UROCOR INC
SC 13G, 1999-02-05
MEDICAL LABORATORIES
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<PAGE>

                              UNITED STATES
                    SECURITIES AND EXCHANGE COMMISSION
                          Washington, D.C. 20549

                                SCHEDULE 13G

                  Under the Securities Exchange Act of 1934
                              (Amendment No. 1)*


                                UROCOR, INC.
- --------------------------------------------------------------------------------
                              (Name of Issuer)


                                Common Stock
- --------------------------------------------------------------------------------
                        (Title of Class of Securities)


                                 91727P105
                      ----------------------------------
                               (CUSIP Number)

                                  5/11/98
- --------------------------------------------------------------------------------
               (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)

     / / Rule 13d-1(c)

     /X/ 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).

<PAGE>

CUSIP No.  91727P105
           ---------

- -------------------------------------------------------------------------------
 (1) Names of Reporting Persons.
     I.R.S. Identification Nos. of above persons (entities only).

     Kummell Investments Ltd.
- -------------------------------------------------------------------------------
 (2) Check the Appropriate Box if a Member   (a)  / /
     of a Group (See Instructions)           (b)  / /  Not Applicable
- -------------------------------------------------------------------------------
 (3) SEC Use Only

- -------------------------------------------------------------------------------
 (4) Citizenship or Place of Organization
     British Virgin Islands
- -------------------------------------------------------------------------------
 Number of Shares             (5) Sole Voting Power
 Beneficially                     0 shares
 Owned by                    --------------------------------------------------
 Each Reporting               (6) Shared Voting Power
 Person With:                     305,698 shares
                             --------------------------------------------------
                              (7) Sole Dispositive Power
                                  0 shares
                             --------------------------------------------------
                              (8) Shared Dispositive Power
                                  305,698 shares
- -------------------------------------------------------------------------------
 (9) Aggregate Amount Beneficially Owned by Each Reporting Person
     305,698
- -------------------------------------------------------------------------------
(10) Check if the Aggregate Amount in Row (9) Excludes Certain Shares (See
     Instructions)        / /  Not Applicable
- -------------------------------------------------------------------------------
(11) Percent of Class Represented by Amount in Row (9)
     2.92%
- -------------------------------------------------------------------------------
(12) Type of Reporting Person (See Instructions)
     CO
- -------------------------------------------------------------------------------

<PAGE>

ITEM 1.

    (a)   Name of Issuer

          UROCOR, INC.
          ---------------------------------------------------------------------
    (b)   Address of Issuer's Principal Executive Offices
          800 Research Parkway, Oklahoma City, Oklahoma 73104
          ---------------------------------------------------------------------


ITEM 2.

    (a)   Name of Person Filing
          Kummell Investments Ltd.
          ---------------------------------------------------------------------
    (b)   Address of Principal Business Office or, if none, Residence
          Suite 922C Europort, Gibraltar
          ---------------------------------------------------------------------
    (c)   Citizenship
          British Virgin Islands
          ---------------------------------------------------------------------
    (d)   Title of Class of Securities
          Common Stock
          ---------------------------------------------------------------------
    (e)   CUSIP Number
          91727P105
          ---------------------------------------------------------------------

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 accordance with
            section 240.13d-1(b)(1)(ii)(F).

    (g) / / A parent holding company or control person in accordance with
            section 240.13d-1(b)(1)(ii)(G).

    (h) / / A savings association 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).

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


<PAGE>

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:
        305,698 shares
    ---------------------------------------------------------------------------

    (b) Percent of class:
        2.92%
    ---------------------------------------------------------------------------

    (c) Number of shares as to which the person has:

          (i) Sole power to vote or to direct the vote
              0 shares
              -----------------------------------------------------------------
         (ii) Shared power to vote or to direct the vote
              305,698 shares
              -----------------------------------------------------------------
        (iii) Sole power to dispose or to direct the disposition of
              0 shares
              -----------------------------------------------------------------
         (iv) Shared power to dispose or to direct the disposition of
              305,698 shares
              -----------------------------------------------------------------


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

    If this statement is being filed to report the fact that as of the date
hereof the reporting person has ceased to be the beneficial owner of more than
five percent of the class of securities, check the following.  /X/


ITEM 6.  OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON
         Not Applicable


ITEM 7.  IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED
         THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY
         Not Applicable


ITEM 8.  IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP
         Not Applicable


ITEM 9.  NOTICE OF DISSOLUTION OF GROUP
         Not Applicable


<PAGE>

ITEM 10. CERTIFICATION

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

               By signing below I certify that, to the best of my knowledge and
               belief, the securities referred to above were acquired and are
               held in the ordinary course of business and 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.

    (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.

         January 23, 1999                               January 23, 1999
- ---------------------------------              ---------------------------------
               Date                                           Date

         /s/ Ho Tuen Yee                           /s/ Louise Mary Garbarino
- ---------------------------------              ---------------------------------
            Signature                                      Signature

            Director                                    Joint Secretary
- ---------------------------------              ---------------------------------
           Name/Title                                      Name/Title


<PAGE>

ITEM 2. IDENTITY AND BACKGROUND

    This statement is filed by the following person (the Reporting Person):

          Kummell Investments Limited (a British Virgin Islands corporation 
engaged in the business of investing in securities, 100% of the outstanding 
capital stock of which is owned by Olive Holdings Limited), with its 
principal place of business at Suite 922C, Europort, Gibraltar.

          Olive Holdings Limited (a British Virgin Islands corporation with 
its principal place of business at Suite 922C, Europort, Gibraltar) is a 
holding company for various wholly owned subsidiaries which are engaged in 
the business of holding various investments. All of the outstanding capital 
stock of Olive Holdings Limited is owned by The OHL Trust.

          The OHL Trust is an Isle of Man trust. The principal business of 
The OHL trust is to own assets for the benefit of Mrs. Chan Tan Ching Fen and 
members of her family. The sole trustee of The OHL Trust is Echo Limited (an 
Isle of Man corporation) with its principal registered address at 3337 Athol 
Street, Douglas, Isle of Man. The principal business of Echo Limited is to act 
as trustee of The OHL Trust. The ultimate beneficial owner of The OHL Trust 
is Mrs. Chan Tan Ching Fen.

          Because Mrs. Chan has the authority to remove Echo Limited as 
trustee and to designate a successor trustee of The OHL Trust, Mrs. Chan may 
be considered to be ultimately in control of The OHL Trust and, through The 
OHL Trust of Olive Holdings Limited and Kummell Investments Limited.




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