ICOS CORP / DE
S-3/A, 1999-07-22
PHARMACEUTICAL PREPARATIONS
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<PAGE>


  As filed with the Securities and Exchange Commission on July 22, 1999

                                                Registration No. 333-80479
- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------

                      SECURITIES AND EXCHANGE COMMISSION
                            Washington, D.C. 20549

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

                             AMENDMENT NO. 1

                                    TO
                                   FORM S-3
                            REGISTRATION STATEMENT
                                     UNDER
                          THE SECURITIES ACT OF 1933

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

                               ICOS CORPORATION
            (Exact name of Registrant as specified in its charter)

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

<TABLE>
<S>                                                <C>
                     Delaware                                          91-1463450
           (State or other jurisdiction                             (I.R.S. Employer
        of incorporation or organization)                        Identification Number)
</TABLE>

                            22021 20th Avenue S.E.
                           Bothell, Washington 98021
                                (425) 485-1900
  (Address, including zip code, and telephone number, including area code, of
                   Registrant's principal executive offices)

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

                              George B. Rathmann

                                 Chairman
                               ICOS Corporation
                            22021 20th Avenue S.E.
                           Bothell, Washington 98021
                                (425) 485-1900
(Name, address, including zip code, and telephone number, including area code,
                             of agent for service)

                                  Copies to:
                               STEPHEN M. GRAHAM
                                ANDREW B. MOORE
                               Perkins Coie LLP
                         1201 Third Avenue, 48th Floor
                        Seattle, Washington 98101-3099
                                (206) 583-8888

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

  Approximate date of commencement of proposed sale to the public: From time
to time after the effective date of this Registration Statement as determined
by the selling stockholders.

  If the only securities being registered on this Form are being offered
pursuant to dividend or interest reinvestment plans, please check the
following box. [_]

  If any of the securities being registered on this Form are to be offered on
a delayed or continuous basis pursuant to Rule 415 under the Securities Act of
1933, other than securities offered only in connection with dividend or
interest reinvestment plans, check the following box. [X]

  If this Form is filed to register additional securities for an offering
pursuant to Rule 462(b) under the Securities Act of 1933, please check the
following box and list the Securities Act registration statement number of the
earlier effective registration statement for the same offering. [_]

  If this Form is a post-effective amendment filed pursuant to Rule 462(c)
under the Securities Act of 1933, check the following box and list the
Securities Act registration statement number of the earlier effective
registration statement for the same offering. [_]

  If delivery of the prospectus is expected to be made pursuant to Rule 434,
please check the following box. [_]

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

  The registrant hereby amends this registration statement on such date or
dates as may be necessary to delay its effective date until the registrant
shall file a further amendment which specifically states that this
registration statement shall thereafter become effective in accordance with
section 8(a) of the Securities Act of 1933 or until this registration
statement shall become effective on such date as the Securities and Exchange
Commission, acting pursuant to said section 8(a), may determine.

- -------------------------------------------------------------------------------
- -------------------------------------------------------------------------------
<PAGE>



PROSPECTUS

                               7,550,600 Shares

                               ICOS CORPORATION

                                 Common Stock

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

  The selling stockholders listed in this prospectus may offer for sale up to
7,550,600 shares of common stock that may be issued to the selling
stockholders upon the exercise of warrants. The selling stockholders may sell
the common stock to or through broker-dealers who may receive compensation in
the form of discounts, concessions or commissions.

  ICOS will not receive any proceeds from this offering other than the price
paid upon the exercise of the warrants. ICOS will pay all expenses incurred in
registering and listing these shares, including legal and accounting fees.

  The common stock trades on the Nasdaq National Market under the symbol
"ICOS." On July 16, 1999, the last reported sales price of the common stock on
Nasdaq was $41.875 per share.

         Investing in the common stock involves a high degree of risk.
                    See "Risk Factors" beginning on page 4.

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

  Neither the Securities and Exchange Commission nor any state securities
commission has approved or disapproved of these securities or determined
whether this prospectus is truthful or complete. Any representation to the
contrary is a criminal offense.

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

              The date of this prospectus is July 26, 1999.
<PAGE>

                               TABLE OF CONTENTS

<TABLE>
<CAPTION>
                                                                            Page
                                                                            ----
<S>                                                                         <C>
Forward-looking Information................................................   3
How to Obtain More Information.............................................   3
The Company................................................................   3
Risk Factors...............................................................   4
Selling Stockholders.......................................................   9
Use of Proceeds............................................................  10
Plan of Distribution.......................................................  10
Experts....................................................................  11
Legal Matters..............................................................  11
</TABLE>

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

  We have not authorized any person to give you any information or to make any
representations other than those contained in this prospectus. You should not
rely on any information or representations other than this prospectus. This
prospectus is not an offer to sell or a solicitation of an offer to buy any
securities other than the common stock. It is not an offer to sell or a
solicitation of an offer to buy securities if the offer or solicitation would
be unlawful. The affairs of ICOS may have changed since the date of this
prospectus. You should not assume that the information in this prospectus is
correct at any time subsequent to its date.


