The executive credited with turning around the fortunes of Best Buy is turning over the reins to his young CFO.

The consumer electronics retailer on Monday said CEO Hubert Joly would step down - to be replaced by chief financial officer Corie Barry.

She's only 43, which would make her one of the only women and one of the youngest executives to lead a S&P 500 company.

Best Buy shares retreated at the market open Monday.

Perhaps some shareholders not ready to see Joly stepping aside.

Under his seven year reign, the company's shares quadrupled.

Many shoppers used to use Best Buy as a showroom and then order products off Amazon and other e-tailers.

Joly helped curb that by aggressively matching prices, expanding delivery options, and bolstering tech support services.

That enabled Best Buy to avoid the fate that sent other big-box chains like Toys "R" Us and Sports Authority to the graveyard.

Barry - whose been with Best Buy since 1999 - will step into the CEO job in June.