications.

        Lithography for sub-micron semiconductor fabrication requires
increasingly stringent overlay and critical dimension tolerances. In particular,
decreasing linewidths, larger die sizes, and additional layers have made overlay
mis-registration errors a crucial cause of yield loss. To address these
challenges, the Company offers the 5000 series metrology systems: the 5100 for
overlay, and the 5105 for both overlay and critical dimension measurement. In
1996, the Company introduced the 5200 overlay system, which has performance and
usability enhancements compared to the 5100.

        The Company, utilizing its expertise in digital image processing, has
developed sophisticated measurement algorithms for the 5000 series that are more
tolerant of process variations. Using coherence probe microscopy, the system
scans the image-forming coherence region through the wafer plane, only gathering
information from in-focus surfaces. As a result, measurements are more tolerant
of process and substrate reflectivity variations than those from ordinary
optical systems. The precision measurements from the 5000 series identify the
magnitude and direction of overlay mis-registration errors arising from the
stepping process and 


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<PAGE>   6
from optical distortion inherent in the stepper lens. Based upon these
measurements, users can fine-tune the stepper program to compensate for these
errors, and improve process yield.

Precision Measurement Group

        Reticle Inspection. RAPID, the Company's original business unit, created
the market for automated inspection of reticles and photomasks for the
semiconductor manufacturing industry over 20 years ago and continues to have a
predominant share of this market. During photolithography, a stepper projects a
circuit pattern from a reticle onto a wafer. Error-free reticles are the first
step in ensuring high yields in the manufacturing process because defects in
reticles can translate into millions of ruined die.

        The Company's 3XX product family incorporates a reference database
generator and data preparation system which give full die-to-database
functionality to the inspection, permitting inspection against the ideal reticle
pattern as specified by the user's CAD program. The Company has continued to
develop enhancements to the 3XX inspection system to improve performance,
serviceability and reliability. In 1997, the Company introduced two new reticle
and photomask inspection enhancements, the Advanced Performance Algorithm (APA)
and the STARlight High Resolution option. These enhancements enable highly
accurate and reliable inspection of next- generation 0.25 micron reticles,
including reticles with complex optical proximity correction geometries. In
1998, the 353UV automated reticle inspection system was introduced which allows
for ultraviolet-based inspection providing the sensitivity levels necessary on
complex reticles designed for 0.25 micron and below design-rule applications.

        Film Measurement. The Company's film measurement division produces both
film thickness and resistivity measurement tools. The film thickness products
are used to measure a variety of optical properties of thin films, while the
resistivity products measure the resistivity of the various layers used to make
integrated circuits. These products are used to control a wide range of wafer
fabrication steps, where within-wafer and wafer-to-wafer uniformity of the
process is of paramount importance to semiconductor manufacturers to achieve
high yields at the lowest possible cost.

        The Company has been a leader in the thin film market since entering it
over 12 years ago. In 1995, the Company introduced the UV-1250SE, which brought
a powerful new technology, spectroscopic ellipsometry, to production. Continuing
innovations resulted in the UV-1280SE with one of the most robust measurement
capabilities in the industry. The use of thin film systems throughout the
manufacturing facility creates significant challenges in measurement flexibility
(especially on new film materials and multi-layer films), recipe management and
factory floor computer automation. The Company's UV product line, which has an
installed base of over 500 systems has addressed these requirements by
delivering powerful measurement engines in reliable, easy to use system designs.
The systems also incorporate software which enables extensive use of host
computer operation to control the equipment, analyze the data and 


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<PAGE>   7
feedback to the process equipment, all steps which are critical for effective
process control and maintaining high yields.

        Surface Metrology. Stylus profilers are used to measure the surface
topography of films and etched surfaces and are used in basic research and
development as well as production and quality control areas. In addition, the
Company produces stress measurement systems which detect reliability related
problems such as film cracking, voiding and lifting. The Company recently
introduced a new high-resolution profiler (HRP) product which significantly
increased the potential applications for surface profilers because it is the
first metrology system to offer the combined monitoring capability traditionally
achieved by two different instruments, an in-line profiler for measuring wide
spatial problems such as dishing and erosion and the off-line atomic force
microscope for the nanoscale problem of plug recess.

CUSTOMERS

        The Company sells its systems to all of the world's major semiconductor
manufacturers. In fiscal 1998, 1997 and 1996, no single customer accounted for
more than 10% of the Company's revenues.

INTERNATIONAL REVENUES

        The Company has wholly-owned foreign subsidiaries or foreign branches of
domestic subsidiaries in Japan, Korea, Taiwan, Europe, Israel, Singapore and
Malaysia for marketing, sales and service of products. In addition, the Company
has manufacturing operations in Israel for its metrology products. International
sales accounted for approximately 56%, 65% and 66% of the Company's revenues in
fiscal 1998, 1997 and 1996, respectively. For information regarding the
Company's revenues from foreign operations for the Company's last three fiscal
years, see Note 8 of Notes to Consolidated Financial Statements incorporated
herein by reference to Exhibit 13.1 hereto.

        The Company believes that foreign sales will continue to be a
significant percentage of revenues. The future performance of the Company will
be dependent upon, in part, its ability to continue to compete successfully in
Asia, one of the largest markets for the sale of yield management services in
process monitoring equipment. The Company's ability to compete in this area in
the future is dependent upon the continuation of favorable trading relationships
between the region (especially Japan and Korea) and the United States and the
continuing ability of the Company to maintain satisfactory relationships with
leading semiconductor companies in the region. International sales and
operations may be adversely affected by imposition of governmental controls,
restrictions on export technology, political instability, trade restrictions,
changes in tariffs and the difficulties associated with staffing and managing
international operations. In addition, international sales may be adversely
affected by the economic conditions in each country. The revenues from the
Company's international business may be affected by fluctuations in currency
exchange rates. Although the Company attempts to manage near term 


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<PAGE>   8
currency risks through "hedging," there can be no assurance that such efforts
will be adequate. These factors could have a material adverse effect on the
Company's future business and financial results.

SALES, SERVICE AND MARKETING

        The Company believes that the size and location of its field sales,
service and applications engineering organization represents a competitive
advantage in its served markets. In the United States, Europe, Asia Pacific and
Japan the Company has a direct sales force although in the past it has used a
mix of direct sales and distributor/sales representative arrangements. The
Company maintains an export compliance program that fully meets the requirements
of the U.S. Department of Commerce and the Department of State. The Company does
not consider its business to be seasonal in nature, but it is cyclical with
respect to the capital equipment procurement practices of major semiconductor
manufacturers and is impacted by the investment patterns of such manufacturers
in different global markets.

        The Company's sales, service and applications facilities throughout the
world employ over 1,700 sales, service and applications engineers. The Company
maintains sales and service offices throughout the United States and in Japan,
Korea, Taiwan, Singapore, Europe and Israel.

RESEARCH AND DEVELOPMENT

        The market for yield management and process monitoring systems is
characterized by rapid technological development and product innovation. The
Company believes that continued and timely development of new products and
enhancements to existing products are necessary to maintain its competitive
position. Accordingly, the Company devotes a significant portion of its
personnel and financial resources to research and development programs and seeks
to maintain close relationships with customers to remain responsive to their
needs. In order to meet continuing developments in the semiconductor industry
the Company is committed to significant engineering efforts for product
improvement and new product development. New product introductions may
contribute to fluctuations in operating results, since customers may defer
ordering products from existing product lines. If new products have reliability
or quality problems, reduced orders, higher manufacturing costs, delays in
acceptance of and payment for new products and additional service and warranty
expense may result. On occasion, the Company has experienced reliability and
quality problems in connection with certain product introductions, resulting in
some of these consequences. There can be no assurance that the Company will
successfully develop and manufacture new hardware and software products or that
new hardware and software products introduced by the Company will be accepted in
the marketplace. If the Company does not successfully introduce new products,
its results of operations will be adversely affected. For information regarding
the Company's research and development expense during the last three fiscal
years, see Management's Discussion and Analysis of Results of Operations and
Financial Condition incorporated herein by reference to Exhibit 13.1 hereto.


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<PAGE>   9
MANUFACTURING

        The Company's principal manufacturing activities take place in San Jose
and Milpitas, California and Migdal Ha'Emek, Israel, and consist primarily of
manufacturing, assembling and testing components and subassemblies which are
acquired from third party vendors and then integrated into the Company's
finished products. The Company employs over 1,900 manufacturing and engineering
personnel and also cross-trains personnel in order to respond to changes in
product mix.

        Many of the components and subassemblies are standard products, although
certain items are made to Company specifications. Certain of the components and
subassemblies included in the Company's systems are obtained from a single
source or a limited group of suppliers. Those parts subject to single or limited
source supply are routinely monitored by management and the Company endeavors to
ensure that adequate supplies are available to maintain manufacturing schedules,
should supply for any part be interrupted. Although the Company seeks to reduce
its dependence on sole and limited source suppliers, in some cases the partial
or complete loss of certain of these sources could disrupt scheduled deliveries
to customers and have a material adverse effect on the Company's results of
operations and damage customer relationships.

COMPETITION

        The worldwide market for yield management and process control systems is
highly competitive. In each of the markets it serves, the Company faces
competition from established and potential competitors, some of which may have
greater financial, engineering, manufacturing and marketing resources than the
Company. The Company believes that to remain competitive it will require
significant financial resources in order to offer a broad range of products, to
maintain customer service and support centers worldwide, and to invest in
product and process research and development. The semiconductor equipment
industry is becoming increasingly dominated by large manufacturers such as
Applied Materials, Inc., Hitachi Electronics Engineering Co., Ltd. and Tokyo
Electron Limited, who have the resources to support customers on a worldwide
basis. Some of these competitors have substantially greater financial resources
and more extensive engineering, manufacturing, marketing and customer service
and support capabilities than the Company. The Company expects its competitors
to continue to improve the design and performance of their current products and
processes and to introduce new products and processes with improved price and
performance characteristics. No assurance can be given that the Company will be
able to continue to compete successfully against its competitors.

        Significant competitive factors in the market for yield management and
process control systems include system performance, ease of use, reliability,
installed base and technical service and support. The Company believes that,
while price and delivery are important competitive factors, the customers'
overriding requirement is for systems which easily and effectively incorporate
automated, highly accurate inspection capabilities into their existing
manufacturing processes, thereby enhancing productivity. The Company's yield
management and process 


                                       8


<PAGE>   10
control systems for the semiconductor industry are generally higher priced than
those of its present competitors and are intended to compete based upon
performance and technical capabilities. These systems also compete with less
expensive, more labor-intensive manual inspection devices.

        In addition, in configuring their fabrication plants, semiconductor
manufacturers increasingly tend to select specific items of manufacturing
equipment for all of the fabrication facilities used to produce each generation
of integrated circuits. As a result of this process, the Company's failure to
have one or more of its products selected by a semiconductor manufacturer for
use in its facilities for a particular generation of integrated circuits may
effectively eliminate sales of that product for all of that manufacturer's
fabrication plants used for that generation of integrated circuits which could
have a significant and long-term adverse effect on the Company's results of
operations. Although the Company has been relatively successful to date in these
selection decisions, not all of the Company's products have been selected by
each of its customers for fabrication facilities for each generation of
integrated circuits. Further, there can be no assurance that the Company's
products will be selected in the future, or that the Company will continue to be
as successful in connection with selection processes as it has been to date.

PATENTS AND OTHER PROPRIETARY RIGHTS

        The Company protects its proprietary technology through a variety of
intellectual property laws including patent, copyright and trade secrets law;
however, the Company believes that, due to the rapid pace of innovation within
the yield management and process control systems industry, its protection of
patent and other intellectual property rights is less important than factors
such as its technological expertise, continuing development of new systems,
market penetration and installed base and the ability to provide comprehensive
support and service to customers. There can be no assurance that the Company
will be able to protect its technology or that competitors will not be able to
develop similar technology independently.

        The Company currently holds 117 U.S. patents and has applied for 78
additional patents in the United States. In addition, the Company has 28 foreign
patents and applied for 85 additional foreign patents. From time to time the
Company acquires license rights under U.S. and foreign patents and other
proprietary rights of third parties. No assurance can be given that patents will
be issued on any of the Company's applications, that license assignments will be
made as anticipated or that the Company's patents, licenses or other proprietary
rights will be sufficiently broad to protect its technology. In addition, no
assurance can be given that any patents issued to or licensed by the Company
will not be challenged, invalidated or circumvented or that the rights granted
thereunder will provide a competitive advantage to the Company.

