| O A P LLC | 20092 | ADA | 0 | 0 |
| O G & E | 1609 | OKLAHOMA CITY | 0 | 0 |
| O G P OPERATING INCActive | 17901 | DALLAS | 108 | 6 |
| O I L ENERGY INC | 11266 | OKLAHOMA CITY | 13 | 7 |
| O K CRUDE | 23551 | MORRIS | 0 | 0 |
| O K SWABBING INC | 14745 | HENNESSEY | 63 | 15 |
| O M PROD & INVEST CORP | 14674 | OKLAHOMA CITY | 0 | 0 |
| O'BLUE CORP | 18220 | MIDLAND | 1 | 1 |
| O'BRIEN ENERGY RESOURCES CORPActive | 23035 | PORTSMOUTH | 12 | 4 |
| O'BRIEN OIL CORPORATIONActive | 22501 | GUTHRIE | 22 | 2 |
| O'BRIEN OIL LLC | 21961 | GUTHRIE | 1 | 1 |
| O'BRIEN RESOURCES LLC | 23124 | SHREVEPORT | 1 | 1 |
| O'CONNOR WM J | 1593 | OKLAHOMA CITY | 1 | 1 |
| O'DELL CHARLES F | 15629 | SHAWNEE | 0 | 0 |
| O'DELL DONALD E | 19968 | BROKEN ARROW | 2 | 1 |
| O'DONNELL BILL C | 3218 | TULSA | 7 | 3 |
| O'HAIR CARL OR CAROLE | 19713 | GAGE | 0 | 0 |
| O'HAIR DAN | 17536 | LAVERNE | 0 | 0 |
| O'HERN MORRIS D | 20151 | MOUNDS | 9 | 2 |
| O'JERICO INC | 14606 | TULSA | 0 | 0 |
| O'NEAL BILLY RAY | 21174 | KELLYVILLE | 0 | 0 |
| O'NEAL JERRYActive | 21451 | NOCONA | 3 | 1 |
| O'NEAL OIL & GAS COActive | 1622 | FORT WORTH | 248 | 6 |
| O'NEAL OIL COMPANYActive | 19521 | KINGSTON | 13 | 2 |
| O'NEILL LAWRENCE D | 15356 | S. COFFEYVILLE | 0 | 0 |
| O'NEILL PROPERTIES LTD | 6261 | MIDLAND | 17 | 5 |
| O'QUIN CHARLOTTE | 20677 | INOLA | 1 | 1 |
| O'SULLIVAN OIL & GAS CO INC | 20126 | HOUSTON | 0 | 0 |
| O.R.M. EXPLORATION COMPANY | 13063 | FORT WORTH | 0 | 0 |
| O7 SALTWATER DISPOSAL LLC | 23497 | MARIETTA | 2 | 1 |
| OAK CREEK OIL LLC | 23217 | BROKEN ARROW | 0 | 0 |
| OAK HILL PETROLEUM CORPORATIONActive | 11392 | OKLAHOMA CITY | 25 | 2 |
| OAK HILLS DRILLING & OPERATING LLC | 21702 | HOLDENVILLE | 1 | 1 |
| OAK HILLS ENERGY INC | 19911 | HOLDENVILLE | 5 | 2 |
| OAK RESOURCES INC | 16387 | TULSA | 0 | 0 |
| OAK RESOURCES INC | 18549 | TULSA | 0 | 0 |
| OAK ST OIL & GAS COMPANY | 16025 | PAULA VALLEY | 0 | 0 |
| OAK TREE NATURAL RES LLC | 19951 | OKLAHOMA CITY | 6 | 2 |
| OAK VALLEY SWD LLCActive | 23956 | ENID | 3 | 2 |
| OAKLAND PETROLEUM COMPANY INC | 6435 | TULSA | 0 | 0 |
| OAKLAND PETROLEUM OPERATING CO INCActive | 10179 | Tulsa | 328 | 9 |
| OAKLOOSA PETROLEUM CO INC | 17926 | TULSA | 0 | 0 |
