COSTILLA ENERGY INC
SC 13D/A, 1999-06-10
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1
                                  UNITED STATES
                       SECURITIES AND EXCHANGE COMMISSION
                             Washington, D.C. 20549

                                  SCHEDULE 13D

                    Under the Securities Exchange Act of 1934
                                (AMENDMENT NO. 5)


                              COSTILLA ENERGY, INC.
                                (Name of Issuer)

                          COMMON STOCK, $.10 PAR VALUE
                         (Title of Class of Securities)

                                    22161G103
                                 (CUSIP Number)


                                CADELL S. LIEDTKE
                          400 WEST ILLINOIS, SUITE 1000
                              MIDLAND, TEXAS 79701
                                 (915) 683-3092
           (Name, Address and Telephone Number of Person Authorized to
                       Receive Notices and Communications)

                                  MAY 31, 1999
             (Date of Event Which Requires Filing of this Statement)

If the filing person has previously filed a statement on Schedule 13G to report
the acquisition which is the subject of this Schedule 13D, and is filing this
schedule because of Rule 13d-1(b)(3) or (4), check the following box _____.

Check the following box if a fee is being paid with the statement . (A fee is
not required only if the reporting person:(1) has a previous statement on file
reporting beneficial ownership of more than five percent of the class of
securities described in Item 1; and (2) has filed no amendment subsequent
thereto reporting beneficial ownership of five percent or less of such class.)
(See Rule 13d-7).

NOTE: Six copies of this statement, including all exhibits, should be filed with
the Commission. See Rule 13d-1(a) for other parties to whom copies are to be
sent.

*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
disclosures provided in a prior cover page.

The information required on 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>   2
                                  SCHEDULE 13D

CUSIP NO. 22161G103                                           PAGE 2 OF 7 PAGES

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

1   NAME OF REPORTING PERSON
    S.S. OR I.R.S. IDENTIFICATION NO. OF ABOVE PERSON

    Cadell S. Liedtke
- --------------------------------------------------------------------------------
2   CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                                        (a) [ ]
                                                                        (b) [ ]
- --------------------------------------------------------------------------------
3   SEC USE ONLY


- --------------------------------------------------------------------------------
4   SOURCE OF FUNDS*


- --------------------------------------------------------------------------------
5   CHECK BOX IF DISCLOSURE OF LEGAL PROCEEDINGS IS REQUIRED PURSUANT
    TO ITEMS 2(d) OR 2(e)                                                   [ ]

- --------------------------------------------------------------------------------
6   CITIZENSHIP OR PLACE OF ORGANIZATION


    Texas
- --------------------------------------------------------------------------------
                7   SOLE VOTING POWER
  NUMBER OF
   SHARES           2,510,460
BENEFICIALLY   -----------------------------------------------------------------
  OWNED BY      8   SHARED VOTING POWER
   EACH
 REPORTING          60,000
  PERSON       -----------------------------------------------------------------
   WITH         9   SOLE DISPOSITIVE POWER

                    2,510,460
               -----------------------------------------------------------------
               10   SHARED DISPOSITIVE POWER

                    60,000
- --------------------------------------------------------------------------------
11   AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

     2,570,460
- --------------------------------------------------------------------------------
12   CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (11) EXCLUDES
     CERTAIN SHARES*                                                        [ ]

- --------------------------------------------------------------------------------
13   PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (11)

     18.2%
- --------------------------------------------------------------------------------
14   TYPE OF REPORTING PERSON*

     IN
- --------------------------------------------------------------------------------
                     *SEE INSTRUCTIONS BEFORE FILLING OUT!
         INCLUDE BOTH SIDES OF THE COVER PAGE, RESPONSES TO ITEMS 1-7
     (INCLUDING EXHIBITS) OF THE SCHEDULE, AND THE SIGNATURE ATTESTATION.

<PAGE>   3



         This Amendment No. 5 to Schedule 13D (this "Amendment") is being filed
by Cadell S. Liedtke (the "Reporting Person") to reflect a change in the
beneficial ownership of the Reporting Person of the Common Stock, $0.10 par
value (the "Common Stock"), of Costilla Energy, Inc. (the "Company") from such
beneficial ownership reflected in the Schedule 13D filed by the Reporting Person
on October 18, 1996, as amended by Amendment No. 1 to Schedule 13D filed by the
Reporting Person on November 15, 1996, by Amendment No. 2 to Schedule 13D filed
by the Reporting Person on November 3, 1998, by Amendment No. 3 ("Amendment No.
3") to Schedule 13D filed by the Reporting Person on January 8, 1999, and by
Amendment No. 4 to Schedule 13D filed by the Reporting Person on May 19, 1999
("Amendment No. 4") (collectively, the "Original 13D").

