CUBIST PHARMACEUTICALS INC
POS AM, 1998-01-09
PHARMACEUTICAL PREPARATIONS
Previous: STORAGE USA INC, SC 13D/A, 1998-01-09
Next: GART SPORTS CO, S-8, 1998-01-09



<PAGE>

      As filed with the Securities and Exchange Commission on January 9, 1998

                                                   Registration No. 333-33883

                                           
                          SECURITIES AND EXCHANGE COMMISSION
                                Washington, D.C. 20549

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

                            POST-EFFECTIVE AMENDMENT NO. 1
                                     to FORM S-1
                                          on
                                       FORM S-3
                             REGISTRATION STATEMENT UNDER
                              THE SECURITIES ACT OF 1933

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

                             CUBIST PHARMACEUTICALS, INC.
                (Exact name of registrant as specified in its charter)


<TABLE>
<S>                                   <C>                                   <C>
           DELAWARE                               2830                          22-3192085
(State or other jurisdiction of       (Primary Standard Industrial           (I.R.S. Employer
  Classification Code Numbers)        incorporation or organization)        identification No.)

</TABLE>


                                   24 Emily Street
                                 Cambridge, MA 02139
                                    (617) 576-1999
     (Address, including zip code, and telephone number, including area code, of
registrant's principal executive offices)

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

                               Scott M. Rocklage, Ph.D.
                        President and Chief Executive Officer
                             Cubist Pharmaceuticals, Inc.
                                   24 Emily Street
                                 Cambridge, MA 02139
                                    (617) 576-1999
  (Name, address, including zip code, and telephone number, including area 
code, of agent for service)

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

                                   with copies to:

                               Justin P. Morreale, Esq.
                                 Julio E. Vega, Esq.
                                   Bingham Dana LLP
                                  150 Federal Street
                                   Boston, MA 02110
                                    (617) 951-8000

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

         Approximate date of commencement of proposed sale to the public:
    As soon as practicable after this Registration Statement becomes effective

   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, 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, 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, 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 the Registration 
Statement shall become effective on such date as the Commission, acting 
pursuant to Section 8(a), may determine.

<PAGE>

 PROSPECTUS

                              1,265,307 Shares

                         CUBIST PHARMACEUTICALS, INC.
                                Common Stock

     All of the 1,265,307 shares of Common Stock offered hereby are being 
sold by certain stockholders (the "Selling Stockholders") of Cubist 
Pharmaceuticals, Inc. ("Cubist" or the "Company").  See "Principal and 
Selling Stockholders." The Company will not receive any of the proceeds from 
the sale of shares by the Selling Stockholders. The Company's Common Stock is 
listed on the Nasdaq National Market under the symbol "CBST".  On January 7, 
1998, the closing sale price of the Common Stock, as reported on the Nasdaq 
National Market, was $5.00 per share.

     The Common Stock offered hereby involves a high degree of risk.
                 See "Risk Factors," beginning on page 3.
                                           
                                    ---------------

THESE SECURITIES HAVE NOT BEEN APPROVED OR DISAPPROVED BY THE SECURITIES AND 
EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION NOR HAS THE SECURITIES 
AND EXCHANGE COMMISSION OR ANY STATE SECURITIES COMMISSION PASSED UPON THE 
ACCURACY OR ADEQUACY OF THIS PROSPECTUS. ANY REPRESENTATION TO THE CONTRARY 
IS A CRIMINAL OFFENSE. 

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

     The Company has been advised by the Selling Stockholders that all or a 
portion of the shares of Common Stock offered hereby may be sold by the 
Selling Stockholders from time to time in one or a combination of the 
following transactions: (a) transactions (which may involve crosses or block 
transactions) on the National Market System of the Nasdaq Stock Market, or 
otherwise, at fixed prices, at market prices prevailing at the time of sale, 
at prices related to such prevailing market prices or at varying prices 
determined at the time of sale; or (b) privately negotiated transactions at 
negotiated prices. The Selling Stockholders may effect such transactions by 
selling such shares directly to purchasers or by selling such shares to or 
through brokers or dealers and such brokers or dealers may receive 
compensation in the form of discounts, concessions or commissions from the 
Selling Stockholders or the purchasers of such shares for whom such brokers 
or dealers may act as agent, or to whom they sell as principal, or both. See 
"Plan of Distribution." 

     No dealer, salesperson or other person has been authorized to give any 
information or to make any representations not contained in this Prospectus 
or any Prospectus Supplement, and, if given or made, such information or 
representations must not be relied upon as having been authorized by the 
Company.  Neither this Prospectus nor any Prospectus Supplement constitutes 
an offer to sell or a solicitation of an offer to buy any of the securities 
offered hereby in any jurisdiction to any person to whom it is unlawful to 
make such an offer in such jurisdiction.  Neither the delivery of this 
Prospectus or any Prospectus Supplement nor any sale made thereunder shall, 
under any circumstances, create any implication that there has been no change 
in the affairs of the Company since the date hereof or thereof.

<TABLE>
<CAPTION>
- -----------------------------------------------------------------------------------------------
                                               Underwriting Discounts       Proceeds to Selling
                     Price to Public              and Commissions                Stockholder
- -----------------------------------------------------------------------------------------------
<S>                        <C>                         <C>                          <C>     
Per Share                  (l)                         (1)(2)                       (1)(2)
- -----------------------------------------------------------------------------------------------
Total                      (1)                         (1)(2)                       (1)(2)
- -----------------------------------------------------------------------------------------------
</TABLE>

(1)  The Selling Stockholders may from time to time effect the sale of the
     Shares at prices and at terms then prevailing or at prices related to the
     then-current market price, or in negotiated transactions.  Under the
     securities laws of certain states, the Shares may be sold in such states
     only through registered or licensed brokers or dealers.  See "Plan of
     Distribution" and "Selling Stockholders."

<PAGE>
(2)  The Company has agreed to prepare and file this Prospectus and the related
     Registration Statement and supplements and amendments thereto required by
     the Securities Act with the Securities and Exchange Commission, and to 
     deliver copies of the Prospectus to the Selling Stockholders.  The 
     expenses incurred in connection with the same, estimated at $44,490, will
     be borne by the Company.  The Selling Stockholders and any broker-dealers,
     agents or underwriters who participate in a sale of the Shares may be 
     deemed "underwriters" within the meaning of the Securities Act, and any 
     commissions paid or discounts allowed to, and any profits received on 
     Shares by, any of them may be deemed to be underwriting discounts or
     resale of the commissions under the Securities Act.  See "Plan of 
     Distribution."  The Company will not be responsible for any discounts, 
     concessions, commissions or other compensation due to any broker or dealer
     in connection with the sale of any of the shares offered hereby, which 
     expenses will be borne by the Selling Stockholders.

               The date of this Prospectus is January 9, 1998.

