THORATEC CORP

CUSIP: 885175307 Class: COM NEW

GREAT WEST LIFE ASSURANCE CO /CAN/'s Holding History (CIK: 0001046192)

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

Q3 2015
Shares 5,537 Value ($000) $351 Avg Close — Range —
Q2 2015
Shares 24,637 Value ($000) $1,097 Avg Close — Range —
Q1 2015
Shares 25,337 Value ($000) $1,059 Avg Close — Range —
Q4 2014
Shares 25,337 Value ($000) $823 Avg Close — Range —
Q3 2014
Shares 25,337 Value ($000) $677 Avg Close — Range —
Q2 2014
Shares 22,137 Value ($000) $769 Avg Close — Range —
Q1 2014
Shares 4,037 Value ($000) $144 Avg Close — Range —
Q4 2013
Shares 4,037 Value ($000) $149 Avg Close — Range —
Q3 2013
Shares 27,437 Value ($000) $1,023 Avg Close — Range —
Q2 2013
Shares 69,400 Value ($000) $2,174 Avg Close — Range —