<PAGE>


                       SECURITIES AND EXCHANGE COMMISSION
                               Washington, DC 20549

                                    FORM 10-K/A
                                (Amendment No. 1)

[x] ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
    ACT OF 1934 For The Fiscal Year Ended September 30, 1998
                                       OR

[ ] TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE
    ACT OF 1934

     For the transition period from _____________ to ______________

COMMISSION FILE NUMBER                                                  1-10651

                           MAVERICK TUBE CORPORATION
              (Exact name of Registrant as specified in its charter)
       DELAWARE                                                       43-1455766
(State or Other Jurisdiction of                                 (I.R.S. Employer
Incorporation or Organization)                               Identification No.)

  16401 Swingley Ridge Road, Seventh Floor
  Chesterfield, Missouri                                              63017-4800
(Address of principal executive offices)                              (Zip Code)
                              (314) 733-1600
             (Registrant's telephone number, including area code)

Securities Registered Pursuant to Section 12(b) of the Act:  None

Securities registered pursuant to Section 12(g) of the Act:  
                                        Common Stock, par value $.01 per share
                                        Preferred Share Purchase Rights

Indicate by check mark whether the Registrant (1) has filed all reports required
to be filed  by  Section  13 or 15 (d) of the  Securities  Exchange  Act of 1934
during the preceding 12 months (or for such shorter  period that the  Registrant
was  required  to file such  reports),  and (2) has been  subject to such filing
requirements for the past 90 days. Yes XX No

Indicate by check mark if disclosure of delinquent  filers  pursuant to Item 405
of Regulation  S-K is not contained  herein,  and will not be contained,  to the
best  of  the  Registrant's   knowledge,  in  definitive  proxy  or  information
statements  incorporated  by  reference  in Part  III of this  Form  10-K or any
amendment to this Form 10-K. ( )

   
The  aggregate  market  value of the  15,301,072  shares of Common Stock held by
non-affiliates  of the Registrant as of December 10 was  $85,119,864  based upon
the closing price as reported on the NASDAQ  National Market on that date. As of
December 10, 1998, the Registrant  had 15,437,474  outstanding  shares of Common
Stock.
                     ----------------------------------
    

                     DOCUMENTS INCORPORATED BY REFERENCE

As provided  herein,  portions of the  documents  listed below are  incorporated
herein by reference:

Document                                                        Part - Form 10-K
Annual Report to Stockholders for the Fiscal 
  Year Ended September 30, 1998                               Parts I, II and IV
Proxy Statement for the 1999 Annual Meeting of Stockholders             Part III

                                     PART IV
ITEM 14

EXHIBITS, FINANCIAL STATEMENT SCHEDULES AND REPORTS ON FORM 8-K

a.       1.   Financial Statements
              The following  consolidated  financial statements of Maverick Tube
              Corporation and Subsidiaries, included in the Annual Report of the
              Registrant to its  shareholders  for the year ended  September 30,
              1998, are incorporated herein by reference in Item 8:
                  Report of Independent Auditors.
                  Consolidated Balance Sheets as of September 30, 1998 and 1997.
                  Consolidated Statements of Operations for the years ended
                   September 30, 1998, 1997 and 1996.
                  Consolidated Statements of Stockholders' Equity for the years
                   ended September 30, 1998, 1997 and 1996.
                  Consolidated Statements of Cash Flows for the years ended
                   September 30, 1998, 1997 and 1996.
                  Notes to Consolidated Financial Statements as of
                   September 30, 1998.

         2.   Financial Statement Schedule
               The  following  consolidated  financial  statement  schedule  of 
               Maverick  Tube Corporation  and  Subsidiaries  is included  with 
               the Annual Report on Form 10-K:
                           
               Schedule          II   Valuation and qualifying accounts for the
                                      years ended September 30, 1998, 1997 and 
                                      1996.

              All other  schedules for which provision is made in the applicable
              accounting  regulation of the Securities  and Exchange  Commission
              are  not   required   under  the  related   instructions   or  are
              inapplicable, and therefore have been omitted.