                                       2
<PAGE>

                          FORWARD-LOOKING INFORMATION

  This prospectus includes "forward-looking statements" within the meaning of
the Private Securities Litigation Reform Act of 1995. This Act provides a
"safe harbor" for forward-looking statements to encourage companies to provide
prospective information about themselves so long as they identify these
statements as forward-looking and provide meaningful cautionary statements
identifying important factors that could cause actual results to differ from
the projected results. All statements other than statements of historical fact
we make in this prospectus or in any document incorporated by reference are
forward-looking. In particular, the statements we make regarding industry
prospects and our future results of operations or financial position are
forward-looking statements. Forward-looking statements reflect our current
expectations and are inherently uncertain. Our actual results may differ
significantly from our expectations. The section entitled "Risk Factors"
describes some, but not all, of the factors that could cause these
differences.

                        HOW TO OBTAIN MORE INFORMATION

  We file reports, proxy statements and other information with the Securities
and Exchange Commission. You may read any document we file at the SEC's public
reference rooms at 450 Fifth Street, N.W., Washington, D.C. 20549. Please call
the SEC toll free at 1-800-SEC-0330 for information about its public reference
rooms. You may also read our filings at the SEC's Web site at
http://www.sec.gov.

  To register these shares, we have filed with the SEC a registration
statement on Form S-3 under the Securities Act of 1933. This prospectus does
not contain all the information in the registration statement. We have omitted
certain parts of the registration statement, as permitted by the rules and
regulations of the SEC. You may inspect and copy the registration statement,
including exhibits, at the SEC's public reference facilities or Web site. Our
statements in this prospectus about the contents of any contract or other
document are not necessarily complete. You should refer to the copy of each
contract or other document we have filed as an exhibit to the registration
statement for complete information.

  The SEC allows us to "incorporate by reference" into this prospectus the
information we file with it. This means that we can disclose important
information to you by referring you to those documents. This information we
incorporate by reference is considered a part of this prospectus, and later
information we file with the SEC will automatically update and supersede this
information. We incorporate by reference the documents listed below and any
future filings we make with the SEC under Sections 13(a), 13(c), 14 and 15(d)
of the Securities Exchange Act of 1934 until this offering is completed:

  . Our Annual Report on Form 10-K for the year ended December 31, 1998;

  . Our Quarterly Report on Form 10-Q for the quarterly period ended March
    31, 1999;

  . Our Current Report on Form 8-K filed with the SEC on June 23, 1999;

  . Our Proxy Statement, dated March 31, 1999, for our 1999 Annual Meeting of
    Stockholders; and

  . The description of our common stock contained in the registration
    statement on Form 8-A filed with the SEC on April 18, 1991, under Section
    12(g) of the Exchange Act.

  You may obtain copies of these documents free of charge by contacting the
investor relations department at our principal offices, which are located at
22021 20th Avenue S.E., Bothell, Washington 98021, (425) 485-1900.

                                  THE COMPANY

  ICOS was formed in 1989 to develop and commercialize proprietary
pharmaceuticals for the treatment of inflammatory diseases and other serious
medical conditions by understanding the underlying mechanisms and identifying
the molecular entities involved.


                                       3
<PAGE>

                                 RISK FACTORS

  In addition to the other information contained in this prospectus, you
should carefully read and consider the following risk factors before
purchasing our common stock. If any of the following risks actually occur, our
business, financial condition or results of operations could be materially
adversely affected. In such case, the trading price of our common stock could
decline, and you may lose all or part of your investment.

  The risks and uncertainties described below are not the only ones facing our
company. Additional risks and uncertainties not presently known to us or that
we currently deem immaterial may also impair our business operations. We
undertake no obligation to publicly release the result of any revisions to
these forward-looking statements that may be made to reflect events or
circumstances after the date hereof or to reflect the occurrence of
unanticipated events.

We have not generated revenues from the sale of products, and we may not be
able to generate enough product revenues in the future to achieve
profitability.

  We have not yet completed the development of any products and we do not
expect to have any products commercially available for several years.
Consequently, we have not generated revenues from the sale of products since
we started operations. We anticipate that our operating expenses will increase
significantly in 1999 and subsequent years as we attempt to complete
development of our potential products and introduce our potential products
into the market. Therefore, even if we do successfully develop products that
can be marketed, we will need to generate significant revenues from those
products to achieve and maintain profitability. If we do become profitable, we
cannot be certain that we can sustain or increase profitability on a quarterly
or annual basis.

Our clinical trials may fail to demonstrate the safety and efficacy of our
products, which could prevent or significantly delay the regulatory approval
of our products.

  Before obtaining regulatory approvals for the sale of any of our potential
products, we must subject those products to extensive preclinical and clinical
testing to demonstrate their safety and effectiveness for humans. We may not
complete our clinical trials of potential products under development and the
results of the trials may fail to demonstrate the safety or effectiveness of
such products to the extent necessary to obtain regulatory approvals. This
could delay or prevent regulatory approval of our potential products.

  At any time during the course of our clinical trials or commercial use of
our products, factors such as delays in patient enrollment in our clinical
trials, the discovery of unacceptable toxicities or side effects, or the
development of disease resistance or other physiological factors could cause
us to interrupt, limit, delay or abort the development or sale of our
potential products.

If we are unable to obtain the additional funding we need to develop and
market our potential products, we may be required to delay, scale back or
eliminate expenditures for some of our programs or contract with third parties
to develop and market our potential products or technologies.

