Westlake Corp
WLK- Exchange
- NYSE
- Industry
- Industrial Organic Chemicals
- SEC CIK
- 0001262823
No open-market purchases or sales by Westlake Corp insiders were filed in the last 90 days; 363 institutions reported holding it in 13F filings for Q2 2026, worth $2.90B in total; no superinvestor holds it.
Key figures
- Market capClose on Nov 13, 2026
- $8.13B
- Insider buysOpen market, last 90 days
- 0
- Insider sellsOpen market, last 90 days
- 0
- 13F holdersQ2 2026, +23 vs. previous quarter
- 363
- 13F valueReported value at the end of Q2 2026
- $2.90B
- Superinvestors holdingAt the end of Q2 2026
- 0
Price chart
Financials
See financial statementsFrom SEC filings, in USD.
- Revenue, FY2025
- $11.2B
- −8.0% year over year
- Net income, FY2025
- -$1.51B
- −350.5% year over year
- Free cash flow, FY2025
- -$530.0M
- −273.2% year over year
- Revenue, Q3 FY2026
- $2.98B
- +5.0% year over year
Revenue flow, FY2025
Green is profit; orange is costs, expenses and taxes. Percentages are shares of revenue.
Net loss for FY2025: $1.51B (13.5% of revenue).
Short interest
See short dataFrom FINRA, settlement date Oct 30, 2026.
- Short interest
- 3.99M
- Shares sold short
- Change
- −265.3K
- −6.2% vs. previous
- Days to cover
- 4.38
- At average daily volume
Superinvestors holding WLK, Q2 2026
Go to the superinvestors tabNo superinvestor reported holding WLK at the end of Q2 2026.
Latest insider trades
See all insider tradesOpen-market purchases and sales by Westlake Corp insiders from Form 4, newest first.
| Filed (ET) | Trade date | Filing delay | Insider | Transaction | Shares | Avg price | Value | Holding change | Flags |
|---|---|---|---|---|---|---|---|---|---|
| Aug 11, 2026 (view filing)5:45 PM ET | Aug 11 | Same day | Chao AlbertExecutive Chairman | SSale | −38.9K | $80.28 | −$3.12M | −5.7%642.9K after | 2 lots |
| Mar 31, 2026 (view filing) | Mar 27 | 4 days | Buesinger Robert F.EVP, PEM Segment Head | SSale | −4.00K | $115.25 | −$461.0K | −10.4%34.5K after | |
| Mar 30, 2026 (view filing) | Mar 27 | 3 days | Bender Mark StevenEVP & CFO | SSale | −16.4K | $112.54 | −$1.85M | −36.9%28.0K after | |
| Mar 2, 2026 (view filing) | Feb 27 | 3 days | Bender Mark StevenEVP & CFO | SSale | −17.4K | $100.92 | −$1.76M | −28.2%44.4K after | 2 lots |
| Dec 23, 2025 (view filing) | Dec 22 | 1 day | Chao AlbertExecutive Chairman | SSale | −40.8K | $73.58 | −$3.00M | −6.1%627.7K after | 3 lots |
| Jun 9, 2025 (view filing) | Apr 22 | 48 daysLate | Buesinger Robert F.EVP, PEM Segment Head | PPurchase | +83 | $93.39 | +$7.75K | New position83 after | |
| Jun 9, 2025 (view filing) | May 27 | 13 daysLate | Buesinger Robert F.EVP, PEM Segment Head | SSale | −83 | $72.70 | −$6.03K | −100.0%0 after | |
| Dec 2, 2024 (view filing) | Nov 29 | 3 days | Chao David Tsung-HungDirector | SSale | −1.75K | $129.08 | −$225.9K | −18.4%7.78K after | |
| Nov 25, 2024 (view filing) | Nov 22 | 3 days | Chao David Tsung-HungDirector | SSale | −1.75K | $130.00 | −$227.5K | −15.5%9.53K after | |
| May 13, 2024 (view filing) | May 9 | 4 days | Buesinger Robert F.EVP, HIP, IT & Digital | SSale | −3.50K | $158.50 | −$554.8K | −16.6%17.6K after |
Top 10 13F holders, Q2 2026
See all 363 holdersThe largest institutional positions in Westlake Corp at the end of Q2 2026; share changes are against Q1 2026.
| Institution | Shares | Value | % of portfolio | Change in shares | Action |
|---|---|---|---|---|---|
| BlackRock, Inc. | 3,294,162 | $240.5M | 0.00% | +215,075+7.0% | Added |
| Capital World Investors | 2,842,348 | $207.5M | 0.02% | −1,368,658−32.5% | Reduced |
| Price T Rowe Associates Inc | 2,206,676 | $161.1M | 0.02% | −200,781−8.3% | Reduced |
| Orbis Allan Gray Ltd | 2,084,364 | $152.2M | 0.52% | −3,209,155−60.6% | Reduced |
| Dimensional Fund Advisors LP | 2,051,554 | $149.8M | 0.03% | +585,534+39.9% | Added |
| Vanguard Portfolio Management LLC | 1,752,627 | $127.9M | 0.01% | −17,181−1.0% | Reduced |
| Brandes Investment Partners, LP | 1,572,939 | $114.8M | 0.80% | −269,711−14.6% | Reduced |
| AQR Capital Management LLC | 1,570,453 | $114.6M | 0.04% | +1,310,383+503.9% | Added |
| Vanguard Capital Management LLC | 1,464,223 | $106.9M | 0.00% | +8,629+0.6% | Added |
| State Street Corp | 1,453,407 | $106.1M | 0.00% | +72,914+5.3% | Added |
Politician trades
All politician trades in WLK3 members of Congress reported 5 trades in Westlake Corp since 2020. Newest filings:
| Filed | Politician | Type | Amount |
|---|---|---|---|
| Jul 13, 2021 |  Susie Lee House · NV | Sell | $1K-$15K |
| Mar 16, 2021 |  Peter Meijer House · MI | Sell | $1K-$15K |
| Jan 11, 2021 | Susie Lee House · NV | Buy | $1K-$15K |
| Jan 11, 2021 | Susie Lee House · NV | Buy | $1K-$15K |
| Aug 24, 2020 |  James Comer House · KY | Sell | $1K-$15K |
House · NV · Jul 13, 2021
Sell$1K-$15K
House · MI · Mar 16, 2021
Sell$1K-$15K
House · NV · Jan 11, 2021
Buy$1K-$15K
House · NV · Jan 11, 2021
Buy$1K-$15K
House · KY · Aug 24, 2020
Sell$1K-$15K