| Form type | Sec Links | Description | Filing date | Reporting date |
|---|---|---|---|---|
| SC 13G/A | Report | SC 13G/A | Feb 14, 2024 | |
| SC 13G/A | Report | SEC SCHEDULE 13G | Feb 12, 2024 | |
| SC 13G/A | Report | AMENDED SCHEDULE 13G | Feb 7, 2024 | |
| SC 13G/A | Report | SC 13G/A | Feb 14, 2023 | |
| SC 13G/A | Report | SEC SCHEDULE 13G | Feb 10, 2023 | |
| SC 13G/A | Report | NONE | Jan 23, 2023 | |
| SC 13G/A | Report | AMENDED SCHEDULE 13G | Jan 11, 2023 | |
| SC 13G/A | Report | SC 13G/A | Feb 14, 2022 | |
| SC 13G/A | Report | SEC SCHEDULE 13G | Feb 11, 2022 | |
| SC 13G/A | Report | AMENDED SCHEDULE 13G | Jan 28, 2022 | |
| SC 13G/A | Report | NONE | Jan 21, 2022 | |
| SC 13G/A | Report | SCHEDULE 13G/A | Feb 16, 2021 | |
| SC 13G/A | Report | SCHEDULE 13G/A | Feb 16, 2021 | |
| SC 13G/A | Report | SEC SCHEDULE 13G | Feb 12, 2021 | |
| SC 13G/A | Report | JANUS HENDERSON GROUP PLC OWNS 3.3% | Feb 11, 2021 | |
| SC 13G/A | Report | NONE | Jan 15, 2021 | |
| SC 13G | Report | SCHEDULE 13G | Jan 11, 2021 | |
| SC 13G | Report | SCHEDULE 13G | Feb 14, 2020 | |
| SC 13G/A | Report | JANUS HENDERSON GROUP PLC OWNS 5.4% OF WESTLAKE | Feb 14, 2020 | |
| SC 13G/A | Report | SEC SCHEDULE 13G | Feb 12, 2020 | |
| SC 13G/A | Report | NONE | Jan 27, 2020 | |
| SC 13G | Report | SEC SCHEDULE 13G | Jun 10, 2019 | |
| SC 13G/A | Report | AMENDMENT NO.1 TO SCHEDULE 13G | Feb 14, 2019 | |
| SC 13G | Report | JANUS HENDERSON GROUP PLC OWNS 5.5% OF WESTLAKE | Feb 13, 2019 | |
| SC 13G/A | Report | Feb 11, 2019 | ||
| SC 13G | Report | Feb 6, 2019 | ||
| SC 13G/A | Report | Jan 10, 2019 | ||
| SC 13G | Report | SC 13G | Apr 3, 2018 | |
| SC 13G/A | Report | SC 13G/A | Feb 14, 2018 | |
| SC 13G/A | Report | Feb 14, 2018 | ||
| SC 13G/A | Report | FORM SC 13G | Feb 5, 2018 | |
| SC 13G/A | Report | SC 13G/A | Jan 26, 2018 | |
| SC 13G/A | Report | FORM SC 13G | Oct 6, 2017 | |
| SC 13G/A | Report | SC 13G/A | Apr 24, 2017 | |
| SC 13G | Report | SC 13G/A | Feb 14, 2017 | |
| SC 13G/A | Report | SC 13G AMENDMENT NO. 2 | Feb 13, 2017 | |
| SC 13G/A | Report | SC 13G/A | Feb 10, 2017 | |
| SC 13G/A | Report | SCHEDULE 13G | Jan 25, 2017 | |
| SC 13G/A | Report | SCHEDULE 13G/A | Feb 16, 2016 | |
| SC 13G/A | Report | NONE | Feb 16, 2016 | |
| SC 13G/A | Report | SC 13G AMENDMENT NO. 1 | Feb 12, 2016 | |
| SC 13G/A | Report | Feb 9, 2016 | ||
| SC 13G/A | Report | SCHEDULE 13G | Feb 9, 2016 | |
| SC 13G/A | Report | SCHEDULE 13G/A | Feb 5, 2016 | |
| SC 13G | Report | SCHEDULE 13G | Jan 7, 2016 | |
| SC 13G | Report | SCHEDULE 13G | May 21, 2015 | |
| SC 13G | Report | NONE | Feb 17, 2015 | |
| SC 13G | Report | SC 13G | Feb 13, 2015 | |
| SC 13G | Report | Feb 13, 2015 | ||
| SC 13G | Report | SCHEDULE 13G | Aug 11, 2014 |