WLK · NYSE · CIK 0001262823

WESTLAKE CORP

WESTLAKE CORP’s most recent SEC filing in our snapshot is a Form 8-K filed on Sep 29, 2026. In fiscal 2025 (year ended Dec 31, 2025) it reported revenue of $11.2B and net income of -$1.5B, according to its XBRL data on EDGAR. Its EDGAR record lists 47 Form 4 insider filings from the 12 months before our last refresh.

SEC EDGAR snapshot updated Oct 27, 2026, 11:27 PM EDT. See all filings on sec.gov.

Revenue, FY2025
$11.2B
Net income, FY2025
-$1.5B
Form 4 filings on record, past 12 months
47

Company overview

Legal name (as filed)
WESTLAKE CORP
Ticker
WLK
SEC Central Index Key (CIK)
0001262823
Industry (SIC)
Industrial Organic Chemicals (code 2860)
Business address
HOUSTON, TX
State or country of incorporation
DE
Fiscal year ends
December 31
SEC filer category
Large accelerated filer
Position in SEC ticker list
#1029 of the 3,000 companies we track

Five-year financial highlights

Full-year figures from WESTLAKE CORP’s annual reports, as tagged in XBRL and published by the SEC. Amounts are in U.S. dollars; the fiscal year is named for the calendar year in which it ends.

Revenue
$11.8BFY2021$15.8BFY2022$12.5BFY2023$12.1BFY2024$11.2BFY2025
Net income
$2.0BFY2021$2.2BFY2022$479.0MFY2023$602.0MFY2024-$1.5BFY2025
WLK annual results
ItemFY2021
ended Dec 31, 2021		FY2022
ended Dec 31, 2022		FY2023
ended Dec 31, 2023		FY2024
ended Dec 31, 2024		FY2025
ended Dec 31, 2025
Revenue$11.8B$15.8B$12.5B$12.1B$11.2B
Net income$2.0B$2.2B$479.0M$602.0M-$1.5B
Diluted EPS$15.58$17.34$3.70$4.64-$11.70
Total assets$18.5B$20.6B$21.0B$20.8B$20.0B
Cash and equivalents$1.9B$2.2B$3.3B$2.9B$2.7B

XBRL tags used: revenue = Revenues; netIncome = NetIncomeLoss; assets = Assets; eps = EarningsPerShareDiluted; cash = CashAndCashEquivalentsAtCarryingValue. EPS is shown as originally reported for each year and may not be adjusted for later stock splits. A dash means the company did not report that item in a form we could match.

How to read these numbers

Revenue is the money a company brings in from selling its products and services; net income is what is left after all expenses, interest and taxes. Diluted EPS spreads net income across every share that could exist if options and convertible securities were exercised. Total assets and cash are balance-sheet figures measured on the last day of the fiscal year. For the full story — segment results, one-time charges, guidance — read Management’s Discussion and Analysis in the Form 10-K.

Latest key reports

The most recent filing of each major report type, even if it falls outside the 40 newest filings below.

WLK latest annual, quarterly, current and proxy reports
FiledFormWhat it isOriginal
Feb 26, 202610-KAnnual report· period Dec 31, 2025Document · Index
Aug 5, 202610-QQuarterly report· period Jun 30, 2026Document · Index
Sep 29, 20268-KExit or disposal costs; Regulation FD disclosure· period Sep 24, 2026Document · Index
Apr 2, 2026DEF 14ADefinitive proxy statement· period May 14, 2026Document · Index

Recent SEC filings

The 40 newest documents filed by or about WESTLAKE CORP, by form type:

4 ×238-K ×93 ×210-Q ×2144 ×18-A12B ×1CERT ×1SD ×1
WLK recent filings
FiledFormWhat it isOriginal
Sep 29, 20268-KExit or disposal costs; Regulation FD disclosure· period Sep 24, 2026Document · Index
Sep 1, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 31, 2026Document · Index
Aug 31, 20263Initial statement of beneficial ownership· period Aug 31, 2026Document · Index
Aug 31, 20268-KDirector or officer change· period Aug 31, 2026Document · Index
Aug 21, 20268-A12B8-A12BDocument · Index
Aug 21, 2026CERTNYSE TEXAS CERTIFICATIONDocument · Index
Aug 17, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 14, 2026Document · Index
Aug 17, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 14, 2026Document · Index
Aug 17, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 14, 2026Document · Index
Aug 17, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 14, 2026Document · Index
Aug 17, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 14, 2026Document · Index
Aug 17, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 14, 2026Document · Index
Aug 17, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 14, 2026Document · Index
Aug 17, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 14, 2026Document · Index
Aug 17, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 14, 2026Document · Index
Aug 17, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 14, 2026Document · Index
Aug 11, 2026144Notice of proposed sale of securitiesDocument · Index
Aug 11, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 11, 2026Document · Index
Aug 10, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 8, 2026Document · Index
Aug 10, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 8, 2026Document · Index
Aug 10, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 8, 2026Document · Index
Aug 10, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 8, 2026Document · Index
Aug 10, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 8, 2026Document · Index
Aug 10, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 8, 2026Document · Index
Aug 10, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 8, 2026Document · Index
Aug 10, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 8, 2026Document · Index
Aug 10, 20264Statement of changes in beneficial ownership (insider trade)· period Aug 8, 2026Document · Index
Aug 5, 202610-QQuarterly report· period Jun 30, 2026Document · Index
Aug 4, 20268-KResults of operations; Regulation FD disclosure· period Aug 4, 2026Document · Index
Jul 29, 20268-KOther events· period Jul 29, 2026Document · Index
Jun 16, 20264Statement of changes in beneficial ownership (insider trade)· period Jun 15, 2026Document · Index
Jun 15, 20268-KRegulation FD disclosure· period Jun 15, 2026Document · Index
Jun 15, 20263Initial statement of beneficial ownership· period Jun 15, 2026Document · Index
May 18, 2026SDSpecialized disclosure report (conflict minerals)Document · Index
May 18, 20268-KShareholder vote results· period May 14, 2026Document · Index
May 14, 20264Statement of changes in beneficial ownership (insider trade)· period May 12, 2026Document · Index
May 6, 202610-QQuarterly report· period Mar 31, 2026Document · Index
May 5, 20268-KResults of operations; Regulation FD disclosure· period May 5, 2026Document · Index
May 1, 20268-KRegulation FD disclosure· period Apr 27, 2026Document · Index
Apr 20, 20268-KDirector or officer change; Regulation FD disclosure· period Apr 15, 2026Document · Index

Insider filing activity

47 Form 4 filings appear in WESTLAKE CORP’s EDGAR record between Oct 28, 2025 and our last refresh. Most are reports by the company’s own directors, officers and 10% owners, but EDGAR also lists a Form 4 under a company when the company itself is the insider — for example, when it owns more than 10% of another public company. Foreign private issuers’ own insiders generally do not file Form 4. A high count is not by itself a signal: many Form 4s report routine stock awards, tax withholding or sales under pre-arranged Rule 10b5-1 plans. Open each filing to see the transaction code, share count and price. What a Form 4 shows.

Other companies in Industrial Organic Chemicals

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Source

  • U.S. Securities and Exchange Commission, EDGAR submissions for CIK 0001262823 and XBRL company facts. WESTLAKE CORP on EDGAR.
  • Snapshot updated Oct 27, 2026, 11:27 PM EDT. The SEC does not endorse OpenFilings. Company names and tickers are used only to identify the filer; no logos are shown.

Not investment advice. This page summarizes public SEC filings for information only. Figures may contain errors or omissions; confirm everything in the original filing before relying on it.