About Merck & Co. Inc.
Merck is a biopharmaceutical company based in Rahway, New Jersey, that develops and sells prescription medicines, vaccines, biologic therapies, and animal health products. It reports two main segments: pharmaceutical, covering human medicines and vaccines, and animal health, covering veterinary products and services. Robert Davis serves as chairman and chief executive. The company has been in business for more than 130 years and reported roughly 75,000 employees at the end of 2025. Its prescription drug and vaccine business is its largest source of revenue.
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