2011 Wells Drilled by Operator as of 11/30/2011
| Operator's Name | Non Marcellus | Marcellus | Total |
| A & S PROD INC | 8 | 8 | |
| ABARTA OIL & GAS CO INC | 18 | 18 | |
| AIRDALE OIL & GAS LLC | 18 | 18 | |
| ALLEGHENY ENTERPRISES INC | 3 | 3 | |
| ALPHA SHALE RES LP | 7 | 7 | |
| AMER NATURAL RESOURCES LLC | 22 | 22 | |
| ANADARKO E&P CO LP | 172 | 172 | |
| ANDERSON FAMILY FARM INC | 1 | 1 | |
| ARG RESOURCES INC | 12 | 12 | |
| ARK RESOURCES INC | 2 | 2 | |
| ARMAC RESOURCES | 1 | 1 | |
| ARMSTRONG GAS CO LLC | 2 | 2 | |
| ATLAS RESOURCES LLC | 8 | 8 | |
| B & B RESOURCES | 5 | 5 | |
| BARNES RESOURCES | 6 | 6 | |
| BARON GROUP INC | 3 | 3 | |
| BENSON ENERGY LLC | 1 | 1 | |
| BF ADVENTURES LLC | 7 | 7 | |
| BLX INC | 2 | 3 | 5 |
| BRANCH JOHN D | 7 | 7 | |
| BURNETT OIL CO INC | 1 | 1 | |
| CABOT OIL & GAS CORP | 54 | 54 | |
| CARRIZO (MARCELLUS) LLC | 2 | 44 | 46 |
| CATALYST ENERGY INC | 51 | 51 | |
| CHARIS ENERGY INC | 7 | 7 | |
| CHAUTAUQUA ENERGY INC | 4 | 4 | |
| CHESAPEAKE APPALACHIA LLC | 4 | 244 | 248 |
| CHESTNUT OIL LLC | 3 | 3 | |
| CHEVRON APPALACHIA LLC | 62 | 62 | |
| CHIEF OIL & GAS LLC | 50 | 50 | |
| CITRUS ENERGY CORP | 14 | 14 | |
| CNX GAS CO LLC | 41 | 41 | |
| COAL GAS RECOVERY LP | 4 | 4 | |
| CONSOL GAS CO | 28 | 28 | |
| COUGAR ENERGY INC | 21 | 21 | |
| CURTIS & SON OIL INC | 3 | 3 | |
| CURTIS OIL INC | 4 | 4 | |
| D & S ENERGY CORP | 9 | 9 | |
| DALLAS ENERGY LLC | 2 | 2 | |
| DANNIC ENERGY CORP | 8 | 8 | |
| DAVID L HILL | 1 | 1 | |
| DE LTD FAMILY PARTNERSHIP | 2 | 2 | |
| DEVONIAN RESOURCES INC | 14 | 14 | |
| DORSO LP | 3 | 3 | |
| DOUBLE J RESOURCES INC | 2 | 2 | |
| DROPTINE OIL PROD LLC | 2 | 2 | |
| DUHRING RESOURCE CO | 12 | 12 | |
| EAST RESOURCES MGMT LLC | 2 | 59 | 61 |
| ELDER OIL & GAS CO | 2 | 2 | |
| ENERGY CORP OF AMER | 10 | 10 | |
| ENERGY RESOURCES OF AMER INC | 1 | 1 | |
| ENERPLUS RES (USA) CORP | 2 | 2 | |
| ENERVEST OPR LLC | 32 | 32 | |
| EOG RESOURCES INC | 58 | 58 | |
| EQT PRODUCTION CO | 73 | 73 | |
| EXCO RESOURCES PA INC | 6 | 6 | |
| EXCO RESOURCES PA LLC | 36 | 36 | |
| EXOTIC OIL & GAS LLC | 2 | 2 | |
| FLATIRONS DEVELOPMENT LLC | 1 | 1 | |
| G & G GAS INC | 1 | 1 | |
| GALATI ENTERPRISES INC | 4 | 4 | |
| GAS & OIL MGMT ASSN INC | 6 | 6 | |
| GLENN D GAVIN & JOHN R GAVIN III | 1 | 1 | |
| GREAT PLAINS OPER LLC DBA GREAT MTN OPER | 1 | 1 | |
| HIGHHOUSE JAMES R | 2 | 2 | |
| HIGHPOINTE OIL & GAS LLC | 2 | 2 | |
| HOLDEN OIL & GAS | 1 | 1 | |
| HOMELAND ENERGY VENTURES LLC | 25 | 25 | |
| HOWARD DRILLING INC | 19 | 19 | |
| HUNT MARCELLUS OPERATING CO LLC | 5 | 5 | |
| IDC ENERGY CORP | 3 | 3 | |
| IMOD OIL PROD LLC | 8 | 8 | |
| INDIAN HILL GAS CO INC | 1 | 1 | |
| INTERSTATE GAS MKT INC | 14 | 14 | |
| INTREPID EXPL LLC | 1 | 1 | |
