IMMUNOMEDICS INC
S-3/A, 1999-03-04
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
Previous: THT INC, 15-12G/A, 1999-03-04
Next: STRONG OPPORTUNITY FUND INC, N-30D, 1999-03-04






   
                                                      Registration No. 333-69975
As filed with the Securities and Exchange Commission on March 4, 1999
    


                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549
                                   ----------

   
                               AMENDMENT NO. 2 TO
    
                                    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)
                                  ------------

                               Robert J. DeLuccia
                      President 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:
                            Michael D. Schwamm, Esq.
                             Warshaw Burstein Cohen
                             Schlesinger & Kuh, LLP
                                555 Fifth Avenue
                            New York, New York 10017
                                 (212) 984-7700

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. [ ]


<PAGE>



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

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


<PAGE>



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                            Subject to Completion, dated March 4, 1999
    


                               IMMUNOMEDICS, INC.

                        10,000,000 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 shares of common stock that they
may acquire  upon  conversion  of shares of our Series F  Convertible  Preferred
Stock  that we  issued to them on  December  9, 1998  pursuant  to a  Securities
Purchase  Agreement.  Additional  information  concerning our agreement with the
selling  stockholders  is set forth  under the  caption  "Immunomedics  - Recent
Financing Arrangement."

TRADING SYMBOL

Nasdaq National Market -  "IMMU"

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
that they may receive upon conversion of the Series F 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 3.

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.






                                                         ___________, 1999

                                        1

<PAGE>



                                TABLE OF CONTENTS

RISK FACTORS...................................................................3
         History of Operating Losses...........................................3
         Limited Number of Approved Products; Lack of Significant
          Product Revenues.....................................................3
         Uncertainty of Product Development....................................3
         Need for Additional Capital...........................................4
         Limited Marketing and Sales Experience and Capability.................4
         Dependence on Third Parties for Distribution of Products..............4
         Limited Manufacturing Capability......................................5
         Dependence on Fluids Produced in Mice ................................5
         Dependence on The Center for Molecular Medicine and Immunology........5
         Potential Conflicts of Interest with The Center
          for Molecular Medicine and Immunology ...............................5
         Extensive Government Regulation.......................................6
         Uncertainty of Health Care Reimbursement..............................6
         Dependence on Key Personnel...........................................7
         Possible Inability to Successfully Compete............................7
         Impact of Rapid Technological Change..................................7
         Limited Protection of Intellectual Property Rights....................7
         Specific Patent Issues Involving CEA-Scan.............................8
         Product Liability.....................................................8
         Control by Existing Principal Stockholder.............................8
         Potential Redemption of Series F Stock or Penalty Payments............8
         Substantial Dilution; Potential for Issuance of
   
                  Significant Number of Shares of Common Stock.................8
         Potential Adverse Impact on Market Price of Common Stock..............9
         Stock Price Volatility................................................9
         Effect of Certain Anti-Takeover Provisions............................9
         Potential Loss of Nasdaq National Market Listing ....................10
         Year 2000 Compliance.................................................11
         No Expectation that We Will Pay Dividends............................11
    

SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS.............................11

WHERE YOU CAN FIND MORE INFORMATION...........................................12

   
IMMUNOMEDICS..................................................................13
         Description of Our Business..........................................13
         Recent Financing Arrangement.........................................15
    

USE OF PROCEEDS...............................................................18

   
SELLING STOCKHOLDERS..........................................................19

PLAN OF DISTRIBUTION..........................................................21
         Manner of Sales; Broker-Dealer Compensation..........................21
         Filing of Supplement to Prospectus In Certain Instances..............22
         Certain Persons Deemed to be Underwriters............................22
         Regulation M.........................................................22

LEGAL MATTERS.................................................................23

EXPERTS  .....................................................................23
    


                                        2

<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.

History of Operating Losses

   
         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, 1998,
we had an  accumulated  deficit  of  approximately  $93,000,000.  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.
    

Limited Number of Approved Products; Lack of Significant Product Revenues

         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 will achieve market
acceptance or generate significant sales. Unless we receive substantial revenues
from these  products,  future  revenues  will be dependent in large part upon us
receiving   payments  from  corporate  partners  under  licensing  and  research
agreements or from government grants. However, we cannot assure you that we will
receive such payments in a timely manner, or at all.

         While we expect to  receive  approval  from the FDA to market  and sell
LeukoScan in the United States,  we cannot assure you that such approval will be
received  in a timely  manner,  if at all.  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 approval to market
and sell  LeukoScan in the United States is not received on a timely basis or if
the FDA  imposes  significant  conditions  or  restrictions,  our  business  and
operations could be significantly and adversely affected.

Uncertainty of Product Development

         We have a number of  diagnostic  and  therapeutic  products  in various
stages of  development  as well as  potential  new uses for  marketed  products.
Before any of our other  products  can be marketed and sold,  we must  undertake
substantial  research and  development.  All new products  face a high degree of
uncertainty, including the following:

o        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.

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

o        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.

o        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.

o        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.


                                        3

<PAGE>



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

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

o        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.

o        The product may not gain satisfactory market acceptance.

o        The product may be superceded by another product commercialized for the
         same indication.

         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.

Need for Additional Capital

         For the  foreseeable  future,  we will  require  significant  financial
resources  for us to  continue  our  budgeted  levels of  expenses  and  capital
expenditures, including for:

o        Ongoing pre-clinical and clinical trials of our existing products.

o        Research and development of new products.

o        Marketing and sales of CEA-Scan and LeukoScan.

o        Marketing  and  sales for  our  other  products if we receive necessary
         regulatory approvals.

o        Capital expenditures, including Year 2000 compliance upgrades

         Unless our existing products generate  significant revenues or we enter
into corporate  partnering  arrangements,  we will require additional  financial
resources by the end of calendar 1999 in order to continue our planned levels of
research  and  development  and  clinical  trials of our  proposed  products and
regulatory  filings  for  new  indications  of  existing  products.   Without  a
significant  increase in product revenues or other infusion of capital,  we will
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 such  financing  will not cause
substantial dilution to our existing stockholders.

Limited Marketing and Sales Experience and Capability

         We  have  only  recently   established  our  own  sales  and  marketing
organization to market CEA-Scan and LeukoScan.  We cannot assure you that we can
successfully  maintain and continue to build such 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.

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

Dependence on Third Parties for Distribution of Products

         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 such 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.

                                        4

<PAGE>



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.

Limited Manufacturing Capability

         While  we  have  the  capacity  to  manufacture   all  of  our  current
requirements for CEA-Scan and LeukoScan,  if demand for these 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.

         We rely on a single third party to perform certain  end-stage  portions
of the manufacturing process for CEA-Scan and LeukoScan. While we have qualified
a second entity in the event a second  end-stage  manufacturer  is required,  we
cannot assure that we will be able to negotiate an agreement with such entity on
terms we consider acceptable, if at all.

