Public ownership evidence

Westlake Corporation (WLK) Ownership Disclosures

Read WLK insider transactions, institutional 13F filings and Congressional disclosures with report dates, public availability and original receipts.

As of 2026-10-10T12:08:28.848Z

Separate the three disclosure sources

Step 1 of 3

Recent Form 4 activity

Westlake Corporation: source evidence dated 2026-10-10T12:08:28.848Z.

Available
2026-09-02
Trade date
2026-08-31
Reporting owners
Darby Tommy
Code
A
Shares
1,791
Reported value
Not reported
What you should see

The displayed owner or issuer and source fields identify the receipt to verify; keep reporting and availability dates separate.

Step 2 of 3

Is this an insider transaction, 13F holding, or Congressional event?

Each source has different dates and units. Raw ticker-matched receipts, including amendments, are not deduplicated current ownership totals.

SEC 0001193125-26-377500
What you should see

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Step 3 of 3

Read WLK fundamentals

Follow the source receipt or manager/member profile. Avoid combining transaction value and 13F position value into an ownership percentage.

Read WLK fundamentals
What you should see

Keep reporting dates and units beside the answer, and inspect its original citations.

Recent Form 4 activity

See the complete recent form 4 activity
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2026-09-022026-08-31Darby TommyA1,791Not reported
2026-08-182026-08-14Sheets Jeffrey WayneA2,184Not reported
2026-08-182026-08-14Sabat Carolyn ChaoA2,184Not reported
2026-08-182026-08-14Patel Bhavesh V.A2,184Not reported
2026-08-182026-08-14NORTHCUTT R BRUCEA2,184Not reported
2026-08-182026-08-14MCCOLLUM MARK AA2,184Not reported
2026-08-182026-08-14Lubel Kimberly SA2,184Not reported
2026-08-182026-08-14Graff Michael JA2,184Not reported
2026-08-182026-08-14CREGG ROGER AA2,184Not reported
2026-08-182026-08-14Chao David Tsung-HungA2,184Not reported
2026-08-182026-08-14Chao Catherine T.A2,184Not reported
2026-08-122026-08-11Chao AlbertS31,384Not reported
2026-08-122026-08-11Chao AlbertS7,489Not reported

90-day public availability window, up to 50 records.

Recent institutional filing receipts

These are raw ticker-matched positions in recent 13F receipts, including amendments. They are not deduplicated current ownership totals. Open the manager profile to inspect its effective filing book.

