Westlake Corporation (WLK)
Building products and chemicals, counted by segment. Read October 19, 2026 from the annual report for the period ending December 31, 2025, filed February 26, 2026. Ranked 22 of the 43 Basic Materials companies read so far, by the share within reach now.
Within reach now
19%
End of 2028
33%
Employees, annual report
14,600
Leading staffing pattern
Plastics Product Manufacturing
Share of the working time within reach, long-run pace, four times in five
- Now19%
- End of 202729%
- End of 202833%
- End of 203034%
What changes for its people by the end of 2028, by its industries' figures
- Stays with people 66%
- Becomes checking a model's work 28%
- Handed over with lighter checks 5%
The filing counts 14,600 employees by segment, 7,400 in building products, 6,500 in chemicals and 700 corporate, 68% in the United States, so every pattern is a counted part.
The figures on this page come from the company's own annual report and from BLS staffing patterns for its industries, never from a roster. They are estimates with a stated method. Nothing here says what the company will do: within reach is not a forecast of jobs lost or of savings.
What follows from the reading
Share of working time within reach of AI, on the long-run pace at four in five: 19% now, 29% at the end of 2027, 33% at the end of 2028, 34% at the end of 2030. By the patterns, the work is about 34% desk work, 13% people work and 53% body work. These are the site's industry estimates weighted by the shares below: estimates with a stated method and range, not a forecast of what the company will do. By the same patterns, at the end of 2028 about 66% of the working time stays with people (conversation, in-person and hands-on work), 28% becomes checking a model's work and 5% could be handed over with lighter checks, from the industries' own figures, not the company's roles.
Headcount
14,600 employees as of December 31, 2025 (stated). Approximately 68% of employees in the United States, stated; 18 countries in all.
The filing: “As of December 31, 2025, we had approximately 14,600 employees in the following areas: Housing and Infrastructure Products segment 7,400, Performance and Essential Materials segment 6,500, Corporate and other 700.”
The workforce as industry patterns
| Pattern | Share | Reason, from the filing |
|---|---|---|
| Plastics Product Manufacturing | 51% | The filing counts 7,400 employees in the Housing and Infrastructure Products segment (a), the PVC pipe, siding, windows and compounds plants, read at plastics product manufacturing. |
| Chemical Manufacturing (3251, 3252, 3253, and 3259 only) | 44% | The filing counts 6,500 employees in the Performance and Essential Materials segment (a), the chlor-alkali, polyethylene, PVC resin and epoxy plants, read at the chemicals group (3251 and 3252, in 3250A1). |
| Management of Companies and Enterprises | 5% | The filing counts 700 employees in Corporate and other (a), a stated corporate count read at management of companies under rule 6 and kept under rule 5 because it is counted. |
What the filing says about the workforce: 7,400 Housing and Infrastructure Products, 6,500 Performance and Essential Materials, 700 corporate and other; about 68% in the United States; about 24% represented by unions including works councils in Europe, agreements expiring through 2029.
Companies read with the same leading pattern
Other companies whose largest staffing pattern is also Plastics Product Manufacturing, largest first, each read from its own annual report. Within reach now and at the end of 2028, long-run pace, four in five.
- Amcor plc (AMCR, 75,000 employees)17% now, 26% by 2028
- AptarGroup, Inc. (ATR, 14,000 employees)17% now, 26% by 2028
- Quanex Building Products Corporation (NX, 7,071 employees)18% now, 28% by 2028
What the filing says about AI
0 sentences in the filing name AI. The filing names artificial intelligence in no sentence.
Its annual reports, year by year
Sentences naming AI in each annual report, counted by one rule, beside the median report in the Index that year. Each count links its filing. Every company, by year and sector
- Fiscal 20210median 0
- Fiscal 20220median 0
- Fiscal 20230median 1
- Fiscal 20241median 4
- Fiscal 20250median 10
Headcount by filing year
As reported in each year's annual report, with the filing. A year marked not read had no figure the reading could take from the report's text.
