| OLYMPIC PETROLEUM CO | 1621 | TULSA | 6 | 3 |
| OM OPERATING LLC | 24509 | HOUSTON | 0 | 0 |
| OMEGA CENTRAL A OKLA PRTNSHP | 12119 | TULSA | 4 | 1 |
| OMEGA ENERGY | 13869 | PAMPA | 2 | 2 |
| OMEGA ENERGY LLC | 20883 | HASKELL | 2 | 1 |
| OMEGA MID-CONTINENT, LLCActive | 25025 | Fort Collins | 6 | 1 |
| OMIMEX INTERNATIONAL CORP | 16809 | FORT WORTH | 4 | 1 |
| OMIMEX PETROLEUM INC | 22429 | FORT WORTH | 3 | 1 |
| OMNI EXPLORATION INC | 16221 | COLUMBUS | 0 | 0 |
| OMNI OIL & GAS INC | 7688 | EDMOND | 3 | 2 |
| OMOCO INC | 13042 | BROKEN ARROW | 11 | 2 |
| OMRANCO OPERATING | 16883 | AGOURA | 0 | 0 |
| OMU ENERGY LLCActive | 25077 | Bristow | 73 | 12 |
| ON BENT KNEE LLC | 23136 | SASAKWA | 0 | 0 |
| ON-LINE OIL INC | 18574 | OKLAHOMA CITY | 81 | 1 |
| ONAPA GAS COMPANY LLC | 22700 | TULSA | 0 | 0 |
| ONEAL LINDELL | 5504 | NOCONA | 7 | 4 |
| ONEOK EXPLORATION COMPANY | 5324 | TULSA | 19 | 12 |
| ONEOK FIELD SERVICES COMPANY | 20618 | TULSA | 0 | 0 |
| ONEOK GAS PROCESSING LLC | 21373 | TULSA | 0 | 0 |
| ONEOK GAS STORAGE LLC | 20643 | TULSA | 3 | 2 |
| ONEOK GAS TRANSPORTATION COActive | 1610 | TULSA | 54 | 15 |
| ONEOK GAS TRANSPORTATION LLCActive | 24544 | TULSA | 64 | 4 |
| ONEOK HYDROCARBON LPActive | 21099 | TULSA | 32 | 1 |
| ONEOK RESOURCES COMPANY | 12420 | TULSA | 84 | 26 |
| ONG SAYRE STORAGE COMPANY | 2643 | TULSA | 0 | 0 |
| ONPOINT OIL & GAS, LLCActive | 24218 | OKLAHOMA CITY | 59 | 2 |
| ONSHORE ENERGY CORPORATION INC | 20473 | PHOENIX | 12 | 1 |
| ONSHORE ROYALTIES LLCActive | 23326 | Houston | 70 | 7 |
| ONYX ENERGY CORPORATION | 10134 | OKLAHOMA CITY | 21 | 10 |
| ONYX ENERGY GROUP LLCActive | 22866 | TULSA | 13 | 2 |
| ONYX OILFIELD SERVICES LLC | 23319 | ROFF | 0 | 0 |
| ONYX PROPERTIES CORP | 17137 | OKLAHOMA CITY | 1 | 1 |
| ONYX RESOURCES INC | 18500 | ALLEN | 0 | 0 |
| OPAL OPERATING COMPANY LLCActive | 24474 | Edmond | 23 | 8 |
| OPEC CRUDE INC | 13009 | TULSA | 0 | 0 |
| OPEN BEACHES LLC | 23478 | FAIRVIEW | 3 | 1 |
| OPEN DOOR HOLDINGS INCActive | 20726 | SURPRISE | 2 | 2 |
| OPEN DOOR PRODUCTIONS INC | 20426 | MUSKOGEE | 3 | 1 |
| OPEN RANGE ENERGY LLCActive | 24480 | JONES | 1 | 1 |
| OPERATING SERVICE INC | 16722 | YUKON | 0 | 0 |
| OPEX INC | 16787 | ADAIR | 6 | 1 |
| OPS GROUP LP | 22926 | HOUSTON | 0 | 0 |
| OPTIMA EXPLORATION LLC | 22699 | TULSA | 4 | 2 |
| OPTIMA OIL & GAS COMPANY LLC | 21012 | OKLAHOMA CITY | 0 | 0 |
| OPTIMAL OPERATING LLCActive | 25133 | Tulsa | 2 | 1 |
| OPUBCO RESOURCES OF TX INC | 1751 | DALLAS | 4 | 4 |
| ORACLE RESOURCES OKLAHOMA LP | 21726 | DALLAS | 1 | 1 |
| ORASON RESOURCES INC | 12876 | TULSA | 52 | 8 |
| ORCA OPERATING COMPANY LLCActive | 22354 | TULSA | 58 | 9 |
