X0306 4 2017-10-26 0000311094 WESTAMERICA BANCORPORATION WABC 0001201514 SCHNECK JAMES J WESTAMERICA BANCORPORATION 4550 MANGELS BLVD. 94534 1 VP/General Auditor Common Stock 2017-10-26 4 M 0 6000 43.015 A 6025 D Common Stock 2017-10-26 4 S 0 6000 58.8582 D 25 D Common Stock 931.636 I ESOP Non-qualified Stock Option (Right to Buy) 43.015 2017-10-26 4 M 0 6000 0 D 2010-01-21 2019-01-21 Common Stock 6000 0 D This is a weighted average price of multiple transactions for the same option. The sale price ranges from $58.79 to $59.00. These options vest ratably over three years beginning one year from date of grant. /s/ James J. Schneck 2017-10-27