| OAKWOOD RESOURCES INC | 8870 | DALLAS | 1 | 1 |
| OARE OIL FINDERS INC | 12901 | SAPULPA | 5 | 2 |
| OASIS & WITHROW OPERATING CO | 18013 | OKLAHOMA CITY | 2 | 1 |
| OASIS ENERGY RESOURCES LLCActive | 23680 | NORMAN | 1 | 1 |
| OASIS OPERATING LLC | 22111 | HOLDENVILLE | 1 | 1 |
| OASIS PETROLEUM CORP | 18120 | HOUSTON | 0 | 0 |
| OBELE OIL CORPORATION | 17463 | SEDONA | 3 | 2 |
| OBELE OPERATING COMPANY LLC | 21608 | SEDONA | 2 | 1 |
| OBERLANDER LESLIE A JAKE | 1590 | COVINGTON | 1 | 1 |
| OBLANDER LEON | 15154 | WOODWARD | 0 | 0 |
| OBSIDIAN ENERGY, LLCActive | 25273 | Norman | 0 | 0 |
| OCCIDENTAL PET CORP | 1591 | HOUSTON | 5 | 2 |
| OCCIPITAL OIL LLCActive | 24891 | STILLWATER | 1 | 1 |
| OCEANIC PETROLEUM EXPL CO | 8092 | LOS ANGELES | 2 | 1 |
| OCHILTREE OIL COMPANY | 18293 | EDMOND | 17 | 3 |
| OCHILTREE OIL COMPANY INC | 19119 | EDMOND | 4 | 3 |
| OCTAGON OIL | 12648 | MARLOW | 0 | 0 |
| OCTAGON RESOURCES LLC | 16242 | NORMAN | 5 | 5 |
| ODELL LARRY | 8039 | OOLOGAH | 2 | 1 |
| ODESSA OIL INVESTMENT CO INC | 17458 | ODESSA | 3 | 3 |
| ODOCO INC | 16172 | VELMA | 0 | 0 |
| ODUM RONALD LActive | 24844 | PONCA CITY | 4 | 1 |
| OELZE ELMER JR | 16963 | NASHVILLE | 1 | 1 |
| OENOKE OPERATING LLC | 24515 | OKLAHOMA CITY | 2 | 2 |
| OEX-1 LLC | 21164 | TULSA | 9 | 5 |
| OEXCO INC | 14006 | TULSA | 34 | 5 |
| OFFIELD LEASE OPERATIONS LLCActive | 21746 | WILSON | 1 | 1 |
| OFS-TULSA CORPORATION | 10372 | FORT WORTH | 11 | 6 |
| OGLE LEROY N | 6684 | TULSA | 0 | 0 |
| OGM RESOURCES LLC | 21148 | PERRYTON | 0 | 0 |
| OIL & GAS EXPERTS INC | 16606 | DALLAS | 0 | 0 |
| OIL & GAS EXPLORATION INC | 17918 | CLEVELAND | 2 | 1 |
| OIL & GAS PRODUCTION COMPANY | 14206 | TULSA | 0 | 0 |
| OIL AND GAS SUPPLY INC | 20136 | CUSHING | 1 | 1 |
| OIL BIZ INC | 17787 | NORMAN | 1 | 1 |
| OIL BROKERS TENNESSEE INC | 14100 | HOUSTON | 0 | 0 |
| OIL CAPITAL LAND AND EXPLORATION CO. | 11347 | TULSA | 2 | 2 |
| OIL CAPITAL OPERATING, LLCActive | 25141 | Tulsa | 25 | 3 |
| OIL CENTER OPERATING INC | 18344 | FORT WORTH | 28 | 6 |
| OIL CITY PETROLEUM INC | 16947 | TULSA | 0 | 0 |
| OIL CREEK PRODUCTION COMPANYActive | 11804 | PRAGUE | 29 | 5 |