BACKLOG

        At June 30, 1998, the Company's backlog for systems totaled $424
million, compared to $573 million at June 30, 1997. In general, systems ship
within six months to a year after receipt 


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<PAGE>   11
of a customer's purchase order. The Company expects to fill the present backlog
of orders during fiscal 1999. All orders are subject to cancellation or delay by
the customer with limited or no penalty. The Company's backlog is not
necessarily indicative of actual sales for any succeeding period.

EMPLOYEES

        As of June 30, 1998, the Company employed a total of approximately 4,500
persons. None of the Company's employees are represented by a labor union. The
Company has experienced no work stoppages and believes that its employee
relations are good.

        Competition in the recruiting of personnel in the semiconductor and
semiconductor equipment industry is intense. The Company believes that its
future success will depend in part on its continued ability to hire and retain
qualified management, marketing and technical employees.

ITEM 2. PROPERTIES

        Certain information concerning the Company's properties at June 30, 1998
is set forth below:


<TABLE>
<CAPTION>
   LOCATION             Type                 Principal use                                Footage    Ownership
   --------             ----                 -------------                                -------    ---------
<S>                   <C>               <C>                                               <C>        <C>
San Jose, CA          Office,           Corporate Headquarters, Research and              519,382     Leased
                      plant and         Engineering, Marketing, Manufacturing, Sales
                       warehouse        and Service and Sales Administration              233,699      Owned
Milpitas, CA          Office,           Research and Engineering, Marketing,              572,670      Lease
                      plant and         Manufacturing, Sales and Service and Sales
                      warehouse         Administration
Scotts Valley, CA     Office, plant     Research and Development                            9,945      Leased
Austin, TX            Office            Sales and Service, Training                        37,074      Leased
Richardson, TX        Office            Sales and Service, Training                        28,474      Leased
Basingstoke and       Office, plant     Sales and Service, Warehouse                       16,475      Leased
 Wokingham, England
Grenoble, Bretonneux  Office            Sales and Service                                  14,798      Leased
and Evry, France
Dresden and Pucheim   Office            Sales and Service                                  14,975      Leased
Germany
Naruse, Japan         office            Sales and Service                                  29,107      Leased
Yokohama, Japan       office            Sales and Service                                  56,967      Leased
Seoul, Korea          office            Sales and Service                                  17,558      Leased
Hsinchu, Taiwan       office            Sales and Service                                  14,892      Leased
Migdal Ha'Emek and    office            Research and Engineering, Marketing,              56,057      Leased
 Herzliya, Israek                       Manufacturing and Sales and Service and
                                        Sales Administration
</TABLE>


        The Company leases several other facilities under operating leases that
expire at various times through June 30, 2012 with renewal options at the fair
market value for additional periods up to five years. See Note 7 to Notes to
Consolidated Financial Statements in Exhibit 13.1 hereto.


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<PAGE>   12
ITEM 3.        LEGAL PROCEEDINGS

        None.

ITEM 4.        SUBMISSION OF MATTERS TO A VOTE OF SECURITY HOLDERS

        None.

                                     PART II


ITEM 5.        MARKET FOR THE REGISTRANT'S COMMON STOCK AND RELATED
               STOCKHOLDER MATTERS

        The information required by this Item is incorporated herein by
reference to Exhibit 13.1 hereto.


ITEM 6.        SELECTED FINANCIAL DATA

        The information required by this Item is incorporated herein by
reference to Exhibit 13.1 hereto.


ITEM 7.        MANAGEMENT'S DISCUSSION AND ANALYSIS OF RESULTS OF
               OPERATIONS AND FINANCIAL CONDITION

        Management's Discussion and Analysis of Results of Operations and
Financial Condition is incorporated herein by reference to Exhibit 13.1 hereto.

ITEM 7A.       QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

        The information required by this item is incorporated herein by
reference to Exhibit 13.1 hereto.

ITEM 8.        FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA

        The consolidated financial statements are incorporated herein by
reference to Exhibit 13.1 hereto.

ITEM 9.        DISAGREEMENTS ON ACCOUNTING AND FINANCIAL DISCLOSURE

     Not Applicable.

                                    PART III

ITEM 10.       DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

        Set forth below are the names of the present directors and executive
officers of the 


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<PAGE>   13
Company, their ages and positions held with the Company. Additional information
required by Item 405 of Regulation S-K of the Securities Act of 1933, as
amended, is incorporated herein by reference to the Company's Proxy Statement.


<TABLE>
<CAPTION>
NAME                        AGE                          POSITION
- ----                        ---                          --------
<S>                         <C>                    <C>
Jon D. Tompkins              58                    Chairman of the Board
Kenneth Levy                 55                    Chief Executive Officer and Director
Kenneth L. Schroeder         52                    President and Chief
                                                   Operating Officer and Director
Robert J. Boehlke            57                    Executive Vice President and Chief Financial
                                                   Officer
Frederick A. Ball            36                    Vice President Finance and Accounting
Lisa C. Berry                40                    Vice President and General Counsel
Gary E. Dickerson            41                    Executive Vice President, Yield Management
                                                   Solutions
Edward C. Grady              51                    Executive Vice President, Precision
                                                   Measurement Group
Samuel A. Harrell            58                    Senior Vice President, Strategic Business
                                                   Development
Neil Richardson              43                    Executive Vice President, E-Beam Technology,
                                                   CD and Overlay Group
Magnus O. W. Ryde            42                    Vice President, Worldwide Sales Operations
Arthur P. Schnitzer          55                    Executive Vice President, Human Resources
Graham J. Siddall            51                    Executive Vice President Wafer Inspection
                                                   Group
James W. Bagley              59                    Director
Edward W. Barnholt           55                    Director
Leo J. Chamberlain           68                    Director
Richard J. Elkus, Jr.        63                    Director
Dean O. Morton               66                    Director
Yoshio Nishi                 58                    Director
Samuel Rubinovitz            68                    Director
Dag Tellefsen                56                    Director
Lida Urbanek                 55                    Director
</TABLE>


        Kenneth Levy is a founder of the Company and since July 1, 1998 has been
Chief Executive Officer and a Director. From 1975 until April 30, 1997 he was
Chairman of the Board and Chief Executive Officer. From April 30, 1997 until
June 30, 1998 he was Chairman of the Board. He currently serves on the boards of
directors of Ultratech Stepper, Inc. and Integrated Process Equipment
Corporation.

        Jon D. Tompkins has been Chairman of the Board since July 1, 1998. From
April 30, 1997 until July 1, 1998 he was Chief Executive Officer and a Director
of the Company. From 1991 until 


                                       12


<PAGE>   14
April 30, 1997 he was President and Chief Executive Officer of Tencor
Instruments, a manufacturer of wafer inspection, film measurement and metrology
systems for the semiconductor industry ("Tencor") prior to its merger with the
Company in April 1997 (the "Merger"). He was a director of Tencor from 1991
until April 1997 and was appointed chairman of the board of directors of Tencor
in November 1993. He currently serves on the boards of directors of Varian
Corporation and ESI Incorporated as well as chairman of the board of
SEMI/SEMATECH, a private research and development consortium of U.S.
semiconductor equipment and materials companies.

        Kenneth L. Schroeder has been President, Chief Operating Officer and
Director of the Company since November 1991. He currently serves on the board of
directors of GaSonics International.

        Robert J. Boehlke has been Vice President and Chief Financial Officer of
the Company since July 1990. In April 1997 he was promoted to Executive Vice
President. He currently serves on the board of directors of LTX Corporation and
Fluorware Corporation.

        Frederick A. Ball became Vice President Finance and Accounting of the
Company on April 30,1997 as a result of the Merger. He joined Tencor as
corporate controller in March 1995 and was promoted to corporate vice president
and appointed corporate secretary in January of 1996. Prior to Tencor, Mr. Ball
was with Price Waterhouse LLP for ten years.

        Lisa C. Berry joined the Company in September 1996 as Vice President and
General Counsel. Ms. Berry joined the Company from LSI Logic Corporation, a
manufacturer of application specific integrated circuits, where she held the
positions of associate general counsel from October 1994 until September 1996
and assistant general counsel from August 1991 until October 1994.

        Gary E. Dickerson joined the Company in January 1986 and has held a
series of positions. In July 1990 he was promoted to Director of Marketing and
Vice President of Marketing in July 1992. In July 1993, he was promoted to Vice
President and Director of the Wafer Inspection Group. In January 1996, he was
promoted to Group Vice President. In 1997, Mr. Dickerson became Executive Vice
President of the newly formed Yield Management Solutions Group.

        Edward C. Grady joined the Company in December 1994 as Vice President of
Advanced Programs. He took the position of Vice President of Marketing in July
1995 until March 1996. In March 1996 until August 1998 he was Vice President and
General Management of the RAPID Division. In August 1998 he was promoted to
Executive Vice President of the Precision Measurement Group.

        Dr. Samuel A. Harrell joined the Company in September 1995 as Senior
Vice President of Strategic Business Development. Dr. Harrell is responsible for
strategic corporate development. Dr. Harrell served from October 1992 to
December 1995 as the senior vice president and chief 


                                       13


<PAGE>   15
strategy officer of SEMATECH. From August 1987 to September 1992 he served as
president of SEMI/SEMATECH.

        Dr. Neil Richardson joined the Company in June 1993 as Vice President
and General Manager of the Metrology Division. He became Executive Vice
President of the Metrology Group (of the combined operations of the Company and
Tencor as a result of the Merger) in 1997. He served as vice president and
general manager of the Diagnostic Systems Group of Schlumberger Technologies
from September 1985 to November 1991, and was the corporate technology adviser
for Schlumberger Ltd., a manufacturer of electronic test equipment, from
November 1991 to May 1993.

        Magnus O.W. Ryde joined the Company in June 1980 and has held a series
of positions. In 1991, Mr. Ryde became Vice President of Operations for the
Company's ATS division. He was promoted to Vice President and General Manager of
the Customer Support division in July 1992. In July 1995, he became Vice
President for the United States and European Sales Organizations. In July 1997
he was promoted to Vice President of Worldwide Field Operations.

        Arthur P. Schnitzer joined the Company in July 1978 and has held a
series of positions. In 1989 he was promoted to Vice President and General
Manager of the Wisard division. In July 1993, he became Group Vice President
responsible for RAPID, SEMSPEC, PRISM and manufacturing for WISARD and RAPID.
Since June 1997 he has been Executive Vice President, Human Resources.

        Dr. Graham J. Siddall was appointed Executive Vice President of the
Wafer Group (of the combined operations of the Company and Tencor as a result of
the Merger) in April 1997. In December 1995, he was appointed executive vice
president and chief operating officer of Tencor. Previously Dr. Siddall served
as senior vice president for the Tencor Instruments Wafer Inspection Division
from November 1994 to December 1995. He joined Tencor as a vice president in
1988.

        James W. Bagley has been a Director of the Company since April 30, 1997.
He was a director of Tencor from June 1993 until April 30, 1997. He has been
chief executive officer and a director of Lam Research Corporation, a
manufacturer of semiconductor processing equipment, since August 1997. From May
1996 until August 1997 he was chairman of the board and chief executive officer
of OnTrak Systems, Inc. until its merger with Lam Research Corporation in August
1997. From December 1987 until December 1993, Mr. Bagley was president and chief
operating officer for Applied Materials, Inc., a manufacturer of wafer
fabrication systems to the semiconductor industry. From January 1994 until
October 1995 he was vice chairman and chief operating officer of Applied
Materials, Inc., and vice chairman from November 1995 until May 1996. Mr. Bagley
currently serves on the boards of directors of Teradyne, Inc., Kulicke & Soffa
Industries, Inc., Micron Technology, Inc., and SEMI/SEMATECH.

        Edward W. Barnholt has been a Director of the Company since 1995. Mr.
Barnholt joined Hewlett-Packard Company, a manufacturer of electronic and
computer equipment in December 


                                       14


<PAGE>   16
1966. From 1988 to 1990 he was general manager of the Electronics Instruments
Group of Hewlett-Packard Company. In July 1988, he was elected vice president
and in November 1993 he was elected senior vice president of Hewlett-Packard
Company. Mr. Barnholt is currently executive vice president and general manager
of the Test and Measurement Organization of Hewlett Packard Company.

        Leo J. Chamberlain has been a Director of the Company since 1982. He is
a private investor.

        Richard J. Elkus, Jr. has been a Director of the Company since April 30,
1997. He was executive vice president and vice chairman of the board of
directors of Tencor from February 1994 until April 30, 1997. Previously, he was
with Prometrix Corporation from September 1983 until February 1994 where he held
the positions of chairman and chief executive officer until its merger with
Tencor in February 1994. He currently serves on the boards of directors of Voyan
Technology and Lam Research Corporation.

