| 3101 | Oil Tech Producers Corporation | Moundridge, KS 67107 | Gas Operator | May 2026 |
| 3102 | Oil-Tech Prod Co | | Oil & Gas Operator | Oct 1992 |
| 3103 | Oilfield Search | | Oil Operator | Mar 1990 |
| 3104 | Oilfield Services, LLC | Winfield, KS 67156 | Oil Operator | Nov 2017 |
| 3105 | Oilfield Truck Service | | Oil Operator | Jun 2014 |
| 3106 | Oilwell Operator | | Gas Operator | Dec 1994 |
| 3107 | Oklahoma Energy & Exploration, Inc. | Tulsa, OK 74114 | Oil Operator | Jan 1996 |
| 3108 | Oklahoma Rig & Salvage Inc | Oklahoma City, OK 73114 | Oil & Gas Operator | Mar 2015 |
| 3109 | Okmar Oil Compan | | Oil & Gas Operator | Feb 1995 |
| 3110 | Okmar Oil Company | Marietta, OH 45750 | Oil & Gas Operator | Jun 2005 |
| 3111 | Okt Resources, LLC | Edmond, OK 73013 | Oil & Gas Operator | Sep 2026 |
| 3112 | Ol' Oily LLC | | Oil Operator | May 2026 |
| 3113 | Oleum Incorporat | | Gas Operator | Dec 1990 |
| 3114 | Olson D Producti | | Oil Operator | Jul 1994 |
| 3115 | Olson-Anderson Lease | | Oil Operator | Mar 2018 |
| 3116 | Olympic Oil, Inc. | Hutchinson, KS 67502 | Oil & Gas Operator | May 2026 |
| 3117 | Olympic Petroleu | | Oil & Gas Operator | Jul 1993 |
| 3118 | Omega Enterprise | | Oil Operator | Sep 1990 |
| 3119 | One Source Financial Services Inc. | McAllen, TX 78501 | Gas Operator | Dec 2019 |
| 3120 | Oneok Bushton Proces | | Gas Operator | Mar 2007 |
| 3121 | Oneok Energy Service | | Gas Operator | Dec 2008 |
| 3122 | Oneok Exploratio | | Oil & Gas Operator | Mar 1995 |
| 3123 | Oneok Field Services Company | Tulsa, OK 74103 | Oil & Gas Operator | Jan 2026 |
| 3124 | Oneok Gas Processing LLC | Tulsa, OK 74103 | Oil & Gas Operator | May 2018 |
| 3125 | Oneok Resources Company | Tulsa, OK 74102 | Oil & Gas Operator | Feb 2017 |
| 3126 | Onnen, Gerhard E. | Yates Center, KS 66783 | Oil Operator | Feb 2002 |
| 3127 | Onshore, L.L.C. | Wichita, KS 67205 | Oil & Gas Operator | Dec 2009 |
| 3128 | Onyxx Oil Corpor | | Oil Operator | Jul 1992 |
| 3129 | Oolite Energy Corp | Amarillo, TX 79105 | Oil & Gas Operator | Apr 2022 |
| 3130 | Opco LLC | Chase, KS 67524 | Oil Operator | Dec 2019 |
| 3131 | Opdycke Lease Partners, A General Partnership | Russell, KS 67665 | Oil Operator | May 2026 |
| 3132 | Opef Partnership, A General Partnership | Overland Park, KS 66221 | Oil Operator | Dec 2011 |
| 3133 | Orca Operating Company LLC | Houston, TX 77056 | Oil & Gas Operator | Jul 2026 |
| 3134 | Oryx Energy Comp | | Oil & Gas Operator | Apr 1991 |
| 3135 | Oryx Energy Company | Dallas, TX 75221 | Oil & Gas Operator | May 2002 |
| 3136 | Osage Energy, LLC | Colony, KS 66015 | Oil Operator | Nov 2025 |
| 3137 | Osage Resources, LLC | Wichita, KS 67202 | Oil & Gas Operator | May 2026 |
| 3138 | Osborn Energy, LLC | Bucyrus, KS 66013 | Oil & Gas Operator | Jul 2017 |
| 3139 | Osborn Heirs Com | | Oil & Gas Operator | May 1995 |
| 3140 | Osborn Heirs Company LTD | San Antonio, TX 78217 | Oil & Gas Operator | May 2026 |
| 3141 | Osborn Oil & Gas | | Oil & Gas Operator | Jun 1991 |
| 3142 | Osci Oil And Gas, Inc. | Parker, KS 66072 | Oil Operator | Jun 1998 |
| 3143 | Oswego Oil & Gas | | Oil & Gas Operator | Jun 1984 |
| 3144 | Outlaw Well Service LLC | Hays, KS 67601 | Oil Operator | May 2026 |
| 3145 | Overland Exploration Company | | Oil Operator | May 2026 |
| 3146 | Owen'S Pumping Service | | Oil Operator | May 2026 |
| 3147 | Owen, Matthew | Hamilton, KS 66853 | Oil Operator | Sep 2016 |
| 3148 | Owens Oil | | Oil Operator | Dec 2000 |
| 3149 | Owens Oil Company | Iowa Park, TX 76367 | Oil & Gas Operator | Sep 2008 |
| 3150 | Owens Oil Company, LLC | Yates Center, KS 66783 | Oil Operator | May 2026 |
| 3151 | Owens Petroleum | | Oil Operator | May 2006 |
