IMMUNOMEDICS INC
S-3, 2000-02-28
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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                           Registration No. 333- _____

    As filed with the Securities and Exchange Commission on February 25, 2000

                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

                                    FORM S-3

             REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

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

                  Delaware                              61-1009366
          (State or other jurisdiction of              (I.R.S. Employer
           incorporation or organization)             Identification No.)

                                300 American Road
                         Morris Plains, New Jersey 07950
                                 (973) 605-8200
                   (Address, including zip code, and telephone
                         number, including area code, of
                        registrant's principal executive offices)
                             Dr. David M. Goldenberg
                      Chairman and Chief Executive Officer
                               Immunomedics, Inc.
                                300 American Road
                         Morris Plains, New Jersey 07950
                                 (973) 605-8200
 (Name, address, including zip code, and telephone number, including area code,
                              of agent for service)
                              ---------------------
                          Copies of all communications,
                          including all communications
                              sent to the agent for
                           service, should be sent to:
                            Peter H. Ehrenberg, Esq.
                              Lowenstein Sandler PC
                              65 Livingston Avenue
                           Roseland, New Jersey 10024
                                 (973) 597-2500

Approximate  date of commencement  of proposed sale to the public:  From time to
time after the effective date of this Registration Statement.

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, 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: [ ]

<TABLE>
<CAPTION>

                         CALCULATION OF REGISTRATION FEE

Title of Each Class of          Amount of Shares to be     Proposed Maximum         Proposed Maximum              Amount of
Securities to be Registered          Registered (1)       Offering Price Per            Aggregate            Registration Fee
                                                              Share(2)              Offering Price(3)
- ---------------------------          --------------       ------------------        -----------------        ----------------

<S>                             <C>                       <C>                       <C>                      <C>

Common Stock, $.01 par
value per share                      2,325,000             $  26.0625                $ 60,595,312.50               $ 15,998

</TABLE>

(1) Represents shares of common stock available for resale by purchasers under a
Common Stock Purchase Agreement, dated as of February 14, 2000, by and among the
Registrant and such purchasers.

(2) Pursuant to Rule 457(c),  the proposed  maximum offering price per share and
proposed maximum  aggregate  offering price have been calculated on the basis of
the average of the high and low sale prices of the registrant's  common stock as
reported on The Nasdaq National Market on February 24, 2000.

<PAGE>

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.

                                      -2-
<PAGE>

The  information in this Prospectus is subject to completion and may be changed.
The selling  stockholders  may not sell these  securities until the registration
statement  filed with the  Securities  and  Exchange  Commission  (of which this
Prospectus  is a part) is  effective.  This  Prospectus  is not an offer to sell
these securities, and is not soliciting an offer to buy these securities, in any
state where such offer or sale is not permitted

PROSPECTUS

                               IMMUNOMEDICS, INC.

                        2,325,000 Shares of Common Stock

The Issuer

Immunomedics. Inc.
300 American Road
Morris Plains, New Jersey 07950
(973) 605-8200

The Selling Stockholders

         The  selling  stockholders  are  offering to sell  2,325,000  shares of
common  stock that we issued to them on February  14, 2000  pursuant to a Common
Stock Purchase Agreement.  Additional  information concerning our agreement with
the selling stockholders is set forth under the caption "Immunomedics - February
2000 Financing."

Trading Symbol

         Nasdaq National Market -  "IMMU"

         The closing sale price of a share of our common stock on Nasdaq on
February [__], 2000 was $[__].

The Offering

         The selling  stockholders may sell shares of our common stock from time
to time on the  Nasdaq  National  Market at the  prevailing  market  price or in
private,  negotiated transactions.  The shares will be sold at prices determined
by the selling  stockholders.  We will not receive any part of the proceeds from
the sale. We are paying the expenses in connection with the  registration of the
shares with the SEC. The selling stockholders may be deemed to be "underwriters"
within the meaning of the Securities  Act in connection  with the sale of shares
of our common stock.

         A  purchase  of  shares  involves  a high  degree of risk.  You  should
purchase shares only if you can afford a complete loss of your  investment.  See
"Risk Factors" beginning on page 4.

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

                                 _________, 2000


<PAGE>

                                TABLE OF CONTENTS

Risk Factors:
           We Have a History of Operating Losses and May Never Become
              Profitable........................................................
           We May Not Be Able to Successfully Develop a Market for Our Approved
              Products..........................................................
           We May Not Receive Approval to Sell LeukoScan in the United States
              in a Timely Manner................................................
           We May Not Be Able to Bring to Market the Products We Are Currently
              Developing or Sustain Their Sales After Approval..................
           If We Require and Do Not Obtain Additional Capital, We May Be
              Required to Curtail Our Operations................................
           Our Limited Marketing and Sales Experience and Capability Could
              Impact Our Ability to Successfully Sell Our Current Products......
           We May Have to Rely on Partners to Help Us Market and Sell Our
              Products Under Development........................................
           We Could Be Temporarily Unable to Sell Our Products If Our Agreements
              with our Distributors Were Terminated.............................
           We Could Be Temporarily Unable to Sell Our Products If Our Agreement
              with our End Stage Manufacturer Was Terminated....................
           Our Internal Manufacturing Capability May Limit What We Can Sell.....
           We May Be Unable to Continue to Use Mouse Fluids for Future Products
              Which Could Require Us to Make Expensive and Time Consuming
              Changes to Our Products in Development............................
           Our Product Development Is Dependent Upon Our Continued Relationship
              with The Center for Molecular Medicine and Immunology.............
           Certain Potential Conflicts of Interest Exist with The Center for
              Molecular Medicine and Immunology Which Could Affect Our
              Operations........................................................
           We May Not Be Able to Obtain Government Regulatory Approval in a
              Timely Manner to Market and Sell Our Products or Approval May Be
              Withdrawn.........................................................
           Our Business Involves the Use of Hazardous Materials.................
           We Must Maintain Our Manufacturing Facilities in Accordance With
              Government Regulatory Requirements................................
           We Have Agreed to Certain Covenants in our 1999 Financing Which Place
              Restrictions on the Operation of our Business.....................
           Changes to Health Care Reimbursement Could Adversely Affect Our
              Operations........................................................
           The Loss of Key Employees Could Adversely Affect our Operations......
           We Face Substantial Competition in the Biotechnology Field and
              May Not Be Able to Successfully Compete...........................
           Our Products May Be Rendered Obsolete By Rapid Technological Change..
           If We Are Unable to Protect Our Intellectual Property Rights, We
              Could Lose Our Competitive Advantage..............................
           Our Products May Infringe Third Party Intellectual Property Rights...
           Our Operations Could Suffer If We Are Unsuccessful in Our Pending
              Infringement Claims Concerning Our CEA Antibodies.................
           Product Liability Claims in Excess of the Amount of Our Insurance
              Would Adversely Affect Our Financial Condition....................
           Our Principal Stockholder Can Influence Most Matters Requiring
              Approval By Our Stockholders......................................
           Resales of Shares Held By Our Directors and Executive Officers May
              Lower the Market Price of Our Common Stock........................
           Our Stock Price Has Been Volatile....................................

                                      -2-

<PAGE>

           Stockholders Could Be Adversely Affected By Our Anti-Takeover
              Provisions........................................................
           Stockholders Should Not Expect that We Will Pay Dividends............
           Special Note Regarding Forward-Looking Statements....................

Where You Can Find More Information.............................................

Immunomedics:
           Description of Our Business..........................................
               February 2000 Financing; Covenants
               Use of Proceeds..................................................

Selling Stockholders............................................................

Plan of Distribution:
           Manner of Sales; Broker-Dealer Compensation..........................
           Filing of a Post-Effective Amendment In Certain Instances............
           Certain Persons May Be Deemed to Be Underwriters.....................
           Regulation M.........................................................
           Indemnification and Other Matters....................................

Legal Matters...................................................................

Experts.........................................................................

         You  should  rely  on the  information  incorporated  by  reference  or
provided in this prospectus or any supplement.  We have not authorized anyone to
provide  you  with  different  information.  You  should  not  assume  that  the
information  in this  prospectus  or any  supplement  is accurate as of any date
other than the date on the front of such document.  The selling stockholders are
not making an offer of our shares in any state where the offer is not permitted.

                                      -3-
<PAGE>

                                  RISK FACTORS

         Investing  in our common  stock  involves a high  degree of risk.  As a
result,  you should be able to sustain a complete  loss of your  investment.  In
addition  to the other  information  in this  prospectus,  you should  carefully
consider the following factors before purchasing any of our common stock.

We Have a History of Operating Losses and May Never Become Profitable

         We have had  significant  operating  losses since our formation in 1982
and have not earned a profit since our  inception.  These  operating  losses and
failure to be profitable have been due mainly to the significant amount of money
that we have had to spend on research and development.  As of December 31, 1999,
we had an accumulated  deficit of  approximately  $104.1  million.  We expect to
continue to experience  operating losses until such time, if at all, that we are
able to generate  sufficient  revenues from sales of  CEA-Scan(r),  LeukoScan(r)
and/or our other potential products.

We May Not Be Able to Successfully Develop a Market for Our Approved Products

         CEA-Scan and LeukoScan  are the only products  which we are licensed to
market and sell. To date,  we have received only limited  revenues from the sale
of these  products.  We cannot  assure  you that  these  products  or any of our
proposed products will achieve market acceptance or generate significant sales.

We May Not Receive Approval to Sell LeukoScan in the United States in a Timely
Manner

         We have  not yet  received  approval  from the FDA to  market  and sell
LeukoScan in the United States and cannot  assure you as to when, if ever,  that
we will obtain  approval.  In addition,  the FDA could impose  conditions on its
approval,  which could  significantly  affect the  commercial  viability  of the
product  or could  require us to  undertake  significant  additional  studies or
otherwise expend additional  significant funds. If we do not receive approval to
market and sell  LeukoScan in the United States in the near future or if the FDA
imposes  significant  conditions or  restrictions,  our business and  operations
could be significantly and adversely affected.

We May Not Be Able to Bring to Market the Products We Are Currently Developing
or Sustain Their Sales After Approval

         Before any of our  products  that we are  currently  developing  can be
marketed and sold, we must undertake  substantial research and development.  All
new products face a high degree of uncertainty, including the following:

*    We may not receive regulatory approval to perform human clinical trials for
     the products we currently have planned or we may be unable to  successfully
     complete our ongoing clinical trials.

*    The  results  from  preclinical  studies  and  clinical  trials  may not be
     indicative of results that will be obtained in later-stage testing.

*    We may be unable to timely recruit a sufficient  number of patients for our
     clinical  trials.  Delays  in  planned  patient  enrollment  may  result in
     increased costs and delays.

*    We may be unable to obtain  approval  from the FDA and  comparable  foreign
     authorities  because we are unable to demonstrate  that the product is safe
     and effective for the intended  use, or obtaining  regulatory  approval may
     take  significantly  more time and cost  significantly  more  money than we
     currently anticipate.

                                      -4-
<PAGE>

*    We may discover that the product has undesirable or unintended side effects
     or other characteristics that make it impossible or impracticable for us to
     continue development or which may limit the product's commercial use.

*    We do not expect that any new product  which is  currently  in research and
     development will be commercially available for at least several years.

*    We may be unable  to  produce  the  product  in  commercial  quantities  at
     reasonable cost.

*    We may  be  unable  to  successfully  market  the  product  or to  find  an
     appropriate corporate partner, if necessary,  to assist us in the marketing
     of the product.

*    The product may not gain satisfactory market acceptance.

*    The product may be superseded  by another  product  commercialized  for the
     same  indication  or may  infringe  patents  issued to others,  which would
     prevent us from marketing and selling the product.

*    After  approval,  the product may be recalled or withdrawn at any time as a
     result  of  regulatory  issues,   including  those  concerning  safety  and
     efficacy.

If we are  unable to  continue  to  develop  products  that we can  successfully
market,  our business,  financial  condition  and results of operations  will be
significantly and adversely affected.

If We Require and Do Not Obtain Additional Capital, We May Be Required to
Curtail Our Operations

         Our February 2000 financing has provided us with needed capital.  While
we believe that we have now  satisfied our immediate  capital  requirements,  we
cannot assure you that additional  capital may not be required in the future. If
we require  additional  capital and are unable to obtain capital on satisfactory
terms,  we may be  required  to  significantly  reduce our  operating  expenses,
including  the amount of  resources  devoted  to  marketing  and sales,  product
development  and clinical  trials,  which could have a  significant  and adverse
effect  on us.  We  cannot  assure  you that any  additional  financing  will be
available to us at all or on terms we find  acceptable  or that the terms of any
financing will not cause substantial dilution to our existing stockholders.

Our Limited Marketing and Sales Experience and Capability Could Impact Our
Ability to Successfully Sell Our Current Products

         We are  relying,  in  substantial  part,  on our own limited  sales and
marketing  organization to market CEA- Scan and LeukoScan.  We cannot assure you
that we can  successfully  maintain and continue to build our sales force. If we
are unable to continue to build and  maintain  our sales  force,  our  financial
condition and operating results may be significantly and adversely affected.

We May Have to Rely on Partners to Help Us Market and Sell Our Products Under
Development

         The marketing and sale of our proposed  products may be dependent  upon
our entering into  arrangements  with corporate  partners.  We cannot assure you
that we  will  be  successful  in  forming  these  relationships  or that  these
relationships, even if formed, will be successful.

                                      -5-
<PAGE>

We Could Be Temporarily Unable to Sell Our Products If Our Agreements with our
Distributors Were Terminated

         We  currently  do not have the  resources  to  internally  develop  and
maintain the operating  procedures  required by the FDA and  comparable  foreign
regulatory  authorities to oversee distribution of our products. As a result, we
have entered into  arrangements  with third parties to perform this function for
the foreseeable future. If these agreements are terminated,  we will be required
to enter into arrangements with other government approved third parties in order
to be  able to  distribute  our  products.  We will be  unable  to  continue  to
distribute  our products until an acceptable  alternative  is identified.  If we
were even only temporarily unable to distribute our products, our business could
be significantly and adversely effected.

We Could Be Temporarily Unable to Sell Our Products If Our Agreement with our
End Stage Manufacturer Was Terminated

         We rely on a single third party to perform certain  end-stage  portions
of the  manufacturing  process for CEA-Scan and LeukoScan which we are unable or
do not have the  resources  to  perform.  If this  third  party  were to  become
unavailable,  we would be unable to complete the manufacturing  process until we
entered into an agreement with another  qualified  entity.  We cannot assure you
that we will be able to negotiate an agreement  with another  entity on terms we
consider  acceptable,  if at all. Even if we were able to do so, any substantial
delay in our  ability  to  manufacture  our  products  could  significantly  and
adversely affect our operations.

Our Internal Manufacturing Capability May Limit What We Can Sell

         If demand for our approved product increases  significantly,  we cannot
assure you that we will continue to have the capacity to manufacture  commercial
quantities successfully.  In addition, if any of our other products are approved
for  marketing  and sale, we cannot assure you that we will continue to have the
capacity and expertise to manufacture commercial quantities of multiple products
successfully or with acceptable profit margins. If we were even only temporarily
unable to manufacture  sufficient quantities of our products to meet demand, our
business could be significantly and adversely affected.

We May Be Unable to Continue to Use Mouse Fluids for Future Products Which Could
Require Us to Make Expensive and Time Consuming Changes to Our Products in
Development

         CEA-Scan  and  certain of our other  imaging  agents are  derived  from
ascites fluid produced in mice. Regulatory authorities,  particularly in Europe,
have  expressed  concerns  about  the use of mice  fluid for the  production  of
monoclonal  antibodies.  We cannot assure you that regulatory  authorities  will
agree that our quality control  procedures will be adequate for future products.
While we are  continuing  our  development  efforts  to  produce  certain of our
monoclonal  antibodies  using cell culture methods,  this process  constitutes a
substantial  production  change,  which will  require  additional  manufacturing
equipment and new  regulatory  approval.  We cannot assure you that we will have
the resources to acquire the additional manufacturing equipment and resources or
that we will receive the required  regulatory  approval on a timely basis, if at
all.  We also  have  contracted  with a third  party  for  the  development  and
production of certain humanized antibodies,  but we cannot assure you that these
efforts will be successful.

