WABC Westamerica Bancorporation

AMENDMENT TO THE PROXY STATEMENT

FOR THE 2022 ANNUAL MEETING OF SHAREHOLDERS

TO BE HELD ON APRIL 28, 2022

On March 18, 2022, Westamerica Bancorporation filed with the Securities and Exchange Commission its definitive proxy statement for the 2022 Annual Meeting of Shareholders to be held on April 28, 2022 (the "Proxy Statement"). We are amending the Proxy Statement in order to correct the amount of 2021 Non-Stock Incentive Plan Compensation and total compensation for our Chairman, President and Chief Executive Officer and total compensation for other executive officers for 2019 and 2020, which were incorrectly stated in the Summary Compensation Table, and to correct the calculation of the Chief Executive Officer Pay Ratio resulting from such changes.

No other changes have been made to the Proxy Statement, and this Amendment has not been updated to reflect events occurring subsequent to the filing of the Proxy Statement. Capitalized terms used in this Amendment and not otherwise defined have the meaning given to such terms in the Proxy Statement.

The Proxy Statement contains important information, and this Amendment and the information set forth below should be read in conjunction with the Proxy Statement.

CHANGES TO PROXY STATEMENT

The subsections titled “Summary Compensation” and “Pay Ratio Disclosure” beginning on pages 26 and 27, respectively, of the Proxy Statement are amended in their entirety as follows:

Summary Compensation

The following table sets forth summary compensation information for the chief executive officer, chief financial officer and each of the other three most highly compensated executive officers for the fiscal years ending December 31, 2021, 2020, and 2019. These persons are referred to as named executive officers elsewhere in this Proxy Statement.

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⁽¹⁾ Stock Awards represent RPS shares as described in the Compensation Discussion & Analysis. The amounts shown represent the aggregate grant date fair market value computed in accordance with FASB ASC Topic 718. For further information, see Note 1 to the Company's audited financial statements for the year ended December 31, 2021 included in the Company's Annual Report on Form 10-K.

⁽²⁾ Option awards represent Nonqualified Stock Options as described in the Compensation Discussion & Analysis. The amounts shown represent the aggregate grant date fair market value computed in accordance with FASB ASC Topic 718. For further information, see Note 1 to the Company's audited financial statements for the year ended December 31, 2021 included in the Company's Annual Report on Form 10-K.

⁽³⁾ The amounts shown are non-equity incentive compensation only. No interest or other form of earnings was paid on the compensation.

⁽⁴⁾ The amounts include interest paid on deferred cash compensation to the extent the interest exceeds 120% of the long-term Applicable Federal Rates with compounding. The Company has no defined benefit pension plan. Mr. Payne has a pension agreement, which is discussed under “Pension Benefits for Fiscal Year 2021.”

⁽⁵⁾ Each of the above-named executive officers received less than $10,000 of aggregate perquisites and personal benefits, except for Mr. Donohoe who received a car allowance of $12,000. All other compensation includes Company contributions to defined contribution plans (ESOP and Deferred Profit Sharing), and amounts added to taxable wages using IRS tables for the cost of providing group term life insurance coverage that is more than the cost of $50,000 of coverage. It also includes the dollar value of the benefit to Mr. Payne for the portion of the premium payable by the Company with respect to a split dollar life insurance policy (projected on an actuarial basis), and a bonus paid to Mr. Payne in the amount of his portion of the split dollar life insurance premium.

Based on the compensation disclosed in the Summary Compensation Table, approximately 35% of total compensation comes from base salaries. See Compensation Discussion and Analysis for more details.

Pay Ratio Disclosure. In August 2015 pursuant to a mandate of the Dodd-Frank Wall Street Reform and Consumer Protection Act, the Securities and Exchange Commission adopted a rule requiring annual disclosure of the ratio of the median employee’s annual total compensation to the total annual compensation of the principal executive officer (“PEO”). The Company’s PEO is Mr. Payne.

In determining the median employee total annual compensation, the Company prepared a census of all employees as of December 31, 2021, except the PEO, with compensation annualized for those employees hired in 2021. For simplicity, the value of benefits provided by the Company’s qualified retirement plans and welfare benefit plans were excluded from the determination of total annual compensation as all employees are offered the same benefit programs.

April 8, 2022