IMMUNOMEDICS INC
SC 13G, 1999-12-30
IN VITRO & IN VIVO DIAGNOSTIC SUBSTANCES
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  Schedule 13G

                    Under the Securities Exchange Act of 1934

                               Immunomedics, Inc.

                     Common Stock, par value $.01 per share
                         (Title of Class of Securities)

                            (CUSIP Number: 452907108)

                                December 14, 1999
                                -----------------
                       Date of event which requires filing

Check the appropriate box to designate the rule pursuant to which the schedule
is filed:

                                |_| Rule 13d-1(b)
                                |x| Rule 13d-1(c)
                                |_| Rule 13d-1(d)

*The remainder of this cover page shall be filled out for a reporting person's
initial filing on this form with respect to the subject class of securities, and
for any subsequent amendment containing information which would alter
disclosures provided in a prior cover page.

The information required in the remainder of this cover page shall not be deemed
to be filled for the purpose of Section 18 of the Securities Exchange Act of
1934 ("Act") or otherwise subject to the liabilities of that section of the Act,
but shall be subject to all other provisions of the Act (however, see the Notes
to Schedule 13G).


                                        1
<PAGE>

- -------------------                                           ------------------
CUSIP No. 452907108                    13G                    Page 2 of 10 Pages
- --------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Paramount Capital Asset Management, Inc.
- --------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                   (a) |_|
                                                                         (b) |_|

- --------------------------------------------------------------------------------
3     SEC USE ONLY

- --------------------------------------------------------------------------------
4     CITIZENSHIP OR PLACE OF ORGANIZATION

      Delaware
- --------------------------------------------------------------------------------
                  5     SOLE VOTING POWER

                        None
                  --------------------------------------------------------------
  NUMBER OF       6     SHARED VOTING POWER
    SHARES
 BENEFICIALLY           2,598,832
   OWNED BY       --------------------------------------------------------------
     EACH         7     SOLE DISPOSITIVE POWER
  REPORTING
    PERSON              None
     WITH         --------------------------------------------------------------
                  8     SHARED DISPOSITIVE POWER

                        2,598,832
- --------------------------------------------------------------------------------
9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      2,598,832
- --------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES*

                                                                             |_|
- --------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      5.6%
- --------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*

      CO
- --------------------------------------------------------------------------------


                                       2
<PAGE>

- -------------------                                           ------------------
CUSIP No. 452907108                    13G                    Page 3 of 10 Pages
- --------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Aries Domestic Fund, L.P.
- --------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                   (a) |_|
                                                                         (b) |_|

- --------------------------------------------------------------------------------
3     SEC USE ONLY

- --------------------------------------------------------------------------------
4     CITIZENSHIP OR PLACE OF ORGANIZATION

      Delaware
- --------------------------------------------------------------------------------
                  5     SOLE VOTING POWER

                        None
                  --------------------------------------------------------------
  NUMBER OF       6     SHARED VOTING POWER
    SHARES
 BENEFICIALLY           727,965
   OWNED BY       --------------------------------------------------------------
     EACH         7     SOLE DISPOSITIVE POWER
  REPORTING
    PERSON              None
     WITH         --------------------------------------------------------------
                  8     SHARED DISPOSITIVE POWER

                        727,965
- --------------------------------------------------------------------------------
9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      727,965
- --------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES*

                                                                             |_|
- --------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      1.6%
- --------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*

      PN
- --------------------------------------------------------------------------------


                                        3
<PAGE>

- -------------------                                           ------------------
CUSIP No. 452907108                    13G                    Page 4 of 10 Pages
- --------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      The Aries Domestic Fund II, L.P.
- --------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                   (a) |_|
                                                                         (b) |_|

- --------------------------------------------------------------------------------
3     SEC USE ONLY

- --------------------------------------------------------------------------------
4     CITIZENSHIP OR PLACE OF ORGANIZATION

      Delaware
- --------------------------------------------------------------------------------
                  5     SOLE VOTING POWER