     3. Exhibits:  
             See Exhibit Index. 
             The following is a list of each management contract or compensatory
             plan or  arrangement required to be filed as an exhibit to this 
             Annual  Report on Form 10-K  pursuant to Item 14(c) of this Report:
  
             Maverick Tube  Corporation  Amended and Restated 1990 Stock Option
               Plan 
             Maverick Tube  Corporation  Savings for Retirement  Plan as revised
               on January 1, 1993 
             The Amended Maverick Tube  Corporation  1994 Stock Option Plan 
             The Amended Maverick Tube  Corporation Director Stock Option Plan 
             Form of Deferred Compensation  Agreement with Certain Executive 
               Officers 
             Employment Agreement  with Barry R. Pearl 
             Form of Severance  Agreement  with Executive Officers  

b.  Reports on 8-K:  

   
          Two  Form  8-K's  were  filed   during  the  fourth   quarter  of  the
          Registrant's  fiscal year ended September 30, 1998. The Form 8-K filed
          on July 28,  1998  pertained  to the  adoption  by the  Company of the
          Shareholder  Rights  Plan.  The Form  8-K  filed on  September 3, 1998
          pertained  to  the  acquisition  by the  Company  of  its  cold  drawn
          production facility in Beaver Falls, Pennsylvania.
    
SIGNATURES

Pursuant to the  requirements of Section 13 or 15(d) of the Securities  Exchange
Act of 1934,  the Company has duly caused this report to be signed on its behalf
by the undersigned thereunto duly authorized on December 16, 1998.

                                          Maverick Tube Corporation
                                                 (registrant)


December 16, 1998                           /s/ Gregg M. Eisenberg
                                            ----------------------
                                        Gregg M. Eisenberg, Chairman,  President
                                            and Chief Executive Officer


Pursuant to the requirements of the Securities Exchange Act of 1934, this report
has been  signed  on behalf  of the  Company  by the  following  persons  in the
capacities on the dates indicated.


December 16, 1998                              /s/ Gregg M. Eisenberg
                                                   ----------------------
                                         Gregg M. Eisenberg, Chairman, President
                                        and Chief Executive Officer and Director

December 16, 1998                            /s/ Barry R. Pearl
                                                 ------------------
                                          Barry R. Pearl, Vice President Finance
                                        and Administration (Principal Financial 
                                                and Accounting Officer)


December 16, 1998                            /s/ William E. Macaulay
                                                 -----------------------
                                           William E. Macaulay, Director



December 16, 1998                            /s/ John M. Fox
                                                 ---------------
                                           John M. Fox, Director


December 16, 1998                            /s/ C. Robert Bunch
                                                 -------------------
                                           C. Robert Bunch, Director


December __, 1998                            
                                                 ------------------
                                           C. Adams Moore, Director


December __, 1998                            
                                                 --------------------
                                           David H. Kennedy, Director


December __, 1998                            
                                                 ------------------
                                           Wayne P. Mang, Director

                              EXHIBIT INDEX
EXHIBIT                                                                  PAGE
NUMBER        DESCRIPTION                                                NUMBER 

 3.1  Amended and Restated Certificate of Incorporation of the            N/A
      Registrant, incorporated herein by reference to Exhibit 3.2 to
      the Registrant's Registration  Statement on Form S-1, 
      File No. 33-37363 (the "1991  Registration Statement").

 3.2  Amended and Restated Bylaws of the Registrant as amended, filed
      herewith. <F1>

 4.1  Shareholder Rights Agreement dated as of July 24, 1998 between the  N/A
      Registrant  and Harris Trust and Savings Bank as Rights Agent
      incorporated herein by reference to Exhibit 1 of the Registrant's
      Form 8-A filed on August 5, 1998.

 4.2  Form of Stock Certificate for Common Stock, incorporated herein by  N/A
      reference to Exhibit 4.1 to the 1991 Registration Statement.

10.1  Lease and Agreement dated July 24, 1992, by and between the         N/A  
      Registrant and  the  Arkansas   Development   Finance  Authority
      (the   "Authority"), incorporated herein by reference to 
      Exhibit 10.7 to the Registrant's Annual Report on Form 10-K for
      the fiscal year ended September 30, 1992.

   
10.2  Maverick Tube  Corporation  Amended and Restated 1990 Stock Option  N/A 
      Plan, incorporated herein by reference to Exhibit 10.21 to the
      Registrant's Annual Report on Form 10-K for the fiscal year ended 
      September 30, 1991.

