IGEN INTERNATIONAL INC /DE
SC 13D/A, 1998-02-03
PATENT OWNERS & LESSORS
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                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 2)*

                            IGEN INTERNATIONAL, INC.
                    ----------------------------------------
                                (Name of Issuer)

                         Common Stock, $0.001 par Value
                    ----------------------------------------
                         (Title of Class of Securities)

                                    449536101
                              -------------------
                                 (CUSIP Number)

                              Stephen M. Vine, Esq.
                    Akin, Gump, Strauss, Hauer & Feld, L.L.P.
                               590 Madison Avenue
                            New York, New York 10022
                                 (212) 872-1000
                    ----------------------------------------
                  (Name, Address and Telephone Number of Person
                Authorized to Receive Notices and Communications)

                                January 29, 1998
                              -------------------
                      (Date of Event which Requires Filing
                               of this Statement)

If the filing person has previously  filed a statement on Schedule 13G to report
the  acquisition  which is the subject of this  Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box [_].

Note: Six copies of this statement, including all exhibits, should be filed with
the  Commission.  See Rule 13d- 1(a) for other  parties to whom copies are to be
sent.

*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 disclosure
provided in a prior cover page.

The information required on the remainder of this cover page shall not be deemed
to be "filed" 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).

                         Continued on following page(s)
                               Page 1 of 24 Pages
                             Exhibit Index: Page 20





- ---------------------
*         Initial filing with respect to Soros Fund  Management  LLC, Mr. George
          Soros and Mr. Stanley F. Druckenmiller.



<PAGE>


                                                              Page 2 of 24 Pages


                                  SCHEDULE 13D

CUSIP No. 449536101

1        Name of Reporting Person
         I.R.S. Identification No. of Above Persons (ENTITIES ONLY)

                  White Rock Capital, Inc.

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [_]
                                                     b.  [x]

3        SEC Use Only

4        Source of Funds*

                  AF

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e) [_]

6        Citizenship or Place of Organization

                  Texas

                           7        Sole Voting Power
 Number of                                  0
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  1,341,349
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   0
    With
                           10       Shared Dispositive Power
                                            1,341,349

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            1,341,349/1/

12       Check Box If the Aggregate Amount in Row (11) Excludes Certain
         Shares*                                                       [x]

13       Percent of Class Represented By Amount in Row (11)

                                    8.67%

14       Type of Reporting Person*

                  CO; IA

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

/1/  See Item 5.


<PAGE>


                                                              Page 3 of 24 Pages


                                  SCHEDULE 13D

CUSIP No. 449536101

1        Name of Reporting Person
         I.R.S. Identification No. of Above Persons (ENTITIES ONLY)

                  White Rock Capital Management, L.P.

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [_]
                                                     b.  [x]

3        SEC Use Only

4        Source of Funds*

                  WC; AF

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e) [_]

6        Citizenship or Place of Organization

                  Texas

                           7        Sole Voting Power
 Number of                                  5,000
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  1,336,349
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   5,000
    With
                           10       Shared Dispositive Power
                                            1,336,349

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            1,341,349/1/

12       Check Box If the Aggregate Amount in Row (11) Excludes Certain
         Shares*                                                       [x]

13       Percent of Class Represented By Amount in Row (11)

                                    8.67%

14       Type of Reporting Person*

                  PN; IA

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

/1/  See Item 5.


<PAGE>


                                                              Page 4 of 24 Pages


                                  SCHEDULE 13D

CUSIP No. 449536101

1        Name of Reporting Person
         I.R.S. Identification No. of Above Persons (ENTITIES ONLY)

                  White Rock Capital Partners, L.P.

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [_]
                                                     b.  [x]

3        SEC Use Only

4        Source of Funds*

                  WC

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e) [_]

6        Citizenship or Place of Organization

                  Texas

                           7        Sole Voting Power
 Number of                                  162,133
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   162,133
    With
                           10       Shared Dispositive Power
                                            0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            162,133/1/

12       Check Box If the Aggregate Amount in Row (11) Excludes Certain
         Shares*                                                       [x]

13       Percent of Class Represented By Amount in Row (11)

                                    1.06%

14       Type of Reporting Person*

                  PN; IV

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

/1/  See Item 5.


<PAGE>


                                                              Page 5 of 24 Pages


                                  SCHEDULE 13D

CUSIP No. 449536101

1        Name of Reporting Person
         I.R.S. Identification No. of Above Persons (ENTITIES ONLY)

                  Thomas U. Barton

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [_]
                                                     b.  [x]

3        SEC Use Only

4        Source of Funds*

                  AF

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e) [_]

6        Citizenship or Place of Organization

                  United States

                           7        Sole Voting Power
 Number of                                  0
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  1,341,349
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   0
    With
                           10       Shared Dispositive Power
                                            1,341,349

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            1,341,349/1/

12       Check Box If the Aggregate Amount in Row (11) Excludes Certain
         Shares*                                                       [x]

13       Percent of Class Represented By Amount in Row (11)

                                            8.67%

14       Type of Reporting Person*

                  IA

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

/1/  See Item 5.


