# Who does West Pharmaceutical Services pay? Who are its key suppliers?
Canonical: https://valuechain.wiki/west-pharmaceutical-services · Facet: suppliers · Updated: 2026-09-24T09:58:55.2377+00:00 · Source: ValueChain.wiki (cited money-flow graph)

**Citable summary**: West Pharmaceutical Services's confirmed suppliers/cost counterparties include ExxonMobil plus 1 undisclosed/aggregate relationship. Per the valuechain.wiki graph: 2 cost edges, backed by 3 dated sources, 3 of them primary filings (as of 2026-09-24).

### Daikyo Seiko (high)
- metric: Market share 49 percent · as of 2026-07-14 · Ownership interest in Daikyo
- note: West owns 49% of Daikyo. The companies exchange technology and jointly develop pharmaceutical packaging and delivery components.
- [confirms] SEC EDGAR (EN, filing, published 2026-07-14) https://www.sec.gov/Archives/edgar/data/105770/000010577026000093/wst-20260714.htm: "The Company maintains a 49% ownership interest in Daikyo."

### 엑슨모빌 (high)  → /exxonmobil.md
- note: ExxonMobil Product Solutions supplies products to West and its affiliates under a global master supply agreement running through 2028. Product, volume and price details are redacted.
- [confirms] SEC EDGAR (EN, filing, published 2023-11-30) https://www.sec.gov/Archives/edgar/data/105770/000010577023000075/exhibit1040exxonamendmen.htm: "sets forth the terms and conditions for the sale and delivery of Product(s)"

### Daikyo Seiko (high)
- note: West purchases Daikyo products for exclusive distribution outside Japan. Most 2025 purchases from and payments to affiliates related to this arrangement, but the Daikyo-only amount was not disclosed.
- [confirms] SEC EDGAR (EN, filing, published 2026-07-14) https://www.sec.gov/Archives/edgar/data/105770/000010577026000093/wst-20260714.htm: "exclusive distributor of Daikyo products in all countries other than Japan"
- [confirms] SEC EDGAR (EN, filing, published 2026-02-17) https://www.sec.gov/Archives/edgar/data/105770/000010577026000010/wst-20251231.htm: "The majority of the purchase transactions listed above relate to a distributorship agreement with Daikyo."

Reverse side: https://valuechain.wiki/west-pharmaceutical-services/customers.md · Ripple: https://valuechain.wiki/west-pharmaceutical-services/ripple.md

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