WABC / Westamerica Bancorporation - Pengajuan SECLaporan Tahunan, Pernyataan Proksi

Westamerica Bancorporation
US ˙ NasdaqGS ˙ US9570901036

Mga Batayang Estadistika
CIK 311094
SEC Filings
All companies that sell securities in the United States must register with the Securities and Exchange Commission (SEC) and file reports on a regular basis. These reports include company annual reports (10K, 10Q), news updates (8K), investor presentations (found in 8Ks), insider trades (form 4), ownership reports (13D, and 13G), and reports related to the specific securities sold, such as registration statements and prospectus. This page shows recent SEC filings related to Westamerica Bancorporation
SEC Filings (Chronological Order)
Halaman ini menyediakan daftar lengkap dan kronologis dari Pengajuan SEC, tidak termasuk pengajuan kepemilikan yang kami sediakan di tempat lain.
August 12, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 12, 2025 Westamerica Banco

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 12, 2025 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Commi

August 6, 2025 EX-4.1

Westamerica Bancorporation 2025 Omnibus Equity Incentive Plan

EXHIBIT 4.1 WESTAMERICA BANCORPORATION 2025 OMNIBUS EQUITY INCENTIVE PLAN Section 1. Purpose of Plan. The name of the Plan is the Westamerica Bancorporation 2025 Omnibus Equity Incentive Plan. The purposes of the Plan are to (i) provide an additional incentive to selected employees, directors, and independent contractors of the Company or its Affiliates whose contributions are essential to the gro

August 6, 2025 EX-FILING FEES

Calculation of Fee Table

Calculation of Filing Fee Tables S-8 WESTAMERICA BANCORPORATION Table 1: Newly Registered Securities Security Type Security Class Title Fee Calculation Rule Amount Registered Proposed Maximum Offering Price Per Unit Maximum Aggregate Offering Price Fee Rate Amount of Registration Fee 1 Equity Common Stock, no par value Other 750,000 $ 47.

August 6, 2025 S-8

As filed with the Securities and Exchange Commission on August 6, 2025, Registration No. 333-______ UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM S-8 REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933 WESTAMERICA B

As filed with the Securities and Exchange Commission on August 6, 2025, Registration No.

August 6, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WESTAME

July 24, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 24, 2025 WESTAMERICA BANCORP

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 24, 2025 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commiss

July 24, 2025 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., July 24, 2025 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.46 per share on common stock outstanding to shareholders of record at the close of business August 4, 2025. The dividend is payable August 15, 2025. Chairman,

July 17, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 17, 2025 WESTAMERICA BANCORP

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 17, 2025 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commiss

July 17, 2025 EX-99.1

Westamerica Bancorporation Reports Second Quarter 2025 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Second Quarter 2025 Financial Results SAN RAFAEL, Calif., July 17, 2025 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the second quarter 2025 of $29.1 million and diluted earnings per common share ("EPS") of $1.12. Second quarter 2025 results compare to first quarter 2025 ne

June 27, 2025 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 or ☐ TRANSITION REPORT PURSUANT

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 A. Full title of the pl

May 9, 2025 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2025 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WESTAM

April 28, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 28, 2025 Westamerica Bancor

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 28, 2025 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Commis

April 24, 2025 EX-99.1

Westamerica Bancorporation Increases Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Increases Quarterly Cash Dividend SAN RAFAEL, Calif., April 24, 2025 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.46 per share, which represents a two cent per share increase from the prior quarter, on common stock outstanding to shareholders of record at the close of bu

April 24, 2025 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 24, 2025 WESTAMERICA BANCOR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 24, 2025 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commis

April 17, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 17, 2025 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commis

April 17, 2025 EX-99.1

Westamerica Bancorporation Reports First Quarter 2025 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports First Quarter 2025 Financial Results SAN RAFAEL, Calif., April 17, 2025 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the first quarter 2025 of $31.0 million and diluted earnings per common share ("EPS") of $1.16. First quarter 2025 results include a reversal of provision fo

March 14, 2025 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of The Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of The Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defin

March 14, 2025 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of The Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of The Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defin

February 28, 2025 EX-21

Subsidiaries of the registrant.

EXHIBIT 21 WESTAMERICA BANCORPORATION Subsidiaries as of December 31, 2024 State of Incorporation Westamerica Bank California Westamerica Mortgage Company — a subsidiary of Westamerica Bank California Community Banker Services Corporation — a subsidiary of Westamerica Bank California Weststar Mortgage Corporation — a subsidiary of Community Banker Services Corporation California Money Outlet, Inc.

February 28, 2025 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark one) ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to. Commission File Number: 001-09383 WESTAMERICA B

February 28, 2025 EX-19

Insider Trading and Company Stock Hedging Policy

EXHIBIT 19 WESTAMERICA BANCORPORATION Insider Trading and Company Stock Hedging Policy October 24, 2024 The Board of Directors and key employees regularly have access to comprehensive non-public financial information in the conduct of their assigned duties.

February 27, 2025 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): February 27, 2025 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Com

February 27, 2025 EX-99.1

Westamerica Bancorporation Announces Stock Repurchase Plan

EXHIBIT 99.1 Westamerica Bancorporation Announces Stock Repurchase Plan SAN RAFAEL, Calif., Feb. 27, 2025 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today approved a plan to repurchase, as conditions warrant, up to 2,000,000 shares of the Company’s common stock on the open market or in privately negotiated transactions prior to March 31, 2026. The repurc

January 23, 2025 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., Jan. 23, 2025 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.44 per share on common stock outstanding to shareholders of record at the close of business February 3, 2025. The dividend is payable February 14, 2025. Chairm

January 23, 2025 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 23, 2025 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

January 23, 2025 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): January 23, 2025 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Comm

January 16, 2025 EX-99.1

Westamerica Bancorporation Reports Fourth Quarter 2024 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Fourth Quarter 2024 Financial Results SAN RAFAEL, Calif., Jan. 16, 2025 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the fourth quarter 2024 of $31.7 million and diluted earnings per common share ("EPS") of $1.19. Fourth quarter 2024 results include an increase to the book

January 16, 2025 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 16, 2025 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

November 8, 2024 SC 13G/A

WABC / Westamerica Bancorporation / AMERICAN CENTURY INVESTMENT MANAGEMENT INC - SC 13G Passive Investment

