THORATEC CORP

CUSIP: 885175307 Class: COM NEW

STATE OF WISCONSIN INVESTMENT BOARD's Holding History (CIK: 0000854157)

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

Q4 2014
Shares 100,000 Value ($000) $3,246 Avg Close — Range —
Q3 2014
Shares 160,000 Value ($000) $4,277 Avg Close — Range —
Q1 2014
Shares 80,000 Value ($000) $2,865 Avg Close — Range —
Q4 2013
Shares 80,000 Value ($000) $2,928 Avg Close — Range —
Q3 2013
Shares 130,000 Value ($000) $4,848 Avg Close — Range —
Q2 2013
Shares 130,000 Value ($000) $4,070 Avg Close — Range —