Actually, it is a lot. And it was the 30 put. More than 10% OTM with 1 day to expire on a stock trading in a small range all week. Buyer(s) never even attempted to post the minimum bid. That is not normal. Even a novice can see that these purchases were "highly likely" made with privileged information. We'll see what happens. If the organizations that now have the complaint are serious about maintaining the integrity and confidence in the markets, this will interest them.
Proving insider trading is very hard. Likely is that the buyers of those options will receive a letter and they will have to explain why they did what they did. From there it becomes difficult to prove they had inside information. Even if that is proven, it's unlikely you will get compensated as there is little way to verifiy who traded with whom.
It's also possible you traded against someone who are "following the crowd" on these and your specific executions were innocent even though someone with inside information might have triggered the subsequent purchases.
Given that only a few hundred traded, nothing will probably happen.
On a side note, why would a professional trader (whose been trading for 15 years) even bother selling 7 15 cent options? That's like $100 of potential pnl? And if you were doing that as part of your strategy (trading a diverse basket of names), wouldn't this situation come up realtively often - like once or twice a month?

