IGEN INTERNATIONAL INC /DE
424B3, 1998-04-15
PATENT OWNERS & LESSORS
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                                                            FILED PURSUANT TO
    
 
   
                                                              RULE 424(B)(3)
    
 
   
                                                                REGISTRATION NO.
                                                                       333-45355
    
 
PROSPECTUS
 
                            IGEN INTERNATIONAL, INC.
 
                        5,202,004 SHARES OF COMMON STOCK
 
                               ------------------
 
   
    This Prospectus relates to the offering by the Selling Securityholders named
herein (the "Selling Securityholders") of up to an aggregate of 5,202,004 shares
of common stock, $.001 par value per share (the "Shares" or "Common Stock") of
IGEN International, Inc. ("IGEN" or the "Company") issuable upon conversion of
the Series B Convertible Preferred Stock of the Company. Of the 5,202,004
shares, 1,790,829 shares are issuable to the Selling Securityholders upon
conversion of the 25,000 shares of Series B Convertible Preferred Stock ("Series
B Preferred Stock") issued by the Company to the Selling Securityholders. Up to
810,174 shares are issuable to the Selling Securityholders, at the option of the
Company, as payment of the dividends due on the Series B Preferred Stock. The
Prospectus also covers pursuant to Rule 416 under the Securities Act of 1993, as
amended, such indeterminate number of Shares as may be required to effect
conversion of the Series B Convertible Preferred Stock to prevent dilution
resulting from stock splits, stock dividends or similar transactions. The Shares
may be sold from time to time by the Selling Securityholders, or by pledgees or
transferees of, or certain successors in interest to Selling Securityholders, in
privately negotiated transactions, in brokers' transactions, to market makers or
in block placements, at market prices prevailing at the time of sale or at
prices otherwise negotiated. See "Selling Securityholders" and "Plan of
Distribution."
    
 
    The Company will not receive any of the proceeds from the sale of the shares
being sold by the Selling Securityholders. The Company has agreed to bear the
expenses incurred in connection with the registration of the Shares, other than
underwriting discounts and commissions, fees and expenses of counsel to each
Selling Securityholder.
 
    The Company's Common Stock is traded on the Nasdaq National Market (the
"NNM") under the symbol "IGEN." On January 23, 1998, the last reported sale
price of the Common Stock was $16.625 per share, as reported by the NNM.
 
                            ------------------------
 
THE SECURITIES TO BE SOLD PURSUANT TO THIS PROSPECTUS HAVE NOT BEEN APPROVED OR
 DISAPPROVED BY THE SECURITIES AND EXCHANGE COMMISSION NOR HAS THE COMMISSION
         PASSED UPON THE ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY
             REPRESENTATION TO THE CONTRARY IS A CRIMINAL OFFENSE.
 
                            ------------------------
 
            SEE "RISK FACTORS," BEGINNING ON PAGE 4, FOR INFORMATION
       THAT SHOULD BE CONSIDERED REGARDING THE SECURITIES OFFERED HEREBY.
 
                            ------------------------
 
   
                 The date of this Prospectus is April 15, 1998.
    
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                             AVAILABLE INFORMATION
 
    The Company is subject to the informational reporting requirements of the
Securities Exchange Act of 1934, as amended (the "Exchange Act"), and in
accordance therewith files reports, proxy statements and other information with
the Securities and Exchange Commission (the "Commission"). Such reports, proxy
statements and other information can be inspected and copied at the public
reference facilities maintained by the Commission at Room 1024, 450 Fifth
Street, N.W., Judiciary Plaza, Washington, D.C. 20549, and at the following
Regional Offices of the Commission: Chicago Regional Office, Citicorp Center,
500 West Madison Street, Suite 1400, Chicago, Illinois 60661-2511; and New York
Regional Office, 7 World Trade Center, Suite 1300, New York, New York 10048.
Copies of such material can be obtained at prescribed rates from the Public
Reference Section of the Commission at 450 Fifth Street, N.W. Judiciary Plaza,
Washington, D.C. 20549. Such reports and other information can also be reviewed
through the Commission's Electronic Data Gathering, Analysis and Retrieval
System ("EDGAR") which is publicly available through the Commission's Web site
(http://www.sec.gov). In addition, the Company's Common Stock is listed on the
Nasdaq Stock Market's National Market System, and material filed by the Company
can be inspected at the offices of the National Association of Securities
Dealers, Inc., 1735 K Street, N.W., Washington, D.C. 20006.
 
    Additional information regarding the Company and the shares offered hereby
is contained in the Registration Statement on Form S-3 and the exhibits thereto
filed with the Commission under the Securities Act of 1933, as amended (the
"Securities Act"). As permitted by the rules and regulations of the Commission,
this Prospectus does not contain all of the information contained in such
Registration Statement and the exhibits and schedules thereto. Statements
contained in the Prospectus regarding the contents of any document or contract
may be incomplete and, in each instance, reference is made to the copy of such
contract or document filed as an exhibit to the Registration Statement. For
further information pertaining to the Company and the shares, reference is made
to the Registration Statement and the exhibits thereto, which may be inspected
without charge at the offices of the Commission or on EDGAR, and copies thereof
may be obtained at prescribed rates from the Public Reference Section of the
Commission at the address set forth above.
 
                INCORPORATION OF CERTAIN DOCUMENTS BY REFERENCE
 
   
    The following documents filed by the Company with the Commission pursuant to
the Exchange Act are incorporated by reference in and made a part of this
Prospectus: (1) the Annual Report on Form 10-K for the fiscal year ended March
31, 1997, filed July 11, 1997; (2) the Amendment to the Annual Report on Form
10-K/A for the fiscal year ended March 31, 1997, filed July 29, 1997; (3) the
Quarterly Reports on Form 10-Q for the quarterly periods ended: (i) December 31,
1996, filed February 4, 1997, (ii) June 30, 1997, filed August 14, 1997, (iii)
September 30, 1997, filed November 14, 1997, and (iv) December 31, 1997, filed
February 13, 1998; (4) the Amendments to the Quarterly Reports on Form 10-Q/A
for the quarterly periods ended: (i) June 30, 1997, filed April 13, 1998, (ii)
September 30, 1997, filed April 13, 1998, and (iii) December 31, 1997, filed
April 13, 1998; (5) the description of the Company's Common Stock set forth in
the Company's Registration Statement on Form 8-A filed with the Commission on
January 20, 1994; (6) Current Report on Form 8-K, filed December 19, 1997 and
(7) Form 12b-25, filed July 1, 1997.
    
