WHO WE ARE

Headquartered in suburban Denver, Colorado, Stonehenge was first formed in 2007 as a partnership between Energy Spectrum Capital and 3MG Enterprises (management and certain owners of Kahuna Ventures, LLC). Our first project was the creation of Keystone Midstream Services, LLC in partnership with Rex Energy and Summit Discovery Resources II, LLC in the Appalachian Basin. MarkWest Liberty Midstream & Resources, LLC acquired the system from Stonehenge in 2012.  Stonehenge II was established shortly thereafter to construct Stonehenge Appalachia (SA), a 47 mile gathering and compression system designed to support production from the Moraine East area of Butler County, PA. Stonehenge II was expanded in 2017 through the construction of a second gathering system named  Stonehenge Laurel Gathering (SLG) in partnership with its anchor shipper, Laurel Mountain Energy (LME). Stonehenge sold SA in 2022 to UGI Energy Services (UGI) and sold its share of SLG to LME in 2025 to mark a successful close to Stonehenge II.

Stonehenge is on its third iteration (Stonehenge III) which was spurred by the 2021 acquisition of Pine Run Midstream (PRM) in partnership with UGI. In 2025, Stonehenge and UGI expanded its partnership, Pine Run Gathering (PRG), through the acquisition of the Superior Midstream Appalachia assets which it renamed to Riverwest Appalachia Midstream (RAM). Today, Stonehenge continues to expand and operate the PRM and RAM systems on behalf of the PRG partnership through the highest standards of safety, reliability, and project execution while leveraging our engineering expertise, operational excellence, and financial strength.