SC 13G/A 1 westamericabancorp13g-a1.htm SC 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1) * WESTAMERICA BANCORPORATION (Name of Issuer) COMMON STOCK (Title of Class of Securities) 957090103 (CUSIP Number) SEPTEMBER 30, 2024 (Date of Event Which Requires Filing of this Statement) Check the appropri

November 8, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WE

October 24, 2024 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., Oct. 24, 2024 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.44 per share on common stock outstanding to shareholders of record at the close of business November 4, 2024. The dividend is payable November 15, 2024. Chairm

October 24, 2024 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 24, 2024 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

October 17, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 17, 2024 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

October 17, 2024 EX-99.1

Westamerica Bancorporation Reports Third Quarter 2024 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Third Quarter 2024 Financial Results SAN RAFAEL, Calif., Oct. 17, 2024 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the third quarter 2024 of $35.1 million and diluted earnings per common share ("EPS") of $1.31, which includes gains from life insurance and sales of other as

August 8, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WESTAME

July 25, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 25, 2024 WESTAMERICA BANCORP

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 25, 2024 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commiss

July 25, 2024 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., July 25, 2024 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.44 per share on common stock outstanding to shareholders of record at the close of business August 5, 2024. The dividend is payable August 16, 2024. Chairman,

July 18, 2024 EX-99.1

Westamerica Bancorporation Reports Second Quarter 2024 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Second Quarter 2024 Financial Results SAN RAFAEL, Calif., July 18, 2024 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the second quarter 2024 of $35.5 million and diluted earnings per common share ("EPS") of $1.33. Second quarter 2024 results compare to first quarter 2024 ne

July 18, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 18, 2024 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commiss

June 28, 2024 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 28, 2024 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Commiss

June 28, 2024 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) ☒ ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 A. Full title of the pl

May 9, 2024 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2024 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WESTAM

May 6, 2024 8-K/A

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K/A CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): May 6, 2024 (April 26, 2024) Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorp

April 29, 2024 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 26, 2024 Westamerica Bancor

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 26, 2024 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Commis

April 25, 2024 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., April 25, 2024 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.44 per share on common stock outstanding to shareholders of record at the close of business May 6, 2024. The dividend is payable May 17, 2024. Chairman, Presi

April 25, 2024 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 25, 2024 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commis

April 18, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 18, 2024 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commis

April 18, 2024 EX-99.1

Westamerica Bancorporation Reports First Quarter 2024 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports First Quarter 2024 Financial Results SAN RAFAEL, Calif., April 18, 2024 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the first quarter 2024 of $36.4 million and diluted earnings per common share ("EPS") of $1.37. First quarter 2024 results compare to fourth quarter 2023 net

March 15, 2024 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of The Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of The Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defin

March 15, 2024 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of The Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of The Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defin

February 29, 2024 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark one) ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to. Commission File Number: 001-09383 WESTAMERICA B

February 29, 2024 EX-97

Incentive-Based Compensation Recovery Policy

EXHIBIT 97 Westamerica Bancorporation Incentive-Based Compensation Recovery Policy Implementation October 26, 2023 Purpose This Incentive Compensation Recovery Policy (“Policy”) adopts the Securities and Exchange Commission’s (“SEC”) compensation clawback rules1 and the related listing standards of the National Association of Securities Dealers Automated Quotations Stock Market (“NASDAQ”).

February 29, 2024 EX-21

Subsidiaries of the registrant.

EXHIBIT 21 WESTAMERICA BANCORPORATION Subsidiaries as of December 31, 2023 State of Incorporation Westamerica Bank California Westamerica Mortgage Company — a subsidiary of Westamerica Bank California Community Banker Services Corporation — a subsidiary of Westamerica Bank California Weststar Mortgage Corporation — a subsidiary of Community Banker Services Corporation California Money Outlet, Inc.

February 13, 2024 SC 13G/A

WABC / Westamerica Bancorporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 14)* Name of issuer: Westamerica BanCorp Title of Class of Securities: Common Stock CUSIP Number: 957090103 Date of Event Which Requires Filing of this Statement: December 29, 2023 Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

February 12, 2024 SC 13G

WABC / Westamerica Bancorporation / AMERICAN CENTURY INVESTMENT MANAGEMENT INC - SC 13G Passive Investment

SC 13G 1 westamericabancorp13g.htm SC 13G UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. ) * WESTAMERICA BANCORPORATION (Name of Issuer) COMMON STOCK (Title of Class of Securities) 957090103 (CUSIP Number) DECEMBER 31, 2023 (Date of Event Which Requires Filing of this Statement) Check the appropriate box

January 25, 2024 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 25, 2024 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

January 25, 2024 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., Jan. 25, 2024 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.44 per share on common stock outstanding to shareholders of record at the close of business February 5, 2024. The dividend is payable February 16, 2024. Chairm

January 18, 2024 EX-99.1

Westamerica Bancorporation Reports Fourth Quarter 2023 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Fourth Quarter 2023 Financial Results SAN RAFAEL, Calif., Jan. 18, 2024 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the fourth quarter 2023 of $39.5 million and diluted earnings per common share ("EPS") of $1.48. Fourth quarter 2023 results include an increase to the book

January 18, 2024 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 18, 2024 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

December 19, 2023 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 19, 2023 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Com

November 8, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WE

November 1, 2023 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 1, 2023 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Comm

October 26, 2023 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 26, 2023 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

October 26, 2023 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., Oct. 26, 2023 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.44 per share on common stock outstanding to shareholders of record at the close of business November 6, 2023. The dividend is payable November 17, 2023. Chairm

October 19, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 19, 2023 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

October 19, 2023 EX-99.1

Westamerica Bancorporation Reports Third Quarter 2023 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Third Quarter 2023 Financial Results SAN RAFAEL, Calif., Oct. 19, 2023 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the third quarter 2023 of $41.6 million and diluted earnings per common share (“EPS”) of $1.56, which represent the highest third quarter results in Company h

September 29, 2023 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): September 29, 2023 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Co

September 21, 2023 CORRESP

September 21, 2023

September 21, 2023 VIA EDGAR Jane Park Jennifer Zepralka Disclosure Review Program Division of Corporation Finance U.

