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WLK · Westlake Corp
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WLK Westlake (WLK) Insider Trading, Ownership & Congress Trades

Materials · Industrial organic chemicals · CIK 0001262823
Quote by TradingView
Form 144 · 1
Insider buyers, 180 days
0
House members buying, 1 year
0
STOCK Act, US House only, disclosed up to 45 days after the trade
Funds added, last quarter
199
13F, latest reported quarter
Conversions, 180 days
11
Codes C/M, not in net · $2.4M priced

What the filings say about WLK

Insiders, 180 days
-$3.1M net sold
1 seller · 0% of sales under a 10b5-1 plan
Planned sales (Form 144), 90 days
$3.1M
1 notice

Westlake insider trades (Form 4)

Form 4 buys and sells (codes P and S). Grants, option exercises and conversions excluded.

Over the last 180 days, WESTLAKE CORP insiders sold a net $3.1M of stock across 59 Form 4 purchases and sales, with no insider buying. Source: SEC Form 4 filings, as of 2026-10-27.

Insider
Filed
Shares
Value
Since filing
Chao Albert
Executive Chairman
SELL
2026-08-11 SEC
7,489
$596.9K
-16.9%
Context
  • 17 earlier Form 4 trades (code P or S) here by this insider (1 buy, 16 sales), the last on Dec 22, 2025.
  • The trade is 1.1% of the 674,264 shares held after it.
  • No other insider sold within 30 days.
  • 199 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Executive Chairman Chao Albert sold about $596.9K of WLK on Aug 11, 2026; 199 funds added in the latest 13F quarter.
Chao Albert
Executive Chairman
SELL
2026-08-11 SEC
31,384
$2.5M
-16.9%
Context
  • 17 earlier Form 4 trades (code P or S) here by this insider (1 buy, 16 sales), the last on Dec 22, 2025.
  • The trade is 4.9% of the 642,880 shares held after it.
  • No other insider sold within 30 days.
  • 199 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: Executive Chairman Chao Albert sold about $2.5M of WLK on Aug 11, 2026, the largest insider sale at the company since 2022; 199 funds added in the latest 13F quarter.
Buesinger Robert F.
EVP, PEM Segment Head
SELL
2026-03-31 SECtraded 2026-03-27
4,000
$461.0K
-43.6%
Context
  • 10 earlier Form 4 trades (code P or S) here by this insider (1 buy, 9 sales), the last on May 27, 2025.
  • The trade is 11.6% of the 34,482 shares held after it.
  • 1 other insider sold within 30 days.
  • 199 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: EVP, PEM Segment Head Buesinger Robert F. sold about $461.0K of WLK on Mar 27, 2026; 1 other insider sold within 30 days and 199 funds added in the latest 13F quarter.
Bender Mark Steven
EVP & CFO
SELL
2026-03-30 SECtraded 2026-03-27
16,413
$1.8M
-43.8%
Context
  • 18 earlier Form 4 trades (code P or S) here by this insider (18 sales), the last on Feb 27, 2026.
  • The trade is 58.6% of the 28,015 shares held after it.
  • 1 other insider sold within 30 days.
  • 199 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: EVP & CFO Bender Mark Steven sold about $1.8M of WLK on Mar 27, 2026; 1 other insider sold within 30 days and 199 funds added in the latest 13F quarter.
Bender Mark Steven
EVP & CFO
SELL
2026-03-02 SECtraded 2026-02-27
421
$42.7K
-36.2%
Context
  • 16 earlier Form 4 trades (code P or S) here by this insider (16 sales), the last on May 3, 2024.
  • The trade is 0.9% of the 44,433 shares held after it.
  • 1 other insider sold within 30 days.
  • 199 funds added in the 13F quarter to Jun 30, 2026.
Insider activity: EVP & CFO Bender Mark Steven sold about $42.7K of WLK on Feb 27, 2026; 1 other insider sold within 30 days and 199 funds added in the latest 13F quarter.
59 transactions on record
Since filing: total return from the first close after the filing to the latest close, dividend-adjusted. Not a forecast.
Context lines are counts over the filings above and returns from our own price history, never a price level. Not investment advice.
See all insider buying · insider selling
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Seven facts, ranked against the sector · Rank is not a forecast
Insiders
net -$3.1M over 180 days
-$3.1M over 90 days
below 84% of Materials
Congress
no House purchase disclosed in the last 12 months
Funds
199 funds bought in last quarter
more than 68% of Materials
Revenue
-8.0% year over year
below 80% of Materials
Margin
-13.5% net margin
below 74% of Materials
Buybacks
$30.0M repurchased, FY to 2026-06-30
below 67% of Materials
Short interest
14.7% of the float short (float per yahoo 2026-10-26) · 6.7 days to cover · settled 2026-09-30
more than 51% of Materials
What changed in the last 30 days
Nothing new filed in the last 30 days

Watch WLK

A free account keeps a watchlist and can send one email a day when insiders, funds or Congress file on the names in it. No password and no card.