Our Product Development Is Dependent Upon Our Continued Relationship with The
Center for Molecular Medicine and Immunology

         The Center for  Molecular  Medicine and  Immunology,  a  not-for-profit
cancer research center,  performs pilot and pre-clinical trials in product areas
of importance to us. CMMI also conducts basic  research and patient  evaluations
in a number  of areas of  potential  interest  to us.  If CMMI were no longer to
provide these  services,  we would have to make  alternative  arrangements  with
third parties which could  significantly  delay and increase expenses associated
with pre-clinical testing and initial clinical trials.

                                      -6-
<PAGE>

Certain Potential Conflicts of Interest Exist with The Center for Molecular
Medicine and Immunology Which Could Affect Our Operations

         Dr. David M. Goldenberg,  our Chairman and Chief Executive Officer,  is
the  founder,  President  and a member of the  Board of  Trustees  of CMMI.  Dr.
Goldenberg  devotes  more of his time working for CMMI than for us. In addition,
other key personnel  currently have  responsibilities  both to CMMI and us. As a
result,  the potential for conflict of interest  exists and disputes could arise
over the allocation of research projects and ownership of intellectual  property
rights.

We May Not Be Able to Obtain Government Regulatory Approval in a Timely Manner
to Market and Sell Our Products or Approval May Be Withdrawn

         Regulation by governmental authorities in the United States and foreign
countries  is a  significant  factor in the  manufacture  and  marketing  of our
presently marketed and proposed products as well as our research and development
activities.  All of our proposed  products will require  regulatory  approval by
governmental  agencies prior to commercialization  and our products must undergo
rigorous   preclinical  and  clinical  testing  and  other  premarket   approval
procedures by the FDA and comparable  foreign  authorities.  In addition,  since
certain of our potential  products involve the application of new  technologies,
regulatory  approvals  may take longer  than for  products  produced  using more
conventional  methods.  Once we begin  clinical  trials for a new  diagnostic or
therapeutic  product,  it may  take  five to ten  years or more to  receive  the
required  regulatory  approval to commercialize that product and begin to market
it to the  public.  Various  federal  and,  in some cases,  state  statutes  and
regulations  also  govern or  influence  the  manufacturing,  safety,  labeling,
storage,  record keeping and marketing of these products. The lengthy process of
seeking these approvals,  and the subsequent compliance with applicable statutes
and regulations,  will require us to expend substantial resources. If we fail to
obtain or are otherwise substantially delayed in obtaining regulatory approvals,
our business and operations could be significantly and adversely affected.

         In  responding  to  a  new  drug  application,  or a  biologic  license
application,  a government  regulator  may grant  marketing  approvals,  request
additional  information  or  further  research,  or deny the  application  if it
determines  that  the  application  does not  satisfy  its  regulatory  approval
criteria.  Approvals  may not be granted  on a timely  basis,  if at all,  or if
granted  may not cover all the  clinical  indications  for which we are  seeking
approval  or may  contain  significant  limitations  in the  form  of  warnings,
precautions or  contraindications  with respect to conditions of use. Even after
approval,  we may be  required  to recall or  withdraw  a product as a result of
subsequently discovered safety or efficacy concerns.

Our Business Involves the Use of Hazardous Materials

         In  addition to laws and  regulations  enforced by the FDA, we are also
subject to regulation under various other foreign,  federal, state or local laws
and  regulations.  Our research and  development  involves the controlled use of
hazardous materials,  chemicals,  viruses and various radioactive compounds. The
risk of  accidental  contamination  or injury  from  these  materials  cannot be
completely  eliminated.  If an accident occurs,  we could be held liable for any
damages that result and any liability could exceed our resources.

We Must Maintain Our Manufacturing Facilities in Accordance With Government
Regulatory Requirements

         Our  facilities  are subject to  inspection  by the FDA and  comparable
foreign  authorities.  A separate  license is sometimes  required for commercial
manufacture  of any product.  Failure to maintain  these licenses or to meet the
regulatory  inspection  criteria would result in disruption to our manufacturing
processes  and could have a significant  and adverse  effect on our business and
operations.

                                      -7-
<PAGE>

We Have Agreed to Certain Covenants in our 1999 Financing Which Place
Restrictions on the Operation of our Business

         In  connection  with our  December  1999  financing,  we have agreed to
certain covenants,  including  covenants that will apply unless the investors in
that offering and their  affiliates  beneficially own less than 5% of our common
stock. Among other things, we have agreed that without the prior consent of such
investors,  we may not sell our  business to anyone that is an  affiliate of the
company,  unless the sale is for  consideration  at least  equal to (a) the fair
market  value in the event of a sale of assets (as  determined  in good faith by
our board of directors)  or (b) the then current  market price in the event of a
sale of stock.  See "February  2000  Financing;  Covenants."  As of February 18,
2000, such investors in the aggregate beneficially owned 6.4% of our outstanding
common stock.

Changes to Health Care Reimbursement Could Adversely Affect Our Operations

         Our ability to successfully  commercialize  our products will depend in
part on the  extent  to which  reimbursement  for the cost of our  products  and
related  treatment  will be  available  from  government  health  administration
authorities, private health insurers and other organizations.  These third-party
payers are increasingly  challenging the price of medical products and services.
Several proposals have been made that may lead to a government-directed national
health  care  system.  Adoption  of this  type of  system  could  further  limit
reimbursement  for  medical  products,  and we cannot  assure you that  adequate
third-party  coverage  will be available  to enable us to maintain  price levels
sufficient  to  realize  an  appropriate  return on our  investment  in  product
development.  In addition, we also cannot assure you that the U.S. government or
foreign  governments  will not implement a system of price controls.  Any system
might  significantly  and  adversely  affect our ability to market our  products
profitably.

The Loss of Key Employees Could Adversely Affect our Operations

         As a small  biotechnology  company,  we are heavily  dependent upon the
talents  of  Dr.  Goldenberg  and  certain  key  scientific  personnel.  If  Dr.
Goldenberg or any of our other key personnel  leave our employ,  our  operations
could be significantly and adversely affected. In addition, from time to time we
have a need to expand our management and scientific  personnel.  Competition for
qualified  personnel  in the  biotechnology  and  pharmaceutical  industries  is
intense and we cannot assure you that we will be  successful in our  recruitment
efforts.  If we are  unable  to  retain  or,  when  needed,  attract  additional
qualified  personnel,  our operations also could be significantly  and adversely
affected.

We Face Substantial Competition in the Biotechnology Field and May Not Be Able
to Successfully Compete

         The biotechnology  industry is highly competitive,  particularly in the
area of cancer diagnostic and therapeutic  products.  We are likely to encounter
significant  competition  with respect to our  existing  products as well as our
products  currently  under  development.  A number of companies,  including IDEC
Pharmaceuticals,  Genentech,  SmithKline Beecham,  Nycomed Amersham, and Coulter
Pharmaceutical,  are engaged in the  biotechnology  field, and in particular the
development  of  cancer  diagnostic  and  therapeutic  products.  Many of  these
companies  have  significantly   greater  financial,   technical  and  marketing
resources  than  us.  In  addition,  many  of  these  companies  may  have  more
established positions in the pharmaceutical  industry and may be better equipped
than us to develop, refine and market their products.

         We also expect to face increasing  competition  from  universities  and
other  non-profit  research  organizations.   These  institutions  carry  out  a
significant  amount of research and  development in the field of  antibody-based
technology.  These  institutions  are  becoming  increasingly  more aware of the
commercial  value of their  findings and more active in seeking patent and other
proprietary rights, as well as licensing revenues.

                                      -8-
<PAGE>

Our Products May Be Rendered Obsolete By Rapid Technological Change

         We are  pursuing an area of product  development  in which there is the
potential for extensive technological innovations in relatively short periods of
time. We cannot assure you that our  competitors  will not succeed in developing
products that are safer or more effective than our products. Rapid technological
change or developments  by others may result in our current  products as well as
those in development becoming noncompetitive or obsolete.

If We Are Unable to Protect Our Intellectual Property Rights, We Could Lose Our
Competitive Advantage

         Our  commercial  success is highly  dependent  upon  patents  and other
proprietary  rights  that we own or license.  We cannot  assure you that our key
patents  will  not be  invalidated  or  will  provide  us  protection  that  has
commercial  significance.  Litigation  may be  necessary  to protect  our patent
positions,  which could be costly and time consuming.  If any of our key patents
that we own or license are invalidated,  our business may be  significantly  and
adversely  affected.  In addition,  other  companies may  independently  develop
similar  trade  secrets  or  know-how  or obtain  access  to our trade  secrets,
know-how or  proprietary  technology,  which could  significantly  and adversely
affect our business.

Our Products May Infringe Third Party Intellectual Property Rights

         Other companies may have filed  applications  for, or have been issued,
patents  and  obtained  other  proprietary  rights  to  technology  which may be
potentially useful to us. Since we do not have the resources to maintain a staff
whose primary  function is to  investigate  the level of protection  afforded to
third  parties on devices and  components  which we use in our  products,  it is
possible that a third party could  successfully claim that our products infringe
on their intellectual  property rights. If this were to occur, we may be subject
to substantial damages, and we may not be able to obtain appropriate licenses at
a cost we could  afford and we may not have the ability to timely  redesign  our
products.  If we are  required  to pay  damages  or are  unable to obtain  these
rights, our business could be significantly and adversely  affected.  Even if we
are successful in defeating any alleged  infringement  claims,  litigation could
result in a substantial diversion of managerial time and resources,  which could
be better and more fruitfully utilized on other activities.

Our Operations Could Suffer If We Are Unsuccessful in Our Pending Infringement
Claims Concerning Our CEA Antibodies

         We are involved in certain litigation with F.  Hoffmann-LaRoche and its
affiliates concerning the validity our European patents covering the antibody we
use in our CEA-Scan cancer imaging product and our  CEA-Cide(tm)  cancer therapy
product,  as well as the use of highly specific anti-CEA antibodies for a number
of other uses. We have claimed that they have infringed our patent and they have
counter-claimed  seeking to nullify the patents that were issued.  If we receive
an  unfavorable  outcome  in  any  of  these  matters,  our  business  could  be
significantly and adversely affected.

Product Liability Claims in Excess of the Amount of Our Insurance Would
Adversely Affect Our Financial Condition

         The  clinical  testing,  marketing  and  manufacturing  of our products
necessarily  involve  the risk of product  liability.  While we  currently  have
product  liability  insurance,  we cannot  assure that we will be able to obtain
insurance in the future at an acceptable  cost, if at all. If we cannot maintain
our existing or comparable liability  insurance,  our ability to test clinically
and market our products may be significantly impaired.  Moreover, the amount and
scope  of our  insurance  coverage  or  indemnification  arrangements  with  any
distributor or other third party upon which we rely may be inadequate to protect
us in the event of a successful  product liability claim. Any claim in excess of
the amount of any insurance we then had could significantly and adversely affect
our financial condition and operating results.

                                      -9-
<PAGE>

Our Principal Stockholder Can Influence Most Matters Requiring Approval By Our
Stockholders

         As of  February  18,  2000,  Dr.  Goldenberg,  our  Chairman  and Chief
Executive Officer,  controlled the right to vote over approximately 24.9% of our
common stock (excluding options to purchase 337,500 shares). As a result of this
voting power,  Dr.  Goldenberg may have the ability to determine the election of
all  of  our  directors,   direct  our  policies  and  control  the  outcome  of
substantially all matters which may be put to a vote of our stockholders.

Resales of Shares Held By Our Directors and Executive Officers May Lower the
Market Price of Our Common Stock

         As of February 18, 2000, we had a total of 48,897,746  shares of common
stock outstanding,  12,290,456 of which were held by our directors and executive
officers  (excluding options to purchase 865,000 shares).  Absent  registration,
these  shares  may only be resold in  limited  quantities  and only  within  the
limitations imposed by Rule 144 under the Securities Act. The mere prospect that
these shares may be publicly  resold could lower the market price for our common
stock.  One of our  directors,  Dr. Morton  Coleman,  is eligible to sell shares
pursuant to this prospectus. See "Selling Stockholders."

Our Stock Price Has Been Volatile

         We believe  that a variety of factors  have caused the market  price of
our  common  stock to  fluctuate  substantially,  and that it will  continue  to
fluctuate in the future. These factors include:

*    actual or anticipated fluctuations in our operating results;

*    the status of our products in development;

*    new products or technical innovations by us or by our existing or potential
     competitors;

*    the formation or  termination of our corporate  alliances and  distribution
     arrangements;

*    prolonged  periods of  regulatory  review of new  products  or new uses for
     existing products;

*    determinations regarding our patent applications and those of others;

*    trading strategies occurring in the market place with respect to our common
     stock; and

*    general market  conditions and other factors unrelated to us or outside our
     control.

Stockholders Could Be Adversely Affected By Our Anti-Takeover Provisions

         Our board of directors has the  authority,  without any further vote by
our stockholders,  to issue up to 10,000,000 shares of preferred stock in one or
more series and to determine the designations, powers, preferences and relative,
participating,  optional or other rights  thereof,  including the dividend rate,
whether dividends are cumulative,  conversion rights,  voting rights, rights and
terms of redemption,  redemption price and liquidation  preference.  Issuance of
preferred  stock could have the effect of delaying,  deterring  or  preventing a
change in control of our company,  or could impose various  procedural and other
requirements  that could make it more  difficult for holders of our common stock
to effect certain corporate actions,  including the ability to replace incumbent
directors  and to  accomplish  transactions  opposed by the  incumbent  board of
directors.  The rights of the  holders of our common  stock would be subject to,
and may be  adversely  affected  by, the rights of the holders of any  preferred
stock that may be issued in the future.

                                      -10-
<PAGE>

Stockholders Should Not Expect That We Will Pay Dividends

         We  have  never  paid  any  dividends  on our  common  stock.  For  the
foreseeable  future,  we expect to  retain  earnings,  if any,  to  finance  the
expansion and development of our business.  Any future payment of dividends will
be within  the  discretion  of our Board of  Directors  and will  depend  upon a
variety of factors, including our earnings, capital requirements,  and operating
and financial condition.

Special Note Regarding Forward-Looking Statements

         We have made  statements  in this  prospectus,  and in the documents we
incorporate  by  reference,  that are  "forward-looking  statements"  within the
meaning of the Private Securities Litigation Reform Act of 1995. Sometimes these
statements contain words like "may," "believe," "expect,"  "continue," "intend,"
"anticipate,"  "plan,"  "seek" and  "estimate"  or other  similar  words.  These
statements  could  involve  known and  unknown  risks,  uncertainties  and other
factors  that might  significantly  alter the actual  results  suggested  by the
statements.  In other words, our performance  might be quite different from what
the  forward-looking  statements imply. The following factors,  as well as those
discussed  above in this "Risk  Factors"  section and in the documents  which we
incorporate by reference, could cause our performance to differ from the implied
results:

*    inherent   uncertainties   accompanying   the  marketing  of  CEA-Scan  and
     LeukoScan.

*    inherent uncertainties involving new product development and marketing.

*    inability  to  obtain  capital  for  continued   product   development  and
     commercialization.

*    actions of regulatory authorities concerning product approval.

*    actions of government and private organizations concerning reimbursement of
     medical expenses.

*    impact of competitive products and pricing.

*    results of clinical trials.

*    loss of key employees.

*    changes in general economic and business conditions.

*    changes in industry trends.

