CARRIZO OIL & GAS INC
SC 13D/A, 2000-01-06
CRUDE PETROLEUM & NATURAL GAS
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<PAGE>   1

                       SECURITIES AND EXCHANGE COMMISSION
                             WASHINGTON, D.C. 20549

                                  SCHEDULE 13D

                                (AMENDMENT NO. 1)

                   Under the Securities Exchange Act of 1934*

                             Carrizo Oil & Gas, Inc.
- --------------------------------------------------------------------------------
                                (Name of Issuer)

                     Common Stock, par value $.01 per share
- --------------------------------------------------------------------------------
                         (Title of Class of Securities)

                                   144577 10 3
- --------------------------------------------------------------------------------
                                 (CUSIP Number)

                                 Frank A. Wojtek
                             Carrizo Oil & Gas, Inc.
                        14811 St. Mary's Lane, Suite 148
                              Houston, Texas 77079
                                 (281) 496-1352
- --------------------------------------------------------------------------------
            (Name, Address and Telephone Number of Person Authorized
                     to Receive Notices and Communications)

                                December 15, 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 that is the subject of this Schedule 13D, and is filing this
schedule because of Sections 240.13d-1(e), 240.13d-1(f) or 240.13d-1(g), check
the following box [ ].

Note: Schedules filed in paper format shall include a signed original and five
copies of the schedule, including all exhibits. See Rule 13d-7 for other parties
to whom copies are to be sent.

*The remainder of this cover page should 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


CUSIP No. 144577 10 3
- --------------------------------------------------------------------------------
         (1)      Name of Reporting Person
                  S.S. or I.R.S. Identification Nos. of Above Person

                  Frank A. Wojtek

- --------------------------------------------------------------------------------
         (2)      Check the Appropriate Box if a Member of a Group
                                                                    (a) [ ]
                                                                    (b) [X]
- --------------------------------------------------------------------------------
         (3)      SEC Use Only
- --------------------------------------------------------------------------------
         (4)      Source of Funds

                  00
- --------------------------------------------------------------------------------
         (5)      Check if Disclosure of Legal Proceedings is Required Pursuant
                  to Items 2(d) or 2(e)                              [ ]

- --------------------------------------------------------------------------------
         (6)      Citizenship or Place of Organization

                  United States of America
- --------------------------------------------------------------------------------
Number of         (7)      Sole Voting Power
 Shares                         1,303,721 Shares (30,000 of which are issuable
                                upon the exercise of certain options)
                  --------------------------------------------------------------
Beneficially      (8)      Shared Voting Power
Owned by                        0 Shares
Each              --------------------------------------------------------------
                  (9)      Sole Dispositive Power
                                1,303,721 Shares (30,000 of which are issuable
                                upon the exercise of certain options)
                  --------------------------------------------------------------
Reporting         (10)     Shared Dispositive Power
Person with                     0 Shares
- --------------------------------------------------------------------------------
         (11)     Aggregate Amount Beneficially Owned by Each Reporting Person
                           1,303,721 Shares
- --------------------------------------------------------------------------------
         (12)     Check if the Aggregate Amount in Row (11) Excludes Certain
                  Shares                                          [X]
- --------------------------------------------------------------------------------
         (13)     Percent of Class Represented by Amount in Row (11)
                            9.3%
- --------------------------------------------------------------------------------
         (14)     Type of Reporting Person (See Instructions)       IN


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INTRODUCTORY NOTE.


             This Amendment No. 1 to Schedule 13D is being filed on behalf of
Frank A. Wojtek ("Mr. Wojtek") to supplement certain information set forth in
the Schedule 13D relating to securities of Carrizo Oil & Gas, Inc., a Texas
corporation (the "Company"), originally filed by Mr. Wojtek on January 8, 1998
(as so amended, the "Original Statement"), with respect to the Common Stock, par
value $.01 per share (the "Common Stock"), of the Company. Unless otherwise
indicated, each capitalized term used but not defined herein shall have the
meaning assigned to such term in the Original Statement.

