KEY POINTS
  • The U.S. Department of Justice has cleared Cigna's acquisition of Express Scripts, the companies announced in a statement Monday.
  • Shareholders voted to approve the merger last month, despite opposition from activist investor Carl Icahn.
  • The companies expect to close the deal by the end of 2018.
Pedestrians walk passed signage at Cigna headquarters in Bloomfield, Connecticut.

The U.S. Department of Justice has cleared Cigna's $52 billion acquisition of Express Scripts, the companies announced in a statement Monday.

In combining Cigna, a health insurer, and Express Scripts, a pharmacy benefit manager, the firms say they can improve care for patients and lower health-care costs. Their rivals are growing and pursuing deals of their own as the industry faces increasing costs and growing political pressure and braces for Amazon's entry.