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WestlakeWLK -1.70%60 1-Year ROIIC % is 73.26 as of Mar. 2026. GuruFocus rates WLK with a GF Score™ of 60/100 and a GF Value™ of $105.64 (Possible Value Trap). The stock has 4 warning signs investors should review. Among 1,508 Chemicals companies, Westlake ranks better than 87.27% on this metric.
1-Year Return on Invested Incremental Capital (1-Year ROIIC %) measures the change in earnings as a percentage of change in investment over 1-year.
Westlake's 1-Year ROIIC % for the quarter that ended in Mar. 2026 was 73.26%. High ROIIC is generally an indication that your business is capital efficient or has a higher operating leverage.
The industry rank for Westlake's 1-Year ROIIC % or its related term are showing as below:
WLK's 1-Year ROIIC % is ranked better than 87.27% of 1508
companies
in the Chemicals industry
Industry Median: 1.335
vs WLK: 73.26
Return on Incremental Invested Capital (ROIIC) is an extension of Return on Investment Capital (ROIC). ROIC % tells investors how efficiently that profitability is earned per dollar of company capital. ROIIC narrows the focus even further and shows how profitable each additional unit of capital investment could be. ROIIC % is a more powerful metric than ROIC because it measures how much money the company can generate going forward on future capital investments.
High ROIIC is generally an indication that your business is capital efficient or has a higher operating leverage.
Be Aware
It's important to keep in mind that when tracking ROIIC, the metric is better suited to forecasting the trend of future returns rather than measuring current return on investment.
Westlake 1-Year ROIIC % Related Terms
Westlake 1-Year ROIIC % Historical Data
* Premium members only.
The historical data trend for Westlake's 1-Year ROIIC % can be seen below:
* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD. * For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.
For the Specialty Chemicals subindustry, Westlake's 1-Year ROIIC %, along with its competitors' market caps and 1-Year ROIIC % data, can be viewed below:
* Competitive companies are chosen from companies within the same industry, with headquarter located in same country, with closest market capitalization; x-axis shows the market cap, and y-axis shows the term value; the bigger the dot, the larger the market cap. Note that "N/A" values will not show up in the chart.
Westlake 1-Year ROIIC % vs Chemicals Industry
For the Chemicals industry and Basic Materials sector, Westlake's 1-Year ROIIC % distribution charts can be found below:
* The bar in red indicates where Westlake's 1-Year ROIIC % falls into.
Westlake's 1-Year ROIIC % for the quarter that ended in Mar. 2026 is calculated as:
1-Year ROIIC %
=
1-Year Incremental Net Operating Profit After Taxes (NOPAT)**
/
1-Year Incremental Invested Capital
=
( -279.8274 (Mar. 2026) - 467.3756 (Mar. 2025) )
/
( 15158 (Mar. 2026) - 16178 (Mar. 2025) )
=
-747.203
/
-1020
=
73.26%***
* For Operating Data section: All numbers are indicated by the unit behind each term and all currency related amount are in USD. * For other sections: All numbers are in millions except for per share data, ratio, and percentage. All currency related amount are indicated in the company's associated stock exchange currency.
** TTM data of NOPAT and Invested Capital was used to calculate 1-Year ROIIC %.
*** Please be aware that the ROIIC (Return on Invested Capital) calculations are based on company-level data using the primary share class. The calculated data provided is for demonstration purposes and may slightly differ from the results displayed in the title due to potential variations caused by currency exchange rate differences throughout the year.
Westlake (WLK) has a 1-Year ROIIC % of 73.26 as of Mar. 2026. 1-Year ROIIC % measures the change in earnings as a percentage of change in investment over 1-year. View historical data on Westlake and its competitors. According to the industry distribution chart, Westlake ranks #192 out of 1508 companies in the Chemicals industry, placing it in the top 12.7%.
Is Westlake's 1-Year ROIIC % too high?
