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SEC Form 4 research

WESTLAKE CHEMICAL CORP insider transactions

Inspect WESTLAKE CHEMICAL CORP's public SEC insider acquisitions and sales, reporting owners and source receipts.

As of 2026-10-15T08:02:39.132Z

Issuer CIK
0001262823
Reporting owners
48
Officers and directors
15
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What is a Form 4?

Animation: what a Form 4 is, shown with one real example. Sonic Automotive (SAH) reporting owner Paul P. Rusnak bought 13,701 shares at $59.78 on Wednesday, October 7, 2026, transaction code P, an open-market purchase (S is a sale and A is an award from the company). A timeline marks the SEC's two-business-day filing deadline, which ends Friday, October 9. The SEC accepted the Form 4 at 4:33:21 PM ET on October 9, and NexusTrade treats it as public one minute later, at 4:34:21 PM ET. A lamp for NexusTrade's InsiderTrades indicator stays off from the trade date until that moment, then counts one purchase worth 13,701 × $59.78 = $819,045.78.
In this example the shares were bought on Oct 7, 2026, and NexusTrade's InsiderTrades indicator can count the purchase starting at 4:34:21 PM ET on Oct 9, one minute after the SEC accepted the Form 4.

A Form 4 is the SEC filing a company insider, such as an officer, director or 10% owner, uses to report a trade in the company's stock, generally within two business days. The animation follows one real filing as an example: Paul P. Rusnak's purchase of Sonic Automotive (SAH) shares on October 7, 2026.

The same reading applies to every row on this page. The trade date is when the shares changed hands. The available date is when NexusTrade treats the filing as public, and a NexusTrade InsiderTrades indicator counts a purchase (code P) or sale (code S) only from that moment. Code A awards are not counted as purchases.

Read one actual disclosure before using it

Show the table · 1 row, 7 columns

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2026-09-022026-08-31Darby TommyA1,791$0Not reported

First displayed source row from Recent insider disclosures. The full bounded history and coverage notes remain below.

The displayed observation date is 2026-08-31 and its public availability date is 2026-09-02. Subtracting those calendar dates gives 2 days of disclosure lag. Historical public research can use the record from the availability date, rather than backdating knowledge to the observation date. The calendar-day difference does not assert an intraday publication time.

This row is code A: a award. An award is an acquisition but is not an open-market purchase. A purchase-following rule must not count it as code P.

Open the linked original receipts to verify the row, then inspect a second record before drawing a pattern. This public filing observation supplies source evidence, not a completed copy-trading return.

SEC accession 0001193125-26-377500 ↗SEC accession 0001193125-26-353632 ↗SEC accession 0001193125-26-353631 ↗

Recent insider disclosures

Inspect all 13 displayed rows: Recent insider disclosures

This table includes purchases, sales and awards in the public filing record. Awards and open-market purchases are distinct transaction codes. For historical research, use the public availability date to determine when the transaction was knowable.

Read code P as a purchase, S as a sale and A as an award. An award is an acquisition, but it is not an open-market purchase. Open the filing receipt to check the transaction details.

Scroll sideways to compare all columns. Select a heading to sort.

2026-09-022026-08-31Darby TommyA1,791$0Not reported
2026-08-182026-08-14Sheets Jeffrey WayneA2,184$0Not reported
2026-08-182026-08-14Sabat Carolyn ChaoA2,184$0Not reported
2026-08-182026-08-14Patel Bhavesh V.A2,184$0Not reported
2026-08-182026-08-14NORTHCUTT R BRUCEA2,184$0Not reported
2026-08-182026-08-14MCCOLLUM MARK AA2,184$0Not reported
2026-08-182026-08-14Lubel Kimberly SA2,184$0Not reported
2026-08-182026-08-14Graff Michael JA2,184$0Not reported
2026-08-182026-08-14CREGG ROGER AA2,184$0Not reported
2026-08-182026-08-14Chao David Tsung-HungA2,184$0Not reported
2026-08-182026-08-14Chao Catherine T.A2,184$0Not reported
2026-08-122026-08-11Chao AlbertS31,384$80.42Not reported
2026-08-122026-08-11Chao AlbertS7,489$79.7Not reported

Most recent 90-day source activity, up to 50 rows. No rows means no matching recent records, not no historical activity.

Officers and directors in the directory

Inspect all 23 displayed rows: Officers and directors in the directory

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Chao David Tsung-Hung00017264183
Kenner Andrew000143974928
BARNETT E WILLIAM000124314721
Bender Mark Steven000133041790
BLAKELY ROBERT T000121802010
Buesinger Robert F.000148858741
Chao Albert0001299403120
Chao James0001299505118
Condon Donald Marion Jr000136837839
Ederington L. Benjamin00015882793
Hansen David R000129863273
Jenkins Dorothy C00012995042
Kearns Roger L.00017391284
LUKENS MAX L000104010120
Mangieri George J000129850452
Mattina Michael J.00016389481
Morse Wayne D000129850312
RILEY H JOHN JR00011735936
Taylor Jeffrey L000129855198
Teel Lawrence E.000155148013
Wallace Stephen000129864513
Wilder Warren W00012984901
Zoeller Johnathan Stevan00018036783
Chao David Tsung-Hung ↗Kenner Andrew ↗BARNETT E WILLIAM ↗Bender Mark Steven ↗BLAKELY ROBERT T ↗Buesinger Robert F. ↗Chao Albert ↗Chao James ↗Condon Donald Marion Jr ↗Ederington L. Benjamin ↗Hansen David R ↗Jenkins Dorothy C ↗Kearns Roger L. ↗LUKENS MAX L ↗Mangieri George J ↗Mattina Michael J. ↗Morse Wayne D ↗RILEY H JOHN JR ↗Taylor Jeffrey L ↗Teel Lawrence E. ↗Wallace Stephen ↗Wilder Warren W ↗Zoeller Johnathan Stevan ↗

Which transactions qualify for the company tracker

The company strategy uses verified officers and directors with qualifying acquisitions at this issuer. Other reporting owners may appear in source records without becoming strategy signals.

Strategy eligibility is held while filing coverage is unresolved.

Historical follower simulations are separate from these source transactions. They do not establish live trading results.