ZWEIG DIMENNA PARTNERS L P
SC 13D, 1997-08-06
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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.  )*
                                            

                              Redwood Trust, Inc.
         -------------------------------------------------------------
                                (Name of Issuer)

                                 Common Stock
              ---------------------------------------------------
                        (Title of Class of Securities)

                                   758075402
                   -----------------------------------------
                                 (CUSIP Number)

      Stuart B. Panish c/o Zweig-DiMenna Associates LLC, 900 Third Avenue
                   New York, New York 10022  (212) 451-1100
- --------------------------------------------------------------------------------
(Name, Address and Telephone Number of Person Authorized to Receive Notices and 
Communications)

                                 July 28, 1997
                  -------------------------------------------
            (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 [_].

Check the following box if a fee is being paid with this statement [_]. (A fee
is not required only if the filing person: (1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7).

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
disclosures provided in a prior cover page.

The information required in 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).
<PAGE>
 
                                 SCHEDULE 13D

CUSIP No. 758075402  


1  NAME OF REPORTING PERSON
   S.S. or I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

        Zweig-DiMenna Special Opportunities, L.P.
        Zweig-DiMenna Partners, L.P.
        Zweig-DiMenna International Limited
        Zweig-DiMenna International Managers, Inc., on behalf of a
         discretionary account       
        Gotham Advisors, Inc., on behalf of a discretionary account


2  CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*                 (a) [_]
                                                                     (b) [_]

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
    
        Zweig-DiMenna Special Opportunities, L.P. - Delaware
        Zweig-DiMenna Partners, L.P. - New York    
        Zweig-DiMenna International Limited - British Virgin Islands
        Zweig-DiMenna International Managers, Inc. - Delaware
        Gotham Advisors, Inc. - Delaware


NUMBER OF SHARES BENEFICIALLY OWNED BY EACH REPORTING PERSON WITH

7  SOLE VOTING POWER
 
        Zweig-DiMenna Special Opportunities, L.P.-133,700
        Zweig-DiMenna International Limited-479,700
        Zweig-DiMenna International Managers, Inc., on behalf of a discretionary
         account-109,400
        Zweig-DiMenna Partners, L.P.-215,800
        Gotham Advisors, Inc., on behalf of a discretionary account-60,400

                
8  SHARED VOTING POWER
        
        0                 

9  SOLE DISPOSITIVE POWER
                  
        Zweig-DiMenna Special Opportunities, L.P.-133,700
        Zweig-DiMenna International Limited-479,700
        Zweig-DiMenna International Managers, Inc., on behalf of a discretionary
         account-109,400
        Zweig-DiMenna Partners, L.P.-215,800
        Gotham Advisors, Inc., on behalf of a discretionary account-60,400

10  SHARED DISPOSITIVE POWER

        0

11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        Zweig-DiMenna Special Opportunities, L.P.-133,700
        Zweig-DiMenna International Limited-479,700
        Zweig-DiMenna International Managers, Inc., on behalf of a discretionary
         account-109,400
        Zweig-DiMenna Partners, L.P.-215,800
        Gotham Advisors, Inc., on behalf of a discretionary account-60,400

12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                          [_]
                
13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
        
        Total-6.7%
        
        Zweig-DiMenna Special Opportunities, L.P.-0.9%
        Zweig-DiMenna International Limited-3.2%
        Zweig-DiMenna International Managers, Inc., on behalf of a discretionary
         account-0.7%
        Zweig-DiMenna Partners, L.P.-1.5%
        Gotham Advisors, Inc., on behalf of a discretionary account-0.4%

14 TYPE OF REPORTING PERSON*
        
        Zweig-DiMenna Special Opportunities, L.P. - PN
        Zweig-DiMenna Partners, L.P. - PN
        Zweig-DiMenna International Limited - CO
        Zweig-DiMenna International Managers, Inc. - CO
        Gotham Advisors, Inc. - CO

<PAGE>
 
                                 SCHEDULE 13D


ITEM 1  SECURITY AND ISSUER
        
        Redwood Trust, Inc.                    
        591 Redwood Highway, Suite 3100        
        Mill Valley, California 94941          
        Common Stock, par value $.01 per share. 