August 8, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WESTAME

July 27, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 27, 2023 WESTAMERICA BANCORP

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 27, 2023 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commiss

July 27, 2023 EX-99.1

Westamerica Bancorporation Increases Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Increases Quarterly Cash Dividend SAN RAFAEL, Calif., July 27, 2023 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.44 per share on common stock outstanding to shareholders of record at the close of business August 7, 2023. The dividend is payable August 18, 2023. Chairman,

July 20, 2023 EX-99.1

Westamerica Bancorporation Reports Second Quarter 2023 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Second Quarter 2023 Financial Results SAN RAFAEL, Calif., July 20, 2023 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the second quarter 2023 of $40.2 million and diluted earnings per common share ("EPS") of $1.51, which represents the highest second quarter results in Compa

July 20, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 20, 2023 WESTAMERICA BANCORP

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 20, 2023 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commiss

June 29, 2023 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) ☑ ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 or ☐ TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 A. Full title of the pl

June 2, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 2, 2023 Westamerica Bancorpo

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 2, 2023 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Commissi

May 9, 2023 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2023 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WESTAM

April 28, 2023 EX-3.1

Amended and Restated Bylaws of Westamerica Bancorporation dated April 27, 2023.

Exhibit 3.1 BYLAWS OF WESTAMERICA BANCORPORATION ARTICLE I OFFICES Section 1.01. Principal Offices. The principal executive office of the corporation shall be located at 1108 Fifth Avenue, San Rafael, California, or such other place within or outside the State of California as shall be fixed by the board of directors. If the principal executive office is located outside this state, and the corpora

April 28, 2023 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 28, 2023 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Commis

April 27, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 27, 2023 WESTAMERICA BANCOR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 27, 2023 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commis

April 27, 2023 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., April 27, 2023 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.42 per share on common stock outstanding to shareholders of record at the close of business May 8, 2023. The dividend is payable May 19, 2023. Chairman, Presi

April 20, 2023 EX-99.1

Westamerica Bancorporation Reports First Quarter 2023 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports First Quarter 2023 Financial Results SAN RAFAEL, Calif., April 20, 2023 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the first quarter 2023 of $40.5 million and diluted earnings per common share ("EPS") of $1.51. First quarter 2023 results include a provision for credit los

April 20, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 20, 2023 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commis

March 31, 2023 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 31, 2023 WESTAMERICA BANCOR

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): March 31, 2023 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commis

March 17, 2023 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of The Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of The Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☐ Defin

March 17, 2023 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of The Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of The Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ☒ Defin

March 1, 2023 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark one) ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2022 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to. Commission File Number: 001-09383 WESTAMERICA B

March 1, 2023 EX-21

Subsidiaries of the registrant.

EXHIBIT 21 WESTAMERICA BANCORPORATION Subsidiaries as of December 31, 2022 State of Incorporation Westamerica Bank California Westamerica Mortgage Company — a subsidiary of Westamerica Bank California Community Banker Services Corporation — a subsidiary of Westamerica Bank California Weststar Mortgage Corporation — a subsidiary of Community Banker Services Corporation California Money Outlet, Inc.

February 9, 2023 SC 13G/A

WABC / Westamerica Bancorporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SC 13G/A 1 tv02242-westamericabancorp.htm SCHEDULE 13G/A SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 13)* Name of issuer: Westamerica BanCorp Title of Class of Securities: Common Stock CUSIP Number: 957090103 Date of Event Which Requires Filing of this Statement: December 30, 2022 Check the appropriate box to desi

February 8, 2023 SC 13G/A

WABC / Westamerica Bancorporation / AMERICAN CENTURY INVESTMENT MANAGEMENT INC - SC 13G/A Passive Investment

SC 13G/A 1 westamericabancorp13g-a2.htm SC 13G/A United States Securities and Exchange Commission Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 2)* WESTAMERICA BANCORPORATION (Name of Issuer) COMMON STOCK (Title of Class of Securities) 957090103 (CUSIP Number) DECEMBER 31, 2022 (Date of Event Which Requires Filing of this Statement) Check the appropri

January 26, 2023 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., Jan. 26, 2023 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.42 per share on common stock outstanding to shareholders of record at the close of business February 6, 2023. The dividend is payable February 17, 2023. Chairm

January 26, 2023 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 26, 2023 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

January 19, 2023 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 19, 2023 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

January 19, 2023 EX-99.1

Westamerica Bancorporation Reports Fourth Quarter 2022 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Fourth Quarter 2022 Financial Results SAN RAFAEL, Calif., Jan. 19, 2023 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the fourth quarter 2022 of $39.3 million and diluted earnings per common share ("EPS") of $1.46. Fourth quarter 2022 results compare to net income for third

November 8, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2022 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WE

October 27, 2022 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., Oct. 27, 2022 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.42 per share on common stock outstanding to shareholders of record at the close of business November 7, 2022. The dividend is payable November 18, 2022. Chairm

October 27, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 27, 2022 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

October 20, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 20, 2022 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

October 20, 2022 EX-99.1

Westamerica Bancorporation Reports Third Quarter 2022 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Third Quarter 2022 Financial Results SAN RAFAEL, Calif., Oct. 20, 2022 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the third quarter 2022 of $34.8 million and diluted earnings per common share ("EPS") of $1.29, including a life insurance gain equivalent to EPS of $0.03. Th

August 8, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2022 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WESTAME

July 28, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 28, 2022 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commiss

July 28, 2022 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend and Announces Stock Repurchase Plan

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend and Announces Stock Repurchase Plan SAN RAFAEL, Calif., July 28, 2022 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.42 per share on common stock outstanding to shareholders of record at the close of business August 8, 2022. The dividend is

July 21, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 21, 2022 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commiss

July 21, 2022 EX-99.1

Westamerica Bancorporation Reports Second Quarter 2022 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Second Quarter 2022 Financial Results SAN RAFAEL, Calif., July 21, 2022 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the second quarter 2022 of $25.3 million and diluted earnings per common share (?EPS?) of $0.94. Second quarter 2022 results compare to net income of $22.6 m

June 29, 2022 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

11-K 1 f11k062822.htm FORM 11-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) ☑ ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 or ☐ TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 0

May 9, 2022 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2022 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WESTAM

April 29, 2022 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 29, 2022 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Commis

April 28, 2022 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., April 28, 2022 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.42 per share on common stock outstanding to shareholders of record at the close of business May 9, 2022. The dividend is payable May 20, 2022. Chairman, Presi

April 28, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 28, 2022 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commis

April 21, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 21, 2022 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commis

April 21, 2022 EX-99.1

Westamerica Bancorporation Reports First Quarter 2022 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports First Quarter 2022 Financial Results SAN RAFAEL, Calif., April 21, 2022 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the first quarter 2022 of $22.6 million and diluted earnings per common share ("EPS") of $0.84. First quarter 2022 results compare to net income of $21.7 mil

April 8, 2022 DEFR14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of The Securities Exchange Act of 1934 (Amendment No. 1)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of The Securities Exchange Act of 1934 (Amendment No. 1) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defi

March 18, 2022 DEF 14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of The Securities Exchange Act of 1934 (Amendment No. )

DEF 14A 1 def14a-27566wabc.htm DEF 14A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of The Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ☒ Filed by a Party other than the Registrant ☐ Check the appropriate box: ☐ Preliminary Proxy Statement ☐ Confidential, for Use of the Commission Only (as

March 18, 2022 DEFA14A

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of The Securities Exchange Act of 1934 (Amendment No. )

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 14A Proxy Statement Pursuant to Section 14(a) of The Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant ? Filed by a Party other than the Registrant ? Check the appropriate box: ? Preliminary Proxy Statement ? Confidential, for Use of the Commission Only (as permitted by Rule 14a-6(e)(2)) ? Defin

February 28, 2022 EX-21

Subsidiaries of the registrant.

