---
schema_version: "secwatch.filing_event.v1"
accession: "0000105770-23-000075"
form_type: "8-K"
ticker: "WST"
cik: "0000105770"
company_name: "WEST PHARMACEUTICAL SERVICES INC"
filed_at: "2023-11-30T23:59:59+00:00"
generated_at: "2026-06-07T19:46:39.767445+00:00"
event_type: "other_material"
sentiment: "neutral"
materiality_score: 0.6
calibrated_materiality_score: 0.6
confidence: "high"
source: SEC EDGAR
---

# West Pharmaceutical extends butyl polymer supply agreement with ExxonMobil through 2028

## Summary
- Amendment secures supply of butyl polymers, a key raw material for pharmaceutical packaging, from 2024 to 2028.
- Pricing includes base price plus adjustments based on Brent crude, UK natural gas, and USGC isobutylene indices (redacted).
- Product qualification at Baton Rouge plant waives isobutylene adjustment during contract term as incentive.
- New sustainability collaboration provision added, with joint discussions on activities and milestones.

## SEC filing metadata
- accession: 0000105770-23-000075
- form_type: 8-K
- ticker: WST
- cik: 0000105770
- company_name: WEST PHARMACEUTICAL SERVICES INC
- filed_at: 2023-11-30T23:59:59+00:00
- event_type: other_material
- sentiment: neutral
- materiality_score: 0.6
- calibrated_materiality_score: 0.6
- confidence: high
- sec_items: 1.01, 9.01
- EDGAR index: https://www.sec.gov/Archives/edgar/data/105770/000010577023000075/0000105770-23-000075-index.htm
- EDGAR primary document: https://www.sec.gov/Archives/edgar/data/105770/000010577023000075/wst-20231127.htm

## Machine-readable alternates
- HTML: https://secwatch.observer/filing/0000105770-23-000075
- JSON: https://secwatch.observer/filing/0000105770-23-000075.json
- Plain text: https://secwatch.observer/filing/0000105770-23-000075.txt

## Key facts
- Material Agreements
  WEST PHARMACEUTICAL SERVICES INC amended global master supply agreement with ExxonMobil Product Solutions Company (effective 2023-11-27).
  - Action: amendment
  - Agreement: supply
  - Counterparty: ExxonMobil Product Solutions Company
  - Effective: 2023-11-27
  source text: On November 27, 2023, West Pharmaceutical Services, Inc. (the “Company”) executed an amendment to the global master supply agreement (the “Amendment”) with ExxonMobil Product Solutions Company (“EMPSC”).
  evidence_url: https://www.sec.gov/Archives/edgar/data/105770/000010577023000075/0000105770-23-000075-index.htm

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