                        None
                  --------------------------------------------------------------
  NUMBER OF       6     SHARED VOTING POWER
    SHARES
 BENEFICIALLY           56,814
   OWNED BY       --------------------------------------------------------------
     EACH         7     SOLE DISPOSITIVE POWER
  REPORTING
    PERSON              None
     WITH         --------------------------------------------------------------
                  8     SHARED DISPOSITIVE POWER

                        56,814
- --------------------------------------------------------------------------------
9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      56,814
- --------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES*

                                                                             |_|
- --------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      0.1%
- --------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*

      PN
- --------------------------------------------------------------------------------


                                        4
<PAGE>

- -------------------                                           ------------------
CUSIP No. 452907108                    13G                    Page 5 of 10 Pages
- --------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      The Aries Master Fund
- --------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                   (a) |_|
                                                                         (b) |_|

- --------------------------------------------------------------------------------
3     SEC USE ONLY

- --------------------------------------------------------------------------------
4     CITIZENSHIP OR PLACE OF ORGANIZATION

      Cayman Islands
- --------------------------------------------------------------------------------
                  5     SOLE VOTING POWER

                        None
                  --------------------------------------------------------------
  NUMBER OF       6     SHARED VOTING POWER
    SHARES
 BENEFICIALLY           1,814,053
   OWNED BY       --------------------------------------------------------------
     EACH         7     SOLE DISPOSITIVE POWER
  REPORTING
    PERSON              None
     WITH         --------------------------------------------------------------
                  8     SHARED DISPOSITIVE POWER

                        1,814,053
- --------------------------------------------------------------------------------
9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      1,814,053
- --------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES*

                                                                             |_|
- --------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      3.9%
- --------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*

      OO (see Item 2)
- --------------------------------------------------------------------------------


                                        5
<PAGE>

- -------------------                                           ------------------
CUSIP No. 452907108                    13G                    Page 6 of 10 Pages
- --------------------------------------------------------------------------------
1     NAMES OF REPORTING PERSONS
      S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

      Lindsay A. Rosenwald, M.D.
- --------------------------------------------------------------------------------
2     CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP                   (a) |_|
                                                                         (b) |_|

- --------------------------------------------------------------------------------
3     SEC USE ONLY

- --------------------------------------------------------------------------------
4     CITIZENSHIP OR PLACE OF ORGANIZATION

      United States
- --------------------------------------------------------------------------------
                  5     SOLE VOTING POWER

                        None
                  --------------------------------------------------------------
  NUMBER OF       6     SHARED VOTING POWER
    SHARES
 BENEFICIALLY           2,765,499
   OWNED BY       --------------------------------------------------------------
     EACH         7     SOLE DISPOSITIVE POWER
  REPORTING
    PERSON              None
     WITH         --------------------------------------------------------------
                  8     SHARED DISPOSITIVE POWER

                        2,765,499
- --------------------------------------------------------------------------------
9     AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

      2,765,499
- --------------------------------------------------------------------------------
10    CHECK BOX IF THE AGGREGATE AMOUNT IN ROW 11 EXCLUDES CERTAIN SHARES*

                                                                             |_|
- --------------------------------------------------------------------------------
11    PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

      6.0%
- --------------------------------------------------------------------------------
12    TYPE OF REPORTING PERSON*

      IN
- --------------------------------------------------------------------------------


                                        6
<PAGE>

ITEM 1(a). NAME OF ISSUER:

      Immunomedics, Inc.

ITEM 1(b). ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES:

      300 American Road, Morris Plains, New Jersey 07950

ITEM 2(a) NAME OF PERSON FILING:

      This statement is filed on behalf of Paramount Capital Asset Management,
      Inc. ("Paramount Capital"), Aries Domestic Fund, L.P. ("Aries Domestic"),
      Aries Domestic Fund II, L.P. ("Aries II"), Aries Master Fund, a Cayman
      Island exempted company ("Aries Fund") and Lindsay A. Rosenwald, M.D.
      ("Dr. Rosenwald" and collectively, "Reporting Parties"). See attached
      Exhibit A which is a copy of their agreement in writing to file this
      statement on behalf of each of them.

