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Latest on record
The most recent facts, as filed.
Up to three of the most recent, checkable facts already loaded on this page, each linked to its source.
- Sep 29, 2026Material event · 8-KFiled by the company itself.Open the filing ↗
- Aug 31, 2026Material event · 8-KFiled by the company itself.Open the filing ↗
- Aug 11, 2026Reported sale · Form 4Albert Chao, Executive Chairman · $596.9KOpen the filing ↗
In numbers
What this profile holds, counted.
Closes · 1 year250
SEC filings on record1,6080 flagged findings
Reported transactions (Form 4)80since Feb 18, 2026 · and 23 other holdings
Corporate events (8-K)30since Aug 19, 2021
What the record says
Description, identity and filings, each with its source.
Every block cites its source. The colour of a finding marks its category — which document, who filed it — not how much it matters.
What the company does
Westlake Corporation is an international manufacturer and supplier of petrochemicals, polymers and fabricated building products, which are fundamental to various consumer and industrial markets. The company was founded by Ting Tsung Chao in 1986. it is the largest producer of low-density polyethylene (LDPE) in the US and ranks among the Forbes Global 2000. Westlake Chemical operates in two segments: Olefins and Vinyls, and is also an integrated producer of vinyls, with substantial downstream integration into polyvinyl chloride (PVC) building products.
Source: Wikipedia (CC BY-SA 4.0) · copied on Sep 3, 2026 · may not reflect recent changes.
The 25 most recent filings (of 1,608)
Every SEC filing, newest first, with what it is. Below, each type with its own explanation.
- Sep 29, 268-K ↗Current report · Restructuring plan with committed costs
- Sep 1, 26Form 4 ↗Insider transaction
- Aug 31, 26Form 3 ↗Insider transaction
- Aug 31, 268-K ↗Current report · A senior executive left or was appointed
Insider transaction · 10 Form 4 filingsshow all 10hide
- Aug 17, 26Form 4 ↗Insider transaction
- Aug 17, 26Form 4 ↗Insider transaction
- Aug 17, 26Form 4 ↗Insider transaction
- Aug 17, 26Form 4 ↗Insider transaction
- Aug 17, 26Form 4 ↗Insider transaction
- Aug 17, 26Form 4 ↗Insider transaction
- Aug 17, 26Form 4 ↗Insider transaction
- Aug 17, 26Form 4 ↗Insider transaction
- Aug 17, 26Form 4 ↗Insider transaction
- Aug 17, 26Form 4 ↗Insider transaction
- Aug 11, 26Form 144 ↗Notice of proposed sale
Insider transaction · 10 Form 4 filingsshow all 10hide
- Aug 11, 26Form 4 ↗Insider transaction
- Aug 10, 26Form 4 ↗Insider transaction
- Aug 10, 26Form 4 ↗Insider transaction
- Aug 10, 26Form 4 ↗Insider transaction
- Aug 10, 26Form 4 ↗Insider transaction
- Aug 10, 26Form 4 ↗Insider transaction
- Aug 10, 26Form 4 ↗Insider transaction
- Aug 10, 26Form 4 ↗Insider transaction
- Aug 10, 26Form 4 ↗Insider transaction
- Aug 10, 26Form 4 ↗Insider transaction
1,608 filings on record, the oldest from Mar 9, 04.
Listing the 25 most recent filings of the 1,608 on record.
56534
- Sep 29, 26Restructuring plan with committed costs+1 more in the same filing8-K 2.05 ↗
- Aug 31, 26A senior executive left or was appointed8-K 5.02 ↗
- Apr 20, 26A senior executive left or was appointed+2 more in the same filing8-K 5.02 ↗
- Apr 6, 26Took on a new financial obligation+3 more in the same filing8-K 2.03 ↗
- Apr 2, 26A senior executive left or was appointed8-K 5.02 ↗
- Feb 23, 26A senior executive left or was appointed+2 more in the same filing8-K 5.02 ↗
- Dec 15, 25Restructuring plan with committed costs+2 more in the same filing8-K 2.05 ↗
- Nov 5, 25Entered a material agreement+2 more in the same filing8-K 1.01 ↗
- Jun 17, 25Restructuring plan with committed costs8-K 2.05 ↗
4 senior executive changes2024 – 2025show all 4hide
- Apr 16, 25A senior executive left or was appointed8-K 5.02 ↗
- Mar 4, 25A senior executive left or was appointed8-K 5.02 ↗
- Dec 11, 24A senior executive left or was appointed+1 more in the same filing8-K 5.02 ↗
- Aug 12, 24A senior executive left or was appointed8-K 5.02 ↗
- Jul 29, 24Restructuring plan with committed costs8-K 2.05 ↗
6 senior executive changes2023 – 2024show all 6hide
- Jul 15, 24A senior executive left or was appointed+2 more in the same filing8-K 5.02 ↗
- May 29, 24A senior executive left or was appointed8-K 5.02 ↗
- Apr 25, 24A senior executive left or was appointed8-K 5.02 ↗
- May 16, 23A senior executive left or was appointed+3 more in the same filing8-K 5.02 ↗
- Apr 5, 23A senior executive left or was appointed8-K 5.02 ↗
- Feb 21, 23A senior executive left or was appointed8-K 5.02 ↗
5 older filings not shown · The record reaches back to Sep 15, 05.
