Westlake Corporation
Westlake Corporation (WLK) Insider Trading
Form 4 buy vs sell counts, ratio, and sentiment — switch this quarter or last 12 months; chart and transactions below.
SEC EDGAR · FMP · WLK · as of Jun 8, 2026
Activity summary
Buy transactions
0
P-Purchase only
Sell transactions
7
12 Months
Buy/Sell ratio
0.00
Buy/Sell (by trades)
Overall sentiment
Westlake Corporation insiders have been primarily selling shares over the past 12 Months. Selling activity is often driven by pre-scheduled Rule 10b5-1 plans rather than negative sentiment toward the company.
▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · Buy = P-Purchase only · Sell = S-Sale only
As of Jun 8, 2026
WLK insider buying and selling by quarter
WLK insider selling · WLK insider buying stocks · quarterly insider activity
Mobile shows last 4Q · Desktop shows full 8Q
▸ Source: SEC EDGAR · Form 3 & 4 · via Financial Modeling Prep · last 8 quarters
As of Jun 8, 2026
Active insiders
Most active in past 12 months · WLK ceo insider trading
Showing all insiders · Click a card to filter the transactions table below
▸ Aggregated from reportingName · top 5 by trade count (12M) · no extra API
Recent insider transactions
WLK executive sell shares · WLK board member insider trading · WLK insider trading SEC filing
Scroll horizontally to see all columns
| Date | Insider | Type | Shares | Value | Filing |
|---|---|---|---|---|---|
| May 12, 2026 | Bender Mark Steven EVP & CFO | Option | 13,164 | — | Form 4 |
| May 13, 2026 | Bender Mark Steven EVP & CFO | Other | 5,284 | $514K | Form 4 |
| Mar 27, 2026 | Buesinger Robert F. EVP, PEM Segment Head | Sale | 4,000 | $461K | Form 4 |
| Mar 27, 2026 | Bender Mark Steven EVP & CFO | Sale | 16,413 | $1.85M⚡ | Form 4 |
| Feb 27, 2026 | Bender Mark Steven EVP & CFO | Option | 6,494 | $562K | Form 4 |
| Feb 27, 2026 | Bender Mark Steven EVP & CFO | Option | 6,199 | $408K | Form 4 |
| Feb 27, 2026 | Bender Mark Steven EVP & CFO | Other | 12,693 | $1.25M⚡ | Form 4 |
| Feb 27, 2026 | Bender Mark Steven EVP & CFO | Sale | 16,988 | $1.71M⚡ | Form 4 |
| Feb 27, 2026 | Bender Mark Steven EVP & CFO | Sale | 421 | $43K | Form 4 |
| Feb 19, 2026 | Szwejbka Scott Thomas SVP, HIP Segment Head | Award | 365 | — | Form 4 |
| Feb 20, 2026 | Szwejbka Scott Thomas SVP, HIP Segment Head | Other | 91 | $9K | Form 4 |
| Feb 19, 2026 | Holy Jeffrey Adam VP and CAO | Award | 264 | — | Form 4 |
| Feb 20, 2026 | Holy Jeffrey Adam VP and CAO | Other | 81 | $8K | Form 4 |
| Feb 19, 2026 | Ederington L. Benjamin EVP, Legal & External Affairs | Award | 1,425 | — | Form 4 |
| Feb 20, 2026 | Ederington L. Benjamin EVP, Legal & External Affairs | Other | 357 | $34K | Form 4 |
| Feb 19, 2026 | Buesinger Robert F. EVP, PEM Segment Head | Award | 1,301 | — | Form 4 |
| Feb 20, 2026 | Buesinger Robert F. EVP, PEM Segment Head | Other | 326 | $31K | Form 4 |
| Feb 19, 2026 | Bender Mark Steven EVP & CFO | Award | 1,777 | — | Form 4 |
| Feb 20, 2026 | Bender Mark Steven EVP & CFO | Other | 445 | $42K | Form 4 |
| Feb 19, 2026 | Chao John Tsung-chen Director | Award | 213 | — | Form 4 |
| Feb 20, 2026 | Chao John Tsung-chen Director | Other | 91 | $9K | Form 4 |
| Feb 19, 2026 | Chao Albert Executive Chairman · Director | Award | 6,193 | — | Form 4 |
| Feb 20, 2026 | Chao Albert Executive Chairman · Director | Other | 2,501 | $235K | Form 4 |
| Feb 19, 2026 | Chao James Senior Chairman · Director | Award | 3,884 | — | Form 4 |
| Feb 20, 2026 | Chao James Senior Chairman · Director | Other | 1,569 | $148K | Form 4 |
Buesinger Robert F.