The year, with the filings on it
Total return over 12 months. Each marker is a filing; hover or tap one for the detail.
-11.6%12M
-25%+5%+36%+66%2025-102025-122026-022026-042026-062026-082026-10 2026-08-11 · Chao Albert sold $2.5M2025-12-22 · Chao Albert sold $2.3M2026-03-27 · Bender Mark Steven sold $1.8M2026-02-27 · Bender Mark Steven sold $1.7M2025-12-22 · Chao Albert sold $707.2K2026-08-11 · Chao Albert sold $596.9K2026-03-27 · Buesinger Robert F. sold $461.0K2026-02-27 · Bender Mark Steven sold $42.7K2025-12-22 · Chao Albert sold $38.8K2026-08-11 · ALBERT Y CHAO filed to sell $3.1M
Insider sellForm 144 (planned sale)
Indexed to 100, dividend-adjusted, not a price chart. When a name files heavily, the largest trades are drawn first.

Who owns WLK: institutional holders (13F)

13F holdings, latest reported quarter
BlackRock, Inc.
3,294,162 sh
$240.5M
Capital World Investors
2,842,348 sh
$207.5M
Orbis Allan Gray Ltd
2,084,364 sh
$152.2M
DIMENSIONAL FUND ADVISORS LP
2,051,554 sh
$149.8M
VANGUARD PORTFOLIO MANAGEMENT LLC
1,752,627 sh
$127.9M

Congress trades in WLK

No Congress trades reported
No House member has disclosed a trade in this stock. See what Congress is buying.

Activist and 5% holders (13D/13G)

No 5%+ ownership filings
Nobody has filed for crossing 5%. That is a fact, not missing data.

WLK planned insider sales (Form 144)

Notice of intent to sell, filed before any sale
ALBERT Y CHAO
Filed 2026-08-11
$3.1M

WLK mutual fund holders (N-PORT)

Funds ranked by the share of their own portfolio in this stock (N-PORT).
Pinnacle Focused Opportunities ETF
$1.7M position · as of 2026-05-31
1.8%
CresAlta Small and Mid-Cap ETF
$1.6M position · as of 2026-07-31
1.7%
ProShares S&P MidCap 400 Dividend Aristocrats ETF
$19.8M position · as of 2026-05-31
1.2%
Nuveen Small/Mid Cap Value Fund
$1.6M position · as of 2026-06-30
1.2%
Brandes Global Equity Fund
$931.2K position · as of 2026-06-30
1.1%
First Eagle US Smid Cap Opportunity Fund
$1.2M position · as of 2026-07-31
1.1%
SEC N-PORT, monthly, about 60 days late · funds ≥ $10M · % is the share of the fund's own portfolio
Executive pay vs shareholder return · Jean Marc Gilson
CEO pay, headline and as actually paid, against the company's return and its chosen peers' (DEF 14A).
FY
CEO total
Actually paid
Other execs, avg
TSR
Peer TSR
2025
$6.4M
$3.7M
$5.2M
-2%
+22%
2023
$12.0M
$22.8M
$6.0M
+78%
+24%
2022
$12.2M
$17.7M
$5.4M
+29%
+12%
2021
$10.4M
$14.0M
$4.0M
+21%
+26%
2020
$10.9M
$14.0M
$4.4M
+18%
+18%
Tagged by the company under SEC Item 402(v). Returns are cumulative from the start of the disclosure period. Green where the company beat its own peer group.
Live price
Daily candles from TradingView, under their licence. No filings marked.
Why this name is on the desk
Insiders have filed to sell, before selling.
The record shows a net $3.1M sold by insiders over 180 days, 199 funds added last quarter, $3.1M in planned Form 144 sales. Each figure is a federal filing, dated the day it went public.
Backtest this pattern Open the screener
Same sector, ranked by filing activity
Sector by SEC SIC code
JELDLEGHWMSAVYSXTENTGREXGEVOCMTKOPNKEBNET

