VOLCANO CORPORATION

CUSIP: 928645100 Class: CMN

GROUP ONE TRADING, L.P.'s Holding History (CIK: 0000932540)

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

Q4 2014
Shares 1,133 Value ($000) $20 Avg Close — Range —
Q3 2014
Shares 778 Value ($000) $8 Avg Close — Range —
Q2 2014
Shares 3,057 Value ($000) $54 Avg Close — Range —
Q3 2013
Shares 7,393 Value ($000) $177 Avg Close — Range —
Q2 2013
Shares 10,425 Value ($000) $189 Avg Close — Range —