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Filing Details

Issuer

Cik	Name	Symbol	Sector (SIC)	IRS No
311094	Westamerica Bancorporation	WABC	National Commercial Banks (6021)	942156203

Insiders

Cik	Name	Reported Address	Insider Title	Director	Officer	Large Shareholder	Other
1201513	L David Payne	Westamerica Bancorporation 4550 Mangels Blvd. Fairfield CA 94534	Chairman, President & Ceo	Yes	Yes	No	No

Reported Non-Derivative Transactions

Sec. Name	Acquisiton - Disposition	Date	Amount	Price	Remaning Holdings	Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
Common Stock	Acquisiton	2011-10-26	28,206	$38.74	365,185	No	4	M	Indirect	By Trust
Common Stock	Disposition	2011-10-26	28,206	$43.43	336,979	No	4	S	Indirect	By Trust
Common Stock	Acquisiton	2011-10-27	62,631	$38.74	399,610	No	4	M	Indirect	By Trust
Common Stock	Disposition	2011-10-27	900	$44.25	398,710	No	4	S	Indirect	By Trust
Common Stock	Disposition	2011-10-27	36,188	$45.17	362,522	No	4	S	Indirect	By Trust
Common Stock	Disposition	2011-10-27	25,543	$46.05	336,979	No	4	S	Indirect	By Trust
Common Stock	Acquisiton	2011-10-27	8,829	$38.74	345,808	No	4	M	Indirect	By Trust

Equity Swap Involved	Form Type	Code	Nature of Ownership	Explanation
No	4	M	Indirect	By Trust
No	4	S	Indirect	By Trust
No	4	M	Indirect	By Trust
No	4	S	Indirect	By Trust
No	4	S	Indirect	By Trust
No	4	S	Indirect	By Trust
No	4	M	Indirect	By Trust

Reported Derivative Transactions

Sec. Name	Sec. Type	Acquisiton - Disposition	Date	Amount	Price	Amount - 2	Price - 2
Common Stock	Non-qualified Stock Option (Right to Buy)	Disposition	2011-10-26	28,206	$0.00	28,206	$38.74
Common Stock	Non-qualified Stock Option (Right to Buy)	Disposition	2011-10-27	62,631	$0.00	62,631	$38.74
Common Stock	Non-qualified Stock Option (Right to Buy)	Disposition	2011-10-27	8,829	$0.00	8,829	$38.74

Remaning Holdings	Exercise Date	Expiration Date	Equity Swap Involved	Transaction Form Type	Transaction Code	Nature of Ownership
71,460	2003-01-23	2012-01-23	No	4	M	Direct
8,829	2003-01-23	2012-01-23	No	4	M	Direct
0	2003-01-23	2012-01-23	No	4	M	Direct

Reported Non-Derivative Holdings

Sec. Name	Remaning Holdings	Nature of Ownership	Explanation
Common Stock	528,837	Indirect	By Gibson Radio & Publishing Company
Common Stock	462	Indirect	By Son
Common Stock	10,925	Indirect	Esop

Footnotes

This is a weighted average price of multiple transactions for the same option. The price ranges from $43.00 to $43.78.
This is a weighted average price of multiple transactions for the same option. The price ranges from $43.67 to $44.63.
This is a weighted average price of multiple transactions for the same option. The price ranges from $44.71 to $45.70.
This is a weighted average price of multiple transactions for the same option. The price ranges from $45.71 to $46.57.
The reporting person is President and CEO of Gibson Radio and Publishing Company and disclaims beneficial ownership of 528,837 shares.