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Last close 79.73999786 on 2026-10-30
Founded: 1973; renamed Sanofi-Synthelabo 1999, then Sanofi-Aventis 2004
Founders: Founded as a subsidiary of French oil company Elf Aquitaine; grew via 1999 merger with Synthelabo and 2004 merger with Aventis
One of the world's largest pharmaceutical companies, built through successive mergers of French drugmakers.