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.