PLEXUS CORP
10-K405, 1999-12-22
PRINTED CIRCUIT BOARDS
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<PAGE>   1



                                 UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                   FORM 10-K

  X           ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE
- -----                   SECURITIES EXCHANGE ACT OF 1934

                  FOR THE FISCAL YEAR ENDED SEPTEMBER 30, 1999

                                       OR

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


                        Commission file number 000-14824

                                  PLEXUS CORP.
             (Exact name of registrant as specified in its charter)

<TABLE>
<S>                                                                             <C>
         WISCONSIN                                                                        39-1344447
(State or other jurisdiction of incorporation or organization)                  (I.R.S. Employer Identification No.)

55 JEWELERS PARK DRIVE, NEENAH, WISCONSIN                                                54957-0156
(Address of principal executive offices)                                                 (Zip Code)
</TABLE>

Registrant's telephone number, including area code: (920) 722-3451

Securities registered pursuant to Section 12(b) of the Act: None

Securities registered pursuant to Section 12(g) of the Act: Common Stock, $.01
                                                            par value
                                                            Preferred 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(s)) 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 the 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. [X]

As of December 15, 1999, 17,637,644 shares of Common Stock were outstanding,
and the aggregate market value of the shares of Common Stock (based upon the
$41.125 closing sale price on that date, as reported on the NASDAQ National
Market System) held by non-affiliates (excludes shares reported as beneficially
owned by directors and officers - does not constitute an admission as to
affiliate status) was approximately $691 million.

                      DOCUMENTS INCORPORATED BY REFERENCE

                                           Part of Form 10-K Into Which
           Document                        Portions of Document are Incorporated
  Proxy Statement for 1999 Annual
  Meeting of Shareholders                  Part III


<PAGE>   2



"SAFE HARBOR" CAUTIONARY STATEMENT UNDER THE PRIVATE SECURITIES LITIGATION
REFORM ACT OF 1995:

         The statements contained in the Form 10-K which are not historical
facts (such as statements in the future tense and statements including
"believe", "expect", "intend", "plan", "look forward to", "anticipate" and
similar terms) are forward-looking statements that involve risks and
uncertainties, including, but not limited to, the level of overall growth in
the electronics industry, the Company's ability to integrate acquired
operations, the Company's ability to secure new customers and maintain its
current customer base, the result of cost reduction efforts, material cost
fluctuations and the adequate availability of components and related parts for
production, the risk of customer delays or cancellations in both on-going and
new programs, the timing and mix of production, the effect of start-up costs of
new programs and facilities, capacity utilization, the effect of economic
conditions, the impact of technological changes and increased competition,
design and manufacturing deficiencies and other risks detailed herein and in
the Company's other Securities and Exchange Commissions filings. In addition,
see the Management's Discussion and Analysis of Financial Condition and Results
of Operations in Item 7, particularly "General" and "Year 2000" for a further
discussion of factors which could effect future results.

                                     PART I

ITEM 1. BUSINESS

General Development of the Company

         Plexus Corp., through its subsidiaries (together "Plexus" or the
"Company"), provides product realization services to original equipment
manufacturers ("OEMs") in the medical, computer (primarily mainframes, servers
and peripherals), industrial, networking, telecommunications and transportation
electronics industries. Plexus offers a full range of services including
product development and design, material procurement and management,
prototyping, manufacturing and assembly, functional and in-circuit testing,
final system box build, distribution and after-market support.

         The contract manufacturing services are provided on either a turnkey
basis, where the Company procures certain or all of the materials required for
product assembly, or on a consignment basis, where the customer supplies
materials necessary for product assembly. Turnkey services include material
procurement and warehousing, in addition to manufacturing, and involve greater
resource investment than consignment services. Other than test equipment
products, the Company does not design or manufacture its own proprietary
products.

         Plexus is a Wisconsin corporation incorporated in 1979. Its principle
subsidiaries are Plexus Electronic Assembly Corporation, Plexus Technology
Group, Inc. and SeaMED Corporation. The Company's principle office is located
at 55 Jewelers Park Drive, Neenah, Wisconsin 54957-0156, and its telephone
number is (920) 722-3451.

         Acquisitions. In July 1999, the Company acquired SeaMED Corporation
(SeaMED), located in the Seattle, Washington area. Pursuant to the merger
agreement, SeaMED stockholders received approximately 2.27 million shares of
Plexus common stock in exchange for all outstanding shares of SeaMED. All
financial data has been prepared following the pooling of interests method of
accounting and as such all historical data has been restated. SeaMED provides
design and manufacturing services focused primarily on established and emerging
medical technology companies. Additionally, SeaMED can provide these services
to non-medical companies. SeaMED provides expertise in its medical engineering
and regulatory knowledge and its complex higher-level assembly capabilities.

         In September 1999, the Company purchased certain printed circuit board
assembly manufacturing assets, located in the Chicago, Illinois area, from
Shure Incorporated, an unrelated party. The manufacturing assets, consisting
principally of inventories and equipment, were purchased at approximately fair
market value for cash.

         For further information regarding the Company's fiscal 1999 merger and
acquisition activity, see Notes 1 and 8 in the Notes to Consolidated Financial
Statements.

Product Realization Services

         General Background. The Company's services involve product design,
testing, prototyping, materials management, assembly of complete electronic
products and subassemblies, and after market service support of products. In
addition to its general capabilities to develop electronic products for the
broad electronic market, the Company has specific competencies focused on the
medical, networking, telecommunications and wireless product markets.



                                       1
<PAGE>   3

         The various types of electronic product services offered by the
Company are discussed below. A customer of the Company may utilize any or all
of these services. The Company charges for these services under a variety of
pricing methods that vary according to the customer or type of service
involved.

         Product Design and Test Services. The Company, primarily through its
Plexus Technology Group, Inc. and SeaMED Corporation subsidiaries, provides
product design and test engineering services. These services include project
management, initial feasibility studies, product concept definition,
development of specifications for product features and functions, product
engineering specifications, microprocessor design, circuit design, software
design, custom integrated circuit design, printed circuit board layout, product
housing design, development of test specification, product validation test
development and manufacturing test systems. The Company's design services
provide customers with a complete product design which is capable of performing
an intended function and which can be manufactured in an efficient and
economical manner.

         The Company's technologies involve the use of computer assisted
electronic design automation tools to shorten the design cycle and improve
design quality. The Company's personnel use a variety of these advanced design
automation tools in the development of electronic products. Custom integrated
circuit design is assisted by circuit synthesis and simulation tools. Software
design is assisted by structured design tools and microprocessor emulation
technologies. Automated component placement and signal routing tools assist
printed circuit board design of complex multi-layered circuit boards. Solids
modeling and structure analysis tools assist product housing design.

         The Company believes that its product development engineering and
testing capabilities are significant factors in the success of its business.
The Company maintains a staff of more than 400 employees in its engineering
services operations, including more than 350 engineers and technologists
involved in project management, hardware, software, mechanical, printed circuit
board design, test, prototyping and validation of electronic products and
systems. The Company believes this comprehensive capability provides
significant value to its customers by providing one-stop-shopping for product
design, prototyping, test and manufacturing. The Company believes this
comprehensive service lowers the overall development cost to the customer and
accelerates the time-to-market of the customers' products.

         To supplement its internal capabilities, Plexus has formed several
strategic alliances with independent research and development organizations for
cooperative design and marketing programs. The Company believes these alliances
provide complementary technologies and expertise to customers.

         Prototyping Services. The Company provides rapid assembly of prototype
products within dedicated assembly facilities. The prototype assembly service
is supplemented by value-added services including materials management,
manufacturing defects analysis, design for manufacturability analysis, design
for testability analysis, and printed circuit board design. This service
provides a bridge between the Company's engineering organization, the
customer's engineering organization, and the Company's manufacturing
organization. This bridge facilitates efficient transitions into manufacturing.
The Company believes the higher-level engineering services offered by the
prototyping organization provide significant value to its customers by
accelerating time-to-production.

         Product Manufacture and Assembly. The Company, primarily through its
Plexus Electronic Assembly Corporation and SeaMED Corporation subsidiaries,
manufactures electronic products and assemblies for use in a wide variety of
industries and applications.

         The Company's manufacturing services consist primarily of electronic
components assembled on printed circuit boards and programmed to perform
specific functions. Additionally, the assembly may include the incorporation of
the electronic assemblies into a subassembly or the final product housing. The
Company's assembly processes involve the fabrication of products from
components manufactured to specification by others. Printed circuit boards are
the basic element in the manufacture of most electronic products and act as the
interconnection platforms for various integrated circuits and electronic
components. The electronic components include computer memory chips,
microprocessors, integrated circuits, resistors, capacitors, transformers and
switches. The Company believes these products would be available from a variety
of sources and that the loss of any single source of supply would not
materially affect the Company's business. In addition to the Company's ability
to design and manufacture complete electronic products, the Company also has
the capacity of designing and assembling printed circuitry products and
products utilizing circuit boards with multiple layers of circuitry.

         The Company's manufacturing operations include printed circuit board
assembly, testing, and final systems box build into the final product housing.
While the Company has automated various aspects of many processes, the assembly
of components into electronic products still requires some labor-intensive
processes generally requiring a high degree of precision and dexterity in the
assembly stage and integration of quality assurance checks into the
manufacturing processes. The final systems box build process is a



                                       2
<PAGE>   4

mostly manual process with little opportunity for automation. The Company
utilizes specially designed equipment and techniques to maintain its ability to
assemble efficiently a wide variety of electronic products. Additionally, the
Company has developed special processes and tools to enable the assembly of
finished medical devices to meet the US Food and Drug Administration (FDA)
Quality System Regulation (QSR) requirements. One of the Company's Neenah,
Wisconsin operations, and its Seattle, Washington operations (formerly SeaMED),
are registered with the FDA as medical device manufacturers and are subject to
regularly scheduled and unscheduled FDA audits.

         The Company also provides service support for manufactured products.
Products, which may or may not be under the customer's warranty, can be
returned for repairs and/or upgrades at the customer's discretion.

         Product Testing. The increasingly complex design and assembly
techniques for production of electronic products have created a need for the
Company's services in designing and assembling test equipment for electronic
assemblies. Such test equipment includes functional test fixtures for testing
product assemblies, sub-assemblies or printed circuit assemblies; in-circuit
component measurement testers for testing printed circuit board assemblies; and
intelligent burn-in chambers, which temperature cycle products during
functional test. The Company designs and assembles test systems for testing
customers' products. The Company believes that the design and production of
test equipment is an important factor in its ability to provide products of
consistent and high quality.

Materials and Components

         The Company purchases electronic components from component
manufacturers and electronic component distribution companies. Key commodities
purchased include: printed circuit boards (PCBs), specialized components such
as application specific integrated circuits (ASICs), semi-conductors (i.e.,
integrated circuits, primarily memory and logic devices, and discrete devices),
interconnect products, electronic sub-assemblies (including memory modules,
power supply modules, and cable and wire harnesses), resistors, and capacitors.

         In addition to electronic components, the Company purchases components
for consumption in its higher level assembly and box-build manufacturing. These
components include: sheet metal fabrications, plastic injection molded parts,
aluminum extrusions, die castings, and various other hardware and fastener
components. The components purchased range from standard to highly custom and
cover the spectrums of market volatility and price.

         The Company has strategic suppliers for these components and in
general, the market place for such components has eased over the past few
years. As a result, the Company has not experienced difficulties in obtaining
the components needed for its assemblies. However, during late fiscal 1999 the
market place for such components has tightened from recent periods resulting in
the extension of lead times and increased pricing. Some of these components are
allocated from time to time in response to supply shortages. Supply shortages
could substantially curtail production of some or all assemblies utilizing a
particular component. In addition, at various times industry wide shortages of
electronic components have occurred, particularly of memory and logic devices.
At times, such circumstances can produce short-term interruption of our
operations, and may have a material adverse effect on the results of the
Company. See also Item 7, "Management's Discussion and Analysis of Financial
Condition and Results of Operations -- General."

Customers and Marketing

         The Company performs services for a wide variety of customers ranging
from large multi-national companies to smaller companies, including start-ups.
Because of the variety of services it offers, its flexibility in design and
manufacturing, and its ability to timely respond to customer needs, the Company
believes it is well positioned to offer its services to customers in most
market segments. For many customers, the Company functions as both a design and
production arm thus, permitting customers to concentrate on concept
development, distribution and marketing, speeding time-to-market and reducing
their investment in manufacturing capacity. This method provides an economical
and efficient alternative to in-house design and production.

         The Company markets its services primarily through its own employees.
Additionally, the Company markets its services through advertisements,
technical articles, trade shows, press releases, the Internet and dissemination
of Company brochures.





                                       3
<PAGE>   5

         During fiscal 1999, the Company's services were sold to approximately
140 customers. Customers representing over 10% of the Company's fiscal year net
sales are as follows:

<TABLE>
<CAPTION>
                                                                                      Fiscal Year % of Net Sales
                                                                                   -------------------------------
         Customer                                                                  1999         1998          1997
         --------                                                                  ----         ----          ----
<S>                                                                                <C>          <C>           <C>
         Lucent Technologies Inc. (formerly Ascend Communications, Inc.)           16%           *             *
         General Electric Company                                                  12%           *            11%
         International Business Machines Corporation                                *            *            10%
</TABLE>

                        *represents sales less than 10%

         Many large customers, including those above, contract independently
through multiple divisions, subsidiaries, production facilities or locations.
The Company believes that in many cases its sales to one such subsidiary,
division, facility, or location are not dependent on sales to others. Although
the complete loss of any major customer could have a significant negative
impact on the Company, the Company does not believe the loss of all divisions,
subsidiaries, facilities, or locations of a major customer to be likely. For a
further discussion of sales to these and other large customers, see Item 7
"Management's Discussion and Analysis of Financial Condition and Results of
Operations -- Net Sales"

         Substantially all of Plexus' business is done on a project by project
basis for its customers. Although Plexus has several projects and customers for
which it provides services on a continuing basis, the timing and nature of
particular customer projects can vary significantly from period to period.
Substantial changes in the nature or timing of these projects affect the
Company's sales and profitability from period to period. The Company does not
believe that the backlog of expected product sales covered by firm purchase
orders is a meaningful measure of future sales since orders may be canceled and
volume levels can be changed or delayed at any time.

         The Company regularly considers strategic acquisitions, joint ventures
and strategic partnerships with other companies. Under certain circumstances,
and subject to identification of appropriate candidates, the Company believes
that such transactions may provide an attractive means of growth by providing
access to additional customers and/or by adding new capabilities, capacity or
locations.

Competition

         The market for electronic products and services provided by the
Company is highly competitive, primarily on the basis of engineering, testing
and production capability, technological capabilities and the capacity for
responsiveness, quality and price.