        Dean O. Morton has been a Director of the Company since April 30, 1997.
From June 1993 until April 30, 1997 he was a director of Tencor. In October 1992
Mr. Morton retired as executive vice president, chief operating officer and a
director of Hewlett-Packard Company, where he held various positions from 1960
until his retirement. Mr. Morton currently serves as chairman of the board of
Centigram Communications Corporation and as a director of ALZA Corporation, The
Clorox Company, BEA Systems Inc. and Raychem Corporation. Mr. Morton is also a
trustee of the Metropolitan Series Fund and State Street Research Funds Group
and Portfolios Inc.

        Yoshio Nishi has been a Director of the Company since 1989. Since May
1995 he has been director of research and development and senior vice president
of the Semiconductor Group of Texas Instruments Incorporated, a manufacturer of
integrated circuits and electronic equipment. From January 1986 to April 1995 he
was director of the Silicon Process Laboratory for Hewlett-Packard Laboratories,
a semiconductor technology research facility affiliated with Hewlett-Packard
Company.

        Samuel Rubinovitz has been a Director of the Company since 1990. He
previously served as a Director of the Company from October 1979 to January
1989. From April 1989 to January 1994 he was executive vice president of EG&G,
Inc., a diversified manufacturer of scientific instruments and electronic,
optical and mechanical equipment. He currently serves on the boards of directors
of Richardson Electronics, Inc., LTX Corporation and Kronos, Inc.

        Dag Tellefsen has been a Director of the Company since 1978. He is the
general partner of the Investment Manager of Glenwood Ventures I and II, venture
capital funds. He currently serves on the boards of directors of Iwerks
Entertainment Corporation, Aptix, Metorex International and Aeneid.


                                       15


<PAGE>   17
        Lida Urbanek has been a Director of the Company since April 30, 1997.
She is a private investor. She was a director of Tencor from August 1991 until
April 30, 1997.

ITEM 11.       EXECUTIVE COMPENSATION

        The information required by this Item is incorporated by reference to
"EXECUTIVE COMPENSATION" in the Company's Proxy Statement.

ITEM 12.       SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND
               MANAGEMENT

        The information required by this Item is incorporated by reference to
"SECURITY OWNERSHIP -- Principal Stockholders and Security Ownership of
Management" in the Company's Proxy Statement.

ITEM 13.       CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS

        The information regarding "Certain Relationships and Related
Transactions" as it appears in the Proxy Statement is incorporated herein by
reference.

                                     PART IV

ITEM 14.       EXHIBITS, FINANCIAL STATEMENTS, SCHEDULES, AND REPORT ON FORM
               8-K

        (a) FINANCIAL STATEMENTS AND FINANCIAL STATEMENT SCHEDULES.

        1.      Financial Statements.

                Consolidated Balance Sheets - As of June 30, 1998 and 1997
                Consolidated Statements of Operations - For the Three Years
                Ended June 30, 1998 Consolidated Statement of Stockholders'
                Equity - For the Three Years Ended June 30, 1998 Consolidated
                Statements of Cash Flows - For the Three Years Ended June 30,
                1998 Notes to Consolidated Financial Statements Report of
                Independent Accountants

        2.      Financial Statement Schedules.

                All schedules are omitted because they are either not applicable
                or the required information is shown in the consolidated
                financial statements or notes thereto.


                                       16


<PAGE>   18
        3.      Exhibits.


<TABLE>
<CAPTION>
            EXHIBIT NO.                      DESCRIPTION
            -----------                      -----------
<S>                           <C>
               3.1            Certificate of Incorporation as amended(1)

               3.2            Bylaws, as amended(1)

               4.1            Amended and Restated Rights Agreement dated as of
                              August 25, 1996, between the Company and First
                              National Bank of Boston, as Rights Agent. The
                              Rights Agreement includes as Exhibit A, the form
                              of Right Certificate and as Exhibit B, the summary
                              of terms of Rights.(2)

               10.1           Form of Retention and Non-Competition Agreement(3)

               10.2           Form of KLA-Tencor Corporation Corporate Officers
                              Retention Plan(3)

               10.3           Form of Indemnification Agreement(4)

               10.4           1990 Outside Directors Stock Option Plan(5)

               10.5           Second Amended and Restated 1981 Employee Stock
                              Purchase Plan(6)

               10.6           Restated 1982 Stock Option Plan(7)

               10.7           Tencor Instruments Second Amended and Restated
                              1984 Stock Option Plan(8)

               10.8           Tencor Instruments Amended and Restated 1993
                              Equity Incentive Plan(8)

               10.9           Tencor Instruments 1993 Nonemployee Directors
                              Stock Option Plan(8)

               10.10          1983 Employee Incentive Stock Option Plan of
                              Prometrix Corporation(8)

               10.11          1993 Employee Incentive Stock Option Plan of
                              Prometrix Corporation(8)

               10.12          1997 Employee Stock Purchase Plan(9)

               10.13          Excess Profit Stock Plan(10)

               13.1           1998 Annual Report to Stockholders (deemed to be
                              filed except to the extent that the information is
                              specifically incorporated by reference)

               21.1           List of Subsidiaries of KLA-Tencor Corporation

               23.1           Consent of Independent Accountants

               27.1           Financial Data Schedule
</TABLE>


- ---------------------
Notes

(1)     Filed as an exhibit to the Registrant's Form 10-Q for the quarter ended
        March 31, 1997.

(2)     Filed as exhibit 1 to the Registrant's Report on Form 8-A/A, Amendment
        No. 2, to the Registration Statement on Form 8-A filed September 24,
        1996, SEC File No. 0-9992.

(3)     Filed as an exhibit to the Registrant's Registration Statement on Form
        S-4 filed March 11,1997, SEC File No.333-23075.

(4)     Filed as an exhibit to the Registrant's Annual Report on Form 10-K for
        the year ended June 30, 1997.

(5)     Filed as exhibit 4.6 to the Registrant's Annual Report on Form 10-K for
        the year ended June 30, 1991.

(6)     Filed as exhibit 10.1 to the Registrant's Registration Statement on Form
        S-8 filed January 30, 1998, SEC File No. 333-45271.


                                       17


<PAGE>   19
(7)     Filed as exhibit 10.74 to the Registrant's Registration Statement on
        Form S-8 filed March 7, 1997, SEC File No. 333-22941.

(8)     Filed as exhibits 10.1, 10.2, 10.3, 10.6 and 10.7, respectively, to the
        Registrant's Registration Statement on Form S-8 filed May 8, 1997, SEC
        File No. 333-26681.

(9)     Filed as exhibit 10.2 to the Registrant's Registration Statement on Form
        S-8 filed January 30, 1998, SEC File No. 333-45271.

(10)    Filed as exhibit 10.15 to the Registrant's Registration Statement on
        Form S-8 filed August 7, 1998, SEC File No. 333-60887.


        (b)REPORT ON FORM 8-K.

               None.


                                       18


<PAGE>   20
                                   SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange
Act of 1934, the registrant has duly caused this report to be signed on its
behalf by the undersigned, thereunto duly authorized on September 28, 1998.

                             KLA-Tencor Corporation
                             By:    /s   / Kenneth Levy
                                -------------------------------
                             Kenneth Levy, Chief Executive Officer

Pursuant to the requirements of the Securities Exchange Act of 1934, this report
has been signed below by the following persons on behalf of the registrant and
in the capacities and on the dates indicated.


<TABLE>
<CAPTION>
        Signature                             Title                                     Date
        ---------                             -----                                     ----
<S>                                 <C>                                         <C>
        /s/ Kenneth Levy            Chief Executive Officer and Director
        --------------------------  (Principal Executive Officer)               September 28, 1998
        Kenneth Levy                

        /s/ Jon D. Tompkins         Chairman of the Board and Director          September 28, 1998
        --------------------------
        Jon D. Tompkins

        /s/ Kenneth L. Schroeder    President, Chief Operating
        --------------------------  Officer and Director                        September 28, 1998
        Kenneth L. Schroeder        

        /s/ Robert J. Boehlke       Executive Vice President and
        --------------------------  Chief Financial Officer
        Robert J. Boehlke           (Principal Accounting Officer)              September 28, 1998

        /s/ James W. Bagley         Director                                    September 28, 1998
        -------------------------
        James W. Bagley

        /s/ Edward W. Barnholt      Director                                    September 28, 1998
        ----------------------
        Edward W. Barnholt

        /s/ Leo J. Chamberlain      Director                                    September 28, 1998
        ----------------------
        Leo J. Chamberlain

        /s/ Richard J. Elkus, Jr.   Director                                    September 28, 1998
        -------------------------
        Richard J. Elkus, Jr.

        /s/ Dean O. Morton          Director                                    September 28, 1998
        --------------------------
        Dean O. Morton

        /s/ Yoshio Nishi            Director                                    September 28, 1998
        --------------------------
        Yoshio Nishi

        /s/ Samuel Rubinovitz       Director                                    September 28, 1998
        --------------------------
        Samuel Rubinovitz

        /s/ Dag Tellefsen           Director                                    September 28, 1998
        --------------------------
        Dag Tellefsen

        /s/ Lida Urbanek            Director                                    September 28, 1998
        --------------------------
        Lida Urbanek
</TABLE>


                                       19


<PAGE>   21
                                  EXHIBIT INDEX


<TABLE>
<CAPTION>
          EXHIBIT NUMBER                          DESCRIPTION
          --------------                          -----------
<S>                           <C>
               13.1           1998 Annual Report to Stockholders (deemed to be
                              filed except to the extent that the information is
                              specifically incorporated by reference)

               21.1           List of Subsidiaries of KLA-Tencor Corporation

               23.1           Consent of Independent Accountants

               27.1           Financial Data Schedule
</TABLE>



<PAGE>   1
                                                                    Exhibit 13.1

                              FINANCIAL HIGHLIGHTS

                       In thousands, except per share data


<TABLE>
<CAPTION>
Year ended June 30,                          1994           1995           1996           1997           1998
                                          ----------     ----------     ----------     ----------     ----------
<S>                                       <C>            <C>            <C>            <C>            <C>       
OPERATIONS:
Revenues                                  $  376,454     $  695,950     $1,094,492     $1,031,824     $1,166,325
Income from operations                    $   55,784     $  156,609     $  296,266     $  145,832     $  164,631
Net income                                $   40,443     $  104,811     $  196,634     $  105,396     $  134,096
Basic income per share                    $     0.61     $     1.40     $     2.42     $     1.29     $     1.58
Diluted income per share                  $     0.59     $     1.34     $     2.34     $     1.24     $     1.52
Net income excluding other charges(1)     $   40,443     $  120,965     $  196,634     $  151,272     $  155,574
Diluted income per share
    excluding other charges(1)            $     0.59     $     1.54     $     2.34     $     1.78     $     1.76

YEAR END STATUS:
Cash, cash equivalents and
marketable securities                     $  174,305     $  385,040     $  468,475     $  687,249     $  723,481
Working capital                           $  277,791     $  452,350     $  591,397     $  531,313     $  605,688
Total assets                              $  430,453     $  850,406     $1,157,919     $1,343,307     $1,548,397
Stockholders equity                       $  307,334     $  652,222     $  870,999     $1,014,613     $1,197,714
</TABLE>

(1) Excludes non-recurring acquisition, merger and restructuring charges of $16
million, $61 million and $22 million in 1995, 1997 and 1998, respectively.


<PAGE>   2
                                KLA - TENCOR 1998


                      MANAGEMENT'S DISCUSSION & ANALYSIS of
                  FINANCIAL CONDITION & RESULTS of OPERATIONS


RESULTS OF OPERATIONS. Fiscal 1998 was the third consecutive year the Company
achieved revenues in excess of $1 billion. The year began with continued
recovery of the orders and shipments of process control and yield management
equipment over the previous year as many semiconductor manufacturers expanded
and upgraded existing facilities. However, in the last half of fiscal 1998,
revenue growth and operations were impacted sharply by a downturn in the
semiconductor industry driven by overcapacity and pricing pressures in the DRAM
market as well as weakness in Japan and Asia Pacific economies. These conditions
were evidenced by a shift in the Company's percent of revenues from Asia Pacific
to the United States and Western Europe. The first half of fiscal 1998 showed
marked improvements in sales in the Yield Management Solutions Group and growth
in the Company's market share of the Metrology business. While these trends have
continued throughout the year, results declined, primarily in the Wafer
Inspection Group, since new fab construction was delayed or stopped as
semiconductor manufacturers reassessed their capital spending and expansion
plans in light of the deteriorating market conditions.