<PAGE>

                               AVAILABLE INFORMATION
                                           
     The Company is subject to the reporting requirements of the Securities 
Exchange Act of 1934, as amended (the "Exchange Act"), and in accordance 
therewith files periodic reports and other information with the Securities 
and Exchange Commission (the "Commission").  Such reports, proxy statements 
and other information concerning the Company may be inspected and copies may 
be obtained (at prescribed rates) at public reference facilities maintained 
by the Commission at Judiciary Plaza, 450 Fifth Street, N.W., Washington, 
D.C. 20549 and at the regional offices of the Commission located at Seven 
World Trade Center, 13th Floor, New York, New York 10048 and at Northwest 
Atrium Center, 500 W. Madison Street, Suite 1400, Chicago, Illinois  
60661-2511.  In addition, electronically filed documents, including reports, 
proxy and information statements and other information regarding the Company, 
can be obtained from the Commission's Web site at  http://www.sec.gov. The 
Company's Common Stock is listed on the Nasdaq National Market, and reports, 
proxy statements and other information concerning the Company can also be 
inspected the offices of the National Association of Securities Dealers, Inc. 
at 1735 K Street, Washington, D.C.  20006. 

     The Company has filed a Registration Statement on Form S-3 (the 
"Registration Statement") under the Securities Act with the Commission with 
respect to the Common Stock being offered pursuant to this Prospectus.  As 
permitted by the rules and regulations of the Commission, this Prospectus 
omits certain of the information contained in the Registration Statement.  
For further information with respect to the Company and the Common Stock 
being offered pursuant to this Prospectus, reference is hereby made to such 
Registration Statement, including the exhibits filed as part thereof.  
Statements contained in this Prospectus concerning the provisions of certain 
documents filed with, or incorporated by reference in, the Registration 
Statement are not necessarily complete, each such statement being qualified 
in all respects by such reference. Copies of all or any part of the 
Registration Statement, including the documents incorporated by reference 
therein or exhibits thereto, may be obtained upon payment of the prescribed 
rates at the offices of the Commission set forth above.

     Upon request, the Company will provide without charge to each person to 
whom a copy of this Prospectus has been delivered a copy of any information 
that was incorporated by reference in the Prospectus (other than exhibits to 
documents, unless such exhibits are specifically incorporated by reference 
into the Prospectus).  The Company will also provide upon specific request, 
without charge to each person to whom a copy of this Prospectus has been 
delivered, a copy of all documents filed from time to time by the Company 
with the Commission pursuant to the Exchange Act.  Requests for such copies 
should be directed to Thomas A. Shea, Chief Financial Officer, Cubist 
Pharmaceuticals, Inc. 24 Emily Street, Cambridge, MA  02141.  Telephone 
requests may be directed to Mr. Shea at (617) 576-4155.

                                      2

<PAGE>
                                           
                                    RISK FACTORS
                                           
     Prospective investors in the shares offered hereby should carefully 
consider the following risk factors, in addition to the other information 
appearing in this Prospectus.  This Prospectus contains and incorporates by 
reference forward-looking statements within the meaning of Section 27A of the 
Securities Act of 1933 and Section 21E of the Securities and Exchange Act of 
1934, including but not limited to (i) statements about the adequacy of the 
Company's cash, cash equivalents, other capital resources, interest income, 
other income and future revenues due under the Company's collaborative 
agreements to fund its operating expenses and capital requirements as 
currently planned through mid-1998, (ii) statements about the amount of 
capital expenditures that the Company expects to incur in 1998, (iii) 
statements about the Company's plans to begin clinical trials of daptomycin 
in late 1998, and (iv) certain statements identified or qualified by words 
such as "likely", "will", "suggests", "may", "would", "could", "should", 
"expects", "anticipates", "estimates", "plans", "projects", "believes", or 
similar expressions (and variants of such words or expressions).  Investors 
are cautioned that forward-looking statements are inherently uncertain.  
Actual performance and results of operations may differ materially from those 
projected or suggested in the forward looking statements due to certain risks 
and uncertainties including, but not limited to, the following risks and 
uncertainties and the risks and uncertainties described or discussed in the 
section "Risk Factors" in the Company's Annual Report on Form 10-K for the 
fiscal year ended December 31, 1996.  The forward-looking statements 
contained herein represent the Company's judgment as of the date of this 
Prospectus, and the Company cautions readers not to place undue reliance on 
such statements.

     Early Stage of Product Development; No Assurance of Successful 
Commercialization.   Since inception, the Company has generated no revenue 
from product sales. The Company's research and development programs are at an 
early stage, and the Company does not expect that any drugs resulting from 
its research and development efforts, or from the joint efforts of the 
Company and its collaborative partners, will be commercially available for a 
significant number of years, if at all. The Company has one drug candidate in 
preclinical development and is currently in the process of optimizing lead 
candidates to select other drug candidates for preclinical development.  To 
date, the Company has not, independently or with its collaborative partners, 
completed the optimization of any lead candidates.  Any drug candidates 
developed by the Company will require significant additional research and 
development efforts, including extensive preclinical (animal and in vitro 
data) and clinical testing and regulatory approval, prior to commercial sale. 
 Only one of the Company's drug candidates has advanced to any phase of 
preclinical or clinical trials. There can be no assurance that the Company's 
approach to drug discovery, acting independently or with the efforts of any 
collaborative partner of the Company, will be effective or will result in the 
development of any drug. The Company's drug candidates will be subject to the 
risks of failure inherent in the development of pharmaceutical products based 
on new technologies. These risks include the possibilities that any or all of 
the Company's drug candidates will be found to be unsafe, ineffective or 
toxic or otherwise fail to meet applicable regulatory standards or receive 
necessary regulatory clearances; that these drug candidates, if safe and 
effective, will be difficult to develop into commercially viable drugs or to 
manufacture on a large scale or will be uneconomical to market; that 
proprietary rights of third parties will preclude the Company from marketing 
such drugs; or that third parties will market superior or equivalent drugs. 
The failure to develop safe, commercially viable drugs would have a material 
adverse effect on the Company's business, operating results and financial 
condition. 

     Uncertainty Due to Unproven Technology.  The Company's drug discovery 
approach faces technical issues which have not been resolved and requires the 
development of multiple novel technologies to create a successful drug 
candidate. While the Company has demonstrated that certain compounds have the 
ability to inhibit the activity of certain molecular targets, the Company has 
not proven that this activity can be utilized clinically as a therapeutic. 
Furthermore, there can be no assurance that the inhibitory activity already 
demonstrated in primary screening will continue to be encouraging in further 
screening or drug discovery studies. The Company has not tested any drug 
candidates developed from the Company's drug discovery program in humans, and 
there can be no assurance that there will be clinical benefits associated 
with any such drug candidates.  Furthermore, there can be no assurance that 
the Company will successfully address these technological challenges or 
others that may arise in the course of development. Any failure of the 
Company to anticipate or respond adequately to technological developments 
will have a material adverse effect on the Company's business, operating 
results and financial condition.  There can be no assurance that the Company 
will be able to employ its drug discovery approach successfully. 