| OREN STONEActive | 18569 | ERICK | 8 | 3 |
| ORINOCO OIL COMPANY INC | 14101 | FORT WORTH | 0 | 0 |
| ORION EXPLORATION LLC | 22221 | TULSA | 3 | 1 |
| ORION EXPLORATION PARTNERS LLC | 22841 | TULSA | 0 | 0 |
| ORION OIL CO | 20280 | CLEVELAND | 0 | 0 |
| ORION PRODUCTION CO | 13162 | DALLAS | 1 | 1 |
| ORLOSKI JOHN CActive | 15347 | BARTLESVILLE | 6 | 1 |
| ORLOSKI STANLEY J | 5789 | BARTLESVILLE | 0 | 0 |
| OROZCO ENERGY LLC | 23450 | KINGFISHER | 0 | 0 |
| ORS CORPORATION | 15649 | TULSA | 0 | 0 |
| ORTEGA ENERGY LLC | 23091 | HENNESSEY | 0 | 0 |
| OSA OIL & GAS LLC | 22784 | TULSA | 0 | 0 |
| OSAGE ENERGY RESOURCES LLC | 22336 | BARTLESVILLE | 4 | 1 |
| OSAGE EXPLORATION & DEVELOPMENT INC | 23098 | SAN DIEGO | 5 | 2 |
| OSAGE LAND & CATTLE CO | 11118 | TULSA | 1 | 1 |
| OSAGE OIL & TRANSPORTATION INC | 1628 | CLEVELAND | 1 | 1 |
| OSAGE PETROLEUM CORPORATION | 20682 | SAINT LOUIS | 2 | 1 |
| OSAGE SAWDUST OIL COMPANY | 15144 | PAWHUSKA | 0 | 0 |
| OSBORN HEIRS COMPANY | 1629 | SAN ANTONIO | 53 | 19 |
| OSBORN W B OIL & GAS OPERTION | 13451 | SAN ANTONIO | 8 | 3 |
| OSBORN W JActive | 22449 | HOLDENVILLE | 1 | 1 |
| OSBURN GERALD dba OZZY & SON OIL & GAS | 21519 | DRUMRIGHT | 5 | 1 |
| OSCAR'S WELL SERVICE INC | 17274 | OKEMAH | 1 | 1 |
| OSCEOLA ENERGY COActive | 25165 | DENTON | 25 | 2 |
| OSHTAH OIL COMPANY LLC | 18625 | STRATFORD | 29 | 2 |
| OSMOND EVERT LYNDELActive | 24725 | FARGO | 1 | 1 |
| OSMOND SR EVERT LELAND | 12595 | FARGO | 0 | 0 |
| OSO RESOURCES LLCActive | 24580 | Edmond | 58 | 3 |
| OSTERBY HAZEL NADINE | 5774 | SPERRY | 1 | 1 |
| OSTERHOUT PHILLIP L | 15064 | DRUMRIGHT | 6 | 3 |
| OSWEGO ARBUCKLE ENTERPRISE INC | 8457 | S COFFEYVILLE | 2 | 2 |
| OTC PETROLEUM CORPORATION | 17331 | OKLAHOMA CITY | 17 | 10 |
| OUACHITA EXPLORATION INCActive | 5960 | CHICKASHA | 92 | 3 |
| OUTBACK PETROLEUM INC | 18767 | MOORE | 6 | 2 |
| OUTLAW OIL & GAS LLCActive | 24552 | KAW CITY | 7 | 4 |
| OUTWEST OIL & GAS INC | 21646 | GARLAND | 0 | 0 |
| OVATION ENERGY II LP | 21703 | HOUSTON | 1 | 1 |
| OVATION ENERGY LP | 21105 | N RICHLAND HILL | 0 | 0 |
| OVER THE TOP LLC | 21877 | EDMOND | 0 | 0 |
| OVERFLOW ENERGY LLCActive | 22383 | PERRYTON | 63 | 15 |
| OVERFLOW ENERGY STACK LLC | 24235 | BOOKER | 11 | 5 |
| OVERLAND INVESTMENTS INCActive | 22466 | COWETA | 32 | 3 |
| OVERSTREET C A INC | 12896 | YUKON | 2 | 1 |
| OVERSTREET OPERATING COMPANY | 18565 | GARDEN CITY | 0 | 0 |
| OVERTON ED TRUST #2 | 19128 | BEAVER | 0 | 0 |
| OVINTIV MID-CONTINENT INC. | 20944 | THE WOODLANDS | 276 | 30 |
| OVINTIV USA INCActive | 21713 | THE WOODLANDS | 309 | 15 |
| OWE ENERGY INC | 14681 | CHESTER | 0 | 0 |
| OWENS JAMES WActive | 5469 | TULSA | 14 | 1 |