ITEM 2  IDENTITY AND BACKGROUND
                
A.      Zweig-DiMenna Special Opportunities, L.P.

        Zweig-DiMenna Special Opportunities, L.P., a Delaware limited
        partnership, is a private investment partnership which seeks
        appreciation of the Partnership's assets for the benefit of its
        partners. The address of its principal business and its principal office
        is 900 Third Avenue, New York, New York 10022. The following information
        is provided as to each general partner of Zweig-DiMenna Special
        Opportunities, L.P.:

        1.  Zweig-DiMenna Associates LLC, a New York limited liability company,
            is the managing general partner of Zweig-DiMenna Special
            Opportunities, L.P. Its principal business and office address is 900
            Third Avenue, New York, New York 10022. Its managing directors are
            Martin E. Zweig and Joseph A. DiMenna, and its principals are Brenda
            M. Earl, Carol R. Whitehead and Jeffrey R. Perry. Dr. Zweig, Mr.
            DiMenna, Ms. Earl, Ms. Whitehead and Mr. Perry are the sole members
            of Zweig-DiMenna Associates LLC. The following information is
            provided as to each of the above mentioned managing directors and
            principals.
        
        i)  a)  Name - Martin E. Zweig.

            b)  Residence or Business Address - 900 Third Avenue, New York, New
                York 10022.
 
            c)  Present Principal Occupation, etc. - Dr. Zweig is Chairman of
                the Board and President of The Zweig Fund, Inc. and The Zweig
                Total Return Fund, Inc., each of which is a New York Stock
                Exchange listed investment company. He is also President of
                Zweig Advisors Inc., Zweig Total Return Advisors, Inc., Gotham
                Advisors, Inc., Zweig Associates, Inc., Zweig-DiMenna
                International Managers, Inc. and Zweig Securities Advisory
                Service, Inc. He is Chairman of Euclid Advisors LLC. He is
                President of the Zweig Series Trust mutual fund and Chairman of
                Zweig/Glaser Advisers, the investment manager of the Zweig
                Series Trust. Dr. Zweig is a Managing Director of the Managing
                General Partner of Zweig-DiMenna Partners, L.P. and Zweig-
                DiMenna Special Opportunities, L.P., 
<PAGE>
 
                each of which is an investment partnership. The business address
                of the principal entities referred to above is 900 Third Avenue,
                New York, New York 10022.

            d)  Dr.  Zweig is a citizen of the United States.
        
       ii)  a)  Name - Joseph A. DiMenna.

            b)  Residence or Business Address - 900 Third Avenue, New York, New
                York 10022.
 
            c)  Present Principal Occupation, etc. - Mr. DiMenna is a Managing
                Director of the Managing General Partner of Zweig-DiMenna
                Partners, L.P. and Zweig-DiMenna Special Opportunities, L.P.,
                Executive Vice President and Treasurer of Zweig Associates,
                Inc., Executive Vice President of Zweig-DiMenna International
                Managers, Inc. and Vice President of Gotham Advisors, Inc. The
                business address of the principal entities referred to above is
                900 Third Avenue, New York, New York 10022.

            d)  Mr. DiMenna is a citizen of the United States.
        
      iii)  a)  Name - Brenda M. Earl.

            b)  Residence or Business Address - 900 Third Avenue, New York, New
                York 10022.

            c)  Present Principal Occupation, etc. - Ms. Earl is a Principal of
                the Managing General Partner of Zweig-DiMenna Partners, L.P. and
                Zweig-DiMenna Special Opportunities, L.P., Vice President -
                Research of Zweig Associates, Inc., and Vice President -
                Research of Zweig-DiMenna International Managers, Inc. The
                business address of the principal entities referred to above is
                900 Third Avenue, New York, New York 10022.

            d)  Ms. Earl is a citizen of the United States.

       iv)  a)  Name - Carol R. Whitehead.

            b)  Residence or Business Address - 900 Third Avenue, New York, New
                York 10022.

            c)  Present Principal Occupation, etc. - Ms. Whitehead is a
                Principal of the Managing General Partner of Zweig-DiMenna
                Partners, L.P. and Zweig-DiMenna Special Opportunities, L.P.,
                Vice President - Marketing of Zweig Associates, Inc., and Vice
                President - Business Development of Zweig-DiMenna International
                Managers, Inc. The business address of the principal entities
                referred to above is 900 Third Avenue, New York, New York 10022.
<PAGE>
 
            d)  Ms. Whitehead is a citizen of the United States.

        v)  a)  Name - Jeffrey R. Perry.

            b)  Residence or Business Address - 900 Third Avenue, New York, New
                York 10022.

            c)  Present Principal Occupation, etc. - Mr. Perry is a Principal of
                the Managing General Partner of Zweig-DiMenna Partners, L.P. and
                Zweig-DiMenna Special Opportunities, L.P., Vice President -
                Research of Zweig Associates, Inc., and Vice President -
                Research of Zweig-DiMenna International Managers, Inc. The
                business address of the principal entities referred to above is
                900 Third Avenue, New York, New York 10022.

            d)  Mr. Perry is a citizen of the United States.

