3DX TECHNOLOGIES INC
8-A12G, 1996-12-09
CRUDE PETROLEUM & NATURAL GAS
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                       SECURITIES AND EXCHANGE COMMISSION

                             WASHINGTON, D.C. 20549

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

                                    FORM 8-A


                FOR REGISTRATION OF CERTAIN CLASSES OF SECURITIES
                    PURSUANT TO SECTION 12(b) OR 12(g) OF THE
                         SECURITIES EXCHANGE ACT OF 1934


                              3DX Technologies Inc.

             (EXACT NAME OF REGISTRANT AS SPECIFIED IN ITS CHARTER)


               Delaware                                76-0386601

(STATE OF INCORPORATION OR ORGANIZATION)   (I.R.S. EMPLOYER IDENTIFICATION NO.)


         12012 Wickchester
         Suite 250
         Houston, Texas                                77079

 (ADDRESS OF PRINCIPAL EXECUTIVE OFFICES)                  (ZIP CODE)


   If this Form relates to the                  If this Form relates to the
   registration  of a class of                  registration of a class of
   debt securities and is                       debt securities and is to       
   effective upon filing pursuant               become effective simultaneously
   to General Instruction A(c)(1)               with the effectiveness of a
   please check the following                   concurrent registration
   box.  \  \                                   statement under the Securities
                                                Act of 1933 pursuant to General
                                                Instruction A(c)(2) please
                                                check the following box. \  \
                                      





       SECURITIES TO BE REGISTERED PURSUANT TO SECTION 12(B) OF THE ACT:

TITLE OF EACH CLASS                             NAME OF EACH EXCHANGE ON WHICH
TO BE SO REGISTERED                              EACH CLASS IS TO BE REGISTERED
- -------------------                             -------------------------------

 NOT APPLICABLE                                        NOT APPLICABLE
 --------------                                        --------------


        SECURITIES TO BE REGISTERED PURSUANT TO SECTION 12(G) OF THE ACT:

                     COMMON STOCK, PAR VALUE $0.01 PER SHARE
                     ---------------------------------------
                                (Title of Class)


                                   

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Item 1.  DESCRIPTION OF REGISTRANT'S SECURITIES TO BE REGISTERED.

         The securities to be registered  hereunder are common stock,  par value
$0.01  per  share  (the  "Common   Stock")  of  3DX   Technologies   Inc.   (the
"Registrant").  A description of the Common Stock is set forth under the caption
"Description of Capital Stock" contained in the prospectus forming a part of the
Registrant's  Registration  Statement on Form S-1, as amended (the "Registration
Statement")  (File  No.  333-14473)  initially  filed  with the  Securities  and
Exchange  Commission  on October 18, 1996.  Such  description,  and as it may be
subsequently amended, is incorporated herein by reference.

Item 2.  EXHIBITS.

         The  following  exhibits  are  filed  as a part  of  this  Registration
Statement:


         Exhibit
           NO.           DESCRIPTION
         -------         -----------

           1.            Fourth  Restated  Certificate of  Incorporation  of 
                         the Registrant, incorporated  herein  by  reference
                         to Exhibit  3.1(i)(b)  to the Registration Statement.

           2.            Fifth Restated  Certificate  of  Incorporation of the
                         Registrant, incorporated  herein  by  reference  to
                         Exhibit  3.1(i)(c)  to the Registration Statement.

           3.            Sixth Restated  Certificate  of  Incorporation of the
                         Registrant, incorporated  herein  by  reference  to
                         Exhibit  3.1(i)(d)  to the Registration Statement.

           4.            Amended and Restated Bylaws of the Registrant,
                         incorporated herein by reference to Exhibit 3.1(ii)(a)
                         to the Registration Statement.

           5.            Second Amended and Restated Bylaws of the Registrant,
                         incorporated herein by reference to Exhibit 3.1(ii)(b)
                         to the  Registration Statement.

           6.            Form  of  Specimen  Stock  Certificate,  incorporated
                         herein by reference to Exhibit 4.1 to the Registration
                         Statement.

           7.            Series   C   Preferred   Stock   Purchase   Agreement,
                         incorporated  herein by  reference  to Exhibit 10.3 to
                         the Registration Statement.

           8.            Second Amended and Restated Co-Sale Agreement,
                         incorporated herein by reference to Exhibit 10.4 to
                         the Registration Statement.

           9.            Stock Purchase and Restriction  Agreement, between the
                         Registrant and C. Eugene  Ennis, incorporated  herein
                         by reference to Exhibit 10.5 to the Registration
                         Statement.

           10.           Stock  Purchase and  Restriction  Agreement  between
                         the Registrant and Peter M.  Duncan,  incorporated
                         herein by reference to Exhibit 10.6 to the
                         Registration Statement.

           11.           Stock Purchase and  Restriction  Agreement between the
                         Registrant and Douglas C. Nester, incorporated herein
                         by reference to Exhibit 10.7 to the Registration
                         Statement.




<PAGE>


                                    SIGNATURE

         Pursuant to the  requirements of Section 12 of the Securities  Exchange
Act of 1934, the Registrant  has duly caused this  registration  statement to be
signed on its behalf by the undersigned, thereto duly authorized.


                                            3DX TECHNOLOGIES INC.



Date: December 9, 1996                    By: /S/ C. EUGENE ENNIS
                                                -------------------
                                                C. Eugene Ennis
                                                President and Chief
                                                Executive Officer




<PAGE>


                                INDEX TO EXHIBITS


         Exhibit
           NO.          DESCRIPTION
         -------        -----------

           1.           Fourth  Restated  Certificate of  Incorporation of the
                        Registrant, incorporated  herein  by  reference  to
                        Exhibit  3.1(i)(b)  to the Registration Statement.

           2.           Fifth Restated  Certificate  of  Incorporation  of the
                        Registrant, incorporated  herein  by  reference  to
                        Exhibit  3.1(i)(c)  to the  Registration Statement.

           3.           Sixth Restated  Certificate  of  Incorporation  of the
                        Registrant, incorporated  herein  by  reference  to
                        Exhibit  3.1(i)(d)  to the Registration Statement.

           4.           Amended and Restated Bylaws of the Registrant,
                        incorporated herein by reference to Exhibit 3.1(ii)(a)
                        to the Registration Statement.

           5.           Second Amended and Restated Bylaws of the Registrant,
                        incorporated herein by reference to Exhibit 3.1(ii)(b)
                        to the  Registration Statement.

           6.           Form  of  Specimen  Stock  Certificate,  incorporated
                        herein by reference to Exhibit 4.1 to the Registration
                        Statement.

           7.           Series   C   Preferred   Stock   Purchase   Agreement,
                        incorporated  herein by  reference  to Exhibit 10.3 to
                        the Registration Statement.

           8.           Second Amended and Restated Co-Sale Agreement, 
                        incorporated herein by reference to Exhibit 10.4 to
                        the Registration Statement.

           9.           Stock Purchase and  Restriction  Agreement,  between 
                        the Registrant and C. Eugene  Ennis,  incorporated 
                        herein by reference to Exhibit 10.5 to the Registration
                        Statement.

           10.          Stock  Purchase and  Restriction Agreement  between the
                        Registrant and Peter M.  Duncan,  incorporated  herein
                        by reference to Exhibit 10.6 to the Registration
                        Statement.

           11.          Stock  Purchase and Restriction  Agreement  between the
                        Registrant and Douglas C. Nester,  incorporated herein
                        by reference to Exhibit 10.7 to the Registration
                        Statement.






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