      Dr. Rosenwald is an investment banker, venture capitalist, fund manager
      and sole stockholder of Paramount Capital,(1) a Subchapter S corporation
      incorporated in Delaware. Paramount Capital is the General Partner to each
      of Aries Domestic,(2) and Aries Domestic II, limited partnerships
      incorporated in Delaware. Paramount Capital is the Investment Manager to
      Aries Fund,(3) a Cayman Islands exempted company.

      Dr. Rosenwald, Paramount Capital, Aries Domestic and Aries Fund and their
      respective officers, directors, general partners, investment managers, or
      trustees have not, during the five years prior to the date hereof, been
      convicted in a criminal proceeding (excluding traffic violations or
      similar misdemeanors).

ITEM 2(b) ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE:

      Paramount Capital's, Aries Domestic's, Aries II's, and Dr. Rosenwald's
      business address is 787 Seventh Avenue, 48th Floor, New York, New York,
      10019. The business address for Aries Fund is c/o MeesPierson (Cayman)
      Limited, P.O. Box 2003, British American Centre, Phase 3, Dr. Roy's Drive,
      George Town, Grand Cayman.

ITEM 2(c). CITIZENSHIP:

- --------

(1)   Please see attached Exhibit B indicating the executive officers and
      directors of Paramount Capital and providing information called for by
      Items 2-6 of this statement as to said officers and directors. Exhibit B
      is herein incorporated by reference.

(2)   Please see attached Exhibit C indicating the general partner to each of
      Aries Domestic and Aries II and the general partner's executive officers
      and directors and providing information called for by Items 2-6 of this
      statement as to said general partners, officers and directors. Exhibit C
      is herein incorporated by reference.

(3)   Please see attached Exhibit D indicating the investment manager of the
      Aries Fund and the investment manager's executive officers and directors
      and providing information called for by Items 2-6 of this statement as to
      said investment manager and officers and directors. Exhibit D is herein
      incorporated by reference.


                                        7
<PAGE>

            Dr. Rosenwald is a citizen of the United States of America.

ITEM 2(d).  TITLE OF CLASS OF SECURITIES:

            Common Stock, par value $0.01 per share.

ITEM 2(e).  CUSIP NUMBER: 452907108

ITEM 3.     |_| CHECK THIS BOX IF THIS STATEMENT IS FILED PURSUANT TO RULE
            13d- 1(c)

ITEM 4.     OWNERSHIP

            For information concerning the ownership of Common Stock of the
            Company by the Reporting Persons, see Items 5 through 9 and 11 of
            the cover pages to this schedule 13G and footnotes thereto.

ITEM 5.     OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS

            Not applicable

ITEM 6.     OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON

            Not applicable

ITEM 7.     IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED
            THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY

            Not Applicable

ITEM 8.     IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP

            Not Applicable

ITEM 9.     NOTICE OF DISSOLUTION OF GROUP

            Not Applicable

ITEM 10.    CERTIFICATION

            By signing below I certify that, to the best of my knowledge and
            belief, the securities referred to above were not acquired and are
            not held for the purpose of or with the effect of changing or
            influencing the control of the issuer of the securities and were not
            acquired and are not held in connection with or as a participant in
            a transaction having that purpose and effect.

Material to be Filed as Exhibits:

Exhibit A - Copy of an Agreement between Dr. Rosenwald, Paramount Capital,
            Aries Domestic and Aries Fund to file this Statement on Schedule
            13G on behalf of each of them.

Exhibit B - List of executive officers and directors of Paramount Capital and
            information called for by


                                        8
<PAGE>

            Items 2-6 of this statement relating to said officers and directors.

Exhibit C - List of executive officers and directors of Aries Domestic and Aries
            II and information called for by Items 2-6 of this statement
            relating to said officers and directors.

Exhibit D - List of executive officers and directors of Aries Fund and
            information called for by Items 2-6 of this statement relating to
            said officers and directors.


