Westlake Corporation (WLK)
INDUSTRIAL ORGANIC CHEMICALS
Westlake Corporation (WLK) is listed on the New York Stock Exchange, where it has traded since August 11, 2004.
- Listed On
- the New York Stock Exchange
- Listed Since
- August 11, 2004
- Employees
- 14,600
- Market Cap
- $8.0B
About Westlake Corporation
Westlake is a forward-integrated commodity chemicals firm based in Houston. It began as a single low-density polyethylene plant and expanded its capabilities to include ethylene, vinyl chloride monomers, and polyvinyl chloride over the next two decades. The acquisition of Axiall in 2016 made it a North American leader in chlor-alkali and PVC. Today, Westlake has two defined segments: performance and essential materials, and housing and infrastructure products. The HIP segment began operating in 2022 following a series of acquisitions in the building products space. The firm aims to maximize the value of its chemical production by integrating with the HIP segment, realizing the higher margins of finished commercial goods.
Institutional ownership
In 13F filings for the quarter ended June 30, 2026, 349 institutions reported holding WLK, with 39.7 million shares worth $2.9 billion in aggregate. The largest reported holder was Vanguard, with 3.5 million shares worth $254.5 million. Of the 5 largest holders listed below, 1 added shares and 4 reduced their positions during the quarter.
| Institution | Shares | Value | Quarter change |
|---|---|---|---|
| Vanguard | 3,486,983 | $255M | Reduced 0.31% |
| BlackRock | 3,294,162 | $240M | Added 6.99% |
| Capital Group | 2,842,348 | $207M | Reduced 32.5% |
| T. Rowe Price | 2,206,676 | $161M | Reduced 8.34% |
| Orbis Allan Gray | 2,084,364 | $152M | Reduced 60.62% |
Form 13F is a quarterly report that institutional investment managers with at least $100 million in qualifying securities file with the SEC. It lists long positions as of the last day of the quarter and is due within 45 days of quarter end, so these holdings describe that date rather than today.
Frequently asked questions
What is WLK?
Westlake Corporation (WLK) is listed on the New York Stock Exchange, where it has traded since August 11, 2004.
Who are the largest institutional holders of WLK?
In 13F filings for the quarter ended June 30, 2026, the largest reported holders of WLK were Vanguard, BlackRock and Capital Group.
How many institutions own WLK?
349 institutions reported a position in WLK for the quarter ended June 30, 2026, worth $2.9 billion in total.
Did institutions buy or sell WLK last quarter?
Of the 5 largest reported holders, 1 added shares and 4 reduced their positions during the quarter. Every reported holder and its change is on the SentiSense ownership page for WLK.
Every reported institutional holder, plus insider and congressional trades in WLK, on SentiSense.