Westlake

WLK • NYSE

Westlake is a chemicals - specialty company in the basic materials sector on NYSE, led by Jean-Marc Gilson, with a market cap of $9.5B. As of Q3 2025, 32% of shares are held by 294 institutional investors, with Orbis Allan Gray Ltd as the largest holder at 3.05%.

President and Chief Executive OfficerJean-Marc Gilson

Market Cap$9.5B

Chemicals - Specialty

Basic Materials

Employees15.5K

Websitewestlake.com

Country

United States of America

Overview

Overview of institutional ownership in WLK as of Q3 2025 with a market cap of $9.9B

All Institutions

Institutions: 294
Value Held: $3.2B
Shares Held: 41.5M
Avg Position: $10.9M
Median Position: $588.8K

Hedge Funds

Hedge Funds: 47
Value Held: $541.2M
Shares Held: 7.0M
Avg Position: $11.5M
Median Position: $4.8M

Ownership Breakdown

Institutional (non-HF)

26.84%

$2.7B

Hedge Funds

5.48%

$541.2M

Retail & Other

67.68%

$6.7B

Based on market cap of $9.9B as of Q3 2025. Institutional (non-HF) excludes hedge funds to avoid double counting.

Biggest Investors

Institutions with the largest positions in WLK as of Q3 2025

Institution	Key People	Position Value	Ownership	Owned Since	Total AUM (Long)
O Orbis Allan Gray Ltd RIA/Wealth	Don Lynn Ray Managing Partner	$301.6M 1.29% of portfolio	3.05% 3.9M shares	Q3 2025 Held for 2 months	$23.3B
VANGUARD GROUP INC Institution	Salim Ramji CEO	$265.1M 0.00% of portfolio	2.68% 3.4M shares	≤ Q2 2013 Held for 12y 5m+	$6.69T
B BlackRock, Inc. Institution	-	$245.5M 0.00% of portfolio	2.48% 3.2M shares	≤ Q2 2013 Held for 12y 5m+	$5.67T
VICTORY CAPITAL MANAGEMENT INC Long Only Manager	David Craig Brown CEO	$220.9M 0.14% of portfolio	2.24% 2.9M shares	Q3 2013 Held for 12y 2m	$158.22B
PRICE T ROWE ASSOCIATES INC /MD/ Long Only Manager	Robert W Sharps President	$170.2M 0.02% of portfolio	1.72% 2.2M shares	≤ Q2 2013 Held for 12y 5m+	$912.31B
B BRANDES INVESTMENT PARTNERS, LP Long Only Manager	Oliver Michael Murray CEO	$119.3M 0.96% of portfolio	1.21% 1.5M shares	Q1 2025 Held for 8 months	$12.5B
DIMENSIONAL FUND ADVISORS LP Long Only Manager	David Paul Butler CEO	$100.2M 0.02% of portfolio	1.01% 1.3M shares	≤ Q2 2013 Held for 12y 5m+	$466.32B
STATE STREET CORP Institution	Ronald P. O'Hanley CEO	$99.8M 0.00% of portfolio	1.01% 1.3M shares	≤ Q2 2013 Held for 12y 5m+	$2.88T
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	Kenneth Cordele Griffin CEO	$92.5M 0.08% of portfolio	0.94% 1.2M shares	≤ Q2 2013 Held for 12y 5m+	$122.08B
GOLDMAN SACHS GROUP INC Institution	David M. Solomon CEO	$81.0M 0.01% of portfolio	0.82% 1.1M shares	≤ Q2 2013 Held for 12y 5m+	$691.34B

Net Capital Flow

Institutional buying and selling activity for WLK in Q3 2025

Traded: +$303.4M
Buyers: 156
Sellers: 154
Total Bought: +$823.6M
Total Sold: −$520.3M
Avg Position: $9.2M

Biggest Buyers

Institution	Net Bought	Current Position
O Orbis Allan Gray Ltd RIA/Wealth	+$301.6M +3.9M shares	$301.6M 3.9M shares
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	+$91.6M +1.2M shares	$92.5M 1.2M shares
Holocene Advisors, LP Hedge Fund•Long/Short	+$53.6M +696.0K shares	$65.8M 854.2K shares
THOMPSON SIEGEL & WALMSLEY LLC Long Only Manager	+$34.0M +441.3K shares	$34.0M 441.3K shares
BALYASNY ASSET MANAGEMENT LLC Hedge Fund•Multi-Strategy	+$30.5M +395.9K shares	$36.7M 475.7K shares
CAISSE DE DEPOT ET PLACEMENT DU QUEBEC Fund of Funds	+$28.4M +368.3K shares	$28.4M 368.3K shares
MORGAN STANLEY RIA/Wealth	+$27.2M +353.1K shares	$62.9M 815.6K shares
Merewether Investment Management, LP Hedge Fund•Sector	+$20.7M +268.4K shares	$20.7M 268.4K shares
UBS GLOBAL ASSET MANAGEMENT AMERICAS INC Long Only Manager	+$20.5M +265.4K shares	$70.7M 917.3K shares
R ROYAL BANK OF CANADA Institution	+$12.6M +163.1K shares	$29.4M 381.6K shares