                                        9
<PAGE>

                                   SIGNATURES

After reasonable inquiry and to the best of my knowledge and belief, I certify
that the information set forth in this statement is true, complete and correct.

                              PARAMOUNT CAPITAL ASSET MANAGEMENT, INC.

Dated:
New York, NY                  By /s/ Lindsay A. Rosenwald, M.D.
                                 -----------------------------------------------
                              Name:  Lindsay A. Rosenwald, M.D.
                              Title: Chairman

                              ARIES DOMESTIC FUND, L.P.
                              By Paramount Capital Asset Management, Inc.,
                              General Partner

Dated:
New York, NY                  By /s/ Lindsay A. Rosenwald, M.D.
                                 -----------------------------------------------
                              Name:  Lindsay A. Rosenwald, M.D.
                              Title: Chairman

                              ARIES DOMESTIC FUND, II L.P.
                              By Paramount Capital Asset Management, Inc.,
                              General Partner

Dated:
New York, NY                  By /s/ Lindsay A. Rosenwald, M.D.
                                 -----------------------------------------------
                              Name:  Lindsay A. Rosenwald, M.D.
                              Title: Chairman

                              THE ARIES MASTER FUND
                              By Paramount Capital Asset Management, Inc.
                              Investment Manager

Dated:
New York, NY                  By /s/ Lindsay A. Rosenwald, M.D.
                                 -----------------------------------------------
                              Name:  Lindsay A. Rosenwald, M.D.
                              Title: Chairman

Dated:
New York, NY                  By /s/ Lindsay A. Rosenwald, M.D.
                                 -----------------------------------------------
                              Name:  Lindsay A. Rosenwald, M.D.
                              Title: Chairman


                                       10
<PAGE>

                                    EXHIBIT A

                                    AGREEMENT

                          JOINT FILING OF SCHEDULE 13G

The undersigned hereby agrees to jointly prepare and file with regulatory
authorities a Schedule 13G and any future amendments thereto reporting each of
the undersigned's ownership of securities of Immunomedics, Inc.and hereby affirm
that such Schedule 13G is being filed on behalf of each of the undersigned.

                              PARAMOUNT CAPITAL ASSET MANAGEMENT, INC.

Dated: December 17, 1999
New York, NY                  By /s/ Lindsay A. Rosenwald, M.D.
                                 -----------------------------------------------
                              Name:  Lindsay A. Rosenwald, M.D.
                              Title: Chairman

                              ARIES DOMESTIC FUND, L.P.
                              By Paramount Capital Asset Management, Inc.
                              General Partner

Dated: December 17, 1999
New York, NY                  By /s/ Lindsay A. Rosenwald, M.D.
                                 -----------------------------------------------
                              Name:  Lindsay A. Rosenwald, M.D.
                              Title: Chairman

                              ARIES DOMESTIC FUND II, L.P.
                              By Paramount Capital Asset Management, Inc.
                              General Partner

Dated: December 17, 1999
New York, NY                  By /s/ Lindsay A. Rosenwald, M.D.
                                 -----------------------------------------------
                              Name:  Lindsay A. Rosenwald, M.D.
                              Title: Chairman

                              THE ARIES MASTER FUND
                              By Paramount Capital Asset Management, Inc.
                              Investment Manager

Dated: December 17, 1999
New York, NY                  By /s/ Lindsay A. Rosenwald, M.D.
                                 -----------------------------------------------
                              Name:  Lindsay A. Rosenwald, M.D.
                              Title: Chairman

Dated: December 17, 1999
New York, NY                  By /s/ Lindsay A. Rosenwald, M.D.
                                 -----------------------------------------------
                              Name:  Lindsay A. Rosenwald, M.D.
                              Title: Chairman


                                       11
<PAGE>

                                    EXHIBIT B

The name and principal occupation or employment, which in each instance is with
Paramount Capital Asset Management, Inc. ("Paramount Capital") located at 787
Seventh Avenue, 48th Floor, New York, New York, 10019, of each executive officer
and director of Paramount Capital is as follows:

                              PRINCIPAL OCCUPATION
NAME                          OR EMPLOYMENT
- ----                          -------------

Lindsay A. Rosenwald, M.D.    Chairman of the Board and sole shareholder,
                              Paramount Capital Asset Management, Inc.,
                              Paramount Capital Investments LLC and Paramount
                              Capital, Inc.