We have no obligation to release  publicly the result of any revisions to any of
our  "forward-looking  statements" to reflect events or circumstances that occur
after  the  date of this  prospectus  or to  reflect  the  occurrence  of  other
unanticipated events.

                                      -11-
<PAGE>

                       WHERE YOU CAN FIND MORE INFORMATION

       We publicly file annual,  quarterly and current reports, proxy statements
and other  documents with the SEC. You may read and copy any of these  documents
at the SEC's public reference rooms, which are located at:

                                        450 Fifth Street, N.W.
                                        Washington, D.C.  20549

                                        7 World Trade Center, Suite 1300
                                        New York, New York  10048

                                        500 West Madison Street, Suite 1400
                                        Chicago, Illinois  60661-2511

         Please call the SEC at  1-800-SEC-0330  for further  information on the
public   reference   rooms.   The  SEC   maintains   an   Internet   website  at
http://www.sec.gov where our publicly filed documents may be obtained.

         This prospectus is part of a registration statement filed with the SEC.
Our  registration  statement  contains  more  information  than this  prospectus
regarding  us and our  common  stock  and  includes  supplemental  exhibits  and
schedules.  You can obtain a copy of the registration  statement from the SEC at
the address listed above or from its Internet website.

         The SEC allows us to  "incorporate  by reference"  into this prospectus
the  information we file with it. This means that we are deemed to be disclosing
such information to you by referring you to those documents. This information is
important and should be reviewed.  The information  incorporated by reference is
considered to be part of this  prospectus,  and later  information  that we file
with the SEC will  automatically  update and supersede the  information  in this
prospectus.

         We incorporate by reference into this  prospectus the documents  listed
below and any future filings we make with the SEC under Sections  13(a),  13(c),
14 or 15(d) of the Securities Exchange Act:

     *    Annual Report on Form 10-K for the fiscal year ended June 30, 1999;

     *    Proxy  Statement,  dated  October 18,  1999,  with respect to our 1999
          annual meeting of stockholders;

     *    Quarterly Reports on Form 10-Q for the fiscal quarters ended September
          30, 1999 and December 31, 1999;

     *    Current  Reports on Form 8-K, dated November 24, 1999 and February 23,
          2000; and

     *    Description   of  our  common  stock   contained  in  Item  1  of  our
          Registration Statement on Form 8-A, dated May 7, 1984.

         You may  request a copy of these  filings,  at no cost,  by  calling or
writing us at the following address:

                           Immunomedics, Inc.
                           300 American Road
                           Morris Plains, New Jersey 07950
                           (973) 605-8200
                           Attention:  Investor Relations

                                      -12-
<PAGE>

                                  IMMUNOMEDICS

Description of Our Business

         We are a biopharmaceutical  company,  which develops,  manufactures and
markets  products for the detection and treatment of cancers and other diseases.
These  products,  which are based on our  monoclonal  antibody  technology,  are
designed to deliver  radioisotopes,  chemotherapeutic  agents,  toxins,  dyes or
other substances to a specific disease site or organ system.

         We have received  approval from the respective  regulatory  agencies in
the United States,  the 15 member  countries of the European  Union,  Canada and
certain other countries to market and sell CEA-Scan  (arcitumomab),  our imaging
product for the detection of recurrent and/or metastatic colorectal cancer.

         We  also  have   received   approval  to  market  and  sell   LeukoScan
(sulesomab),  our imaging  product for detection and diagnosis of  osteomyelitis
(bone  infection) in long bones and in diabetic foot ulcer  patients,  in the 15
member  countries of the European Union.  We have filed an application  with the
FDA in the U.S. and the comparable  regulatory  agency in Canada for approval to
market  LeukoScan for the imaging of infection in  osteomyelitis  as well as for
the imaging of infection in acute, atypical  appendicitis.  We have been advised
by the FDA that there are still  deficiencies  with our application  relating to
the  adequacy  of our  data  necessary  to  support  final  approval  for  these
indications.  Despite our confidence  that we were making  progress with the FDA
and had adhered to all agreements and guidelines,  it is now clear to us that we
need  to take  whatever  steps  are  available  to us to  gain a more  receptive
audience in order to gain marketing approval for this product. We can not assure
you that we will receive FDA approval for this product in a timely manner, or at
all.

         Marketing, Sales and Distribution

         CEA-Scan  is  marketed  and sold in the U.S.  directly  by our  limited
internal sales force, who are focused on new customers in major medical centers.
Our skilled nuclear medicine  technicians work with this sales force and provide
technical support directly to our customers. We have entered into a distribution
arrangement in the U.S. with Integrated  Commercialization Solutions, a division
of Bergen Brunswig  Corporation,  to provide product support services  including
customer service, order management,  distribution,  invoicing and collection. We
also  have an  agreement  with  Syncor  International,  a  leading  provider  of
radiopharmacy  services,  under which  Syncor  makes  CEA-Scan  available to its
hospital and clinic  accounts  throughout  the U.S.,  supported by our sales and
technical support specialists.

         Our European  operations,  headquartered in Hillegom,  The Netherlands,
include  European  management,   sales  and  marketing,   customer  service  and
invoicing,   collection  and  other  administrative   functions.  We  also  have
established  sales  representation  in most major European  markets.  We service
other markets  through the appointment of local  distributors  who provide sales
and  marketing  support  as  well  as  local  product  distribution.  We have an
agreement with Eli Lilly Deutschland GmbH to package and distribute our products
throughout the 15 member countries of the European Union and other countries.

         Imaging Products

         Our imaging  products  involve  injecting a patient with a radioisotope
attached to an  antibody  fragment.  An antibody is a protein  that can find and
attach  itself to a specific  substance  called an antigen.  These  antigens are
present  on tumor  cells,  white  blood  cells that  accumulate  at the sites of
infections,   and  other  disease  entities.   A  radioisotope   attached  to  a
disease-targeting  antibody  is  delivered  to a  disease  site for  imaging.  A
standard  nuclear  medicine  imaging  camera is then used to detect and  display
radioisotope concentrations at various sites of disease.

                                      -13-
<PAGE>

         The antibody fragment in CEA-Scan is directed against  carcinoembryonic
antigen  (CEA),  which is abundant at the site of  virtually  all cancers of the
colon  or  rectum.  CEA also is  associated  with  many  other  cancers.  We are
conducting phase IV clinical trials to evaluate the product  following  repeated
administration.  We also have been performing clinical trials using CEA-Scan for
imaging  lung cancer and breast  cancer.  We are  discussing  the results of our
breast cancer trials with European  regulatory  authorities to determine whether
the data will support the submission of applications for marketing approval.  In
addition,   we  are  continuing  our  efforts  in  developing  cancer  detection
applications with CEA-Scan utilizing  hand-held  radiation-detecting  probes for
use in colorectal cancer surgery.

         LeukoScan is a monoclonal antibody fragment that seeks out and binds to
white blood cells  (granulocytes)  associated  with a potentially  wide range of
infectious and inflammatory diseases.

         We are studying the following two other  imaging  products  pursuant to
Investigational  New Drug  applications  that we have filed or plan to file with
the FDA and for which we have ongoing clinical trials:

     *    LymphoScan(r), for non-Hodgkin's B-cell lymphomas.


     *    AFP-Scan(r),  for liver cancer and germ-cell tumors of the ovaries and
          testes.

       Therapeutic Products

         We are applying our expertise in antibody  selection,  modification and
  chemistry to cancer  therapeutics,  using monoclonal  antibodies  labeled with
  therapeutic  radioisotopes  or  conjugated  with  drugs.  We  are  engaged  in
  developing   anti-cancer   products,   principally  with  a  technique  called
  radioimmunotherapy. This technique may deliver radiolabeled therapeutic agents
  to tumor sites more selectively than current radiation  therapy  technologies,
  while minimizing  debilitating side effects. In addition, we are evaluating in
  clinical  trials  the  effects of our  non-radioactive  lymphoma  antibody  in
  non-Hodgkin's  lymphoma  patients and the effects of our  non-radioactive  CEA
  antibody in colorectal and breast cancer patients.

       Research Programs

         In addition to concentrating  on our products in clinical  development,
we conduct ongoing research in many related areas. We conduct research  in-house
and in collaboration with The Center for Molecular Medicine and Immunology, also
known as the  Garden  State  Cancer  Center,  and other  academic  and  research
centers.  In March 1999, we entered into a joint venture with Beckman Coulter to
develop  the next  generation  of  cancer  radiotherapeutics  using  bi-specific
antibodies.  We believe our  ongoing  research  efforts  will  identify  new and
improved products and techniques for diagnosing and treating various cancers and
infectious  diseases.  However,  we cannot  assure you that such efforts will be
successful, given the complex issues involved in such diagnosis and treatment.

         Our research  efforts are focused in various  areas related to our core
technology,  including  antibody  engineering  and the  identification  of other
antibody-directed  approaches  to  cancer  therapy.  We  have  made  significant
progress in  humanizing  certain  mouse  antibodies  and have  reengineered  the
humanized antibodies with improved  characteristics.  We are continuing our work
on  selective  coupling  of  therapeutic   site-specific  agents  onto  antibody
fragments  which  will  offer the  advantage  of  loading  multiple  therapeutic
compounds  onto  antibodies  at a particular  disease  site. We also continue to
investigate  pre-targeting,  whereby  an  antibody  is  administered  first as a
bi-specific fusion protein, followed by a radionuclide or drug administration.

         We also  are  continuing  our  research  into  the  use of  alternative
radioisotopes, such as Yttrium-90 in place of Iodine-131. Our research indicates
that  Yttrium-90 is retained by lymphoma cells for longer periods after antibody
metabolism,  and shows greater  efficacy  against  larger  tumors.  We also have
developed a technology using a compound called "DOTA" to tightly bind Yttrium-90
to antibodies.

         In addition,  we are continuing our efforts to scale-up our proprietary
method for technetium-99m radiolabeling of peptides, using single-vial kits.

                                      -14-
<PAGE>

February 2000 Financing; Covenants

         On February 14, 2000, we entered into a Common Stock Purchase Agreement
with a small group of private  investors,  each of whom is described  below as a
selling stockholder.  Under the Common Stock Purchase Agreement, on February 16,
2000, we sold the investors a total of 2,325,000 shares of our common stock at a
price of $16.00 per share, for gross proceeds of $37.2 million. We intend to use
the net  proceeds  for  continuing  research  and  development  for our existing
product line, for future clinical  trials,  for general working capital purposes
and in the operation of our business.

         Under the Common Stock  Purchase  Agreement,  we were  required to make
certain promises to the investors. These covenants included the following:

     *    We  agreed to  register  with the SEC the  shares  that we sold to the
          investors.  We promised to file a  preliminary  prospectus  within ten
          business days after the closing and thereafter to use our best efforts
          to have  our  registration  statement  declared  effective  by the SEC
          within 120 after the date of our filing.  We were successful in filing
          our preliminary prospectus prior to the ten business day deadline.

     *    We agreed to use the net proceeds in the manner described above.

         In a financing  that we  completed  in  December  1999 with a different
group of  purchasers,  we made certain  additional  covenants.  Those  covenants
included the following:

     *    We agreed to refrain  from  entering  into certain  transactions  with
          persons  closely  related  to our  company,  including  our  executive
          officers and  directors,  without the prior approval of the investors.
          The investors in the December  financing  agreed not to withhold their
          approval unreasonably.

     *    We agreed that without the prior  consent of the  investors,  we would
          not sell our  business to anyone that is an  affiliate of the company,
          unless the sale is for  consideration  at least  equal to (a) the fair
          market value in the event of a sale of assets (as  determined  in good
          faith by our board of directors) or (b) the then current  market price
          in the event of a sale of stock.

     *    We agreed that we would not amend our certificate of  incorporation or
          by-laws in a manner that would adversely affect the investors, without
          the prior  approval of the  investors.  The  investors in the December
          financing agreed not to withhold their approval unreasonably.

     *    We agreed that if, during a six month period specified in our December
          1999 Common Stock  Purchase  Agreement,  we issue shares of our common
          stock at a price of less than $3.00, we will issue  additional  shares
          of common stock to the  investors  to protect  them  against  dilution
          without  requiring any  additional  payment from the  investors.  This
          covenant is subject to certain exceptions; among other things, no such
          adjustment will be required if shares are issued below that price upon
          exercise or conversion of options,  warrants or convertible securities
          outstanding  on December  14,  1999 or in  connection  with  corporate
          partnering   transactions,   including   mergers.   Furthermore,   the
          calculation  of the  adjustment  is to be made on a  weighted  average
          basis.  Thus,  if the number of shares  that we issue in a  non-exempt
          transaction  is  not  significant,  or if the  per  share  price  in a
          non-exempt  transaction is only slightly  below the trigger price,  we
          would not be  required  to issue a  substantial  number of  additional
          shares to the investors.

                                      -15-
<PAGE>

     *    We agreed that if, during the twelve months ending  December 31, 2000,
          we desire to conduct a private  placement of our securities  through a
          placement  agent,  broker-dealer  or  finder,  we will  give an entity
          associated  with the investors in the December 1999  financing a right
          of first refusal to serve as the placement agent in that  transaction.
          This right was waived in connection with our February 2000 financing.

         These  covenants  will cease to apply at such time as the  investors in
the December 1999 financing and their  affiliates  beneficially own less than 5%
of our common stock.  As of February 18, 2000,  such  investors in the aggregate
beneficially  owned 6.4% of our outstanding  common stock. Prior to the time, if
ever,  when the  investors'  equity  interest  falls below 5%, the investors may
waive any one or more of the  covenants  set forth in our Common Stock  Purchase
Agreement.

                  In  connection  with the execution of our December 1999 Common
Stock  Purchase  Agreement,  our executive  officers and directors  agreed that,
subject to a limited  carve-out,  they would not sell any shares of their common
stock until June 14, 2000. We also agreed to refrain from  publicly  offering or
selling our shares  before March 28, 2000.  The  investors in the December  1999
financing  may  waive  these  restrictions  at any  time and  have  waived  such
restrictions  for  purposes of enabling us to file this  prospectus.  One of our
directors,  Dr.  Morton  Coleman,  is eligible  to sell shares  pursuant to this
prospectus. See "Selling Stockholders."

                                 USE OF PROCEEDS

         We will not receive any  proceeds  from the sale of our common stock by
the  selling  stockholders.  However,  we did  receive  gross  proceeds of $37.2
million from the  issuance of our common stock to the  investors in the February
2000  financing.  We estimate  that the net proceeds  from that issuance will be
approximately  $35.5  million.  We intend to use the net proceeds for continuing
research and  development  for our existing  product line,  for future  clinical
trials,  for  general  working  capital  purposes  and in the  operation  of our
business.

                                      -16-
<PAGE>


                              SELLING STOCKHOLDERS

         The table below presents the following  information:  (1) the number of
shares of common  stock  beneficially  owned by each selling  stockholder  as of
February 18, 2000,  1999; (2) the number of shares that the selling  stockholder
is offering under this prospectus, and (3) the number of shares that the selling
stockholder  will  beneficially  own  after  the  completion  of this  offering,
assuming that the selling  stockholder  does not acquire any other shares of our
common stock  subsequent  to February  18,  2000.  The number of shares shown as
being beneficially owned by each selling  stockholder after the offering assumes
that the selling  stockholder  has sold all the shares of our common stock which
may be sold pursuant to this prospectus.

         The number and percentage of shares  beneficially owned by each selling
stockholder is determined as of the date of this  prospectus in accordance  with
Rule  13d-3  of  the  Securities  Exchange  Act,  and  the  information  is  not
necessarily indicative of beneficial ownership for any other purpose. Under this
rule,  beneficial  ownership  includes  any  shares  as  to  which  the  selling
stockholder  has sole or shared  voting power or  investment  power and also any
shares which the selling  stockholder has the right to acquire within 60 days of
the date of this prospectus through the exercise of any stock option, warrant or
other right. [Unless otherwise indicated in the footnotes,] each person has sole
voting and  investment  power with respect to the shares  shown as  beneficially
owned.