EXHIBIT 21 WESTAMERICA BANCORPORATION Subsidiaries as of December 31, 2021 State of Incorporation Westamerica Bank California Westamerica Mortgage Company ? a subsidiary of Westamerica Bank California Community Banker Services Corporation ? a subsidiary of Westamerica Bank California Weststar Mortgage Corporation ? a subsidiary of Community Banker Services Corporation California Money Outlet, Inc.

February 28, 2022 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark one) ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to. Commission File Number: 001-09383 WESTAMERICA B

February 14, 2022 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): February 14, 2022 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Com

February 10, 2022 SC 13G/A

WABC / Westamerica Bancorporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 12)* Name of issuer: Westamerica BanCorp Title of Class of Securities: Common Stock CUSIP Number: 957090103 Date of Event Which Requires Filing of this Statement: December 31, 2021 Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

February 4, 2022 SC 13G/A

WABC / Westamerica Bancorporation / AMERICAN CENTURY INVESTMENT MANAGEMENT INC - SC 13G/A Passive Investment

United States Securities and Exchange Commission Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 1)* WESTAMERICA BANCORPORATION (Name of Issuer) COMMON STOCK (Title of Class of Securities) 957090103 (CUSIP Number) DECEMBER 31, 2021 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which t

January 27, 2022 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 27, 2022 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

January 27, 2022 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., Jan. 27, 2022 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.42 per share on common stock outstanding to shareholders of record at the close of business February 7, 2022. The dividend is payable February 18, 2022. Chairm

January 20, 2022 EX-99.1

Westamerica Bancorporation Reports Fourth Quarter 2021 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Fourth Quarter 2021 Financial Results SAN RAFAEL, Calif., Jan. 20, 2022 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the fourth quarter 2021 of $21.7 million and diluted earnings per common share ("EPS") of $0.81. Fourth quarter 2021 results compare to net income of $22.1 m

January 20, 2022 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 20, 2022 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

November 3, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WE

November 1, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): November 1, 2021 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Comm

October 28, 2021 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 28, 2021 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

October 28, 2021 EX-99.1

Westamerica Bancorporation Increases Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Increases Quarterly Cash Dividend SAN RAFAEL, Calif., Oct. 28, 2021 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.42 per share on common stock outstanding to shareholders of record at the close of business November 8, 2021. The dividend is payable November 19, 2021. Chair

October 21, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 21, 2021 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

October 21, 2021 EX-99.1

Westamerica Bancorporation Reports Third Quarter 2021 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Third Quarter 2021 Financial Results SAN RAFAEL, Calif., Oct. 21, 2021 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the third quarter 2021 of $22.1 million and diluted earnings per common share ("EPS") of $0.82. Third quarter 2021 results include ?make-whole? interest incom

August 9, 2021 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): August 9, 2021 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Commis

August 4, 2021 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WESTAME

July 23, 2021 EX-99.1

Westamerica Bancorporation Announces Stock Repurchase Plan

EXHIBIT 99.1 Westamerica Bancorporation Announces Stock Repurchase Plan SAN RAFAEL, Calif., July 22, 2021 (GLOBE NEWSWIRE) - Westamerica Bancorporation?s Board of Directors approved a plan to repurchase, as conditions warrant, up to 1,750,000 shares of the Company?s common stock on the open market or in privately negotiated transactions prior to September 1, 2022. The repurchase plan represents ap

July 23, 2021 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 22, 2021 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commiss

July 22, 2021 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 22, 2021 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commiss

July 22, 2021 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., July 22, 2021 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.41 per share on common stock outstanding to shareholders of record at the close of business August 2, 2021. The dividend is payable August 13, 2021. Chairman,

July 15, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 15, 2021 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commiss

July 15, 2021 EX-99.1

Westamerica Bancorporation Reports Second Quarter 2021 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Second Quarter 2021 Financial Results SAN RAFAEL, Calif., July 15, 2021 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the second quarter 2021 of $22.6 million and diluted earnings per common share ("EPS") of $0.84. Second quarter 2021 results include ?make-whole? interest in

June 28, 2021 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 11-K (Mark One) ? ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 or ? TRANSITION REPORT PURSUANT TO SECTION 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 A. Full title of the pl

May 5, 2021 10-Q

Quarterly Report - FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ? QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2021 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WESTAM

April 23, 2021 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 23, 2021 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Commis

April 22, 2021 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., April 22, 2021 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.41 per share on common stock outstanding to shareholders of record at the close of business May 3, 2021. The dividend is payable May 14, 2021. Chairman, Presi

April 22, 2021 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 22, 2021 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commis

April 15, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 15, 2021 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commis

April 15, 2021 EX-99.1

Westamerica Bancorporation Reports First Quarter 2021 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports First Quarter 2021 Financial Results SAN RAFAEL, Calif., April 15, 2021 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the first quarter 2021 of $20.1 million and diluted earnings per common share ("EPS") of $0.75. First quarter 2021 results include ?make-whole? interest inco

March 12, 2021 DEFA14A

- DEFA14A

DEFA14A 1 defa14a-50067wabc.htm DEFA14A SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No. ) Filed by the Registrant x Filed by a Party other than the Registrant ¨ Check the appropriate box: ¨ Preliminary Proxy Statement ¨ Soliciting Material Under Rule 14a-12 ¨

March 12, 2021 DEF 14A

- DEF 14A

SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

February 25, 2021 EX-21

Subsidiaries of the registrant.

