| ABARTA OIL & GAS CO., INC. – PITTSBURGH, PA | GASTAR EXPLORATION, INC. – HOUSTON, TX | RBS CITIZENS, N.A. – PITTSBURGH, PA |
| ABN AMRO – PLANO, TX | HG ENERGY, LLC – PARKERSBURG, WV | REGIONS BANK – HOUSTON, TX |
| ALLIANCE PETROLEUM CORP. – NORTH CANTON, OH | HUNTLEY & HUNTLEY, INC. – PITTSBURGH, PA | REPUBLIC ENERGY OPERATING, LLC – DALLAS, TX |
| ALPHA NATURAL RESOURCES – WAYNESBURG, PA | INFLECTION ENERGY, LLC – DENVER, CO | RESERVOIR CAPITAL GROUP – NEW YORK, NY |
| ANGELO, GORDON & CO. – HOUSTON, TX | JANA PARTNERS, LLC – NEW YORK, NY | REX ENERGY CORPORATION – STATE COLLEGE, PA |
| APEX ENERGY, LLC – WEXFORD, PA | JKLM ENERGY, LLC – SEWICKLEY, PA | RICE ENERGY, LLC – CANONSBURG, PA |
| APPALACHIAN MINERAL PARTNERS – PITTSBURGH, PA | JP MORGAN CHASE BANK, N.A. – FORTH WORTH, TX | RIVERSIDE ENERGY MICHIGAN LLC – THE WOODLANDS, TX |
| ARSENAL RESOURCES – WEXFORD, PA | KEYBANC CAPITAL MARKETS, INC. – HOUSTON, TX | RIVERSTONE INVESTMENT GROUP LLC – NEW YORK, NY |
| ATINUM ENERGY INVESTMENTS – HOUSTON, TX | LAUREL MOUNTAIN ENERGY, LLC – PITTSBURGH, PA | SAMCHULLY AMC – SEOUL, KOREA |
| ATLAS ENERGY, L.P. – FORTH WORTH, TX/NEW YORK, NY | LPR ENERGY, LLC – DALLAS, TX | SENECA RESOURCES CORPORATION – HOUSTON, TX |
| BAYSIDE CAPITAL – NEW YORK, NY | MARATHON PETROLEUM COMPANY, LP – FINDLAY, OH | SNYDER BROTHERS, INC. – KITTANING, PA |
| CARDINAL MIDSTREAM II, LLC – DALLAS, TX | MARKWEST ENERGY PARTNERS, L.P. – DENVER, CO | SOI ENERGI AB – STOCKHOLM, SWEDEN |
| CNOOC LIMITED – BEIJING, P.R. CHINA | MDS ENERGY DEVELOPMENT, LLC – KITTANING, PA | STONEPEAK INFRASTRUCTURE PARTNERS – NEW YORK, NY |
| COLUMBIA ENERGY VENTURES, LLC – CHARLESTON, WV | MIDSTREAM CAPITAL PARTNERS – HOUSTON, TX | SUMITOMO CORPORATION – TOKYO, JAPAN |
| COPANO ENERGY – HOUSTON, TX | MOUNTAINEER GAS SERVICES, LLC – HOUSTON, TX | SUMMIT DISCOVERY RESOURCES, LLC – HOUSTON, TX |
| DENHAM CAPITAL MANAGEMENT LP – HOUSTON, TX | NISOURCE CORPORATE SERVICES COMPANY – CHARLESTON, WV | SVENSKA OLJEINVESTERINGAR AB – STOCKHOLM, SWEDEN |
| DIRECT ENERGY, LP – PITTSBURGH, PA | OLJEINVEST LLC – THE WOODLANDS, TX | THE HUNTINGTON NATIONAL BANK – MORGANTOWN, WV |
| DIVERSIFIED GAS & OIL PLC – BIRMINGHAM, AL | PACHIRA COMPANY – NAPLES, FL | THREE RIVERS ROYALTY, LLC – DENVER, CO |
| DTE ENERGY – DETROIT, MI | PANORAMA RESOURCES, LLC – EDMOND, OK | TITAN ENERGY, LLC – FORT WORTH, TX/PHILADELPHIA, PA |
| EAST MANAGEMENT SERVICES, LP – SEWICKLEY, PA | PENN VIRGINIA CORPORATION – HOUSTON, TX | TORCHLIGHT ENERGY RESOURCES, INC. – PLANO, TX |
| ECLIPSE RESOURCES – STATE COLLEGE, PA | PENNENERGY RESOURCES, LLC – PITTSBURGH, PA | TOTAL E&P USA, INC. – HOUSTON, TX |
| EDGEMARC ENERGY HOLDINGS, LLC – CANONSBURG, PA | PETROSEEK, LLC – WICHITA FALLS, TX | TPG CAPITAL – SAN FRANCISCO, CA / NEW YORK, NY |
| ENCINO ENERGY, LLC – HOUSTON, TX | PINE MOUNTAIN OIL & GAS – ABINGDON, VA | TRANS ENERGY, INC – ST. MARY’S, WV |
| ENERVEST, LTD – HOUSTON, TX | PJT PARTNERS LP – NEW YORK, NY | TRILANTIC CAPITAL PARTNERS – NEW YORK, NY |
| EVERFLOW EASTERN PARTNERS LP – CANFIELD, OH | POST OAK ENERGY CAPITAL LP – HOUSTON, TX | VANTAGE ENERGY, LLC – ENGLEWOOD, CO |
| FALCON SEABOARD – HOUSTON, TX | PROTÉGÉ ENERGY III LLC – TULSA, OK | WASHINGTON GAS LIGHT COMPANY – WASHINGTON, DC |
| FIVE STATES ENERGY CAPITAL, LLC – DALLAS, TX | RANGE RESOURCES CORPORATION – FORT WORTH, TX | WHITE DEER ENERGY – NEW YORK, NY |