Fitness-focused energy drink maker Celsius Holdings (CELH 2.18%) has created a fair number of millionaires in the last four years. The stock has gained 3,700% since taking its flagship beverage brand nationwide in March 2000.However, the number of Celsius millionaires is probably fairly small. The stock's trading volume rose relatively slowly and four years is a short millionaire-minting period. Moreover, Celsius is not among the 100 most owned stocks on the Robinhood Markets brokerage today -- and I can't ...