Dependence on Fluids Produced in Mice

         CEA-Scan  and  certain of our other  imaging  agents are  derived  from
ascites fluid  produced in mice,  which are provided by a third-party  supplier.
Regulatory  authorities,  particularly in Europe,  have expressed concerns about
the use of mice fluid for the  production  of  monoclonal  antibodies.  While we
believe that our current  quality  control  procedures  ensure the purity of the
fluid we use, we cannot assure you that regulatory  authorities  will agree that
these 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  have  also
contracted  with a third party for the  development  and  production  of certain
humanized  antibodies,  however  we  cannot  assure  that such  efforts  will be
successful.

Dependence on The Center for Molecular Medicine and Immunology

         Our product  development has involved,  to varying degrees,  The Center
for Molecular Medicine and Immunology,  a not-for-profit cancer research center.
CMMI 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, the results of which are made available to us
pursuant to a collaborative research and license agreement. We cannot assure you
that CMMI will be successful in its research  activities or that it will develop
any potential products which can be licensed by us.

         In  addition,  if CMMI were no  longer to  conduct  such  research  and
patient  evaluations,  we would have to make arrangements with third parties for
the performance of this aspect of our clinical  research,  which may prolong and
increase  expenses  associated with  pre-clinical  testing and initial  clinical
trials.

Potential Conflicts of Interest with The Center
for Molecular Medicine and Immunology

         Dr.  David M.  Goldenberg,  our  Chairman of the Board and former 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.  While  we have put in place  certain  procedural  safeguards  and
mechanisms  relating to the  allocation  of research  projects and  licensing of
proprietary rights between CMMI and us, due to Dr. Goldenberg's and other of our
key employees  relationships  with both entities,  the potential for conflict of
interest exists.


                                        5

<PAGE>



Extensive Government Regulation

         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 similar authorities in foreign countries. 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 such 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,   the  FDA  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.

         In  addition to laws and  regulations  enforced by the FDA, we are also
subject to regulation  under the various other federal,  state or local laws and
regulations.  Our  research  and  development  involves  the  controlled  use of
hazardous  materials,  chemicals,  viruses  and various  radioactive  compounds.
Although we believe our safety  procedures  for handling  and  disposing of such
materials comply with the standards prescribed by state and federal regulations,
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 such liability could exceed our resources.

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

         For  marketing  outside  the United  States,  we are subject to foreign
regulatory  requirements  governing human clinical trials and marketing approval
for drugs and  devices.  The  requirements  governing  the  conduct of  clinical
trials,  product licensing,  pricing and reimbursement vary greatly from country
to country.  Failure to comply with such regulatory  requirements or obtain such
approvals  could  impair our ability to develop  these  markets and could have a
significant and adverse affect on our business and operations.

Uncertainty of Health Care Reimbursement

         Our ability to successfully  commercialize  our products will depend in
part on the  extent to which  reimbursement  for the cost of such  products  and
related  treatment  will be  available  from  government  health  administration
authorities,  private health insurers and other organizations.  Such 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 such a 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 will not implement
a system of price controls.  Any such system might  significantly  and adversely
affect our ability to market our products profitably.


                                        6

<PAGE>



Dependence on Key Personnel

         The  continued  development  of our business and  operations  is highly
dependent upon the talents of Dr. Goldenberg and certain key executive  officers
and 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,  we have an ongoing  need to expand our  management  personnel  and
support staff.  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 attract and retain
additional qualified  personnel,  our operations also could be significantly and
adversely affected.

Possible Inability 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.

Impact of Rapid Technological Change

         We are  pursuing an area of product  development  in which there is the
potential for extensive technological  innovation 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 non-competitive or obsolete.

Limited Protection of Intellectual Property Rights

         Our  commercial  success is highly  dependent  upon  patents  and other
proprietary  rights  that we own or  license.  While  we  actively  seek  patent
protection both in the United States and abroad for our proprietary  technology,
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.

         While we believe  that the  protection  of patents is  important to our
business,  we also rely on trade  secrets,  unpatented  know-how and  continuing
technological  advancement to establish and maintain our  competitive  position.
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.  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. If we
determine  that the  inventions  covered by such patents are necessary or useful
for us, we may attempt to license  such rights.  We cannot  assure you that such
rights will be available at all or even upon terms we consider acceptable. If we
are unable to obtain  such  rights,  our  business  could be  significantly  and
adversely affected.


                                        7

<PAGE>



Specific Patent Issues Involving CEA-Scan

         We  have  sued  F.   Hoffmann-LaRoche  and  its  Roche  subsidiary  and
affiliates  in the  Netherlands  for what we believe to be  infringement  of our
European patent covering  specific  anti-CEA  antibodies.  They have denied that
they are  infringing our patents and  counter-sued  seeking to nullify our Dutch
and German patents.  A trial was held on our infringement claim before the Dutch
Patent  Court,  resulting  in dismissal of the action based in part on the trial
judge's inability to resolve validity issues without a full trial of the nullity
action.  While we have appealed the  dismissal,  we cannot assure you we will be
successful. In addition, while the trial on the Dutch nullity action resulted in
dismissal of that action and  maintenance  of all our patent  claims,  Roche has
appealed  and we cannot  assure you that the appeal  court will also rule in our
favor.  The trial in the German  nullity  action has been concluded in our favor
but we do not know if Roche will appeal or, if they do, that the appellate court
also will rule in our favor.

         We believe that affirmation of the validity of this patent is important
because its claims  also  protect the  antibody  we use in our  CEA-Scan  cancer
imaging product and our CEA-Cide cancer therapy  product,  as well as the use of
highly specific anti-CEA antibodies for a number of other uses. While we believe
that our  European  patents are valid and that  Hoffmann-LaRoche  has  infringed
them, and that an unfavorable outcome in the infringement and nullity actions is
unlikely,   if  we  receive  an  unfavorable  outcome,  our  business  could  be
significantly and adversely affected.

Product Liability

         The  clinical  testing,  marketing  and  manufacturing  of our products
necessarily  involves the risk of product  liability.  While we  currently  have
product  liability  insurance,  we cannot  assure that we will be able to obtain
such  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.

Control by Existing Principal Stockholder

   
         As of February  26, 1999,  Dr.  Goldenberg,  our founder and  Chairman,
controlled  the right to vote over  approximately  35% of our common stock.  Dr.
Goldenberg's voting power includes shares which he is entitled to vote by powers
of attorney or proxy  granted to him by his children  and his former wife.  As a
result of such  holdings,  Dr.  Goldenberg may have the ability to determine the
election of all of our  directors,  direct  policies  and control the outcome of
substantially all matters which may be put to a vote of our stockholders.
    