| J W OPERATING CO | 2 | 2 | |
| JAMES E MEAD MEAD OIL CO | 1 | 1 | |
| JONES DEV INC | 1 | 1 | |
| KASTLE RESOURCES ENTERPRISES INC | 6 | 6 | |
| KCS ENERGY INC | 2 | 2 | |
| KENNETH E & SANDRA K PLANTS | 1 | 1 | |
| KEYROCK ENERGY LLC | 23 | 23 | |
| KRIEBEL MINERALS INC | 18 | 18 | |
| KYLE MCNEAL & STEVEN MCNEAL DBA FOREST CHEM | 4 | 4 | |
| LAKE ERIE ENERGY PART LLC | 18 | 18 | |
| LEALI & LEALI OIL INC | 2 | 2 | |
| LINDELL & MANEY LLC | 2 | 2 | |
| MARCO DRILLING INC | 2 | 2 | |
| MCCOOL JOHN E | 3 | 3 | |
| MDS ENERGY LTD | 3 | 5 | 8 |
| MINARD RUN OIL CO | 22 | 22 | |
| MSL OIL & GAS CORP | 1 | 1 | |
| MTN V OIL & GAS INC | 1 | 1 | |
| NORTHEAST NATURAL ENERGY LLC | 3 | 3 | |
| NORTHEASTERN CONSOLIDATED ENERGY PARTNERS INC | 2 | 2 | |
| NTS ENERGY LLC | 2 | 2 | |
| OIL & GAS MGMT INC | 2 | 2 | |
| OIL REGION ALLIANCE OF BUS IND & TOURISM | 2 | 2 | |
| OPEN FLOW GAS SUPPLY CORP | 6 | 6 | |
| OZ GAS LTD | 2 | 2 | |
| PA GEN ENERGY CO LLC | 15 | 30 | 45 |
| PATRIOT EXPLORATION CORP | 2 | 1 | 3 |
| PENN VIEW EXPLORATION CORP | 9 | 9 | |
| PENN VIRGINIA OIL & GAS CORP | 6 | 6 | |
| PENNECO OIL CO INC | 40 | 40 | |
| PEOPLES NATURAL GAS CO LLC | 1 | 1 | |
| PHILLIPS EXPLORATION INC | 5 | 5 | |
| PHOENIX ENERGY PROD INC | 1 | 1 | |
| PIERCE & PETERSEN | 10 | 10 | |
| R OIL & GAS ENT INC | 2 | 2 | |
| RANGE RESOURCES APPALACHIA LLC | 2 | 159 | 161 |
| REX ENERGY OPERATING CORPORATION | 26 | 26 | |
| RICE DRILLING B LLC | 10 | 10 | |
| RIDGEVIEW GAS & OIL INC | 1 | 1 | |
| RISTAU RICKY J | 1 | 1 | |
| RUSS HOLDEN WELL SVC | 2 | 2 | |
| SANDSTONE DEV LLC | 5 | 5 | |
| SENECA RESOURCES CORP | 5 | 53 | 58 |
| SHEFFIELD LAND & TIMBER CO | 2 | 2 | |
| SHELLY OIL & GAS INC | 1 | 1 | |
| SK OPR INC | 1 | 1 | |
| SNYDER BROS INC | 47 | 16 | 63 |
| SOUTHWESTERN ENERGY PROD CO | 1 | 40 | 41 |
| STATESIDE ENERGY GROUP LLC | 6 | 6 | |
| SUSQUEHANNA EXPL & PROD LLC | 2 | 2 | |
| SV ABS INTEREST WETMORE PROJ | 9 | 9 | |
| SWEPI LP | 5 | 98 | 103 |
| SYLVAN ENERGY LLC | 3 | 3 | |
| TALISMAN ENERGY USA INC | 221 | 221 | |
| TANGLEWOOD EXPL LLC | 7 | 7 | |
| TENASKA RES LLC | 2 | 2 | |
| THE PRODUCTION CO | 2 | 2 | |
| TITUSVILLE OIL & GAS ASSOC INC | 11 | 11 | |
| TNT OIL CO | 2 | 2 | |
| TRIANA ENERGY LLC | 14 | 14 | |
| ULTRA RESOURCES INC | 2 | 2 | |
| UNIVERSAL RESOURCES HOLDINGS INC | 13 | 13 | |
| US ENERGY DEV CORP | 57 | 57 | |
| US ENERGY EXPLORATION CORP | 12 | 12 | |
| VISTA OPR INC | 31 | 31 | |
| WGM GAS CO INC | 6 | 6 | |
| WHITE OAK FARMS INC | 2 | 2 | |
| WHO LLC | 2 | 2 | |
| WILLIAM H BRAWAND | 6 | 6 | |
| WILLIAM MCINTIRE COAL OIL & GAS | 6 | 6 | |
| WILLIAMS PRODUCTION APPALACHIA LLC | 60 | 60 | |
| WILMOTH INTERESTS INC | 12 | 12 | |
| XTO ENERGY INC | 1 | 14 | 15 |
| Grand Total | 867 | 1,751 | 2,618 |