X0203 3 2009-09-15 0 0000788965 HALLADOR PETROLEUM CO HCPO 0001322415 Lubar Equity Fund, LLC 700 N. WATER STREET SUITE 1200 MILWAUKEE WI 53202 0 0 1 0 0001473033 Lubar & Co., Inc 700 NORTH WATER STREET SUITE 1200 MILWAUKEE WI 53202 0 0 1 0 0001032385 LUBAR DAVID J 770 NORTH WATER STREET SUITE 1200 MILWAUKEE WI 53202 0 0 1 0 Common Stock, par value $0.01 per share 2788685 D These securities are owned by Lubar Equity Fund, LLC ("LEF"), which is filing this report as a joint filer with David J. Lubar ("Mr. Lubar") and Lubar & Co., Incorporated ("Lubar & Co."). Lubar & Co., as manager of LEF, and Mr. Lubar, as a director of Lubar & Co., may be deemed to share voting and dispositive power as to the shares held by LEF. Mr. Lubar and Lubar & Co. disclaim beneficial ownership in the shares owned by LEF, except to the extent of their respective pecuniary interest therein. Information regarding the joint filers is attached hereto as Exhibit 99. Lubar Equity Fund, LLC BY /s/ David J. Lubar 2009-09-23 Lubar & Co., Incorporated BY /s/ David J. Lubar, President 2009-09-23 /s/ David J. Lubar 2009-09-23