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Westlake Corp. SEC filings

In the twelve months since 9 October 2025 Westlake Corp. filed 29 documents with the SEC of the kinds listed here: 20 current reports (8-K), about 14 regulation fd disclosure; 4 officer or director change; 4 results of operations; 2 exit or disposal costs; 2 other events; 3 quarterly reports (10-Q), 1 conflict minerals report (SD), 1 annual report to shareholders (ARS), 1 additional proxy material (DEFA14A), 1 proxy statement (DEF 14A), 1 annual report (10-K). The latest, filed 29 September 2026: 8-K, exit or disposal costs, regulation fd disclosure.

FiledFormWhat it was aboutPeriod or event dateFiling
29 September 20268-KExit or disposal costs, Regulation FD disclosure24 September 2026EDGAR
31 August 20268-KOfficer or director change31 August 2026EDGAR
5 August 202610-Qquarterly report30 June 2026EDGAR
4 August 20268-KResults of operations, Regulation FD disclosure4 August 2026EDGAR
29 July 20268-KOther events29 July 2026EDGAR
15 June 20268-KRegulation FD disclosure15 June 2026EDGAR
18 May 2026SDconflict minerals reportEDGAR
18 May 20268-KShareholder vote14 May 2026EDGAR
6 May 202610-Qquarterly report31 March 2026EDGAR
5 May 20268-KResults of operations, Regulation FD disclosure5 May 2026EDGAR
1 May 20268-KRegulation FD disclosure27 April 2026EDGAR
20 April 20268-KOfficer or director change, Regulation FD disclosure15 April 2026EDGAR
14 April 20268-KOther events13 April 2026EDGAR
6 April 20268-KMaterial agreement, Termination of a material agreement, New financial obligation2 April 2026EDGAR
2 April 20268-KOfficer or director change30 March 2026EDGAR
2 April 2026ARSannual report to shareholders31 December 2025EDGAR
2 April 2026DEFA14Aadditional proxy materialEDGAR
2 April 2026DEF 14Aproxy statement14 May 2026EDGAR
26 February 202610-Kannual report31 December 2025EDGAR
24 February 20268-KResults of operations, Regulation FD disclosure24 February 2026EDGAR
23 February 20268-KOfficer or director change, Regulation FD disclosure19 February 2026EDGAR
6 January 20268-KRegulation FD disclosure6 January 2026EDGAR
15 December 20258-KExit or disposal costs, Regulation FD disclosure12 December 2025EDGAR
12 November 20258-KRegulation FD disclosure10 November 2025EDGAR
5 November 20258-KMaterial agreement, Regulation FD disclosure4 November 2025EDGAR
4 November 20258-KRegulation FD disclosure4 November 2025EDGAR
31 October 202510-Qquarterly report30 September 2025EDGAR
31 October 2025S-3ASRshelf registrationEDGAR
30 October 20258-KResults of operations, Regulation FD disclosure30 October 2025EDGAR
An 8-K is what a company files within four business days of a material event; the SEC numbers the events, and the words here are the SEC's own headings, shortened.
Read moreForm 4, Form 144, 13F and Schedule 13D and 13G have their own pages. Prospectus supplements and correspondence are not listed.

Source

The company's filing index on EDGAR, read from the SEC's submissions feed.

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