        2.  Zweig Associates, Inc., a New York corporation, is a general partner
            of Zweig-DiMenna Special Opportunities, L.P. Its principal business
            and office address is 900 Third Avenue, New York, New York 10022.
            Martin E. Zweig is President, Joseph A. DiMenna is Executive Vice
            President, Carol R. Whitehead is Vice President - Marketing and
            Brenda M. Earl and Jeffrey R. Perry is each a Vice President -
            Research of Zweig Associates, Inc. Martin E. Zweig, Joseph A.
            DiMenna and Carol Whitehead are the directors and shareholders of
            Zweig Associates, Inc. Reference is made to Item 2.A.1, above, for
            information about such individuals.

            None of the above, i.e., Zweig- DiMenna Special Opportunities, L.P.,
            Zweig-DiMenna Associates LLC, Zweig Associates, Inc., Martin E.
            Zweig, Joseph A. DiMenna, Brenda M. Earl, Carol R. Whitehead or
            Jeffrey R. Perry has, during the last five years, (i) been convicted
            in a criminal proceeding (excluding traffic violations or similar
            misdemeanors) or (ii) been a party to a civil proceeding of a
            judicial or administrative body of competent jurisdiction and as a
            result of such proceeding 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.
        
B.      Zweig-DiMenna International Limited                                 
                                                                                
        Zweig-DiMenna International Limited is incorporated in the Territory of
        the British Virgin Islands. Its business is investing and trading
        primarily in U.S. equity securities. The address of its principal
        business and its principal office is Maritime House, Frederick Street,
        Suite 200, P.O. Box N-9932, Nassau, Bahamas. The following information
        is provided as to each executive officer and director of such
        corporation, each person controlling such corporation and each executive
        officer
<PAGE>
 
            and director of any corporation or other person ultimately in
            control of such corporation:

        1.  a)  Name - Cedric B. Moss, Managing Director.

            b)  Residence or Business Address - c/o Dominion Management Services
                Limited, P.O. Box N-9932, Maritime House, Frederick Street,
                Nassau, Bahamas.
  
            c)  Present Principal Occupation, etc. - Mr. Moss is President of
                Dominion Management Services Limited, the Administrator of 
                Zweig-DiMenna International Limited. The business address of the
                entity referred to above is Dominion Management Services
                Limited, P.O. Box N-9932, Maritime House, Frederick Street,
                Nassau, Bahamas.

            d)  Mr. Moss is a Bahamian citizen.


        2.  a)  Name - Frederick A. Mitchell, Director.
 
            b)  Residence or Business Address - P.O. Box N3928, Gwendolyn House,
                Nassau, Bahamas.
 
            c)  Present Principal Occupation, etc. - Mr. Mitchell is a
                practicing attorney in the firm Gwendolyn House in Nassau. He is
                a Senator in the Senate of the Commonwealth of The Bahamas. 

            d)  Mr. Mitchell is a Bahamian citizen.
 
        3.  a)  Name - Michael D. Riegels, Director.
 
            b)  Residence or Business Address - Harney, Westwood & Riegels,
                Craigmuir Chambers, P.O. Box 71, Road Town, Tortola, British
                Virgin Islands.
                
            c)  Present Principal Occupation, etc. - Mr. Riegels is the Senior
                Partner of the law firm of Harney, Westwood & Riegels.

            d)  Mr. Riegels is a British Dependent Territories Citizen.

        4.  Zweig-DiMenna International Managers, Inc. - the Investment Manager
            of Zweig-DiMenna International Limited. It is incorporated under the
            laws of the State of Delaware. Its principal business address and
            the address of its principal office is 900 Third Avenue, New York,
            New York 10022. Dr. Martin E. Zweig and Mr. Joseph A. DiMenna are
            the directors and principal officers, and Ms. Carol R Whitehead is
            Vice President - Business Development, and Ms. Brenda M. Earl and
            Mr. Jeffrey R. Perry is each a Vice President - Research, of Zweig-
            DiMenna International Managers, Inc. Martin E. Zweig and Joseph A.
            DiMenna are the 
<PAGE>
 
            principal stockholders of Zweig-DiMenna International Managers, Inc.
            Reference is made to Item 2.A.1, above, for information about such
            individuals.

