ZWEIG DIMENNA PARTNERS L P
SC 13D/A, 1997-09-17
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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. 3)*
                                            

                              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)

                               September 15, 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.-13,800
        Zweig-DiMenna International Limited-487,500
        Zweig-DiMenna International Managers, Inc., on behalf of a discretionary
         account-107,600
        Zweig-DiMenna Partners, L.P.-21,900
        Gotham Advisors, Inc., on behalf of a discretionary account-60,700

                
8  SHARED VOTING POWER
        
        0                 

9  SOLE DISPOSITIVE POWER
                  
        Zweig-DiMenna Special Opportunities, L.P.-13,800
        Zweig-DiMenna International Limited-487,500
        Zweig-DiMenna International Managers, Inc., on behalf of a discretionary
         account-107,600
        Zweig-DiMenna Partners, L.P.-21,900
        Gotham Advisors, Inc., on behalf of a discretionary account-60,700

10  SHARED DISPOSITIVE POWER

        0

11  AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

        Zweig-DiMenna Special Opportunities, L.P.-13,800
        Zweig-DiMenna International Limited-487,500
        Zweig-DiMenna International Managers, Inc., on behalf of a discretionary
         account-107,600
        Zweig-DiMenna Partners, L.P.-21,900
        Gotham Advisors, Inc., on behalf of a discretionary account-60,700

12 CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES CERTAIN SHARES*
                                                                          [_]
                
13 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 11
        
        Total-4.7%
        
        Zweig-DiMenna Special Opportunities, L.P.-0.1%
        Zweig-DiMenna International Limited-3.3%
        Zweig-DiMenna International Managers, Inc., on behalf of a discretionary
         account-0.7%
        Zweig-DiMenna Partners, L.P.-0.2%
        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 - AMENDMENT NO. 3


       Zweig-DiMenna Special Opportunities, L.P., Zweig-DiMenna International
Limited, Zweig-DiMenna Partners, L.P., Zweig-DiMenna International Managers,
Inc. and Gotham Advisors, Inc. hereby amend the Schedule 13D, filed with respect
to shares of common stock, par value $.01 per share ("Shares") of Redwood Trust,
Inc.

ITEM 3 SOURCE AND AMOUNT OF FUNDS OR OTHER CONSIDERATIONS

     The first sentence of Item 3 is amended to read as follows:

     "The securities of Redwood Trust, Inc. were purchased at an aggregate cost
     of $28,354,600 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")."

ITEM 5 INTEREST IN SECURITIES OF THE ISSUER

     The answer to Item 5 is amended to read as follows:

     a.   Aggregate number of shares beneficially owned:

            Zweig-DiMenna Special Opportunities, L.P.           -    13,800
 
            Zweig-DiMenna International Limited                 -    487,500
 
            Zweig-DiMenna Partners, L.P.                        -    21,900
 
            ZDIM Account                                        -    107,600
 
            Gotham Account                                      -    60,700
 
          Percent of class beneficially owned:
 
            Zweig-DiMenna Special Opportunities, L.P.           -    0.1%
 
            Zweig-DiMenna International Limited                 -    3.3%
 
            Zweig-DiMenna Partners, L.P.                        -    0.2%
 
            ZDIM Account                                        -    0.7%
<PAGE>
 
            Gotham Account                                      -   0.4%
 
     b.  Number of shares as to which there is sole power to vote:
 
            Zweig-DiMenna Special Opportunities, L.P.           -   13,800
 
            Zweig-DiMenna International Limited                 -   487,500
 
            Zweig-DiMenna Partners, L.P.                        -   21,900
 
            ZDIM Account                                        -   107,600
 
            Gotham Account                                      -   60,700
 
          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.           -   13,800
 
            Zweig-DiMenna International Limited                 -   487,500
 
            Zweig-DiMenna Partners, L.P.                        -   21,900
 
            ZDIM Account                                        -   107,600
 
            Gotham Account                                      -   60,700
 
          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
<PAGE>
 
            Zweig-DiMenna Partners, L.P.                        -    0
 
            ZDIM Account                                        -    0
 
            Gotham Account                                      -    0

     c.   Since September 12, 1997, the date of our last 13D filing for Redwood
          Trust, Inc., Zweig-DiMenna Special Opportunities, L.P., Zweig-DiMenna
          International Limited, Zweig-DiMenna Partners, L.P., the ZDIM Account
          and the Gotham Account sold 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 SALE

            9/12/97      Sold 28,900 shares at $30.8750 a share

            9/12/97      Sold 9,600 shares at $30.875 a share

            9/15/97      Sold 1,000 shares at $31.8250 a share

            ZWEIG-DIMENNA INTERNATIONAL LIMITED

            DATE         DESCRIPTION OF SALE

            9/15/97      Sold 35,200 shares at $31.8250 a share

            ZWEIG-DIMENNA PARTNERS, L.P.

            DATE         DESCRIPTION OF SALE

            9/12/97      Sold 46,100 shares at $30.8750 a share

            9/12/97      Sold 15,400 shares at $30.875 a share

            9/15/97      Sold 1,600 shares at $31.8250 a share

            ZDIM ACCOUNT

            DATE         DESCRIPTION OF SALE

            9/15/97      Sold 7,800 shares at $31.8250 a share
<PAGE>
 
            GOTHAM ACCOUNT

            DATE         DESCRIPTION OF SALE

            9/15/97      Sold 4,400 shares at $31.8250 a share

     d.   Not Applicable

     e.   The Investors ceased to be the beneficial owner of more than 5% of the
shares of the Company on September 15, 1997.
<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: September 16, 1997

               ZWEIG-DiMENNA SPECIAL OPPORTUNITIES, L.P.

               By:  Zweig-DiMenna Associates LLC,
                    Managing General Partner


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

               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: A Managing Director of  the 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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