Comparable stake leader
Dorothy C. Jenkins
SEC ownership of WESTLAKE CORP
Top holders, 13D/G large-stake signals, insider positions, and transaction flow tied to CIK 0001262823.
Disclosed value leader
Dorothy C. Jenkins
Comparable rows
0/50
Latest evidence
31 Mar 2026
- Public ticker
- WLK on NYSE
- Parsed ownership sources
-
3/4/5 and 13F
Source: Parsed SEC ownership filingsUse: Compare filing families carefully
- Largest SEC-reported holder
-
Dorothy C. Jenkins
Ranking: Comparable ownership first, then disclosed value
- Latest parsed ownership date
-
31 Mar 2026
Freshness: Most recent filing date in this holder set
- Issuer CIK
- 0001262823
- Issuer location
- Houston, TX
Ownership snapshot
CIK-linked ownership evidence from parsed SEC filings.
1 signal
Issuer
Names, identifiers, and filing context for this profile.
2 identity fields
Ownership snapshot
Top shareholders of WESTLAKE CORP (13F + 13D/G + 3/4/5)
Grouped by holder across the latest SEC ownership disclosures. Start with comparable ownership when available, then verify the linked 13F, 13D/G, or 3/4/5 evidence.
Comparable stake leader
Dorothy C. Jenkins
Disclosed value leader
Dorothy C. Jenkins
Comparable rows
0/50
Latest evidence
31 Mar 2026
3/4/5
13F
Highest disclosed value: $12,071,920,935
50 rows are not safely comparable across share classes.
Showing 1-8 of 50 holder rows.
Quick read
Dorothy C. Jenkins has the largest disclosed position value at $12.07B.
0 of 50 rows have a safely comparable ownership percentage. Use this as a filing-backed starting point, then open the detailed table for source links, reporting role, position value, share count, and filing date.
Open SEC evidence
Opens Dorothy C. Jenkins's linked filing trail.
Disclosed position value
Top 5
Dorothy C. Jenkins
$12.07B
Orbis Allan Gray Ltd
$618.39M
Capital World Investors
$491.93M
BlackRock, Inc.
$359.7M
PRICE T ROWE ASSOCIATES INC /MD/
$281.24M
Value bars compare disclosed positions; verify each figure against the linked filing evidence.
Detailed SEC evidence table Showing 1-8 of 50 holder rows
| Holder | Evidence | Ownership % | Position | 12M Net Δ | As of |
|---|---|---|---|---|---|
| Dorothy C. Jenkins |
3/4/5
Director, 10%+ Owner
|
—
class O/S missing
|
$12,071,920,935
93,479,332 shares
|
— | 12 Aug 2022 |
| Orbis Allan Gray Ltd |
13F
Company
|
—
class O/S missing
|
$618,388,890
5,293,519 shares
|
— | 31 Mar 2026 |
| Capital World Investors |
13F
Company
|
—
class O/S missing
|
$491,929,721
4,211,006 shares
|
— | 31 Mar 2026 |
| BlackRock, Inc. |
13F
Company
|
—
class O/S missing
|
$359,698,953
3,079,087 shares
|
— | 31 Mar 2026 |
| PRICE T ROWE ASSOCIATES INC /MD/ |
13F
Company
|
—
class O/S missing
|
$281,240,000
2,407,457 shares
|
— | 31 Mar 2026 |
| BRANDES INVESTMENT PARTNERS, LP |
13F
Company
|
—
class O/S missing
|
$215,259,803
1,842,650 shares
|
— | 31 Mar 2026 |
| WELLINGTON MANAGEMENT GROUP LLP |
13F
Company
|
—
class O/S missing
|
$209,518,656
1,793,517 shares
|
— | 31 Mar 2026 |
| VANGUARD PORTFOLIO MANAGEMENT LLC |
13F
Company
|
—
class O/S missing
|
$206,748,971
1,769,808 shares
|
— | 31 Mar 2026 |
How to read this table
Rows are grouped by holder and ranked first by SEC-reported ownership % when it is safely comparable, then by disclosed holdings value. — indicates unavailable or non-comparable values; "mixed-class rows" means the latest filing spans non-comparable classes.
