| 201 | H & C Oil Operat | | Oil & Gas Operator | Dec 1996 |
| 202 | H & C Oil Operating Inc. | Plainville, KS 67663 | Oil & Gas Operator | Dec 2025 |
| 203 | H & W Oil Company, Incorporated | Palm Desert, CA 92255 | Oil Operator | Nov 2017 |
| 204 | H & W Oil Corpor | | Oil Operator | Dec 1996 |
| 205 | H3 Oil & Gas | | Oil & Gas Operator | Dec 2025 |
| 206 | Habit Petroleum, LLC | Hays, KS 67601 | Oil Operator | Dec 2025 |
| 207 | Haddock, Jack L. | Hays, KS 67601 | Oil Operator | Oct 2025 |
| 208 | Hallwood Petrole | | Oil & Gas Operator | Apr 1999 |
| 209 | Hallwood Petroleum, Inc. | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 210 | Hansen, Dane G. - Trust | Logan, KS 67646 | Oil Operator | Oct 2013 |
| 211 | Hellar Drilling | | Oil & Gas Operator | Jan 1994 |
| 212 | Helmerich & Payn | | Oil & Gas Operator | Aug 1995 |
| 213 | Heritage Oil L.L.C. | Hays, KS 67601 | Oil Operator | Dec 2025 |
| 214 | Herman L. Loeb LLC | Lawrenceville, IL 62439 | Oil & Gas Operator | Dec 2025 |
| 215 | Hertel Oil Company | | Oil Operator | Nov 2018 |
| 216 | Hertel Oil Company LLC | Hays, KS 67601 | Oil Operator | Dec 2025 |
| 217 | Hess Oil Company | McPherson, KS 67460 | Oil & Gas Operator | Dec 2025 |
| 218 | HG Oil Holdings, LLC | Hoisington, KS 67544 | Oil & Gas Operator | Dec 2025 |
| 219 | Hi-Kat Petroleum Company | Liberal, KS 67905-1261 | Oil & Gas Operator | May 2014 |
| 220 | High Plains Oil | | Oil Operator | Jun 1989 |
| 221 | Hillenburg Oil C | | Oil Operator | Apr 1994 |
| 222 | Hinkle Oil Compa | | Oil & Gas Operator | Nov 1994 |
| 223 | Hinkle Oil Company | Wichita, KS 67202 | Oil & Gas Operator | Jan 1999 |
| 224 | Hoffman Petroleu | | Oil Operator | Sep 1989 |
| 225 | Hoffman Petroleum, Inc. | Littleton, CO 80120 | Oil Operator | Sep 1996 |
| 226 | Hoffman Resources LLC | Hoisington, KS 67544 | Oil & Gas Operator | Dec 2025 |
| 227 | Hoffman, Myrle F. | Denver, CO 80202 | Oil Operator | Dec 1986 |
| 228 | Holt IVan | | Oil Operator | Mar 1989 |
| 229 | Holt IVan Leroy | | Oil & Gas Operator | Jan 1994 |
| 230 | Hub Oil Company | | Oil Operator | Jan 1990 |
| 231 | Hugoton Energy Corporation | Oklahoma City, OK 73113 | Oil & Gas Operator | Dec 2019 |
| 232 | Hummon Corp | Medicine Lodge, KS 67104 | Oil & Gas Operator | Apr 2023 |
| 233 | Hupfer Operating, Inc. | Shawnee, KS 66203 | Oil & Gas Operator | Dec 2019 |
| 234 | Ia Operating, Inc. | Edmond, OK 73003 | Oil Operator | Dec 2025 |
| 235 | Imperial American Oil Corporation | Wichita, KS 67205 | Oil Operator | Dec 2009 |
| 236 | Infinity Oil, Inc. | Hays, KS 67601 | Oil Operator | Dec 2025 |
| 237 | Isis Operating Inc | Russell, KS 67665 | Oil Operator | Dec 2019 |
| 238 | J & D Investment Co. | | Oil & Gas Operator | Dec 2025 |
| 239 | J And A Oil, LLC | Hays, KS 67601 | Oil Operator | Feb 2020 |
| 240 | Jacobs Fred T | | Oil Operator | Apr 1991 |
| 241 | Jade Resources, Inc. | Englewood, CO 80112 | Oil Operator | Jul 1998 |
| 242 | Jaed Production Co., | Arkansas City, KS 67005 | Oil & Gas Operator | Mar 2024 |
| 243 | Jason Oil Compan | | Oil Operator | Sep 1992 |
| 244 | Jason Oil Company, LLC | Russell, KS 67665 | Oil Operator | Dec 2025 |
| 245 | Jeff'S Oilwell Supervision | | Oil Operator | Oct 2025 |
| 246 | John C Ginther Oil, LLC | Hays, KS 67601 | Oil Operator | Dec 2025 |
| 247 | John O. Farmer, Inc. | | Oil & Gas Operator | Dec 1996 |
| 248 | Jolen Operating Company | Oklahoma City, OK 73102 | Oil & Gas Operator | Jan 2026 |
| 249 | K & E Drilling I | | Oil & Gas Operator | Sep 1995 |
| 250 | Kaiser-Francis O | | Oil & Gas Operator | Oct 1995 |
| 251 | Kaiser-Francis Oil | | Oil Operator | Nov 1995 |