         The capability to design in a timely manner and the capacity to
produce quality items and to assure prompt delivery are particularly important
in the electronics industry. The market in which the Company's customers
compete are characterized by rapidly changing technology, evolving industry
standards and continuous improvements in products and services. The average
product designed and assembled by the Company may have a technological useful
life ranging from 18 months to over five years, dependent on the product and
the industry. Through its design and production services, the Company may serve
as an extension or replacement for its customers' engineering, testing and
manufacturing operations.

         Competitors in the electronics design and assembly field are numerous
and range in size from several very large multi-national companies with
substantially greater resources than the Company to many smaller companies
competing only in specific aspects of the Company's business. In addition, the
Company competes against foreign low-labor cost manufacturers. However, this
competition tends to focus on commodity and consumer related products, which is
not a focus market for Plexus. As a part of its strategic planning process,
however, the Company considers whether the establishment of foreign assembly
operations could be beneficial to the Company. Under appropriate circumstances
and conditions, the Company would consider establishing or acquiring such
foreign operations. The Company also competes against companies who determine
to design or manufacture items in-house rather than contract with a third-party
manufacturer. The Company estimates that it controls less than one percent of
the global market in the outsource electronics manufacturing services industry.





                                       4
<PAGE>   6

Patents And Trademarks

         The Company does not own any material patents or copyrights. The
Company owns the servicemark "Plexus" and has applied for (and is using) the
servicemark "Plexus, The Product Realization Company."

         Plexus has arranged with another company to offer product development
services relating to a 5GHz radio which Plexus developed for the company. The
radio has potential use in a variety of products, particularly RF/wireless
video products. Plexus made these arrangements in connection with the design
services provided to the other company. While Plexus does not have exclusive
rights to the 5GHz radio, Plexus could generate revenue through the design and
manufacturing of products utilizing the radio. Production and sale of any such
products utilizing this technology has not yet commenced. In addition, there
can be no assurance that Plexus' customers will be able to successfully
commercialize products utilizing this technology.

         The Company has had preliminary communications from the Lemelson
Medical, Education & Research Foundation Limited Partnership ("Lemelson")
related to the alleged possible infringement of certain Lemelson patents
relating to machine vision and bar-code technology. Lemelson has pending
litigation with a number of Plexus' competitors and electronics original
equipment manufactures, although no lawsuit has yet been filed against the
Company. Plexus is evaluating Lemelson's claim, but Plexus has not yet
determined if, or to what extent, a license from Lemelson would be required. If
a license is required, based upon Plexus' understanding of the terms of similar
licenses to other parties, Plexus believes (but cannot be certain) that a
license could be obtained on terms that would not have a material adverse
effect on Plexus. However, if a license fee is paid in the future, that could
affect the results for the period or periods in which payment is made or
accrued. Additionally, Plexus believes that it may be contractually indemnified
by the companies from which Plexus purchased the machine vision and bar code
technology equipment.

Environmental Compliance

         The Company is subject to a variety of environmental regulations
relating to the use, storage, discharge and disposal of hazardous chemicals
used during its manufacturing process. Although the Company believes that it is
in compliance with all federal, state and local environmental laws, and does
not anticipate any significant expenditures in maintaining its compliance,
there can be no assurances that violations will not occur which could have a
material adverse effect on the results of the Company.

Employees

         As of December 1, 1999, the Company employed full time approximately
3,150 persons. These employees included approximately 1,450 professional,
technical and engineering employees and approximately 1,700 employees who work
in assembly. The Company also employed 140 temporary employees through various
temporary employment agencies. The Company has never experienced a work
stoppage due to a labor dispute, considers its relations with employees to be
very good, and is not a party to any labor contract. To date, the Company has
had some difficulty fulfilling its employment needs as a result of tightening
labor markets surrounding its primary facilities. The Company is continually
reviewing the employment market and actively making modifications to its
processes and policies in order to competitively attract the necessary
employees. The Company's success depends to a large extent upon the continued
services of key managerial and technical employees. The loss of such personnel
could have a material adverse effect on the Company and its results of
operations.

Year 2000 Issues

         The Company's Year 2000 program is discussed in "Item 7 Management's
Discussion and Analysis of Financial Condition and Results of Operations -- Year
2000 Issues."





                                       5
<PAGE>   7

ITEM 2. PROPERTIES

         Certain information about the Company's facilities is included in the
following table.

<TABLE>
<CAPTION>
                PLANT LOCATION               PLANT TYPE                 SIZE (sq. ft.)     OWNED/LEASED
                --------------               ----------                 --------------     ------------
<S>                                          <C>                        <C>                <C>
              * Neenah, Wisconsin            Manufacturing                   285,000          Leased
                Green Bay, Wisconsin         Manufacturing                   110,000          Leased
              * Neenah, Wisconsin            Manufacturing                    95,000          Owned
                Bothell, Washington          Manufacturing                    60,000          Leased
                Richmond, Kentucky           Manufacturing                    45,000          Owned
                Wheeling, Illinois           Manufacturing                    25,000          Leased
                Redmond, Washington          Manufacturing                    21,000          Leased
                Blaine, Minnesota            Manufacturing                    14,000          Owned

             ** Neenah, Wisconsin            Headquarters & Engineering       45,000          Owned
                Bothell, Washington          Engineering                      81,000          Leased
                Raleigh, North Carolina      Engineering                      14,000          Leased
                Louisville, Colorado         Engineering                      14,000          Leased
                Milpitas, California         Engineering                       5,000          Leased

            *** Redmond, Washington          Office/warehouse                 60,000          Leased
              * Neenah, Wisconsin            Office/warehouse                100,000          Leased
            *** Bothell, Washington          Office/warehouse                 10,000          Leased
                Blaine, Minnesota            Office/warehouse                  5,200          Leased
</TABLE>

      * More than one building is included at this site.

     ** The Technology Center, which provides office, design and testing space
        for the Company, is being expanded by approximately 60,000 square feet
        to accommodate growth in the engineering subsidiary. The expansion is
        expected to be completed in October 2000.

    *** Building is being subleased to an unrelated party.

         The Company utilizes specialized equipment in its operations. The
Company leases a substantial amount of this equipment. The Company believes
that its equipment and facilities are modern, well maintained and adequate for
its present needs. However, continued expansion of the Company's business may
require additional facility expansion in the future.

ITEM 3. LEGAL PROCEEDINGS

         There are no material pending legal proceedings required to be
disclosed herein to which the Company is a party of or which any of its
property is the subject.





                                       6
<PAGE>   8

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

         No matters were submitted to a vote of security holders during the
fourth quarter of fiscal 1999.

EXECUTIVE OFFICERS OF THE REGISTRANT

         The following table contains certain information regarding the present
executive officers of the Company, who are elected by the Board of Directors
after each annual meeting of shareholders for one-year terms or until replaced
by the Board of Directors.

<TABLE>
<CAPTION>
                                                                                                        PRESENT OFFICE
          NAME                 AGE                                POSITION                                HELD SINCE
          ----                 ---                                --------                              --------------
<S>                            <C>      <C>                                                             <C>
Peter Strandwitz                62      Chairman, Chief Executive Officer, Director                         1979
John L. Nussbaum                57      President, Chief Operating Officer, Director                        1996 (1)
Dean A. Foate                   41      Executive Vice President                                            1999 (2)
Thomas B. Sabol                 40      Vice President-Finance and Chief Financial Officer                  1996 (3)
Joseph D. Kaufman               42      Vice President, Secretary and General Counsel                       1990
J. Robert Kronser               40      Vice President-Sales and Marketing                                  1999 (4)
Charles C. Williams             63      Vice President                                                      1989
Lisa M. Kelley                  33      Treasurer and Chief Accounting Officer                              1998 (5)
</TABLE>

(1)  Mr. Nussbaum has served as President and a director of the Company since
     1980. Mr. Nussbaum became Chief Operating Officer in 1996.

(2)  Mr. Foate joined the Company in February 1984, serving various engineering
     roles. From 1995 to present, Mr. Foate serves as President of Plexus
     Technology Group. Additionally, in May 1999, Mr. Foate became Executive
     Vice President.

(3)  Mr. Sabol joined the Company in January 1996. From 1993 to 1995, Mr. Sabol
     served as Vice President and General Auditor for Kemper Corporation. Prior
     to that time Mr. Sabol served as Business Assurance Manager for Coopers &
     Lybrand.

(4)  Mr. Kronser joined the Company in May 1981, serving various engineering
     roles. From 1993 to July 1999, Mr. Kronser managed the Advanced
     Manufacturing Center. In May 1999, Mr. Kronser became Vice President of
     Sales and Marketing.

(5)  Ms. Kelley joined the Company in September 1992. Positions held within the
     Company included Manager, Subsidiary Controller, and Assistant Corporate
     Controller. In 1997, she became the Corporate Controller. In 1998, Ms.
     Kelley became Treasurer.

                                    PART II

ITEM 5. MARKET FOR THE REGISTRANT'S COMMON EQUITY AND RELATED SHAREHOLDER
MATTERS

Information on Common Stock

         For the years ended September 30, 1999 and 1998, the Company's Common
Stock has traded on the NASDAQ National Market System; the price information
represents high and low sale prices for each period.

PRICE RANGE OF COMMON STOCK:

<TABLE>
<CAPTION>
        Fiscal Year Ended September 30, 1999                           Fiscal Year Ended September 30, 1998
        ------------------------------------                           ------------------------------------
                                  High        Low                                           High          Low
                                  ----        ---                                           ----          ---
<S>                              <C>         <C>                <C>                        <C>           <C>
First Quarter                    34 3/4      17                 First Quarter              35 1/8        13 1/8
Second Quarter                   40 1/4      25 5/8             Second Quarter             22 1/2        12 3/8
Third Quarter                    34 3/4      26 3/4             Third Quarter              24            16 1/4
Fourth Quarter                   34 3/8      27 7/8             Fourth Quarter             22 3/4        13 3/4
Year                             40 1/4      17                 Year                       35 1/8        12 3/8
</TABLE>

         As of September 30, 1999, there were approximately 9,000 shareholders
of record.

         The Company has not paid any cash dividends. See Item 7 "Management's
Discussion and Analysis of Financial Condition and Results of
Operations--Liquidity and Capital Resources" for a discussion of the Company's
dividend intentions.





                                       7
<PAGE>   9

ITEM 6. SELECTED FINANCIAL DATA

Financial Highlights (1)
(dollars in thousands, except per share amounts)

<TABLE>
<CAPTION>
                                                               For the years ended September 30,
Operating Statement Data                          1999           1998         1997         1996         1995
- ------------------------                          ----           ----         ----         ----         ----
<S>                                             <C>            <C>          <C>          <C>          <C>
Net sales                                       $492,414       $466,795     $438,565     $342,254     $300,795
Gross profit                                      66,409(3)      60,147       51,232       31,160       26,588
Gross margin                                        13.5%          12.9%        11.7%         9.1%         8.8%
Operating income                                  34,428(3)      36,393       30,769       15,614       13,507
Operating margin                                     7.0%           7.8%         7.0%         4.6%         4.5%
Net income                                        20,311(3)      22,937       18,893        8,350        7,073
Earnings per share (diluted) (2)                $   1.10(3)    $   1.27     $   1.08     $   0.52     $   0.45

Cash Flow Statement Data
- ------------------------
Cash flows provided by
     operations                                 $ 15,157       $ 29,843     $ 18,347     $ 28,947     $  4,845
Capital equipment additions                       18,196         11,997       13,488        5,636        3,291

Balance Sheet Data
- ------------------
Working capital                                 $110,411       $ 91,159     $ 70,544     $ 55,683     $ 75,374
Total assets                                     229,636        184,354      152,453      122,301      124,345
Long-term debt                                       142          2,587        3,516       16,658       42,955
Stockholders' equity                             146,403        115,863       89,404       53,788       45,826
Return on average assets                             9.8%          13.6%        13.8%         6.8%         5.6%
Return on average equity                            15.5%          22.3%        26.4%        16.8%        17.0%
Inventory turnover ratio                            6.2x           7.1x         6.6x         5.6x         4.8x
</TABLE>

- ---------
(1)      As a result of the merger with SeaMED, the historical results have
         been restated utilizing the pooling of interests method of accounting.
         See Notes 1 and 8 in the Notes to Consolidated Financial Statements.

(2)      All share and per share information reported throughout this annual
         report on Form 10-K has been restated (except where noted) to give
         effect to the Company's two-for-one stock split effective August 25,
         1997.

(3)      In connection with the acquisition of SeaMED Corporation, the Company
         recorded merger and other one-time related charges of $7.7 million
         ($6.0 million after-tax). Excluding this charge, gross profit was
         $68.6 million (13.9% of net sales), and operating income was $42.1
         million (8.6% of net sales). Net income excluding this charge was
         $26.3 million (5.3% of net sales), and diluted earnings per share was
         $1.42.





                                       8
<PAGE>   10

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

STATEMENT FOR PURPOSES OF THE "SAFE HARBOR" PROVISION OF THE PRIVATE SECURITIES
LITIGATION REFORM ACT OF 1995

         Management's Discussion and Analysis of Financial Condition and
Results of Operations, with the exception of historical matters, are
forward-looking statements (such as statements in the future tense and
statements including "believe", "expect", "intend", "plan", "look forward to",
"anticipate" and similar terms) that involve risks and uncertainties. Actual
results may differ materially from these statements as a result of various
factors, including those discussed in further detail below (in particular
"General" and "Year 2000 Issues").

GENERAL

         Plexus Corp. is a contract service provider of design, manufacturing
and testing services to the electronics industry, headquartered in Neenah,
Wisconsin. Through its wholly owned subsidiaries, Plexus Technology Group,
Inc., Plexus Electronic Assembly Corporation, and SeaMED Corporation, the
Company provides product realization services to original equipment
manufacturers in the medical, computer (primarily mainframes, servers and
peripherals), industrial, networking, telecommunications and transportation
electronics industries. The Company offers a full range of services including
product development and design, material procurement and management,
prototyping, assembly, testing, manufacturing, final system box build,
distribution and after market support.

         The Company's contract manufacturing services are provided on either a
turnkey basis, where the Company procures certain or all of the materials
required for product assembly, or on a consignment basis, where the customer
supplies some, or occasionally all, materials necessary for product assembly.
Turnkey services include material procurement and warehousing, in addition to
manufacturing, and involve greater resource investment and inventory risk
management than consignment services. Turnkey manufacturing currently
represents almost all of the Company's sales. Turnkey sales typically generate
higher net sales and higher gross profit dollars with lower gross margin
percentages than consignment sales due to the inclusion of component costs, and
related markup, in the Company's net sales. However, a change in component
costs can directly impact the average selling price, gross margins and the
Company's net sales. Due to the nature of turnkey manufacturing, the Company's
quarterly and annual results are affected by the level and timing of customer
orders, fluctuations in materials costs, and the degree of automation used in
the assembly process.