<PAGE>


                                                              Page 6 of 24 Pages


                                  SCHEDULE 13D

CUSIP No. 449536101

1        Name of Reporting Person
         I.R.S. Identification No. of Above Persons (ENTITIES ONLY)

                  Joseph U. Barton

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [_]
                                                     b.  [x]

3        SEC Use Only

4        Source of Funds*

                  AF

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e) [_]

6        Citizenship or Place of Organization

                  United States

                           7        Sole Voting Power
 Number of                                  5,000
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  1,341,349
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   5,000
    With
                           10       Shared Dispositive Power
                                            1,341,349

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            1,346,349/1/

12       Check Box If the Aggregate Amount in Row (11) Excludes Certain
         Shares*                                                       [_]

13       Percent of Class Represented By Amount in Row (11)

                                    8.70%

14       Type of Reporting Person*

                  IN; IA

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

/1/  See Item 5.


<PAGE>

                                                              Page 7 of 24 Pages

                                  SCHEDULE 13D

CUSIP No. 449536101

1        Name of Reporting Person
         I.R.S. Identification No. of Above Persons (ENTITIES ONLY)

                  Soros Fund Management LLC

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [_]
                                                     b.  [x]
3        SEC Use Only

4        Source of Funds*

                  AF

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e) [_]

6        Citizenship or Place of Organization

                  Delaware

                           7        Sole Voting Power
 Number of                                  0
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   0
    With
                           10       Shared Dispositive Power
                                            0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            792,583/1/

12       Check Box If the Aggregate Amount in Row (11) Excludes Certain
         Shares*                                                       [x]

13       Percent of Class Represented By Amount in Row (11)

                                    5.17%

14       Type of Reporting Person*

                  OO; IA

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

/1/  See Item 5.



<PAGE>


                                                              Page 8 of 24 Pages


                                  SCHEDULE 13D

CUSIP No. 449536101

1        Name of Reporting Person
         I.R.S. Identification No. of Above Persons (ENTITIES ONLY)

                  George Soros (in the capacity described herein)

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [_]
                                                     b.  [x]
3        SEC Use Only

4        Source of Funds*

                  AF

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e) [_]

6        Citizenship or Place of Organization

                  United States

                           7        Sole Voting Power
 Number of                                  0
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   0
    With
                           10       Shared Dispositive Power
                                            0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            792,583/1/

12       Check Box If the Aggregate Amount in Row (11) Excludes Certain
         Shares*                                                       [x]

13       Percent of Class Represented By Amount in Row (11)

                                    5.17%

14       Type of Reporting Person*

                  IA

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

/1/  See Item 5.



<PAGE>


                                                              Page 9 of 24 Pages


                                  SCHEDULE 13D

CUSIP No. 449536101

1        Name of Reporting Person
         I.R.S. Identification No. of Above Persons (ENTITIES ONLY)

                  Stanley F. Druckenmiller (in the capacity described herein)

2        Check the Appropriate Box If a Member of a Group*
                                                     a.  [_]
                                                     b.  [x]
3        SEC Use Only

4        Source of Funds*

                  AF

5        Check Box If Disclosure of Legal  Proceedings  Is Required  Pursuant to
         Items 2(d) or 2(e) [_]

6        Citizenship or Place of Organization

                  United States

                           7        Sole Voting Power
 Number of                                  0
   Shares
Beneficially               8        Shared Voting Power
  Owned By                                  0
    Each
  Reporting                9        Sole Dispositive Power
   Person                                   0
    With
                           10       Shared Dispositive Power
                                            0

11       Aggregate Amount Beneficially Owned by Each Reporting Person

                                            792,583/1/

12       Check Box If the Aggregate Amount in Row (11) Excludes Certain
         Shares*                                                       [x]

13       Percent of Class Represented By Amount in Row (11)

                                    5.17%

14       Type of Reporting Person*

                  IA

                      *SEE INSTRUCTIONS BEFORE FILLING OUT!

/1/  See Item 5.

<PAGE>



                                                             Page 10 of 24 Pages


                    This  Amendment  No. 2 to Schedule  13D relates to shares of
Common Stock, $0.001 par value per share (the "Shares"),  of IGEN International,
Inc. (the  "Issuer").  This  Amendment No. 2  supplementally  amends the initial
statement  on Schedule  13D dated  December  11,  1997,  filed by certain of the
Reporting  Persons  (as  defined  herein),  and  Amendment  No. 1 thereto  dated
December 29, 1997, filed by certain of the Reporting Persons (collectively,  the
"Initial  Statement").  This Statement constitutes an initial filing to Schedule
13D for SFM LLC (as  defined  herein),  Mr.  Soros (as  defined  herein) and Mr.
Druckenmiller (as defined herein). This Amendment No. 2 is being filed to report
that as a result of recent  acquisitions of Shares of the Issuer,  the number of
Shares of which  certain of the Reporting  Persons may be deemed the  beneficial
owners has increased by more than one percent of the total  outstanding  Shares.
Capitalized  terms used herein but not defined  herein  shall have the  meanings
ascribed  to  them  in  the  Initial   Statement.   The  Initial   Statement  is
supplementally amended as follows.


