OSI SYSTEMS INC
424A, 1997-09-02
SEMICONDUCTORS & RELATED DEVICES
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<PAGE>
                     
                                                  FILED PURSUANT TO RULE 424(a)
                                                     REGISTRATION NO. 333-29179
 
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A         +
+REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE   +
+SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY  +
+OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT        +
+BECOMES EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR   +
+THE SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE      +
+SECURITIES IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE    +
+UNLAWFUL PRIOR TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF  +
+ANY SUCH STATE.                                                               +
++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

                  SUBJECT TO COMPLETION, DATED AUGUST 27, 1997
 
                                      
                           [LOGO OF OPTO-SENSORS, INC.]
                                     
 
                                3,700,000 SHARES
 
                                  COMMON STOCK
 
  Of the 3,700,000 shares of Common Stock offered hereby, 3,330,000 shares are
being sold by OSI Systems, Inc. (the "Company") and 370,000 shares are being
sold by the Selling Shareholders. See "Principal and Selling Shareholders." The
Company will not receive any of the proceeds from the sale of shares by the
Selling Shareholders.
 
  Prior to this Offering, there has been no public market for the Common Stock
of the Company. It is currently estimated that the initial public offering
price will be between $12.50 and $14.50 per share. See "Underwriting" for
information relating to the method of determining the initial public offering
price. The Company has made application for inclusion of the Common Stock on
the Nasdaq National Market under the symbol "OSIS."
 
                                  ----------
 
   THE COMMON STOCK OFFERED HEREBY INVOLVES A HIGH DEGREE OF RISK. SEE "RISK
                         FACTORS" BEGINNING ON PAGE 7.
 
                                  ----------
 
THESE  SECURITIES HAVE NOT BEEN APPROVED  OR DISAPPROVED BY THE SECURITIES  AND
 EXCHANGE   COMMISSION  OR  ANY  STATE  SECURITIES  COMMISSION  NOR  HAS   THE
  COMMISSION  OR ANY STATE SECURITIES COMMISSION PASSED UPON THE  ACCURACY OR
   ADEQUACY  OF THIS  PROSPECTUS. ANY  REPRESENTATION TO THE  CONTRARY IS  A
    CRIMINAL OFFENSE.
 
<TABLE>
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
<CAPTION>
                                   UNDERWRITING                    PROCEEDS TO
                  PRICE TO        DISCOUNTS AND    PROCEEDS TO       SELLING
                   PUBLIC         COMMISSIONS(1)    COMPANY(2)   SHAREHOLDERS(2)
- --------------------------------------------------------------------------------
<S>           <C>              <C>              <C>              <C>
Per Share...    $                $                $                $
- --------------------------------------------------------------------------------
Total(3)....    $                $                $                $
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
</TABLE>
(1) The Company and the Selling Shareholders have agreed to indemnify the
    several Underwriters against certain liabilities, including liabilities
    under the Securities Act of 1933, as amended (the "Securities Act"). See
    "Underwriting."
(2) Before deducting estimated offering expenses of $    payable by the Company
    and $       payable by the Selling Shareholders.
(3) Certain of the Selling Shareholders have granted to the Underwriters a 30-
    day option to purchase up to an additional 555,000 shares of Common Stock
    solely to cover over-allotments, if any. If such over-allotment option is
    exercised in full, the total Price to Public, Underwriting Discounts and
    Commissions, and Proceeds to Selling Shareholders will be $    , $     and
    $    , respectively. See "Underwriting."
 
                                  ----------
 
  The Common Stock is offered by the Underwriters as stated herein, subject to
receipt and acceptance by them and subject to their right to reject any order
in whole or in part. It is expected that delivery of such shares will be made
through the offices of Robertson, Stephens & Company LLC ("Robertson, Stephens
& Company"), San Francisco, California, on or about      , 1997.
 
ROBERTSON, STEPHENS & COMPANY
                            WILLIAM BLAIR & COMPANY
                                                    VOLPE BROWN WHELAN & COMPANY
 
                  The date of this Prospectus is      , 1997.
<PAGE>
 
     OSI Systems, Inc. is a vertically integrated worldwide provider of devices,
subsystems and end-products based on optoelectronic technology.  The Company 
designs and manufactures optoelectronic devices and value-added subsystems for 
original equipment manufacturers for use in a broad range of applications, 
including security, medical diagnostics, telecommunications, office automation, 
aerospace, computer peripherals and industrial automation.  In addition, the 
Company utilizes its optoelectronic technology and design capabilities to 
manufacture security and inspection products that it markets worldwide to end 
users under the "Rapiscan" brand name.  These products are used to inspect 
baggage, cargo and other objects for weapons, explosives, drugs and other 
contraband.
                                       
                                   RAPISCAN      
                           
                       Security and Inspection Products      
    
[Picture of a woman standing in front of a Rapiscan 119
Table Top System machine]
Rapiscan 119 Table Top System      
    
[Picture of a woman walking through a Rapiscan AMD 750 Metal
Arch machine]
Rapiscan AMD 750 Metal Arch      
    
[Picture of Rapiscan 520 Carry On System machine]
Rapiscan 520 Carry On System      
    
[Picture of Rapiscan 532 Cargo System machine with image of 
person next to the system]
Rapiscan 532 Cargo System      
    
[Three images of baggage with various contents]
Conventional Dual Energy Image
Organic Material Image
Enhanced Picture X-Ray (EPX) Image      
    
[Picture of a Rapiscan Series 500 X-Ray van with open side
door]
Rapiscan Series 500 X-Ray Van      


  CERTAIN PERSONS PARTICIPATING IN THIS OFFERING MAY ENGAGE IN TRANSACTIONS
THAT STABILIZE, MAINTAIN, OR OTHERWISE AFFECT THE PRICE OF THE COMMON STOCK,
INCLUDING BY OVER-ALLOTMENT, ENTERING STABILIZING BIDS, EFFECTING SYNDICATE
COVERING TRANSACTIONS OR THE IMPOSITION OF PENALTY BIDS. FOR A DESCRIPTION OF
THESE ACTIVITIES, SEE "UNDERWRITING."
<PAGE>
 
                              [TWO PAGE GATEFOLD]






                                   
                               OSI SYSTEMS, INC.
                               ----------------      
                          
                     Optoelectronic Devices and Subsystems      
    
[Picture of man with Pulse Oximetry Probe attached to his finger and woman 
sitting next to him]
Pulse Oximetry Probe      
    
[Picture of computer and medical imaging equipment]
Medical Imaging Sensor Electronics      
    
[Picture of hand-held Barcode Readout Sensor]
Barcode Readout Sensor      
    
[Picture of detector device]
High Energy Radiation Detector      
    
[Picture of various cables and subassemblies]
Opto-Assembly/Medical      
    
[Picture of various printed circuit boards]
Custom PC Boards      
    
[Picture of various optical components and subassemblies]
Optics      
    
[Picture of X-ray scanning machine]
Imaging Sensor Electronics      
    
[Picture of military attack helicopter]
Laser Warning Detector      
    
[Picture of sensor device]
Satellite Sun Sensors      
    
[Picture of submarine]
Fire Detection Subassembly      
    
[Picture of various molding parts and casings]
Tool & Die and Injection Molding      
    
[Picture of various photodetectors]
Custom Photodetectors      
    
[Picture of various chips and printed circuit boards]
Ceramic Substrates/Hybrids      
    
[Picture of array chip]
Hybrid      
    
[Picture of slot machine]
Hopper Optical Assembly      
    
[Schematic Image of Ring Laser Gyro Detector]
Ring Laser Gyro (RLG) Detector      
    
[Picture of Color Sensor Hybrid]
Color Sensor Hybrid      

<PAGE>
 
  NO DEALER, SALES REPRESENTATIVE OR ANY OTHER PERSON HAS BEEN AUTHORIZED TO
GIVE ANY INFORMATION OR TO MAKE ANY REPRESENTATIONS IN CONNECTION WITH THIS
OFFERING OTHER THAN THOSE CONTAINED IN THIS PROSPECTUS, AND, IF GIVEN OR MADE,
SUCH INFORMATION OR REPRESENTATIONS MUST NOT BE RELIED UPON AS HAVING BEEN
AUTHORIZED BY THE COMPANY, ANY SELLING SHAREHOLDER OR ANY UNDERWRITER. THIS
PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL, OR A SOLICITATION OF AN OFFER
TO BUY, ANY SECURITIES OTHER THAN THE REGISTERED OFFER AND SALE OF THE
SECURITIES TO WHICH IT RELATES OR AN OFFER TO, OR A SOLICITATION OF, ANY
PERSON IN ANY JURISDICTION WHERE SUCH AN OFFER OR SOLICITATION WOULD BE
UNLAWFUL. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE HEREUNDER
SHALL, UNDER ANY CIRCUMSTANCES, CREATE ANY IMPLICATION THAT THERE HAS BEEN NO
CHANGE IN THE AFFAIRS OF THE COMPANY SINCE THE DATE HEREOF OR THAT THE
INFORMATION CONTAINED HEREIN IS CORRECT AS OF ANY TIME SUBSEQUENT TO THE DATE
HEREOF.
 
  UNTIL    , 1997 (25 DAYS FROM THE DATE OF THIS PROSPECTUS), ALL DEALERS
EFFECTING TRANSACTIONS IN THE COMMON STOCK, WHETHER OR NOT PARTICIPATING IN
THIS DISTRIBUTION, MAY BE REQUIRED TO DELIVER A PROSPECTUS. THIS DELIVERY
REQUIREMENT IS IN ADDITION TO THE OBLIGATION OF DEALERS TO DELIVER A
PROSPECTUS WHEN ACTING AS UNDERWRITERS AND WITH RESPECT TO THEIR UNSOLD
ALLOTMENTS OR SUBSCRIPTIONS.
                                --------------- 
                               TABLE OF CONTENTS
<TABLE>
<CAPTION>
                                                                            PAGE
                                                                            ----
<S>                                                                         <C>
Prospectus Summary........................................................    4
Risk Factors..............................................................    7
Use of Proceeds...........................................................   15
Dividend Policy...........................................................   15
Capitalization............................................................   16
Dilution..................................................................   17
Selected Consolidated Financial Data......................................   18
Management's Discussion and Analysis of Financial Condition and Results of
 Operations...............................................................   19
Business..................................................................   28
Management................................................................   41
Certain Transactions......................................................   49
Principal and Selling Shareholders........................................   51
Description of Capital Stock..............................................   54
Shares Eligible for Future Sale...........................................   55
Underwriting..............................................................   56
Legal Matters.............................................................   58
Experts...................................................................   58
Additional Information....................................................   58
Index to Consolidated Financial Statements................................  F-1
</TABLE>
 
                                ---------------
  The Company intends to furnish its shareholders with annual reports
containing consolidated audited financial statements and quarterly reports
containing unaudited consolidated financial data for the first three quarters
of each fiscal year.
 
  Rapiscan(R) is a registered trademark of the Company. This Prospectus also
contains trademarks and tradenames of other companies.
 
  The Company is a California corporation organized in 1987. In June 1997, the
Company changed its name from Opto Sensors, Inc. to OSI Systems, Inc. The
Company's principal subsidiaries are: UDT Sensors, Inc., a California
corporation ("UDT Sensors"); Rapiscan Security Products (U.S.A.), Inc., a
California corporation ("Rapiscan U.S.A."); Ferson Optics, Inc. ("Ferson"), a
California corporation; Rapiscan Security Products Limited, a United Kingdom
corporation ("Rapiscan UK"); Opto Sensors (Singapore) Pte Ltd, a corporation
organized under the laws of Singapore ("OSI Singapore"); Opto Sensors
(Malaysia) Sdn. Bhd., a Malaysian corporation ("OSI Malaysia"); and Advanced
Micro Electronics AS, a Norwegian company ("AME"). The principal executive
offices of the Company are located at 12525 Chadron Avenue, Hawthorne,
California 90250. The Company's telephone number is (310) 978-0516. Unless
otherwise indicated by the context, all references in this Prospectus to the
"Company" are to OSI Systems, Inc. and to one or more, but not necessarily all
of its consolidated subsidiaries.
 
                                       3
<PAGE>
 
                               PROSPECTUS SUMMARY
 
  The following summary is qualified in its entirety by the more detailed
information and consolidated financial statements and notes thereto appearing
elsewhere in this Prospectus, including the information under "Risk Factors."
 
                                  THE COMPANY
 
  OSI Systems, Inc. (the "Company") is a vertically integrated worldwide
provider of devices, subsystems and end-products based on optoelectronic
technology. The Company designs and manufactures optoelectronic devices and
value-added subsystems for original equipment manufacturers ("OEMs") for use in
a broad range of applications, including security, medical diagnostics,
telecommunications, office automation, aerospace, computer peripherals and
industrial automation. In addition, the Company utilizes its optoelectronic
technology and design capabilities to manufacture security and inspection
products that it markets worldwide to end users under the "Rapiscan" brand
name. These products are used to inspect baggage, cargo and other objects for
weapons, explosives, drugs and other contraband. In fiscal 1997, revenues from
the sale of optoelectronic devices and subsystems amounted to $42.9 million, or
approximately 55.2%, of the Company's revenues, while revenues from sales of
security and inspection products amounted to $34.7 million, or approximately
44.8%, of the Company's revenues.
 
 Optoelectronic Devices and Subsystems
 
  The Company manufactures a wide range of optoelectronic devices which it
integrates into complex subsystems vital to various end products, including x-
ray and computer tomography ("CT") imaging systems, industrial robotics,
medical monitoring and diagnostic products, optical drives for computer
peripherals, bar code scanners, and aviation gyroscopes. These optoelectronic
devices operate by sensing light of varying wave lengths and converting the
light into electronic signals. In addition to manufacturing optoelectronic
devices, the Company produces optoelectronic subsystems and offers a range of
vertically integrated services to its subsystem customers. These services
include component design and customization, subsystem concept design and
application engineering, product prototyping and development, pre-production,
and short-run and high volume manufacturing. In fiscal 1997, the Company
manufactured subsystems for use in more than 100 different applications,
including those of approximately 50 major OEM customers such as Picker
International, Honeywell Avionics, Eastman Kodak, Xerox, Johnson & Johnson,
Bausch & Lomb, Texas Instruments, Boeing Aircraft Co. and Hewlett-Packard.
During fiscal 1997, no single OEM customer accounted for more than 10.0% of the
Company's revenues and the top five customers collectively represented less
than 20.0% of the Company's revenues.
 
  The Company believes that in recent years advances in technology and
reductions in the cost of key components of optoelectronic systems, including
computer processing power and memory, have broadened the market by enabling the
use of optoelectronic devices in a greater number of applications. In addition,
the Company believes that there is a trend among OEMs to increasingly outsource
the design and manufacture of optoelectronic subsystems to fully integrated,
independent manufacturers who may have greater specialization, broader
expertise, and the ability and flexibility to respond in shorter time periods
than the OEMs could accomplish in-house. The Company believes that its high
level of vertical integration, substantial engineering resources, expertise in
the use and application of optoelectronic technology, and low-cost
international manufacturing operations, enable it to effectively compete in the
market for optoelectronic devices and subsystems.
 
 Security and Inspection Products
 
  The Company manufactures a range of security and inspection products that are
used for conventional security purposes including the detection of concealed
weapons and contraband, as well as for a variety of non-security applications.
The Company's security and inspection products utilize linear x-ray technology
to create a two-dimensional image of the contents of the object being
inspected. These products may function either as stand-alone systems or as
components of an integrated security system. Locations where these products are
currently used for security inspection purposes include airports, government
offices, post offices,
 
                                       4
<PAGE>
 
courthouses, jails, embassies, commercial buildings and mail sorting
facilities. Non-security inspection uses of these products include the
detection of illegal narcotics, inspection of agricultural products,
examination of cargo to mitigate the avoidance of import duties, and non-
destructive product testing. The Company currently manufactures 16 models of
products with different sizes, price points and imaging capabilities in order
to appeal to the breadth of security and non-security applications for its
products. Since entering the security and inspection market in 1993, the
Company has shipped more than 2,000 units of its security and inspection
products to over 50 countries. The Company believes that the growth in the
market for security and inspection products will continue to be driven by the
increased perception of threat fueled by recent terrorist incidents, increased
government mandates and appropriations, and the emergence of a growing market
for the non-security applications of its products.
 
  The Company's objectives are to be a leading provider of specialized
optoelectronic products, to enhance its position in the international
inspection and detection marketplace, and to leverage its expertise in the
optoelectronic technology industry by integrating into new end-markets on a
selective basis. Key elements of the Company's growth strategy include
leveraging its expertise in optoelectronic design and manufacturing to address
new applications, further penetrating existing security and inspections
markets, capitalizing on its high-level of vertical integration and on its
global presence, and selectively entering into new end-product markets. Since
1990, the Company has completed four acquisitions. The Company intends to
continue to pursue additional acquisition opportunities that expand the
Company's technological capabilities, increase the breadth of its product
offerings, and increase its geographic presence. As with the security and
inspection operations that the Company acquired in 1993, the Company seeks to
make acquisitions in which: (i) the Company's core optoelectronic technology is
a significant technology component; (ii) the market for the products offers
favorable pricing dynamics; (iii) the competitive market dynamics provide for
substantial growth in market share; and (iv) the Company's existing
manufacturing, sales and service organization provide the acquired operations
with a strategic and cost advantage.
 
  The Company currently manufactures its optoelectronic devices and subsystems
at facilities in Hawthorne, California, in Ocean Springs, Mississippi, in Johor
Bahru, Malaysia, and in Horten, Norway. Its security and inspection products
are currently manufactured at facilities in Crawley, England, in Long Beach,
California, and in Johor Bahru, Malaysia. As of June 30, 1997 the Company
marketed its products worldwide through approximately 42 sales and marketing
employees located in five countries, and through approximately 95 independent
sales representatives.
 
                                  THE OFFERING
 
<TABLE>
<S>                                   <C>
Common Stock Offered by the Company.  3,330,000 shares
Common Stock Offered by the Selling
 Shareholders.......................    370,000 shares
Common Stock Outstanding after the
 Offering...........................  9,486,528 shares(1)
Use of Proceeds.....................  To repay certain indebtedness, to increase
                                      funds available for research and
                                      development, to enhance its sales and
                                      marketing capabilities, to pursue possible
                                      acquisitions, and for general corporate
                                      purposes, including working capital. See
                                      "Use of Proceeds."
Proposed Nasdaq National Market
 Symbol.............................  OSIS
</TABLE>
- ---------------
(1) Based on the number of shares outstanding on August 15, 1997. Excludes
    approximately 860,486 shares of Common Stock issuable upon exercise of
    outstanding stock options at a weighted average exercise price of $7.34 per
    share.
 
                                       5
<PAGE>
 
                      SUMMARY CONSOLIDATED FINANCIAL DATA
                (In thousands, except share and per share data)
<TABLE>
<CAPTION>
                                              YEAR ENDED JUNE 30,
                               -------------------------------------------------
                                 1993      1994      1995      1996      1997
                               --------- --------- --------- --------- ---------
<S>                            <C>       <C>       <C>       <C>       <C>
CONSOLIDATED STATEMENTS OF
 OPERATIONS DATA:
 Revenues....................    $27,225   $47,735   $49,815   $61,518   $77,628
 Cost of goods sold..........     20,591    36,037    37,818    45,486    56,174
                               --------- --------- --------- --------- ---------
 Gross profit................      6,634    11,698    11,997    16,032    21,454
 Operating expenses:
  Selling, general and
   administrative(1).........      4,014     7,974     7,601     9,757    11,304
  Research and development...      1,034     1,451     1,591     1,663     2,504
  Stock option
   compensation(2)...........        --        --        --        --        856
                               --------- --------- --------- --------- ---------
  Total operating expenses...      5,048     9,425     9,192    11,420    14,664
                               --------- --------- --------- --------- ---------
 Income from operations......      1,586     2,273     2,805     4,612     6,790
 Interest expense............        471       710     1,251     1,359     1,197
                               --------- --------- --------- --------- ---------
 Income before income taxes
  and minority interest......      1,115     1,563     1,554     3,253     5,593
 Provision for income taxes..        462       814       413     1,111     1,416
                               --------- --------- --------- --------- ---------
 Income before minority
  interest...................        653       749     1,141     2,142     4,177
 Minority interest...........          6        38        17       117       --
                               --------- --------- --------- --------- ---------
 Net income..................       $659      $787    $1,158    $2,259    $4,177
                               ========= ========= ========= ========= =========
 Net income available to
  common shareholders(3)(4)..       $814      $995    $1,357    $2,308    $4,269
                               ========= ========= ========= ========= =========
 Net income per
  share(3)(4)(5).............      $0.13     $0.16     $0.22     $0.38     $0.68
                               ========= ========= ========= ========= =========
 Weighted average shares
  outstanding(5).............  6,139,429 6,249,674 6,172,901 6,134,669 6,263,963
</TABLE>
 
<TABLE>
<CAPTION>
                                                              JUNE 30, 1997
                                                          ----------------------
                                                          ACTUAL  AS ADJUSTED(6)
                                                          ------- --------------
<S>                                                       <C>     <C>
CONSOLIDATED BALANCE SHEET DATA:
 Cash.................................................... $   553    $29,839
 Working capital.........................................  10,800     49,961
 Total assets............................................  47,333     76,619
 Total debt..............................................  13,180      1,258
 Total shareholders' equity..............................  16,809     58,017
</TABLE>
- -------------
(1) Fiscal 1994 includes a one-time charge of $1.5 million incurred in
    connection with the settlement of a governmental proceeding. See
    "Business--Legal Proceedings."
(2) Represents a charge resulting from the acceleration of the vesting periods
    of outstanding stock options having exercise prices below the fair market
    value on the date of grant. The charge had the effect of decreasing income
    from operations, net income and net income available to common shareholders
    by $856,000, $514,000 and $514,000 respectively.
(3) Gives effect to the conversion of certain subordinated debt into preferred
    stock and Common Stock in October and November 1996, and the issuance of
    Common Stock for the purchase of the remaining minority interests in
    certain subsidiaries in October and December 1996 as if such transactions
    occurred on July 1, 1992. Adjustments in each of the five years ended June
    30, 1997 consist of: (i) the elimination of interest expense related to
    converted subordinated debt of $161,000, $246,000, $216,000, $166,000 and
    $92,000, net of income taxes, respectively; and (ii) the elimination of the
    minority interest in the net loss of subsidiaries of $6,000, $38,000,
    $17,000, $117,000 and $0, respectively.
(4) Supplementary net income for each of the five years ended June 30, 1997 is
    $936,000, $1,163,000, $1,939,000, $2,913,000 and $4,872,000, respectively,
    reflecting the reduction in interest expense, net of income taxes, from the
    effect of debt repayments discussed under "Use of Proceeds." Supplementary
    net income per share for the corresponding periods is $0.15, $0.18, $0.28,
    $0.42 and $0.68, respectively, and reflects only the additional shares
    issued to repay that debt.
(5) Assumes the conversion of 2,568,750 shares of preferred stock into
    3,853,125 shares of Common Stock as of July 1, 1992. The preferred stock
    had a liquidation preference of $1.00 per share, and was otherwise entitled
    to the same voting, dividend and all other rights as the Common Stock.
(6) Adjusted to give effect to the sale of 3,330,000 shares of Common Stock
    offered by the Company hereby, at an assumed initial public offering price
    of $13.50 per share and after deducting underwriting discounts, commissions
    and estimated Offering expenses, and the application of the net proceeds
    therefrom.
 
  Unless otherwise indicated, all information in this Prospectus: (i) reflects
a 1.5-for-1 stock split (the "Stock Split") of the Common Stock effected in
June 1997; (ii) reflects the conversion of each outstanding share of the
Company's preferred stock into 1.5 shares of the Common Stock concurrent with
the Stock Split; and (iii) assumes the Underwriters' over-allotment is not
exercised. All references to the Company's fiscal years refer to the periods
ending June 30.
 
                                       6
<PAGE>
 
                                 RISK FACTORS
 
  In addition to the other information in this Prospectus, investors should
carefully consider the following risk factors when evaluating an investment in
the Common Stock offered hereby. This Prospectus contains forward-looking
statements that involve risks and uncertainties, such as statements of the
Company's plans, objectives, expectations and intentions. The cautionary
statements made in this Prospectus should be read as being applicable to all
forward-looking statements wherever they appear in this Prospectus. The
Company's actual results could differ materially from those discussed herein.
Factors that could cause or contribute to such differences include those
discussed below, as well as those discussed elsewhere in this Prospectus.
 
FLUCTUATIONS IN QUARTERLY RESULTS
 
  The Company's quarterly operating results have varied in the past and are
likely to vary significantly in the future. These quarterly fluctuations are
the result of a number of factors, including the volume and timing of orders
received and shipments made during the period, variations in the Company's
product mix, changes in demand for the Company's products, the timing and
amount of expenditures made by the Company in anticipation of future sales,
variability in selling price, and other competitive conditions. The Company's
revenues, particularly from the sale of security and inspection products, are
increasingly dependent upon larger orders of multiple units and upon the sale
of products having higher average selling prices. The Company is unable to
predict the timing of the receipt of such orders and, as a result, significant
variations between forecasts and actual orders will often occur. Furthermore,
the rescheduling of the shipment of any large order, or portion thereof, or
any production difficulties or delays experienced by the Company, could have a
material adverse effect on the Company's quarterly operating results. Due to
the foregoing factors, it is possible that in future quarters the Company's
operating results will not meet the expectations of public market analysts and
investors. In such event, the price of the Company's Common Stock would be
materially adversely affected. See "Management's Discussion and Analysis of
Financial Condition and Results of Operations," and "Business -- Backlog."
 
COMPETITION
 
  The markets in which the Company operates are highly competitive and are
characterized by evolving customer needs and rapid technological change. The
Company competes with a number of other manufacturers, many of whom have
significantly greater financial, technical and marketing resources than the
Company. In addition, these competitors may have the ability to respond more
quickly to new or emerging technologies, may adapt more quickly to changes in
customer requirements, may have stronger customer relationships, may have
greater name recognition, and may devote greater resources to the development,
promotion and sale of their products than does the Company. In the
optoelectronic device and subsystem market, competition is based primarily on
factors such as expertise in the design and development of optoelectronic
devices, product quality, timeliness of delivery, price, customer technical
support, and on the ability to provide fully integrated services from
application development and design through volume subsystem production. The
Company believes that its major competitors in the optoelectronic device and
subsystem market are EG&G Electro-Optics, a division of EG&G, Inc., Optek
Technology Inc., Hamamatsu Corporation, and Honeywell Optoelectronics, a
division of Honeywell, Inc. In the security and inspection market, competition
is based primarily on such factors as product performance, functionality and
quality, the over-all cost of the system, prior customer relationships,
technological capabilities of the product, price, certification by government
authorities, local market presence, and breadth of sales and service
organization. The Company believes that its principal competitors in the
market for security and inspection products are EG&G Astrophysics, a division
of EG&G, Inc. ("EG&G Astrophysics"), Heimann Systems GmbH, InVision
Technologies, Inc., Vivid Technologies, American Science and Engineering,
Inc., Barringer Technologies Inc., Control Screening L.L.C., and Thermedics
Detection, Inc. In addition, the Company supplies optoelectronic devices and
subsystems to certain OEMs which, in turn, manufacture end-products that
compete with the Company's own products. There can be no assurance that these
competing OEMs will continue to purchase
 
                                       7
<PAGE>
 
optoelectronic products from the Company. Competition could result in price
reductions, reduced margins, and a decrease in the Company's market share.
There can be no assurance that the Company will be able to compete
successfully against any current or future competitors in either market or
that future competitive pressures will not materially and adversely affect its
business, financial condition and results of operations. See "Business--
Competition."
 
LARGE ORDERS; LENGTHY SALES CYCLES
 
  Sales of the Company's security and inspection products have increasingly
been characterized by large orders of multiple units or of products having
higher average selling prices. The Company's inability to obtain such
additional large orders could have a material adverse effect on the Company's
business, financial condition and results of operations. Sales of security and
inspection products depend in significant part upon the decision of
governmental agencies to upgrade or expand existing airports, border crossing
inspection sites and other security installations. Accordingly, a portion of
the Company's sales of security inspection and detection products is often
subject to delays associated with the lengthy approval processes that often
accompany such capital expenditures. During these approval periods, the
Company expends significant financial and management resources in anticipation
of future orders that may not occur. A failure by the Company to receive an
order after expending such resources could have a material adverse effect on
its business, financial condition and results of operations.
 
RAPID TECHNOLOGICAL CHANGE
 
  The markets for all of the Company's products are subject to rapidly
changing technology. As OEMs seek to develop and introduce new,
technologically-advanced products and product enhancements, the Company is
required to design, develop and manufacture optoelectronic devices and
subsystems to meet these new and enhanced product requirements. Accordingly,
the Company's performance as a designer and manufacturer of optoelectronic
devices and subsystems is dependent upon its ability to keep pace with
technological developments in both the optoelectronic market and in the
numerous markets that its products serve. Any delay or failure in the
Company's ability to design and manufacture the increasingly complex and
technologically-advanced products that its customers demand will have a
material adverse effect on the Company's business, financial condition and
results of operations. In addition, technological changes and market forces
continually affect the products sold by the Company's customers and thereby
alter the demand for the Company's optoelectronic subsystems. The Company has
in the past suddenly and unexpectedly lost orders for entire subsystem product
lines due to technological changes that made the products sold by the
Company's customers obsolete. The market for the Company's security and
inspection products is also characterized by rapid technological change as the
security industry seeks to develop new and more sophisticated products. New
and enhanced security and inspection products are continuously being developed
and introduced by the Company's competitors, including products that use
advanced x-ray technologies, CT technology, or electro-magnetic and ultrasound
technologies. The Company believes that its future success in the security and
inspection industry will depend in large part upon its ability to enhance its
existing product lines and to successfully develop new products that meet
changing customer requirements. No assurance can be given that new industry
standards or changing technology will not render the Company's existing
security and inspection products obsolete. The failure of the Company's
security and inspection product lines to meet new technological requirements
or new industry standards will have a material adverse effect on the Company's
business, financial condition and results of operations.
 
AVAILABILITY OF RAW MATERIALS AND COMPONENTS
 
  The Company purchases certain raw materials and subcomponents from third
parties pursuant to purchase orders placed from time to time. Purchase order
terms range from three months to one year at fixed costs, but the Company has
no guaranteed long-term supply arrangements with its suppliers. Any material
interruption in the Company's ability to purchase necessary raw materials or
subcomponents could have a material adverse effect on the Company's business,
financial condition and results of operations. Silicon-based optoelectronic
devices manufactured by the Company are critical components in most of the
Company's
 
                                       8
<PAGE>
 
subsystems. Since 1987, the Company has purchased substantially all of the
silicon wafers it uses to manufacture its optoelectronic devices from Wacker
Siltronic Corp., a United States subsidiary of Wacker Siltronic AG, a German
company. The Company's dependence on this single source of supply exposes the
Company to several risks, including limited control over pricing, availability
of material, and material delivery schedules. Although the Company has not
experienced any significant shortages or material delays in obtaining silicon
wafers from Wacker Siltronic Corp., a major interruption in the delivery of
silicon wafers from Wacker Siltronic Corp. would materially disrupt the
Company's operations and could have a material adverse effect on the Company's
business, financial condition and results of operations. The inability of the
Company to develop alternative sources for single or sole source components,
or to obtain sufficient quantities of these components, would adversely affect
the Company's operations. See "Business--Manufacturing and Materials
Management."
 