  The development of our potential products will require the commitment of
substantial financial resources to conduct the time-consuming research,
preclinical development and clinical trials necessary to bring our products to
market. We may seek additional funding through public or private financings,
including equity financings, and through other arrangements, including
collaborative arrangements. However, financing may be unavailable when we need
it or may be unavailable on acceptable terms. If adequate funds are
unavailable, we may be required to delay, scale back or eliminate expenditures
for some of our programs or contract with third parties to develop and market
our potential products or technologies.

                                       4
<PAGE>

If we fail to negotiate and maintain collaborative arrangements with third
parties, our development and marketing activities may be delayed or reduced.

  We have entered into, and we expect to enter into in the future,
collaborative arrangements with experienced third parties who perform, or may
in the future perform, development, regulatory compliance, manufacturing and
marketing activities relating to some of our potential products. If we fail to
secure and maintain successful collaborative arrangements, our development and
marketing activities may be delayed or reduced. Currently, we have
collaborative arrangements with Suntory Limited, Eli Lilly and Company, and
other companies and research laboratories. We may enter into similar
arrangements with other collaborators in the future, but we may be unable to
negotiate additional collaborative arrangements or extensions of our existing
arrangements on acceptable terms. If we do, any extended or additional
arrangements may not be successful.

  Our ability to obtain successful collaborative participation will depend on
a number of factors, including the achievement of research objectives by us
and our collaborators and any existing or potential collaborators' financial,
competitive, marketing and strategic considerations, such as the relative
advantages of alternative products being marketed or developed by others.

We could experience price pressure or reduced demand for our products as a
result of inadequate third-party reimbursement of the patient costs of our
products and the trend toward managed healthcare and government insurance
programs.

  Our ability to sell products successfully in the future depends in part on
the extent to which various third parties are willing to reimburse the patient
costs of our products and related treatments. These third parties include
government authorities, private health insurers and other organizations, such
as health maintenance organizations. Third-party payors are increasingly
challenging the prices charged for medical products and services. Accordingly,
if less costly drugs are available, third-party payors may not authorize or
may limit reimbursement for our products, even if our products are safer or
more effective than the alternatives. In addition, the trend toward managed
healthcare and government insurance programs could result in lower prices and
reduced demand for our products. Cost containment measures instituted by
healthcare providers, including, for example, practice protocols and
guidelines for use of products, and general healthcare reform may also affect
our ability to sell products in sufficient quantities, or at adequate prices,
to become profitable. We cannot predict the effect of future legislation or
regulation concerning the healthcare industry and third-party coverage and
reimbursement on our business.

We may be unable to establish the manufacturing and sales and marketing
capabilities necessary to become profitable.

  Currently, we do not have facilities for the manufacture of small molecule
products, such as IC351, and we may not have sufficient manufacturing capacity
to manufacture all of our biological products in quantities necessary for
commercial sale. In addition, our manufacturing capacity may be inadequate to
complete all clinical trials contemplated by us over time. We expect to
develop our manufacturing capacity by expanding our current facilities,
building new facilities or contracting with other parties for manufacturing
services. We may not, however, be able to acquire all the manufacturing
resources necessary to become profitable.

  We also do not have direct sales or marketing capabilities. If we decide to
market our potential products through a direct sales force, we would need to
either hire a sales force with expertise in pharmaceutical sales or contract
with a third party to provide a sales force to meet our needs. We may be
unable to develop a direct sales force or establish other distribution
channels necessary for us to generate enough sales to become profitable.

We may be unable to protect our intellectual property rights adequately.

  Our success and ability to compete depend on our licensed and internally
developed technology. Despite our efforts to protect our proprietary rights,
unauthorized parties may copy, develop independently or otherwise

                                       5
<PAGE>

obtain and use our products or technology. We protect our proprietary
technology through a combination of patent, copyright, trade secret and
trademark law. We also enter into confidentiality or license agreements with
our employees, consultants and corporate partners.

  We cannot be sure that our pending patent applications will result in issued
patents. In addition, our issued patents or pending applications may be
challenged or circumvented by our competitors. Policing unauthorized use of
our intellectual property will be difficult, and we cannot be certain that we
will be able to prevent misappropriation of our technology, particularly in
countries where the laws may not protect our proprietary rights as fully as in
the United States.

Intellectual property claims and litigation could subject us to significant
liability for damages and invalidation of our proprietary rights.

  In the future, we may have to resort to litigation to protect our
intellectual property rights, to protect our trade secrets or to determine the
validity and scope of the proprietary rights of others. Any litigation,
regardless of its success, would probably be costly and require significant
time and attention of our key management and technical personnel. Litigation
could also force us to stop or delay selling, manufacturing or using products
that incorporate the challenged intellectual property, pay damages or enter
into licensing or royalty agreements which may be unavailable on acceptable
terms.

We may be unable to compete successfully in the highly competitive market for
pharmaceutical and biotechnological products.

  The market in which we compete is well established and intensely
competitive. We may be unable to compete successfully against our current and
future competitors. Our failure to compete successfully may result in pricing
reductions, reduced gross margins and failure to achieve market acceptance.

  Many entities are engaged in developing pharmaceutical and biotechnological
products for human therapeutic applications, including the applications
targeted by us. Our competitors include pharmaceutical companies, chemical
companies, specialized biotechnology companies, and research and academic
institutions. Many of these organizations have substantially more capital,
research and development, regulatory, manufacturing, marketing, human and
other resources and experience than we do. As a result, they may be able to
adapt more quickly to new technologies, devote greater resources to the
promotion or sale of their products, initiate or withstand substantial price
competition, or take advantage of acquisition or other opportunities more
readily.

