The top penny stock gainer of 2017 has skyrocketed 568.6% so far this year, delivering a handsome return to its investors.
That soaring stock is Marinus Pharmaceuticals Inc., and its story illustrates what's so attractive about penny stocks as investments.
But investors should remember that penny stocks are risky. While these stocks have huge profit potentials, they also tend to see big pullbacks after making large gains.
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