Show the table · 50 rows, 6 columns

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Advisors Asset Management, Inc.2021-12-312026-08-2829,510$2,866,306None
Advisors Asset Management, Inc.2022-12-312026-08-2822,269$2,283,463None
Advisors Asset Management, Inc.2020-06-302026-08-283,295$176,777None
Advisors Asset Management, Inc.2022-06-302026-08-2825,221$2,472,000None
Advisors Asset Management, Inc.2021-09-302026-08-2828,443$2,592,000None
Corient Private Wealth LP2026-06-302026-08-288,143$594,439None
Principia Wealth Advisory, LLC2026-06-302026-08-278$584None
Principia Wealth Advisory, LLC2026-03-312026-08-278$935None
Advisors Asset Management, Inc.2024-03-312026-08-275,554$848,651None
Advisors Asset Management, Inc.2025-03-312026-08-277,622$762,429None
Advisors Asset Management, Inc.2022-09-302026-08-2725,656$2,229,000None
Advisors Asset Management, Inc.2020-12-312026-08-2717,422$1,422,000None
Advisors Asset Management, Inc.2022-03-312026-08-2722,403$2,764,530None
Advisors Asset Management, Inc.2023-06-302026-08-2713,490$1,611,650None
Advisors Asset Management, Inc.2023-09-302026-08-277,755$966,816None
Advisors Asset Management, Inc.2023-03-312026-08-2722,429$2,601,315None
Advisors Asset Management, Inc.2021-03-312026-08-2724,352$2,162,214None
Advisors Asset Management, Inc.2021-06-302026-08-2726,820$2,416,000None
Advisors Asset Management, Inc.2020-09-302026-08-275,000$316,100None
Advisors Asset Management, Inc.2025-09-302026-08-277,621$587,274None
Advisors Asset Management, Inc.2023-12-312026-08-275,463$764,601None
Advisors Asset Management, Inc.2019-12-312026-08-2621,422$1,502,753None
Advisors Asset Management, Inc.2025-06-302026-08-257,647$580,637None
First Eagle Investment Management, LLC2026-06-302026-08-252,784$203,232None
First Eagle Investment Management, LLC2026-06-302026-08-2551$3,723None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-2536,900$2,693,700None
CALIFORNIA STATE TEACHERS RETIREMENT SYSTEM2026-06-302026-08-252,693,700$36,900,000None
Advisors Asset Management, Inc.2024-09-302026-08-227,550$1,134,690None
Advisors Asset Management, Inc.2024-06-302026-08-226,620$958,708None
Advisors Asset Management, Inc.2024-12-312026-08-227,206$826,168None
Advisors Asset Management, Inc.2025-12-312026-08-226,047$447,115None
Advisors Asset Management, Inc.2020-03-312026-08-223,432$130,999None
Assenagon Asset Management S.A.2026-06-302026-08-2255,289$4,036,097None
MERCER GLOBAL ADVISORS INC /ADV2026-06-302026-08-2026,477$1,932,790None
Advisors Asset Management, Inc.2019-03-312026-08-1935,166$2,386,365None
Advisors Asset Management, Inc.2019-09-302026-08-1925,668$1,681,767None
Advisors Asset Management, Inc.2019-06-302026-08-1929,076$2,019,619None
Kimelman & Baird, LLC2026-06-302026-08-191,500$109,500None
Corient Private Wealth LP2026-06-302026-08-185,951$434,423None
Transamerica Financial Advisors, LLC2026-06-302026-08-181,095$79,988None
CAPSTONE INVESTMENT ADVISORS, LLC2026-06-302026-08-184,721$344,633None
PUBLIC EMPLOYEES RETIREMENT SYSTEM OF OHIO2026-06-302026-08-189,392$685,616None
Odyssean, LLC2026-06-302026-08-152,903$211,919None
DARK FOREST CAPITAL MANAGEMENT LP2026-06-302026-08-156,817$497,641None
SummitTX Capital, L.P.2026-06-302026-08-159,414$687,222None
Graham Capital Management, L.P.2026-06-302026-08-1510,704$781,392None
SEI INVESTMENTS CO2026-06-302026-08-1510,057$734,161None
SEI INVESTMENTS CO2026-06-302026-08-15839$61,310None
Federation des caisses Desjardins du Quebec2026-06-302026-08-152,272$165,856None
Advisors Asset Management, Inc.2026-06-302026-08-151,949$142,277None

90-day public filing window, up to 50 source positions.

Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗Corient Private Wealth LP ↗Principia Wealth Advisory, LLC ↗Principia Wealth Advisory, LLC ↗Advisors Asset Management, Inc. ↗Advisors Asset Management, Inc. ↗

Recent Congressional disclosures

No matching Congressional transactions were returned in this source preview.

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No records are available for this view.

Bounded public source preview, up to 25 disclosed events.

How to read the disclosure dates

The tables report different things: insider transactions, institutional positions and Congressional transaction ranges. Read each table with its source dates and units. They cannot be added into a combined ownership percentage.

  1. Company insiders

    SEC Form 4 purchases, sales and awards report transactions and their public filing availability.

  2. Institutional managers

    13F reports disclose delayed quarter-end positions. They are not a record of trades between quarters.

  3. Congressional filers

    Periodic transaction reports disclose transaction dates and amount brackets. Public filing dates determine what researchers could know.

Institutional source directory ↗Congressional source directory ↗

Read the transaction codes

Awards use transaction code A, purchases P and sales S. An acquisition from an award is not the same as an open-market purchase. Joint filers may share a transaction. Use original receipts and availability dates to interpret the events.

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