ITEM 5. INTEREST IN SECURITIES OF THE ISSUER

             Mr. Wojtek beneficially owns an aggregate of 1,303,721 shares of
Common Stock (approximately 9.3% of the 14,041,364 shares deemed to be
outstanding as of December 15, 1999 (consisting of 14,011,364 shares of Common
Stock and 30,000 options that are exercisable within 60 days, but not including
20,000 other options held by Mr. Wojtek)).

             On December 15, 1999 the Company consummated the transactions (the
"Financing") contemplated by a Securities Purchase Agreement dated December 15,
1999 (the "Securities Purchase Agreement") among the Company, CB Capital
Investors, L.P. ("Chase"), Mellon Ventures, L.P. ("Mellon"), Paul B. Loyd, Jr.,
Douglas A.P. Hamilton and Steven A. Webster (excluding the Company, the
"Investors"). Such transactions included (i) the payment by the Investors of an
aggregate purchase price of $30,000,000, (ii) the sale of an aggregate of
$22,000,000 principal amount of 9% Senior Subordinated Notes due 2007 (the
"Notes") to the Investors, (iii) the sale of an aggregate of 3,636,364 shares of
the Company's Common Stock for $2.20 per share to the Investors, (iv) the sale
of warrants (the "Warrants") to purchase up to 2,760,189 shares of the


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Company's Common Stock (the "Warrant Shares") at the exercise price of $2.20 per
share, subject to adjustments, to the Investors, (v) the execution of the
Shareholders Agreement dated December 15, 1999 (the "Shareholders Agreement")
among the Company, Chase, Mellon, Paul B. Loyd, Jr., Douglas A.P. Hamilton,
Steven A. Webster, S.P. Johnson IV, Frank A. Wojtek and DAPHAM Partnership,
L.P., (vi) the execution and delivery of the Warrant Agreement dated December
15, 1999 (the "Warrant Agreement") among the Company, Chase, Mellon, Paul B.
Loyd, Jr., Douglas A.P. Hamilton and Steven A. Webster, (vii) the execution of
the Registration Rights Agreement dated December 15, 1999 ("Chase Registration
Rights Agreement") among the Company, Chase and Mellon, (viii) the execution of
the Amended and Restated Registration Rights Agreement dated December 15, 1999
("Amended Founders Registration Rights Agreement") among the Company, Paul B.
Loyd, Jr., Douglas A.P. Hamilton, Steven A. Webster, S.P. Johnson IV, Frank A.
Wojtek and DAPHAM Partnership, L.P., and (ix) the execution of a Compliance
Sideletter dated December 15, 1999 among the Company, Chase and Mellon (the
"Compliance Sideletter").

             Also on December 15, 1999 the Company consummated the transactions
(the "Enron Repurchase") contemplated by the Stock and Warrant Purchase
Agreement dated December 1, 1999 ("Enron Purchase Agreement") among the Company
and Enron North America Corp. ("ENA"), Joint Energy Development Investments II
Limited Partnership ("JEDI II") and Sundance Assets, L.P. ("Sundance") (ENA,
JEDI II and Sundance, collectively, the "Enron Parties"). Such transactions
included (i) the payment to the Enron Parties of an aggregate purchase price of
$12,000,000 and other fees, (ii) the repurchase of all the outstanding shares of
the Company's 9% Series A Preferred Stock, (iii) the repurchase of 750,000
currently outstanding warrants to purchase the Company's Common Stock held by
the Enron Parties and (iv) the amendment of the terms of 250,000 warrants


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(the "Retained Enron Warrants") to purchase the Company's Common Stock retained
by the Enron Parties . The exercise price of the Retained Enron Warrants was
reduced from $11.50 per share to $4 per share as contemplated by the Enron
Purchase Agreement.

             The parties to the Shareholders Agreement may be deemed to have
formed a group pursuant to Rule 13d-5(b)(1) promulgated under the Securities
Exchange Act of 1934, as amended (the "Exchange Act"). Nothing herein shall
constitute an affirmance that any such group exists; however, any such group
could be deemed to have beneficial ownership, for purposes of Sections 13(g) and
13(d) of the Exchange Act, of all equity securities of the Company beneficially
owned by such parties. Such parties would, as of December 15, 1999, be deemed to
beneficially own an aggregate of 12,689,556 shares of Common Stock, or
approximately 75.1% of the total number of shares of the Company's Common Stock
deemed to be outstanding as of December 15, 1999. Mr. Wojtek disclaims the
beneficial ownership of any Common Stock owned by such other parties. For a
description of the Shareholders Agreement, see Item 6, Contracts, Arrangements,
Understandings or Relationships with Respect to Securities of the Issuer.

