---
schema_version: "secwatch.filing_event.v1"
accession: "0000105770-26-000077"
form_type: "8-K/A"
ticker: "WST"
cik: "0000105770"
company_name: "WEST PHARMACEUTICAL SERVICES INC"
filed_at: "2026-05-20T20:04:33+00:00"
generated_at: "2026-05-20T20:06:21.432767+00:00"
event_type: "cyber"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# West Pharmaceutical provides update on May 4 cyberattack; fully operational, no material financial impact

## Summary
- Cybersecurity incident detected on May 4, 2026 involved data exfiltration and system encryption.
- Company activated response, took systems offline globally; core enterprise and manufacturing systems restored.
- All manufacturing, supply chain, and commercial sites globally are now fully operational.
- No unauthorized access observed since May 5; investigation continues but incident not expected to materially affect Q2 or FY 2026 guidance.

## SEC filing metadata
- accession: 0000105770-26-000077
- form_type: 8-K/A
- ticker: WST
- cik: 0000105770
- company_name: WEST PHARMACEUTICAL SERVICES INC
- filed_at: 2026-05-20T20:04:33+00:00
- event_type: cyber
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 1.05, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/105770/000010577026000077/0000105770-26-000077-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/105770/000010577026000077/wst-20260507.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000105770-26-000077
- JSON: https://secwatch.observer/filing/0000105770-26-000077.json
- Plain text: https://secwatch.observer/filing/0000105770-26-000077.txt

## Key facts
- Cybersecurity Incidents
  WEST PHARMACEUTICAL SERVICES INC disclosed a cybersecurity incident: data exfiltrated by unauthorized party and systems encrypted. Impact: no material impact on financial guidance; fully operational. Company determined it not material. Discovered 2026-05-04.
  - Nature: data exfiltrated by unauthorized party and systems encrypted
  - Impact: no material impact on financial guidance; fully operational
  - Materiality: not material
  - Discovery: 2026-05-04
  source text: Based on the investigation to date and information currently available, the Company believes that the incident has not had, and is not reasonably likely to have, a material impact on the Company’s 2026 second-quarter and full-year financial guidance.
  evidence_url: https://www.sec.gov/Archives/edgar/data/105770/000010577026000077/0000105770-26-000077-index.htm

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