Westlake Corporation (WLK) Earnings: Q3 2026 Results

The quarter ended September 30, 2026 and Westlake published the results on November 4, 2026. Revenue and diluted EPS are shown against Q3 2025, the same quarter a year earlier, which takes seasonal swings out of the comparison. Westlake reports EPS two ways: GAAP, under the accounting rules every US filer follows, and excl. Identified Items, which leaves out items the company considers outside its operating results. The release reconciles the two, and when they diverge, the reconciliation says why.

• Westlake's Q3 2026 GAAP results include $58 million of Identified Items: $56 million of charges for previously announced facility shutdowns in PEM, including the Cologne, Germany PVC plant, and $2 million of other restructuring costs. Q3 2025 included a $727 million non-cash goodwill impairment for the North American Chlorovinyls reporting unit.
• Westlake acquired ACI, a compounding business now in HIP, in January 2026 and the Wilhelmshaven, Germany PVC and VCM site, now in PEM, in June 2026. Both add sales that the year-ago quarter does not have.

Source: Westlake Q3 2026 results, November 4, 2026. Also in the Form 10-Q for the quarter ended September 30, 2026. Figures as reported; checked against the release on November 10, 2026.

How Westlake splits revenue in its own release, under its own labels, for Q3 2026 against Q3 2025. Indented lines are parts of the line above them.

• Westlake's Housing and Infrastructure Products revenue was $1.1 billion in Q3 2026, flat on $1.1 billion in Q3 2025, 36% of total revenue.
• Westlake's Performance and Essential Materials revenue was $1.9 billion in Q3 2026, up 8% from $1.7 billion in Q3 2025, 64% of total revenue.

Segment lines are the figures writers cite most often, because they show where the growth in a quarter came from. Companies redraw their segments from time to time and restate the prior year to match, so a year-ago figure here can differ from the one printed a year ago. When that has happened, the note above says so.

From the earnings release

In its Q3 2026 release, Westlake said:

“4Q'26 HIP revenue is expected to be between $900 million and $1 billion with a ~13% EBITDA margin”

“Our three-pillar profitability improvement plan delivered ~$200 million of EBITDA benefit in 3Q'26 towards our FY'26 target of $600 million”

“Selling prices regained upward momentum late in 3Q'26, which could partially offset seasonally lower sales volume and rising input costs in 4Q'26”

Source: Westlake Q3 2026 earnings presentation (Exhibit 99.2 to the Form 8-K), Nov 4, 2026.

This is the company's own guidance as of Nov 4, 2026, quoted as given. Walnut does not make forecasts of its own. Analyst estimates for the coming quarters are on the WLK forecast page.

Revenue and diluted EPS for the last 5 quarters. Each date links to that quarter's release.

Net sales and GAAP diluted EPS, each as first reported in that quarter's release. The losses in Q3 2025 to Q1 2026 include Identified Items such as the Q3 2025 goodwill impairment and plant closure costs.

We do not hold a confirmed date for Westlake's next report. Companies post the date on their investor relations site a few weeks ahead, usually with the time of the conference call.

Each quarter keeps its own page with the figures as reported, so a link to one stays pointed at the same numbers after the next report.

• Q3 2026 (this page), reported Nov 4, 2026

Westlake reports two segments. Performance and Essential Materials (PEM), which makes polyethylene, PVC resin, caustic soda and other chlor-alkali and epoxy products, had net sales of $1,894 million in Q3 2026, of $2,981 million in total. Housing and Infrastructure Products (HIP), which makes siding, trim, roofing, windows, PVC pipe and fittings and compounds, had $1,087 million. (Westlake Q3 2026 release, Nov 4, 2026; Westlake Form 10-K, 2025, Feb 26, 2026)

Westlake's PEM sales rose 8% on a 9% increase in average sales price and a 4% rise in comparable volume, partly offset by a 5% net reduction from plant closures net of the Wilhelmshaven acquisition. Performance Materials grew $166 million to $1,176 million on higher polyethylene and PVC resin prices, while Essential Materials fell $19 million to $718 million on lower caustic soda volume. (Westlake Q3 2026 release, Nov 4, 2026)

Westlake's HIP sales were relatively unchanged: a 6% decline in comparable volume was offset by a 1% price increase and a 5% contribution from the January 2026 ACI acquisition. Housing Products fell $82 million to $846 million on lower roofing and siding and trim volume, and Infrastructure Products rose $78 million to $241 million because of ACI. Westlake said some pipe and fittings demand shifted into the second quarter as customers sought supply after the onset of the Middle East conflict. (Westlake Q3 2026 release, Nov 4, 2026)