             Mr. Wojtek has sole voting power with respect to the Common Stock
held by him, and the sole power to dispose or direct the disposition of the
Common Stock held by him (subject to the Shareholders Agreement).

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

             Under the Shareholders Agreement each of S.P. Johnson IV, Frank A.
Wojtek, Paul B. Loyd, Jr., Douglas A.P. Hamilton, Steven A. Webster, DAPHAM
Partnership, L.P., Chase and Mellon (the "Shareholders") have agreed not to
transfer shares of the Common Stock or the


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<PAGE>   6


Warrants to a competitor of the Company and have agreed to cause certain
transferees to be bound by the Shareholders Agreement.

             The Shareholders Agreement provides that so long as Chase owns at
least 15% of the Common Stock of the Company (with percentage ownerships being
determined as specified in the Shareholders Agreement), the Shareholders agree
to vote their shares to cause the number of directors constituting the Board of
Directors to be seven and to cause the election of two directors to be nominated
by Chase. The Shareholders have agreed, so long as Chase owns at least 7.5% of
the Common Stock (with percentage ownerships being determined as specified in
the Shareholders Agreement) of the Company but less than 15%, to vote their
shares to cause the number of directors constituting the Board of Directors to
be seven and to cause the election of one director to be nominated by Chase. The
Shareholders have also agreed if at any time after December 15, 2004, Chase then
owns at least 15% of the Common Stock (with percentage ownerships being
determined as specified in the Shareholders Agreement) that, unless there shall
have occurred certain completed or proposed sale transactions involving the
Company or there has occurred a specified minimum public float of Common Stock,
then Chase has the right to designate two additional members to the Board and
the size of the Board shall be increased accordingly. The Shareholders have
agreed to vote their shares in accordance with such arrangement. The Company
may, upon Board approval, increase the size of the Board by one additional
member at any time after its next shareholders meeting. If the Company at any
other time increases the size of the Board of Directors, the Shareholders have
agreed to take action, including the voting of their securities, to cause to be
elected the number of directors nominated by Chase necessary to maintain the
applicable proportion of directors nominated by Chase to the Board of Directors.


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             Pursuant to the Shareholders Agreement, Messrs. Christopher Behrens
and Arnold Chavkin were appointed to the Company's Board of Directors.

             For so long as Chase is entitled to designate a director, at least
one such director is required to be a member of each committee of the Company's
Board of Directors and the board of directors of any subsidiary of the Company.
The Company has, in connection with the Shareholders Agreement, established a
Budget Committee of the Board of Directors that will consider matters relating
to the Company's drilling program, the Company's budget and related matters. In
certain circumstances in which Chase is entitled to name a director and such
directorship is vacant, Chase may instead appoint one or more Board observers in
lieu of directors.

             The Company has agreed to submit for approval by the Company's
shareholders the issuance of the Warrants, the Warrant Shares and the Common
Stock as contemplated by the Securities Purchase Agreement at the Company's next
shareholders' meeting. The Shareholders have agreed to vote their securities to
approve such action.

             The Company agreed in the Shareholders Agreement to limit the
maximum number of common stock equivalents issuable under the Company's equity
incentive plans to 2.5 million shares and equivalents (including any shares and
equivalents issued or issuable as of the date of the Shareholders Agreement).

             The Shareholders have also agreed in the Shareholders Agreement to
cooperate with the Company in complying with the terms of the Compliance
Sideletter (described below), including by voting in favor of actions taken to
remedy certain regulatory problems.

