Shares of Humana Inc. rallied Monday, and Mizuho analyst Ann Hynes said she believes a buyout by Cigna Group is likely — it’s just a matter of timing. Hynes’ comment was in response to a Bloomberg report out late Friday that the companies had resumed merger talks after reports the companies ended talks late last year due to disagreements about price.

A merger between Cigna and Humana may be under consideration again. See how the health insurance companies' assets overlap and where they diverge.

Key developments since the talks between the healthcare insurers broke down last year mean a deal now looks more likely.