Private company
Who owns WPC Parent, LLC
One company in the researched set discloses a stake in WPC Parent, LLC, worth $273m between them. WPC Parent, LLC 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.
WPC Parent, LLC - Profile
- Type
- joint venture
- Based in
- United States
- Founded
- 2024
WPC Parent is a Texas natural gas pipeline holding venture created on 29 May 2024, when the owners of Whistler Pipeline, LLC rolled their membership interests into a new company and an affiliate of Enbridge joined by contributing cash and the Rio Bravo Pipeline project. Its partners are WhiteWater, the Austin based midstream developer backed by I Squared Capital, which operates the systems, together with MPLX and Enbridge. The portfolio moves gas out of the Permian Basin of West Texas to the South Texas Gulf Coast and the LNG export terminals there: the Whistler mainline, the Rio Bravo Pipeline serving the Rio Grande LNG project, majority interests in the Blackcomb Pipeline (about 365 miles of 42 inch pipe designed for 2.5 billion cubic feet a day) and the ADCC lateral into Corpus Christi, and a half interest in the Waha gas storage facility.
Source
WPC Parent, LLC 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 Marathon Petroleum Corporation Form 10-K for 2025 (SEC), Blackcomb Pipeline Reaches Final Investment Decision (PR Newswire) and WhiteWater-led JV takes FID on new Permian basin gas pipeline (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. 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 WPC Parent, LLC where a holder stated one, and are missing where no holder did.