| 201 | International Petroleum Service, LLC | | Oil Operator | Dec 2017 |
| 202 | International Ventures Inc | Pogasa Springs, CO 81147 | Oil Operator | Jul 1996 |
| 203 | International Western Oil Corp | Weatherford, TX 76086 | Oil & Gas Operator | Dec 2025 |
| 204 | Internorth Inc | Tulsa, OK 74136 | Oil & Gas Operator | Apr 2014 |
| 205 | Interstate Energy Inc | | Oil & Gas Operator | Dec 2002 |
| 206 | Interstate Explorations LLC | Houston, TX 77010 | Oil & Gas Operator | Dec 2025 |
| 207 | Interstate Gas Co. | | Gas Operator | Dec 1941 |
| 208 | Interstate Gas MKT Inc | Indiana, PA 15701 | Oil & Gas Operator | Dec 2018 |
| 209 | Interstate Natural Gas Company, LLC | Pikeville, KY 41502 | Oil & Gas Operator | Dec 2023 |
| 210 | Interstate Operating LLC | Tulsa, OK 74101-0535 | Oil & Gas Operator | Aug 2013 |
| 211 | Interstate Producing Ser Inc | | Oil & Gas Operator | May 1986 |
| 212 | Interstate Producing Servs,Inc | | Oil & Gas Operator | May 1987 |
| 213 | Interstate Production Company, Inc. | Buckhannon, WV 26201-0000 | Oil & Gas Operator | Dec 2021 |
| 214 | Intoil, Inc. | Englewood, CO 80155 | Oil & Gas Operator | Dec 2002 |
| 215 | Intrepid Drilling, LLC | | Oil & Gas Operator | Jan 2025 |
| 216 | Intrepid Energy Corporation | Independence, KS 67301 | Oil Operator | Mar 2016 |
| 217 | Intrepid Oil & Gas LLC | Denver, CO 80202 | Oil & Gas Operator | Apr 2021 |
| 218 | Intrepid Operating LTD., Co | Hobbs, NM 88241 | Oil & Gas Operator | Nov 2009 |
| 219 | Intrepid Production Corporation | Denver, CO 80202 | Oil & Gas Operator | Oct 2025 |
| 220 | Investco Oil And Gas Inc | | Oil & Gas Operator | Jan 2025 |
| 221 | Investment Equipment LLC | FT Morgan, CO 80701 | Oil & Gas Operator | Oct 2025 |
| 222 | Investment Land Services Inc | | Oil Operator | Oct 2001 |
| 223 | Investment Operating Co | Stillwater, OK 74075-8572 | Oil Operator | Aug 2025 |
| 224 | Investment Trends Corp. | | Gas Operator | Mar 1988 |
| 225 | Investors Drilli | | Gas Operator | Jan 1993 |
| 226 | Investors Oil, Inc. | | Oil Operator | Mar 1985 |
| 227 | Investors Resources Corp | Edmond, OK 73034 | Oil & Gas Operator | Nov 2025 |
| 228 | Invitation Energy, Incorporated | | Oil & Gas Operator | Dec 2021 |
| 229 | Invito Operating, LLC | McKinney, TX 75070 | Oil & Gas Operator | Nov 2025 |
| 230 | Invoil, Inc. | Oklahoma City, OK 73112 | Oil & Gas Operator | Dec 2025 |
| 231 | Iochem Corporation | Oklahoma City, OK 73118-7483 | Oil & Gas Operator | Sep 2025 |
| 232 | Ioe Acres V LLC | Perry, NY 14530 | Gas Operator | Dec 2024 |
| 233 | Iowa Production Company, Inc. | | Oil & Gas Operator | Jan 1992 |
| 234 | Ip Petroleum Company, Inc. | Houston, TX 77210 | Oil & Gas Operator | Mar 2008 |
| 235 | Ipact | Austin, TX 78734 | Oil & Gas Operator | Dec 2025 |
| 236 | Ipas Oil Company LLC | Pratt, KS 67124 | Oil Operator | Dec 2019 |
| 237 | Ipr Energy Partners, L.P. | Bowie, TX 76230 | Oil & Gas Operator | Aug 2014 |
| 238 | Ipr Energy Partners, LLC | Bowie, TX 76230 | Oil & Gas Operator | Dec 2025 |
| 239 | Ipr USA Corp. | Irving, TX 75039 | Oil & Gas Operator | Jun 2009 |
| 240 | Ipt Oil Company | Evansville, IN 47706 | Oil & Gas Operator | Dec 2025 |
| 241 | Ira Oil & Gas LLC | Addison, TX 75001 | Oil & Gas Operator | Jul 2008 |
| 242 | Ira Testers | Ira, TX 79527 | Oil & Gas Operator | Mar 2024 |
| 243 | Ira Testers, LLC | Ira, TX 79527 | Oil Operator | Dec 2025 |
| 244 | Irani Engineering | | Gas Operator | Dec 1995 |
| 245 | Irene L. Heary Irrevocable Trust | Springville, NY 14141 | Gas Operator | Dec 2024 |
| 246 | Irex Corporation | Englewood, CO 80111 | Oil & Gas Operator | May 2000 |
| 247 | Irion Corporation, The | San Angelo, TX 76906 | Oil & Gas Operator | Jun 2021 |
| 248 | Irish City Oil & Gas, Inc. | Wimberley, TX 78676 | Oil & Gas Operator | Dec 2025 |
| 249 | Irish Oil & Gas Co. | Houston, TX 77242 | Oil & Gas Operator | Aug 2003 |
| 250 | Iron Bell Operating, LLC | Lubbock, TX 79423 | Oil & Gas Operator | Dec 2025 |