                                      3

<PAGE>

     Dependence on Collaborative Partners and Others.   A key element of the 
Company's strategy is to enhance certain of its drug discovery and 
development programs and to fund its capital requirements, in part, by 
entering into collaborative agreements with major pharmaceutical companies. 
The Company is a party to collaborative agreements with Bristol-Myers Squibb 
and Merck (collectively, the "Collaborative Agreements"). Under the 
Collaborative Agreements, each of Bristol-Myers Squibb and Merck is 
responsible for (i) providing libraries of compounds for screening against 
certain of the Company's aminoacyl-tRNA synthetase targets, (ii) selecting, 
in collaboration with Cubist, compounds determined to be leads in the 
screening for subsequent development, (iii) conducting preclinical and 
clinical trials and obtaining required regulatory approvals of drug 
candidates, and (iv) manufacturing and commercializing resulting drugs. As a 
result, the Company's receipt of revenues (whether in the form of continued 
research funding, drug development milestones or royalties on sales) under 
the Collaborative Agreements is dependent upon the decisions made by the 
manufacturing and marketing resources of its collaborative partners. The 
Company's collaborative partners are not obligated to develop or 
commercialize any drug candidates resulting from the Collaborative 
Agreements. The amount and timing of resources dedicated by the Company's 
collaborative partners to their respective collaborations with the Company is 
not within the Company's control. Moreover, certain drug candidates 
discovered by the Company may be viewed by the Company's collaborative 
partners as competitive with such partners' drugs or drug candidates. 
Accordingly, there can be no assurance that the Company's collaborative 
partners will elect to proceed with the development of drug candidates which 
the Company believes to be promising or that they will not pursue their 
existing or alternative technologies in preference to such drug candidates. 
There can be no assurance that the interests of the Company will continue to 
coincide with those of its collaborative partners, that some of the Company's 
collaborative partners will not develop independently, or with third parties, 
drugs that could compete with drugs of the types contemplated by the 
Collaborative Agreements, or that disagreements over rights or technology or 
other proprietary interests will not occur. 

     If any of the Company's collaborative partners breaches or terminates 
its agreement with the Company, or otherwise fails to conduct its 
collaborative activities in a timely manner, the development or 
commercialization of any drug candidate or research program under these 
Collaborative Agreements may be delayed, the Company may be required to 
undertake unforeseen additional responsibilities or to devote unforeseen 
additional resources to such development or commercialization, or such 
development or commercialization could be terminated. Any such event could 
materially adversely affect the Company's financial condition, intellectual 
property position and operations. In addition, there have been a significant 
number of recent consolidations among pharmaceutical companies. Such 
consolidations among the companies with which the Company is collaborating 
could result in the diminution or termination of, or delays in, the 
development or commercialization of drug candidates or research programs 
under one or more of the Collaborative Agreements. 

     Additional Financing Requirements; Uncertainty of Available Funding.   
The Company will require substantial additional funds for its drug discovery 
and development programs, for operating expenses, for pursuing regulatory 
clearances, for the development of manufacturing, marketing and sales 
capabilities and for prosecuting and defending its intellectual property 
rights before it can expect to realize significant revenues from commercial 
sales. The Company intends to seek such additional funding through public or 
private financing or collaborative or other arrangements with corporate 
partners. If additional funds are raised by issuing equity securities, 
further dilution to existing stockholders may result and future investors may 
be granted rights superior to those of existing stockholders. There can be no 
assurance, however, that additional financing will be available from any of 
these sources or, if available, will be available on acceptable or affordable 
terms. If adequate funds are not available, the Company may be required to 
delay, reduce the scope of or eliminate one or more of its research and 
development programs or to obtain funds by entering into arrangements with 
collaborative partners or others that require the Company to issue additional 
equity securities or to relinquish rights to certain technologies or drug 
candidates that the Company would not otherwise issue or relinquish in order 
to continue independent operations. See "Management's Discussion and Analysis 
of Financial Condition and Results of Operations." 

     History of Losses and Expectation of Future Losses; Uncertainty of 
Future Profitability.  The Company has incurred a cumulative operating loss 
of approximately $20.3 million through September 30, 1997. Losses have 
resulted principally from costs incurred in research and development 
activities related to the Company's efforts to develop target assays, 
acquisition and chemical optimization of compounds, automated high throughput 
screening 

                                      4

<PAGE>

and from the associated administrative costs. The Company expects to incur 
significant additional operating losses over the next several years and 
expects cumulative losses to increase substantially due to expanded research 
and development efforts, preclinical and clinical trials and development of 
manufacturing, marketing and sales capabilities. In the next few years, the 
Company's revenues may be limited to research support payments under the 
Collaborative Agreements and any amounts received under other research or 
drug development collaborations that the Company has established or will 
establish. There can be no assurance, however, that the Company will be able 
to establish any additional collaborative relationships on terms acceptable 
to the Company or maintain in effect the current Collaborative Agreements. 
The Company's ability to achieve significant revenue or profitability is 
dependent on its or its collaborative partners' ability to successfully 
complete the development of drug candidates, to develop and obtain patent 
protection and regulatory approvals for the drug candidates and to 
manufacture and commercialize the resulting drugs. The Company will not 
receive revenues or royalties from commercial sales for a significant number 
of years, if at all. Failure to receive significant revenues or achieve 
profitable operations would impair the Company's ability to sustain 
operations. There can be no assurance that the Company will ever successfully 
develop, commercialize, patent, manufacture and market any products, obtain 
required regulatory approvals or achieve profitability. See "Management's 
Discussion and Analysis of Financial Condition and Results of Operations." 

     Uncertainty of Patents and Proprietary Rights.  The Company's success 
will depend in part on its ability to obtain U.S. and foreign patent 
protection for its drug candidates and processes, preserve its trade secrets 
and operate without infringing the proprietary rights of third parties. 
Because of the length of time and expense associated with bringing new drug 
candidates through the development and regulatory approval process to the 
marketplace, the pharmaceutical industry has traditionally placed 
considerable importance on obtaining patent and trade secret protection for 
significant new technologies, products and processes. There can be no 
assurance that any additional patents will issue from any of the patent 
applications owned by, or licensed to, the Company. Further, there can be no 
assurance that any rights the Company may have under issued patents will 
provide the Company with significant protection against competitive products 
or otherwise be commercially viable. Legal standards relating to the validity 
of patents covering pharmaceutical and biotechnological inventions and the 
scope of claims made under such patents are still developing. There is no 
consistent policy regarding the breadth of claims allowed in biotechnology 
patents. The patent position of a biotechnology firm is highly uncertain and 
involves complex legal and factual questions. There can be no assurance that 
any existing or future patents issued to, or licensed by, the Company will 
not subsequently be challenged, infringed upon, invalidated or circumvented 
by others. In addition, patents may have been granted, or may be granted, 
covering products or processes that are necessary or useful to the 
development of the Company's drug candidates. If the Company's drug 
candidates or processes are found to infringe upon the patents, or otherwise 
impermissibly utilize the intellectual property of others, the Company's 
development, manufacture and sale of such drug candidates could be severely 
restricted or prohibited. In such event, the Company may be required to 
obtain licenses from third parties to utilize the patents or proprietary 
rights of others. There can be no assurance that the Company will be able to 
obtain such licenses on acceptable terms, or at all. There has been 
significant litigation in the industry regarding patents and other 
proprietary rights. If the Company becomes involved in litigation regarding 
its intellectual property rights or the intellectual property rights of 
others, the potential cost of such litigation and the potential damages that 
the Company could be required to pay could be substantial. 

