Private company
Who owns Saudi Polyolefins Company
One company in the researched set discloses a stake in Saudi Polyolefins Company, none of it sized by anyone who discloses it. Saudi Polyolefins 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 Polyolefins Company - Profile
- Type
- joint venture
- Based in
- Saudi Arabia
- Founded
- 2001
Saudi Polyolefins Company runs a propylene and polypropylene plant in Jubail Industrial City, Saudi Arabia. It was established in July 2001 by the Saudi industrial group Tasnee and by Basell, now part of LyondellBasell, with the Saudi side providing the site, propane feedstock and financing and the Basell side providing polypropylene process technology and marketing reach. Its two plants started up in July 2004 and produce 450,000 tonnes a year of propylene and polypropylene, with polypropylene capacity raised from 455,000 tonnes to 720,000 tonnes a year in May 2009, which puts it among the largest polypropylene units of its kind. The company is registered in Saudi Arabia and sells resin into domestic and export markets.
Source
Saudi Polyolefins 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 Tasnee petrochemicals product page and LyondellBasell Industries Form 10-K Exhibit 21, list of subsidiaries and joint ventures as of 31 December 2025. 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 Holdings Middle East GmbH owns a 25% interest in Saudi Polyolefins 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 Polyolefins Company' 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 Polyolefins Company where a holder stated one, and are missing where no holder did.