| 201 | National Petroleum Reserves, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Apr 2012 |
| 202 | New Horizon Resources LLC | Houston, TX 77057 | Oil & Gas Operator | Dec 2025 |
| 203 | Northern Gas Pro | | Gas Operator | Jun 1994 |
| 204 | Northstar Investments, Inc. | Wichita, KS 67230 | Oil & Gas Operator | Sep 2025 |
| 205 | Oil Producers In | | Oil & Gas Operator | Dec 1996 |
| 206 | Oil Producers, Inc. Of Kansas | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 207 | Oil Property Man | | Oil & Gas Operator | Jun 1995 |
| 208 | Oneok Energy Service | | Gas Operator | Dec 2008 |
| 209 | Oneok Exploratio | | Oil & Gas Operator | Mar 1995 |
| 210 | Oneok Resources Company | Tulsa, OK 74102 | Oil & Gas Operator | Feb 2017 |
| 211 | Osborn Heirs Company LTD | San Antonio, TX 78217 | Oil & Gas Operator | Sep 2025 |
| 212 | Outback Oil, Inc. | Pratt, KS 67124 | Gas Operator | Sep 2019 |
| 213 | Oxy USA Inc | Houston, TX 77046 | Oil & Gas Operator | Dec 2025 |
| 214 | Palomino Petrole | | Oil & Gas Operator | Dec 1995 |
| 215 | Palomino Petroleum Inc | Newton, KS 67114 | Oil & Gas Operator | Sep 2025 |
| 216 | Par Petroleum In | | Oil & Gas Operator | Jun 1993 |
| 217 | Patton Oil Compa | | Oil & Gas Operator | Nov 1994 |
| 218 | Petrie Enterpris | | Oil & Gas Operator | Sep 1986 |
| 219 | Petrie, Stanley D. | Pratt, KS 67124 | Gas Operator | Aug 1995 |
| 220 | Petro Locators I | | Oil & Gas Operator | Dec 1995 |
| 221 | Petroleum Manage | | Oil & Gas Operator | Oct 1994 |
| 222 | Petroleum Property Services, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Sep 2025 |
| 223 | Phillips Petrole | | Oil & Gas Operator | May 1995 |
| 224 | Pickrell Drilling Co., Inc. | Wichita, KS 67213 | Oil & Gas Operator | Sep 2025 |
| 225 | Pintail Petroleu | | Oil & Gas Operator | Dec 1995 |
| 226 | Pintail Petroleum, LTD. | Wichita, KS 67202 | Oil & Gas Operator | Apr 2021 |
| 227 | Plains Petroleum | | Gas Operator | Dec 1996 |
| 228 | Plains Petroleum Operating Co | Denver, CO 80202 | Oil & Gas Operator | Dec 2014 |
| 229 | Plainsco, LTD. | Denver, CO 80203 | Oil & Gas Operator | Jan 2002 |
| 230 | Plano Petroleum | | Oil & Gas Operator | Dec 1994 |
| 231 | Plano Petroleum Corporation | McKinney, TX 75070 | Oil & Gas Operator | Sep 2025 |
| 232 | Ponderosa Witching, LLC | Waco, TX 76705 | Oil Operator | Sep 2025 |
| 233 | Prafford Gas System, LC | Wichita, KS 67201 | Gas Operator | May 2012 |
| 234 | Prater Oil & Gas Operations, Inc. | Pratt, KS 67124 | Oil & Gas Operator | Sep 2025 |
| 235 | Prater Ronald Ru | | Gas Operator | Mar 1989 |
| 236 | Pratt Well Servi | | Oil & Gas Operator | Jul 1996 |
| 237 | Pratt Well Service, Inc. | Pratt, KS 67124 | Oil & Gas Operator | Sep 2025 |
| 238 | Pride Energy Company, A General Partnership | Tulsa, OK 74170 | Oil & Gas Operator | Aug 2021 |
| 239 | Prisum Ventures | | Oil & Gas Operator | Oct 1995 |
| 240 | Ram Petroleum Co | | Oil & Gas Operator | Sep 1983 |
| 241 | Rama Operating C | | Oil & Gas Operator | Dec 1996 |
| 242 | Rama Operating Company Inc | Stafford, KS 67578 | Oil & Gas Operator | Nov 2025 |
| 243 | Range Oil Co., Inc. | Wichita, KS 67278 | Oil & Gas Operator | Jan 2020 |
| 244 | Raymond Oil Co I | | Gas Operator | Sep 1993 |
| 245 | Raymond Oil Co., Inc. | Wichita, KS 67201 | Oil & Gas Operator | Sep 2025 |
| 246 | Raymond Oil Comp | | Oil & Gas Operator | Dec 1996 |
| 247 | Reach Petroleum | | Oil & Gas Operator | Jan 1994 |
| 248 | Redboot Production, Inc | Stafford, KS 67578 | Gas Operator | Jan 2017 |
| 249 | Reh Oil And Gas, LLC. | Pratt, KS 67124 | Oil & Gas Operator | Apr 2019 |
