| BWAB INC | 12251 | DENVER | 12 | 6 |
| BWB EXPLORATION LLC | 22497 | VANCOUVER | 0 | 0 |
| BWB OPERATING INC | 14120 | MIDLAND | 2 | 1 |
| BWB RESOURCES INC | 19294 | COLORADO SPRINGS | 1 | 1 |
| BXL CORPORATION | 21352 | WOODWARD | 0 | 0 |
| BYAM KENIS | 24650 | — | 0 | 0 |
| BYARS BILL INC | 14660 | OKMULGEE | 0 | 0 |
| BYNG ENERGY GROUP INC | 23800 | ENID | 64 | 24 |
| BYNG OPERATING LLCActive | 22055 | ADA | 116 | 3 |
| C & A OIL COMPANY | 5007 | EDMOND | 24 | 8 |
| C & B ENERGY RESOURCES | 10 | BARTLESVILLE | 0 | 0 |
| C & B OIL & GAS COMPANY | 10389 | DEPEW | 0 | 0 |
| C & B OIL COMPANY INC | 7110 | DRUMRIGHT | 25 | 5 |
| C & B PRODUCTION | 16703 | TULSA | 0 | 0 |
| C & C ENERGY COMPANY | 6567 | DALLAS | 13 | 4 |
| C & C OIL CO | 17111 | HOMINY | 0 | 0 |
| C & C PRODUCTIONS LLCActive | 22829 | muskogeee | 45 | 5 |
| C & C TANK TRUCK SERVICE INCActive | 6956 | HOLDENVILLE | 0 | 0 |
| C & C TANK TRUCK SERVICE INC | 8917 | ENID | 0 | 0 |
| C & D DRILLING COMPANY | 324 | HENNEPIN | 4 | 2 |
| C & D SUPPLY | 18385 | CHEROKEE | 12 | 4 |
| C & D SUPPLY LLCActive | 23178 | CHEROKEE | 11 | 2 |
| C & E OIL CORPORATION | 3477 | OKLAHOMA CITY | 7 | 4 |
| C & F INC | 17519 | SAPULPA | 0 | 0 |
| C & F OPERATING | 17709 | DUNCAN | 0 | 0 |
| C & G OILS LLC | 22008 | SHAWNEE | 0 | 0 |
| C & H OIL COMPANY | 19965 | WALTERS | 0 | 0 |
| C & H OIL COMPANY | 326 | RATLIFF CITY | 0 | 0 |
| C & H OIL COMPANY | 6844 | MANGUM | 0 | 0 |
| C & H TOOL COMPANY INC | 8277 | ADA | 12 | 1 |
| C & J ENERGY | 13745 | LEXINGTON | 0 | 0 |
| C & J EXPLORATION LLC | 19410 | COLORADO SPRINGS | 48 | 8 |
| C & J OIL CO | 11219 | ADA | 0 | 0 |
| C & J OILFIELD SERVICES INCActive | 24831 | FOX | 0 | 0 |
| C & J TRUCKS LLCActive | 327 | SEMINOLE | 7 | 4 |
| C & K PETROLEUM INC | 4655 | HOUSTON | 0 | 0 |
| C & L DRILLING COMPANY | 328 | ADA | 6 | 2 |
| C & L ENTERPRISE OF WAGONER | 15045 | COWETA | 3 | 2 |
| C & L ENTERPRISES INCActive | 16769 | LINDSAY | 9 | 3 |
| C & L EXPLORATION | 11248 | TULSA | 1 | 1 |
| C & L OIL AND GAS CORPORATIONActive | 11973 | NORMAN | 84 | 21 |
| C & L OIL COMPANY | 329 | BRISTOW | 0 | 0 |
| C & L PRODUCTION COMPANY | 19002 | RATLIFF CITY | 1 | 1 |
| C & M EXPLORATION LLC | 21978 | TULSA | 2 | 1 |
| C & M OIL COMPANY INC | 20201 | MUSTANG | 2 | 1 |
| C & M OPERATING COMPANY | 14003 | HENRYETTA | 14 | 1 |
| C & M OPERATING INC | 18554 | KINGFISHER | 0 | 0 |
| C & P ENERGY CORPORATION | 12868 | SHAWNEE | 2 | 2 |
| C & P OIL COMPANY | 13137 | OKEMAH | 0 | 0 |
| C & R PETROLEUM COMPANYActive | 19737 | DUNCAN | 183 | 4 |
| C & S OIL CO | 19181 | CLEVELAND | 0 | 0 |
| C & S PLUGGING | 17957 | HENNESSEY | 13 | 5 |
