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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 2026-11-10T07:40:50.020Z

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

First displayed source row from Recent Form 4 activity. 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 0001193125-26-377500 ↗SEC 0001193125-26-353632 ↗SEC 0001193125-26-353631 ↗

Recent Form 4 activity

Inspect all 11 displayed rows: 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

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

Recent institutional filing receipts

Inspect all 50 displayed rows: 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.

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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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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.