Item 2.             Identity and Background.

                    This Statement is being filed by Soros Fund  Management LLC,
a Delaware limited liability company ("SFM LLC"), Mr. George Soros ("Mr. Soros")
and Mr.  Stanley F.  Druckenmiller  ("Mr.  Druckenmiller"),  White Rock Capital,
Inc., a Texas corporation  ("White Rock, Inc."),  White Rock Capital Management,
L.P., a Texas limited partnership ("White Rock Management"),  White Rock Capital
Partners,  L.P., a Texas limited partnership ("White Rock Partners"),  Thomas U.
Barton  and Joseph U.  Barton  (collectively,  the  "Reporting  Persons").  This
Statement  relates to securities  acquired by White Rock Management on behalf of
certain institutional  clients (the "White Rock Clients"),  pursuant to separate
investment  advisory  contracts  (collectively,   the  "White  Rock  Contracts),
including  Quantum Partners (as defined herein).  This Statement also relates to
securities held for the accounts of White Rock Partners and Joseph U. Barton.

                    SFM LLC has its principal office at 888 Seventh Avenue, 33rd
Floor,  New York, New York 10106.  The business of SFM LLC is managed  through a
Management  Committee (the "Management  Committee")  comprised of Mr. Soros, Mr.
Druckenmiller  and Mr.  Gary  Gladstein.  Its  principal  business  is to serve,
pursuant to contract,  as the principal  investment  manager to several  foreign
investment  companies (the "SFM  Clients"),  including  Quantum Fund (as defined
herein) and Quantum  Partners,  the  principal  operating  subsidiary of Quantum
Fund. SFM LLC has been granted investment discretion over portfolio investments,
including  the Shares,  held for the account of Quantum  Partners  LDC, a Cayman
Islands exempted limited duration company ("Quantum  Partners") and Quantum Fund
N.V., a Netherlands  Antilles company ("Quantum Fund"). Each of Quantum Fund and
Quantum  Partners has its  principal  office at Kaya  Flamboyan  9,  Willemstad,
Curacao,  Netherlands  Antilles.  SFM  LLC's  contracts  with  the  SFM  Clients
generally provide that SFM LLC is responsible for designing and implementing the
SFM Clients'  overall  investment  strategies;  for conducting  direct portfolio
management  strategies  to  the  extent  that  SFM  LLC  determines  that  it is
appropriate to utilize its own portfolio management capabilities; for selecting,
evaluating  and  monitoring  other  investment   advisors  who  manage  separate
portfolios on behalf of the SFM Clients; and for allocating and reallocating the
SFM  Clients'  assets  among the  outside  managers  and itself.  In  connection
therewith,  Quantum  Partners has granted  investment  discretion  to White Rock
Management  pursuant to an investment advisory contract between Quantum Partners
and White Rock  Management (the "Quantum  Partners-White  Rock  Contract").  The
Shares  currently held for the account of Quantum  Partners were acquired at the
direction  of White  Rock  Management,  and none of SFM LLC,  Mr.  Soros and Mr.
Druckenmiller currently exercises voting or dispositive power over the Shares.

                    Mr. Soros, as Chairman of SFM LLC, has the ability to direct
the investment decisions of SFM LLC and as such may be deemed to have investment



<PAGE>


                                                             Page 11 of 24 Pages


discretion  over the  Shares  held for the  account  of  Quantum  Partners.  Mr.
Druckenmiller,  as Lead Portfolio  Manager of SFM LLC, has the ability to direct
the investment decisions of SFM LLC and as such may be deemed to have investment
discretion over the Shares held for the account of Quantum  Partners.  Set forth
in Annex A hereto and  incorporated  by reference in response to this Item 2 and
elsewhere in this Schedule 13D as applicable is a list of the Managing Directors
of SFM LLC.

                    The  principal  occupation  of Mr.  Soros,  a United  States
citizen,  is his direction of the activities of SFM LLC, which is carried out in
his capacity as Chairman of SFM LLC at SFM LLC's principal office.

                    The  principal  occupation  of Mr.  Druckenmiller,  a United
States  citizen,  is his position as Lead Portfolio  Manager and a Member of the
Management  Committee  of SFM LLC,  which is carried out at SFM LLC's  principal
office.

                    Pursuant to regulations  promulgated  under Section 13(d) of
the Act,  SFM LLC,  Mr.  Soros,  in his capacity as Chairman of SFM LLC, and Mr.
Druckenmiller, in his capacity as Lead Portfolio Manager of SFM LLC, each may be
deemed a beneficial owner of the Shares held for the account of Quantum Partners
as a result of the  contractual  authority  of SFM LLC to  exercise  voting  and
dispositive power with respect to such Shares.