 
    All documents filed by the Company pursuant to Section 13(a), 13(c), 14 or
15(d) of the Exchange Act after the date of this Prospectus and prior to the
termination of the offering shall be deemed to be incorporated by reference
herein and to be a part of this Prospectus from the date of filing of such
documents. Any statement contained in a document incorporated or deemed to be
incorporated by reference herein shall be deemed to be modified or superseded
for purposes of this Prospectus to the extent that a statement contained herein
or in any other subsequently filed document which also is or is deemed to be
incorporated by reference herein modifies or supersedes such statement. Any such
statement so modified or superseded shall not be deemed, except as so modified
or superseded, to constitute a part of this Prospectus.
 
    Copies of all documents which are incorporated herein by reference (not
including the exhibits to such documents, unless such exhibits are specifically
incorporated by reference into such documents or into this Prospectus) will be
provided without charge to each person, including any beneficial owner, to whom
this Prospectus is delivered, upon a written or oral request to IGEN
International, Inc., Attention: George V. Migausky, Chief Financial Officer,
16020 Industrial Drive, Gaithersburg, MD 20877, telephone number (301) 984-8000.
 
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                                  RISK FACTORS
 
    In evaluating an investment in the Common Stock, prospective purchasers
should carefully consider the following factors as well as the other matters
discussed in this Prospectus and the documents incorporated herein by reference.
 
RELIANCE ON COLLABORATIONS AND LICENSE AGREEMENTS
 
   
    The Company has entered into collaborative research or licensing agreements
with Boehringer Mannheim, Organon Teknika and Eisai pursuant to which these
companies are entitled to certain product manufacturing and marketing rights.
Some of these companies have the responsibility for additional development and,
where required, the submission of applications for the regulatory approval of
any products to the U.S. Food and Drug Administration ("FDA") and corresponding
regulatory agencies in other countries. Although the Company believes that its
partners in these collaborations have an economic motivation to succeed in
performing their contractual responsibilities, the amount and timing of
resources to be devoted to these activities are not within the control of the
Company. There can be no assurance that such collaborators will perform their
obligations as expected or that the Company will derive any additional revenue
from such arrangements. The Company is currently involved in litigation against
Boehringer Mannheim. Moreover, the collaboration agreements may be terminated
under certain circumstances. See "Recent Developments."
    
 
    The Company also expects to rely on additional collaboration or license
agreements to develop and commercialize certain future products. There can be no
assurance that the Company will be able to negotiate acceptable collaboration or
license agreements in the future, or that such new agreements or existing
agreements will be successful. In addition, there can be no assurance that the
parties to collaboration or license agreements will not pursue alternative
technologies as a means for developing diagnostic products targeted by the
collaborations or licenses.
 
   
PENDING LITIGATION
    
 
   
    The Company is currently involved in litigation in Maryland federal court
against Boehringer Mannheim GmbH ("BMG") in connection with a 1992 License and
Technology Development Agreement ("Agreement") between the parties. The
Agreement grants BMG an exclusive right (with the exception of certain exclusive
rights in Japan granted to Eisai Co. Ltd. to manufacture, market, and sell
electrochemiluminesence-based instruments, and related assays, meeting certain
criteria for the Japanese clinical diagnostic market) to market its diagnostic
Elecsys systems, which are centered on the Company's ORIGEN technology, to
hospitals and clinical reference laboratories. In exchange for those exclusive
rights, the Agreement places various obligations on BMG, including the
obligation to make quarterly royalty payments to the Company. The Company
alleges that BMG has failed to perform material obligations under the Agreement,
including development and commercialization of ORIGEN technology according to
the contractual timetable; exploitation of the License to the extent
contemplated by the parties; phase out of certain non-royalty-bearing product
lines; exploitation of ORIGEN technology only within BMG's licensed fields;
proper treatment of intellectual property rights regarding ORIGEN technology;
maintenance of records essential to the complete computation of royalties; and
proper computation of royalties. The Company seeks several types of relief,
including damages and a judicial determination that the Company is entitled to
terminate the Agreement based on BMG's material breaches. BMG also has filed a
lawsuit against the Company in Indiana, seeking a determination that it has not
breached Agreement and that the Company is not entitled to terminate. The
Maryland court has determined that these issues will be resolved in the
Company's Maryland action. BMG has agreed to dismiss the Indiana lawsuit. The
Company has agreed that it will not terminate the Agreement until there is a
judicial determination of the Company's entitlement to do so. The litigation
against BMG may have a material adverse effect upon the Company, as discussed
below, regardless of whether the outcome is favorable or not.
    
 
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    A Japanese subsidiary of the Company is involved in litigation in Japan
seeking to enjoin Hitachi Ltd. ("Hitachi"), BMG's contracted manufacturer of
certain diagnostic instruments, from manufacturing, using or selling the Elecsys
2010 immunoassay instrument based on the Company's Japanese patented technology,
to enjoin the infringement of the subsidiary's license registration in
connection with the development of the Mosys instrument, a next generation
instrument also based on the Company's Japanese patented technology, and the
destruction of the existing Elecsys and Mosys instruments in Hitachi's
possession. See--"Recent Developments."
    
 
   
    The Company is vigorously litigating the BMG and Hitachi matters and
believes that its lawsuits are sound. However, there can be no assurance that
either litigation will be resolved favorably to the Company. The Company's
failure to prevail in the BMG litigation with respect to the computation of
royalty revenues could, depending upon the court's findings, have a material
adverse effect on the Company's future royalty revenue from BMG's Elecsys
products. The Company's failure to prevail in the BMG litigation would not have
a direct material adverse effect on the Company's product development, but could
negatively impact the funds available for product development. Although the
litigation does not involve any challenges to the Company's intellectual
property rights, there can be no assurance that a negative result for the
Company in the litigation will not have a material adverse effect on the
Company's intellectual property rights.
    