| OIL EXPLORATION OF AMERICA INC | 7001 | SISSETON | 2 | 1 |
| OIL FIELD PRODUCTION INCActive | 24595 | Tulsa | 97 | 19 |
| OIL FUNDS MANAGEMENT INC | 7175 | HOUSTON | 0 | 0 |
| OIL GAS & ENERGY LLC | 23354 | COLLINSVILLE | 0 | 0 |
| OIL GITTER INC | 23471 | SHAFTER | 0 | 0 |
| OIL INVESTORS INC | 24169 | CRESCENT | 2 | 2 |
| OIL LIFT INC | 8147 | METAIRIE | 11 | 2 |
| OIL MINER, LLCActive | 24988 | PADEN | 3 | 2 |
| OIL PATCH ENERGY LLCActive | 12971 | Broken Arrow | 5 | 2 |
| OIL POOL INCActive | 22476 | TULSA | 10 | 1 |
| OIL PRODUCERS INC OF KANSASActive | 19447 | WICHITA | 51 | 11 |
| OIL PRODUCTION MANAGEMENT INC | 11053 | SQUAW VALLEY | 1 | 1 |
| OIL PRODUCTION SYSTEMS INC | 16053 | CUSHING | 37 | 8 |
| OIL PROPERTY MANAGEMENT INC | 1604 | WICHITA | 0 | 0 |
| OIL RECOVERY SYSTEMS INC | 23400 | TULSA | 28 | 9 |
| OIL ROX CORPORATION | 1606 | ADA | 0 | 0 |
| OIL STATE PETROLEUM INC | 10563 | JENNINGS | 10 | 4 |
| OILBANK PRODUCTION LLCActive | 24684 | NORMAN | 93 | 1 |
| OILBOND LIMITED | 14607 | TULSA | 0 | 0 |
| OILCO ENERGY INC | 13611 | DUNCAN | 3 | 2 |
| OILFIELD DISPOSAL SERVICES LLCActive | 22848 | WILSON | 3 | 1 |
| OILFIELD LEASING INC | 20389 | CUSHING | 4 | 2 |
| OILFIELD OPERATING COMPANY | 15852 | CUSHING | 104 | 10 |
| OILFIELD PIPE & SUPPLY INC | 15787 | BARTLESVILLE | 0 | 0 |
| OILROX RESOURCES LLC | 24446 | SAN ANTONIO | 1 | 1 |
| OILSEARCH CORPORATION | 12947 | ALBUQUERQUE | 15 | 5 |
| OILTEX INC | 13454 | AUSTIN | 0 | 0 |
| OILTON PETROLEUM INC | 6187 | OILTON | 5 | 2 |
| OILWELL FRACTURING SERVICE INC | 17279 | CUSHING | 0 | 0 |
| OILWELL OPERATORS INC | 15444 | PAMPA | 0 | 0 |
| OK OIL CO LLCActive | 24851 | MUSKOGEE | 1 | 1 |
| OK PRODUCTION SERVICES INC | 22419 | BROKEN ARROW | 0 | 0 |
| OK VAC-U-LIFT PROD COMPANY LLC | 19607 | BARTLESVILLE | 0 | 0 |
| OKAN GAS COMPANY LLC | 21570 | DEWEY | 1 | 1 |
| OKAN PRODUCTION INC | 17030 | TECUMSEH | 0 | 0 |
| OKANCO PETROLEUM CO INC | 7386 | WICHITA | 0 | 0 |
| OKC ENERGY CORPORATION | 10051 | OKLAHOMA CITY | 20 | 4 |
| OKCO OIL AND GAS CO INC | 8032 | COLLINSVILLE | 0 | 0 |
| OKFUSKEE PRODUCTION CO INC | 13026 | BURNEYVILLE | 0 | 0 |
| OKI OIL & GAS COMPANY | 16738 | COFFEYVILLE | 3 | 1 |
| OKIE CO | 17262 | CLAREMORE | 0 | 0 |
