- Alta Resources, LLC
- BKV Operating, LLC
- Cabot Oil and Gas Corporation
- Chesapeake Energy Corporation
- Chevron
- Chief Oil and Gas, LLC
- CNX Resources Corporation
- Columbia Gas of Pennsylvania (NiSource)
- Dominion Energy
- DTE Midstream
- EdgeMarc Energy Holdings, Inc.
- Energy Transfer Partners
- EOG Resources
- EQT Corporation
- Equitrans Midstream Corporation
- Greylock Energy, LLC
- Hilcorp Energy Company
- Huntley & Huntley Energy Exploration, LLC
- JKLM Energy, LLC
- Laurel Mountain Energy, LLC
- MarkWest Energy Partners, L.P.
- Montage Resources
- PennEnergy Resources, LLC
- Pennsylvania General Energy Company, LLC
- Peoples Natural Gas
- Range Resources Corporation
- REPSOL
- Seneca Resources Company, LLC
- Shell Appalachia
- Southwestern Energy
- Stonehenge Energy Resources II, LLC
- TC Energy
- UGI Energy Services
- Williams
- XTO Energy