INTERNATIONAL BUSINESS; FLUCTUATION IN EXCHANGE RATES; RISKS OF CHANGES IN
FOREIGN REGULATIONS
 
  In fiscal 1995, 1996 and 1997, revenues from shipments made outside of the
United States accounted for approximately 32.0%, 38.0% and 42.2%,
respectively, of the Company's revenues. Of the revenues generated during
fiscal 1997 from shipments made outside of the United States, 14.9%
represented sales from the United States to foreign customers, and the balance
represented sales generated by the Company's foreign subsidiaries. The Company
anticipates that international sales will continue to account for a material
portion of the Company's revenues and that, accordingly, a major portion of
the Company's business will be exposed to the risks associated with conducting
international business operations, including unexpected changes in regulatory
requirements, changes in foreign legislation, possible foreign currency
controls, currency exchange rate fluctuations or devaluations, tariffs,
difficulties in staffing and managing foreign operations, difficulties in
obtaining and managing vendors and distributors, potentially negative tax
consequences, and difficulties in collecting accounts receivable. The Company
is also subject to risks associated with laws regulating the import and export
of high technology products. The Company cannot predict whether quotas,
duties, taxes or other charges or restrictions upon the importation or
exportation of the Company's products will be implemented by the United States
or any other country in the future. There can be no assurance that any of
these factors will not have a material adverse effect on the Company's
business, financial condition and results of operations.
 
RISKS ASSOCIATED WITH MANAGING GROWTH AND ACQUISITIONS
 
  Since 1990, the Company has experienced significant growth through both
internal expansion and through acquisitions. During this period, OSI Systems,
Inc. established its Rapiscan U.S.A. operations and its Malaysian
manufacturing facilities and acquired UDT Sensors, Rapiscan UK, Ferson and
AME. This growth has placed, and may continue to place, significant demands on
the Company's management, working capital and financial resources. Failure to
continue to expand and enhance the Company's management and its financial
control systems could adversely affect the Company's business, financial
condition and results of operations. There can be no assurance that the
Company's current management and systems will be adequate to address any
future expansion of the Company's business. An element of the Company's
strategy is to pursue acquisitions that would complement its existing range of
products, augment its market coverage or enhance its technological
capabilities or that may otherwise offer growth opportunities. Such future
acquisitions by the Company could result in potentially dilutive issuances of
equity securities, the incurrence of debt and contingent liabilities, and the
amortization of expenses related to goodwill and other intangible assets, any
of which could materially adversely affect the Company's business, financial
condition and results of operations. Acquisitions entail numerous risks,
including difficulties in the assimilation of acquired operations,
technologies and products, diversion of management's attention to other
business concerns, risks of entering markets in which the Company has no, or
limited, prior experience and the potential loss of key employees of acquired
organizations. No assurance can be given as to the ability of the Company to
successfully integrate any acquired business, product, technology or personnel
with the operations of the Company, and the failure of the Company to do so
could have a material adverse effect on the Company's business, financial
condition and results of operations. While the Company has no current
agreement or negotiations underway with
 
                                       9
<PAGE>
 
respect to any such acquisition, the Company may make acquisitions of
businesses, products or technologies in the future. See "Use of Proceeds."
 
PROPRIETARY TECHNOLOGY; PENDING LITIGATION
 
  The Company believes that its principal competitive strength is its ability
to design, develop and manufacture complex optoelectronic devices and
subsystems for various industry segments. The Company does not rely upon any
of its own patents or copyrights in the development or manufacture of its
products. Accordingly, there are no legal barriers that prevent potential
competitors from copying the Company's products, processes and technologies or
from otherwise entering into operations in direct competition with the
Company.
 
  The Company's Rapiscan U.S.A. subsidiary has entered into a non-exclusive
patent license agreement with EG&G Inc. Under the license, Rapiscan U.S.A. is
permitted to make, use and sell or otherwise dispose of security and
inspection products that use an x-ray line scan system for baggage inspection
purposes covered by EG&G Inc.'s patent. The patent, which expires in 2000,
does not affect sales of the Company's security and inspection products
manufactured and sold outside of the United States. The license may be
terminated by EG&G Inc. in the event of a breach of the license agreement by
Rapiscan U.S.A. The termination of the EG&G Inc. license would have a material
adverse effect upon the Company's sales of its security and inspection
products in the United States and upon the Company's business, financial
condition and results of operations.
 
  In a lawsuit currently pending before the United States District Court for
the Central District of California, Lunar Corporation ("Lunar") and the
University of Alabama Research Foundation ("UAB") have alleged that OSI
Systems, Inc., UDT Sensors and Rapiscan U.S.A. infringe United States Patent
No. 4,626,688 (" '688 patent"). UAB owns the '688 patent and has granted an
exclusive license to Lunar. The '688 patent is directed to a dual energy
radiation detector. The lawsuit concerns those Rapiscan U.S.A.'s baggage
scanner products which contain a dual energy detector, and detector components
produced by UDT Sensors ("accused products"). Lunar and UAB are requesting
that the court grant them damages in an unspecified amount and an injunction
barring Rapiscan U.S.A., UDT Sensors and OSI Systems, Inc. from making, using,
selling or offering for sale, the accused products in the United States.
Rapiscan U.S.A., UDT Sensors and OSI Systems, Inc. have alleged that the
accused products do not infringe the '688 patent, that the '688 patent is
invalid and that in any event, Lunar had previously agreed that Rapiscan
U.S.A. and UDT Sensors did not infringe the '688 patent, so that Lunar's claim
is estopped, limited by laches or that an implied license has been granted by
Lunar.
 
  The Company believes it has meritorious defenses and claims in the lawsuit
with Lunar and UAB and believes that the likelihood of Lunar and UAB
prevailing in its patent infringement lawsuit against the Company is remote.
However, no assurance can be given that the Company will be successful in this
lawsuit. In the event that the court determines that the accused products
infringe the '688 patent and that Rapiscan U.S.A. and UDT Sensors do not have
the right to use technology covered by the '688 patent, the court could grant
Lunar and UAB a permanent injunction in which case Rapiscan U.S.A. could be
prevented from marketing most of its baggage scanner products in the United
States and UDT Sensors could be prevented from marketing certain detector
components. Rapiscan U.S.A. and UDT Sensors could also be required to pay a
significant amount of damages. Any such outcome would have a material adverse
effect upon the Company's business, financial condition and results of
operations. For the year ended June 30, 1997, sales of security and inspection
products that are allegedly infringing upon Lunar and UAB's rights constituted
$10.5 million or approximately 13.5% of the Company's revenues. Through June
30, 1997, the Company has incurred legal fees in the amount of approximately
$368,000 in connection with this lawsuit. The Company intends to pursue
vigorously its legal remedies in this lawsuit. As a result, the Company will
continue to expend significant financial and other resources in connection
with this lawsuit. See "Business--Legal Proceedings."
 
  The Company may from time to time in the future receive communications from
third parties alleging infringements by the Company of patents or other
intellectual property rights owned by such third parties. If
 
                                      10
<PAGE>
 
any of the Company's products are found to infringe a patent, a court may
grant an injunction to prevent the Company from making, selling or using these
products in the applicable country. Protracted litigation may be necessary to
defend the Company against alleged infringement of others' rights.
Irrespective of the validity or the success of such claims, the defense of
such claims could result in significant costs to the Company and the diversion
of time and effort by management, either of which by itself could have a
material adverse effect on the business, financial condition and results of
operations of the Company. Further, adverse determinations in such litigation
could subject the Company to significant liabilities (including treble damages
under certain circumstances), or prevent the Company from selling certain of
its products. If infringement claims are asserted against the Company, the
Company may be forced to seek to obtain a license of such third party's
intellectual property rights. No assurance can be given that the Company could
enter into such a license agreement on terms favorable to the Company, or at
all. The failure to obtain such a license agreement on reasonable terms could
have an adverse effect on the Company's business, financial condition and
results of operations.
 
RISKS ASSOCIATED WITH MANUFACTURING
 
  The Company's ability to manufacture optoelectronic subsystems as well as
security and inspection products is dependent upon the optoelectronic devices
manufactured at the Company's Hawthorne, California facility. In addition, the
Company's success also depends on its ability to manufacture its products at
its various other facilities. Accordingly, any material disruption in the
operations of any of its manufacturing facilities, and especially at its
Hawthorne, California facility, would have a material adverse effect on the
Company's business, financial condition and results of operations. Such
interruption or disruption could occur due to the unavailability of parts,
labor or raw materials, to political unrest, or to natural disasters, such as
earthquakes or fires. The Company also believes that its long-term competitive
position depends in part on its ability to increase manufacturing capacity. No
assurance can be given that the Company will be able to increase its
manufacturing capabilities in the future. The failure of the Company to build
or acquire sufficient additional manufacturing capacity if and when needed
could adversely impact the Company's relationships with its customers and
materially adversely affect the Company's business, financial condition and
results of operations.
 
PRODUCT LIABILITY RISKS
 
  The Company's business exposes it to potential product liability risks,
particularly with respect to its security and inspection products. There are
many factors beyond the control of the Company that could lead to liability
claims, including the failure of the products in which the Company's
subsystems are installed, the reliability of the customer's operators of the
inspection equipment, and the maintenance of the inspection units by the
customers. There can be no assurance that the amount of product liability
insurance that the Company carries will be sufficient to protect the Company
from product liability claims. A product liability claim in excess of the
amount of insurance carried by the Company could have a material adverse
effect on the Company's business, financial condition and results of
operations.
 
DEPENDENCE ON KEY PERSONNEL
 
  The Company is highly dependent upon the continuing contributions of its key
management, technical and product development personnel. In particular, the
Company is dependent upon the services of Deepak Chopra, the Chairman of the
Company's Board of Directors, its President and Chief Executive Officer. In
addition, the loss of the services of any of the Company's other senior
managerial, technical or product development personnel could materially
adversely affect the Company's business, financial condition and results of
operations. The Company has entered into a five-year employment agreement with
Mr. Chopra and maintains a $13.0 million policy of key man life insurance on
the life of Mr. Chopra. The Company has also entered into shorter-term
employment agreements with certain of the Company's senior managerial and
technical personnel but does not maintain key man insurance policies on any of
its other employees. The
 
                                      11
<PAGE>
 
Company's future success depends on its continuing ability to attract, retain
and motivate highly qualified managerial and technical personnel. Competition
for qualified technical personnel is intense. There can be no assurance that
these individuals will continue employment with the Company. The loss of
certain key personnel could materially adversely affect the Company's
business, financial condition and results of operations. See "Business--
Employees" and "Management."
 
ENVIRONMENTAL REGULATION
 
  The Company is subject to various federal, state and local environmental
laws, ordinances and regulations relating to the use, storage, handling and
disposal of certain hazardous substances and wastes used or generated in the
manufacturing and assembly of the Company's products. Under such laws, the
Company may become liable for the costs of removal or remediation of certain
hazardous substances or wastes that have been or are being disposed of offsite
as wastes or that have been or are being released on or in its facilities.
Such laws may impose liability without regard to whether the Company knew of,
or caused, the release of such hazardous substances or wastes. The Company
believes that it is currently in compliance with all material environmental
regulations in connection with its manufacturing operations, that it has
obtained all necessary material environmental permits to conduct its business
and has no knowledge of any offsite disposal or releases on site that could
have a material adverse affect on the Company. However, there can be no
assurance that any environmental assessments undertaken by the Company with
respect to its facilities have revealed all potential environmental
liabilities, that any prior operator of the properties did not create any
material environmental condition not known to the Company, or that an
environmental condition that could result in penalties, expenses, or liability
for the Company does not otherwise exist in any one or more of the facilities.
In addition, the amount of hazardous substances or wastes produced or
generated by the Company may increase in the future depending on changes in
the Company's operations. Any failure by the Company to comply with present or
future regulations could subject the Company to the imposition of substantial
fines, suspension of production, alteration of manufacturing processes or
cessation of operations, any of which could have a material adverse effect on
the Company's business, financial condition and results of operations.
Compliance with such regulations could require the Company to acquire
expensive remediation equipment or to incur substantial expenses. Any failure
of the Company to control or properly manage the use, disposal, removal or
storage of, or to adequately restrict the discharge of, or assist in the
cleanup of, hazardous or toxic substances, could subject the Company to
significant liabilities, including joint and several and retroactive liability
under certain statutes. Furthermore, the presence of hazardous substances on a
property or at certain offsite locations could result in the Company incurring
substantial liabilities as a result of a claim by a private third party for
personal injury or a claim by an adjacent property owner for property damage.
The imposition of any of the foregoing liabilities could materially adversely
affect the Company's business, financial condition and results of operations.
See "Business--Environmental Regulations."
 
CONCENTRATION OF OWNERSHIP; CONTROL BY MANAGEMENT
 
  Upon successful completion of this Offering, the Company's principal
shareholders, Scope Industries and Deepak Chopra, the President and Chief
Executive Officer of the Company, will beneficially own approximately 18.2%
and 16.2%, respectively, of the Company's Common Stock (17.3% and 14.2%,
respectively, if the Underwriters' over-allotment option is exercised in
full), and the present directors and executive officers of the Company
(including Scope Industries, an affiliate of one of the directors) will, in
the aggregate, beneficially own 41.7% of the outstanding Common Stock (37.7%
if the Underwriters' over-allotment option is exercised in full). Meyer
Luskin, the President, Chief Executive Officer, Chairman of the Board of
Directors and principal shareholder of Scope Industries, is a director of the
Company. Consequently, Scope Industries, together with the Company's directors
and executive officers acting in concert, will have the ability to
significantly affect the election of the Company's directors and have a
significant effect on the outcome of corporate actions requiring shareholder
approval. Such concentration may also have the effect of delaying or
preventing a change of control of the Company. See "Principal and Selling
Shareholders," and "Management."
 
                                      12
<PAGE>
 
POSSIBLE ADVERSE EFFECTS OF AUTHORIZATION OF PREFERRED STOCK; POTENTIAL ANTI-
TAKEOVER PROVISIONS
 
  The Company's Articles of Incorporation authorize the Company's Board of
Directors to issue up to 10,000,000 shares of preferred stock in one or more
series, to fix the rights, preferences, privileges and restrictions granted to
or imposed upon any wholly unissued shares of preferred stock, to fix the
number of shares constituting any such series, and to fix the designation of
any such series, without further vote or action by its shareholders. The terms
of any series of preferred stock, which may include priority claims to assets
and dividends and special voting rights, could adversely affect the rights of
the holders of Common Stock and thereby reduce the value of the Common Stock.
The Company has no present plans to issue shares of preferred stock. The
issuance of preferred stock, coupled with the concentration of ownership in
the directors and executive officers, could discourage certain types of
transactions involving an actual or potential change in control of the
Company, including transactions in which the holders of Common Stock might
otherwise receive a premium for their shares over then current prices,
otherwise dilute the rights of holders of Common Stock, and may limit the
ability of such shareholders to cause or approve transactions which they may
deem to be in their best interests, all of which could have a material adverse
effect on the market price of the Common Stock offered hereby. See
"Description of Capital Stock--Preferred Stock."
 
ABSENCE OF PRIOR PUBLIC MARKET AND POSSIBLE VOLATILITY OF STOCK PRICE;
DILUTION
 
  Prior to this Offering there has been no public market for the Common Stock.
The Company has filed an application to have the Common Stock approved for
quotation on the Nasdaq National Market. However, there can be no assurance
that an active trading market for the Common Stock will develop or be
sustained after the Offering. The initial public offering price will be
determined through negotiations between the Company and the representatives of
the Underwriters. See "Underwriting." Additionally, the market price of the
Common Stock could be subject to significant fluctuations in response to
variations in actual and anticipated quarterly operating results and other
factors, including announcements of new products or technical innovations by
the Company or its competitors. Further, investors participating in the
Offering will incur immediate and substantial dilution in the net tangible
book value of their shares. See "Dilution."
 
SHARES ELIGIBLE FOR FUTURE SALE
 
  Sales of substantial amounts of Common Stock in the public market following
this Offering could have an adverse effect on the market price of the Common
Stock. Upon completion of this Offering, the Company will have outstanding
approximately 9,486,528 shares of Common Stock, of which 3,700,000 shares
offered hereby (4,255,000 shares if the Underwriters' over-allotment option is
exercised in full), will be freely tradeable without restriction or further
registration under the Securities Act. The remaining 5,786,528 shares of
Common Stock outstanding upon completion of this Offering are "restricted
securities" as that term is defined in Rule 144 promulgated under the
Securities Act ("Rule 144"). Pursuant to lock-up agreements between certain
securityholders and representatives of the Underwriters, the securityholders
have agreed not to sell approximately 5,761,000 shares of Common Stock
(including any additional shares issued upon the exercise of any options) for
180 days following the date of this Prospectus. However, beginning 180 days
after the date of this Prospectus, subject in certain cases to the volume
restrictions of Rule 144, all 5,786,528 shares will become freely transferable
and available for immediate sale in the public market. The existence of a
large number of shares eligible for future sale could have an adverse impact
on the Company's ability to raise additional equity capital or on the price at
which such equity capital could by raised.
 
LIMITATION ON OFFICERS' AND DIRECTORS' LIABILITIES UNDER CALIFORNIA LAW
 
  The Company's Articles of Incorporation provide that, pursuant to the
California Corporations Code, the liability of the directors of the Company
for monetary damages shall be eliminated to the fullest extent permissible
under California law. This is intended to eliminate the personal liability of
a director for monetary damages in an action brought by, or in the right of,
the Company for breach of a director's duties to the Company or its
shareholders. This provision does not eliminate the directors' fiduciary duty
and does not apply
 
                                      13
<PAGE>
 
for certain liabilities: (i) for acts or omissions that involve intentional
misconduct or a knowing and culpable violation of law; (ii) for acts or
omissions that a director believes to be contrary to the best interest of the
Company or its shareholders or that involve the absence of good faith on the
part of the director; (iii) for any transaction from which a director derived
an improper personal benefit; (iv) for acts or omissions that show a reckless
disregard for the director's duty to the Company or its shareholders in
circumstances in which the director was aware, or should have been aware, in
the ordinary course of performing a director's duties, of a risk of serious
injury to the Company or its shareholders; (v) for acts or omissions that
constitute an unexcused pattern of inattention that amounts to an abdication
of the director's duty to the Company or its shareholders; (vi) with respect
to certain transactions or the approval of transactions in which a director
has a material financial interest; and (vii) expressly imposed by statute for
approval of certain improper distributions to shareholders or certain loans or
guarantees. See "Management--Limitation on Directors' Liability."
 
BROAD DISCRETION AS TO USE OF PROCEEDS
 
  Of the net proceeds of this Offering to be received by the Company,
approximately $29.3 million or approximately 71.1% of the total estimated net
proceeds has been generally allocated to increasing the Company's research and
development activities, to enhancing the Company's sales and marketing
capabilities, to pursuing possible acquisitions, and for working capital
purposes. The amount of net proceeds allocated to each of these specific
purposes has not been established and will, therefore, be used for these
purposes as management may determine in its sole discretion without the need
for shareholder approval with respect to any such allocation.
 
                                      14
<PAGE>
 
                                USE OF PROCEEDS
 
  The net proceeds to the Company from its sale of 3,330,000 shares of Common
Stock offered hereby at an assumed initial public offering price of $13.50 per
share, after deducting estimated underwriting discounts and commissions and
estimated offering expenses payable by the Company, are estimated to be
approximately $41.2 million. The Company will not receive any proceeds from
the sale of shares of Common Stock by the Selling Shareholders. The Selling
Shareholders who own the 370,000 shares to be sold in this Offering will bear
their pro rata share of all expenses incurred in connection with this
Offering.
 
  The principal reasons for this Offering are to enable the Company to repay
bank indebtedness, to increase the Company's research and development
activities, to enhance its sales and marketing capabilities, to pursue
possible acquisitions, and to increase the Company's funds available for
general corporate purposes, including working capital purposes. Although a
portion of the net proceeds may be used to pursue possible strategic
acquisitions, the Company is not currently a party to any commitments or
agreements, and is not currently involved in any negotiations with respect to
any acquisitions. While the Company intends to use the net proceeds it
receives from this Offering for the foregoing purposes, other than the
repayment of indebtedness, the Company is currently unable to specifically
allocate the net proceeds among the foregoing purposes. See "Risk Factors--
Broad Discretion as to Use of Proceeds." The Company intends to repay a total
of approximately $11.9 million outstanding under various bank facilities as
described below.
 
<TABLE>
<CAPTION>
                   APPROXIMATE
                    PRINCIPAL
                    AMOUNT AT          RATE BASIS           RATE AT
FACILITY          JUNE 30, 1997       PER ANNUM(1)       JUNE 30, 1997   MATURITY
- --------          -------------       -----------        -------------   --------
<S>               <C>           <C>                      <C>           <C>
Revolving Credit   $5,077,000   Variable rate plus 0.25%     8.75%     November 1998
Term Loan           2,344,000   Variable rate plus 0.50%     9.00%     March 2001
Revolving Credit    1,500,000   Variable rate plus 0.25%     8.75%     October 1997
Revolving Credit      963,000   Variable rate plus 1.85%     7.85%     December 1997
Revolving Credit      974,000   Variable rate plus 1.50%    10.00%     On demand
Term Loan              41,000   Variable rate plus 2.25%    10.75%     November 1997
Revolving Credit      586,000   Variable rate                6.65%     Evergreen
Term Loan             437,000   5.75%                        5.75%     June 2001
</TABLE>
- ---------------
(1) The term "variable rate" means the bank's prime rate or other published
    reference rate. See "Management's Discussion and Analysis of Financial
    Condition and Results of Operations--Liquidity and Capital Resources."
 
  Borrowings under the foregoing bank facilities are generally used for
working capital purposes. However, in connection with the acquisition of AME
earlier this year, the Company borrowed approximately $900,000 under these
facilities to pay the cash portion of the purchase price of that subsidiary.
 
  The Company is also considering exercising its option to purchase its
headquarters and its engineering and manufacturing facilities in Hawthorne,
California. See "Business--Facilities." If the Company elects to purchase the
facilities, it may use a portion of the proceeds of this Offering to pay part
or all of the approximately $3.0 million purchase price.
 
  Pending the foregoing uses, the Company intends to invest the net proceeds
of this Offering in short-term, interest bearing, investment-grade securities.
 
                                DIVIDEND POLICY
 
  The Company currently anticipates that it will retain any available funds
for use in the operation of its business, and does not currently intend to pay
any cash dividends in the foreseeable future. Future cash dividends, if any,
will be determined by the Board of Directors. The payment of cash dividends by
the Company is restricted by certain of the Company's current bank credit
facilities, and future borrowings may contain similar restrictions.
 
                                      15
<PAGE>
 
                                CAPITALIZATION
 
  The following table sets forth as of June 30, 1997: (i) the actual short-
term debt and capitalization of the Company; and (ii) the short-term debt and
capitalization as adjusted to give effect to the sale of the 3,330,000 shares
of Common Stock offered by the Company hereby at an assumed initial public
offering price of $13.50 per share and the application of the estimated net
proceeds from the Offering.
 
<TABLE>
<CAPTION>
                                                           JUNE 30, 1997
                                                        -------------------
                                                        ACTUAL  AS ADJUSTED
                                                        ------- -----------
                                                            (In thousands)
<S>                                                     <C>     <C> 
Short-term debt........................................ $10,340   $   465
                                                        =======   =======
Long-term debt, less current portion...................   2,840       793
Shareholders' equity:
  Preferred Stock, no par value;
   10,000,000 shares authorized; none issued and
   outstanding.........................................     --        --
  Common Stock, no par value(1)(2);
   40,000,000 shares authorized, actual and as
   adjusted;
   6,156,528 shares issued and outstanding, actual;
   9,486,528 issued and outstanding, as adjusted.......   7,367    48,575
  Retained earnings....................................   9,171     9,171
  Cumulative foreign currency translation adjustment...     271       271
                                                        -------   -------
    Total shareholders' equity.........................  16,809    58,017
                                                        -------   -------
      Total capitalization............................. $19,649   $58,810
                                                        =======   =======
</TABLE>
- ---------------
(1) Excludes 860,486 shares of Common Stock issuable upon exercise of
    outstanding stock options as of June 30, 1997.
(2) Includes 27,654 shares of Common Stock that are issuable as additional
    consideration for the Company's purchase in November 1996 of certain
    minority shareholdings in Rapiscan U.S.A. See "Certain Transactions."
 
                                      16
<PAGE>
 
                                   DILUTION
 
  The net tangible book value of the Company at June 30, 1997 , was
$14,707,000 or $2.39 per share. Net tangible book value per share is
determined by dividing the net tangible book value of the Company (total
assets net of goodwill less total liabilities of the Company) by the number of
shares of Common Stock outstanding . After giving effect to the sale of
3,330,000 shares offered by the Company hereby at an assumed initial public
offering price of $13.50 per share (after deduction of estimated underwriting
discounts and commissions and estimated offering expenses), the pro forma net
tangible book value of the Company as of June 30, 1997 would have been
$55,915,000, or $5.89 per share. This represents an immediate increase in the
net tangible book value of $3.50 per share to existing shareholders and an
immediate dilution in pro forma net tangible book value of $7.61 per share to
new investors. The following table illustrates this per share dilution:
 
<TABLE>
   <S>                                                             <C>   <C>
   Assumed initial public offering price..........................       $13.50
     Net tangible book value before Offering...................... $2.39
     Increase in net tangible book value attributable to this
      Offering....................................................  3.50
                                                                   -----
   Pro forma net tangible book value after Offering...............         5.89
                                                                         ------
   Dilution to new investors......................................       $ 7.61
                                                                         ======
</TABLE>
 
  The following table sets forth on a pro forma basis as of June 30, 1997, the
number of shares of Common Stock purchased from the Company, the total
consideration paid, and the average price per share paid by the existing
shareholders and by purchasers of the shares of Common Stock offered hereby
(assuming the sale of 3,330,000 shares by the Company at an assumed initial
public offering price of $13.50 per share, before deduction of underwriting
discounts and commissions and offering expenses):
 
<TABLE>
<CAPTION>
                            SHARES PURCHASED  TOTAL CONSIDERATION
                            ----------------- ------------------- AVERAGE PRICE
                             NUMBER   PERCENT   AMOUNT    PERCENT   PER SHARE
                            --------- ------- ----------- ------- -------------
   <S>                      <C>       <C>     <C>         <C>     <C>
   Existing shareholders..  6,156,528   64.9% $ 7,367,000   14.1%    $ 1.20
   New public investors...  3,330,000   35.1   44,955,000   85.9     $13.50
                            ---------  -----  -----------  -----
    Total.................  9,486,528  100.0% $52,322,000  100.0%
                            =========  =====  ===========  =====
</TABLE>
 
  As of the date of this Prospectus, there are outstanding options to purchase
an aggregate of 860,486 of Common Stock at a weighted average exercise price
of approximately $7.34 per share. To the extent that options are exercised or
additional shares are issued, there will be further dilution to new investors.
See "Management--Stock Option Plans" and "Certain Transactions."
 
                                      17
<PAGE>
 
                     SELECTED CONSOLIDATED FINANCIAL DATA
 
  The following table sets forth for the periods and the dates indicated
certain financial data which should be read in conjunction with "Management's
Discussion and Analysis of Financial Condition and Results of Operations" and
the consolidated financial statements and notes thereto included elsewhere
herein. The statement of operations data for each of the three fiscal years in
the period ended June 30, 1997, and the balance sheet data at June 30, 1996
and 1997 are derived from the consolidated financial statements of the Company
which have been audited by Deloitte & Touche, LLP, independent accountants,
and are included elsewhere in this Prospectus. The statements of operations
data for the years ended June 30, 1993 and 1994 and the balance sheet data at
June 30, 1993, 1994 and 1995 are derived from audited financial statements not
otherwise contained herein.
 
<TABLE>
<CAPTION>
                                         YEAR ENDED JUNE 30,
                          -------------------------------------------------
                            1993      1994      1995      1996      1997
                          --------- --------- --------- --------- ---------
                            (In thousands, except share and per share data)
<S>                       <C>       <C>       <C>       <C>       <C>  
CONSOLIDATED STATEMENTS
 OF OPERATIONS DATA:
Revenues................  $  27,225 $  47,735 $  49,815   $61,518   $77,628
Cost of goods sold......     20,591    36,037    37,818    45,486    56,174
                          --------- --------- --------- --------- ---------
Gross profit............      6,634    11,698    11,997    16,032    21,454
Operating expenses:
 Selling, general and
  administrative(1).....      4,014     7,974     7,601     9,757    11,304
 Research and
  development...........      1,034     1,451     1,591     1,663     2,504
 Stock option
  compensation(2).......        --        --        --        --        856
                          --------- --------- --------- --------- ---------
 Total operating
  expenses..............      5,048     9,425     9,192    11,420    14,664
                          --------- --------- --------- --------- ---------
Income from operations..      1,586     2,273     2,805     4,612     6,790
Interest expense........        471       710     1,251     1,359     1,197
                          --------- --------- --------- --------- ---------
Income before income
 taxes and minority
 interest...............      1,115     1,563     1,554     3,253     5,593
Provision for income
 taxes..................        462       814       413     1,111     1,416
                          --------- --------- --------- --------- ---------
Income before minority
 interest...............        653       749     1,141     2,142     4,177
Minority interest.......          6        38        17       117       --
                          --------- --------- --------- --------- ---------
Net income..............       $659      $787    $1,158    $2,259    $4,177
                          ========= ========= ========= ========= =========
Net income available to
 common
 shareholders(3)(4).....       $814      $995    $1,357    $2,308    $4,269
                          ========= ========= ========= ========= =========
Net income per
 share(3)(4)(5).........      $0.13     $0.16     $0.22     $0.38     $0.68
                          ========= ========= ========= ========= =========
Weighted average shares
 outstanding(5).........  6,139,429 6,249,674 6,172,901 6,134,669 6,263,963
</TABLE>
 
<TABLE>
<CAPTION>
                                                       JUNE 30,
                                          ----------------------------------
                                           1993   1994   1995   1996   1997
                                          ------ ------ ------ ------ ------
                                                      (In thousands)
<S>                                       <C>    <C>    <C>    <C>    <C>  
CONSOLIDATED BALANCE SHEET DATA:
 Cash....................................   $941   $625 $1,405   $581   $553
 Working capital.........................  3,852  2,280 12,117  6,044 10,800
 Total assets............................ 15,739 25,807 30,780 35,309 47,333
 Total debt..............................  6,882 11,140 14,113 15,462 13,180
 Total shareholders' equity..............  2,256  3,128  4,951  7,194 16,809
</TABLE>
- -------------
(1) Fiscal 1994 includes a one time charge of $1.5 million incurred in
    connection with the settlement of a governmental proceeding. See
    "Business--Legal Proceedings."
(2) Represents a charge resulting from the acceleration of the vesting periods
    of outstanding stock options having exercise prices below the fair market
    value on the date of grant. The charge had the effect of decreasing income
    from operations, net income and net income available to common
    shareholders by $856,000, $514,000 and $514,000, respectively.
(3) Gives effect to the conversion of certain subordinated debt into preferred
    stock and Common Stock in October and November 1996, and the issuance of
    Common Stock for the purchase of the remaining minority interests in
    certain subsidiaries in October and December 1996 as if such transactions
    occurred on July 1, 1992. Adjustments in each of the five years ended June
    30, 1997 consist of: (i) the elimination of interest expense related to
    converted subordinated debt of 161, 000, 246,000, 216,000, $166,000 and
    $92,000, net of income taxes, respectively; and (ii) the elimination of
    the minority interest in the net loss of subsidiaries of 6,000, 38,000,
    17,000, $117,000 and $0, respectively.
(4) Supplementary net income for each of the five years ended June 30, 1997 is
    $936,000, $1,163,000, $1,939,000, $2,913,000 and $4,872,000, respectively,
    reflecting the reduction in interest expense, net of income taxes, from
    the effect of debt repayments discussed under "Use of Proceeds."
    Supplementary net income per share for the corresponding periods is $0.15,
    $0.18, $0.28, $0.42 and $0.68, respectively, and reflects only the
    additional shares issued to repay that debt.
(5) Assumes the conversion of 2,568,750 shares of preferred stock into
    3,853,125 shares of Common Stock as of July 1, 1992. The preferred stock
    had a liquidation preference of $1.00 per share, and was otherwise
    entitled to the same voting, dividend and all other rights as the Common
    Stock.
 
