MAVERICK TUBE CORPORATION
SC 13D/A, 1999-03-12
STEEL PIPE & TUBES
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<PAGE>   1
                       SECURITIES AND EXCHANGE COMMISSION
                              WASHINGTON, DC 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                               (Amendment No. 6 )*



                            MAVERICK TUBE CORPORATION
- --------------------------------------------------------------------------------
                                (Name of Issuer)


                          COMMON STOCK, $.01 PAR VALUE
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)


                                    57791410
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                             JOSEPH D. LEHRER, ESQ.
     10 SOUTH BROADWAY, SUITE 2000, ST. LOUIS, MISSOURI 63102 (314) 241-9090
- --------------------------------------------------------------------------------
           (Name, Address and Telephone Number of Person Authorized to
                      Receive Notices and Communications)

                                  MARCH 9, 1999
- --------------------------------------------------------------------------------
             (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(e), (f) or (g), check the following
box [ ].

         NOTE. Schedules filed in paper format shall include a signed original
and five copies of the schedule, including all exhibits. See Rule 13d-7(b) 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 the 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>   2


                                                              
CUSIP No.  57791410                       13D                 Page 2 of 5 Pages
         -------------
   -----------------------------------------------------------------------------
   1       Names of Reporting Persons/I.R.S. Identification Nos. of Above 
           Persons (entities only)

           WOODBOURNE PARTNERS, L.P.
   -----------------------------------------------------------------------------
   2       Check the Appropriate Box if a Member of a Group 
           (See Instructions)                                       (a)     [ ]
                                                                    (b)     [ ]
   -----------------------------------------------------------------------------
   3       SEC Use Only

   -----------------------------------------------------------------------------
   4       Source of Funds (See Instructions)

           OO
   -----------------------------------------------------------------------------
   5       Check if Disclosure of Legal Proceedings is Required Pursuant to 
           Items 2(d) or 2(e)                                               [ ]
   -----------------------------------------------------------------------------
   6       Citizenship or Place of Organization

           MISSOURI
   -----------------------------------------------------------------------------
      Number of    7  Sole Voting Power
                      1,250,000, SUBJECT TO THE DISCLAIMER CONTAINED IN ITEM 5.
       Shares     --------------------------------------------------------------
    Beneficially   8  Shared Voting Power
                      90,000, SUBJECT TO THE DISCLAIMER CONTAINED IN ITEM 5.
      Owned by    --------------------------------------------------------------
        Each       9  Sole Dispositive Power
                      1,250,000, SUBJECT TO THE DISCLAIMER CONTAINED IN ITEM 5.
      Reporting   --------------------------------------------------------------
                  10  Shared Dispositive Power
     Person With      90,000, SUBJECT TO THE DISCLAIMER CONTAINED IN ITEM 5.
- --------------------------------------------------------------------------------
   11      Aggregate Amount Beneficially Owned by Each Reporting Person

           1,340,000, SUBJECT TO THE DISCLAIMER CONTAINED IN ITEM 5.
- --------------------------------------------------------------------------------
   12      Check if the Aggregate Amount in Row (11) Excludes 
           Certain Shares (See Instructions)                                [ ]

- --------------------------------------------------------------------------------
   13      Percent of Class Represented by Amount in Row (11)
           8.7%

- --------------------------------------------------------------------------------
   14      Type of Reporting Person (See Instructions)
           PN

- --------------------------------------------------------------------------------



<PAGE>   3

                    
CUSIP No.  57791410                       13D                 Page 3 of 5 Pages
          ------------
                         AMENDMENT NO. 6 TO SCHEDULE 13D

         John D. Weil reported the acquisition of shares of Common Stock, $.01
par value ("Stock") of Maverick Tube Corporation, a Delaware corporation (the
"Issuer"), 16401 Swingley Road, Suite 700, Chesterfield, Missouri 63017 in an
initial filing of this Schedule 13D on February 23, 1994, as amended by
Amendment No. 1 filed March 22, 1995, Amendment No. 2 filed January 13, 1997,
Amendment No. 3 filed May 1, 1997, Amendment No. 4 filed December 23, 1998 and
Amendment No. 5 filed January 8, 1999. As reported in Amendment No. 2 filed
January 13, 1997, all shares of Stock previously reported as beneficially owned
by Mr. Weil, members of his family, family trusts or the partnership controlled
by Mr. Weil were transferred to Woodbourne Partners, L.P. (the "Reporting
Person"). Item 4 and Item 5 are hereby amended as follow by this filing. All
other items are unchanged from the initial filing, as previously amended.


ITEM 4.  Purpose of the Transaction.

         The owners listed in Item 5 purchased the Stock of the Issuer for
general investment purposes. The owners listed in Item 5 may acquire additional
shares of the Stock of the Issuer, based upon their respective investment
decisions. It is not contemplated that any of the acquisitions reported
hereunder or any future acquisitions will result in any change in the present
management of the Issuer.

