(Bloomberg) -- Aetna Inc., the second-largest U.S. health insurer by market value, is closing in on an acquisition of Humana Inc. and could reach a deal as early as this weekend, several people with knowledge of the matter said.

Humana shares rose 8 percent to $198.99 at 1:47 p.m. in New York, the biggest intraday gain since May 29. Aetna shares rose 2.8 percent to $131.07.

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