| OWENS LEON E | 17823 | BARTLESVILLE | 0 | 0 |
| OWENS ROBERT G INC | 14746 | EDMOND | 0 | 0 |
| OWL CREEK PRODUCTION CO INC | 19823 | HOUSTON | 10 | 1 |
| OWL OPERATING LLCActive | 25208 | Skiatook | 5 | 1 |
| OXFORD EXPLORATION COMPANY | 16329 | DENVER | 0 | 0 |
| OXFORD OIL INC | 12433 | CLEVELAND | 4 | 1 |
| OXLEY ENERGY LLCActive | 24290 | HOUSTON | 174 | 5 |
| OXLEY JOHN C | 2503 | TULSA | 0 | 0 |
| OXLEY JOHN C LLC | 21495 | OKLAHOMA CITY | 0 | 0 |
| OXLEY PETROLEUM | 3492 | TULSA | 88 | 14 |
| OXLEY PETROLEUM COMPANY | 20154 | OKLAHOMA CITY | 50 | 11 |
| OXLOW ENERGY CORP | 13755 | OKLAHOMA CITY | 1 | 1 |
| OXTEX INC | 11830 | HOUSTON | 0 | 0 |
| OXXFORD ENERGY CORP | 16521 | HOUSTON | 0 | 0 |
| OXY USA INC | 9012 | HOUSTON | 970 | 49 |
| OZARK OIL CORPORATION | 11401 | SPRINGFIELD | 2 | 1 |
| OZARK-MAHONING COMPANY | 2961 | TULSA | 4 | 2 |
| P & B CORPORATION LLC | 20457 | EDMOND | 0 | 0 |
| P & C EQUIPMENT CORPORATION | 5502 | OKLAHOMA CITY | 0 | 0 |
| P & C OIL CO | 17159 | HOLDENVILLE | 0 | 0 |
| P & F INVESTMENTS | 13794 | OKLAHOMA CITY | 0 | 0 |
| P & H CONSTRUCTION INCActive | 17558 | Wewoka | 4 | 2 |
| P & H OIL & GAS INCActive | 18769 | STROUD | 77 | 2 |
| P & M DRILLING COMPANY INC | 8324 | DEPEW | 1 | 1 |
| P & M PETROLEUM MANAGEMENT | 16073 | DENVER | 1 | 1 |
| P & P CEMENTING LLC | 21367 | NOWATA | 7 | 2 |
| P & P PRODUCING INC | 19388 | MIDLAND | 1 | 1 |
| P & S OIL & GAS INC | 15849 | TULSA | 0 | 0 |
| P & W DISPOSAL | 15791 | HENNESSEY | 0 | 0 |
| P & W OIL | 12586 | PAULS VALLEY | 1 | 1 |
| P A ENERGY INC | 19035 | CALVIN | 4 | 1 |
| P B M PRODUCTION INC | 15391 | MUSKOGEE | 1 | 1 |
| P F BEELER LLCActive | 20594 | NORMAN | 4 | 1 |
| P K & L OIL PROPERTIES | 19152 | SHAWNEE | 1 | 1 |
| P M C | 14696 | DALLAS | 0 | 0 |
| P O & G PANHANDLE LPActive | 24342 | HOUSTON | 178 | 2 |
| P P & K DRILLING INC | 17621 | MARLOW | 0 | 0 |
| P T OIL CO INC | 5991 | WALTERS | 3 | 1 |
| P'BELL ENERGY COMPANY | 19538 | OKLAHOMA CITY | 0 | 0 |
| P-2 EXPLORATON CO INC | 17103 | PAMPA | 1 | 1 |
| P.O.&G. OPERATING LLCActive | 23558 | HOUSTON | 350 | 15 |
| P3 OIL & GAS LLCActive | 22685 | WANN | 5 | 1 |
| P4 LLC | 21947 | WANN | 0 | 0 |
| PA-BEC INC | 12817 | HENNESSEY | 0 | 0 |
| PABLO ENERGY II LLCActive | 21896 | AMARILLO | 48 | 4 |
| PABLO ENERGY INC | 21851 | AMARILLO | 0 | 0 |
| PAC-OK PETROLEUM CORPORATION | 12449 | MANNFORD | 6 | 3 |
| PACE EXPLORATION LLCActive | 20055 | TULSA | 18 | 8 |
| PACE RESOURCES INC | 4707 | OKLAHOMA CITY | 3 | 1 |
| PACESETTER RESOURCES INC | 11855 | OKLAHOMA CITY | 1 | 1 |
| PACIFIC ENTERPRISE OIL CO USA | 4296 | LOS ANGELES | 33 | 18 |
| PACIFIC ENTERPRISES OIL CO | 2693 | OKLAHOMA CITY | 0 | 0 |
