I think PTK is a dangerous stock to be short, too many good things coming. Hopefully they will learn it soon enough.

investopedia

''If you can't see the amplified risk right now, let's make it obvious: when you buy a stock (or go long) you can lose only the money that you've invested. So, if you bought one BBB share at $25, the maximum you could lose is $25 because the stock cannot drop to less than $0. However, when you short sell, you can theoretically lose an infinite amount of money, because a stock's price can keep rising forever. So, for example, if you had a shortposition in BBB (or short sold it) and BBB ended up rising past $60 before you exited your position, you would lose $35 per share ($60-$25) - even more than the stock's original price.''