| ROCKWELL DRILLING COMPANY | 8562 | NEW YORK | 6 | 1 |
| ROCKWELL ENERGY CORPORATION | 13492 | OKLAHOMA CITY | 0 | 0 |
| ROCKWELL ENERGY CORPORATION | 17478 | TULSA | 0 | 0 |
| ROCKWELL PETROLEUM CORPORATION | 5996 | OKLAHOMA CITY | 3 | 1 |
| ROCKY MOUNTAIN OIL & MIN INC | 20601 | BILLINGS | 2 | 1 |
| ROCKY ROADS OPERATING LLCActive | 24395 | TULSA | 657 | 10 |
| ROCKY TOP ENERGY LLCActive | 22945 | BARTLESVILLE | 97 | 6 |
| RODEBUSH INC | 18094 | KONAWA | 0 | 0 |
| RODGERS DONALD E JR | 11225 | RIPLEY | 1 | 1 |
| RODGERS TERRY | 19347 | CUSHING | 1 | 1 |
| RODMAN GEORGE INC | 5807 | OKLAHOMA CITY | 4 | 4 |
| RODMAN PETROLEUM CORPORATIONActive | 6657 | AUSTIN | 35 | 10 |
| ROE OIL COMPANY | 5992 | CUSHING | 13 | 4 |
| ROEBUCK BARNEY | 19600 | NOWATA | 0 | 0 |
| ROEBUCK II MELVIN | 18905 | NOWATA | 0 | 0 |
| ROEMER OIL COMPANY | 17797 | DENVER | 0 | 0 |
| ROFF OPERATING COMPANY LLC | 21267 | HOUSTON | 6 | 2 |
| ROGERS COUNTY COAL SEAM LLC | 20920 | RIDGELAND | 55 | 1 |
| ROGERS DAN R | 4897 | OKEMAH | 10 | 2 |
| ROGERS DONALD L | 18909 | HASKELL | 0 | 0 |
| ROGERS EARL A | 5177 | TULSA | 0 | 0 |
| ROGERS GARDNER E | 17034 | CORPUS CHRISTI | 0 | 0 |
| ROGERS JERRY L | 12728 | CUSHING | 59 | 9 |
| ROGERS KENNETH W | 1853 | MORRIS | 1 | 1 |
| ROGERS R L | 1856 | ENID | 2 | 2 |
| ROGERS RESOURCES INC | 11306 | ENID | 9 | 1 |
| ROGERS ROY E | 15725 | NEWKIRK | 1 | 1 |
| ROGERS S K OIL COMPANY | 14109 | LEVELLAND | 0 | 0 |
| ROGERS WELL SERVICE INC | 10059 | PONCA CITY | 4 | 2 |
| ROHR LOUIS J | 17940 | OKLAHOMA CITY | 0 | 0 |
| ROIL ENERGY INC | 14050 | PIEDMONT | 0 | 0 |
| ROKA MANAGEMENT INCActive | 22932 | OKLAHOMA CITY | 17 | 5 |
| ROKA RESOURCES INC | 18335 | OKLAHOMA CITY | 0 | 0 |
| ROLLYSON CORPORATION | 8445 | FORT SMITH | 6 | 2 |
| ROMAR PETROLEUM CORPORATION | 14108 | CATOOSA | 0 | 0 |
| ROMAX CORPORATION | 19057 | ARDMORE | 2 | 1 |
| ROMINE OIL & GAS LTD | 17773 | SHAWNEE | 2 | 2 |
| ROMINE RONNIE L | 18788 | INDIANOLA | 0 | 0 |
| ROMOCO INC | 17988 | BOULDER | 0 | 0 |
| ROMSCO ENGINEERING | 13497 | EDMOND | 0 | 0 |
| RON & DAN'S OIL LTD | 7863 | BARNSDALL | 7 | 3 |
| RONAN COMPANY | 10555 | SPRINGFIELD | 0 | 0 |
| RONCO ENERGY RESOURCES INC | 7758 | NORMAN | 1 | 1 |
| RONGEY IRA E | 5562 | SAPULPA | 20 | 1 |
| RONGEY OIL | 2962 | JENKS | 16 | 3 |
| RONIN OPERATING LLC | 22456 | TULSA | 0 | 0 |
| RONKO INDUSTRIES | 12856 | TULSA | 0 | 0 |
| RONMAR ENGINEERING & EXPL INC | 7552 | ADA | 10 | 4 |
| ROONEY OIL COMPANY | 3476 | TULSA | 0 | 0 |
| ROOT EDWARD A | 15936 | RED ROCK | 7 | 1 |
| ROOT W C | 1862 | KELLYVILLE | 0 | 0 |
| ROPET INC | 16451 | TULSA | 2 | 2 |