Rapid changes in technology and industry standards could render our potential
products unmarketable or obsolete.

  We are engaged in a field characterized by extensive research efforts and
rapid technological development. New drug discoveries and developments in our
field and other drug discovery technologies are accelerating. Our competitors
may develop technologies and products that are more effective than any we
develop or that render our technology and potential products obsolete or
noncompetitive. In addition, our potential products could become obsolete or
unmarketable if new industry standards emerge. To be successful, we will need
to continually enhance our products and to design, develop and market new
products that keep pace with new technological and industry developments.

Our stock price has been and is likely to continue to be volatile, which could
cause the market price of our common stock to decline, and you may be unable
to sell your shares at or above your purchase price.

  The market prices for our common stock and for securities of biotechnology
and pharmaceutical companies generally have been volatile in the past and are
likely to continue to be volatile in the future. If you decide to purchase our
shares, you may not be able to resell them at or above the price you paid due
to a number of factors,

                                       6
<PAGE>

including actual or anticipated variations in quarterly operating results,
results and progress of preclinical studies and clinical trials, changes in
earnings estimates by analysts, announcements of technological innovations or
new products by our competitors, changes in the structure of the healthcare
financing and payment systems, general conditions in the biotechnology and
pharmaceutical industry, and significant sales of our common stock by one or
more of our principal stockholders.

Government regulatory authorities may not approve our potential products.

  The U.S. Food and Drug Administration and comparable agencies in foreign
countries impose substantial requirements on biotechnology and pharmaceutical
companies during development of potential products. These requirements include
lengthy and detailed laboratory and clinical testing procedures, sampling
activities and other costly and time-consuming procedures surrounding the
development and testing of proposed products. Governmental regulation also
affects the manufacture and marketing of pharmaceutical products. If we do not
receive the necessary governmental approvals to market our products, we will
be unable to sell our products and our business may fail.

  Any future FDA or other governmental approval of our potential products may
entail limitations on the indicated uses for which these products may be
marketed. The effect of governmental regulation may be to delay marketing new
products for a considerable period of time, to impose costly requirements on
our activities or to provide a competitive advantage to our competitors. In
addition, compliance with the regulations of these agencies may delay or
prevent us from introducing new or improved products or require us to stop
marketing our products. If we fail to comply with the laws and regulations
pertaining to our business, we may be subject to sanctions, including the
temporary or permanent suspension of operations, product recalls and marketing
restrictions.

We may be required to defend lawsuits or pay damages in connection with the
alleged or actual harm caused by our products.

  Product liability is a risk in the testing and marketing of biotechnology
and pharmaceutical products. We face an inherent business risk of exposure to
product liability claims in the event that the use of our technology or
products is alleged to have resulted in harm to others. This risk exists in
human clinical trials as well as in commercial distribution. The biotechnology
and pharmaceutical industry in general has been subject to significant medical
malpractice litigation. We may incur significant liability in the event of
such litigation. Although we maintain product liability insurance, we cannot
be sure that this coverage is adequate or that it will continue to be
available on acceptable terms.

We may be exposed to substantial environmental liability arising from our
activities involving the use of hazardous materials.

  Our research and development activities involve the controlled use of
hazardous materials, chemicals, viruses and radioactive compounds. In the
event of an accident involving these materials, we could be held liable for
any damages that result, and that liability could exceed our resources. We are
subject to federal, state and local laws and regulations governing the use,
manufacture, storage, handling and disposal of hazardous materials and certain
waste products. Although we believe that our operations comply with the
standards prescribed by these laws, the risk of accidental contamination or
injury from these materials cannot be completely eliminated.

We depend on highly qualified management and technical personnel who may not
remain with us.

  We are highly dependent on the efforts and abilities of our current key
technical and managerial personnel. Our success will depend in part on
retaining the services of our existing management and key personnel and
attracting and retaining new highly qualified personnel. Failure to retain our
existing key management and technical personnel or to attract additional
highly qualified personnel could, among other things, inhibit our ability to
negotiate additional collaborative arrangements, delay preclinical or clinical
testing of our products, obstruct our ongoing discovery research, or delay the
regulatory approval process.

                                       7
<PAGE>

  In our field, competition for qualified management and technical personnel
is intense. This competition is particularly acute at this time due to the low
unemployment rate experienced nationally. In addition, many of the companies
with which we compete for experienced personnel have greater financial and
other resources than we do. As a result of these factors, we may be
unsuccessful in recruiting and retaining sufficient qualified personnel.

Future sales of our common stock may depress our stock price.

  Sales in the public market of substantial amounts of our common stock,
including the offer or sale of these shares, could depress prevailing market
prices of our common stock. As of June 30, 1999, we had 43,802,411 shares of
our common stock outstanding. In addition to the up to 7,550,600 shares of
common stock that the selling stockholders may offer or sell in connection
with this offering, as of June 30, 1999, we had granted options or warrants to
purchase 11,277,430 shares of our common stock. These options or warrants
generally have an exercise price that is substantially below the prevailing
market price of our common stock as of June 30, 1999. The exercise of those
options or warrants, and the prompt resale of the common stock received, may
result in downward pressure on the price of our common stock. The existence of
the currently outstanding warrants and options to purchase our common stock
may negatively affect our ability to complete future equity financings at
acceptable prices and on acceptable terms.