 
   
    The Company has no reason to believe that the existence of the BMG
litigation is materially negatively affecting BMG's sales pursuant to the
Agreement or that a negative result for the Company in the BMG litigation would
materially negatively affect BMG's sales, although there can be no assurance
that the litigation or its outcome would not have such an effect. As it now
stands, BMG will have the right to continue to market its Elecsys products to
hospitals and clinical reference laboratories during the term of the Agreement
unless and until the Company is determined to have the right to terminate the
Agreement and then determines to terminate the Agreement. If the Company elects
to terminate the Agreement, it would have a material adverse effect on the
Company's royalty revenue from license sales unless and until the Company
entered into a strategic partnership with another company that is able to
develop and commercialize diagnostic instruments to hospitals and clinical
reference laboratories. There can be no assurance, if the Company decided to
terminate the Agreement, that the Company would be able to enter into such a
strategic partnership on terms favorable to the Company.
    
 
   
    The Company does not expect that failure to prevail in the Hitachi
litigation by itself would have a material adverse effect on the Company's
revenues or sale, since Hitachi would continue to manufacture BMG instruments
and the Company would continue to earn royalties in connection therewith. There
can be no assurance that the Company's failure in the Hitachi litigation would
not have a material adverse effect on the Company's intellectual property.
Success by the Company in the Hitachi litigation could have a material adverse
effect on the Company's royalty revenues from sales of Elecsys products to the
extent that BMG's sales of Elecsys (or Mosys) instruments are hindered because
it needs to find a new manufacturer for its instruments.
    
 
EARLY STAGE OF DEVELOPMENT; ACCUMULATED LOSSES
 
   
    The Company is at an early stage of development and is subject to all of the
risks inherent in the establishment of a new business enterprise, including the
need for substantial capital to support the expenses of developing new
technologies, the need to attract and retain qualified management and scientific
staff and other risks as outlined in the following risk factors. Since
inception, the Company has been engaged in the research and development of
products based on new technologies, and at September 30, 1997, the Company had
an accumulated deficit of approximately $63 million. The Company's operations
may be affected by problems frequently encountered in connection with the
development and utilization of new technologies and by the competitive
environment in which the Company operates. Although certain ORIGEN-based
products have been developed and introduced to the market, there can be no
assurance that the ORIGEN technology will be successfully applied to the
development of additional
    
 
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<PAGE>
commercial products for the clinical diagnostic or other markets. Diagnostic
products resulting from the development of the Company's technology will require
significant additional development and investment prior to their
commercialization. There can be no assurance that products will be successfully
developed by the Company or its licensees, meet applicable regulatory standards,
be capable of being manufactured in commercial quantities at reasonable costs or
be marketed successfully.
 
TECHNOLOGICAL CHANGE AND COMPETITION
 
    The diagnostic industry is subject to technological change. Competition from
diagnostic and pharmaceutical companies and research and academic institutions
is intense and expected to increase. There can be no assurance that the
Company's competitors will not succeed in developing products that are more
effective than any which are being developed by the Company and its
collaborators or which would render the ORIGEN technology and products obsolete
and non-competitive.
 
    Many of the Company's competitors in the diagnostic field have substantially
greater financial, technical and human resources than the Company. In addition,
many of these competitors have significantly greater experience than the Company
in obtaining regulatory approvals of new diagnostic products. Accordingly, the
Company's competitors may succeed in obtaining FDA approval for products more
rapidly than the Company. Furthermore, as the Company expands commercial sales
of products, it will have to become competitive with respect to manufacturing
efficiency and marketing capabilities, areas in which it has limited experience.
 
COMPLIANCE WITH GOVERNMENT REGULATIONS
 
    The production and marketing of the Company's products and its ongoing
research and development activities are subject to regulation by governmental
authorities in the United States and other countries. Diagnostic systems
utilizing the Company's ORIGEN technology will require government clearance
before being marketed in the United States and in certain foreign countries. In
the United States, the Company or its marketing collaborators may be required to
submit test data from clinical trials to establish "substantial equivalence" of
the ORIGEN diagnostic system with previously approved systems. In such case, the
Company or its collaborators may commence sales only after the FDA has issued a
written order finding such substantial equivalence, which may take longer than
the 90-day period generally provided for FDA review. There can be no assurance
that the Company or its collaborators will be able to establish substantial
equivalence for the ORIGEN diagnostic systems, or that the FDA or certain
corresponding government agencies will permit marketing of such systems in their
respective jurisdictions. Should the Company fail to demonstrate substantial
equivalence, the Company would need to perform extensive clinical testing to
demonstrate safety and efficacy, incurring substantial costs and delays.
 
    Even if regulatory approval is obtained, a marketed product, its
manufacturer and its manufacturing facilities are subject to continual review
and periodic inspections. The regulatory standards for manufacturing are
currently being applied stringently by the FDA. Discovery of previously unknown
problems with a product, manufacturer or facility may result in restrictions on
such product or manufacturer, including costly recalls or even withdrawal of the
product from the market. The Company is also subject to numerous environmental
and safety laws and regulations, including those governing use of hazardous
materials. Any violation of, and the cost of compliance with, these regulations
could adversely impact the Company's operations.
 
RELIANCE ON PATENTS AND PROPRIETARY RIGHTS
 
    The Company's success will depend in part on its ability to obtain and
maintain patent protection for its products, both in the United States and other
countries. The patent position of diagnostic companies is highly uncertain and
involves complex legal and factual questions. There is no consistent policy
regarding the breadth of claims allowed in medical patents. The Company owns or
co-owns and has been granted
 
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exclusive rights to 18 issued U.S. patents and 69 pending U.S. applications in
the diagnostics field. Worldwide, the Company owns or co-owns and has been
granted exclusive rights to an additional 54 issued patents, and 150 pending
patent applications covering the same technology. There can be no assurance that
patents will issue from any present or future applications or that, as to
existing patents or patents which may issue, claims are or will be sufficiently
broad to protect the Company's technology. In addition, there can be no
assurance that the patents issued to the Company will not be challenged,
invalidated or circumvented, or that the rights granted thereunder will provide
proprietary protection to the Company.
 