         None of the selling  stockholders has had a material  relationship with
us  within  the  past  three  years,   other  than  as  described   above  under
"Immunomedics - February 2000 Financing; Covenants", subject to the following:

*    Dr. Morton Coleman is a member of our Board of Directors; and

*    the Aires funds were also  purchasers  in our December  1999  financing and
     thus are  entitled to the  benefits of the  covenants  that we agreed to at
     that time.

                                [to be completed]
<TABLE>
<CAPTION>

                                           Shares of Common Stock                                Shares of Common Stock
                                           Beneficially Owned as     Shares of Common           Beneficially Owned After
Selling Stockholder                         of February 18, 2000     Stock Being Offered              the Offering
- -------------------                        ----------------------    -------------------        ------------------------
<S>                                        <C>                       <C>                        <C>

DCF Capital L.P.                                                                75,000
DCF Life Sciences Fund LTD                                                      25,000
Dresdner RCM Global Investor                                                   200,000
Franklin Templeton Group                                                       300,000
Global Lifesciences Fund                                                       749,375
Aspen Global Life Sciences Fund                                                    625
JMG Capital                                                                     75,000
Moore Global Investments, Ltd.                        255,900                  160,000                  95,900
Remington Investment Strategies, L.P.                  64,000                   40,000                  24,000
Palantir Capital                                                               100,000
Beacon Funds                                                                    75,000
1st New York Securities                                                         75,000
Westcliff Master Fund L.P.                                                      40,530
Westcliff Partners L.P.                                                         33,470
Westcliff Partners SA L.P.                                                       8,300
Westcliff Long/Short L.P.                                                        9,940
Westcliff Small Cap Fund L.P.                                                    7,760
Samuel Lupin, M.D.                                                              17,000
</TABLE>

                                      -17-
<PAGE>
<TABLE>
<CAPTION>
<S>                                        <C>                       <C>                        <C>
F/B/O Arnold M. Lupin IRA                             32,000                    25,000                  7,000
Lupin Foundation                                      15,000                    15,000                    -
Sontag Partners                                                                 10,000
Robert D. Marcus, M.D.                                10,000                    10,000                    -
E. Ralph Lupin, M.D.                                    3,000                    3,000                    -
Fagey Lupin Fischman                                  10,000                    10,000                    -
Taylor - Schabelman Group                                                        5,000
Taylor - Schabelman Group                                                        5,000
Morton Coleman, M.D.                                  104,000                  104,000                    -
Robert M. Gelfand, M.D.                               30,000                    20,000                  10,000
Mark Pasmentier, M.D.                                  6,000                     6,000                    -
Mark Goldblatt                                                                  20,000
Aires Domestic Fund, L.P.                             834,447                   30,482                 803,965
Aires Domestic Fund II, L.P.                          145,960                    5,139                 140,821
The Aires Master Fund                                1,996,161                  64,379                1,931,782
                                                                               -----------

TOTAL:                                                                           2,325,000
                                                                               ============
</TABLE>

                              PLAN OF DISTRIBUTION

Manner of Sales; Broker-Dealer Compensation

         The selling stockholders,  or any successors in interest to the selling
stockholders,  may sell any  shares  of our  common  stock  that  they  acquired
pursuant to our February 14, 2000 Common Stock Purchase  Agreement.  The sale of
our common stock may be effected in one or more of the following methods:

*    ordinary brokers' transactions;

*    transactions  involving  cross or block  trades or  otherwise on the Nasdaq
     National Market;

*    purchases by brokers,  dealers or  underwriters  as principal and resale by
     these purchasers for their own accounts pursuant to this prospectus;

*    "at the market" to or through market makers or into an existing  market for
     our common stock;

*    in other ways not involving  market makers or established  trading markets,
     including direct sales to purchasers or sales effected through agents;

*    through  transactions  in  options,  swaps  or other  derivatives  (whether
     exchange-listed or otherwise);

*    in privately negotiated transactions;

*    to cover  short  sales,  except  to the  extent  that  they are  restricted
     contractually from doing so; or

*    any combination of the foregoing.

The selling  stockholders  also may sell their shares in reliance  upon Rule 144
under the Securities Act at such times as they are eligible to do so.

                                      -18-
<PAGE>

         We have been  advised by the  selling  stockholders  that they have not
made any  arrangements  for the  distribution  of the  shares of  common  stock.
Brokers,  dealers or underwriters who effect sales for the selling  stockholders
may arrange for other brokers, dealers or underwriters to participate.  Brokers,
dealers  or  underwriters  engaged  by the  selling  stockholders  will  receive
commissions  or  discounts  from them in amounts to be  negotiated  prior to the
sale. These brokers, dealers or underwriters may act as agent or as principals.

         From time to time, one or more of the selling  stockholders may pledge,
hypothecate or grant a security  interest in some or all of the shares of common
stock  acquired by them,  and the pledgees,  secured  parties or persons to whom
these  securities  have been pledged  shall,  upon  foreclosure  in the event of
default, be considered a selling stockholders hereunder. In addition, subject to
contractual  limitations,  a selling  stockholder  may, from time to time,  sell
short our common stock. In these instances,  this prospectus may be delivered in
connection with these short sales.

         From time to time one or more of the selling stockholders may transfer,
pledge,  donate or assign shares of our common stock that it acquired to lenders
or others and each of these persons will be considered a selling stockholder for
purposes  of  this  prospectus.  The  number  of  shares  of  our  common  stock
beneficially owned by those selling stockholders who so transfer, pledge, donate
or assign  shares of our common stock will  decrease as and when they take these
actions.  The  plan  of  distribution  for  our  common  stock  by  the  selling
stockholders set forth herein will otherwise remain  unchanged,  except that the
transferees,  pledgees,  donees or other  successors will be considered  selling
stockholders hereunder.

         Subject to contractual  limitations,  a selling  stockholder  may enter
into hedging  transactions with broker-dealers and the broker-dealers may engage
in short sales of our common stock in the course of hedging the  positions  they
assume with this selling stockholder, including in connection with distributions
of our common  stock by these  broker-dealers.  A selling  stockholder  may also
enter into option or other  transactions  with  broker-dealers  that involve the
delivery  of our  common  stock to the  broker-dealers,  who may then  resell or
otherwise  transfer these shares. A selling  stockholder also may loan or pledge
our common stock to a broker-dealer  and the  broker-dealer  may sell our common
stock so loaned or upon a default  may sell or  otherwise  transfer  the pledged
common stock.

Filing of a Post-Effective Amendment In Certain Instances

         If any  selling  stockholder  notifies  us that it has  entered  into a
material arrangement (other than a customary brokerage account agreement) with a
broker or dealer for the sale of shares of common  stock  under this  prospectus
through a block trade, purchase by a broker or dealer or similar transaction, we
will file a post- effective  amendment to the  registration  statement under the
Securities Act. The post-effective amendment will disclose:

*    The name of each broker-dealer involved in the transaction.

*    The number of shares of common stock involved.

*    The price at which those shares of common stock were sold.

*    The   commissions   paid  or  discounts  or  concessions   allowed  to  the
     broker-dealer(s).

*    If   applicable,   that  these   broker-dealer(s)   did  not   conduct  any
     investigation  to verify  the  information  contained  or  incorporated  by
     reference in this prospectus, as supplemented.

*    Any other facts material to the transaction.

                                      -19-
<PAGE>

Certain Persons May Be Deemed to Be Underwriters

         The selling  stockholders and any  broker-dealers who execute sales for
them may be deemed to be "underwriters" within the meaning of the Securities Act
because  of the  number of shares of common  stock to be sold or resold by these
persons or entities or the manner of sale of these shares, or both. If a selling
stockholder  or  any  broker-dealer  or  other  holders  were  determined  to be
underwriters,  any discounts,  concessions or commissions received by them or by
brokers or dealers  acting on their  behalf and any profits  received by them on
the resale of their  shares of common  stock might be deemed to be  underwriting
discounts and commissions under the Securities Act.

Regulation M

         We have informed the selling stockholders that Regulation M promulgated
under the Securities  Exchange Act may be applicable to them with respect to any
purchase or sale our common  stock.  In  general,  Rule 102 under  Regulation  M
prohibits  any person  connected  with a  distribution  of our common stock from
directly or indirectly  bidding for, or  purchasing  for any account in which it
has a beneficial interest,  any of our common stock or any right to purchase our
common  stock,  for a period of one business day before and after  completion of
its participation in the distribution.

         During any  distribution  period,  Regulation  M prohibits  the selling
stockholders and any other persons engaged in the distribution  from engaging in
any  stabilizing  bid or  purchasing  our common stock except for the purpose of
preventing  or retarding a decline in the open market price of our common stock.
None of these persons may effect any  stabilizing  transaction to facilitate any
offering  at the market.  As the selling  stockholders  will be  reoffering  and
reselling  our common stock at the market,  Regulation M will prohibit them from
effecting any  stabilizing  transaction  in  contravention  of Regulation M with
respect to our common stock.

Indemnification and Other Matters

         We paid all of the expenses incident to the registration,  offering and
sale of our common  stock by the selling  stockholders  to the public other than
commissions or discounts of underwriters, broker-dealers or agents. We also have
agreed to indemnify the selling stockholders and certain related persons against
certain liabilities,  including liabilities under the Securities Act. Insofar as
indemnification  for  liabilities  arising  under  the  Securities  Act  may  be
permitted to our  directors,  officers  and  controlling  persons,  we have been
advised that in the opinion of the SEC this indemnification agreement is against
public  policy  as  expressed  in  the   Securities   Act  and  is,   therefore,
unenforceable.

         This  offering will  terminate on the date on which all shares  offered
hereby have been sold by the selling stockholders.

                                  LEGAL MATTERS

         Lowenstein  Sandler  PC will give its  opinion on the  validity  of the
common stock.

                                     EXPERTS

         Our consolidated financial statements as of June 30, 1999 and 1998, and
for each of the years in the  three-year  period  ended June 30,  1999 have been
incorporated by reference herein and in the  registration  statement in reliance
upon  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.

                                      -20-
<PAGE>

                                     PART II

                     INFORMATION NOT REQUIRED IN PROSPECTUS

Item 14.  Other Expenses of Issuance and Distribution.

The following is an itemized  statement of the estimated amounts of all expenses
payable by us in connection with the registration of the Shares:

SEC registration fee..................................................   $15,998
Legal fees and expenses...............................................    10,000
Accounting fees and expenses..........................................     2,500
Miscellaneous expenses................................................     1,502
                                                                           -----
           Total......................................................   $30,000
           ======

Item 15.  Indemnification of Directors and Officers.

         The Delaware  General  Corporation  Law provides,  in  substance,  that
Delaware  corporations shall have the power, under specified  circumstances,  to
indemnify  their  directors,  officers,  employees and agents in connection with
actions  or suits by or in the right of the  corporation,  by reason of the fact
that they were or are such directors,  officers,  employees and agents,  against
expenses  (including  attorneys'  fees) and,  in the case of  actions,  suits or
proceedings brought by third parties, against judgments,  fines and amounts paid
in  settlement  actually and  reasonably  incurred in any such  action,  suit or
proceeding.

         The Company's  Certificate  of  Incorporation  provides that a director
shall not be personally  liable to the Company or its  stockholders for monetary
damages for breach of fiduciary duty as a director  except for liability (i) for
breach of the  director's  duty of loyalty to the  Company or its  stockholders,
(ii) for acts or  omissions  not in good  faith  or  which  involve  intentional
misconduct  or a  knowing  violation  of law,  (iii)  under  Section  174 of the
Delaware  General  Corporation  Law, or (iv) for any transaction  from which the
director derived an improper personal benefit. The Company's Bylaws also provide
that the Company may indemnify its directors, officers and legal representatives
to the fullest extent  permitted by Delaware law against all awards and expenses
(including attorneys' fees).

Item 16.   Exhibits.

Exhibit No.             Description

4.1             -      Common Stock Purchase Agreement, dated as of February 14,
                       2000, by and among the Company and the investors named
                       therein.

5.1             -      Opinion of Lowenstein Sandler PC

23.1            -      Consent of KPMG LLP.

23.2            -      Consent of Lowenstein Sandler PC
                       (included in their opinion filed as Exhibit 5.1).

24.1            -      Power of Attorney (included on the signature page).

                                      II-1
<PAGE>

Item 17.  Undertakings.

         The Company hereby  undertakes  that,  for purposes of determining  any
liability under the Securities Act of 1933, each filing of the Company'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 therein,  and the
offering of such  securities at that time shall be deemed to be the initial bona
fide offering thereof.

         The Company undertakes that it will:

               (1)  File,  during  any  period  in  which  it  offers  or  sells
               securities,  a  post-effective  amendment  to  this  registration
               statement to:

                    (i) Include any prospectus  required by section  10(a)(3) of
               the Securities Act;

                    (ii) Reflect in the  prospectus  any facts or events  which,
               individually or together,  represent a fundamental  change in the
               information in the registration statement.

               Notwithstanding the foregoing, any increase or decrease in volume
               of  securities  offered (if the total dollar value of  securities
               offered  would not  exceed  that  which was  registered)  and any
               deviation  from  the low or  high  end of the  estimated  maximum
               offering  range may be reflected in the form of prospectus  filed
               with the Commission pursuant to Rule 424(b) if, in the aggregate,
               the  changes  in volume  and price  represent  no more than a 20%
               change in the maximum  aggregate  offering price set forth in the
               "Calculation  of   Registration   Fee"  table  in  the  effective
               registration statement.

                    (iii) Include any material  information  with respect to the
               plan of distribution not previously disclosed in the registration
               statement  or any  material  changes to such  information  in the
               registration statement,

               provided,  however,  that the  Company  does not need to give the
               statements  in  paragraph  (1)(i) and (1)(ii) if the  information
               required  in  a  post-effective   amendment  is  incorporated  by
               reference  from  periodic  reports filed by the Company under the
               Exchange Act.

               (2) For  determining  liability  under the Securities  Act, treat
               each post-effective  amendment as a new registration statement of
               the  securities  offered,  and the offering of the  securities at
               that time to be the initial bona fide offering.

               (3) File a post-effective  amendment to remove from  registration
               any  of the  securities  that  remain  unsold  at the  end of the
               offering.

         Insofar as indemnification for liabilities arising under the Securities
Act of 1933 (the "Act") may be permitted to directors,  officers and controlling
persons of the Company pursuant to the foregoing provisions,  or otherwise,  the
Company has been  advised  that in the opinion of the  Securities  and  Exchange
Commission such indemnification is against public policy as expressed in the Act
and is, therefore,  unenforceable. In the event that a claim for indemnification
against  such  liabilities  (other  than the  payment by the Company of expenses
incurred or paid by a director,  officer or controlling person of the Company 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 Company  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.

                                      11-2
<PAGE>



                                   SIGNATURES

         Pursuant  to the  requirements  of the  Securities  Act  of  1933,  the
Registrant  certifies that it has reasonable  grounds to believe 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 Morris Plains,  State of New Jersey, on February 24,
2000.

                                               IMMUNOMEDICS, INC.


                                               By: /s/ David M. Goldenberg
                                                   -----------------------------
                                                   David M. Goldenberg
                                                   Chairman of the Board and
                                                   Chief Executive Officer
                                                   (Principal Executive Officer)

         Each person whose  signature  appears  below  constitutes  and appoints
David M.  Goldenberg,  Cynthia  Sullivan and Shailesh R. Asher and each of them,
his or her true and lawful attorney-in-fact, with full power of substitution and
resubstitution,  for him or her and in his or her name,  place and stead, in any
and all  capacities  to sign any and all  amendments,  including  post-effective
amendments,  to this  Registration  Statement,  and to file the  same,  with all
exhibits  thereto,  and  other  documents  in  connection  therewith,  with  the
Securities and Exchange  Commission  under the  Securities  Act of 1933,  hereby
ratifying and confirming  all that said  attorneys-in-fact  or  substitutes  may
lawfully do or cause to be done by virtue thereof.