Potential Redemption of Series F Stock or Penalty Payments

         As  discussed  below in the section  "Immunomedics  - Recent  Financing
Arrangement" upon the occurrence of certain circumstances, we may be required to
redeem the Series F Stock or pay significant penalties. These penalties could be
as much as 15% per year of the stated  value of the Series F Stock.  We also may
be  required  to reduce the  conversion  price of the Series F Stock.  If we are
required to redeem the Series F Stock or make the penalty  payments,  we may not
have the financial ability to make such payments.  Even if we have the financial
ability to redeem the Series F Stock or pay the required penalties, such payment
could significantly and adversely affect our financial condition and deplete our
cash resources

Substantial Dilution; Potential for  Issuance of Significant Number of Shares of
Common Stock

         The Series F Stock that we issued to the selling stockholders generally
will become fully  convertible into shares of our common stock beginning on June
8, 1999. Because the conversion price of the Series F Stock is not fixed, we may
be required to issue to them a significant number of shares of our common stock.
However,  we are only registering  10,000,000  shares for resale by them at this
time. The conversion  price  generally will be the lower of the average  closing
bid price of our common stock during

                                        8

<PAGE>



   
the 20 trading days ending June 6, 1999 and the average closing bid price of our
common stock over the lowest 15 days during the 45-day period  immediately prior
to the  applicable  conversion  date. As our stock price  decreases,  we will be
required to issue an  increased  number of shares and the greater the decline in
the market price, the greater the number of shares we would be required to issue
upon conversion of our Series F Stock.  Had the Series F Stock been  immediately
convertible as of February 26, 1999, the conversion  price would have been $2.91
per  share and we would  have been  required  to issue  approximately  4,329,000
shares of our common stock had the holders converted all of their Series F Stock
on such date.
    

         Given that the  conversion  price is based on the average of the lowest
closing price during a specified  period,  the market price for our common stock
may be significantly greater than the conversion price for the Series F Stock in
effect  at  the  time  of  conversion.  In  such a  case,  the  conversion  of a
significant  number of Series F Stock into common stock during that period would
dilute the percentage ownership interest of our existing common stockholders.

         In addition, the resale by the selling stockholders of the common stock
could depress the market price of our common stock.  Moreover, as all the common
stock to be sold to the selling  stockholders  generally  will be available  for
immediate  resale by them on and after June 8, 1999,  the mere  prospect of such
sales could further depress the market price for our common stock.

          For more  information  about the Series F Stock,  see  "Immunomedics -
Recent Financing Arrangement."

Potential Adverse Impact on Market Price of Common Stock

   
         As of February 26, 1999, we had a total of 37,888,090  shares of common
stock  issued  and  outstanding,   of  which  29,580,102  shares  were  held  by
non-affiliates and are freely tradeable in the public market without restriction
under the Securities Act of 1933.  The remaining  8,307,988  shares were held by
our directors and executive officers and are considered "restricted  securities"
subject to the resale  limitations  of Rule 144 under the  Securities  Act.  The
prospect of the ability to publicly resell these restricted shares may adversely
affect prevailing market prices for the common stock.
    

Stock Price Volatility

         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:

o        actual or anticipated fluctuations in our operating results;

o        the status of our products in development;

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

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

o        prolonged periods  of regulatory review of new products or new uses for
         existing products

o        determinations regarding our patent applications and those of others;

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

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

Effect of Certain 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


                                        9

<PAGE>



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.

         Further,  pursuant to the terms of our stockholder rights plan, we have
distributed  as a dividend for each  outstanding  shares of our common stock,  a
preferred stock purchase right.  This right will cause  substantial  dilution to
the  ownership  of a person or group  that  attempts  to acquire us on terms not
approved  in  advance  by our  Board of  Directors  and may have the  effect  of
deterring hostile takeover attempts.  However,  our Board of Directors has taken
appropriate  action to ensure that the rights are not  triggered by the issuance
of the  Series F Stock or upon  issuance  of our common  stock  upon  conversion
thereof.

   
Potential Loss of Nasdaq National Market Listing

     Potential Loss of Nasdaq Listing due to Failure to Meet Listing Criteria.

         Our common stock is quoted on the Nasdaq  National  Market and pursuant
to the terms of the Series F Stock,  we are  required  to list the common  stock
issuable upon  conversion of the Series F Preferred Stock on the Nasdaq National
Market.  However,  in order to continue  to be  included in the Nasdaq  National
Market,  a company  must meet  certain  maintenance  criteria.  The  maintenance
criteria most  applicable to us requires a minimum bid price of $1.00 per share,
$4,000,000  in net tangible  assets  (total  assets less total  liabilities  and
goodwill)  and  $5,000,000  market  value of the public float . The public float
excludes  shares held  directly or  indirectly by any officer or director of our
company.  As of December  31,  1998,  we had  approximately  $18,112,000  of net
tangible assets and approximately  $79,174,000  market value of our public float
and the lowest bid price of our common  stock since  January 1, 1997 was $2.625.
However,  we cannot  assure  you that we will  continue  to meet  these  listing
criteria. Failure to meet these maintenance criteria may result in the delisting
of our common stock from the Nasdaq National Market. In order to have our common
stock relisted on the Nasdaq National  Market,  we would be required to meet the
criteria for initial  listing,  which are more  stringent  that the  maintenance
criteria. Accordingly, we cannot assure you that if we were delisted we would be
able to have our common stock  relisted on the Nasdaq  National  Market.  If our
common stock were delisted  from the Nasdaq  National  Market,  we would seek to
have our common stock  quoted on the Nasdaq  SmallCap  Market,  if we would then
meet the requirements for inclusion on the Nasdaq SmallCap Market. As securities
traded on the Nasdaq SmallCap  Market tend to have less  liquidity,  an investor
may find it more  difficult to dispose of our common stock.  A company must have
$4,000,000  in net  tangible  assets or  $50,000,000  market  capitalization  or
$750,000 net income in two of the last three years, a minimum bid price of $4.00
per share and a public float of $5,000,000 for inclusion in the Nasdaq  SmallCap
Market, subject to certain exceptions.

     Potential Loss of Nasdaq Listing as a Result of Issuance of Series F Stock.

         The  Nasdaq  Stock  Market  has recently issued an interpretive release
regarding the issuance of convertible  securities  with  below-market,  floating
rate  conversion  features,  such as is the case  with our  Series F Stock.  The
Nasdaq release includes the following items:

o        a requirement that  stockholder  approval be obtained prior to issuance
         of a floating  rate  below-market  convertible  security if the maximum
         number of shares of common stock which could be
    

                                       10

<PAGE>
   
         issued without  stockholder  approval could equal or exceed 20% or more
         of the outstanding common stock.

o        a requirement that the voting rights of the common stockholders are not
         disparately reduced or restricted by granting the holders of the Series
         F Stock the special voting  rights,  such as voting on an "As converted
         basis"  or  board  representation  that is  disproportionate  to  their
         relative contribution to the Company's market or book value.

o        a requirement that the bid price be at least $1.

o        a  requirement  that an issuer  re-apply  for  initial  inclusion  if a
         sufficient  number of shares are issued such that it may be viewed as a
         change of control or change in financial structure.

         If The Nasdaq  Stock  Market  determines  that we have failed to comply
with these  rules,  our common  stock  could be delisted  from the Nasdaq  Stock
Market.

