Merck Falls 14% YTD: Time to Buy, Sell or Hold the Stock?

Core Insights - Merck (MRK) is a leading pharmaceutical company with a strong oncology portfolio, primarily driven by its blockbuster drug Keytruda, which accounts for over 50% of pharmaceutical sales [6][9][25] - The company is actively pursuing mergers and acquisitions to enhance its pipeline and diversify its product offerings, particularly in light of the impending loss of exclusivity for Keytruda in 2028 [11][19][30] - Despite strong sales growth from Keytruda, Merck faces challenges including a significant decline in Gardasil sales due to weak demand in China and competitive pressures on its drug portfolio [16][19][30] Group 1: Keytruda and Sales Performance - Keytruda's sales rose approximately 7% in the first half of 2025, benefiting from increased uptake in early-stage non-small cell lung cancer [7][9] - Merck is developing new strategies to sustain Keytruda's growth, including innovative combinations with other therapies and a subcutaneous formulation under FDA review [8][10] - The company's shares have declined nearly 14% in 2025, underperforming the industry and the S&P 500 [2][9] Group 2: Pipeline and M&A Activity - Merck's pipeline has nearly tripled since 2021, with plans to launch around 20 new vaccines and drugs, including Capvaxive and Winrevair, which have strong revenue potential [12][15] - The acquisition of Verona Pharma for approximately $10 billion is expected to bolster Merck's cardio-pulmonary pipeline [15][29] - Regulatory progress includes the approval of the RSV antibody Enflonsia in the U.S. and ongoing reviews for other products [13][14] Group 3: Challenges and Market Dynamics - Gardasil sales fell 48% in the first half of 2025, primarily due to sluggish demand in China, leading to a temporary halt in shipments [16][17] - Competitive pressures are increasing for Keytruda, particularly from new dual PD-1/VEGF inhibitors that may challenge its market position [20][21] - Merck's reliance on Keytruda raises concerns about its ability to diversify its product lineup and grow its non-oncology business ahead of the LOE period [19][30] Group 4: Financial Outlook and Valuation - Merck's shares are currently trading at a price/earnings ratio of 8.95, which is lower than the industry average of 14.78 [21] - Earnings estimates for 2025 have slightly increased, while those for 2026 have decreased, indicating mixed market sentiment [23] - A new multi-year optimization initiative aims to save $3 billion in annual costs by the end of 2027, which may help mitigate revenue gaps from Keytruda's LOE [29][30]