                                      18
<PAGE>
 
                     MANAGEMENT'S DISCUSSION AND ANALYSIS
               OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS
 
OVERVIEW
 
  The Company is a vertically integrated worldwide provider of devices,
subsystems and end-products based on optoelectronic technology. The Company
designs and manufactures optoelectronic devices and value added subsystems for
OEMs for use in a broad range of applications, including security, medical
diagnostics, telecommunications, office automation, aerospace, computer
peripherals and industrial automation. In addition, the Company utilizes its
optoelectronic technology and design capabilities to manufacture security and
inspection products that it markets worldwide to end users under the
"Rapiscan" brand name. These products are used to inspect baggage, cargo and
other objects for weapons, explosives, drugs and other contraband. In fiscal
1997, revenues from the sale of optoelectronic devices and subsystems amounted
to $42.9 million, or approximately 55.2% of the Company's revenues, while
revenues from sales of security and inspection products amounted to $34.7
million, or approximately 44.8% of the Company's revenues.
 
  The Company was organized in May 1987. The Company's initial products were
optoelectronic devices and subsystems sold to customers for use in the
manufacture of x-ray scanners for carry-on airline baggage. In December 1987,
the Company formed OSI Singapore to manufacture optoelectronic devices and
subsystems. In April 1990, the Company acquired United Detector Technology's
subsystem business. In February 1993, the Company acquired the Rapiscan UK
security and inspection operations and, through Rapiscan U.S.A., commenced its
operations as a provider of security and inspection products in the United
States. In April 1993, the Company acquired Ferson, a U.S. manufacturer of
passive optic components. In July 1994, the Company established OSI Malaysia
to manufacture optoelectronic subsystems as well as security and inspection
products. In March 1997, the Company acquired AME for the purpose of
broadening its optoelectronic subsystem business in Europe. The Company
currently owns all of the outstanding shares of each of these companies.
 
  In January 1994 the Company entered into a joint venture agreement with
Electronics Corporation of India, Limited ("ECIL"), an unaffiliated Indian
corporation, pursuant to which the Company and ECIL formed ECIL-Rapiscan
Security Products Limited ("ECIL Rapiscan"). The joint venture was established
for the purpose of manufacturing security and inspection products in India
from kits sold to ECIL by the Company. The Company currently owns a 36.0%
interest in ECIL Rapiscan.
 
  The Company engages in significant international operations. The Company
currently manufactures its optoelectronic devices and subsystems at its
facilities in Hawthorne, California, in Ocean Springs, Mississippi, in Johor
Bahru, Malaysia, and in Horten, Norway. Its security and inspection products
are manufactured at its facilities in Crawley, England, in Long Beach,
California, and in Johor Bahru, Malaysia. As of June 30, 1997, the Company
markets its products worldwide through approximately 42 sales and marketing
employees located in five countries, and through approximately 95 independent
sales representatives. Revenues from shipments made outside of the United
States accounted for 32.0%, 38.0%, and 42.2% of revenues for the fiscal years
1995, 1996 and 1997, respectively. Information regarding the Company's
operating income or loss and identifiable assets attributable to each of the
Company's geographic areas is set forth in Note 14 in the Company's
Consolidated Financial Statements.
 
  The effective income tax rate for the Company for fiscal 1995, 1996 and 1997
was 26.6%, 34.2% and 25.3%, respectively. Certain products manufactured in the
United States and sold overseas are sold through a Foreign Sales Corporation
("FSC") organized by the Company in 1990. Export sales made through the FSC
are subject to federal tax advantages. If the tax advantages derived from
sales made through the FSC and certain existing state and federal tax credits
remain in effect, and if certain future foreign tax benefits are received as
anticipated, the Company believes that its effective income tax rate will be
below 32.0% during the next three fiscal years.
 
 
                                      19
<PAGE>
 
  The Company's products currently address two principal markets. The
Company's optoelectronic devices and subsystems are designed and manufactured
primarily for sale to OEMs, while the Company's security and inspection
products are sold to end-users. Two principal customers of the Company's
optoelectronic devices and subsystems are the Company's Rapiscan UK and
Rapiscan U.S.A. subsidiaries. Revenues from the sale of the Company's
optoelectronic devices and subsystems to these two subsidiaries are eliminated
from the Company's reported revenues. Revenues from the Company's principal
markets and intercompany eliminations are presented in the table below.
 
<TABLE>
<CAPTION>
                                                  YEAR ENDED JUNE 30,
                                            ----------------------------------
                                             1994     1995     1996     1997
                                            -------  -------  -------  -------
                                                    (In thousands)
<S>                                         <C>      <C>      <C>      <C>
Optoelectronic devices and subsystems...... $34,729  $37,977  $45,007  $51,554
(Inter-company eliminations)...............  (1,257)  (1,529)  (6,392)  (8,675)
                                            -------  -------  -------  -------
 Unaffiliated optoelectronic devices and
  subsystems ..............................  33,472   36,448   38,615   42,879
Security and inspection products...........  14,263   13,367   22,903   34,749
                                            -------  -------  -------  -------
 Total revenues............................ $47,735  $49,815  $61,518  $77,628
                                            =======  =======  =======  =======
 
  In recent years, the Company has experienced increased revenues from its
security and inspection products, both in absolute dollars and as a percentage
of total Company revenues, a trend which the Company believes will continue.
The Company has recently initiated a program to produce larger security and
inspection products, including those for use in inspecting cargo, which
products are likely to have significantly higher selling prices than most of
the Company's products sold to date. Sales of products with higher average
selling prices may increase fluctuations in the Company's quarterly revenues
and earnings.
 
  The Company recognizes revenues upon shipment. As the Company's product
offerings change to include sales of significantly larger systems, such as
cargo inspection products, the Company may adopt the percentage of completion
method of revenue recognition for certain products.
 
RESULTS OF OPERATIONS
 
  The following table sets forth certain income and expenditure items as a
percentage of total revenues for the periods indicated:
 
<CAPTION>
                                                  YEAR ENDED JUNE 30,
                                            ----------------------------------
                                             1994     1995     1996     1997
                                            -------  -------  -------  -------
<S>                                         <C>      <C>      <C>      <C>
Revenues...................................   100.0%   100.0%   100.0%   100.0%
Cost of goods sold.........................    75.5     75.9     73.9     72.4
                                            -------  -------  -------  -------
Gross profit...............................    24.5     24.1     26.1     27.6
Operating expenses:
 Selling, general and administrative.......    16.7     15.3     15.9     14.6
 Research and development..................     3.0      3.2      2.7      3.2
 Stock option compensation.................     --       --       --       1.1
                                            -------  -------  -------  -------
  Total operating expenses.................    19.7     18.5     18.6     18.9
                                            -------  -------  -------  -------
Income from operations.....................     4.8      5.6      7.5      8.7
Interest expense...........................     1.5      2.5      2.2      1.5
                                            -------  -------  -------  -------
Income before income taxes and minority
 interest..................................     3.3      3.1      5.3      7.2
Provision for income taxes.................     1.7      0.8      1.8      1.8
                                            -------  -------  -------  -------
Income before minority interest............     1.6      2.3      3.5      5.4
Minority interest..........................     --       --       0.2      --
                                            -------  -------  -------  -------
Net income.................................     1.6%     2.3%     3.7%     5.4%
                                            =======  =======  =======  =======
</TABLE>
 
 
                                      20
<PAGE>
 
COMPARISON OF THE FISCAL YEAR ENDED JUNE 30, 1997 TO THE FISCAL YEAR ENDED
JUNE 30, 1996
 
  Revenues. Revenues consist of sales of optoelectronic devices and subsystems
as well as of security and inspection products. Revenues are recorded net of
all inter-company eliminations. Revenues for the fiscal year ended June 30,
1997 increased by $16.1 million, or 26.2%, to $77.6 million from $61.5 million
for the fiscal year ended June 30, 1996. Revenues from the sale of
optoelectronic devices and subsystems, net of inter-company eliminations,
increased by $4.3 million, or 11.0%, to $42.9 million from $38.6 million for
fiscal 1996. The increase was the result of increased orders from existing
customers, particularly in the medical diagnostics industry, and the expansion
of the Company's product base. Revenues from the sale of security and
inspection products increased by $11.8 million, or 51.7%, to $34.7 million
from $22.9 million for fiscal 1996. The increase was due mainly to the
continued acceptance of the Rapiscan Series 500 EPX System, which was
introduced in 1995, the growth in sales of the Rapiscan 119 tabletop model and
the introduction of large cargo inspection machines.
 
  Gross Profit. Cost of goods sold consists of material, labor and
manufacturing overhead. Gross profit increased by $5.4 million, or 33.8%, to
$21.5 million from $16.0 million for fiscal 1996. As a percentage of revenues,
gross profit increased to 27.6% in fiscal 1997 from 26.1% in fiscal 1996.
Gross margin increased as a result of the fact that fixed costs did not
increase proportionally with the increase in revenues. In addition, gross
profit improved as a result of the Company continuing to increase the
production of product manufactured at its offshore facilities, thereby
capitalizing on lower labor and other manufacturing costs.
 
  Selling, General and Administrative. Selling, general and administrative
expenses consist primarily of compensation paid to sales, marketing, and
administrative personnel, professional service fees, and marketing expenses.
For fiscal 1997, such expenses increased by $1.5 million, or 15.9%, to $11.3
million from $9.8 million in fiscal 1996. As a percentage of revenues,
selling, general and administrative expenses decreased to 14.6% from 15.9%.
The increase in expenses was due to increases in payroll expenses to support
revenue growth as well as to increases in legal expenses.
 
  Research and Development. Research and development expenses include research
related to new product development and product enhancement expenditures. For
fiscal 1997, such expenses increased by $841,000, or 50.6%, to $2.5 million
from $1.7 million in fiscal 1996. As a percentage of revenues, research and
development expenses increased to 3.2% from 2.7%. The increase was due
primarily to continued enhancement of the Rapiscan Series 500 EPX System and
efforts to develop products for cargo scanning. In addition, the Company
expensed all research and development expenses in the 1997 period as incurred,
whereas certain of such expenses related to software products, the
technological feasibility of which had been established, were capitalized in
the 1996 period.
 
  Income from Operations. Income from operations for fiscal 1997 increased by
$2.2 million, or 47.2%, to $6.8 million from $4.6 million for fiscal 1996.
Excluding the non-recurring non-cash incentive compensation expense of
$856,000 incurred in connection with the acceleration of the vesting period of
stock options granted to certain employees during fiscal 1997, income from
operations increased by $3.0 million, or 65.8%, to $7.6 million from $4.6
million. As a percent of revenues, income from operations increased to 8.7%
from 7.5%, and excluding the non-cash compensation expense referenced above,
it would have increased to 9.8% from 7.5%.
 
  Interest Expense. Interest expense for fiscal 1997 decreased by $162,000, or
11.9%, to $1.2 million from $1.4 million for fiscal 1996. As a percentage of
revenues, interest expense decreased to 1.5% from 2.2%. The decrease was due
to the conversion of the Company's subordinated debt to preferred and common
stock during fiscal 1997, and to a decrease in the Company's borrowings
outstanding under its lines of credit.
 
 
                                      21
<PAGE>
 
  Provision for Income Taxes. Provision for income taxes for fiscal 1997
increased by $305,000, or 27.5%, to $1.4 million from $1.1 million for fiscal
1996. As a percentage of income before provision for income taxes and minority
interest, provision for income taxes decreased to 25.3% from 34.2% in fiscal
1996. The decrease was a result of increases in the Company's export sales
through its FSC, which has the effect of reducing the tax rate on revenues
from foreign sales made from the United States, and the increased utilization
of research and development and certain state tax credits. In addition, the
Company has made the California Waters Edge election under California tax law,
which has the effect of exempting its foreign subsidiaries from California
taxes through fiscal 2003.
 
  Net Income. For the reasons outlined above, net income for fiscal 1997,
increased $1.9 million, or 84.9%, to $4.2 million from $2.3 million in fiscal
1996. The compensation charge described above, decreased net income by
$514,000 in fiscal 1997.
 
COMPARISON OF THE FISCAL YEAR ENDED JUNE 30, 1996 TO THE FISCAL YEAR ENDED
JUNE 30, 1995
 
  Revenues. Revenues for the fiscal year ended June 30, 1996 increased by
$11.7 million, or 23.5%, to $61.5 million from $49.8 million for the fiscal
year ended June 30, 1995. Revenues from the sale of optoelectronic devices and
subsystems, net of inter-company eliminations, increased by $2.2 million, or
5.9%, to $38.6 million from $36.4 million for fiscal year 1995. The increase
was the result of a 10.0% growth in sales of active optoelectronic devices and
subsystems, offset in part by a decline in sales of lenses and other passive
optic components. Revenues from the sale of security and inspection products
increased by $9.5 million, or 71.3%, to $22.9 million from $13.4 million in
the comparable 1995 period. The increase was due mainly to the increased
penetration of the U.S. security and inspection market and to larger shipments
made to two international customers.
 
  Gross Profit. Gross profit increased by $4.0 million, or 33.6%, to $16.0
million from $12.0 million for fiscal 1995. As a percentage of revenues, gross
profit increased to 26.1% from 24.1%. Gross margin increased as a result of
the Company more fully realizing the benefits of having established a
manufacturing facility in Malaysia in fiscal 1995, which had the effect of
decreasing labor rates.
 
  Selling, General and Administrative. Selling, general and administrative
expenses increased by $2.2 million, or 28.4%, to $9.8 million from $7.6
million for fiscal 1995. As a percentage of revenues, selling, general and
administrative expenses increased to 15.9% from 15.3%. The increase in
expenses was due to increases in sales and marketing activities to support the
growth in sales of security and inspection products in the United States, as
well as general increases in payroll and administration to support sales
growth.
 
  Research and Development. Research and development expenses increased by
$72,000, or 4.5%, to $1.7 million from $1.6 million for fiscal 1995. As a
percentage of revenues, research and development expenses decreased to 2.7%
from 3.2%, as increased research and development expenses related to security
and inspection products were offset in part by decreases in such expenses
related to optoelectronic products.
 
  Income from Operations. Income from operations increased by $1.8 million, or
64.4%, to $4.6 million from $2.8 million for fiscal 1995. As a percent of
revenues, income from operations increased to 7.5% from 5.6%. The increase was
due to the reasons outlined above, as both cost of goods sold and selling,
general, and administrative expenses did not increase as much as revenues
during the period.
 
  Interest Expense. Interest expense increased by $108,000, or 8.6%, to $1.4
million from $1.3 million for fiscal 1995. The increase was due to an increase
in borrowings outstanding under the Company's line of credit. As a percentage
of revenues, interest expense decreased to 2.2% from 2.5%.
 
  Provision for Income Taxes. Provision for income taxes increased by
$698,000, or 169%, to $1.1 million from $413,000 in fiscal 1995. As a
percentage of income before provision for income taxes and minority
 
                                      22
<PAGE>
 
interest, provision for income taxes increased to 34.2% in fiscal 1996 from
26.6% for the prior fiscal year. The increase resulted primarily from a
reduction in certain state income tax credits, the repeal of the federal
research and development credits, and a lower tax benefit from the Company's
FSC in fiscal 1996.
 
  Net Income. For the reasons outlined above, net income for the fiscal year
ended June 30, 1996, increased $1.1 million, or 95.1%, to $2.3 million from
$1.2 million for fiscal 1995.
 
COMPARISON OF THE FISCAL YEAR ENDED JUNE 30, 1995 TO THE FISCAL YEAR ENDED
JUNE 30, 1994
 
  Revenues. Revenues for the fiscal year ended June 30, 1995 increased by $2.1
million, or 4.4%, to $49.8 million from $47.7 million for the fiscal year
ended June 30, 1994. Revenues from the sale of optoelectronic devices and
subsystems, net of inter-company eliminations, increased by $2.9 million, or
8.9%, to $36.4 million from $33.5 million in fiscal 1994. The increase was the
result of increased sales of subsystems in most of the product markets served
by the Company. Revenues from the sale of security and inspection products
decreased by $896,000, or 6.3%, to $13.4 million from $14.3 million in fiscal
1994. The decrease was due mainly to the shipment of large orders to customers
in fiscal year 1994 that were not repeated in fiscal year 1995. Aside from the
timing of these large order shipments, base business in security and
inspection products in fiscal 1995 increased over the prior fiscal year.
 
  Gross Profit. Gross profit increased by $299,000, or 2.6%, to $12.0 million
from $11.7 million for fiscal 1994. As a percentage of revenues, gross profit
decreased to 24.1% from 24.5%. Gross margin decreased because of the start-up
expenses associated with the opening of the Company's Malaysian manufacturing
facility during fiscal 1995.
 
  Selling, General and Administrative. Selling, general and administrative
expenses decreased by $373,000, or 4.7%, to $7.6 million from $8.0 million for
fiscal 1994. As a percentage of revenues, selling, general and administrative
expenses decreased to 15.3% from 16.7%. Excluding a $1.5 million settlement
with the U.S. government which occurred in fiscal 1994, selling, general, and
administrative expenses increased by $1.1 million, or 17.4%. See "Business--
Legal Proceedings." Excluding this settlement, such expenses as a percentage
of revenues would have increased during the year from 13.6% to 15.3%. The
increase was due to increases in legal fees and other general increases
associated with revenue growth.
 
  Research and Development. Research and development expenses increased by
$140,000, or 9.6%, to $1.6 million from $1.5 million for fiscal 1994. As a
percentage of revenues, research and development expenses increased to 3.2%
from 3.0%. The increase in research and development expenses occurred
primarily due to increased expenses related to the development of security and
inspection products.
 
  Income from Operations. Income from operations increased by $532,000, or
23.4%, to $2.8 million from $2.3 million for fiscal 1994. As a percentage of
revenues, income from operations increased to 5.6% from 4.8%. The increase was
due to the decrease in selling, general, and administrative expenses in the
context of modest revenue growth.
 
  Interest Expense. Interest expense increased by $541,000, or 76.2%, to $1.3
million from $710,000 in fiscal 1994. As a percentage of revenues, interest
expense increased to 2.5% from 1.5%. The increase was due to increased
borrowings under the Company's line of credit and interest on outstanding
amounts owed under the government settlement.
 
  Provision for Income Taxes. Provision for income taxes decreased by
$401,000, or 49.3%, to $413,000 from $814,000 in fiscal 1994. As a percentage
of income before provision for income taxes and minority interest, provision
for income taxes decreased to 26.6% from 52.1%. The decrease was principally
the result of the non-deductible portion of the government settlement in
fiscal 1994.
 
  Net Income. For the reasons outlined above, net income for the fiscal year
ended June 30, 1995 increased $371,000, or 47.1%, to $1.2 million from
$787,000 for fiscal 1994.
 
                                      23
<PAGE>
 
QUARTERLY RESULTS OF OPERATIONS
 
  The following table sets forth certain statement of operations data for the
eight consecutive quarters in the period ended June 30, 1997. This data is
unaudited but, in the opinion of management, reflects all adjustments,
consisting only of normal recurring adjustments, necessary for fair
presentation of this information in accordance with generally accepted
accounting principles. The operating results for any quarter are not
necessarily indicative of results for any future period or for the entire
fiscal year.
 
<TABLE>
<CAPTION>
                                                        QUARTER ENDED
                          --------------------------------------------------------------------------
                          SEPT. 30, DEC. 31, MAR. 31,  JUNE 30, SEPT. 30, DEC. 31, MAR. 31, JUNE 30,
                            1995      1995     1996      1996     1996      1996     1997     1997
                          --------- -------- --------  -------- --------- -------- -------- --------
                                                       (In thousands)
<S>                       <C>       <C>      <C>       <C>      <C>       <C>      <C>      <C>
Revenues................   $12,539  $15,119  $17,336   $16,524   $16,530  $18,563  $20,880  $21,655
Cost of goods sold......     9,657   11,382   12,599    11,848    11,884   13,286   15,210   15,794
                           -------  -------  -------   -------   -------  -------  -------  -------
Gross profit............     2,882    3,737    4,737     4,676     4,646    5,277    5,670    5,861
Operating expenses:
 Selling, general and
  administrative........     1,879    2,126    2,740     3,012     2,737    2,686    2,760    3,121
 Research and
  development...........       419      408      453       383       517      636      584      767
 Stock option
  compensation..........       --       --       --        --        --       --       856       -
                           -------  -------  -------   -------   -------  -------  -------  -------
  Total operating
   expenses.............     2,298    2,534    3,193     3,395     3,254    3,322    4,200    3,888
                           -------  -------  -------   -------   -------  -------  -------  -------
Income from operations..       584    1,203    1,544     1,281     1,392    1,955    1,470    1,973
Interest expense........       336      345      345       333       360      331      209      297
                           -------  -------  -------   -------   -------  -------  -------  -------
Income before income
 taxes and minority
 interest...............       248      858    1,199       948     1,032    1,624    1,261    1,676
Provision for income
 taxes..................        85      293      409       324       259      408      316      433
                           -------  -------  -------   -------   -------  -------  -------  -------
Income before minority
 interest...............       163      565      790       624       773    1,216      945    1,243
Minority interest.......        19       17       (8)       89       --       --       --       --
                           -------  -------  -------   -------   -------  -------  -------  -------
Net income..............   $   182  $   582  $   782   $   713   $   773  $ 1,216  $   945  $ 1,243
                           =======  =======  =======   =======   =======  =======  =======  =======
</TABLE>
 
  The following table sets forth, as a percentage of revenues, certain
consolidated statements of operations data for the four quarters in each of
fiscal years 1996 and 1997.
 
<TABLE>
<CAPTION>
                                                        QUARTER ENDED
                          -------------------------------------------------------------------------
                          SEPT. 30, DEC. 31, MAR. 31, JUNE 30, SEPT. 30, DEC. 31, MAR. 31, JUNE 30,
                            1995      1995     1996     1996     1996      1996     1997     1997
                          --------- -------- -------- -------- --------- -------- -------- --------
<S>                       <C>       <C>      <C>      <C>      <C>       <C>      <C>      <C>
Revenues................    100.0%   100.0%   100.0%   100.0%    100.0%   100.0%   100.0%   100.0%
Cost of goods sold......     77.0     75.3     72.7     71.7      71.9     71.6     72.8     72.9
                            -----    -----    -----    -----     -----    -----    -----    -----
Gross profit............     23.0     24.7     27.3     28.3      28.1     28.4     27.2     27.1
Operating expenses:
 Selling, general and
  administrative........     15.0     14.1     15.8     18.2      16.6     14.5     13.2     14.4
 Research and
  development...........      3.3      2.7      2.6      2.3       3.1      3.4      2.8      3.5
 Stock option
  compensation..........      --       --       --       --        --       --       4.1      --
                            -----    -----    -----    -----     -----    -----    -----    -----
 Total operating
  expenses..............     18.3     16.8     18.4     20.5      19.7     17.9     20.1     17.9
                            -----    -----    -----    -----     -----    -----    -----    -----
Income from operations..      4.7      7.9      8.9      7.8       8.4     10.5      7.1      9.2
Interest expense........      2.7      2.3      2.0      2.0       2.2      1.8      1.0      1.4
                            -----    -----    -----    -----     -----    -----    -----    -----
Income before income
 taxes and minority
 interest...............      2.0      5.6      6.9      5.8       6.2      8.7      6.1      7.8
Provision for income
 taxes..................       .7      1.9      2.3      2.0       1.6      2.2      1.5      2.0
                            -----    -----    -----    -----     -----    -----    -----    -----
Income before minority
 interest...............      1.3      3.7      4.6      3.8       4.6      6.5      4.6      5.8
Minority interest.......      0.2      --      (0.1)     0.5       --       --       --       --
                            -----    -----    -----    -----     -----    -----    -----    -----
Net income..............      1.5%     3.7%     4.5%     4.3%      4.6%     6.5%     4.6%     5.8%
                            =====    =====    =====    =====     =====    =====    =====    =====
</TABLE>
 
                                      24
<PAGE>
 
  The Company's quarterly operating results have varied in the past and are
likely to vary significantly in the future. These quarterly fluctuations are
the result of a number of factors, including the volume and timing of orders
received and shipments made during the period, variations in the Company's
product mix, changes in demand for the Company's products, the timing and
amount of expenditures made by the Company in anticipation of future sales,
variability in selling price, and other competitive conditions. The Company's
revenues, particularly from the sale of security and inspection products, are
increasingly dependent upon larger orders of multiple units and upon the sale
of products having higher average selling prices. The Company is unable to
predict the timing of the receipt of such orders and, as a result, significant
variations between forecasts and actual orders will often occur. Furthermore,
the rescheduling of the shipment of any large order, or portion thereof, or
any production difficulties or delays experienced by the Company, could have a
material adverse effect on the Company's quarterly operating results.
 
LIQUIDITY AND CAPITAL RESOURCES
 
  The Company has financed its operations primarily through cash provided by
operations and through various term loans, discounting facilities, and
revolving credit lines extended to its different subsidiaries worldwide. As of
June 30, 1997, the Company's principal sources of liquidity consisted of
$553,000 in cash and several credit agreements described below.
 
  The Company's operations provided net cash of $3.4 million during fiscal
1997. For fiscal 1997, the amount of net cash provided by operations reflects
adjustments for depreciation and amortization, the increase in accounts
payable and accrued expenses and the increase in advances from customers,
which is primarily attributable to advances received on a significant security
and inspection product contract obtained in fiscal 1997. Net cash provided by
operations was offset in part by increases in receivables and inventories.
 
  Net cash used in investing activities was $3.0 million and $2.2 million in
fiscal 1997 and 1996, respectively, in each case due primarily to purchases of
property and equipment in the amount of approximately $2.2 million and $1.6
million, respectively. The Company expects to spend approximately $2.0 million
for purchases of property and equipment in fiscal 1998. In addition, the
Company may spend approximately $3.0 million if it exercises its option to
purchase its Hawthorne, California, facilities. The Company has no significant
capital spending or purchase commitments other than normal purchase
commitments and commitments under leases.
 
  Net cash used in financing activities for fiscal 1997 was $526,000 due
primarily to the repayment of debt. Net cash provided by financing activities
in fiscal 1996 was $1.4 million due to increases in borrowings under the
Company's lines of credit. The Company intends to use a portion of the net
proceeds of this Offering to repay the amounts outstanding under the Company's
lines of credit.
 
  In January 1997, OSI Systems, Inc. and its three U.S. subsidiaries entered
into a credit agreement with Sanwa Bank California. The agreement provides for
a $10.0 million line of credit, which includes revolving, letter of credit,
acceptance and foreign exchange facilities. In addition, the Company has a
$1.0 million equipment line of credit for capital purchases. At the borrowers'
election, advances under both lines of credit bear interest at a rate equal to
a variable bank reference rate plus 0.25% per annum or, at the Company's
option, at a fixed rate above LIBOR. At the borrowers' election, advances
under the equipment purchase facility bear interest at a variable bank
reference rate plus 0.25% per annum or a fixed rate quoted by the bank. The
agreement also provides for a term loan in a maximum amount of $2.5 million to
refinance existing indebtedness. At the borrowers' election, the term loan may
bear interest at a fixed or variable rate, as quoted by the bank. As of June
30, 1997, there was outstanding approximately $5.1 million under the $10.0
million line of credit, $2.4 million under the term loan, and approximately
$154,000 under the letter of credit facility. As of June 30, 1997, there were
no outstanding borrowings under the equipment line. Borrowings under the
agreement are secured by liens on substantially all of the Company's assets.
The agreement restricts the four borrowers from incurring certain additional
indebtedness and from making capital expenditures greater than $1.8 million in
the U.S. in any fiscal year. In addition, the credit agreement currently
requires that the Company at all times maintain (on a consolidated basis) a
current ratio of not less than 1.2 to 1, a tangible net worth of at least
$11.0 million, a ratio of debt to tangible net worth of not more than 3.0 to
1, and a ratio of cash, cash equivalents and accounts receivable to current
liabilities of not less than 0.6 to 1. The Company is currently in compliance
with all of these financial conditions.
 
                                      25
<PAGE>
 
  In November 1996, OSI Systems, Inc. and its three U.S. subsidiaries entered
into an agreement with Wells Fargo HSBC Trade Bank, N.A. Under the agreement
Wells Fargo will provide the four borrowers with a revolving credit line of up
to a maximum of $5.0 million to be used to pay obligations incurred in
connection with export orders. The revolving credit lines bear interest at the
bank's prime rate plus 0.25% per annum. Although the credit lines are
scheduled to expire on October 27, 1997, the bank has informed the Company
that, unless there is a material adverse change in the financial condition of
the Company, the bank intends to extend the term of the credit lines for one
additional year. As of June 30, 1997, there was outstanding approximately $1.5
million under the facility. The agreement also provides for a letter of credit
sub-facility up to an aggregate maximum of $4.0 million to be used for standby
letters of credit in support of bid and performance bonds associated with
specific foreign contracts, of which $1.9 million was used as of June 30,
1997. The facility terminates on October 27, 1997. Borrowings under the
agreement are secured by liens on certain of the Company's assets. The
agreement prohibits the Company from paying any dividends and restricts OSI
Systems, Inc. and these subsidiaries from making capital expenditures greater
than $1.8 million in the U.S. in any fiscal year.
 
  In December 1996, Midland Bank plc agreed to provide certain banking
facilities to Rapiscan UK under two agreements. Under the first agreement,
Midland agreed to provide Rapiscan UK with a pound sterling overdraft, maximum
amount of 1.2 million pounds sterling (approximately $2.1 million at June 30,
1997) outstanding at any one time, which amounts are secured by certain assets
of Rapiscan UK. Outstanding borrowings will bear interest at a base rate plus
2.00% per annum. At June 30, 1997, no amounts were outstanding under the
overdraft facility. The second agreement provides for a 750,000 pound sterling
(approximately $1.3 million as of June 30, 1997) facility for purchase of
accounts receivable at 1.85% over a base rate and a 500,000 pound sterling
(approximately $832,000 as of June 30, 1997) facility for tender and
performance bonds. These facilities are secured by certain assets of Rapiscan
UK and OSI Systems, Inc. has guarantied Rapiscan UK's obligations under the
performance bond facility. As of June 30, 1997, there was outstanding
approximately $963,000 under the line of credit and $452,000 was outstanding
under the performance bond facility. The above facilities expire in December
and November 1997, respectively.
 