Biggest Sellers

Institution	Net Sold	Current Position
FMR LLC Institution	−$100.2M −1.3M shares	$24.2M 314.4K shares
VICTORY CAPITAL MANAGEMENT INC Long Only Manager	−$65.9M −855.4K shares	$220.9M 2.9M shares
MILLENNIUM MANAGEMENT LLC Hedge Fund•Multi-Strategy	−$52.7M −683.5K shares	$8.2M 106.3K shares
Engineers Gate Manager LP Hedge Fund•Quant	−$26.7M −351.0K shares	Sold Off 0 shares
A ANTIPODES PARTNERS Ltd Hedge Fund•Long/Short	−$20.6M −267.3K shares	$42.8M 555.9K shares
N Nuveen, LLC Institution	−$15.4M −199.6K shares	$52.9M 686.5K shares
BANK OF MONTREAL /CAN/ Institution	−$14.3M −185.9K shares	$3.5M 45.2K shares
D D. E. Shaw & Co., Inc. Institution	−$14.1M −183.0K shares	$12.3M 160.0K shares
I Ilex Capital Partners LLP Institution	−$12.6M −162.9K shares	$8.5M 110.7K shares
B BlackRock, Inc. Institution	−$11.0M −143.0K shares	$245.5M 3.2M shares

Entry and Exit Activity

Institutions that initiated new positions or completely exited WLK in Q3 2025

New Positions: 12
New Value: $16.4M
Exited Positions: 53
Exited Value: $88.6M

New Positions

Institution	Position Value
L Lloyd Harbor Capital Management, LLC Hedge Fund•Multi-Strategy	$8.5M 110.0K shares
Z Zimmer Partners, LP Hedge Fund•Long/Short	$6.9M 90.0K shares
Board of the Pension Protection Fund RIA/Wealth	$732.1K 9.5K shares
W WILEY BROS.-AINTREE CAPITAL, LLC Institution	$233.3K 3.0K shares
Point72 Europe LLP Digital Asset Manager	$28.7K 373.0 shares
CULLEN/FROST BANKERS, INC. Institution	$10.2K 133.0 shares
FIRST HORIZON NATIONAL CORP RIA/Wealth	$3.7K 48.0 shares
R Root Financial Partners, LLC RIA/Wealth	$2.9K 37.0 shares
Sontag Advisory, LLC RIA/Wealth	$2.9K 37.0 shares
C Cromwell Holdings LLC Institution	$155.0 2.0 shares

Exited Positions

Institution	Previous Position
Engineers Gate Manager LP Hedge Fund•Quant	$26.7M 351.0K shares
Q Qube Research & Technologies Ltd Institution	$10.2M 134.6K shares
M Man Group plc Institution	$9.4M 124.2K shares
I ING GROEP NV Institution	$8.5M 111.4K shares
ExodusPoint Capital Management, LP Hedge Fund•Multi-Strategy	$6.9M 90.6K shares
JCP Investment Management, LLC Hedge Fund•Event Driven	$4.0M 53.0K shares
T TEXAS PERMANENT SCHOOL FUND Institution	$3.1M 41.4K shares
Y Y-Intercept Ltd Institution	$2.5M 32.5K shares
STATE OF WISCONSIN INVESTMENT BOARD RIA/Wealth	$2.0M 26.0K shares
H HSBC HOLDINGS PLC Institution	$2.0M 25.8K shares

Options Activity

Institutions with the largest Call and Put options positions in WLK as of Q3 2025