| PACIFIC ENTERPRISES ROYALTY CO | 7465 | OKLAHOMA CITY | 45 | 15 |
| PACIFIC MIDWEST GAS COMPANY | 14818 | TULSA | 0 | 0 |
| PACIFIC RESOURCES INC | 12276 | CUSHING | 9 | 4 |
| PACIFICA ENERGIES LTD | 8029 | TULSA | 8 | 2 |
| PACKSADDLE OIL COMPANY INC | 20555 | ARNETT | 0 | 0 |
| PACO PETROLEUM INC | 17958 | AMARILLO | 0 | 0 |
| PACTOLA DEVELOPMENT CO | 17505 | TULSA | 1 | 1 |
| PAERTREE, INC.Active | 25215 | OKLAHOMA CITY | 0 | 0 |
| PAGE PETROLEUM INC | 10734 | CALGARY | 0 | 0 |
| PAGE PETROLEUM INC | 14799 | CALGARY | 0 | 0 |
| PAGE PETROLEUM OF COLORADO | 14700 | CALGARY | 0 | 0 |
| PAINTER & MCPHAIL | 4785 | BARTLESVILLE | 75 | 3 |
| PAK ENERGY LLC | 24034 | CALGARY | 0 | 0 |
| PAKJEM CORPORATION | 15810 | TULSA | 0 | 0 |
| PAL ENERGY LLC | 19819 | GUYMON | 1 | 1 |
| PAL KIDS INC | 12001 | CORONADO | 4 | 3 |
| PALADIN OIL & GAS INC | 11613 | OKLAHOMA CITY | 1 | 1 |
| PALADIN OPERATING COMPANY, LLC | 25014 | Denver | 0 | 0 |
| PALEO INCActive | 6972 | Oklahoma City | 36 | 15 |
| PALISADES ASSET HOLDING CO LLC | 20633 | MIDLAND | 0 | 0 |
| PALISADES ASSET HOLDING CO LLCActive | 20932 | MIDLAND | 0 | 0 |
| PALM DRILLING PARTNERS LLC | 21004 | OKLAHOMA CITY | 0 | 0 |
| PALM OIL & GAS COMPANYActive | 15874 | SEDONA | 124 | 6 |
| PALM OPERATING LLC | 22467 | OKLAHOMA CITY | 87 | 4 |
| PALMER LAND COMPANY LTD | 14281 | OKEMAH | 0 | 0 |
| PALMER MIKE SR | 21576 | ADA | 0 | 0 |
| PALMER PETROLEUM INC | 23779 | SHREVEPORT | 0 | 0 |
| PALMER RANCH | 19141 | STIGLER | 0 | 0 |
| PALMETTO OIL & GAS LLC | 24119 | LEXINGTON | 0 | 0 |
| PALOMA OPERATING CO INC | 23932 | HOUSTON | 12 | 4 |
| PALOMA RESOURCES LLC | 23874 | HOUSTON | 0 | 0 |
| PALOMINO PETROLEUM CO LLC | 20047 | TULSA | 1 | 1 |
| PALOMINO PETROLEUM INCActive | 23946 | NEWTON | 23 | 3 |
| PALUCA PETROLEUM INCActive | 19544 | HOLDENVILLE | 323 | 11 |
| PALUXY RESOURCES INC | 17173 | HICO | 0 | 0 |
| PAM OIL COMPANY | 5013 | BLACKWELL | 17 | 1 |
| PAMAVETTA OIL CO | 1639 | EXETER | 0 | 0 |
| PAN AMERICAN LIQUIDS SERVICE CO INC | 21710 | COWETA | 0 | 0 |
| PAN PETROLEUM MLP | 17613 | KANSAS CITY | 7 | 1 |
| PAN TEXAS PETROLEUM INC | 8338 | FORT WORTH | 1 | 1 |
| PAN WESTERN ENERGY CORPORATION | 11303 | TULSA | 15 | 11 |
| PANADA EXPLORATION INC | 17672 | TULSA | 2 | 2 |
| PANADERO OIL COMPANY | 16976 | DALLAS | 10 | 2 |
| PANAMERICAN OPERATING INC | 21809 | DALLAS | 1 | 1 |
| PANENERGY SERVICES INC | 61 | HOUSTON | 286 | 29 |
| PANEXCO OPERATING LLC | 22096 | OKLAHOMA CITY | 14 | 2 |
| PANGAEA EXPLORATION CORPActive | 20103 | EDMOND | 16 | 3 |
| PANHANDLE EASTERN PIPELINE COMPANY LPActive | 1641 | HOUSTON | 20 | 1 |
| PANHANDLE OIL & GAS CONSULTANTS INC | 13471 | WOODWARD | 22 | 9 |