| C & T ENERGY CO | 17317 | BARTLESVILLE | 0 | 0 |
| C & T ENERGY LLCActive | 20636 | MORRIS | 38 | 2 |
| C & W OPERATING LLCActive | 23722 | TULSA | 16 | 1 |
| C & Y CASING PULLING COMPANYActive | 333 | DUNCAN | 33 | 10 |
| C A F ENERGY CORP | 14067 | SEMINOLE | 0 | 0 |
| C AND G OIL COMPANY | 941 | SEMINOLE | 0 | 0 |
| C B ENERGY RESOURCES | 14664 | BARTLESVILLE | 0 | 0 |
| C BAR C RESOURCES LLCActive | 24733 | ANADARKO | 1 | 1 |
| C BAR K ENTERPRISES INC | 21336 | OKLAHOMA CITY | 0 | 0 |
| C C & S LEASING & DRILLING | 14385 | WAGONER | 0 | 0 |
| C C B OIL INC | 13157 | RATLIFF CITY | 0 | 0 |
| C C F OIL COMPANY | 13954 | BARTLESVILLE | 0 | 0 |
| C C H OPERATING COMPANY | 13594 | TULSA | 0 | 0 |
| C D H TRUST INC | 17011 | GALVA | 0 | 0 |
| C D OPERATING COMPANY INC | 16119 | OKLAHOMA CITY | 15 | 8 |
| C E D LC | 19073 | ENID | 71 | 14 |
| C E HARMON OIL INCActive | 10266 | TULSA | 156 | 3 |
| C E L INC | 18624 | BARTLESVILLE | 22 | 1 |
| C E SCOTT OIL PROPERTIES INC | 19205 | CYRIL | 0 | 0 |
| C F & L PRODUCING COMPANY | 18736 | LINDSAY | 1 | 1 |
| C F OIL & GAS CORP | 13014 | ENGLEWOOD | 0 | 0 |
| C H E COMPANY INC | 10862 | SHAWNEE | 0 | 0 |
| C H G PRODUCTION CO INC | 15176 | TULSA | 0 | 0 |
| C I G EXPLORATION INC | 5587 | HOUSTON | 1 | 1 |
| C J OPERATING COMPANY INC | 12732 | NORMAN | 7 | 5 |
| C L & F OPERATING LLC | 23689 | HOUSTON | 0 | 0 |
| C L & S OIL COMPANY INC | 8698 | PERRY | 12 | 3 |
| C M OIL & GAS CORP | 17449 | DALLAS | 0 | 0 |
| C N G PRODUCING CO | 12012 | TULSA | 3 | 3 |
| C N OPERATING CO | 16351 | DRUMRIGHT | 2 | 1 |
| C N OPERATING COMPANY | 6394 | DRUMRIGHT | 20 | 5 |
| C O & G OPERATING CO INC | 15782 | STILLWATER | 2 | 2 |
| C O & G PRODUCTION GROUP LLC | 22100 | JOPLIN | 6 | 1 |
| C O F OIL COMPANY | 13103 | KONAWA | 0 | 0 |
| C O M OPERATING COMPANY | 13735 | TULSA | 0 | 0 |
| C P BOWLING GAS INC | 16981 | BLACKWELL | 0 | 0 |
| C R D OIL CORPORATION | 21859 | HOMINY | 0 | 0 |
| C S PETROLEUM INC | 11036 | NORMAN | 0 | 0 |
| C&C TANK SERVICE LLCActive | 24259 | Blanchard | 1 | 1 |
| C-DOG OPERATING CO | 18322 | MOUND | 3 | 1 |
| C-H OIL CO | 17081 | BARTLESVILLE | 0 | 0 |
| C-WATER DISPOSAL INC | 19451 | OKLAHOMA CITY | 1 | 1 |
| C5 ENERGY LLC | 22636 | OWASSO | 0 | 0 |
| CABCO ENERGY CORPORATION | 13969 | HOFFMAN | 2 | 1 |
| CABE TOM INVESTMENT INC | 15203 | DALLAS | 1 | 1 |
| CABEEN EXPLORATION CORP | 334 | LOS ANGELES | 0 | 0 |
| CABEEN EXPLORATION CORP | 7411 | NORTH HOLLYWOOD | 0 | 0 |
| CABLE W S | 17978 | CLEVELAND | 0 | 0 |
| CABOT EXPLORATION CORP | 17361 | HOUSTON | 2 | 2 |
| CABOT OIL & GAS CORPORATION | 18246 | HOUSTON | 104 | 16 |
| CABOT PETROLEUM CORPORATION | 335 | ENGLEWOOD | 1 | 1 |