Forms 3/4/5 flow
Insider trading overview
Net insider flow leans to selling over the last 12 months. Net value: -$7,069,407.
Buys
$0
Insiders: 0
Sells
$7,069,407
Insiders: 3
Net
-$7,069,407
Shares: -78,658
Window
Last 12 months
4 rolling buckets
Buy value
Sell value
Shares: 0
Shares: 78,658
| Window (months) | Buy shares | Sell shares | Buy value | Sell value | Net value |
|---|---|---|---|---|---|
| 0-3 | 0 | 0 | $0 | $0 | $0 |
| 3-6 | 0 | 37,822 | $0 | $4,065,034 | -$4,065,034 |
| 6-9 | 0 | 40,836 | $0 | $3,004,373 | -$3,004,373 |
| 9-12 | 0 | 0 | $0 | $0 | $0 |
Reporting owners
Insider holders from Forms 3/4/5
Showing 1-20 of 27 reporting-owner rows connected to WESTLAKE CORP. Open a relationship link for the CIK-to-CIK filing trail.
Rows
27
Largest Forms 3/4/5 holder
Dorothy C. Jenkins
Net 12M change
-$7,069,407
Latest report
15 Jun 2026
| Name | Relationship | Holdings Value | Past Year Net Change | Change % | Valuation | Report Date |
|---|---|---|---|---|---|---|
| Dorothy C. Jenkins | Director, 10%+ Owner | $12,071,920,935 | Mixed | 12 Aug 2022 | ||
| Albert Chao | Executive Chairman, Director | $61,857,724 | -$3,004,373 | -4.6% | Mixed | 19 Feb 2026 |
| L. Benjamin Ederington | EVP, Legal & External Affairs | $8,181,618 | Mixed | 19 Feb 2026 | ||
| James Chao | Senior Chairman, Director | $6,045,857 | Mixed | 19 Feb 2026 | ||
| Roger L. Kearns | COO and EVP, PEM | $5,882,456 | Mixed | 17 Feb 2023 | ||
| Robert F. Buesinger | EVP, PEM Segment Head | $5,831,561 | -$461,000 | -7.3% | Mixed | 30 Mar 2026 |
| Mark Steven Bender | Evp & Cfo | $4,913,902 | -$3,604,034 | -42% | Mixed | 12 May 2026 |
| Andrew Kenner | SVP, Operations | $2,915,982 | Mixed | 18 Feb 2022 | ||
| David Tsung-Hung Chao | Director | $2,230,530 | Mixed | 08 Aug 2025 | ||
| Scott Thomas Szwejbka | SVP, HIP Segment Head | $2,224,849 | Mixed | 19 Feb 2026 | ||
| Thomas J. Janssens | SVP, Ops - PEM & Corp Logistic | $2,108,330 | Mixed | 20 Feb 2025 | ||
| Chao Catherine T. | Director | $1,968,235 | Mixed | 08 Aug 2025 | ||
| Marius Haas | Director | $1,843,514 | Mixed | 09 Aug 2024 | ||
| R. Bruce Northcutt | Director | $1,667,525 | Mixed | 08 Aug 2025 | ||
| Michael J. Graff | Director | $1,664,298 | Mixed | 08 Aug 2025 | ||
| Jeffrey Wayne Sheets | Director | $1,004,388 | Mixed | 08 Aug 2025 | ||
| Jean-Marc Gilson | President and CEO | $994,197 | Mixed | 20 Feb 2026 | ||
| Kimberly S. Lubel | Director | $917,324 | Mixed | 08 Aug 2025 | ||
| John Tsung-Chen Chao | Director | $843,846 | Mixed | 19 Feb 2026 | ||
| Mark A. Mccollum | Director | $760,120 | Mixed | 08 Aug 2025 |
Recent insider transactions for WESTLAKE CORP
Showing up to 300 recent insider transactions from the last 12 months.
