# Westlake Corp: filings

WLK · NYSE · CIK 1262823 · [Materials](/sectors/materials.md) · fiscal year ends Dec 31

Pages: [Overview](/companies/wlk.md) · [Financials](/companies/wlk/financials.md) · [Filings](/companies/wlk/filings.md) · [Insiders](/companies/wlk/insiders.md)

## Reports and events: 291 filings

Newest first, by EDGAR acceptance time (Eastern). Filter with ?form= one of: `periodic`, `8-K`, `10-K`, `10-Q`, `4`, `proxy`, `13dg`, `all`, or any form this company filed (4 867, 8-K 199, 10-Q 53, 4/A 33, 3 29, 144 28, SC 13G/A 27, 425 20, 10-K 18, DEF 14A 18, 424B5 13, DEFA14A 13, SD 13, UPLOAD 12, ARS 11, CORRESP 11, DFAN14A 10, FWP 6, S-3ASR 6, SC TO-C 6, PRE 14A 4, SC 13G 4, 8-K/A 3, 3/A 2, 8-A12B 2, CERT 2, DFRN14A 2, POSASR 2, PX14A6G 2, DEFC14A 1, EFFECT 1, PREC14A 1, PRRN14A 1, S-4 1, S-8 1).

| Filed | Accepted | Form | What it is | Accession |
| --- | --- | --- | --- | --- |
| 2026-09-29 | 02:06 ET | [8-K](/filings/0001262823-26-000067.md) | 2.05 Exit or disposal costs; 7.01 Regulation FD disclosure | 0001262823-26-000067 |
| 2026-08-31 | 17:00 ET | [8-K](/filings/0001193125-26-376996.md) | 5.02 Departure or appointment of officers or directors | 0001193125-26-376996 |
| 2026-08-05 | 14:27 ET | [10-Q](/filings/0001262823-26-000032.md) | Quarterly report, period 2026-06-30 | 0001262823-26-000032 |
| 2026-08-04 | 07:27 ET | [8-K](/filings/0001262823-26-000026.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001262823-26-000026 |
| 2026-07-29 | 16:45 ET | [8-K](/filings/0001193125-26-324110.md) | 8.01 Other events | 0001193125-26-324110 |
| 2026-06-15 | 16:45 ET | [8-K](/filings/0001193125-26-271206.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-26-271206 |
| 2026-05-18 | 17:00 ET | [8-K](/filings/0001193125-26-229093.md) | 5.07 Shareholder vote results | 0001193125-26-229093 |
| 2026-05-06 | 13:49 ET | [10-Q](/filings/0001262823-26-000022.md) | Quarterly report, period 2026-03-31 | 0001262823-26-000022 |
| 2026-05-05 | 07:30 ET | [8-K](/filings/0001262823-26-000019.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001262823-26-000019 |
| 2026-05-01 | 07:08 ET | [8-K](/filings/0001193125-26-199067.md) | 7.01 Regulation FD disclosure | 0001193125-26-199067 |
| 2026-04-20 | 17:05 ET | [8-K](/filings/0001193125-26-164225.md) | 5.02 Departure or appointment of officers or directors; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-26-164225 |
| 2026-04-14 | 06:01 ET | [8-K](/filings/0001193125-26-153703.md) | 8.01 Other events | 0001193125-26-153703 |
| 2026-04-06 | 06:02 ET | [8-K](/filings/0001193125-26-142822.md) | 1.01 Entry into a material agreement; 1.02 Termination of a material agreement; 2.03 New direct financial obligation; 9.01 Financial statements and exhibits | 0001193125-26-142822 |
| 2026-04-02 | 08:01 ET | [8-K](/filings/0001193125-26-139007.md) | 5.02 Departure or appointment of officers or directors | 0001193125-26-139007 |
| 2026-04-02 | 07:30 ET | [DEF 14A](/filings/0001193125-26-138974.md) | Proxy statement, period 2026-05-14 | 0001193125-26-138974 |
| 2026-02-26 | 13:39 ET | [10-K](/filings/0001262823-26-000016.md) | Annual report, period 2025-12-31 | 0001262823-26-000016 |
| 2026-02-24 | 07:22 ET | [8-K](/filings/0001262823-26-000008.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001262823-26-000008 |
| 2026-02-23 | 16:55 ET | [8-K](/filings/0001193125-26-064221.md) | 5.02 Departure or appointment of officers or directors; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-26-064221 |
| 2026-01-06 | 16:54 ET | [8-K](/filings/0001262823-26-000005.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001262823-26-000005 |
| 2025-12-15 | 07:30 ET | [8-K](/filings/0001193125-25-318445.md) | 2.05 Exit or disposal costs; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-25-318445 |
| 2025-11-12 | 06:30 ET | [8-K](/filings/0001193125-25-275790.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-25-275790 |
| 2025-11-05 | 17:03 ET | [8-K](/filings/0001193125-25-267207.md) | 1.01 Entry into a material agreement; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-25-267207 |