     In addition to patent protection, the Company relies on trade secrets, 
proprietary know-how and technological advances which it seeks to protect, in 
part, by confidentiality agreements with its collaborative partners, 
employees and consultants. There can be no assurance that these 
confidentiality agreements will not be breached, that the Company would have 
adequate remedies for any such breach, or that the Company's trade secrets, 
proprietary know-how and technological advances will not otherwise become 
known or be independently discovered by others.

     Uncertainty Associated with Preclinical and Clinical Testing.  Before 
obtaining regulatory approvals for the commercial sale of any of the 
Company's potential drugs, the drug candidates will be subject to extensive 
preclinical and clinical trials to demonstrate their safety and efficacy in 
humans. The Company is dependent on its collaborative partners to conduct 
clinical trials for the drug candidates resulting from the Collaborative 
Agreements and may become dependent on other third parties to conduct future 
clinical trials of its internally developed drug 

                                      5

<PAGE>


candidates. The Company has no experience in conducting preclinical or 
clinical trials, and preclinical or clinical trials have been commenced with 
respect to only one of the Company's drug candidates and none of the drug 
candidates being developed jointly by the Company and its collaborative 
partners. Furthermore, there can be no assurance that preclinical or clinical 
trials of any drug candidates will demonstrate the safety and efficacy of 
such drug candidates at all or to the extent necessary to obtain regulatory 
approvals. Companies in the biotechnology industry have suffered significant 
setbacks in advanced clinical trials, even after demonstrating promising 
results in earlier trials. The failure to adequately demonstrate the safety 
and efficacy of a drug candidate under development could delay or prevent 
regulatory approval of the drug candidate and would have a material adverse 
effect on the Company's business, operating results and financial condition. 

     No Assurance of Market Acceptance.  There can be no assurance that any 
drugs successfully developed by the Company, independently or with its 
collaborative partners, if approved for marketing, will achieve market 
acceptance. The antiinfective drugs which the Company is attempting to 
develop will compete with a number of well-established antiinfective drugs 
manufactured and marketed by major pharmaceutical companies. The degree of 
market acceptance of any drugs developed by the Company will depend on a 
number of factors, including the establishment and demonstration of the 
clinical efficacy and safety of the Company's drug candidates, their 
potential advantage over existing therapies and reimbursement policies of 
government and third-party payors. There is no assurance that physicians, 
patients or the medical community in general will accept and utilize any 
drugs that may be developed by the Company independently or with its 
collaborative partners. 

     Intense Competition.  The biotechnology and pharmaceutical industries 
are intensely competitive and subject to rapid and significant technological 
change. Competitors of the Company in the United States and elsewhere are 
numerous and include, among others, major multinational pharmaceutical and 
chemical companies, specialized biotechnology firms and universities and 
other research institutions. Many of these competitors employ greater 
financial and other resources, including larger research and development 
staffs and more effective marketing and manufacturing organizations, than the 
Company or its collaborative partners. Acquisitions of competing companies 
and potential competitors by large pharmaceutical companies or others could 
enhance financial, marketing and other resources available to such 
competitors. As a result of academic and government institutions becoming 
increasingly aware of the commercial value of their research findings, such 
institutions are more likely to enter into exclusive licensing agreements 
with commercial enterprises, including competitors of the Company, to market 
commercial products. There can be no assurance that the Company's competitors 
will not succeed in developing technologies and drugs that are more effective 
or less costly than any which are being developed by the Company or which 
would render the Company's technology and future drugs obsolete and 
noncompetitive. 

     In addition, some of the Company's competitors have greater experience 
than the Company in conducting preclinical trials and obtaining U.S. Food and 
Drug Administration ("FDA") and other regulatory approvals. Accordingly, the 
Company's competitors may succeed in obtaining FDA or other regulatory 
approvals for drug candidates more rapidly than the Company. Companies that 
complete clinical trails, obtain required regulatory agency approvals and 
commence commercial sale of their drugs before their competitors may achieve 
a significant competitive advantage, including certain patent and FDA 
marketing exclusivity rights that would delay the Company's ability to market 
certain products. There can be no assurance that drugs resulting from the 
Company's research and development efforts, or from the joint efforts of the 
Company and its collaborative partners, will be able to compete successfully 
with competitors' existing products or products under development or that 
they will obtain regulatory approval in the United States or elsewhere. 

     Impact of Extensive Government Regulation.  The FDA and comparable 
agencies in foreign countries impose substantial requirements upon the 
introduction of pharmaceutical products through lengthy and detailed 
preclinical, laboratory and clinical testing procedures, sampling activities 
and other costly and time-consuming procedures to establish their safety and 
efficacy. All of the Company's drug candidates will require governmental 
approvals for commercialization, none of which have been obtained.  
Preclinical and clinical trials and manufacturing of the Company's drug 
candidates will be subject to the rigorous testing and approval processes of 
the FDA and corresponding foreign regulatory authorities. Satisfaction of 
these requirements typically take a significant number of years and can vary 
substantially based upon the type, complexity and novelty of the product. 
There can be no assurance as to when Cubist, independently or with its 
collaborative partners, might first submit an 

                                      6

<PAGE>


IND for FDA or other regulatory review. Government regulation also affects 
the manufacturing and marketing of pharmaceutical products.

     The effect of government regulation may be to delay marketing of the 
Company's potential drugs for a considerable or indefinite period of time, 
impose costly procedural requirements upon the Company's activities and 
furnish a competitive advantage to larger companies or companies more 
experienced in regulatory affairs. Delays in obtaining governmental 
regulatory approval could adversely affect the Company's marketing as well as 
the Company's ability to generate significant revenues from commercial sales. 
There can be no assurance that FDA or other regulatory approvals for any drug 
candidates developed by the Company will be granted on a timely basis or at 
all. Moreover, if regulatory approval of a drug candidate is granted, such 
approval may impose limitations on the indicated use for which such drug may 
be marketed. Even if initial regulatory approvals for the Company's drug 
candidates are obtained, the Company, its drugs and its manufacturing 
facilities would be subject to continual review and periodic inspection, and 
later discovery of previously unknown problems with a drug, manufacturer or 
facility may result in restrictions on such drug or manufacturer, including 
withdrawal of the drug from the market. The regulatory standards are applied 
stringently by the FDA and other regulatory authorities and failure to comply 
can, among other things, result in fines, denial or withdrawal of regulatory 
approvals, product recalls or seizures, operating restrictions and criminal 
prosecution. 