         In addition,  the  Nasdaq Stock Market could delist our common stock if
it determines  that  the  issuance  of the Series F Stock raises public interest
concerns. In making such a determination, it will consider, among other factors:

o        the business purpose of the transaction.

o        the amount raised relative to our existing capital structure.

o        the dilutive efect of the transation on our existing stockholders.

o        the  risk  undertaken  by  the  holders  of the holders of the Series F
         Stock.

o        the  relationship  between Immunomedics and the holders of the Series F
         Stock.

o        whether this transaction was preceded by other similar transactions.

o        whether  this  transaction  is  consistant   with  just  and  equitable
         principle of trade.

Trading  if any,  in our common  stock  would  thereafter  be  conducted  in the
over-the-counter  market. As a result of such delisting, an investor may find it
more difficult to dispose of, or to obtain  accurate  quotations for, our common
stock.

         Finally, as discussed elsewhere in this prospectus,  a delisting of our
common  stock  would give the holders of the Series F Stock  certain  redemption
rights. Additionally,  if our common stock is removed from listing on the Nasdaq
National Market,  it may become more difficult for us to raise funds through the
sale of our common stock or securities convertible into our common stock.
    

Year 2000 Compliance

         Computer systems may experience problems handling dates beyond the year
1999 because many computer  programs use only two digits to identify a year in a
date  field.  We are in the  process  of  conducting  a review  of our  business
systems,  including our computer systems and  manufacturing  equipment.  We also
have sent written  inquiries to our  customers,  distributors  and vendors as to
their  progress in identifying  and  addressing  problems that their systems may
face in correctly  interpreting and processing date information as the year 2000
approaches and is reached.  We expect that our review will be completed by March
1999.  Based on this review,  we intend to implement a plan to achieve year 2000
compliance.  However,  we cannot  assure  that our review will be  completed  as
scheduled or that our compliance  program will be implemented on a timely basis.
While we believe  that we will achieve  year 2000  compliance  in a manner which
will be non-disruptive to our operations,  unforeseen  complications could arise
that could disrupt our operations.  In addition, while we have commenced work on
various types of contingency  planning to address  potential  problem areas with
internal systems,  suppliers and other third parties,  we cannot assure you that
we will be able to implement our contingency plan in a timely manner, if at all.

         While  we do  not  believe  that  Year  2000  compliance  will  have  a
significant  affect on our business or operations,  we could encounter  problems
with third party suppliers and revenue sources which could adversely  affect us.
We cannot accurately predict the occurrence and or outcome of any such problems,
nor can we currently  estimate the dollar  amount of such problem , which may or
may not be  significant.  In addition,  we cannot assure you that the failure to
ensure year 2000  compliance by a third party would not have a  significant  and
adverse affect on our business and operations.

No Expectation 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. In addition, we

                                       11

<PAGE>



are  required to obtain the  approval of the holders of the Series F Stock prior
to the payment of any dividends on our common stock.


                SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS

         We have made  statements  in this  prospectus,  and in the documents we
incorporate by reference,  that are considered by the SEC to be "forward-looking
statements"  within the meaning of the Securities Act of 1933 and the Securities
Exchange Act of 1934.  Sometimes these  statements  contain words such as "may,"
"believe," "expect," "continue," "intend,"  "anticipate" or other similar words.
These statements are not guarantees of our future performance and are subject to
risks,  uncertainties and other factors that could cause our actual  performance
or achievements to be materially  different from those which we project. 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.

         The  following  factors,  among  others,  discussed  above  under "Risk
Factors" or in the documents  which we  incorporate  by  reference,  could cause
materially different results from those anticipated or projected:

         o        inherent uncertainties accompanying the  marketing of CEA-Scan
                  and LeukoScan

         o        inherent  uncertainties  involving new product development and
                  marketing

         o        inability  to obtain capital for continued product development
                  and commercialization

         o        actions of regulatory authorities concerning product approval

         o        actions of government and private organizations concerning
                  reimbursement of medical expenses

         o        impact of competitive products and pricing

         o        results of clinical trials

         o        loss of key employees

         o        changes in general economic and business conditions

         o        changes in industry trends


                       WHERE YOU CAN FIND MORE INFORMATION

         We file annual,  quarterly and special  reports,  proxy  statements and
other information with the SEC. You may read and copy any document which we file
at the SEC's  Public  Reference  Rooms in  Washington,  D.C.,  New York City and
Chicago.  Please call the SEC at 1-800-SEC-0330  for further  information on the
public   reference   rooms.   The  SEC   maintains   a   internet   website   at
http://www.sec.gov where certain of our publicly filed information may be found.

         This  prospectus is part of a registration  statement we filed with the
SEC. The registration  statement  contains more information than this prospectus
regarding  us  and  our  common  stock,   including  supplemental  exhibits  and
schedules.  You can get 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

                                       12

<PAGE>



reference is considered  to be part of this  prospectus,  and later  information
that  we  file  with  the  SEC  will  automatically  update  and  supercede  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 of 1934:

         o        Annual  Report on Form 10-K for the fiscal year ended June 30,
                  1998;

   
         o        Quarterly  Reports  on  Form 10-Q for the fiscal quarter ended
                  September 30, 1998 and December 31, 1998;
    

         o        Current Report on Form 8-K, filed on December 15, 1998;

         o        Proxy Statement, dated October 2, 1998, with respect to our
                  1998 annual meeting of stockholders; and

         o        Description  of the 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  (excluding all exhibits unless
we have  specifically  incorporated  an exhibit by  reference),  at no cost,  by
writing or telephoning us at:

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


         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. We are not making an offer of
our shares in any state where the offer is not permitted.

                                  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 imaging of infection in  osteomyelitis  as well as for the
imaging  of  infection  in  acute,  atypical  appendicitis.  The  review  of the
LeukoScan  submission  to the FDA  continues to progress.  As part of the review
process,  we are in discussions with the FDA to address their comments regarding
the adequacy of our data to support  final  approval for these  indications . We
are confident that we can bring these discussions with the FDA to

                                       13

<PAGE>



successful and timely closure.  In the meantime,  we are continuing to implement
our plans for market introduction,  and are working diligently on preparation to
bring this new product to the U.S. market place.


         Marketing, Sales and Distribution

         CEA-Scan is marketed  and sold in the U.S.  directly by our sales force
of  approximately  20 sales  representatives  and 3 regional  managers,  who are
deployed in major metropolitan  areas. 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.

         Our European  operations,  headquartered in Hillegom,  The Netherlands,
include European management, sales and marketing,  medical/regulatory,  customer
service and invoicing,  collection and other administrative  functions.  We also
have established sales representation in most major European markets,  including
Germany,  France, Italy and The United Kingdom. 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.  Such  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.

         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,  whether  they  are  primary  tumors  of  which  have  spread
(metastases) to other organs. CEA also is associated with many other cancers. We
are  conducting  phase IV  clinical  trials to evaluate  the  product  following
repeated  administration.  We also are performing clinical trials using CEA-Scan
for imaging  lung cancer and breast  cancer.  We are  discussing  the results of
these  clinical  trials  with  the  FDA  and  comparable   European   regulatory
authorities  to  determine  whether  such data will  support the  submission  of
applications  for  marketing  approval.  On January 26,  1999,  we  submitted an
application  with the  European  Union  regulatory  authorities  for approval of
CEA-Scan for breast cancer imaging.  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, which 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 three other imaging products  pursuant to
Investigational  New Drug  applications  that we have filed or plan to file with
the FDA and we have ongoing clinical trials in Europe:

o        LymphoScan(R), for non-Hodgkin's B-cell lymphomas.