    The commercial success of the Company will also depend in part on its
neither infringing patents issued to competitors nor breaching the technology
licenses upon which the Company's products might be based. The Company is a
licensee under certain patents and patent applications that it considers
necessary for its business. While the Company is aware of additional third-party
patents and patent applications relating to specific reagents, it is uncertain
whether any of these will require the Company to alter any products or
processes, obtain licenses or cease certain development activities with respect
to these reagents. There can be no assurance that the Company will be able to
obtain necessary licenses at reasonable cost. Failure by the Company to obtain a
license to any technology that it requires to commercialize its products may
have a material adverse impact on the Company. Litigation, which could result in
substantial costs to the Company, may also be necessary to enforce any of its
patent rights or to determine the scope and validity of others' proprietary
rights. In addition, the Company may have to participate in interference
proceedings declared by the U.S. Patent and Trademark Office, which could result
in substantial costs to the Company to determine the priority of inventions.
 
    IGEN also protects its proprietary technology and processes in part by
confidentiality agreements with its collaborative partners, employees,
consultants and other advisors. There can be no assurance that these agreements
will not be breached, that the Company will have adequate remedies for any
breach or that the Company's trade secrets will not otherwise become known or be
independently discovered by competitors.
 
UNCERTAINTY OF PRICING, THIRD-PARTY REIMBURSEMENT AND RELATED MATTERS
 
    The Company's business, financial condition and results of operations may be
materially adversely affected by the continuing efforts of government and third
party payors to contain or reduce the costs of health care through various
means. For example, in certain foreign markets pricing and profitability of
diagnostic products are subject to government control. In the United States, the
Company expects that there will continue to be a number of federal and state
proposals to implement similar government control. In addition, increasing
emphasis on managed care in the United States will continue to put pressure on
the pricing of diagnostic tests. Cost control initiatives could decrease the
price that the Company or any of its strategic partners receives for any
products in the future and have a material adverse effect on the Company's
business, financial condition and results of operations. Further, to the extent
that cost control initiatives have a material adverse effect on the Company's
strategic partners, the Company's ability to commercialize its products and to
realize royalties may be adversely affected.
 
    The ability of the Company and any strategic partner to commercialize
diagnostic products may depend in part on the extent to which reimbursement for
the products will be available from government and health administration
authorities, private health insurers and other third party payors. Significant
uncertainty exists as to the reimbursement status of newly approved health care
products. Third party payors, including Medicare, increasingly are challenging
the prices charged for medical products and services. Government and other third
party payors are increasingly attempting to contain health care costs by
limiting both coverage and the level of reimbursement for new products. There
can be no assurance that any third party insurance coverage will be available to
patients for any products developed by the Company or its strategic partners. If
adequate coverage and reimbursement levels are not provided by government and
other third party payors for the Company's products, the market acceptance of
these products may be
 
                                       6
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reduced, which may have a material adverse effect on the Company's business,
financial condition and results of operations.
 
LIMITED MANUFACTURING, SALES, MARKETING AND DISTRIBUTION EXPERIENCE
 
    The Company's clinical diagnostic products must be manufactured in
commercial quantities in compliance with regulatory requirements and at
acceptable costs. The Company has no experience in large scale manufacturing and
currently lacks the capability to manufacture its diagnostic products in
accordance with regulatory requirements. If the Company is unable to develop or
contract for manufacturing capabilities on acceptable terms, the Company's
ability to manufacture products will be adversely affected, resulting in the
delay of submission of products for regulatory approval, which in turn could
adversely affect the Company's competitive position and financial condition. The
Company also has limited experience in sales, marketing and distribution. To
market any of its clinical diagnostic products directly, the Company must
develop a substantial marketing and sales force with technical expertise and
supporting distribution capability. Alternatively, the Company may obtain the
assistance of established companies, as it has done with certain of its
diagnostic products. There can be no assurance that the Company will be able to
establish sales and distribution capabilities or that it or its collaborators
will be successful in gaining market acceptance for its clinical diagnostics
products.
 
FUTURE CAPITAL NEEDS; UNCERTAINTY OF ADDITIONAL FUNDING
 
   
    The Company may require substantial additional funds to conduct the research
and development and regulatory testing of its products, to establish commercial
scale manufacturing facilities and to market its products. The Company's future
capital requirements will depend on many factors, including, but not limited to:
continued progress in the development of diagnostic products; the time and costs
involved in obtaining regulatory approvals; the costs involved in filing,
prosecuting and enforcing patent claims; competing technological and market
developments; the ability of the Company to maintain its existing, and to
establish new, collaborative and licensing arrangements; the cost of
manufacturing scale-up; and effective commercialization activities and
arrangements. During the quarter ended March 31, 1997, a significant change in
revenue mix occurred compared to prior periods as the Company's license and
contract revenue converted to royalty income that is based on product sales by
corporate licensees. The Company will become more reliant on royalty income
until such time as it introduces additional product mix. Future income will
include a combination of product sales, contract research, royalties and license
fees. During the nine months ended December 31, 1997, the Company raised $25
million in a preferred stock offering as well as an additional $2.75 million in
advanced royalty payments from its Japanese corporate partner. Proceeds from the
advance royalty payment and the preferred stock offering are intended to finance
the Company's working capital needs.
    
 
    The Company may be required to seek additional funding either through
collaborative and licensing arrangements or through public or private debt or
equity financings. There can be no assurance that additional financing will be
available in a timely manner or on acceptable terms. If additional funds are
raised by issuing equity securities, further dilution to existing shareholders
may result. If adequate funds are not available, the Company may be required to
delay, scale back or eliminate one or more of its programs or obtain funds
through arrangements with collaborative partners or others that may require the
Company to relinquish rights to certain of its technologies, product candidates
or products that the Company would not otherwise relinquish.
 
NEED TO ATTRACT AND RETAIN KEY EMPLOYEES AND CONSULTANTS
 
    The Company is highly dependent on the principal members of its scientific
and management staff, the loss of whose services might impede the achievement of
its research and development or strategic objectives. Recruiting and retaining
qualified scientific personnel to perform research and development
 
                                       7
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work in the future will also be critical to the Company's success. There can be
no assurance that the Company will be able to attract and retain such personnel
given the competition between numerous diagnostic and biotechnology companies
and research and academic institutions for experienced scientists.
 