         Since a substantial portion of the Company's sales are derived from
turnkey manufacturing, net sales can be negatively impacted by component
shortages and their lead-times. Shortages of key electronic components which
are provided directly from customers or suppliers and their lead-times can
cause manufacturing interruptions, customer rescheduling issues, production
downtime and production set-up and restart inefficiencies. From time to time,
allocations of components can be an integral part of the electronics industry
and component shortages and extended lead-time issues can occur with respect to
specific industries or particular components (such as memory and logic
devices). In such cases, supply shortages could substantially curtail
production of some or all assemblies utilizing a particular component. In
addition, at various times industry wide shortages of electronic components
have occurred, particularly of memory and logic devises. Over the past three to
six months the marketplace for certain electronic components, primarily in the
telecommunications and wireless markets (in particular flash memory, tantalum
capacitors, and SAW fibers), has tightened from recent periods. This has
resulted in the extension of certain component lead-times, increased pricing
and in certain instances has resulted in the allocation of such components by
the suppliers. In response to this dynamic environment, the Company has a
corporate procurement organization whose primary purpose is to create strong
supplier alliances to assure a steady flow of components at competitive prices
and mitigate shortages. Strategic relationships have been established with
international purchasing offices to improve shortage and pricing issues.
However, because of the limited number of suppliers for certain electronic
components and whether further tightening in the marketplace for components
could result in missed deliveries or de-commits form our suppliers, along with
other supply and demand concerns, the Company can neither eliminate component
shortages nor determine the timing or impact of such shortages on the Company's
results. In addition, because we provide our customers component procurement
services, we may bear the risk of price increases for these components if we
are unable to purchase them at the same price that we agree with our customer
on the pricing for the components. In order to mitigate the Company's financial
risk of component price increases, the Company regularly reviews and adjusts
for price fluctuations with customers. As a result, the Company's sales and
profitability can be affected from period to period.

         Many of the industries for which the Company currently provides
electronic products are subject to rapid technological changes, product
obsolescence, increased competition, and pricing pressures. In fiscal 1999,
approximately 4 percent of the Company's total sales were foreign. These and
other factors which affect the industries or the markets that the Company
serves, and which affect any of the Company's major customers in particular,
could have a material adverse effect on the Company's results of operations.



                                       9
<PAGE>   11

         The Company has no long-term volume commitments from its customers,
and lead-times for customer orders and product-life cycles continue to
contract. Although the Company obtains firm purchase orders from its customers,
they typically do not make firm orders for delivery of products more than 30 to
90 days in advance. The Company does not believe that the backlog of expected
product sales covered by firm purchase orders is a meaningful measure of future
sales since orders may be canceled and volume levels can be changed or delayed
at any time. The timely replacement of delayed, canceled or reduced programs
with new business cannot be assured. Because of these and other factors, there
can be no assurance that the Company's historical sales growth rate will
continue. See "Results of Operations -- Net Sales" below for certain factors
affecting net sales to the Company's largest customers.

         The Company believes that its growth has been achieved in significant
part by its approach to partnering with customers mainly through its product
design and development services. Approximately 20 percent of the Company's
contract manufacturing sales are a direct result of these services. The Company
intends to continue to leverage this aspect of its product design and
development services for continued growth in contract manufacturing revenues.
Currently, the design and development services are less than 10 percent of
total sales. In order to achieve expanded sales growth, the Company must
continue to generate additional sales from existing customers from both current
and future programs, and must successfully market to new customers. The Company
must also successfully integrate and leverage its new regional product design
centers in North Carolina, Colorado and Washington into this strategy. In
addition, the Company must continue to attract and retain top quality product
development engineers in order to continue to expand its design and development
services. Because of these and other factors, there can be no assurance that
the Company's historic growth rate or profitability levels will continue.

         Start-up costs and the management of labor and equipment efficiencies
for new programs and new customers can have an effect on the Company's gross
margins. Due to these and other factors, gross margins can be negatively
impacted early on in the life cycle of new programs. In addition, labor
efficiency and equipment utilization rates ultimately achieved and maintained
by the Company for new and current programs impact the Company's gross margins.

         The Company continues to look for opportunities for geographical
expansion that will improve the Company's ability to provide services to its
customers. Geographical expansion and growth by acquisition can have an effect
on the Company's operations. In addition, should the Company determine to
expand internationally, that foreign expansion could create additional
integration issues as a result of differences in foreign laws and customs, as
well as distance and other factors affecting international trade. The
successful integration and operation of an acquired business, including SeaMED
and the Chicago, Illinois area facility, will require communication and
cooperation among key managers, along with the transition of customer
relationships. Acquisitions also involve risks including the retention of key
personnel and customers, the integration of information systems and purchasing
operations, the management of an increasingly larger and more geographically
dispersed business, and the diversion of management's attention from other
ongoing business concerns. In addition, while the Company anticipates cost
savings, operating efficiencies and other synergies as a result of its
acquisitions, the consolidation of functions and the integration of
departments, systems and procedures present significant management challenges.
The Company cannot assure that it will successfully accomplish those actions as
rapidly as expected. Also, the Company cannot assure the extent to which it
will achieve cost savings and efficiencies in any transaction or expansion.
There can be no assurance that the Company will successfully manage the
integration of new locations or acquired operations, and the Company may
experience certain inefficiencies that could negatively impact the results of
operations or the Company's financial condition. Additionally, no assurance can
be given that any past or future acquisition by the Company, including that of
SeaMED and the Chicago, Illinois area facility, will enhance the Company's
business.

         The acquisition of new operations can introduce new types of risks to
the Company's business. For example, additional risk factors specific to
SeaMED's business and its operations include financing issues associated with
SeaMED's emerging medical customers, Food and Drug Administration (FDA)
requirements associated with Class III and pre-market approval (PMA) medical
devices designed and manufactured by SeaMED, and the uncertainty of third party
reimbursement such as Medicare, private health insurance companies or health
maintenance organizations by SeaMED's customers for the cost of their products.

         The Company operates in a highly competitive industry. The Company
faces competition from a number of domestic and foreign electronic
manufacturing services companies, some with financial and manufacturing
resources significantly greater than the Company's. The Company also faces
competition in the form of current and prospective customers that have the
capabilities to develop and manufacture products internally. In order to remain
a viable alternative, the Company must continue to enhance its total
engineering and manufacturing technologies.

         Other factors that could adversely affect forward-looking statements
include the level of overall growth in the electronics industry, the Company's
ability to integrate and extract value from acquired operations, the Company's
ability to secure new customers and maintain its current customer base, the
results of cost reduction efforts, material cost fluctuations and the adequate
availability of components and related parts for production, the effect of
changes in average selling prices, the risk of customer delays



                                      10
<PAGE>   12

or cancellations in both on-going and new programs, the effect of start-up
costs related to new programs and facilities, year 2000 compliance issues
(including those discussed below), the overall economic conditions, the impact
of increased competition and other factors and risks detailed herein and in the
Company's other Securities and Exchange Commission filings.

MERGER AND ACQUISITION

         On July 23, 1999, Plexus acquired SeaMED through issuance of
approximately 2.27 million shares of its common stock in exchange for all
outstanding common stock of SeaMED. SeaMED stock options outstanding, as of the
merger date, were exchanged for options to acquire approximately 171,764 shares
of Plexus common stock at the same time. SeaMED is a provider of engineering
and manufacturing services, coupled with regulatory expertise, of advanced
medical instruments for medical technology companies. All merger costs and
other one-time expenses related to the SeaMED merger have been expensed as
required under the pooling of interests method of accounting. Certain
merger-related costs, which included charges related to obsolete inventories
and a loss on an engineering contract, have been included in cost of sales in
the consolidated statement of operations. All such costs and expenses amounted
to $6.0 million after income taxes in fiscal 1999 and are reflected in the
financial statements as follows (in thousands):

<TABLE>
<S>                                                           <C>
         Cost of sales                                        $ 2,177
         Plant closing, relocation and severance                  981
         Merger costs                                           4,557
                                                              -------
                                                                7,715
         Less: income tax benefit                               1,684
                                                              -------
         Net merger and other one-time charges                $ 6,031
                                                              =======
</TABLE>

         The consolidated financial statements have been prepared following the
pooling of interests method of accounting for the merger and therefore reflect
the combined financial position, operating results and cash flows of the two
companies for all periods presented. SeaMED had a June 30 fiscal year end.
Prior to fiscal 1999, the combined financial statements reflect Plexus'
September 30 financial position and results and SeaMED's June 30 financial
position and results. For fiscal 1999, the combined financial statements
reflect the October 1, 1998 through September 30, 1999 period for both
companies. SeaMED's results of operations and cash flows from July 1, 1998 to
September 30, 1998, which have been excluded from these consolidated financial
statements, are reflected as adjustments in the 1999 consolidated statements of
stockholders' equity and cash flows. Net sales and net income for SeaMED for
the excluded period from July 1, 1998 to September 30, 1998 were $19.4 million
and $1.3 million, respectively.

         On September 1, 1999, Plexus Corp. purchased certain printed circuit
board assembly manufacturing assets in the Chicago, Illinois area from an
unrelated party. The manufacturing assets which consisted principally of
equipment and inventories were purchased at approximately fair market value.
The Company also leases a portion of a manufacturing facility owned by the
unrelated party which houses the printed circuit board operations. The Company
has agreed to acquire certain other assets from the same unrelated party in
fiscal 2000. The total purchase price of the net assets acquired in fiscal 1999
and to be acquired in fiscal 2000 is not material to the assets or
stockholders' equity of the Company. Pro forma statements of operations for
fiscal 1999 and 1998 reflecting this acquisition are not shown as they would
not differ materially from the reported results.

YEAR 2000 ISSUES

         The Company has a corporate information technology organization whose
primary purpose is to ensure vision and direction of information systems to
meet internal and external needs. The Company must keep pace with rapid
technological developments in its management information systems and its
production facilities and equipment, and can experience costs and conversion
difficulties in connection with the implementation of new systems and
processes. In addition, like all other companies, the Company must assure that
its computer and software systems, and other machinery and systems that depend
upon computer-driven operations or which have embedded chips or
micro-processors, are capable of accurately functioning and accurately
recognizing and processing data in the year 2000 and beyond ("Year 2000
Compliant").

         The Company has developed a Year 2000 compliance strategy and
methodology to assure the Company can continue to provide engineering and
manufacturing services in the year 2000 and beyond. All mission critical issues
have met internal documentation, compliancy and testing, including the
Company's A/S400 hardware and software system, which handles virtually all
production data processing and accounting.

         The Company's Year 2000 strategy has defined focus teams responsible
for information systems including hardware and software; production and
facility equipment and systems; test equipment and software; engineering
development systems; component and inventory issues; customer and supplier
issues; and third party agents and extended enterprises. Each team completed
four phases to assure Year 2000 compliance which included a complete inventory
and risk assessment of items or issues (risk assessment defined



                                      11
<PAGE>   13

as mission critical, non mission critical, or not date sensitive); a strategy
plan including contingencies or remediation; the actual conversion or
remediation including testing and documentation; and compliancy approval.

         By July 1999, the Company had substantially completed an internal
inventory and risk assessment, remediation and testing of all other mission
critical internal systems including: hardware, software, production and
facility equipment, test equipment and software, engineering development
systems, and embedded chips in components and inventory. The Company
inventoried every significant supplier of goods and services, and considered
the potential impact of Year 2000 compliance on the Company and its customers.
In addition, the Company has evaluated and audited the key suppliers' response
to our mailing surveys. A complete review and test of EDI linkages and data
transmission for its customers and suppliers was also completed.

         The Company has established contingency plans to address and
prioritize business recovery and resumption activities of critical functions
should unexpected failure occur. The plan will continue to be updated and
exercised regularly to ensure the ability to meet our customers' requirements,
to minimize financial hardship, or to meet legal obligations.

         The costs to date associated with the Company's Year 2000 compliancy
plan have been mostly current internal labor expenses and were not material to
the Company's results. Future compliancy costs have not been determined, but
are not expected to be material. Other non-Year 2000 efforts have not been
materially delayed or impacted by Year 2000 compliancy plan initiatives. There
can be no assurance that these estimates of future costs will prove to be
accurate and actual results could differ materially from those currently
anticipated.

         The Company presently believes that the Year 2000 issue will not pose
significant operational problems for the Company. However, if all Year 2000
issues are not properly identified, or assessment, remediation and testing are
not effected timely with respect to Year 2000 problems that are identified,
there can be no assurance that the Year 2000 issue will not materially
adversely impact the Company's results of operations or adversely affect the
Company's relationships with customers, vendors or others. The most reasonably
likely worst case scenario could cause a production shut down in one or more
facilities. The Company would rely on its' standard disaster recovery plan and
Year 2000 contingency plans for such occurrence. Although the plans would seek
to quickly restart or shift production, such an outage could at least
temporarily affect production, sales and the results of operations. There can
be no assurance that the Year 2000 issues of other entities will not have a
material adverse impact on the Company's systems or results of operations,
liquidity and financial condition. Additionally, there can be no assurance that
potential future costs of defending and resolving claims will not have a
material adverse impact on the Company's results of operations, liquidity and
financial condition.

RESULTS OF OPERATIONS

Net Sales

         In fiscal 1999, net sales were $492 million, an increase of $25
million, or 5 percent, over the previous year. Net sales in fiscal 1998 were
$467 million, an increase of $28 million, or 6 percent, over fiscal 1997.

         For fiscal 1999, unit volume sales were strong; however, sales growth
was impacted by industry-wide pressure on average selling prices, component
prices, and on the Company's continued focus to move toward higher technology
business. These factors are expected to continue. In addition, sales by SeaMED
decreased approximately $8 million from fiscal 1998 levels. Although there can
be no assurances, the Company presently anticipates sales volume to increase,
subject to the development and timing of new customers, new programs and future
acquisitions.

         Sales for fiscal 1998 increased due to the addition of new programs
and new customers, primarily Lucent Technologies Inc. ("Lucent", previously
Ascend Communications, Inc.). Sales to Lucent exceeded 10% of total sales for
the second half of fiscal 1998. This increase was offset by several factors
including (1) the decision by certain customers to transition manufacturing
into their own in-house manufacturing facilities, primarily Motorola, Inc. (2)
the Company's decision to exit from certain automotive and other
commodity-oriented markets, primarily computer peripherals, whose businesses
are no longer compatible with the Company's long-term growth plans, (3)
decreasing component pricing with related decreases in average selling prices,
(4) a general weakening of certain markets, primarily
industrial-semiconductors, in which the Company operates, and (5) the negative
effects of the strong U.S. dollar and the Southeast Asian market's unfavorable
economic conditions and the impact of such on a few customers.

