CVS Health Corporation provides a broad range of healthcare services. Its foundation lies in retail pharmacy, with more than 9,000 stores concentrated mainly in the United States. CVS is also a leading pharmacy benefit manager through Caremark, handling roughly 2 billion adjusted claims each year. Through Aetna, it operates a major health insurance business serving around 27 million medical members. The addition of Oak Street Health expanded its presence in primary care, creating potential synergies across its existing operations.