                    The  general  partner of White Rock  Partners  is White Rock
Capital  Management,  the general  partner of which is White Rock,  Inc. Each of
White Rock (as defined herein),  White Rock Partners,  White Rock Management and
White  Rock,  Inc.  is  engaged  in the  investment  and  investment  management
business.  Thomas U. Barton and Joseph U. Barton, both of whom are United States
citizens,  are the shareholders of White Rock, Inc. The principal  occupation of
each of Thomas U. Barton and Joseph U. Barton is their  position as the officers
of White Rock Inc. at White Rock Inc.'s principal office. The principal business
address of each of White Rock Partners, White Rock Management, White Rock, Inc.,
Thomas U. Barton and Joseph U. Barton is 3131 Turtle Creek Boulevard, Suite 800,
Dallas, Texas 75219.

                    During the past five years,  none of the Reporting  Persons,
Quantum Partners and, to the best of the Reporting Persons' knowledge, any other
person  identified  in  response  to this  Item 2 has  been (a)  convicted  in a
criminal proceeding, or (b) a party to any civil proceeding as a result of which
he has been  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.

                    The Reporting  Persons are making this single,  joint filing
pursuant to Rule 13d-1(f) of Regulation 13D-G under the Securities  Exchange Act
of 1934,  as amended (the "Act");  however,  neither the fact of this filing nor
any  information  contained  herein shall be deemed to be an admission by any of
the Reporting Persons that a group exists within the meaning of Section 13(d)(3)
of the Act.

                    Information  contained herein concerning SFM LLC, Mr. Soros,
Mr.  Druckenmiller,  Quantum Fund and Quantum  Partners has been provided by SFM
LLC. White Rock,  Inc., White Rock  Management,  White Rock Partners,  Thomas U.
Barton and  Joseph U.  Barton  assume no  responsibility  for such  information.
Information contained herein concerning White Rock, Inc., White Rock Management,
White Rock Partners,  Thomas U. Barton and Joseph U. Barton has been provided by
White  Rock  Management.  SFM LLC,  Mr.  Soros and Mr.  Druckenmiller  assume no
responsibility for such information.





<PAGE>


                                                             Page 12 of 24 Pages


Item 3.             Source and Amount of Funds or Other Consideration.

                    White Rock Management expended  approximately  $3,681,338 of
the working capital of the White Rock Clients,  other than Quantum Partners,  to
purchase the Shares  reported  herein as being  acquired since December 29, 1997
(the  date of  filing  of the  last  Statement  on  Schedule  13D).  White  Rock
Management expended approximately $93,125 of its working capital to purchase the
Shares  reported  herein as being  acquired since December 29, 1997 (the date of
filing of the last Statement on Schedule 13D).

                    The Shares (and securities  derivative  thereof) held by the
Reporting  Persons  for the  accounts of Quantum  Partners  and other White Rock
Clients,  by White  Rock  Partners,  by White Rock  Management  and by Joseph U.
Barton may be held through margin accounts maintained with brokers, which extend
margin  credit as and when  required to open or carry  positions in their margin
accounts, subject to applicable federal margin regulations, stock exchange rules
and such  firm's  credit  policies.  The Shares  which may be held in the margin
accounts are pledged as collateral  security for the repayment of debit balances
in the respective accounts.

Item 4.             Purpose of Transaction.

                    All  of  the  Shares  (and  securities  derivative  thereof)
reported  herein as having been acquired for or disposed of from the accounts of
Quantum Partners, the other White Rock Clients,  White Rock Partners,  Thomas U.
Barton  and  Joseph U.  Barton  were  acquired  or  disposed  of for  investment
purposes.  Neither Quantum Partners, the other White Rock Clients, the Reporting
Persons  nor,  to the  best of their  knowledge,  any of the  other  individuals
identified  in response to Item 2, has any plans or proposals  that relate to or
would result in any of the transactions  described in subparagraphs  (a) through
(j) of Item 4 of Schedule 13D.

                    The Reporting Persons reserve the right to acquire, or cause
to be acquired,  additional securities of the Issuer, to dispose, or cause to be
disposed of, such securities at any time or to formulate  other purposes,  plans
or proposals regarding the Issuer or any of its securities, to the extent deemed
advisable in light of general  investment and trading  policies of the Reporting
Persons,  Quantum  Partners,   and/or  the  other  White  Rock  Clients,  market
conditions or other factors.

Item 5.             Interest in Securities of the Issuer.

                    (a)  (i) As a consequence SFM LLC's ability to terminate the
Quantum Partners-White Rock Contract with respect to all investments,  including
those involving the Shares,  and acquire voting and  dispositive  power over the
Shares within 60 days,  notwithstanding the fact that none of SFM LLC, Mr. Soros
and Mr. Druckenmiller currently exercises such power, SFM LLC, Mr. Soros and Mr.
Druckenmiller   may  be  deemed  the   beneficial   owner  of   792,583   Shares
(approximately  5.17% of the total number of Shares  which would be  outstanding
assuming conversion of all of the Series B Stock held for the account of Quantum
Partners).  This number assumes the conversion of 2,500 shares of Series B Stock
(which are convertible within 60 days) into 179,083 Shares.

