I don't know if that is possible. Lawyers look for people with a big position in the stock. They need to put a name on their file for the lawsuit, so it's likely a few #$%$ off longs.
But don't let the number of law firms coming out bother you. This is normal, and these law firms are all well-known names in this field. Ultimately, one case will go to court (if it ever does), so the lawyers will have to bring their cases together and make one file, which in all likelihood, ICON will settle before it even reaches the court. I believe 80% of cases are settled before court. If it goes to court, the worst case for ICON is to pay a fine or to pay something to shareholders, which if it does get to that point, the shareholders will not see any of the money. It will all go to the lawyers. So the longs or former longs who are going to these lawyers are wasting their times.
A company the size of ICON will shake it off easily. The ambulance-chaser lawyers, if they go anywhere, will combine into one file. They will most likely settle it before going to court (if it even gets to that stage). Even if they go to court, a small fine will be paid, and company carries on as usual.
So long as you believe the earnings and the amazing returns and business model are real, which I think they are, this business is going strong, and is being sold dirt cheap.