Despite the market fluctuations, the financial position of the Company has
remained strong. In response to the decline in revenue growth and new order
levels, broad measures have been implemented to reduce costs and control
spending. However, the Company has continued its new product development by
investment in leading edge technologies and by strategic acquisitions. These
investments have and are expected to continue to position the Company's
extensive productline to address the critical initiatives that are key to its
customers, including the acceleration of technology to sub-quarter micron and
300 millimeter wafers. During this most recent downturn in the business cycle,
yield management and yield enhancement are more critical than ever before as
semiconductor companies strive to maintain effective low cost manufacturing
environments with reduced capital budgets.

REVENUES AND GROSS MARGINS. Revenues increased $135 million, or 13%, in 1998
versus 1997 primarily due to increased volumes of the Company's data analysis
systems sales including Automatic Defect Classification, review systems and
increased market penetration by the CD SEM model 8100. In addition, increases
were realized in Field Service revenue. These increases offset declines in the
Wafer Inspection Group's revenues during the last half of fiscal 1998. Overall
revenue declines in the second half of fiscal 1998 were driven by reduced
spending capital, particularly in the Asia Pacific region. Revenues in 1997 when
compared to 1996 declined approximately 6% due to excess capacity and lower
prices in the DRAM market which slowed semiconductor equipment purchases.

Gross margin decreased to 52.4% in 1998 from 54.3% in 1997 and 57.1% in 1996.
The decrease during the last two years was primarily due to increased
infrastructure costs of the Company's Customer Service Group and higher warranty
and installation costs related to new product introductions.

RESEARCH AND DEVELOPMENT. Net research and development (R&D) expenses were $182
million, $134 million and $116 million, or 15.6%, 13.0% and 10.6% of revenues in
1998, 1997 and 1996, respectively. The increase in dollars in 1998 compared to
1997, and in 1997 compared to 1996, is primarily attributable to increases in
headcount and project material costs associated with the Company's ongoing
efforts to develop products which address new market segments and enhancements
to existing products including next generation 300mm products and inspection
enhancements for sub-quarter micron technology.


                                       2


<PAGE>   3
SELLING, GENERAL AND ADMINISTRATIVE. Selling, general and administrative (SG&A)
expenses were $242 million, $219 million and $213 million, or 20.8%, 21.3% and
19.4% of revenues, in 1998, 1997 and 1996, respectively. The increase in dollars
in 1998 compared to 1997 can be attributed primarily to strengthening of the
worldwide sales and applications infrastructure organization. The increase in
dollars in 1997 compared to 1996 can be attributed primarily to increases in
expenses resulting from the significant efforts involved with enhancements to
the Company's information systems infrastructure.

NON-RECURRING ACQUISITION, RESTRUCTURING AND OTHER CHARGES. During fiscal 1998,
the Company acquired complementary businesses and technologies including Nanopro
GmbH, Groff Associates (dba VARS) and DeviceWare Inc. which were recorded under
the purchase method of accounting. These companies were acquired for an
aggregate amount of approximately $21 million consisting primarily of in-process
technology. Additionally, the Company acquired Amray, Inc. (Amray), which was
recorded under the pooling-of-interests method of accounting. The Company
incurred approximately $2 million in professional fees related to this
acquisition which have been included in "non-recurring acquisition,
restructuring and other charges". Amray's historical operations, net assets, and
cash flows were not material to the Company's consolidated financial results
prior to the acquisition. Excluding the non-recurring charges, the Company's
results of operations were not materially affected by these acquisitions.

During fiscal 1997, the Company recorded charges totaling $61 million for
merger, restructuring and other non-recurring events. Of this amount
approximately $46 million was the result of the merger between KLA Instruments
and Tencor Instruments on April 30, 1997, $6 million was a result of the
write-off of a Tencor bad debt and $9 million was additional restructuring
charges primarily related to lease exit costs incurred by Tencor Instruments
prior to the merger. The remaining balance of approximately $5 million will be
used in the first half of fiscal 1999.

INTEREST INCOME AND OTHER, NET. Interest income and other, net is comprised
primarily of income recognized upon settlement of certain foreign currency
contracts and interest income earned on the Company's investment and cash
portfolio. The increase over the last two years has been attributable to income
recognized upon settlement of certain foreign currency contracts and interest
resulting from higher average investment balances.

PROVISION FOR INCOME TAXES. The provision for income taxes on the Company's
pretax income was 35%, 39.4% and 37.3% in fiscal 1998, 1997 and 1996,
respectively. The Company's effective tax rate decreased to 32% in 1998
excluding the effect of non-recurring acquisition costs from 34.9% in 1997 prior
to restructuring and merger costs. This decline results primarily from
realization of tax attributes related to a prior acquisition, relatively fewer
non-deductible merger and acquisition related costs and a relative reduction in
state and foreign taxes.

LIQUIDITY AND CAPITAL RESOURCES. Working capital grew to $606 million in 1998
compared to $531 million in 1997. Major components of working capital and
liquidity continue to be the Company's $308 million in cash, cash equivalents
and short-term investments. In addition, the Company maintains $415 million in
marketable securities classified as long-term as of June 30, 1998. Cash flow
from operations was approximately $50 million in 1998, compared to operating
cash flow of approximately $236 million in 1997. The change in cash flow from
operations in 1998 compared to 1997 is primarily due to increases in inventory
and accounts receivable.

Capital expenditures for each of the fiscal years 1998, 1997 and 1996
approximated $60 million and consisted primarily of computers and manufacturing
equipment. The Company believes that the existing cash balances and short-term
investments, along with cash generated from operations, will be sufficient to
meet the Company's working capital requirements through fiscal year 1999.


                                       3


<PAGE>   4
YEAR 2000 COMPLIANCE. Many currently installed computer systems and software
products are coded to accept only two digit entries in the date code field.
These date code fields will need to accept four digit entries to distinguish
21st century dates from 20th century dates. As a result, many companies'
software and computer systems may need to be upgraded or replaced in order to
comply with such "Year 2000" requirements. The Company believes that the
majority of its products and systems are Year 2000 ready or will be brought to a
state of readiness prior to the year 2000. However, complete testing is not
feasible and hidden problems may remain. In addition, the Company utilizes
third-party equipment and software that may not be Year 2000 compliant although
these too are under evaluation and planning for Year 2000 readiness. Failure of
the companies products or third-party equipment or software to operate properly
with regard to the Year 2000 and thereafter could require the Company to incur
unanticipated expenses to remedy any problems, which could have a material
adverse effect on the Company's business and operating results. Furthermore, the
purchasing patterns of customers or potential customers may be affected by Year
2000 issues as companies expend significant resources to correct their current
systems for Year 2000 compliance. These expenditures may result in reduced funds
available to purchase products and services such as those offered by the
Company, which could have a material adverse effect on the Company's business
and operating results.

OTHER FACTORS AFFECTING COMPANY RESULTS. The Company's operating results have
fluctuated in the past and may fluctuate in the future. During the last half of
fiscal 1998 operating results have been adversely affected as the Company
experienced declines in revenues and margins and due to reduced capital
equipment spending by the semiconductor industry. This decline is primarily due
to the build up of excess semiconductor manufacturing capacity, coupled with the
Asian financial crisis. The Company's operating results are dependent on many
factors, including the economic conditions in the semiconductor and related
industries, both in the US and abroad, the size and timing of the receipt of
orders from customers, customer cancellations or delays of shipments, the
Company's ability to develop, introduce, and market new and enhanced products on
a timely basis, among others. The Company has experienced reductions in orders,
cancellations and delays in shipments which may continue to adversely affect
sales and margins in future periods. The Company expects unfavorable effects on
orders, sales and margins to persist at least through the remainder of the
calendar year and possibly beyond. The Company's expense levels are based, in
part, on expectations of future revenues. If revenue levels in a particular
period do not meet expectations operating results may be adversely affected.

The Company's business depends and will continue to depend in the future upon
the capital equipment expenditures of semiconductor manufacturers, which in turn
depend on the current and anticipated market demand for integrated circuits and
products utilizing integrated circuits. The current industry downturn has had an
adverse effect on the semiconductor industry's level of capital expenditures.
The Company believes that it is relatively well positioned for this downturn
because of its array of products, its focus on yield improvement and process
development rather than pure capacity, its sales of metrology products to
non-semiconductor industries and its strong balance sheet. Nevertheless, there
can be no assurance that the Company will be able to withstand the effects of an
industry downturn in the short term or over an extended period if the downturn
is prolonged.

Rapid technological changes in semiconductor manufacturing processes subject the
semiconductor manufacturing equipment industry to increased pressure to maintain
technological parity with deep submicron process technology. While focused on
controlling expenses to address the downturn in the semiconductor industry, the
Company continues to believe that its future success will depend in part upon
its ability to develop, manufacture and successfully introduce new products with
improved capabilities including those for 300mm wafers and devices with critical
dimensions at .25-micron and below and to continue to enhance existing products.
Due to the risks inherent in transitioning to new products, the Company will be
required to forecast demand for new products while managing the transition from
older products. There can be no assurance that the Company will successfully and
timely develop and manufacture new hardware and 


                                       4


<PAGE>   5
software products or that new hardware and software products introduced by the
Company will be accepted in the marketplace. If new products have reliability or
quality problems then reduced orders, higher manufacturing costs, delays in
collecting accounts receivable and additional service and warranty expense may
result. Additionally, there can be no assurance that future technologies,
processes or product developments will not render the Company's current product
offerings obsolete. However, if the Company does not continue to successfully
introduce new products, its results of operations will be adversely affected.
The Company expects to continue to make significant investments in research and
development and to sustain its current spending levels for customer support in
fiscal year 1999 to meet current customer requirements and effectively position
the Company for growth when the business cycle turns favorable.

The semiconductor equipment industry is highly competitive. The Company has
experienced and expects to continue to face substantial global competition. The
Company believes that to remain competitive it will require significant
financial resources in order to offer a broad range of products, to maintain
customer service and support centers worldwide, and to invest in product and
process research and development. The Company believes that the semiconductor
equipment industry is becoming increasingly dominated by large manufacturers,
who have the resources to support customers on a worldwide basis. A few of these
competitors have substantially greater financial resources and more extensive
engineering, manufacturing, marketing and customer service and support
capabilities than the Company. In addition, there are smaller emerging
semiconductor equipment companies which provide innovative technology. No
assurance can be given that the Company will be able to compete successfully
worldwide.

The Company expects that international revenues will continue to represent a
significant percentage of its net revenues. International revenues and
operations may be adversely affected by imposition of governmental controls,
restrictions on export technology, political instability, trade restrictions,
changes in tariffs and the difficulties associated with staffing and managing
international operations. In addition, international sales may be adversely
affected by economic conditions in each country. The future performance of the
Company will be dependent, in part, upon its ability to continue to compete
successfully in the Asia Pacific, one of the largest areas for the sale of yield
management and process monitoring equipment. Countries in the Asia Pacific
region, including Japan, Korea and Taiwan, have experienced weaknesses in their
currency, banking and equity markets in recent periods. These weaknesses may
continue to adversely affect demand for the Company's products, the U.S. dollar
value of the Company's foreign currency denominated sales, the availability and
supply of resources, and the Company's consolidated results of operations.
Although the Company attempts to manage near term currency risks through
"hedging," there can be no assurance that such efforts will be adequate. These
factors may have a material adverse effect on the Company's future business and
financial results.

EFFECTS OF RECENT ACCOUNTING PRONOUNCEMENTS. In June 1997, the Financial
Accounting Standards Board issued Statement No. 130, "Reporting Comprehensive
Income". This Statement establishes standards for reporting and display of
comprehensive income and its components (revenues, expenses, gains, and losses)
in a full set of general-purpose financial statements. Such items may include
foreign currency translation adjustments, unrealized gains/losses from investing
and hedging activities, and other transactions. Such items include foreign
currency translation adjustments and unrealized gains/losses from investing and
hedging activities for the Company. This Statement is required to be adopted in
the first quarter of the Company's fiscal year ending June 30, 1999.

In June 1997, the Financial Accounting Standards Board issued Statement No. 131,
"Disclosures about Segments of an Enterprise and Related Information". This
Statement establishes standards for the way that public business enterprises
report information about operating segments in annual financial statements and
requires that those enterprises report selected information about operating
segments and related disclosures about products and services, geographic areas,
and major customers in interim financial reports issued to shareholders. This
Statement is required to be adopted in the Company's fiscal year ending June 30,
1999. The effect of SFAS No. 131 will not be material to the Company's financial
statement disclosure.