| 250 | Resource Venture | | Oil & Gas Operator | Oct 1991 |
| 251 | Richardson J Mar | | Oil & Gas Operator | Apr 1995 |
| 252 | Richardson Oil | | Oil & Gas Operator | Dec 2019 |
| 253 | Rine Drilling Co | | Oil & Gas Operator | Mar 1994 |
| 254 | Ritchie Explorat | | Oil & Gas Operator | Dec 1996 |
| 255 | Ritchie Exploration, Inc. | Wichita, KS 67278 | Oil & Gas Operator | Sep 2025 |
| 256 | Robert-Gay Energ | | Oil & Gas Operator | Jun 1992 |
| 257 | Robert-Gay Energy Enterprises | Hutchinson, KS 67501 | Oil Operator | Nov 1999 |
| 258 | Robinson Energy & Exploration, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Aug 2008 |
| 259 | Robinson Oil Com | | Oil & Gas Operator | Feb 1995 |
| 260 | Ronald Russ Prater, Inc. | Eastborough, KS 67207 | Gas Operator | Nov 2024 |
| 261 | Royal Drilling Inc | Russell, KS 67665 | Oil Operator | Sep 2025 |
| 262 | Rupe Oil Company Inc | Wichita, KS 67278 | Oil & Gas Operator | Sep 2025 |
| 263 | S & K Oil Compan | | Oil Operator | Sep 1989 |
| 264 | Sagebrush Operating LLC | Denver, CO 80203 | Oil & Gas Operator | Aug 2025 |
| 265 | Seagull Operatin | | Oil & Gas Operator | Jul 1995 |
| 266 | Servco Productio | | Oil Operator | Dec 1992 |
| 267 | SH Oil Operations LLC | Wichita, KS 67277 | Oil & Gas Operator | Sep 2025 |
| 268 | Sharp Engineerin | | Oil Operator | Aug 1995 |
| 269 | Shelby Resources LLC | Denver, CO 80207 | Oil & Gas Operator | Sep 2025 |
| 270 | Siroky Oil Management | Pratt, KS 67124 | Oil & Gas Operator | Sep 2025 |
| 271 | Southwind Consulting | Pratt, KS 67124 | Oil Operator | Oct 1997 |
| 272 | Spines Explorati | | Oil & Gas Operator | Dec 1990 |
| 273 | Sterling Petrole | | Oil & Gas Operator | Sep 1992 |
| 274 | Stoeppelwerth DR | | Oil Operator | May 1993 |
| 275 | Studer Oil Co. | Pratt, KS 67124 | Oil Operator | Oct 2019 |
| 276 | Studer Oil Compa | | Oil & Gas Operator | Feb 1993 |
| 277 | Sunwest Explorat | | Oil & Gas Operator | Nov 1985 |
| 278 | Supernova Energy, Inc. | Wichita, KS 67226 | Oil & Gas Operator | Nov 2019 |
| 279 | T G T Petroleum Corporation | Wichita, KS 67275 | Oil & Gas Operator | Sep 2025 |
| 280 | Tenneco Oil Comp | | Oil & Gas Operator | Aug 1995 |
| 281 | Texaco Explorati | | Oil & Gas Operator | Dec 1996 |
| 282 | Texaco Exploration & Prod Inc | Houston, TX 77236 | Oil & Gas Operator | Sep 2025 |
| 283 | Texas Energies I | | Oil & Gas Operator | Aug 1994 |
| 284 | Texas Energies Inc | Pratt, KS 67124 | Oil & Gas Operator | Aug 1998 |
| 285 | TGT Petroleum Co | | Oil & Gas Operator | Apr 1995 |
| 286 | Thomas Garner, Inc. | St John, KS 67576 | Oil & Gas Operator | Sep 2025 |
| 287 | Thoroughbred Associates LLC | Wichita, KS 67226 | Oil & Gas Operator | Sep 2025 |
| 288 | Timberline Oil & | | Oil & Gas Operator | Jul 1995 |
| 289 | Timberline Oil & Gas | | Oil & Gas Operator | Sep 1995 |
| 290 | Timberline Oil & Gas Corporation | Rapid City, SD 57702 | Oil & Gas Operator | Sep 2025 |
| 291 | Tko Investments, Inc. | Dodge City, KS 67801 | Oil & Gas Operator | Sep 2025 |
| 292 | TPC, Inc. | Manhattan, KS 66502 | Oil & Gas Operator | Sep 1997 |
| 293 | Trans Pacific Oi | | Oil & Gas Operator | May 1995 |
| 294 | Trans Pacific Oil Corporation | Wichita, KS 67202 | Oil & Gas Operator | Nov 2025 |
| 295 | Trek Aec, LLC | Wichita, KS 67202 | Oil & Gas Operator | Sep 2025 |
| 296 | Unknown | Houston, TX 77208 | Oil & Gas Operator | Dec 2023 |
| 297 | Vac Petroleum Co | | Oil Operator | Dec 1990 |
| 298 | Val Energy, Inc. | Wichita, KS 67202 | Oil & Gas Operator | Sep 2025 |
| 299 | Vess Oil Corporation | Dallas, TX 75201 | Oil & Gas Operator | Dec 2025 |
| 300 | Vess Transpacifi | | Oil & Gas Operator | Jul 1995 |