| Period | Employees | Filed | Filing |
|---|---|---|---|
| 2025-12-31 | 14,600 | 2026-02-26 | 10-K |
| 2024-12-31 | 15,540 | 2025-02-25 | 10-K |
| 2023-12-31 | 15,520 | 2024-02-22 | 10-K |
| 2022-12-31 | 15,920 | 2023-02-22 | 10-K |
| 2021-12-31 | 14,550 | 2022-02-23 | 10-K |
| 2020-12-31 | 9,220 | 2021-02-24 | 10-K |
| 2019-12-31 | 9,430 | 2020-02-19 | 10-K |
| 2018-12-31 | 8,870 | 2019-02-20 | 10-K |
| 2017-12-31 | 8,800 | 2018-02-21 | 10-K |
| 2016-12-31 | 8,870 | 2017-02-22 | 10-K |
| 2015-12-31 | 4,225 | 2016-02-24 | 10-K |
| 2014-12-31 | 3,550 | 2015-02-25 | 10-K |
| 2013-12-31 | 2,200 | 2014-02-21 | 10-K |
| 2012-12-31 | 1,895 | 2013-02-22 | 10-K |
| 2011-12-31 | 1,811 | 2012-02-23 | 10-K |
| 2010-12-31 | 1,873 | 2011-02-24 | 10-K |
| 2009-12-31 | 1,827 | 2010-02-24 | 10-K |
| 2008-12-31 | 1,961 | 2009-02-19 | 10-K |
| 2007-12-31 | 2,120 | 2008-02-20 | 10-K |
| 2006-12-31 | 2,056 | 2007-02-26 | 10-K |
| 2005-12-31 | 1,856 | 2006-02-23 | 10-K |
| 2004-12-31 | 1,866 | 2005-03-16 | 10-K |
| 2003-12-31 | 1,635 | 2004-03-26 | 10-K |
Limits of this reading
- The corporate and other count (700) is read at management of companies under rule 6.
Source: the company's annual report on EDGAR, accession 0001262823-26-000016, the filing. Read by Claude Fable 5.1 under rubric version 1, by the method. A company can write to info@stratussc.com to have its reading checked against its filing.
The report on Westlake Corporation, $29
This page as a document to keep, with what it does not show: the share within reach at every date on three paces and two reliabilities, a typical workforce of this shape at the stated headcount role by role and task by task (the industries' staffing, never the company's roster), where to start, what changes for the people and what they would learn, every sentence in the filing that names AI, the headcount by year, the companies read with the same leading pattern, the method and a citation line. To print or save as a PDF, open again in your browser for a year.
See the report, $29See the sample first: Walmart's report is free
Questions about this company
- How much of Westlake Corporation's working time is within reach of AI?
- An estimated 19% now and 33% by the end of 2028, on METR's long-run pace at four in five, from the workforce Westlake Corporation's own annual report describes and BLS staffing patterns for its industries, never from a roster. It is an estimate with a stated method. It is not a forecast of jobs lost or of savings, and it says nothing about what the company will do.
- How many people does Westlake Corporation employ?
- 14,600 as of December 31, 2025, as its annual report for the period ending December 31, 2025 states. About 68% in the U.S.
- What kinds of work make up Westlake Corporation's workforce?
- Read from its annual report as a blend of 3 industry staffing patterns, the largest Plastics Product Manufacturing; by those patterns the work is about 34% desk work, 13% people work and 53% body work. Each share has a one-sentence reason on this page that can be checked against the filing.
- What does Westlake Corporation's annual report say about AI?
- 0 sentences in the filing name AI. Its annual reports for fiscal 2021 to 2025 name it in 0, 0, 0, 1 and 0 sentences, year by year. They are counted and quoted on this page, never judged: a count says how much a filing talks about AI, not what the company does with it.
- How is this estimated?
- Claude Fable 5.1 read the annual report under the Index's written rubric (version 1) on October 19, 2026: the stated headcount, the share in the U.S. when stated, and the workforce as a blend of industry staffing patterns. The estimates are the site's industry estimates weighted by those shares, from O*NET tasks with estimated lengths and METR's measurements of how long a task AI models can finish. A company can write to info@stratussc.com to have its reading checked against its filing.
Embed these figures on your site
A small card with the share of working time within reach now and at the end of 2027, 2028 and 2030, the date and a link back. Free under CC BY 4.0; the card carries the credit.