share florida home insurers include heritage insurance hold tumble tuesday many extend losses late day hurricane irma appear set hit florida saturday cause investors brace losses hci group share post biggest-ever one-day percentage drop fall 20.0 percent 30.94 hit low level since november trade volume 11.6 time stock 10-day move average heritage share hit record low close 17.0 percent 9.35 trade volume 7.0 time stock 10-day move average universal insurance hold inc share tumble 14.6 percent big one-day percentage drop since november 2015. irma strengthen highly dangerous category storm wind 185 mph barrel toward caribbean southern unite state threaten deadly wind storm surge flood irma continue current path create significant insure damage say sandler neill analyst paul newsome quite easy wipe earn year share unite insurance hold fell 7.2 percent hit low point since february trade volume 8.1 time 10-day move average large insurance company broad geographic exposure also low tumble last week expectations massive losses hurricane harvey devastate part texas louisiana travelers co 3.7 percent percent drop last week progressive corp 3.4 percent fall 5.7 percent last week chubb ltd fell 2.6 percent another big hurricane year add another level financial losses even big company enormous capital base newsome say second hurricane strain system insurers hard time get enough people loss adjustments order settle claim quickly possible say florida insurers share tumble hurricane irma loom