                         (ii) Each of White Rock,  Inc.,  White Rock  Management
and Thomas U.  Barton may be deemed the  beneficial  owner of  1,341,349  Shares
(approximately  8.67% of the total number of Shares  which would be  outstanding
assuming  conversion  of all of the Series B Stock held for the  accounts of the
White Rock Clients,  including Quantum Partners, and White Rock Partners).  This
number consists of (1) 792,583 Shares held for the account of Quantum  Partners,
(2) 381,633  Shares held for the accounts of the White Rock Clients,  other than
Quantum  Partners  (assumes  the  conversion  of 1,000  shares of Series B Stock
(which are convertible within 60 days) into 71,633 Shares) and


<PAGE>


                                                             Page 13 of 24 Pages


(3)  162,133  Shares held for the account of White Rock  Partners  (assumes  the
conversion  of 1,000 shares of Series B Stock (which are  convertible  within 60
days) into 71,633 Shares).

                         (iii)Joseph  U.  Barton  may be deemed  the  beneficial
owner of  1,346,349  Shares  (approximately  8.70% of the total number of Shares
outstanding  assuming  conversion  of all of the  Series  B Stock  held  for the
accounts of the White Rock Clients,  including Quantum Partners,  and White Rock
Partners).  This number  consists of (1) 792,583  Shares held for the account of
Quantum  Partners,  (2) 381,633  Shares held for the  accounts of the White Rock
Clients, other than Quantum Partners, (3) 162,133 Shares held for the account of
White Rock Partners and (4) 5,000 Shares held for his account.

                         (iv) White Rock  Partners may be deemed the  beneficial
owner of the 162,133  Shares held for its  account  (approximately  1.06% of the
total number of Shares  outstanding  assuming  conversion of all of the Series B
Stock held for the account of White Rock Partners).

                    (b)  (i)  Each of White  Rock  Management  (pursuant  to the
Quantum-White Rock Contract),  White Rock, Inc. (as the general partner of White
Rock  Management),  Thomas U. Barton (as a shareholder of White Rock,  Inc.) and
Joseph U. Barton (as a shareholder of White Rock, Inc.) is currently vested with
shared power to direct the voting and disposition of the 792,583 Shares held for
the account Quantum Partners. SFM LLC has the contractual authority on behalf of
Quantum  Partners to terminate the  Quantum-White  Rock Contract  within 60 days
and, as a result, SFM LLC, Mr. Soros and Mr. Druckenmiller may be deemed to have
the  ability to acquire  the  voting  and  dispositive  power held by White Rock
Management with respect to the 792,583 Shares.

                         (ii) Each of White  Rock  Management  (pursuant  to the
White Rock  Contracts,  other than the Quantum  Partners-White  Rock  Contract),
White Rock,  Inc. (as the general partner of White Rock  Management),  Thomas U.
Barton  (as a  shareholder  of White  Rock,  Inc.) and  Joseph U.  Barton  (as a
shareholder of White Rock, Inc.) is currently vested with shared power to direct
the voting and  disposition  of the 381,633  Shares held for the accounts of the
White Rock Clients, other than Quantum Partners.

                         (iii)Each of  White  Rock  Management  (as the  general
partner of White Rock  Partners),  White Rock,  Inc. (as the general  partner of
White Rock Management),  Thomas U. Barton (as a shareholder of White Rock, Inc.)
and Joseph U. Barton (as a  shareholder  of White  Rock,  Inc.) may be deemed to
have shared  power to direct the voting and  disposition  of the 162,133  Shares
held for the account of White Rock Partners.

                         (iv) Each of White Rock,  Inc. (as the general  partner
of White Rock  Management),  Thomas U. Barton (as a  shareholder  of White Rock,
Inc.) and Joseph U. Barton (as a shareholder of White Rock,  Inc.) may be deemed
to have shared  power to direct the voting and  disposition  of the 5,000 Shares
held for the account of White Rock Management.

                         (v)  Joseph U.  Barton has the sole power to direct the
voting and disposition of the 5,000 Shares held for his account.

                         (vi) White Rock  Partners  has the sole power to direct
the voting and disposition of the 162,133 Shares held for its account.

                         (vii)White  Rock  Management  has  the  sole  power  to
direct the voting and disposition of the 5,000 Shares held for its account.

                    (c)       Except for the  transactions  disclosed on Annex B
hereto,  all of which were  effected in the  over-the-counter  market in routine




<PAGE>


                                                             Page 14 of 24 Pages

respect to the  brokerage  transactions,  there have been no  transactions  with
Shares  since  December  5, 1997 (the  date of filing of the last  statement  on
Schedule 13D) by any of the Reporting Persons or Quantum Partners.

                    (d)  (i) The  shareholders  of Quantum  Partners,  including
Quantum Fund, have the right to participate in the receipt of dividends from, or
proceeds from the sale of, the Shares,  held for the account of Quantum Partners
in accordance with their ownership interests in Quantum Partners.