    The Company's anticipated growth and expansion into areas and activities
requiring additional expertise, such as clinical trials, government approvals,
manufacturing and marketing, are expected to place increased demands on the
Company's resources. These demands are expected to require the addition of new
management personnel and the development of additional expertise by existing
management personnel. The failure to acquire needed personnel or to develop
needed expertise could have a material adverse effect on the Company's prospects
for success. In addition, the Company relies on consultants and advisors to
assist in formulating its research and development strategy. All of the
Company's consultants and advisors are employed by entities other than the
Company and may have commitments to or consulting or advisory contracts with
other entities that may affect their ability to contribute to the Company.
 
   
YEAR 2000 POTENTIAL ISSUES
    
 
   
    Many of the world's computer systems currently record years in a two-digit
format. Such computer systems will be unable to interpret properly dates beyond
the year 1999 which could lead to business disruptions in the U.S. and
internationally ("Year 2000" issues).
    
 
   
    The Company has reviewed its business for Year 2000 issues regarding its
business, financial and accounting systems. The Company believes that
installation of new or upgraded software to address any Year 2000 issues could
be done timely and should not cause any material disruption to its business. The
Company is currently in the process of assessing whether its suppliers and
collaborators have any Year 2000 issues. There can be no assurance that the
Company's suppliers and collaborators are or will be timely Year 2000 compliant
or that a failure of such timely Year 2000 compliance would not have a material
adverse effect on the Company.
    
 
   
    The total cost to the Company of these Year 2000 compliance activities has
not been, and is not anticipated to be, material to its financial position or
results of operations in any given year. These costs and the time at which the
Company plans to complete any Year 2000 modifications are based on management's
best estimates, which were derived utilizing numerous assumptions of future
events including the continued availability of certain resources, third party
modification plans and other factors. There can be no assurance that these
estimates will be achieved and actual results could differ from those plans.
    
 
RISK OF PRODUCT LIABILITY; AVAILABILITY OF INSURANCE
 
    The Company's business will in the future expose it to potential liability
risks that are inherent in the testing, manufacturing and marketing of
diagnostic products. The Company presently has only limited product liability
insurance, and there can be no assurance that it will be able to maintain such
insurance or obtain additional insurance on acceptable terms or that insurance
will provide adequate coverage against potential liabilities.
 
ANTI-TAKEOVER PROVISIONS
 
    The Company's Certificate of Incorporation and Bylaws require that any
action required or permitted to be taken by stockholders of the Company must be
effected at a duly called annual or special meeting of stockholders and may not
be effected by written consent. Special meetings of the stockholders of the
Company may be called only by the Board of Directors, the Chairman of the Board
or the President of the Company. These and other charter provisions may
discourage certain types of transactions involving an actual or potential change
in control of the Company, including transactions in which the stockholders
might otherwise receive a premium for their shares over then current prices, and
may limit the ability of
 
                                       8
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the stockholders to approve transactions they may deem to be in their best
interests. In addition, the Board of Directors has the authority, without action
by the stockholders, to fix the rights and preferences of and to issue shares of
Preferred Stock, which also my have the effect of delaying or preventing a
change in control of the Company.
 
PRICE VOLATILITY IN PUBLIC MARKET
 
    The Company's Common Stock currently trades on the NASDAQ National Market.
The securities markets have from time-to-time experienced significant price and
volume fluctuations that may be unrelated to the operating performance of
particular companies. In addition, the market prices of the common stock of many
publicly traded technology companies have in the past been, and can in the
future be expected to be, especially volatile. Announcements of technological
innovations or new products of the Company or its competitors, developments or
disputes concerning patents or proprietary rights, publicity regarding actual or
potential medical results relating to products under development by the Company
or its competitors, regulatory developments in both the U.S. and foreign
countries, and economic and other external factors, as well as period-to-period
fluctuations in the Company's operating and product development results, may
have a significant impact on the market price of the Company's Common Stock.
 
CONTROL BY EXISTING SHAREHOLDERS
 
    The Company's directors, officers and their affiliates own beneficially
approximately 36% of the outstanding shares of Common Stock, of which
approximately 27% is held by the Company's Chief Executive Officer. Accordingly,
the Company's officers and directors, if they act in concert, will have the
ability to influence significantly the election of the Company's directors and
most other shareholder actions.
 
ABSENCE OF DIVIDENDS, DILUTION
 
    The Company has not paid any cash dividends since its inception and does not
intend to pay any cash dividends in the foreseeable future. Dilution will occur
upon the exercise of outstanding stock options of the Company and may occur upon
future equity financings of the Company.
 
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<PAGE>
                                  THE COMPANY
 
    IGEN develops, manufactures and markets diagnostic systems utilizing its
patented ORIGEN-Registered Trademark- technology, which is based on
electrochemiluminescence. This proprietary technology utilizes labels that, when
attached to a biological substance and electrochemically stimulated, emit light
at a particular wavelength to signal the presence of an analyte. The light
emission then can be measured with a high degree of accuracy to detect and
quantify the analyte. The ORIGEN technology thus provides a uniform assay format
for conducting a multitude of diagnostic tests, including immunoassays, nucleic
acid probe and clinical chemistry tests. The Company believes that ORIGEN-based
diagnostic systems offer significant advantages over existing systems in terms
of speed, sensitivity, flexibility, throughput and cost effectiveness. The
Company is designing its diagnostic systems to become the industry standard for
all segments of the diagnostic market, from large central laboratories to
patient point-of-care, industrial and in-home testing.
 
    The Company's business strategy is to commercialize certain products in
collaboration with established healthcare and information technology companies
and to develop and market other products either independently or with corporate
partners in the patient point-of-care, life science research, animal health and
industrial markets. Collaborations with established diagnostic and
pharmaceutical companies have provided the Company with revenues from licensing
agreements, as well as access to large marketing organizations that it believes
are well positioned to maximize market penetration of ORIGEN-based products. The
Company has entered into several strategic alliances, including:
 
   
    -    Boehringer Mannheim GmbH ("Boehringer Mannheim")--the second largest
         worldwide manufacturer of diagnostic equipment and supplies that is
         part of Corange Limited ("Corange"), a multinational corporation with
         annual revenues exceeding $4 billion--to commercialize ORIGEN-based
         clinical immunodiagnostic and nucleic acid probe systems that are
         marketed worldwide to clinical references laboratories. IGEN received
         $50 million in license fees from Boehringer Mannheim and receives
         royalties on all product sales. Boehringer Mannheim presently markets
         two ORIGEN-based systems under the Elecsys product line. In May 1997,
         F. Hoffman-LaRoche AG ("Roche") and Corange announced that Roche would
         acquire all shares of Corange. The merger, was completed in March 1998
         creating a $15 billion global company that is the world's largest
         diagnostic supplier. See "Risk Factors--Pending Litigation".
    