If we or our key outside vendors encounter Year 2000 computer problems,
development of our products may be delayed.

  Many currently installed computer systems are not capable of distinguishing
21st century dates from 20th century dates. As a result, beginning on January
1, 2000, computer systems and software used by many companies and
organizations in a wide variety of industries may produce erroneous results,
or fail, unless they are modified or upgraded to process date information
correctly. Year 2000 problems with our computer systems or the systems of our
key outside vendors might cause delays in our development activities or in our
clinical trials and ultimately delay the launch of our potential products.

  Currently, we are in the process of analyzing our software and computer
systems and the Year 2000 status of our key outside vendors. We believe that
we have already addressed many of our expected internal Year 2000 issues
through normal upgrades and new purchases of software and computer equipment.
However, it is possible that after analyzing our systems for Year 2000 issues,
making necessary upgrades and replacements to our systems and testing our
systems, we may still encounter Year 2000 problems. Furthermore, it is
possible that some of our key outside vendors will fail to correct in a timely
fashion, if at all, their own Year 2000 problems.


                                       8
<PAGE>

                             SELLING STOCKHOLDERS

  In June 1999, we issued Series B Limited Partner Warrants to purchase an
aggregate of up to 7,550,600 shares of our common stock at an exercise price
of $52.49 per share. Each of the warrant holders holds an interest in ICOS
Clinical Partners, L.P., a limited partnership formed to support the
development of certain products, which is party to a product development
agreement with us. The warrants may be exercised in whole or in part at any
time after July 30, 1999 and before July 1, 2004. Under the terms of the
warrants, we are obligated to use our commercially reasonable efforts to
maintain an effective registration statement for the entire exercise period to
facilitate public resales of shares received on exercise of the warrants.
After exercise of their warrants, the selling stockholders may offer or sell
the shares received upon exercise of the warrants from time to time in the
manner contemplated under "Plan of Distribution." The selling stockholders may
also, where permitted, resell the shares in private transactions pursuant to
Rule 144 under the Securities Act of 1933, as amended.

  The following table provides certain information as of June 30, 1999
regarding each selling stockholder and the maximum number of shares each may
offer, assuming they choose to exercise their warrants and elect to sell the
shares they receive under this prospectus.

<TABLE>
<CAPTION>
                                                           Shares of Common
                                                          Stock Beneficially
                                                Maximum       Owned After
                                 Shares of     Number of      Offering(2)
                                Common Stock    Shares   ---------------------
                                Beneficially   That May            Percentage
                                Owned Prior     Be Sold             of Common
                                     to         In This               Stock
             Name               Offering(1)    Offering   Amount   Outstanding
             ----               ------------   --------- --------- -----------
<S>                             <C>            <C>       <C>       <C>
George B. Rathmann.............  2,864,756(3)    328,000 2,536,756     5.7%
Thomas P. St. John.............    220,445(4)      2,000   218,445       *
Frank T. Cary..................    187,087(5)      8,000   179,087       *
James L. Ferguson..............    170,837(6)      8,000   162,837       *
William H. Gates, III..........  5,702,983(7)    328,000 5,374,983    12.1%
Robert W. Pangia...............    147,837(5)      8,000   139,837       *
All other Selling Stockholders
 as a group
 (1,401 persons)(8)............                6,868,600
</TABLE>
- --------
 * Less than 1%.

(1) Beneficial ownership is determined in accordance with the rules of the SEC
    and generally includes voting or investment power with respect to
    securities. The shares of common stock subject to options or warrants
    currently exercisable or exercisable within 60 days of June 30, 1999 are
    deemed outstanding and to be beneficially owned by the selling stockholder
    holding such options or warrants for the purpose of computing the
    percentage ownership of such selling stockholder, but are not treated as
    outstanding for the purpose of computing the percentage ownership of any
    other selling stockholder.

(2) Computed in accordance with Rule 13d-3(d)(1)(i) promulgated under the
    Exchange Act and based on 43,802,411 shares of our common stock
    outstanding as of June 30, 1999, treating as outstanding the number of
    shares issuable upon the assumed exercise in full by the named selling
    stockholder of such selling stockholder's warrant and assuming the sale of
    all the shares received upon such exercise, but not assuming the exercise
    of the warrants of any other selling stockholder.

(3) Includes 1,012,601 shares issuable upon exercise of stock options or
    warrants that are exercisable within 60 days of June 30, 1999 and 180,000
    shares held by the Rathmann Family Revocable Trust. Mr. Rathmann is
    Chairman of the board of directors of ICOS.

                                       9
<PAGE>


(4) Includes 177,945 shares issuable upon exercise of stock options or
    warrants that are exercisable within 60 days of June 30, 1999. Mr. St.
    John is Vice President, Therapeutic Development of ICOS.

(5) Includes 147,837 shares issuable upon exercise of stock options or
    warrants that are exercisable within 60 days of June 30, 1999. Messrs.
    Cary and Pangia are members of the board of directors of ICOS.

(6) Includes 155,837 shares issuable upon exercise of stock options or
    warrants that are exercisable within 60 days of June 30, 1999. Mr.
    Ferguson is a member of the board of directors of ICOS.