                         (ii) The  shareholders or partners of each of the White
Rock Clients,  other than Quantum Partners) have the right to participate in the
receipt of dividends from, or proceeds from the sale of, the Shares, held by the
respective  White Rock Client in accordance with their  partnership or ownership
interests in the respective White Rock Client.

                         (iii)Joseph   U.   Barton   has  the   sole   right  to
participate in the receipt of dividends  from, or proceeds from the sale of, the
Shares held for his account.

                         (iv) The partners of White Rock Partners have the right
to participate  in the receipt of dividends  from, or proceeds from the sale of,
the Shares held by White Rock  Partners  in  accordance  with their  partnership
interests in White Rock Partners.

                         (v)  The  partners  of White Rock  Management  have the
right to participate in the receipt of dividends from, or proceeds from the sale
of,  the  Shares  held  by  White  Rock  Management  in  accordance  with  their
partnership interests in White Rock Management.

                    (e) Not applicable.

Item 6.             Contracts, Arrangements, Understandings in Relationship with
                    Respect to Securities of the Issuer.

                    From  time to time,  each of the  Reporting  Persons  and/or
Quantum  Partners  may lend  portfolio  securities  to  brokers,  banks or other
financial  institutions.  These loans typically  obligate the borrower to return
the  securities,  or an equal  amount of  securities  of the same class,  to the
lender and  typically  provide that the borrower is entitled to exercise  voting
rights and to retain dividends during the term of the loan. From time to time to
the extent  permitted by applicable  laws,  each of such persons or entities may
borrow the  Shares for the  purpose of  effecting,  and may  effect,  short sale
transactions,  and may purchase  securities for the purpose of closing out short
positions in such securities.

                    Except as set forth  herein,  the Reporting  Persons  and/or
Quantum  Partners do not have any  contracts,  arrangements,  understandings  or
relationships with respect to any securities of the Issuer.

Item 7.             Material to be Filed as Exhibits.

          A.        Joint Filing  Agreement  dated February 3, 1997 by and among
SFM  LLC,  Mr.  Soros,  Mr.  Druckenmiller,  White  Rock  Partners,  White  Rock
Management, White Rock, Inc., Thomas U. Barton and Joseph U. Barton.

          B.        Form of Purchase  Agreement  dated as of  December  16, 1997
(filed  as  Exhibit  B to the  Initial  Statement  and  incorporated  herein  by
reference).


<PAGE>


                                                             Page 15 of 24 Pages



          C.        Form of Registration  Rights  Agreement dated as of December
16, 1997 (filed as Exhibit C to the Initial Statement and incorporated herein by
reference).

          D.        Power of Attorney dated as of January 1, 1997 granted by Mr.
Soros in favor of Mr. Sean C. Warren and Mr. Michael C. Neus.

          E.        Power of Attorney dated as of January 1, 1997 granted by Mr.
Druckenmiller in favor of Mr. Sean C. Warren and Mr. Michael C. Neus.






<PAGE>


                                                             Page 16 of 24 Pages


                                   SIGNATURES

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

Date:  February 3, 1998                 SOROS FUND MANAGEMENT LLC

                                        By:  /S/ MICHAEL C. NEUS
                                             -----------------------------
                                             Michael C. Neus
                                             Assistant General Counsel


                                        GEORGE SOROS

                                        By:  /S/ MICHAEL C. NEUS
                                             -----------------------------
                                             Michael C. Neus
                                             Attorney-in-Fact


                                        STANLEY F. DRUCKENMILLER

                                        By:  /S/ MICHAEL C. NEUS
                                             -----------------------------
                                             Michael C. Neus
                                             Attorney-in-Fact


                                        WHITE ROCK CAPITAL PARTNERS, L.P.

                                        By:  White Rock Capital Management, L.P.
                                             Its General Partner

                                             By:  White Rock Capital, Inc.
                                                  Its General Partner

                                                  By:  /S/ THOMAS U. BARTON
                                                       ------------------------
                                                       Thomas U. Barton
                                                       President



<PAGE>


                                                             Page 17 of 24 Pages



                                        WHITE ROCK CAPITAL MANAGEMENT. L.P.

                                        By:  White Rock Capital Inc.
                                             Its General Partner

                                             By:  /S/ THOMAS U. BARTON
                                                  -----------------------------
                                                  Thomas U. Barton
                                                  President


                                        WHITE ROCK CAPITAL, INC.

