| 201 | Grayling Oil Inc | | Oil & Gas Operator | Feb 1995 |
| 202 | Grayrock Energy, LLC | Fort Worth, TX 76114 | Oil & Gas Operator | Jun 2025 |
| 203 | Grayson Operating LLC | Ada, OK 74820 | Oil & Gas Operator | Jun 2025 |
| 204 | GRB Properties, Inc. | Midland, TX 79705 | Oil & Gas Operator | Mar 2003 |
| 205 | Great Basins Petroleum Co. | | Gas Operator | Mar 2015 |
| 206 | Great Horned Owls, LLC | Katy, TX 77494 | Oil & Gas Operator | Jun 2025 |
| 207 | Great Northern Gas Company | Denver, CO 80293-0602 | Oil & Gas Operator | Jul 2017 |
| 208 | Great Plains Oil & Gas | Ada, OK 74820-7209 | Oil & Gas Operator | May 2013 |
| 209 | Great Plains Operating Inc | Bristow, OK 74010 | Oil & Gas Operator | Dec 1998 |
| 210 | Great Plains Petroleum, Inc. | Snyder, TX 79549 | Oil & Gas Operator | Jun 2025 |
| 211 | Great Plains Pipeline Company | Tulsa, OK 74135-6405 | Oil & Gas Operator | Jul 2014 |
| 212 | Great Southwestern Expl Inc | Tulsa, OK 74105 | Oil & Gas Operator | Jun 2025 |
| 213 | Great Western Drilling Co | Midland, TX 79701 | Oil & Gas Operator | Oct 2025 |
| 214 | Great Western Equipment Co | Mustang, OK 73064 | Oil & Gas Operator | Jun 2025 |
| 215 | Great Western Land Co Inc | Tulsa, OK 74136-1517 | Oil & Gas Operator | Jun 2000 |
| 216 | Great Yellowstone Corp. | | Oil & Gas Operator | Apr 1993 |
| 217 | Greehey & Company, LTD. | San Antonio, TX 78216 | Oil & Gas Operator | May 2020 |
| 218 | Green Energy Company | Okmulgee, OK 74447 | Oil & Gas Operator | May 2013 |
| 219 | Green Operating Company, Inc. | Tulsa, OK 74135 | Oil & Gas Operator | Jun 2025 |
| 220 | Green River Exploration Co | Tulsa, OK 74121-1468 | Oil & Gas Operator | Sep 2011 |
| 221 | Green River Operating Co Inc | Noble, OK 73068-5521 | Oil & Gas Operator | Feb 2018 |
| 222 | Green River Resources Inc. | Keystone, CO 80435 | Oil & Gas Operator | Oct 2025 |
| 223 | Green Valley Disposal Serv LLC | Alva, OK 73717 | Oil Operator | Jun 2025 |
| 224 | Green William G | Jenks, OK 74037-3233 | Oil & Gas Operator | Apr 2020 |
| 225 | Green'S Drillng & Mud Ser Inc | Konawa, OK 74849 | Oil Operator | Jan 2013 |
| 226 | Greenhead Energy Operating LLC | Oklahoma City, OK 73131 | Oil & Gas Operator | Jul 2025 |
| 227 | Greenlee Oil And Gas LLC | Norman, OK 73072 | Oil & Gas Operator | Jun 2025 |
| 228 | Greenwood Energy Inc | Oklahoma City, OK 73116-9083 | Oil & Gas Operator | Mar 2015 |
| 229 | Greenwood Janet | Mannford, OK 74044 | Oil Operator | Apr 2014 |
| 230 | Greenwood Oil Company | Skiatook, OK 74070 | Oil & Gas Operator | Aug 2013 |
| 231 | Greer & Beckham Gas Co Inc | Shamrock, TX 79079-0606 | Oil & Gas Operator | Aug 2013 |
| 232 | Greer Family Trust | Ponca City, OK 74601-8126 | Oil Operator | Aug 2018 |
| 233 | Greer Tom R | Ponca City, OK 74602-2444 | Oil & Gas Operator | May 2013 |
| 234 | Greg Davis Investments Inc | Edmond, OK 73034-6621 | Oil Operator | May 2020 |
| 235 | Greg Hall Oil & Gas LLC | Norman, OK 73072 | Oil & Gas Operator | Jun 2025 |
| 236 | Greystone Exploration Co | Oklahoma City, OK 73177 | Oil & Gas Operator | Apr 1996 |