WLK financials

Revenue growth
-8.0%
XBRL, annual
Net margin
-13.5%
Complaints, 90 days
978
+19.3% YoY · CFPB
Ratios from the company's XBRL filings, latest filings
Revenue, TTM
$11.3B
four quarters, 2025-07-01 to 2026-06-30
Net margin, TTM
-10.9%
net income over revenue, 2025-07-01 to 2026-06-30
Free cash flow, TTM
-$265.0M
operating cash flow minus capex, 2025-07-01 to 2026-06-30
Debt to equity
0.58x
long-term 2026-06-30 plus current 2026-06-30; equity 2026-06-30
Cash flow to debt
0.12x
TTM operating cash flow over long-term 2026-06-30 plus current 2026-06-30
Return on equity
-13.0%
TTM net income over average of 2025-06-30 and 2026-06-30
Return on assets
-6.1%
TTM net income over average of 2025-06-30 and 2026-06-30
Return on invested capital
n/a
pre-tax loss, no effective tax rate to apply
Return on capital employed
-7.0%
operating income (EBIT proxy) over average of 2025-06-30 and 2026-06-30 minus current liabilities
P/E, trailing
n/a
trailing loss, a multiple of a loss is not meaningful
Enterprise value
$11.8B
market value at close 2026-10-26 on 2026-07-29 shares, plus long-term 2026-06-30 plus current 2026-06-30, minus cash 2026-06-30
FCF yield
-3.2%
TTM free cash flow over market value at close 2026-10-26
PEG, trailing
n/a
trailing loss, a multiple of a loss is not meaningful
Price as of 2026-10-26. Hover or tap a tile for its yearly and quarterly history.
Method
TTM is four consecutive fiscal quarters; Q4 is the year minus nine months when not filed. Returns use the average of opening and closing balances. EBIT is approximated by operating income. PEG uses trailing EPS growth.
Fundamentals
Annual figures from XBRL filings. Pick a past date to see them as known then.
2025-122024-122023-122022-12
Revenue$11.2B$12.1B$12.5B$15.8B
Gross profit$813.0M$2.0B$2.2B$4.1B
Operating income-$1.6B$875.0M$729.0M$3.0B
Net income-$1.5B$602.0M$479.0M$2.2B
EPS (diluted)-11.704.643.7017.34
Operating cash flow$465.0M$1.3B$2.3B$3.4B
Cash$2.7B$2.9B$3.3B$2.2B
Long-term debt$5.1B$4.6B$4.6B$4.9B
Buybacks$63.0M$60.0M$23.0M$101.0M
Dividends paid$272.0M$264.0M$221.0M$169.0M
SEC XBRL, fiscal years, as known on 2026-10-27

WLK Stock Sonar score 6/7 axes

Find similar shapesCompare

WLK ranks highest on institutional and government (68th percentile) and financial health (50th), and lowest on insider conviction (8th), among Materials peers.

ProfitHealthGrowthInsidersInstitutionsRisk
Profitability
25
Inputs
  • Return on equity-13.0% · 24 pct, sector of 100
  • Return on assets-6.1% · 30 pct, sector of 120
  • Return on invested capitalpre-tax loss, no effective tax rate to apply
  • Return on capital employed-7.0% · 21 pct, sector of 96
Financial health
50
Inputs
  • Debt to equity0.58x · 60 pct, sector of 104
  • Cash flow to debt0.12x · 40 pct, sector of 103
Growth
20
Inputs
  • Revenue growth, YoY-8.0% · 20 pct, sector of 128
  • Backlog growth, YoYno backlog line filed, or no year-earlier backlog
Insider conviction
8
Inputs
  • Net Form 4 buying (codes P and S), 180d-$3.1M · 16 pct, sector of 80
  • Insider buyers, 180d0 · 0 pct, sector of 80
Institutional and government
68
Inputs
  • Funds adding, latest quarter199 · 68 pct, sector of 118
  • Congress net buyers, 365dno Congress trades in 365 days
  • Federal contracts, 180dno federal contracts in 180 days
  • Lobbying spend, 4 quartersno lobbying filings in the last four quarters
Risk and compliance
14
Inputs
  • Short interest, % of float+14.7% · 8 pct, sector of 143
  • Recalls per $1B revenue, 3ynot measured for this sector, almost no peer has an event
  • EPA cases per $1B revenue, 5y0.09 per $1B · 20 pct, sector of 103
  • New text in Risk Factors, latest 10-Kneeds two 10-Ks with a Risk Factors section (not 20-F filers or stubs)
1 not measured: US patents
  • US patents needs 1 of 2 inputs, 0 present: patent data not loaded yet

6 of 7 axes scored. Each is a percentile against sector peers (all companies when the sector is thin); higher is better. An unscored axis is unmeasured, not low. How it is scored

WLK filings, in plain words

Are Westlake insiders buying or selling WLK?

In the 180 days to 2026-10-27, Westlake insiders were net sellers, a net $3.1M across purchases and sales reported on Form 4, by 1 seller.

Are there planned insider sales of WLK?

Yes. 1 Form 144 notice of planned insider sales was filed in the 90 days to 2026-10-27, covering $3.1M of stock; the latest, by ALBERT Y CHAO, was filed 2026-08-11.

Read the full summary

In the 180 days to 2026-10-27, Westlake insiders were net sellers of WLK, a net $3.1M across purchases and sales reported on Form 4 by 1 seller. Insiders filed 1 Form 144 notice of intent to sell in the 90 days to 2026-10-27, covering $3.1M of stock. Each figure is counted from SEC and House filings as of 2026-10-27, dated the day the filing was made public.

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