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WESTLAKE CORP — All Filings

1,007 total filings on record

Public companies registered with the SEC are required to file periodic reports, disclosures, and notices throughout the year. The most important are the 10-K (annual report), 10-Q (quarterly report), and 8-K (material event notice). Use the filters below to narrow by form type.

Overview All Filings Financials Insiders
All 10-K 10-Q 144 3 3/A 4 4/A 424B4 424B5 425 8-A12B 8-K 8-K/A ARS CERT CORRESP DEF 14A DEFA14A DEFC14A DFAN14A DFRN14A EFFECT FWP POS AM POSASR PRE 14A PREC14A PRRN14A PX14A6G S-1 S-1/A S-3 S-3/A S-3ASR S-4 S-4/A S-8 SC 13G SC 13G/A SC TO-C SD UPLOAD
Form Description Accession Number Filed Period
144 0001950047-26-003039 Mar 27, 2026
4/A 4/A 0001193125-26-096289 Mar 6, 2026 Feb 16, 2022
4 4 0001193125-26-084672 Mar 2, 2026 Feb 27, 2026
144 0001950047-26-001885 Feb 27, 2026
10-K 10-K 0001262823-26-000016 Feb 26, 2026 Dec 31, 2025
8-K 8-K 0001262823-26-000008 Feb 24, 2026
4 4 0001193125-26-065177 Feb 24, 2026 Feb 20, 2026
3 3 0001193125-26-064648 Feb 23, 2026 Feb 20, 2026
8-K 8-K 0001193125-26-064221 Feb 23, 2026 Feb 19, 2026
4 4 0001193125-26-063707 Feb 23, 2026 Feb 19, 2026
4 4 0001193125-26-063705 Feb 23, 2026 Feb 19, 2026
4 4 0001193125-26-063701 Feb 23, 2026 Feb 20, 2026
4 4 0001193125-26-063700 Feb 23, 2026 Feb 19, 2026
4 4 0001193125-26-063688 Feb 23, 2026 Feb 19, 2026
4 4 0001193125-26-063686 Feb 23, 2026 Feb 19, 2026
4 4 0001193125-26-063669 Feb 23, 2026 Feb 19, 2026
4 4 0001193125-26-063663 Feb 23, 2026 Feb 19, 2026
4 4 0001193125-26-063659 Feb 23, 2026 Feb 19, 2026
4 4 0001193125-26-059219 Feb 19, 2026 Feb 17, 2026
4 4 0001193125-26-059217 Feb 19, 2026 Feb 17, 2026
4 4 0001193125-26-059215 Feb 19, 2026 Feb 17, 2026
4 4 0001193125-26-059213 Feb 19, 2026 Feb 17, 2026
4 4 0001193125-26-059212 Feb 19, 2026 Feb 17, 2026
4 4 0001193125-26-059211 Feb 19, 2026 Feb 17, 2026
4 4 0001193125-26-059210 Feb 19, 2026 Feb 17, 2026
4 4 0001193125-26-059207 Feb 19, 2026 Feb 17, 2026
8-K 8-K 0001262823-26-000005 Jan 6, 2026
4 4 0001193125-25-329926 Dec 23, 2025 Dec 22, 2025
144 0001950047-25-010631 Dec 22, 2025
8-K 8-K 0001193125-25-318445 Dec 15, 2025 Dec 12, 2025
4 4 0001193125-25-314045 Dec 10, 2025
8-K 8-K 0001193125-25-275790 Nov 12, 2025 Nov 10, 2025
8-K 8-K 0001193125-25-267207 Nov 5, 2025 Nov 4, 2025
424B5 424B5 0001193125-25-267197 Nov 5, 2025
FWP FWP 0001193125-25-264936 Nov 4, 2025
8-K 8-K 0001193125-25-263753 Nov 4, 2025
424B5 424B5 0001193125-25-263703 Nov 4, 2025
S-3ASR S-3ASR 0001193125-25-260927 Oct 31, 2025
10-Q 10-Q 0001262823-25-000064 Oct 31, 2025 Sep 30, 2025
8-K 8-K 0001262823-25-000061 Oct 30, 2025
4 4 0001193125-25-229590 Oct 3, 2025 Oct 1, 2025
4 4 0001299505-25-000007 Aug 29, 2025 Aug 28, 2025
8-K 8-K 0001262823-25-000056 Aug 26, 2025
4 4 0001457009-25-000004 Aug 11, 2025 Aug 8, 2025
4 4 0001974884-25-000004 Aug 11, 2025 Aug 8, 2025
4 4 0001726418-25-000004 Aug 11, 2025 Aug 8, 2025
4 4 0001307964-25-000004 Aug 11, 2025 Aug 8, 2025
4 4 0001974878-25-000004 Aug 11, 2025 Aug 8, 2025
4 4 0001215888-25-000005 Aug 11, 2025 Aug 8, 2025
4 4 0001448219-25-000004 Aug 11, 2025 Aug 8, 2025