Private company
Who owns MarkWest Utica EMG, L.L.C.
One company in the researched set discloses a stake in MarkWest Utica EMG, L.L.C., worth $890m between them. MarkWest Utica EMG, 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 Utica EMG, L.L.C. - Profile
- Type
- joint venture
- Based in
- United States
- Founded
- 2011
MarkWest Utica EMG is a midstream joint venture formed in December 2011 between MarkWest Energy Partners (since absorbed into MPLX) and The Energy and Minerals Group, a Houston private equity manager, to build gathering, processing and natural gas liquids infrastructure for producers in the Utica shale of eastern Ohio. Its assets centre on two cryogenic processing complexes, Cadiz in Harrison County and Seneca in Noble County, together with several hundred miles of gathering pipeline, serving drillers including Antero Resources, Gulfport Energy, Rex Energy and PDC Energy under long term fee based contracts. The venture separates wet gas into residue gas and NGLs for fractionation and onward transport, and it also holds an interest in Ohio Gathering Company, which runs large diameter gathering trunklines across the play.
Source
MarkWest Utica EMG, 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 Utica EMG develops Utica Shale midstream system (Offshore Technology), MarkWest Utica EMG and Ohio Gathering Company agreements with American Energy Utica (Energy & Minerals Group) and MarkWest, Ohio Gathering to provide Utica gas services (Oil & Gas Journal). 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 rather than consolidated 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 Utica EMG, L.L.C. where a holder stated one, and are missing where no holder did.