| 237 | Gribble Jr R W | Dallas, TX 75235 | Oil & Gas Operator | Apr 2014 |
| 238 | Gribble Oil Corporation | Dallas, TX 75235 | Oil Operator | Aug 1994 |
| 239 | Griebel-Valliquette | Stroud, OK 74079-0231 | Oil & Gas Operator | Aug 2016 |
| 240 | Griffin Resources LLC | Breckenridge, TX 76424 | Oil & Gas Operator | Oct 2025 |
| 241 | Griffin Well Service Inc | Konawa, OK 74849-9710 | Oil & Gas Operator | Jun 2025 |
| 242 | Griffith Petroleum Services Inc | Kingston, OK 73439 | Oil & Gas Operator | Jun 2025 |
| 243 | Griggs Josh | Dewey, OK 74029 | Oil Operator | Jun 2025 |
| 244 | Griggs Oil LLC | Dewey, OK 74029-0477 | Oil & Gas Operator | Jun 2025 |
| 245 | Griswold Energy LLC | Oologah, OK 74053-6228 | Oil Operator | Jun 2025 |
| 246 | Grizzly Operating LLC | Houston, TX 77057 | Oil & Gas Operator | Jul 2025 |
| 247 | Grooms T D | Stillwater, OK 74075-3600 | Oil & Gas Operator | Oct 2001 |
| 248 | Gross Jack L Production | Borger, TX 79008-0065 | Gas Operator | Mar 2015 |
| 249 | Gross, Charles E. | Dallas, TX 75220 | Oil & Gas Operator | Feb 2012 |
| 250 | Ground Development Company Inc | Dallas, TX 75229-0377 | Oil & Gas Operator | Jan 2013 |
| 251 | Grubb F W "Forest" | Garber, OK 73738-0186 | Oil & Gas Operator | Jun 2005 |
| 252 | Grubb Ronald J | Clinton, OK 73601-0906 | Oil & Gas Operator | Aug 2013 |
| 253 | Gruenerwald WM & Assoc Inc | Colorado Spring, CO 80960-0669 | Oil & Gas Operator | Jan 2002 |
| 254 | Grynberg Petroleum Company | Greenwood Vge, CO 80111-3326 | Oil & Gas Operator | Oct 2019 |
| 255 | Guest Petroleum Incorporated | Edmond, OK 73013 | Oil & Gas Operator | Jul 2025 |
| 256 | Guest R E Oil Producer | Edmond, OK 73083-0805 | Oil & Gas Operator | Mar 2015 |
| 257 | Gugli Corporation | Byng, OK 74820 | Oil & Gas Operator | Sep 2014 |
| 258 | Guinn David E | Cleveland, OK 74020 | Oil & Gas Operator | Feb 2025 |
| 259 | Gulf Exploration, LLC | Oklahoma City, OK 73114 | Oil & Gas Operator | Sep 2025 |
| 260 | Gulf Production Corporation | Oklahoma City, OK 73114 | Oil & Gas Operator | Apr 2015 |
| 261 | Gulfport Energy Corporation | Oklahoma City, OK 73114-5003 | Oil & Gas Operator | Feb 2025 |
| 262 | Gulfport Midcon LLC | Oklahoma City, OK 73114-8132 | Oil & Gas Operator | Jul 2025 |
| 263 | Gulfstream Petroleum Corp. | | Oil & Gas Operator | Feb 2002 |
| 264 | Gungoll Carl E Estate | Oklahoma City, OK 73154-0466 | Oil & Gas Operator | Aug 2000 |
| 265 | Gungoll Henry H. Associates | Enid, OK 73701 | Oil & Gas Operator | Jun 2025 |
| 266 | Gunkel Charley Wayne Rev Inter VIvos Trust | Schulter, OK 74460-0010 | Gas Operator | Dec 2015 |
| 267 | Gunsight Energy Inc | Floydada, TX 79235-2521 | Oil Operator | Jun 2009 |
| 268 | Gunter Jim | Springer, OK 73458 | Oil Operator | May 2025 |
| 269 | GW Petroleum Inc | Houston, TX 77002 | Oil & Gas Operator | Apr 1993 |
| 270 | Gypsy Exploration LLC | Oklahoma City, OK 73123-1323 | Oil & Gas Operator | Dec 2014 |
| 271 | Gypsyglenn Oil Company LLC | Tulsa, OK 74119-4809 | Oil & Gas Operator | Jul 2025 |