| CACTUS ENERGY COMPANY LLCActive | 21818 | HENNESSEY | 11 | 5 |
| CACTUS OIL & GAS LLC | 22421 | SEMINOLE | 0 | 0 |
| CACTUS OIL COMPANY | 5493 | PAMPA | 0 | 0 |
| CACTUS OPERATING COMPANY | 336 | WICHITA FALLS | 3 | 2 |
| CADDO EXPLORATION, LLCActive | 24930 | Norman | 12 | 5 |
| CADDO OIL & GAS INC | 13087 | OKLAHOMA CITY | 8 | 1 |
| CADDO-MARCHAND LC | 4851 | DALLAS | 3 | 1 |
| CADE ENERGY LLCActive | 25235 | NASH | 1 | 1 |
| CADWELL CLYDE L | 13823 | ARNETT | 0 | 0 |
| CAERUS KANSAS LLC | 23029 | DENVER | 11 | 1 |
| CAF DIVERSIFIED ENTERPRISE INC | 18218 | OKLAHOMA CITY | 5 | 5 |
| CAF OIL COMPANY | 17577 | DUNCAN | 1 | 1 |
| CAGO INC AN OKLA CORPORATION | 13197 | COLLEGE STATION | 0 | 0 |
| CAHO PRODUCTIONS INC | 14258 | TULSA | 0 | 0 |
| CAIN RANDY AActive | 16265 | DUNCAN | 35 | 2 |
| CAIN RICHARD | 6630 | COMANCHE | 0 | 0 |
| CAJEZA ENERGY | 17028 | DRUMRIGHT | 4 | 3 |
| CAL ENERGY RESOURCES LTD | 21331 | OKLAHOMA CITY | 0 | 0 |
| CAL-JAI CONSULTING INC | 17013 | LITTLETON | 1 | 1 |
| CAL-MAC OIL COMPANY INC | 5839 | BARTLESVILLE | 2 | 1 |
| CALCUTA PETROLEUM LLCActive | 24921 | Edmond | 2 | 1 |
| CALDWELL ENGINEERING & CONSTRUCTION INCActive | 22569 | CHANDLER | 11 | 1 |
| CALDWELL JAMES I | 15022 | WOODWARD | 1 | 1 |
| CALEBS RESOURCES LLCActive | 20561 | Edmond | 7 | 2 |
| CALGARY ENERGY LLCActive | 22620 | SKIATOOK | 2 | 1 |
| CALIBER RESOURCES LLC | 24032 | OKLAHOMA CITY | 0 | 0 |
| CALIFORNIA SW OPERATING INC | 12938 | LOS ANGELES | 66 | 23 |
| CALL HAROLD CHARLESActive | 22274 | DEWEY | 20 | 1 |
| CALL HAROLD LEROY | 7167 | COPAN | 1 | 1 |
| CALLAHAN GARY A | 8173 | WAGONER | 3 | 2 |
| CALLAN CALLAN & VAHRENKAMP | 13290 | AMARILLO | 0 | 0 |
| CALLAWAY MICHAEL D | 12274 | SAPULPA | 0 | 0 |
| CALLIE OIL COMPANY LLCActive | 23711 | PERRY | 44 | 6 |
| CALLIXYLON OPERATING LLC | 23510 | BROKEN ARROW | 14 | 1 |
| CALLON PETROLEUM COMPANY | 12518 | NATCHEZ | 11 | 6 |
| CALPINE NATURAL GAS COMPANY LP | 20240 | HOUSTON | 1 | 1 |
| CALTEX LTD | 16475 | DALLAS | 0 | 0 |
| CALUMET OIL COMPANY | 13292 | OKLAHOMA CITY | 56 | 7 |
| CALVERT COMPANY (THE) | 17239 | OKLAHOMA CITY | 0 | 0 |
| CALVERT DRILLING COMPANY | 4230 | OKLAHOMA CITY | 77 | 15 |
| CALVERT HORACE K | 14446 | OKLAHOMA CITY | 0 | 0 |
| CALVERT OPERATING LLCActive | 22765 | OKLAHOMA CITY | 26 | 3 |
| CALYX ENERGY III LLCActive | 23515 | TULSA | 197 | 4 |
| CALYX ENERGY IV LLC | 24676 | — | 1 | 1 |
| CALYX ENERGY LLC | 22299 | TULSA | 23 | 3 |
| CAM DEVELOPMENT & PROD CO | 11967 | AMARILLO | 0 | 0 |
| CAM WIRELINE SERVICES INC | 17206 | AMARILLO | 3 | 2 |
| CAMCO OIL & GAS COMPANY INC | 14387 | CLAREMORE | 1 | 1 |
| CAMELOT ENERGY RESOURCES LLC | 22324 | TULSA | 0 | 0 |