Westlake's current 1-Year ROIIC % is 73.26. The Chemicals industry median 1-Year ROIIC % is 1.34. Westlake's value of 73.26 is 5387.6% above this industry median. Based on the distribution chart, Westlake ranks #192 out of 1508 companies in the Chemicals industry, which is in the top quartile — a strong position relative to peers. Overall, Westlake has a GF Score™ of 60/100 and is considered Possible Value Trap, reflecting its overall financial health beyond just this single metric.
How does Westlake's 1-Year ROIIC % compare to SOLS and ESI?
According to the Chemicals industry distribution chart, Westlake ranks #192 out of 1508 companies for 1-Year ROIIC %. This places Westlake in the top 13% of its industry — outperforming the majority of peers. The industry median 1-Year ROIIC % is 1.34. Westlake's value of 73.26 is 5387.6% above this benchmark. See the competitive comparison table and distribution chart on this page for a detailed peer-by-peer breakdown.
What is a good 1-Year ROIIC % for a Chemicals company?
The median 1-Year ROIIC % among Chemicals companies is 1.34, based on 1,508 companies in the industry. Companies in the top quartile (top 25%) have a 1-Year ROIIC % significantly above this median, while those in the bottom quartile fall well below. However, 1-Year ROIIC % should not be evaluated in isolation — investors should consider it alongside profitability, growth, and financial strength metrics. Westlake's current 1-Year ROIIC % of 73.26 is 5387.6% above the industry median. Use the industry distribution chart on this page to see where any company falls relative to its peers.
What does a high 1-Year ROIIC % mean?
A high 1-Year ROIIC % can signal that a stock is expensive relative to its fundamentals. 1-Year ROIIC % measures the change in earnings as a percentage of change in investment over 1-year. View historical data on Westlake and its competitors. For the Chemicals industry, the median 1-Year ROIIC % is 1.34 — values significantly above this may indicate overvaluation, while values below may suggest a bargain or underlying issues. Westlake's current 1-Year ROIIC % is 73.26. However, context matters — high-growth companies often justify higher valuations. Always evaluate alongside other metrics like GF Score™ and GF Value™.
Is Westlake stock overvalued right now?
Based on GuruFocus' analysis, Westlake (WLK) is currently considered Possible Value Trap. The stock's GF Value™ is $105.64, compared to a current price of $70.50 — trading 33.3% below its estimated fair value. The current 1-Year ROIIC % is 73.26 and 5387.6% above the Chemicals industry median of 1.34. Westlake's overall GF Score™ is 60/100 with 4 warning signs to review. Investors should evaluate multiple metrics — including profitability, growth, and financial strength — before making a decision.
How is 1-Year ROIIC % calculated?
1-Year ROIIC % is calculated from a company's financial statements. For Westlake (WLK), the current 1-Year ROIIC % is 73.26 as of Mar. 2026. GuruFocus calculates this using data sourced from SEC filings and annual reports. See the calculation section and 30-year financial data on this page for the full breakdown.
Is Westlake (WLK) Overvalued in 2026?
Based on GuruFocus' analysis, Westlake stock appears to be undervalued.
The current stock price of $70.50 is trading 33.3% below its estimated GF Value™ of $105.64.
GuruFocus considers Westlake to be Possible Value Trap.
Key valuation signals for WLK:
1-Year ROIIC %: 73.26
GF Value™: $105.64 vs. price of $70.50 (33.3% below fair value)
Industry Position: 5387.6% above the Chemicals median (#192 of 1508)
No single metric tells the full story. See the WLK stock analysis page for a complete view including 30-year financials, guru trades, and insider activity.
Westlake is a forward-integrated commodity chemicals firm based in Houston. It began as a single low-density polyethylene plant and expanded its capabilities to include ethylene, vinyl chloride monomers, and polyvinyl chloride over the next two decades. The acquisition of Axiall in 2016 made it a North American leader in chlor-alkali and PVC. Today, Westlake has two defined segments: performance and essential materials, and housing and infrastructure products. The HIP segment began operating in 2022 following a series of acquisitions in the building products space. The firm aims to maximize the value of its chemical production by integrating with the HIP segment, realizing the higher margins of finished commercial goods.
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