(7) Includes 677,364 shares issuable upon exercise of stock options or
    warrants that are exercisable within 60 days of June 30, 1999. Mr. Gates
    is a member of the board of directors of ICOS.

(8) Represents unaffiliated selling stockholders that, to our knowledge, do
    not beneficially own 1% or more of our common stock.

                                USE OF PROCEEDS

  We will receive the proceeds of any exercise of the warrants. If all the
warrants are exercised, we will receive aggregate gross proceeds of
$396,330,994, but there can be no assurance that any or all of the warrants
will be exercised. After payment of our expenses related to this offering,
which are estimated to be approximately $140,000, any remaining net proceeds
received by us will be used for general corporate purposes.

  We will not receive any proceeds from the sale of the shares by the selling
stockholders and we will pay all expenses incurred in registering and listing
the shares, including legal and accounting fees.

                             PLAN OF DISTRIBUTION

  Our common stock is traded on Nasdaq. The shares may be sold from time to
time by the selling stockholders in transactions in the over-the-counter
market, through Nasdaq or on one or more other securities markets and
exchanges, in privately negotiated transactions, or through the writing of
options on the shares. They may sell the shares at fixed prices that may be
changed, at market prices prevailing at the time of sale, at prices relating
to such prevailing market prices or at negotiated prices. The selling
stockholders may effect such transactions by selling these shares to or
through broker-dealers, including through block trades in which brokers or
dealers may attempt to sell these shares as agents but may position and resell
the block as principals to facilitate the transaction.

  Any broker-dealers participating in the distribution of these shares may
receive compensation in the form of discounts, concessions or commissions from
the selling stockholders and/or the purchasers of the shares for whom such
broker-dealers may act as agents or to whom they may sell as principals, or
both. In connection with any sales of these shares by any selling stockholder,
such selling stockholder and any broker-dealers who participate in such sale
may be deemed to be "underwriters" as defined in the Securities Act. Any
commissions paid or any discounts or concessions allowed to any such broker-
dealers, and any profits received on the resale of such shares of common stock
purchased by them, may be deemed to be underwriting discounts and commissions
under the Securities Act.

  The rules of the SEC generally prohibit underwriters, brokers, dealers and
certain other persons engaged or participating in the distribution of these
shares, including the selling stockholders, from making a market in such
shares during the "cooling off" period preceding the commencement of such
distribution, which may limit the timing of purchases and sales of our common
stock by the selling stockholders.

  In order to comply with the securities laws of certain states, if
applicable, these shares will be sold in such jurisdictions only through
registered or licensed brokers or dealers. In addition, in certain states
these shares may not be sold unless they have been registered or qualified for
sale in the applicable state or an exemption from the registration or
qualification requirement is available and complied with.

                                      10
<PAGE>

  Pursuant to the terms of the warrants, we have agreed to bear all expenses
incurred in registering and listing these shares.

  There can be no assurance that any selling stockholder will exercise its
warrant in whole or in part or sell any or all of the shares offered
hereunder. It is anticipated that this offering will remain in effect until
June 30, 2004 or until all of these shares have been sold, whichever is
earlier.

                                    EXPERTS

  The consolidated financial statements of ICOS Corporation and subsidiary as
of December 31, 1998 and 1997 and for each of the years in the three-year
period ended December 31, 1998 have been incorporated by reference herein and
in the registration statement in reliance on the report of KPMG LLP,
independent certified public accountants, incorporated by reference herein,
and upon the authority of said firm as experts in accounting and auditing.

                                 LEGAL MATTERS

  The validity of the common stock offered hereby has been passed upon for
ICOS by Perkins Coie LLP, Seattle, Washington.


                                      11
<PAGE>



                                7,550,600 Shares


                                ICOS CORPORATION

                                  Common Stock

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

                                   PROSPECTUS

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

                               July 26, 1999
<PAGE>

                                    PART II

                    INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14. Other Expenses of Issuance and Distribution

  The following table sets forth the costs and expenses payable by the
registrant in connection with the sale of the securities being registered. All
amounts are estimates except the SEC registration fee and the Nasdaq National
Market additional listing fee.

<TABLE>
<S>                                                                    <C>
  Securities and Exchange Commission registration fee................. $ 92,696
  Nasdaq National Market additional listing fee.......................   17,500
  Printing and engraving expenses.....................................   10,000
  Legal fees and expenses.............................................   10,000
  Accounting fees and expenses........................................    5,000
  Miscellaneous fees and expenses.....................................    4,804
                                                                       --------
    Total............................................................. $140,000
                                                                       ========
</TABLE>

Item 15. Indemnification of Directors and Officers

  Section 145(a) of the Delaware General Corporation Law provides that a
Delaware corporation may indemnify any person who was or is made or is
threatened to be made a party to any threatened, pending or completed action,
suit or proceeding, whether civil, criminal, administrative or investigative
(other than an action by or in the right of the corporation) by reason of the
fact that such person is or was a director, officer, employee or agent of the
corporation or is or was serving at the request of the corporation as a
director, officer, employee or agent of another corporation or enterprise,
against expenses, judgments, fines and amounts paid in settlement actually and
reasonably incurred by such person in connection with such action, suit or
proceeding if such person acted in good faith and in a manner he or she
reasonably believed to be in or not opposed to the best interests of the
corporation, and, with respect to any criminal action or proceeding, had no
cause to believe his or her conduct was unlawful.