         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.

Dated:

February 24, 2000                                  /s/ David M. Goldenberg
                                                   -----------------------------
                                                   David M. Goldenberg, Chairman
                                                   of the Board, Chief Executive
                                                   Officer and a Director
                                                   (Principal Executive Officer)

February 24, 2000                                  /s/ Morton Coleman
                                                   -----------------------------
                                                   Morton Coleman, Director

February   , 2000
                                                   -----------------------------
                                                   Marvin E. Jaffe, Director


February 24, 2000                                  /s/ Richard R. Pivirotto
                                                   -----------------------------
                                                   Richard R. Pivirotto,
                                                   Director

February 24, 2000                                  /s/ Richard C. Williams
                                                   -----------------------------
                                                   Richard C. Williams, Director

February 24, 2000                                  /s/ Shailesh R. Asher
                                                   -----------------------------
                                                   Shailesh R. Asher, Controller
                                                   and Acting Chief Financial
                                                   Officer (Principal Financial
                                                   and Accounting Officer)

                                      II-3
<PAGE>



                                  EXHIBIT INDEX

       4.1     Common Stock Purchase  Agreement,  dated as of February 14, 2000,
               by and among the Company and the investors named therein

       5.1     Opinion of Lowenstein Sandler LP

       23.1    Consent of KPMG LLP.



                                      II-4
<PAGE>

                                    This   COMMON   STOCK   PRIVATE    PLACEMENT
                           AGREEMENT (the  "Agreement") has been entered into as
                           of  February  14,  2000,  by and among  IMMUNOMEDICS,
                           INC., a Delaware corporation (the "Company"), and the
                           PURCHASERS   listed  on  Exhibit  A  (individually  a
                           "Purchaser" and collectively the "Purchasers").

                  This  Agreement has been executed by the parties in connection
with the  private  placement  of shares of Common  Stock (the  "Shares")  of the
Company. The parties hereby agree as follows:

1.       Agreement to Subscribe; Payment; Subscription Irrevocable.
         ---------------------------------------------------------
          (a)  Each Purchaser  hereby  subscribes for the number of Shares shown
               on  Exhibit  A next to its name at a price of  $16.00  per  Share
               payable to the Company;
          (b)  Payment  for the  Shares  shall  take  place no later  than three
               business days after the execution and delivery of this  Agreement
               (the  "Closing").  The Closing  will take place at the offices of
               Sutro & Co., Inc. (the  "Placement  Agent") at 11150 Santa Monica
               Blvd.,  Los Angeles,  CA. At the Closing the Company will deliver
               to the  Purchasers  the Shares  against  payment of the aggregate
               purchase price by wire transfer payable to the Placement Agent on
               behalf  of the  Company  pursuant  to the  instructions  shown on
               Exhibit B. The Shares shall be registered in  Purchasers'  names,
               or the names of designated  nominees,  in such  denominations  as
               shown in Exhibit A.
          (c)  Each  Purchaser  understands  that,  except as  provided  in this
               Agreement,  this  subscription may not be revoked by a Purchaser,
               and that the  execution and delivery of this  Agreement  will not
               constitute  an agreement  between the  Purchaser  and the Company
               until this  Agreement has been accepted by the Company,  and then
               subject to the terms and conditions of this Agreement.

2.       Qualifications of Investor.
         --------------------------
          (a)  Accredited  Investor Status. Each Purchaser hereby represents and
               warrants to the Company that it is an accredited  investor within
               the meaning of Regulation D  promulgated  by the  Securities  and
               Exchange Commission (the "SEC")
          (b)  Each Purchaser represents and warrants that:
               (i)  It has not been formed,  reformed or  recapitalized  for the
                    specific purpose of purchasing the Shares;
               (ii) It has been duly  formed  and is  validly  existing  in good
                    standing  under  the  laws  of  the   jurisdiction   of  its
                    formation,  with full power and  authority to enter into the
                    transactions contemplated by this Agreement; and
               (iii)This  Agreement  has  been  duly  and  validly   authorized,
                    executed,   and  delivered  by  it  and  when  executed  and
                    delivered by the Company, will constitute the valid, binding
                    and enforceable agreement of the Purchaser.

<PAGE>

3.       Independent Investigation.
         -------------------------
          (a)  Independent Investigation. Each Purchaser, in making the decision
               to  purchase   the  Shares   subscribed   for,  has  relied  upon
               independent  investigation  made  by it and  its  representatives
               which  it  deems  to be  adequate  and  they  have  reviewed  the
               Company's  Form 10Q for the quarter ended  September 30, 1999 and
               the pertinent parts of the Company's S-3  Registration  Statement
               filed with the SEC on January 11, 2000.
          (b)  No  Governmental  Recommendation  or  Approval.  The  undersigned
               understands that no federal or state agency has passed on or made
               any recommendation or endorsement of the Shares.

         THE SHARES HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933 OR
         THE  SECURITIES  LAWS OF ANY STATE AND  THERE ARE  RESTRICTIONS  ON THE
         TRANSFERABILITY OF THE SHARES.

4.       Investment Representations.
         --------------------------
          (a)  Shares Not  Registered;  Indefinite  Holding.  Each Purchaser has
               been advised by the Company,  and understands,  that it must bear
               the  economic  risk  of  an  investment  in  the  Shares  for  an
               indefinite  period of time  because  the Shares have not yet been
               registered under the Securities Act.  Therefore,  the Shares must
               be held by the Purchaser until they are  subsequently  registered
               under the Securities  Act or an exemption from such  registration
               is available for the transfer of the Shares.
          (b)  Purchase  for own Account.  Each  Purchaser  represents  that the
               Shares  are  being  acquired  solely  for  its  own  account  for
               investment  and  not  with  a  view  toward,  or  for  resale  in
               connection with, any  "distribution" (as that term is used in the
               Securities Act and its Rules and Regulations) of any Shares.
          (c)  No Disposition of Shares Without Securities Law Compliance.  Each
               Purchaser  agrees not to subdivide the Shares or to offer,  sell,
               pledge,  hypothecate  or otherwise  transfer or dispose of any of
               the Shares in the absence of an effective  registration statement
               under the Securities Act covering such disposition, or an opinion
               of counsel,  satisfactory to the Company and its counsel,  to the
               effect that registration under the Securities Act is not required
               in respect of such transfer or disposition.
          (d)  Stop-Transfer and Legends on Certificates. Each Purchaser further
               understands  that a  stop-transfer  order  will be  placed on the
               stock-transfer  books of the Company  respecting the certificates
               evidencing the Shares,  and such  certificates  shall bear, until
               such time as the  Shares  shall  have been  registered  under the
               Securities Act or shall have been  transferred in accordance with
               such  an  opinion  of  counsel,  the  following  legend  (or  one
               substantially similar).

         THE SHARES  REPRESENTED BY THIS  CERTIFICATE  HAVE NOT BEEN  REGISTERED
         UNDER THE  SECURITIES  ACT OF 1933, AS AMENDED,  AND MAY NOT BE SOLD OR
         TRANSFERRED IN THE ABSENCE OF AN EFFECTIVE REGISTRATION STATEMENT UNDER
         SAID ACT, OR AN AVAILABLE EXEMPTION THEREUNDER.

               plus any legend that may be required under any  applicable  state
               law.

                                      -2-

<PAGE>

          (e)  "Private Offering"  Exemption;  Reliance on Representations.  The
               undersigned understands that the offer and sale of the Shares are
               not being  registered under the Securities Act in reliance on the
               so-called "private  offering"  exemption provided by Section 4(2)
               of the Securities Act and/or Regulation D promulgated pursuant to
               the  Securities  Act, and that the Company is basing its reliance
               on that  exemption  in part on the  representations,  warranties,
               statements and agreements contained in this Agreement.

5.       Indemnification.
         ----------------
         Each Purchaser agrees to indemnify and hold the Company,  its officers,
         directors  and  stockholders  or any other  person who may be deemed to
         control the Company harmless from any loss, liability, claim, damage or
         expense,   arising  out  of  the   inaccuracy   of  any  of  the  above
         representations,  warranties  or statements or the breach of any of the
         agreements contained in this Agreement,  and this indemnification shall
         survive the purchase and sale of the Shares.

6.       Conditions to the Company's Obligation to Sell.
         ----------------------------------------------
         Each Purchaser  understands  that the Company's  obligation to sell the
Shares is conditioned upon:

          (a)  the receipt  and  acceptance  by the Company of a fully  executed
               Agreement for all of the Shares to be purchased in the particular
               offering (i.e.,  either the initial  offering of a minimum of 1.5
               million Shares or any subsequent  offerings of up to an aggregate
               of an additional 500,000 Shares);  and
          (b)  No injunction, order, investigation,  claim, action or proceeding
               before  any  court  or  governmental  body  shall be  pending  or
               threatened wherein an unfavorable judgment, decree or order would
               restrain, impair or prevent the carrying out of this Agreement or
               any of the transactions  contemplated  thereby,  declare unlawful
               the transactions contemplated by this Agreement or cause any such
               transaction to be rescinded.

7.       Conditions to Purchasers' Obligation to Purchase.
         ------------------------------------------------
         Purchasers'  obligation  to purchase the Stock in  accordance  with the
terms of this Agreement is conditioned  upon:

          (a)  Purchasers shall have received from STARR, GERN, DAVISON & RUBIN,
               counsel for the  Company,  its opinion  dated the Closing Date in
               the form of Exhibit C; and
          (b)  All  of  the   representations  and  warranties  of  the  Company
               contained in this  Agreement  shall be true and correct at and as
               of the Closing Date; and
          (c)  No injunction, order, investigation,  claim, action or proceeding
               before  any  court  or  governmental  body  shall be  pending  or
               threatened wherein an unfavorable judgment, decree or order would
               restrain, impair or prevent the carrying out of this Agreement or
               any  of  the  contemplated  transactions,  declare  unlawful  the
               transactions  contemplated  by this  Agreement  or cause any such
               transaction to be rescinded;
          (d)  The Company shall have delivered to Purchasers the following:
               (i)  a  certificate  of the  Secretary of the Company,  dated the
                    Closing Date, as to the continued and valid existence of the
                    Company,  certifying the attached copy of the By-laws of the
                    Company,  the  authorization of the execution,  delivery and
                    performance of this Agreement,  and the resolutions  adopted
                    by the Board of  Directors  of the Company  authorizing  the
                    actions to be taken by the Company under this Agreement;

                                      -3-

<PAGE>

               (ii) a  certificate  of the  Secretary  of State of the  State of
                    Delaware,  dated a  recent  date,  to the  effect  that  the
                    Company is in good  standing  in the State of  Delaware  and
                    that all annual reports, if any, have been filed as required
                    and, if readily  available that all franchise taxes and fees
                    have been paid in connection therewith;
               (iii)a certified copy of the Certificate of  Incorporation of the
                    Company as filed with the Secretary of State of the State of
                    Delaware, including any amendments thereto; and
          (e)  The Company shall have  received  from these  certain  Purchasers
               pursuant to an  Agreement  dated as of December  15, 1999 between
               those  Purchasers and the Company,  their written  consent to the
               filing of the Shelf Registration  Statement  described in Section
               10 below.

8.       Representations and Warranties of the Company.
         ---------------------------------------------
         The representations and warranties of the Company in this Agreement are
         subject to and qualified by the disclosures  made in the Company's most
         recent Annual Report on Form 10-K and Quarterly Report on Form 10-Q, as
         filed with the SEC (the "SEC Documents"). The Company hereby represents
         and warrants to each Purchaser as of the Closing as follows:

          (a)  Organization.  The  Company  is  a  corporation  duly  organized,
               validly existing and in good standing under the laws of the State
               of  Delaware.  The  Company  is  eligible  to be  treated  as a C
               corporation  under the Internal  Revenue Code of 1986, as amended
               (the "Code").  The Company has all requisite  corporate power and
               authority,  and holds all  licenses,  permits and other  required
               authorizations  from  governmental   authorities,   necessary  to
               conduct  its  business as now being  conducted  or proposed to be
               conducted and to own or lease the properties and assets now owned
               or held under license or lease.  The Company is duly qualified or
               licensed and in good  standing as a foreign  corporation  in each
               jurisdiction  wherein  the  character  of its  properties  or the
               nature of the activities conducted by it makes such qualification
               or  licensing  necessary,  except where the failure to so qualify
               would not have a material adverse effect on the Company.
          (b)  Capitalization.  As of January 11, 2000, the Company's authorized
               capitalization  consists of 70,000,000 shares of Common Stock, of
               which  43,655,709   shares  are  issued  and   outstanding,   and
               10,000,000  shares of preferred  stock,  par value $.01 per share
               (of which 595.5  shares are  designated  as Series F  Convertible
               Preferred  Stock but none of which are issued  and  outstanding).
               15,022,288  shares of Common Stock are reserved for issuance upon
               the  conversion or exercise of convertible  securities,  options,
               warrants or other rights to purchase Common Stock  outstanding as
               of the Closing Date.  All  outstanding  securities of the Company
               are validly issued, fully paid and nonassessable.  No stockholder
               of the Company is entitled to any preemptive  rights with respect

                                      -4-

<PAGE>
               to the purchase or sale of any  securities by the Company.  There
               are no outstanding options, warrants or other rights, commitments
               or  arrangements,  written  or oral,  to  purchase  or  otherwise
               acquire any  authorized  but unissued  shares of capital stock of
               the Company or any security  directly or  indirectly  convertible
               into or  exchangeable  for any  capital  stock of the  Company or
               under which any such option,  warrant or convertible security may
               be issued in the future except otherwise as set forth on Schedule
               8(b).  There are no voting  trusts or  agreements,  stockholders'
               agreements,  pledge agreements,  buy-sell, rights of first offer,
               negotiation  or  refusal  or  proxies  or  similar   arrangements
               relating to any securities of the Company to which the Company is
               a party,  and to the best  knowledge  of the  Company  after  due
               inquiry  there  are no  other  such  trusts,  agreement,  rights,
               proxies or similar arrangements. Except as otherwise set forth on
               Schedule 8(b) or as contemplated  by this Agreement,  none of the
               shares  of  capital  stock of the  Company  is  reserved  for any
               purpose,  and the  Company is neither  subject to any  obligation
               (contingent  or  otherwise),  nor has any option to repurchase or
               otherwise  acquire or retire any shares of its capital stock. (c)
               Due  Authorization,   Valid  Issuance,  Etc.  The  Shares  to  be
               purchased on the Closing Date have been duly authorized and, when
               issued in accordance  with this  Agreement upon the Closing Date,
               will be validly issued, fully paid and non-assessable and will be
               free and clear of all liens  imposed by or through  the  Company,
               subject only to restrictions set forth herein, as applicable,  or
               applicable federal and state securities laws. The issuance,  sale
               and  delivery  of  such  Shares,  will  not  be  subject  to  any
               preemptive  right of  stockholders of the Company or to any right
               of first  refusal or other right in favor of any person or entity
               except for provisions  which have been waived or satisfied and as
               set forth on Schedule 8(c).
          (d)  Subsidiaries.  The  Company  has no  wholly  or  partially  owned
               Subsidiaries  and does not control,  directly or indirectly,  any
               other   corporation,    business   trust,   firm,    partnership,
               association, joint venture, entity or organization. Except as set
               forth on Schedule  8(d),  the Company  does not own any shares of
               stock,  partnership interest, joint venture interest or any other
               security,  equity or interest in any other  corporation  or other
               Person.
          (e)  Company  Power.  The  Company  has the full  corporate  power and
               authority to execute,  deliver and enter into this  Agreement and
               to perform  its  obligations,  and the  execution,  delivery  and
               performance  of  this   Agreement  and  all  other   contemplated
               transactions  have  been duly  authorized  by the  Company.  This
               Agreement  constitutes a legal,  valid and binding  obligation of
               the  Company,   which  is  not  in  contravention  of  any  other
               agreements of the Company,  and this  Agreement is enforceable in
               accordance  with its terms except as such  enforceability  may be
               limited by (a)  bankruptcy,  insolvency,  moratorium  and similar
               laws   affecting   creditors'   rights   generally  and  (b)  the
               availability of remedies under general equitable principles.
          (f)  No Material Adverse Change.  Since September 30, 1999,  except as
               disclosed on Schedule 8(f) there has not at any time been (a) any
               material  adverse  change in the business,  financial  condition,
               operating  results,  business  prospects,  employee  relations or
               customer relations of the Company,  or (b) other adverse changes,
               which  in the  aggregate  have  been  materially  adverse  to the
               Company.  Except  as set  forth  on  Schedule  8(f),  no event or