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

o        MyeloScan(TM),  for  imaging of bone marrow for detection of metastatic
         marrow disease.

         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

                                       14

<PAGE>



radioimmunotherapy.  This technique may deliver radiolabeled  therapeutic agents
to tumor sites more selectively  than current  radiation  therapy  technologies,
while minimizing debilitating side effects.

         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.
During 1998, we executed a letter of intent to form a joint venture with Beckman
Coulter to develop the next generation of cancer  therapeutics 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.

         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, followed by
a radionuclide 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  proprietary  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.

Recent Financing Arrangement

         On December 9, 1998,  we completed a private  placement of 1,250 shares
of Series F Convertible Preferred Stock to the selling stockholders and received
gross proceeds of $12,500,000.

         Each share of Series F Stock has an initial  stated  value of  $10,000,
which  increases at the rate of 4% per annum.  The Series F Stock is convertible
at the option of the selling  stockholders,  in whole or in part,  beginning  on
June 8, 1999, subject to acceleration in certain instances. The number of shares
of common stock issuable upon conversion of each share of Series F Stock will be
determined  by dividing  the stated value of $10,000 plus an accretion of 4% per
annum, by the conversion price then in effect.

         The conversion price is equal to:

o        the Variable  Price,  if such  Variable  Price is less than the Trigger
         Price;  except that prior to December 9, 1999,  subject to acceleration
         in certain instances,  if the Variable Price is greater than 90% of the
         Initial  Fixed Price and less than the Trigger  Price,  the  conversion
         price will equal the Trigger Price;

o        the  Trigger  Price,  if prior to June 9, 1999 or  earlier  in  certain
         circumstances,  the  Variable  Price is greater than 90% of the Initial
         Fixed Price and less than the Trigger Price; or

o        the  Trigger  Price,  if the Variable Price is equal to or greater than
         the Trigger Price and less than 150% of the Trigger Price; or

o        the Trigger  Price plus  one-half  of the amount,  if any, by which the
         Variable Price exceeds 150% of the Trigger Price, if the Variable Price
         is greater that 150% of the Trigger Price.


                                       15

<PAGE>



         The "Trigger  Price" will be equal to 125% of the Initial  Fixed Price.
The "Initial Fixed Price" will be equal to the average  closing bid price of our
common  stock  during the 20 trading  days  ending June 6, 1999.  The  "Variable
Price" will be equal to the average of the 15 lowest  closing bid prices for our
common stock during the 45 trading days immediately preceding a conversion date.

         During  the  first  several  months  after  the  Series  F Stock  would
otherwise  be  convertible  and to the extent  that the Series F Stock  would be
convertible at a conversion  price less than 90% of the Initial Fixed Price, the
selling stockholders have agreed to certain restrictions on the amount of Series
F Stock that can be converted.

         At any time during the 90-day period commencing on December 1, 1999, we
may, require the selling stockholders to purchase up to an additional $7,500,000
million  (750  shares)  our of Series F Stock.  Our right to require the selling
stockholders to purchase this additional amount is subject to certain conditions
and  limitations,  including  that the Variable Price has been at least equal to
the  Initial  Fixed  Price  for  a  specified  period  of  time.  Under  certain
circumstances and at certain prices, we may elect to redeem any shares of Series
F Stock. Under certain circumstances, we may require the selling stockholders to
convert their Series F Stock. We have granted the selling  stockholders  certain
participation   rights  if  we  issue  any  future  floating  rate   convertible
securities.

   
         The  holders of the Series F Stock  generally  do not have the right to
vote for the  election of directors  or on other  matters,  except to the extent
their rights would be adversely affected.

         Upon the occurrence of certain events, we may be required to redeem the
Series F Stock, pay certain penalties and/or adjust the conversion price.  These
events include the following:
    

o        If we consolidate,  merge or otherwise  combine with another entity and
         as a result the stockholders of our company  immediately  prior to such
         transaction do not retain  sufficient  voting power to elect a majority
         of the  board of  directors  of the new or  combined  entity,  then the
         holders of the Series F Stock may require us to redeem  their shares at
         a price per share equal to the greater of

         (1)      125%  of  the  stated  value  of  $10,000  per  share plus the
                  accretion of 4% per annum, and

         (2)      the  value  of  our  common  stock that would be issuable upon
                  conversion of the Series F Stock.

                  However,  if  the  consolidation,  merger  or  other  business
         combination  occurs as a result of a proxy  solicitation  which was not
         approved or recommended by our Board of Directors, then, if the holders
         exercise their redemption rights, we may, in lieu of redemption, either

         (y)      readjust  the  Initial  Fixed Price to 80% of the lower of (A)
                  the lowest  Variable Price during the period  beginning on the
                  date such  solicitation  is  announced  and ending on the date
                  such  solicitation is consummated,  abandoned or terminated or
                  (B) the Initial Fixed Price then in effect, or

         (z)      pay a penalty of 1% per day of the stated value of $10,000 per
                  share plus the  accretion  of 4% per annum for a maximum of 10
                  days in any 365-day period.

o        If at least a specified  percentage  of the holders of our common stock
         accept a purchase,  tender or exchange  offer,  then the holders of the
         Series F Stock may  require  us to redeem  their  shares at a price per
         share equal to the greater of

         (1)      125%  of  the  stated  value  of  $10,000  per  share plus the
                  accretion of 4% per annum, and

         (2)      the  value  of  our  common  stock that would be issuable upon
                  conversion of the Series F Stock.


                                       16

<PAGE>



                  However,  if such  purchase,  tender or exchange offer was not
         approved or recommended by our Board of Directors; then, if the holders
         exercise their redemption rights, we may, in lieu of redemption, either

         (y)      readjust  the  Initial  Fixed Price to 80% of the lower of (A)
                  the lowest  Variable Price during the period  beginning on the
                  date such offer is announced and ending on the date such offer
                  is  consummated,  abandoned or  terminated  or (B) the Initial
                  Fixed Price then in effect, or

         (z)      pay a penalty of 1% per day of the stated value of $10,000 per
                  share plus the  accretion  of 4% per annum for a maximum of 10
                  days in any 365-day period.

o        If we complete a sale of all or substantially  all of our assets,  then
         the holders of the Series F Stock may require us to redeem their shares
         at a price per share equal to the greater of

         (1)      125%  of  the  stated  value  of  $10,000  per  share plus the
                  accretion of 4% per annum, and

         (2)      the  value  of  our  common  stock that would be issuable upon
                  conversion of the Series F Stock.


o        If the registration statement (of which this prospectus is a part) does
         not become  effective by May 8, 1999,  then the holders of the Series F
         Stock may require us to redeem  their shares at a price per share equal
         to the greater of

         (1)      125%  of  the  stated  value  of  $10,000  per  share plus the
                  accretion of 4% per annum, and

         (2)      the  value  of  our  common  stock that would be issuable upon
                  conversion of the Series F Stock.