            None of the above, i.e., Zweig-DiMenna International Limited, Cedric
            B. Moss, Frederick A. Mitchell, Michael D. Riegels, or Zweig-DiMenna
            International Managers, Inc. has, during the last five years, (i)
            been convicted in a criminal proceeding (excluding traffic
            violations or similar misdemeanors) or (ii) been a party to a civil
            proceeding of a judicial or administrative body of competent
            jurisdiction and as a result of such proceeding 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.
        
C.      Zweig-DiMenna Partners, L.P., a New York limited partnership, is a
        private investment partnership which seeks appreciation of the
        Partnership's assets for the benefit of its partners. The address of its
        principal business and its principal office is 900 Third Avenue, New
        York, New York 10022. The following information is provided as to each
        general partner of Zweig-DiMenna Partners, L.P.:

        1.  Zweig-DiMenna Associates LLC is the managing general partner of
            Zweig-DiMenna Partners, L.P. Reference is made to Item 2.A.1, above,
            for information about Zweig-DiMenna Associates LLC and its managing
            directors, principals and members.

        2.  Zweig Associates, Inc. is a general partner of Zweig-DiMenna
            Partners, L.P. Reference is made to Item 2.A.2, above, for
            information about Zweig Associates, Inc. and its directors, officers
            and shareholders.

            None of the above, i.e., Zweig-DiMenna Partners, L.P., Zweig-DiMenna
            Associates LLC, Zweig Associates, Inc., Martin E. Zweig, Joseph A.
            DiMenna, Brenda M. Earl, Carol R. Whitehead or Jeffrey R. Perry has,
            during the last five years, (i) been convicted in a criminal
            proceeding (excluding traffic violations or similar misdemeanors) or
            (ii) been a party to a civil proceeding of a judicial or
            administrative body of competent jurisdiction and as a result of
            such proceeding 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.
        
D.      Zweig-DiMenna International Managers, Inc., investment manager for a
        foreign discretionary account. Reference is made to Item 2.B.4, above,
        for information about Zweig-DiMenna International Managers, Inc. and its
        officers, directors and stockholders.

        None of the above, i.e., Zweig-DiMenna International Mangers, Inc.,
        Martin E. Zweig, Joseph A. DiMenna, Brenda M. Earl, Carol R. Whitehead
        or Jeffrey R. 
<PAGE>
 
        Perry has, during the last five years, (i) been convicted in a criminal
        proceeding (excluding traffic violations or similar misdemeanors) or
        (ii) been a party to a civil proceeding of a judicial or administrative
        body of competent jurisdiction and as a result of such proceeding 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.
        
E.      Gotham Advisors, Inc., investment manager for an ERISA plan
        discretionary account. It is incorporated under the laws of the State of
        Delaware. Its principal business address and the address of its
        principal office is 900 Third Avenue, New York, New York 10022. Dr.
        Martin E. Zweig is the sole director, and Dr. Zweig and Mr. Joseph A.
        DiMenna are the principal officers, of Gotham Advisors, Inc. Dr. Zweig,
        Mr. DiMenna and Ms. Brenda M. Earl are the stockholders of Gotham
        Advisors, Inc. Reference is made to Item 2.A.1, above, for information
        about such individuals.

        None of the above, i.e., Gotham Advisors, Inc., Martin E. Zweig, Joseph
        A. DiMenna or Brenda M. Earl has, during the last five years, (i) been
        convicted in a criminal proceeding (excluding traffic violations or
        similar misdemeanors) or (ii) been a party to a civil proceeding of a
        judicial or administrative body of competent jurisdiction and as a
        result of such proceeding 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.
        
ITEM 3  SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATIONS

        The securities of Redwood Trust, Inc. were purchased at an aggregate
        cost of $44,369,283 with the investment capital of Zweig-DiMenna Special
        Opportunities, L.P., Zweig-DiMenna International Limited, Zweig-DiMenna
        Partners, L.P., the discretionary account managed by Zweig-DiMenna
        International Managers, Inc. (the "ZDIM Account") and the discretionary
        account managed by Gotham Advisors, Inc. (the "Gotham Account"). No part
        of the purchase price was made up of borrowed funds or funds otherwise
        obtained for the purpose of acquiring, holding, trading or voting such
        securities.

