LANDMARK GRAPHICS CORP
POS AM, 1996-10-04
COMPUTER INTEGRATED SYSTEMS DESIGN
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<PAGE>   1
As filed with the Securities and Exchange Commission on October 4, 1996
                                                       Registration No. 33-23957
- --------------------------------------------------------------------------------

                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

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

                         POST-EFFECTIVE AMENDMENT NO. 3
                                     TO
                                  FORM S-1

            REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933

                         LANDMARK GRAPHICS CORPORATION
             (Exact name of registrant as specified in its charter)


      DELAWARE                                           76-0029459
(State of Organization)                     (I.R.S. Employer Identification No.)
                         
                                     3811  
                         (Primary Standard Industrial
                          Classification Code Number)

                 15150 MEMORIAL DRIVE, HOUSTON, TEXAS  77079
                               (713) 560-1000
  (Address and telephone number of principal executive offices)  (zip code)


                           PATTI L. MASSARO, ESQ.
                               GENERAL COUNSEL
                            15150 MEMORIAL DRIVE
                            HOUSTON, TEXAS  77079
                   (Name and address of agent for service)

                               (713) 560-1000
        (Telephone number, including area code, of agent for service)

                                 Copies to:

                         ROBERT E. CRAWFORD, JR., ESQ.
                        WINSTEAD SECHREST & MINICK P.C.
                               1201 ELM STREET
                           5400 RENAISSANCE TOWER
                             DALLAS, TEXAS 75270

                               ---------------
<PAGE>   2
                              EXPLANATORY NOTE

         This Post-Effective Amendment No. 3 to the Registration Statement on
Form S-1 is being filed in order to deregister all securities remaining unsold
under that certain Registration Statement on Form S-1 (Registration No.
33-23957) which was filed on August 22, 1988.

<PAGE>   3
                                 SIGNATURES

         Pursuant to the requirements of the Securities Act of 1933, the
Registrant has duly caused this Post-Effective Amendment No. 3 to Registration
Statement to be signed on its behalf by the undersigned, thereunto duly
authorized, in the City of Houston, State of Texas, on October 4, 1996.

                                 LANDMARK GRAPHICS CORPORATION




                                 By: /s/ Robert P. Peebler       
                                     ------------------------------------------
                                     Robert P. Peebler
                                     President and Chief Executive Officer


<PAGE>   4

         Pursuant to the requirements of the Securities Act of 1933, this
Post-Effective Amendment No. 3 to Registration Statement has been signed by the
following persons in the capacities and on the dates indicated.

 Signature and Title                                    Date
 -------------------                                    ----

 /s/ Robert P. Peebler                              October 4, 1996
 -----------------------------------
 Robert P. Peebler
 Director, President, and Chief
 Executive Officer (Principal
 Executive Officer)


 /s/ William H. Seippel*                            October 4, 1996
 -----------------------------------                
 William H. Seippel
 Vice President, Finance and
 Chief Financial Officer
 (Principal Financial and Accounting
 Officer)


 /s/ Sam K. Smith*                                  October 4, 1996
 -----------------------------------
 Sam K. Smith
 Chairman of the Board


 /s/ Lucio Lanza*                                   October 4, 1996
 -----------------------------------
 Lucio Lanza
 Director


 /s/ James A. Downing, II*                          October 4, 1996
 -----------------------------------
 James A. Downing, II
 Director


 /s/ Charles L. Blackburn*                          October 4, 1996
 -----------------------------------
 Charles L. Blackburn
 Director


 /s/ Theodore Levitt*                               October 4, 1996
 -----------------------------------
 Theodore Levitt
 Director


*By:  Robert P. Peebler, attorney-in-fact.


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