I would think State Farm would be most heavily exposed to the hurricane exposure. That said, hurricanes are cat losses and thus heavily reinsured. You wouldn't expect to see this manifest itself in a well risk managed book of business because it'd be shared across the industry. That said, I've never really watched cat-exposed insurers during a loss like that...so maybe I know nothing...
I guess I should qualify that with, when I have direct knowledge of things that affect the market (North Korea, tax reform fear, and the hurricane for three recent examples), I have a tendency to dismiss information as unimportant that the market reacts adversely to. So, when Galveston is under 14' of water, maybe it is a good time to be shorting insurers...