  Section 145(b) of the DGCL provides that a Delaware corporation may
indemnify any person who was or is a party or is threatened to be made a party
to any threatened, pending or completed action or suit by or in the right of
the corporation to procure a judgment in its favor by reason of the fact that
such person acted in any of the capacities set forth above, against expenses
actually and reasonably incurred by such person in connection with the defense
or settlement of such action or suit if such person acted under similar
standards, except that no indemnification may be made in respect of any claim,
issue or matter as to which such person shall have been adjudged to be liable
to the corporation unless and only to the extent that the Court of Chancery or
the court in which such action or suit was brought shall determine that
despite the adjudication of liability, such person is fairly and reasonably
entitled to be indemnified for such expenses which the Court of Chancery or
such other court shall deem proper.

  Section 145 of the DGCL further provides that to the extent a director or
officer of a Delaware corporation has been successful in the defense of any
action, suit or proceeding referred to in subsections 145(a) and (b) or in the
defense of any claim, issue or matter therein, such person shall be
indemnified against expenses actually and reasonably incurred by such person
in connection therewith; that indemnification provided for by Section 145
shall not be deemed exclusive of any other rights to which the indemnified
party may be entitled; and that the corporation may purchase and maintain
insurance on behalf of a director or officer of the corporation against any
liability asserted against such person or incurred by him or her in any such
capacity or arising out of his or her status as such whether or not the
corporation would have the power to indemnify such person against such
liabilities under Section 145.


                                     II-1
<PAGE>

  Section 10 of ICOS' Amended and Restated Bylaws requires indemnification of
officers and directors to the fullest extent permitted under Delaware law.
Subject to any restrictions imposed by Delaware law, the bylaws provide an
unconditional right to indemnification for all expense, liability and loss
(including attorneys' fees, judgments, fines, ERISA excise taxes or penalties
and amounts paid in settlement) actually and reasonably incurred or suffered
by any person entitled to indemnification in connection with any actual or
threatened action, suit or proceeding, whether civil, criminal, administrative
or investigative, by reason of the fact that such person is or was serving as
a director or officer of ICOS or that, being or having been a director or
officer or an employee of ICOS, such person is or was serving at the request
of ICOS as a director, officer, employee or agent of another corporation,
partnership, joint venture, trust or other enterprise, including an employee
benefit plan. However, board approval is required with respect to
indemnification for any proceeding initiated by a person entitled to
indemnification. The bylaws also provide that ICOS may, by action of its board
of directors, provide indemnification to its employees and agents with the
same scope and effect as the foregoing indemnification of directors and
officers.

  Section 102(b)(7) of the DGCL permits a corporation to provide in its
certificate of incorporation that a director of the corporation shall not be
personally liable to the corporation or its stockholders for monetary damages
for breach of fiduciary duty as a director, except for liability for (i) any
breach of the director's duty of loyalty to the corporation or its
stockholders, (ii) acts or omissions not in good faith or that involve
intentional misconduct or a knowing violation of law, (iii) payments of
unlawful dividends or unlawful stock repurchases or redemptions, or (iv) any
transaction from which the director derived an improper personal benefit.

  Article 10 of ICOS' Restated Certificate of Incorporation provides that, to
the fullest extent that the DGCL, as it now exists or may hereafter be
amended, permits the limitation or elimination of the liability of directors,
a director of ICOS shall not be liable to ICOS or its stockholders for
monetary damages for breach of fiduciary duty as a director. Any amendment to
or repeal of such Article 10 shall not adversely affect any right or
protection of a director of ICOS for or with respect to any acts or omissions
of such director occurring prior to such amendment or repeal.

  ICOS' officers and directors are covered by insurance (with certain
exceptions and limitations) that indemnifies them against losses for which
ICOS grants them indemnification and for which they become legally obligated
to pay on account of claims made against them for "wrongful acts" committed
before or during the policy period. Additionally, ICOS' outside directors are
covered by a similar insurance policy.

Item 16. Exhibits

<TABLE>
   <C>  <S>
    5.1 Opinion of Perkins Coie LLP, counsel to ICOS*
   23.1 Consent of KPMG LLP, independent certified public accountants
   23.2 Consent of Perkins Coie LLP (contained in Exhibit 5.1)*
   24.1 Power of attorney*
</TABLE>
- --------

*Previously filed.

Item 17. Undertakings

  A. The undersigned registrant hereby undertakes;

    (1) To file, during any period in which offers or sales are being made, a
  post-effective amendment to this registration statement to include any
  material information with respect to the plan of distribution not
  previously disclosed in this registration statement or any material change
  to such information in this registration statement;

    (2) That, for the purpose of determining any liability under the
  Securities Act of 1933, each such post-effective amendment shall be deemed
  to be a new registration statement relating to the securities offered
  therein, and the offering of such securities at that time shall be deemed
  to be the initial bona fide offering thereof; and

                                     II-2
<PAGE>

    (3) To remove from registration by means of a post-effective amendment
  any of the securities being registered which remain unsold at the
  termination of the offering.

