Will Soft Gardasil Demand Continue to Dampen Merck's Top Line?

Core Insights - Merck's Gardasil vaccine is experiencing significant sales declines, particularly in China and Japan, with a projected negative compound annual growth rate (CAGR) of 18.1% over the next three years [1][4] Sales Performance - Gardasil sales fell by 3% in 2024 and 40% year-over-year in the first nine months of 2025, primarily due to weak demand in China and Japan [1][9] - The economic slowdown in China has led to higher-than-normal inventory levels for Merck's partner, Zhifei, prompting Merck to halt shipments of Gardasil in China until at least the end of 2025 [2][3] Competitive Landscape - Merck's other vaccines, including ProQuad, M-M-R II, Varivax, RotaTeq, and Pneumovax 23, also saw sales declines in the first nine months of 2025 [6][9] - Merck's new RSV antibody, Enflonsia, recorded $79 million in sales in Q3 2025 but faces competition from AstraZeneca/Sanofi's Beyfortus, which achieved €1.09 billion in sales in the same period, up 33.8% year-over-year [6][7] Valuation and Market Performance - Year-to-date, Merck's shares have increased by 6.3%, underperforming the industry average of 15.9% [8] - Merck's price-to-earnings ratio stands at 11.97, lower than the industry average of 16.98 and its 5-year mean of 12.56, indicating a potentially attractive valuation [10] Earnings Estimates - The Zacks Consensus Estimate for Merck's 2025 earnings per share has slightly increased from $8.94 to $8.98, while the estimate for 2026 has decreased from $9.56 to $8.81 over the past 60 days [11]