         The changes in the percentage of beneficial ownership reported herein
are the result of shares beneficially owned by the Reporting Person which have
been involuntarily sold pursuant to financing arrangements since Amendment No. 4
(see Item 5 hereof).

         The Reporting Person previously made joint filings of the Original 13D
with Mr. Michael J. Grella ("Grella") and Mr. Henry G. Musselman ("Musselman")
for convenience of factual references. While the Reporting Person had
relationships with Grella and Musselman described in the Original 13D partially
because of their participation in executive management of the Company, the
existence of a "group" was never affirmed. The Reporting Person expressly
disclaims the existence of a "group" with respect to his ownership of Common
Stock, whether with Grella or Musselman or any other party.

         Only those items of Schedule 13D, or portions thereof, being amended
are included in this Amendment. Except as expressly amended and modified by this
Amendment, the Original 13D remains unchanged and in full force and effect.

ITEM 5. INTEREST IN SECURITIES OF ISSUER

         (a) As of May 31, 1999, the Reporting Person beneficially owned
2,570,460 shares of Common Stock constituting 18.2% of the total issued and
outstanding shares of Common Stock (14,101,580 shares).

         (b) The Reporting Person has the sole power to vote or to direct the
vote and the sole power to dispose or direct the disposition of all of the
shares of Common Stock attributed to the Reporting Person in paragraph (a) of
this Item 5, except for 60,000 shares held by the Liedtke Foundation (as
hereinafter defined). The Reporting Person is a director of the Liedtke
Foundation and shares voting and dispositive power over the shares of Common
Stock owned by the Liedtke Foundation with the other directors of the Liedtke
Foundation.

         (c) The Reporting Person financed certain purchases of shares of Common
Stock under a brokerage account arrangement that the Reporting Person has with
Prudential Securities Incorporated ("Prudential") pursuant to a Command Account
Margin Agreement (the "Account


                                   page 3 of 7

<PAGE>   4


Agreement"). The Marion and Cadell S. Liedtke Family Charitable Foundation (the
"Liedtke Foundation"), through which the Reporting Person beneficially owns
shares, has also entered into an Account Agreement with Prudential. The form of
Account Agreement entered into between Prudential and the Reporting Person and
the Liedtke Foundation is substantially similar in all material respects (other
than the name of the accountholder, the date of execution, and other details),
and a copy of the form of the Account Agreement was attached as an exhibit to
Amendment No. 2 and is incorporated herein by reference for a description of the
terms of the financing arrangements pursuant to which the Reporting Person has
borrowed funds for the purchases of Common Stock. To further secure borrowings
under the Account Agreement of the Reporting Person, the Reporting Person has
entered into a Pledge Agreement with Prudential whereby the Reporting Person has
pledged certain of the shares of Common Stock owned by the Reporting Person. A
copy of the form of Pledge Agreement was attached as an exhibit to Amendment No.
2 and is incorporated herein by reference for a description of the terms of the
pledge of shares of Common Stock by the Reporting Person, which include the
right to sell shares under certain circumstances.

                  The Reporting Person has effected the following transactions
in shares of Common Stock during the sixty (60) days prior to the signature date
hereof, each of which is an involuntary sale transaction effected by Prudential
pursuant to the financing arrangements described above. Each of these sales was
transacted through a broker on the public market.


<TABLE>
<CAPTION>
Name           Transaction        Date       Number of Shares      Price per Share
- ----           -----------        ----       ----------------      ---------------
<S>            <C>              <C>          <C>                   <C>
Liedtke        Sale             04/16/99           1,850                 1.191
Liedtke        Sale             04/16/99             500                 1.198
Liedtke        Sale             04/16/99             150                 1.222
Liedtke        Sale             04/16/99           1,300                1 5/16
Liedtke        Sale             04/16/99             700                 1.314
Liedtke        Sale             04/16/99             500                 1.317
Liedtke        Sale             04/19/99           2,500                 .953
Liedtke        Sale             04/20/99           6,000                 .5156
Liedtke        Sale             04/21/99          15,000                 .476
Liedtke        Sale             04/22/99          15,000                 .476
Liedtke        Sale             04/23/99           5,000                 .477
Liedtke        Sale             04/26/99           2,500                 .478
Liedtke        Sale             04/27/99           6,000                 .4613
Liedtke        Sale             04/28/99          25,000                 .4457
Liedtke        Sale             04/30/99          12,500                 .4457
Liedtke        Sale             05/03/99           5,000                 15/32
Liedtke        Sale             05/05/99           2,500                 .4155
Liedtke        Sale             05/06/99          25,000                  .43
</TABLE>