| 251 | Iron City Wells LLC | Saxonburg, PA 16056-8802 | Gas Operator | Nov 2025 |
| 252 | Iron Creek Properties Inc | Casper, WY 82604 | Oil & Gas Operator | Sep 2025 |
| 253 | Iron Hawk Energy Group Joint Venture | Tulsa, OK 74103 | Oil & Gas Operator | Oct 2025 |
| 254 | Iron Horse Oil & Gas, Inc. | Albany, TX 76430 | Oil & Gas Operator | Dec 2025 |
| 255 | Iron Oil Operating, LLC | | Oil & Gas Operator | Nov 2025 |
| 256 | Iron Orchard Operating LLC | Houston, TX 77024 | Oil & Gas Operator | Dec 2025 |
| 257 | Iron Pennsylvania Land LLC | Waynesburg, PA 15370 | Gas Operator | Dec 2024 |
| 258 | Iron Post Oil & Gas Co Inc | Bristow, OK 74010-4120 | Oil & Gas Operator | Oct 2025 |
| 259 | Iron Ridge Operating, LLC | Austin, TX 78738 | Oil & Gas Operator | Dec 2025 |
| 260 | Iron Sights Operating, Inc. | Stillwater, OK 74076 | Oil & Gas Operator | Jul 2022 |
| 261 | Iron Springs Operating Co. Inc | | Oil & Gas Operator | Jan 2025 |
| 262 | Iron Star Energy LLC | Houston, TX 77037-1142 | Oil & Gas Operator | Oct 2025 |
| 263 | Ironhorse Operations, LLC | Kilgore, TX 75663 | Oil Operator | Dec 2025 |
| 264 | Ironroc Energy | The Woodlands, TX 77381 | Oil & Gas Operator | Dec 2025 |
| 265 | Ironwood Exploration Inc | | Oil & Gas Operator | Mar 1995 |
| 266 | Ironwood Oil & Gas LLC | Houston, TX 77067 | Oil & Gas Operator | Jun 2014 |
| 267 | Iroquois Ave LLC | Edinboro, PA 16412 | Gas Operator | Dec 2020 |
| 268 | Iroquois Central School District | Elma, NY 14059 | Gas Operator | Dec 2024 |
| 269 | Irvin Drilling Corp | Zanesville, OH 43701 | Oil & Gas Operator | Dec 1990 |
| 270 | Irvin Operations, Inc. | | Oil Operator | Aug 1996 |
| 271 | Irvin Petroleum | Stinnett, TX 79083 | Oil & Gas Operator | Sep 1996 |
| 272 | Irvin Petroleum Inc. | Stinnett, TX 79083 | Oil & Gas Operator | Apr 2016 |
| 273 | Irwin H. Parnes | | Oil Operator | Jun 1982 |
| 274 | Irwin-Crum | Nocona, TX 76255 | Oil Operator | Dec 2025 |
| 275 | Is Energy, LLC | Seminole, TX 79360 | Oil Operator | Dec 2025 |
| 276 | Isaacs Billy J/Juanda R Living Trust | Konawa, OK 74849-6021 | Oil Operator | Oct 2025 |
| 277 | Isaacs Fairy J | Konawa, OK 74849-0134 | Oil Operator | Sep 2020 |
| 278 | Isaacson Energy Resources, LLC | Austin, TX 78741 | Oil & Gas Operator | Dec 2025 |
| 279 | Isaia, Deborah | East Aurora, NY 14052 | Gas Operator | Dec 2024 |
| 280 | Isbell, Bob G. Operating | Cisco, TX 76437 | Oil & Gas Operator | Mar 2015 |
| 281 | Isbrandtsen Oil And Gas Co | | Oil Operator | Mar 2002 |
| 282 | Iseman William R | Ford City, PA 16226-1488 | Gas Operator | Dec 2024 |
| 283 | Isern, James R. | Wichita, KS 67277 | Oil Operator | Apr 1996 |
| 284 | Isern-Schultz Oi | | Oil & Gas Operator | Jul 1988 |
| 285 | Isis Operating Inc | Russell, KS 67665 | Oil Operator | Dec 2019 |
| 286 | Iskandia Energy Operating, Inc. | Houston, TX 77002 | Oil & Gas Operator | Dec 2025 |
| 287 | Island Energy Partners LLC | | Gas Operator | Jan 2018 |
| 288 | Island Exploration | Houston, TX 77058 | Oil & Gas Operator | Dec 2025 |
| 289 | Island Petroleum, Inc. | | Gas Operator | Mar 1998 |
| 290 | Isom Energy, Inc. | San Angelo, TX 76904 | Oil & Gas Operator | May 2018 |
| 291 | Ison, Samuel M | Isonville, KY 41149 | Oil Operator | Dec 2023 |
| 292 | It'LL Do Oil Company | Graham, TX 76450 | Oil & Gas Operator | Nov 2024 |
| 293 | Italian-American Oil Co., Inc. | Tomball, TX 77377 | Oil & Gas Operator | Dec 2025 |
| 294 | Itawamba Industrial Gas Co | | Gas Operator | Dec 1999 |
| 295 | Itech Oil Company | Cypress, TX 77429 | Oil & Gas Operator | Aug 2007 |
| 296 | Itr Petroleum Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 1998 |
| 297 | Itx Corporation | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 298 | Itx Pipeline Company, LLC | Dallas, TX 75225 | Oil & Gas Operator | Dec 2025 |
| 299 | Iuka-Carmi Development LLC | Pratt, KS 67124 | Oil & Gas Operator | Sep 2025 |
| 300 | Iv L.C. | San Antonio, TX 78209 | Oil & Gas Operator | Dec 2025 |