10.3  Maverick Tube Corporation Savings for Retirement Plan effective on  N/A
      February 15, 1988, as amended, incorporated herein by reference
      to Exhibit 10.11 to the Registrant's Annual Report on Form 10-K
      for the fiscal year ended September 30, 1993.

10.4  Lease Agreement dated as of March 1, 1994, between the Authority,   N/A
      as lessor, and the Registrant as lessee, related to the
      Registrant's Arkansas Structural Facility, incorporated herein by
      reference to Exhibit 10.14 to the Registrant's Registration Statement
      on Form S-2, File No 33-80096.

10.5  First Supplemental Trust Indenture to Lease Agreement  between the  N/A
      Authority, as lessor and the Registrant, as lessee relating to the
      Registrant's Arkansas Structural Facility dated July 1, 1994, 
      incorporated herein by reference to Exhibit 10.1 to the Registant's
      Quarterly Report on Form 10-Q for the period ended June 30, 1994.

10.6  Supplement to the Second Term Loan  Agreement  dated  December 15,  N/A 
      1994, incorporated herein by reference to Exhibit 10.16 of the
      Registrant's Annual Report on Form 10-K for the fiscal year
      ended September 30, 1994 (the "1994 Form 10-K").
    
10.7  The Maverick Tube Corporation 1994 Stock Option Plan, incorporated  N/A 
      herein by reference to Exhibit 10.17 of the 1994 Form 10-K.

10.8  The Maverick Tube Corporation Director Stock Option Plan,           N/A 
      incorporated herein by reference to Exhibit 10.18 of the 1994 
      Form 10-K.

10.9  Form of Deferred Compensation Agreement between the Registrant and  N/A
      Messrs. Gregg M. Eisenberg, T. Scott Evans and Sudhakar Kanthamneni
      Dated October 1, 1995, incorporated herein by reference to 
      Exhibit 10.22 of the Registrant's Annual Report on Form 10-K for 
      the fiscal year ended September 30, 1996 (the "1996 Form 10-K").

10.10 Amendment #1 to The Maverick Tube Corporation's Director Stock      N/A 
      Option Plan, incorporated herein by reference to Exhibit 10.24 of 
      the 1996 Form 10-K.

10.11 Amendment #1 to The Maverick Tube Corporation's 1994 Stock Option   N/A
      Plan, incorporated herein by reference to Exhibit 10.21 of the 
      Registrant's Annual Report on Form 10-K for the fiscal year 
      ended September 30, 1997.

10.12 Employment Agreement of Barry R. Pearl, incorporated herein by      N/A
      reference to Exhibit 10 of the Registrant's Quarterly Report on 
      Form 10-Q for the period ended June 30, 1998.

10.13 Agreement of Limited Partnership between the Registrant, Maverick
      Investment Corporation and Maverick Tube L.P., filed herewith. <F1>

10.14 Secured Credit Agreement ("Secured Credit Agreement") dated 
      September 18, 1998, by and among the Registrant, Harris Trust 
      and Savings Bank ("Harris Trust") and Mercantile Bank of St. Louis,
      N.A. ("Mercantile Bank"), filed herewith. <F1>

10.15 Note  Receivable dated December 10, 1998, by and among  the
      Registrant, and Barry R. Pearl, Chief Financial Officer, filed
      herewith. <F1>

10.16 Form of Severance Agreement dated December 10, 1998, by and 
      among the Registrant and Gregg M. Eisenberg, Barry R. Pearl, 
      Sudhakar Kanthamneni and T. Scott Evans, filed herewith. <F1>

10.17 First  Amendment to Secured Credit Agreement dated as of 
      December 10, 1998, filed herewith. <F1>

13    Portions of Registrant's 1998 Annual Report to Shareholders, 
      which are incorporated by reference herein.<F1>

21    Subsidiaries of the Registrant. <F1>

23.1  Consent of Ernst & Young LLP, independent auditors. <F1>

27.1  Financial Data Schedule. <F1>

99.1  Risk Factors. <F1>

<F1> Previously filed on Maverick's Annual Report on Form 10-K for the fiscal 
     year ended September 30, 1998.