Westlake Corporation (WLK) | The Buildout — AI Infrastructure
The Verdict
Westlake is a vertically integrated chemicals and building-products manufacturer. It makes the basic materials — ethylene, PVC, polyethylene, epoxy, caustic soda — and then turns PVC into pipe, siding, trim, decking, and compounds. In the AI-infrastructure build-out its role is second-derivative: PVC pipe and fittings for data-center cooling water and site work, and compounds for high-voltage wire and cable. Those sales run through distributors, not directly to data-center operators, so Westlake sees the demand second-hand. Management's own framing is that data centers are not its end customers.
| Market Cap | — |
| Revenue (TTM) | $11.3B |
| Revenue Growth | −4.0% |
| EBITDA Margin (TTM) | 0.0% |
| Net Debt | $3.9B |
| Earnings Beats | 1 of 7 |
| P/E (TTM) | — |
| EV/EBITDA (TTM) | — |
What We Like
- Over 85% of production capacity sits in North America on gas and NGL feedstock; when oil spiked in Q2 2026, Westlake's own costs fell while global selling prices rose.
- The three-pillar cost plan delivered about $300 million in H1 2026, half of the $600 million full-year target, with a $150 million reduction in first-half cost of sales.
- Epoxy went from annual losses above $100 million to profitability in Q2 2026.
- Wilhelmshaven added 380k metric tons of PVC capacity when it closed in June 2026, positioned to take U.S. feedstock and contribute from 2027.
- The balance sheet carries a weighted-average debt maturity of over 17 years at a 4% average coupon.
What We’re Watching
- PE and PVC pricing is oil-contingent — PE exited Q2 2026 slightly below the quarterly average, and July had not settled.
- HIP pricing lags cost inflation — management expects only "slight improvement" into Q3, with higher freight and logistics costs tightening margins.
- Plant reliability improved but was not fully fixed, with residual unplanned outages in Q2 2026.
- Housing remains weak, with HIP guided to the low end of $4.4–$4.6 billion revenue and 19%–21% margin, and no meaningful macro tailwind expected in 2026.
Q2 2026 showed a genuine earnings inflection: PEM swung on a favorable cost/price spread and the cost plan is delivering. The thesis now depends on whether that spread holds. Management ties future PEM pricing to oil, and HIP pricing has only partially caught up to cost inflation. The business is stronger than a year ago, but the durability — not the direction — is unresolved. The key open question: is the Q2 PEM earnings rate a re-based platform or a geopolitical spike that reverts?
Earnings
Westlake's Q2 2026 net sales were $3.3 billion at a gross margin of 19.9%, with net income of $260 million. The standout was PEM: segment EBITDA of $416 million rose $364 million year over year and $380 million sequentially, on a 21% sequential increase in average selling prices led by polyethylene and PVC resin.
| Metric | Q2 FY2026 | Q1 FY2026 | Q2 FY2025 | YoY |
|---|---|---|---|---|
| Revenue | $3.3B | $2.7B | $3.0B | +10.8% |
| Gross margin | 19.9% | 3.1% | 8.7% | +1120bps |
| EBITDA | $648M | $130M | $186M | +248.4% |
| EPS | $2.02 | $-1.32 | $-1.11 | −282.8% |
| PEM EBITDA | $416M | $36M | $52M | +$364M |
This isn't one of these programs where you have to take an off-line spreadsheet to calculate the savings. I would just point to our first half… you see $150 million of reduction in our cost of sales just in the first half of the year.— Jonathan (Jon) Baksht, Chief Financial Officer, 2026-08-04
Management tone: Across the two 2026 calls management's register moved from cautious to constructive to enumerated. Q1 framed the change bluntly — commercial conditions "changed dramatically" with the Middle East conflict. By Q2 the CEO was listing three earnings drivers (feedstock advantage, the cost plan, HIP organic growth) rather than hedging. Reliability language upgraded from "not yet where we wanted to be" to "much improved," and the new CFO declined specific free-cash-flow guidance while reaffirming deleveraging.