ITEM 4  PURPOSE OF TRANSACTION

        Transactions for the purchase of shares of Common Stock (the "Shares")
        of Redwood Trust, Inc. (the "Company") were executed by Zweig-DiMenna
        Special Opportunities, L.P., Zweig-DiMenna International Limited, Zweig-
        DiMenna Partners, L.P., the ZDIM Account and the Gotham Account (the
        "Investors") for investment purposes only. The Investors continue to
        evaluate their ownership and voting position in the Company and may
        consider the following future courses of action: (i) continuing to hold
        the Shares for investment; (ii) disposing of all or a portion of the
        Shares in open market sales or in privately negotiated transactions; or
        (iii) acquiring additional shares of common stock in 
<PAGE>
 
        the open market or in privately negotiated transactions. The Investors
        have not as yet determined which of the courses of action specified in
        this paragraph they may ultimately take. The Investors' future actions
        with regard to this investment in the Company are dependent upon their
        evaluation of a variety of circumstances affecting the Company in the
        future, including the market price of the Company's common stock, the
        Company's prospects and their own portfolios.

        Other than as described above, the Investors do not have any present
        plans or proposals which relate to or would result in any of the
        following (although they reserve the right to develop such plans or
        proposals): a) the acquisition by any person of additional securities of
        the Company, or the disposition of securities of the Company; b) an
        extraordinary corporate transaction, such as a merger, reorganization or
        liquidation, involving the Company or any of its subsidiaries; c) a sale
        or transfer of a material amount of assets of the Company or any of its
        subsidiaries; d) any change in the present board of directors or
        management of the Company, including any plans or proposals to change
        the number or term of directors or to fill any existing vacancies on the
        board; e) any material change in the present capitalization or dividend
        policy of the Company; f) any other material change in the Company's
        business or corporate structure; g) changes in the Company's charter, 
        by-laws or instruments corresponding thereto or other actions which may
        impede the acquisition or control of the Company by any person; h)
        causing a class of securities of the Company to be delisted from a
        national securities exchange or to cease to be authorized to be quoted
        in an inter-dealer quotation system of a registered national securities
        association; i) a class of equity securities of the Company becoming
        eligible for termination of registration pursuant to Section 12(g)(4) of
        the Securities Exchange Act of 1934; or j) any action similar to those
        enumerated above.
        
ITEM 5  INTEREST IN SECURITIES OF THE ISSUER

        a.  Aggregate number of shares beneficially owned:

                
                Zweig-DiMenna Special Opportunities, L.P.      -      133,700
 
                Zweig-DiMenna International Limited            -      479,700
 
                Zweig-DiMenna Partners, L.P.                   -      215,800   
                                                                      
                ZDIM Account                                   -      109,400 
                                                                      
                Gotham Account                                 -      60,400  
                                                                      
            Percent of class beneficially owned:                    
                                                                      
                Zweig-DiMenna Special Opportunities, L.P.      -      0.9%  
            
                Zweig-DiMenna International Limited            -      3.2%   
<PAGE>
 
                Zweig-DiMenna Partners, L.P.                   -      1.5%   
                                                                      
                ZDIM Account                                   -      0.7%   
                                                                      
                Gotham Account                                 -      0.4%   

        b.  Number of shares as to which there is sole power to vote:
 
                Zweig-DiMenna Special Opportunities, L.P.      -      133,700  
                                                                      
                Zweig-DiMenna International Limited            -      479,700  
                                                                      
                Zweig-DiMenna Partners, L.P.                   -      215,800  
                                                                      
                ZDIM Account                                   -      109,400  
                                                                      
                Gotham Account                                 -      60,400   
                                                                      
            Number of shares as to which there is shared power to vote or to 
            direct the vote:

                Zweig-DiMenna Special Opportunities, L.P.      -      0        
                                                                      
                Zweig-DiMenna International Limited            -      0        
                                                                      
                Zweig-DiMenna Partners, L.P.                   -      0        
                                                                      
                ZDIM Account                                   -      0        
                                                                      
                Gotham Account                                 -      0         
          
            Number of shares as to which there is sole power to dispose or to 
            direct the disposition:
 
                Zweig-DiMenna Special Opportunities, L.P.      -      133,700 
                                                                      
                Zweig-DiMenna International Limited            -      479,700 
                                                                      
                Zweig-DiMenna Partners, L.P.                   -      215,800 
                                                                      
                ZDIM Account                                   -      109,400 
                                                                      
                Gotham Account                                 -      60,400  
<PAGE>
 
            Number of shares as to which there is shared power to dispose or
            to direct the disposition:     
                                                                              