         Sales for fiscal 1999 to the industries the Company services remained
fairly consistent with fiscal 1998, except for the increase in the
networking/telecom industry from 15 percent to 24 percent of total sales which
was offset by a decline in the computer industry to 14 percent from 23 percent
of total sales. The large increase in the networking/telecom industry was
primarily a result of increased sales to Lucent, in fiscal 1999. Sales for
fiscal 1999 for the other industries were as follows: Medical 31 percent (29
percent in fiscal 1998), Industrial 23 percent (20 percent in fiscal 1998),
Transportation 7 percent (11 percent in fiscal 1998), and



                                      12
<PAGE>   14

Other 1 percent (2 percent in fiscal 1998). For fiscal 2000, the Company
currently expects sales to the networking/telecom industry to continue to grow.

         The Company's largest customers for fiscal 1999 were Lucent (including
two subsidiaries or divisions), which accounted for 16 percent of total sales,
and General Electric Company (GE) (including up to four subsidiaries or
divisions), which accounted for 12 percent of total sales. In fiscal 1998, no
customers accounted for more than 10 percent of the Company's total sales. In
fiscal 1997, GE and International Business Machines Corporation (IBM)
(including up to six subsidiaries or divisions), accounted for 11 percent and
10 percent of total sales, respectively. The Company is dedicated to
diversifying its customer base and decrease its dependence on any particular
customer or customers. The Company believes each division or subsidiary of
these customers contracts independently of the other divisions or subsidiaries.
Currently the Company expects sales from Lucent to grow and from GE to remain
steady in fiscal 2000, although these amounts are subject to future orders and
may vary from the Company's expectations.

         Sales to the Company's ten largest customers accounted for 61 percent
of total revenues in each of the fiscal years 1999, 1998, and 1997. While the
Company expects similar results for the total percent of sales accounted for by
the ten largest customers, the continuation of a diversified customer base is
expected to change the customer mix. The Company remains dependent upon
continued sales to Lucent, GE, and its other significant customers. Any
material change in orders from these or other customers could have a material
effect on the Company's results of operations.

Gross Profit

         Gross profit of $66.4 million increased by $6.3 million, or 10
percent, in fiscal 1999 compared to fiscal 1998, and by $8.9 million, or 17
percent, during fiscal 1998 compared to fiscal 1997. The gross margin increased
to 13.5 percent in fiscal 1999. Excluding the one-time SeaMED merger-related
charges of $2.2 million related to the write down of obsolete inventory and a
loss on an engineering contract, the fiscal 1999 gross profit and margin was
$68.6 million, or 13.9 percent, respectively. In fiscal 1998 and 1997, the
gross profit and margin were $60.1 million, or 12.9 percent, and $51.2 million,
or 11.7 percent, respectively.

         The continued improvement in gross margin in fiscal 1999 compared to
fiscal 1998 and fiscal 1997 reflects the Company's focus on business mix,
leading-technology products and markets, and continued operating efficiencies
which were partially offset by increased costs for expansion of engineering and
technical manufacturing capabilities to meet customer demands.

         Most of the research and development conducted by the Company is paid
for by customers and is, therefore, included in cost of sales. Other research
and development is conducted by the Company, but is not specifically
identified, as the Company believes such expenses are less than 1 percent of
its total sales.

         The Company's gross margin also reflects a number of other factors
which can vary from period to period, including product mix, the level of
start-up costs and efficiencies of new programs, product life cycles, sales
volumes, price erosion within the electronics industry, capacity utilization of
surface mount and other equipment, labor costs and efficiencies, the management
of inventories, component pricing and shortages, average sales prices, the mix
of turnkey and consignment business, fluctuations and timing of customer
orders, changing demand for customer's products and competition within the
electronics business. The acquisition of SeaMED has initially reduced gross
margins and is expected to continue to have that effect until synergies and
efficiencies are realized and SeaMED's cost structure is aligned with its
reduced sales volume. These and other factors can cause variations in the
Company's operating results. While the Company's focus is on maintaining and
expanding gross margins, there can be no assurance that gross margins will not
decrease in future periods.

Operating Expenses

         Selling and administrative (S&A) expenses increased to $26.4 million
in fiscal 1999, compared to $23.8 million in fiscal 1998, and $20.5 million in
fiscal 1997. As a percentage of sales, S&A expenses were 5.4 percent, 5.1
percent and 4.7 percent in fiscal 1999, 1998 and 1997, respectively. The
increase in S&A expenses was mainly attributable to increased engineering,
sales and marketing, and information systems support. The Company anticipates
future S&A expenses will increase in absolute dollars but should remain around
5.0 percent of sales, as the Company builds the infrastructure necessary to
integrate SeaMED, as well as to continue to support the Company's growth.

         In fiscal 1999, the Company also had one-time merger costs of $4.6
million and other one-time merger-related charges (primarily for plant
closings, relocation and severance) of $1.0 million, associated with the
acquisition of SeaMED.





                                      13
<PAGE>   15

Other Income (Expense)

         Interest expense was $0.3 million in fiscal 1999, compared to $0.1
million in fiscal 1998 and $1.0 million in fiscal 1997. The decrease in
interest expense levels is primarily due to reduced borrowings required to
support working capital and the payment of SeaMED's outstanding bank debt upon
its acquisition by the Company. See "Liquidity and Capital Resources." As a
result of investing excess cash, interest income and gains on investments was
$2.0 million in fiscal 1999, compared to $0.8 million and $0.4 million in
fiscal 1998 and 1997, respectively. Other miscellaneous income in fiscal 1997
included approximately $0.6 million in gains from the buyout and sale of
certain leased manufacturing equipment.

Income Taxes

         Income taxes increased to $15.8 million in fiscal 1999, from $14.3
million in fiscal 1998, and $12.0 million in fiscal 1997, as a result of
increased earnings. The Company's effective income tax rate for fiscal 1999
increased as a result of non-tax deductible merger expenses. Excluding these
one-time expenses the effective tax rate has remained constant at rates between
38 percent to 40 percent in fiscal 1999, 1998, and 1997. These rates
approximate the blended Federal and state statutory rate as a result of the
Company's operations being located within the United States.

LIQUIDITY AND CAPITAL RESOURCES

         Cash flows from operating activities were $15.2 million in fiscal
1999, compared to $29.8 million in fiscal 1998. Cash from operations in fiscal
1999 was provided primarily by net profits and an increase in accounts payable,
offset by increases in inventory and accounts receivable. Inventory turnover
was 6.2 turns as of September 30, 1999, reduced from 7.1 turns as of September
30, 1998, primarily as a result of the Company providing a vendor managed
inventory program for a large customer beginning in the fourth quarter of
fiscal 1999, which was also primarily responsible for the significant increase
in inventory for fiscal 1999.

         Cash flows used in investing activities, includes net purchases or
(net sales and maturities) of short-term investments during fiscal 1999, 1998
and 1997 of $11.7 million, ($0.7) million and $6.2 million, respectively.
Investing activities also includes capital additions of $18.2 million, which
includes the Chicago, Illinois area manufacturing equipment, for fiscal 1999
were primarily concentrated in surface mount assembly equipment, engineering
workstations and related software, and management information systems hardware
and software. Payments for property, plant and equipment for fiscal 1998 and
1997 were $12.0 million and $13.5 million, respectively. These acquisitions
were financed from working capital.

         In fiscal 1999, the Company obtained approximately $9 million in net
capital as a result of stock option exercises and related tax benefit, which
was offset by the payoff of SeaMED loans following the merger. The Company had
maintained a stock buy-back program, which was rescinded in March 1999 in
contemplation of the acquisition of SeaMED. Prior to rescinding the plan, the
Company had purchased 246,200 shares for $4.6 million.
All such shares have been reissued.

         The Company utilizes available cash, debt and operating leases to fund
its manufacturing equipment needs. The Company utilizes operating leases
primarily in situations where technical obsolescence concerns are determined to
outweigh the benefits of financing the equipment purchase. The Company
estimates capital expenditures for fiscal 2000 to be approximately $25 million,
including the expansion to the Neenah, Wisconsin engineering facility currently
in progress. The Company expects to fund these additions through current cash
and short-term investments, cash flows from operations and the revolving credit
agreement. If the Company were to determine to make an acquisition or a more
significant expansion, additional resources could be required.

         An 110,000-square-foot manufacturing facility located in Green Bay,
Wisconsin, began production in April 1997. Annual lease payments by the Company
for the building and the equipment are based on the profitability of the
facility pursuant to a formula defined in the lease agreement. There are no
required minimum lease payments, although it involves a sharing of potential
future profits (if any) from the facility. The Company is a defendant in
litigation relating to this lease filed by an affiliate of the facility owner.
The suit claims that the Company misrepresented the potential profitability of
the facility, and seeks damages. The Company believes that the claims are
without merit, and is defending the action vigorously. However, negative
developments in this litigation could adversely affect the Company's operations
and the results thereof.

         There have been no borrowings under the Company's revolving credit
agreement since October 1, 1997 and the Company paid SeaMED's outstanding bank
debt upon the SeaMED merger. The ratio of total debt-to-equity as of September
30, 1999 and 1998, was 0.6 to 1.

         Working capital was $110.4 million at September 30, 1999 and $91.2
million at September 30, 1998. The Company's future needs for financial
resources include increases in working capital to support anticipated sales
growth and investment in manufacturing



                                      14
<PAGE>   16

and engineering facilities and equipment. However, because of the dynamics of
the Company's industry, the exact timing and amount of these increases cannot
be determined. Currently, the Company anticipates incurring future facility
related expenditures in connection with the expansion of its engineering
headquarters in Neenah, Wisconsin. The Company also intends to actively
evaluate geographical expansion and growth by acquisition.

         The Company believes that its $40 million long-term revolving credit
agreement, leasing capabilities, cash and short-term investments and projected
cash from operations will be sufficient to meet its working capital and capital
requirements through fiscal 2000 and the foreseeable future. While there can be
no assurance that future financing will be available on terms acceptable to the
Company, the Company may seek to raise additional capital through the issuance
of either public or private debt or equity securities to finance future
acquisitions. Debt financing may require the Company to pledge assets as
collateral and comply with certain financial ratios and covenants. Equity
financing may result in dilution to stockholders.

         The Company has not paid dividends on its common stock, but has
reinvested its earnings to support its working capital and expansion
requirements. The Company intends to continue to utilize its earnings in the
development and expansion of the business and does not expect to pay cash
dividends in the foreseeable future.

NEW ACCOUNTING PRINCIPLES

         In March 1998, the American Institute of Certified Public Accountants
("AICPA") issued Statement of Position ("SOP") 98-1, "Accounting for the Costs
of Computer Software Developed or Obtained for Internal Use", which specifies
the accounting treatment of computer software costs depending upon the type of
costs incurred. This SOP is effective for the Company's fiscal year 2000
financial statements and restatement of prior years will not be required. The
Company does not believe the adoption of this SOP will have a significant
impact on its financial position or results of operations.

ITEM 7A. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

         The following discussion about the Company's risk-management
activities may include forward-looking statements that involve risk and
uncertainties. Actual results could differ materially from those discussed.

         The Company has financial instruments, including cash equivalents,
short-term investments and long-term debt arrangements, which are sensitive to
changes in interest rates. The Company currently does not use any interest-rate
swaps or other types of derivative financial instruments to limit its
sensitivity to changes in interest rates because of the relatively short-term
maturities (from one day to less than one year) of its cash equivalents and
short-term investments, and immaterial amount of long-term debt outstanding.
The Company invests in high credit quality issuers and, by policy, limits the
amount of principal exposure to any one issuer.

         The Company's only material interest rate risk associated with its
outstanding debt in fiscal 1999 related to a variable rate note of SeaMED (with
which the Company acquired in fiscal 1999). Such debt was paid in full at the
time of the acquisition. The Company's financing arrangements in place at
September 30, 1999, subject it to future interest rate risk, as such
arrangements include provisions for variable interest rates which would be
based upon market conditions at the time the funds are borrowed. See Note 4 of
Notes to Consolidated Financial Statements, included in Item 8 below, for
further information of the Company's financing arrangements.

         The Company does not believe there have been any material changes in
the reported market risks faced by the Company since the end of its most recent
fiscal year September 30, 1999.

ITEM 8.  FINANCIAL STATEMENTS AND SUPPLEMENTARY DATA.

         See following "List of Financial Statements and Financial Statement
Schedules", and accompanying reports, statements and schedules, which follow
beginning on page 17.

ITEM 9.  CHANGES IN AND DISAGREEMENTS WITH ACCOUNTANTS ON ACCOUNTING AND
         FINANCIAL DISCLOSURE.

         None.





                                      15
<PAGE>   17

                                    PART III

ITEM 10. DIRECTORS AND EXECUTIVE OFFICERS OF THE REGISTRANT

         Information in response to this item is incorporated herein by
reference to "Election of Directors: in the Registrant's Proxy Statement for
its 2000 Annual Meeting of Shareholders" ("2000 Proxy Statement") and from
"Security Ownership of Certain Beneficial Owners and Management--Section 16(a)
Beneficial Ownership Reporting Compliance" in the 2000 Proxy Statement and
"Executive Officers of the Registrant" in Part I hereof.

ITEM 11. EXECUTIVE COMPENSATION

         Incorporated herein by reference to the paragraph under "Election of
Directors - Directors' Compensation" and "Executive Compensation" in the 2000
Proxy Statement.

ITEM 12. SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT.

         Incorporated herein by reference to "Security Ownership of Certain
Beneficial Owners and Management" in the 2000 Proxy Statement.

ITEM 13. CERTAIN RELATIONSHIPS AND RELATED TRANSACTION

         Incorporated herein by reference to "Certain Transactions" in the 2000
Proxy Statement.

                                    PART IV

ITEM 14. EXHIBITS, FINANCIAL STATEMENT SCHEDULES, AND REPORTS ON FORM 8-K

(a)      Documents filed:

         1. and 2. Financial Statements and Financial Statement
                   Schedules. See following list of Financial Statements and
                   Financial Statement Schedules, on page 17 which is
                   incorporated herein by reference.

                3. Exhibits. See Exhibit Index included as the last page of this
                   report, which index is incorporated herein by reference.

(b)      Reports on Form 8-K.

         The Company filed a Report on Form 8-K dated July 23, 1999, related to
         the Company's acquisition of SeaMED Corporation on that date. This
         report was amended on October 4, 1999. The report incorporated by
         reference the following financial statements:

                1. Audited financial statements of SeaMED as of June 30, 1998
                   and 1997, and for each of the three fiscal years in the
                   period ended June 30, 1998;

                2. Unaudited interim period financial statements of SeaMED as of
                   March 31, 1999, and for the quarters and nine month periods
                   ended March 31, 1999 and 1998;

                3. Unaudited pro forma financial statements of the Company at
                   March 31, 1999, for each of the three fiscal years in the
                   period ended September 30, 1998 and for the six month periods
                   ended March 31, 1999 and 1998, in each case giving effect to
                   the SeaMED acquisition.

