Robinhood is showing some huge gains before earnings.If you trade in the stock market -- and certainly, most of the people reading this article fit that description -- you surely know what Robinhood Markets (HOOD +5.59%) does. Robinhood is perhaps the most disruptive financial services company of our time, bringing commission-free trading to the masses with its easy-to-use mobile app.Robinhood is growing fast -- funded accounts are up 10% from a year ago, but the total platform assets exploded by 112%. Trad ...