| RORING ARTHURActive | 24613 | RATLIFF CITY | 1 | 1 |
| RORING JR ROY W | 17838 | DUNCAN | 1 | 1 |
| RORING ROY W | 2822 | ARDMORE | 3 | 3 |
| RORING STEVEN A | 19891 | RATLIFF CITY | 0 | 0 |
| ROSE DAN AND BILLActive | 17138 | HENRYETTA | 52 | 3 |
| ROSE OIL & GAS COMPANY | 15547 | NOWATA | 0 | 0 |
| ROSE OPERATING COMPANY | 13490 | TULSA | 52 | 7 |
| ROSE PETROLEUM CORP | 11177 | OKLAHOMA CITY | 0 | 0 |
| ROSE ROCK MIDSTREAMActive | 23157 | OKLAHOMA CITY | 0 | 0 |
| ROSE ROCK RESOURCES INCActive | 20173 | WAGONER | 123 | 9 |
| ROSEANN ROYALTIES INC | 12754 | OKMULGEE | 0 | 0 |
| ROSEL COMPANY THE | 18030 | LIBERAL | 0 | 0 |
| ROSELAND OIL & GAS INC | 18601 | GARLAND | 1 | 1 |
| ROSETTA RESOURCES OPERATING LP | 21154 | HOUSTON | 1 | 1 |
| ROSEWOOD ENTERPRISES INC | 7283 | DALLAS | 1 | 1 |
| ROSEWOOD RESOURCES INC | 12710 | DALLAS | 105 | 25 |
| ROSHEL OIL COMPANY | 12809 | SULPHUR | 0 | 0 |
| ROSIERE ROBERT R & DORIS V | 19817 | STILLWATER | 0 | 0 |
| ROSS BOBBY LActive | 6245 | OKMULGEE | 8 | 1 |
| ROSS CURTIS | 20485 | ADA | 0 | 0 |
| ROSS EXPLORATION & PRODUCTION INC | 23851 | ARLINGTON | 0 | 0 |
| ROSS EXPLORATIONS INC | 21013 | FORT SMITH | 1 | 1 |
| ROSSER ROBERT A | 5778 | CHARLOTTE | 0 | 0 |
| ROSSTIN PROPERTIES LLCActive | 24355 | CAMERON | 6 | 1 |
| ROTH CAL ENTERPRISES | 17319 | MANNFORD | 0 | 0 |
| ROTH GARY E | 5837 | TONKAWA | 8 | 2 |
| ROUBIDOUX DISPOSAL CO LLCActive | 24323 | COPAN | 1 | 1 |
| ROUGEOT JOHN E | 1867 | TULSA | 0 | 0 |
| ROUGEOT OIL & GAS CORP | 6028 | SPERRY | 3 | 3 |
| ROUGH RIDER OIL LLC | 20975 | BOOKER | 0 | 0 |
| ROUGH RIDER OIL LLCActive | 24723 | OOLOGAH | 0 | 0 |
| ROULSTON PATActive | 10936 | KONAWA | 7 | 1 |
| ROULSTON ROBERT LActive | 22153 | KONAWA | 3 | 1 |
| ROUND UP OIL II LLCActive | 23390 | SPRINGER | 7 | 1 |
| ROUNDUP OIL LLCActive | 15970 | SPRINGER | 8 | 2 |
| ROUSTABOUT SERVICE COMPANY | 5312 | COALGATE | 3 | 1 |
| ROVER OPERATING LLC | 23934 | PLANO | 1 | 1 |
| ROWAN OIL COMPANY | 13803 | BRISTOW | 0 | 0 |
| ROWE ENERGY | 5877 | BEGGS | 10 | 4 |
| ROWE STEPHEN OIL PROPERTIES LLC | 21228 | HUNT | 2 | 1 |
| ROWLEY EDGAR | 6453 | HASKELL | 1 | 1 |
| ROWSEY SHARON G | 16448 | ATWOOD | 0 | 0 |
| ROX EXPLORATION INCActive | 18783 | NORMAN | 39 | 11 |
| ROX PETROLEUM INC | 13142 | OKLAHOMA CITY | 1 | 1 |
| ROXANNA OIL COMPANY | 15691 | OKLAHOMA CITY | 3 | 3 |
| ROY EL PETROLEUM COMPANY | 5002 | OKLAHOMA CITY | 1 | 1 |
| ROY G OIL COMPANY | 5108 | DRUMRIGHT | 5 | 1 |
| ROY L ASHTON OIL & GAS PRODUCTION INCActive | 20043 | SAPULPA | 19 | 1 |
| ROYAL DRILLING INC | 10994 | ADA | 0 | 0 |
| ROYAL ENERGY RESOURCES LTD | 16761 | DENVER | 2 | 2 |
