X0306 4 2018-07-23 0000311094 WESTAMERICA BANCORPORATION WABC 0001201504 HANSEN DENNIS R WESTAMERICA BANCORPORATION 4550 MANGELS BLVD 94534 1 SVP/Systems & Operations Mgr. Common Stock 2018-07-23 4 M 0 16467 42.33 A 18787 D Common Stock 2018-07-23 4 S 0 16467 59.7147 D 2320 D Common Stock 14780 I Deferred Common Stock 30334.796 I Esop Non-qualified Stock Option (Right to Buy) 42.33 2018-07-23 4 M 0 16467 0 D 2017-01-28 2026-01-28 Common Stock 16467 8233 D This is an average price of multiple transactions for the same option ranging in price from $59.45 to $59.92. Options vest ratably over three years beginning one year from date of grant. /s/ Dennis R. Hansen 2018-07-24