                  However,  if  the  failure  to  obtain  effectiveness  of  the
         registration statement is not the result of our failure to use our best
         efforts, then, if the holders exercise their redemption rights, we may,
         in lieu of redemption,

         (y)      pay a penalty of 1% per day of the stated value of $10,000 per
                  share plus the  accretion  of 4% per annum for a maximum of 15
                  days in any 365-day period, and

         (z)      adjust the Initial  Fixed Price to 80% of the lowest  Variable
                  Price during the period  commencing  May 8, 1999 and ending on
                  the day such registration statement is declared effective.

o        If after the registration statement becomes effective,  it ceases to be
         available  to the selling  stockholders  for the resale of their shares
         for more than 10  consecutive  days,  then the  holder of the  Series F
         Stock may require us to redeem  their shares at a price per share equal
         to the greater of

         (1)      125%  of  the stated value of $10,000 per share plus the
                  accretion of 4% per annum, and

         (2)      the  value  of  our  common  stock that would be issuable upon
                  conversion of the Series F Stock.

                  However,  if the unavailability of the registration  statement
         is not the result of our failure to use our best efforts,  then, if the
         holders  exercise  their  redemption   rights,   we  may,  in  lieu  of
         redemption,

         (y)      pay a penalty of 1% per day of the stated value of $10,000 per
                  share plus the  accretion  of 4% per annum for a maximum of 15
                  days in any 365-day period, and


                                       17

<PAGE>



         (z)      readjust the Initial Fixed Price to 80% of the lowest Variable
                  Price during the period commencing on the day the registration
                  statement  became  unavailable  and  ending  on  the  day  the
                  registration statement is again available for use.

o        If our common stock is delisted or suspended  from the Nasdaq  National
         Market for a period of more than five consecutive days, then the holder
         of the Series F Stock may require us to redeem  their shares at a price
         per share equal to the greater of

         (1)      125%  of  the  stated  value  of  $10,000  per  share plus the
                  accretion of 4% per annum, and

         (2)      the  value  of  our  common  stock that would be issuable upon
                  conversion of the Series F Stock.

                  However,  if our  common  stock is  delisted  from the  Nasdaq
         National Market (other than as a result of a voluntary  delisting by us
         as a result of the Nasdaq Stock  Market  limitations  discussed  below)
         then, if the holders exercise their redemption  rights, we may, in lieu
         of redemption,

         (y)      readjust  the  Initial  Fixed  Price to  68.5%  of the  lowest
                  Variable  Price  during the period  commencing  on the date of
                  delisting and continuing for 45 days thereafter, or

         (z)      pay a penalty of 1% per day of the stated value of $10,000 per
                  share plus the  accretion  of 4% per annum for a maximum of 15
                  days in any 365-day period.

         We also have  agreed to hold a Special  Meeting of  Stockholders  on or
before  March 24,  1999,  to seek  approval  of the  issuance of any shares upon
conversion  of the  Series F Stock in excess  of 20% of the  number of shares of
common stock we had outstanding December 9, 1998 (i.e.,  7,577,617 in accordance
with the rules and The Nasdaq  Market,  Inc.  Approval of the proposal will only
require a  majority  of the shares  voting in person or by proxy at the  Special
Meeting  of  Stockholders.  Dr.  Goldenberg,  certain  members of his family and
certain of our executive officers holding in the aggregate  approximately 30% of
our currently outstanding common stock have agreed to vote their shares in favor
of such  proposal.  Such  persons  also have  agreed  not to  dispose  of shares
constituting approximately 27% of the currently outstanding shares of our common
stock prior to such stockholders meeting. We have agreed, among other things, to
pay a penalty of $6.67 per each share of Series F Stock for each day after March
23, 1999 until the Special Meeting is held.

         Each selling  stockholder  has agreed that if it engages in short sales
transactions or other hedging  activities during the 45 trading days immediately
preceding a conversion date which involve,  among other things,  sales of shares
of our common  stock,  the  selling  stockholder  will place its sale orders for
common  stock in the course of such  activities  so as not to complete or effect
any such sale on any  trading  day during  such period at a price which is lower
than the lowest  sale  effected on such day by persons  other than such  selling
stockholder and its affiliates.  Each selling stockholder also has agreed not to
enter into any short sales or other  hedging  activities  which  involve,  among
other things,  sales of shares of our common  stock,  during the 25 trading days
ending June 8, 1999.

         Because the market price of our common stock is subject to fluctuation,
we have agreed,  pursuant to the terms of the registration rights agreement,  to
register  for resale at least 200% of the number of shares of common  stock that
would be  issuable  if all the Series F Stock were  converted  as of the date of
this prospectus and,  thereafter,  to maintain the registration of at least 150%
of the number of shares of common stock that would be issuable if all the Series
F Stock were then  converted.  Accordingly,  this prospectus  covers  10,000,000
shares,  which was our good faith estimate of this  obligation as of the date we
originally filed the registration  statement. If we fail to register or maintain
the  registration of a sufficient  number of shares,  we will be required to pay
the  selling  stockholders  the  following  penalties.  These  penalties  are in
addition to the redemption rights and/or penalties discussed above.

o        $150 per share of Series F Stock if the  registration  statement is not
         declared effective by April 8, 1999.


                                       18

<PAGE>



o        $5 per share of  Series F  Stock for each day after April 8,  1999 that
         the registration statement is not declared effective.

o        $5 per share of Series F Stock for each day that  sales  cannot be made
         pursuant to the registration statement.

         In connection  with our agreements  with the selling  stockholders,  we
have  agreed to  reimburse  them for their  legal  expenses  in an amount not to
exceed $50,000.

         For more  information  concerning this transaction and the terms of the
Series F Stock,  we direct you to our Current  Report on Form 8-K which we filed
with the SEC on December  15,  1998,  which  provides  more details and contains
copies of the documents discussed above.


                                 USE OF PROCEEDS

         We will not receive any  proceeds  from the sale of our common stock by
the selling stockholders.  However, we did receive net proceeds of approximately
$12,330,000 from the issuance of the Series F Stock to the selling stockholders.

         We will  use  the net  proceeds  we  received  from  the  sales  of our
preferred  securities for general  corporate  purposes,  including  research and
development,  clinical trials, regulatory filings, manufacturing,  marketing and
sales,  general and administrative and other expenses,  acquisitions of products
and  technologies,   license,  milestone,  royalty  and  similar  payments,  and
strategic and other acquisitions.


                              SELLING STOCKHOLDERS

         The table below presents the following  information:  (1) the number of
shares of Series F Stock  owned by each  selling  stockholder  as of the date of
this prospectus,  (2) the number of shares of common stock beneficially owned by
each selling  stockholder as of the date of this  prospectus,  (3) the number of
shares that such selling stockholder is offering under this prospectus,  and (4)
the number of shares that such selling  stockholder will  beneficially own after
the completion of this offering.

