CT HOLDINGS INC
SC 13G/A, 2000-03-02
PREPACKAGED SOFTWARE
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<PAGE>   1
                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                 SCHEDULE 13G/A

                    UNDER THE SECURITIES EXCHANGE ACT OF 1934
                               (AMENDMENT NO. 3)*


                               CT HOLDINGS, INC.
                      (formerly Citadel Technology, Inc.)
                       ----------------------------------
                                (Name of Issuer)

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

                                   126 43Y 103
                       ----------------------------------
                                 (CUSIP Number)

                                 March 1, 2000
             -------------------------------------------------------
             (Date of Event Which Requires Filing of this Statement)

     Check the appropriate box to designate the rule pursuant to which this
Schedule is filed:

/ / Rule 13d-1(b)

/X/ Rule 13d-1(c)

/ / Rule 13d-1(d)

*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).





POTENTIAL PERSONS WHO ARE TO RESPOND TO THE COLLECTION OF INFORMATION CONTAINED
IN THIS FORM ARE NOT REQUIRED TO RESPOND UNLESS THE FORM DISPLAYS A CURRENTLY
VALID OMB CONTROL NUMBER.

                                Page 1 of 5 pages

<PAGE>   2

CUSIP No. 126 43Y 103
          -----------
- --------------------------------------------------------------------------------
 1.  Names of Reporting Persons.    THOMAS E. OXLEY
     I.R.S. Identification Nos. of above persons (entities only).   ###-##-####
- --------------------------------------------------------------------------------
 2.  Check the Appropriate Box if a Member of a Group (See Instructions)
     (a)
         ----------------------------------------------------------------------
     (b)
         ----------------------------------------------------------------------
- --------------------------------------------------------------------------------
 3.  SEC Use Only

- --------------------------------------------------------------------------------
 4.  Citizenship or Place of Organization      UNITED STATES
- --------------------------------------------------------------------------------
Number of Shares              5.  Sole Voting Power        3,000,000
 Beneficially                --------------------------------------------------
 Owned by                     6.  Shared Voting Power           0
 Each Reporting              --------------------------------------------------
 Person With                  7.  Sole Dispositive Power   3,000,000
                             --------------------------------------------------
                              8.  Shared Dispositive Power      0
- -------------------------------------------------------------------------------
 9.  Aggregate Amount Beneficially Owned by Each Reporting Person   3,000,000
                                                                  -------------
10.  Check if the Aggregate Amount in Row (9) Excludes Certain Shares
     (See Instructions)
                         ------------------------------------------------------
11.  Percent of Class Represented by Amount in Row (9)          6.7%
                                                         -----------------------
- --------------------------------------------------------------------------------
12.  Type of Reporting Person (See Instructions)
- --------------------------------------------------------------------------------
                     IN
- --------------------------------------------------------------------------------

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

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

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

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

                                Page 2 of 5 pages

<PAGE>   3

ITEM 1.

      (a)  Name of Issuer    CT HOLDINGS, INC.

      (b)  Address of Issuer's Principal Executive Office
           3811 TURTLE CREEK BLVD., SUITE 770
           DALLAS, TEXAS 75219

ITEM 2.

      (a)  Name of Person Filing    THOMAS E. OXLEY

      (b)  Address of Principal Business Office or, if none, Residence
           2727 SOUTH OCEAN BLVD., APT. 803
           HIGHLAND BEACH, FL 33487

      (c)  Citizenship    USA

      (d)  Title of Class of Securities    COMMON STOCK, PAR VALUE $.01
                                           PER SHARE

      (e)  CUSIP Number    126 43Y 103

ITEM 3.  IF THIS STATEMENT IS FILED PURSUANT TO Sections 240.13d-1(b) OR
         240.13d-2(b) or (c), CHECK WHETHER THE PERSON FILING IS A:

      (a) / /  Broker or dealer registered under section 15 of the Act
               (15 U.S.C. 78o).

      (b) / /  Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c).

      (c) / /  Insurance company as defined in section 3(a)(19) of the Act
               (15 U.S.C. 78c).

      (d) / /  Investment company registered under section 8 of the Investment
               Company Act of 1940 (15 U.S.C. 80a-8).

      (e) / /  An investment adviser in accordance with Section
               240.13d-1(b)(1)(ii)(E);

      (f) / /  An employee benefit plan, or endowment fund in accordnace with
               section 240.13d-1(b)(1)(ii)(F);

      (g) / /  A parent holding company in accordnace with Section
               240.13d-1(b)(1)(ii)(G);

      (h) / /  A savings associations as defined in Section 3(b) of the
               Federal Deposit Insurance Act (12 U.S.C. 1813);

      (i) / /  A church plan that is excluded from the definition of an
               investment company under section 3(c)(14) of the Investment
               Company Act of 1940 (15 U.S.C. 80a-3);

                                Page 3 of 5 pages

<PAGE>   4

      (j) / /  Group, in accordance with Section 240.13d-1(b)(1)(ii)(J).

ITEM 4.  OWNERSHIP.

    Provide the following information regarding the aggregate number and
percentage of the class of securities of the issuer identified in Item 1.

      (a) Amount beneficially owned:    3,000,000 (including 200,000 shares
          purchased December 15, 1999 and 800,000 shares purchased from February
          25 through March 1, 2000)

      (b) Percent of class:        6.7%
                            ----------------
      (c) Number of shares as to which such person has:

          (i) Sole power to vote or to direct the vote     3,000,000
                                                       ----------------
         (ii) Shared power to vote or to direct the vote
                                                         ----------------
        (iii) Sole power to dispose or to direct the disposition
              of    3,000,000
                 ---------------
         (iv) Shared power to dispose or to direct the disposition
              of
                 ---------------

     INSTRUCTION: For computations regarding securities which represent a right
to acquire an underlying security SEE Section 240.13d-3(d)(1).

ITEM 5.  OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS    N/A

ITEM 6.  OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON    N/A

ITEM 7.  IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED
         THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY    N/A

ITEM 8.  IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP    N/A

ITEM 9.  NOTICE OF DISSOLUTION OF GROUP    N/A

ITEM 10. CERTIFICATION


                                Page 4 of 5 pages
<PAGE>   5

      (b) The following certification shall be included if the statement is
filed pursuant to Section 240.13d-1(c):

            By signing below I certify that, to the best of my knowledge and
            belief, the securities referred to above were not acquired and are
            not held for the purpose of or with the effect of changing or
            influencing the control of the issuer of the securities and were not
            acquired and are not held in connection with or as a participant in
            any transaction having that purpose or effect.


                                    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.


                                                    March 2, 2000
                                       ----------------------------------------
                                                       (Date)

                                                 /s/ Thomas E. Oxley
                                       ----------------------------------------
                                                     (Signature)

                                                   THOMAS E. OXLEY
                                       ----------------------------------------
                                                    (Name/Title)



     ATTENTION: INTENTIONAL MISSTATEMENTS OR OMISSIONS OF FACT CONSTITUTE
FEDERAL CRIMINAL VIOLATIONS (SEE 18 U.S.C. 1001)






                                Page 5 of 5 pages





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