FTAI vs BIIB Comparison

FTAI Aviation Ltd is an independent engine maintenance platform focused on the CFM56-5B, CFM56-7B, and V2500 aircraft engines, which power the 737NG and A320ceo aircraft. The company repairs and rebuilds engines in its maintenance facilities and with joint venture partners, and sells or leases engines through its proprietary Maintenance, Repair and Exchange (MRE) model under the Aerospace Products segment, which earns maximum revenue from North America and develops, repairs/refurbishes, and sells aircraft engines and aftermarket components. It also operates an Aviation Leasing segment, owning and managing a portfolio of on- and off-lease aircraft and engines, including engine transfers for rebuilding and sales.

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).