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Westlake Corp

WLK
Exchange
NYSE
Industry
Industrial Organic Chemicals
SEC CIK
0001262823

In the last 90 days, Westlake Corp insiders filed 0 open-market purchases and 1 sale; 360 institutions reported holding it in 13F filings for Q2 2026, worth $2.90B in total; no superinvestor holds it.

13F holders, Q1 2026

Institutional positions in Westlake Corp as of Mar 31, 2026. Investment managers with $100 million or more in US stocks report their long positions on Form 13F within 45 days after each quarter ends. How 13F works

Institutional holders
339
+47 vs. Q4 2025
Shares held
44.1M
+1.84M (+4.3%) vs. Q4 2025
Total value
$5.15B
+$2.02B (+64.7%) vs. Q4 2025
New holders
93
117 more added
Sold out
46
87 more reduced

6 institutions that held it in Q4 2025 haven't filed for Q1 2026 yet. Not filing isn't selling, so they aren't counted as sold out or in the changes above.

Compare with Q4 2025: new holders, sold out and not filed yet

Holders and value by quarter

Institutions reporting WLK on Form 13F each quarter since Q1 2021, and the total value they reported. Values are as of each quarter end, so they also move with the share price.

Institutional holdersQ1 2026: 339 institutions
Q1 2021: 240 institutionsQ2 2021: 276 institutionsQ3 2021: 272 institutionsQ4 2021: 298 institutionsQ1 2022: 328 institutionsQ2 2022: 355 institutionsQ3 2022: 321 institutionsQ4 2022: 344 institutionsQ1 2023: 342 institutionsQ2 2023: 340 institutionsQ3 2023: 335 institutionsQ4 2023: 357 institutionsQ1 2024: 347 institutionsQ2 2024: 382 institutionsQ3 2024: 403 institutionsQ4 2024: 378 institutionsQ1 2025: 361 institutionsQ2 2025: 306 institutionsQ3 2025: 305 institutionsQ4 2025: 298 institutionsQ1 2026: 339 institutionsQ2 2026: 360 institutions
Value heldQ1 2026: $5.15B
Q1 2021: $3.09BQ2 2021: $3.02BQ3 2021: $3.15BQ4 2021: $3.37BQ1 2022: $4.38BQ2 2022: $3.50BQ3 2022: $3.03BQ4 2022: $3.73BQ1 2023: $4.40BQ2 2023: $4.42BQ3 2023: $4.64BQ4 2023: $5.04BQ1 2024: $5.29BQ2 2024: $4.93BQ3 2024: $5.08BQ4 2024: $4.04BQ1 2025: $3.64BQ2 2025: $2.99BQ3 2025: $3.20BQ4 2025: $3.43BQ1 2026: $5.15BQ2 2026: $2.90B
Institutions holding WLK and their total value by quarter
QuarterHoldersValue
Q2 2026360$2.90B
Q1 2026339$5.15B
Q4 2025298$3.43B
Q3 2025305$3.20B
Q2 2025306$2.99B
Q1 2025361$3.64B
Q4 2024378$4.04B
Q3 2024403$5.08B
Q2 2024382$4.93B
Q1 2024347$5.29B
Q4 2023357$5.04B
Q3 2023335$4.64B
Q2 2023340$4.42B
Q1 2023342$4.40B
Q4 2022344$3.73B
Q3 2022321$3.03B
Q2 2022355$3.50B
Q1 2022328$4.38B
Q4 2021298$3.37B
Q3 2021272$3.15B
Q2 2021276$3.02B
Q1 2021240$3.09B

Institutions, Q1 2026

Shares, value and share of portfolio for each institution holding Westlake Corp; share changes are against Q4 2025.