  OSI Singapore has a loan agreement with Indian Bank (Singapore), which
provides for an accounts receivable discounting facility for borrowings of up
to 2.6 million Singapore dollars (approximately $1.8 million at June 30,
1997). The agreement also provides for a term loan with borrowings of 434,000
Singapore dollars (approximately $300,000 at June 30, 1997). Borrowings under
the line of credit bear interest at the bank's prime rate plus 1.50%. The line
of credit is terminable at any time. As of June 30, 1997 there was
approximately $974,000 outstanding under the line of credit and approximately
$41,000 was outstanding under the term loan. Borrowings under the line of
credit are collateralized by certain assets of OSI Singapore. The borrowings
under this line are guarantied by Messrs. Chopra, Mehra and Hickman, officers
of the Company. Borrowings secured by intercompany receivables are guarantied
by OSI Systems, Inc.
 
  AME has a loan agreement with Christiania Bank OG Kreditkasse which provides
for a revolving line of credit for borrowings of up to 5.0 million Norwegian
krone (approximately $682,000 at June 30, 1997), of which $586,000 was
outstanding as of June 30, 1997. Borrowings under the line of credit bear
interest at an annual variable rate of 6.65%. The agreement also provides for
a term loan which matures in June 2001 and bears interest at an annual rate of
5.75%. At June 30, 1997 outstanding term loan borrowings totalled
approximately 3.2 million Norwegian krone (approximately $437,000).
 
  OSI Malaysia has a bank guarantee line of credit for 2.5 million Malaysian
ringgits (approximately $1,000,000) with the Hong Kong Bank Malaysia Berhad
for performance bonds and standby letters of credit. This line expires in
October 1997.
 
  The Company believes that the net proceeds from this offering together with
cash from operations, existing cash and lines of credit will be sufficient to
meet its cash requirements for the foreseeable future.
 
                                      26
<PAGE>
 
FOREIGN CURRENCY TRANSLATION
 
  The accounts of the Company's operations in Singapore, Malaysia, England and
Norway are maintained in Singapore dollars, Malaysian ringgits, U.K. pounds
sterling and Norwegian krone, respectively. Foreign currency financial
statements are translated into U.S. dollars at current rates, with the
exception of revenues, costs and expenses, which are translated at average
rates during the reporting period. Gains and losses resulting from foreign
currency transactions are included in income, while those resulting from
translation of financial statements are excluded from income and accumulated
as a component of shareholder's equity. Transaction (losses) gains of
approximately ($19,000), $76,000, ($123,000) and $68,000 were included in
income for fiscal 1994, 1995, 1996 and 1997.
 
INFLATION
 
  The Company does not believe that inflation has had a material impact on its
results of operations.
 
                                      27
<PAGE>
 
                                   BUSINESS
 
GENERAL
 
  The Company is a vertically integrated worldwide provider of devices,
subsystems and end-products based on optoelectronic technology. The Company
designs and manufactures optoelectronic devices and value-added subsystems for
OEMs for use in a broad range of applications, including security, medical
diagnostics, telecommunications, office automation, aerospace, computer
peripherals and industrial automation. In addition, the Company utilizes its
optoelectronic technology and design capabilities to manufacture security and
inspection products that it markets worldwide to end users under the
"Rapiscan" brand name. These products are used to inspect baggage, cargo and
other objects for weapons, explosives, drugs and other contraband. In fiscal
1997, revenues from the sale of optoelectronic devices and subsystems amounted
to $42.9 million, or approximately 55.2%, of the Company's revenues, while
revenues from sales of security and inspection products amounted to $34.7
million, or approximately 44.8% of the Company's revenues.
 
INDUSTRY OVERVIEW
 
  The Company's products currently address two principal markets. The
Company's optoelectronic devices and subsystems are designed and manufactured
primarily for sale to OEMs, while the Company's security and inspection
products are sold to end-users.
 
  Optoelectronic Devices and Subsystems. Optoelectronic devices consist of
both active components, such as silicon photodiodes, that sense light of
varying wavelengths and convert the light detected into electronic signals,
and passive components, such as lenses, prisms, filters and mirrors. An
optoelectronic subsystem typically consists of one or more optoelectronic
devices that are combined with other electronic components for integration
into an end-product. Optoelectronic devices and subsystems are used for a wide
variety of applications ranging from simple functions, such as the detection
of paper in the print path of a laser printer, to complex monitoring,
measurement or positioning functions, such as in industrial robotics where the
subsystem is used to detect the exact position, motion or size of another
object. Because optoelectronic devices and subsystems can be used in a wide
variety of measurement, control and monitoring applications, optoelectronics
may be used in a broad array of industrial applications.
 
  The Company believes that in recent years advances in technology and
reductions in the cost of key components of optoelectronic systems, including
computer processing power and memory, have broadened the market by enabling
the use of optoelectronic devices in a greater number of applications. In
addition, the Company believes that there is a trend among OEMs to
increasingly outsource the design and manufacture of optoelectronic subsystems
to fully integrated, independent manufacturers who may have greater
specialization, broader expertise, and the ability and flexibility to respond
in shorter time periods than the OEM could accomplish in-house. The Company
believes that its high level of vertical integration, substantial engineering
resources, expertise in the use and application of optoelectronic technology,
and low-cost international manufacturing operations enable it to effectively
compete in the market for optoelectronic devices and subsystems.
 
  Security and Inspection Products. A variety of products are currently used
worldwide in security and inspection applications. These products include
single energy x-ray equipment, dual energy x-ray equipment, trace detection
systems that detect particulate and chemical traces of explosive materials,
and CT scanners. To date, most of these products have been deployed primarily
at commercial airports worldwide. The Company believes that the growth in the
market for security and inspection products will continue to be driven by the
increased perception of threat fueled by recent terrorist incidents, increased
government mandates and appropriations, and the emergence of a growing market
for the non-security applications of its products.
 
                                      28
<PAGE>
 
  In the 1970s, principally in response to civilian airline hijackings, the
U.S. Federal Aviation Administration ("FAA") established security standards by
setting guidelines for the screening of carry-on baggage for weapons such as
guns and knives. These standards were later mandated by the United Nations for
adoption by all of its member states. The Company believes that to date the
imposition of these standards has resulted in the installation of over 10,000
x-ray inspection systems installed in airports worldwide. Additionally, the
United Kingdom Department of Transport has required the United Kingdom's
commercial airports to deploy systems for 100% screening of international
checked baggage by the end of 1998, and the European Civil Aviation
Conference, an organization of 33 member states, has agreed to implement 100%
screening of international checked baggage by the year 2000. In the United
States, largely in response to the explosion of Pan Am Flight 103 in December
1988, Congress enacted the Aviation Security Improvement Act of 1990 which,
among other initiatives, directed the FAA to establish and implement strict
security measures and to deploy advanced technology for the detection of
various contraband, including explosives, drugs, and currency. In July 1996,
President Clinton formed the White House Commission on Aviation Safety and
Security (the "Gore Commission"), to review airline and airport security and
to oversee aviation safety. In response to the initial report released by the
Gore Commission, the United States enacted legislation that includes $144
million in appropriations for the initial deployment of advanced security and
inspection technology at major U.S. airports.
 
  X-ray inspection equipment, such as that sold by the Company, is also
increasingly being used for a number of purposes not related to security.
Newer versions of x-ray inspection equipment combine x-ray inspection with
computer image enhancement capabilities and can be applied to various non-
security purposes such as the detection of narcotics, gold and currency, the
inspection of agricultural products, and the inspection of cargo by customs
officers and international shippers. The Company believes that the market for
cargo inspection systems will increase significantly in the future.
 
GROWTH STRATEGY
 
  The Company's objectives are to be a leading provider of specialized
optoelectronic products, to enhance its position in the international
inspection and detection marketplace and to leverage its expertise in the
optoelectronic technology industry by entering into new end-product markets on
a selective basis. Key elements of this strategy include:
 
  Leverage its Optoelectronic Design and Manufacturing Expertise to Address
New Applications. The Company believes that one of its primary competitive
strengths is its expertise in designing and manufacturing specialized
optoelectronic subsystems for its OEM customers in a cost-effective manner.
The Company currently designs and manufactures devices and subsystems for over
200 customers serving over 100 applications. The Company has developed this
expertise in the past through internal research and development efforts and
through selective acquisitions. In 1990, the Company acquired UDT Sensors to
broaden its expertise and capabilities in developing and manufacturing
optoelectronic devices and subsystems. Thereafter, in 1992, the Company
acquired Ferson for its passive optic technologies, and AME in 1997 for AME's
hybrid optoelectronic capabilities. The Company intends to continue to build
this expertise in order to address a greater number of applications. By
expanding the number of potential applications its products may serve, the
Company intends to increase its business with existing customers and attract
new customers.
 
  Further Penetrate Existing Security and Inspection Markets and Expand into
Other Markets. For the year ended June 30, 1997, approximately 27.3% of the
Company's security and inspection products were sold to airports or airlines
for security purposes, with the remainder of these products being sold to
other facilities for both security and nonsecurity related purposes. The
Company intends to continue to expand its sales and marketing efforts both
domestically and internationally to capitalize on opportunities in its
existing markets for new installations as well as on opportunities to replace,
service and upgrade existing security installations. In addition, through
research and development and selective acquisitions, the Company intends to
enhance and expand its current product offering to better address new
applications including automatic bomb detection and cargo scanning. The
Company believes that this strategy will enable it to take advantage of the
 
                                      29
<PAGE>
 
growth its existing markets are experiencing and to benefit from additional
growth that these new and enhanced products will provide. The Company believes
that sales of its security and inspection products at locations other than at
airports will constitute an increasingly larger portion of its sales in the
future.
 
  Capitalize on Vertical Integration. The Company believes it offers
significant added value to its OEM customers by providing a full range of
vertically integrated services including component design and customization,
subsystem concept design and application engineering, product prototyping and
development, and efficient pre-production, short-run and high volume
manufacturing. The Company believes that its vertical integration
differentiates it from many of its competitors and provides value to its OEM
customers who can rely on the Company to be an integrated supplier of an
optoelectronic subsystem. In addition, the Company's vertical integration
provides several other advantages in both its optoelectronic devices and
subsystems and security and detection product lines. These advantages include
reduced manufacturing and delivery times, lower costs due to its access to
competitive international labor markets and direct sourcing of raw materials,
and superior quality control. The Company intends to continue to leverage its
vertically integrated services to create greater value for its customers in
the design and manufacturing of its products. The Company believes that this
strategy better positions the Company for penetration into other end markets.
 
  Capitalize on Global Presence. The Company operates in three locations in
the United States, three in Europe and two in Asia. The Company views its
international operations as providing an important strategic advantage over
competitors in both the optoelectronic device and subsystem market and the
security and inspection market for three primary reasons. First, international
manufacturing facilities allow the Company to take advantage of competitive
labor rates in order to be a low cost producer. Second, its international
offices strengthen its sales and marketing efforts and its ability to maintain
and repair its systems by providing direct access to growing foreign markets
and to its existing international customer base. Third, multiple manufacturing
locations allow the Company to reduce delivery times to its global customer
base. In the future, the Company intends to develop new sources of
manufacturing and sales capabilities to maintain and enhance the benefits of
its international presence.
 
  Selectively Enter New End Markets. The Company intends to selectively enter
new end markets that complement its existing capabilities in designing,
developing and manufacturing optoelectronic devices and subsystems. The
Company believes that by manufacturing other end products which rely on the
technological capabilities of the Company, it can leverage its existing
integrated design and manufacturing infrastructure to capture greater margins
and build a significant presence in new end markets which present attractive
competitive market dynamics. The Company intends to achieve this strategy
through internal growth or through selective acquisitions of end-product
manufacturers.
 
PRODUCTS AND TECHNOLOGY
 
  The Company designs, develops, manufactures and sells products based on its
core optoelectronic technology. These products range from discrete devices to
value-added subsystems to complete x-ray security and inspection products.
 
  Discrete Devices and Subsystems. Optoelectronic devices generally consist of
both active and passive components. Active components sense light of varying
wavelengths and convert the light detected into electronic signals, whereas
passive components amplify, separate or reflect light. Active components
manufactured by the Company consist of silicon photodiodes and hybrid
photodetectors. Passive components include lenses, prisms, filters, mirrors
and other precision optical products that are used by the Company in the
manufacture of its optoelectronic products or are sold to others for use in
telescopes, laser printers, copiers, microscopes and other detection and
vision equipment. The devices manufactured by the Company are both standard
products and products customized for specific applications. Most of the
devices manufactured by the Company are incorporated by it into the subsystems
that it manufactures. The Company
 
                                      30
<PAGE>
 
does, however, also sell its discrete devices separately to OEMs. Direct sales
of devices to third parties constituted less than 10.0% of the Company's
revenues in fiscal 1997.
 
  In addition to the manufacture of discrete devices, the Company also
specializes in designing and manufacturing customized optoelectronic
subsystems for use in a wide range of products and equipment. An
optoelectronic subsystem typically consists of one or more optoelectronic
devices that are combined with other electronic components and packaging for
use in an end-product. The composition of a subsystem can range from a simple
assembly of various optoelectronic devices that are incorporated into other
subsystems (for example, a printed circuit board containing the Company's
optoelectronic devices), to complete end-products (for example, medical pulse
oximeter probes that are manufactured and packaged by the Company on behalf of
the OEM customer and then shipped directly to the customer or the customer's
distributors). Since the end of fiscal 1996, the Company has manufactured
subsystems for a variety of applications, including the following: imaging
electronics for medical CT scanners; disposable and reusable medical probes
for use with medical pulse oximetry equipment; components and subsystems for
laser gyroscopes used in military and commercial aviation; optoelectronic
subsystems for slot machines; laser subsystems in military helicopter gun
sighting equipment; positioning subassemblies for computer peripheral
equipment; alignment subsystems for laser heads in optical disc players; and
ultra-violet fire detection subsystems for submarines and surface ships.
 
  Security and Inspection Equipment. The Company manufactures and sells a
range of security and inspection equipment that it markets under the
"Rapiscan" brand name. To date, the security and inspection equipment has
principally been used at airports to inspect carry-on and checked baggage for
guns and knives. However, inspection products are increasingly being used for
both security purposes at a wide range of facilities other than airports and
for other non-security purposes. For fiscal years 1995, 1996, and 1997
approximately 28.7%, 33.1%, and 27.3% respectively, of the Company's security
and inspection revenues were derived from the sale of inspection products to
airlines and airports, and the balance of such revenues were derived from all
other sales. The Company believes that sales of its inspection products for
use at non-airport locations will constitute an increasingly larger portion of
future revenues.
 
  The Company's inspection and detection products combine the use of x-ray
technology with the Company's core optoelectronic capabilities. The base
models of its product line use single energy x-ray technology and are used for
identifying weapons with distinct shapes, such as guns and knives. The
Company's enhanced models combine dual- or multi-energy x-ray technology with
computer enhanced imaging technology to facilitate the detection of materials
such as explosives, narcotics, currency or other contraband. While all x-ray
systems produce a two-dimensional image of the contents of the inspected
material, the dual-energy x-ray systems also measure the x-ray absorption of
the inspected materials' contents at two x-ray energies to determine the
atomic number, mass and other characteristics of the object's contents. The
different organic and non-organic substances in the inspected material are
displayed in various colors. This information is then displayed to an operator
of the inspection equipment who can identify and differentiate the objects in
the inspected materials.
 
  Currently, all of the Company's inspection products require an operator to
monitor the images produced by the inspection equipment. Depending on the
model, the Company's products permit the operator to inspect the contents of
packages at varying image modes and magnifications. The images range from the
monochrome and pseudo-color images produced by single x-ray imaging systems,
to high resolution, multi-color images in the Company's computer enhanced
dual-energy models. The Company believes that its Rapiscan 500 Series provides
one of the highest quality images currently available in the x-ray security
and inspection industry.
 
  In order to monitor the performance of operators of the x-ray baggage
screening systems that are used in the United States airports, the FAA has
implemented a computer-based training and evaluation program known as the
Screener Proficiency Evaluation And Reporting System ("SPEARS"). The Company's
Rapiscan 500 Series EPX System is, to date, the only system that meets the
FAA's SPEARS criteria. In order to test the proficiency and attentiveness of
the operator, the Company's system is able to insert test threat images, such
as weapons, into an actual parcel stream by use of computer images.
 
                                      31
<PAGE>
 
The following table sets forth certain information related to the standard
security and inspection products currently offered by the Company. The Company
does, however, also customize its standard products to suit specific
applications and customer requirements:
 
<TABLE>
<CAPTION>
        MODEL (TECHNOLOGY)              APPLICATIONS                SELECTED INSTALLATIONS
- ----------------------------------------------------------------------------------------------
  <S>                        <C>                                <C>
  Rapiscan 19 (single en-    Inspection of incoming package     Embassies
   ergy)
  Rapiscan 119 (single en-                                      Post offices
   ergy)
                                                                Courthouses
                                                                High risk office buildings
                                                                Manufacturing companies
- ----------------------------------------------------------------------------------------------
  Rapiscan 300 Series (160   Inspection of hand carried baggage Airports
  kV x-ray  source,                                             Prisons
  single energy and                                             Government buildings
   dual energy)                                                 Nuclear facilities
- ----------------------------------------------------------------------------------------------
  Rapiscan 500 Series-       Airport hand carried and checked   Airports
  Standard                    baggage                           Cruise ships
   Tunnel (single view and   Pallet inspection                  Freight shippers
  dual                       Customs inspections                Border crossings
   view 160 kV x-ray         Agriculture inspection
  source, single
   energy and dual energy)
- ----------------------------------------------------------------------------------------------
  Rapiscan 500 Series-       Large pallet inspection            Airports
  Large Tunnel               Customs inspections                Freight shippers
   (single view and dual                                        Border crossings
  view                                                          High risk seaport locations
   320-450 kV x-ray
  source)
- ----------------------------------------------------------------------------------------------
  Rapiscan 500 Series-Mo-    Mobile x-ray inspection            Conventions and special events
  bile                                                          Airports
   Systems (x-ray van or                                        Customs inspections
  trailer)                                                      Border crossing
</TABLE>
 
  In addition to its x-ray security and inspection products, the Company also
markets three models of an archway walk-through metal detector and two models
of a hand-held metal detector. These products are used to detect metal weapons
such as guns and knives and are installed at airports and other locations,
including prisons and schools. During fiscal 1997, sales of the walk-through
and hand-held metal detectors constituted 1.6% of the Company's revenues.
 
  The Company's Rapiscan U.S.A. subsidiary has entered into a non-exclusive
patent license agreement with EG&G Inc. Under the license, Rapiscan U.S.A. is
permitted to make, use and sell or otherwise dispose of security and
inspection products that use an x-ray line scan system for baggage inspection
purposes covered by EG&G Inc.'s patent. The patent, which expires in 2000,
does not affect sales of the Company's security and inspection products
manufactured and sold outside of the United States.
 
                                      32
<PAGE>
 
MARKETS, CUSTOMERS AND APPLICATIONS
 
  Optoelectronic Devices and Subsystems. The Company's optoelectronic devices
and subsystems are used in a broad range of products by a variety of
customers. The following chart illustrates, for the year ended June 30, 1997:
(i) the major product categories for which the Company provided optoelectronic
products; (ii) the percentage of revenues from the sale of optoelectronic
devices and subsystems related to such categories; (iii) certain customers
("Major Customers") in each such category who purchased more than $100,000 of
optoelectronic products; and (iv) the total number of Major Customers in each
such category. The Company expects that the list of product categories, the
amount of business derived from each such product category, and the
composition of its major customers will vary from period to period.
 
<TABLE>
<CAPTION>
                          PERCENTAGE OF      REPRESENTATIVE
                          OPTOELECTRONIC          MAJOR          APPROXIMATE NUMBER
    PRODUCT CATEGORY          SALES             CUSTOMERS        OF MAJOR CUSTOMERS
    ----------------      -------------- ----------------------- ------------------
<S>                       <C>            <C>                     <C>
Computed Tomography and
 X-Ray Imaging                 23.3%     Picker International             7
                                         Hologic, Inc.
                                         InVision Technologies

Aerospace and Avionics         12.3%     Kearfott Guidance               10
                                         Honeywell Avionics
                                         Litton Systems

Medical Monitoring             12.1%     Datascope                        8
                                         BioChem International
                                         Criticare Systems
Analytical, Medical
 Diagnostics, and
 Particle Analyzers             6.9%     Johnson & Johnson               10
                                         Leica
                                         Coulter Corporation

Office Automation and           7.6%     Xerox                            8
 Computer Peripherals                    Eastman Kodak
                                         Dr. Johannes Heidenhain

Construction, Robotics          6.2%     3M                               7
 and Industrial                          Spectra Physics
 Automation                              Baumer Electric

Military/Defense and            5.1%     Lockheed Martin (Loral)          7
 Weapons Simulations                     Hughes (HDOS)
                                         Texas Instruments

Bar Code Scanners               3.6%     Symbol Technologies              3
                                         Intermec
                                         United Barcode Industries 
                                          (Singapore)

Gaming Industry                 2.1%     Bally Gaming                     2
                                         Ardac, Inc.
</TABLE>
 
                                      33
<PAGE>
 
  Security and Inspection Products. Since entering the security and inspection
products market in 1993, the Company has shipped over 2,000 units to over 50
countries. The Company has sold 10 or more of its security and inspection
products, or more than $100,000 of such products, in at least 26 countries.
The following is a list of certain customers and/or installations that have
purchased at least 10 units, or more than $100,000, of the Company's security
and inspection products since January 1993:
 
<TABLE>
  <S>                                             <C>
  Nanjing Airport; People's Republic of
   China                                          Ukraine Airports; Ukraine

  Prague Airport; Czech Republic                  United Kingdom Prison System; United Kingdom

  Gatwick Airport; England                        American Airlines; U.S.A

  Heathrow Airport; England                       Continental Airlines; U.S.A

  TNT Freight; England                            Delta Airlines; U.S.A.

  Finnish Customs; Finland                        Federal Courthouses; U.S.A.

  Malaysian Airport Board; Malaysia               Federal Reserve Bank; U.S.A.

  New Zealand Customs; New Zealand                JFK International Terminal; U.S.A.

  Pakistan Airports; Pakistan                     Los Angeles County Courthouse; U.S.A.

  Doha International Airport; Qatar               Miami Airport; U.S.A.

  HAJ Terminal; Saudi Arabia                      Orlando Airport; U.S.A.

  Spanish Radio/Television; Spain                 USAir; U.S.A.


  Sri Lanka Government; Sri Lanka                 Japanese Embassies; Worldwide
  Dubai Airport; U.A.E.
</TABLE>
 
  Because the market for most security and inspection products developed in
response to civilian airline hijackings, historically a large portion of the
Company's security and inspection products were sold for use at airports.
Recently, however, the Company's security and inspection products have been
used for security purposes at locations other than airports, such as
courthouses, government buildings, mail rooms, schools, prisons and at unique
locations such as Buckingham Palace, England. In addition, the Company's
security and inspections products are increasingly being used for non-security
purposes, such as for cargo inspection to detect narcotics and contraband,
prevention of pilferage at semiconductor manufacturing facilities, quality
assurance for agricultural products, and the detection of gold and currency.
 
MARKETING, SALES AND SERVICE
 
  The Company markets and sells its optoelectronic devices and subsystems
worldwide through both a direct sales and marketing staff of 23 employees and
indirectly through a network of approximately 23 independent sales
representatives and distributors, as of June 30, 1997. Most of the in-house
sales staff is based in the United States while most of the independent sales
representatives and distributors are located abroad. Since the acquisition of
AME in March 1997, the Company's marketing efforts in Europe have been
conducted through AME's sales and marketing staff and through a network of
approximately four independent sales representatives. The Company markets and
sells its security and inspection products worldwide through a direct sales
and marketing staff of approximately 19 employees located in the United
States, the United Kingdom, Dubai, and Malaysia and through a network of over
72 independent sales representatives, as of June 30, 1997. Following this
Offering, the Company intends to expand its direct sales force.
 
  The Company's optoelectronic products sales staff located in the United
States and Norway is supported by an applications engineering group whose
members are available to provide technical support. This support includes
designing applications, providing custom tooling and process integration,
defining solutions for customers and developing products that meet customer
defined specifications. The security and inspection
 
                                      34
<PAGE>
 
products sales staff is supported by a service organization of approximately
23 persons, as of June 30, 1997, located primarily in the United States, the
United Kingdom and Malaysia. The Company also supports these sales and
customer relations efforts by providing operator training, computerized
training and testing equipment, in-country service, software upgrades, service
training for customer technicians and a newsletter on security issues.
 
  The Company considers its maintenance service operations to be an important
element of its business. After the expiration of the standard one-year product
warranty period, the Company is often engaged by its customers to provide
maintenance services for its security and inspection products through annual
maintenance contracts. The Company believes that its international maintenance
service capabilities give it a competitive advantage in selling its security
and inspection products. Furthermore, the Company believes that as its
installed base of security and inspection products increases, revenues
generated from such annual maintenance service contracts and from the sale of
replacement parts will increase. In fiscal 1996 and 1997, maintenance service
revenues and replacement part sales collectively represented 3.3% and 3.6%,
respectively, of the Company's revenues.
 
RESEARCH AND DEVELOPMENT
 
  The Company's components and optoelectronic subsystems are designed and
engineered at the Company's offices in either Hawthorne, California, or
Horten, Norway. The subsystems that the Company manufactures are engineered by
the Company to solve specific application needs of its OEM customers. The
Company's customers typically request that the Company design custom
optoelectronic solutions for their specific needs when standard components or
subsystems are not available from other manufacturers of optoelectronic
devices. After an end-product has been conceptualized by the OEM, the Company
normally will involve its engineers to design the application, to establish
the mechanical specifications for the application, to create the appropriate
subsystem architecture for the application, and to design the development,
production, and assembly process for the manufacture of the ultimate
subsystem. However, because the Company has the engineering, tooling and
manufacturing capabilities to design and manufacture entire subsystems, and
not just a specific component, the Company typically also designs,
manufactures and assembles the entire subsystem for the customer. Because the
Company's engineers are able to provide additional value and services to its
customers through the entire production process from concept to completion,
the Company considers its engineering personnel to be an important extension
of its core sales and marketing effort.
 
  In addition to close collaboration with the Company's customers in the
design and development of optoelectronics-based products, the Company
maintains an active program for the development and introduction of new
products and enhancements and improvements to its existing products, including
the implementation of new applications of its technology. The Company seeks to
further develop its research and development program and considers such
program to be an important element of its business and operations. As of June
30, 1997, in addition to the engineers that the Company employed in
manufacturing, process design and applications development, the Company
engaged approximately 33 full-time engineers and technicians in research and
development. During the fiscal 1994, 1995, 1996 and 1997, the Company's
research and development expenses were approximately $1.5 million, $1.6
million, $1.7 million and $2.5 million, respectively. In order to fulfill its
strategy of increasing its security and inspection product lines and of
enhancing the capabilities of its existing products, the Company intends to
increase its research and development efforts in the future.
 
MANUFACTURING AND MATERIALS MANAGEMENT
 
  The Company currently has manufacturing facilities in the United Kingdom,
Malaysia and Norway in addition to its manufacturing facilities in Hawthorne,
California, Long Beach, California, and Ocean Springs, Mississippi. The
Company's principal manufacturing facility is in Hawthorne, California.
However, most of the Company's high volume, labor intensive manufacturing and
assembly is generally performed at its facilities
 
                                      35
<PAGE>
 
in Malaysia. Since most of the Company's customers currently are located in
Europe, Asia and the United States, the Company's ability to assemble its
products in these markets and provide follow-on service from offices located
in these regions is an important component of the Company's global strategy.
 
  The Company seeks to focus its subsystem manufacturing resources on its core
competencies that enable it to provide value-added enhancements and
distinctive value. The Company believes that its manufacturing organization
has expertise in optoelectronic, electrical and mechanical manufacturing and
assembly of products for commercial applications and for high reliability
applications. High reliability devices and subsystems are those which are
designed, manufactured, screened and qualified to function under exceptionally
severe levels of environmental stress. See "Legal Proceedings." The
manufacturing techniques include silicon wafer processing and fabrication,
manufacture and assembly of photodiodes, SMT (surface mounting) and manual
thru-hole assembly, thick-film ceramic processing, wire bonding, molding,
assembly of components, testing, and packaging. The Company also has the
ability to manufacture plastic parts and certain other parts that are either
not available from third party suppliers or that can be more efficiently or
cost-effectively manufactured in-house. The Company outsources certain
manufacturing operations including its sheet metal fabrication. The
manufacturing process for components and subsystems consists of manual tasks
performed by skilled and semi-skilled workers as well as automated tasks. The
number of subsystems that the Company manufacturers depends on the customers'
needs and may range from a few subsystems (such as an optoelectronic sun
sensor for use in a satellite) to many thousands (sensors used in laser
printers and bar code readers).
 
  The principal raw materials and subcomponents used in producing the
Company's optoelectronic devices and subsystems consist of silicon wafers,
ceramics, electronic subcomponents, light emitting diodes, phototransistors,
printed circuit boards, headers and caps, housings, cables, filters and
packaging materials. For cost, quality control and efficiency reasons, the
Company generally purchases raw materials and subcomponents only from single
vendors with whom the Company has on-going relationships. The Company does,
however, qualify second sources for all of its raw materials and
subcomponents, or has identified alternate sources of supply. The Company
purchases the materials pursuant to purchase orders placed from time to time
in the ordinary course of business with procurement commitment terms ranging
from three months to one year at fixed costs but has no guaranteed long-term
supply arrangements with such suppliers. The silicon-based optoelectronic
devices manufactured by the Company are critical components in most of its
subsystems. Since 1987, the Company has purchased substantially all of the
silicon wafers it uses to manufacture its optoelectronics devices from Wacker
Siltronic Corp. Although to date the Company has not experienced any
significant shortages or material delays in obtaining any of its raw materials
or subcomponents, there can be no assurance that the Company will not face
such shortages or delays in one or more of these materials in the future. See
"Risk Factors--Availability of Raw Materials and Components."
 
  Substantially all of the optoelectronic subsystems, circuit boards and x-ray
generators used in the Company's inspection and detection systems are
manufactured in-house. The metal shells of the x-ray inspection systems, and
certain standard mechanical parts are purchased from various third-party
unaffiliated providers.
 
ENVIRONMENTAL REGULATIONS
 
  The Company is subject to various federal, state and local environmental
laws, ordinances and regulations relating to the use, storage, handling, and
disposal of certain hazardous substances and wastes used or generated in the
manufacturing and assembly of the Company's products. Under such laws, the
Company may become liable for the costs of removal or remediation of certain
hazardous substances that have been or are being released on or in its
facilities or that have been or are being disposed of off site as wastes. Such
laws may impose liability without regard to whether the Company knew of, or
caused, the release of such hazardous substances. In the past, the Company has
conducted a Phase I environmental assessment report for each of the properties
in the United States at which it currently manufactures products. The purpose
of each such report was to identify, as of the date of that report, potential
sources of contamination of the property. In
 
                                      36
<PAGE>
 
certain cases, the Company has received a Phase II environmental assessment
report consisting of further soil testing and other investigations deemed
appropriate by an independent environmental consultant. The Company believes
that it is currently in compliance with all material environmental regulations
in connection with its manufacturing operations, and that it has obtained all
environmental permits necessary to conduct its business. The amount of
hazardous substances and wastes produced and generated by the Company may
increase in the future depending on changes in the Company's operations. Any
failure by the Company to comply with present or future regulations could
subject the Company to the imposition of substantial fines, suspension of
production, alteration of manufacturing process or cessation of operations,
any of which could have a material adverse effect on the Company's business,
financial condition and results of operations. For a discussion of the risks
imposed upon the Company's business by environmental regulations, see "Risk
Factors--Environmental Regulation."
 