                                       5


<PAGE>   6
In June 1998, the Financial Accounting Standards Board issued Statement No. 133,
"Accounting for Derivative Instruments and Hedging Activities" (SFAS 133). It
establishes accounting and reporting standards for derivative instruments
including standalone instruments, such as forward currency exchange contracts
and interest note swaps or embedded derivatives, such as conversion options
contained in convertible debt investments are requires that these instruments be
marked-to-market on an ongoing basis. The Company is required to adopt SFAS 133
in the first quarter of its fiscal year ending June 30, 2000. The effect of SFAS
No. 133 will not be material to the Company's financial statements.

MARKET RISK DISCLOSURE. At the end of fiscal 1998, the Company had an investment
portfolio of fixed income securities, excluding those classified as cash and
cash equivalents, of $458 million (see Note 4 of Notes to Consolidated Financial
Statements). These securities, like all fixed income instruments, are subject to
interest rate risk and will fall in value if market interest rates increase. If
market interest rates were to increase immediately and uniformly by 10% from
levels as of June 30, 1998, the fair value of the portfolio would decline by
approximately $5.5 million.

Other than statements of historical fact, statements made in this Annual Report
include forward looking statements, such as statements with respect to the
Company's future financial performance, operating results, plans and objectives.
Actual results may differ materially from those currently anticipated depending
on a variety of risk factors some of which are set forth in "Other Factors
Affecting Company Results" above.


                                       6


<PAGE>   7
                               KLA - TENCOR 1998


                          CONSOLIDATED BALANCE SHEETS


<TABLE>
<CAPTION>
June 30, (in thousands, except per share data)                        1997                  1998
                                                                   -----------           -----------
<S>                                                                <C>                   <C>
ASSETS

Current assets:
     Cash and cash equivalents                                     $   279,225           $   215,970
     Short-term investments                                             69,606                92,343
     Accounts receivable, net                                          269,291               304,140
     Inventories                                                       174,634               234,565
     Deferred income taxes                                              54,799                90,729
     Other current assets                                               12,452                18,624
                                                                   -----------           -----------
         Total current assets                                          860,007               956,371
                                                                   -----------           -----------

Land, property and equipment, net                                      117,595               140,937
Marketable securities                                                  338,418               415,168
Other assets                                                            27,287                35,921
                                                                   -----------           -----------
         Total assets                                              $ 1,343,307           $ 1,548,397
                                                                   -----------           -----------

LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
     Notes payable                                                 $    25,113           $    21,482
     Accounts Payable                                                   41,155                46,353
     Other current liabilities                                         262,426               282,848
                                                                   -----------           -----------
         Total current liabilities                                     328,694               350,683

Commitments and contingencies (Note 7)

Stockholders' equity:
     Common stock, $0.001 par value, 250,000 authorized,
         83,759 and 87,444 shares issued and outstanding                    84                    87
     Capital in excess of par value                                    458,224               497,496
     Retained earnings                                                 542,706               683,836
     Net unrealized gain on investments                                 17,591                26,108
     Cumulative translation adjustment                                  (3,992)               (9,813)
                                                                   -----------           -----------
         Total stockholders' equity                                  1,014,613             1,197,714
                                                                   -----------           -----------
         Total liabilities and stockholders' equity                $ 1,343,307           $ 1,548,397
                                                                   ===========           ===========
</TABLE>


See accompanying notes to consolidated financial statements.


                                       7


<PAGE>   8
                                KLA - TENCOR 1998


                        CONSOLIDATED STATEMENTS of INCOME


<TABLE>
<CAPTION>
Year ended June 30, 
(in thousands, except per share data)                       1996               1997                1998
                                                       -------------       -------------       -------------
<S>                                                    <C>                 <C>                 <C>          
Revenues                                               $   1,094,492       $   1,031,824       $   1,166,325
                                                       -------------       -------------       -------------

Costs and operating expenses:
     Cost of goods sold                                      469,681             471,910             554,917
     Engineering, research and development                   115,920             134,105             181,903
     Selling, general and administrative                     212,625             219,425             242,400
     Non-recurring acquisition, restructuring
         and other charges                                        --              60,552              22,474
                                                       -------------       -------------       -------------
         Total costs and operating expenses                  798,226             885,992           1,001,694
                                                       -------------       -------------       -------------

Income from operations                                       296,266             145,832             164,631
Interest income and other, net                                17,834              28,147              41,680
                                                       -------------       -------------       -------------

Income before income taxes                                   314,100             173,979             206,311

Provision for income taxes                                   117,466              68,583              72,215
                                                       -------------       -------------       -------------
Net income                                             $     196,634       $     105,396       $     134,096
                                                       -------------       -------------       -------------

Earnings per share:
Basic                                                  $        2.42       $        1.29       $        1.58
Diluted                                                $        2.34       $        1.24       $        1.52

Weighted average number of shares:
Basic                                                         81,148              81,943              85,097
Diluted                                                       84,195              85,203              88,522
</TABLE>


See accompanying notes to consolidated financial statements.


                                       8


<PAGE>   9
                                KLA - TENCOR 1998


                 CONSOLIDATED STATEMENTS of STOCKHOLDERS' EQUITY


<TABLE>
<CAPTION>
                                                  Common Stock and Capital
                                                   in Excess of Par Value                      Net       Cumulative
                                                  ------------------------    Retained      Unrealized  Translation
(in thousands)                                      Shares       Amount       Earnings        Gain        Adjustment         Totals
                                                  --------    -----------    -----------   -----------   -----------    -----------
<S>                                               <C>         <C>            <C>           <C>          <C>             <C>        
Balances at June 30, 1995                           80,392    $   406,810    $   240,676   $     1,241   $     3,495    $   652,222

      Net issuance under employee stock plans        1,604         15,298             --            --            --         15,298
      Repurchase of common stock                      (250)        (5,456)            --            --            --         (5,456)
      Tax benefits of stock option transactions         --          9,778             --            --            --          9,778
      Cumulative translation adjustment                 --             --             --            --        (5,439)        (5,439)
      Unrealized gain on investments, net               --             --             --         7,962            --          7,962
      Net income                                        --             --        196,634            --            --        196,634
                                                  --------    -----------    -----------   -----------   -----------    -----------
Balances at June 30, 1996                           81,746        426,430        437,310         9,203        (1,944)       870,999
      Net issuance under employee stock plans        2,013         22,235             --            --            --         22,235
      Tax benefits of stock option transactions         --          9,643             --            --            --          9,643
      Cumulative translation adjustment                 --             --             --            --        (2,048)        (2,048)
      Unrealized gain on investments, net               --             --             --         8,388            --          8,388
      Net income                                        --             --        105,396            --            --        105,396
                                                  --------    -----------    -----------   -----------   -----------    -----------
Balances at June 30, 1997                           83,759        458,308        542,706        17,591        (3,992)     1,014,613
      Net issuance under employee stock plans        2,263         34,537             --            --            --         34,537
      Repurchase of common stock                      (378)       (16,038)            --            --            --        (16,038)
      Tax benefits of stock option transactions         --         20,529             --            --            --         20,529
      Cumulative translation adjustment                 --             --             --            --        (5,821)        (5,821)
      Unrealized gain on investments, net               --             --             --         8,517            --          8,517
      Issuance of common stock in connection
         with acquisition                            1,800            247          7,034            --            --          7,281
      Net income                                        --             --        134,096            --            --        134,096
                                                  --------    -----------    -----------   -----------   -----------    -----------
Balances at June 30, 1998                           87,444    $   497,583    $   683,836   $    26,108   $    (9,813)   $ 1,197,714
                                                  ========    ===========    ===========   ===========   ===========    ===========
</TABLE>


See accompanying notes to consolidated financial statements.


                                       9


<PAGE>   10
                               KLA - TENCOR 1998


                      CONSOLIDATED STATEMENTS of CASHFLOW


<TABLE>
<CAPTION>
Year ended June 30, (in thousands)                                          1996                1997               1998
                                                                       -------------       -------------       -------------
<S>                                                                    <C>                 <C>                 <C>          
Cash flows from operating activities:
    Net income                                                         $     196,634       $     105,396       $     134,096
    Adjustments to reconcile net income to net
    cash provided by operating activities:
        Depreciation and amortization                                         24,967              52,340              38,917
        Write-off of acquired in-process technology and other
              non-recurring acquisition charges                                   --                  --              20,546
        Deferred income taxes                                                (19,704)            (17,267)            (46,225)
        Changes in assets and liabilities:
             Accounts receivable                                             (96,586)             34,859             (57,542)
             Inventories                                                     (86,538)             21,307             (62,271)
             Other assets                                                      3,815             (11,817)            (16,951)
             Accounts payable                                                 15,921              (3,580)              3,821
             Other current liabilities                                        72,760              55,094              35,866
                                                                       -------------       -------------       -------------
             Net cash provided by operating activities                       111,269             236,332              50,257
                                                                       -------------       -------------       -------------
Cash flows from investing activities:
Payments for in-process technology and other non-recurring
    acquisition charges                                                           --                  --             (18,771)
Purchase of property and equipment                                           (64,589)            (56,793)            (64,389)
Purchases of available for sale securities                                  (509,262)           (997,283)           (915,185)
Proceeds from available for sale securities                                  484,060             870,391             825,643
                                                                       -------------       -------------       -------------
             Net cash used in investing activities                           (89,791)           (183,685)           (172,702)
                                                                       -------------       -------------       -------------
Cash flows from financing activities:
Issuance of common stock, net                                                 25,076              31,878              58,440
Stock repurchases                                                             (5,456)                 --             (16,038)
Payments under debt obligations                                              (39,277)            (42,490)            (36,632)
Borrowings under debt obligations                                             45,177              35,738              33,996
                                                                       -------------       -------------       -------------
             Net cash provided by financing activities                        25,520              25,126              39,766
                                                                       -------------       -------------       -------------
Effect of exchange rate changes on cash and cash equivalents                   2,586                (252)             19,424
                                                                       -------------       -------------       -------------
Net increase (decrease) in cash and cash equivalents                          49,584              77,521             (63,255)
Cash and cash equivalents at beginning of period                             152,120             201,704             279,225
                                                                       -------------       -------------       -------------
Cash and cash equivalents at end of period                             $     201,704       $     279,225       $     215,970
                                                                       =============       =============       =============
Supplemental cash flow disclosures:
Income taxes paid                                                      $     108,196       $      68,430       $      85,394
Interest paid                                                          $       2,103       $       1,551       $       2,303
</TABLE>


See accompanying notes to consolidated financial statements.


                                       10


<PAGE>   11
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

NOTE 1 - SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES

DESCRIPTION OF THE OPERATIONS AND PRINCIPLES OF CONSOLIDATION

KLA-Tencor Corporation ("the Company") is a global provider of yield management
solutions for semiconductor manufacturing and related industries. The Company
has subsidiaries in the United States, Western Europe, Japan and Asia Pacific.
The consolidated financial statements include the financial statements of
KLA-Tencor and its wholly owned subsidiaries. All significant intercompany
transactions and accounts have been eliminated.

CASH EQUIVALENTS AND INVESTMENTS

Cash equivalents consist of highly liquid investments that are valued at
amortized cost, which approximates market value, and have original maturity
dates of three months or less from the date of acquisition. Investments include
equity and debt securities with maturities greater than three months from the
date of acquisition. The Company has classified all securities as
available-for-sale, as the sale of such securities may be required prior to
maturity to implement management strategies. Investments classified as
available-for-sale are reported at fair value with unrealized gains or losses
excluded from earnings and reported as a separate component of shareholders'
equity, net of applicable taxes, until realized.

INVENTORIES

Inventories are stated at the lower of cost (on a first-in, first-out basis) or
market. Demonstration units are stated at their manufacturing costs and reserves
are recorded to state the demonstration units at their net realizable value.

PROPERTY AND EQUIPMENT

Property and equipment are recorded at cost. Depreciation of property and
equipment is based on the straight-line method over the estimated useful lives
of the assets, which are 30 years for buildings, ten years for building
improvements, five to seven years for furniture and fixtures, and three to five
years for machinery and equipment. The life of the lease or the useful life,
whichever is shorter, is used for the amortization of leasehold improvements.

CONCENTRATION OF CREDIT RISK

Financial instruments which potentially subject the Company to credit risk
consist principally of investments, accounts receivable and financial
instruments used in hedging activities.

Investments are maintained with high quality institutions, the composition and
maturities of which are regularly monitored by management. Generally, these
securities maintain a highly liquid market and may be redeemed upon demand and,
therefore, bear minimal risk. The Company, by policy, limits the amount of
credit exposure to any one financial institution or commercial issuer. The
Company has not experienced any material losses on its investments.

A majority of the Company's trade receivables are derived from sales to large
multinational semiconductor manufacturers. Concentration of credit risk with
respect to trade receivables are considered to be limited due to its customer
base and the diversity of its geographic sales areas. The Company performs
ongoing credit evaluations of its customers' financial condition. The Company
maintains a provision for potential credit losses based upon expected
collectibility of all accounts receivable. The write-off of uncollectable
amounts has been insignificant except for the write-off of Tencor bad debt of
approximately $6 million in fiscal 1997.