| ROYAL OAKS PETROLEUM CORP | 11708 | FORT WORTH | 8 | 2 |
| ROYAL OIL & GAS CORP | 1870 | INDIANA | 58 | 11 |
| ROYAL OIL & GAS LLC | 23667 | SKIATOOK | 0 | 0 |
| ROYAL OPERATING COMPANY | 4358 | NORMAN | 0 | 0 |
| ROYAL OPERATING LLC | 21153 | HOLDENVILLE | 0 | 0 |
| ROYAL PETROLEUM | 17224 | LIBERAL | 1 | 1 |
| ROYAL PETROLEUM CORPORATION | 1871 | DALLAS | 3 | 2 |
| ROYAL PRODUCTION INC OKLA | 15423 | TULSA | 1 | 1 |
| ROYAL PRODUCTIONS INC | 12779 | TULSA | 0 | 0 |
| ROYAL RESOURCES INC | 16745 | OKLAHOMA CITY | 0 | 0 |
| ROYALE ENERGY INC | 20940 | SAN DIEGO | 1 | 1 |
| ROYALTY ENERGY DEVELOPMENT LLCActive | 24464 | EDMOND | 142 | 16 |
| ROYALTY LEASING DEV CO INC | 7372 | OKMULGEE | 0 | 0 |
| ROYALTY LEASING INC | 8239 | OKMULGEE | 4 | 1 |
| ROYALTY PETROLEUM COMPANY | 7294 | OKLAHOMA CITY | 2 | 2 |
| ROYALTY STAR PETROLEUM INC | 12127 | TULSA | 11 | 3 |
| ROYE REALTY & DEVELOPING INC | 6886 | STIGLER | 11 | 4 |
| RPA ENERGY LLCActive | 24981 | ADA | 21 | 1 |
| RPM OILFIELD SERVICES LLCActive | 24228 | LINDSAY | 14 | 5 |
| RR OIL WELL OPERATIONS LLCActive | 23399 | RINGWOOD | 39 | 10 |
| RR OILFIELD RENTAL SERVICES LLC | 23022 | RINGWOOD | 0 | 0 |
| RRK PRODUCTION INC | 19460 | BURKBURNETT | 0 | 0 |
| RT ENERGY COMPANY LLCActive | 21762 | SEMINOLE | 3 | 1 |
| RTB OIL INC | 22218 | CRESCENT | 9 | 2 |
| RTC RESOURCES LLPActive | 20684 | WEATHERFORD | 14 | 6 |
| RTD INC | 16033 | BARTLESVILLE | 1 | 0 |
| RUDMAN M B | 3281 | DALLAS | 0 | 0 |
| RUE JOHNNY BActive | 19401 | DUNCAN | 13 | 1 |
| RUFFEL LANCE OIL & GAS CORP | 23306 | — | 0 | 0 |
| RUGGS DAVID I | 19020 | DAVIS | 0 | 0 |
| RUH OIL COMPANYActive | 15984 | COLLINSVILLE | 38 | 2 |
| RULEXCO INC | 21541 | DALLAS | 1 | 1 |
| RUMBAUGH R G | 11264 | CLAREMORE | 0 | 0 |
| RUMBLE ENERGY LLCActive | 25122 | Skiatook | 25 | 2 |
| RUMLEY MATTHEW A DBA RUMLEY & ASSOCIATESActive | 23634 | Tulsa | 5 | 3 |
| RUMLEY ROBERT A & ASSOCIATES | 4423 | TULSA | 7 | 2 |
| RUNNING BEAR OIL & GAS CORPActive | 23272 | NOWATA | 22 | 2 |
| RUPE OIL COMPANY INC | 4990 | WICHITA | 3 | 2 |
| RUSCO PETROLEUM | 8587 | COWETA | 0 | 0 |
| RUSH CREEK OPERATING LLCActive | 23895 | MCKINNEY | 75 | 5 |
| RUSH-ANDRUS ENGINEERING | 17141 | ROYSE CITY | 2 | 1 |
| RUSHCO | 14628 | HOLDENVILLE | 0 | 0 |
| RUSHING ARLIE L | 18593 | MONROE | 0 | 0 |
| RUSHMORE PETROLEUM CO INC | 12247 | AURORA | 0 | 0 |
| RUSSELL CARL G | 7311 | COWETA | 19 | 5 |
| RUSSELL D MELOY OIL & GAS CO | 15798 | ENID | 52 | 18 |
| RUSSELL MINERALS INCActive | 23783 | NORMAN | 0 | 0 |
| RUSSELL OIL COMPANY | 6898 | HASKELL | 0 | 0 |
| RUSSELL OIL INC | 22123 | EDMOND | 0 | 0 |
