PUK vs BIIB Comparison

Originally established as Prudential Mutual Assurance, Investment, and Loan Association in 1848, Prudential plc has moved on a lot since then. Set up to sell life insurance and loans to the middle and then the industrializing and urbanizing working classes, the company subsequently diversified into Europe and then North America with the purchase of Jackson National Life in around 1985. During its time as owner of Jackson, Prudential focused on building out a simple chassis-style product portfolio where customers could choose a variety of add-ons. The company also became renowned for its focus on building requisite internal capabilities to support its strong product offerings, including compelling technology and a large and well-trained wholesale 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).