Alexion Pharmaceuticals was a biopharmaceutical company primarily known for its development and commercialization of Soliris (eculizumab), a groundbreaking treatment for rare and ultra-rare disorders. Financially, Alexion navigated a complex landscape of high research and development costs, specialized manufacturing, and the challenges of pricing and market access for its life-saving therapies. The company’s financial success was largely driven by Soliris. As an innovative treatment for paroxysmal nocturnal hemoglobinuria (PNH) and atypical hemolytic uremic syndrome (aHUS), Soliris commanded a premium price, reflecting its significant clinical benefits and the lack of alternative treatments for these debilitating conditions. This high price, however, also attracted scrutiny from payers and advocacy groups concerned about affordability and access. Alexion consistently defended its pricing strategy by emphasizing the high cost of research and development, the complexity of manufacturing biologic therapies, and the significant clinical value provided to patients with rare diseases. Alexion’s revenue stream was heavily reliant on Soliris. While this concentration provided substantial profits, it also exposed the company to risks associated with patent expiration and potential competition from biosimilars. To mitigate this risk, Alexion invested heavily in research and development to expand the indications for Soliris and develop new therapies for other rare diseases. This strategy led to the development and launch of Ultomiris (ravulizumab), a next-generation complement inhibitor with a longer dosing interval than Soliris, offering improved convenience for patients and providing Alexion with a longer period of market exclusivity. Financially, the launch of Ultomiris was a crucial strategic move. It allowed Alexion to transition patients from Soliris to Ultomiris, effectively extending the revenue stream from its core complement inhibitor franchise. The company actively managed this transition, incentivizing physicians and patients to switch to the newer therapy. Alexion also pursued strategic acquisitions to diversify its pipeline and expand its therapeutic focus. These acquisitions often involved companies with promising therapies in early or mid-stage development for rare diseases. While these acquisitions provided growth opportunities, they also required significant investment and integration efforts. From a financial reporting perspective, Alexion adhered to generally accepted accounting principles (GAAP). Investors closely monitored metrics such as revenue growth, operating income, net income, and cash flow. Analysts also paid close attention to the company’s research and development spending, its sales and marketing expenses, and its financial guidance. Ultimately, Alexion’s financial success and strategic direction attracted the attention of larger pharmaceutical companies. In 2020, AstraZeneca announced its acquisition of Alexion for $39 billion. This acquisition reflected AstraZeneca’s desire to expand its presence in rare diseases and leverage Alexion’s expertise in complement biology and its established global infrastructure for commercializing specialized therapies. The acquisition marked the end of Alexion as an independent entity, but its financial legacy as a pioneer in rare disease therapeutics continues to influence the biopharmaceutical industry.