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


                                  SCHEDULE 13G
                    Under the Securities Exchange Act of 1934


                             Petrohawk Energy Corp.
                ------------------------------------------------

                                (Name of Issuer)

                    Common Stock, par Value $0.001 per Share
        ------------------------------------------------------------------
                         (Title of Class of Securities)

                                    716495106
                  --------------------------------------------
                                 (CUSIP Number)

                                 January 31,2005
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             (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).




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CUSIP No.716495106               SCHEDULE 13G           Page  2  of 5 Pages

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

            North Sound Capital LLC (1)
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2       CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP*
                                                       (a) [x]
                                                       (b) [ ]

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3       SEC USE ONLY

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4       CITIZENSHIP OR PLACE OF ORGANIZATION

            Delaware
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                        5      SOLE VOTING POWER
      NUMBER OF                 0
        SHARES          -------------------------------------------------------
     BENEFICIALLY       6      SHARED VOTING POWER
       OWNED BY                 2,300,000
         EACH           -------------------------------------------------------
      REPORTING         7      SOLE DISPOSITIVE POWER
        PERSON                  0
         WITH           -------------------------------------------------------
                        8      SHARED DISPOSITIVE POWER
                                2,300,000
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9       AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON

            2,300,000
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10      CHECK BOX IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES*
                                                                           [ ]
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11      PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW 9

            5.79%
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12      TYPE OF REPORTING PERSON*

            OO
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(1)
         The ultimate managing member of North Sound Capital LLC is Thomas
         McAuley. The Reporting Person may be deemed the beneficial owner of the
         shares in its capacity as the managing member of North Sound Legacy
         Fund LLC and North Sound Legacy Institutional Fund LLC and the
         investment advisor of North Sound Legacy International Ltd. (the
         "Funds"), who are the holders of such shares. As the managing member or
         investment advisor, respectively, of the Funds, the Reporting Person
         has voting and investment control with respect to the shares of common
         stock held by the Funds.



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CUSIP No.716495106              SCHEDULE 13G           Page   3  of   5  Pages

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Item 1(a).        Name of Issuer:
                  Petrohawk Energy Corp.


Item 1(b).        Address of Issuer's Principal Executive Offices:

                  1100 Louisiana, Suite 4400
                  Houston, TX 77002

Item 2(a).        Name of Person Filing.
Item 2(b).        Address of Principal Business Office or, if None, Residence.
Item 2(c).        Citizenship.

                  North Sound Capital LLC
                  53 Forest Avenue, Suite 202
                  Old Greenwich, CT 06870
                  Delaware limited liability company

Item 2(d).        Title of Class of Securities:

                  Common Stock, par Value $0.001 per Share

Item 2(e).        CUSIP Number:

                  716495106

Item 3.           If this statement is filed pursuant to ss.ss.240.13d-1(b) or 
                  240.13d-2(b) or (c), check whether the person filing is a:

                  Not Applicable

Item 4.           Ownership.

                  The following is information regarding the aggregate number
                  and percentage of the class of securities of the issuer 
                  identified in Item 1:

                  (a) Amount beneficially owned: 2,300,000 shares of Common
                        Stock

                  (b) Percent of Class:5.79%

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

                           (i) sole power to vote or direct the vote: 0

                           (ii) shared power to vote or direct the vote:
                                2,300,000



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CUSIP No.716495106               SCHEDULE 13G          Page   4  of   5  Pages

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                           (iii) sole power to dispose or direct the disposition
                                of: 0

                           (iv) shared power to dispose or direct the
                                disposition of: 2,300,000

Item 5.           Ownership of Five Percent or Less of a Class.

                  Not Applicable



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

Item 10.          Certification.

                  Certification pursuant to ss.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.



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CUSIP No.716495106             SCHEDULE 13G           Page   5  of   5  Pages

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                                    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.

         Dated:  January 28, 2005


                                NORTH SOUND CAPITAL LLC


                             By:      /s/ Thomas McAuley
                                      --------------------
                             Name:    Thomas McAuley
                             Title:   Chief Investment Officer