WESTAMERICA BANCORPORATION

Ticker: WABC CUSIP: 957090103 Class: Common Stock

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

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

Q1 2010
Shares 8,400 Value ($000) $484 Avg Close — Range —
Q4 2009
Shares 8,400 Value ($000) $465 Avg Close — Range —
Q3 2009
Shares 8,400 Value ($000) $437 Avg Close — Range —
Q2 2009
Shares 8,400 Value ($000) $417 Avg Close — Range —
Q1 2009
Shares 8,400 Value ($000) $383 Avg Close — Range —