Who West Pharmaceutical buys from and sells to
Makes rubber stoppers, plungers and seals for injectable drugs, plus contract-made delivery devices.
Part of GLP-1 and Specialty Pharmaceuticals spending
Buys from 2
- Daikyo Seikolicensed Crystal Zenith polymer and NovaPure components (49% owned)
- Elastomer and resin makerssingle-source raw materials for qualified components
Where the chain could break
- One customer was 15.8% of 2025 sales and the top ten 47.6%
- GLP-1 work was ~18% of Q2 2026 sales, tied to two drug makers' volumes
- Some critical raw materials are single-source; swaps need regulatory requalification
Competes with
- StevanatoSTVNvials, syringes and drug-delivery systems
- Datwylerelastomer stoppers and plungers
- Becton DickinsonBDXprefillable syringes and components
Mapped by hand from filings and company reporting, as of October 2026. It shows the relationships that matter most, not every contract: most are never disclosed, and agreements change.