     The FDA has developed two "fast track" policies for certain new drugs 
(including antibiotics), one policy for expedited development and review and 
one policy for accelerated approval. The expedited development and review 
policy applies to new drug therapies that are intended to treat persons with 
life-threatening and severely debilitating illnesses, especially where no 
satisfactory alternative therapy exists. The accelerated approval policy 
applies to certain new drugs that are intended to treat persons with serious 
or life-threatening illnesses that provide a meaningful therapeutic benefit 
to patients over existing treatments.  There can be no assurance that any 
drug candidate contemplated by the Company will qualify for the FDA's various 
fast track or priority approval policies. Nor can there be any assurance that 
such policies will remain as currently implemented by the FDA. 

     As with many biotechnology and pharmaceutical companies, the Company is 
subject to numerous environmental and safety laws and regulations. Any 
violation of, and the cost of compliance with, these regulations could 
materially adversely affect the Company's business, operating results and 
financial condition. The Company is subject to periodic inspections and has 
not received notice of any material violations of any environmental or safety 
law or regulation. 

     Dependence on Key Personnel.  The Company is highly dependent upon the 
efforts of its senior management and scientific team, including its President 
and Chief Executive Officer. Although Dr. Rocklage has entered into an 
employment agreement with the Company, the terms of the employment agreement 
provide that Dr. Rocklage may terminate his employment with the Company at 
any time upon thirty days' written notice. None of the Company's other 
executive officers or key employees has entered into an employment agreement 
with the Company. The loss of the services of one or more of these 
individuals might impede the achievement of the Company's development 
objectives. Because of the specialized scientific nature of the Company's 
business, the Company is highly dependent upon its ability to attract and 
retain qualified scientific and technical personnel. There is intense 
competition among major pharmaceutical and chemical companies, specialized 
biotechnology firms and universities and other research institutions for 
qualified personnel in the areas of the Company's activities. There can be no 
assurance that the Company will be able to continue to attract and retain the 
qualified personnel necessary for the development of its business. Loss of 
the services of, or failure to recruit, key scientific and technical 
personnel could adversely affect the Company's business, operating results 
and financial condition. 

     Lack of Manufacturing, Marketing and Sales Capability and Experience.  
Cubist has not yet invested in the development of manufacturing, marketing or 
sales capabilities. The Company has no experience in, and currently lacks the 
facilities and personnel to, manufacture products in accordance with Good 
Manufacturing Practices ("GMP") as prescribed by the FDA or to produce an 
adequate supply of compounds to meet future requirements for clinical trials. 
If the Company is unable to develop or contract for manufacturing 
capabilities on acceptable terms, the Company's ability to conduct 
preclinical and clinical trials with the Company's drug candidates will be 
adversely affected, resulting in delays in the submission of drug candidates 
for regulatory approvals and in the initiation of 

                                      7

<PAGE>

new development programs, which in turn could materially impair Cubist's 
competitive position and the possibility of achieving profitability. 

     The Company has no experience in marketing drugs. The Company has 
granted marketing rights to its collaborative partners with respect to drugs 
developed through the Collaborative Agreements. The Company may seek to 
collaborate with a third party to market those drugs for which it has 
retained or licensed marketing rights or may seek to market and sell such 
drugs directly. If the Company seeks to collaborate with a third party, there 
can be no assurance that a collaborative agreement can be reached on 
acceptable terms. If the Company seeks to market and sell such drugs 
directly, the Company will need to hire additional personnel skilled in 
marketing and sales as it develops drugs with commercial potential. There can 
be no assurance that the Company will be able to acquire, or establish 
third-party relationships to provide, any or all of these capabilities. 

     Reimbursement and Drug Pricing Uncertainty.  The successful 
commercialization of, and the interest of potential collaborative partners to 
invest in, the development of the Company's drug candidates will depend 
substantially on reimbursement of the costs of the resulting drugs and 
related treatments at acceptable levels from government authorities, private 
health insurers and other organizations, such as health maintenance 
organizations ("HMOs"). There can be no assurance that reimbursement in the 
United States or elsewhere will be available for any drugs the Company may 
develop or, if available, will not be decreased in the future, or that 
reimbursement amounts will not reduce the demand for, or the price of, the 
Company's drugs, thereby adversely affecting the Company's business. If 
reimbursement is not available or is available only to limited levels, there 
can be no assurance that the Company will be able to obtain collaborative 
partners to manufacture and commercialize drugs, or would be able to obtain a 
sufficient financial return on its own manufacture and commercialization of 
any future drugs. 

     Third-party payors are increasingly challenging the prices charged for 
medical products and services. Also, the trend toward managed health care in 
the United States and the concurrent growth of organizations such as HMOs, 
which can control or significantly influence the purchase of health care 
services and products, as well as legislative proposals to reform health care 
or reduce government insurance programs, may result in lower prices for 
pharmaceutical products. The cost containment measures that health care 
providers are instituting, including practice protocols and guidelines and 
clinical pathways, and the effect of any health care reform, could materially 
adversely affect the Company's ability to sell any of its drugs if 
successfully developed and approved. Moreover, the Company is unable to 
predict what additional legislation or regulation, if any, relating to the 
health care industry or third-party coverage and reimbursement may be enacted 
in the future or what effect such legislation or regulation would have on the 
Company's business. 

     Potential Product Liability and Availability of Insurance.  The 
Company's business exposes it to potential liability risks that are inherent 
in the testing, manufacturing and marketing of pharmaceutical products. The 
use of the Company's drug candidates in clinical trials may expose the 
Company to product liability claims and possible adverse publicity. These 
risks will expand with respect to the Company's drug candidates, if any, that 
receive regulatory approval for commercial sale. Product liability insurance 
for the biotechnology industry is generally expensive, if available at all. 
The Company does not have product liability insurance but intends to obtain 
such coverage if and when its drug candidates are tested in clinical trials. 
However, such coverage is becoming increasingly expensive and there can be no 
assurance that the Company will be able to obtain insurance coverage at 
acceptable costs or in a sufficient amount, if at all, or that a product 
liability claim would not adversely affect the Company's business, operating 
results or financial condition. 

     Control by Existing Stockholders.  The Company's officers, directors and 
principal stockholders and their affiliates will own or control approximately 
69.0% of the Company's outstanding Common Stock. As a result, these 
stockholders, acting together, will have the ability to control most matters 
requiring approval by the stockholders of the Company, including the election 
of the Company's Board of Directors. 

