A hot deal may be brewing. 

Shares of health insurer Aetna (AET) spiked right before the closing bell Thursday following reports that the company was in talks to be acquired by CVS Health Corp. (CVS) - Get Report

Sources told the Wall Street Journal that CVS will offer $200 per share for the company which has an estimated value of $53 billion. 

Aetna shares closed the day up 12.72% to $180.48. If the acquisition price is accurate, that would mean CVS' offer represents a 20% premium over the stock's previous closing price. 

Shares of fellow insurer Molina Healthcare Inc. (MOH) - Get Report spiked shortly after the news broke but still closed the day on a down note, falling 1.65%. Tenet Healthcare (THC) - Get Report shares closed the day down double digits on reports that the company scrapped plans for its own sale. 

CVS is already currently in the midst of a 12-year year deal signed in 2010 to jointly provide pharmacy benefits management services. CVS manages purchasing, inventory management and prescription fulfillment for Aetna's mail-order and specialty pharmacy operations, per the terms of the agreement. 

CVS shares also got a bump after the news broke close to the closing bell, but the stock still fell nearly 3% Thursday. 

Wonder how Target (TGT) - Get Report feels right now -- it has CVS pharmacies inside its stores. 

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