SpiderRock Trading LLC - THORATEC CORP ownership

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THORATEC CORP's ticker is and the CUSIP is 88517530. A total of 1 filers reported holding THORATEC CORP in Q1 2015. The put-call ratio across all filers is - and the average weighting 0.0%.

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Quarter-by-quarter ownership
SpiderRock Trading LLC ownership history of THORATEC CORP
ValueSharesWeighting
Q4 2014$231,000
+72.4%
10,600
+116.3%
0.64%
+39.3%
Q3 2014$134,000
+1814.3%
4,900
+2350.0%
0.46%
+1110.5%
Q4 2013$7,000
+75.0%
200
+100.0%
0.04%
+58.3%
Q3 2013$4,000
-66.7%
100
-75.0%
0.02%
-74.2%
Q2 2013$12,000–400–0.09%–
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Other shareholders
THORATEC CORP shareholders Q1 2015
NameSharesValueWeighting ↓
SpiderRock Trading LLC 400$12,0000.09%
ARROWSTREET CAPITAL, LIMITED PARTNERSHIP 209,757$6,567,0000.05%
DEUTSCHE BANK AG\ 436,818$13,675,0000.01%
View complete list of THORATEC CORP shareholders