X0407 4 2023-06-15 0000311094 WESTAMERICA BANCORPORATION WABC 0001201513 PAYNE DAVID L WESTAMERICA BANCORPORATION 4550 MANGELS BLVD. FAIRFIELD CA 94534 1 1 Chairman, President & CEO 0 Common Stock 2023-06-15 5 W 0 E 342417 0 A 342417 I By Trust The reporting person and members of his immediate family are among the beneficiaries of the trust. The reporting person disclaims beneficial ownership of the shares held by the trust except to the extent of his pecuniary interest therein. /s/ David L. Payne 2023-06-20