| OKIE CRUDE COMPANY | 15040 | TULSA | 0 | 0 |
| OKIE CRUDE COMPANY | 19434 | Tulsa | 0 | 0 |
| OKIE ENERGY COMPANY | 19302 | TULSA | 0 | 0 |
| OKIE OIL INC | 7355 | SAPULPA | 2 | 1 |
| OKIE PETROLEUM INC | 19540 | EDMOND | 0 | 0 |
| OKIE PETROLEUM SERVICES INC | 21865 | MUSTANG | 0 | 0 |
| OKKI ENERGY, LLCActive | 25245 | Oklahoma City | 0 | 0 |
| OKLA INDEPENDENT LEASING INC | 18589 | OKLAHOMA CITY | 0 | 0 |
| OKLA INNOVATIVE LEASING CORP | 13653 | CLAREMORE | 7 | 1 |
| OKLA SUB-SURFACE PUMP & SUPPLY COActive | 20033 | ADA | 3 | 1 |
| OKLAHOMA BASIC ECONOMY CORP | 3909 | HOUSTON | 19 | 5 |
| OKLAHOMA CELLULOSE INCActive | 21165 | CLEVELAND | 19 | 1 |
| OKLAHOMA CRAIG ENERGY ASSOC | 17783 | WELCH | 1 | 1 |
| OKLAHOMA CRUDE EXPL CORP | 11061 | BETHANY | 15 | 7 |
| OKLAHOMA CRUDE INCActive | 21405 | MORRIS | 49 | 2 |
| OKLAHOMA CRUDE PROCESSING LTD | 9000 | CRESCENT | 0 | 0 |
| OKLAHOMA DEV & ROYALTY INC | 15201 | TULSA | 29 | 8 |
| OKLAHOMA DEVELOPMENT CORP | 3630 | MUSKOGEE | 0 | 0 |
| OKLAHOMA DISPOSAL SYSTEM INC | 9049 | VELMA | 0 | 0 |
| OKLAHOMA ENERGY ACQUISITIONS LP | 23509 | HOUSTON | 50 | 3 |
| OKLAHOMA ENERGY EXCHANGE LLC | 22909 | DUNCAN | 0 | 0 |
| OKLAHOMA ENERGY LLC | 21364 | SKIATOOK | 0 | 0 |
| OKLAHOMA EQUIPMENT & SALVAGE | 17101 | OKLAHOMA CITY | 66 | 14 |
| OKLAHOMA EXPLORATION & PRODUCTION INC | 23155 | IRVING | 3 | 1 |
| OKLAHOMA GAS & OIL CORPORATIONActive | 8885 | OKEMAH | 5 | 2 |
| OKLAHOMA GEOLOGICAL SURVEY | 22326 | NORMAN | 1 | 1 |
| OKLAHOMA LAND & ENERGY COActive | 18682 | YUKON | 1 | 1 |
| OKLAHOMA LIQUID RESOURCES INCActive | 12548 | COLLINSVILLE | 20 | 8 |
| OKLAHOMA NATURAL RESOURCES INC | 14049 | WOODWARD | 117 | 33 |
| OKLAHOMA O & G ROYALTIES INC | 7921 | DUNCAN | 7 | 4 |
| OKLAHOMA OIL & GAS MGMT INC | 17016 | EDMOND | 50 | 18 |
| OKLAHOMA OIL & GAS MINERAL BUYERS, LLCActive | 25157 | EDMOND | 4 | 1 |
| OKLAHOMA OIL & ROYALTY CO INC | 18969 | KAW CITY | 1 | 1 |
| OKLAHOMA OIL AND GAS RESOURCES LLCActive | 24585 | GUTHRIE | 29 | 8 |
| OKLAHOMA OIL COMPANY | 5494 | DALLAS | 3 | 3 |
| OKLAHOMA OIL OPERATORS INC | 17587 | BIXBY | 0 | 0 |
| OKLAHOMA OIL TACTICS INC | 18889 | EDMOND | 88 | 20 |