| Insider | Symbol | Class | Transaction | % | SEC-reported value | SEC-reported price | Shares | Shares owned | Date | Ownership |
|---|---|---|---|---|---|---|---|---|---|---|
| Jonathan Baksht | WLK | Restricted Stock Units | Award | 20,580 | 20,580 | 15 Jun 2026 | Direct | |||
| Mark Steven Bender | WLK | Common Stock | Tax liability | -12.8% | -5,284 | 35,895 | 13 May 2026 | Direct | ||
| Mark Steven Bender | WLK | Common Stock | Options Exercise | 47% | 13,164 | 41,179 | 12 May 2026 | Direct | ||
| Mark Steven Bender | WLK | Restricted Stock Units | Options Exercise | -100% | -13,164 | 0 | 12 May 2026 | Direct | ||
| Brian John Powers | WLK | Restricted Stock Units | Award | 1,961 | 1,961 | 02 Apr 2026 | Direct | |||
| Robert F. Buesinger | WLK | Common Stock | Sale | -10.4% | $461,000 | $115.25 | -4,000 | 34,482 | 27 Mar 2026 | Direct |
| Mark Steven Bender | WLK | Common Stock | Sale | -36.9% | $1,847,037 | $112.54 | -16,413 | 28,015 | 27 Mar 2026 | Direct |
| Mark Steven Bender | WLK | Common Stock | Sale | -28.2% | $1,756,997 | $100.92 | -17,409 | 44,433 | 27 Feb 2026 | Direct |
| Mark Steven Bender | WLK | Common Stock | Disposed to Issuer | -17% | -12,693 | 61,842 | 27 Feb 2026 | Direct | ||
| Mark Steven Bender | WLK | Common Stock | Options Exercise | 20.5% | 12,693 | 74,535 | 27 Feb 2026 | Direct | ||
| Mark Steven Bender | WLK | Employee Option (right to buy) | Options Exercise | -100% | -12,693 | 0 | 27 Feb 2026 | Direct | ||
| Bhavesh Patel V | WLK | Restricted Stock Units | Award | 1,852 | 1,852 | 20 Feb 2026 | Direct | |||
| Scott Thomas Szwejbka | WLK | Common Stock | Tax liability | -0.66% | -91 | 13,773 | 20 Feb 2026 | Direct | ||
| Scott Thomas Szwejbka | WLK | Restricted Stock Units | Award | 3,983 | 3,983 | 20 Feb 2026 | Direct | |||
| Scott Thomas Szwejbka | WLK | Employee Option (right to buy) | Award | 14,595 | 14,595 | 20 Feb 2026 | Direct | |||
| Jeffrey Adam Holy | WLK | Common Stock | Tax liability | -1.56% | -81 | 5,124 | 20 Feb 2026 | Direct | ||
| Jeffrey Adam Holy | WLK | Restricted Stock Units | Award | 3,739 | 2,540 | 20 Feb 2026 | Direct | |||
| Jeffrey Adam Holy | WLK | Employee Option (right to buy) | Award | 4,394 | 4,394 | 20 Feb 2026 | Direct | |||
| Jean-Marc Gilson | WLK | Restricted Stock Units | Award | 29,784 | 29,784 | 20 Feb 2026 | Direct | |||
| Jean-Marc Gilson | WLK | Employee Option (right to buy) | Award | 109,139 | 109,139 | 20 Feb 2026 | Direct | |||
| L. Benjamin Ederington | WLK | Common Stock | Tax liability | -0.44% | -357 | 80,158 | 20 Feb 2026 | Direct | ||
| L. Benjamin Ederington | WLK | Restricted Stock Units | Award | 7,002 | 7,002 | 20 Feb 2026 | Direct | |||
| L. Benjamin Ederington | WLK | Employee Option (right to buy) | Award | 25,656 | 25,656 | 20 Feb 2026 | Direct | |||
| Robert F. Buesinger | WLK | Common Stock | Tax liability | -0.84% | -326 | 38,482 | 20 Feb 2026 | Direct | ||