                Zweig-DiMenna Special Opportunities, L.P.      -      0     
                                                                      
                Zweig-DiMenna International Limited            -      0     
                                                                      
                Zweig-DiMenna Partners, L.P.                   -      0     
                                                                      
                ZDIM Account                                   -      0     
                                                                      
                Gotham Account                                 -      0      
        
        c.  Since May 29, 1997 Zweig-DiMenna Special Opportunities, L.P., Zweig-
            DiMenna International Limited, Zweig-DiMenna Partners, L.P., the
            ZDIM Account and the Gotham Account purchased, as indicated, the
            Shares on the open market on the following dates and at the
            following prices and in the following amounts:

                ZWEIG-DIMENNA SPECIAL OPPORTUNITIES, L.P.

                DATE        DESCRIPTION OF PURCHASE

                6/24/97     Purchased 5,300 shares at $47.3750 a share  

                6/27/97     Purchased 15,000 shares at $45.6250 a share 
                                                                        
                7/1/97      Purchased 5,000 shares at $45.50 a share    
                                                                        
                7/1/97      Purchased 5,000 shares at $46.00 a share    
                                                                        
                7/2/97      Purchased 12,000 shares at $45.6250 a share 
                                                                        
                7/25/97     Purchased 44,700 shares at $45.00 a share   
                                                                        
                7/28/97     Purchased 16,000 shares at $44.3333 a share 
                                                                        
                7/28/97     Purchased 5,300 shares at $44.8158 a share  
                                                                        
                7/28/97     Purchased 700 shares at $44.7825 a share    
                                                                        
                7/29/97     Purchased 3,300 shares at $44.2750 a share  
                                                                        
                7/30/97     Purchased 3,300 shares at $44.90 a share    
                                                                        
                7/31/97     Purchased 10,000 shares at $41.7008 a share 
<PAGE>
 
                8/1/97      Purchased 2,700 shares at $42.00 a share    
                                                                        
                8/4/97      Purchased 5,400 shares at $41.6719 a share  
                                                                        
                ZWEIG-DIMENNA INTERNATIONAL LIMITED                     
                                                                        
                DATE        DESCRIPTION OF PURCHASE                     
                                                                        
                6/11/97     Purchased 13,800 shares at $52.3750 a share 
                                                                        
                6/12/97     Purchased 11,100 shares at $52.6125 a share 
                                                                        
                6/13/97     Purchased 27,600 shares at $48.8825 a share 
                                                                        
                6/16/97     Purchased 24,600 shares at $46.6806 a share 
                                                                        
                6/19/97     Purchased 13,800 shares at $49.310 a share  
                                                                        
                6/23/97     Purchased 27,600 shares at $48.6250 a share 
                                                                        
                6/24/97     Purchased 19,200 shares at $47.375 a share  
                                                                        
                7/25/97     Purchased 31,800 shares at $45.00 a share   
                                                                        
                7/28/97     Purchased 57,800 shares at $44.3333 a share 
                                                                        
                7/28/97     Purchased 18,800 shares at $44.8158 a share 
                                                                        
                7/28/97     Purchased 2,400 shares at $44.7825 a share  
                                                                        
                7/29/97     Purchased 12,100 shares at $44.2750 a share 
                                                                        
                7/30/97     Purchased 12,100 shares at $44.90 a share   
                                                                        
                7/31/97     Purchased 36,200 shares at $41.7008 a share 
                                                                        
                8/1/97      Purchased 9,600 shares at $42.00 a share    
                                                                        
                8/4/97      Purchased 19,300 shares at $41.6719 a share 
                                                                        
<PAGE>
 
                ZWEIG-DIMENNA PARTNERS, L.P.                            
                                                                        
