Alberta Hub Joint Venture

Allis Chalmers, Inc. / STRATA

Aspen Pipeline

Aspen Pipeline Fund II

Azure Midstream

Natural Gas Gathering

Bayard Drilling Technologies

Bluejack Energy Solutions

Water Logistics

Caliche Development Partners

Salt Cavern Liquids Storage

Canadian Midstream Services

Caprock Midstream

Ceritas Energy Fund II

Natural Gas Processing

Ceritas Holdings

CES Acquisition Corp.

C&J Energy Services

Clear Creek Energy Services

Clipper Windpower

Costar Midstream

Dornick Hills Midstream

Enerven Compression

Falcon Gas Storage Company

Forrest Drilling Company

Frontier Field Services

Frontier Midstream

Frontier Midstream Solutions Fund III

Frontier Midstream Solutions Fund IV

Crude Oil Gathering and Transportation

High Sierra Energy

Hoover Energy Partners

Kanata Energy Group

Natural Gas Gathering & Processing

Lakewood Midstream

Crude Oil Logistics and Water Disposal

Laser Midstream Energy Company

Laser Midstream Energy Company Fund II

Liberty Midstream Services

Midstream Energy Services

MV Midstream

Crude Oil and Natural Gas Gathering and Processing

Pinnacle Midstream II

Gathering & Processing

Pinnacle Natural Gas Company

Prism Midstream

Liquids Treating and Stabilization

Pueblo Midstream Gas Corporation

Rio Midstream Partners

Santa Fe Midstream

Natural Gas Gathering and Processing

Spectrum Field Services

Spectrum Rotary Compression

Stonehenge Energy Resources

Sulphur River Gathering

Texas Energy Midstream

The Seminole Group

Tivoli Midstream

Storage

Tobin International

TransEdge Energy

Tristate Midstream

Tristate Midstream Fund II & III

Gathering & Processing

Velocity Midstream Partners

Velocity Midstream Partners Fund II

Vesta Midstream Partners

Natural Gas Gathering