| 201 | Kantor Oil Compa | | Oil Operator | Aug 1994 |
| 202 | Kantor Oil Company, LLC | Tulsa, OK 74136 | Oil & Gas Operator | Feb 2025 |
| 203 | Kar Oil Company | Iowa Park, TX 76367 | Oil & Gas Operator | Jun 2025 |
| 204 | Kara Enterprises Inc | Upton, WY 82730 | Oil Operator | Jul 2013 |
| 205 | Karbank, Barney | Kansas City, MO 64199 | Oil Operator | Sep 2001 |
| 206 | Karbuhn Oil Company | Tomball, TX 77375 | Oil & Gas Operator | Jun 2025 |
| 207 | Kardaleff Steven T | Lawton, OK 73507-8471 | Oil Operator | Mar 2015 |
| 208 | Karen D. Mott & Mark D. Covert | Bolivar, NY 14715 | Oil & Gas Operator | Dec 2023 |
| 209 | Karenco Energy, Incorporated | Seguin, TX 78155 | Oil & Gas Operator | Oct 1997 |
| 210 | Karico GP, LLC | Midland, TX 79705 | Oil & Gas Operator | Jun 2025 |
| 211 | Karis Resources, LLC | Tyler, TX 75707 | Oil & Gas Operator | Feb 2019 |
| 212 | Karlton Terry Oil Company | | Oil Operator | Jan 1991 |
| 213 | Karper Company, The | Graham, TX 76450 | Oil & Gas Operator | Feb 2003 |
| 214 | Karper Oil & Gas Corporation | Graham, TX 76450 | Oil & Gas Operator | Jun 2025 |
| 215 | Karst Brothers Oil Co, A General Partnership | Russell, KS 67665 | Oil Operator | Feb 2025 |
| 216 | Karst Don Well S | | Oil Operator | Oct 1990 |
| 217 | Karst Incorporated | Fort Worth, TX 76116 | Oil Operator | Jun 2025 |
| 218 | Karst, Elmer L | Russell, KS 67665 | Oil Operator | Feb 1990 |
| 219 | Karsted Operating, LLC | Billings, MT 59102 | Oil Operator | Mar 2025 |
| 220 | Kas Productions | La Veta, CO 81055 | Oil Operator | Mar 2008 |
| 221 | Kasan Corp. | Pharr, TX 78577 | Oil & Gas Operator | Sep 1995 |
| 222 | Kase Energy LLC | Roseville, MN 55113 | Oil Operator | Aug 2006 |
| 223 | Kash Oil And Gas, Inc | | Oil & Gas Operator | Oct 2020 |
| 224 | Kash Operating LLC | Maljamar, NM 88264 | Oil Operator | Oct 2024 |
| 225 | Kasle Energy Inc. | Cross Plains, TX 76443 | Oil & Gas Operator | Mar 2017 |
| 226 | Kasperski Oil Corp | | Oil & Gas Operator | May 2002 |
| 227 | Kastle Resources Enterprises Inc | Wooster, OH 44691 | Oil & Gas Operator | Dec 2024 |
| 228 | Kastman Oil Company | Lubbock, TX 79408 | Oil & Gas Operator | Nov 2012 |
| 229 | Kastman Oil Company, LLC | Lubbock, TX 79408 | Oil Operator | Jun 2025 |
| 230 | Kasturi Properties, LTD. | Dunkirk, NY 14048 | Gas Operator | Dec 2023 |
| 231 | Kat Energy Corporation | Amarillo, TX 79105 | Gas Operator | Sep 2001 |
| 232 | Kat Energy, LTD. | Amarillo, TX 79120 | Gas Operator | Jun 2020 |
| 233 | Katana Resources | | Oil & Gas Operator | Aug 1984 |
| 234 | Kate F H | Oklahoma City, OK 73122 | Oil & Gas Operator | Jun 2000 |
| 235 | Katherman Vance E | Casper, WY 82601 | Oil Operator | Dec 2004 |
| 236 | Kathler Oil Interests | Frisco, TX 75034 | Oil & Gas Operator | Jun 2025 |
| 237 | Kato Operating C | | Oil Operator | Aug 1988 |
| 238 | Kato Operating Company | Bristow, OK 74010 | Oil & Gas Operator | Mar 2015 |
| 239 | Katsco Energy, Inc. | Round Rock, TX 78664 | Oil & Gas Operator | Jun 2025 |
| 240 | Katy Drilling Corporation | Tulsa, OK 74146-3717 | Oil & Gas Operator | Apr 2020 |
| 241 | Katy Resources Etx, LLC | Shreveport, LA 71101 | Oil & Gas Operator | Mar 2011 |
| 242 | Katy Resources LLC | Arlington, TX 76016 | Oil & Gas Operator | Jun 2025 |
| 243 | Katz Joe Oil Acc | | Oil Operator | Oct 1995 |
| 244 | Katz Oil Co. | San Antonio, TX 78218 | Oil & Gas Operator | Dec 2002 |
| 245 | Kauffman K P Company Inc | Denver, CO 80202 | Oil & Gas Operator | Mar 1996 |
| 246 | Kauthar Energy Co., Inc. | | Oil & Gas Operator | Dec 2002 |
| 247 | Kavanaugh Energy Services, Inc. | | Gas Operator | Mar 2025 |
| 248 | Kavouras Thomas | Apollo, PA 15613-1108 | Oil & Gas Operator | Dec 2023 |
| 249 | Kay County Properties | Tulsa, OK 74145 | Oil & Gas Operator | May 1997 |