     Potential Anti-Takeover Effect of Certain Charter and By-Law Provisions. 
Pursuant to the Company's Restated Certificate of Incorporation (the 
"Restated Certificate of Incorporation"), special meetings of stockholders 
may be called only by the Chairman of the Board, the President or a majority 
of the Board of Directors of the Company. In addition, the Restated 
Certificate of Incorporation authorizes the Board of Directors to issue 
preferred 

                                      8

<PAGE>


stock and to determine its rights and preferences in order to eliminate 
delays associated with a stockholder vote on specific issuances. The Company 
has no present plans to issue any shares of preferred stock. The Restated 
Certificate of Incorporation also provides for staggered elections of the 
Company's Board of Directors and specific procedures for director nominations 
by stockholders and submission of other proposals for consideration at 
stockholder meetings. These provisions may have the effect of deterring 
hostile takeovers or delaying or preventing changes in control or management 
of the Company, including transactions in which stockholders might otherwise 
receive a premium for their shares over then-current market prices. Certain 
provisions of Delaware law applicable to the Company could also delay or make 
more difficult a merger, tender offer or proxy contest involving the Company, 
including Section 203 of the Delaware General Corporation Law (the "DGCL"), 
which prohibits a Delaware corporation from engaging in any business 
combination with any stockholder owning 15% or more of Company's outstanding 
voting stock ("interested stockholder") for a period of three years from the 
date a stockholder becomes an interested stockholder unless certain 
conditions are met. These provisions could also limit the price that 
investors might be willing to pay in the future for shares of Common Stock. 

     Absence of Dividends.  The Company has never declared or paid cash 
dividends and does not intend to declare or pay any cash dividends in the 
foreseeable future.

                                      9

<PAGE>
                                     THE COMPANY 
                                           
     Cubist Pharmaceuticals, Inc. ("Cubist" or the "Company") is a 
biopharmaceutical company engaged in the research, development and 
commercialization of novel antiinfective drugs to treat infectious diseases 
caused by bacteria and fungi, primarily those resistant to existing 
antiinfective drugs. The mailing address and telephone number of the 
Company's principal executive office is 24 Emily Street, Cambridge, MA  02139 
 (617) 576-1999. 

                                 RECENT DEVELOPMENTS
                                           
     On November 7, 1997, the Company entered into a license agreement with 
Eli Lilly and Company ("Eli Lilly") pursuant to which the Company acquired 
exclusive worldwide rights to develop, manufacture and market daptomycin.  
Daptomycin is a novel, natural product being developed by the Company in 
oral, topical, aerosol and intravenous formulations for the treatment of 
Staphylococcus aureus and enterococcal infections.  Subject to meetings with 
the U.S. Food and Drug Administration and the successful manufacture of 
daptomycin, the Company anticipates that it will begin clinical trials of 
daptomycin in late 1998.  In exchange for such license, the Company has 
agreed to pay an upfront license fee in cash and, if certain drug development 
milestones are achieved, to pay milestone payments by issuing shares of 
Common Stock to Eli Lilly.  In addition, the Company will be required to pay 
royalties to Eli Lilly on worldwide sales of daptomycin.
                                           
                                   USE OF PROCEEDS
                                           
     The Company will not receive any proceeds from the sale of the shares of
Common Stock offered hereby by the Selling Stockholders. 

                                      10


<PAGE>

                                 SELLING STOCKHOLDERS
                                                                      
     The following table sets forth certain information regarding the 
beneficial ownership of the Company's Common Stock as of December 31, 1997, 
by each of the Selling Stockholders. The information provided in the table 
below with respect to each Selling Stockholder has been obtained from such 
Selling Stockholder. Except as otherwise disclosed below, none of the Selling 
Stockholders 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. Because the Selling Stockholders may sell all or 
some portion of the shares of Common Stock beneficially owned by them, no 
estimate can be given as to the number of shares of Common Stock that will be 
beneficially owned by the Selling Stockholders after the consummation of this 
offering. In addition, the Selling Stockholders may have sold, transferred or 
otherwise disposed of, or may sell, transfer or otherwise dispose of, at any 
time or from time to time since the date on which they provided to the 
Company the information regarding the shares of Common Stock beneficially 
owned by them, all or a portion of the shares of Common Stock beneficially 
owned by them in transactions exempt from the registration requirements of 
the Securities Act. 

<TABLE>
<CAPTION>

Name and Address of Beneficial Owner                Shares                    Number                    Shares
- ------------------------------------          Beneficially Owned            of Shares             Beneficially Owned
                                             Prior to Offering (1)        Being Offered            After Offering(1)
                                             ---------------------        -------------           ------------------

                                                    Number                                          Number  Percent
                                                    ------                                          ------  -------
<S>                                               <C>                     <C>                       <C>       <C>
International Biotechnology Trust plc.........    1,116,327               816,327                   300,000   2.8%
 Five Arrows House
 St. Swithin's Lane
 London EC4N 8NR
 ENGLAND

Entities affiliated with
H&Q Capital Management(2).....................      918,738               163,267                   428,571   4.0%
 50 Rowes Wharf
 Boston, MA 02110

Paul R. Schimmel(3)..........................       297,539               285,713                    11,826      *
</TABLE>

___________
*    Less than 1% of the oustanding shares of Common Stock.

(1)  Beneficial ownership is determined in accordance with Rule 13d-3(d) 
     promulgated by the Commission under the Securities and Exchange Act of 
     1934, as amended. Shares of Common Stock issuable pursuant to options, 
     warrants and convertible securities, to the extent such securities are 
     currently exercisable or convertible within 60 days of December 31, 1997,
     are treated as outstanding for computing the percentage of the person 
     holding such securities but are not treated as outstanding for computing 
     the percentage of any other person. Unless otherwise noted, each person 
     or group identified possesses sole voting and investment power with 
     respect to shares, subject to community property laws where applicable. 
     Shares not outstanding but deemed beneficially owned by virtue of the 
     right of a person or group to acquire them within 60 days are treated as 
     outstanding only for purposes of determining the number of and percent 
     owned by such person or group. 

(2)  Consists of 528,055 shares held by H&Q Healthcare Investors and 390,683 
     shares held by H&Q Life Sciences Investors. H&Q Capital Management, Inc.
     is the general partner of H&Q Healthcare Investors and H&Q Life Sciences 
     Investors and as such H&Q Capital Management, Inc. shares voting and 
     investment power with respect to the shares owned by H&Q Healthcare 
     Investors and H&Q Life Sciences Investors. H&Q Capital Management, Inc. 
     may be deemed to beneficially own all of the shares owned by H&Q 
     Healthcare Investors and H&Q Life Sciences Investors although H&Q Capital
     Management, Inc. disclaims beneficial ownership except to the extent of 
     its proportionate partnership interest in each of H&Q Healthcare 
     Investors and H&Q Life Sciences Investors. 

(3)  Includes 11,826 shares of Common Stock which Dr. Schimmel has the right 
     to acquire within 60 days of December 31, 1997 upon the exercise of stock
     options, and 65,714 shares held by the Paul R. Schimmel Profit-Sharing 
     Plan.  Dr. Schimmel is a director of the Company.