| OKLAHOMA OILFIELD SOLUTIONS LLCActive | 24686 | WAGONER | 26 | 2 |
| OKLAHOMA PETRO CONSULTNTS INC | 12855 | TULSA | 4 | 2 |
| OKLAHOMA PETROLEUM INC | 21530 | DES MOINES | 2 | 1 |
| OKLAHOMA PETROLEUM MGMT CORP | 7237 | TULSA | 3 | 2 |
| OKLAHOMA PRIME ENERGY LLC | 23208 | ARDMORE | 59 | 9 |
| OKLAHOMA PROD & EXP CO | 17854 | BROKEN ARROW | 0 | 0 |
| OKLAHOMA PRODUCED WATER SOLUTIONS LLC | 24285 | HOUSTON | 1 | 1 |
| OKLAHOMA RESOURCE MANAGEMENT | 15228 | ENID | 1 | 1 |
| OKLAHOMA RIG & SALVAGE INC | 16996 | OKLAHOMA CITY | 23 | 9 |
| OKLAHOMA SILURIAN PARTNERS | 13460 | TULSA | 6 | 6 |
| OKLAHOMA SWD 1 LLC | 24079 | OKLAHOMA CITY | 0 | 0 |
| OKLAHOMA SWD SYSTEMS INCActive | 22240 | ODESSA | 3 | 2 |
| OKLAHOMA TANK SERVICE INC | 9206 | OKLAHOMA CITY | 0 | 0 |
| OKLAND DEVELOPMENT CORP | 12299 | TULSA | 11 | 4 |
| OKLAND OIL COMPANYActive | 7910 | OKLAHOMA CITY | 150 | 23 |
| OKLAND OPERATING COMPANY | 16897 | OKLAHOMA CITY | 0 | 0 |
| OKLAOLEUM OIL AND GAS INCActive | 21759 | BRISTOW | 5 | 1 |
| OKMAR OIL COMPANY | 1615 | MARIETTA | 11 | 5 |
| OKT PETROLEUM COMPANY INC | 12877 | OKLAHOMA CITY | 30 | 12 |
| OKTEX OPERATING LLC | 21343 | EDMOND | 2 | 2 |
| OKY INVESTMENTS INC | 21933 | EDMOND | 5 | 4 |
| OLAP OPERATING COMPANY LLC | 22986 | EDMOND | 16 | 1 |
| OLD DOMINION EXPLORATION CO | 15462 | OKLAHOMA CITY | 32 | 13 |
| OLD DOMINION OIL CORPORATION | 8728 | OKLAHOMA CITY | 2 | 2 |
| OLD LINE PRODUCTION CO | 13008 | TULSA | 2 | 1 |
| OLD PUEBLO OIL CORP | 8364 | TUCSON | 9 | 3 |
| OLD WEST OIL & GAS INC | 19978 | CANOGA PARK | 0 | 0 |
| OLD YORK DRILLING CO INC | 13190 | NEW YORK | 5 | 1 |
| OLE CROW OPERATINGActive | 17108 | WICHITA FALLS | 175 | 4 |
| OLE DAVE OIL COMPANY | 16181 | ENID | 0 | 0 |
| OLIA OIL & GAS SERVICES LLC | 24075 | CEDAR PARK | 74 | 1 |
| OLIPHANT GERTRUD | 2661 | HOLDENVILLE | 12 | 2 |
| OLIVE OIL & GAS INCActive | 13187 | JENNINGS | 6 | 1 |
| OLSEN FRED INC | 7132 | HOUSTON | 0 | 0 |
| OLSON CLINT AND MISTYActive | 24424 | COUNCIL HIL | 7 | 1 |
| OLYMPIA ENERGY CORP | 15322 | OKLAHOMA CITY | 0 | 0 |
| OLYMPIA OIL INC | 22072 | EDMOND | 7 | 4 |
| OLYMPIC ENTERPRISES INC | 14900 | YUKON | 13 | 3 |
| OLYMPIC OIL & GAS INC | 11594 | OKLAHOMA CITY | 11 | 3 |