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UNITED STATES SECURITIES AND EXCHANGE COMMISSION

Form 10-K

Commission File Number: 001-9383

Westamerica Bancorporation

1108 Fifth Avenue, San Rafael, California 94901

Registrant’s telephone number, including area code:

Securities registered pursuant to Section 12(b) of the Act:

Securities registered pursuant to Section 12(g) of the Act:

      Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.     Yes þ          No o

      Indicate by check mark if disclosure of delinquent filers pursuant to item 405 of Regulation S-K is not contained herein, and will not be contained, to the best of the registrant’s knowledge, in definitive proxy or information statements incorporated by reference in Part III of this Form 10-K or any amendment to this Form 10-K.     o

      Indicate by check mark whether the registrant is an accelerated filer (as defined in Rule 12b-2 of the Act).     Yes þ          No o

      Aggregate market value of the voting stock held by non-affiliates, computed by reference to the closing sales price of the stock, as of March 14, 2003: $1,231,248,000

      Number of shares outstanding of each of the registrant’s classes of common stock, as of the close of business on March 14, 2003: 32,917,670 Shares

DOCUMENTS INCORPORATED BY REFERENCE

Document*

TABLE OF CONTENTS

FORWARD-LOOKING STATEMENTS

      This Annual Report on Form 10-K contains forward-looking statements about Westamerica Bancorporation for which it claims the protection of the safe harbor provisions contained in the Private Securities Litigation Reform Act of 1995. These forward-looking statements are based on Management’s current knowledge and belief and include information concerning the Company’s possible or assumed future financial condition and results of operations. A number of factors, some of which are beyond the Company’s ability to predict or control, could cause future results to differ materially from those contemplated. These factors include but are not limited to (1) a continued slowdown in the national and California economies; (2) increased economic uncertainty created by the recent terrorist attacks on the United States and the actions taken in response; (3) the prospect of additional terrorist attacks in the United States and the uncertain effect of these events on the national and regional economies; (4) changes in the interest rate environment; (5) changes in the regulatory environment; (6) significantly increasing competitive pressure in the banking industry ; (7) operational risks including data processing system failures or fraud; (8) the effect of acquisitions and integration of acquired businesses; (9) volatility of rate sensitive deposits; (10) asset/ liability matching risks and liquidity risks; and (11) changes in the securities markets. See also “Certain Additional Business Risks” in Item 1. and other risk factors discussed elsewhere in this Report.

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PART I

Item 1.     Business

      WESTAMERICA BANCORPORATION (the “Company”) is a bank holding company registered under the Bank Holding Company Act of 1956 (“BHC”), as amended. Its legal headquarters are located at 1108 Fifth Avenue, San Rafael, California 94901. Principal administrative offices are located at 4550 Mangels Boulevard in Fairfield, California 94585 and its telephone number is (707) 863-8000. The Company provides a full range of banking services to individual and corporate customers in Northern and Central California through its subsidiary bank, Westamerica Bank (“WAB” or the “Bank”). The principal communities served are located in Northern and Central California, from Mendocino, Lake, Colusa and Nevada Counties in the North to Kern County in the South. The Company’s strategic focus is on the banking needs of small businesses. In addition, the Company also owns 100% of the capital stock of Community Banker Services Corporation, a company engaged in providing the Company and its subsidiaries data processing services and other support functions.

      The Company was incorporated under the laws of the State of California in 1972 as “Independent Bankshares Corporation” pursuant to a plan of reorganization among three previously unaffiliated Northern California banks. The Company operated as a multi-bank holding company until mid-1983, at which time the then six subsidiary banks were merged into a single bank named Westamerica Bank and the name of the holding company was changed to Westamerica Bancorporation.

      The Company acquired five additional banks within its immediate market area during the early to mid 1990’s. Under the terms of the merger agreements, the Company issued shares of its common stock in exchange for all of the outstanding shares of the acquired institutions. The subsidiary banks acquired were merged with and into WAB. These business combinations were accounted for as poolings-of-interests.

      In April, 1997, the Company acquired ValliCorp Holdings, Inc., parent company of ValliWide Bank, the largest independent bank holding company headquartered in Central California. The acquisition became effective through the issuance of shares of the Company’s common stock in exchange for all of the outstanding shares of ValliCorp. The business combination was accounted for as a pooling-of-interests. ValliWide Bank was merged with and into WAB.

      In August, 2000, the Company acquired First Counties Bank. The acquisition was valued at approximately $19.7 million and was accounted for using the purchase accounting method. The assets and liabilities of First Counties Bank were fully merged into WAB in September 2000. First Counties Bank had $91 million in assets and offices in Lake, Napa, and Colusa counties.

      In June of 2002 the Company acquired Kerman State Bank. The acquisition was valued at approximately $14.6 million and was accounted for using the purchase accounting method. The assets and liabilities of Kerman State Bank were fully merged into WAB immediately upon consummation of the merger. Kerman State Bank had $95 million in assets and three offices in Fresno county.

