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Westlake

US · WLK #1657 by market cap Listed 1970
61.52 -1.87 -2.95%
Live - 5344 symbols - heartbeat 462s ago · 2026-10-08 07:35
Pre-market 61.70 +0.29%
After-hours 61.52 0.00%
Market cap
7.86B
P/B
0.90
EPS
-11.70
Reader sentiment Are you bullish or bearish on WLK?

Anonymous reader poll. Unscientific, not investment advice.

✦ Quant Ownership Signal how this is computed

Mixed / stable
  • The number of reporting institutions decreased by 2 in the most recent period (2026/Q3).
  • Total institutional ownership (as a % of shares) was little changed.

Institutional ownership

Held by institutions
104.63%
Institutions
403 -2
As of
2026/Q3 vs. prior period

Holder types

Private Company73.73%
Mutual Fund23.99%
Hedge Fund4.69%
Public Company1.29%
Individual/Insider0.89%
Government Pension Fund0.42%
Insurance Company0.20%
Sovereign Wealth Fund0.17%
Family Office/Trust0.10%

Top holders as of 2026-03-16

TTWF LP 73.09% · 93.41M sh
BlackRock 2.58% · 3.29M sh
Capital Research 2.24% · 2.86M sh
T. Rowe Price Group, Inc. 1.73% · 2.21M sh
Orbis Investment Management Limited 1.63% · 2.08M sh
Dimensional Fund Advisors 1.61% · 2.05M sh
Vanguard Portfolio Management, LLC 1.37% · 1.75M sh
Vanguard Capital Management, LLC 1.31% · 1.67M sh
Brandes Investment Partners, LP 1.23% · 1.57M sh
AQR Capital Management 1.22% · 1.56M sh

Bar length is relative to the largest holder shown here, not to 100% of the company.

Insiders

50 filings tracked · 37 buys · 13 sells

NameRoleStake
TTWF LP -- 73.09%
Albert Chao Chief Executive Officer 0.50%
James Chao Executive Chairperson 0.11%
L. Ederington Executive VP of Performance & Essential Materials, General Counsel and Chief Administrative Officer 0.06%
Mark Bender Chief Financial Officer 0.03%
Robert Buesinger Executive Vice President of Housing, Infrastructure Products, IT & Digital 0.03%
Tsung-Hung Chao Director 0.02%
Catherine Chao Nominee Director 0.02%
R. Northcutt Independent Director 0.02%
Michael Graff Independent Director 0.02%

Insider transactions most recent Form 4 filings

DateNameRoleTypeSharesPrice
2026-08-30 Tommy Darby Vice President Other Derivative Acquisition +1,791 --
2026-08-13 Mark McCollum Independent Director Other Derivative Acquisition +2,184 --
2026-08-13 Roger Cregg Director Other Derivative Acquisition +2,184 --
2026-08-13 Kimberly Lubel Independent Director Other Derivative Acquisition +2,184 --
2026-08-13 R. Northcutt Independent Director Other Derivative Acquisition +2,184 --
2026-08-13 Michael Graff Independent Director Other Derivative Acquisition +2,184 --
2026-08-13 Jeffrey Sheets Independent Director Other Derivative Acquisition +2,184 --
2026-08-13 Bhavesh Patel Director Other Derivative Acquisition +2,184 --
2026-08-13 Tsung-Hung Chao Director Other Derivative Acquisition +2,184 --
2026-08-13 Catherine Chao Nominee Director Other Derivative Acquisition +2,184 --
2026-08-13 Carolyn Sabat Nominee Director Other Derivative Acquisition +2,184 --
2026-08-10 Albert Chao Chief Executive Officer Derivative Exercise and Sale -38,873 $61.87–80.42
2026-08-07 Mark McCollum Independent Director Derivative Exercise and Retained +2,168 --
2026-08-07 Roger Cregg Director Derivative Exercise and Retained +2,168 --
2026-08-07 Kimberly Lubel Independent Director Derivative Exercise and Retained +2,168 --
2026-08-07 R. Northcutt Independent Director Derivative Exercise and Retained +2,168 --
2026-08-07 Michael Graff Independent Director Derivative Exercise and Retained +2,168 --
2026-08-07 Jeffrey Sheets Independent Director Derivative Exercise and Retained +2,168 --
2026-08-07 Tsung-Hung Chao Director Derivative Exercise and Retained +2,168 --
2026-08-07 Catherine Chao Nominee Director Derivative Exercise and Retained +2,168 --

Form 4 filings, most recent per company. "Other Derivative Acquisition" rows are mostly RSU/option vesting, not open-market buying - the Type column says which.

Quote time 2026-10-08 07:35:50 · For reference only, not investment advice and not tailored to your situation.