Private company
Who owns Saudi Ethylene & Polyethylene Company
One company in the researched set discloses a stake in Saudi Ethylene & Polyethylene Company, none of it sized by anyone who discloses it. Saudi Ethylene & Polyethylene Company 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.
Saudi Ethylene & Polyethylene Company - Profile
- Type
- joint venture
- Based in
- Saudi Arabia
- Founded
- 2006
Saudi Ethylene and Polyethylene Company, usually shortened to SEPC, operates an integrated petrochemical complex in Jubail Industrial City on Saudi Arabia's Gulf coast. It was established in May 2006 by Tasnee Sahara Olefins Company and the Basell arm of LyondellBasell, with the Saudi partners supplying the site, feedstock access and most of the capital and Basell contributing polyolefin process technology. The complex runs a cracker that has produced 1 million tonnes a year of ethylene and 285,000 tonnes a year of propylene since August 2008, feeding two downstream plants that each make 400,000 tonnes a year of high density and low density polyethylene. A cracker expansion worth about 500 million dollars, awarded to South Korea's SGC E&C in late 2023, lifts olefins output by 18 percent and entered pilot production in 2026.
Source
Saudi Ethylene & Polyethylene Company 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 SEPC lets contract for Al-Jubail ethylene cracker expansion project (Oil & Gas Journal), Tasnee petrochemicals product page and Tasnee completes $500-MM ethylene expansion project in Saudi Arabia (Hydrocarbon Processing, July 2026). 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.
- LyondellBasell Industries N.V.. Exhibit 21.1 to the FY2025 10-K (filed 20 Feb 2026) states that Basell Moyen Orient Investissements SAS owns a 25% interest in Saudi Ethylene & Polyethylene Company. This is a 25 percent ownership interest, written here as the number 25, not as a fraction of 100. Cross-checked against Note 10 (Equity Investments) of the same 10-K, which lists 'Saudi Ethylene & Polyethylene Company Ltd.' at 25.00% ownership as of both 31 Dec 2025 and 31 Dec 2024, confirming the figure independently within the same filing. LyondellBasell's balance sheet carries a single combined 'Equity investments' line ($3,963 million at 31 Dec 2025 per the 10-K; $3,875 million at 30 Jun 2026 per the most recent 10-Q) covering all equity-method investees together, so no individual carrying value is disclosed for this venture: value_usd is null. sourcesource 2
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 Saudi Ethylene & Polyethylene Company where a holder stated one, and are missing where no holder did.