VOLTERRA SEMICONDUCTOR CORP

CUSIP: 928708106 Class: COM

RATIONAL ADVISORS LLC's Holding History (CIK: 0001143565)

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

Q1 2010
Shares 70,500 Value ($000) $1,770 Avg Close — Range —
Q4 2009
Shares 25,200 Value ($000) $482 Avg Close — Range —
Q3 2009
Shares 25,200 Value ($000) $463 Avg Close — Range —