In trading on Thursday, shares of Platinum Underwriters Holdings, Ltd. (PTP) crossed below their last reported book value — defined as common shareholder equity per share — of $60.87, changing hands as low as $59.52 per share. Platinum Underwriters Holdings, Ltd. shares are currently trading off about 2.5% on the day. The chart below shows the one year performance of PTP shares, versus its 50 and 200 day moving averages:

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Platinum Underwriters Holdings, Ltd. Moving Averages Chart

Looking at the chart above, PTP's low point in its 52 week range is $45.17 per share, with $63.60 as the 52 week high point — that compares with a last trade of $59.74.

According to the ETF Finder at ETF Channel, PTP makes up 2.69% of the KBW Property & Casualty Insurance Portfolio ETF ( KBWP) which is trading lower by about 0.4% on the day Thursday.