A customer waits at the counter of a CVS Pharmacy store in Pasadena, U.S., May 2, 2016. REUTERS/Mario Anzuoni/File Photo

(Reuters) - Drug retailer CVS Health Corp CVS.N is in talks to buy health insurer Aetna Inc AET.N, the Wall Street Journal reported on Thursday, citing sources.

Aetna’s shares closed up 11.5 percent at $178.60, after hitting $184.98.

CVS Health’s stock closed down 2.9 percent at $73.31.

Aetna had a market cap of $53.2 billion as of Wednesday’s close, according to Thomson Reuters data.