THORATEC CORP

CUSIP: 885175307 Class: COM NEW

FIRST TRUST ADVISORS LP's Holding History (CIK: 0001125816)

Note: Option positions (PUT/CALL) are excluded.

Q4 2014
Shares 80,881 Value ($000) $2,625 Avg Close — Range —
Q3 2014
Shares 37,934 Value ($000) $1,014 Avg Close — Range —
Q2 2014
Shares 34,536 Value ($000) $1,204 Avg Close — Range —
Q4 2013
Shares 21,119 Value ($000) $773 Avg Close — Range —
Q2 2013
Shares 114,292 Value ($000) $3,578 Avg Close — Range —