                DATE        DESCRIPTION OF PURCHASE                     
                                                                        
                6/11/97     Purchased 6,500 shares at $52.3750 a share  
                                                                        
                6/12/97     Purchased 5,200 shares at $52.6125 a share  
                                                                        
                6/13/97     Purchased 13,100 shares at $48.8825 a share 
                                                                        
                6/16/97     Purchased 11,400 shares at $46.6806 a share 
                                                                        
                6/19/97     Purchased 6,200 shares at $49.310 a share   
                                                                        
                6/23/97     Purchased 12,500 shares at $48.6250 a share 
                                                                        
                6/24/97     Purchased 8,700 shares at $47.375 a share   
                                                                        
                7/25/97     Purchased 17,300 shares at $45.00 a share   
                                                                        
                7/28/97     Purchased 25,900 shares at $44.3333 a share 
                                                                        
                7/28/97     Purchased 8,500 shares at $44.8158 a share  
                                                                        
                7/28/97     Purchased 1,100 shares at $44.7825 a share  
                                                                        
                7/29/97     Purchased 5,400 shares at $44.2750 a share  
                                                                        
                7/30/97     Purchased 5,400 shares at $44.90 a share    
                                                                        
                7/31/97     Purchased 16,100 shares at $41.7008 a share 
                                                                        
                8/1/97      Purchased 4,300 shares at $42.00 a share    
                                                                        
                8/4/97      Purchased 8,600 shares at $41.6719 a share  
                                                                        
                ZDIM ACCOUNT                                            
                                                                        
                DATE        DESCRIPTION OF PURCHASE                     
                                                                        
                6/11/97     Purchased 3,000 shares at $52.3750 a share  

                6/12/97     Purchased 2,400 shares at $52.6125 a share  
<PAGE>
 
                6/13/97     Purchased 6,000 shares at $48.8825 a share  
                                                                        
                6/16/97     Purchased 5,800 shares at $46.6806 a share  
                                                                        
                6/19/97     Purchased 3,200 shares at $49.310 a share   
                                                                        
                6/23/97     Purchased 6,400 shares at $48.6250 a share  
                                                                        
                6/24/97     Purchased 4,400 shares at $47.375 a share   
                                                                        
                7/25/97     Purchased 8,800 shares at $45.00 a share    
                                                                        
                7/28/97     Purchased 13,100 shares at $44.3333 a share 
                                                                        
                7/28/97     Purchased 4,300 shares at $44.8158 a share  
                                                                        
                7/28/97     Purchased 500 shares at $44.7825 a share    
                                                                        
                7/29/97     Purchased 2,700 shares at $44.2750 a share  
                                                                        
                7/30/97     Purchased 2,700 shares at $44.90 a share    
                                                                        
                7/31/97     Purchased 8,200 shares at $41.7008 a share  
                                                                        
                8/1/97      Purchased 2,200 shares at $42.00 a share    
                                                                        
                8/4/97      Purchased 4,300 shares at $41.6719 a share  
                                                                        
                GOTHAM ACCOUNT                                          
                                                                        
                DATE        DESCRIPTION OF PURCHASE                     
                                                                        
                6/11/97     Purchased 1,700 shares at $52.3750 a share  
                                                                        
                6/12/97     Purchased 1,300 shares at $52.6125 a share  
                                                                        
                6/13/97     Purchased 3,300 shares at $48.8825 a share  
                                                                        
                6/16/97     Purchased 3,200 shares at $46.6806 a share  

                6/19/97     Purchased 1,800 shares at $49.310 a share   
                                                                        
                6/23/97     Purchased 3,500 shares at $48.6250 a share  
                                                                        
                6/24/97     Purchased 2,400 shares at $47.375 a share   
<PAGE>
 
                7/25/97     Purchased 5,100 shares at $45.00 a share    
                                                                        
                7/28/97     Purchased 7,200 shares at $44.3333 a share  
                                                                        
                7/28/97     Purchased 2,400 shares at $44.8158 a share  
                                                                        
                7/28/97     Purchased 300 shares at $44.7825 a share    
                                                                        
                7/29/97     Purchased 1,500 shares at $44.2750 a share  
                                                                        
                7/30/97     Purchased 1,500 shares at $44.90 a share    
                                                                        
                7/31/97     Purchased 4,500 shares at $41.7008 a share  
                                                                        
                8/1/97      Purchased 2,200 shares at $42.00 a share    
                                                                        
                8/4/97      Purchased 2,400 shares at $41.6719 a share  
                
        d.  Not applicable.

        e.  Not applicable.

ITEM 6  CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO
        SECURITIES OF THE ISSUER

        None.

ITEM 7  MATERIAL TO BE FILED AS EXHIBITS

        Exhibit A - Joint Filing Agreement among Zweig-DiMenna Special
        Opportunities, L.P., Zweig-DiMenna International Limited, Zweig-DiMenna
        Partners, L.P., Zweig-DiMenna International Managers, Inc. and Gotham
        Advisors, Inc.
<PAGE>
 
                                   SIGNATURE


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.