| RUSSELL TODDActive | 24703 | TULSA | 1 | 1 |
| RUSSMARK ENERGY COMPANY | 11924 | OKLAHOMA CITY | 6 | 4 |
| RUST OIL CORPORATION | 11665 | FORT WORTH | 3 | 2 |
| RUSTLER ENERGY LLCActive | 24341 | LINDSAY | 2 | 1 |
| RUTH THELMA | 15579 | HENRYETTA | 0 | 0 |
| RW OIL & GAS LLCActive | 24063 | LAMONT | 3 | 2 |
| RWIT COMPANY INC | 1763 | TULSA | 4 | 3 |
| RY-CO PETROLEUMActive | 16952 | WANN | 20 | 1 |
| RYAN PETROLEUM CORP | 18148 | OKLAHOMA CITY | 2 | 1 |
| RYAN PETROLEUM OPERATING INC | 19083 | OKLAHOMA CITY | 3 | 2 |
| RYAN R ROBERTS CATTLE CO LLCActive | 24575 | SAND SPRINGS | 5 | 1 |
| RYLEE PETROLEUM INC | 15209 | DALLAS | 0 | 0 |
| S & B TRANSPORT LLC | 23663 | BUFFALO | 0 | 0 |
| S & C RESOURCES INCActive | 20764 | CLEVELAND | 9 | 2 |
| S & E INVESTMENT CO | 13521 | DEL CITY | 0 | 0 |
| S & F ENERGY LLCActive | 24408 | PONCA CITY | 5 | 1 |
| S & G OIL COMPANY | 14789 | VELMA | 1 | 1 |
| S & G OPERATING LLCActive | 19193 | MCLOUD | 17 | 8 |
| S & H TANK SERVICE INC | 13507 | LINDSAY | 0 | 0 |
| S & H TANK SERVICE INC DBA S & H TANK SERVICE OF OK | 23301 | — | 0 | 0 |
| S & H TANK SERVICE OF OKLAActive | 18010 | LINDSAY | 1 | 1 |
| S & J OIL COMPANY | 20298 | PONCA CITY | 0 | 0 |
| S & J OPERATING COMPANY | 5685 | WICHITA FALLS | 26 | 5 |
| S & J ROYALTY | 14672 | FT. SMITH | 0 | 0 |
| S & K OIL & GAS CORPORATION THE | 5976 | OKLAHOMA CITY | 0 | 0 |
| S & K OIL COMPANY | 1884 | TULSA | 11 | 5 |
| S & L OIL & GAS | 12623 | LAWTON | 1 | 1 |
| S & L RESOURCES INC | 14985 | LONGVIEW | 2 | 1 |
| S & M PRODUCTION INC | 15338 | PAWNEE | 3 | 1 |
| S & R RESOURCES INC | 18796 | SEMINOLE | 1 | 1 |
| S & S DISPOSAL SYSTEMS LLCActive | 21850 | BRISTOW | 1 | 1 |
| S & S ENERGY | 16531 | MOUNDS | 1 | 1 |
| S & S MORAVIA CO INC | 3527 | ALTUS | 0 | 0 |
| S & S OIL & GAS CORPORATION | 13760 | OKEMAH | 8 | 2 |
| S & S OIL & GAS LLC | 22645 | SKIATOOK | 0 | 0 |
| S & S OIL COMPANY | 15329 | YALE | 0 | 0 |
| S & S OIL COMPANY | 1885 | — | 0 | 0 |
| S & S OIL COMPANY | 2773 | MCALESTER | 0 | 0 |
| S & S OIL COMPANY | 8189 | LOCO | 0 | 0 |
| S & S OIL COMPANY INCActive | 1886 | Roanoke | 1 | 1 |
| S & S OIL OPERATORS | 12302 | ADA | 0 | 0 |
| S & S OIL PRODUCTIONS INCActive | 24322 | MORRIS | 66 | 3 |
| S & S OILFIELD SALES & SERVICE | 15469 | PONCA CITY | 0 | 0 |
| S & S OPERATIONS | 18023 | MIDWEST CITY OK | 2 | 2 |
| S & S PRODUCTION COMPANYActive | 10964 | ADDISON | 86 | 2 |
| S & S STAR OPERATING, LLCActive | 23996 | OKLAHOMA CITY | 104 | 15 |
| S & T OIL COMPANY | 10491 | CANEY | 0 | 0 |
| S & T SWD LLCActive | 22891 | CLINTON | 1 | 1 |
| S & V OIL CO INC | 10616 | SEMINOLE | 0 | 0 |