Institutions holding WLK in Q1 2026
InstitutionSharesValue% of portfolioChange in sharesAction
Bartlett & Co. Wealth Management LLC1$1150.00%+1New
3 Factor Indexing, LLC1$1170.00%+1New
Valued Wealth Advisors LLC1$1210.00%00.0%Unchanged
IFP Advisors, Inc2$2340.00%−38−95.0%Reduced
SBI Securities Co., Ltd.2$2340.00%+1+100.0%Added
Hughes Financial Services, LLC2$2340.00%+1+100.0%Added
Northwestern Mutual Wealth Management Co2$2340.00%+2New
Activest Wealth Management2$2340.00%+2New
Curio Wealth, LLC2$2340.00%+2New
TopTier Wealth Management, LLC3$3500.00%+3New
Investors Portfolio Services LLC4$3760.00%+4New
Dunhill Financial, LLC3$4340.00%+2+200.0%Added
Cromwell Holdings LLC4$4670.00%00.0%Unchanged
Arlington Trust Co LLC4$4670.00%+4New
Twin Peaks Wealth Advisors, LLC4$4670.00%+4New
SWAN Capital LLC5$5840.00%00.0%Unchanged
MV Capital Management, Inc.6$7010.00%+1+20.0%Added
HFM Investment Advisors, LLC6$7010.00%+5+500.0%Added
Vermillion Wealth Management, Inc.6$7010.00%+6New
American Capital Advisory, LLC7$8180.00%00.0%Unchanged
ZRC Wealth Management, LLC7$8180.00%+7New
Picton Mahoney Asset Management8$9350.00%00.0%Unchanged
Principia Wealth Advisory, LLC8$9350.00%00.0%Unchanged
Avion Wealth14$1.00K0.00%00.0%Unchanged
Penserra Capital Management LLC9$1.00K0.00%00.0%Unchanged
Creative Financial Designs Inc9$1.05K0.00%+9New
Essential Partners LLC9$1.05K0.00%+9New
DiNuzzo Private Wealth, Inc.9$1.05K0.00%+7+350.0%Added
Steward Partners Investment Advisory, LLC10$1.17K0.00%−14−58.3%Reduced
Raffa Wealth Management, LLC10$1.17K0.00%+1+11.1%Added
Bay Harbor Wealth Management, LLC12$1.40K0.00%+10+500.0%Added
Rialto Wealth Management, LLC12$1.40K0.00%+5+71.4%Added
Torren Management, LLC13$1.57K0.00%−21−61.8%Reduced
Atlas Capital Advisors LLC14$1.64K0.00%+14New
Wilkerson Advisory Group LLC16$1.87K0.00%+16New
Ogorek Anthony Joseph18$2.00K0.00%00.0%Unchanged
Clearstead Advisors, LLC18$2.10K0.00%−91−83.5%Reduced
South State Corp.18$2.10K0.00%+10+125.0%Added
AdvisorNet Financial, Inc19$2.22K0.00%00.0%Unchanged
Manchester Capital Management LLC21$2.45K0.00%00.0%Unchanged
SJS Investment Consulting Inc.22$2.57K0.00%+22New
Peterson Wealth Services23$2.69K0.00%00.0%Unchanged
CoreCap Advisors, LLC24$2.80K0.00%00.0%Unchanged
First Horizon Corp24$2.80K0.00%00.0%Unchanged
True Wealth Design, LLC27$3.15K0.00%+9+50.0%Added
Farmers & Merchants Investments Inc30$3.50K0.00%00.0%Unchanged
JFS Wealth Advisors, LLC30$3.50K0.00%+16+114.3%Added
Keating Financial Advisory Services, Inc.30$3.50K0.00%+29+2,900.0%Added
Bruce G. Allen Investments, LLC31$3.62K0.00%00.0%Unchanged
Harbour Investments, Inc.32$3.74K0.00%−5−13.5%Reduced
