---
schema_version: "secwatch.filing_event.v1"
accession: "0001262823-26-000008"
form_type: "8-K"
ticker: "WLK"
cik: "0001262823"
company_name: "WESTLAKE CORP"
filed_at: "2026-02-24T23:59:59+00:00"
generated_at: "2026-05-16T00:41:38.817202+00:00"
event_type: "earnings"
sentiment: "negative"
materiality_score: 0.8
calibrated_materiality_score: 0.8
confidence: "high"
source: SEC EDGAR
---

# Westlake Q4 net loss $544M (-$4.22/sh); FY loss $1.51B; targets $600M EBITDA improvement

## Summary
- Net loss $544M (GAAP diluted EPS -$4.22); adjusted net loss $33M (-$0.25/sh) excl. $511M shutdown & restructuring items.
- Revenue $2.53B (-11% YoY); full-year revenue $11.17B (-8% YoY) driven by lower PEM volumes and pricing.
- PEM segment EBITDA excl. items $45M (Q4) vs $220M a year ago; HIP EBITDA $146M vs $188M.
- Company targets $600M EBITDA improvement in 2026 via footprint optimization, cost savings, and plant reliability.
- Achieved $170M cost savings in FY2025; HIP expected to benefit from ACI acquisition in early 2026.

## SEC filing metadata
- accession: 0001262823-26-000008
- form_type: 8-K
- ticker: WLK
- cik: 0001262823
- company_name: WESTLAKE CORP
- filed_at: 2026-02-24T23:59:59+00:00
- event_type: earnings
- sentiment: negative
- materiality_score: 0.8
- calibrated_materiality_score: 0.8
- confidence: high
- sec_items: 2.02, 7.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/1262823/000126282326000008/0001262823-26-000008-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/1262823/000126282326000008/wlk-20260224.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0001262823-26-000008
- JSON: https://secwatch.observer/filing/0001262823-26-000008.json
- Plain text: https://secwatch.observer/filing/0001262823-26-000008.txt

This AI-assisted summary is a reading aid. Review the linked SEC EDGAR filing before relying on any specific claim.