THORATEC CORP

CUSIP: 885175307 Class: COM NEW

MARSHALL WACE, LLP's Holding History (CIK: 0001318757)

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

Q3 2015
Shares 45,599 Value ($000) $2,885 Avg Close — Range —
Q2 2015
Shares 69,923 Value ($000) $3,116 Avg Close — Range —
Q1 2015
Shares 15,084 Value ($000) $632 Avg Close — Range —
Q4 2014
Shares 26,122 Value ($000) $848 Avg Close — Range —