| CARBON CREEK ENERGY LLC | 4,668 | 8,797 |
| PUREWEST RESOURCES INC | 3,516 | 4,666 |
| CROWHEART ENERGY LLC | 3,018 | 4,155 |
| JONAH ENERGY LLC | 2,498 | 3,099 |
| CONTANGO RESOURCES LLC | 1,830 | 4,217 |
| MERIT ENERGY COMPANY | 1,725 | 2,267 |
| HILCORP ENERGY COMPANY | 1,623 | 1,942 |
| EOG RESOURCES INC | 1,136 | 14,521 |
| GREYLOCK PRODUCTION LLC | 820 | 985 |
| M & K OIL COMPANY LLC | 617 | 905 |
| WEXPRO COMPANY | 570 | 1,088 |
| GREEN RESERVE ENERGY HOLDINGS LLC | 550 | 1,425 |
| CONTINENTAL RESOURCES INC | 525 | 1,813 |
| URBAN OIL & GAS GROUP LLC | 484 | 553 |
| CITATION OIL & GAS CORPORATION | 480 | 973 |
| BREITBURN OPERATING L.P. | 456 | 728 |
| DENBURY ONSHORE LLC | 431 | 1,155 |
| DEVON ENERGY PRODUCTION COMPANY LP | 366 | 5,854 |
| POWDER BATTALION HOLDINGS LLC | 351 | 641 |
| AMPLIFY ENERGY OPERATING LLC | 324 | 391 |
| MATRIX PRODUCTION COMPANY | 306 | 365 |
| ANSCHUTZ EXPLORATION CORPORATION | 266 | 5,130 |
| SUNSHINE VALLEY PETROLEUM | 262 | 419 |
| AETHON ENERGY OPERATING LLC | 257 | 430 |
| OSAGE PARTNERS LLC | 255 | 651 |
| WESCO OPERATING INC | 241 | 419 |
| XTO ENERGY INC | 201 | 304 |
| BEARCAT ENERGY LLC (COLORADO) | 199 | 964 |
| RANGEVIEW RESOURCES OPERATING CO | 197 | 258 |
| BLACK THUNDER OIL LLC | 190 | 301 |
| RICHARDSON OPERATING CO | 179 | 358 |
| WIND RIVER ENERGY COMMISSION | 174 | 248 |
| WRC ENERGY LLC | 173 | 2,538 |
| TRUE OIL LLC | 173 | 1,393 |
| VAQUERO BIG HORN LLC | 167 | 224 |
| BLACK BEAR OIL CORPORATION | 156 | 201 |
| SNOWY OWL LLC | 150 | 261 |
| BALLARD PETROLEUM HOLDINGS LLC | 149 | 1,547 |
| NORTH SHORE EXPLORATION & PROD LLC | 143 | 188 |
| SIGNAL HILL COMPANY LLC | 138 | 242 |
| VERMILION ENERGY USA LLC | 136 | 503 |
| VALKYRIE OPERATING LLC | 136 | 219 |
| BARN OWLS LLC | 135 | 155 |
| COWBOY CLEAN FUELS LLC | 135 | 150 |
| PINE HAVEN RESOURCES LLC | 128 | 1,478 |
| ANADARKO E&P ONSHORE LLC | 118 | 9,413 |
| CHACO ENERGY COMPANY | 109 | 146 |
| PEAK POWDER RIVER RESOURCES LLC | 101 | 688 |
| SAMSON EXPLORATION LLC | 101 | 655 |
| HYPERION OIL & GAS LLC | 99 | 128 |