Michael Nagle | Bloomberg | Getty Images
Pedestrians walk passed signage at Cigna headquarters in Bloomfield, Connecticut.
voted to approve the merger last month, despite opposition from activist investor Carl Icahn, who wrote an open letter urging shareholders to reject the deal.
The companies expect to close the deal by the end of 2018.
The Justice Department’s review of another major healthcare merger, CVS‘s proposed acquisition of Aetna, has taken longer because of potential divestitures but could conclude this month, a source familiar with the matter told Reuters on Monday.