Stock Trading Canary

United States · SEC Form 4 · Snapshot date: 2026-10-18 · Built: 2026-10-18 · 中文

← United States · Coverage record

US · SEC FORM 4

WESTLAKE CORP

WLK · NYSE · CIK 0001262823 · Basic Materials · Specialty Chemicals

INSIDER SIGNAL

No active buy signal

0 qualifying P purchase groups
in the current 180-day scoring window

14 Form 4 transaction lines observed in the same window
2 sales · 12 option, withholding, award, gift or other lines

Last qualifying purchase2025-04-22 · Buesinger Robert F. · $7.8K

WHY NO ACTIVE SIGNAL?

Purchase activityNone
Recent buyingNone
Recent salesLow
Buy signal statusInactive
Score anatomy

No score is calculated because there is no qualifying purchase in the active window. Unavailable inputs are not treated as zero or as a bearish signal.

ClusterNot calculated
Purchase sizeNot calculated
RoleNot calculated
RecencyNot calculated
ConvictionNot calculated

Why is there no score?

  • No qualifying open-market purchase supplies cluster, size, role, recency or conviction inputs.
  • Sales and other Form 4 activity remain visible as context and do not create a negative score.

Sales and other Form 4 activity are shown separately and do not create a negative buy signal. Absence of buying is not scored as bearish.

Insider activity timeline

Owner lanes show the latest 180 days. Symbol shape identifies the transaction type; sales remain context only.

AprMayJunJulAugSepOct
Bender Mark StevenEVP & CFO
○○
Chao AlbertExecutive Chairman
○▼
Sheets Jeffrey WayneDirector
○
Sabat Carolyn ChaoDirector
○
NORTHCUTT R BRUCEDirector
○
MCCOLLUM MARK ADirector
○
● Purchase▼ Sale○ Other

Showing the six most active owners; 5 additional owner(s) remain in Form 4 evidence.

Purchase breadth, concentration & cluster buying

These modules activate when qualifying purchases enter the 180-day research window.

SIGNAL HISTORY

No recorded active-signal snapshot

Scores are archived only when the company qualifies for a published US buy-signal snapshot. Last qualifying purchase: 2025-04-22 · Buesinger Robert F..

Recent Form 4 activity

0Purchases
9Sales
49Other Form 4 lines
32SEC filings · 365 days
BUYING0 qualifying P line(s) · 180 days
SELLING2 sale line(s) · context only
OTHER12 exercise / withholding / award / gift / other lines
10b5-1 / PLANNEDNot assessed

P is an open-market or private purchase. S is a sale. M, F, A and G usually describe exercises, tax withholding, awards and gifts. These categories remain visually separate.

Market context

Market context has not been captured for this ticker yet. The daily market-context job processes the US universe in rotating batches.

Short interest

Short interest is external context reported to FINRA by broker-dealers. It does not affect the Insider Signal.

Shares short
4,867,702
Previous report
5,309,547
Avg daily volume
725,202
Days to cover
6.7

FINRA settlement date: 2026-09-30 · Captured 2026-10-12 · FINRA equity short interest ↗. A share count, published about a week after each of two settlement dates a month; not a percentage of shares outstanding.

Historical equity purchases

Qualifying code P transactions in the local Form 4 history, including purchases outside the current signal window.

Transaction dateReporting ownerTypeSecuritySharesAvg. priceApprox. valueSource
2025-04-22Buesinger Robert F.Purchase (P)Common Stock83USD 93.39USD 7,751SEC filing ↗
2021-08-11Chao AlbertPurchase (P)Common Stock3,000USD 86.21USD 258,630SEC filing ↗
2020-03-27TTWFGP LLCPurchase (P)Common Stock160,000USD 39.08USD 6,252,800SEC filing ↗
2020-03-27TTWFGP LLCPurchase (P)Common Stock160,000USD 39.08USD 6,252,938SEC filing ↗
2020-03-26TTWFGP LLCPurchase (P)Common Stock145,000USD 41.00USD 5,945,000SEC filing ↗
2020-03-26TTWFGP LLCPurchase (P)Common Stock145,000USD 41.00USD 5,945,447SEC filing ↗
2020-03-25TTWFGP LLCPurchase (P)Common Stock130,000USD 40.77USD 5,300,100SEC filing ↗
2020-03-25TTWFGP LLCPurchase (P)Common Stock130,000USD 40.77USD 5,300,059SEC filing ↗
2020-03-24TTWFGP LLCPurchase (P)Common Stock145,000USD 36.53USD 5,296,850SEC filing ↗
2020-03-24TTWFGP LLCPurchase (P)Common Stock145,000USD 36.53USD 5,297,346SEC filing ↗
2020-03-19TTWFGP LLCPurchase (P)Common Stock165,000USD 37.66USD 6,213,900SEC filing ↗
2020-03-19TTWFGP LLCPurchase (P)Common Stock101,664USD 37.87USD 3,850,124SEC filing ↗
2020-03-18TTWFGP LLCPurchase (P)Common Stock165,000USD 31.41USD 5,182,650SEC filing ↗
2020-03-18TTWFGP LLCPurchase (P)Common Stock63,336USD 37.32USD 2,363,700SEC filing ↗
2020-03-18TTWFGP LLCPurchase (P)Common Stock165,000USD 31.40USD 5,181,316SEC filing ↗

Form 4 evidence

58 transaction lines in the latest 365-day window; 607 in local history.

DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-08-11Chao AlbertSale (S)Common Stock38,873USD 80.28USD 3,120,775SEC filing ↗
2026-08-11Chao AlbertOption exercise / conversion (M)Common Stock38,873USD 61.87USD 2,405,073SEC filing ↗
2026-08-08Sheets Jeffrey WayneOption exercise / conversion (M)Common Stock2,168USD —USD —SEC filing ↗
Show recent Form 4 evidence (30 grouped rows)
DateOwnerTypeSecuritySharesAvg. priceApprox. valueSource
2026-08-11Chao AlbertSale (S)Common Stock38,873USD 80.28USD 3,120,775SEC filing ↗
2026-08-11Chao AlbertOption exercise / conversion (M)Common Stock38,873USD 61.87USD 2,405,073SEC filing ↗
2026-08-08Sheets Jeffrey WayneOption exercise / conversion (M)Common Stock2,168USD —USD —SEC filing ↗
2026-08-08Sabat Carolyn ChaoOption exercise / conversion (M)Common Stock2,168USD —USD —SEC filing ↗
2026-08-08NORTHCUTT R BRUCEOption exercise / conversion (M)Common Stock2,168USD —USD —SEC filing ↗
2026-08-08MCCOLLUM MARK AOption exercise / conversion (M)Common Stock2,168USD —USD —SEC filing ↗
2026-08-08Lubel Kimberly SOption exercise / conversion (M)Common Stock2,168USD —USD —SEC filing ↗
2026-08-08Graff Michael JOption exercise / conversion (M)Common Stock2,168USD —USD —SEC filing ↗
2026-08-08Chao David Tsung-HungOption exercise / conversion (M)Common Stock2,168USD —USD —SEC filing ↗
2026-08-08Chao Catherine T.Option exercise / conversion (M)Common Stock2,168USD —USD —SEC filing ↗
2026-08-08CREGG ROGER AOption exercise / conversion (M)Common Stock2,168USD —USD —SEC filing ↗
2026-05-13Bender Mark StevenTax withholding (F)Common Stock5,284USD 97.34USD 514,345SEC filing ↗
2026-05-12Bender Mark StevenOption exercise / conversion (M)Common Stock13,164USD 0.00USD 0SEC filing ↗
2026-03-27Buesinger Robert F.Sale (S)Common Stock4,000USD 115.25USD 461,000SEC filing ↗
2026-03-27Bender Mark StevenSale (S)Common Stock16,413USD 112.54USD 1,847,119SEC filing ↗
2026-02-27Bender Mark StevenSale (S)Common Stock17,409USD 100.92USD 1,756,999SEC filing ↗
2026-02-27Bender Mark StevenOption exercise / conversion (M)Common Stock12,693USD 76.42USD 969,947SEC filing ↗
2026-02-27Bender Mark StevenD (D)Common Stock12,693USD 98.20USD 1,246,453SEC filing ↗
2026-02-20Szwejbka Scott ThomasTax withholding (F)Common Stock91USD 94.10USD 8,563SEC filing ↗
2026-02-20Holy Jeffrey AdamTax withholding (F)Common Stock81USD 94.10USD 7,622SEC filing ↗
2026-02-20Ederington L. BenjaminTax withholding (F)Common Stock357USD 94.10USD 33,594SEC filing ↗
2026-02-20Chao John Tsung-chenTax withholding (F)Common Stock91USD 94.10USD 8,563SEC filing ↗
2026-02-20Chao JamesTax withholding (F)Common Stock1,569USD 94.10USD 147,643SEC filing ↗
2026-02-20Chao AlbertTax withholding (F)Common Stock2,501USD 94.10USD 235,344SEC filing ↗
2026-02-20Buesinger Robert F.Tax withholding (F)Common Stock326USD 94.10USD 30,677SEC filing ↗
2026-02-20Bender Mark StevenTax withholding (F)Common Stock445USD 94.10USD 41,874SEC filing ↗
2026-02-19Szwejbka Scott ThomasAward / grant (A)Common Stock365USD 0.00USD 0SEC filing ↗
2026-02-19Holy Jeffrey AdamAward / grant (A)Common Stock264USD 0.00USD 0SEC filing ↗
2026-02-19Ederington L. BenjaminAward / grant (A)Common Stock1,425USD 0.00USD 0SEC filing ↗
2026-02-19Chao John Tsung-chenAward / grant (A)Common Stock213USD 0.00USD 0SEC filing ↗

Multiple price lines in one filing are grouped and share-weighted. Price and value are blank when a grouped filing line lacks price evidence.

Snapshot & identity

Snapshot date2026-10-18
Ranking versionUS-v1.2
Data qualityPASS ELIGIBLE · —
TickerWLK
CIK0001262823
SectorBasic Materials
IndustrySpecialty Chemicals Yahoo Finance
SEC SIC2860 Industrial Organic Chemicals
ExchangeNYSE

Data coverage

Local Form 4 history607 transaction lines from 2020-02-17 to 2026-08-11
49 P purchase lines · 76 S sale lines · 482 other lines
SEC company submissionsOpen SEC filings ↗

Local ledger as of 2026-10-18. Mapping status is an audit field and does not erase SEC filing evidence.