VOLCANO CORPORATION

CUSIP: 928645100 Class: CMN

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

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

Q4 2014
Shares 14,847 Value ($000) $265 Avg Close — Range —
Q3 2014
Shares 17,064 Value ($000) $182 Avg Close — Range —
Q2 2014
Shares 10,076 Value ($000) $177 Avg Close — Range —
Q1 2014
Shares 17,228 Value ($000) $340 Avg Close — Range —
Q4 2013
Shares 17,392 Value ($000) $380 Avg Close — Range —
Q3 2013
Shares 15,014 Value ($000) $359 Avg Close — Range —
Q2 2013
Shares 15,998 Value ($000) $290 Avg Close — Range —