I imagine very few of them are profitable, but a number of them could turn profitable if they chose to slow growth.  Just like Amazon is still doing, most of these companies are going to be funneling all the cash they get back into the company to accelerate growth.  The question is how many are operating with negative margins that will never be positive (selling a dollar for 90 cents).  We’ll probably find out over the next couple years as more Unicorns die.