                                             By:  /S/ THOMAS U. BARTON
                                                  -----------------------------
                                                  Thomas U. Barton
                                                  President


                                        /S/ THOMAS U. BARTON
                                        ---------------------------------------
                                        Thomas U. Barton



                                        /S/ JOSEPH U. BARTON
                                        ---------------------------------------
                                        Joseph U. Barton


<PAGE>


                                                             Page 18 of 24 Pages


                                     ANNEX A


                    The  following  is a list of all of the persons  (other than
Stanley Druckenmiller) who serve as Managing Directors of SFM LLC:


                               Scott K. H. Bessent
                                 Walter Burlock
                                Brian J. Corvese
                               Jeffrey L. Feinberg
                                  Arminio Fraga
                                 Gary Gladstein
                                    Ron Hiram
                                Robert K. Jermain
                                 David N. Kowitz
                               Alexander C. McAree
                                  Paul McNulty
                              Gabriel S. Nechamkin
                                   Steven Okin
                                  Dale Precoda
                               Lief D. Rosenblatt
                                 Mark D. Sonnino
                             Filiberto H. Verticelli
                                 Sean C. Warren


Each of the  above-listed  persons is a United States  citizen  whose  principal
occupation  is serving as Managing  Director of SFM LLC, and each has a business
address c/o Soros Fund Management LLC, 888 Seventh Avenue, 33rd Floor, New York,
New York 10106.

To the best of the Reporting Persons' knowledge:

         (a)  None of the above persons holds any Shares.
         (b)  None  of  the  above  persons  has  any  contracts,  arrangements,
understandings or relationships with respect to the Shares.





<PAGE>
<TABLE>
<CAPTION>


                                                                                                     Page 19 of 24 Pages


                                                         ANNEX B

                                       RECENT TRANSACTIONS IN THE COMMON STOCK OF
                                                IGEN INTERNATIONAL, INC.

                                                                                  Number of
                                                                                   Shares/
                                       Date of              Nature of              Option               Price Per
For the Account of                   Transaction           Transaction            Contracts            Share/Option
- ------------------                   -----------           -----------            ---------            ------------
<S>                                  <C>                   <C>                    <C>                  <C>

White Rock Clients/1/
(other than Quantum
Partners)                             01/12/98                 BUY                 20,000                $13.232
                                      01/13/98                 BUY                 23,500                $13.702
                                      01/14/98                 BUY                  7,000                $14.051
                                      01/16/98                 BUY                 10,000                $15.554
                                      01/20/98                 BUY                 10,000                 $17.10
                                      01/22/98                 BUY                 14,000                 $17.31
                                      01/23/98                 BUY                 20,000                $16.785
                                      01/26/98                 BUY                 10,000                $16.649
                                      01/27/98                 BUY                  5,000                 $17.03
                                      01/27/98                 BUY                  5,000                 $17.03
                                      01/28/98                 BUY                 10,000                $17.185
                                      01/29/98                 BUY                 20,000                $18.625
                                      01/29/98                 BUY                 45,000                $18.625
                                      01/29/98                 BUY                 20,000                $18.625

White Rock                            01/29/98                 BUY                  5,000                $18.625
Management


















/1/      Transactions effected at the direction of White Rock Management.

</TABLE>
<PAGE>


                                                             Page 20 of 24 Pages



                                  EXHIBIT INDEX



A.                  Joint Filing Agreement dated February 3, 1998
                    by and among Soros Fund  Management  LLC, Mr.
                    George    Soros    and   Mr.    Stanley    F.
                    Druckenmiller................................         21

D.                  Power of Attorney dated as of January 1, 1997
                    granted by Mr.  George  Soros in favor of Mr.
                    Sean   C.   Warren   and   Mr.   Michael   C.
                    Neus.........................................          23

E.                  Power of Attorney dated as of January 1, 1997
                    granted by Mr.  Stanley F.  Druckenmiller  in
                    favor of Mr. Sean C.  Warren and Mr.  Michael
                    C. Neus......................................          24







                                                             Page 21 of 24 Pages


                                    EXHIBIT A

                             JOINT FILING AGREEMENT

                    The undersigned  hereby agree that the statement on Schedule
13D with respect to the Common Stock of Igen International,  Inc. dated February
3, 1998 is, and any amendments  thereto signed by each of the undersigned  shall
be, filed on behalf of us pursuant to and in accordance  with the  provisions of
Rule 13d-1(f) under the Securities Exchange Act of 1934.


Date:  February 3, 1998                 SOROS FUND MANAGEMENT LLC

                                        By:  /S/ MICHAEL C. NEUS
                                             -----------------------------
                                             Michael C. Neus
                                             Assistant General Counsel


                                        GEORGE SOROS

                                        By:  /S/ MICHAEL C. NEUS
                                             -----------------------------
                                             Michael C. Neus
                                             Attorney-in-Fact


                                        STANLEY F. DRUCKENMILLER

                                        By:  /S/ MICHAEL C. NEUS
                                             -----------------------------
                                             Michael C. Neus
                                             Attorney-in-Fact


                                        WHITE ROCK CAPITAL PARTNERS, L.P.

                                        By:  White Rock Capital Management, L.P.
                                             Its General Partner

                                             By:  White Rock Capital, Inc.
                                                  Its General Partner

                                                  By:  /S/ THOMAS U. BARTON
                                                       ------------------------
                                                       Thomas U. Barton
                                                       President



<PAGE>


                                                             Page 22 of 24 Pages



                                        WHITE ROCK CAPITAL MANAGEMENT. L.P.

