Will MRK's Growing Pipeline Help Navigate the Looming Keytruda LOE?

Core Insights - Merck has developed a significant portfolio of new products and pipeline candidates in oncology, vaccines, neuroscience, and infectious diseases, with plans to launch around 20 new vaccines and drugs in the coming years, many of which have blockbuster potential [1][9] Pipeline Development - Merck's phase III pipeline has nearly tripled since 2021, driven by in-house progress and M&A activities [1][9] - Promising late-stage candidates include enlicitide decanoate/MK-0616 for hypercholesterolemia, tulisokibart for ulcerative colitis, and bomedemstat/MK-3543 for essential thrombocythemia, myelofibrosis, and polycythemia vera [2] - Merck is co-developing three DXd antibody-drug conjugates (ADCs) with Daiichi Sankyo for various cancer indications [3] Market Expansion - Merck has in-licensed global rights to HS-10535, an investigational oral GLP-1 receptor agonist, to enter the obesity market [3] - The company is also focusing on its new 21-valent pneumococcal conjugate vaccine, Capvaxive, and pulmonary arterial hypertension drug, Winrevair, to enhance revenue as Keytruda approaches patent expiration [5][9] Keytruda and Competitive Landscape - Keytruda, a PD-L1 inhibitor, generated $7.21 billion in sales in Q1 2025, reflecting a 6% year-over-year increase, with a projected CAGR of 5.4% over the next three years [6] - Keytruda faces competition from other PD-L1 inhibitors such as Opdivo, Tecentriq, and Imfinzi, which have also shown strong sales growth [7][8][10] Financial Performance - Year-to-date, Merck's shares have decreased by 19.9%, compared to a 1.8% decline in the industry [11] - Merck's price/earnings ratio stands at 8.56, which is lower than the industry average of 14.92 and its 5-year mean of 12.85, indicating attractive valuation [12] - The Zacks Consensus Estimate for 2025 earnings has slightly declined from $8.94 to $8.92 per share over the past 60 days [13]