Question · Q4 2025
Alex Hammond asked about the expected cadence of Leqembi sales growth for the year, specifically inquiring about the timing and percentage of patients likely to transition to maintenance therapy and its potential impact on revenue.
Answer
Christopher A. Viehbacher, President and CEO of Biogen, explained that Leqembi is expected to see continued sequential quarter-on-quarter growth, with approximately 70% persistency for patients moving to maintenance. He noted the progressive uptake of the subcutaneous pen despite incomplete reimbursement, which requires formulary exemptions. Increased use of blood-based diagnostics is aiding patient identification. The potential approval of the iClick for induction could be a significant catalyst, potentially leading to full reimbursement for both induction and maintenance by 2027. He anticipates continued linear growth in the first half of 2026, with potential acceleration in the latter half and into 2027, driven by strong direct-to-consumer advertising and positive physician feedback.
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