                                       11


<PAGE>   12
The Company is exposed to credit loss in the event of nonperformance by
counterparties on the foreign exchange contracts used in hedging activities. The
Company does not anticipate nonperformance by these counterparties.

FOREIGN CURRENCY

The functional currencies of the Company's significant foreign subsidiaries are
the local currencies. Accordingly, all assets and liabilities of the foreign
operations are translated to U.S. dollars at current exchange rates, and
revenues and expenses are translated to U.S. dollars using weighted average
exchange rates in effect during the period. The gains and losses from foreign
currency translation of these subsidiaries' financial statements are recorded
directly into a separate component of shareholders' equity under the caption
"cumulative translation adjustment." Foreign currency transaction gains and
losses have not been significant.

The Company's foreign subsidiaries operate and sell the Company's products in
various global markets. As a result the Company is exposed to changes in
interest rates and foreign currency exchange rates. The Company utilizes foreign
currency forward exchange contracts to hedge against future movements in foreign
exchange rates that affect certain foreign currency denominated sales and
purchase transactions. The Company attempts to match the forward contracts with
the underlying items being hedged in terms of currency, amount, and maturity.
The Company does not use derivative financial instruments for speculative or
trading purposes. Because the impact of movements in currency exchange rates on
forward contracts offsets the related impact on the exposures hedged, these
financial instruments do not subject the Company to speculative risk that would
otherwise result from changes in currency exchange rates. Realized gains and
losses on forward exchange contracts are included in other income, net, which
offset foreign exchange gains or losses from revaluation of foreign
currency-denominated receivable and payable balances. The cash flows related to
gains and losses on these contracts are classified in the same category as the
hedged transactions in the Consolidated Statements of Cash Flows.

At June 30, 1998, the Company had forward exchange contracts maturing throughout
fiscal 1999 and early fiscal 2000 to sell and purchase approximately $219
million and $6 million, respectively, in foreign currency, primarily Japanese
yen. At June 30, 1997, the Company had forward contracts maturing throughout
fiscal 1998 and early 1999 to sell and purchase approximately $225 million and
$10 million, respectively, in foreign currency, primarily Japanese yen. Of these
forward exchange contracts, approximately $111 million and $5 million of
contracts hedge foreign currency assets and liabilities, respectively, carried
on the balance sheet as of June 30, 1998, and consequently the financial
statements reflect the fair market value of the contracts and their underlying
transactions. Approximately $108 million and $1 million of the contracts hedge
firm commitments for future sales and purchases, respectively, denominated in
foreign currency. The fair market value of these contracts on June 30, 1998,
based upon prevailing market rates on that date, was approximately $104 million
and $1 million, respectively. As of June 30, 1998, and based on prevailing
market rates on that date, the unrealized loss on each set of contracts was
approximately $4 million.

FAIR VALUE OF FINANCIAL INSTRUMENTS

The Company has evaluated the estimated fair value of financial instruments
using available market information and valuation methodologies. The amounts
reported as investments and bank borrowings reasonably estimate their fair
value. The fair value of the Company's cash, cash equivalents, accounts
receivable, accounts payable and other current liabilities approximates the
carrying amount due to the relatively short maturity of these items.

REVENUE RECOGNITION

The Company recognizes revenue when the product has been shipped and collection
of the resulting receivable is probable. A provision for the estimated costs of
fulfilling warranty and installation 


                                       12


<PAGE>   13
obligations is recorded at the time the related revenue is recognized. Service
and maintenance contract revenues are deferred and recognized ratably over the
period of the related contract.

NET INCOME PER SHARE

In December 1997 the Company adopted Statement of Financial Accounting Standards
No. 128, "Earnings per Share" (EPS). Under the provisions of this statement,
basic earnings per share is computed by dividing net income available to common
stockholders by the weighted average number of common shares outstanding during
the period. Diluted earnings per share is computed by using the weighted average
number of common shares outstanding during the period and gives effect to all
dilutive potential common shares outstanding during the period. The reconciling
difference between the computation of basic and diluted earnings per share for
all periods presented, is the inclusion of the dilutive effect of stock options
issued to employees under employee stock option plans.

Options to purchase approximately 1,078,708, 674,028, and 1,357,376 shares were
outstanding at June 30, 1998, 1997, and 1996 respectively, but not included in
the computation of diluted EPS because the exercise price was greater than the
average market price of common shares in each respective year. The exercise
price ranges of these options were $48.06 to $69.88, $33.81 to $48.31, and
$33.81 to $46.56 at June 30, 1998, 1997 and 1996 respectively.

MANAGEMENT ESTIMATES

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 date of the financial statements and
the reported amounts of revenues and expenses during the reporting period.
Actual results could differ from those estimates.

STOCK-BASED COMPENSATION PLANS

The Company accounts for its employee stock option plans and employee stock
purchase plan in accordance with provisions of the Accounting Principles Board's
Opinion No. 25 (APB 25), "Accounting for Stock Issued to Employees." The Company
provides additional proforma disclosure required by Financial Accounting
Standard (SFAS) No. 123, "Accounting for Stock-Based Compensation" (see Note 6).

RECLASSIFICATIONS

Certain amounts in fiscal years prior to 1998 have been reclassified to conform
to the 1998 financial statement presentation.

RECENT ACCOUNTING PRONOUNCEMENTS

In June 1997, the Financial Accounting Standards Board issued Statement No. 130,
"Reporting Comprehensive Income." This Statement establishes standards for
reporting and display of comprehensive income and its components (revenues,
expenses, gains, and losses) in a full set of general-purpose financial
statements. Such items may include foreign currency translation adjustments,
unrealized gains/losses from investing and hedging activities, and other
transactions. This Statement requires that all items that are required to be
recognized under accounting standards as components of comprehensive income be
reported in a financial statement that is displayed with the same prominence as
other financial statements. This Statement is required to be adopted in the
Company's fiscal year ending June 30, 1999. The effect of SFAS No. 130 will not
be material to the Company's financial statement disclosure.

In June 1997, the Financial Accounting Standards Board issued Statement No. 131,
"Disclosures about Segments of an Enterprise and Related Information." This
Statement establishes standards for the way that public business enterprises
report information about operating segments in annual financial statements and
requires that those enterprises report selected information about operating
segments in interim financial reports issued to stockholders. It also
establishes standards for related 


                                       13


<PAGE>   14
disclosures about products and services, geographic areas, and major customers.
This Statement is required to be adopted in the Company's fiscal year ending
June 30, 1999. The effect of SFAS No. 131 will not be material to the Company's
financial statement disclosure.

In June 1998, the Financial Accounting Standards Board issued Statement No. 133,
"Accounting for Derivative Instruments and Hedging Activities" (SFAS 133). It
establishes accounting and reporting standards for derivative instruments
including standalone instruments, such as forward currency exchange contracts
and interest note swaps or embedded derivatives, such as conversion options
contained in convertible debt investments and requires that these instruments be
marked-to-market on an ongoing basis. Along with the derivatives, the underlying
hedged items are also to be marked-to-market on an ongoing basis. These market
value adjustments are to be included either in the income statement or
stockholders' equity, depending on the nature of the transaction. The Company
currently only participates in hedge transactions of assets, liabilities and
firm commitments and does not anticipate that the adoption of this Statement
will have a material impact on the financial statements as the gains and losses
on the hedge transactions offset the losses and gains on the underlying items
being hedged. The Company is required to adopt SFAS 133 in the first quarter of
its fiscal year ending June 30, 2000.


NOTE 2 -  BALANCE SHEET COMPONENTS


<TABLE>
<CAPTION>
June 30, (in thousands)                              1997                1998
                                                 -------------       -------------
<S>                                              <C>                 <C>          
Inventories:
    Customer service parts                       $      31,387       $      31,671
    Raw materials                                       36,829              49,630
    Work-in-process                                     71,998              79,238
    Demonstration equipment                             20,580              47,234
    Finished goods                                      13,840              26,792
                                                 -------------       -------------
                                                 $     174,634       $     234,565
                                                 =============       =============
Property and equipment:
    Land                                         $      10,502       $      10,687
    Buildings and improvements                          11,053              11,169
    Machinery and equipment                            129,869             158,317
    Office furniture and fixtures                       17,849              22,280
    Leasehold improvements                              38,805              54,440
                                                 -------------       -------------
                                                       208,078             256,893
    Less: accumulated depreciation
       and amortization                                (90,483)           (115,956)
                                                 -------------       -------------
                                                 $     117,595       $     140,937
                                                 =============       =============

Other current liabilities:
    Warranty, installation and retrofit          $      50,569       $      60,008
    Compensation and benefits                           76,955             101,975
    Income taxes payable                                62,784              57,660
    Other accrued expenses                              72,118              63,205
                                                 -------------       -------------
                                                 $     262,426       $     282,848
                                                 =============       =============
</TABLE>


NOTE  3  - NON-RECURRING ACQUISITION, RESTRUCTURING AND OTHER CHARGES


                                       14


<PAGE>   15
During fiscal 1998, the Company acquired all of the outstanding stock of Nanopro
GmbH, VARS Inc. and Device Ware for an aggregate amount of approximately $21
million in cash. These companies specialize in various aspects of advanced wafer
inspection tools and related software. These acquisitions were accounted for
using the purchase method of accounting. The purchase price was allocated to the
acquired assets and liabilities which primarily consisted of in-process
technology. Excluding the aggregate $21 million write-offs of acquired
in-process technology, the aggregate impact of these acquisitions were not
material to the Company's consolidated statements of operations in the current
fiscal year.

In April 1998, the Company completed its acquisition of Amray, Inc. (Amray), a
privately owned provider of scanning electron microscope systems, using the
pooling of interests method of accounting. The Company acquired all of the
outstanding capital stock of Amray in exchange shares of its common stock. In
addition, the Company incurred $2 million in professional fees and restructuring
charges related to this acquisition. Amray's historical operations, net assets,
and cash flows are not material to the Company's consolidated financial results
and, therefore, were not reflected in the Company's consolidated financial
results prior to the acquisition.

During fiscal 1997, the Company recorded charges totaling $61 million for
merger, restructuring and other non-recurring events. Of this amount
approximately $46 million was the result of the merger between KLA Instruments
and Tencor Instruments on April 30, 1997, $6 million was a result of the
write-off of a Tencor bad debt and additional restructuring charges of $9
million primarily related to lease exit costs incurred by Tencor Instruments
prior to the merger. During fiscal 1998, approximately $17 million of the
accrued balance was used and $5 million of the accrued balance remains and is
expected to be utilized ratably during the first half of fiscal 1999.

NOTE 4 - INVESTMENTS

The amortized cost and estimated fair value of securities available for sale as
of June 30, 1997 and 1998, are as follows (in thousands):


<TABLE>
<CAPTION>
                                             Gross              Gross            Gross            Estimated
                                           Amortized         Unrealized        Unrealized            Fair
                                              Cost              Gains            Losses             Value
                                          -------------     -------------     -------------     -------------
<S>                                       <C>               <C>               <C>               <C>          
June 30, 1997

U.S. Treasuries                           $      70,777     $         236     $         373     $      70,640
Municipal bonds                                 273,391             1,010               494           273,907
Corporate debt securities                        26,120                63               228            25,955
Other                                           245,178            28,111                26           273,263
                                          -------------     -------------     -------------     -------------
                                          $     615,466     $      29,420     $       1,121     $     643,765

Less: cash equivalents                          235,622               135                16           235,741
          short-term investments                 42,159            28,517             1,070            69,606
                                          -------------     -------------     -------------     -------------
Long-term investments                     $     337,685     $         768     $          35     $     338,418
                                          =============     =============     =============     =============

June 30, 1998

U.S. Treasuries                           $      22,849     $         102     $          21     $      22,930
Mortgage backed securities                       39,951               567                76            40,442
Municipal bonds                                 414,760             3,649               140           418,269
Corporate debt securities                        63,439               155                53            63,541
Corporate equity securities                      10,895            38,292                --            49,187
Other                                            84,727               139               233            84,633
                                          -------------     -------------     -------------     -------------

</TABLE>


                                       15


<PAGE>   16

<TABLE>
<CAPTION>
                                             Gross              Gross            Gross            Estimated
                                           Amortized         Unrealized        Unrealized            Fair
                                              Cost              Gains            Losses             Value
                                          -------------     -------------     -------------     -------------
<S>                                       <C>               <C>               <C>               <C>          
Other                                            84,727               139               233            84,633
                                          -------------     -------------     -------------     -------------
                                          $     636,621     $      42,904     $         523     $     679,002

Less: cash equivalents                          171,466                43                18           171,491
      short-term investments                     73,260            19,406               323            92,343
                                          -------------     -------------     -------------     -------------
Long-term investments                     $     391,895     $      23,455     $         182     $     415,168
                                          =============     =============     =============     =============
</TABLE>


The contractual maturities of securities classified as available for sale as of
June 30, 1998, regardless of the consolidated balance sheet classification, are
as follows (in thousands):


<TABLE>
<CAPTION>
                                                Estimated
                                                Fair Value
                                               -------------
<S>                                            <C>          
Due within one year                            $     180,966
Due after one year through five years                229,034
Due after five years                                 219,815
                                               -------------
                                               $     629,815
                                               =============
</TABLE>

Actual maturities may differ from contractual maturities because borrowers may
have the right to call or prepay obligations with or without call or prepayment
penalties. The realized gains and losses for the year ended June 30, 1998 and
1997, were not material to the Company's financial position or results of
operations.