Mark C. Rogers, M.D.          President of Paramount Capital Asset Management,
                              Inc., Paramount Capital Investments, LLC, and
                              Paramount Capital, Inc.

Peter Morgan Kash             Director of Paramount Capital Asset Management,
                              Inc., Senior Managing Director, Paramount Capital,
                              Inc.

Dr. Yuichi Iwaki              Director of Paramount Capital Asset Management,
                              Inc., Professor, University of Southern
                              California School of Medicine

Item 2.

During the five years prior to the date hereof, the above person (to the best of
Paramount Capital's knowledge) has not been convicted in a criminal proceeding
(excluding traffic violations or similar misdemeanors). Additionally, during the
five years prior to the date hereof, the above person (to the best of Paramount
Capital's knowledge) has not been a party to a civil proceeding, of a judicial
or administrative body of competent jurisdiction, as a result of which such
person was or is subject to a judgment, decree or final order enjoining future
violations of, or prohibiting or mandating activities subject to, Federal or
State securities laws or finding any violation with respect to such laws.

Items 3-6.

Please refer to Items 3-6 herein reporting the beneficial ownership.


                                       12
<PAGE>

                                    EXHIBIT C

The name and principal occupation or employment of the General Partner of Aries
Domestic and Aries II, which are located at 787 Seventh Avenue, 48th Floor, New
York, New York, 10019, is as follows:

                                             PRINCIPAL OCCUPATION
NAME                                         OR EMPLOYMENT
- ----                                         -------------

Paramount Capital Asset Management, Inc      General Partner; Investment Manager

Exhibit B is hereby incorporated by
reference.

Item 2.

During the five years prior to the date hereof, the above person (to the best of
Aries Domestic's and Aries II's knowledge) has not been convicted in a criminal
proceeding (excluding traffic violations or similar misdemeanors). Additionally,
during the five years prior to the date hereof, the above person (to the best of
Aries Domestic's and Aries II's knowledge) has not been a party to a civil
proceeding, of a judicial or administrative body of competent jurisdiction, as a
result of which such person was or is subject to a judgment, decree or final
order enjoining future violations of, or prohibiting or mandating activities
subject to, Federal or State securities laws or finding any violation with
respect to such laws.

Items 3-6.

Please refer to Items 3-6 herein reporting the beneficial ownership.


                                       13
<PAGE>

                                    EXHIBIT D

The name and principal occupation or employment, which in the case of Paramount
Capital Asset Management, Inc. is located at 787 Seventh Avenue, 48th Floor, New
York, New York, 10019, of each executive officer and director of Aries Fund is
as follows:

PRINCIPAL OCCUPATION
OR EMPLOYMENT                                   NAME
- -------------                                   ----

Paramount Capital Asset Management, Inc.        Investment Manager

MeesPierson (Cayman) Limited                    Administrator
P.O. Box 2003
British American Centre
Phase 3, Dr. Roy's Drive
George Town, Grand Cayman

Exhibit B is hereby incorporated by reference.

Item 2.

During the five years prior to the date hereof, the above person (to the best of
Aries Fund's knowledge) has not been convicted in a criminal proceeding
(excluding traffic violations or similar misdemeanors). Additionally, during the
five years prior to the date hereof, the above person (to the best of Aries
Fund's knowledge) has not been a party to a civil proceeding, of a judicial or
administrative body of competent jurisdiction, as a result of which such person
was or is subject to a judgment, decree or final order enjoining future
violations of, or prohibiting or mandating activities subject to, Federal or
State securities laws or finding any violation with respect to such laws.

Items 3-6.

Please refer to Items 3-6 herein reporting the beneficial ownership.


                                       14



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