                                      11

<PAGE>

                                 PLAN OF DISTRIBUTION
                                           
     The Company has been advised by the Selling Stockholders that the shares 
of Common Stock offered hereby may be sold from time to time to purchasers 
directly by the Selling Stockholders. Alternatively, the Selling Stockholders 
may from time to time offer any or all of the shares of Common Stock offered 
hereby to or through underwriters, broker/dealers or agents, who may receive 
compensation in the form of underwriting discounts, concessions or 
commissions from the Selling Stockholders or the purchasers of such shares of 
Common Stock for whom they may act as agents. The Selling Stockholders and 
any underwriters, broker/dealers or agents that participate in the 
distribution of the shares of Common Stock offered hereby may be deemed to be 
"underwriters" within the meaning of the Securities Act and any profit 
realized by them on the sale of such shares of Common Stock and any 
discounts, commissions, concessions or other compensation received by any 
such underwriter, broker/dealer or agent may be deemed to be underwriting 
discounts and commissions under the Securities Act. 

     The Company has been advised by the Selling Stockholders that the shares 
of Common Stock offered hereby may be sold from time to time in one or more 
transactions at fixed prices, at market prices prevailing at the time of 
sale, at varying prices determined at the time of sale or at negotiated 
prices. The sale of the shares of Common Stock offered hereby may be effected 
in transactions (which may involve crosses or block transactions) (i) on any 
national securities exchange or quotation service on which the Common Stock 
may be listed or quoted at the time of sale, (ii) in the over-the-counter 
market, (iii) in transactions otherwise than on such exchanges or in the 
over-the-counter market or (iv) through the writing of options. At the time a 
particular offering of any of the shares of Common Stock offered hereby is 
made, a supplement to this Prospectus, if required, will be distributed which 
will set forth the aggregate number of shares of Common Stock being offered 
and the terms of such offering, including the name or names of any 
underwriters, broker/dealers or agents, any discounts, commissions and other 
terms constituting compensation from the Selling Stockholders and any 
discounts, commissions or concessions allowed or reallowed to be paid to 
broker/dealers. 

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

     Under applicable rules and regulations of the Exchange Act, any person 
engaged in a distribution of any of the shares of Common Stock offered hereby 
may not simultaneously engage in market-making activities with respect to the 
Common Stock of the Company for a period of nine business days prior to the 
commencement of such distribution. In addition to and without limiting the 
foregoing, each Selling Stockholder and any other person participating in a 
distribution will be subject to applicable provisions of the Exchange Act and 
the rules and regulations thereunder, including without limitation Rules 
10b-6 and 10b-7, which provisions may limit the timing of purchases and sales 
of any shares of Common Stock of the Company by the Selling Stockholders or 
any such other person. All of the foregoing may affect the marketability of 
the Common Stock of the Company and the ability of brokers or dealers to 
engage in market-making activities with respect to the Common Stock of the 
Company. 

     Pursuant to the agreements with the Selling Stockholders, all expenses 
of the registration of the Securities will be paid by the Company, including 
without limitation, Commission filing fees and expenses of compliance with 
state securities or "blue sky" laws; provided, however, that the Selling 
Stockholders will pay all underwriting discounts and selling commissions, if 
any. The Selling Stockholders will be indemnified by the Company against 
certain civil liabilities, including certain liabilities under the Securities 
Act, or will be entitled to contribution in connection therewith. The Company 
will be indemnified by the Selling Stockholders against certain civil 
liabilities, including certain liabilities under the Securities Act, or will 
be entitled to contribution in connection therewith.

                                      12

<PAGE>

                                    LEGAL MATTERS
                                           
     Bingham Dana LLP, Boston, Massachusetts will opine that the Shares offered
hereby have been validly issued and are fully paid and non-assessable. Justin
P. Morreale, a partner at Bingham Dana LLP, is the Secretary of the Company 
and owns a total of 42,857 shares of Common Stock of the Company. Other 
partners and associates at Bingham Dana LLP own a total of 6,982 shares of 
Common Stock of the Company. 

                                       EXPERTS
                                           
     The balance sheets of the Company as of December 31, 1995 and 1996 and 
the related statements of operations, changes in stockholders' equity and 
cash flows for each of the three years in the period ended December 31, 1996 
incorporated by reference in this Prospectus and in this Registration 
Statement have been incorporated herein in reliance on the report of Coopers 
& Lybrand L.L.P., independent accountants, given upon the authority of that 
firm as experts in accounting and auditing. 

                  INCORPORATION OF CERTAIN INFORMATION BY REFERENCE
                                           
     There is incorporated herein by reference the Annual Report on Form 10-K 
of the Company for the fiscal year ended December 31, 1996 and the Quarterly 
Reports on Form 10-Q of the Company for the fiscal quarters ended March 31, 
1997, June 30, 1997 and September 30, 1997, filed with the Commission 
pursuant to Section 13(a) of the Exchange Act, and the description of the 
Common Stock contained in the Company's Registration Statement filed with the 
Commission under to Section 12(g) of the Exchange Act including any amendment 
or report filed for the purpose of updating such description.

     All documents filed by the Company pursuant to Sections 13(a), 13(c), 14 
or 15(d) of the Exchange Act subsequent to the date of this Prospectus and 
prior to the termination of the offering of the Common Stock shall be deemed 
to be incorporated by reference in this Prospectus and to be a part hereof 
from the date of filing such documents.  Any statement contained herein or in 
a document, all or a portion of which is 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 or portion 
thereof 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.

                                      13

<PAGE>

No dealer, sales person, or any other person has been authorized to give any 
information or to make any representations not contained in this Prospectus 
in connection with any offering other made hereby, 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 any 
securities other than the shares of Common Stock to which it relates or an 
offer to, or a solicitation of, any person in any jurisdiction where such an 
offer or solicitation would be unlawful.  Neither the delivery of this 
Prospectus nor any sale made hereunder shall, under any circumstances, create 
an implication that there has been no change in the affairs of the Company 
since the date hereof or that information contained herein is correct as of 
any time subsequent to the date hereof.  

                                   1,265,307 Shares
                                           
                                           
                                           
                                           
                                           
                                           
                                           
                             Cubist Pharmaceuticals, Inc.
                                           
                                           
                                     Common Stock
                                           
                                           
                                           
                                           
                                    ---------------
                                           
                                      PROSPECTUS
                                           
                                    January 9, 1998
                                           
                                    ---------------

                                           
<PAGE>
                                       PART II
                      INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14. Other Expenses of Issuance and Distribution

     The expenses in connection with the issuance and distribution of the 
securities being registered are set forth in the following table (all amounts 
except the registration fee and the listing fee are estimated): 

<TABLE>
<S>                                                                                     <C>
SEC Registration Fee................................................................... $ 1,989.02
Nasdaq National Market Listing Fees....................................................  17,500.00
Legal Fees and Expenses................................................................  10,000.00
Accountants' Fees and Expenses.........................................................   5,000.00
Expenses of Qualification Under State Securities Laws, Including Attorneys' Fees.......   2,000.00
Miscellaneous Costs....................................................................   8,000.98
                                                                                        ----------
          Total........................................................................ $44,490.00
</TABLE>

     All expenses in connection with the issuance and distribution of the 
securities being offered shall be borne by the Company. 