| 2025-11-04 | 09:51 ET | [8-K](/filings/0001193125-25-263753.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-25-263753 |
| 2025-10-31 | 15:02 ET | [10-Q](/filings/0001262823-25-000064.md) | Quarterly report, period 2025-09-30 | 0001262823-25-000064 |
| 2025-10-30 | 07:33 ET | [8-K](/filings/0001262823-25-000061.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001262823-25-000061 |
| 2025-08-26 | 16:46 ET | [8-K](/filings/0001262823-25-000056.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001262823-25-000056 |
| 2025-08-06 | 17:01 ET | [10-Q](/filings/0001262823-25-000052.md) | Quarterly report, period 2025-06-30 | 0001262823-25-000052 |
| 2025-08-05 | 07:25 ET | [8-K](/filings/0001262823-25-000047.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001262823-25-000047 |
| 2025-06-17 | 06:01 ET | [8-K](/filings/0001262823-25-000043.md) | 2.05 Exit or disposal costs | 0001262823-25-000043 |
| 2025-05-12 | 16:45 ET | [8-K](/filings/0001262823-25-000033.md) | 5.07 Shareholder vote results | 0001262823-25-000033 |
| 2025-05-02 | 15:18 ET | [10-Q](/filings/0001262823-25-000029.md) | Quarterly report, period 2025-03-31 | 0001262823-25-000029 |
| 2025-05-02 | 07:25 ET | [8-K](/filings/0001262823-25-000026.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001262823-25-000026 |
| 2025-04-16 | 18:00 ET | [8-K](/filings/0001262823-25-000020.md) | 5.02 Departure or appointment of officers or directors | 0001262823-25-000020 |
| 2025-03-28 | 08:23 ET | [DEF 14A](/filings/0001193125-25-066316.md) | Proxy statement, period 2025-05-08 | 0001193125-25-066316 |
| 2025-03-04 | 17:00 ET | [8-K](/filings/0001262823-25-000015.md) | 5.02 Departure or appointment of officers or directors | 0001262823-25-000015 |
| 2025-02-25 | 16:16 ET | [10-K](/filings/0001262823-25-000011.md) | Annual report, period 2024-12-31 | 0001262823-25-000011 |
| 2025-02-24 | 07:28 ET | [8-K](/filings/0001262823-25-000005.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001262823-25-000005 |
| 2024-12-11 | 19:17 ET | [8-K](/filings/0001193125-24-274528.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0001193125-24-274528 |
| 2024-11-06 | 10:49 ET | [10-Q](/filings/0001262823-24-000053.md) | Quarterly report, period 2024-09-30 | 0001262823-24-000053 |
| 2024-11-05 | 07:26 ET | [8-K](/filings/0001262823-24-000050.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001262823-24-000050 |
| 2024-08-12 | 06:07 ET | [8-K](/filings/0001193125-24-198308.md) | 5.02 Departure or appointment of officers or directors | 0001193125-24-198308 |
| 2024-08-09 | 12:30 ET | [10-Q](/filings/0001262823-24-000045.md) | Quarterly report, period 2024-06-30 | 0001262823-24-000045 |
| 2024-08-06 | 07:25 ET | [8-K](/filings/0001262823-24-000041.md) | 2.02 Results of operations; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001262823-24-000041 |
| 2024-07-29 | 06:04 ET | [8-K](/filings/0001193125-24-186619.md) | 2.05 Exit or disposal costs | 0001193125-24-186619 |
| 2024-07-15 | 08:32 ET | [8-K](/filings/0001193125-24-178846.md) | 5.02 Departure or appointment of officers or directors; 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001193125-24-178846 |
| 2024-07-01 | 06:05 ET | [8-K](/filings/0001193125-24-172673.md) | 7.01 Regulation FD disclosure | 0001193125-24-172673 |
| 2024-06-13 | 08:55 ET | [8-K](/filings/0001262823-24-000033.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001262823-24-000033 |
| 2024-05-29 | 16:33 ET | [8-K](/filings/0001193125-24-149225.md) | 5.02 Departure or appointment of officers or directors | 0001193125-24-149225 |
| 2024-05-13 | 16:31 ET | [8-K](/filings/0001193125-24-137266.md) | 5.07 Shareholder vote results | 0001193125-24-137266 |
| 2024-05-02 | 13:28 ET | [10-Q](/filings/0001262823-24-000025.md) | Quarterly report, period 2024-03-31 | 0001262823-24-000025 |

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Source: SEC EDGAR, the company’s filing index. Last ingested by Listed: Oct 24, 2026, 15:10 ET. No prices; not investment advice.