Merck & Co. (6MK.DE) Stock Analysis & Winston Score
Merck & Co. is a large American pharmaceutical company that discovers, makes, and sells prescription medicines, vaccines, and animal health products. Its biggest product is Keytruda, a cancer drug used to treat many types of tumors, which has become one of the best-selling medicines in the world. Merck sells to hospitals, doctors, pharmacies, and governments across the healthcare industry. Merck earns most of its revenue by selling branded prescription drugs directly to healthcare providers and through pharmacy benefit managers, with animal health products adding a smaller but steady income stream. The company operates in over 140 countries and generates roughly $60 billion in annual revenue, with its deep pipeline of drugs under development and strong patent protections acting as key competitive advantages. The biggest risk Merck faces is that Keytruda's core patents begin expiring around 2028, which could sharply reduce revenue unless new drugs in its pipeline successfully reach the market.
Winston Score: 42/100 — Average
Mixed quality — meaningful strengths and weaknesses.
- Quality: Good (15/30)
- Growth: Weak (4/20)
- Cash Flow: Exceptional (10/10)
- Stability: Good (5/10)
- Valuation: Good (5/10)
- Ownership: Weak (1/15)



