Private company
Who owns Martinez Renewables LLC
One company in the researched set discloses a stake in Martinez Renewables LLC, worth $1.06bn between them. Martinez Renewables 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.
Martinez Renewables LLC - Profile
- Type
- joint venture
- Based in
- United States
- Founded
- 2022
Martinez Renewables is a 50/50 joint venture between Marathon Petroleum and the Finnish refiner Neste that owns the converted renewable fuels plant at Martinez, California, in the San Francisco Bay Area. The site was formerly a Marathon crude oil refinery and was rebuilt to process waste fats, oils and greases into renewable diesel, with an on site pretreatment unit that cleans the feedstock before conversion. Full nameplate capacity is about 730 million US gallons (roughly 2.1 million tonnes) a year, reached at the end of 2024. Marathon executes the project and operates the facility, both partners source raw materials, and the output is divided evenly, with each partner marketing its half under its own brand.
Source
Martinez Renewables 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 Neste finalizes transaction to establish a joint venture for production of renewable fuels with Marathon Petroleum, Marathon Petroleum announces joint venture for Martinez Renewable Fuels Project with Neste and Marathon partnering with Neste on Martinez refinery-to-renewables project (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. 50/50 renewable diesel joint venture with Neste Corporation at the Martinez, California refinery site, capacity 730 million gallons per year. MPC determined Martinez Renewables LLC is a variable interest entity but that MPC is not the primary beneficiary, so it is equity-method accounted rather than consolidated. 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 Martinez Renewables LLC where a holder stated one, and are missing where no holder did.