THORATEC CORP

CUSIP: 885175307 Class: COM NEW

MASSACHUSETTS FINANCIAL SERVICES CO /MA/'s Holding History (CIK: 0000912938)

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

Q2 2015
Shares 228,833 Value ($000) $10,199,087 Avg Close — Range —
Q1 2015
Shares 450,821 Value ($000) $18,884,891 Avg Close — Range —
Q4 2014
Shares 880,173 Value ($000) $28,570,416 Avg Close — Range —
Q3 2014
Shares 1,028,451 Value ($000) $27,491 Avg Close — Range —