| 250 | Kay Dee Oil | | Oil Operator | Feb 2025 |
| 251 | Kay Jay Oil Co | Artesia, NM 88210 | Oil & Gas Operator | May 2001 |
| 252 | Kay Lease Service | | Oil Operator | Feb 1981 |
| 253 | Kay Operating Co. | | Oil Operator | May 1982 |
| 254 | Kay Production Company Inc | Seminole, OK 74868 | Oil & Gas Operator | Feb 2025 |
| 255 | Kay-Lyn Petroleum Co. | | Oil & Gas Operator | Oct 1989 |
| 256 | Kaye Poth Oil Corp. | Seguin, TX 78155 | Oil & Gas Operator | May 1998 |
| 257 | Kaye R. McCown | | Oil Operator | Jun 2012 |
| 258 | Kayuga Co. | Tulsa, OK 74133 | Oil & Gas Operator | Jun 2025 |
| 259 | KB Oil & Gas | | Oil & Gas Operator | Mar 2025 |
| 260 | KBD Oil And Gas Production LLC | Brinkhaven, OH 43006 | Oil & Gas Operator | Dec 2024 |
| 261 | KBW Oil & Gas Co | Kiowa, KS 67070 | Oil & Gas Operator | Jul 2024 |
| 262 | KC Resources Inc | Snowmass VLG., CO 81615 | Oil & Gas Operator | Feb 2025 |
| 263 | KC Well Service | Big Piney, WY 83113 | Gas Operator | Mar 2025 |
| 264 | KCM Management, Inc. | Dallas, TX 75230 | Oil & Gas Operator | Oct 2014 |
| 265 | KCP Of MS Inc | | Oil & Gas Operator | Jan 1991 |
| 266 | KCR Energy, L.L.C. | Fate, TX 75132 | Oil Operator | Jun 2025 |
| 267 | KCS Energy Inc | Warren, PA 16365-0187 | Oil & Gas Operator | Dec 2024 |
| 268 | KCS Medallion Resources, Inc. | Tulsa, OK 74136 | Oil & Gas Operator | Nov 2018 |
| 269 | KCS Mountain Resources Inc | Manderson, WY 82432 | Oil & Gas Operator | Nov 2006 |
| 270 | KCS Resources LLC | Houston, TX 77027 | Oil & Gas Operator | Feb 2017 |
| 271 | KCS Resources, Inc. | Houston, TX 77002 | Oil & Gas Operator | Feb 2009 |
| 272 | KD Energy, LLC | Houston, TX 77056 | Oil & Gas Operator | Jun 2025 |
| 273 | KDM Operating, LLC | The Woodlands, TX 77380 | Oil Operator | Jun 2025 |
| 274 | KDM Production Co | Ozona, TX 76943 | Oil & Gas Operator | Jun 2025 |
| 275 | Ke-La-Da Enterprises, Inc. | | Oil Operator | Dec 1984 |
| 276 | Keahey Exploration, Inc. | San Antonio, TX 78209 | Oil & Gas Operator | Mar 2002 |
| 277 | Keane Dev | Bradford, PA 16701-3901 | Oil & Gas Operator | Dec 1998 |
| 278 | Keas Production Company LLC | Estes Park, CO 80517 | Oil Operator | Jan 2025 |
| 279 | Keating Energy, Inc. | Ambler, PA 19002 | Oil & Gas Operator | Jun 2025 |
| 280 | Keba Energy LLC | Houston, TX 77002 | Oil & Gas Operator | Jul 2015 |
| 281 | Kebo Oil & Gas, Inc. | Portland, TX 78374 | Oil & Gas Operator | Jun 2025 |
| 282 | Kebrh Operating LLC | | Oil & Gas Operator | Jan 2024 |
| 283 | Kec Enterprises, Inc. | Springtown, TX 76082 | Oil & Gas Operator | Jun 2025 |
| 284 | Kecco, Inc. | | Oil Operator | May 2002 |
| 285 | Kechi Energy LLC | Chickasha, OK 73018 | Oil & Gas Operator | Mar 2025 |
| 286 | Keck Partners | | Oil & Gas Operator | Apr 1989 |
| 287 | Keck Petroleum LLC | Okmulgee, OK 74447-8516 | Oil & Gas Operator | Jan 2025 |
| 288 | Keck Timothy A | Summerville, PA 15864-6301 | Gas Operator | Dec 2014 |
| 289 | Kedco Management Corp | | Oil & Gas Operator | Jul 1985 |
| 290 | Keel Dwight E | Broken Arrow, OK 74014-7569 | Oil Operator | Apr 2020 |
| 291 | Keelex Corporation | | Oil & Gas Operator | Dec 2021 |
| 292 | Keeley Oil, L.L.C. | Dallas, TX 75225 | Oil Operator | Jun 2025 |
| 293 | Keen Oil Co | | Oil & Gas Operator | Feb 2025 |
| 294 | Keen Operating Company, Inc. | Austin, TX 78705 | Oil & Gas Operator | Aug 2001 |
| 295 | Keene, Roy J. Jr. | Sugar Land, TX 77498 | Oil & Gas Operator | Jun 2016 |
| 296 | Keener Oil & Gas Company | Tulsa, OK 74119-4416 | Oil & Gas Operator | Mar 2025 |
| 297 | Keener Oil Compa | | Oil & Gas Operator | Jul 1988 |
| 298 | Keener Oil Company | Tulsa, OK 74103 | Oil & Gas Operator | Feb 2018 |
| 299 | Keesee Paul Inc | Holdenville, OK 74848 | Oil & Gas Operator | Nov 1998 |
| 300 | Keesun Corporation | Cut Bank, MT 59427 | Oil & Gas Operator | Mar 2025 |