Private company
Who owns MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C.
One company in the researched set discloses a stake in MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C., worth $407m between them. MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C. is private, so no 13F reports it: a 13F covers exchange listed positions only. These figures exist because each holder disclosed the stake in its own filings.
MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C. - Profile
- Type
- joint venture
- Based in
- United States
- Founded
- 2015
MarkWest EMG Jefferson Dry Gas Gathering Company is a midstream joint venture announced in 2015 between MarkWest Energy Partners (now part of MPLX) and The Energy and Minerals Group, owned two thirds by MarkWest and one third by EMG. It was created to build and run a dry gas gathering system across northern Belmont and Jefferson counties in eastern Ohio, sized for about 2 billion cubic feet a day and expected to reach more than 250 miles of pipeline with 200,000 horsepower of compression. Ascent Resources Utica anchors the system under a fee based contract dedicating roughly 100,000 gross acres, and the system also gathers dry gas from other producers, moving it to takeaway connections including the Rockies Express, Texas Eastern and Rover pipelines.
Source
MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C. files nothing with the SEC, so none of this comes from a filer record. The description was written for this site in August 2026 from MarkWest, EMG to develop 2-bcfd Utica dry gas gathering system (Oil & Gas Journal), MarkWest Energy expanding dry gas gathering capabilities in Utica shale (Pipeline & Gas Journal) and MPLX LP Exhibit 21.1 subsidiary list, 2015 Form 10-K (SEC). The ownership figures below come from the holders' filings instead, and are sourced row by row.
The disclosed stakes
One row per position. Where a holder reports the same company in two share classes, both rows are shown rather than summed, because the class is part of a position's identity.
Where each figure comes from
A private stake has no ownership form behind it, so the source is always the holder's own filing or disclosure. Anything modelled says so, with the arithmetic.
- Marathon Petroleum Corporation, as of 31 Dec 2025. Held through MPLX. Deemed a variable interest entity of which MPLX is not the primary beneficiary, so equity-method accounted despite the majority economic interest. source
What this page is not
It is not a complete register. It lists the holders who happen to be inside the researched set and disclosed the stake themselves. A private company can have many other shareholders, and nothing here rules them out: venture investors, founders and employees usually appear in no public filing at all. Percentages are of MarkWest EMG Jefferson Dry Gas Gathering Company, L.L.C. where a holder stated one, and are missing where no holder did.