- Alta Resources, LLC
- BKV Operating, LLC
- Cabot Oil & Gas Corporation
- Chesapeake Energy Corporation
- Chevron
- Chief Oil & Gas, LLC
- CNX Resources Corporation
- Columbia Gas of Pennsylvania (NiSource)
- Dominion Energy
- DTE Midstream
- Energy Transfer Partners
- EOG Resources
- EQT Corporation
- Equitrans Midstream Corporation
- Greylock Energy, LLC
- Hilcorp Energy Company
- JKLM Energy, LLC
- MPLX LP
- Montage Resources Corporation
- NRG Energy
- Olympus Energy LLC
- PennEnergy Resources, LLC
- Pennsylvania General Energy Company, LLC
- Peoples Natural Gas
- Range Resources Corporation
- REPSOL
- Seneca Resources Company, LLC
- Shell Appalachia
- Southwestern Energy Company
- Stonehenge Energy Resources II, LLC
- UGI Energy Services
- Williams
- XTO Energy