         Amendment No. 1 to the report added a supplemental Plexus unaudited
         condensed pro forma statement of income for the six months ended March
         31, 1999. The supplemental statement combined Plexus and SeaMED
         financial information using the methodology which Plexus subsequently
         used when it restated its financial statements for the acquisition,
         rather than a different method used in the previous pro forma
         statements. The Amendment also included certain unaudited summary
         financial information of SeaMED for the fiscal period ended June 30,
         1999.





                                      16
<PAGE>   18

                               PLEXUS CORP. 10-K
                        LIST OF FINANCIAL STATEMENTS AND
                          FINANCIAL STATEMENT SCHEDULE
                               SEPTEMBER 30, 1999


                                    CONTENTS

<TABLE>
<CAPTION>
                                                                                      Pages
                                                                                      -----

<S>                                                                                   <C>
Report of Independent Accountants                                                       18

Consolidated Financial Statements:

         Consolidated Statements of Operations for the three years ended
         September 30, 1999, 1998 and 1997                                              19

         Consolidated Balance Sheets as of September 30, 1999 and 1998                  20

         Consolidated Statements of Stockholders' Equity for the three years
         ended September 30, 1999, 1998 and 1997                                        21

         Consolidated Statements of Cash Flows for the three years ended
         September 30, 1999, 1998 and 1997                                              22

         Notes to Consolidated Financial Statements                               23 to 31


Financial Statement Schedules:

         Report of Independent Accountants                                              32

         Schedule II - Valuation and Qualifying Accounts                                33


Report of Ernst & Young, LLP, Independent Auditors (for SeaMED Corporation)             34
</TABLE>




                                      17
<PAGE>   19

REPORT OF INDEPENDENT ACCOUNTANTS

To the Shareholders and
   Board of Directors
   Plexus Corp.:

In our opinion, based on our audits and the report of other auditors, the
accompanying consolidated balance sheets and the related consolidated
statements of operations, of stockholders' equity and of cash flows present
fairly, in all material respects, the financial position of Plexus Corp. and
subsidiaries at September 30, 1999 and 1998 and the results of their operations
and their cash flows for each of the three years in the period ended September
30, 1999 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. The consolidated financial statements give retroactive effect to
the merger of SeaMED Corporation on July 23, 1999 in a transaction accounted
for as a pooling of interests, as described in notes 1 and 8 of notes to
consolidated financial statements. We did not audit the financial statements of
SeaMED Corporation, which statements reflect, after restatement for certain
adjustments as explained in note 8 of notes to consolidated financial
statements, total assets of $42.9 million as of June 30, 1998 and total
revenues of $70.0 million and $52.1 million for the years ended June 30, 1998
and 1997, respectively. Those statements were audited by other auditors whose
report thereon has been furnished to us, and our opinion expressed herein,
insofar as it relates to the amounts included for SeaMED Corporation is based
solely on the report of the other auditors. 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 and the report of
other auditors provide a reasonable basis for the opinion expressed above.



PricewaterhouseCoopers LLP
Milwaukee, Wisconsin
October 26, 1999




                                      18
<PAGE>   20

PLEXUS CORP. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF OPERATIONS
for the years ended September 30, 1999, 1998 and 1997
(in thousands, except per share data)

<TABLE>
<CAPTION>
                                                       1999           1998           1997
                                                    ----------     ----------     ----------

<S>                                                 <C>            <C>            <C>
Net sales                                           $  492,414     $  466,795     $  438,565
Cost of sales                                          426,005        406,648        387,333
                                                    ----------     ----------     ----------

            Gross profit                                66,409         60,147         51,232

Operating expenses:

    Selling and administrative expenses                 26,443         23,754         20,463
    Plant closing, relocation and severance                981             --             --
    Merger costs                                         4,557             --             --
                                                    ----------     ----------     ----------
                                                        31,981         23,754         20,463
                                                    ----------     ----------     ----------

            Operating income                            36,393         30,769
                                                                                      34,428

Other income (expense):
    Interest expense                                      (274)           (86)        (1,014)
    Miscellaneous                                        1,995            975          1,160
                                                    ----------     ----------     ----------

            Income before income taxes                  36,149         37,282         30,915


Income taxes                                            15,838         14,345         12,022
                                                    ----------     ----------     ----------

            Net income                              $   20,311     $   22,937     $   18,893
                                                    ==========     ==========     ==========


Earnings per share:
     Basic                                          $     1.17     $     1.36     $     1.21
                                                    ==========     ==========     ==========
     Diluted                                        $     1.10     $     1.27     $     1.08
                                                    ==========     ==========     ==========


Weighted average shares outstanding:
     Basic                                              17,323         16,844         15,366
     Diluted                                            18,510         18,098         17,558
</TABLE>



         The accompanying notes are an integral part of these consolidated
                             financial statements.





                                      19
<PAGE>   21

PLEXUS CORP. AND SUBSIDIARIES

CONSOLIDATED BALANCE SHEETS
as of September 30, 1999 and 1998
(in thousands except per share data)

<TABLE>
<CAPTION>
                                    ASSETS                                               1999            1998
                                                                                      ----------      ----------
<S>                                                                                   <C>             <C>
Current assets:
        Cash and cash equivalents                                                     $   15,906      $   24,106
        Short-term investments                                                            17,224           5,517
        Accounts receivable, net of allowance of $773 and $1,011, respectively            69,318          61,622
        Inventories                                                                       79,017          57,321
        Deferred income taxes                                                              6,370           5,077
        Prepaid expenses and other                                                         3,562           2,201
                                                                                      ----------      ----------

                       Total current assets                                              191,397         155,844

Property, plant and equipment, net                                                        35,868          26,517
Other                                                                                      2,371           1,993
                                                                                      ----------      ----------

                       Total assets                                                   $  229,636      $  184,354
                                                                                      ==========      ==========

                     LIABILITIES AND STOCKHOLDERS' EQUITY

Current liabilities:
        Current portion of long-term debt                                             $       10      $      672
        Accounts payable                                                                  55,928          41,272
        Customer deposits                                                                  8,650           6,635
        Accrued liabilities:
             Salaries and wages                                                            9,820           8,447
             Other                                                                         6,578           7,659
                                                                                      ----------      ----------

                       Total current liabilities                                          80,986          64,685

Long-term debt                                                                               142           2,587
Deferred income taxes                                                                        215             700
Other liabilities                                                                          1,890             519

Stockholders' equity:
    Preferred stock, $.01 par value, 5,000 shares authorized, none issued
        or outstanding                                                                        --              --
    Common stock, $.01 par value, 60,000 shares authorized,
        17,545 and 17,016 issued, respectively                                               175             170
    Additional paid-in capital                                                            51,425          42,478
    Note receivable, officer                                                                  --             (75)
    Retained earnings                                                                     94,803          73,795
    Treasury stock, at cost, 0 and 29 shares, respectively                                    --            (505)
                                                                                      ----------      ----------
                                                                                         146,403         115,863
                                                                                      ----------      ----------

                       Total liabilities and stockholders' equity                     $  229,636      $  184,354
                                                                                      ==========      ==========
</TABLE>





       The accompanying notes are an integral part of these consolidated
                             financial statements.



                                      20
<PAGE>   22

PLEXUS CORP. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
for the years ended September 30, 1999, 1998 and 1997
(in thousands)

<TABLE>
<CAPTION>
                                                     Common Stock     Additional     Note                     Treasury Stock
                                                 -------------------    Paid-In   Receivable   Retained    --------------------
                                                  Shares     Amount     Capital     Officer    Earnings     Shares      Amount
                                                 --------   --------  ----------  ----------   --------    --------    --------

<S>                                              <C>        <C>       <C>         <C>          <C>          <C>        <C>
Balances, October 1, 1996, as previously
     reported                                       6,501   $     65   $ 14,253    $     --    $ 33,699          --    $     --

Restatement for pooling of interests with
     SeaMED                                           134          1        886         (75)       (320)         --          --
                                                 --------   --------   --------    --------    --------    --------    --------

BALANCES AT OCTOBER 1, 1996, RESTATED               6,635         66     15,139         (75)     33,379          --          --
SeaMED initial public offering                        306          3     14,820          --          --          --          --
Exercise of stock options,
     including tax benefits                           372          3      3,999          --          --          --          --
Preferred stock dividends                              --         --     (1,765)         --        (338)         --          --
Plexus preferred stock conversion                      --
     (Series A)                                       554          6         (6)         --          --          --          --
SeaMED preferred stock conversion
     (Class A, B, C and D)                            587          6      5,274          --          --          --          --
Two-for-one common stock split                      8,391         84        (84)         --          --          --          --
Net income                                             --         --         --          --      18,893          --          --
                                                 --------   --------   --------    --------    --------    --------    --------

BALANCES, SEPTEMBER 30, 1997                       16,845        168     37,377         (75)     51,934          --          --
Treasury stock purchased                               --         --         --          --          --        (214)     (3,442)

Exercise of stock options,
     including tax benefits                           160          2      5,101          --      (1,024)        132       2,059
Common stock warrants issued                           11         --         --          --          --          --          --
Other treasury stock issuances                         --         --         --          --         (52)         53         878
Net income                                             --         --         --          --      22,937          --          --
                                                 --------   --------   --------    --------    --------    --------    --------

BALANCES, SEPTEMBER 30, 1998                       17,016        170     42,478         (75)     73,795         (29)       (505)
Effect of SeaMED excluded period                       --         --         16          --       1,271          --          --
Treasury stock purchased                               --         --         --          --          --         (32)     (1,160)
Exercise of stock options,
      including tax benefit                           529          5      8,931          --        (574)         61       1,665

Payment of note receivable officer                     --         --         --          75          --          --          --
Net income
                                                       --         --         --          --      20,311          --          --
                                                 --------   --------   --------    --------    --------    --------    --------

BALANCES, SEPTEMBER 30, 1999                     $ 17,545   $    175   $ 51,425    $     --    $ 94,803          --    $     --
                                                 ========   ========   ========    ========    ========    ========    ========
</TABLE>






       The accompanying notes are an integral part of these consolidated
                             financial statements.




                                      21
<PAGE>   23

PLEXUS CORP. AND SUBSIDIARIES

CONSOLIDATED STATEMENTS OF CASH FLOWS
for the years ended September 30, 1999, 1998 and 1997
(in thousands)

<TABLE>
<CAPTION>
                                                                   1999           1998           1997
                                                                ----------     ----------     ----------
<S>                                                             <C>            <C>            <C>
CASH FLOWS FROM OPERATING ACTIVITIES
   Net income                                                   $   20,311     $   22,937     $   18,893
   Adjustments to reconcile net income to net cash flows
         from operating activities:
      Depreciation and amortization                                  9,993          8,372          5,561
      Provision for inventories and accounts
         receivable allowances                                       3,330          4,092          4,911
      Deferred income taxes                                         (1,778)        (1,609)        (1,049)
      Non-operating gains                                               --             --           (620)
      Changes in assets and liabilities:
         Accounts receivable                                        (8,842)        (5,547)       (15,477)
         Inventories                                               (25,270)        (3,411)        (2,376)
         Prepaid expenses and other                                 (1,089)        (1,283)           230
         Accounts payable                                           15,569          3,690          7,136
         Customer deposits                                           1,838          2,466         (5,119)
         Accrued liabilities                                           869          1,207          6,318
         Other                                                         226         (1,071)           (61)
                                                                ----------     ----------     ----------
                 Cash flows provided by
                       operating activities                         15,157         29,843         18,347
                                                                ----------     ----------     ----------
CASH FLOWS FROM INVESTING ACTIVITIES
   Purchases of short-term investments                            (244,449)        (6,632)        (7,873)
   Sales and maturities of short-term investments                  232,742          7,319          1,669
   Payments for property, plant and equipment                      (18,196)       (11,997)       (13,488)
   Proceeds on sale of property, plant and equipment                   213            114            724
                                                                ----------     ----------     ----------
                 Cash flows used in
                       investing activities                        (29,690)       (11,196)       (18,968)
                                                                ----------     ----------     ----------
CASH FLOWS FROM FINANCING ACTIVITIES
   Proceeds from debt                                                   --          3,125         96,442
   Payments on debt                                                 (4,561)        (4,664)      (110,644)
   Proceeds from exercise of stock options,
      including tax benefit                                          8,936          4,217          3,555
   Issuances of common stock                                            --            671         15,212
   Treasury stock purchased                                         (1,160)        (3,442)            --
   Treasury stock reissued                                           1,091          1,861             --
   Payments of preferred stock dividends                                --             --         (2,103)
                                                                ----------     ----------     ----------
                 Cash flows provided by
                       financing activities                          4,306          1,768          2,462
                                                                ----------     ----------     ----------
Net increase (decrease) in cash and cash equivalents               (10,227)        20,415          1,841
Cash and cash equivalents, beginning of year                        24,106          3,691          1,850
Effect of SeaMED excluded period                                     2,027             --             --
                                                                ----------     ----------     ----------
Cash and cash equivalents, end of year                          $   15,906     $   24,106     $    3,691
                                                                ==========     ==========     ==========
</TABLE>




       The accompanying notes are an integral part of these consolidated
                             financial statements.




                                      22
<PAGE>   24

PLEXUS CORP. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

1.       DESCRIPTION OF BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES

         Description of Business: Plexus Corp. provides product realization
         services to original equipment manufacturers (OEMs) in the medical,
         computer (primarily mainframes, servers and peripherals), industrial,
         networking, telecommunications and transportation electronics
         industries. The Company offers a full range of services including
         product development and design services, material procurement and
         management, prototyping, manufacturing and assembly, functional and
         in-circuit testing, final system box build, distribution and
         after-market support.

         The contract manufacturing services are provided on either a turnkey
         basis, where the Company procures certain or all of the materials
         required for product assembly, or on a consignment basis, where the
         customer supplies materials necessary for product assembly. Turnkey
         services include material procurement and warehousing, in addition to
         manufacturing, and involve greater resource investment than
         consignment services. Turnkey manufacturing currently represents
         almost all of the Company's sales.

         Consolidation Principles: The consolidated financial statements
         include the accounts of Plexus Corp. and its subsidiaries (together
         "the Company"). All significant intercompany transactions have been
         eliminated.

         As described more fully in note 8 - "Merger and Acquisition," on July
         23, 1999, SeaMED Corporation ("SeaMED"), a public company, was merged
         into Plexus. The consolidated financial statements have been prepared
         following the pooling of interests method of accounting for the merger
         and therefore reflect the combined financial position, operating
         results and cash flows of the two companies for all periods presented.
         SeaMED had a June 30 fiscal year end. Prior to fiscal 1999, the
         combined financial statements reflect Plexus' September 30 financial
         position and results and SeaMED's June 30 financial position and
         results. For fiscal 1999, the combined financial statements reflect
         the October 1, 1998 through September 30, 1999 period for both
         companies. SeaMED's results of operations and cash flows from July 1,
         1998 to September 30, 1998, which have been excluded from these
         consolidated financial statements, are reflected as adjustments in the
         1999 consolidated statements of stockholders' equity and cash flows.
         Net sales and net income for SeaMED for the excluded period from July
         1, 1998 to September 30, 1998 were $19.4 million and $1.3 million,
         respectively.