Management Guidance
Management guided 2026 HIP revenue to the lower end of $4.4–$4.6 billion with EBITDA margin between 19% and 21%, excluding identified items. It reaffirmed the $600 million three-pillar EBITDA target, $900 million of capex, and cash interest of about $215 million. On pricing, it expects polyethylene higher by year-end than the prior year, caustic second half above the first, and chlorine roughly flat. It did not revisit the roughly 17% effective tax rate.
Trajectory
On a trailing basis the numbers are still weak: the last four quarters averaged a 9.3% revenue decline, and 2025 was the trough — Q3 FY2025 EBITDA was negative $463 million and Q4 FY2025 negative $315 million. Q2 FY2026 marked the turn. Revenue rose to $3,271 million from $2,652 million in the prior quarter, and EBITDA swung to $648 million from $130 million. The driver was price: PEM average selling prices rose 21% sequentially while North American gas and ethane costs fell, widening the spread between Westlake's cost base and oil-linked global prices.
The Model
The model projects FY+1 revenue of $11,930 million and EBITDA of $1,957 million, a 16.4% margin. For FY+2 it projects revenue of $12,700 million and EBITDA of $2,261 million, a 17.8% margin. The near term is anchored on the three-pillar cost program and PEM pricing holding at the Q2 level. FY+2 adds the Wilhelmshaven contribution, expected beginning next year, plus continued Pipe & Fittings volume growth.
| Metric | FY2025 | Next FY (E) | Following FY (E) |
|---|---|---|---|
| Revenue | $11.2B | $11.9B | $12.7B |
| YoY Growth | — | +6.8% | +6.5% |
| EBITDA | −$341M | $2.0B | $2.3B |
| EBITDA Margin | -3.1% | 16.4% | 17.8% |
Projections are the median of 5 independent model runs. The model’s revenue sits 5.7% above analyst consensus.
Management guided 2026 HIP revenue to the lower end of $4.4–$4.6 billion with EBITDA margin between 19% and 21%, excluding identified items. It reaffirmed the $600 million three-pillar EBITDA target, $900 million of capex, and cash interest of about $215 million. On pricing, it expects polyethylene higher by year-end than the prior year, caustic second half above the first, and chlorine roughly flat. It did not revisit the roughly 17% effective tax rate.
What Could Go Right — and Wrong
- PEM pricing holds while oil normalizes, turning the Q2 earnings rate into a base rather than a spike.
- The three-pillar program completes at $600 million and carries into 2027.
- Data-center demand proves larger and stickier than the company can currently measure.
- Wilhelmshaven integrates on schedule and contributes to PEM sales and earnings from 2027.
- Housing stabilizes and HIP margin recovers from the low end of its guided range.
- Oil normalizes, the pricing umbrella closes, and PEM EBITDA reverts toward the Q1 rate.
- Transportation and raw-material cost inflation outpaces HIP pricing, keeping segment margin compressed.
- Housing stays soft into 2027, holding HIP margin at the low end of guidance.
- Plant reliability slips again, putting the cost program at risk.
- The Olin/Huntsman combination reshapes epoxy and chlor-alkali competition before H1 2027.
Looking Ahead
Over the next year the question is whether the PEM pricing umbrella holds and whether the cost program finishes. Management points to the second half of 2026 running at higher operating rates with few planned shutdowns, the Wichita Falls PVCO pipe plant starting up at the end of 2026, and Wilhelmshaven integrating into the Westlake system ahead of a 2027 contribution. Data-center demand for Pipe & Fittings is expected to keep growing, but the company cannot put a number on it, and the two remaining PVC-pipe litigation categories are unresolved.
- Q3 2026Q3 pipe volume — Tests whether Pipe & Fittings demand grew past the Q2 pull-forward.
- H2 2026Plant reliability — Higher operating rates with no unplanned outages.
- H2 2026Wilhelmshaven integration — Site integration ahead of a 2027 earnings contribution.
- End of 2026Wichita Falls start-up — New PVCO pipe plant supporting Pipe & Fittings volume.
- Full-year 2026$600M cost target — Full-year realization of the three-pillar program.
