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 557,688 wells operated by 22,611 companies. Below are the largest operators by well count. Data as of 2026-09-03.
| # | Operator | Wells | Have produced |
|---|---|---|---|
| 1 | Diversified Production LLC | 48,917 | 47,919 |
| 2 | PA Dep Ofc Oil & Gas Mgmt | 12,954 | 656 |
| 3 | Pennzoil Production Company | 9,078 | 751 |
| 4 | EQT Production Company | 9,064 | 5,462 |
| 5 | Quaker State | 8,981 | 204 |
| 6 | Ows Acquisition Co. LLC | 7,263 | 7,235 |
| 7 | Pocahontas Gas | 4,790 | 4,717 |
| 8 | Chesapeake Energy | 4,464 | 925 |
| 9 | Range Resources | 4,419 | 2,187 |
| 10 | Kentucky West Virginia Gas Company | 4,393 | 2,354 |
| 11 | Enervest Operating | 4,227 | 3,704 |
| 12 | Minard Run Oil Company | 3,858 | 2,239 |
| 13 | Columbia Gas Transmission | 3,853 | 330 |
| 14 | PA Gen Energy | 3,563 | 788 |
| 15 | Greenway Energy LLC | 2,919 | 2,858 |
| 16 | Seneca Resources | 2,712 | 1,650 |
| 17 | Expand Oper LLC | 2,677 | 2,628 |
| 18 | Antero Resources | 2,669 | 1,980 |
| 19 | Eastern Gas Transmission And Storage Inc. | 2,666 | 878 |
| 20 | Greylock Conventional | 2,653 | 2,627 |
| 21 | East Resources | 2,617 | 524 |
| 22 | Ows Energy LLC | 2,602 | 2,602 |
| 23 | Ppp Future Development | 2,529 | 2,307 |
| 24 | CNX Gas | 2,500 | 1,209 |
| 25 | Pillar Energy | 2,466 | 2,412 |
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Well counts compiled by Buckhead Energy from state oil & gas regulator records (data as of 2026-09-03); reflect wells where each company is the current operator of record in the Appalachian Basin (Marcellus & Utica). Informational only.
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