         Cash Equivalents and Short-Term Investments: Cash equivalents are
         highly liquid investments purchased with an original maturity of less
         than three months. Short-term investments are investment-grade
         short-term debt instruments with original maturities greater than
         three months. Short-term investments are generally comprised of
         securities with contractual maturities greater than one year but with
         optional or early redemption provisions within one year.

         Investments in debt securities are classified as "available-for-sale."
         Such investments are recorded at fair value as determined from quoted
         market prices, and the cost of securities sold is determined on the
         specific identification method. If material, unrealized gains or
         losses are reported as a component of comprehensive income or losses,
         net of related tax effect. At September 30, 1999, 1998 and 1997, such
         unrealized gains and losses were not material. In addition, there were
         no realized gains or losses in fiscal 1999, 1998 and 1997.

         Short-term investments as of September 30, 1999 and 1998 consist of
(in thousands):

<TABLE>
<CAPTION>
                                                                      1999          1998
                                                                    --------      --------
<S>                                                                 <C>           <C>
                U.S. government and agency securities               $     --      $  5,517
                State and municipal securities                        13,675            --
                U.S. corporate and bank debt                           8,932            --
                Other                                                  2,000            --
                                                                    --------      --------
                                                                    $ 24,607      $  5,517
                                                                    ========      ========
</TABLE>

         Approximately $7.4 million and $0 of the total short-term investments
         as of September 30 1999 and 1998, respectively, are included in cash
         and cash equivalents.

         Inventories: Inventories are valued primarily at the lower of cost or
         market. Cost is determined by the first-in, first-out (FIFO) method.




                                      23
<PAGE>   25


PLEXUS CORP. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - CONTINUED

         Property, Plant and Equipment and Depreciation: These assets are
         stated at cost. Depreciation, determined on the straight-line method,
         is based on lives assigned to the major classes of depreciable assets
         as follows:

<TABLE>
<S>                                                           <C>
                           Buildings and improvements         18-40 years
                           Machinery and equipment            3-10 years
</TABLE>

         Revenue Recognition: Revenue is recognized primarily when products are
         shipped. Revenue and profit relating to product design and development
         contracts, which are short-term in duration, usually less than three
         months, are recognized as costs are incurred utilizing the
         percentage-of-completion method; any losses are recognized when
         anticipated. Revenue from design and development contracts is less
         than 10% of total revenue in fiscal 1999, 1998, and 1997. Progress
         towards completion of product design and development contracts is
         based on units of work for labor content and cost for component
         content.

         Income Taxes: Deferred income taxes are provided for differences
         between the bases of assets and liabilities for financial and tax
         reporting purposes.

         Earnings Per Share: The computation of basic earnings per common share
         is based upon the weighted average number of common shares outstanding
         and net income reduced for preferred stock dividends. The computation
         of diluted earnings per common share reflects additional dilution from
         stock options and convertible preferred shares using the if-converted
         method.

         New Accounting Pronouncements: In March 1998, the American Institute
         of Certified Public Accountants ("AICPA") issued Statement of Position
         ("SOP") 98-1, "Accounting for the Costs of Computer Software Developed
         or Obtained for Internal Use", which specifies the accounting
         treatment of computer software costs depending upon the type of costs
         incurred. This SOP is effective for the Company's fiscal year 2000
         financial statements and restatement of prior years will not be
         required. The Company does not believe the adoption of this SOP will
         have a significant impact on its financial position or results of
         operations.

         Use of Estimates: The preparation of financial statements in
         conformity with generally accepted accounting principles requires
         management to make estimates and assumptions that affect the amounts
         reported in the financial statements and accompanying notes. Actual
         results could differ from those estimates.

         Fair Value of Financial Instruments: Cash and cash equivalents,
         short-term investments, accounts receivable, accounts payable and
         accrued liabilities are reflected in the consolidated financial
         statements at cost because of the short-term duration of these
         instruments. The fair value of long-term debt closely approximates its
         carrying value. The Company uses quoted market prices, when available,
         or discounted cash flows to calculate these fair values.

         Business and Credit Concentrations: Financial instruments that
         potentially subject Plexus to concentrations of credit risk consist of
         cash, cash equivalents, short-term investments and trade accounts
         receivable. Plexus' cash, cash equivalents and short-term investments
         are managed by recognized financial institutions which follow the
         Company's investment policy. Such investment policy limits the amount
         of credit exposure in any one issue and the maturity date of the
         investment securities that typically comprise investment grade
         short-term debt instruments. Concentrations of credit risk in accounts
         receivable resulting from sales to major customers are discussed in
         Note 11. Plexus at times requires advanced cash deposits for sales.
         The Company also closely monitors extensions of credit and has not
         experienced significant credit losses in the past.

         Reclassifications: Certain amounts in prior years' consolidated
         financial statements have been reclassified to conform to the 1999
         presentation.

2.       INVENTORIES

         Inventories as of September 30, 1999 and 1998 consist of (in
         thousands):

<TABLE>
<CAPTION>
                                                        1999          1998
                                                      --------      --------
<S>                                                   <C>           <C>
                Assembly parts                        $ 40,616      $ 34,965
                Work-in-process                         27,145        21,306
                Finished goods                          11,256         1,050
                                                      --------      --------
                                                      $ 79,017      $ 57,321
                                                      ========      ========
</TABLE>



                                      24
<PAGE>   26


PLEXUS CORP. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - CONTINUED

3.       PROPERTY, PLANT AND EQUIPMENT

         Property, plant and equipment as of September 30, 1999 and 1998
         consist of (in thousands):

<TABLE>
<CAPTION>
                                                              1999          1998
                                                            --------      --------
<S>                                                         <C>           <C>
                Land, buildings and improvements            $ 12,009      $ 10,792
                Machinery and equipment                       68,021        51,965
                                                            --------      --------
                                                              80,030        62,757
                Less accumulated depreciation                 44,162        36,240
                                                            --------      --------
                                                            $ 35,868      $ 26,517
                                                            ========      ========
</TABLE>

4.       DEBT

         Long-term debt as of September 30, 1999 and 1998 consists of (in
         thousands):

<TABLE>
<CAPTION>
                                                                             1999          1998
                                                                           --------      --------
<S>                                                                        <C>           <C>
         Notes and obligations with a weighted
              average interest rate of 5.0% and 3.2%, respectively         $    152      $    266

         Unsecured subordinated note payable, paid in 1999                       --           493

         Variable rate note payable, collateralized by equipment,
             paid in 1999                                                        --         2,500
                                                                           --------      --------
                                                                                152         3,259

         Less current portion                                                    10           672
                                                                           --------      --------
                                                                           $    142      $  2,587
                                                                           ========      ========
</TABLE>


         Revolving Credit Agreement: The Company's revolving credit agreement
         provides for maximum borrowings of $40 million with all or a portion
         of the principal bearing interest at a LIBOR based or a prime based
         interest rate as elected by the Company. These rates are LIBOR plus
         0.875% and prime less 0.25%. The credit agreement is unsecured and a
         commitment fee of 0.125% per annum on the unused portion of this
         agreement is payable quarterly. The agreement matures in July 2003.
         The revolving credit agreement, as amended, includes covenants which
         require the maintenance of various debt to net worth ratios. There
         were no borrowings under this credit agreement at September 30, 1999.

         Variable Rate Note Payable: During fiscal 1998, the Company borrowed
         $2.5 million against a SeaMED equipment credit facility. Borrowings
         under this agreement bear interest at LIBOR plus 1.4%. At September
         30, 1998, the Company had an interest rate contract with a notional
         principal amount of $2.5 million that effectively converts the
         variable rate note payable to a fixed rate of 7.5%. This contract was
         terminated during 1999 in conjunction with the pay down of the related
         debt.

         Cash paid for interest in fiscal 1999, 1998 and 1997 was $274,000,
         $87,000, and $1.2 million, respectively.

5.       INCOME TAXES

         Income tax expense (benefit) for fiscal 1999, 1998 and 1997 consists
         of (in thousands):

<TABLE>
<CAPTION>
                                                 1999           1998           1997
                                               --------       --------       --------
<S>                                            <C>            <C>            <C>
         Currently payable:
             Federal                           $ 14,465       $ 13,710       $ 11,332
             State                                3,151          2,244          1,739
                                               --------       --------       --------
                                                 17,616         15,954         13,071
                                               --------       --------       --------
         Deferred:
             Federal                             (1,695)        (1,489)          (990)
             State                                  (83)          (120)           (59)
                                               --------       --------       --------
                                                 (1,778)        (1,609)        (1,049)
                                               --------       --------       --------

                                               $ 15,838       $ 14,345       $ 12,022
                                               ========       ========       ========
</TABLE>





                                      25
<PAGE>   27


PLEXUS CORP. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - CONTINUED

         Following is a reconciliation of the Federal statutory income tax rate
         to the effective tax rates reflected in the consolidated statements of
         operations for fiscal 1999, 1998 and 1997:

<TABLE>
<CAPTION>
                                                            1999         1998         1997
                                                           ------       ------       ------
<S>                                                        <C>          <C>          <C>
         Federal statutory income tax rate                   35.0%        34.0%        34.0%
         Increase (decrease) resulting from:
            State income taxes, net of Federal
                 income tax benefit                           5.7          3.9          3.7
            Non-deductible merger costs                       3.1           --           --
            Other, net                                         --          0.6          1.2
                                                           ------       ------       ------

            Effective income tax rate                        43.8%        38.5%        38.9%
                                                           ======       ======       ======
</TABLE>

         The components of the net deferred income tax asset as of September
         30, 1999 and 1998, consist of (in thousands):

<TABLE>
<CAPTION>
                                                       1999           1998
                                                     --------       --------
         Deferred tax assets:
<S>                                                  <C>            <C>
             Inventories                             $  3,455       $  2,448
             Accrued benefits                           1,331          1,450
             Loss carryforwards                           156            154
             Other                                      2,044          1,296
                                                     --------       --------

                                                        6,986          5,348
             Less valuation allowance                     (24)           (21)
                                                     --------       --------


                                                        6,962          5,327
         Deferred tax liabilities:
             Property, plant and equipment                807            950
                                                     --------       --------

         Net deferred income tax asset               $  6,155       $  4,377
                                                     ========       ========
</TABLE>


         The Company records a valuation allowance to reflect the estimated
         amount of deferred income tax assets which relate to income tax loss
         carryforwards that are not expected to be realized.

         Cash paid for income taxes in fiscal 1999, 1998 and 1997 was $16.3
         million, $13.0 million and $13.5 million, respectively.

6.       STOCKHOLDERS' EQUITY

         On December 19, 1997, the Company's Board of Directors authorized the
         repurchase of up to 2,000,000 shares, or a maximum of $25,000,000, of
         the Company's common stock on the open market. On March 16, 1999 the
         Plexus Corp. Board of Directors rescinded the Company's stock buyback
         program in contemplation of the merger with SeaMED.

         On July 17, 1997, the Company declared a two-for-one stock split
         payable in the form of a stock dividend of one share of common stock
         for every share of common stock outstanding. The new stock was issued
         on August 25, 1997 to holders of record as of August 14, 1997. Share
         and per share amounts, where required, have been restated to reflect
         this stock split.

         On February 28, 1997, the holders of the 7,000 shares of issued and
         outstanding Plexus Corp. Series A Preferred Shares converted all such
         shares, in accordance with their terms, into a total of 554,454
         (pre-split) shares of the Company's common stock. In November 1996,
         the Class A, B, C and D convertible redeemable preferred stock of
         SeaMED was converted into a total of 586,806 (pre-split) shares of the
         Company's common stock. Also issued was a warrant to purchase 15,626
         (pre-split) shares of common stock. The warrant was exercised in March
         1998 in a non-cash transaction which resulted in the issuance of
         11,158 shares.

         In November 1996, SeaMED completed an initial public offering of
         305,944 (pre-split) shares of common stock. Net proceeds were $14.8
         million (net of offering costs and underwriters discount of $2.0
         million). SeaMED used $1.8 million of the proceeds to pay previously
         undeclared cumulative dividends on its Class A and D convertible
         redeemable preferred stock.

         Income tax benefits attributable to stock options exercised are
         recorded as an increase in additional paid-in capital.



                                      26
<PAGE>   28


PLEXUS CORP. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - CONTINUED

7.       EARNINGS PER SHARE

         The following is a reconciliation of the amounts utilized in the
         computation of basic and diluted earnings per share (in thousands
         except per share amounts):

<TABLE>
<CAPTION>
                                                                            September 30,
                                                                 ------------------------------------
                                                                   1999          1998          1997
                                                                 --------      --------      --------
<S>                                                              <C>           <C>           <C>
         BASIC EARNINGS PER SHARE:
             Net income                                          $ 20,311      $ 22,937      $ 18,893
             Less:  Preferred stock dividends                          --            --           312
                                                                 --------      --------      --------
             Income available to common                          $ 20,311      $ 22,937      $ 18,581
                stockholders                                     ========      ========      ========

             Basic weighted average shares outstanding             17,323        16,844        15,366
                                                                 ========      ========      ========

         BASIC EARNINGS PER SHARE                                $   1.17      $   1.36      $   1.21
                                                                 ========      ========      ========


         DILUTED EARNINGS PER SHARE:
             Net income                                          $ 20,311      $ 22,937      $ 18,893
                                                                 ========      ========      ========

             Weighted average shares outstanding                   17,323        16,844        15,366
               Effect of dilutive securities:
                 Stock options                                      1,187         1,245         1,269
                 Stock warrants                                        --             9             9
                 Convertible preferred stock                           --            --           914
                                                                 --------      --------      --------
             Diluted weighted average shares outstanding           18,510        18,098        17,558
                                                                 ========      ========      ========

         DILUTED EARNINGS PER SHARE                              $   1.10      $   1.27      $   1.08
                                                                 ========      ========      ========
</TABLE>

8.       MERGER AND ACQUISITION

         Merger: In July 1999, Plexus acquired SeaMED. Pursuant to the merger
         agreement, SeaMED stockholders received 0.40 of a share of Plexus
         common stock for each share of SeaMED common stock. Plexus issued
         approximately 2.27 million shares of its common stock in exchange for
         all outstanding common stock of SeaMED. SeaMED stock options
         outstanding, as of the merger date, were exchanged for options to
         acquire approximately 171,764 shares of Plexus common stock at the
         same time. SeaMED is a provider of engineering and manufacturing
         services, coupled with regulatory expertise, of advanced medical
         instruments for medical technology companies. All merger costs and
         other one-time expenses related to the SeaMED merger have been
         expensed as required under the pooling of interests method of
         accounting. Certain merger-related costs, which included charges
         related to obsolete inventories and a loss on an engineering contract,
         have been included in cost of sales in the consolidated statement of
         operations. All such costs and expenses amounted to $6.0 million after
         income taxes in fiscal 1999 and are reflected in the financial
         statements as follows (in thousands):

<TABLE>
<S>                                                            <C>
         Cost of sales                                         $  2,177
         Plant closing, relocation and severance                    981
         Merger costs                                             4,557
                                                               --------
                                                                  7,715
         Less: income tax benefit                                 1,684
                                                               --------
         Net merger and other one-time charges                 $  6,031
                                                               ========
</TABLE>





                                      27
<PAGE>   29


PLEXUS CORP. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - CONTINUED

         The results of operations previously reported by the separate
         companies and the combined amounts presented in the accompanying
         consolidated financial statements are reconciled below (in thousands):

<TABLE>
<CAPTION>
                                                    Nine months ended          September 30,
                                                      June 30, 1999        1998             1997
                                                    -----------------------------------------------
                                                       (unaudited)
         Net sales:
<S>                                                 <C>                 <C>              <C>
            Plexus                                     $  310,717       $  396,815       $  386,431
            SeaMED                                         49,463           69,980           52,134
                                                       ----------       ----------       ----------

            Combined                                   $  360,180       $  466,795       $  438,565
                                                       ==========       ==========       ==========

         Net income:
            Plexus                                     $   18,228       $   19,235       $   16,400
                                                       ----------       ----------       ----------
            SeaMED:
              As previously reported                       (1,813)           4,139            2,726
              Conforming accounting adjustments               401             (437)            (233)
                                                       ----------       ----------       ----------
                Restated                                   (1,412)           3,702            2,493
                                                       ----------       ----------       ----------
                Restated                               $   16,816       $   22,937       $   18,893
                                                       ==========       ==========       ==========
</TABLE>

         The adjustments above conform SeaMED's method of accounting for
         inventory with that of Plexus, net of related tax effect.