                                        By:  White Rock Capital Inc.
                                             Its General Partner

                                             By:  /S/ THOMAS U. BARTON
                                                  -----------------------------
                                                  Thomas U. Barton
                                                  President


                                        WHITE ROCK CAPITAL, INC.

                                             By:  /S/ THOMAS U. BARTON
                                                  -----------------------------
                                                  Thomas U. Barton
                                                  President


                                        /S/ THOMAS U. BARTON
                                        ---------------------------------------
                                        Thomas U. Barton



                                        /S/ JOSEPH U. BARTON
                                        ---------------------------------------
                                        Joseph U. Barton



                                                             Page 23 of 24 Pages


                                    EXHIBIT D

                                POWER OF ATTORNEY


KNOW ALL MEN BY THESE PRESENTS,  that I, GEORGE SOROS,  hereby make,  constitute
and appoint each of SEAN C. WARREN and MICHAEL C. NEUS, acting individually,  as
my agent and attorney-in-fact for the purpose of executing in my name, (a) in my
personal  capacity or (b) in my capacity as Chairman  of,  member of or in other
capacities  with  Soros  Fund  Management  LLC,  all  documents,   certificates,
instruments,  statements,  filings and agreements ("documents") to be filed with
or  delivered  to any foreign or domestic  governmental  or  regulatory  body or
required or  requested  by any other  person or entity  pursuant to any legal or
regulatory  requirement  relating to the acquisition,  ownership,  management or
disposition of securities or other investments, and any other documents relating
or ancillary  thereto,  including but not limited to, all documents  relating to
filings with the United States  Securities and Exchange  Commission  (the "SEC")
pursuant to the Securities  Act of 1933 or the  Securities  Exchange Act of 1934
(the "Act") and the rules and regulations promulgated thereunder, including: (1)
all documents relating to the beneficial  ownership of securities required to be
filed  with  the SEC  pursuant  to  Section  13(d) or  Section  16(a) of the Act
including, without limitation: (a) any acquisition statements on Schedule 13D or
Schedule  13G and  any  amendments  thereto,  (b) any  joint  filing  agreements
pursuant to Rule  13d-1(f) and (c) any initial  statements  of, or statements of
changes in,  beneficial  ownership of securities on Form 3, Form 4 or Form 5 and
(2) any  information  statements  on Form 13F  required to be filed with the SEC
pursuant to Section 13(f) of the Act.

All past acts of the attorney-in-fact in furtherance of the foregoing are hereby
ratified and confirmed.

This power of attorney shall be valid from the date hereof until revoked by me.

IN  WITNESS  WHEREOF,  I have  executed  this  instrument  as of the  1st day of
January, 1997.




                                /s/ George Soros
                                --------------------------------
                                GEORGE SOROS





                                                             Page 24 of 24 Pages

                                    EXHIBIT E

                                POWER OF ATTORNEY


KNOW ALL MEN BY THESE PRESENTS,  that I, STANLEY F. DRUCKENMILLER,  hereby make,
constitute  and  appoint  each of SEAN C.  WARREN and  MICHAEL  C. NEUS,  acting
individually,  as my agent and  attorney-in-fact for the purpose of executing in
my name,  (a) in my personal  capacity  or (b) in my capacity as Lead  Portfolio
Manager of, member of or in other capacities with Soros Fund Management LLC, all
documents,  certificates,   instruments,   statements,  filings  and  agreements
("documents")  to be  filed  with  or  delivered  to  any  foreign  or  domestic
governmental  or regulatory body or required or requested by any other person or
entity  pursuant  to  any  legal  or  regulatory  requirement  relating  to  the
acquisition,  ownership,  management  or  disposition  of  securities  or  other
investments,  and any other documents relating or ancillary  thereto,  including
but not limited to, all  documents  relating to filings  with the United  States
Securities and Exchange Commission (the "SEC") pursuant to the Securities Act of
1933 or the  Securities  Exchange  Act of 1934  (the  "Act")  and the  rules and
regulations promulgated thereunder, including: (1) all documents relating to the
beneficial ownership of securities required to be filed with the SEC pursuant to
Section 13(d) or Section 16(a) of the Act including, without limitation: (a) any
acquisition  statements  on  Schedule  13D or  Schedule  13G and any  amendments
thereto,  (b) any joint filing agreements  pursuant to Rule 13d-1(f) and (c) any
initial  statements  of, or  statements of changes in,  beneficial  ownership of
securities  on Form 3, Form 4 or Form 5 and (2) any  information  statements  on
Form 13F required to be filed with the SEC pursuant to Section 13(f) of the Act.

All past acts of the attorney-in-fact in furtherance of the foregoing are hereby
ratified and confirmed.

This power of attorney shall be valid from the date hereof until revoked by me.

IN  WITNESS  WHEREOF,  I have  executed  this  instrument  as of the  1st day of
January, 1997.




                                                /s/ Stanley F. Druckenmiller
                                                -------------------------------
                                                STANLEY F. DRUCKENMILLER




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