EXHIBIT 21 WESTAMERICA BANCORPORATION Subsidiaries as of December 31, 2020 State of Incorporation Westamerica Bank California Westamerica Mortgage Company ? a subsidiary of Westamerica Bank California Community Banker Services Corporation ? a subsidiary of Westamerica Bank California Weststar Mortgage Corporation ? a subsidiary of Community Banker Services Corporation California Money Outlet, Inc.

February 25, 2021 10-K

Annual Report - FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark one) ? ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2020 or ? TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to. Commission File Number: 001-09383 WESTAMERICA B

February 11, 2021 SC 13G

United States Securities and Exchange Commission Washington, D.C. 20549

United States Securities and Exchange Commission Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. )* WESTAMERICA BANCORPORATION (Name of Issuer) COMMON STOCK (Title of Class of Securities) 957090103 (CUSIP Number) DECEMBER 31, 2020 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which th

February 10, 2021 SC 13G/A

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 11)*

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 11)* Name of issuer: Westamerica BanCorp Title of Class of Securities: Common Stock CUSIP Number: 957090103 Date of Event Which Requires Filing of this Statement: December 31, 2020 Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

January 28, 2021 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., Jan. 28, 2021 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.41 per share on common stock outstanding to shareholders of record at the close of business February 8, 2021. The dividend is payable February 19, 2021. Chairm

January 28, 2021 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 28, 2021 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

January 21, 2021 EX-99.1

Westamerica Bancorporation Reports Fourth Quarter 2020 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Fourth Quarter 2020 Financial Results SAN RAFAEL, Calif., Jan. 21, 2021 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the fourth quarter 2020 of $23.8 million and diluted earnings per common share ("EPS") of $0.89. Fourth quarter 2020 results include a gain on sale of a clos

January 21, 2021 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 21, 2021 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

November 5, 2020 10-Q

Quarterly Report - FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WE

October 22, 2020 8-K

Financial Statements and Exhibits, Other Events - FORM 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 22, 2020 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

October 22, 2020 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., Oct. 22, 2020 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.41 per share on common stock outstanding to shareholders of record at the close of business November 2, 2020. The dividend is payable November 13, 2020. Chairm

October 15, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition - FORM 8-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 15, 2020 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

October 15, 2020 EX-99.1

Westamerica Bancorporation Reports Third Quarter 2020 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Third Quarter 2020 Financial Results SAN RAFAEL, Calif., Oct. 15, 2020 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the third quarter 2020 of $20.1 million and diluted earnings per common share (“EPS”) of $0.74. These results compare to net income of $19.6 million and EPS o

August 5, 2020 10-Q

Quarterly Report - FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WESTAME

July 24, 2020 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 23, 2020 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commiss

July 24, 2020 EX-99.1

Westamerica Bancorporation Announces Stock Repurchase Plan

EXHIBIT 99.1 Westamerica Bancorporation Announces Stock Repurchase Plan SAN RAFAEL, Calif., July 23, 2020 (GLOBE NEWSWIRE) - Westamerica Bancorporation’s Board of Directors approved a plan to repurchase, as conditions warrant, up to 1,750,000 shares of the Company’s common stock on the open market or in privately negotiated transactions prior to September 1, 2021. The repurchase plan represents ap

July 23, 2020 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., July 23, 2020 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.41 per share on common stock outstanding to shareholders of record at the close of business August 3, 2020. The dividend is payable August 14, 2020. Chairman,

July 23, 2020 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 23, 2020 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commiss

July 16, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): July 16, 2020 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commiss

July 16, 2020 EX-99.1

Westamerica Bancorporation Reports Second Quarter 2020 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Second Quarter 2020 Financial Results SAN RAFAEL, Calif., July 16, 2020 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the second quarter 2020 of $19.6 million and diluted earnings per common share ("EPS") of $0.72. These results compare to net income of $17.0 million and EPS

June 26, 2020 11-K

- FORM 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K (Mark One) [X] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-09383 A. Full title of the pl

May 6, 2020 10-Q

Quarterly Report - FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2020 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WESTAM

April 24, 2020 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 24, 2020 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commis

April 23, 2020 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., April 23, 2020 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.41 per share on common stock outstanding to shareholders of record at the close of business May 4, 2020. The dividend is payable May 15, 2020. Chairman, Presi

April 23, 2020 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 23, 2020 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commis

April 16, 2020 EX-99.1

Westamerica Bancorporation Reports First Quarter 2020 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports First Quarter 2020 Financial Results SAN RAFAEL, Calif., April 16, 2020 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the first quarter 2020 of $17.0 million and diluted earnings per common share ("EPS") of $0.63. First quarter 2020 results include a provision for credit los

April 16, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): April 16, 2020 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commis

March 9, 2020 DEFA14A

WABC / Westamerica Bancorporation DEFA14A - - DEFA14A

SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 9, 2020 DEF 14A

WABC / Westamerica Bancorporation DEF 14A - - DEF 14A

SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

February 28, 2020 EX-21

Subsidiaries of the registrant.

EXHIBIT 21 WESTAMERICA BANCORPORATION Subsidiaries as of December 31, 2019 State of Incorporation Westamerica Bank California Westamerica Mortgage Company — a subsidiary of Westamerica Bank California Community Banker Services Corporation — a subsidiary of Westamerica Bank California Weststar Mortgage Corporation — a subsidiary of Community Banker Services Corporation California Money Outlet, Inc.

February 28, 2020 EX-4.1

Description of registered securities, incorporated by reference to Exhibit 4.1 to the Registrant’s Annual Report on Form 10-K for the fiscal year ended December 31, 2019, filed with the Securities and Exchange Commission on February 28, 2020.