| Robert F. Buesinger | WLK | Restricted Stock Units | Award | 5,281 | 5,281 | 20 Feb 2026 | Direct | |||
| Robert F. Buesinger | WLK | Employee Option (right to buy) | Award | 19,351 | 19,351 | 20 Feb 2026 | Direct | |||
| Mark Steven Bender | WLK | Common Stock | Tax liability | -0.71% | -445 | 61,842 | 20 Feb 2026 | Direct | ||
| Mark Steven Bender | WLK | Restricted Stock Units | Award | 7,747 | 7,747 | 20 Feb 2026 | Direct | |||
| Mark Steven Bender | WLK | Employee Option (right to buy) | Award | 28,389 | 28,389 | 20 Feb 2026 | Direct | |||
| John Tsung-Chen Chao | WLK | Common Stock | Tax liability | -1.14% | -91 | 7,888 | 20 Feb 2026 | Direct | ||
| John Tsung-Chen Chao | WLK | Restricted Stock Units | Award | 3,538 | 2,434 | 20 Feb 2026 | Direct | |||
| John Tsung-Chen Chao | WLK | Employee Option (right to buy) | Award | 4,044 | 4,044 | 20 Feb 2026 | Direct | |||
| Albert Chao | WLK | Common Stock | Tax liability | -0.39% | -2,501 | 642,880 | 20 Feb 2026 | Direct | ||
| Albert Chao | WLK | Restricted Stock Units | Award | 14,945 | 14,945 | 20 Feb 2026 | Direct | |||
| Albert Chao | WLK | Employee Option (right to buy) | Award | 54,763 | 54,763 | 20 Feb 2026 | Direct | |||
| James Chao | WLK | Common Stock | Tax liability | -3.06% | -1,569 | 49,774 | 20 Feb 2026 | Direct | ||
| James Chao | WLK | Restricted Stock Units | Award | 7,472 | 7,472 | 20 Feb 2026 | Direct | |||
| James Chao | WLK | Employee Option (right to buy) | Award | 27,382 | 27,382 | 20 Feb 2026 | Direct | |||
| Scott Thomas Szwejbka | WLK | Common Stock | Award | 2.7% | 365 | 13,864 | 19 Feb 2026 | Direct | ||
| Jeffrey Adam Holy | WLK | Common Stock | Award | 5.34% | 264 | 5,205 | 19 Feb 2026 | Direct | ||
| L. Benjamin Ederington | WLK | Common Stock | Award | 1.8% | 1,425 | 80,515 | 19 Feb 2026 | Direct | ||
| Robert F. Buesinger | WLK | Common Stock | Award | 3.47% | 1,301 | 38,808 | 19 Feb 2026 | Direct | ||
| Mark Steven Bender | WLK | Common Stock | Award | 2.94% | 1,777 | 62,287 | 19 Feb 2026 | Direct | ||
| John Tsung-Chen Chao | WLK | Common Stock | Award | 2.74% | 213 | 7,979 | 19 Feb 2026 | Direct | ||
| Albert Chao | WLK | Common Stock | Award | 0.97% | 6,193 | 645,381 | 19 Feb 2026 | Direct | ||
| James Chao | WLK | Common Stock | Award | 8.18% | 3,884 | 51,343 | 19 Feb 2026 | Direct | ||
| Scott Thomas Szwejbka | WLK | Common Stock | Tax liability | -2.14% | -295 | 13,499 | 18 Feb 2026 | Direct | ||
| Jeffrey Adam Holy | WLK | Common Stock | Tax liability | -4.13% | -213 | 4,941 | 18 Feb 2026 | Direct | ||
| L. Benjamin Ederington | WLK | Common Stock | Tax liability | -1.22% | -978 | 79,090 | 18 Feb 2026 | Direct | ||
| James Chao | WLK | Common Stock | Tax liability | -5.31% | -2,664 | 47,459 | 18 Feb 2026 | Direct |
* marks a reported price that did not pass the local price check.