COMPETITION
 
  The markets in which the Company operates are highly competitive and are
characterized by evolving customers needs and rapid technological change. The
Company competes with a number of other manufacturers, many of which have
significantly greater financial, technical and marketing resources than the
Company. In addition, these competitors may have the ability to respond more
quickly to new or emerging technologies, may adapt more quickly to changes in
customer requirements, may have stronger customer relationships, may have
greater name recognition, and may devote greater resources to the development,
promotion and sale of their products than the Company. There can be no
assurance that the Company will be able to compete successfully against any
current or future competitors in either the optoelectronic devices and
subsystem markets or the security and inspection markets or that future
competitive pressures will not materially and adversely affect its business,
financial conditions and results of operations.
 
  In the optoelectronic device and subsystem market, competition is based
primarily on such factors as expertise in the design and development of
optoelectronic devices, product quality, timeliness of delivery, price,
customer technical support, and on the ability to provide fully integrated
services from application development and design through volume subsystem
production. The Company believes that its major competitors in the
optoelectronic device and subsystem market are EG&G Electro-Optics, a division
of EG&G, Inc., Optek Technology Inc., Hamamatsu Corporation, and Honeywell
Optoelectronics, a division of Honeywell, Inc. Because the Company specializes
in custom subsystems requiring a high degree of engineering expertise, the
Company believes that it generally does not compete to any significant degree
with any other large United States, European or Far Eastern manufacturers of
standard optoelectronic components.
 
  In the security and inspection market, competition is based primarily on
such factors as product performance, functionality and quality, the over-all
cost effectiveness of the system, prior customer relationships, technological
capabilities of the products, price, local market presence, and breadth of
sales and service organization. The Company believes that its principal
competitors in the market for security and inspection products are EG&G
Astrophysics, a division of EG&G, Inc., Heimann Systems GmbH, InVision
Technologies, Inc., Vivid Technologies, American Science and Engineering,
Inc., Barringer Technologies Inc., Control Screening L.L.C., and Thermedics
Detection, Inc. Competition could result in price reductions, reduced margins,
and loss of market share by the Company. In the airline and airport security
and inspection market, particularly in the upgrade and replacement market, the
Company also competes for potential customers based on existing relationships
between its competitors and the customers. Certain of the Company's
competitors have been manufacturing inspection systems since the 1980's and
have established strong relationships with airlines and airport authorities.
The Company believes that the image quality and resolution of certain of its
security and inspection products is superior to the image quality offered by
most of its competitors' x-ray based inspection products. Although the Company
also has established relationships with a number of airport and airline
customers, no assurance can be given that the Company will be able to
successfully compete in the future with existing competitors or with new
entrants.
 
 
                                      37
<PAGE>
 
BACKLOG
 
  The Company measures its backlog as orders for which purchase orders or
contracts have been signed, but which have not yet been shipped and for which
revenues have not yet been recognized. The Company typically ships its
optoelectronics devices and subsystems as well as its security and inspection
products within one to three months after receiving an order. However, such
shipments may be delayed for a variety of reasons including any special design
or engineering requirements of the customer. In addition, large orders (more
than 10 machines) of security and inspection products typically require more
lead time. Large cargo scanning machines require six to twelve months lead
time.
 
  At June 30, 1997, the Company's backlog products totalled approximately
$52.7 million, compared to approximately $30.0 million at June 30, 1996.
Substantially all of the Company's backlog as of June 30, 1997 is expected to
be shipped during the fiscal year ending June 30, 1998. Any failure of the
Company to meet an agreed upon schedule could lead to the cancellation of the
related order. Variations in the size of the order, the product mix, and
delivery requirements of the customer order may result in substantial
fluctuations in backlog from period to period. Backlog as of any particular
date should not be relied upon as indicative of the Company's revenues for any
future period and cannot be considered a meaningful indicator of the Company's
performance on an annual or quarterly basis.
 
EMPLOYEES
 
  As of June 30, 1997, the Company employed approximately 725 people, of whom
565 were employed in manufacturing, 33 in research and development, 62 in
finance and administration, 42 in sales and marketing, and 23 in its service
organization. Of the total employees, approximately 453 were employed in the
United States, 109 were employed in Europe, 162 were employed in Asia, and one
employee was employed in the Middle East. Nine employees at AME are members of
a union and have collective bargaining rights. Other than the employees of
AME, none of the Company's other employees are unionized. There has never been
a work stoppage or strike at the Company, and management believes that its
relations with its employees are good.
 
FACILITIES
 
  The Company currently leases all of its facilities with remaining lease
terms ranging from one to 14 years as reflected in the following table:
 
<TABLE>
<CAPTION>
                                                                     APPROXIMATE
                                                                       SQUARE      LEASE
LOCATION                           DESCRIPTION OF FACILITY             FOOTAGE   EXPIRATION
- --------                           -----------------------           ----------- ----------
<S>                                <C>                               <C>         <C>
  Hawthorne, California            Executive offices, manufacturing,   61,700       2005
                                   engineering, sales and marketing

  Long Beach, California           Manufacturing, engineering, sales   26,200       1998
                                   and marketing and service

  Ocean Springs, Mississippi       Manufacturing, engineering and      41,800       2001
                                   sales and marketing

  Johor Bahru, Malaysia            Manufacturing and sales             13,500       1997

  Johor Bahru, Malaysia            Manufacturing                       10,500       1998

  Horten, Norway                   Manufacturing, engineering,         18,200       1999
                                   marketing and sales

  Singapore, Republic of           Administrative and materials         3,000       2000
   Singapore                       procurement

  Crawley, United Kingdom          Manufacturing, engineering, sales   11,900       2011
                                   and marketing

  Hayes, United Kingdom            Service                              3,900       2003
</TABLE>
 
 
                                      38
<PAGE>
 
  The Company believes its facilities are in good condition and are adequate
to support its operations for the foreseeable future. The Company currently
anticipates that it will be able to renew the leases that are scheduled to
expire in the next few years on terms substantially the same as currently in
effect. However, even if the Company were not able to renew one or more of the
leases, the Company believes that suitable substitute space is available to
relocate any of the facilities where the lease is not renewed. Accordingly,
the Company does not believe that its failure to renew any of the leases that
are scheduled to expire in the next few years will have a material adverse
effect on the Company's operations.
 
  The Company has an option to purchase the Hawthorne, California, facility
for a base price of approximately $3.0 million. The option is exercisable by
the Company upon prior written notice of six months to the landlord at any
time during the term of the lease. After October 1999, the option purchase
price will be increased each year by the percentage increase in the Consumer
Price Index as calculated by the United States Department of Labor for urban
consumers in the Los Angeles area. In addition to the option to purchase, the
Company also has a right of first refusal to purchase the Hawthorne facility
in the event that the landlord entertains a third party offer to buy the
facility.
 
LEGAL PROCEEDINGS
 
  On January 21, 1997, Rapiscan U.S.A. filed a complaint in the U.S. District
Court for the Central District of California against Lunar in response to
claims by Lunar that certain security inspection products produced by Rapiscan
U.S.A. infringe the '688 patent, which patent is owned by UAB and licensed
exclusively to Lunar. The complaint seeks a declaratory judgment that the
products produced by Rapiscan U.S.A. do not infringe the '688 patent, that the
'688 patent is invalid, and that the patent may not be enforced against
Rapiscan U.S.A. for a number of equitable and legal reasons. The complaint
also asserts related nonpatent claims including fraud and the breach of an
oral agreement whereby Lunar would compensate Rapiscan U.S.A. for assisting
Lunar in its enforcement of the '688 patent and seeks compensatory and
punitive damages for these claims.
 
  On January 23, 1997, Lunar and UAB, filed suit against OSI Systems, Inc.,
Rapiscan U.S.A. and UDT Sensors in the U.S. District Court for the Western
District of Wisconsin. Lunar and UAB asserted patent infringement,
contributory infringement and inducement thereof. Lunar and UAB seek damages
in an unspecified amount and an injunction preventing OSI Systems, Inc.,
Rapiscan U.S.A. and UDT Sensors from further making, using, selling and
offering for sale products including the dual energy detector allegedly
covered by the '688 patent. The Wisconsin lawsuit has been transferred to the
U.S. District Court for the Central District of California and has been
consolidated with the lawsuit brought by Rapiscan U.S.A.
 
  OSI Systems, Inc., Rapiscan U.S.A. and UDT Sensors moved for partial summary
judgment on the scope of claims 38 and 39 of the '688 patent, which are
presently the only claims being asserted by Lunar and UAB. In July 1997, the
court granted the motion for partial summary judgment and ordered that (1)
claim 38 is construed to require that the scintillator material of the first
detector element is a different material than the scintillator material of the
second element, (2) claim 38 is construed to require the use of an area beam,
and (3) claim 39 is construed to require that the phosphor material and
primary radiation absorber in the first detector element are different
materials than the phosphor material and primary radiation absorber in the
second detector element. The issue of whether claims 38 and 39, as now
construed, can cover the Company's specific products was not before the court.
However, because the Company's products use only the same scintillator
materials and use only fan beams, the Company believes that the likelihood of
Lunar and UAB prevailing in its patent infringement lawsuit against the
Company is remote. No assurance can be given that the Company will be
successful in this lawsuit. See "Risk Factors--Proprietary Technology; Pending
Litigation." The Company intends to continue its defense against Lunar's and
UAB's claims and to vigorously pursue its claims against Lunar.
 
  In October 1994, UDT Sensors, one of the Company's subsidiaries, entered
into a Consent Judgment and a Criminal Plea and Sentencing Agreement
(collectively, the "Consent Agreements") with the United States of America.
The charges contained in the Consent Agreements relate to high-reliability
optoelectronic subsystems that UDT Sensors manufactured for use in military
aircraft, attack helicopters and submarines. In
 
                                      39
<PAGE>
 
the Consent Agreements, UDT Sensors agreed that it had not tested 100% of
these products as required by the applicable military specifications. Under
the terms of the Consent Agreements, UDT Sensors agreed to pay a total of $1.5
million, plus interest, in five annual installments ending on March 31, 1999.
UDT Sensors was placed on probation for the five-year period ending March 31,
2000 with respect to sales of optoelectronic subsystems for use by the U.S.
Department of Defense. Probation does not, however, prohibit UDT Sensors from
selling optoelectronic products to the United States, and UDT Sensors has,
since the date of the Consent Agreements, continued to manufacture and sell
the same optoelectronic products for use in military aircraft, attack
helicopters and submarines. In addition, in order to ensure that UDT Sensors
complies with all Federal procurement laws, UDT Sensors agreed to implement
programs and practices to establish and monitor complying contracting
procedures, and agreed to file periodic reports evidencing such practices and
programs.
 
                                      40
<PAGE>
 
                                  MANAGEMENT
 
EXECUTIVE OFFICERS AND DIRECTORS
 
  The following sets forth certain information regarding the Company's
executive officers and directors:
 
<TABLE>
<CAPTION>
           NAME          AGE                            POSITION
           ----          ---                            --------
<S>                      <C> <C>
  Deepak Chopra......... 46  Chairman of the Board, Chief Executive Officer and President

  Ajay Mehra............ 34  Vice President, Chief Financial Officer, Secretary and Director

  Andreas F. Kotowski... 42  President of U.S. Operations, Rapiscan U.S.A.

  Manoocher Mansouri
   Aliabadi............. 41  Vice President - Corporate Marketing, UDT Sensors

  Anthony S. Crane...... 43  Managing Director, Rapiscan UK

  Thomas K. Hickman..... 55  Managing Director, OSI Singapore and OSI Malaysia

  Steven C. Good(1)..... 55  Director

  Meyer Luskin(1)....... 71  Director

  Madan G. Syal(1)...... 71  Director
</TABLE>
- ----------------
(1) Member of Audit Committee and Compensation Committee
 
  Deepak Chopra is the founder of the Company and has served as President,
Chief Executive Officer and Director since the Company's inception in May
1987. He has served as the Company's Chairman of the Board since February
1992. Mr. Chopra also serves as the President and Chief Executive Officer of
the Company's major subsidiaries, including UDT Sensors, Rapiscan U.S.A.,
Rapiscan UK, OSI Singapore and Ferson Optics, Inc. From 1976 to 1979 and from
1980 to 1987, Mr. Chopra held various positions with ILC Technology, Inc.
("ILC"), a publicly-held manufacturer of lighting products, including serving
as Chairman of the Board, Chief Executive Officer, President and Chief
Operating Officer of its United Detector Technology Division. In 1990, the
Company acquired certain assets of ILC's United Detector Technology Division.
Mr. Chopra has held various positions with Intel Corporation, TRW
Semiconductors and RCA Semiconductors. Mr. Chopra holds a B.S. in Electronics
and a M.S. in Semiconductor Electronics. Messrs. Ajay Mehra and Madan G. Syal
are the first cousin and father-in-law, respectively, of Mr. Chopra.
 
  Ajay Mehra joined the Company as Controller in 1989, has served as Vice
President and Chief Financial Officer since November 1992, and became
Secretary and a Director in March 1996. Mr. Mehra also serves as Vice
President and Chief Financial Officer of the Company's major subsidiaries
including UDT Sensors, Rapiscan U.S.A., Rapiscan UK, OSI Singapore, and Ferson
Optics, Inc. Prior to joining the Company, Mr. Mehra held various financial
positions with Thermador/Waste King, a household appliance company, Presto
Food Products, Inc. and United Detector Technology. Mr. Mehra holds a B.A.
from the School of Business of the University of Massachusetts, Amherst, and a
M.B.A from Pepperdine University. Mr. Deepak Chopra is the first cousin of Mr.
Mehra.
 
  Andreas F. Kotowski has served as the President of U.S. Operations, General
Manager and a director of the Company's subsidiary, Rapiscan U.S.A., since
January 1993. As General Manager of Rapiscan U.S.A., Mr. Kotowski is also
responsible for the operations of Rapiscan UK, the subsidiary of Rapiscan
U.S.A. From September 1989 to January 1993, Mr. Kotowski was self-employed as
an Engineering Consultant providing technical and management consulting
services to businesses in the explosive detection and medical imaging
industries. In 1992, Mr. Kotowski was a director of Dextra Medical, Inc., a
company that filed for bankruptcy in July of that year. From 1979 to 1989, Mr.
Kotowski held various positions with EG&G Astrophysics, including Vice
President of Engineering and Chief Engineer in which he was responsible for
product planning, design, development and management. Prior to 1979, he worked
as an Engineer at National
 
                                      41
<PAGE>
 
Semiconductor Corporation and the Jet Propulsion Laboratory. Mr. Kotowski
holds a B.S. in Electrical Engineering and a B.S. in Physics from California
State Polytechnic University, Pomona, and a M.S. in Electrical Engineering
from Stanford University.
 
  Manoocher Mansouri Aliabadi has served as Vice President of Corporate
Marketing for the Company's UDT Sensors subsidiary since March 1994. From
March 1992 to November 1993, Mr. Mansouri served as Director of Sales and
Marketing for UDT Sensors, and from 1990 to 1992, as a Division Director of
the Aerospace and Defense Division of UDT Sensors. Mr. Mansouri joined United
Detector Technology, the predecessor of UDT Sensors in 1982 as an Engineer and
holds a B.S. in Electrical Engineering from the University of California, Los
Angeles.
 
  Anthony S. Crane has served as Managing Director of the Company's
subsidiary, Rapiscan UK, since March 1996. From March 1995 to March 1996, he
served as Sales and Marketing Director for Rapiscan UK, and from February 1993
to March 1995, he served as Sales Director, Middle East, for Rapiscan UK. From
November 1980 to January 1993, Mr. Crane held various positions at Rapiscan UK
before it was acquired by the Company including Exports Business Manager,
Sales Manager and Service Engineer. From May 1974 to November 1980, Mr. Crane
served as Production Coordinator and Electrical and Electronic Inspector for
Redifon Flight Simulation where he was responsible for production and customer
relations.
 
  Thomas K. Hickman has served as Managing Director of the Company's
subsidiaries, OSI Singapore and OSI Malaysia, since July 1995 and as the
Managing Director of Rapiscan Consortium (M) Sdn. Bhd. since its formation in
October 1996. From July 1993 to July 1995, Mr. Hickman served as Vice
President of Operations and Director of Operations for Rapiscan U.S.A. and
Rapiscan UK, respectively. From November 1992 to July 1993, Mr. Hickman served
as Director of Materials for UDT Sensors and, from July through November 1992,
provided service as an independent consultant to UDT Sensors. From 1985
through 1992, Mr. Hickman held various positions at Mouse Systems Corporation,
a manufacturer of computer optical mouse systems, including that of Director
of OEM Operations, Purchasing Manager and Representative Director of a joint
venture. Prior to 1985, Mr. Hickman was the Director of Materials for Measurex
Corporation, the Representative Director for Hitachi-Singer Corp. and a
Product Line Manager for Singer Business Machines. Mr. Hickman holds a B.A.
from Stetson University and a M.B.A. from the University of San Francisco.
 
  Steven C. Good has served as Director of the Company since September 1987.
He is a Senior Partner in the accounting firm of Good Swartz & Berns, which he
founded in 1974, and has been active in consulting and advisory services for
businesses in various sectors including the manufacturing, garment, medical
services and real estate development industries. Mr. Good is the founder and
has served as Chairman of California United Bancorp, and was elected in 1997
as a Director of Arden Realty Group, Inc., a publicly-held Real Estate
Investment Trust listed on the New York Stock Exchange. Mr. Good holds a B.S.
in Business Administration from the University of California, Los Angeles.
 
  Meyer Luskin has served as Director of the Company since February 1990.
Since 1961 Mr. Luskin has served as the President, Chief Executive Officer and
Chairman of the Board of Scope Industries, a publicly-held company listed on
the American Stock Exchange and engaged in the business of recycling and
processing food waste products into animal food. Mr. Luskin has also served as
Director of Scope Industries since 1958 and currently serves as Director of
Stamet, Inc., an industrial solid pump manufacturer. Mr. Luskin holds a B.A.
from the University of California, Los Angeles, and a M.B.A. from Stanford
University.
 
  Madan G. Syal has served as Director of the Company since the Company's
inception in May 1987. From May 1987 until February 1992, he served as
Secretary of the Company. Mr. Syal is the sole proprietor of Pro Printers, a
printing service business he founded in October 1984. Prior to 1984, Mr. Syal
held various positions with Shell Oil Company, Exxon Corporation, Burmah Oil
Company, C.F. Braun and Bechtel Group, Incorporated. Mr. Syal holds a B.S.
from the American College in Lahore (now Pakistan) and a B.S.E. in Electrical
and Mechanical Engineering from London University. Mr. Deepak Chopra is the
son-in-law of Mr. Syal.
 
                                      42
<PAGE>
 
  There are currently five members of the Board of Directors. After the
completion of the Offering, the management of the Company intends to increase
the number of independent directors of the Company by increasing the number of
directors constituting the Board of Directors. No nominees for the additional
Board seats have yet been identified. The Directors serve until the next
annual meeting of shareholders or until successors are elected and qualified.
The Company's executive officers are appointed by, and serve at the discretion
of, the Board of Directors of the Company.
 
  The Board of Directors has established an Audit Committee and a Compensation
Committee. The functions of the Audit Committee include recommending to the
Board the selection and retention of independent auditors, reviewing the scope
of the annual audit undertaken by the Company's independent auditors and the
progress and results of their work, and reviewing the financial statements of
the Company and its internal accounting and auditing procedures. The functions
of the Compensation Committee include establishing the compensation of the
Chief Executive Officer, reviewing and approving executive compensation
policies and practices, reviewing salaries and bonuses for certain executive
officers of the Company, administering the Company's employee stock option
plans, and considering such other matters as may, from time to time, be
delegated to the Compensation Committee by the Board of Directors.
 
  Each non-employee Director currently receives a cash fee of $1,250 per Board
meeting attended and an additional $1,250 per Board committee meeting attended
if such committee meeting is held on a day different from that of the Board
meeting. During the fiscal year ended June 30, 1997, each non-employee
Director received, as additional director compensation, options to purchase
5,000 shares of Common Stock at an exercise price of $13.50 per share. The
Directors are reimbursed for expenses incurred in connection with the
performance of their services as Directors.
 
COMPENSATION COMMITTEE INTERLOCKS AND INSIDER PARTICIPATION
 
  During the fiscal year ended June 30, 1997, all of the outside Directors,
Steven C. Good, Meyer Luskin and Madan G. Syal, served on the Board's
compensation committee. Certain transactions between the Company and the
members of the compensation committee include the following: Mr. Good is a
senior partner of Good Swartz & Berns, an accounting firm that provided
services to the Company. The Good Swartz & Berns Pension & Profit Sharing
Plan, in which Mr. Good participates, exercised certain warrants to purchase
stock of the Company by applying the outstanding principal amount under
certain promissory notes issued to the pension plan by the Company. Mr. Luskin
is the President, Chief Executive Officer and Chairman of Scope Industries
which provided consultation services to the Company for a fee in the amount of
$100,000. Scope Industries also exercised certain warrants to purchase stock
of the Company by applying the outstanding principal amount under a promissory
note issued by the Company to Scope Industries. Mr. Syal owns Pro Printers, a
printing service company that provides printing services to the Company. For
additional information regarding these direct or indirect transactions between
the outside Directors, see "Certain Transactions." Mr. Syal is the father-in-
law of Deepak Chopra, the President, Chief Executive Officer and Chairman of
the Company.
 
  The Company believes that each of the foregoing transactions was on terms at
least as favorable to the Company as those that could have been obtained from
nonaffiliated third parties. The Company currently intends that any future
transactions with affiliates of the Company will be on terms at least as
favorable to the Company as those that can be obtained from nonaffiliated
third parties.
 
                                      43
<PAGE>
 
EXECUTIVE COMPENSATION
 
  The following table sets forth certain compensation earned during the fiscal
year ended June 30, 1997, by the Company's Chief Executive Officer and the
four other most highly compensated executive officers whose total salary and
bonus during such year exceeded $100,000 (collectively, the "Named Executive
Officers"):
 
                          SUMMARY COMPENSATION TABLE
 
<TABLE>
<CAPTION>
                                                                     LONG TERM
                                                                    COMPENSATION
                                                                    ------------
                                                       ANNUAL        SECURITIES
                                                    COMPENSATION     UNDERLYING
                                                  -----------------   OPTIONS
NAME AND PRINCIPAL POSITION                        SALARY   BONUS      (#)(2)
- ---------------------------                       -------- -------- ------------
<S>                                               <C>      <C>      <C>
Deepak Chopra(1)................................. $370,843 $175,000   137,500
 Chief Executive Officer
Ajay Mehra ......................................  172,216   58,040    73,750
 Chief Financial Officer
Andreas F. Kotowski .............................  124,452   10,000    57,029
 President of U.S. Operation, Rapiscan U.S.A.
Manoocher Mansouri Aliabadi......................  110,019   28,000    15,000
 Vice President--Corporate Marketing, UDT Sensors
Thomas K. Hickman ...............................  124,220   12,500    10,125
 Managing Director, OSI Malaysia and OSI
  Singapore
</TABLE>
- ----------------
(1) The Company paid aggregate insurance premiums of approximately $23,000 for
    two universal life insurance policies of Mr. Chopra. Mr. Chopra or his
    estate is obligated to repay to the Company all amounts paid by it on
    behalf of Mr. Chopra upon the death or termination of employment of Mr.
    Chopra. The value of such benefit is not susceptible to precise
    determination.
(2) For additional information see "Option Grants."
 
  The Company has entered into an employment agreement with Deepak Chopra,
with a term of five years commencing on April 1, 1997, pursuant to which he
serves as President, Chief Executive Officer and Chairman of the Board of the
Company. The employment agreement provides for a base salary of $450,000 per
year, with annual raises to be determined by the Compensation Committee.
Pursuant to the employment agreement, Mr. Chopra is also entitled to receive
at least one-third of the amount of the aggregate bonus pool established by
the Company for its officers and employees. Mr. Chopra is eligible to
participate in certain incentive compensation and other employee benefit plans
established by the Company from time to time.
 
  The Company has also entered into a three-year employment agreement with
Ajay Mehra and a two-year employment agreement with Manoocher Mansouri
Aliabadi, each of which became effective on April 1, 1997. The employment
agreements provide for base salaries of $200,000 and $120,000 per year, for
Messrs. Mehra and Mansouri, respectively, with annual raises to be determined
by the Company's Chief Executive Officer. Pursuant to these employment
agreements, Messrs. Mehra and Mansouri are also eligible for certain bonus
payments and to participate in incentive compensation and other employee
benefit plans established by the Company from time to time. Each of the
employment agreements contains confidentiality provisions and provides that
the employee shall assign and the Company shall be entitled to any inventions
or other proprietary rights developed by the employee under certain
circumstances during his employment.
 
  Andreas F. Kotowski is currently employed by the Company pursuant to an
employment agreement that is terminable by either party thereto at any time
for any reason. Mr. Kotowski's current annual salary is $140,000.
 
                                      44
<PAGE>
 
  Thomas K. Hickman is currently employed by the Company pursuant to an
employment agreement that may be terminated by either the Company or by Mr.
Hickman upon six months prior notice. Under the employment agreement, Mr.
Hickman's annual salary is $125,000. In addition to the salary, the Company
has agreed to pay certain relocation expenses related to Mr. Hickman's service
in Singapore.
 
  Anthony S. Crane is currently employed by the Company pursuant to an
employment agreement with a term that ends in December 1998.
 
  Pursuant to an incentive compensation agreement entered into in December
1996 by the Company and Andreas F. Kotowski, Mr. Kotowski is entitled to
receive as additional incentive compensation, 10.0% of the consolidated pre-
tax earnings of Rapiscan U.S.A. and Rapiscan UK in excess of certain pre-
determined amounts. Such incentive compensation may not exceed $150,000 for
any fiscal year and is based on earnings of Rapiscan U.S.A. and Rapiscan UK
for the 1997, 1998 and 1999 fiscal years. Mr. Kotowski was not entitled to
receive such additional incentive compensation for the 1997 fiscal year.
 
  The management of the Company allocates bonuses to officers and employees of
the Company under a bonus plan that has been in effect since the Company's
inception. The amount of bonus for each officer or employee is determined by
comparing the profits of the subsidiary or division in which such person
performed services against the budget profit goals for such subsidiary or
division as determined before the start of the fiscal year. Bonuses were
distributed to over 100 officers and employees in May and June 1997 based on
their performances during the fiscal year ended June 30, 1997.
 
OPTION GRANTS
 
  The following table sets forth certain information concerning grants of
options to the Named Executive Officers during the year ended June 30, 1997:
 
                       OPTION GRANTS IN LAST FISCAL YEAR
 
<TABLE>
<CAPTION>
                                                                                     POTENTIAL REALIZABLE
                                                                                       VALUE AT ASSUMED
                          NUMBER OF    % OF TOTAL                                   ANNUAL RATES OF STOCK
                         SECURITIES     OPTIONS                                     PRICE APPRECIATION FOR
                         UNDERLYING    GRANTED TO   EXERCISE   MARKET                   OPTION TERM(1)
                           OPTIONS     EMPLOYEES      PRICE     PRICE   EXPIRATION ------------------------
          NAME           GRANTED (#) IN FISCAL YEAR ($/SHARE) ($/SHARE)    DATE     0% ($)  5% ($)  10% ($)
          ----           ----------- -------------- --------- --------- ---------- -------- ------- -------
<S>                      <C>         <C>            <C>       <C>       <C>        <C>      <C>     <C>
Deepak Chopra...........    37,500         5.7%       $3.33     $6.67    12/14/01  $125,000 $34,535 $76,314
                           100,000        15.3        13.50       N/A     5/31/02       N/A 372,980 824,189
Ajay Mehra(2)...........    30,000         4.6         3.33      6.67    12/14/01   100,000  27,601  60,990
                            10,000         1.5        13.50       N/A     5/31/02       N/A  37,298  82,419
                            30,000         4.6        11.50       N/A     5/31/02       N/A  95,317 210,626
Andreas F. Kotowski(2)..     7,500         1.1         2.83      6.67    12/14/01    28,750   5,871  12,973
                            20,000         3.1        11.50       N/A     5/31/02       N/A  63,545 140,417
Manoocher Mansouri
 Aliabadi(2)............     7,500         1.1         2.83      6.67    12/14/01    28,750   5,871  12,973
                             7,500         1.1        11.50       N/A     5/31/02       N/A  23,829  52,656
Thomas K. Hickman(2)....     3,750         0.6         2.83      6.67    12/14/01    14,375   2,935   6,487
                             6,000         0.9        11.50       N/A     5/31/02       N/A  19,063  42,125
</TABLE>
 
- ----------------
(1) Sets forth potential option gains based on assumed annualized rates of
    stock price appreciation from the exercise price at the date of grant of
    5.0% and 10.0% (compounded annually) over the full term of the grant with
    appreciation determined as of the expiration date. The 0.0%, 5.0% and
    10.0% assumed rates of appreciation are mandated by the rules of the
    Securities and Exchange Commission, and do not represent the Company's
    estimate or projection of future Common Stock prices.
(2) Excludes options granted as consideration for the acquisition by the
    Company of the minority interests in Rapiscan U.S.A. See "Certain
    Transactions."
 
                                      45
<PAGE>
 
OPTION EXERCISES AND FISCAL YEAR-END VALUES
 
  The following table sets forth certain information regarding option
exercises by the Named Executive Officers during the fiscal year 1997 and held
by them on June 30, 1997:
 
                AGGREGATED OPTION EXERCISES IN LAST FISCAL YEAR
                       AND FISCAL YEAR-END OPTION VALUES
 
<TABLE>
<CAPTION>
                                                     NUMBER OF SECURITIES
                                                    UNDERLYING UNEXERCISED   VALUE OF UNEXERCISED IN-
                                                    OPTIONS AT FISCAL YEAR-    THE-MONEY OPTIONS AT
                            SHARES                          END (#)           FISCAL YEAR END ($)(1) -
                         ACQUIRED ON     VALUE     ------------------------- -------------------------
          NAME           EXERCISE (#) REALIZED ($) EXERCISABLE UNEXERCISABLE EXERCISABLE UNEXERCISABLE
          ----           ------------ ------------ ----------- ------------- ----------- -------------
<S>                      <C>          <C>          <C>         <C>           <C>         <C>
Deepak Chopra...........        0            --      37,500       100,000     $381,375     $      0
Ajay Mehra..............    9,000       $107,100     75,000        40,000      814,500       60,000
Andreas F. Kotowski.....        0            --       7,500        20,000       80,025       40,000
Manoocher Mansouri
 Aliabadi...............    7,500         89,250     13,500         8,250      149,500       23,625
Thomas K. Hickman.......    9,750        109,925     15,187        14,813      174,648      109,600
</TABLE>
- ---------------
(1) Amounts are shown as the positive spread between the exercise price and
    fair market value (based on an estimated initial offering price of $13.50
    per share).
 