| CAMELOT HOLDING CORPORATION | 14278 | TULSA | 0 | 0 |
| CAMERON JR GEORGE INC | 349 | OKLAHOMA CITY | 0 | 0 |
| CAMERON JR PAUL E INC | 18693 | HOUSTON | 0 | 0 |
| CAMERON MIRIAM | 15897 | MARIETTA | 0 | 0 |
| CAMINO NATURAL RESOURCES LLCActive | 24097 | DENVER | 104 | 5 |
| CAMO OIL LLCActive | 23702 | STILLWATER | 83 | 2 |
| CAMP DENNIS | 17836 | RATLIFF CITY | 1 | 1 |
| CAMPANA PETROLEUM INC | 14388 | OKLAHOMA CITY | 0 | 0 |
| CAMPANERO ENERGY HOLDINGS LLC | 22196 | DALLAS | 3 | 2 |
| CAMPANERO ENERGY LLC | 22164 | HOUSTON | 0 | 0 |
| CAMPBELL B R | 3898 | ARDMORE | 2 | 2 |
| CAMPBELL CARLA J | 22460 | KONAWA | 0 | 0 |
| CAMPBELL COX WIDDOWS & SWEENEY | 16135 | HOUSTON | 0 | 0 |
| CAMPBELL DON G | 18001 | KONAWA | 0 | 0 |
| CAMPBELL ENTERPRISES INC | 6575 | OKMULGEE | 7 | 6 |
| CAMPBELL GERALDINE | 19875 | ARDMORE | 0 | 0 |
| CAMPBELL JR ROBERT F | 15023 | WICHITA FALLS | 0 | 0 |
| CAMPBELL PRODUCTION COMPANY | 21486 | TULSA | 1 | 1 |
| CAMPBELL R M | 351 | BARTLESVILLE | 0 | 0 |
| CAMPETCO | 13281 | TULSA | 2 | 1 |
| CANAAN ENERGY CORPORATION | 18960 | OKLAHOMA CITY | 32 | 13 |
| CANAAN EXPL & PROD CO INC | 19971 | OKLAHOMA CITY | 0 | 0 |
| CANAAN EXPLORATION INC | 11922 | OKLAHOMA CITY | 8 | 2 |
| CANAAN NATURAL GAS CORP | 21270 | OKLAHOMA CITY | 0 | 0 |
| CANAAN OPERATING LLC | 24621 | — | 2 | 2 |
| CANAAN PETROLEUM INCActive | 11930 | SAN ANTONIO | 6 | 1 |
| CANAAN RESOURCES LLC | 22027 | OKLAHOMA CITY | 2 | 1 |
| CANAAN RESOURCES X LLC | 22370 | OKLAHOMA CITY | 10 | 3 |
| CANADIAN RIVER RESOURCES, LLC | 20700 | SIOUX FALLS | 0 | 0 |
| CANADIAN VALLEY RESOURCES LLCActive | 22582 | CANADIAN | 14 | 4 |
| CANAM OIL & GAS INC | 14454 | OKLAHOMA CITY | 0 | 0 |
| CANAM PRODUCTION INC | 17241 | OKLAHOMA CITY | 0 | 0 |
| CANAM SUPPLY INC | 19075 | OKLAHOMA CITY | 0 | 0 |
| CANAN THOMAS C | 5029 | WICHITA FALLS | 0 | 0 |
| CANARD COLVERT OPERATING LLCActive | 24605 | DALLAS | 7 | 5 |
| CANDOR GATHERING, LLCActive | 25155 | ARDMORE | 0 | 0 |
| CANDY OIL COMPANY | 13751 | SAND SPRINGS | 0 | 0 |
| CANDY OIL PRODUCTION | 12878 | SAND SPRINGS | 5 | 1 |
| CANE CREEK ENERGY PARTNERS INCActive | 21815 | Morris | 33 | 1 |
| CANE CREEK RESOURCES LLCActive | 25279 | BOYNTON | 0 | 0 |
| CANEY RIVER ASSOCIATES LLCActive | 24287 | BARTLESVILLE | 14 | 1 |
| CANEY VALLEY DRILLING CO INC | 18327 | CANEY | 0 | 0 |
| CANEY VALLEY OIL & GAS INC | 22125 | COWETA | 2 | 1 |
| CANNADY DRILLING COMPANY | 13699 | PONCA CITY | 0 | 0 |
| CANNON ENERGY INC | 21497 | TULSA | 7 | 4 |
| CANNON OPERATING CO LLC | 23102 | GARLAND | 6 | 2 |
| CANNUCK RESOURCES INC | 11712 | NOWATA | 0 | 0 |
| CANNUCK RESOURCES INC | 8747 | NOWATA | 0 | 0 |