Call Positions: 9
Call Value: $17.3M
Put Positions: 10
Put Value: $57.7M

Call Positions

Institution	Position Value
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$7.0M 913.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$4.3M 555.0 contracts
T Twin Tree Management, LP Hedge Fund•Vol Arbitrage	$2.2M 286.0 contracts
J JANE STREET GROUP, LLC Institution	$1.4M 187.0 contracts
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy	$1.3M 165.0 contracts
Walleye Trading LLC RIA/Wealth	$662.7K 86.0 contracts
TUDOR INVESTMENT CORP ET AL Hedge Fund•Multi-Strategy	$400.7K 52.0 contracts
D D. E. Shaw & Co., Inc. Institution	- - contracts
P Polymer Capital Management LLC Hedge Fund•Multi-Strategy	- - contracts

Put Positions

Institution	Position Value
BARCLAYS PLC Institution	$36.3M 4.7K contracts
N NOMURA HOLDINGS INC Institution	$10.8M 1.4K contracts
J JANE STREET GROUP, LLC Institution	$4.3M 558.0 contracts
Walleye Trading Advisors, LLC Hedge Fund•Multi-Strategy	$2.1M 279.0 contracts
Walleye Trading LLC RIA/Wealth	$1.5M 192.0 contracts
CITADEL ADVISORS LLC Hedge Fund•Multi-Strategy	$1.4M 176.0 contracts
TUDOR INVESTMENT CORP ET AL Hedge Fund•Multi-Strategy	$524.0K 68.0 contracts
W WOLVERINE TRADING, LLC Institution	$477.5K 62.0 contracts
SUSQUEHANNA INTERNATIONAL GROUP, LLP Private Equity	$331.4K 43.0 contracts
P Polymer Capital Management LLC Hedge Fund•Multi-Strategy	- - contracts

Most Committed Institutions

Institutions with WLK as the highest % of their portfolio as of Q3 2025

Institution	Key People	Portfolio Weight	Ownership	Owned Since	Total AUM (Long)
I Impala Asset Management LLC Hedge Fund•Long/Short	Robert James Bishop CEO	6.52% $8.9M	0.09% 115.0K shares	Q3 2025 Held for 2 months	$136.0M
L Lloyd Harbor Capital Management, LLC Hedge Fund•Multi-Strategy	Timothy James Rotolo CEO	4.07% $8.5M	0.09% 110.0K shares	Q3 2025 Held for 2 months	$208.4M
Walnut Level Capital LLC Hedge Fund•Sector	Charles William Antrim CIO	3.13% $4.4M	0.04% 57.7K shares	Q3 2024 Held for 1y 2m	$141.9M
R ROBOTTI ROBERT Institution	-	2.39% $14.0M	0.14% 181.9K shares	Q4 2015 Held for 9y 11m	$585.9M
O Orbis Allan Gray Ltd RIA/Wealth	Don Lynn Ray Managing Partner	1.29% $301.6M	3.05% 3.9M shares	Q3 2025 Held for 2 months	$23.3B
T THOMIST CAPITAL MANAGEMENT, LP Hedge Fund•Long/Short	Brian Kuzma Managing Partner	1.11% $3.6M	0.04% 46.2K shares	Q3 2024 Held for 1y 2m	$320.9M
A ANTIPODES PARTNERS Ltd Hedge Fund•Long/Short	Andrew Findlay CEO	0.96% $42.8M	0.43% 555.9K shares	Q2 2025 Held for 5 months	$4.5B
B BRANDES INVESTMENT PARTNERS, LP Long Only Manager	Oliver Michael Murray CEO	0.96% $119.3M	1.21% 1.5M shares	Q1 2025 Held for 8 months	$12.5B
Board of the Pension Protection Fund RIA/Wealth	Michael John Martinez Managing Partner	0.72% $732.1K	0.01% 9.5K shares	Q3 2025 Held for 2 months	$102.1M
THOMPSON SIEGEL & WALMSLEY LLC Long Only Manager	Brett Phelan Hawkins CIO	0.56% $34.0M	0.34% 441.3K shares	Q3 2025 Held for 2 months	$6.1B

Hedge Fund Spotlight

Discover hedge funds investing in WLK

Walnut Level Capital LLC

Hedge Fund • Sector

Portfolio ManagerCharles William Antrim

Portfolio Value: $141.9M
Positions: 31
Last Reported: Q3 2025

Sector Allocation

Position in Westlake

Market Value: $4.4M
Shares Held: 57.7K
Portfolio Weight: 3.13%
Owned Since: 2024-Q3

Top Holding	Sector	Market Value	Weight
1 Andersons Inc. ANDE	Food Distribution Consumer Defensive	$22.9M	16.12%
2 Methanex MEOH	Chemicals Basic Materials	$15.8M	11.12%
3 Mission Produce, Inc. AVO	Food Distribution Consumer Defensive	$12.9M	9.11%