STOCK OPTION PLANS
 
  1987 Incentive Stock Option Plan. In May 1987, the Board of Directors
adopted the Incentive Stock Option Plan (the "1987 Plan"). The 1987 Plan
provides for the grant of options to directors, officers and other key
employees of the Company to purchase up to an aggregate of 1,050,000 shares of
Common Stock. The purpose of the 1987 Plan is to provide participants with
incentives which will encourage them to acquire a proprietary interest in, and
continue to provide services to, the Company. The 1987 Plan is administered by
the Board of Directors which has discretion to select optionees and to
establish the terms and conditions of each option, subject to the provisions
of the 1987 Plan. Pursuant to the 1987 Plan, the Company has from time to time
granted its directors, officers and employees options to purchase shares of
the Company's Common Stock at exercise prices determined by the Board of
Directors. The stock options generally expire either on the fifth or tenth
anniversary of the date of grant of the option. All stock options are non-
transferrable by the grantee and may be exercised only by the optionee during
his service to the Company as a director, officer or employee. The aggregate
number of options issuable under the 1987 Plan, number of options outstanding
and the exercise price thereof are subject to adjustment in the case of
certain transactions such as mergers, recapitalizations, stock splits or stock
dividends. As of August 15, 1997, 384,375 shares had been issued upon the
exercise of stock options under the 1987 Plan, stock options to purchase an
aggregate of 426,000 shares were outstanding under the 1987 Plan at exercise
prices ranging from $0.17 to $3.33 per share, and 239,625 shares remained
available for grant. As of such date, stock options to purchase 385,313 shares
of Common Stock were exercisable. No stock options may be granted under the
1987 Plan after December 31, 1998.
 
  1997 Stock Option Plan. In May 1997, the Board of Directors adopted the
Company's 1997 Stock Option Plan (the "1997 Plan"). The 1997 Plan, which was
approved by the Company's shareholders in June 1997, provides for the grant of
options to directors, officers, other employees and consultants of the Company
to purchase up to an aggregate of 850,000 shares of Common Stock. No eligible
person may be granted options during any 12-month period covering more than
425,000 shares of Common Stock. The purpose of the 1997 Plan is to provide
participants with incentives which will encourage them to acquire a
proprietary interest in, and continue to provide services to, the Company. The
1997 Plan is to be administered by the Board of Directors, or a committee of
the Board, which has discretion to select optionees and to establish the terms
and conditions of each option, subject to the provisions of the 1997 Plan.
Options granted under the 1997 Plan may be "incentive stock options" as
defined in Section 422 of the Internal Revenue Code of 1986, as amended (the
"Code"), or nonqualified options.
 
                                      46
<PAGE>
 
  The exercise price of incentive stock options may not be less than 100% of
the fair market value of Common Stock as of the date of grant (110% of the
fair market value if the grant is to an employee who owns more than 10.0% of
the total combined voting power of all classes of capital stock of the
Company). The Code currently limits to $100,000 the aggregate value of Common
Stock that may be acquired in any one year pursuant to incentive stock options
under the 1997 Plan or any other option plan adopted by the Company.
Nonqualified options may be granted under the 1997 Plan at an exercise price
of not less than 85.0% of the fair market value of the Common Stock on the
date of grant. Nonqualified options may be granted without regard to any
restriction on the amount of Common Stock that may be acquired pursuant to
such options in any one year. Options may not be exercised more than ten years
after the date of grant (five years after the date of grant if the grant is an
incentive stock option to an employee who owns more than 10.0% of the total
combined voting power of all classes of capital stock of the Company). Options
granted under the 1997 Plan generally are nontransferable, but transfers may
be permitted under certain circumstances in the discretion of the
administrator. Shares subject to options that expire unexercised under the
1997 Plan will once again become available for future grant under the 1997
Plan. The number of options outstanding and the exercise price thereof are
subject to adjustment in the case of certain transactions such as mergers,
recapitalizations, stock splits or stock dividends. The 1997 Plan is effective
for ten years, unless sooner terminated or suspended.
 
  In May 1997, the Board of Directors of the Company authorized grants of
options to purchase 434,486 shares of Common Stock available for issuance
under the 1997 Plan to certain directors, officers and employees of the
Company. Of these options, 125,000 are exercisable at a price of $13.50 per
share and 309,486 are exercisable at $11.50 per share. The options generally
will be subject to vesting and will become exercisable over a period of four
years from the date of grant, subject to the optionee's continuing employment
with the Company.
 
  In general, upon termination of employment of an optionee, all options
granted to such person which were not exercisable on the date of such
termination will immediately terminate, and any options that are exercisable
will terminate not more than three months (six months in the case of
termination by reason of death or disability) following termination of
employment.
 
  To the extent nonqualified options are granted under the 1987 Plan and the
1997 Plan after the Offering, the Company intends to issue such options with
an exercise price of not less than the market price of the Common Stock on the
date of grant.
 
EMPLOYEE BENEFIT PLAN, PENSION PLANS
 
  In 1991, the Company established a tax-qualified employee savings and
retirement plan (the "401(k) Plan") covering all of its employees. Pursuant to
the 401(k) Plan, employees may elect to reduce their current compensation by
up to the annual limit prescribed by statute ($9,500 in 1997) and contribute
the amount of such reduction to the 401(k) Plan. The 401(k) Plan allows for
matching contributions to the 401(k) Plan by the Company, such matching and
the amount of such matching to be determined at the sole discretion of the
Board of Directors. To date, no such matching contributions have been made
with respect to the 401(k) Plan. The trustee under the 401(k) Plan, at the
direction of each participant, invests the assets of the 401(k) Plan in
numerous investment options. The 401(k) Plan is intended to qualify under
Section 401 of the Code so that contributions by employees to the 401(k) Plan,
and income earned on plan contributions, are not taxable until withdrawn, and
so that the contributions by employees will be deductible by the Company when
made.
 
  Rapiscan UK and AME each have a pension plan in effect for certain of their
employees. As of the date hereof, approximately 50 employees are covered by
these plans.
 
LIMITATION ON DIRECTORS' LIABILITY
 
  The Company's Articles of Incorporation ("Articles") provide that, pursuant
to the California Corporations Code, the liability of the directors of the
Company for monetary damages shall be eliminated to the fullest extent
permissible under California law. This is intended to eliminate the personal
liability of a director for monetary damages in an action brought by, or in
the right of, the Company for breach of a
 
                                      47
<PAGE>
 
director's duties to the Company or its shareholders. This provision in the
Articles does not eliminate the directors' fiduciary duty and does not apply
for certain liabilities: (i) for acts or omissions that involve intentional
misconduct or a knowing and culpable violation of law; (ii) for acts or
omissions that a director believes to be contrary to the best interest of the
Company or its shareholders or that involve the absence of good faith on the
part of the director; (iii) for any transaction from which a director derived
an improper personal benefit; (iv) for acts or omissions that show a reckless
disregard for the director's duty to the Company or its shareholders in
circumstances in which the director was aware, or should have been aware, in
the ordinary course of performing a director's duties, of a risk of serious
injury to the Company or its shareholders; (v) for acts or omissions that
constitute an unexcused pattern of inattention that amounts to an abdication
of the director's duty to the Company or its shareholders; (vi) with respect
to certain transactions or the approval of transactions in which a director
has a material financial interest; and (vii) expressly imposed by statute for
approval of certain improper distributions to shareholders or certain loans or
guarantees. This provision also does not limit or eliminate the rights of the
Company or any shareholder to seek non-monetary relief such as an injunction
or rescission in the event of a breach of a director's duty of care. The
Company's Amended and Restated Bylaws require the Company to indemnify its
officers and directors under certain circumstances Among other things, the
Bylaws require the Company to indemnify directors and officers against certain
liabilities that may arise by reason of their status or service as directors
and officers and allows the Company to advance their expenses incurred as a
result of any proceeding against them as to which they could be indemnified.
 
  The Company believes that it is the position of the Commission that insofar
as the foregoing provision may be invoked to disclaim liability for damages
arising under the Securities Act, the provision is against public policy as
expressed in the Securities Act and is therefore unenforceable. Such
limitation of liability also does not affect the availability of equitable
remedies such as injunctive relief or rescission.
 
  The Company intends to enter into indemnity agreements ("Indemnity
Agreement(s)") with each of its directors and executive officers prior to the
consummation of the Offering. Each such Indemnity Agreement will provide that
the Company shall indemnify the indemnitee against expenses, including
reasonable attorneys' fees, judgements, penalties, fines and amounts paid in
settlement actually and reasonably incurred by him in connection with any
civil or criminal action or administrative proceeding arising out of the
performance of his duties as a director or officer. Such indemnification is
available if the indemnitee acted in good faith and in a manner he reasonably
believed to be in or not opposed to the best interests of the Company, and,
with respect to any criminal action, had no reasonable cause to believe his
conduct was unlawful. The Indemnity Agreements will also require that the
Company indemnify the director or executive officer in all cases to the
fullest extent permitted by applicable law. Each Indemnity Agreement will
permit the director or officer that is party thereto to bring suit to seek
recovery of amounts due under the Indemnity Agreement and to recover the
expenses of such a suit if he is successful. Insofar as indemnification for
liabilities arising under the Securities Act may be permitted to directors,
officers or persons controlling the Company pursuant to the foregoing
provisions, the Company has been informed that in the opinion of the
Commission, such indemnification is against public policy as expressed in the
Securities Act and is therefore unenforceable. The Company believes that its
Articles and Bylaw provisions are necessary to attract and retain qualified
persons as directors and officers.
 
                                      48
<PAGE>
 
                             CERTAIN TRANSACTIONS
 
  In 1993, the Company formed Rapiscan U.S.A. for the purpose of acquiring
most of the capital stock of Rapiscan UK. As of October 1996, the Company
owned 85.5% of the outstanding capital stock of Rapiscan U.S.A., and 14.5%
(the "Option Shares") was owned by executive officers or employees of the
Company, including Ajay Mehra, Andreas F. Kotowski, Anthony S. Crane and
Thomas K. Hickman. See "Management--Executive Officers and Directors." In
connection with the formation of Rapiscan U.S.A., the Company was granted an
option to purchase all of the Option Shares. In November 1996, the Company
exercised its option to acquire the Option Shares. The aggregate consideration
paid for the Option Shares consisted of the following: (i) the issuance of a
total of 159,201 shares of Common Stock valued at $6.67 per share; (ii) the
issuance of options to purchase a total of 45,486 shares of Common Stock at a
purchase price of $11.50 per share; and (iii) the issuance to the holders of
the Option Shares of 27,654 additional shares of Common Stock which was based
on the net income before taxes of Rapiscan U.S.A. and Rapiscan UK combined for
the fiscal year ended June 30, 1997. The consideration paid by each of Messrs.
Kotowski, Crane, Hickman and Mehra for their minority interests in Rapiscan
U.S.A. was $119,372, $6,610, $500 and $125, respectively.
 
  Until September 1996, the Company owned approximately 95.9% of the
outstanding capital stock of Ferson Optics, Inc., and certain employees and
officers of the Company, including Ajay Mehra and Thomas K. Hickman, the
Managing Director of OSI Malaysia, owned the remaining shares. Mr. Mehra and
Mr. Hickman acquired their minority interests in Ferson for $250 and $3,000,
respectively. In September 1996, the Company purchased all of the remaining
shares of Ferson from the minority shareholders in exchange for a total of
19,755 shares of Common Stock. The Common Stock was valued at $6.67 per share.
Ajay Mehra and Thomas K. Hickman received 12,500 and 750 shares of Common
Stock, respectively, in connection with the foregoing exchange.
 
  In June 1989, April 1990 and February 1993 the Company, as part of its plan
of financing, issued subordinated promissory notes in the aggregate principal
amounts of approximately $385,000, $3,520,000 and $575,000, respectively, with
related warrants or conversion rights to purchase capital stock of the
Company. The purchasers of the subordinated notes included certain of the
Company's directors, executive officers, principal shareholders and members of
their families (collectively, the "Related Parties"). The June 1989 promissory
notes bore interest at a fixed rate of 11.00% per annum while the April 1990
and February 1993 promissory notes bore interest at a variable rate based on
certain banks' prime rate plus 1.50% per annum. The promissory notes, warrants
and conversion rights provided that the note holders were entitled to exercise
the warrants or convert the notes into capital stock of the Company by
cancelling the appropriate amounts of the outstanding principal amount and
accrued interest of such promissory notes. The exercise price of the warrants
issued in June 1989 and April 1990 was $1.33 per share, whereas the exercise
price of the warrants and convertible notes issued in February 1993 was $1.87
per share.
 
  During fiscal 1995, 1996 and 1997, all amounts outstanding under the
promissory notes were either paid in full by the Company to the note holders
or applied towards the exercise of the related warrants or conversion rights
at the election of the note holders. The Company paid in cash the outstanding
principal amount of $530,000 and all interest due thereon to one principal
shareholder, Sally F. Chamberlain, in satisfaction of the promissory notes
held by her personally and as trustee of the Edward P. Fleischer and Sally F.
Fleischer Family Trust. The other Related Parties elected to exercise their
warrants and conversion rights by purchasing the Company's capital stock with
the outstanding principal amounts of their promissory notes. As a result,
certain Related Parties who were collectively owed $2,710,000 under the
promissory notes, were issued an aggregate of 2,030,358 shares of Common Stock
in lieu of the repayment of the principal amount of their promissory notes.
Other Related Parties included Scope Industries, Ajay Mehra, members of Mr.
Mehra's family, members of Mr. Chopra's family, and the Good Swartz & Berns
Pension Fund. Scope Industries is a principal shareholder of the Company, and
Meyer Luskin is a director of the Company and is the President, director and a
major shareholder of Scope Industries. Steve C. Good is a director of the
Company and a participant in the Good Swartz & Berns Pension Fund.
 
 
                                      49
<PAGE>
 
  The Company, Mr. Chopra and Mr. Mehra, each currently owns a 36.0%, 10.5%
and 4.5% interest, respectively, in ECIL Rapiscan. Mr. Chopra is the Chairman,
President and Chief Executive Officer of the Company. The remaining 49.0%
interest in ECIL Rapiscan is owned by ECIL, an unaffiliated Indian company.
The Company sells the security and inspection kits to ECIL at a price no less
favorable to the Company than the price the Company charges unaffiliated third
parties for such products. To date the Company's portion of the earnings of
ECIL Rapiscan have been insignificant.
 
  Pursuant to a Consulting Agreement entered into in July 1996, the Company
hired Scope Industries to provide planning and financial consulting services
to the Company including advice regarding the valuation of the Company and
certain of its subsidiaries. Upon the completion of the consulting services in
December 1996, the Company paid Scope Industries a fee in the amount of
$100,000 as full payment for such services.
 
  From time to time the Company contracts for automobile rental and messenger
services from a business that is owned by Deepak Chopra and his wife. The
Company paid the business approximately $83,000 and $111,000 for such services
during fiscal 1996 and 1997, respectively. The Company also contracts for
printing services from a business owned by Madan G. Syal, a director of the
Company. The Company paid the business approximately $63,000 and $82,000 for
such services during fiscal 1996 and 1997, respectively.
 
  The Company believes that each of the foregoing transactions was on terms at
least as favorable to the Company as those that could have been obtained from
nonaffiliated third parties. The Company currently intends that any future
transactions with affiliates of the Company will be on terms at least as
favorable to the Company as those that can be obtained from nonaffiliated
third parties.
 
                                      50
<PAGE>
 
                      PRINCIPAL AND SELLING SHAREHOLDERS
 
  The following table sets forth the beneficial ownership of Common Stock as
of August 15, 1997, and as adjusted to reflect the sale of Common Stock
offered hereby (assuming no exercise of the Underwriters' over-allotment
option), by: (i) each person known by the Company to beneficially own 5.0% or
more of the outstanding shares of Common Stock; (ii) each director of the
Company; (iii) each Named Executive Officer of the Company; (iv) the Selling
Shareholders; and (v) all directors and executive officers of the Company as a
group. Footnotes (2) and (3) to the table also set forth certain information
with respect to the beneficial ownership of the Selling Shareholders, assuming
the Underwriters exercise their over-allotment option in full. The information
set forth in the table and accompanying footnotes has been furnished by the
named beneficial owners.
<TABLE>
<CAPTION>
                                       SHARES                       SHARES
                                    BENEFICIALLY                 BENEFICIALLY
                                   OWNED PRIOR TO   NUMBER OF     OWNED AFTER
                                     OFFERING(1)      SHARES    OFFERING(1)(3)
                                  -----------------   BEING    -----------------
   NAME AND BENEFICIAL OWNERS      NUMBER   PERCENT OFFERED(2)  NUMBER   PERCENT
   --------------------------     --------- ------- ---------- --------- -------
<S>                               <C>       <C>     <C>        <C>       <C>
Scope Industries(4)(5)..........  1,875,000  30.5%   148,148   1,726,852  18.2%
Sally F. Chamberlain(6)(7)......  1,170,375  19.0     63,343   1,107,032  11.7
Deepak Chopra(6)(8).............  1,539,484  24.9          0   1,539,484  16.2
Ajay Mehra(9)...................    195,693   3.1          0     195,693   2.0
Andreas F. Kotowski(10).........    128,806   2.1          0     128,806   1.4
Manoocher Mansouri Aliabadi(11).     73,607   1.2          0      73,607    *
Thomas K. Hickman(12)...........     27,228    *           0      27,228    *
Steven C. Good(13)..............     40,313    *      21,896      18,417    *
Madan G. Syal(14)...............    243,938   4.0     25,926     218,012   2.3
Meyer Luskin(15)................     23,438    *           0      23,438    *
Good Swartz & Berns Pension &
 Profit Sharing Plan(16)........    148,125   2.4      3,000     145,125   1.5
Leila and Birinder Mehra........     25,500    *       3,704      21,796    *
Zev and Elaine Edelstein Trust..     77,679   1.3      9,259      68,420    *
Mohinder Chopra.................     75,000   1.2      9,259      65,741    *
Glenn P. Sorenson...............     75,000   1.2      9,259      65,741    *
Charles and Kiran M. Kerpelman..     65,357   1.1      9,259      56,098    *
Martha B. Holmes................     60,000    *       9,259      50,741    *
Combined TR/DR Account Trust....     52,500    *       7,407      45,093    *
Gary E. Fleischer...............     14,625    *      14,625           0    --
Cathleen A. Redinger............     14,625    *      14,625           0    --
Mark and Penny Berns Trust......      9,732    *       5,982       3,750    *
Arnold G. and Hope Anisgarten...      9,287    *       5,709       3,578    *
Rajiv Mehra.....................      2,057    *         450       1,607    *
Surendra V. and Kala Jain(17)...     13,393    *       5,186       8,207    *
Renu Jivrajka...................     11,250    *       1,852       9,398    *
Amita Jivrajka..................      7,500    *       1,852       5,648    *
All executive officers and
 directors as a group
 (9 persons)....................  2,286,136  36.4     47,822   2,238,314  23.3
</TABLE>
- ----------------
 *  Less than 1.0%.
(1) Beneficial ownership is determined in accordance with the rules of the
    Securities and Exchange Commission and generally includes voting or
    investment power with respect to securities. Shares of Common Stock
    subject to options currently exercisable, or exercisable within 60 days of
    August 15, 1997, are deemed outstanding for computing the percentage of
    the person holding such options but are not deemed outstanding for
    computing the percentage of any other person. Except as indicated by
    footnote and subject to community property laws where applicable, the
    persons named in the table have sole voting and investment power with
    respect to all shares of Common Stock shown as beneficially owned by them.
 
                                      51
<PAGE>
 
 (2) Excludes shares of Common Stock to be offered by the Selling Shareholders
     if the over-allotment option granted to the Underwriters is exercised.
     The following Selling Shareholders will sell the following number of
     additional shares of Common Stock if the Underwriters' over-allotment
     option is exercised in full: Scope Industries (88,519); Sally F.
     Chamberlain (49,630); Deepak Chopra (185,185); Ajay Mehra (33,333);
     Andreas F. Kotowski (18,519); Manoocher Mansouri Aliabadi (14,815);
     Thomas K. Hickman (3,704); Steven C. Good (15,604); Madan G. Syal
     (18,519); Meyer Luskin (9,259); Good Swartz & Berns Pension & Profit
     Sharing Plan (3,309); Leila and Birender Mehra (3,704); Zev and Elaine
     Edelstein Trust (9,259); Mohinder Chopra (11,111); Glenn P. Sorenson
     (11,111); Charles and Kiran M. Kerpelman (9,259); Combined TR/DR Account
     Trust (7,407); Susan Sutherland (7,407); Anuj Wadhawan (7,407); Bette J.
     Moore (7,407); Robert W. Kephart (5,556); Phillip M. Wascher (7,407);
     Charan J. Dewan (3,704); Jack Kimbro (1,111); Narayan Taneja (1,481);
     Dennis Noble (741); Peter Bui (741); Alan J. and Pamela Barnard (1,481);
     Christine Williams (741); Christopher Chin (926); Anthony S. and Suzie B.
     Crane (1,481); Khai Le (741); Mark and Penny Berns Trust (1,518); Arnold
     G. and Hope Anisgarten (1,791); Surendra and Kala Jain (5,926); Neil
     Jivrajka (740); Renu Jivrajka (1,482); Amita Jivrajka (1,482); Louis S.
     and Linda O. Peters (741); Lincoln A. Gladden (741). Susan Sutherland,
     Anuj Wadhawan, Bette J. Moore, Robert W. Kephart, Phillip M. Wascher,
     Charan J. Dewan, Jack Kimbro, Narayan Taneja, Dennis Noble, Peter Bui,
     Alan J. Barnard, Christine Williams, Christopher Chin, Khai Le, Louis
     Peters and Lincoln A. Gladden are employees of the Company or its
     affiliates. Anthony S. Crane is the Managing Director of Rapiscan UK. See
     "Management."
 (3) Assuming the Underwriters' over-allotment option is exercised in full,
     the number and percent of the shares beneficially owned after the
     Offering by the Selling Shareholders will be as follows: Scope Industries
     (1,638,333, 17.3%); Sally F. Chamberlain 1,057,402, 11.1%); Deepak Chopra
     (1,354,299, 14.2%); Ajay Mehra (162,360, 1.7%); Andreas F. Kotowski
     110,287, 1.2%); Manoocher Mansouri Aliabadi (58,792); Thomas K. Hickman
     (23,524) Steven C. Good (2,843); Madan G. Syal (199,493, 2.1%); Meyer
     Luskin (14,179); Good Swartz & Berns Pension & Profit Sharing Plan
     (141,816, 1.5%); Leila and Birender Mehra (18,092); Zev and Elaine
     Edelstein Trust (59,161); Mohinder Chopra (54,630); Glenn P. Sorenson
     (54,630); Charles and Kiran M. Kerpelman (46,839); Combined TR/DR Account
     Trust (37,686); Susan Sutherland (35,343); Anuj Wadhawan (29,835);
     BetteJ. Moore (28,218); Robert W. Kephart (22,944); Phillip M. Wascher
     (23,241); Charan J. Dewan (16,171); Jack Kimbro (15,389); Narayan Taneja
     (23,698); Dennis Noble (11,446); Peter Bui (7,884); Alan J. and Pamela
     Barnard (9,704); Christine Williams (6,384); Christopher Chin (6,199);
     Anthony S. and Suzie B. Crane (12,148); Khai Le (8,956); Mark and Penny
     Berns Trust (2,232); Arnold G. and Hope Anisgarten (1,787); Surendra and
     Kala Jain (2,281); Neil Jivrajka (10,510); Renu Jivrajka (7,916); Amita
     Jivrajka (4,166); Louis S. and Linda O. Peters (6,510); Lincoln A.
     Gladden (4,134). Except as otherwise indicated in this footnote the
     percentage of Common Stock beneficially owned by the Selling Shareholders
     after this Offering if the over-allotment option is exercised in full is
     less than 1.0% for each person listed in this footnote.
 (4) The address of Scope Industries is 233 Wilshire Boulevard, Suite 310,
     Santa Monica, California 90401.
 (5) Does not include shares beneficially owned by Meyer Luskin. Mr. Luskin is
     the President, Chief Executive Officer, Chairman of the Board and a
     principal shareholder of Scope Industries.
 (6) The address of such shareholder is c\\o OSI Systems, Inc., 12525 Chadron
     Avenue, Hawthorne, California 90250.
 (7) Such shares are held by Sally F. Chamberlain as Trustee of the Edward P.
     Fleischer and Sally F. Fleischer Family Trust dated June 3, 1991.
 (8) Includes 254,951 shares and 254,951 shares owned by The Deepika Chopra
     Trust UDT dated July 17, 1987 and The Chandini Chopra Trust UDT dated
     July 17, 1987, respectively. Deepak Chopra is the co-trustee of both
     irrevocable trusts. Also includes 10,179 shares and 10,179 shares owned
     by Deepika Chopra and Chandini Chopra, respectively, who are the
     daughters of Mr. Chopra. Of the balance of such shares, 960,099 shares
     are held jointly by Mr. Chopra and his wife, Nandini Chopra, and 49,125
     shares are held individually by Mr. Chopra. 37,500 shares of the 49,125
     shares are issuable pursuant to options exercisable within 60 days of
     August 15, 1997. Mr. Chopra is the President, Chief Executive Officer and
     Chairman of the Board of the Company. See "Management."
 (9) Includes 75,000 shares issuable pursuant to options exercisable within 60
     days of August 15, 1997. Mr. Mehra is the Vice President, Chief Financial
     Officer, Secretary and Director of the Company. See "Management."
(10) Includes 7,500 shares issuable pursuant to options exercisable within 60
     days of August 15, 1997. Mr. Kotowski is the President of U.S. Operations
     of Rapiscan U.S.A. See "Management."
(11) Includes 13,500 shares issuable pursuant to options exercisable within 60
     days of August 15, 1997. Mr. Mansouri is the Vice President-Corporate
     Marketing of UDT Sensors. See "Management."
(12) Includes 15,187 shares issuable pursuant to options exercisable within 60
     days of August 15, 1997. Mr. Hickman is the Managing Director of OSI
     Singapore and OSI Malaysia. See "Management."
 
                                      52
<PAGE>
 
(13) Includes 2,813 shares issuable pursuant to options exercisable within 60
     days of August 15, 1997. Includes 22,500 shares held by the Steve Cary
     Good & Bari Anne Good Trust and 15,000 shares held individually by
     Mr. Good. Does not include shares beneficially owned by the Good Swartz &
     Berns Pension Fund. Mr. Good is a Director of the Company. See
     "Management."
(14) Includes 2,813 shares issuable pursuant to options exercisable within 60
     days of August 15, 1997. Includes 217,500 shares held jointly by Mr. Syal
     and his wife, Mohini Syal. Mr. Syal is a Director of the Company. See
     "Management."
(15) Includes 15,000 shares held by the Meyer and Doreen Luskin Family Trust.
     Does not include shares beneficially owned by Scope Industries. Includes
     8,438 shares issuable pursuant to options exercisable within 60 days of
     August 15, 1997. Mr. Luskin is the President, Chief Executive Officer,
     Chairman of the Board and a principal shareholder of Scope Industries.
(16) Does not include shares beneficially owned by Steven C. Good, Mark and
     Penny Berns Trust, Arnold G. and Hope Anisgarten and Rajiv Mehra. Steven
     C. Good and Mark S. Berns are the trustees of the Good Swartz & Berns
     Pension & Profit Sharing Plan.
(17) Includes 6,429 shares held by Surendra V. Jain M.D. Inc.
 
                                      53
<PAGE>
 
                         DESCRIPTION OF CAPITAL STOCK
 
  The authorized capital stock of the Company currently consists of 40,000,000
shares of Common Stock and 10,000,000 shares of preferred stock.
 
COMMON STOCK
 
  As of August 15, 1997, 6,156,528 shares of Common Stock were outstanding,
held of record by 79 shareholders. After completion of the Offering, there
will be 9,486,528 shares of Common Stock outstanding.
 
  The holders of Common Stock are entitled to one vote for each share held of
record on all matters submitted to a vote of the shareholders. The holders of
Common Stock are entitled to cumulative voting rights with respect to the
election of directors so long as at least one shareholder has given notice at
the meeting of shareholders prior to the voting of that shareholder's desire
to cumulate votes. Subject to preferences that may be applicable to any shares
of preferred stock issued in the future, holders of Common Stock are entitled
to receive ratably such dividends as may be declared by the Board of Directors
out of funds legally available therefore. See "Dividend Policy." In the event
of a liquidation, dissolution or winding up of the Company, holders of the
Common Stock are entitled to share ratably with the holders of any then
outstanding preferred stock in all assets remaining after payment of
liabilities and the liquidation preference of any then outstanding preferred
stock. Holders of Common Stock have no preemptive rights and no right to
convert their Common Stock into any other securities. There are no redemption
or sinking fund provisions applicable to the Common Stock. All outstanding
shares of Common Stock are, and all shares of Common Stock to be outstanding
upon completion of the Offering will be, fully paid and nonassessable.
 
PREFERRED STOCK
 
  The Board of Directors has authority to issue up to 10,000,000 shares of
preferred stock, no par value, and to fix the rights, preferences, privileges
and restrictions, including voting rights, of those shares without any future
vote or action by the shareholders. The rights of the holders of the Common
Stock will be subject to, and may be adversely affected by, the rights of the
holders of any preferred stock that may be issued in the future. The issuance
of preferred stock could have the effect of making it more difficult for a
third party to acquire a majority of the outstanding voting stock of the
Company, thereby delaying, deferring or preventing a change in control of the
Company. Furthermore, such preferred stock may have other rights, including
economic rights senior to the Common Stock, and, as a result, the issuance
thereof could have a material adverse effect on the market value of the Common
Stock. The Company has no present plans to issue shares of preferred stock. No
shares of preferred stock are currently outstanding.
 
STOCK TRANSFER AGENT AND REGISTRAR
 
  The transfer agent and registrar for the Company's Common Stock is U.S.
Stock Transfer Corporation.
 
                                      54
<PAGE>
 
                        SHARES ELIGIBLE FOR FUTURE SALE
 
  Upon completion of this Offering, the Company will have 9,486,528 shares of
Common Stock outstanding (assuming no exercise of stock options after August
15, 1997). Of these shares, the 3,700,000 shares sold in this Offering
(4,255,000 shares if the Underwriters' over-allotment option is exercised in
full) will be freely tradeable without restriction or registration under the
Securities Act unless they are purchased by "affiliates" of the Company as
that term is defined under Rule 144. The remaining 5,786,528 shares will be
"restricted securities" as defined in Rule 144 ("Restricted Shares"). Of such
Restricted Shares, approximately 5,761,000 Restricted Shares (or approximately
5,206,000 if the Underwriters' over-allotment option is exercised in full) are
subject to lock-up agreements with the Underwriters. See "Underwriting."
 
  Future sales of substantial amounts of Common Stock in the public market
could adversely affect prevailing market prices and adversely affect the
Company's ability to raise additional capital in the capital markets at a time
and price favorable to the Company. As a result of the lock-up agreements and
the provisions of Rule 144(k), Rule 144 and Rule 701, all currently
outstanding shares will be available for sale in the public market upon
expiration of the lock-up agreements 180 days after the date of this
Prospectus, subject to the provisions of Rule 144 and Rule 701.
 
  In general, under Rule 144 as currently in effect, any person (or persons
whose shares are aggregated) who has beneficially owned Restricted Shares for
at least one year is entitled to sell, within any three-month period, a number
of shares that does not exceed the greater of 1.0% of the then outstanding
shares of the Company's Common Stock (approximately 94,865 shares immediately
after this Offering) or the average weekly trading volume during the four
calendar weeks preceding such sale. Sales under Rule 144 are also subject to
certain requirements as to the manner of sale, notice and availability of
current public information about the Company. A person who is not an
affiliate, has not been an affiliate within three months prior to the sale and
has beneficially owned the Restricted Shares for at least two years is
entitled to sell such shares under Rule 144(k) without regard to any of the
limitations described above.
 
