Forget Costco: This Stock Has Made Far More Millionaires

If you owned shares of Costco Wholesale (COST -0.86%) for any meaningful length of time since early last year, then congratulations! You logged some big gains, either realized or unrealized. Better yet, if you're a multidecade shareholder, this stock has likely become a massive -- and massively rewarding -- piece of your portfolio.There's another familiar name out there, however, that's quietly turned even more of its investors into millionaires. It's just done so for a slightly different but important reas ...