| 3152 | Owens Petroleum LLC | Yates Center, KS 66783 | Oil & Gas Operator | May 2026 |
| 3153 | Owi Operating Co. LC | Ottawa, KS 66067 | Oil & Gas Operator | Dec 2009 |
| 3154 | Own Resources Operating LLC | The Woodlands, TX 77381 | Oil & Gas Operator | May 2026 |
| 3155 | Oxbow Oil Company,A Kansas General Partnership | Grenola, KS 67346 | Oil Operator | Apr 2015 |
| 3156 | Oxford Explorati | | Oil & Gas Operator | Mar 1993 |
| 3157 | Oxford Exploration | | Oil Operator | Apr 1988 |
| 3158 | Oxy USA | | Oil Operator | Apr 1992 |
| 3159 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Sep 2026 |
| 3160 | Ozark Enterprise | | Oil Operator | Nov 1990 |
| 3161 | P & C Petroleum, LLC | Shawnee, KS 66226 | Oil Operator | Feb 2026 |
| 3162 | P & M Energy, A General Partnership | Johnson, KS 67855 | Gas Operator | Sep 2003 |
| 3163 | P & M Oil Company | Hays, KS 67601 | Oil & Gas Operator | Dec 2025 |
| 3164 | P & M Petroleum | | Oil Operator | Mar 1998 |
| 3165 | P & M Petroleum Management LLC | Denver, CO 80202 | Oil & Gas Operator | Oct 2021 |
| 3166 | P & W Oil | Lakewood, CO 80215 | Oil Operator | Sep 1985 |
| 3167 | P J Oil Co. | | Oil Operator | May 2026 |
| 3168 | P.O.&G. Operating, LLC | Houston, TX 77057 | Oil & Gas Operator | Sep 2026 |
| 3169 | P3 Production | | Oil Operator | May 2026 |
| 3170 | Pacific Enterprises Oil Co USA | Dallas, TX 75201 | Oil & Gas Operator | Feb 2001 |
| 3171 | Packard Energy LLC | Medicine Lodge, KS 67104 | Oil & Gas Operator | May 2026 |
| 3172 | Packard Gas Company | Irving, TX 75063 | Oil & Gas Operator | Nov 2006 |
| 3173 | Packard, Lynn | Medicine Lodge, KS | Oil & Gas Operator | May 2026 |
| 3174 | Pada Petroleum, Inc. | Maple City, KS 67102 | Oil & Gas Operator | May 2026 |
| 3175 | Padgett Oil Inc. | Sedan, KS 67361 | Oil Operator | May 2006 |
| 3176 | Painter Oil Comp | | Oil & Gas Operator | Jul 1993 |
| 3177 | Palmer Engineering, Inc. | Luray, KS 67649 | Gas Operator | Mar 2000 |
| 3178 | Palmer Oil, Inc. | Garden City, KS 67846 | Oil & Gas Operator | May 2026 |
| 3179 | Palomino Petrole | | Oil & Gas Operator | Dec 1995 |
| 3180 | Palomino Petroleum | Newton, KS 67114 | Oil Operator | Oct 2003 |
| 3181 | Palomino Petroleum Inc | Newton, KS 67114 | Oil & Gas Operator | May 2026 |
| 3182 | Pan Western Energy Corporation | Tulsa, OK 74114 | Oil & Gas Operator | Sep 2026 |
| 3183 | Panaco, Inc. | Oklahoma City, OK 73102 | Oil & Gas Operator | May 2026 |
| 3184 | Panada Exploration, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Jun 1996 |
| 3185 | Pancanadian Petr | | Oil Operator | Aug 1990 |
| 3186 | Panhandle Easter | | Gas Operator | Dec 1986 |
| 3187 | Panhandle Petrol | | Oil Operator | Jun 1987 |
| 3188 | Pantera Energy Company | Amarillo, TX 79101 | Oil & Gas Operator | Sep 2026 |
| 3189 | Par Petroleum In | | Oil & Gas Operator | Jun 1993 |
| 3190 | Par Petroleum, Inc. | Liberal, KS 67901 | Gas Operator | Dec 2009 |
| 3191 | Par, Inc. | Oklahoma City, OK 73111 | Oil Operator | May 2016 |
| 3192 | Paradigm Energy LLC | Lenexa, KS 66227 | Oil & Gas Operator | Dec 2024 |
| 3193 | Paradise Creek Oil & Gas | Plainville, KS 67663 | Oil Operator | Dec 2025 |
| 3194 | Paramount Enterprises Inc | Hays, KS 67601 | Oil Operator | Aug 2000 |
| 3195 | Pardee Production Co. | Skiatook, OK 74070 | Oil & Gas Operator | Mar 2021 |
| 3196 | Parker & Parsley | | Oil & Gas Operator | Dec 1996 |
| 3197 | Parker & Parsley Development L.P | Midland, TX 79702 | Oil & Gas Operator | Oct 2007 |
| 3198 | Parker Trucking And Assoc. | Independence, MO 64052 | Oil Operator | Aug 1996 |
| 3199 | Parrish Corporat | | Oil & Gas Operator | Oct 1994 |
| 3200 | Parrish Corporation | Wichita, KS 67202 | Oil & Gas Operator | Jun 2002 |