EVP, PEM Segment Head
Date
Mar 27
Shares
4,000
Price
$115.25
Value
$461K
Bender Mark Steven
EVP & CFO
Date
Mar 27
Shares
16,413
Price
$112.53
Value
$1.85M ⚡
Bender Mark Steven
EVP & CFO
Date
Feb 27
Shares
12,693
Price
$98.20
Value
$1.25M ⚡
Bender Mark Steven
EVP & CFO
Date
Feb 27
Shares
16,988
Price
$100.91
Value
$1.71M ⚡
Szwejbka Scott Thomas
SVP, HIP Segment Head
Date
Feb 19
Shares
365
Price
—
Value
—
Szwejbka Scott Thomas
SVP, HIP Segment Head
Date
Feb 20
Shares
91
Price
$94.10
Value
$9K
Ederington L. Benjamin
EVP, Legal & External Affairs
Date
Feb 19
Shares
1,425
Price
—
Value
—
Ederington L. Benjamin
EVP, Legal & External Affairs
Date
Feb 20
Shares
357
Price
$94.10
Value
$34K
Buesinger Robert F.
EVP, PEM Segment Head
Date
Feb 19
Shares
1,301
Price
—
Value
—
Buesinger Robert F.
EVP, PEM Segment Head
Date
Feb 20
Shares
326
Price
$94.10
Value
$31K
Chao Albert
Executive Chairman · Director
Date
Feb 19
Shares
6,193
Price
—
Value
—
Chao Albert
Executive Chairman · Director
Date
Feb 20
Shares
2,501
Price
$94.10
Value
$235K
Chao James
Senior Chairman · Director
Date
Feb 20
Shares
1,569
Price
$94.10
Value
$148K
⚡ = value ≥ $1M · Award/Option price shows — · formType=4 · securityName=Common Stock · url → sec.gov/Archives/edgar
▸ Source: SEC EDGAR · Form 4 filings · ⚡ = value ≥ $1M · Award/Option price shows —
About WLK insider trading
WLK insider trades
Westlake Corporation (WLK) insider trading data is sourced from SEC Form 4 filings submitted by corporate insiders, including Bender Mark Steven (EVP & CFO), Chao Albert (Executive Chairman · Director), Szwejbka Scott Thomas (SVP, HIP Segment Head). Over the past 12 months, 5 insiders have filed transactions with the SEC. WLK insiders have been primarily selling, which may reflect pre-scheduled Rule 10b5-1 plan executions.
For Westlake Corporation's institutional ownership breakdown and insider ownership percentage, see the Ownership tab → Ownership tab →
Frequently asked questions
WLK insider trading · 5 questionsThe insiders of Westlake Corporation (WLK) include executives and directors such as Bender Mark Steven (EVP & CFO), Chao Albert (Executive Chairman · Director), Szwejbka Scott Thomas (SVP, HIP Segment Head), among others. Over the past 12 months, 5 insiders have filed Form 4 transactions with the SEC. Insider transactions are required to be reported within 2 business days of the trade date.
▸ Source: FMP /stable/insider-trading/search · SEC EDGAR Form 3 & 4 · acquisitionOrDisposition A=Buy, D=Sell · RSU vesting (M-Exempt) excluded from sentiment bar · As of Jun 8, 2026