Against Q2 2026, Westlake's net sales fell from $3,271 million to $2,981 million. Average sales price declined 4% and comparable volume 7%, with an 8% sequential drop in PEM's average sales price and a 17% fall in HIP volume. Westlake said European chemical conditions deteriorated in the quarter because of higher energy costs, weak demand and rising imports, and announced the closure of its Cologne PVC plant. (Westlake Q3 2026 release, Nov 4, 2026)

Westlake sells mostly in the United States: $7,954 million of its $11,170 million of 2025 net sales went to US customers, with Canada ($777 million) and Germany ($583 million) the largest foreign markets. No single customer accounted for 10% or more of either segment's net sales in 2025. (Westlake Form 10-K, 2025, Feb 26, 2026)

Westlake's GAAP diluted EPS of $0.05 in Q3 2026 includes $58 million of pre-tax Identified Items, $52 million after tax: $56 million of charges for facility shutdowns in PEM, including the Cologne PVC plant, and $2 million of other restructuring costs. Excluding them, EPS was $0.45, against a loss of $0.29 a year earlier. (Westlake Q3 2026 release, Nov 4, 2026)

Westlake's year-ago GAAP loss of $6.06 per share was driven by a $727 million non-cash impairment of all the goodwill in the North American Chlorovinyls reporting unit, plus $17 million of shutdown charges. EBITDA excluding Identified Items was $408 million, up 30% from $313 million, and the margin rose from 11% to 14%. (Westlake Q3 2026 release, Nov 4, 2026)

Westlake's pre-tax income was $8 million, with an income tax benefit of $10 million, and $12 million of net income went to noncontrolling interests, leaving $6 million attributable to Westlake. Diluted weighted average shares were 127,962,530 against 128,251,427 a year earlier. In the first nine months Westlake paid $205 million of dividends and spent $30 million on share repurchases. (Westlake Q3 2026 release, Nov 4, 2026)

Diluted EPS divides net income by the weighted average number of shares outstanding in the quarter, plus the shares that options and other equity awards could add. Buybacks shrink that count and lift EPS for the same profit; share issuance and stock awards enlarge it.

Westlake does not give a company-wide revenue or EPS outlook in its release. Its earnings presentation, filed with the same 8-K, says fourth-quarter 2026 HIP revenue is expected to be between $900 million and $1 billion with an EBITDA margin of about 13%, against $1,087 million and 18% in Q3. (Westlake Q3 2026 earnings presentation, Nov 4, 2026; Westlake Q3 2026 release, Nov 4, 2026)

For PEM, Westlake's presentation says selling prices regained upward momentum late in the third quarter, which could partially offset seasonally lower volume and rising input costs in the fourth, and that higher European energy costs are expected to also weigh on fourth-quarter earnings. Its three-pillar profitability improvement plan delivered about $200 million of EBITDA benefit in Q3 2026 toward a full-year target of $600 million. (Westlake Q3 2026 earnings presentation, Nov 4, 2026)

A consensus figure is the average of the models published by the analysts who cover Westlake, collected by a data provider and revised up to the day of the report. A quarter that lands above it says how expectations were set as much as how the business did, and the share price on the day also reflects the guidance and the lines no consensus covers.

The consensus figures on this page are Yahoo Finance's, as pulled on the date shown. Each comes with the number of analysts behind it; the smaller that number, the more one revised estimate can move the average.

The figures below are the ones Westlake's own release and filings put weight on for Q3 2026, with the latest reported value for each.

What the quarter means for a holding is a separate question from what it reported. The case for and against owning WLK is on is WLK a buy or a sell?, what analysts expect next is on the WLK forecast, and what the company does is on the Westlake Corporation (WLK) stock page.

Every number on this page can be traced to a document Westlake published. Checking one takes a couple of minutes, and it is worth doing before you quote a figure anywhere.

• The results release is the document linked in the source line above. Companies publish it on their investor relations site at the moment results go out, and it carries the headline tables: revenue, operating income, net income and EPS for the quarter and the year-ago quarter.
• The same release is filed with the SEC as Exhibit 99.1 to a Form 8-K under Item 2.02, usually on the day of the report. The SEC copy does not change after the fact, which makes it the safer thing to link when you cite a number.
• The quarterly report (Form 10-Q) follows within a few weeks and carries the full financial statements, the segment note and management's discussion of what changed. The fourth quarter is covered by the annual report (Form 10-K) instead.
• Restated comparisons are flagged in the notes on this page. When a company redraws its segments or changes how it adjusts EPS, it restates the year-ago column, so the year-ago figure in a new release can differ from the one printed a year ago. This page always uses the comparison in the newer release, because that is the like-for-like one.

A walk-through of every line in a release, with what each one tells you, is in how to read an earnings report.