 
    -    Organon Teknika B.V. ("Organon Teknika")--a company specializing in
         hospital and blood bank products, which is a business unit of Akzo
         Nobel N.V., a multinational corporation with annual revenues of
         approximately $10 billion--to develop and commercialize ORIGEN-based
         nucleic acid probe systems that will be marketed worldwide to clinical
         diagnostic and life science research markets. The Company received $20
         million under its agreements with Organon Teknika and receives
         royalties on product sales. Organon Teknika markets the NASBA QR System
         together with test kits for the detection of HIV-1 RNA.
 
    -    Eisai Co., Ltd. ("Eisai")--the fourth largest Japanese pharmaceutical
         company--to market in Japan an ORIGEN-based diagnostic system for
         agreed-upon diagnostic tests. During 1997, Eisai began marketing an
         ORIGEN-based immunoassay system under the name Picolumi and the Company
         receives royalties on product sales.
 
    The Company currently sells the ORIGEN Detection System and related reagents
and services for life science research applications. The Company believes that
its ORIGEN Detection System can replace many of the complex and less sensitive
immunoassay methods presently in use, including radioimmunoassays. The Company
believes that applications of the ORIGEN technology include point-of-care
diagnostic systems for use outside the central laboratory because of speed,
simplicity and cost effectiveness and anticipates that applications will exist
in the field of in-home testing (patient self-testing), in which the
 
                                       10
<PAGE>
Company's technology may enable the creation of compact, inexpensive diagnostic
products. The Company is currently monitoring the development of healthcare
communication networks and intends to design its point-of-care and in-home
testing systems for integration into such networks.
 
    IGEN, Inc. was incorporated in California in 1982 and reincorporated in
Delaware during 1996 as IGEN International, Inc. IGEN's executive offices,
laboratory and manufacturing operations are located at 16020 Industrial Drive,
Gaithersburg, Maryland 20877, (301) 984-8000.
 
RECENT DEVELOPMENTS
 
    On September 15, 1997, the Company filed a lawsuit in Maryland against
Boehringer Mannheim GmbH ("BMG"), a German company to which the Company has
licensed certain rights to develop and commercialize diagnostic products based
on ORIGEN technology. That lawsuit is pending in the Southern Division of the
United States District Court for the District of Maryland. The Company's dispute
with BMG arises out of a 1992 License and Technology Development Agreement (the
"Agreement"), pursuant to which BMG developed and launched its "Elecsys" line of
diagnostic products, which is based on the Company's ORIGEN technology. The
Company alleges that BMG has failed to perform certain material obligations
under the Agreement, including development and commercialization of ORIGEN
technology according to the contractual timetable; exploitation of the license
to the extent contemplated by the parties; phase out of certain
non-royalty-bearing product lines; exploitation of ORIGEN technology only within
BMG's licensed fields; proper treatment of intellectual property rights
regarding ORIGEN technology; maintenance of records essential to the computation
of royalties; and proper computation of royalties. In its lawsuit, the Company
seeks damages as well as injunctive and declaratory relief, including a judicial
determination of its entitlement to terminate the Agreement. On September 15,
1997, shortly after the Company filed its lawsuit in Maryland, BMG filed a
lawsuit in the United States District Court for the Southern District of Indiana
seeking a declaration that it did not breach the Agreement and a preliminary
injunction precluding the Company from terminating the Agreement pending the
judicial resolution of the dispute between the parties. In addition, BMG sought
and obtained a temporary restraining order that precluded the Company from
terminating the Agreement; IGEN has agreed to the continuation of the temporary
restraining order until BMG's motion for preliminary injunction can be
adjudicated. On January 26, 1998, the United States District Court for the
District of Maryland ruled that the litigation between the Company and BMG will
go forward in Maryland. The Company expects that BMG's Indiana action will be
dismissed or consolidated with the Maryland action.
 
    In December 1997, IGEN International K.K., a Japanese subsidiary of the
Company, filed a lawsuit in Tokyo District Court against Hitachi Ltd.
("Hitachi"). This lawsuit seeks to enjoin Hitachi from manufacturing, using or
selling the Elecsys 2010 immunoassay instrument in Japan. The lawsuit also seeks
to enjoin Hitachi from infringing the subsidiary's license registration, known
in Japan as a "senyo-jisshi-ken," in connection with the development of the
Mosys instrument. Hitachi is the sole manufacturer for Boehringer Mannheim of
the Elecsys 2010 immunoassay instrument. Boehringer Mannheim sells the Elecsys
2010 worldwide to hospitals and clinical reference laboratories. Hitachi is also
developing for Boehringer Mannheim the Mosys instrument. The Company's Japanese
subsidiary alleges that both the Elecsys 2010 and the Mosys are based on ORIGEN
technology. The Company's ORIGEN technology is licensed to its Japanese
subsidiary and to Eisai K.K. pursuant to a "senyo-jisshi-ken." The Company's
Japanese subsidiary further alleges that Hitachi's manufacturing and selling of
the Elecsys 2010 and the development of Mosys violate the "senyo-jisshi-ken."
The lawsuit requests injunctive relief against Hitachi and destruction of the
Elecsys 2010 and Mosys instruments in Hitachi's possession.
 
   
    The Company entered into an agreement with Agouron Pharmaceuticals in
October 1997 pursuant to which the Company is providing certain high throughput
products and screening services. This agreement represents a high throughput
screening contract for the Company and represents an expansion of the contract
services offered to the biotechnology and pharmaceutical industries in the area
of drug discovery and development.
    
 
                                       11
<PAGE>
   
    The Company entered into an agreement with Pfizer, Inc. in March 1998
pursuant to which Pfizer will acquire the Company's first ORIGEN-based high
throughput screening system built around the Company's ECLM Modules (ECLM).
Pfizer is the first customer for the Company's new ECLM-based products which are
expected to be marketed for use in the life science research market.
    
