there is one solution. ban all shorting.
Quote from danshirley:
This trade can't be legit. If the sec doesn't get them something is seriously wrong.

Quote from xflat2186:
Sorry but you have no way of knowing whether or not the firm who did that risk reversal was long stock already. The prices and the time mean nothing, they may have been long stock from anytime in the past.
Quote from BattleTested:
You guys are really funny. Don't you realize that the only entity that would have sold that position is one of the option shops. You don't think that they scream bloody murder when they get taken like this? They almost always win these disputes too even when there is no proof of insider dealing so don't worry about it, you cant even get lucky against these guys.