             If S.P. Johnson IV, Frank A. Wojtek, Paul B. Loyd, Jr., Douglas
A.P. Hamilton, Steven A. Webster, DAPHAM Partnership L.P. or certain transferees
thereof (each a "Founder


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<PAGE>   8


Shareholder") desires to make certain transfers of shares of Common Stock that
are not Public Sales (as determined in the Shareholders Agreement), such Founder
Shareholder must allow Mellon and any Shareholder who holds at least 10% of the
Common Stock of the Company and is not a Founder Shareholder (collectively, the
"Significant Shareholders") the option also to include shares in the transfer.
If the prospective transferee is unwilling or unable to acquire all such shares,
then the transferring Founder Shareholder may either cancel the proposed
transfer or allocate on a proportional basis the number of shares the
prospective transferee is willing to acquire among the transferring Founder
Shareholder and the Significant Shareholders.

             Under the Shareholders Agreement, the Company has granted to the
Significant Shareholders rights to purchase certain (i) equity securities, (ii)
debt securities, (iii) options, warrants and other rights to acquire each of
such securities and (iv) common stock equivalents convertible into or
exchangeable for equity securities issuable by the Company, provided that
securities issued pursuant to equity incentive plans, securities issued in
certain public offerings, securities issued as consideration in a merger,
business combination or acquisition, certain securities issued upon conversion
of other securities, the Warrant Shares, and certain distributions of securities
are all excluded from this right.

             The Shareholders Agreement terminates upon the first to occur of
(a) notice of termination by holders of 50% of the shares held by Chase or
Mellon (and certain of their transferees), (b) certain sale transactions
involving the Company or (c) the time neither Chase nor Mellon (or certain of
their transferees) owns more than 7 1/2% of the Common Stock.

             The Chase Registration Rights Agreement provides registration
rights with respect to the shares of Common Stock held by Chase and Mellon as of
December 15, 1999 and any shares


                                      -8-
<PAGE>   9


issuable upon the conversion of certain other securities of the Company (the
"Investor Registrable Securities"). The Company may generally be required to
effect four demand registrations, subject to certain conditions and limitations.
Shareholders owning not less than 51% of the then-outstanding shares of Investor
Registrable Securities may demand that the Company effect a registration under
the Securities Act for the sale of not less than 5% of the shares of Investor
Registrable Securities then outstanding. The holders of the registration rights
also have limited rights to require the Company to include their shares of
Common Stock in connection with other registered offerings by the Company. The
registration rights will terminate as to any holder of Investor Registrable
Securities at such time as such holder may sell under Rule 144 all Investor
Registrable Securities then held by such holder. This agreement requires the
investor parties to this agreement to agree to certain lock-up restrictions in
connection with certain public offerings registered by the Company.

             The Founders Registration Rights Agreement, to which Mr. Wojtek is
a party, was amended to provide that the Company may generally be required to
effect four demand registrations (rather than the previous six), subject to
certain conditions and limitations, and to provide for the integration of such
agreement with the Chase Registration Rights Agreement.

             The Company agreed in a Compliance Sideletter with Chase and Mellon
to, among other things, use commercially reasonable efforts to assist these
shareholders in remedying or preventing certain regulatory problems of such
shareholders that may be asserted by the Small Business Administration, the
Federal Reserve Board, the Controller of Currency or any other governmental
regulatory agency concerned with the regulation of banks or financial services
institutions. These actions include without limitation, assisting in
facilitating certain transfers, and permitting such investors to exchange voting
securities for similar non-voting securities. The


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<PAGE>   10


Company also agreed with Chase and Mellon to comply with certain small business
administration and other regulation and to provide information relating thereto
to such investor.

             Each of the Company's five directors, including Mr. Wojtek, entered
into an amendment to his indemnification agreement that provides that nothing in
the Shareholders Agreement or in the transactions contemplated by the Securities
Purchase Agreement will constitute a "Change of Control" within the meaning of
such term in each such director's indemnification agreement.

             Each of the Company's four executive officers, including Mr.
Wojtek, entered into an amendment to his employment agreement that provides that
nothing in the Shareholders Agreement or in the transactions contemplated by the
Securities Purchase Agreement will constitute a "Change of Control" within the
meaning of such term in each such employee's employment agreement.

             The Company also amended its Amended and Restated Bylaws (the
"Bylaws") to provide that nothing in the Shareholders Agreement or in the
transactions contemplated by the Securities Purchase Agreement will constitute a
"Change of Control" within the meaning of such term in the Bylaws.

