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 305 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	Orbis Allan Gray Ltd CIK 1663865 · View history	$301.64M 3,914,411 shares	1.29%	+3.91MNew	SEC filing ↗ Nov 14, 2025	▾
02	VANGUARD GROUP INC CIK 102909 · View history	$265.06M 3,439,631 shares	0.00%	-83.18K(-2.40%)Reduced	SEC filing ↗ Nov 7, 2025	▾
03	BlackRock, Inc. CIK 2012383 · View history	$245.49M 3,185,736 shares	0.00%	-142.96K(-4.30%)Reduced	SEC filing ↗ Nov 12, 2025	▾
04	VICTORY CAPITAL MANAGEMENT INC CIK 1040188 · View history	$220.88M 2,866,360 shares	0.13%	-855.38K(-23.00%)Reduced	SEC filing ↗ Nov 12, 2025	▾
05	PRICE T ROWE ASSOCIATES INC /MD/ CIK 80255 · View history	$170.16M 2,208,143 shares	0.02%	+149.56K(+7.30%)Added	SEC filing ↗ Nov 14, 2025	▾
06	BRANDES INVESTMENT PARTNERS, LP CIK 1015079 · View history	$119.34M 1,548,694 shares	0.96%	+91.82K(+6.30%)Added	SEC filing ↗ Nov 14, 2025	▾
07	DIMENSIONAL FUND ADVISORS LP CIK 354204 · View history	$100.20M 1,300,240 shares	0.02%	+25.07K(+2.00%)Added	SEC filing ↗ Nov 12, 2025	▾
08	STATE STREET CORP CIK 93751 · View history	$99.81M 1,295,242 shares	0.00%	-96.98K(-7.00%)Reduced	SEC filing ↗ Nov 14, 2025	▾
09	CITADEL ADVISORS LLC CIK 1423053 · View history	$92.54M 1,200,851 shares	0.07%	+1.19M(+9,658.30%)Added	SEC filing ↗ Nov 14, 2025	▾
10	GOLDMAN SACHS GROUP INC CIK 886982 · View history	$81.02M 1,051,397 shares	0.01%	-7.55K(-0.70%)Reduced	SEC filing ↗ Nov 14, 2025	▾
11	UBS AM, a distinct business unit of UBS ASSET MANAGEMENT AMERICAS LLC CIK 861177 · View history	$70.69M 917,273 shares	0.02%	+265.45K(+40.70%)Added	SEC filing ↗ Nov 14, 2025	▾
12	JACOBS LEVY EQUITY MANAGEMENT, INC CIK 884414 · View history	$66.33M 860,723 shares	0.26%	-124.53K(-12.60%)Reduced	SEC filing ↗ Nov 17, 2025	▾
13	MIRAE ASSET GLOBAL ETFS HOLDINGS Ltd. CIK 1705339 · View history	$65.96M 855,976 shares	0.11%	+11.85K(+1.40%)Added	SEC filing ↗ Nov 14, 2025	▾
14	Holocene Advisors, LP CIK 1700574 · View history	$65.82M 854,184 shares	0.15%	+696.03K(+440.10%)Added	SEC filing ↗ Nov 14, 2025	▾
15	MORGAN STANLEY CIK 895421 · Amended · View history	$62.85M 815,629 shares	0.00%	+353.14K(+76.40%)Added	SEC filing ↗ May 27, 2026	▾
16	Nuveen, LLC CIK 1871926 · View history	$52.90M 686,539 shares	0.01%	-199.59K(-22.50%)Reduced	SEC filing ↗ Nov 12, 2025	▾
17	GEODE CAPITAL MANAGEMENT, LLC CIK 1214717 · View history	$50.34M 653,086 shares	0.00%	+78.86K(+13.70%)Added	SEC filing ↗ Nov 12, 2025	▾
18	UBS Group AG CIK 1610520 · View history	$43.19M 560,480 shares	0.01%	+117.01K(+26.40%)Added	SEC filing ↗ Nov 13, 2025	▾
19	ANTIPODES PARTNERS Ltd CIK 1652442 · View history	$42.84M 555,904 shares	0.96%	-267.26K(-32.50%)Reduced	SEC filing ↗ Nov 10, 2025	▾
20	Allspring Global Investments Holdings, LLC CIK 1890906 · View history	$41.92M 546,151 shares	0.07%	+25.41K(+4.90%)Added	SEC filing ↗ Oct 20, 2025	▾

Showing 20 / 305 institutions. The complete set is available through the API.

Coverage & totals by quarter

Reporting institutions

305

Cancelled or null records excluded

Disclosed shares

41,559,849

Not deduplicated across managers

Disclosed value

$3.20B

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 · Q3 2025

Explore all 305 reporting institutions.

This page includes 20 of 305 reporting institutions. Log in to look up the full history beyond 3 years, use advanced screening & filtering, download CSV, and get the complete set through the Akkru API.

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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.