NOTE 5 - INCOME TAXES


<TABLE>
<CAPTION>
Year ended June 30, (in thousands)                    1996                1997                1998
                                                 -------------       -------------       -------------
<S>                                              <C>                 <C>                 <C>          
The components of income before 
income taxes are as follows:

    Domestic income before income taxes          $     290,199       $     152,778       $     172,964
    Foreign income before income taxes                  23,901              21,201              33,347
                                                 -------------       -------------       -------------
                                                 $     314,100       $     173,979       $     206,311
                                                 =============       =============       =============

The provision (benefit) for income taxes are 
comprised of the following:
    Current:
       Federal                                   $     109,420       $      66,439       $      94,402
       State                                            18,193              10,603              13,598
       Foreign                                           9,557               8,808              10,440
                                                 -------------       -------------       -------------
                                                       137,170              85,850             118,440
    Deferred:
       Federal                                         (19,162)            (15,238)            (42,149)
       State                                            (1,787)             (1,766)             (4,376)
       Foreign                                           1,245                (263)                300
                                                 -------------       -------------       -------------
                                                       (19,704)            (17,267)            (46,225)
                                                 -------------       -------------       -------------
    Provision for income taxes                   $     117,466       $      68,583       $      72,215
                                                 =============       =============       =============
</TABLE>


Actual current tax liabilities are lower than reflected above for fiscal years
1996, 1997 and 1998 by $10, $10 and $20 million, respectively, due to the stock
option deduction benefits recorded as credits to capital in excess of par value.

The significant components of deferred income tax assets (liabilities) are as
follows:

Deferred tax assets:


                                       16


<PAGE>   17

<TABLE>
<S>                                                          <C>                 <C>          
    Federal and state loss and credit carryforwards          $       2,820       $       1,633
    State tax                                                          597              26,606
    Nondeductible reserves and other                                73,767              98,218
                                                             -------------       -------------
                                                                    77,184             126,457
                                                             -------------       -------------

Deferred tax liabilities:
    Depreciation                                                    (4,105)             (4,625)
    Unremitted earnings of foreign subsidiaries not
       permanently reinvested                                      (11,239)            (11,501)
    Unrealized (gain) loss on investments                          (11,036)            (15,330)
    Other                                                           (2,713)             (6,951)
                                                             -------------       -------------
                                                                   (29,093)            (38,407)
                                                             -------------       -------------

Deferred tax assets valuation allowance                             (4,576)             (1,633)
                                                             -------------       -------------

Total net deferred tax assets                                $      43,515       $      86,417
                                                             =============       =============
</TABLE>


The reconciliation of the United States federal statutory income tax rate to the
Company's effective income tax rate is as follows:


<TABLE>
<S>                                                               <C>             <C>             <C>  
    Federal statutory rate                                          35.0%           35.0%           35.0%
    State income taxes, net of federal benefit                       3.5             3.3             2.9
    Effect of foreign operations taxed at various rates              0.4             0.7             0.0
    Benefit from foreign sales corporation                          (2.9)           (3.3)           (2.8)
    Realized deferred tax assets previously reserved                (0.4)           --              (1.4)
    Merger costs                                                      --             4.5             3.0
    Other                                                            1.7            (0.8)           (1.7)
                                                                    ----            ----            ----
                                                                    37.3%           39.4%           35.0%
                                                                    ====            ====            ====
</TABLE>


Undistributed earnings of certain of the Company's foreign subsidiaries, for
which no U.S. federal income taxes have been provided, aggregated approximately
$13 million at June 30,1998. The amount of the unrecognized deferred tax expense
related to the investments in foreign subsidiaries is estimated at approximately
$5 million at June 30,1998.

The IRS is currently auditing the Company's federal income tax returns for
fiscal 1995 to 1996. Management believes sufficient taxes have been provided in
prior years and that the ultimate outcome of the IRS audits will not have a
material adverse impact on the Company's financial position or results of
operations.

NOTE 6 - STOCKHOLDERS' EQUITY AND EMPLOYEE BENEFITS

In March 1989, the Company implemented a plan to protect stockholders' rights in
the event of a proposed takeover of the Company. The Plan provides that if any
person or group acquires 15% or more of the Company's Common Stock, each Right
not owned by such person or group will entitle its holder to purchase, at the
then-current exercise price, the Company's Common Stock at a value of twice that
exercise price. The rights are redeemable by the Company and expire in April
2006.

STOCK OPTION AND INCENTIVE PLANS. The Company has various stock option and
management incentive plans for selected employees, officers, directors, and
consultants. The plans provide for awards in the form of stock options, stock
appreciation rights, stock purchase rights, and performance shares. As of June
30, 1998, only stock options have been awarded under the plans.


                                       17


<PAGE>   18
In calendar 1996, the Company granted employees the right to re-price certain
stock options issued to employees during the period August 1994 through August
1996. The re-pricing was done in the form of an exchange, whereby eligible
optionees could cancel their current options in exchange for new options with
exercise prices at the fair market value on the date of grant.

The activity under the option plans, combined, was as follows:


<TABLE>
<CAPTION>
                                                                                  Weighted-
                                      Available              Options               Average
                                      For Grant            Outstanding          Exercise Price
                                      ---------            -----------          --------------
<S>                                  <C>                   <C>                  <C>  
Balances at June 30, 1995             2,738,614             7,737,430               11.82
Additional shares reserved            3,700,000                    --                  --
Options granted                      (3,283,370)            3,283,370               30.62
Options canceled/expired              1,240,116            (1,253,098)              32.03
Options exercised                            --              (906,797)               5.40
                                      ---------            ----------               -----

Balances at June 30, 1996             4,395,360             8,860,905               16.70
Additional shares reserved            1,600,000                    --                  --
Options granted                      (4,479,879)            4,479,879               30.15
Options canceled/expired                610,357            (1,992,129)              31.22
Options exercised                            --            (1,087,689)               8.20
                                      ---------            ----------               -----

Balances at June 30, 1997             2,125,838            10,260,966           $   20.65
Additional shares reserved            2,501,603                    --                  --
Options granted                      (3,629,888)            3,629,888               46.44
Options canceled/expired                751,710              (915,914)              30.56
Options exercised                            --            (1,380,175)              10.33
                                      ---------            ----------               -----

Balances at June 30, 1998             1,749,263            11,594,765               29.11
                                      =========            ==========               =====
</TABLE>

The options outstanding at June 30, 1998, have been segregated into ranges for
additional disclosure as follows:


<TABLE>
<CAPTION>
                                         Options Outstanding                   Options Vested and Exercisable
                           ------------------------------------------------  ------------------------------------
                              Number       Weighted-Average    Weighted-      Number Vested
    Range of               Outstanding         Remaining        Average      and Exercisable     Weighted-Average
Exercise Prices            at 06/30/98     Contractual Life  Exercise Price    at 06/30/98       Exercise Price
- ---------------            -----------   ------------------  --------------  ---------------     ----------------
<S>                        <C>           <C>                 <C>             <C>                 <C>      
$ 1.48 - $18.13              2,648,431                5.58     $   10.33       2,520,700           $   10.09
$18.14 - $21.88              3,441,548                7.26         19.99       1,546,289               19.32
$21.89 - $40.81              1,494,828                8.63         35.32         286,795               31.55
$40.82 - $40.94              1,749,010                9.33         40.94             500               40.88
$40.95 - $54.75              1,369,056                8.83         46.10         386,214               44.46
$54.76 - $69.89                891,892                9.09         60.58         371,414               60.56
- ---------------             ----------                ----     ---------       ---------           ---------
$ 1.48 - $69.89             11,594,765                7.69     $   29.11       5,111,912           $   20.35
===============             ==========                ====    ==========       =========           =========
</TABLE>


The weighted average fair value of options granted in 1998, 1997 and 1996 is
$26.36, $14.61 and $14.56, respectively. Options exercisable were 5,111,912,
4,592,963, and 4,425,065 as of June 30, 1998, 1997 and 1996, respectively.

EMPLOYEE STOCK PURCHASE PLAN. The Company's employee stock purchase plan
provides that eligible employees may contribute up to 10% of their base earnings
toward the semi-annual purchase of the Company's Common Stock. The employee's
purchase price is derived from a formula based on the fair market value of the
Common Stock. No compensation expense is recorded in connection with the plan.
In 1998, 1997 and 1996, 882,869, 925,311 and 697,203 shares, respectively, had
been purchased by employees. At June 30, 1998, 819,306 shares were reserved and
available for 


                                       18


<PAGE>   19
issuance under this plan. The weighted average fair value of shares issued in
1998, 1997 and 1996 is $11.20, $7.67, and $8.07, respectively.

PRO FORMA NET INCOME AND EARNINGS PER SHARE. Pro forma information regarding net
income and net income per share is required by SFAS 123, and has been determined
as if the Company had accounted for its employee stock purchase plan and
employee stock options granted subsequent to June 30, 1995, under the fair value
method of SFAS 123. The fair value of each option grant is estimated on the date
of grant using the Black-Scholes option pricing model for the single option
approach with the following weighted-average assumptions:


<TABLE>
<CAPTION>
                                                   1996             1997             1998
                                                   ----             ----             ----
<S>                                               <C>              <C>              <C>  
Stock option plan:
     Expected stock price volatility               50.0%            50.0%            55.0%
     Risk free interest rate                        6.4%             6.2%             5.8%
     Expected life of options (years)               5.4              5.4              5.6

Stock purchase plan:
     Expected stock price volatility               50.0%            50.0%            55.0%
     Risk free interest rate                        5.7%             5.6%             5.4%
     Expected life of options (years)               1-2              1-2              1-2
</TABLE>


The Black-Scholes option valuation model was developed for use in estimating the
fair value of traded options which have no vesting restrictions and are fully
transferable. In addition, option valuation models require the input of highly
subjective assumptions including the expected stock price volatility. Because
the Company's employee stock options and employee stock purchase plan have
characteristics significantly different from those of traded options, and
because changes in the subjective input assumptions can materially affect the
fair value estimate, in management's opinion, the existing models do not
necessarily provide a reliable single measure of the fair value of such Company
options.

For purposes of pro forma disclosures required by SFAS 123, the estimated fair
value of the options is amortized to expense over the options' vesting periods.
The Company's pro forma information follows for the years ended June 30, 1996,
1997, 1998 follows (in thousands except for earnings per share information):


<TABLE>
<CAPTION>
                                             1996                1997                 1998
                                        -------------        -------------        -------------
<S>                                     <C>                  <C>                  <C>          
Net income:
     Historical                         $     196,634        $     105,396        $     134,096
     Proforma                           $     189,331        $      89,608        $     106,882

Historical earnings per share:
     Basic                              $        2.42        $        1.29        $        1.58
     Diluted                            $        2.34        $        1.24        $        1.52

Proforma earnings per share:
     Basic                              $        2.33        $        1.09        $        1.26
     Diluted                            $        2.27        $        1.07        $        1.24
</TABLE>


The pro forma effect on net income and earnings per share for fiscal 1998 and
fiscal 1997 is not representative of the pro forma effect net income in future
years because it does not take into consideration pro forma compensation expense
related to grants made prior to fiscal 1996.


                                       19


<PAGE>   20
OTHER EMPLOYEE BENEFIT PLANS. The Company has a profit sharing program for
eligible employees which distributes, on a quarterly basis, a percentage of
pretax profits. In addition, the Company has an employee savings plan that
qualifies as a deferred salary arrangement under Section 401(k) of the Internal
Revenue Code. During 1998, the Company matched dollar-for-dollar up to $1,000 of
an eligible employee's contribution. The total charge to operations under the
profit sharing and 401(k) programs aggregated approximately $22 million, $24
million and $32 million in 1998, 1997 and 1996, respectively.

