CVS Health Corp. (CVS) could announce an acquisition of Aetna Inc. (AET) as soon as Monday.

CVS is expected to pay more than $66 billion for the health care company, according to The Wall Street Journal. The deal will be comprised mainly of cash would value Aetna at between $200 & $205 a share.

Aetna's shares rose around 1% as speculation about the acquisition grew.

CVS and Aetna have not publicly commented.

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