Transce3nd, LLC33$3.85K0.03%−38−53.5%Reduced
Purpose Unlimited Inc.34$3.97K0.00%+34New
Private Wealth Management Group, LLC36$4.21K0.00%00.0%Unchanged
Assetmark, Inc44$5.14K0.00%+5+12.8%Added
Basecamp Wealth Advisors LLC45$5.26K0.00%+5+12.5%Added
Rothschild Investment LLC47$5.49K0.00%+32+213.3%Added
Fortitude Family Office, LLC52$6.08K0.00%+42+420.0%Added
Sachetta, LLC54$6.31K0.00%00.0%Unchanged
Brown Brothers Harriman & Co55$6.42K0.00%+34+161.9%Added
Larson Financial Group LLC57$6.66K0.00%+34+147.8%Added
Pinnacle Wealth Planning Services, Inc.58$6.78K0.00%00.0%Unchanged
Bessemer Group Inc60$7.00K0.00%+60New
Rakuten Securities, Inc.64$7.48K0.00%+58+966.7%Added
Golden State Equity Partners66$7.71K0.00%+66New
Parkside Financial Bank & Trust68$7.94K0.00%−200−74.6%Reduced
CVA Family Office, LLC84$9.81K0.00%+84New
Private Trust Co NA90$10.5K0.00%00.0%Unchanged
Ancora Advisors, LLC97$11.3K0.00%00.0%Unchanged
Versant Capital Management, Inc101$11.8K0.00%+83+461.1%Added
Huntington National Bank119$13.9K0.00%00.0%Unchanged
Los Angeles Capital Management LLC157$18.3K0.00%00.0%Unchanged
Cullen/Frost Bankers, Inc.165$19.3K0.00%+1+0.6%Added
Spire Wealth Management172$20.1K0.00%−134−43.8%Reduced
Root Financial Partners, LLC172$20.1K0.00%+148+616.7%Added
National Bank of Canada182$21.3K0.00%−93−33.8%Reduced
Nisa Investment Advisors, LLC185$21.6K0.00%+135+270.0%Added
Advisory Services Network, LLC187$21.8K0.00%+187New
Advisor Group Holdings, Inc.190$22.2K0.00%−90−32.1%Reduced
NBC Securities, Inc.200$23.4K0.00%−4−2.0%Reduced
Smartleaf Asset Management LLC213$24.7K0.00%+112+110.9%Added
SRS Capital Advisors, Inc.232$27.1K0.00%+212+1,060.0%Added
EverSource Wealth Advisors, LLC234$27.3K0.00%+64+37.6%Added
Quent Capital, LLC238$27.8K0.00%+6+2.6%Added
Deseret Mutual Benefit Administrators248$29.0K0.01%+115+86.5%Added
Massmutual Trust Co FSB274$32.0K0.00%00.0%Unchanged
Farther Finance Advisors, LLC289$33.7K0.00%−11−3.7%Reduced
Umb Bank N A312$36.4K0.00%−81−20.6%Reduced
Jones Financial Companies LLLP361$40.8K0.00%+55+18.0%Added
Quadrant Capital Group LLC382$44.6K0.00%−65−14.5%Reduced
RWM Asset Management, LLC510$59.6K0.01%+510New
Walleye Trading LLC514$60.0K0.00%+514New
GAMMA Investing LLC531$62.0K0.00%+67+14.4%Added
BNP PARIBAS ASSET MANAGEMENT Holding S.A.535$62.5K0.00%+197+58.3%Added
Exchange Traded Concepts, LLC536$62.6K0.00%+536New
Covestor Ltd541$63.0K0.04%−1,121−67.4%Reduced
Nomura Asset Management Co Ltd670$78.3K0.00%−226−25.2%Reduced
GWM Advisors LLC689$80.5K0.00%−56−7.5%Reduced
STRS Ohio799$93.3K0.00%−1−0.1%Reduced
Parallel Advisors, LLC830$97.0K0.00%+475+133.8%Added
Rockefeller Capital Management L.P.857$100.1K0.00%−98−10.3%Reduced