         Except as otherwise  noted in the table,  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 such 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 conversion
of the Series F Stock or the exercise of any stock option 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.

   
         The number of shares of our common stock shown as beneficially owned by
each selling  stockholder prior to the offering and the number of shares offered
by each selling stockholder represents shares of our common stock issuable to it
assuming  conversion,  as of February 26, 1999,  of all shares of Series F Stock
owned by such selling  stockholder  with respect to the $10,000  stated value of
the Series F Stock plus an  accretion  of 4% per year.  The number of shares was
calculated  using an assumed  conversion  price of $2.91,  which  represents the
average of the 15 lowest  closing bid prices for our common  stock during the 45
consecutive  trading  days ending on February  26,  1999.  As  described  in the
section  "Immunomedics - Recent Financing  Arrangement" above, the actual number
of shares of our common stock issuable upon  conversion of the Series F Stock is
based  upon the  market  price of  common  stock at the time of  conversion.  In
accordance with the provisions of the Series F Stock,  the conversion price will
fluctuate  from time to time based on changes in the market  price of our common
stock.  Therefore,  the actual  number of shares of common  stock may be less or
greater  than the number of shares  shown as  beneficially  owned by the selling
stockholders or the number of shares offered by this prospectus.
    

                                       19

<PAGE>



         Pursuant to the  regulations of The National  Association of Securities
Dealers,  Inc., in the absence of stockholder approval,  the aggregate number of
shares of our common  stock  issuable  to the holders of the Series F Stock at a
discount  from market price upon  conversion of the Series F Stock may not equal
or exceed 20% of the outstanding  shares of our common stock on December 9, 1998
(i.e.,  7,577,617  shares).  If  stockholder  approval is not  obtained to issue
shares of our  common  stock to the  holders  of the Series F Stock in excess of
such amount,  none of the holders will be entitled to acquire by conversion more
than its proportionate share of such maximum amount.

   
         The number of shares that will  ultimately be issued upon conversion of
the  Series F Stock is  dependent,  subject  to  certain  limitations,  upon the
average of certain closing bid prices of our common stock prior to conversion as
discussed  above,  such  number of shares  (and  therefore  the number of shares
offered hereby) cannot be determined at this time. As a result,  we have agreed,
pursuant  to the terms of the  registration  rights  agreement  with the selling
stockholders  to  register  for  resale at least 200% of the number of shares of
common stock that would be issuable if all the Series F Stock were  converted as
of the  date of  this  prospectus.  Had the  Series  F  Stock  been  immediately
convertible as of February 26, 1999, the conversion  price would have been $2.91
per  share and we would  have been  required  to issue  approximately  4,329,000
shares of our common stock had the holders converted all of their Series F Stock
on such date. As discuss above, we have agreed to registering  10,000,000 shares
of our common stock.  Accordingly,  the selling  stockholders may be entitled to
sell approximately  5,671,000 additional shares pursuant to this prospectus,  if
such shares are issued to them in accordance wit the terms of the Series F Stock
as assuming we receive the required stockholder approval (as discussed above).
    

         The number of shares shown as being  beneficially owned by each selling
stockholder  after the offering  assumes that such selling  stockholder has sold
all  the  shares  of our  common  stock  which  may be  sold  pursuant  to  this
prospectus.

         None of the selling  stockholders has had a material  relationship with
us within the past three  years,  other  than as a result of their  purchase  of
shares of our Series F Stock. As of the date hereof, no selling stockholder owns
any shares of our common  stock  other than the  shares  they may  acquire  upon
conversion of the Series F Stock.



<TABLE>
<CAPTION>
   
                                                                   Shares of                          Shares of
                                                    Shares of     Common Stock                       Common Stock
                                                    Preferred     Beneficially       Shares of       Beneficially
                                                      Stock      Owned Prior to    Common Stock      Owned After
Selling Stockholder                                   Owned       the Offering     Being Offered       Offering
- --------------------                                  -----       ------------     -------------       --------
<S>                                                   <C>         <C>              <C>                 <C>
AG Super Fund International Partners, L.P.(1)              20              69,263           69,263            0
Fisher Capital Ltd.(2)                                    195             675,317          675,317            0
GAM Arbitrage investments, Inc.(1)                         20              69,263           69,263            0
HFTP Investment L.L.C.(3)                                 650           2,251,055        2,251,055            0
Leonardo, L.P.(1)                                         200             692,632          692,632            0
Ramius Fund, Ltd.(1)                                       40             138,526          138,526            0
Raphael, L.P.(1)                                           20              69,263           69,263            0
Wingate Capital Ltd.(2)                                   105             363,632          363,362            0
    
- ----------------
</TABLE>



(1)      Angelo,  Gordon & Co., L.P. is a general partner of Leonardo,  L.P., AG
         Super Fund  International  Partners,  L.P.  and Raphael,  L.P.,  and is
         investment advisor to GAM Arbitrage Investments,  Inc. and Ramius Fund,
         Ltd. and consequently has voting control and investment discretion over
         securities  held by such  entities.  The  ownership  for  each of these
         entities  does not  include  the  ownership  information  for the other
         entities.  Angelo,  Gordon  & Co.,  L.P.  and  each  of the  referenced
         entities disclaims  beneficial  ownership of any of our securities held
         by the  other  referenced  entities.  Mr.  John M.  Angelo,  the  Chief
         Executive  Officer of Angelo,  Gordon & Co.,  L.P.,  and Mr. Michael R.
         Gordon, the Chief Operating Officer of Angelo,  Gordon & Co., L.P., are
         the sole  general  partners  of AG  Partners,  L.P.,  which is the sole
         general partner of Angelo, Gordon & Co., L.P. In such capacity, Messrs.
         Angelo and Gordon may be deemed to be the  beneficial  owner of any our
         securities  deemed to be  beneficially  owned by Angelo,  Gordon & Co.,
         L.P. However,  Messrs.  Angelo and Gordon disclaim beneficial ownership
         of such securities.

(2)      Citadel  Limited  Partnership is the trading manager of Wingate Capital
         Ltd. and Fisher  Capital Ltd. and  consequently  has voting control and
         investment  discretion over  securities held by such entities.  Citadel
         Limited Partnership is indirectly controlled by Mr. Kenneth C. Griffin.
         The ownership for each referenced entity does not include the ownership
         information   for  the  other   referenced   entity.   Citadel  Limited
         Partnership and each of the referenced  entities  disclaims  beneficial
         ownership  of any of our  securities  held by the other  entities.  Mr.
         Griffin  may be deemed  to be the  beneficial  ownership  of any of our
         securities  beneficially  owned by Citadel  Limited  Partnership or the
         referenced   entities.   However,   Mr.  Griffin  disclaims  beneficial
         ownership of such securities.

