Concerns that Hurricane Irma may cause record insured damage sent shares of AmTrust Financial Services Inc. (Nasdaq: AFSI) down 94 cents to close at $11.50, Aspen Insurance Holdings Ltd. (NYSE: AHL) plummeting $4.25 to close at $41.15, Everest Re Group Ltd. (NYSE: RE) crashing $17.19 to close at $231.19, Validus Holdings Ltd. (NYSE: VR) plunging $4.40 to close at $45.49, and XL Group Ltd. (NYSE: XL) tumbling $2.35 to close at $38.27.