                                      -5-

<PAGE>

               circumstance  has  occurred or exists with respect to the Company
               or its business, properties,  prospects,  operations or financial
               condition,  which,  under  applicable  law,  rule or  regulation,
               requires  public  disclosure or  announcement  by the Company but
               which has not been so publicly announced or disclosed.
          (g)  Disclosure.  Neither  this  Agreement  nor any of the  schedules,
               exhibits, written statements,  documents or certificates prepared
               or  supplied  by the  Company  with  respect to the  transactions
               contemplated by this  Agreement,  nor any document filed with the
               Securities and Exchange  Commission after January 1, 1999 contain
               any untrue  statement of a material  fact or omit a material fact
               necessary to make the statements contained therein not misleading
               in  light of the  circumstances  under  which  made.  Except  for
               general factors that are common in the market and industry of the
               Company,  there exists no fact or circumstance which, to the best
               knowledge of the Company after due inquiry,  materially adversely
               affects,  or which  could  reasonably  be  anticipated  to have a
               material  adverse  effect on, the existing or expected  financial
               condition,   operating  results,   assets,   customer  relations,
               employee relations or business prospects of the Company.
          (h)  Absence of Certain  Developments.  Except as contemplated by this
               Agreement,  and  except  as set  forth  on  Schedule  8(h)  since
               September  30, 1999 the  Company has not,  nor will have prior to
               the  Closing  Date:  (i) issued  any  securities  (other  than as
               permitted or contemplated by this  Agreement);  (ii) borrowed any
               amount or incurred or became subject to any liabilities (absolute
               or  contingent)   which  involve  $50,000  or  more,  other  than
               liabilities  incurred  in the  ordinary  course of  business  and
               liabilities  under contracts  entered into in the ordinary course
               of business;  (iii)  discharged  or satisfied  any lien,  adverse
               claim  or   encumbrance  or  paid  any  obligation  or  liability
               (absolute or contingent),  other than current liabilities paid in
               the  ordinary  course  of  business;  (iv)  declared  or made any
               payment  or  distribution  of  cash  or  other  property  to  the
               stockholders  of the Company  with respect to the Common Stock or
               purchased or redeemed any shares of Common Stock;  (v) mortgaged,
               pledged or subjected to any lien,  adverse  claim,  charge or any
               other  encumbrance,  any of its properties or assets,  except for
               liens for taxes not yet due and payable;  (vi) sold,  assigned or
               transferred any of its assets, tangible or intangible,  except in
               the  ordinary  course  of  business  and in an  amount  less than
               $50,000,  or disclosed to any person,  firm or entity not subject
               to a confidentiality  obligation with the Company any proprietary
               confidential information; (vii) suffered any extraordinary losses
               or waived any rights of material value; (viii) made any change in
               the nature or operations of the business of the Company;  or (ix)
               resolved or entered  into any  agreement  or  understanding  with
               respect to any of the foregoing.
          (i)  Properties.  The Company has good and marketable  title to all of
               the real property and good title to all of the personal  property
               and  assets  it  purports  to own as set  forth in the  Financial
               Statements,  whether such property is real or personal,  free and
               clear of all liens,  adverse  claims,  charges,  encumbrances  or
               restrictions  of any  nature  whatsoever,  except (a) such as are
               reflected  on  Schedule  8(i),  (b) for  receivables  and charges
               collected in the ordinary  course of business and (c)  immaterial
               exceptions of a routine and customary nature. The Company owns or
               leases all such  properties as are necessary to its operations as
               now conducted  and as presently  proposed to be conducted and all
               such properties are, in all material respects,  in good operating
               condition and repair.

                                      -6-
<PAGE>

          (j)  Taxes.  Except as set forth on  Schedule  8(j),  the  Company has
               timely  filed all federal,  state,  local and foreign tax returns
               and  reports  required  to  be  filed,   and  all  taxes,   fees,
               assessments and governmental  charges of any nature shown by such
               returns and  reports to be due and payable  have been timely paid
               except for those  amounts  being  contested in good faith and for
               which  appropriate  amounts have been reserved in accordance with
               generally  accepted  accounting  principles.   There  is  no  tax
               deficiency  that  has  been,  or,  to the best  knowledge  of the
               Company after due inquiry might be, asserted  against the Company
               that  would  adversely  affect the  business  or  operations,  or
               proposed  business or  operations,  of the Company.  All such tax
               returns and reports were prepared in accordance with the relevant
               rules  and   regulations   of  each   taxing   authority   having
               jurisdiction  over the  Company  and are true  and  correct.  The
               Company has neither  given nor been  requested to give any waiver
               of any statute of limitations relating to the payment of federal,
               state,  local or foreign taxes.  The Company has not been, nor is
               it now being, audited by any federal, state, local or foreign tax
               authorities. The Company has made all required deposits for taxes
               applicable  to the current tax year.  The Company is not, and has
               never been, a member of any  Affiliated  group within the meaning
               of Section 1504 of the Internal  Revenue  Code, as in effect from
               time to time.
          (k)  Litigation.  Except as set forth on Schedule  8(k),  there are no
               actions,  suits,  proceedings,  orders,  investigations or claims
               pending  or,  to the best  knowledge  of the  Company  after  due
               inquiry,  threatened against or affecting the Company,  at law or
               in equity or before or by any federal,  state, municipal or other
               governmental  department,  commission,  board, bureau,  agency or
               instrumentality;  there are no  arbitration  proceedings  pending
               under collective bargaining agreements or otherwise;  and, to the
               best  knowledge  of the Company  after due  inquiry,  there is no
               basis for any of the foregoing.
          (l)  Compliance  with Law.  The Company has  complied in all  material
               respects  with all  applicable  statutes and  regulations  of the
               United States and of all states,  municipalities  and  applicable
               agencies  and foreign  jurisdictions  or bodies in respect of the
               conduct of its business and operations.
          (m)  Trademarks and Patents.  Each trademark,  trade name,  patent and
               copyright (and application  therefor) owned by the Company is not
               subject to any license,  royalty  arrangement,  option or dispute
               and is free and clear of all liens.  To the best knowledge of the
               Company after due inquiry,  none of the trademarks,  trade names,
               patents or copyrights  used by the Company in connection with its
               business infringes any trademark, trade name, patent or copyright
               of others in the United  States or in any other  country,  in any
               way which adversely  affects or which in the future may adversely
               affect the business or operations of the Company. No stockholder,
               officer or director  of the  Company or any other  person owns or
               has any  interest in any  trademark,  trade name,  service  mark,
               patent,  copyright  or  application  therefor,  or trade  secret,
               licenses, invention, information or proprietary right or process,

                                      -7-

<PAGE>
               if any, used by the Company in connection with its business.  The
               Company  has no notice or  knowledge  of any  objection  or claim
               being  asserted  by any person  with  respect  to the  ownership,
               validity  enforceability  or use of any  such  trademarks,  trade
               names,  patents and  copyrights  (and  applications  therefor) or
               challenging or questioning the validity or  effectiveness  of any
               license relating thereto. There are no unresolved conflicts with,
               or pending claims of, any other person,  whether in litigation or
               otherwise,  involving the  trademarks,  trade names,  patents and
               copyrights (and applications  therefor),  and there are no liens,
               encumbrances, adverse claims, or rights of any other person which
               would prevent the Company from fulfilling its  obligations  under
               this  Agreement.  To the best  knowledge of the Company after due
               inquiry,  the business of the Company, as presently conducted and
               as  proposed  to be  conducted  does not and will not  cause  the
               Company to violate any trademark,  trade name, patent, copyright,
               trade secret, license or proprietary interest of any other person
               or  entity,  in any way which  adversely  affects or which in the
               future may  adversely  affect the business or  operations  of the
               Company.
          (n)  Insurance.  Each insurance policy  maintained by the Company with
               respect to its  properties,  assets and business is in full force
               and effect; and the Company is not in default with respect to its
               obligations under any of such insurance policies.  Such insurance
               coverage is in amounts not less than is customarily maintained by
               corporations   engaged  in  the  same  or  similar  business  and
               similarly  situated,  including,  without  limitation,  insurance
               against loss,  damage,  fire,  theft,  public liability and other
               risks.  The  activities  and  operations of the Company have been
               conducted  in a  manner  so  as  to  conform  to  all  applicable
               provisions  of these  insurance  policies and the Company has not
               taken or failed to take any  action  which  would  cause any such
               insurance policy to lapse.
          (o)  Agreements.  Except as set forth on Schedule 8(o), the Company is
               not party to nor bound by any agreement or commitment, written or
               oral, which obligates the Company to make payments to any person,
               or which obligates any person to make payments to the Company, in
               the case of each such agreement in an amount  exceeding  $50,000,
               or which is  otherwise  material to the conduct and  operation of
               the  business or  proposed  business of the Company or any of its
               properties  or  assets,   including,   without  limitation,   all
               shareholder,    employment,    non-competition   and   consulting
               agreements  and  employee  benefit  plans  and  arrangements  and
               collective  bargaining agreements to which the Company is a party
               or by which it is bound. All such agreements are legal, valid and
               binding obligations of the Company, in full force and effect, and
               enforceable in accordance with their respective terms,  except as
               the  enforceability  thereof  may be limited  by (a)  bankruptcy,
               insolvency,  moratorium,  and similar  laws  affecting  creditors
               rights  generally  and (b) the  availability  of  remedies  under
               general  equitable  principles.  The  Company has  performed  all
               obligations  required  to be  performed  by  it,  and  is  not in
               default,  or in receipt of any claim, under any such agreement or
               commitment,  and  the  Company  has  no  present  expectation  or
               intention of not fully  performing all of such  obligations,  nor
               does the Company have any knowledge of any breach or  anticipated
               breach by the other parties to any such  agreement or commitment.
               The Company is not party to any contract,  agreement,  instrument
               or understanding which materially adversely affects the business,
               properties, prospects, operations, assets or condition (financial
               or otherwise) of the Company.

                                       -8-

<PAGE>

          (p)  Undisclosed  Liabilities.  Except as set forth on Schedule  8(p),
               the Company has no  obligation  or  liability  (whether  accrued,
               absolute, contingent,  unliquidated, or otherwise, whether due or
               to become due,  except that, as to contingent  liabilities,  such
               reference is only as to matters which are reasonably  possible of
               assertion  and,  which if asserted,  could  reasonably  result in
               material  liability)  of which the Company knows or has reason to
               know  exists  arising  out of  transactions  entered  into  at or
               included on the September 30, 1999 balance sheet  included in the
               Financial  Statements prior to the Closing Date, or any action or
               inaction at or prior to the Closing  Date,  or any state of facts
               existing at or prior to the Closing Date,  except (i) liabilities
               in an amount less than $50,000 incurred in the ordinary course of
               business  (none of which is a liability  for breach of  contract,
               breach of warranty, torts, infringements, claims or lawsuits); or
               (ii)  liabilities  or  obligations  disclosed in the schedules to
               this Agreement.
          (q)  Employees; Conflicting Agreements. (i) The Company has caused all
               present members of management and all  professional  employees of
               and  consultants  and  advisors  to the  Company,  including  all
               employees and consultants  and advisors  involved in research and
               development, and will cause all such persons in the future, to be
               subject  to  agreements  with  respect  to (a)  nondisclosure  of
               confidential information,  (b) assignment of patents, trademarks,
               copyrights  and  proprietary   rights  to  the  Company  and  (c)
               disclosure  to the Company of  inventions  in form and  substance
               satisfactory to the Purchasers. (ii) To the best knowledge of the
               Company after due inquiry, no stockholder,  director,  officer or
               key  employee  of the  Company  is a  party  to or  bound  by any
               agreement, contract or commitment, or subject to any restrictions
               in connection with any previous or current employment of any such
               person (other than agreements with respect to the Company), which
               adversely  affects,  or which in the future may adversely affect,
               the  business  or the  proposed  business  of the  Company or the
               rights of any of the Purchasers under this Agreement,  including,
               without  limitation,  in respect of Purchasers rights as a holder
               of the Common  Shares and the shares of Common Stock  issuable in
               connection therewith.
          (r)  Compliance  with  Securities  Laws. (i) Assuming the accuracy and
               truth of each of Purchasers  representations set forth in Section
               2, all securities of the Company  heretofore sold and issued were
               sold and issued,  and the Common  Shares were offered and will be
               sold and issued, in compliance with all applicable federal, state
               and foreign securities laws. Neither the Company,  nor any of its
               Affiliates,  nor, to its best  knowledge  after due inquiry,  any
               person or entity  acting on its or their behalf has,  directly or
               indirectly, made any offers or sales of any security or solicited
               any offers to buy any security,  under  circumstances  that would
               require  registration  of the Common Shares under the  Securities
               Act of  1933,  as  amended  (the  "Securities  Act")  or for  the
               offering of the same to be integrated  with any other offering of
               securities;  (ii) The  Company  has not  directly  or  indirectly
               purchased  or redeemed  any shares of Common  Stock during the 30
               days preceding the Closing Date.
          (s)  Environmental Matters.
               (i)  The Company, and all properties owned, operated or leased by
                    the  Company,  have  obtained  and  currently  maintain  all
                    environmental   permits  required  for  their  business  and
                    operations and are in compliance with all such environmental
                    permits.  There are no legal proceedings pending nor, to the
                    best knowledge of the Company after due inquiry,  threatened

                                      -9-

<PAGE>
                    to modify or revoke any such environmental permits.  Neither
                    the Company,  nor any property owned,  operated or leased by
                    the  Company,  has  received any notice from any source that
                    there is lacking any  environmental  permit required for the
                    current use or operation of the business of the Company,  or
                    any property owned, operated or leased by the Company.
               (ii) All real property owned,  operated or leased by the Company,
                    and, to the best knowledge of the Company after due inquiry,
                    all  property  adjacent  to such  properties,  are free from
                    contamination by any hazardous material;  and the Company is
                    not  subject to  environmental  costs and  liabilities  with
                    respect   to   hazardous   materials,   and  no   facts   or
                    circumstances  exist which could give rise to  environmental
                    costs and liabilities with respect to hazardous materials.
               (iii)There is not now, nor has there been in the past, on, in, or
                    under any real property  owned,  leased,  or operated by the
                    Company, or by any of their respective  predecessors (a) any
                    asbestos-containing  materials,  (b) any underground storage
                    tanks, (c) above-ground storage tanks, (d) impoundments, (e)
                    poly-chlorinated biphenyls or (f) radioactive substances
               (iv) The Company, and all properties owned, operated or leased by
                    the Company, comply with all environmental laws
               (v)  Neither  the  Company,  nor any  property  owned,  leased or
                    operated  by the  Company,  has  received or been issued any
                    written request for  information,  or has been notified that
                    it   is  a   potentially   responsible   party   under   the
                    environmental  laws with  respect to any on-site or off-site
                    for which environmental costs and liabilities are asserted.
          t.   No  Brokers.  Except  for the  Placement  Agreement,  no  finder,
               broker,  agent or other  intermediary  has acted on behalf of the
               Company  in  connection  with the  offering  of the  Shares,  the
               execution  of this  Agreement or the  consummation  of any of the
               transactions contemplated by this Agreement.
          u.   Transactions with Affiliates.  Except as previously  disclosed in
               the Company's SEC filings and in the Company's  Proxy  Statement,
               no  director,  officer,  employee,  consultant  or  agent  of the
               Company,  or  member  of the  family  of any such  person  or any
               corporation, partnership, trust or other entity in which any such
               person,  or any  member of the family of any such  person,  has a
               substantial  interest  in or is an  officer,  director,  trustee,
               partner  or  holder of more  than 5% of the  outstanding  capital
               stock thereof,  is a party to any  transaction  with the Company,
               including any contract,  agreement or other arrangement providing
               for the  employment  of,  furnishing  of services by or requiring
               payments to any such person or firm.
          v.   Financial Statements. The financial statements of the Company and
               the related notes contained in the documents that the Company was
               required to file under the  Securities  and Exchange Act of 1934,
               as  amended,  during  the 12  months  preceding  the date of this
               Agreement   ("Exchange  Act  Documents")   present   fairly,   in
               accordance with generally  accepted  accounting  principles,  the
               financial position of the Company as of the dates indicated,  and
               the  results of its  operations  and cash  flows for the  periods
               therein  specified.  Such  financial  statements  (including  the
               related  notes) have been prepared in accordance  with  generally
               accepted  accounting  principles  applied on a  consistent  basis
               throughout  the  periods  therein  specified,  except  as  may be
               disclosed in the SEC Documents.