The owners listed in Item 5 have no present plans or proposals which relate to
or would result in:

         (a)      an extraordinary corporate transaction, such as a merger,
                  reorganization or liquidation, involving the Issuer or any of
                  its subsidiaries;

         (b)      a sale or transfer of a material amount of assets of the
                  Issuer or any of its subsidiaries;

         (c)      any change in the present board of directors or management of
                  the Issuer, including any plans or proposals to change the
                  number or term of directors or fill any existing vacancies on
                  the board;

         (d)      any material change in the present capitalization or dividend
                  policy of the Issuer;

         (e)      any other material change in the Issuer's business or
                  corporate structure;

         (f)      changes in the Issuer's charter, by-laws or instruments
                  corresponding thereto or other actions which may impede the
                  acquisition of control of the Issuer by any person;

         (g)      causing a class of securities of the Issuer to be delisted
                  from a national securities exchange or cease to be quoted in
                  an inter-dealer quotation system of a registered national
                  securities association;

         (h)      a class of equity securities of the Issuer becoming eligible
                  for termination of registration pursuant to Section 12(g)(4)
                  of the Securities Exchange Act; or

         (i)      any action similar to those enumerated above.





<PAGE>   4



CUSIP No.  57791410                       13D                 Page 4 of 5 Pages
         ---------------

ITEM 5.  Interest in Securities of the Issuer.

         (a)      Subject to the disclaimer of beneficial ownership hereinafter
                  set forth, the Reporting Person hereby reports beneficial
                  ownership of 1,340,000 shares of Stock in the manner
                  hereinafter described:

<TABLE>
<CAPTION>
                                                                                Percentage of 
                                              Relationship to       Number       Outstanding  
      Shares Held in Name of                  Reporting Person     of Shares     Securities   
      ----------------------                  ----------------     ---------    ------------- 
<S>                                           <C>                  <C>          <C>
Woodbourne Partners, L.P.                     Reporting Person     1,250,000              8.1%
Forsyth Joint Venture                                1                90,000               .6%
                                                                   ---------    ------------- 
                     TOTAL                                         1,340,000              8.7%
                                                                   =========    ============= 
</TABLE>
                                                                                
     The foregoing percentages assume that the Issuer has 15,437,474 shares of
Stock outstanding.

     All shares held in the name of joint venture are reported as beneficially
owned by the Reporting Person because family members of Mr. Weil (the sole
shareholder and director of the corporate general partner of the Reporting
Person) may seek investment advise or voting advise from such individual.

     AS PROVIDED IN S.E.C. REGULATION ss.240.13d-4, THE REPORTING PERSON HEREBY
DECLARES THAT THIS STATEMENT SHALL NOT BE CONSTRUED AS AN ADMISSION THAT IT IS,
FOR THE PURPOSES OF SECTION 13(d) OR 13(g) OF THE SECURITIES EXCHANGE ACT, THE
BENEFICIAL OWNER OF THE SECURITIES COVERED BY THIS STATEMENT.

     (b)    Subject to the above disclaimer of beneficial ownership, for each
            person named in paragraph (a), the number of shares as to which
            there is sole power to vote or direct the vote, shared power to vote
            or direct the vote, sole power to dispose or direct the disposition,
            or shared power to dispose or direct the disposition, is the same as
            in paragraph (a).

     (c)


<TABLE>
<CAPTION>
                                                          Number          Price               Transaction
         Purchase in the Name of          Date          of Shares       Per Share             Made Through
         -----------------------         -------        ---------       ---------           ---------------
<S>                                      <C>            <C>             <C>                 <C>
Woodbourne Partners, L.P.                2/19/99           10,000       $   5.625           Jefferies & Co.
Woodbourne Partners, L.P.                2/23/99            6,000       $   5.625           Jefferies & Co.
Woodbourne Partners, L.P.                2/24/99            5,000       $   5.625           Jefferies & Co.
Woodbourne Partners, L.P.                2/25/99           10,000       $   5.625           Jefferies & Co.
Woodbourne Partners, L.P.                2/26/99            5,000       $   5.625           Jefferies & Co.
Woodbourne Partners, L.P.                 3/2/99           14,000       $   5.625           Jefferies & Co.
Forsyth Joint Venture                     3/5/99           40,000       $   5.625           Jefferies & Co.
Woodbourne Partners, L.P.                 3/5/99           58,000       $   5.625           Jefferies & Co.
Woodbourne Partners, L.P.                 3/9/99           42,000       $   5.566           Jefferies & Co.
</TABLE>


   (d) Not applicable.

   (e) Not applicable.

- ----------------------------

      1 Joint venture among charitable foundation created by Mr. Weil and
charitable foundations created by certain members of Mr. Weil's family.


<PAGE>   5



CUSIP No.  57791410                       13D                 Page 5 of 5 Pages
         ---------------

     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.

                                            WOODBOURNE PARTNERS, L.P.

                                                by its General Partner, CLAYTON
                                                MANAGEMENT COMPANY


                                                      /s/ John D. Weil
                                                --------------------------------
                                                   John D. Weil, President

                                                March 12, 1999







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