Westlake Corporation (WLK)
NYSE: WLK · Industrial Organic Chemicals · Houston, TX · filing with the SEC since 2003
Grade5.3
◀ Past 6.7● Present 5.4▶ Future 4.0
Filings
248 filings since 2017 beside 587 insider forms · Large accelerated filer · read from EDGAR on Nov 13, 2026Due nextLarge accelerated filer
10-K
Annual report for the fiscal year ending Dec 31, 2026Large accelerated filers have 60 days after the fiscal year ends.
by Mar 1, 2027
10-Q
Quarterly report for the quarter ending Mar 31, 2027Large accelerated filers have 40 days after the quarter ends; quarter ends are taken to the month end.
by May 10, 2027
A deadline is the latest date the SEC's rules allow for its filer category. It is not a forecast of the day the company files. Last time, the results release (8-K item 2.02) came 35 days after the quarter ended. The proxy statement was last filed Apr 2, 2026.
Filings a yearinsider forms included
71768482101916580
2026 counts to Nov 13, 2026.
Officer or director change (8-K item 5.02): 11 times in the last 36 months, the newest Aug 31, 2026.SEC letters: 3 in the last 36 months, the newest Sep 6, 2024.
Insider forms (3, 4, 5 and 144) are counted each year but not listed here; the people and their trades are on the Ownership tab.
FiledFormWhat it is, in plain wordsPeriodAsk
Nov 4, 2026
8-K items 2.02, 7.01, 9.01
Results released; Investor disclosure (Regulation FD) · Current report
Sep 29, 2026
8-K items 2.05, 7.01
Exit or restructuring costs; Investor disclosure (Regulation FD) · Current report
Sep 24, 2026
Aug 4, 2026
8-K items 2.02, 7.01, 9.01
Results released; Investor disclosure (Regulation FD) · Current report
May 5, 2026
8-K items 2.02, 7.01, 9.01
Results released; Investor disclosure (Regulation FD) · Current report
Apr 20, 2026
8-K items 5.02, 7.01, 9.01
Officer or director change; Investor disclosure (Regulation FD) · Current report
Apr 15, 2026
Apr 6, 2026
8-K items 1.01, 1.02, 2.03, 9.01
Major agreement signed; Major agreement ended; New debt or obligation taken on · Current report
Apr 2, 2026
Feb 24, 2026
8-K items 2.02, 7.01, 9.01
Results released; Investor disclosure (Regulation FD) · Current report
Feb 23, 2026
8-K items 5.02, 7.01, 9.01
Officer or director change; Investor disclosure (Regulation FD) · Current report
Feb 19, 2026
Dec 15, 2025
8-K items 2.05, 7.01, 9.01
Exit or restructuring costs; Investor disclosure (Regulation FD) · Current report
Dec 12, 2025
Nov 5, 2025
8-K items 1.01, 7.01, 9.01
Major agreement signed; Investor disclosure (Regulation FD) · Current report
Nov 4, 2025
Oct 30, 2025
8-K items 2.02, 7.01, 9.01
Results released; Investor disclosure (Regulation FD) · Current report
Aug 5, 2025
8-K items 2.02, 7.01, 9.01
Results released; Investor disclosure (Regulation FD) · Current report
40 of 248 shown
Every row opens the filing on EDGAR. The plain words are the site's own for each form and each 8-K item; the complete history, insider forms included, is on EDGAR.