Merck & Co., Inc. has reported a strong financial performance with a market cap of $307.3 billion and a 23.5% increase in stock over the past three months, earning a 'Moderate Buy' consensus from analysts. However, the pharmaceutical company is bracing for the impact of Keytruda's patent expiration in December 2028, which currently generates over 50% of its sales. In response, Merck has restructured its operations into Oncology and Specialty/Pharma & Infectious Diseases, aiming to mitigate potential revenue declines of up to 50% and maintain a robust pipeline with over 30 active studies across various cancers.