                                      -10-

<PAGE>


          w.   Accountants.  The  auditing  firm which the Company  expects will
               express their opinion with respect to the financial statements to
               be incorporated by reference from the Company's  Annual Report on
               Form  10-K  for  the  year  ended  December  31,  1999  into  the
               Registration  Statement  (as  defined  below) and the  Prospectus
               which  forms  a  part  thereof,  are  and  shall  be  independent
               accountants  as required by the  Securities Act and the rules and
               regulations promulgated thereunder (the "Rules and Regulations").
          x.   Transfer  Taxes. On the Closing Date, all stock transfer or other
               taxes (other than income  taxes) which are required to be paid in
               connection with the sale and transfer of the Shares to be sold to
               the Purchaser hereunder will be, or will have been, fully paid or
               provided for by the Company and all laws imposing such taxes will
               be or will have been fully complied with.
          y.   Investment Company. The Company is not an "investment company" or
               an   "affiliated   person"  of,  or   "promoter"   or  "principal
               underwriter" for an investment company, within the meaning of the
               Investment Company Act of 1940, as amended.
          z.   Offering Materials.  Other than the SEC Documents and the Private
               Placement   Memorandum  dated  the  date  hereof  (the  "Offering
               Materials"),  the  Company  has  not  distributed  and  will  not
               distribute  prior to the Closing  Date any  offering  material in
               connection with the offering and sale of the Shares.  The Company
               has  not in the  past  nor  will it  hereafter  take  any  action
               independent  of the  Placement  Agent to sell,  offer for sale or
               solicit  offers to buy any  securities of the Company which would
               bring the offer,  issuance or sale of the Shares, as contemplated
               by this  Agreement,  within  the  provisions  of Section 5 of the
               Securities Act, unless such offer,  issuance or sale was or shall
               be within the exemptions of Section 4 of the Securities Act.


9.       Covenants of the Company.
         ------------------------
         The Company covenants and agrees with the Purchasers as follows:

          (a)  Restrictive Legend. (1) The Purchasers acknowledge and agree that
               until such time as the  shares  have been  registered  for resale
               under the 1933 Act as  contemplated  by  Section  10  below,  the
               certificates  for the Shares  will bear a  restrictive  legend as
               described in Section 4(d) of this  Agreement.  (2) Once the Shelf
               Registration  Statement  provided in Section 10 has been declared
               effective, thereafter (i) upon request of a Purchaser the Company
               will  promptly  (but in no event  later than three  Trading  Days
               after receipt of such  Purchaser's  legended  certificates by the
               Company) substitute  certificates  without restrictive legend for
               certificates  for any Shares issued prior to the dates such Shelf
               Registration  Statement  is declared  effective  by the SEC which
               bear  such  restrictive   legend  and  remove  any  stop-transfer
               restriction relating thereto and (ii) the Company shall not place
               any restrictive  legend on certificates  for any Shares issued or
               impose any stop-transfer restriction thereon.

                                      -11-

<PAGE>

          (b)  Form D. The Company  agrees to file a Form D with  respect to the
               Shares  as  required  under  Regulation  D and to  provide a copy
               thereof to Purchaser  promptly after such filing.  Each Purchaser
               agrees to  cooperate  with the  Company in  connection  with such
               filing  and,  upon  request  of  the  Company,   to  provide  all
               information  relating to such Purchaser  reasonably  required for
               such filing.
          (c)  Use of Proceeds.  The proceeds of sale of the Shares will be used
               for continuing  research and development for its existing product
               line  future  clinical  trials and for  general  working  capital
               purposes and in the operation of the Company's business.

10.      Registration of Shares.
         ----------------------
          (a)  Not later than 10  business  days  after the  Closing  Date,  the
               Company  will  file with the SEC a shelf  registration  statement
               (the "Shelf  Registration  Statement") with respect to the resale
               of the Common Shares  beneficially owned by Purchasers  following
               the Closing (the "Registrable Securities").  The Company will use
               its best  efforts  to,  within  120 days  after  the date of such
               filing,  effect the  registrations,  qualifications or compliance
               (including,  without  limitation,  the  execution of any required
               undertaking  to  file  post-effective   amendments,   appropriate
               qualifications   under   applicable   blue  sky  or  other  state
               securities  laws  and  appropriate   compliance  with  applicable
               securities   laws,   requirements   or  regulations)  as  may  be
               reasonably  requested and as would permit or facilitate  the sale
               and   distribution  of  all  Registrable   Securities  until  the
               distribution is complete;  provided that the Company shall not be
               obligated to maintain the effectiveness of the Shelf Registration
               Statement  (and  any  related   qualifications   and  compliance)
               following  such time as the Company  shall  deliver an opinion of
               counsel  reasonably  satisfactory  to the holders of  Registrable
               Securities (such holders are referred to as the "Holders') and in
               form and  substance  satisfactory  to each  Holder  that (i) such
               Holders  may  sell  in  a  single   transaction  all  Registrable
               Securities  then held or issuable to such Holder on a  registered
               securities   exchange  or  NASDAQ   market  under  an  applicable
               exemption from the  registration  requirements  of the Securities
               Act and  all  other  applicable  securities  laws  and  (ii)  all
               transfer  restrictions  and  restrictive  legends with respect to
               such Registrable Securities will be removed upon the consummation
               of such sale.
          (b)  Registration  Procedures.  In connection with the registration of
               any Registrable  Securities  under the Securities Act as provided
               in this  Section 10, the Company  will use its best  efforts,  as
               expeditiously as possible:
               (i)  To  prepare  and file  with the SEC the  Shelf  Registration
                    Statement  with respect to such  Registrable  Securities and
                    use its  best  efforts  to  cause  such  Shelf  Registration
                    Statement to become effective as expeditiously as possible;
               (ii) To  prepare  and  file  with  the SEC  such  amendments  and
                    supplements  to such Shelf  Registration  Statement  and the
                    prospectus used in connection  therewith as may be necessary
                    to keep such Shelf  Registration  Statement  effective until
                    the  disposition  of all  securities in accordance  with the
                    intended methods of disposition by the seller or sellers set
                    forth  in  such  Shelf   Registration   Statement  shall  be
                    completed,   and  to  comply  with  the  provisions  of  the
                    Securities  Act (to the extent  applicable  to the  Company)
                    with respect to such dispositions;

                                      -12-

<PAGE>

               (iii)To furnish  to each  seller of such  Registrable  Securities
                    such number of copies of such Shelf  Registration  Statement
                    and of each  such  amendment  and  supplement  (in each case
                    including  all  exhibits),  such  number  of  copies  of the
                    prospectus  included  in such Shelf  Registration  Statement
                    (including each preliminary prospectus),  in conformity with
                    the  requirements  of the  Securities  Act,  and such  other
                    documents,  as such seller may reasonably  request, in order
                    to facilitate the disposition of the Registrable  Securities
                    owned by such seller;
               (iv) To  use  its  best  efforts  to  register  or  qualify  such
                    Registrable  Securities  covered by such Shelf  Registration
                    Statement  under such other  securities  or blue sky laws of
                    such jurisdictions as any seller reasonably requests, and do
                    any and all other  acts and things  which may be  reasonably
                    necessary or  advisable to enable such seller to  consummate
                    the  disposition in such  jurisdictions  of the  Registrable
                    Securities  owned by such  seller,  except  that the Company
                    will  not  for any  such  purpose  be  required  to  qualify
                    generally  to do  business as a foreign  corporation  in any
                    jurisdiction  wherein it would not, but for the requirements
                    of this Section 10 be obligated to be qualified,  to subject
                    itself to taxation in any such  jurisdiction,  or to consent
                    to general service of process in any such jurisdiction;
               (v)  To  provide  a  transfer  agent and  registrar  for all such
                    Registrable  Securities  covered by such Shelf  Registration
                    Statement  not later than the  effective  date of such Shelf
                    Registration Statement;
               (vi) To notify each seller of such Registrable  Securities at any
                    time when a  prospectus  relating  thereto is required to be
                    delivered  under the Securities Act, of the happening of any
                    event as a result of which the  prospectus  included in such
                    Shelf Registration Statement contains an untrue statement of
                    a  material  fact or omits  any fact  necessary  to make the
                    statements  therein not  misleading,  and, at the request of
                    any such seller,  the Company  will prepare a supplement  or
                    amendment  to  such   prospectus   so  that,  as  thereafter
                    delivered to the purchasers of such Registrable  Securities,
                    such  prospectus  will not contain an untrue  statement of a
                    material  fact or omit to state any fact  necessary  to make
                    the statements therein not misleading.  The Purchasers agree
                    to suspend,  upon request of the Company, any disposition of
                    Registrable   Securities   pursuant   to  the   Registration
                    Statement  contemplated  hereby  during any  period,  not to
                    exceed one 30-day period per  circumstance  or  development.
                    (vii) To use its best efforts to cause all such  Registrable
                    Securities  to be  listed  on each  securities  exchange  or
                    automated  over-the-counter  trading system on which similar
                    securities issued by the Company are then listed;
               (viii) To enter into such customary agreements (including, in the
                    event   Purchasers   elect  to  engage  an   underwriter  in
                    connection  with  the  Shelf  Registration   Statement,   an
                    underwriting   agreement   containing  customary  terms  and

                                      -13-

<PAGE>
                    conditions)  and take all such other  actions as  reasonably
                    required in order to expedite or facilitate the  disposition
                    of such Registrable Securities; and
               (ix) To  make   available   for   inspection  by  any  seller  of
                    Registrable  Securities,  all financial  and other  records,
                    pertinent   corporation  documents  and  properties  of  the
                    Company,  and cause the  Company's  officers,  directors and
                    employees to supply all information  reasonably requested by
                    any such seller in  connection  with the Shelf  Registration
                    Statement.
               (x)  With  a view  to  making  available  to  the  Purchaser  the
                    benefits of Rule 144 (or its  successor  rule) and any other
                    rule or  regulation  of the SEC that may at any time  permit
                    the   Investor  to  sell   Shares  to  the  public   without
                    registration,  the Company covenants and agrees to: (i) make
                    and keep public  information  available,  as those terms are
                    understood  and defined in Rule 144;  (ii) file with the SEC
                    in a timely manner all reports and other documents  required
                    of the  Company  under  the  Securities  Act and  under  the
                    Exchange  Act;  and  (iii)  furnish  to the  Purchaser  upon
                    request,  as long as the  Purchaser  owns  at  least  25,000
                    Shares,  (A) a written  statement by the Company that it has
                    complied with the reporting  requirements  of the Securities
                    Act and the Exchange Act, (B) a copy of the  Company's  most
                    recent  Annual  Report on Form 10-K or  Quarterly  Report on
                    Form  10-Q,  and  (C)  such  other  information  as  may  be
                    reasonably  requested in order to avail the Purchaser of any
                    rule or  regulation  of the SEC that  permits the selling of
                    any such Shares without registration.
          (c)  Registration and Selling  Expenses.  All expenses incurred by the
               Company  in  connection  with  the  Company's  performance  of or
               compliance with this Section 10,  including,  without  limitation
               (i) all  registration  and filing fees  (including  all  expenses
               incident to filing with the National  Association  of  Securities
               Dealers,  Inc.),  (ii)  blue  sky fees and  expenses,  (iii)  all
               necessary  printing and duplicating  expenses,  and (iv) all fees
               and  disbursements  of counsel  and  accountants  retained by the
               Company  (including  the  expenses  of  any  audit  of  financial
               statements)   (all  such  expenses  being  called   "Registration
               Expenses"), will be paid by the Company.
          (d)  The  Company  will,  in  any  event,   in  connection   with  any
               registration  statement,  pay its internal  expenses  (including,
               without limitation, all salaries and expenses of its officers and
               employees  performing  legal,   accounting  or  other  duties  in
               connection therewith and expenses of audits of year-end financial
               statements),  the expense of liability insurance and the expenses
               and fees for listing the  securities  to be  registered on one or
               more securities exchanges or automated  over-the-counter  trading
               systems on which  similar  securities  issued by the  Company are
               then listed.
          (e)  Nothing in this  Agreement  shall be  construed  to  prevent  any
               Holder or Holders of Registrable  Securities  from retaining such
               counsel as they shall choose at their own expense.

