The Appalachian Basin across West Virginia, Pennsylvania, Ohio, and eastern Kentucky is the largest natural gas producing region in the United States — the Marcellus and Utica shales atop more than a century of conventional development.
The Appalachian Basin (Marcellus & Utica) has approximately 554,998 wells operated by 22,592 companies. Below are the largest operators by well count. Data as of 2026-07-09.
| # | Operator | Wells | Producing |
|---|---|---|---|
| 1 | Diversified Production LLC | 48,911 | 47,914 |
| 2 | PA Dep Ofc Oil & Gas Mgmt | 12,944 | 655 |
| 3 | Eqt Production Company | 9,412 | 5,812 |
| 4 | Pennzoil Production Company | 9,078 | 751 |
| 5 | Quaker State | 8,978 | 201 |
| 6 | Ows Acquisition CO LLC | 7,263 | 7,235 |
| 7 | Pocahontas Gas | 4,790 | 4,717 |
| 8 | Chesapeake Energy | 4,464 | 946 |
| 9 | Range Resources | 4,409 | 2,172 |
| 10 | Kentucky West Virginia Gas Company | 4,393 | 2,351 |
| 11 | Enervest Operating | 4,226 | 3,704 |
| 12 | Minard Run Oil Company | 3,860 | 2,249 |
| 13 | PA Gen Energy | 3,560 | 788 |
| 14 | Greenway Energy LLC | 2,917 | 2,905 |
| 15 | Seneca Resources | 2,718 | 1,656 |
| 16 | Expand Oper LLC | 2,662 | 2,602 |
| 17 | Greylock Conventional | 2,653 | 2,627 |
| 18 | Eastern Gas Transmission And Storage INC | 2,645 | 877 |
| 19 | Antero Resources | 2,639 | 1,988 |
| 20 | East Resources | 2,618 | 525 |
| 21 | Ows Energy LLC | 2,602 | 2,602 |
| 22 | Ppp Future Development | 2,523 | 2,362 |
| 23 | Cnx Gas | 2,491 | 1,209 |
| 24 | Pillar Energy | 2,467 | 2,413 |
| 25 | Wv Mineral Group LLC | 2,419 | 2,413 |
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Well counts compiled by Buckhead Energy from state oil & gas regulator records (data as of 2026-07-09); reflect wells where each company is the current operator of record in the Appalachian Basin (Marcellus & Utica). Informational only.
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