 
                                USE OF PROCEEDS
 
    The Company will not receive any of the proceeds from the sale of the Shares
by the Selling Securityholders.
 
                            SELLING SECURITYHOLDERS
 
    The Selling Securityholders collectively purchased 25,000 shares of Series B
Convertible Preferred Stock, stated value $1,000 per share, from the Company on
December 19, 1997. The Series B Convertible Preferred Stock entitles its holders
to a dividend payment of 7.75% compounded annually on the stated value of the
stock. Based on the stated value, the Series B Convertible Preferred Stock is
convertible into Common Stock of the Company in accordance with the terms of the
Certificate of Designation, Powers, Preferences and Rights at a rate of $13.96
per Share, for a total of 1,790,830 Shares. In addition, the Company may elect
to make the dividends payable upon the Series B Convertible Preferred Stock in
Shares at a rate of $13.96 per Share, rather than making the dividend payment in
cash. If the Company elects to pay such dividends in Shares, the Company may
issue up to 810,172 Shares to the Selling Securityholders. The Prospectus also
covers, pursuant to Rule 416 under the Securities Act, such indeterminate number
of Shares as may be required to prevent dilution resulting from stock splits,
stock dividends or similar transactions.
 
   
    The following table sets forth certain information regarding ownership of
Shares by the Selling Securityholders as of December 31, 1997 and the number of
Shares which may be offered for the accounts of the Selling Securityholders or
their transferees or distributees from time to time. Because the Selling
Securityholders may sell all or any part of their shares registered pursuant to
this Prospectus, no estimate can be given as to the number of share that will be
held by the Selling Securityholders upon termination of this Offering. None of
the Selling Securityholders has, or within the past three years, has had, any
position, office or other material relationship with the Company or any of its
predecessors or affiliates except as set forth below.
    
 
                                       12
<PAGE>
 
   
<TABLE>
<CAPTION>
                                                NUMBER OF
                                                 SHARES     NUMBER OF SHARES   NUMBER OF SHARES      PERCENTAGE OF
                                                  OWNED     WHICH MAY BE SOLD     OWNED AFTER     SHARES OWNED AFTER
                                                PRIOR TO         IN THIS          COMPLETION         COMPLETION OF
SELLING STOCKHOLDER                            OFFERING(1)     OFFERING(2)      OF OFFERING(3)        OFFERING(4)
- ---------------------------------------------  -----------  -----------------  -----------------  -------------------
<S>                                            <C>          <C>                <C>                <C>
The Robertson Stephens Black Bear Fund, I,
  L.P........................................     330,186         235,443              94,743                 *
The Robertson Stephens Black Bear Fund, II,
  L.P........................................      43,356          30,900              12,456                 *
The Robertson Stephens Black Bear Offshore
  Fund, L.P..................................      84,384          63,984              20,400                 *
The Robertson Stephens Black Bear Pacific
  Master Fund Unit Trust.....................      43,613          33,813               9,800                 *
Credit Suisse First Boston Corporation.......     307,402         208,080              99,322                 *
Permal Noscal, Ltd...........................     312,121         312,121                   0                 *
Zaxis Partners, L.P..........................      39,015          39,015                   0                 *
Sidney Kimmel................................      25,490          25,490                   0                 *
Pollat, Evans & Co. Inc......................       8,844           8,844                   0                 *
Quadra Appreciation Fund, Inc................       3,641           3,641                   0                 *
Peter W. Branagh & Ramona Y. Branagh Trustee
  for the Revocable Trust, dated March 8,
  1993.......................................       1,040           1,040                   0                 *
KA Investments LDC...........................     208,080         208,080                   0                 *
Gleneagle Fund Company.......................      13,005          13,005                   0                 *
Colonial Penn................................      13,005          13,005                   0                 *
Putnam Health Sciences Trust.................     416,161         416,161                   0                 *
Porter Partners, L.P.........................     130,051         130,051                   0                 *
EDJ Limited..................................      26,010          26,010                   0                 *
White Rock Capital Offshore, Ltd.............      62,424          62,424                   0                 *
Quantum Partners LDC.........................     873,600         260,100             613,500              4.04%
Collins Capital Diversified Fund, L.P........     132,116          41,616              90,500                 *
White Rock Capital Partners, L.P.............     194,546         104,040              90,500                 *
Prism Partners I.............................     156,060         156,060                   0                 *
GPZ Trading..................................      52,020          52,020                   0                 *
Triton Capital Investments...................      78,030          78,030                   0                 *
JMG Capital Partners, L.P....................      78,030          78,030                   0                 *
TOTAL........................................                                       1,031,221
</TABLE>
    
 
- ------------------------
 
   
(1) The number of shares of Common Stock owned by each Selling Securityholder
    prior to the Offering includes the shares which may be sold in this
    Offering, together with all other shares of Common Stock owned by each such
    Selling Securityholder on December 31, 1997.
    
 
   
(2) The number of shares for each Selling Securityholder is based on the
    conversion of the Series B Convertible Preferred Stock owned by such Selling
    Securityholder on December 31, 1997 and the payment of dividends in the form
    of shares by the Company for the full term of the Series B Convertible
    Preferred Stock at a rate of $13.96 per Share of Common Stock. The actual
    rate of conversion and dividend payment may vary in accordance with the
    terms and conditions of the Series B Convertible Preferred Stock.
    
 
   
(3) The number of shares of Common Stock owned by each Selling Securityholder
    after completion of the Offering assumes that each Selling Securityholder
    sells all of the shares being offered pursuant to this Registration
    Statement and that no other shares are bought or sold.
    
 
                                       13
<PAGE>
   
(4) The percentage of shares of Common Stock owned by each Selling
    Securityholder after completion of the Offering is based on the number of
    shares of Common Stock owned after completion of the Offering, as set forth
    in the third column, divided by 15,168,035, which was the number of shares
    of Common Stock issued and outstanding on December 31, 1997.
    
 
   
(*) Indicates less than one percent (1%).
    