11.      Indemnification.
         ---------------
          (a)  The Company shall indemnify, to the extent permitted by law, each
               Holder of  Registrable  Securities,  its  officers,  trustees and
               directors,  if any,  and each person,  if any, who controls  such
               Holder  within the  meaning of the  Securities  Act,  against all
               losses,  claims,  damages,  liabilities  and expenses  (under the
               Securities  Act or common law or otherwise)  caused by any untrue
               statement  or  alleged  untrue   statement  of  a  material  fact

                                      -14-

<PAGE>

               contained in any  registration  statement or  prospectus  (and as
               amended  or   supplemented  if  the  Company  has  furnished  any
               amendments or supplements) or any preliminary  prospectus,  which
               registration  statement,  prospectus  or  preliminary  prospectus
               shall  be   prepared   in   connection   with  the   contemplated
               registration,  or caused by any  omission or alleged  omission to
               state therein a material  fact  required to be stated  therein or
               necessary to make the statements  therein not misleading,  except
               insofar as such losses, claims, damages,  liabilities or expenses
               are caused by any untrue  statement or alleged  untrue  statement
               contained  in  or  by  any  omission  or  alleged  omission  from
               information furnished in writing by such holder to the Company in
               connection  with  the  contemplated   registration  provided  the
               Company  will not be liable  pursuant to this  Section 10 if such
               losses, claims, damages, liabilities or expenses have been caused
               by any selling security holder's failure to deliver a copy of the
               registration  statement  or  prospectus,  or  any  amendments  or
               supplements.
          (b)  In connection with any  registration  statement in which a Holder
               is  participating,  each such Holder shall furnish to the Company
               in writing such  information  as is  reasonably  requested by the
               Company for use in any such registration  statement or prospectus
               and shall severally,  but not jointly,  indemnify,  to the extent
               permitted  by law, the Company,  its  directors  and officers and
               each person,  if any, who controls the Company within the meaning
               of the  Securities  Act,  against  any losses,  claims,  damages,
               liabilities and expenses  resulting from any untrue  statement or
               alleged  untrue  statement of a material  fact or any omission or
               alleged  omission of a material fact required to be stated in the
               registration   statement  or   prospectus  or  any  amendment  or
               supplement  or  necessary  to make  the  statements  therein  not
               misleading,  but only to the extent such losses, claims, damages,
               liabilities  or  expenses  are caused by an untrue  statement  or
               alleged  untrue  statement  contained  in or by  an  omission  or
               alleged omission from information so furnished in writing by such
               Holder in connection with the contemplated  registration.  If the
               offering  pursuant  to any  such  registration  is  made  through
               underwriters,   each  such   Holder   agrees  to  enter  into  an
               underwriting  agreement in customary form with such  underwriters
               and to indemnify such underwriters, their officers and directors,
               if any, and each person who controls such underwriters within the
               meaning of the Securities Act to the same extent as provided with
               respect  to  indemnification  by  such  Holder  of  the  Company.
               Notwithstanding  the  foregoing  or any other  provision  of this
               Agreement,  in no event  shall a Holder be liable for any losses,
               claims,  damages,  liabilities  or  expenses in excess of the net
               proceeds received by such Holder in the offering.
          (c)  Promptly after receipt by an  indemnified  party of notice of the
               commencement of any action or proceeding,  such indemnified party
               will,  if a claim is made  against the  indemnifying  party under
               such  Section,  notify the  indemnifying  party in writing of the
               commencement;  but the  omission  so to notify  the  indemnifying
               party will not relieve it from any liability which it may have to
               any indemnified party otherwise than under such Section.  In case
               any such action or proceeding is brought  against any indemnified
               party,   and  it   notifies   the   indemnifying   party  of  the
               commencement,   the  indemnifying   party  will  be  entitled  to
               participate,  and, to the extent that it wishes, jointly with any
               other  indemnifying  party  similarly  notified,  to  assume  the
               defense,  with counsel  approved by such  indemnified  party, and
               after  notice  from the  indemnifying  party to such  indemnified
               party of its election so to assume the defense,  the indemnifying
               party  will not be liable to such  indemnified  party  under such
               Section for any legal or any other expenses subsequently incurred

                                      -15-

<PAGE>

               by such  indemnified  party in connection with the defense (other
               than reasonable  costs of  investigation)  unless incurred at the
               written request of the indemnifying  party.  Notwithstanding  the
               above,  the  indemnified  party  will  have the  right to  employ
               counsel of its own choice in any such action or proceeding if the
               indemnified  party has  reasonably  concluded  that  there may be
               defenses  available to it which are different  from or additional
               to those of the indemnifying party, or counsel to the indemnified
               party is of the opinion  that it would not be  desirable  for the
               same counsel to  represent  both the  indemnifying  party and the
               indemnified party because such  representation  might result in a
               conflict of interest  (in either of which cases the  indemnifying
               party will not have the right to assume  the  defense of any such
               action  or  proceeding  on  behalf  of the  indemnified  party or
               parties  and such legal and other  expenses  will be borne by the
               indemnifying  party). An indemnifying party will not be liable to
               any  indemnified  party for any  settlement of any such action or
               proceeding  effected  without  the  consent of such  indemnifying
               party.
          (d)  If  the  indemnification  provided  for  in  this  Section  11 is
               unavailable  under  applicable  law to an  indemnified  party  in
               respect of any losses, claims, damages or liabilities referred to
               therein,  then each  applicable  indemnifying  party,  in lieu of
               indemnifying  such  indemnified  party,  shall  contribute to the
               amount paid or payable by such  indemnified  party as a result of
               such losses, claims, damages or liabilities in such proportion as
               is  appropriate  to reflect the relative  fault of the Company on
               the one hand and of the Holders on the other in  connection  with
               the  statements  or  omissions  which  resulted  in such  losses,
               claims,  damages,  or liabilities,  as well as any other relevant
               equitable  considerations.  The relative  fault of the Company on
               the one hand and of the Holders on the other shall be  determined
               by  reference  to,  among  other  things,  whether  the untrue or
               alleged  untrue  statement of a material  fact or the omission to
               state a material  fact  relates to  information  supplied  by the
               Company  or by the  Holders  and the  parties'  relative  intent,
               knowledge,  access to information  and  opportunity to correct or
               prevent such statement or omission. The amount paid or payable by
               a  party  as  a  result  of  the  losses,   claims,  damages  and
               liabilities referred to above shall be deemed to include, subject
               to the  limitations  set forth in this  Section  11, any legal or
               other  fees or  expenses  reasonably  incurred  by such  party in
               connection with  investigating  or defending any action or claim.
               Notwithstanding  the  foregoing  or any other  provision  of this
               Agreement,  in no event shall a Holder be required to  contribute
               any amount in excess of the net proceeds  received by such Holder
               in the offering  less any amount paid by such Holder  pursuant to
               any other  provision  of this  Section  11.  No person  guilty of
               fraudulent misrepresentation (within the meaning of Section 11(f)
               of the Securities Act) will be entitled to contribution  from any
               person who is not guilty of such fraudulent misrepresentation.
          (e)  Promptly  after receipt by the Company or any Holder of notice of
               the commencement of any action or proceeding, such party will, if
               a claim for contribution is to be made against another party (the
               "contributing  party"),  notify  the  contributing  party  of the

                                      -16-

<PAGE>
               commencement;  but the  omission  so to notify  the  contributing
               party will not relieve it from any liability which it may have to
               any other party other than for contribution under this Agreement.
               In case any such action,  suit, or proceeding is brought  against
               any party,  and such party notifies a  contributing  party of the
               commencement,   the  contributing   party  will  be  entitled  to
               participate  with the notifying party and any other  contributing
               party similarly notified.

12.      Company Indemnities.
         -------------------
         The Company agrees to indemnify,  defend and hold  Purchasers and their
         officers, trustees,  directors,  partners,  employees,  consultants and
         agents (the  "Purchasers'  Indemnitees")  harmless from and against any
         damages  or  third-party   claims   incurred  or  suffered  by  any  of
         Purchasers'  Indemnitees  as a  result  of  or  arising  out  of  or in
         connection with the Company's breach of any  representation,  warranty,
         covenant or agreement of the Company  contained in this  Agreement  and
         such  indemnity  shall  survive  the  execution  and  delivery  of this
         Agreement.  The applicable Purchasers' Indemnities will promptly notify
         the Company of any potential  indemnification  claim upon  discovery of
         the facts  supporting the potential claim and, if such  indemnification
         is based on a third-party  claim,  allow the Company to defend,  manage
         and resolve the matter at the Company's cost and with the  indemnities'
         reasonable cooperation.

13.      Amendments and Waivers.
         ----------------------
         This  Agreement  and it's  exhibits and  schedules set forth the entire
         agreement and understanding  among the parties as to the subject matter
         and  merges  and  supersedes  all  prior  discussions,  agreements  and
         understandings  of any and every nature among them.  This Agreement may
         be amended  only by mutual  written  agreement  of the  Company and the
         Purchasers,  and the Company may omit to take any action required to be
         performed by it, and any breach of any covenant, agreement, warranty or
         representation  may be waived,  only if the  Company has  obtained  the
         written  consent or waiver of a majority in interest of the Purchasers.
         No course of dealing  between or among any persons  having any interest
         in  this  Agreement  will be  deemed  effective  to  modify,  amend  or
         discharge any part of this  Agreement or any rights or  obligations  of
         any person under or by reason of this Agreement.

14.      Successors and Assigns.
         ----------------------
         This  Agreement  shall be binding  upon and inure to the benefit of the
         Company and it's  permitted  successors  and assigns and Purchasers and
         their successors and assigns.  The provisions which are for Purchasers'
         benefit as  purchasers or holders of the Common Shares are also for the
         benefit of, and  enforceable  by, any subsequent  holder of such Common
         Shares.

15.      Notices.
         -------
         All notices,  demands and other communications to be given or delivered
         under or by  reason of the  provisions  of this  Agreement  shall be in
         writing  and  shall be deemed to have  been  given  personally  or when
         mailed by certified or registered  mail,  return receipt  requested and
         postage  prepaid,  and  addressed to the  addresses  of the  respective
         parties set forth below or to such  changed  addresses  as such parties

                                      -17-

<PAGE>

         may have fixed by notice; provided,  however, that any notice of change
         of address shall be effective only upon receipt:

                           If to the Company:
                           Immunomedics, Inc.
                           300 American Road
                           Morris Plains, New Jersey 07950
                           Attn: Dr. David M. Goldenberg

         With a Copy to:

         Starr, Gern,  Davison & Rubin, 103 Eisenhower  Parkway,  Roseland,  NJ
         07068

         If to the Purchasers:
         At the addresses shown on Exhibit A with a copy to Sutro & Co., Inc.

16.      Governing Law; Consent to Jurisdiction.
         --------------------------------------
         The validity,  performance,  construction  and effect of this Agreement
         shall be governed by those laws of the State of New Jersey. The parties
         irrevocably  consent to the  jurisdiction of the courts of the State of
         New Jersey and of any federal court located in such State in connection
         with any  action  or  proceeding  arising  out of or  relating  to this
         Agreement,  any  document  or  instrument  delivered  pursuant  to,  in
         connection with or simultaneously  with this Agreement,  or a breach of
         this Agreement or any such document or instrument.

17.      Counterparts.
         ------------
         This  Agreement  may be  executed  in any number of  counterparts  and,
         notwithstanding  that  any of the  parties  did not  execute  the  same
         counterpart,  each of such  counterparts  shall,  for all purposes,  be
         deemed an original,  and all such counterparts shall constitute one and
         the same instrument binding on all of the parties.

18.      Headings.
         --------
         The headings of the  Sections  are inserted as a matter of  convenience
         and for  reference  only and in no way define,  limit or  describe  the
         scope of this Agreement or the meaning of any provision.

19.      Severability.
         ------------
         In the event that any provision of this Agreement or the application of
         any  provision  is  declared  to  be  illegal,   invalid  or  otherwise
         unenforceable  by a court of competent  jurisdiction,  the remainder of
         this Agreement shall not be affected except to the extent  necessary to
         delete such  illegal,  invalid or  unenforceable  provision  unless the
         provision  held invalid shall  substantially  impair the benefit of the
         remaining portion of this Agreement.

20.      Governing Law.
         -------------
         This Agreement  shall be governed by and interpreted in accordance with
         the laws of the State of New Jersey.

                                      -18-

<PAGE>

21.      Exculpation Among Purchasers.
         ----------------------------
         Each Purchaser  acknowledges and agrees that it is not relying upon any
         other  Purchaser,  or  any  officer,  director,   employee  partner  or
         affiliate  of any such other  Purchaser,  in making its  investment  or
         decision to invest in the  Company or in  monitoring  such  investment.
         Each  Purchaser  agrees that no Purchaser nor any  controlling  person,
         officer,  director,  stockholder,  partner,  agent or  employee  of any
         Purchaser shall be liable for any action  heretofore or hereafter taken
         or omitted to be taken by any of them relating to or in connection with
         the Company or the Shares, or both.

22.      Actions by Purchasers.
         ---------------------
         Any actions  permitted to be taken by holders or  Purchasers  of Shares
         and any  consents  required  to be  obtained  from the same  under this
         Agreement,  may be taken or given only by, in the case of  consents  or
         actions requiring approval of a Purchaser, by the applicable Purchaser,
         and in all other  cases,  except to the  extent  inconsistent  with any
         explicit provision of this Agreement,  only by holders of a majority in
         interest of the Common Stock.

23.      Publicity.
         ---------
         The Company will not issue any public  statement,  press release or any
         other public  disclosure  listing Purchaser as one of the purchasers of
         the Shares without Purchaser's prior written consent.

                            [Signature Page Follows]

                                      -19-

<PAGE>



                          IN WITNESS  WHEREOF,  this Agreement was duly executed
on the 14th day of February, 2000.

                                              IMMUNOMEDICS, INC.

                                               By: /s/ David M. Goldenberg
                                                   -----------------------------
                                                   David M. Goldenberg, M.D.,
                                                   Chairman

                                      -20-

<PAGE>

                                   Purchasers

  The following is a list of the purchasers whose signatures are on the file.

DCF Capital L.P.                                       75,000
DCF Life Sciences Fund LTD                             25,000
Dresdner RCM Global Investor                          200,000
Franklin Templeton Group                              300,000
Global Lifesciences Fund                              749,375
Aspen Global Life Sciences Fund                           625
JMG Capital                                            75,000
Moore Global Investments, Ltd.                        160,000
Remington Investment Strategies, L.P.                  40,000
Palantir Capital                                      100,000
Beacon Funds                                           75,000
1st New York Securities                                75,000
Westcliff Master Fund L.P.                             40,530
Westcliff Partners L.P.                                33,470
Westcliff Partners SA L.P.                              8,300
Westcliff Long/Short L.P.                               9,940
Westcliff Small Cap Fund L.P.                           7,760
Samuel Lupin, M.D.                                     17,000
F/B/O Arnold M. Lupin IRA                              25,000
Lupin Foundation                                       15,000
Sontag Partners                                        10,000
Robert D. Marcus, M.D.                                 10,000
E. Ralph Lupin, M.D.                                    3,000
Fagey Lupin Fischman                                   10,000
Taylor - Schabelman Group                               5,000
Taylor - Schabelman Group                               5,000
Morton Coleman, M.D.                                  104,000
Robert M. Gelfand, M.D.                                20,000
Mark Pasmentier, M.D.                                   6,000
Mark Goldblatt                                         20,000
Aires Domestic Fund, L.P.                              30,482
Aires Domestic Fund II, L.P.                            5,139
The Aires Master Fund                                  64,379







                                   EXHIBIT 5.1

February 24, 2000

Immunomedics, Inc.
300 American Road

Morris Plains, New Jersey 07950

Gentlemen and Ladies:

         You have requested our opinion,  as counsel for  Immunomedics,  Inc., a
Delaware  corporation  (the  "Company"),   in  connection  with  a  Registration
Statement on Form S-3 (the "Registration Statement") under the Securities Act of
1933  (the  "Act"),  filed by the  Company  with  the  Securities  and  Exchange
Commission (the "Commission").

         The  Registration  Statement  relates  to the  offering  by a group  of
selling  stockholders  of up to 2,325,000  shares of the Company's  Common Stock
(the "Shares")  purchased  from the Company  pursuant to a Common Stock Purchase
Agreement

         In the  preparation  of our opinion,  we have examined (1) the Restated
Certificate of Incorporation of the Company, as amended to date, (2) the By-Laws
of the  Company,  in effect on the date  hereof,  (3) minutes of meetings of the
Company's Board of Directors,  as made available to us by executive  officers of
the Company, (4) a certificate from an executive officer of the Company, (5) the
Registration  Statement  and (6) the Common Stock Private  Placement  Agreement,
dated as of February 14, 2000 (the  "Agreement").  In our examinations,  we have
assumed the  genuineness of all  signatures,  the  authenticity of all documents
submitted to us as originals,  the  conformity to the originals of all documents
submitted  to  us  as  certified,  photostatic  or  conformed  copies,  and  the
authenticity of the originals of all such latter documents.

         Based  upon such  examination,  we are of the  opinion  that the Shares
issued to the purchasers under the Agreement were validly issued, fully paid and
non-assessable .

         We hereby  consent  to the  filing of our  opinion as an exhibit to the
Registration Statement and to the reference to our firm under the caption "Legal
Matters" in the prospectus included in the Registration Statement.

                                                           Sincerely yours,


                                                           Lowenstein Sandler PC


<PAGE>




                                  EXHIBIT 23.1

                       CONSENT OF INDEPENDENT ACCOUNTANTS

The Board of Directors
Immunomedics, Inc.

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.

                                                             KPMG LLP

Short Hills, New Jersey
February 24, 2000



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