  B. The undersigned registrant hereby undertakes that, for purposes of
determining any liability under the Securities Act of 1933, each filing of the
registrant's annual report pursuant to Section 13(a) or Section 15(d) of the
Securities Exchange Act of 1934 (and, where applicable, each filing of an
employee benefit plan's annual report pursuant to Section 15(d) of the
Securities Exchange Act of 1934) that is incorporated by reference in the
registration statement shall be deemed to be a new registration statement
relating to the securities offered herein, and the offering of such securities
at that time shall be deemed to be the initial bona fide offering thereof.

  C. Insofar as indemnification for liabilities arising under the Securities
Act of 1933 may be permitted to directors, officers and controlling persons of
the registrant pursuant to the foregoing provisions, or otherwise, the
registrant has been advised that in the opinion of the Securities and Exchange
Commission such indemnification is against public policy as expressed in the
Securities Act and is, therefore, unenforceable. In the event that a claim for
indemnification against such liabilities (other than the payment by the
registrant of expenses incurred or paid by a director, officer or controlling
person of the registrant in the successful defense of any action, suit or
proceeding) is asserted by such director, officer or controlling person in
connection with the securities being registered, the registrant will, unless
in the opinion of its counsel the matter has been settled by controlling
precedent, submit to a court of appropriate jurisdiction the question of
whether such indemnification by it is against public policy as expressed in
the Securities Act and will be governed by the final adjudication of such
issue.

  D. The undersigned registrant hereby undertakes that:

    (1) For purposes of determining any liability under the Securities Act of
  1933, the information omitted from the form of prospectus filed as part of
  this registration statement in reliance upon Rule 430A and contained in a
  form of prospectus filed by the Registrant pursuant to Rule 424(b)(1) or
  (4) or 497(h) under the Securities Act shall be deemed to be part of this
  registration statement as of the time it was declared effective.

    (2) For the purpose of determining any liability under the Securities Act
  of 1933, each post-effective amendment that contains a form of prospectus
  shall be deemed to be a new registration statement relating to the
  securities offered therein, and the offering of such securities at that
  time shall be deemed to be the initial bona fide offering thereof.

                                     II-3
<PAGE>

                                  SIGNATURES

  Pursuant to the requirements of the Securities Act of 1933, the registrant
certifies that it has reasonable grounds to believe that it meets all the
requirements for filing on Form S-3 and has duly caused this Amendment No. 1
to the registration statement to be signed on its behalf by the undersigned,
thereunto duly authorized, in the City of Bothell, State of Washington, on the
22nd day of July, 1999.

                                          ICOS CORPORATION

                                                /s/ Howard S. Mendelsohn
                                          By: _________________________________
                                                    Howard S. Mendelsohn
                                                  Chief Accounting Officer

  Pursuant to the requirements of the Securities Act of 1933, as amended, this
Amendment No. 1 to the registration statement has been signed by the following
persons in the capacities indicated on July 22, 1999.

<TABLE>
<CAPTION>
                  Signature                                      Title
                  ---------                                      -----

 <C>                                         <S>
            /s/ Paul N. Clark                Chief Executive Officer, President and
 ___________________________________________  Director
                Paul N. Clark

         /*/ George B. Rathmann              Chairman of the Board
 ___________________________________________
             George B. Rathmann

           /*/ Gary L. Wilcox                Director and Executive Vice President,
 ___________________________________________  Operations
               Gary L. Wilcox

        /s/ Howard S. Mendelsohn             Chief Accounting Officer (Principal
 ___________________________________________  Financial and Accounting Officer)
            Howard S. Mendelsohn

            /*/ Frank T. Cary                Director
 ___________________________________________
                Frank T. Cary
          /*/ James L. Ferguson              Director
 ___________________________________________
              James L. Ferguson

        /*/ William H. Gates III             Director
 ___________________________________________
            William H. Gates III

           /*/ Janice M. LeCoq               Director
 ___________________________________________
               Janice M. LeCoq
</TABLE>



                                     II-4
<PAGE>

<TABLE>
<CAPTION>
                  Signature                                      Title
                  ---------                                      -----

 <C>                                         <S>
          /*/ David V. Milligan              Director
 ___________________________________________
              David V. Milligan

 ___________________________________________ Director
              Robert W. Pangia

       /*/ Alexander B. Trowbridge           Director
 ___________________________________________
           Alexander B. Trowbridge

          /*/ Walter B. Wriston              Director
 ___________________________________________
              Walter B. Wriston
 *By:    /s/ Howard S. Mendelsohn
    ________________________________________
              Howard S. Mendelsohn
                Attorney-in-Fact
</TABLE>

                                      II-5
<PAGE>

                                 EXHIBIT INDEX

<TABLE>
<CAPTION>
 Exhibit
 Number
 -------
 <C>     <S>
   5.1   Opinion of Perkins Coie LLP, counsel to ICOS*
  23.1   Consent of KPMG LLP, independent certified public accountants
  23.2   Consent of Perkins Coie LLP (contained in Exhibit 5.1)*
  24.1   Power of attorney*
</TABLE>
- --------

*Previously filed.

<PAGE>

                                                                    Exhibit 23.1

              CONSENT OF INDEPENDENT CERTIFIED PUBLIC ACCOUNTANTS

The Board of Directors
ICOS Corporation:

  We consent to the use of our report incorporated herein by reference and to
the reference to our firm under the heading "Experts" in the prospectus.

                                          /s/ KPMG LLP

Seattle, Washington

July 19, 1999


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