- By year-end 2026PE and PVC prices — Settled prices versus the prior year; July/August the test.
Financials
Annual Summary
| Metric | FY2024 | FY2025 | TTM | YoY |
|---|---|---|---|---|
| Revenue | $12.1B | $11.2B | $11.3B | -8.0% |
| Gross Margin | 16.0% | 2.0% | 4.7% | 1,400bps |
| EBITDA | $2.0B | −$341M | $0M | -117.1% |
| EBITDA Margin | 16.4% | -3.1% | 0.0% | 1,943bps |
| Net Income | $602M | −$1.5B | −$1.2B | -350.5% |
| Free Cash Flow | $306M | −$530M | −$265M | — |
| Net Cash | — | — | — | — |
Key Ratios (Trailing)
- P/E TTM—
- EV/EBITDA TTM—
- EV/Revenue TTM—
- Price/FCF TTM—
- Gross Margin (TTM)4.7%
- EBITDA Margin (TTM)0.0%
- Net Margin (TTM)-10.9%
- ROIC-7.7%
- SBC / Revenue0.4%
The Company
Westlake is a vertically integrated manufacturer of housing and infrastructure products and performance and essential materials. It runs two segments: Housing and Infrastructure Products (HIP) — residential PVC siding, trim, windows, decking, roof tiles, PVC pipe and fittings, and compounds — and Performance and Essential Materials (PEM) — ethylene, PVC, polyethylene, epoxy, and caustic soda. Those materials are the raw stock for building products, packaging, and infrastructure. In the AI build-out Westlake appears in PVC pipe and fittings for data-center cooling water and site work, and in high-voltage wire and cable compounds.
The company is vertically integrated, which is the analytical center of the story. It makes ethylene from North American natural gas and NGLs, upgrades that into PVC resin, polyethylene, and chlor-alkali, then converts PVC into pipe, siding, trim, decking, and compounds. Over 85% of production capacity sits in North America, anchoring a feedstock cost advantage against oil-linked global competitors. It operates named plants including Calvert City, KY; Lake Charles, Plaquemine, and Geismar, LA; Longview and Deer Park, TX; Lakeland, FL; Natrium, WV; Longview, WA; Beauharnois, Quebec; and sites in Germany, Spain, and South Korea.
Business Segments
Competitive Landscape
Westlake's cost position is structurally advantaged — North American gas and ethane feedstock against oil-linked global competitors — but its products are commodity-adjacent and replaceable at the product level. The FY2025 10-K names competitors across building products, compounds, ethylene and polyethylene, chlor-alkali and PVC, and the epoxy value chain. The strongest third-party datapoint comes from a customer: Atkore names Westlake one of its three primary PVC resin suppliers.
- Named in the 10-K as an ethylene and polyethylene competitor. Dow's Q3 guide assumes a $0.10/lb decline in global integrated PE margins including the $0.15/lb June North American settlement — more conservative than Westlake's year-end optimism.
- Named in the 10-K in chlor-alkali, PVC, and epoxy. Olin's Freeport VCM/DCM outage cost it $40M in Q2 adjusted EBITDA, with full capacity expected by end of Q3; it announced a merger with Huntsman (close not before H1 2027).
- Named in the 10-K in epoxy. Huntsman reported Advanced Materials volumes +8% and European gas above $20/MMBtu; it is merging with Olin.
- Formosa Plastics CorporationNamed in the 10-K as a competitor in polyethylene and in chlor-alkali/PVC; also named by Atkore as one of its three primary PVC resin suppliers.
- Occidental Chemical CorporationNamed in the 10-K as a chlor-alkali and PVC competitor; Atkore names "Oxy Vinyls" among its three primary PVC resin suppliers.
Supply Chain
Westlake sits upstream in the chain. It buys North American ethane and NGLs, makes ethylene, PVC resin, polyethylene, and chlor-alkali, converts PVC into pipe, siding, and compounds, and sells through distributors. No data-center operator or hyperscaler is named as a customer.
Related companies
See all Construction companies → · How this layer works: Chapter 4, The Building →
More on WLK: Earnings recap