VOLTERRA SEMICONDUCTOR CORP

CUSIP: 928708106 Class: COM

PRINCIPAL FINANCIAL GROUP INC's Holding History (CIK: 0001126328)

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

Q3 2013
Shares 136,851 Value ($000) $3,148 Avg Close — Range —
Q2 2013
Shares 143,671 Value ($000) $2,028 Avg Close — Range —