         Acquisition: On September 1, 1999, Plexus Corp. purchased certain
         printed circuit board assembly manufacturing assets from an unrelated
         party. The manufacturing assets which consisted principally of
         equipment and inventories were purchased at approximately fair market
         value. The Company also leases a portion of a manufacturing facility
         owned by the unrelated party which houses the printed circuit board
         operations. The Company has agreed to acquire certain other assets
         from the same unrelated party in fiscal 2000. The total purchase price
         of the net assets acquired in fiscal 1999 and to be acquired in fiscal
         2000 is not material to the assets or stockholders' equity of the
         Company. Pro forma statements of operations for fiscal 1999 and 1998
         reflecting this acquisition are not shown as they would not differ
         materially from the reported results.

9.       LEASE COMMITMENTS

         The Company has a number of operating lease agreements primarily
         involving manufacturing facilities, manufacturing equipment and
         computerized design equipment. These leases are non-cancelable and
         expire on various dates through 2014. Rent expense under all operating
         leases for fiscal 1999, 1998 and 1997 was approximately $11.3 million,
         $10.2 million and $11.5 million, respectively. Renewal and purchase
         options are available on certain of these leases. The sale of
         equipment obtained through the exercise of the purchase option on
         certain leases resulted in miscellaneous income of $620,000 in fiscal
         1997.

         In April 1997, the Company began leasing a new 110,000-square-foot
         manufacturing facility located in Green Bay, Wisconsin. The facility
         was constructed and equipped by Oneida Nation Electronics (ONE), a
         corporation chartered by the Oneida Tribe of Indians of Wisconsin. All
         lease payments for the building and equipment are based on the
         profitability of the facility pursuant to a formula defined in the
         lease agreement. There are no required minimum lease payments.

         Future minimum annual payments on operating leases are as follows (in
         thousands):

<TABLE>
<S>                                             <C>
                                2000            $ 8,437
                                2001              5,632
                                2002              5,037
                                2003              5,001
                                2004              4,823
                                Thereafter       19,702
                                                -------
                                                $48,632
                                                =======
</TABLE>






                                      28
<PAGE>   30


PLEXUS CORP. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - CONTINUED

10.      BENEFIT PLANS

         401(k) Savings Plans: The Company's 401(k) savings plans cover
         substantially all eligible employees. The Company matches employee
         contributions, based on years of service, up to 2.5% of eligible
         earnings. The Company's contributions for fiscal 1999, 1998 and 1997
         totaled $1.6 million, $1.4 million and $1.2 million, respectively.

         Stock Option Plans: The Company has reserved 6.0 million shares of
         common stock for grant to officers and key employees under an employee
         stock option plan, of which 4.1 million shares have been granted. The
         exercise price of each option granted shall not be less than the fair
         market value on the date of grant and options vest over a three year
         period from date of grant. The plan also authorizes the Company to
         grant 600,000 stock appreciation rights, none of which have been
         granted.

         In connection with the SeaMED merger occurring in fiscal 1999 (see
         note 8 - "Merger and Acquisition"), all of the options outstanding
         under the former SeaMED stock option plans were assumed by the Company
         and converted into options to purchase shares of the Company's Common
         Stock on terms adjusted to reflect the Merger exchange ratio. Options
         to acquire a total of 429,410 SeaMED shares were converted into
         options to acquire a total of 171,764 Plexus shares. The SeaMED stock
         option plans are similar to the Plexus plans above and options vest
         over a four year period from date of grant. These plans have been
         terminated; however, the outstanding options, as so adjusted, retain
         all of the rights, terms and conditions of the respective plans under
         which they were originally granted until their expiration.

         Under a separate plan, each independent outside director is granted
         1,500 stock options each December 1, with option pricing similar to
         the employee plans. These options are fully vested upon grant and can
         be exercised after a minimum six-month holding period. The 200,000
         shares of common stock authorized under this plan may come from any
         combination of authorized but unissued shares, treasury stock or the
         open market.

          A summary of the stock option activity follows:

<TABLE>
<CAPTION>
                                                                SHARES       WEIGHTED AVERAGE
                                                            (IN THOUSANDS)    EXERCISE PRICE
                                                            --------------   ----------------
<S>                                                          <C>             <C>
         Options outstanding at October 1, 1996                     2,239       $     6.13

         Granted                                                      698       $    13.84
         Canceled                                                     (34)      $     6.69
         Exercised                                                   (667)      $     5.35
                                                               ----------
         OPTIONS OUTSTANDING AT SEPTEMBER 30, 1997                  2,236       $     8.76

         Granted                                                      406       $    23.60
         Canceled                                                     (43)      $    12.26
         Exercised                                                   (281)      $     6.15
                                                               ----------
         OPTIONS OUTSTANDING AT SEPTEMBER 30, 1998                  2,318       $    11.62

         Effect of SeaMED excluded period                              31       $    46.69
         Granted                                                      490       $    30.58
         Canceled                                                     (82)      $    32.42
         Exercised                                                   (546)      $     7.61
                                                               ----------
         OPTIONS OUTSTANDING AT SEPTEMBER 30, 1999                  2,211       $    16.52
                                                               ==========

         OPTIONS EXERCISABLE AT:
                  SEPTEMBER 30, 1997                                  957       $     6.02
                                                               ==========       ==========
                  SEPTEMBER 30, 1998                                1,250       $     7.40
                                                               ==========       ==========
                  SEPTEMBER 30, 1999                                1,259       $    10.42
                                                               ==========       ==========
</TABLE>





                                      29
<PAGE>   31


PLEXUS CORP. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - CONTINUED

         The following table summarizes outstanding stock option information at
September 30, 1999 (shares in thousands):

<TABLE>
<CAPTION>
                                                                                                              Weighted
           Range of           Number         Weighted Average      Weighted Average          Number            Average
       Exercise Prices     Outstanding       Exercise Price        Remaining Life          Exercisable      Exercise Price
      ----------------     -----------       ----------------      ----------------        -----------      --------------
<S>                        <C>                <C>                   <C>                    <C>               <C>
       $ 1.25 - $ 7.50          704             $ 6.14                5.6 years                  700            $ 6.14
       $ 8.30 - $12.50          605             $11.81                6.8 years                  397            $11.55
       $18.50 - $29.00          365             $21.33                8.3 years                  121            $21.38
       $29.50 - $45.00          537             $32.17                8.8 years                   41            $40.29

       $ 1.25 - $45.00        2,211             $16.52                7.2 YEARS                1,259            $10.42
</TABLE>

         The Company has elected to account for its stock option plans under
         the guidelines of Accounting Principles Board Opinion No. 25.
         Accordingly, no compensation cost related to the stock option plans
         has been recognized in the consolidated statements of operations. Had
         the Company recognized compensation expense based on the fair value at
         the grant date for awards under the plans, the Company's net income
         for fiscal 1999, 1998 and 1997 would have been reduced by
         approximately $2.8 million, $2.9 million and $1.5 million,
         respectively. Basic earnings per share would have been reduced by
         $0.16, $0.17 and $0.10 in fiscal 1999, 1998 and 1997, respectively.
         These pro forma results will not be representative of the impact in
         future years because only grants made since October 1, 1995 were
         considered.

         The weighted average fair value of options granted per share during
         fiscal 1999, 1998 and 1997 is $16.82, $13.21, $6.62, respectively. The
         fair value of each option grant is estimated at the date of grant
         using the Black-Scholes prorated straight line option-pricing method
         with the following assumption ranges: 45% to 61% volatility, risk free
         interest rates ranging from 4.1% to 6.6%, expected option life of 4.5
         to 6.0 years, and no expected dividends.

         Deferred Compensation Plan: In September 1996, the Company entered
         into agreements with certain of its officers under a nonqualified
         deferred compensation plan. Under the plan, the Company has agreed to
         pay certain amounts annually for the first 15 years subsequent to
         retirement or to a designated beneficiary upon death. It is
         management's intent that life insurance contracts owned by the Company
         will fund this plan. Expense for this plan totaled $361,000, $343,000
         and $315,000 in fiscal 1999, 1998, and 1997, respectively.

         Other: The Company is not obligated to provide any post-retirement
         medical or life insurance benefits to employees.

11.      BUSINESS SEGMENT AND MAJOR CUSTOMERS

         The Company adopted Statement of Financial Accounting Standards
         ("SFAS") No. 131, "Disclosure about Segments of an Enterprise and
         Related Information" in fiscal 1999. SFAS No. 131 establishes
         standards for the way public business enterprises are to report
         information about operating segments in annual financial reports
         issued to shareholders. It also establishes standards for related
         disclosures about products and services, geographic area and major
         customers.

         The Company and its subsidiaries operate in one business segment, the
         production and sale of electronic products including the designing,
         manufacturing, programming and testing of computerized electronic
         assemblies. Additionally all of the Company's operations are located
         in the United States.

         The following table summarizes the percentage of net sales to
         customers that account for more than 10% of net sales in fiscal 1999,
         1998 and 1997:

<TABLE>
<CAPTION>
                                                                 1999         1998         1997
                                                               --------     --------     --------
<S>                                                            <C>          <C>          <C>
             Lucent Technologies Inc.                               16%          *            *
             General Electric Company                               12%          *           11%
             International Business Machines Corporation             *           *           10%
</TABLE>

                       (* represents sales less than 10%)

         Accounts receivable related to Lucent and General Electric represent
         14% and 7%, respectively, of the Company's trade accounts receivable
         as of September 30, 1999.





                                      30
<PAGE>   32


PLEXUS CORP. AND SUBSIDIARIES
NOTES TO CONSOLIDATED FINANCIAL STATEMENTS - CONTINUED

12.      QUARTERLY FINANCIAL DATA (UNAUDITED)

         Summarized quarterly financial data for fiscal 1999 and 1998 consists
         of (in thousands, except per share amounts):

<TABLE>
<CAPTION>
                                         First        Second         Third        Fourth
                  1999                  Quarter       Quarter       Quarter       Quarter       Total
         ------------------------      --------      --------      --------      --------      --------
<S>                                    <C>           <C>           <C>           <C>           <C>
         Net sales                     $120,585      $119,165      $120,430      $132,234      $492,414
         Gross profit                    16,904        16,828        13,714        18,963        66,409
         Net income                       6,825         6,265         3,726         3,495        20,311
         Earnings per share
              Basic                    $   0.40      $   0.36      $   0.21      $   0.20      $   1.17
              Diluted                  $   0.37      $   0.34      $   0.20      $   0.19      $   1.10
</TABLE>

<TABLE>
<CAPTION>
                                         First        Second         Third        Fourth
                  1998                  Quarter       Quarter       Quarter       Quarter       Total
         ------------------------      --------      --------      --------      --------      --------

<S>                                    <C>           <C>           <C>           <C>           <C>
         Net sales                     $111,935      $113,948      $116,827      $124,085      $466,795
         Gross profit                    12,426        14,104        15,870        17,747        60,147
         Net income                       4,462         5,128         6,207         7,140        22,937
         Earnings per share
              Basic                    $   0.26      $   0.30      $   0.37      $   0.42      $   1.36
              Diluted                  $   0.24      $   0.29      $   0.34      $   0.40      $   1.27
</TABLE>

         Earnings per share is computed independently for each quarter. The
         annual per share amount may not equal the sum of the quarterly amounts
         due to rounding.





                                      31
<PAGE>   33


REPORT OF INDEPENDENT ACCOUNTANTS
To the Shareholders and
   Board of Directors
   Plexus Corp.:

Our audits of the consolidated financial statements of Plexus Corp. and
subsidiaries referred to in our report dated October 26, 1999 (which is
included on page 18 of the Form 10-K) also included an audit of the financial
schedules listed in the index on page 17 of this Form 10-K. In our opinion,
these financial statement schedules present fairly, in all material respects,
the information set forth therein when read in conjunction with the related
consolidated financial statements.


PricewaterhouseCoopers LLP
Milwaukee, Wisconsin
October 26, 1999






                                      32
<PAGE>   34

PLEXUS CORP. AND SUBSIDIARIES
SCHEDULE II - VALUATION AND QUALIFYING ACCOUNTS

For the years ended September 30, 1999, 1998 and 1997
(in thousands)

<TABLE>
<CAPTION>
                                                            BALANCE AT        ADDITIONS
                                                           BEGINNING OF   CHARGED TO COSTS              BALANCE AT END
                   DESCRIPTIONS                               PERIOD        AND EXPENSES    DEDUCTIONS    OF PERIOD
- ----------------------------------------------------------------------------------------------------------------------

<S>                                                        <C>            <C>               <C>         <C>
1999:
Allowance for losses on accounts receivable
     (deducted from the asset to which it relates)            $    993(1)      $    319      $    539      $    773

Allowance for inventory obsolescence (deducted
     from the asset to which it relates)
                                                                 5,685(1)         3,011         1,836         6,860

                                                              --------         --------      --------      --------
                                                              $  6,678         $  3,330      $  2,375      $  7,633
                                                              ========         ========      ========      ========


1998:
Allowance for losses on accounts receivable
     (deducted from the asset to which it relates)
                                                              $    738         $    454      $    181      $  1,011

Allowance for inventory obsolescence
     (deducted from the asset to which it relates)               4,495            3,638         2,567         5,566

                                                              --------         --------      --------      --------
                                                              $  5,233         $  4,092      $  2,748      $  6,577
                                                              ========         ========      ========      ========


1997:
Allowance for losses on accounts receivable
     (deducted from the asset to which it relates)
                                                              $    527         $    227      $     16      $    738

Allowance for inventory obsolescence
     (deducted from the asset to which it relates)               1,864            4,684         2,053         4,495

                                                              --------         --------      --------      --------
                                                              $  2,391         $  4,911      $  2,069      $  5,233
                                                              ========         ========      ========      ========
</TABLE>


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

(1)  These balances do not agree to the prior year-end balances as they include
     the effects of the SeaMED Corporation excluded period (see Note 1 to Notes
     to Consolidated Financial Statements). The net effect of the SeaMED
     excluded period on allowance for losses on accounts receivable and
     inventory obsolescence was ($18,000) and $119,000, respectively.