Date: August 5, 1997


                       ZWEIG-DiMENNA INTERNATIONAL LIMITED


                       By:  Zweig-DiMenna International Managers, Inc.,
                            Investment Manager


                       By:  /s/  Joseph A. DiMenna
                          ------------------------------
                          Name:  Joseph A. DiMenna
                          Title: Executive Vice President


                       ZWEIG-DiMENNA PARTNERS, L.P.


                       By:  Zweig-DiMenna Associates LLC,
                            Managing General Partner


                       By:  /s/  Joseph A. DiMenna
                          ------------------------------
                          Name:  Joseph A. DiMenna
                          Title: Managing Director of Managing General Partner 


                       ZWEIG-DiMENNA SPECIAL OPPORTUNITIES, L.P.
        

                       By:  Zweig-DiMenna Associates LLC,
                            Managing General Partner


                       By:  /s/  Joseph A. DiMenna
                          ------------------------------
                          Name:  Joseph A. DiMenna
                          Title: Managing Director of Managing General Partner


                       ZWEIG-DiMENNA INTERNATIONAL MANAGERS, INC.


                       By:  /s/  Joseph A. DiMenna
                          ------------------------------
                          Name:  Joseph A. DiMenna
                          Title: Executive Vice President


                       GOTHAM ADVISORS, INC.


                       By:  /s/  Joseph A. DiMenna
                          ------------------------------
                          Name:  Joseph A. DiMenna
                          Title: Vice President
<PAGE>
 
                                                                       EXHIBIT A

                     JOINT FILING AGREEMENT AMONG INVESTORS

        
     This Joint Filing Agreement is entered into this fifth day of August, 1997
by Zweig-DiMenna International Limited, a British Virgin Islands corporation,
Zweig-DiMenna Partners, L.P., a New York limited partnership, Zweig-DiMenna
Special Opportunities, L.P., a Delaware limited partnership, Zweig-DiMenna
International Managers, Inc., a Delaware corporation, and Gotham Advisors, Inc.,
a Delaware corporation, collectively the "Investors".  In lieu of filing
separate statements on Schedule 13D, the Investors hereby agree to file a joint
statement on Schedule 13D pursuant to Rule 13d-1(f)(1) under the Exchange Act of
1934 with respect to the Common Stock of Redwood Trust, Inc.

     This Agreement shall be filed as an exhibit to the statement on Schedule
13D filed on behalf of the Investors and constitutes the Investors' consent to
file a joint Schedule 13D.


                        ZWEIG-DiMENNA INTERNATIONAL LIMITED                
                                                                           
                                                                           
                        By:  Zweig-DiMenna International Managers, Inc.,   
                             Investment Manager                            
                                                                           
                                                                           
                        By:  /s/  Joseph A. DiMenna                        
                           ------------------------------                  
                           Name:  Joseph A. DiMenna                        
                           Title: Executive Vice President                 
                                                                           
                                                                           
                        ZWEIG-DiMENNA PARTNERS, L.P.                       
                                                                           
                                                                           
                        By:  Zweig-DiMenna Associates LLC,                 
                             Managing General Partner                      
                                                                           
                                                                           
                        By:  /s/  Joseph A. DiMenna                        
                           ------------------------------                  
                           Name:  Joseph A. DiMenna                         
                           Title: Managing Director of Managing General Partner
                                                                               
                                                                               
                        ZWEIG-DiMENNA SPECIAL OPPORTUNITIES, L.P.              
                                                                               
                                                                               
                        By:  Zweig-DiMenna Associates LLC,                     
                             Managing General Partner                          
                                                                               
                                                                               
                        By:  /s/  Joseph A. DiMenna                            
                           ------------------------------                      
                           Name:  Joseph A. DiMenna                            
                           Title: Managing Director of Managing General Partner
                                                                               
                                                                               
                        ZWEIG-DiMENNA INTERNATIONAL MANAGERS, INC.             
                                                                               
                                                                             
                        By:  /s/  Joseph A. DiMenna                          
                           ------------------------------                    
                           Name:  Joseph A. DiMenna                          
                           Title: Executive Vice President                   
                                                                             
                                                                             
                        GOTHAM ADVISORS, INC.                                
                                                                             
                                                                             
                        By:  /s/  Joseph A. DiMenna                          
                           ------------------------------                    
                           Name:  Joseph A. DiMenna                          
                           Title: Vice President                             


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