Can Biogen Stock Rebound as New Drugs Aim to Offset MS Sales Declines?

Core Insights - Biogen's key multiple sclerosis (MS) drugs, including Tecfidera and Tysabri, along with the spinal muscular atrophy (SMA) treatment Spinraza, are experiencing declining sales due to increased competition, impacting overall revenue growth [1][3][10] Sales Performance - Sales of Tecfidera are declining due to the launch of multiple generic versions in North America, Brazil, and certain European countries [3] - Tysabri's sales are also declining as a result of heightened competition in the U.S. and the introduction of biosimilars in Europe, with a U.S. biosimilar expected by Q4 2025 [3][4] - Spinraza's revenues are anticipated to be lower in the second half of the year due to unfavorable shipment timing and competition from Novartis' Zolgensma and Roche's Evrysdi [5] New Drug Developments - Biogen's collaboration with Eisai on Leqembi for Alzheimer's disease shows potential for long-term growth, with sequential sales improvements noted over the past four quarters [6][10] - Leqembi has been launched in multiple countries and is expected to generate significant sales due to the unmet need in Alzheimer's treatment [7] - Skyclarys is witnessing strong demand trends, particularly in the U.S. and EU, with ex-U.S. sales projected to become a more significant growth driver in 2025 [9] Financial Outlook - Biogen's total revenues rose by 7% in the first half of 2025, driven by new drug sales, although the overall revenue for 2025 is projected to remain flat compared to 2024 [11][12] - The contribution from new drugs is increasing, but it is not yet sufficient to offset the declining revenues from MS drugs and Spinraza [12] Valuation and Estimates - Biogen's stock has declined by 2.2% this year, contrasting with an 8.7% increase in the industry [13] - The company's shares are trading at a forward price/earnings ratio of 9.49, lower than the industry average of 15.88 and its own 5-year mean of 13.55 [15] - The Zacks Consensus Estimate for 2025 earnings has increased from $14.87 to $15.68 per share over the past 90 days [16]