Company · Ownership research

WESTLAKE CORP WLK

CIK 0001262823 · CUSIP 960413102

Insider trading Initial holdings Institutional holders

Quarter-end disclosures, not live holdings.

Several CUSIPs are reported for this company; this page shows CUSIP 960413102 (WLK), not CUSIP 960413902 (WLK), CUSIP 960413952 (WLK), and does not merge CUSIPs.

This page lists the top 20 of 307 rows by value; the complete set is available through the API.

Some filings reported values in thousands; those figures were scaled ×1,000 to dollars.

Top 20 institutions

Weight means this stock's share of the manager's own portfolio.

By reported value

#	Manager	Value	Manager weight	Change vs prior	Source
01	VICTORY CAPITAL MANAGEMENT INC CIK 1040188 · View history	$282.59M 3,721,742 shares	0.18%	-178.28K(-4.60%)Reduced	SEC filing ↗ Aug 13, 2025	▾
02	VANGUARD GROUP INC CIK 102909 · View history	$267.49M 3,522,810 shares	0.00%	-27.50K(-0.80%)Reduced	SEC filing ↗ Aug 11, 2025	▾
03	BlackRock, Inc. CIK 2012383 · View history	$252.75M 3,328,696 shares	0.00%	-331.71K(-9.10%)Reduced	SEC filing ↗ Aug 12, 2025	▾
04	PRICE T ROWE ASSOCIATES INC /MD/ CIK 80255 · View history	$156.31M 2,058,588 shares	0.02%	+2.04M(+9,618.10%)Added	SEC filing ↗ Aug 14, 2025	▾
05	FMR LLC CIK 315066 · View history	$122.65M 1,615,238 shares	0.01%	+66.37K(+4.30%)Added	SEC filing ↗ Aug 14, 2025	▾
06	BRANDES INVESTMENT PARTNERS, LP CIK 1015079 · View history	$110.62M 1,456,871 shares	1.00%	+1.04M(+246.00%)Added	SEC filing ↗ Aug 13, 2025	▾
07	STATE STREET CORP CIK 93751 · View history	$105.71M 1,392,227 shares	0.00%	-237.88K(-14.60%)Reduced	SEC filing ↗ Aug 14, 2025	▾
08	NORGES BANK CIK 1374170 · View history	$104.31M 1,373,816 shares	0.01%	+1.00M(+272.40%)Added	SEC filing ↗ Aug 13, 2025	▾
09	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$96.83M 1,275,169 shares	0.02%	+335.50K(+35.70%)Added	SEC filing ↗ Aug 12, 2025	▾
10	GOLDMAN SACHS GROUP INC CIK 886982 · View history	$80.41M 1,058,943 shares	0.01%	+17.75K(+1.70%)Added	SEC filing ↗ Aug 14, 2025	▾
11	JACOBS LEVY EQUITY MANAGEMENT, INC CIK 884414 · View history	$74.81M 985,258 shares	0.29%	+209.46K(+27.00%)Added	SEC filing ↗ Aug 14, 2025	▾
12	Nuveen, LLC CIK 1871926 · View history	$67.28M 886,128 shares	0.02%	+156.61K(+21.50%)Added	SEC filing ↗ Aug 12, 2025	▾
13	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. CIK 1705339 · View history	$64.10M 844,130 shares	0.12%	-9.70K(-1.10%)Reduced	SEC filing ↗ Aug 14, 2025	▾
14	ANTIPODES PARTNERS Ltd CIK 1652442 · View history	$62.51M 823,169 shares	1.94%	+823.17KNew	SEC filing ↗ Aug 5, 2025	▾
15	MILLENNIUM MANAGEMENT LLC CIK 1273087 · View history	$59.97M 789,846 shares	0.05%	-111.38K(-12.40%)Reduced	SEC filing ↗ Aug 14, 2025	▾
16	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC CIK 861177 · View history	$49.49M 651,826 shares	0.01%	+280.65K(+75.60%)Added	SEC filing ↗ Aug 14, 2025	▾
17	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$43.61M 574,231 shares	0.00%	-2.55K(-0.40%)Reduced	SEC filing ↗ Aug 8, 2025	▾
18	Allspring Global Investments Holdings, LLC CIK 1890906 · View history	$41.91M 520,737 shares	0.07%	-31.03K(-5.60%)Reduced	SEC filing ↗ Jul 25, 2025	▾
19	VOLORIDGE INVESTMENT MANAGEMENT, LLC CIK 1556921 · View history	$39.50M 520,256 shares	0.15%	+173.29K(+49.90%)Added	SEC filing ↗ Aug 14, 2025	▾
20	MORGAN STANLEY CIK 895421 · View history	$35.12M 462,488 shares	0.00%	+199.93K(+76.10%)Added	SEC filing ↗ Aug 14, 2025	▾

Showing 20 / 307 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

307

Cancelled or null records excluded

Disclosed shares

39,372,242

Not deduplicated across managers

Disclosed value

$2.99B

Not market cap or free float

Reporting institutions by quarter

Counts also change with data coverage and reporting entities; they do not measure net buying. Distinct managers with a live stock row in this CUSIP; totals may include overlapping filings and are not a share of the company.

WESTLAKE CORP · Q2 2025

Explore all 307 reporting institutions.

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Sources, coverage & how to read this data

Figures are as reported to the SEC and merged with later amendments where Akkru could match them. Preview limits apply to what is listed, not to the totals, which come from the complete reported data. Nothing is zero-filled: a missing quarter or month is shown as missing.