EXHIBIT 4.1 DESCRIPTION OF SECURITIES OF WESTAMERICA BANCORPORATION REGISTERED UNDER SECTION 12 OF THE EXCHANGE ACT The authorized capital stock of Westamerica Bancorporation (the “Company”) consists of 150,000,000 shares of common stock, no par value per share; 1,000,000 shares of Class B Common Stock, no par value per share; and 1,000,000 undesignated shares of preferred stock, no par value per

February 28, 2020 10-K

Annual Report - FORM 10-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark one) ☑ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to. Commission File Number: 001-09383 WESTAMERICA B

February 12, 2020 SC 13G/A

WABC / Westamerica Bancorporation / VANGUARD GROUP INC - SCHEDULE 13G/A Passive Investment

SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 10)* Name of issuer: Westamerica Bancorporation Title of Class of Securities: Common Stock CUSIP Number: 957090103 Date of Event Which Requires Filing of this Statement: December 31, 2019 Check the appropriate box to designate the rule pursuant to which this Schedule is

February 11, 2020 SC 13G/A

WABC / Westamerica Bancorporation / AMERICAN CENTURY INVESTMENT MANAGEMENT INC - SC 13G/A Passive Investment

United States Securities and Exchange Commission Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 5)* WESTAMERICA BANCORPORATION (Name of Issuer) COMMON STOCK (Title of Class of Securities) 957090103 (CUSIP Number) DECEMBER 31, 2019 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which t

January 23, 2020 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., Jan. 23, 2020 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.41 per share on common stock outstanding to shareholders of record at the close of business February 3, 2020. The dividend is payable February 14, 2020. Chairm

January 23, 2020 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 23, 2020 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

January 16, 2020 EX-99.1

Westamerica Bancorporation Reports Fourth Quarter 2019 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Fourth Quarter 2019 Financial Results SAN RAFAEL, Calif., Jan. 16, 2020 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the fourth quarter 2019 of $20.7 million and diluted earnings per common share ("EPS") of $0.77. These results compare to net income of $20.4 million and EPS

January 16, 2020 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): January 16, 2020 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

December 31, 2019 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 31, 2019 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Com

December 20, 2019 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): December 20, 2019 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Com

November 4, 2019 EX-10.2

Westamerica Bancorporation 2019 Omnibus Equity Incentive Plan Restricted Stock Unit Award Agreement Form, incorporated by reference to Exhibit 10.2 to the Registrant’s Form 10-Q, filed with the Securities and Exchange Commission on November 4, 2019.

EXHIBIT 10.2 WESTAMERICA BANCORPORATION EMPLOYEE RESTRICTED STOCK UNIT AWARD GRANT NOTICE (2019 Omnibus Equity Incentive Plan) As a key leader in our business, you are in a position to have significant influence on the performance and success of Westamerica Bancorporation (the “Company”). I am pleased to inform you that, in recognition of the role you play in our collective success, you have been

November 4, 2019 10-Q

Quarterly Report - FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WE

November 4, 2019 EX-10.1

Westamerica Bancorporation 2019 Omnibus Equity Incentive Plan Stock Option Agreement Form, incorporated by reference to Exhibit 10.1 to the Registrant’s Form 10-Q, filed with the Securities and Exchange Commission on November 4, 2019.

EXHIBIT 10.1 WESTAMERICA BANCORPORATION EMPLOYEE STOCK OPTION GRANT NOTICE AND OPTION AGREEMENT (2019 Omnibus Equity Incentive Plan) As a key leader in our business, you are in a position to have significant influence on the performance and success of Westamerica Bancorporation (the “Company”). I am pleased to inform you that, in recognition of the role you play in our collective success, you have

October 24, 2019 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 24, 2019 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

October 24, 2019 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., Oct. 24, 2019 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.41 per share on common stock outstanding to shareholders of record at the close of business November 4, 2019. The dividend is payable November 15, 2019. Chairm

October 17, 2019 EX-99.1

Westamerica Bancorporation Reports Third Quarter 2019 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Third Quarter 2019 Financial Results SAN RAFAEL, Calif., Oct. 17, 2019 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the third quarter 2019 of $20.4 million and diluted earnings per common share ("EPS") of $0.75. These results compare to net income of $19.6 million and EPS o

October 17, 2019 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): October 17, 2019 WESTAMERICA BANCORPORATION (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Comm

September 27, 2019 S-8 POS

WABC / Westamerica Bancorporation S-8 POS - - S-8 POS

As filed with the Securities and Exchange Commission on September 27, 2019, Registration No.

September 27, 2019 EX-4

Westamerica Bancorporation 2019 Omnibus Equity Incentive Plan, incorporated by reference to Exhibit 4 to the Registrant’s Form S-8, filed with the Securities and Exchange Commission on September 27, 2019.

Exhibit 4 WESTAMERICA BANCORPORATION 2019 OMNIBUS EQUITY INCENTIVE PLAN Section 1.

September 27, 2019 S-8

WABC / Westamerica Bancorporation S-8 - - FORM S-8

As filed with the Securities and Exchange Commission on September 27, 2019, Registration No.

August 5, 2019 10-Q

Quarterly Report - FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☑ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WESTAME

July 25, 2019 EX-99.1

Westamerica Bancorporation Declares Quarterly Dividend and Announces Stock Repurchase Plan

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Dividend and Announces Stock Repurchase Plan SAN RAFAEL, Calif., July 25, 2019 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.41 per share on common stock outstanding to shareholders of record at the close of business August 5, 2019. The dividend is paya

July 25, 2019 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): July 25, 2019 WESTAMERICA BANCORPORATION (Exact Name of Registrant as Specified in Charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commission

July 18, 2019 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): July 18, 2019 WESTAMERICA BANCORPORATION (Exact Name of Registrant as Specified in Charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commission

July 18, 2019 EX-99.1

Westamerica Bancorporation Reports Second Quarter 2019 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Second Quarter 2019 Financial Results SAN RAFAEL, Calif., July 18, 2019 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the second quarter 2019 of $19.6 million and diluted earnings per common share ("EPS") of $0.73. These results compare to net income of $19.6 million and EPS

June 28, 2019 EX-10.2

Form of Indemnification Agreement between Westamerica Bank and its directors, incorporated by reference to the Exhibit 10.2 to the Registrant’s Form 8-K filed with the Securities and Exchange Commission on June 28, 2019.

Exhibit 10.2 INDEMNIFICATION AGREEMENT This Indemnification Agreement, dated as of June 27, 2019, is made by and between Westamerica Bank, a California banking corporation (the “Bank”), and [•] (the “Indemnitee”). WHEREAS, it is essential to the Bank to retain and attract as directors, officers and employees the most capable persons available; WHEREAS, the Indemnitee serves as an “agent” (as such

June 28, 2019 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers, Entry into a Material Definitive Agreement, Financial Statements and Exhibits

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): June 28, 2019 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Commiss

June 28, 2019 EX-10.1

Form of Indemnification Agreement between Westamerica Bancorporation and its directors, incorporated by reference to the Exhibit 10.1 to the Registrant’s Form 8-K filed with the Securities and Exchange Commission on June 28, 2019.