  Subject to certain limitations on the aggregate offering price of a
transaction and other conditions, Rule 701 may be relied upon with respect to
the resale of securities originally purchased from the Company by its
employees, directors, officers, consultants or advisers between May 20, 1988,
the effective date of Rule 701, and the date the issuer becomes subject to the
reporting requirements of the Securities Exchange Act of 1934, as amended (the
"Exchange Act"), pursuant to written compensatory benefit plans or written
contracts relating to the compensation of such persons. In addition, the
Securities and Exchange Commission (the "Commission") has indicated that Rule
701 will apply to typical stock options granted by an issuer before it becomes
subject to the reporting requirements of the Exchange Act (including options
granted before May 20, 1988, if made in accordance with the Rule had it been
in effect), along with the shares acquired upon exercise of such options
beginning May 20, 1988 (including exercises after the date of this
Prospectus). Securities issued in reliance on Rule 701 are restricted
securities and, subject to the contractual restrictions described above,
beginning 90 days after the date of this Prospectus, such securities may be
sold: (i) by persons other than Affiliates, subject only to the manner of sale
provisions of Rule 144; and (ii) by Affiliates under Rule 144 without
compliance with its minimum holding period requirements.
 
  The Company intends to file a registration statement on Form S-8 under the
Securities Act to register the shares of Common Stock reserved for issuance
under the 1987 Plan and the 1997 Plan or previously issued upon the exercise
of options, thus permitting the resale of shares issued under such plans by
non-affiliates in the public market without restriction under the Securities
Act. The registration statement is expected to be filed within 90 days after
the date of this Prospectus and will automatically become effective upon
filing.
 
  Prior to this Offering, there has been no public market for the Common Stock
of the Company, and any sale of substantial amounts of Common Stock in the
open market may adversely affect the market price of Common Stock offered
hereby.
 
                                      55
<PAGE>
 
                                 UNDERWRITING
 
  The Underwriters (the "Underwriters") named below, acting through their
representatives, Robertson, Stephens & Company LLC, William Blair & Company,
L.L.C. and Volpe Brown Whelan & Company, LLC (the "Representatives"), have
severally agreed, subject to the terms and conditions of the Underwriting
Agreement by and among the Company, the Selling Shareholders and the
Underwriters, to purchase from the Company and the Selling Shareholders the
number of shares of Common Stock set forth opposite their respective names
below. The Underwriters are committed to purchase and pay for all of such
shares if any are purchased.
 
<TABLE>
<CAPTION>
                                                                       Number of
           Underwriter                                                  Shares
           -----------                                                 ---------
<S>                                                                    <C>
Robertson, Stephens & Company LLC.....................................
William Blair & Company, L.L.C........................................
Volpe Brown Whelan & Company, LLC.....................................
                                                                       ---------
  Total............................................................... 3,700,000
                                                                       =========
</TABLE>
 
  The Representatives have advised the Company and the Selling Shareholders
that the Underwriters propose to offer the shares of Common Stock at the
offering price set forth on the cover page of this Prospectus: (i) to the
public; and (ii) to certain dealers who will be offered a concession of not
more than $   per share, of which $   may be reallowed to other dealers. After
the consummation of this Offering, the public offering price, concession and
reallowance to dealers may be reduced by the Representatives. No such
reduction shall change the amount of proceeds to be received by the Company or
the Selling Shareholders as set forth on the cover page of this Prospectus.
 
  The Underwriters have been granted an option, exercisable during the 30-day
period after the date of this Prospectus, to purchase up to 555,000 additional
shares of Common Stock from certain Selling Shareholders at the same price per
share as the Company and the Selling Shareholders will receive for the
3,700,000 shares that the Underwriters have agreed to purchase in this
Offering. To the extent that the Underwriters exercise such option, each of
the Underwriters will have a firm commitment to purchase approximately the
same percentage thereof that the number of shares of Common Stock to be
purchased by it set forth in the above table bears to the total number of
shares of Common Stock listed in such table. The Underwriters may exercise
such option only to cover over-allotments made in connection with the sale of
Common Stock offered hereby.
 
  The Underwriting Agreement contains covenants of indemnity among the
Underwriters, the Company and the Selling Shareholders against certain civil
liabilities, including liabilities under the Securities Act.
 
  Pursuant to the terms of certain lock-up agreements, officers and directors
of the Company, the Selling Shareholders and certain other shareholders
holding collectively approximately 5,761,000 shares of the Company's Common
Stock outstanding prior to this Offering, have agreed with the Representatives
that except for the 3,700,000 shares being offered in this Offering, or the
shares sold pursuant to the over-allotment option, without the prior written
consent of Robertson, Stephens & Company LLC or as a gift or distribution to
one who agrees to be bound by these restrictions, until 180 days after the
effective date of this Prospectus (the "lock-up period"), they will not offer
to sell, contract to sell or otherwise dispose of any shares of Common Stock,
including shares issuable under options or warrants exercisable during the 180
days after the date of this Prospectus, any options or warrants to purchase
shares of Common Stock or any securities convertible into or exchangeable for
shares of Common Stock owned directly by such holders or with respect to which
they have the power of disposition. Approximately 5,761,000 shares of Common
Stock subject to the lock-up agreements will become eligible for immediate
public sale following expiration of the lock-up period, subject to the
provisions of the Securities Act and the Rules promulgated thereunder.
Robertson, Stephens & Company LLC may, in its sole discretion, and at any time
without notice, release all or a portion of the
 
                                      56
<PAGE>
 
securities subject to the lock-up agreements. See "Shares Eligible for Future
Sale." In addition, the Company has agreed that until the expiration of the
lock-up period, the Company will not, without the prior written consent of
Robertson, Stephens & Company LLC, offer, sell, contract to sell or otherwise
dispose of any shares of Common Stock, any options or warrants to purchase
Common Stock or any securities convertible into or exchangeable for shares of
Common Stock, other than the Company's sales of shares in this Offering, the
issuance of shares of Common Stock upon the exercise of outstanding stock
options, and the grant of options to purchase shares or the issuance of shares
of Common Stock under the Company's 1997 Plan.
 
  The Representatives have advised the Company that, pursuant to Regulation M
under the Securities Act, certain persons participating in this Offering may
engage in transactions, including stabilizing bids, syndicate covering
transactions or the imposition of penalty bids which may have the effect of
stabilizing or maintaining the market price of the Common Stock at a level
above that which might otherwise prevail in the open market. A "stabilizing
bid" is a bid for or the purchase of the Common Stock on behalf of the
Underwriters for the purpose of fixing or maintaining the price of the Common
Stock. A "syndicate covering transaction" is the bid for or the purchase of
the Common Stock on behalf of the Underwriters in connection with this
Offering. The Underwriters may also cover all or a portion of such short
position, by exercising the Underwriters' over-allotment option referred to
above. A "penalty bid" is an arrangement permitting the Representatives to
reclaim the selling concession otherwise accruing to an Underwriter or
syndicate member in connection with this Offering if the Common Stock
originally sold by such Underwriter or syndicate member is purchased by the
Representatives in a syndicate covering transaction and has therefore not been
effectively placed by such Underwriter or syndicate member. The
Representatives have advised the Company that such transactions may be
effected on the Nasdaq National Market or otherwise and, if commenced, may be
discontinued at any time.
 
  The Representatives have advised the Company that they do not intend to
confirm sales to any accounts over which they exercise discretionary
authority.
 
  Prior to this Offering, there has been no public market for the Company's
securities. The initial public offering price of the Common Stock was
determined by negotiation among the Company, the Selling Shareholders and the
Representatives. Among the factors considered in such negotiations were
prevailing market conditions, the results of operations of the Company in
recent periods, market valuations of publicly traded companies that the
Company and the Representatives believe to be comparable to the Company,
estimates of the business potential of the Company, the present state of the
Company's development, the current state of the industry and the economy as a
whole, and any other factors deemed relevant.
 
                                      57
<PAGE>
 
                                 LEGAL MATTERS
 
  The validity of the Common Stock offered hereby will be passed upon for the
Company by Troy & Gould Professional Corporation, Los Angeles, California.
Certain legal matters with respect to this Offering will be passed upon for
the Underwriters by Jones, Day, Reavis & Pogue, Los Angeles, California. As of
the date of this Prospectus, Troy & Gould Professional Corporation and certain
of its members collectively own 52,500 shares of the Company's Common Stock.
 
                                    EXPERTS
 
  The consolidated financial statements included in this Prospectus and the
related financial statement schedule included elsewhere in the Registration
Statement have been audited by Deloitte & Touche LLP, independent auditors, as
stated in their reports appearing herein and elsewhere in the Registration
Statement, and have been so included in reliance upon the reports of such firm
given upon their authority as experts in accounting and auditing.
 
                            ADDITIONAL INFORMATION
 
  The Company has filed with the Commission in Washington, D.C., a
Registration Statement onForm S-1 under the Securities Act with respect to the
Common Stock being offered hereby. As permitted by the rules and regulations
of the Commission, this Prospectus does not contain all the information set
forth in the Registration Statement and the exhibits and schedules thereto.
For further information with respect to the Company and the Common Stock
offered hereby, reference is made to the Registration Statement, and such
exhibits and schedules. A copy of the Registration Statement, and the exhibits
and schedules thereto, may be inspected without charge at the public reference
facilities maintained by the Commission in Room 1024, 450 Fifth Street N.W.,
Washington, D.C. 20549, and at the Commissions regional offices located at the
Northwestern Atrium Center, 500 West Madison Street, Chicago, Illinois 60661
and Seven World Trade Center, 13th Floor, New York, New York 10048, and copies
of all or any part of the Registration Statement may be obtained from such
offices upon payment of the fees prescribed by the Commission. In addition,
the Registration Statement may be accessed at the Commission's site on the
World Wide Web located at http://www.sec.gov. Statements contained in this
Prospectus as to the contents of any contract or other document are not
necessarily complete and, in each instance, reference is made to the copy of
such contract or document filed as an exhibit to the Registration Statement,
each such statement being qualified in all respects by such reference.
 
                                      58
<PAGE>
 
                               OSI SYSTEMS, INC.
 
                   INDEX TO CONSOLIDATED FINANCIAL STATEMENTS
 
<TABLE>
<CAPTION>
                                                                           PAGE
                                                                           ----
<S>                                                                        <C>
Report of Independent Auditors............................................ F-2
Consolidated Balance Sheets as of June 30, 1996 and 1997.................. F-3
Consolidated Statements of Operations for the Years Ended June 30, 1995,
 1996 and 1997............................................................ F-4
Consolidated Statements of Shareholders' Equity for the Years Ended June
 30, 1995, 1996 and 1997.................................................. F-5
Consolidated Statements of Cash Flows for the Years Ended June 30, 1995,
 1996 and 1997............................................................ F-6
Notes to Consolidated Financial Statements................................ F-8
</TABLE>
 
                                      F-1
<PAGE>
 
                        REPORT OF INDEPENDENT AUDITORS
 
OSI Systems, Inc.:
 
  We have audited the accompanying consolidated balance sheets of OSI Systems,
Inc. (the "Company") and its subsidiaries as of June 30, 1997 and 1996, and
the related consolidated statements of operations, shareholders' equity, and
cash flows for the years ended June 30, 1997, 1996 and 1995. These financial
statements are the responsibility of the Company's management. Our
responsibility is to express an opinion on these financial statements based on
our audits.
 
  We conducted our audits 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 misstatement. 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, such consolidated financial statements present fairly, in
all material respects, the financial position of OSI Systems, Inc. and its
subsidiaries as of June 30, 1997 and 1996, and the results of their operations
and their cash flows for the years ended June 30, 1997, 1996 and 1995 in
conformity with generally accepted accounting principles.
 
DELOITTE & TOUCHE LLP
 
Los Angeles, California
August 15, 1997
 
 
                                      F-2
<PAGE>
 
                       OSI SYSTEMS, INC. AND SUBSIDIARIES
 
                          CONSOLIDATED BALANCE SHEETS
 
                      (In thousands, except share amounts)
 
<TABLE>
<CAPTION>
                                                                   JUNE 30,
                                                                ---------------
                                                                 1996    1997
                                                                ------- -------
<S>                                                             <C>     <C>
                        ASSETS (NOTE 4)
Current Assets:
  Cash and cash equivalents (Note 1)........................... $   581 $   553
  Accounts receivable, net of allowance for doubtful accounts
   of $276 and $586 at June 30, 1996 and 1997, respectively
   (Note 1)....................................................  13,295  15,556
  Other receivables (Note 2)...................................     783   2,346
  Inventory (Note 1)...........................................  13,642  18,517
  Prepaid expenses.............................................     633     537
  Deferred income taxes (Notes 1 and 7)........................     700     874
                                                                ------- -------
    Total current assets.......................................  29,634  38,383
                                                                ------- -------
Property and Equipment, Net (Notes 1 and 4):...................   4,454   5,841
Intangible and Other Assets, Net (Notes 1, 2 and 3)............   1,221   3,109
                                                                ------- -------
    Total...................................................... $35,309 $47,333
                                                                ======= =======
             LIABILITIES AND SHAREHOLDERS' EQUITY
Current Liabilities:
  Bank lines of credit (Note 4)................................ $ 7,783 $ 9,100
  Current portion of long-term debt (Notes 6 and 13)...........   1,491   1,240
  Current portion of senior subordinated debt (Note 5).........   2,500
  Accounts payable (Note 1)....................................   6,522   7,712
  Accrued payroll and related expenses.........................   1,667   1,607
  Income taxes payable (Notes 1 and 7).........................     799   1,804
  Advances from customers......................................     219   2,410
  Other accrued expenses and current liabilities...............   2,609   3,710
                                                                ------- -------
    Total current liabilities..................................  23,590  27,583
Senior Subordinated Debt (Notes 1 and 5).......................     575
Long-Term Debt (Notes 1, 6 and 13).............................   3,113   2,840
Deferred Income Taxes (Notes 1 and 7)..........................     827     101
Minority Interest (Note 1).....................................      10
                                                                ------- -------
    Total liabilities..........................................  28,115  30,524
Commitments and Contingencies (Notes 8 and 13)
Shareholders' Equity (Notes 4, 5, 9 and 10):
  Preferred stock, voting shares, no par value; authorized,
   3,000,000 shares; issued and outstanding, 1,318,750 shares
   at June 30, 1996 and 0 shares at June 30, 1997 (Note 10)....   1,514
  Preferred stock, no par value; 10,000,000 shares authorized;
   none issued and outstanding at June 30, 1996 and 1997.......
  Common stock, no par value; authorized, 40,000,000 shares;
   issued and outstanding, 1,858,132 and 6,156,528 shares at
   June 30, 1996 and 1997, respectively........................     560   7,367
  Retained earnings............................................   4,994   9,171
  Cumulative foreign currency translation adjustment (Note 1)..     126     271
                                                                ------- -------
    Total shareholders' equity.................................   7,194  16,809
                                                                ------- -------
    Total...................................................... $35,309 $47,333
                                                                ======= =======
</TABLE>
 
 
          See accompanying notes to consolidated financial statements.
 
                                      F-3
<PAGE>
 
                       OSI SYSTEMS, INC. AND SUBSIDIARIES
 
                     CONSOLIDATED STATEMENTS OF OPERATIONS
 
               (In thousands, except share and per share amounts)
 
<TABLE>
<CAPTION>
                                                     YEAR ENDED JUNE 30,
                                                -------------------------------
                                                  1995       1996       1997
                                                ---------  ---------  ---------
<S>                                             <C>        <C>        <C>
Revenues (Note 1).............................. $  49,815  $  61,518  $  77,628
Cost of goods sold.............................    37,818     45,486     56,174
                                                ---------  ---------  ---------
Gross profit...................................    11,997     16,032     21,454
Operating expenses:
 Selling, general and administrative expenses
  (Notes 11 and 12)............................     7,601      9,757     11,304
 Research and development (Note 1).............     1,591      1,663      2,504
 Stock option compensation (Note 9)............       --         --         856
                                                ---------  ---------  ---------
Total operating expenses.......................     9,192     11,420     14,664
                                                ---------  ---------  ---------
Income from operations.........................     2,805      4,612      6,790
Interest expense (Notes 4, 5, 6 and 11)........     1,251      1,359      1,197
                                                ---------  ---------  ---------
Income before provision for income taxes and
 minority interest.............................     1,554      3,253      5,593
Provision for income taxes (Notes 1 and 7).....       413      1,111      1,416
                                                ---------  ---------  ---------
Income before minority interest in net loss of
 subsidiaries..................................     1,141      2,142      4,177
Minority interest in net loss of subsidiaries
 (Note 1)......................................        17        117        --
                                                ---------  ---------  ---------
Net income..................................... $   1,158  $   2,259  $   4,177
                                                =========  =========  =========
Historical net income.......................... $   1,158  $   2,259  $   4,177
Interest on subordinated debt, net of income
 taxes.........................................       216        166         92
Minority interest in net loss of subsidiaries..       (17)      (117)       --
                                                ---------  ---------  ---------
Net income available to common shareholders.... $   1,357  $   2,308  $   4,269
                                                =========  =========  =========
Net income per share (Note 1).................. $    0.22  $    0.38  $    0.68
                                                =========  =========  =========
Weighted average shares
 outstanding................................... 6,172,901  6,134,669  6,263,963
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                      F-4
<PAGE>
 
                       OSI SYSTEMS, INC. AND SUBSIDIARIES
 
                CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY
                      (In thousands, except share amounts)
 
<TABLE>
<CAPTION>
                                                                        CUMULATIVE
                             PREFERRED             COMMON                 FOREIGN
                         -------------------  ----------------           CURRENCY
                         NUMBER OF            NUMBER OF        RETAINED TRANSLATION
                           SHARES    AMOUNT    SHARES   AMOUNT EARNINGS ADJUSTMENT   TOTAL
                         ----------  -------  --------- ------ -------- ----------- -------
<S>                      <C>         <C>      <C>       <C>    <C>      <C>         <C>
BALANCE, JULY 1, 1994...  1,123,750  $ 1,124  1,703,257 $  363  $1,577     $ 64     $ 3,128
  Exercise of stock
   options..............     35,000       70     60,000     75     --       --          145
  Conversion of debt....    160,000      320     78,750    105     --       --          425
  Translation
   adjustment...........        --       --         --     --      --        95          95
  Net income............        --       --         --     --    1,158      --        1,158
                         ----------  -------  --------- ------  ------     ----     -------
BALANCE, JUNE 30, 1995..  1,318,750    1,514  1,842,007    543   2,735      159       4,951
  Exercise of stock
   options..............        --       --      16,125     17     --       --           17
  Translation
   adjustment...........        --       --         --     --      --       (33)        (33)
  Net income............        --       --         --     --    2,259      --        2,259
                         ----------  -------  --------- ------  ------     ----     -------
BALANCE, JUNE 30, 1996..  1,318,750    1,514  1,858,132    560   4,994      126       7,194
  Exercise of stock
   options..............        --       --     118,125    146     --       --          146
  Conversion of debt....  1,250,000    2,500    120,536    225     --       --        2,725
  Minority interest
   acquisitions.........        --       --     206,610  1,566     --       --        1,566
  Conversion of
   preferred stock...... (2,568,750)  (4,014) 3,853,125  4,014     --       --          --
  Stock option
   compensation.........        --       --         --     856     --       --          856
  Translation
   adjustment...........        --       --         --     --      --       145         145
  Net income............        --       --         --     --    4,177      --        4,177
                         ----------  -------  --------- ------  ------     ----     -------
BALANCE, JUNE 30, 1997..        --   $   --   6,156,528 $7,367  $9,171     $271     $16,809
                         ==========  =======  ========= ======  ======     ====     =======
</TABLE>
 
 
          See accompanying notes to consolidated financial statements.
 
                                      F-5
<PAGE>
 
                       OSI SYSTEMS, INC. AND SUBSIDIARIES
 
                     CONSOLIDATED STATEMENTS OF CASH FLOWS
                                 (In thousands)
 
<TABLE>
<CAPTION>
                                                       YEAR ENDED JUNE 30,
                                                     -------------------------
                                                      1995     1996     1997
                                                     -------  -------  -------
<S>                                                  <C>      <C>      <C>
Cash flows from operating activities:
  Net income........................................ $ 1,158  $ 2,259  $ 4,177
  Adjustments to reconcile net income to net cash
   provided by (used in) operating activities:
   Minority interest in net loss of subsidiaries....     (17)    (117)
   Provision for losses on accounts receivable......     (70)     404      389
   Depreciation and amortization....................   1,551    2,014    2,302
   Stock option compensation........................                       856
   Deferred income taxes............................     240      (12)    (900)
   Gain on sale of property and equipment...........     (11)     (13)
   Changes in operating assets and liabilities, net
    of business acquisition:
     Accounts receivable............................  (1,239)    (858)  (1,980)
     Other receivables..............................     226     (194)  (1,530)
     Inventory......................................  (2,599)  (4,068)  (4,573)
     Prepaid expenses...............................    (139)    (245)      96
     Accounts payable...............................     221      120    1,026
     Accrued payroll and related expenses...........     191      707      (60)
     Income taxes payable...........................    (217)     652    1,005
     Advances from customers........................       9      183    1,448
     Other accrued expenses and current
      liabilities...................................     (87)    (827)   1,101
                                                     -------  -------  -------
       Net cash provided by (used in) operating
        activities..................................    (783)       5    3,357
                                                     -------  -------  -------
Cash flows from investing activities:
  Proceeds from sale of property and equipment......     142      120
  Additions to property and equipment...............  (1,396)  (1,612)  (2,182)
  Cash paid for business acquisition, net of cash
   acquired.........................................                      (848)
  Cash paid for minority interest...................    (160)
  Other assets......................................    (662)    (688)      23
                                                     -------  -------  -------
       Net cash used in investing activities........  (2,076)  (2,180)  (3,007)
                                                     -------  -------  -------
Cash flows from financing activities:
  Net proceeds from (repayment of) bank lines of
   credit...........................................   2,668    1,502    1,014
  Payments on senior subordinated debt..............    (700)             (350)
  Payments on junior subordinated debt..............    (280)
  Payments on long-term debt........................  (1,095)  (1,250)  (3,983)
  Proceeds from issuance of long-term debt..........   2,806    1,097    2,647
  Proceeds from exercise of stock options and
   warrants.........................................     145       17      146
  Proceeds from issuance of minority interest.......               21
                                                     -------  -------  -------
       Net cash provided by (used in) financing
        activities..................................   3,544    1,387     (526)
                                                     -------  -------  -------
Effect of exchange rate changes on cash.............      95      (36)     148
                                                     -------  -------  -------
Net (decrease) increase in cash.....................     780     (824)     (28)
Cash, beginning of period...........................     625    1,405      581
                                                     -------  -------  -------
Cash, end of period................................. $ 1,405  $   581  $   553
                                                     =======  =======  =======
Supplemental disclosures of cash flow information--
 Cash paid during the period for:
  Interest.......................................... $ 1,229  $ 1,346  $ 1,197
  Income taxes...................................... $    82  $   377  $ 1,511
</TABLE>
 
          See accompanying notes to consolidated financial statements.
 
                                      F-6
<PAGE>
 
- ---------------
SUPPLEMENTAL DISCLOSURES OF NONCASH INVESTING AND FINANCING ACTIVITIES:
 
  During 1995, certain related parties converted $105 and $320 of junior and
senior subordinated debt into 78,750 and 160,000 shares of common and
preferred stock, respectively.
 
  During 1995, the Company refinanced $1,244 in long-term debt obligations
through a new financing arrangement with a bank.
 
  During 1997, certain related parties converted $225 and $2,500 of senior
subordinated debt into 120,536 and 1,250,000 shares of common and preferred
stock, respectively.
 
  During October and December 1996, the Company acquired the minority interest
of its two majority-owned subsidiaries through the issuance of 178,956 shares
of common stock, at an estimated fair value of $6.67 per share. An additional
27,654 shares, at an estimated fair value of $13.50 per share, are issuable at
June 30, 1997. The excess of the fair value of the common stock of $1,566 over
the book value of the minority interests of $12 has been recorded as goodwill.
 
  In 1997, the Company acquired all of the capital stock of Advanced Micro
Electronics AS. In conjunction with the acquisition, liabilities were assumed
as follows:
<TABLE>
<CAPTION>
   <S>                                                                   <C>
   Fair value of assets acquired........................................ $2,350
   Goodwill.............................................................    588
   Cash paid for the capital stock......................................   (916)
                                                                         ------
   Liabilities assumed.................................................. $2,022
                                                                         ======
</TABLE>
 
 
         See accompanying notes to consolidated financial statements.
 
                                      F-7
<PAGE>
 
                      OSI SYSTEMS, INC. AND SUBSIDIARIES
 
                  NOTES TO CONSOLIDATED FINANCIAL STATEMENTS
 
1. SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
 
  General -- OSI Systems, Inc. (formerly Opto Sensors, Inc.) and its
subsidiaries (collectively, the "Company") is a vertically integrated,
worldwide provider of devices, subsystems and end-products based on
optoelectronic technology. The Company designs and manufactures optoelectronic
devices and value-added subsystems for original equipment manufacturers
("OEMs") in a broad range of applications, including security, medical
diagnostics, telecommunications, office automation, aerospace, computer
peripherals and industrial automation. In addition, the Company utilizes its
optoelectronic technology and design capabilities to manufacture security and
inspection products that it markets worldwide to end users under the
"Rapiscan" brand name. These products are used to inspect baggage, cargo and
other objects for weapons, explosives, drugs and other contraband.
 
  Consolidation -- The consolidated financial statements include the accounts
of OSI Systems, Inc. and its majority-owned subsidiaries. All significant
intercompany accounts and transactions have been eliminated in consolidation.
In October and December 1996 the Company purchased the minority interests of
its two majority-owned subsidiaries by exchanging 178,956 shares of common
stock for the minority shares of the subsidiaries. The excess of the fair
value of the common stock issued of $1,193,000 over the carrying value of the
minority interest of $12,000 has been recorded as goodwill and is being
amortized over a period of 20 years. The Company also agreed to issue
additional shares of the Company's common stock to the selling shareholders of
one of the subsidiaries. The number of shares to be issued is based upon the
pre-tax income of the subsidiary for the year ended June 30, 1997, and has
been determined to be 27,654 shares and have been included in the number of
shares issued for minority interest acquisitions in the accompanying 1997
consolidated statement of shareholders' equity.
 
  Concentrations of Credit Risk -- The Company's financial instruments that
are exposed to credit risk consist primarily of accounts receivable. The
Company performs ongoing credit evaluations of its customers' financial
condition and provides an allowance for potential credit losses. The
concentration of credit risk is generally diversified due to the large number
of entities comprising the Company's customer base and their geographic
dispersion.
 
  Inventory -- Inventory is stated at the lower of cost or market; cost is
determined on the first-in, first-out method.
 
  Inventory at June 30, 1996 and 1997 consisted of the following (in
thousands):
 
<TABLE>
<CAPTION>
                                                                    JUNE 30,
                                                                 ---------------
                                                                  1996    1997
                                                                 ------- -------
   <S>                                                           <C>     <C>
   Raw materials................................................ $ 7,795 $11,408
   Work-in-process..............................................   3,114   4,224
   Finished goods...............................................   2,733   2,885
                                                                 ------- -------
     Total...................................................... $13,642 $18,517
                                                                 ======= =======
</TABLE>
 
                                      F-8
<PAGE>
 
                      OSI SYSTEMS, INC. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
  Property and Equipment -- Property and equipment are stated at cost.
Depreciation and amortization are computed using the straight-line and
accelerated methods over lives ranging from three to ten years. Amortization
of leasehold improvements is calculated on the straight-line basis over the
shorter of the useful life of the asset or the lease term.
 
  Property and equipment at June 30, 1996 and 1997 consisted of the following
(in thousands):
 
<TABLE>
<CAPTION>
                                                                   JUNE 30,
                                                                ---------------
                                                                 1996    1997
                                                                ------- -------
   <S>                                                          <C>     <C>
   Equipment................................................... $ 6,280 $ 7,545
   Leasehold improvements......................................   1,601   2,093
   Tooling.....................................................   1,558   1,967
   Furniture and fixtures......................................     488     666
   Computer equipment..........................................   1,283   1,699
   Vehicles....................................................      93     176
                                                                ------- -------
     Total.....................................................  11,303  14,146
   Less accumulated depreciation and amortization..............   6,849   8,305
                                                                ------- -------
   Property and equipment, net................................. $ 4,454 $ 5,841
                                                                ======= =======
</TABLE>
 
  Intangibles and Other Assets -- Intangible and other assets at June 30, 1996
and 1997 consisted of the following (in thousands):
<TABLE>
<CAPTION>
                                                                   JUNE 30,
                                                                ---------------
                                                                 1996    1997
                                                                ------- -------
   <S>                                                          <C>     <C>
   Software development costs.................................. $   588 $   588
   Goodwill....................................................     --    2,142
   Deposits....................................................     262     320
   Other.......................................................     524     444
                                                                ------- -------
     Total.....................................................   1,374   3,494
   Less accumulated amortization...............................     153     385
                                                                ------- -------
   Intangible and other assets, net............................ $ 1,221 $ 3,109
                                                                ======= =======
</TABLE>
 
  Goodwill in the amount of $1,554,000 resulting from the acquisition of
minority interests and $588,000 resulting from the acquisition of Advanced
Micro Electronics AS (see Note 3) is being amortized, on a straight-line
basis, over a period of twenty years.
 
  Software development costs incurred in the research and development of
software products are expensed as incurred until the technological feasibility
of the product has been established. After technological feasibility is
established, certain software development costs are capitalized. The software,
once developed, is a component which is included in X-ray security machines
when they are sold to customers. The Company amortizes these costs on a
straight-line basis over a two-year period. No software development costs were
capitalized during the year ended June 30, 1997.
 
  Impairment of Long-Lived Assets -- The Company reviews long-lived assets,
including goodwill, for impairment whenever events or changes in circumstances
indicate that the carrying amount of the asset may not be recoverable. If the
sum of the expected future cash flows, undiscounted and without interest
charges, is less than the carrying amount of the asset, the Company recognizes
an impairment loss based on the estimated fair value of the asset.
 
 
                                      F-9
<PAGE>
 
                      OSI SYSTEMS, INC. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
  Income Taxes -- Deferred income taxes are provided for temporary differences
between the financial statement and income tax bases of the Company's assets
and liabilities, based on enacted tax rates. A valuation allowance is provided
when it is more likely than not that some portion or all of the deferred
income tax assets will not be realized.
 
  Fair Value of Financial Instruments -- The Company's financial instruments
consist primarily of cash accounts receivable, accounts payable, and debt
instruments. The carrying values of financial instruments other than debt
instruments, are representative of their fair values due to their short-term
maturities. The carrying values of the Company's long-term debt instruments
are considered to approximate their fair values because the interest rates of
these instruments are variable or comparable to current rates offered to the
Company. The fair value of the Company's senior subordinated debt cannot be
determined due to the related-party nature of the obligations.
 
  Revenue Recognition-- The Company recognizes revenue upon shipment of its
product.
 
  Foreign Currency Translation -- The accounts of the Company's operations in
Singapore, Malaysia, Norway and the United Kingdom are maintained in Singapore
dollars, Malaysian ringgits, Norwegian Krone and U.K. pounds sterling,
respectively. Foreign currency financial statements are translated into U.S.
dollars at current rates, with the exception of revenues, costs and expenses,
which are translated at average rates during the reporting period. Gains and
losses resulting from foreign currency transactions are included in income,
while those resulting from translation of financial statements are excluded
from income and accumulated as a component of shareholders' equity.
Transaction (losses) gains of approximately $76,000, ($123,000), and $68,000
were included in income for the years ended June 30, 1995, 1996 and 1997,
respectively.
 
