In trading on Thursday, shares of Thoratec Corp. ( THOR) crossed below their 200 day moving average of $35.46, changing hands as low as $35.33 per share. Thoratec Corp. shares are currently trading down about 2% on the day. The chart below shows the one year performance of THOR shares, versus its 200 day moving average:
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Looking at the chart above, THOR's low point in its 52 week range is $29.39 per share, with $39.86 as the 52 week high point — that compares with a last trade of $35.48. According to the ETF Finder at ETF Channel, THOR makes up 2.35% of the SPDR S&P Health Care Equipment ETF ( XHE) which is trading lower by about 0.2% on the day Thursday. 