Exhibit 10.1 INDEMNIFICATION AGREEMENT This Indemnification Agreement, dated as of June 27, 2019, is made by and between Westamerica Bancorporation, a corporation organized under the laws of the State of California (the “Company”), and [•] (the “Indemnitee”). WHEREAS, it is essential to the Company to retain and attract as directors, officers and employees the most capable persons available; WHERE

June 26, 2019 11-K

WABC / Westamerica Bancorporation 11-K - - FORM 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K (Mark One) [X] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-09383 A. Full title of the pl

May 6, 2019 10-Q

Quarterly Report - FORM 10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2019 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WESTAM

April 29, 2019 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 29, 2019 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Commis

April 25, 2019 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): April 25, 2019 Westamerica Bancorporation (Exact Name of Registrant as Specified in Charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commission

April 25, 2019 EX-99.1

Westamerica Bancorporation Increases Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Increases Quarterly Cash Dividend SAN RAFAEL, Calif., April 25, 2019 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.41 per share on common stock outstanding to shareholders of record at the close of business May 6, 2019. The dividend is payable May 17, 2019. Chairman, Pres

April 18, 2019 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): April 18, 2019 Westamerica Bancorporation (Exact Name of Registrant as Specified in Charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commission

April 18, 2019 EX-99.1

Westamerica Bancorporation Reports First Quarter 2019 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports First Quarter 2019 Financial Results SAN RAFAEL, Calif., April 18, 2019 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the first quarter 2019 of $19.6 million and diluted earnings per common share ("EPS") of $0.73. These results compare to net income of $19.1 million and EPS

March 26, 2019 DEFA14A

WABC / Westamerica Bancorporation DEFA14A

SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 11, 2019 DEFA14A

WABC / Westamerica Bancorporation DEFA14A

SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 11, 2019 DEF 14A

WABC / Westamerica Bancorporation DEF 14A

SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

February 28, 2019 10-K

WABC / Westamerica Bancorporation FORM 10-K (Annual Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark one) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2018 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to. Commission File Number: 001-09383 WESTAMERICA B

February 28, 2019 EX-21

Subsidiaries of the registrant.

EXHIBIT 21 WESTAMERICA BANCORPORATION Subsidiaries as of December 31, 2018 State of Incorporation Westamerica Bank California Westamerica Mortgage Company — a subsidiary of Westamerica Bank California Community Banker Services Corporation — a subsidiary of Westamerica Bank California Weststar Mortgage Corporation — a subsidiary of Community Banker Services Corporation California Money Outlet, Inc.

February 14, 2019 SC 13G/A

WABC / Westamerica Bancorporation / EATON VANCE MANAGEMENT - WESTAMERICA Passive Investment

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 SCHEDULE 13G/A Under the Securities Exchange Act of 1934 (Amendment No.2)* (Name of Issuer) Westamerica Bancorporation Common Stock (Title of Class of Securities) 957090103 (CUSIP Number) December 31, 2018 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which

February 11, 2019 SC 13G/A

WABC / Westamerica Bancorporation / VANGUARD GROUP INC Passive Investment

westamericabancorporation.htm - Generated by SEC Publisher for SEC Filing SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 9 )* Name of issuer: Westamerica Bancorporation Title of Class of Securities: Common Stock CUSIP Number: 957090103 Date of Event Which Requires Filing of this Statement: December 31, 2018 Check the

February 11, 2019 SC 13G/A

WABC / Westamerica Bancorporation / AMERICAN CENTURY INVESTMENT MANAGEMENT INC - SC 13G/A Passive Investment

United States Securities and Exchange Commission Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 4)* WESTAMERICA BANCORPORATION (Name of Issuer) COMMON STOCK (Title of Class of Securities) 957090103 (CUSIP Number) DECEMBER 31, 2018 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which t

January 24, 2019 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): January 24, 2019 Westamerica Bancorporation (Exact Name of Registrant as Specified in Charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commissi

January 24, 2019 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., Jan. 24, 2019 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.40 per share on common stock outstanding to shareholders of record at the close of business February 4, 2019. The dividend is payable February 15, 2019. Chairm

January 17, 2019 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): January 17, 2019 Westamerica Bancorporation (Exact Name of Registrant as Specified in Charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commissi

January 17, 2019 EX-99.1

Westamerica Bancorporation Reports Fourth Quarter 2018 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Fourth Quarter 2018 Financial Results SAN RAFAEL, Calif., Jan. 17, 2019 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the fourth quarter 2018 of $19.1 million and diluted earnings per common share ("EPS") of $0.71 compared to $17.0 million and EPS of $0.63 for the third quar

January 3, 2019 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): January 3, 2019 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Commi

November 2, 2018 10-Q

WABC / Westamerica Bancorporation FORM 10-Q (Quarterly Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended September 30, 2018 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WE

October 25, 2018 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., Oct. 25, 2018 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ: WABC) today declared a quarterly cash dividend of $0.40 per share on common stock outstanding to shareholders of record at the close of business November 5, 2018. The dividend is payable November 16, 2018. Chairm

October 25, 2018 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): October 25, 2018 Westamerica Bancorporation (Exact Name of Registrant as Specified in Charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commissi

October 18, 2018 EX-99.1

Westamerica Bancorporation Reports Third Quarter 2018 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Third Quarter 2018 Financial Results SAN RAFAEL, Calif., Oct. 18, 2018 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq: WABC), parent company of Westamerica Bank, generated net income for the third quarter 2018 of $17.0 million and diluted earnings per common share ("EPS") of $0.63; third quarter 2018 results include a $585 thousand tax-exempt

October 18, 2018 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): October 18, 2018 Westamerica Bancorporation (Exact Name of Registrant as Specified in Charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commissi

August 3, 2018 10-Q

WABC / Westamerica Bancorporation FORM 10-Q (Quarterly Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended June 30, 2018 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WESTAME

July 26, 2018 EX-99.1

Good-Bye! (Leaving the SEC Website) This page is temporarily unavailable.

