Westlake Corporation (WLK) Institutional Ownership & Insider Trading

358 institutions reported holding Westlake Corporation shares in 13F filings for the quarter ended 2026-06-30, according to EquiReason's reading of their SEC filings. 9 insider trades on Form 4 since 2025-10-01.

Source: SEC EDGAR filings · figures as of 2026-06-30 · read by EquiReason

WLKWestlake CorporationFollow WLK — free

Specialty Chemicals · Basic Materials

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Market cap: 8.3B
P/E TTM: —
Dividend yield: 3.3%
52-week: —
Next earnings: 4 Nov, in 11 days

Institutions · all 13F filers

quarter to 30 Jun 2026 · filers in both quarters

358 institutions held 31.1% of the shares. Across filers that reported both quarters, shares held changed -10.4%.

Largest moves, shares (millions)

Institutional flow by quarter

net shares added or trimmed, millions · filers in both quarters

Quarter	Holders	Shares held, M	Change	Increased	New	Decreased	Closed
Jun 26	358	40	-10.4%	100	73	115	54
Mar 26	333	44	-3.6%	105	76	79	38
Dec 25	294	46	+11.1%	86	45	105	52
Sep 25	293	42	+9.4%	86	45	94	43
Jun 25	303	39	+5.8%	110	38	95	85
Mar 25	353	36	+2.3%	129	31	98	53
Dec 24	370	35	+4.0%	121	24	118	56
Sep 24	395	33	-2.2%	131	53	111	40

Westlake Corporation — questions

Who owns Westlake Corporation stock?: 358 institutions reported Westlake Corporation shares in 13F filings for the quarter ended 2026-06-30. The largest: BlackRock, Inc. (2.6%), Capital World Investors (2.2%), PRICE T ROWE ASSOCIATES INC /MD/ (1.7%).
Are Westlake Corporation insiders buying or selling?: 9 insider trades on Form 4 since 2025-10-01; the full list, with dates, people and plan status, is on this page.

Every figure on this page comes from Westlake Corporation's own SEC filings — see them on SEC EDGAR. Price data is licensed and shown only inside the product.

How these figures are read: methodology · EquiReason.

Important information. Figures on this page are taken from filings submitted to the U.S. Securities and Exchange Commission (SEC) and processed automatically by EquiReason. They may contain errors, omissions or delays, and EquiReason makes no representation or warranty as to their accuracy, completeness or timeliness. Always verify figures against the original filing on SEC EDGAR before relying on them.

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