Merck & Co., Inc. (MRK) vs Exxon Mobil Corporation (XOM)

Merck & Co., Inc. develops pharmaceutical products across multiple therapeutic areas, including cardiometabolic disorders, oncology, and infectious diseases. In cancer treatment, its immuno-oncology portfolio, led by Keytruda, represents a significant driver of total revenue. The company also maintains a strong vaccines business focused on preventing pediatric illnesses, alongside Gardasil for human papillomavirus. In addition, Merck markets animal health products. Geographically, 47% of the company’s sales come from its U.S. human health segment, which includes pharmaceuticals and vaccines.

Exxon Mobil Corporation is an integrated oil and gas company engaged in the global exploration, production, and refining of petroleum. In 2025, the company produced 3.3 million barrels of liquids per day and 8.4 billion cubic feet of natural gas daily. As of the end of 2025, ExxonMobil reported 19.3 billion barrels of oil equivalent in reserves, with liquids accounting for 69% of the total. The company is also among the world’s largest refiners, with total global refining capacity of 4.1 million barrels of oil per day, and ranks as a leading producer of both commodity and specialty chemicals.