Costco Wholesale, the second-largest retailer in the U.S. behind Walmart, is an anomaly in an age marked by turmoil and downsizing. Known for its $55-a-year membership fee and its massive, austere warehouses stocked floor to ceiling with indulgent portions of everything from tilapia to toilet paper, Costco has thrived over the last five years. While competitors lost customers to the Internet and weathered a wave of investor pessimism, Costco’s sales have grown 39 percent and its stock price has doubled since 2009. The hot streak continued through last year’s retirement of widely admired co-founder and Chief Executive Officer Jim Sinegal. The share price is up 30 percent under the leadership of its new, plain-spoken CEO, Craig Jelinek. Click to read more of my Bloomberg Businessweek cover story from June of 2013.