  Earnings Per Share -- Earnings per share information is computed using the
weighted average number of shares of common stock outstanding and dilutive
common equivalent shares from preferred stock, convertible debt and stock
options using the treasury stock method. Pursuant to Securities and Exchange
Commission Staff Accounting Bulletin Topic 4D, common stock and stock options
issued or granted during the twelve month period prior to the date of the
initial filing of the Company's Form S-1 Registration Statement have been
included in the calculation of the weighted average number of common and
common equivalent shares using the treasury stock method as if they were
outstanding for each period. Net income and net income per share have been
presented to reflect the effect of the conversion of the preferred stock into
shares of the Company's common stock (see Notes 5 and 10).
 
  Recently Issued Accounting Pronouncements -- In February 1997, the Financial
Accounting Standards Board issued Statement of Financial Accounting Standards
("SFAS") No. 128 "Earnings Per Share". The statement is effective for interim
periods and fiscal years ending after December 15, 1997. The Company does not
expect that the statement will have a material effect on the Company's
consolidated financial statements.
 
  In June 1997, the Financial Accounting Standards Board issued Statement of
Financial Accounting Standards No. 130, "Reporting for Comprehensive Income"
and No. 131, "Disclosure about Segments of an Enterprise and Related
Information." These statements are effective for financial statements issued
for periods beginning after December 15, 1997. The Company has not yet
analyzed the impact of adopting these statements.
 
  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 reported amounts of assets and
liabilities and disclosure of contingent assets and liabilities at the date of
the financial statements and the reported amounts of revenues and expenses
during the reporting period. Actual results could differ from those estimates.
 
                                     F-10
<PAGE>
 
                      OSI SYSTEMS, INC. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
2. INVESTMENT IN JOINT VENTURE
 
  In January 1995, the Company, together with an unrelated company, formed
ECIL-Rapiscan Security Products Limited, a joint venture organized under the
laws of India. The Company, the Company's chairman and the Company's chief
financial officer have a 36.0%, 10.5% and 4.5% ownership interest,
respectively, in the joint venture. The Company's investment of approximately
$108,000 at June 30, 1997 is included in other assets in the accompanying
financial statements and the Company's equity in the earnings of the joint
venture, since its inception, have been insignificant.
 
  The joint venture was formed for the purpose of the manufacture, assembly,
service and testing of X-ray security and other products. One of the Company's
subsidiaries is a supplier to the joint venture partner, who in turn
manufactures and sells the resulting products to the joint venture utilizing
technology received from the subsidiary. The agreement provides for technology
transfer between the Company and the joint venture, subject to certain
restrictions.
 
  During the year ended June 30, 1995 and 1997, the Company earned a technical
fee from the joint venture in the amount of $200,000 and $115,000,
respectively. At June 30, 1997, $100,000 was unpaid and included in other
receivables in the accompanying consolidated financial statements.
 
3. ACQUISITIONS
 
  On March 3, 1997, the Company acquired the capital stock of Advanced Micro
Electronics AS ("AME") headquartered in Horten, Norway, from Industriinvestor
ASA. The cash purchase price amounted to $916,000. The acquisition has been
accounted for by the purchase method of accounting, and accordingly, the
purchase price has been allocated to the assets acquired of $2,350,000, and
liabilities assumed of $2,022,000, based on the estimated fair values of the
assets and liabilities at the date of acquisition. The excess of the purchase
price over the fair value of net assets acquired is being amortized over a
period of 20 years.
 
  The results of operations of AME are included in the Company's consolidated
financial statements from the date of acquisition. Had the acquisition
occurred as of July 1, 1994, pro forma consolidated sales for the years ended
June 30, 1995, 1996 and 1997 would have been $53,338,000, $65,371,000, and
$79,871,000, respectively. Consolidated pro forma net income and net income
per share would not have been materially different than the amounts reported
for the respective periods.
 
4. BANK AGREEMENTS
 
  At June 30, 1996 and 1997, line of credit borrowings consisted of the
following (in thousands):
 
<TABLE>
<CAPTION>
                                                                    JUNE 30,
                                                                  -------------
                                                                   1996   1997
                                                                  ------ ------
   <S>                                                            <C>    <C>
   Line of credit -- U.S......................................... $6,361 $6,577
   Line of credit -- Singapore...................................  1,422    974
   Line of credit -- Norway......................................           586
   Line of credit -- Rapiscan U.K. ..............................           963
                                                                  ------ ------
     Total bank lines of credit.................................. $7,783 $9,100
                                                                  ====== ======
</TABLE>
 
                                     F-11
<PAGE>
 
                      OSI SYSTEMS, INC. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
  The Company maintains a senior loan agreement with a U.S. bank, which
provides for a $10,000,000 revolving line of credit, a $2,500,000 term loan, a
$1,000,000 equipment line and a $1,500,000 stock purchase facility (see Note
6). Total borrowings under the agreement are not to exceed $15,000,000.
Borrowings under the line of credit bear interest at the bank's prime rate
(8.5% at June 30, 1997) plus .25% or, at the Company's option, at 2.25% above
the LIBOR rate for specific advances and terms. Interest is payable monthly,
and the line expires in November 1998. Borrowings under the senior loan
agreement are collateralized by substantially all of the assets of the
Company. At June 30, 1997 approximately $5,077,000 was issued and outstanding
under the revolving line of credit. The agreement also provides a commitment
for letters of credit up to $10,000,000 not to exceed the available balance
under the line of credit. At June 30, 1997 approximately $154,000 was issued
and outstanding under letters of credit.
 
  Covenants in connection with the agreement impose restrictions and
requirements related to, among other things, maintenance of certain financial
ratios, limitations on outside indebtedness, rental expense and capital
expenditures.
 
  The Company has a credit agreement with a U.S. bank, which provides for a
$5,000,000 revolving line of credit and a $4,000,000 letter of credit sub-
facility. Total borrowings under the agreement may not exceed $5,000,000.
Borrowings under the line of credit bear interest at the bank's prime rate
(8.5% at June 30, 1997) plus .25%. Interest is payable monthly, and the line
expires in October 1997. Borrowings under the current agreement are secured by
certain of the Company's assets. At June 30, 1997 $1,500,000 was issued and
outstanding under the revolving line of credit. The agreement also provides a
commitment for letters of credit up to $4,000,000. At June 30, 1997
approximately $1,917,000 was issued and outstanding under letters of credit.
 
  Covenants in connection with the agreement impose restrictions and
requirements related to, among other things, maintenance of certain financial
ratios, limitations on outside indebtedness, profitability, and capital
expenditures.
 
  Opto Sensors Pte. Ltd. ("OSP") has a loan agreement with a Singapore bank,
which provides for revolving line of credit borrowings up to 2,600,000
Singapore dollars (approximately $1,800,000 at June 30, 1997). The agreement
also has a term note feature providing for borrowings up to approximately
$300,000 (see Note 6). Borrowings under the line of credit bear interest at
the bank's prime rate (8.5% at June 30, 1997) plus 1.5%. Interest is payable
monthly, and borrowings are due on demand. Borrowings under the line of credit
are collateralized by certain OSP assets and are guaranteed by the Company and
certain officers of the Company.
 
  AME has a loan agreement with a Norwegian bank, which provides for revolving
line of credit borrowings up to 5,000,000 Norwegian Krone (approximately
$682,000 at June 30, 1997). Borrowings under the line of credit bear interest
at a variable rate, which was 6.65% at June 30, 1997. Interest is payable
quarterly. The loan agreement has no expiration date. Borrowings under the
line of credit are collateralized by certain AME assets.
 
  A subsidiary has loan agreements with a U.K. bank, which provide for
overdraft borrowings of up to 1,250,000 pound sterling (approximately
$2,081,000 at June 30, 1997), line of credit borrowings up to 750,000 pound
sterling (approximately $1,248,000 at June 30, 1997) and a 500,000 pound
sterling (approximately $832,000 at June 30, 1997) borrowing facility for
tender and performance bonds. Borrowings under the overdraft facility bear
interest at a base rate (6.0% at June 30, 1997) plus 2%. The overdraft
facility expires in December 1997. At June 30, 1997 no amounts were
outstanding under the overdraft facility. Borrowings under the line of credit
bear interest at the base rate plus 1.85%. Interest is payable monthly and the
line expires in November 1997. Borrowings under this agreement are secured by
certain assets of the subsidiary and are guaranteed by the Company.
Approximately $452,000 was outstanding under performance bonds at June 30,
1997.
 
                                     F-12
<PAGE>
 
                      OSI SYSTEMS, INC. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
  A subsidiary has a loan agreement with a Malaysian bank, which provides for
revolving line of credit borrowings up to 2,500,000 Malaysian ringgits
(approximately $990,000 at June 30, 1997) for performance bonds and standby
letter of credits. This line expires in October 1997. No amounts were
outstanding under this agreement at June 30, 1997.
 
5. SENIOR SUBORDINATED DEBT
 
  The Company has issued convertible notes payable to non affiliates and
certain related parties. Under the terms of the various agreements, certain
debt contained nondetachable warrants to convert the related debt into shares
of the Company's preferred stock at $2.00 per share. Certain other notes
provided for the conversion of the debt into shares of the Company's preferred
stock at $2.80 per share at the option of the holder. The remaining debt, at
the option of the holder, provided for conversion of the debt into shares of
the Company's common stock at $1.87 per share. During the year ended June 30,
1997, all of the debt outstanding under the various agreements was repaid or
converted in accordance with the conversion terms as summarized in the
following table:
 
<TABLE>
<CAPTION>
                                                                         JUNE 30,
                                                                      --------------
                                                                       1996    1997
                                                                      ------  ------
                                                                      (In thousands)
<S>                                                                  <C>    <C>
Convertible note payable to a related party, interest due quarterly
 at a bank's prime rate (8.25% at June 30, 1996) plus 1.5%,
 principal due on April 24, 1997 converted into 1,250,000 shares of
 preferred stock on November 27, 1996..............................  $2,500 $--

Convertible notes payable, (including $50,000 to a related party)
 interest due quarterly at a bank'sprime rate (8.25% at June 30,
 1996) plus 1.5%, principal due on February 19, 1998, paid in full
 as of October 28, 1996............................................     350  --

Convertible notes payable to directors, interest due quarterly at a
 bank's prime rate (8.25% at June 30, 1996) plus 1.5%, principal
 due on February 19, 1998, converted into 26,786 shares of common
 stock on October 31, 1996.........................................      50  --

Convertible notes payable, interest due quarterly at a bank's prime
 rate (8.25% at June 30, 1996) plus 1.5%, principal due on February
 19, 1998 converted into 93,750 shares of common stock on October
 31, 1996..........................................................     175  --
                                                                     ------ ----
Total senior subordinated debt.....................................   3,075  --
Less current portion...............................................   2,500  --
                                                                     ------ ----
Total long-term portion............................................  $  575 $--
                                                                     ====== ====
</TABLE>
 
                                     F-13
<PAGE>
 
                       OSI SYSTEMS, INC. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
6. LONG-TERM DEBT
 
  At June 30, 1996 and 1997, long-term debt consisted of the following:
 
<TABLE>
<CAPTION>
                                                                    JUNE 30,
                                                                  -------------
                                                                   1996   1997
                                                                  ------ ------
                                                                  (In thousands)
<S>                                                               <C>    <C>
Term loan payable to a bank, interest due monthly at the bank's
 prime rate (8.25% at June 30, 1996) plus 0.25%, principal due
 in monthly installments of $52,083. The term loan was repaid in
 January 1997...................................................  $1,667    --
Term loan payable to a bank, interest due monthly at the bank's
 prime rate (8.25% at June 30, 1996) plus 0.25%, principal due
 in equal monthly installments of $16,666. The term loan was
 repaid in January 1997.........................................     750    --
Equipment line note payable to a bank, interest due monthly at
 the bank's prime rate (8.25% at June 30, 1996) plus 0.25%,
 principal due in monthly installments of $11,623. The term loan
 was repaid in January 1997.....................................     511    --
Term loan payable to a bank, interest due monthly at the bank's
 prime rate (8.5% at June 30, 1997) plus 0.50%, principal due in
 monthly installments of $52,083 until paid in full on March 31,
 2001. Outstanding balances are collateralized by substantially
 all of the assets of the Company...............................     --  $2,344
Term loan payable to a Norwegian bank, interest due quarterly at
 a rate of 5.75% principal due in monthly installments of
 $12,129 until paid in full on June 1, 2001. Outstanding
 balances are collateralized by certain assets of the
 subsidiary.....................................................     --     437
Term loan payable to a bank, interest due monthly at the bank's
 prime rate (8.5% at June 30, 1997) plus 2.25%, principal due in
 monthly installments of $8,333 until paid in full on November
 30, 1997.......................................................     141     41
Liability under settlement agreements, interest computed at the
 52 week treasury bill rate (5.35% at June 30, 1997), principal
 due $300,000 in 1998, and $400,000 in 1999.....................   1,000    700
Other...........................................................     535    558
                                                                  ------ ------
                                                                   4,604  4,080
Less current portion of long-term debt..........................   1,491  1,240
                                                                  ------ ------
Long-term portion of debt.......................................  $3,113 $2,840
                                                                  ====== ======
</TABLE>
 
  Fiscal year principal payments of long-term debt as of June 30, 1997 are as
follows (in thousands):
 
<TABLE>
   <S>                                                                    <C>
   1998.................................................................. $1,240
   1999..................................................................  1,333
   2000..................................................................    896
   2001..................................................................    592
   2002..................................................................     19
                                                                          ------
     Total............................................................... $4,080
                                                                          ======
</TABLE>
 
                                      F-14
<PAGE>
 
                      OSI SYSTEMS, INC. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
7. INCOME TAXES
 
  For financial reporting purposes, income before provision for income taxes
and minority interest includes the following components (in thousands):
 
<TABLE>
<CAPTION>
                                                            YEAR ENDED JUNE 30,
                                                            --------------------
                                                             1995   1996   1997
                                                            ------ ------ ------
   <S>                                                      <C>    <C>    <C>
   Pretax income:
     United States......................................... $1,277 $1,965 $2,655
     Foreign...............................................    277  1,288  2,938
                                                            ------ ------ ------
       Total pretax income................................. $1,554 $3,253 $5,593
                                                            ====== ====== ======
</TABLE>
 
  The Company's provision for income taxes is comprised of the following (in
thousands):
 
<TABLE>
<CAPTION>
                                                             YEAR ENDED JUNE
                                                                   30,
                                                            -------------------
                                                            1995  1996    1997
                                                            ---- ------  ------
   <S>                                                      <C>  <C>     <C>
   Current:
     Federal............................................... $ 43 $  510  $1,256
     State.................................................    3     21      24
     Foreign...............................................  127    592   1,036
                                                            ---- ------  ------
                                                             173  1,123   2,316
   Deferred................................................  240    (12)   (900)
                                                            ---- ------  ------
       Total provision..................................... $413 $1,111  $1,416
                                                            ==== ======  ======
</TABLE>
 
  Deferred income tax assets (liabilities) at June 30, 1996 and 1997 consisted
of the following (in thousands):
 
<TABLE>
<CAPTION>
                                                                   JUNE 30,
                                                                ---------------
                                                                 1996     1997
                                                                -------  ------
   <S>                                                          <C>      <C>
   Expenses not currently deductible........................... $   873  $1,455
   State income taxes..........................................     --      --
   Other.......................................................     --      301
                                                                -------  ------
     Total deferred income tax assets..........................     873   1,756
                                                                -------  ------
   Depreciation................................................    (145)    (43)
   Capitalized software development costs......................    (214)   (219)
   State income taxes..........................................    (173)   (329)
   Revitalization zone deductions..............................    (278)   (392)
   Other.......................................................    (190)    --
                                                                -------  ------
     Total deferred income tax liabilities.....................  (1,000)   (983)
                                                                -------  ------
   Net deferred income taxes................................... $  (127) $  773
                                                                =======  ======
</TABLE>
 
                                     F-15
<PAGE>
 
                      OSI SYSTEMS, INC. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
  The consolidated effective income tax rate differs from the federal
statutory income tax rate due primarily to the following:
 
<TABLE>
<CAPTION>
                                                             YEAR ENDED
                                                              JUNE 30,
                                                           ------------------
                                                           1995   1996   1997
                                                           ----   ----   ----
   <S>                                                     <C>    <C>    <C>
   Provision for income taxes at federal statutory rate... 35.0 % 35.0 % 35.0 %
   State income taxes (credits), net of federal benefit... (2.6)   0.2   (4.7)
   Nontaxable earnings of FSC............................. (7.1)  (5.7)  (4.9)
   Research and development tax credits................... (2.8)   --    (1.7)
   Foreign income subject to tax at other than federal
    statutory rate........................................  0.7    1.1   (1.0)
   Other..................................................  3.4    3.6    2.6
                                                           ----   ----   ----
   Effective income tax rate.............................. 26.6 % 34.2 % 25.3 %
                                                           ====   ====   ====
</TABLE>
 
  The Company does not provide for U.S. income taxes on the undistributed
earnings of the foreign subsidiaries as it is the Company's intention to
utilize those earnings in the foreign operations for an indefinite period of
time. At June 30, 1997 undistributed earnings of the foreign subsidiaries
amounted to approximately $3,656,000. It is not practicable to determine the
amount of income or withholding tax that would be payable upon the remittance
of those earnings.
 
8. COMMITMENTS AND CONTINGENCIES
 
  The Company leases its production and office facilities and certain
equipment under various operating leases. Most of these leases provide for
increases in rents based on the Consumer Price Index and include renewal
options ranging from two to ten years. The lease for the production and office
facilities in Hawthorne, California expires in 2005, and the Company is
currently considering exercising its option to purchase the facilities for
approximately $3,000,000. Future minimum lease payments under such leases as
of June 30, 1997 are as follows: $280,000; 1998, $1,046,000; 1999, $826,000;
2000, $684,000; 2001, $658,000; 2002, $401,000; and thereafter, $2,561,000.
Total rent expense included in the accompanying consolidated financial
statements was $959,000, $901,000 and $921,000 for the years ended June 30,
1995, 1996 and 1997, respectively.
 
  The Company is involved in various claims and legal proceedings arising out
of the conduct of its business, principally related to patent rights and
related licensing issues. The principal litigation involves claims that
certain technology used in the Company's scanners infringes on certain
existing patents and seeks damages in an unspecified amount and an injunction
barring the Company from making, using, selling or offering for sale certain
of its security and inspection products in the United States. The Company has
alleged that its security products do not infringe the patents, and that the
plaintiffs in the suit had previously granted the Company the right to market
its security and inspection products. In the event it is determined that the
Company's products infringe upon the rights of the plaintiffs and that the
Company does not have the right to use the technology in its products, the
Company could be prevented from marketing most of its security and inspection
products in the United States and could be required to pay a significant
amount of damages.
 
  An estimate of loss or range of loss cannot be made at this time, however,
management of the Company believes that the resolution of the above noted
litigation and other legal proceedings will not have a material adverse effect
on the Company's consolidated financial statements.
 
                                     F-16
<PAGE>
 
                      OSI SYSTEMS, INC. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
9. STOCK OPTIONS
 
  The Company has two stock option plans. Under the 1987 plan, 1,050,000
shares of common stock have been reserved for the issuance of incentive stock
options to key employees, directors and officers of the Company. The price,
terms and conditions of each issuance are determined by the Board of
Directors.
 
  The 1997 plan was established in May 1997 and authorizes the grant of up to
850,000 shares of the Company's common stock in the form of incentive and
nonqualified options. Employees, officers and directors are eligible under
this plan, which is administered by the Board of Directors who determine the
terms and conditions of each grant. The exercise price of nonqualified options
may not be less than 85% of the fair market value of the Company's common
stock at the date of grant. The exercise price of incentive stock options may
not be less than the fair market value of the Company's common stock at the
date of grant. The exercise price of incentive stock options granted to
individuals that own greater than ten percent of the Company's voting stock
may not be less than 110% of the fair market value of the Company's common
stock at the date of grant.
 
  Exercise periods for incentive and nonqualified options granted under this
plan may not exceed ten years from the grant date.
 
  In November and December 1996, the Company granted stock options for the
purchase of 235,125 shares of the Company's common stock to certain employees
at prices below the $6.67 estimated fair market value at the date grant. The
options were accelerated to vest immediately and accordingly, the Company has
recorded compensation expense for the year ended June 30, 1997, representing
the excess of the fair value of the Company's common stock at the date of
grant over the option exercise price.
 
                                     F-17
<PAGE>
 
                      OSI SYSTEMS, INC. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
  The following summarizes stock option activity for the years ended June 30,
1995, 1996 and 1997:
 
<TABLE>
<CAPTION>
                                                               OPTION PRICE
                                                   NUMBER   -------------------
                                                     OF     WEIGHTED
                                                  OPTIONS   AVERAGE    TOTAL
                                                  --------  -------- ----------
   <S>                                            <C>       <C>      <C>
   Outstanding, July 1, 1994.....................  307,875   $1.43   $  440,000
   Granted.......................................   69,000    2.00      138,000
   Exercised.....................................  (60,000)   1.25      (75,000)
   Canceled......................................  (19,500)   1.77      (34,000)
                                                  --------           ----------
   Outstanding, June 30, 1995....................  297,375    1.57      469,000
   Granted.......................................   51,000    2.17      111,000
   Exercised.....................................  (16,125)   1.06      (17,000)
   Canceled......................................  (13,500)   1.60      (22,000)
                                                  --------           ----------
   Outstanding, June 30, 1996....................  318,750    1.70      541,000
   Granted.......................................  669,611    8.88    5,947,000
   Exercised..................................... (118,125)   1.24     (146,000)
   Canceled......................................   (9,750)   2.38      (23,000)
                                                  --------           ----------
   Outstanding, June 30, 1997....................  860,486   $7.34   $6,319,000
                                                  ========           ==========
</TABLE>
 
  The following summarizes pricing and term information for options
outstanding as of June 30, 1997:
 
<TABLE>
<CAPTION>
                                   OPTIONS OUTSTANDING              OPTIONS EXERCISABLE
                         ---------------------------------------- -----------------------
                                                         WEIGHTED                WEIGHTED
                             NUMBER     WEIGHTED AVERAGE AVERAGE                 AVERAGE
  RANGE OF               OUTSTANDING AT    REMAINING     EXERCISE EXERCISABLE AT EXERCISE
EXERCISE PRICES          JUNE 30, 1997  CONTRACTUAL LIFE  PRICE   JUNE 30, 1997   PRICE
- ---------------          -------------- ---------------- -------- -------------- --------
<S>                      <C>            <C>              <C>      <C>            <C>
$0.17 to $0.67..........     13,500        1.0 years      $0.64       13,500      $0.64
 1.87 to  2.00..........    134,625        2.0             1.95      102,563       1.93
 2.33 to  3.33..........    277,875        4.1             2.89      269,250       2.90
11.50 to  13.50.........    434,486        5.0            12.08          --         --
                            -------                                  -------
$0.17 to $13.50.........    860,486        4.2            $7.34      385,313      $2.56
                            =======                                  =======
</TABLE>
 
  The Company has adopted the disclosure-only provisions of SFAS 123,
"Accounting for Stock-Based Compensation." The estimated fair value of options
granted during 1996 and 1997 pursuant to SFAS 123 was approximately $19,000
and $1,054,000, respectively. Had the Company adopted SFAS 123, pro forma net
income would have been $2,297,000 and $4,058,000, and pro forma net income per
share would have been $0.36 and $0.64 for 1996 and 1997, respectively. The
fair value of each option grant was estimated using the Black-Scholes option-
pricing model with the following weighted average assumptions: dividend yield
and volatility of zero, a risk free interest rate of 6.33% and expected option
lives of 5 years.
 
10. STOCKHOLDERS' EQUITY
 
  In May 1997, the Company's Board of Directors authorized a 1.5 for 1 stock
split of the outstanding common stock. All share and per share numbers have
been adjusted to retroactively reflect the common stock split.
 
                                     F-18
<PAGE>
 
                      OSI SYSTEMS, INC. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
  The preferred stock had a liquidation preference of $1.00 per share, and was
otherwise entitled to the same voting, dividend and all other rights as the
common stock.
 
  In June 1997, in order to simplify the capital structure of the Company,
holders of the preferred stock converted each preferred share into 1.5 shares
(post-split) of common stock.
 
  In June 1997, the Company amended its articles of incorporation, which
articles authorize 10,000,000 shares of new preferred stock. Such preferred
stock has no par value, and no preferred shares are issued and outstanding at
June 30, 1997.
 
  In connection with the acquisition of the minority interest of a subsidiary
in November 1996 (see Note 1), the Company granted the selling shareholders
options to purchase 45,486 shares of the Company's common stock at $11.50 per
share. The options vest over four years from the date of grant. If the Company
does not successfully complete an underwritten public offering of its common
stock by December 31, 1997, the options revert back to the Company.
 
11. RELATED PARTY TRANSACTIONS
 
  The Company contracts with entities affiliated by common ownership to
provide messenger service and auto rental and printing services. The Company
also contracts for professional services from a firm that has a partner
serving as a member of the Company's Board of Directors. Included in selling,
general and administrative expenses for the years ended June 30, 1995, 1996
and 1997 are approximately $77,000, $83,000, and $111,000 for messenger
service and auto rental; $78,000, $63,000, and $82,000 for printing services;
and $23,000, $7,000, and $11,000 for professional services, respectively.
During the year ended June 30, 1997, the Company paid a one time consulting
fee amounting to $100,000 to an entity that is a shareholder of the Company.
 
  Shareholders and other parties related to the Company have made loans to the
Company under agreements subordinating such loans to the Company's bank
borrowings (see Notes 4, 5 and 6). Interest expense related to such borrowings
was approximately $315,000, $263,000, and $146,000 for the years ended June
30, 1995, 1996 and 1997, respectively.
 
12. GOVERNMENT SETTLEMENT
 
  During 1994, a subsidiary of the Company was notified that the U.S.
Department of Justice was conducting an investigation regarding the testing of
certain products that were sold by a subsidiary under government contracts. A
settlement of $1,500,000 was agreed to, and was accrued and charged to
operations in the year ended June 30, 1994. The settlement is being paid in
five increasing installments, with the unpaid principal balance bearing
interest at the 52-week Treasury bill rate. At June 30, 1997, the unpaid
balance of this settlement was $700,000 (see Note 6).
 
13. EMPLOYEE BENEFIT PLANS
 
  OSI Systems, Inc. has a qualified employee retirement savings plan. The plan
provides for a contribution by the Company, which is determined annually by
the Board of Directors. In addition, the plan permits voluntary salary
reduction contributions by employees. The Company made no contributions to the
plan for the years ended June 30, 1997, 1996 and 1995. During 1995, a
subsidiary in the U.K. ("Rapiscan") transferred its existing employees from
their former owner's plan to a new plan, the Rapiscan defined benefit plan,
which covers certain Rapiscan employees. The benefits under this plan are
based on years of service and the employee's highest 12 months' compensation
during the last five years of employment. Rapiscan's funding policy is to make
the minimum annual contributions required by applicable regulations based on
an independent actuarial valuation sufficient to provide for benefits accruing
after that date. Pension expense for the years ended June 30, 1995, 1996 and
1997 was approximately $111,000, $91,000, and $89,000, respectively.
 
                                     F-19
<PAGE>
 
                      OSI SYSTEMS, INC. AND SUBSIDIARIES
 
            NOTES TO CONSOLIDATED FINANCIAL STATEMENTS--(CONTINUED)
 
14. SEGMENT INFORMATION
 
  The Company's operating locations include the United States, Europe (United
Kingdom and Norway) and Asia (Singapore and Malaysia). The Company's
operations and identifiable assets by geographical area are as follows (in
thousands):
 
<TABLE>
<CAPTION>
                                           YEAR ENDED JUNE 30, 1995
                               -------------------------------------------------
                               UNITED
                               STATES  EUROPE   ASIA   ELIMINATIONS CONSOLIDATED
                               ------- ------- ------- ------------ ------------
<S>                            <C>     <C>     <C>     <C>          <C>
Revenues.....................  $33,158 $11,341 $ 5,316                $49,815
Transfer between geographical
 areas.......................    1,698     788   3,831   $ (6,317)        --
                               ------- ------- -------   --------     -------
Net revenues.................  $34,856 $12,129 $ 9,147   $ (6,317)    $49,815
                               ======= ======= =======   ========     =======
Operating income.............  $ 1,996 $   485 $   267   $     57     $ 2,805
                               ======= ======= =======   ========     =======
Identifiable assets..........  $36,751 $10,832 $ 4,839   $(21,642)    $30,780
                               ======= ======= =======   ========     =======
<CAPTION>
                                           YEAR ENDED JUNE 30, 1996
                               -------------------------------------------------
                               UNITED
                               STATES  EUROPE   ASIA   ELIMINATIONS CONSOLIDATED
                               ------- ------- ------- ------------ ------------
<S>                            <C>     <C>     <C>     <C>          <C>
Revenues.....................  $42,403 $15,346 $ 3,769                $61,518
Transfer between geographical
 areas.......................    6,304   3,092  10,974   $(20,370)        --
                               ------- ------- -------   --------     -------
Net revenues.................  $48,707 $18,438 $14,743   $(20,370)    $61,518
                               ======= ======= =======   ========     =======
Operating income.............  $ 2,641 $ 1,278 $   890   $   (197)    $ 4,612
                               ======= ======= =======   ========     =======
Identifiable assets..........  $42,932 $10,179 $ 5,986   $(23,788)    $35,309
                               ======= ======= =======   ========     =======
<CAPTION>
                                           YEAR ENDED JUNE 30, 1997
                               -------------------------------------------------
                               UNITED
                               STATES  EUROPE   ASIA   ELIMINATIONS CONSOLIDATED
                               ------- ------- ------- ------------ ------------
<S>                            <C>     <C>     <C>     <C>          <C>
Revenues.....................  $54,310 $18,915 $ 4,403                $77,628
Transfer between geographical
 areas.......................    8,655   5,156  12,191   $(26,002)        --
                               ------- ------- -------   --------     -------
Net revenues.................  $62,965 $24,071 $16,594   $(26,002)    $77,628
                               ======= ======= =======   ========     =======
Operating income.............  $ 3,814 $ 1,849 $ 1,390   $   (263)    $ 6,790
                               ======= ======= =======   ========     =======
Identifiable assets..........  $52,367 $15,066 $ 8,395   $(28,495)    $47,333
                               ======= ======= =======   ========     =======
</TABLE>
 
                                     F-20
<PAGE>
 
                              [INSIDE BACK PAGE]

    
[Background names of various countries]      
    
[Picture of inspection machine with image of gun and various 
items on monitor]      
                                       
                                   RAPISCAN 
                         2000 Units Shipped Worldwide      
    
[Picture of cruise ship terminal]
Cruise Ship Terminal      
    
[Picture of correctional facility]
Correctional Facility      
    
[Picture of freight forwarder facility]
International Freight Forwarder      
    
[Picture of court house]
Municipal Court House      
    
[Picture of Buckingham Palace]
Buckingham Palace      
    
[Picture of airport terminal]
International Airport      

<PAGE>
 
 
 
                                      
                         [LOGO OF OPTO-SENSORS, INC.]
 
 
 


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