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Sanofi develops and markets drugs with a concentration in immunology, vaccines, and rare diseases. Although the company offers a diverse array of drugs, its highest-revenue product, Dupixent, accounts for over 30% of total sales. Profits for this immunology blockbuster drug are shared with Regeneron. About 45% of total revenue comes from the United States, 20% from Europe, and 6% from China.

Eli Lilly is a drug firm with a focus on neuroscience, cardiometabolic, cancer, and immunology. Lilly's key products include Verzenio and Jaypirca for cancer; Mounjaro, Zepbound, Foundayo, Jardiance, Trulicity, Humalog, and Humulin for cardiometabolic; and Taltz and Olumiant for immunology.