                                   page 4 of 7

<PAGE>   5



<TABLE>
<S>            <C>             <C>          <C>               <C>
Liedtke        Sale            05/07/99        2,500          .353
Liedtke        Sale            05/10/99        5,000          .3872
Liedtke        Sale            05/11/99        7,500          .2985
Liedtke        Sale            05/12/99        5,000          .358
Liedtke        Sale            05/14/99        6,000          .358
Liedtke        Sale            05/17/99        6,000          .3277
Liedtke        Sale            05/18/99       10,000          .2042
Liedtke        Sale            05/19/99       25,000          .2087
Liedtke        Sale            05/20/99       10,000          .3882
Liedtke        Sale            05/20/99       15,000          .3423
Liedtke        Sale            05/20/99        8,000          .357
Liedtke        Sale            05/21/99        5,000          .477
Liedtke        Sale            05/21/99       10,000          .6292
Liedtke        Sale            05/21/99       20,000          .473
Liedtke        Sale            05/27/99        3,000          .358
Liedtke        Sale            05/27/99        7,000          .3455
Liedtke        Sale            05/28/99       28,600          .3016
</TABLE>

         (d)      None.

         (e)      Not applicable.

ITEM 6. CONTRACTS, ARRANGEMENTS, UNDERSTANDINGS OR RELATIONSHIPS WITH RESPECT TO
        SECURITIES OF THE ISSUER

         See Item 5 for a description of the contracts and arrangements of the
Reporting Person with Prudential and with the Liedtke Foundation.

ITEM 7. MATERIAL TO BE FILED AS EXHIBITS.

       *7.1   Form of Command Account Margin Agreement with Prudential
              Securities Incorporated (filed as Exhibit 7.1 to the Amendment No.
              2).

       **7.2  Command Account Margin Agreements between Cadell S. Liedtke and
              Prudential Securities Incorporated dated November 6, 1996 and
              April 10, 1997 (substantially similar in all material respects to
              Exhibit 7.1 other than the name of the accountholder and the date
              of the Agreement).

       **7.5  Command Account Margin Agreement between Marion and Cadell S.
              Liedtke Family Charitable Foundation and Prudential Securities
              Incorporated dated


                                   page 5 of 7

<PAGE>   6



              August 13, 1997 (substantially similar in all material respects to
              Exhibit 7.1 other than the name of the accountholder and the date
              of the Agreement).

       *7.8   Form of Pledge Agreement between the Reporting Person and
              Prudential Securities Incorporated (filed as Exhibit 7.8 to the
              Amendment No. 2).

       **7.9  Pledge Agreement between Cadell S. Liedtke and Prudential
              Securities Incorporated dated March 24, 1998, pledging 2,227,560
              shares of Common Stock (substantially similar in all material
              respects to Exhibit 7.8 other than the name of the pledgor, the
              date of the Agreement and the number of shares being pledged).

- -----------------------
  *Previously filed as indicated.
**Not filed.



                                   page 6 of 7

<PAGE>   7



SIGNATURE

       After reasonable inquiry and to the best knowledge and belief of the
undersigned, the undersigned certifies that the information set forth in this
statement is true, complete and correct.


     May 31, 1999                      /s/ CADELL S. LIEDTKE
- --------------------------             -----------------------------------------
          Date                         Cadell S. Liedtke




                                   page 7 of 7

<PAGE>   8


                                  EXHIBIT INDEX


<TABLE>
<CAPTION>
   EXHIBIT NO.      DESCRIPTION
   -----------      -----------
   <S>              <C>
       *7.1         Form of Command Account Margin Agreement with Prudential
                    Securities Incorporated (filed as Exhibit 7.1 to the Amendment No.
                    2).

       **7.2        Command Account Margin Agreements between Cadell S. Liedtke and
                    Prudential Securities Incorporated dated November 6, 1996 and
                    April 10, 1997 (substantially similar in all material respects to
                    Exhibit 7.1 other than the name of the accountholder and the date
                    of the Agreement).

       **7.5        Command Account Margin Agreement between Marion and Cadell S.
                    Liedtke Family Charitable Foundation and Prudential Securities
                    Incorporated dated August 13, 1997 (substantially similar in all
                    material respects to Exhibit 7.1 other than the name of the
                    accountholder and the date of the Agreement).

       *7.8         Form of Pledge Agreement between the Reporting Person and
                    Prudential Securities Incorporated (filed as Exhibit 7.8 to the
                    Amendment No. 2).

       **7.9        Pledge Agreement between Cadell S. Liedtke and Prudential
                    Securities Incorporated dated March 24, 1998, pledging 2,227,560
                    shares of Common Stock (substantially similar in all material
                    respects to Exhibit 7.8 other than the name of the pledgor, the
                    date of the Agreement and the number of shares being pledged).
</TABLE>

- -----------------------
  *Previously filed as indicated.
**Not filed.


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