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| Period | GLP-1 elastomers (%) | GLP-1 West Vantage / CM (%) | Printed total |
|---|---|---|---|
| Q3 2025 | 9 | 8 | 17 |
| Q4 2025 | 10 | 7 | 17 |
| Q1 2026 | 10 | 8 | 18 |
| Q2 2026 | 10 | 8 | 18 |
Herman O. West founds the company (1923) to make rubber closures for injectable medicines. Elastomer stoppers and plungers for vaccines sit on this line.
West lists on the public market (1970). High-value components (including GLP-1 and vaccine elastomers) are the modern mix, not a vaccine-only P&L.