Item 15. Indemnification of Directors and Officers

     Section 145 of the Delaware General Corporation Law empowers a Delaware 
corporation to indemnify its officers and directors and certain other persons 
to the extent and under the circumstances set forth therein. 

     The Restated Certificate of Incorporation and the Amended and Restated 
By-Laws of the Company, copies of which are filed herein as Exhibit 3.3 and 
3.4, provide for advancement of expenses and indemnification of officers and 
directors of the Registrant and certain other persons against liabilities and 
expenses incurred by any of them in certain stated proceedings and under 
certain stated conditions to the fullest extent permissible under Delaware 
law. 

     The Amended and Restated Shareholders Rights Agreement, filed as Exhibit 
4.2 hereto, the Registration Rights Agreement, dated as of July 18, 1997, 
filed as Exhibit 4.3 hereto, and the Registration Rights Agreement, dated as 
of July 18, 1997, filed as Exhibit 4.4 hereto, provide for indemnification by 
the Registrant of each of the Selling Stockholders against certain 
liabilities under the Securities Act, the Securities Exchange Act, state 
securities laws or otherwise, and provides for indemnification by the Selling 
Stockholders of the Registrant and its directors, its officers and certain 
control persons against certain liabilities under the Securities Act, the 
Securities Exchange Act, state securities laws or otherwise.

Item 16. Exhibits

Exhibits
     
  *3.3    Restated Certificate of Incorporation of the Registrant.
  *3.4    Amended and Restated By-Laws of the Registrant, as amended to date.
  *4.1    Specimen certificate for shares of Common Stock.
  *4.2    Shareholders Rights Agreement among the Registrant and the 
          shareholders listed on Exhibit A thereto.
 **4.3    Registration Rights Agreement, dated as of July 18, 1997, between 
          the Registrant and International Biotechnology Trust plc.
 **4.4    Registration Rights Agreement, dated as of July 18, 1997, among the
          Registrant, H&Q Healthcare Investors and H&Q Life Science Investors.
 **5.1    Opinion of Bingham Dana LLP

                                      II-1

<PAGE>

**23.1    Consent of Bingham Dana LLP (included in Exhibit 5.1)
  23.2    Consent of Coopers & Lybrand L.L.P.

___________

*    Incorporated by reference from the Registrant's Registration Statement on
     Form S-1 (Registration No. 333-6795). 
**   Previously filed. 


Item 17. Undertakings

     The undersigned registrant hereby undertakes: 

     (1) To file, during any period in which offers or sales are being made 
         pursuant to this Registration Statement, 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. 

     (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. 

     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 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 therein, and the offering of such 
securities at that time shall be deemed to be the initial bona fide offering 
thereof.

     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 described in Item 15 
above, 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 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.

                                      II-2

<PAGE>

                                      SIGNATURES

     Pursuant to the requirements of the Securities Act of 1933, as amended, 
the registrant, Cubist Pharmaceuticals, Inc., certifies that it has 
reasonable grounds to believe that it meets all of the requirements for 
filing on Form S-3 and has duly caused this registration statement to be 
signed on its behalf by the undersigned, thereunto duly authorized, in the 
City of Cambridge, Commonwealth of Massachusetts, on this 9th day of January, 
1998. 


                                    Cubist Pharmaceuticals, Inc.
     
  
                                    By:
                                        /s/ Scott M. Rocklage    
                                        -------------------------
                                        Scott M. Rocklage        
                                        President and Chief Executive Officer


     Pursuant to the requirements of the Securities Act of 1933, this 
Registration Statement has been signed below by the following persons in the 
capacities and on the dates indicated:

<TABLE>
<CAPTION>
           Signature                            Title                                         Date

<S>                             <C>                                                     <C>
/s/ Scott M. Rocklage           President, Chief Executive Officer and Director         January 9, 1998
- -------------------------       (Principal Executive Officer)
Scott M. Rocklage               

/s/ Thomas A. Shea              Treasurer (Principal Financial and                      January 9, 1998
- -------------------------       Accounting Officer)
Thomas A. Shea

             *                  Chairman of the Board of Directors                      January 9, 1998
- -------------------------       
John K. Clarke

             *                  Director                                                January 9, 1998
- -------------------------        
Barry Bloom

             *                  Director                                                January 9, 1998
- -------------------------        
George Conrades

             *                  Director                                                January 9, 1998
- -------------------------        
Ellen M. Feeney

             *                  Director                                                January 9, 1998
- -------------------------        
David Martin

             *                  Director                                                January 9, 1998
- -------------------------        
Terrance G. McGuire

             *                  Director                                                January 9, 1998
- -------------------------        
Julius Rebek, Jr.

             *                  Director                                                January 9, 1998
- -------------------------        
Paul R. Schimmel

*By: /s/ Thomas A. Shea
- -------------------------
     Thomas A. Shea,
    Attorney-in-Fact
</TABLE>

                                      II-3

<PAGE>

                                  EXHIBIT INDEX

Exhibits
     
  *3.3    Restated Certificate of Incorporation of the Registrant.
  *3.4    Amended and Restated By-Laws of the Registrant, as amended to date.
  *4.1    Specimen certificate for shares of Common Stock.
  *4.2    Shareholders Rights Agreement among the Registrant and the 
          shareholders listed on Exhibit A thereto.
 **4.3    Registration Rights Agreement, dated as of July 18, 1997, between 
          the Registrant and International Biotechnology Trust plc.
 **4.4    Registration Rights Agreement, dated as of July 18, 1997, among the 
          Registrant, H&Q Healthcare Investors and H&Q Life Science Investors.
 **5.1    Opinion of Bingham Dana LLP
**23.1    Consent of Bingham Dana LLP (included in Exhibit 5.1)
  23.2    Consent of Coopers & Lybrand L.L.P.

___________

*    Incorporated by reference from the Registrant's Registration Statement on
     Form S-1 (Registration No. 333-6795). 
**   Previously filed. 

                                      II-4


<PAGE>

                                                       
                                                                   Exhibit 23.2


                        CONSENT OF INDEPENDENT ACCOUNTANTS
                                 
                                 
We consent to the inclusion in this registration statement on Post-Effective 
Amendment No. 1 to Form S-1 on Form S-3 (File number 333-33883) of our report 
dated February 12, 1997 (except as to the information in the last paragraph 
of Footnote F, for which the date is August 18, 1997), on our audits of the 
financial statements of Cubist Pharmaceuticals, Inc.  We also consent to the 
reference to our firm under the caption "Experts."

                                             /s/ Coopers & Lybrand L.L.P.
                                             ---------------------------
                                             COOPERS & LYBRAND L.L.P.



Boston, Massachusetts
January 9, 1998





© 2022 IncJournal is not affiliated with or endorsed by the U.S. Securities and Exchange Commission