(NewsNation) — Amazon is expanding further into health care.

The tech giant will acquire the primary care organization One Medical in a deal valued roughly at $3.9 billion, marking another expansion for the retailer into health care services.

One Medical, whose parent company is the San-Francisco-based 1Life Healthcare, Inc., is a membership-based service that offers virtual care as well as in-person visits. It also works with more than 8,000 companies to provide its health benefits to employees.

Its one of Amazon’s biggest acquisitions, following its $13.7 billion deal to buy Whole Foods in 2017 and its $8.5 billion purchase of Hollywood studio MGM, which closed earlier this year.