                                      33
<PAGE>   35

               REPORT OF ERNST & YOUNG LLP, INDEPENDENT AUDITORS

Board of Directors SeaMED Corporation

We have audited the balance sheet of SeaMED Corporation as of June 30, 1998 and
the related statements of income, shareholders' equity, and cash flows for each
of the two years in the period ended June 30, 1998 (not presented separately
herein). These financial statements and related schedules are the
responsibility of the Company's management. Our responsibility is to express an
opinion on these financial statements and schedules based on our audits.

We conducted our audits in accordance with generally accepted auditing
standards. Those standards require that we plan and perform the audit to obtain
reasonable assurance about whether the financial statements are free of
material misstatements. An audit includes examining, on a test basis, evidence
supporting the amounts and disclosures in the financial statements. An audit
also includes assessing the accounting principles used and significant
estimates made by management, as well as evaluating the overall financial
statement presentation. We believe that our audits provide a reasonable basis
for our opinion.

In our opinion, the financial statements and schedules referred to above
present fairly, in all material respects, the financial position of SeaMED
Corporation as of June 30, 1998 and the results of its operations and its cash
flows for each of the two years in the period ended June 30, 1998, in
conformity with generally accepted accounting principals.



                                                 ERNST & YOUNG LLP

Seattle, Washington
August 13, 1998



                                      34
<PAGE>   36

                                   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.


By:      PLEXUS CORP. (Registrant)

         /s/ Peter Strandwitz
         --------------------
         Peter Strandwitz, Chairman

December 22, 1999

                               POWER OF ATTORNEY

         KNOW ALL MEN BY THESE PRESENTS, that each person whose signature
appears below constitutes and appoints Peter Strandwitz, John L. Nussbaum and
Joseph D. Kaufman, and each of them, his true and lawful attorneys-in-fact and
agents, with full power of substitution and resubstitution, for him and in his
name, place and stead, in any and all capacities, to sign any and all
amendments to this report, and to file the same will all exhibits thereto, and
other documents in connection therewith, with the Securities and Exchange
Commission, and any other regulatory authority, granting unto said
attorneys-in-fact and agents, and each of them, full power and authority to do
and perform each and every act and thing requisite and necessary to be done in
and about the premises, as fully to all intents and purposes as he might or
could do in person, hereby ratifying and confirming all that said
attorneys-in-fact and agents or any of them, or their substitutes, may lawfully
do or cause to be done by virtue hereof.

         Pursuant to the requirement of the Security Exchange Act of 1934, this
report has been signed by the following persons on behalf of the registrant and
in the capacities and on the date indicated.*

                              SIGNATURE AND TITLE

<TABLE>
<S>                                                                 <C>
                   /s/ Peter Strandwitz                                             /s/ David J. Drury
- ------------------------------------------------------------         --------------------------------------------------
  Peter Strandwitz, Chairman and Chief Executive Officer,                        David J. Drury, Director
                       and Director

                   /s/ John L. Nussbaum                                            /s/ Harold R. Miller
- ------------------------------------------------------------         --------------------------------------------------
 John L. Nussbaum, President and Chief Operating Officer,                       Harold R. Miller, Director
                       and Director

                    /s/ Thomas B. Sabol                                            /s/ Gerald A. Pitner
- ------------------------------------------------------------         --------------------------------------------------
     Thomas B. Sabol, Vice President-Finance and Chief                          Gerald A. Pitner, Director
                     Financial Officer

                    /s/ Lisa M. Kelley                                             /s/ Thomas J. Prosser
- ------------------------------------------------------------         --------------------------------------------------
  Lisa M. Kelley, Treasurer and Chief Accounting Officer                        Thomas J. Prosser, Director

                                                                                     /s/ Jan Ver Hagen
                                                                     --------------------------------------------------
                                                                                  Jan Ver Hagen, Director
</TABLE>


*  Each of the above signatures is affixed as of December 22, 1999.





                                      35
<PAGE>   37

                                 EXHIBIT INDEX
                                  PLEXUS CORP.
                     10-K FOR YEAR ENDED SEPTEMBER 30, 1999

<TABLE>
<CAPTION>
                                                                              INCORPORATED BY                 FILED
     EXHIBIT NO.                         EXHIBIT                               REFERENCE TO                 HEREWITH
     -----------                         -------                              ---------------               --------

<S>                      <C>                                        <C>                                     <C>
         3(i)            Restated Articles of Plexus Corp., as      Exhibit 3(i) to Plexus' Report on
                         amended through August 13, 1998            Form 10-K for the year ended
                                                                    September 30, 1998 ("1998 10-K")

        3(ii)            Bylaws of Plexus Corp., as amended         Exhibit 3(ii) to Plexus' Report on
                         through November 14, 1996                  Form 10-K for the year ended
                                                                    September 30, 1996 ("1996 10-K")

         4.1             Restated Articles of Incorporation of      Exhibit 3(i) above
                         Plexus Corp.

         4.2             Shareholder Rights Agreement, dated as     Exhibit 4.1 to Plexus' Report on
                         of August 13, 1998 between Plexus and      Form 8-K dated August 13, 1998 (the
                         Firstar Trust Company as Rights Agent      "8/13/98 8-K")

         4.3             Form of Rights Certificate                 Exhibit 4.2 to 8/13/98 8-K

         10.1            Supplemental Executive Retirement
                         Agreements dated as of September 19,
                         1996**

                              (a) Peter Strandwitz                  Exhibit 10.1(a) to 1996 10-K

                              (b) John Nussbaum                     Exhibit 10.1(b) to 1996 10-K

                              (c) Gerald Pitner                     Exhibit 10.1(c) to Plexus'
                                                                    Report on Form 10-K for the
                                                                    year ended September 30, 1997
                                                                    ("1997 10-K")



         10.2            Change of Control Agreements dated
                         August 1, 1998 with **

                         (a)  Peter Strandwitz                      Exhibit 10.2(a) to 1998 10-K
                              John L. Nussbaum
                              Thomas B. Sabol
                              Charles C. Williams
                              Joseph D. Kaufman
                              Dean A. Foate
                              J. Robert Kronser

                         (b)  Lisa M. Kelley                        Exhibit 10.2(b) to 1998 10-K

         10.3            Employee Savings Plan and Trust**:

         (a)             Plan Document                              Exhibit 10.3(a) to 1996 10-K

         (b)             Non-Standardized Form Adoption Agreement   Exhibit 10.3(b) to 1996 10-K
</TABLE>




                                      36
<PAGE>   38

<TABLE>
<S>                      <C>                                        <C>                                     <C>
         10.4            Plexus Corp. 1998 Option Plan**            Exhibit A to the Registrant's
                                                                    definitive proxy statement for its
                                                                    1998 Annual Meeting of Shareholders

        10.5(a)          Credit Agreement dated as of March 20,     Exhibit 10.5(a) to 1997 10-K
                         1997 among Firstar Bank Milwaukee,
                         National Association, Harris Trust and
                         Savings Bank, and Bank One, Wisconsin
                         (the "Credit Agreement")*

            (b)          Corporate Guarantee Agreements related     Exhibits 10.5(b)(i) and (ii) to
                         thereto dated as of March 20, 1997 by      1997 10-K
                         Electronic Assembly Corporation ("EAC")
                         and Technology Group, Inc.

        10.6(a)          Lease Agreement between Neenah (WI) QRS    Exhibit 10.8(a) to Plexus' Report
                         11-31, Inc. ("QRS: 11-31") and EAC,        on Form 10-K for the year ended
                         dated August 11, 1994*                     September 30, 1994 ("1994 10-K")

            (b)          Guaranty and Suretyship Agreement          Exhibit 10.8(c) to 1994 10-K
                         between Plexus Corp. and QRS: 11-31
                         dated August 11, 1994, together with
                         related Guarantor's Certificate of
                         Plexus Corp.

         10.7            Plexus Corp. 1995 Directors' Stock         Exhibit 10.10 to 1994 10-K
                         Option Plan**

         10.8            Plexus Corp. 1998 Management Incentive     Exhibit 10.10 to 1997 10-K
                         Compensation Plan**

         10.9            Lease Agreement dated February 12, 1996    Exhibit 10.16 to Plexus' Quarterly
                         between Plexus and Oneida Nation           Report on Form 10-Q for the quarter
                         Electronics                                ended March 31, 1996

        10.10            Agreement and Plan of Merger between       Exhibit 2.1 to Plexus' Quarterly
                         Plexus Corp. and SeaMED Corporation and    Report on Form 10-Q for the quarter
                         PS Acquisition Corp. dated as of March     ended March 31, 1999
                         16, 1999

          21             List of Subsidiaries                                                                   X

          23             Consent of PricewaterhouseCoopers LLP                                                  X

          24             Power of Attorney                                                         (Signature Page
                                                                                                         Hereto)

          27             Financial Data Schedules                                                               X
</TABLE>

- ----------------------
*    Excludes certain schedules and/or exhibits, which will be furnished to the
     Commission upon request.
**   Designates management compensatory plans or agreements.




                                      37

<PAGE>   1

EXHIBIT 21
PLEXUS 1999 10-K


                          SUBSIDIARIES OF PLEXUS CORP.



1.       Electronic Assembly Corporation, a Wisconsin corporation

2.       Technology Group Inc., a Wisconsin corporation

3.       SeaMED Corporation, a Washington corporation



<PAGE>   1





PLEXUS 1999 10-K
CONSENT OF INDEPENDENT ACCOUNTANTS


We consent to the incorporation by reference in the Registration Statements of
Plexus Corp. and subsidiaries on Form S-8 (File No.'s 333-06469, 333-76245,
333-84583, 33-23490, 33-28309, 33-56932, 33-89862 and 33-89864) and on Form S-3
(File No. 333-880957) of Plexus Corp. and subsidiaries of our reports dated
October 26, 1999 relating to the consolidated financial statements and the
financial statement schedules which appear in this Form 10-K.





PricewaterhouseCoopers LLP
Milwaukee, Wisconsin
December 22, 1999

<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          SEP-30-1999
<PERIOD-START>                             OCT-01-1998
<PERIOD-END>                               SEP-30-1999
<CASH>                                          15,906
<SECURITIES>                                    17,224
<RECEIVABLES>                                   70,091
<ALLOWANCES>                                       773
<INVENTORY>                                     79,017
<CURRENT-ASSETS>                               191,397
<PP&E>                                          80,030
<DEPRECIATION>                                  44,162
<TOTAL-ASSETS>                                 229,636
<CURRENT-LIABILITIES>                           80,986
<BONDS>                                              0
                                0
                                          0
<COMMON>                                           175
<OTHER-SE>                                     146,228
<TOTAL-LIABILITY-AND-EQUITY>                   229,636
<SALES>                                        492,414
<TOTAL-REVENUES>                               492,414
<CGS>                                          426,005
<TOTAL-COSTS>                                  426,005
<OTHER-EXPENSES>                                29,986
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                 274
<INCOME-PRETAX>                                 36,149
<INCOME-TAX>                                    15,838
<INCOME-CONTINUING>                             20,311
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    20,311
<EPS-BASIC>                                       1.17
<EPS-DILUTED>                                     1.10


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          SEP-30-1998
<PERIOD-START>                             OCT-01-1997
<PERIOD-END>                               SEP-30-1998
<CASH>                                          24,106
<SECURITIES>                                     5,517
<RECEIVABLES>                                   62,633
<ALLOWANCES>                                     1,011
<INVENTORY>                                     57,321
<CURRENT-ASSETS>                               155,844
<PP&E>                                          62,757
<DEPRECIATION>                                  36,240
<TOTAL-ASSETS>                                 184,354
<CURRENT-LIABILITIES>                           64,685
<BONDS>                                              0
                                0
                                          0
<COMMON>                                           170
<OTHER-SE>                                     115,693
<TOTAL-LIABILITY-AND-EQUITY>                   184,354
<SALES>                                        466,795
<TOTAL-REVENUES>                               466,795
<CGS>                                          406,648
<TOTAL-COSTS>                                  406,648
<OTHER-EXPENSES>                                22,779
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                                  86
<INCOME-PRETAX>                                 37,282
<INCOME-TAX>                                    14,345
<INCOME-CONTINUING>                             22,937
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    22,937
<EPS-BASIC>                                       1.36
<EPS-DILUTED>                                     1.27


</TABLE>

<TABLE> <S> <C>

<ARTICLE> 5
<MULTIPLIER> 1,000

<S>                             <C>
<PERIOD-TYPE>                   YEAR
<FISCAL-YEAR-END>                          SEP-30-1997
<PERIOD-START>                             OCT-01-1996
<PERIOD-END>                               SEP-30-1997
<CASH>                                           3,691
<SECURITIES>                                     6,204
<RECEIVABLES>                                   57,181
<ALLOWANCES>                                       738
<INVENTORY>                                     57,634
<CURRENT-ASSETS>                               128,887
<PP&E>                                          50,950
<DEPRECIATION>                                  27,931
<TOTAL-ASSETS>                                 152,453
<CURRENT-LIABILITIES>                           58,343
<BONDS>                                              0
                                0
                                          0
<COMMON>                                           168
<OTHER-SE>                                      89,236
<TOTAL-LIABILITY-AND-EQUITY>                   152,453
<SALES>                                        438,565
<TOTAL-REVENUES>                               438,565
<CGS>                                          387,333
<TOTAL-COSTS>                                  387,333
<OTHER-EXPENSES>                                19,303
<LOSS-PROVISION>                                     0
<INTEREST-EXPENSE>                               1,014
<INCOME-PRETAX>                                 30,915
<INCOME-TAX>                                    12,022
<INCOME-CONTINUING>                             18,893
<DISCONTINUED>                                       0
<EXTRAORDINARY>                                      0
<CHANGES>                                            0
<NET-INCOME>                                    18,893
<EPS-BASIC>                                       1.21
<EPS-DILUTED>                                     1.08


</TABLE>


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