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Dividend and Announces Stock Repurchase Plan SAN RAFAEL, Calif., July 26, 2018 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ:WABC) today declared a quarterly cash dividend of $0.40 per share on common stock outstanding to shareholders of record at the close of business August 6, 2018. The dividend is payab

July 26, 2018 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): July 26, 2018 Westamerica Bancorporation (Exact Name of Registrant as Specified in Charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commission

July 19, 2018 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): July 19, 2018 Westamerica Bancorporation (Exact Name of Registrant as Specified in Charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commission

July 19, 2018 EX-99.1

Westamerica Bancorporation Reports Second Quarter 2018 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports Second Quarter 2018 Financial Results SAN RAFAEL, Calif., July 19, 2018 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq:WABC), parent company of Westamerica Bank, generated net income for the second quarter 2018 of $18.0 million and diluted earnings per common share ("EPS") of $0.67, compared to first quarter 2018 net income of $17.5 million an

June 20, 2018 11-K

WABC / Westamerica Bancorporation FORM 11-K

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 11-K (Mark One) [X] ANNUAL REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2017 OR [ ] TRANSITION REPORT PURSUANT TO SECTION 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to Commission file number 001-09383 A. Full title of the pl

May 4, 2018 10-Q

WABC / Westamerica Bancorporation FORM 10-Q (Quarterly Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q (Mark One) ☒ QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended March 31, 2018 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15 (d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to . Commission file number: 001-09383 WESTAM

April 30, 2018 8-K

Submission of Matters to a Vote of Security Holders

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): April 30, 2018 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Commis

April 26, 2018 8-K

Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): April 26, 2018 Westamerica Bancorporation (Exact Name of Registrant as Specified in Charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commission

April 26, 2018 EX-99.1

Westamerica Bancorporation Declares Quarterly Cash Dividend

EXHIBIT 99.1 Westamerica Bancorporation Declares Quarterly Cash Dividend SAN RAFAEL, Calif., April 26, 2018 (GLOBE NEWSWIRE) - The Board of Directors of Westamerica Bancorporation (NASDAQ:WABC) today declared a quarterly cash dividend of $0.40 per share on common stock outstanding to shareholders of record at the close of business May 7, 2018. The dividend is payable May 18, 2018. Chairman, Presid

April 19, 2018 8-K

Financial Statements and Exhibits, Results of Operations and Financial Condition

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Form 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934 Date of Report (Date of earliest event Reported): April 19, 2018 Westamerica Bancorporation (Exact Name of Registrant as Specified in Charter) California 001-09383 94-2156203 (State or Other Jurisdiction of Incorporation) (Commission

April 19, 2018 EX-99.1

Westamerica Bancorporation Reports First Quarter 2018 Financial Results

EXHIBIT 99.1 Westamerica Bancorporation Reports First Quarter 2018 Financial Results SAN RAFAEL, Calif., April 19, 2018 (GLOBE NEWSWIRE) - Westamerica Bancorporation (Nasdaq:WABC), parent company of Westamerica Bank, generated net income for the first quarter 2018 of $17.5 million and diluted earnings per common share ("EPS") of $0.66, compared to first quarter 2017 net income of $15.0 million and

March 26, 2018 8-K

Amendments to Articles of Incorporation or Bylaws; Change in Fiscal Year, Financial Statements and Exhibits, Other Events

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 22, 2018 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Commis

March 26, 2018 EX-3.2

By-laws, as amended (composite copy), incorporated by reference to Exhibit 3.2 to the Registrant’s Form 8-K, filed with the Securities and Exchange Commission on March 26, 2018.

Exhibit 3.2 BYLAWS OF WESTAMERICA BANCORPORATION ARTICLE I OFFICES Section 1.01. Principal Offices. The principal executive office of the corporation shall be located at 1108 Fifth Avenue, San Rafael, California, or such other place within or outside the State of California as shall be fixed by the board of directors. If the principal executive office is located outside this state, and the corpora

March 22, 2018 DEFA14A

WABC / Westamerica Bancorporation DEFA14A

SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 13, 2018 8-K

Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers

UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 FORM 8-K CURRENT REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 Date of Report (Date of earliest event reported): March 13, 2018 Westamerica Bancorporation (Exact name of registrant as specified in its charter) California 001-09383 94-2156203 (State or other jurisdiction of incorporation) (Commis

March 12, 2018 DEFA14A

WABC / Westamerica Bancorporation DEFA14A

SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

March 12, 2018 DEF 14A

WABC / Westamerica Bancorporation DEF 14A

SCHEDULE 14A (Rule 14a-101) INFORMATION REQUIRED IN PROXY STATEMENT SCHEDULE 14A INFORMATION Proxy Statement Pursuant to Section 14(a) of the Securities Exchange Act of 1934 (Amendment No.

February 27, 2018 10-K

WABC / Westamerica Bancorporation FORM 10-K (Annual Report)

UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-K (Mark one) ☒ ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the fiscal year ended December 31, 2017 or ☐ TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the transition period from to. Commission File Number: 001-09383 WESTAMERICA B

February 27, 2018 EX-21

Subsidiaries of the registrant.

EXHIBIT 21 WESTAMERICA BANCORPORATION Subsidiaries as of December 31, 2017 State of Incorporation Westamerica Bank California Westamerica Mortgage Company — a subsidiary of Westamerica Bank California Community Banker Services Corporation — a subsidiary of Westamerica Bank California Weststar Mortgage Corporation — a subsidiary of Community Banker Services Corporation California Money Outlet, Inc.

February 9, 2018 SC 13G/A

WABC / Westamerica Bancorporation / VANGUARD GROUP INC Passive Investment

westamericabancorporation.htm - Generated by SEC Publisher for SEC Filing SECURITIES AND EXCHANGE COMMISSION Washington, D.C. 20549 Schedule 13G Under the Securities Exchange Act of 1934 (Amendment No.: 8 )* Name of issuer: Westamerica Bancorporation Title of Class of Securities: Common Stock CUSIP Number: 957090103 Date of Event Which Requires Filing of this Statement: December 31, 2017 Check the

February 9, 2018 SC 13G/A

WABC / Westamerica Bancorporation / AMERICAN CENTURY INVESTMENT MANAGEMENT INC - SC 13G/A Passive Investment

United States Securities and Exchange Commission Washington, D.C. 20549 SCHEDULE 13G Under the Securities Exchange Act of 1934 (Amendment No. 3)* WESTAMERICA BANCORPORATION (Name of Issuer) COMMON STOCK (Title of Class of Securities) 957090103 (CUSIP Number) DECEMBER 31, 2017 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which t

Other Listings
DE:WB1 € 41.60
Fintel data has been cited in the following publications:
Daily Mail Fox Business Business Insider Wall Street Journal The Washington Post Bloomberg Financial Times Globe and Mail
NASDAQ.com Reuters The Guardian Associated Press FactCheck.org Snopes Politifact
Federal Register The Intercept Forbes Fortune Magazine TheStreet Time Magazine Canadian Broadcasting Corporation International Business Times
Cambridge University Press Investopedia MarketWatch NY Daily News Entrepreneur Newsweek Barron's El Economista