W
WAVEMAN · COMPANY
WLK · Westlake Corp
> Ask across nine datasets ⌘K
LIVE
TEAM-2.62% 13F +440META+1.00% 13F +2,694RCG+0.35% CLUSTERUTHR-0.54% 13F +425CRWV+5.68% 13F +694CRM-1.97% 13F +1,019CVNA+1.58% 13F +795TPL-1.11% 13F +444NET-1.96% 13F +711MSTR-1.39% 13F +527DELL+1.50% 13F +1,204CRWD-0.87% 13F +1,383ANET+1.22% 13F +1,324COIN-4.18% 13F +475TEAM-2.62% 13F +440META+1.00% 13F +2,694RCG+0.35% CLUSTERUTHR-0.54% 13F +425CRWV+5.68% 13F +694CRM-1.97% 13F +1,019CVNA+1.58% 13F +795TPL-1.11% 13F +444NET-1.96% 13F +711MSTR-1.39% 13F +527DELL+1.50% 13F +1,204CRWD-0.87% 13F +1,383ANET+1.22% 13F +1,324COIN-4.18% 13F +475
← ALL COMPANIES

WLK

WESTLAKE CORP
PHARMA & BIOTECH · INDUSTRIAL ORGANIC CHEMICALS · CIK 0001262823
FORM 144 · 1☆ WATCH
INSIDER NET · 180D
-$5.4M
open-market buys minus sells, Form 4 codes P and S
INSIDER BUYERS · 180D
0
CONGRESS BUYERS · 1Y
0
FUNDS ADDED · QTR
198
13F, latest reported quarter
REVENUE GROWTH
-8.0%
XBRL, annual
NET MARGIN
-13.5%
CONVERSIONS · 180D
11
codes C/M, not in net · $2.4M priced
COMPLAINTS · 90D
1,008
+24.1% YoY · CFPB
SEVEN FACTS, RANKED AGAINST THE SECTOR · RANK IS NOT A FORECAST
INSIDERS
net -$5.4M over 180 days
-$3.1M over 90 days
below 79% of Pharma & Biotech
CONGRESS
no member of Congress has reported trading it
FUNDS
198 funds added or opened last quarter
more than 87% of Pharma & Biotech
REVENUE
-8.0% year over year
below 69% of Pharma & Biotech
MARGIN
-13.5% net margin
more than 53% of Pharma & Biotech
BUYBACKS
$30.0M repurchased, FY to 2026-06-30
below 53% of Pharma & Biotech
SHORT
no short interest reported
THE SITUATION · EVERY LINE IS ONE RULE OVER ONE DATASET
Insiders are net sellers: -$5.4M across 3 people in 180 days.
198 funds added or opened positions in the latest 13F quarter, of 362 holders.
The year, with the filings on it
Total return indexed to 100 over the last 12 months · every marker is a federal filing, placed at its date — hover any marker for the detail
TOTAL 12M RETURN -11.8%
-11.8%12M
-35%-8%+18%+45%2025-092025-102025-122026-032026-052026-072026-09 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
INDEXED RETURN, DIVIDEND-ADJUSTED — NOT A PRICE CHART · LARGE TRADES DRAWN FIRST WHEN A NAME FILES HEAVILY
Live price
Daily candles from TradingView, on their licence — no filings are marked on this one
WHY THIS NAME IS ON THE DESK
Insiders have filed to sell — before selling.
The record shows a net $5.4M sold by insiders over 180 days, 198 funds added last quarter, $3.1M in planned Form 144 sales. Every figure is a federal filing, dated the day it became public.
Same sector, ranked by filing activity
Sector from the SEC's own SIC classification
Insider transactions
Form 4 purchases and sales (codes P and S) — grants, option exercises and preferred conversions excluded

Over the last 180 days, WESTLAKE CORP insiders sold a net $5.4M of stock across 59 Form 4 purchases and sales, with 0 insider(s) buying. Source: SEC Form 4 filings, as of 2026-09-06.

INSIDER
FILED
SHARES
VALUE
Chao Albert
Executive Chairman
SELL
2026-08-11
7,489.0
$596.9K
Chao Albert
Executive Chairman
SELL
2026-08-11
31,384.0
$2.5M
Buesinger Robert F.
EVP, PEM Segment Head
SELL
2026-03-27
4,000.0
$461.0K
Bender Mark Steven
EVP & CFO
SELL
2026-03-27
16,413.0
$1.8M
Bender Mark Steven
EVP & CFO
SELL
2026-02-27
421.0
$42.7K
59 TRANSACTIONS ON RECORD

Showing the most recent few. Create a free account to see 54 more transactions on record, the cross-source screener and CSV export. We store only your email address, and there is no password to create.

Institutional holders
13F · holdings as of the latest quarter funds have reported
BlackRock, Inc.
3,294,162.0 sh
$240.5M
Capital World Investors
2,842,348.0 sh
$207.5M
Orbis Allan Gray Ltd
2,084,364.0 sh
$152.2M
DIMENSIONAL FUND ADVISORS LP
2,051,554.0 sh
$149.8M
VANGUARD PORTFOLIO MANAGEMENT LLC
1,752,627.0 sh
$127.9M
SCHEDULE 13D/G
No 5%+ ownership filings
Nobody has crossed 5% with a filing obligation. Absence is a fact here, not missing data.
Planned sales · Form 144
Filed before the sale — intent, not a trade
ALBERT Y CHAO
FILED 2026-08-11
$3.1M
Fund concentration
N-PORT · funds ranked by how much of THEMSELVES they put in this stock — the conviction number 13F cannot show
Nuveen Small/Mid Cap Value Fund
$2.4M POSITION · AS OF 2026-03-31
2.1%
Brandes U.S. Value ETF
$5.2M POSITION · AS OF 2026-03-31
1.9%
American Beacon GLG Natural Resources ETF
$15.1M POSITION · AS OF 2026-04-30
1.9%
Invesco Dorsey Wright Basic Materials Momentum ETF
$1.9M POSITION · AS OF 2026-04-30
1.8%
Brandes Global Equity Fund
$1.5M POSITION · AS OF 2026-03-31
1.8%
ProShares S&P MidCap 400 Dividend Aristocrats ETF
$31.2M POSITION · AS OF 2026-02-28
1.8%
SEC N-PORT, MONTHLY WITH A ~60-DAY PUBLIC LAG · FUNDS ≥ $10M · % = SHARE OF THE FUND'S OWN BOOK
Fundamentals
Annual figures from XBRL filings · pick a past date to see them exactly as the market knew them then — restatements and all
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-YEAR PERIODS · AS KNOWN ON 2026-09-06 · NOBODY ELSE SHOWS FUNDAMENTALS AS OF A PAST DATE
W WAVEMAN

Public filings, honestly analyzed. Official US government sources in one desk — every figure carries the date it was filed, and the methodology is published, backtest included.

SEC FORM 4FORM 13F 13D/GFORM 144XBRL STOCK ACTCONTRACTSFEC CFPBNRC
© 2026 WAVEMAN · SOURCE: SEC EDGAR & OFFICIAL GOVERNMENT DATA · NOT INVESTMENT ADVICE · CHART BY TRADINGVIEW · UPDATED 2026-09-06 ALL SYSTEMS LIVE FOR MACHINES →