| 252 | Kaiser-Francis Oil Company | Tulsa, OK 74121 | Oil & Gas Operator | Apr 2026 |
| 253 | Kansas Crude Investments LLC | Hays, KS 67601 | Oil Operator | Dec 2025 |
| 254 | Karper Oil & Gas Corporation | Graham, TX 76450 | Oil & Gas Operator | Apr 2026 |
| 255 | Karst Brothers Oil Co, A General Partnership | Russell, KS 67665 | Oil Operator | Dec 2025 |
| 256 | Keller Heirs Oil | | Oil Operator | Nov 2025 |
| 257 | Kimbark Oil & Ga | | Oil & Gas Operator | Aug 1992 |
| 258 | King Oil Operations, LLC | Ellis, KS 67637 | Oil Operator | Dec 2025 |
| 259 | Kiska Oil Company | Tulsa, OK 74114 | Oil & Gas Operator | Jan 2019 |
| 260 | KLB Operating, Inc. | Plainville, KS 67663 | Oil Operator | Aug 2001 |
| 261 | Knighton Oil Com | | Oil & Gas Operator | Nov 1996 |
| 262 | Knighton Oil Company, Inc. | Wichita, KS 67206 | Oil & Gas Operator | Dec 2025 |
| 263 | Koron Investments, Inc. | Hays, KS 67601 | Oil Operator | Dec 2025 |
| 264 | L & D Operation | Victoria, KS 67671 | Oil Operator | Jun 1988 |
| 265 | L & F Oil Operat | | Oil Operator | Sep 1987 |
| 266 | L & L Resources, Inc. | Hays, KS 67601 | Oil Operator | Mar 1986 |
| 267 | L-K Wireline, Inc. | Hays, KS 67601 | Oil Operator | Dec 2019 |
| 268 | L. D. Drilling, Inc. | Great Bend, KS 67530 | Oil & Gas Operator | Dec 2025 |
| 269 | Lackey Milton | | Oil & Gas Operator | Feb 1995 |
| 270 | Landmark Resources, Inc. | Houston, TX 77056 | Oil & Gas Operator | Dec 2025 |
| 271 | Landowner | Honolulu, HI | Oil & Gas Operator | Dec 2008 |
| 272 | Lario Oil & Gas | | Oil & Gas Operator | Nov 1995 |
| 273 | Lario Oil & Gas Company | Odessa, TX 79762 | Oil & Gas Operator | Apr 2026 |
| 274 | Larson Operating | | Oil & Gas Operator | Mar 2001 |
| 275 | Larson Operating Company | Olmitz, KS 67564-8561 | Oil & Gas Operator | Dec 2019 |
| 276 | Leavell Resource | | Oil Operator | Dec 1993 |
| 277 | Leavell Resources Corporation | Hays, KS 67601 | Oil & Gas Operator | Mar 2015 |
| 278 | Leben Drilling I | | Oil & Gas Operator | Dec 1988 |
| 279 | Lebsack Oil Prod | | Oil & Gas Operator | Nov 1995 |
| 280 | Lebsack Oil Production Inc. | Stafford, KS 67578 | Oil & Gas Operator | Dec 2025 |
| 281 | Legacy Energy, LLC | Russell, KS 67665 | Oil Operator | Dec 2025 |
| 282 | Leiker, Edward P. | Hays, KS 67601 | Oil Operator | Apr 1992 |
| 283 | Liberty Enterpri | | Oil Operator | Jan 1987 |
| 284 | Liberty Oper & Compl, Inc | Plainville, KS 67663 | Oil & Gas Operator | Dec 2022 |
| 285 | Lone Star Oil Co. | Jacksboro, TX 76458 | Oil & Gas Operator | Dec 2025 |
| 286 | LRC Development Corporation | Hays, KS 67601 | Oil Operator | Mar 2009 |
| 287 | M & G Oil Company | Marble Falls, TX 78654 | Oil & Gas Operator | Apr 2026 |
| 288 | M & G Oil Inc | Russell, KS 67665 | Oil Operator | Dec 2025 |
| 289 | M.A. Yost Operations, Inc | Russell, KS 67665 | Oil Operator | Dec 2025 |
| 290 | Mad Operators LLC | | Oil & Gas Operator | Dec 2025 |
| 291 | Mai Oil Operations, Inc. | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 292 | Mai Operations | | Oil Operator | Dec 1996 |
| 293 | Manning, Gregory | Ellinwood, KS 67526 | Oil Operator | Dec 2025 |
| 294 | Manta Petroleum, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Jun 2020 |
| 295 | Manuel Corporation | Wichita, KS 67206 | Oil & Gas Operator | Feb 2026 |
| 296 | Mar-Lou Oil Co., LLC | Wilson, KS 67490 | Oil Operator | Dec 2025 |
| 297 | Marathon Oil Com | | Oil & Gas Operator | Dec 1996 |
| 298 | Marathon Oil Company | Houston, TX 77252 | Oil & Gas Operator | Feb 2026 |
| 299 | Marmac Petroleum | | Oil & Gas Operator | Oct 1994 |
| 300 | Marmac Petroleum Company | Denver, CO 80222 | Oil Operator | Apr 1998 |