(3)      Promethean  Investment Group L.L.C. is the investment  advisor for HFTP
         Investment  L.L.C.  and  consequently has voting control and investment
         discretion over securities held by such entity.  Promethean  Investment
         Group L.L.C.  is indirectly  controlled  by Mr. James F.  O'Brien,  Jr.
         Promethean  Investment Group L.L.C.  disclaims  beneficial ownership of
         any of our securities held by HFTP Investment L.L.C. Mr. O'Brien may be
         deemed  to be  the  beneficial  ownership  of  any  of  our  securities
         beneficially  owned  by  Promethean  Investment  Group  L.L.C.  or HFTP
         Investments L.L.C.  However, Mr. O'Brien disclaims beneficial ownership
         of such securities.


                              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 common  stock that they  acquire when they
convert  shares of Series F Stock.  The sale of our common stock may be effected
in one or more of the following methods:

o        ordinary brokers' transactions;

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

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

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

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

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

o        in privately negotiated transactions;


                                       20

<PAGE>




o        to cover short sales; or

o        any combination of the foregoing.

         The selling stockholders also may sell the shares in reliance upon Rule
144 under the  Securities  Act at such times as they are  eligible  to do so. 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. Such 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 upon conversion of the Series F Stock,  and the pledgees,
secured parties or persons to whom such securities have been pledged shall, upon
foreclosure  in the event of  default,  be  considered  a  selling  stockholders
hereunder.  In addition,  such to the  limitations  discussed  above,  a selling
stockholder  may,  from time to time,  sell  short  our  common  stock.  In such
instances,  this prospectus may be delivered in connection with such short sales
and the shares of our common stock issued upon  conversion of Series F Stock may
be used to cover such 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  upon
conversion  of Series F Stock to lenders or others and each of such 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 such 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 the limitations discussed above, 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  such  selling  stockholder,  including  in  connection  with
distributions of our common stock by such 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 such common stock. A selling  stockholder may also
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 Supplement to Prospectus 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 supplement to this prospectus under Rule 424(c) under the Securities
Act. Such a supplement will disclose:

o        The name of each such broker-dealer.

o        The number of shares of common stock involved.

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

o        The commissions paid or discounts or concessions allowed to such broker
         -dealer(s).

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

                                       21

<PAGE>




o        Any other facts material to the transaction.

Certain Persons 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 such
persons or entities or the manner of sale of such 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 of  shares  of  common  stock.  In  general,  Rule  102  under
Regulation M prohibits any person  connected with a  distribution  of our common
stock (a "Distribution")  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 (we refer
to that time period as the "Distribution Period").

         During the  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.
No such person may effect any stabilizing transaction to facilitate any offering
at the market.  Inasmuch  as the selling  stockholders  will be  reoffering  and
reselling  our common  stock at the market,  Regulation  M  prohibits  them from
effecting any  stabilizing  transaction  in  contravention  of Regulation M with
respect to our common stock.

Indemnification and Other Matters

         We  will  pay  substantially  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  certain  of 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 such  indemnification  is  against  public  policy as  expressed  in the
Securities Act and is, therefore, unenforceable.

         Because  it is  possible  that a  significant  number  of shares of our
common  stock  could be sold at the same  time  hereunder,  such  sales,  or the
possibility  thereof,  may have a  significant  depressive  effect on the market
price of our common stock.

         This  offering  will  terminate on the earlier of (a) the date on which
the shares are eligible for resale without  restriction  pursuant to Rule 144(k)
under the Securities Act or (b) the date on which all shares offered hereby have
been sold by the selling stockholders.

                                  LEGAL MATTERS

         Warshaw Burstein Cohen  Schlesinger & Kuh, LLP will give its opinion on
the validity of the common  stock.  As of the date of this  prospectus,  certain
partners of such firm  beneficially  own an  aggregate of 1,200 shares of common
stock.


                                       22

<PAGE>



                                     EXPERTS

         Our consolidated  financial statements as of June 30, 1998 and 1997 and
for each of the years in the  three-year  period  ended June 30,  1998 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.


                                       23

<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 the  Company in  connection  with the  registration  of the
Shares:

SEC registration fee..................................................$    8,601
Nasdaq National Market listing fee....................................    17,500
Legal fees and expenses...............................................   115,000
Accounting fees and expenses..........................................    25,000
Miscellaneous expenses................................................     3,899
                                                                      ----------

         Total  ......................................................  $170,000

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 judgment,  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.

Item 16.   Exhibits.

Exhibit No.   Description

4.1   -       Securities Purchase Agreement, dated as of December 9 1998, by and
              among the Company and the investors named therein (incorporated by
              reference to Exhibit 10.1 to the Current Report on Form 8-K, filed
              by the Company on December 15, 1998).

4.2   -       Registration Rights Agreement,  dated  as of December 9, 1998,  by
              and   among  the   Company   and   the  investors  named   therein
              (incorporated by reference to Exhibit  10.2  to the Current Report
              on Form 8-K, filed by the Company on December 15, 1998).

4.3   -       Certificate  of  Designations,  Preferences and Rights of Series F
              Convertible Preferred Stock  (incorporated by reference to Exhibit
              3.1 to  the Current Report on Form  8-K,  filed by  the Company on
              December 15, 1998).
   
5     -       Opinion of Warshaw Burstein Cohen Schlesinger & Kuh, LLP.
              (previously filed)
    

23.1     -    Consent of KPMG LLP.

23.2     -    Consent of Warshaw Burstein Cohen Schlesinger & Kuh, LLP (included
              in their opinion previously filed as Exhibit 5).

                                      II-1

<PAGE>



24       -    Power of Attorney.  (previously filed)


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  (a)(1)(i) and  (a)(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.

                                      II-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 Amendment No. 1
to the  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
March 4, 1999.
    

                                                              IMMUNOMEDICS, INC.


                                           By: /s/ Robert J. DeLuccia
                                           Robert J. DeLuccia
                                           President and Chief Executive Officer
                                           (Principal Executive Officer)


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


Dated:
   
March 4, 1999                                            *
    
                                           -------------------------------------
                                           David M. Goldenberg,  Chairman of the
                                           Board and a Director


   
March 4, 1999                              /s/ Robert J. DeLuccia
                                           -------------------------------------
    
                                           Robert J. DeLuccia, President, Chief
                                           Executive Officer and Director
                                           (Principal Executive Officer)


   
March 4, 1999                                            *
                                           -------------------------------------
                                           W. Robert Friedman, Jr., Director


March 4, 1999                                            *
                                           -------------------------------------
                                           Marvin E. Jaffe, Director


March 4, 1999                                            *
                                           -------------------------------------
                                           Richard R. Pivirotto, Director


March 4, 1999                                            *
                                           -------------------------------------
                                           Richard C. Williams, Director


March 4, 1999                                            *
                                           -------------------------------------
                                           Kevin F.X. Brophy, Vice President,
                                           Finance and Administration and Chief
                                           Financial Officer (Principal
                                           Financial and Accounting Officer)
    

                                           *By: /s/ Robert J. DeLuccia
                                           Robert J. DeLuccia, as
                                           attorney-in-fact


                                      II-3

<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
March 4, 1999
    


                                       E-1

<PAGE>


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