The Company has a non-qualified deferred compensation plan whereby certain key
executives may defer a portion of their salary and bonus. Participants direct
the investment of their account balances among mutual funds selected by the
participants. Distributions from the plan commence following a participant's
retirement or termination of employment. At June 30, 1998, the Company had a
deferred compensation liability under the plan of $26 million.

NOTE 7 - COMMITMENTS AND CONTINGENCIES

The Company has an agreement with a bank to sell, with recourse, certain of its
trade receivables. The total amount of the facility is the yen equivalent of
approximately $80 million based upon exchange rates as of June 30, 1998. The
Company has accounted for the sale of certain of these receivables as an off
balance sheet financing arrangement. During fiscal 1998, approximately $166
million of receivables were sold under this arrangement. As of June 30, 1998,
$52 million remains uncollected. The Company does not believe it is materially
at risk for any losses as a result of this agreement.

The Company has entered into a master operating lease for land, office and
manufacturing facilities constructed for its use in Milpitas and San Jose,
California. Monthly rent payments under these leases vary based upon the London
Interbank Offering Rate (LIBOR). At the end of the lease the Company, at its
option, can acquire the properties at their original cost or arrange for the
properties to be acquired. If the Company does not purchase the properties at
the end of the lease, the Company will be contingently liable to the lessor for
residual value guarantees aggregating $132 million. In addition, under the terms
of the lease, the Company must maintain compliance with certain financial
covenants. As of June 30, 1998, the Company was in compliance with all of its
covenants. Management believes that the contingent liability relating to the
residual value guarantees does not currently have a material adverse effect on
the Company's financial position or results of operations.

The Company leases several other facilities under operating leases that expire
at various times through fiscal 2012, with renewal options at the fair market
value for additional periods up to five years. The Company also leases equipment
and other facilities under operating leases.

Total rent expense under all operating leases was $18 million, $15 million and
$10 million for the years ended June 30, 1998, 1997 and 1996, respectively.

Future minimum lease commitments under these operating leases at June 30, 1998
(which include estimated lease payments for the Company's Milpitas and San Jose,
California, facilities using a LIBOR of approximately 6.0% and total
construction costs of $132 million), are $19 million, $16 million, $14 million,
$13 million, $6 million, and $11 million in fiscal 1999 through 2003 and
thereafter, respectively.

NOTE 8 - INDUSTRY AND GEOGRAPHIC INFORMATION

No single customer accounted for more than 10% of net revenues in 1998, 1997 and
1996. International sales accounted for 56%, 65% and 66% of the Company's
revenues in 1998, 1997 and 1996, respectively.


                                       20


<PAGE>   21
The following is a summary of the Company's geographic operations:


<TABLE>
<CAPTION>
Year ended June 30, (in thousands)                                   1996                  1997                  1998
                                                                 -----------           -----------           -----------
<S>                                                              <C>                   <C>                   <C>        
Sales to unaffiliated customers:
        United States                                            $   375,639           $   364,162           $   513,065
        Western Europe                                               143,816               137,314               147,070
        Japan                                                        352,080               257,382               291,175
        Asia Pacific                                                 222,957               272,966               215,015
                                                                 -----------           -----------           -----------
                  Total sales to unaffiliated customers            1,094,492             1,031,824             1,166,325

Intercompany sales among geographic areas:
        United States                                                 90,561                 5,548                43,993
        Western Europe                                                54,059                85,075                10,843
        Japan                                                         81,494               124,998               229,102
        Asia Pacific                                                  18,627                 6,337                10,706
        Consolidation eliminations                                  (244,741)             (221,958)             (294,644)
                                                                 -----------           -----------           -----------
                  Revenues                                       $ 1,094,492           $ 1,031,824           $ 1,166,325
                                                                 ===========           ===========           ===========

Operating results:
        United States                                            $    75,597           $    40,802           $    90,655
        Western Europe                                                54,436                39,344                25,079
        Japan                                                        124,100                68,835                51,187
        Asia Pacific                                                  67,085                62,685                38,648
                                                                     321,218               211,666               205,569
        General corporate expenses                                   (24,952)              (65,834)              (40,938)
                                                                 -----------           -----------           -----------
                  Income from operations                         $   296,266           $   145,832           $   164,631
                                                                 ===========           ===========           ===========

Identifiable assets:
        United States                                            $   423,560           $   822,067           $   657,147
        Western Europe                                                51,045                49,417                97,336
        Japan                                                        124,839               100,311               126,764
        Asia Pacific                                                  81,724                22,680                38,180
        General corporate assets                                     476,751               348,832               628,970
                                                                 -----------           -----------           -----------
                  Total assets                                   $ 1,157,919           $ 1,343,307           $ 1,548,397
                                                                 ===========           ===========           ===========
</TABLE>


Intercompany sales among the Company's geographic areas are recorded on the
basis of intercompany prices established by the Company.

At June 30, 1998, 1997 and 1996, total foreign liabilities (excluding
intercompany balances) were $71 million, $85 million and $76 million,
respectively. For fiscal years 1998, 1997 and 1996, foreign capital expenditures
and depreciation expense were $14 million, $4 million and $7 million and $5
million, $2 million and $1 million, respectively.

NOTE 9 - QUARTERLY CONSOLIDATED RESULTS OF OPERATIONS (UNAUDITED)


<TABLE>
<CAPTION>
In thousands, 
except per share amounts    September 30   December 31  March 31       June 30
                            ------------   -----------  --------       --------
<S>                         <C>            <C>          <C>            <C>
1998:
Revenues                      $312,420      $326,361    $274,164       $253,380
Gross profit                   171,656       176,126     139,940        123,686
Income from operations          64,341        67,224      30,708 (1)      2,358 (2)
</TABLE>


                                       21


<PAGE>   22
<TABLE>
<CAPTION>
In thousands, 
except per share amounts    September 30   December 31  March 31       June 30
                            ------------   -----------  --------       --------
<S>                         <C>            <C>          <C>            <C>
Net Income                      49,722        52,058      28,971 (1)      3,345 (2)
Net Income per share:
    Basic                     $   0.59      $   0.61    $   0.34 (1)   $   0.04 (2)
    Diluted                   $   0.56      $   0.59    $   0.33 (1)   $   0.04 (2)

1997:
Revenues                      $261,140      $242,155    $252,346       $276,183
Gross profit                   145,776       127,281     135,241        151,616
Income from operations          46,165 (3)    47,750      49,000          2,917 (4)
Net Income                      33,580 (3)    34,219      36,995            602 (4)
Net Income per share:
    Basic                     $   0.41 (3)  $   0.42   $    0.45      $    0.01 (4)
    Diluted                   $   0.40 (3)  $   0.40        0.43      $    0.01 (4)
</TABLE>


(1)     Includes non-recurring acquisition and restructuring charges of $3
        million. Net income, basic and diluted net income per share would have
        been $31 million, $0.37 and $0.35, respectively, excluding these costs.

(2)     Includes non-recurring acquisition and restructuring charges of $19
        million. Net income, basic and diluted net income per share would have
        been $23 million, $0.26 and $0.26, respectively, excluding these costs.

(3)     Includes restructuring costs of $9 million. Net income, basic and
        diluted net income per share would have been $39 million, $0.47 and
        $0.46, respectively, excluding these costs.

(4)     Includes merger, restructuring and other costs of $52 million. Net
        income, basic and diluted net income per share would have been $42
        million, $0.50 and $0.48, respectively, excluding these costs.


                                       22


<PAGE>   23
QUARTERLY COMMON STOCK MARKET PRICE:


<TABLE>
<CAPTION>
1998 Quarter ended         September 30          December 31         March 31           June 30
- ------------------         ------------          -----------         --------           -------
<S>                        <C>                   <C>                 <C>                <C>
High                          76 7/8               74                 48                43 1/4
Low                           48 1/4               33 1/2             33 3/8            24 1/4
</TABLE>


<TABLE>
<CAPTION>
1997 Quarter ended         September 30          December 31         March 31            June 30
- ------------------         ------------          -----------         --------           -------
<S>                        <C>                   <C>                 <C>                <C>
High                          24 3/4               40                 49 3/4             53 1/8
Low                           14 3/4               17 5/8             25 1/2             35 1/2
</TABLE>


The preceding table sets forth the high and low prices of the Company's Common
Stock as traded on the Nasdaq National Market System during the last two years.
As of September 1, 1998, there were approximately 2,103 shareholders of record
of the Company's Common Stock. The price for the Company's Common Stock as of
the close of business on September 1, 1998 was $25.38 per share. The Company has
never paid cash dividends to its stockholders. The Company does not plan to pay
cash dividends in the foreseeable future.


                                       23


<PAGE>   24
REPORT OF INDEPENDENT ACCOUNTANTS

To the Board of Directors and Stockholders of KLA-Tencor Corporation

In our opinion, the accompanying consolidated balance sheets and the related
consolidated statements of income, of stockholders' equity and of cash flows
present fairly, in all material respects, the financial position of KLA-Tencor
Corporation and its subsidiaries at June 30, 1998 and 1997, and the results of
their operations and their cash flows for each of the three years in the period
ended June 30, 1998, in conformity with generally accepted accounting
principles. These financial statements are the responsibility of the Company's
management; our responsibility is to express an opinion on these financial
statements based on our audits. We conducted our audits of these statements in
accordance with generally accepted auditing standards which require that we plan
and perform the audit to obtain reasonable assurance about whether the financial
statements are free of material misstatement. An audit includes examining, on a
test basis, evidence supporting the amounts and disclosures in the financial
statements, assessing the accounting principles used and significant estimates
made by management, and evaluating the overall financial statement presentation.
We believe that our audits provide a reasonable basis for the opinion expressed
above.

PRICEWATERHOUSECOOPERS  LLP

San Jose, California
July 28, 1998


                                       24



<PAGE>   1
                                                                    EXHIBIT 21.1

                             KLA-TENCOR SUBSIDIARIES


<TABLE>
<CAPTION>
                                                     State or Other Jurisdiction of
NAME                                                 Incorporation
- ----                                                 -------------
<S>                                                  <C>
DOMESTIC SUBSIDIARIES
International Sales & Business, Inc.                 California
KLA-Tencor Building Corporation                      California
KLA-Tencor Disc Corporation                          California
KLA-Tencor International Corporation                 California
KLA-Tencor Klinnik Corporation                       California
KLA-Tencor Management Corporation                    California
KLA-Tencor (Thailand Branch) Corporation             California
VLSI Standards, Inc.                                 California
Amray, Inc.                                          Delaware
Groff Associates, Inc.                               California
DeviceWare, Inc.                                     California

INTERNATIONAL SUBSIDIARIES
KLA-Tencor (Cayman) Limited I                        Cayman Islands
KLA-Tencor (Cayman) Limited II                       Cayman Islands
KLA-Tencor (Cayman) Limited III                      Cayman Islands
KLA-Tencor (Israel) Corporation                      Israel
KLA-Tencor Holding Corporation 1987 Limited          Israel
KLA-Tencor Corporation 1992 Limited                  Israel
KLA-Tencor Italy S.R.L.                              Italy
KLA-Tencor Japan, Ltd.                               Japan
KLA-Tencor Sales Corporation                         U.S. Virgin Islands
KLA-Tencor GmbH                                      Germany

KLA-Tencor France SARL                               France
KLA-Tencor Korea, Inc.                               Korea
KLA-Tencor Limited                                   United Kingdom
KLA-Tencor (Malaysia) Sdn Bhd                        Malaysia
KLA-Tencor (Singapore) PTE, Ltd.                     Singapore
Tencor Instruments (Service) Limited                 United Kingdom
VLSI Standards, KK                                   Japan
</TABLE>



<PAGE>   1
                                                                    EXHIBIT 23.1

                       Consent of Independent Accountants

We hereby consent to the incorporation by reference in the Registration
Statements on Form S-8 (No. 33-15784, No. 2-71584, No. 2-75314, No. 33-26002,
No. 33-42973, No. 33-42982, No. 33-42975, No. 33-55362, No. 33-88662, No.
333-03003, No. 333-22939, No. 333-22941, No. 333-26681, No. 333-32537, No.
333-45271, No. 333-60887, and No. 333-60883) and in the Prospectus constituting
part of the Registration Statement on Form S-3 (No. 333-52393) of KLA-Tencor
Corporation of our report dated July 28, 1998 appearing on page 34 of the Annual
Report to Stockholders, which is incorporated in this Annual Report on Form
10-K.


PricewaterhouseCoopers LLP
San Jose, California
September 28, 1998




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