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Biogen is an established biopharmaceutical company focused on treatments for neurodegenerative and rare diseases. Its declining multiple sclerosis franchise is its largest revenue generator and contributed 40% of total revenue in 2025. Biogen also generates significant revenue from its CD20 collaboration agreements with Roche (19% of total in 2025), which includes oncology drugs Rituxan and Gazyva and multiple sclerosis drug Ocrevus. Biogen's newer franchises include Spinraza (spinal muscular atrophy, with partner Ionis), Leqembi (Alzheimer's disease, collabroation revenue from its partner Eisai), Skyclarys (Friedreich's ataxia, Reata), Zurzuvae (postpartum depression, Sage), and Qalsody (amyotrophic lateral sclerosis, Ionis).

AbbVie is a pharmaceutical firm with a strong exposure to immunology (with Humira, Skyrizi, and Rinvoq) and oncology (with Imbruvica and Venclexta). The company was spun off from Abbott in early 2013. The 2020 acquisition of Allergan added several new products and drugs in aesthetics, including Botox. The 2024 acquisitions of Cerevel (neuroscience) and ImmunoGen (oncology) help supplement AbbVie's portfolio.