The market is embracing the retail king again.Costco Wholesale (COST 1.21%) has outperformed the S&P 500 by a wide margin over a long period of time, but even some of the best stocks have off years, and Costco stock barely moved last year.However, the market seems to have remembered it now, and it's off to an incredible start in 2026, up 13% in January as of this writing.If you didn't manage to buy it on the low, is it too late to buy now? The evergreen membership modelCostco has a fee-based membership mode ...