$WLK

$65.31 +$0.75 (1.16%) Close

$WLK Overview Financial Statements SEC Filings Executives News Red Flags Capital Raising Ownership Insider Transactions Congressional Trades

Ownership

13F as of Q2 2026 · 127.8M shares outstanding

Who owns WLK?

By type of holder

Institutions 100.0% Insiders 0.0% Everyone else 0.0%

Concentration Top 10 holders own 130.1%

Alps Advisors Inc 28.7% · Invesco Ltd. 24.5%

Institutional ownership

100.0%

0 pts vs last qtr

Institutional holders

1,312

+101 vs last qtr

Net shares bought

+7.5M

by institutions in Q2 2026

New / sold out

203 / 102

positions opened vs closed

How is ownership changing?

Institutions, last 8 quarters

Biggest buyers in Q2 2026

Morgan Stanley +16.8M
FMR LLC +2.0M

Biggest sellers in Q2 2026

Orbis Allan Gray Ltd −3.1M
Tortoise Capital Advisors, L.L.C. −2.3M

Who is planning to sell?

Notices of proposed sale, last 12 months

$8.32M

4 notices from 3 people

Shares covered

91.4K

0.07% of the company

Arranged in advance

of the value is under a 10b5-1 plan

Under a 10b5-1 plan No plan

Largest proposed sellers

Mark Bender Officer $4.85M
Albert Y Chao Officer $3M

Every notice on Red Flags →

A Form 144 is notice of a planned sale, not the sale itself. What insiders actually sold is on Insider Transactions.

Is your stake being diluted?

Diluted share count, FY2016–FY2025

−1.3%

−0.15% a year

Each share's claim on the business

+1.3%

grew without buying or selling a share

Spent on buybacks vs paid in stock

$534M vs $305M

over 10 fiscal years

Diluted shares, split-adjusted

Buybacks Stock-based comp

How patient are the owners?

Institutional shares by how long they've been held

5+ years69% 3–5 years16% 1–3 years11% Under 1 year5%

Quarterly turnover

9.3%

of institutional shares changed hands

Top 10 managers, median time held

5 years

Super Investors

Investment managers reporting WLK on Form 13F

Holder	Shares	% of company	Change vs last qtr	Held since	% of their book
AA Alps Advisors Inc	36.6M	28.67%	−2.0M (−5.2%)	2022	7.5%
Shares held by quarter Peak holding38.6M (Q1'26) Change over 8 quarters+8.3M Share of the company28.670% Alps Advisors Inc's full portfolio →
I Invesco Ltd.	31.3M	24.46%	+106.2K (+0.3%)	≤2021	0.2%
Shares held by quarter Peak holding32.6M (Q1'25) Change over 8 quarters+3.0M Share of the company24.460% Invesco Ltd.'s full portfolio →

Alps Advisors Inc

36.6M

% of company

28.67%

Change vs last qtr

−2.0M (−5.2%)

Held since

2022

Invesco Ltd.

31.3M

% of company

24.46%

Change vs last qtr

+106.2K (+0.3%)

Held since

≤2021

28 more super investors behind a free account

See every manager holding Westlake Corp, how their position has changed, and how long they've held it.

Institutional Funds

Mutual funds and ETFs reporting WLK on Form N-PORT; together they hold 130.3% of the company

Fund	Position value	Shares	% of company	% of the fund	As of
AM Alerian MLP ETF Alps ETF Trust	$1.65B	38.6M	30.19%	13.63%	May 31, 2026
VT Vanguard Total Stock Market Index Fund Vanguard Index Funds	$1.54B	5.2M	4.09%	0.07%	June 30, 2026

Alerian MLP ETF

Alps ETF Trust

Position value

$1.65B

% of company

30.19%

% of the fund

13.63%

As of

May 31, 2026

Vanguard Total Stock Market Index Fund

Vanguard Index Funds

Position value

$1.54B

% of company

4.09%

% of the fund

0.07%

As of

June 30, 2026

23 more funds behind a free account

See every fund holding Westlake Corp and how much of the fund the position is.

Insiders and 5%+ holders

From Forms 3/4/5 and Schedules 13D/G

Holder	Shares	% of company	Change vs last qtr	8 quarters	Held since	% of their book
EL Ederington L. Benjamin Insider	80.2K	0.06%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.060% Ederington L. Benjamin's insider activity →
BM Bender Mark Steven Insider	35.9K	0.03%	—	—	—	—
Insider holdings come from Form 3/4/5 filings, which are not quarterly. Share of the company0.030% Bender Mark Steven's insider activity →

Ederington L. Benjamin

Insider

80.2K

% of company

0.06%

Change vs last qtr

—

Held since

—

Bender Mark Steven

Insider

35.9K

% of company

0.03%

Change vs last qtr

—

Held since

—

10 more holders behind a free account

See every insider and 5%+ holder of Westlake Corp.

Comments