             As part of the Enron Repurchase, the shareholders agreement
described in the Original Statement among various Enron Corp. affiliates, the
Company, Mr. Wojtek and certain other shareholders of the Company was
terminated.

             The descriptions of the Securities Purchase Agreement, the
Shareholders Agreement, the Warrant Agreement, the Chase Registration Rights
Agreement, the Amended Founders Registration Rights Agreement, the Compliance
Sideletter, the form of amendment to the


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indemnification agreements, the form of amendment to the employment agreements,
the amendment to the Company's Amended and Restated Bylaws and the Enron
Purchase Agreement do not purport to be complete and are qualified in their
entirety by provisions of each such agreement, copies of which have been filed
as Exhibits 12, 13, 14, 15, 16, 17, 18, 19, 20 and 21, respectively, and which
are incorporated by reference herein.

ITEM 7. MATERIAL TO BE FILED AS EXHIBITS.

         Exhibit 12   Securities Purchase Agreement dated December 15, 1999
                      among the Company, CB Capital Investors, L.P., Mellon
                      Ventures, L.P., Paul B. Loyd, Jr., Douglas A.P. Hamilton
                      and Steven A. Webster (incorporated herein by reference to
                      Exhibit 99.1 to the Company's Form 8-K dated December 15,
                      1999).

         Exhibit 13   Shareholders Agreement dated December 15, 1999 among the
                      Company, CB Capital Investors, L.P., Mellon Ventures,
                      L.P., S.P. Johnson IV, Frank A. Wojtek, Paul B. Loyd, Jr.,
                      Douglas A.P. Hamilton, Steven A. Webster and DAPHAM
                      Partnership, L.P. (incorporated herein by reference to
                      Exhibit 99.2 to the Company's Form 8-K dated December 15,
                      1999).

         Exhibit 14   Warrant Agreement dated December 15, 1999 among the
                      Company, CB Capital Investors, L.P., Mellon Ventures,
                      L.P., Paul B. Loyd, Jr., Douglas A.P. Hamilton and Steven
                      A. Webster (incorporated herein by reference to Exhibit
                      99.3 to the Company's Form 8-K dated December 15, 1999).

         Exhibit 15   Registration Rights Agreement dated December 15, 1999
                      among the Company, CB Capital Investors, L.P. and Mellon
                      Ventures, L.P. (incorporated herein by reference to
                      Exhibit 99.4 to the Company's Form 8-K dated December 15,
                      1999).

         Exhibit 16   Amended and Restated Founders Registration Rights
                      Agreement dated December 15, 1999 among the Company, S.P.
                      Johnson IV, Frank A. Wojtek, Paul B. Loyd, Jr., Douglas
                      A.P. Hamilton, Steven A. Webster and DAPHAM Partnership,
                      L.P. (incorporated herein by reference to Exhibit 99.5 to
                      the Company's Form 8-K dated December 15, 1999).

         Exhibit 17   Compliance Sideletter dated December 15, 1999 among the
                      Company, CB Capital Investors, L.P. and Mellon Ventures,
                      L.P. (incorporated herein


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                      by reference to Exhibit 99.6 to the Company's Form 8-K
                      dated December 15, 1999).

         Exhibit 18   Form of Amendment to Director Indemnification Agreement
                      (incorporated herein by reference to Exhibit 99.8 to the
                      Company's Form 8-K dated December 15, 1999).

         Exhibit 19   Form of Amendment to Executive Officer Employment
                      Agreement (incorporated herein by reference to Exhibit
                      99.7 to the Company's Form 8-K dated December 15, 1999).

         Exhibit 20   Amendment No. 2 to the Company's Amended and Restated
                      Bylaws (incorporated herein by reference to Exhibit 3.1 to
                      the Company's Form 8-K dated December 15, 1999).

         Exhibit 21   Stock and Warrant Purchase Agreement dated December 1,
                      1999 among the Company, Enron North America Corp.,
                      Sundance Assets, L.P. and Joint Energy Development
                      Investments II Limited Partnership (incorporated herein by
                      reference to Exhibit 99.1 to the Company's Form 8-K dated
                      December 1, 1999).


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

Date: January 5, 2000.

                                                 /s/ Frank A. Wojtek
                                                ------------------------------
                                                Frank A. Wojtek



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