Stress disclosures older than the timeline above. They are individual events from the record, not a complete timeline: there may be more between them.
- Jun 29, 12A debt obligation was accelerated+1 more in the same filing8-K 2.04 ↗
The full record holds 5 stress filings.
Corporate events are tracked from 2004-08-23, when the SEC renumbered 8-K items. Earlier filings use an incompatible numbering and are not classified here.
Sale intention announced
On Aug 11, ALBERT Y CHAO filed notice of intent to sell up to $3.1M. That is about 0.03% of shares outstanding.
A notice is not a sale: it may not go ahead, may happen in part, or at a different price.
After the notice, they sold $3.1M across 2 trades on Aug 11, per their Form 4. That is 100% of the shares announced so far, and the window is still open.
Stock compensation, tax and giftsshow the 34 other transactionshide
Stock compensation, tax withholding, option exercises and gifts. They are listed separately and are not included in the purchase and sale totals. The type describes the transaction, not the filer's intent.
- Aug 11, 26Compensation$2.4MAlbert ChaoExecutive Chairman↗
- Aug 8, 26Compensationamount n/aCatherine T. Chao↗
- Aug 8, 26Compensationamount n/aDavid Tsung-Hung Chao↗
- Aug 8, 26Compensationamount n/aROGER A CREGG↗
- Aug 8, 26Compensationamount n/aMichael J Graff↗
- Aug 8, 26Compensationamount n/aKimberly S Lubel↗
- Aug 8, 26Compensationamount n/aMARK A MCCOLLUM↗
- Aug 8, 26Compensationamount n/aR BRUCE NORTHCUTT↗
- Aug 8, 26Compensationamount n/aCarolyn Chao Sabat↗
- Aug 8, 26Compensationamount n/aJeffrey Wayne Sheets↗
- May 13, 26Tax$514KMark Steven BenderEVP & CFO↗
- May 12, 26Compensationamount n/aMark Steven BenderEVP & CFO↗
- Feb 27, 26Compensation$408KMark Steven BenderEVP & CFO↗
- Feb 27, 26Compensation$562KMark Steven BenderEVP & CFO↗
- Feb 27, 26Other$1.2MMark Steven BenderEVP & CFO↗
- Feb 20, 26Tax$148KJames ChaoSenior Chairman↗
- Feb 20, 26Tax$235KAlbert ChaoExecutive Chairman↗
- Feb 20, 26Tax$9KJohn Tsung-chen Chao↗
- Feb 20, 26Tax$42KMark Steven BenderEVP & CFO↗
- Feb 20, 26Tax$31KRobert F. BuesingerEVP, PEM Segment Head↗
- Feb 20, 26Tax$34KL. Benjamin EderingtonEVP, Legal & External Affairs↗
- Feb 20, 26Tax$8KJeffrey Adam HolyVP and CAO↗
- Feb 20, 26Tax$9KScott Thomas SzwejbkaSVP, HIP Segment Head↗
- Feb 19, 26Compensationamount n/aJames ChaoSenior Chairman↗
- Feb 19, 26Compensationamount n/aAlbert ChaoExecutive Chairman↗
- Feb 19, 26Compensationamount n/aJohn Tsung-chen Chao↗
- Feb 19, 26Compensationamount n/aMark Steven BenderEVP & CFO↗
- Feb 19, 26Compensationamount n/aRobert F. BuesingerEVP, PEM Segment Head↗
- Feb 19, 26Compensationamount n/aL. Benjamin EderingtonEVP, Legal & External Affairs↗
- Feb 19, 26Compensationamount n/aJeffrey Adam HolyVP and CAO↗
- Feb 19, 26Compensationamount n/aScott Thomas SzwejbkaSVP, HIP Segment Head↗
- Feb 18, 26Tax$120KMark Steven BenderEVP & CFO↗
- Feb 18, 26Tax$89KRobert F. BuesingerEVP, PEM Segment Head↗
- Feb 18, 26Tax$504KAlbert ChaoExecutive Chairman↗
The full record holds 303 transactions and goes back to Feb 15, 22.
Its sector and its market
Westlake Corporation among Materials companies
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- 250 clean closes in the period.
- SEC records
- 1,608 documents on file, from Mar 9, 2004 to Sep 29, 2026.
- Company description
- Wikipedia, read on Sep 3, 2026.
- This page
- Generated on Oct 19, 2026; refreshed through the day.
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Which SEC documents appear here?
Those filed with the SEC by the company, its insiders and its major shareholders, within our coverage: periodic reports (10-K, 10-Q, 20-F), material events (8-K), proposed sale notices (Form 144), insider transactions (Form 4) and stakes above 5% (13D/13G). Each links to the original on EDGAR.
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