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                               September 14, 2023

       David Payne
       Chief Executive Officer
       Westamerica Bancorporation
       1108 Fifth Avenue
       San Rafael, California 94901

                                                        Re: Westamerica 
Bancorporation
                                                            Definitive Proxy 
Statement on Schedule 14A
                                                            Filed March 17, 
2023
                                                            File No. 001-09383

       Dear David Payne:

               We have limited our review of your most recent definitive proxy 
statement to those issues
       we have addressed in our comments. Please respond to these comments by 
confirming that you
       will revise your future proxy disclosures in accordance with the topics 
discussed below.

       Definitive Proxy Statement on Schedule 14A filed March 17, 2023

       Pay versus Performance, page 26

   1.                                                   Refer to the 
reconciliation tables in the footnotes to your pay versus performance table. It
                                                        is unclear what amounts 
are reflected in the rows titled "Year over year change in fair
                                                        value of outstanding 
and unvested equity awards" and "Year over year change of equity
                                                        awards granted in prior 
years that vested in the year." Specifically, equity awards granted
                                                        in prior years that 
remain unvested or that vest during the relevant year should be valued
                                                        as the difference 
between the fair value as of the end of the prior fiscal year and the end of
                                                        the fiscal year or the 
vesting date, not the "year over year" change in value. Please ensure
                                                        that your table 
headings reflect accurately the amounts used to calculate compensation
                                                        actually paid. Refer to 
Item 402(v)(2)(C)(iv) of Regulation S-K.
   2.                                                   It appears that you 
have failed to provide the relationship disclosures required by
                                                        Regulation S-K Item 
402(v)(5). Please provide this required disclosure in its entirety.
                                                        Although you may 
provide this information graphically, narratively, or a combination of
                                                        the two, this 
disclosure must be separate from the pay versus performance table required
                                                        by Regulation S-K Item 
402(v)(1) and must provide a clear description of each separate
                                                        relationship indicated 
in Regulation S-K Item 402(v)(5)(i)-(iv). Please note, it is not
                                                        sufficient to state 
that no relationship exists, even if a particular measure is not used in
                                                        setting compensation.
 David Payne
Westamerica Bancorporation
September 14, 2023
Page 2
3.       We note that you have included "Return on Equity" in your pay versus 
performance table
         as your Company-Selected Measure pursuant to Regulation S-K Item 
402(v)(2)(vi), but
         you have included "Return on Average Equity" in the Tabular List 
provided pursuant to
         Regulation S-K Item 402(v)(6). Please ensure your Company-Selected 
Measure is
         described correctly and included in the Tabular List.
       Please contact Jane Park at 202-551-7439 or Jennifer Zepralka at 
202-551-2243 with any
questions.



FirstName LastNameDavid Payne                               Sincerely,
Comapany NameWestamerica Bancorporation
                                                            Division of 
Corporation Finance
September 14, 2023 Page 2                                   Disclosure Review 
Program
FirstName LastName