---
schema_version: "secwatch.filing_event.v1"
accession: "0000105770-26-000068"
form_type: "8-K"
ticker: "WST"
cik: "0000105770"
company_name: "WEST PHARMACEUTICAL SERVICES INC"
filed_at: "2026-05-11T21:06:38+00:00"
generated_at: "2026-05-11T21:09:42.327283+00:00"
event_type: "cyber"
sentiment: "negative"
materiality_score: 1.0
calibrated_materiality_score: 1.0
confidence: "high"
source: SEC EDGAR
---

# West Pharmaceuticals discloses material cyberattack; data exfiltrated, systems encrypted on May 4 2026

## Summary
- Incident detected May 4, 2026; determined material on May 7, 2026.
- Unauthorized party exfiltrated data and encrypted systems; company took systems offline globally for containment.
- Engaged Palo Alto Networks' Unit 42 for investigation, containment, and recovery; law enforcement notified.
- Business operations temporarily disrupted globally; core systems restored, but shipping/receiving/manufacturing restarted at some sites only.
- Financial and operational impact not yet determined; investigation ongoing.

## SEC filing metadata
- accession: 0000105770-26-000068
- form_type: 8-K
- ticker: WST
- cik: 0000105770
- company_name: WEST PHARMACEUTICAL SERVICES INC
- filed_at: 2026-05-11T21:06:38+00:00
- event_type: cyber
- sentiment: negative
- materiality_score: 1.0
- calibrated_materiality_score: 1.0
- confidence: high
- sec_items: 1.05, 7.01, 99.1, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/105770/000010577026000068/0000105770-26-000068-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/105770/000010577026000068/wst-20260507.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000105770-26-000068
- JSON: https://secwatch.observer/filing/0000105770-26-000068.json
- Plain text: https://secwatch.observer/filing/0000105770-26-000068.txt

## Key facts
- Cybersecurity Incidents
  WEST PHARMACEUTICAL SERVICES INC disclosed a cybersecurity incident: Cybersecurity attack involving data exfiltration by an unauthorized party and encryption of certain systems. Impact: Temporarily disrupted business operations globally; core enterprise systems restored; shipping, receiving, and manufacturing restarted at some sites with restoration of remaining sites in process; material impact on financial condition and results of operations not yet determined. Company determined it material. Discovered 2026-05-04.
  - Nature: Cybersecurity attack involving data exfiltration by an unauthorized party and encryption of certain systems
  - Impact: Temporarily disrupted business operations globally; core enterprise systems restored; shipping, receiving, and manufacturing restarted at some sites with restoration of remaining sites in process; material impact on financial condition and results of operations not yet determined
  - Materiality: determined material
  - Discovery: 2026-05-04
  source text: On May 7, 2026, West Pharmaceutical Services, Inc. (the “Company”) determined that the Company has experienced a material cybersecurity attack, in which certain data was exfiltrated by an unauthorized party and certain systems were encrypted.
  evidence_url: https://www.sec.gov/Archives/edgar/data/105770/000010577026000068/0000105770-26-000068-index.htm

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