 
                              PLAN OF DISTRIBUTION
 
    The Selling Securityholders have advised the Company that the Shares may be
sold or distributed from time to time by the Selling Securityholders, or by
pledgees, donees or transferees of, or other successors in interest to, the
Selling Securityholders, directly to one or more purchasers (including pledgees)
or through brokers, dealers or underwriters who may act solely as agents or may
acquire Shares as principals, at market prices prevailing at the time of sale,
at prices related to such prevailing market prices, at negotiated prices, or at
fixed prices, which may be changed. The distribution of the Shares may be
effected by one or more of the following methods: (i) ordinary brokers'
transactions, which may include long or short sales; (ii) transactions involving
cross or block trades or otherwise on the Nasdaq National Market; (iii)
purchases by brokers, dealers or underwriters as principals and resale by such
purchasers for their own accounts pursuant to this Prospectus; (iv) "at the
market" to or through market makers or into an existing market for the Common
Stock; (v) in other ways not involving market makers or established trading
markets, including direct sales to purchasers or sales effected through agents;
(vi) through transactions in options, swaps or other derivatives (whether
exchange-listed or otherwise); or (vii) any combination of the foregoing, or by
any other legally available means. In addition, the Selling Securityholders or
their successors in interest may enter into hedging transactions with
broker-dealers who may engage in short sales of Common Stock in the course of
hedging the positions they assume with the Selling Securityholders. The Selling
Securityholders or their successors in interest may also enter into option or
other transactions with broker-dealers that require the delivery to such
broker-dealers of the Shares, which Shares may be resold thereafter pursuant to
this Prospectus.
 
    Brokers, dealers, underwriters or agents participating in the distribution
of the Shares as agent may receive compensation in the form of discounts,
concessions or commissions from the Selling Securityholders (and, if they act as
agent for the purchaser of such Shares, from such purchaser). Such discounts,
concessions or commissions as to a particular broker, dealer, underwriter or
agent might be greater or less than those customary in the type of transaction
involved.
 
    The Selling Securityholders and any brokers, dealers, underwriters or agents
that participate in the distribution of the Shares may be deemed to be
"underwriters" within the meaning of the Securities Act, and any discounts,
commissions or concessions received by any such persons might be deemed to be
underwriting discounts and commissions under the Securities Act. Neither the
Company nor the Selling Securityholders can presently estimate the amount of
such compensation. The Company knows of no existing arrangements between any
Selling Securityholder and any other Securityholder, broker, dealer, underwriter
or agent relating to the sale or distribution of the Shares.
 
    To the extent required, the Company will file, during any period in which
offers or sales are being made, a supplement to this Prospectus which sets
forth, with respect to a particular offering, the specific number of Shares to
be sold, the name of the Selling Securityholder, the sales price, the name of
any participating broker, dealer, underwriter or agent, any applicable
commission or discount and any other material information with respect to the
plan of distribution not previously disclosed.
 
    The Company will not receive any of the proceeds from the sale of the Shares
offered hereby. The Company will pay substantially all of the expenses incident
to this Offering of the Shares by the Selling Securityholders to the public
other than commissions and discounts of brokers, dealers, underwriters or
agents. The Company has agreed to indemnify the Selling Securityholders and
certain related persons against certain liabilities, including certain
liabilities under the Securities Act.
 
                                       14
<PAGE>
    In order to comply with certain states' securities laws, if applicable, the
Shares will be sold in such jurisdictions only through registered or licensed
brokers or dealers. In addition, in certain states the Common Stock may not be
sold unless the Common Stock has been registered or qualified for sale in such
state or an exemption from registration or qualification is available and is
satisfied.
 
    Pursuant to the Registration Rights Agreement between the Company and the
Selling Securityholders, the Company has agreed to file with the Commission a
Registration Statement on Form S-3 under Rule 415 covering the resale of at
least 200% of the Shares issuable to the Selling Securityholders upon conversion
of and payment of dividends upon the Series B Convertible Preferred Stock. The
Company has agreed to use its best efforts to cause the Registration Statement
to become effective as soon as practicable following the filing of the
Registration Statement, but in any event not later than March 16, 1998.
 
                                 LEGAL MATTERS
 
    The legality of issuance of the shares will be passed upon for the Company
by Wilmer, Cutler & Pickering, Washington, D.C.
 
                                    EXPERTS
 
    The financial statements incorporated in this Prospectus by reference from
the Company's Annual Report on Form 10-K for the year ended March 31, 1997 have
been audited by Deloitte & Touche, LLP, independent auditors, as stated in their
report, which is incorporated herein by reference, and has been so incorporated
in reliance upon the report of such firm given upon their authority as experts
in accounting and auditing.
 
                                       15
<PAGE>
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
    NO DEALER, SALESPERSON OR OTHER PERSON HAS BEEN AUTHORIZED TO GIVE ANY
INFORMATION OR TO MAKE ANY REPRESENTATIONS 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 OR ANY UNDERWRITER. THIS
PROSPECTUS DOES NOT CONSTITUTE AN OFFER TO SELL OR A SOLICITATION OF AN OFFER TO
BUY THE SHARES OF COMMON STOCK BY ANYONE IN ANY JURISDICTION IN WHICH THE OFFER
OR SOLICITATION IS NOT AUTHORIZED, OR IN WHICH THE PERSON MAKING THE OFFER OR TO
DO SO, OR TO ANY PERSON TO WHOM IT IS UNLAWFUL TO MAKE SUCH OFFER OR
SOLICITATION. NEITHER THE DELIVERY OF THIS PROSPECTUS NOR ANY SALE MADE
HEREUNDER SHALL CREATE ANY IMPLICATION THAT INFORMATION CONTAINED HEREIN IS
CORRECT AS OF ANY TIME SUBSEQUENT TO THIS DATE HEREOF.
 
                            ------------------------
 
                               TABLE OF CONTENTS
 
   
<TABLE>
<CAPTION>
                                                    PAGE
                                                  ---------
<S>                                               <C>
Available Information...........................          2
Incorporation of Certain Information by
  Reference.....................................          2
Risk Factors....................................          3
The Company.....................................         10
Use of Proceeds.................................         12
Selling Securityholders.........................         12
Plan of Distribution............................         14
Legal Matters...................................         15
Experts.........................................         15
</TABLE>
    
 
                                5,202,004 SHARES
 
                            IGEN INTERNATIONAL, INC.
                                  COMMON STOCK
 
                             ---------------------
 
                                   PROSPECTUS
 
                             ---------------------
 
   
                                 APRIL 15, 1998
    
 
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