X0202 4 2005-06-30 0 0001059324 PETROHAWK ENERGY CORP HAWK 0001290913 EnCap Equity Fund IV GP, LP 1100 LOUISIANA SUITE 3150 HOUSTON TX 77002 0 0 1 0 Common Stock 2005-06-30 4 C 0 8750000 4 A 12024689 I by EnCap Energy Capital Fund IV L.P. and PHAWK LLC 8% Convertible Promissory Note 4 2005-06-30 4 C 0 35000000 0 D 2005-06-30 2009-05-25 Common Stock 8750000 0 I by PHAWK LLC Represents 28,932 shares owned by EnCap Energy Capital Fund IV, L.P. and 11,995,757 shares owned by PHAWK, LLC. The reporting person disclaims any beneficial ownership of the securities owned by PHAWK, LLC or EnCap Energy Capital Fund IV, L.P. in excess of its pecuniary interest in such securities. On June 30, 2005, the Issuer amended the date the 8% convertible promissory note was convertible to allow for the conversion thereof on June 30, 2005 instead of May 25, 2006. EnCap Equity Fund IV GP, L.P., by EnCap Investments L.P., its general partner, by EnCap Investments GP, L.L.C., its general partner, by /s/ David B. Miller, Senior Managing Director 2005-07-05