      At December 31, 2002, the Company had consolidated assets of approximately $4.3 billion, deposits of approximately $3.3 billion and shareholders’ equity of approximately $341 million. The Company and its subsidiaries employed 1,050 full-time equivalent staff.

      The Company makes available free of charge its annual report on Form 10-K, quarterly reports on Form 10-Q, current reports on Form 8-K and any amendments to those reports as soon as reasonably practicable after electronically filed with the Securities and Exchange Commission through its website (http://www.westamerica.com).

Certain Additional Business Risks

      The Company’s business, financial condition and operating results can be impacted by a number of factors including, but not limited to, those set forth below, any one of which could cause the Company’s actual results to vary materially from recent results or from the Company’s anticipated future results.

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      A portion of the loan portfolio of the Company is dependent on real estate. At December 31, 2002, real estate served as the principal source of collateral with respect to approximately fifty-three percent of the Company’s loan portfolio. A worsening of current economic conditions, increased economic uncertainty created by concerns regarding terrorist attacks and geo-political risks, or rising interest rates could have an adverse effect on the demand for new loans, the ability of borrowers to repay outstanding loans, the value of real estate and other collateral securing loans and the value of the available for sale securities portfolio, as well as the Company’s financial condition and results of operations in general and the market value of the Company’s common stock. Acts of nature, including earthquakes and floods, which may cause uninsured damage and other loss of value to real estate that secures these loans, may also negatively impact the Company’s financial condition.

      The earnings and growth of the Company are affected not only by local market area factors and general economic conditions, but also by government monetary and fiscal policies. Such policies influence the growth of loans, investments and deposits and also affect interest rates charged on loans and paid on deposits. The nature and impact of future changes in such policies on the business and earnings of the Company cannot be predicted. Additionally, state and federal tax policies can impact banking organizations.

      As a consequence of the extensive regulation of commercial banking activities in the United States, the business of the Company is particularly susceptible to being affected by the enactment of federal and state legislation which may have the effect of increasing or decreasing the cost of doing business, modifying permissible activities or enhancing the competitive position of other financial institutions. Any change in applicable laws or regulations may have a material adverse effect on the business and prospects of the Company.

      The Company is also subject to certain operations risks, including, but not limited to, data processing system failures and errors and customer or employee fraud. The Company maintains a system of internal controls to mitigate against such occurrences and maintains insurance coverage for such risks, but should such an event occur that is not prevented or detected by the Company’s internal controls, is not insured or is in excess of applicable insurance limits, it could have an adverse impact on the Company’s business, financial condition or results of operations.

      Shares of Company common stock eligible for future sale could have a dilutive effect on the market for Company common stock and could adversely affect the market price. The Articles of Incorporation of the Company authorize the issuance of 150 million shares of common stock (and two classes of 1 million shares each, denominated “Class B Common Stock” and “Preferred Stock”, respectively) of which approximately 33.4 million were outstanding at December 31, 2002. Pursuant to its stock option plans, at December 31, 2002, the Company had exercisable options outstanding of 1.78 million. As of December 31, 2002, 1.5 million shares of Company common stock remained available for grants under the Company’s stock option plans (and stock purchase plan). Sales of substantial amounts of Company common stock in the public market could adversely affect the market price of its common stock.

Supervision and Regulation

      The following is not intended to be an exhaustive description of the statutes and regulations applicable to the Company’s or the Bank’s business. The description of statutory and regulatory provisions is qualified in its entirety by reference to the particular statutory or regulatory provisions.

      Moreover, major new legislation and other regulatory changes affecting the Company, the Bank, banking, and the financial services industry in general have occurred in the last several years and can be expected to occur in the future. The nature, timing and impact of new and amended laws and regulations cannot be accurately predicted.

      The Company is a bank holding company subject to the Bank Holding Company Act of 1956, as amended (the “BHCA”). The Company reports to, is registered with, and may be examined by, the Board of

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      The Company is a bank holding company within the meaning of Section 3700 of the California Financial Code. As such, the Company and the Bank are subject to examination by, and may be required to file reports with, the California Commissioner of Financial Institutions (the “Commissioner”).

      The FRB has significant supervisory and regulatory authority over the Company and its affiliates. The FRB requires the Company to maintain certain levels of capital. See “Capital Standards.” The FRB also has the authority to take enforcement action against any bank holding company that commits any unsafe or unsound practice, or violates certain laws, regulations or conditions imposed in writing by the FRB. See “Prompt Corrective Action and Other Enforcement Mechanisms.” Under the BHCA, a company generally must obtain the prior approval of the FRB before it exercises a controlling influence over a bank, or acquires directly or indirectly, more than 5% of the voting shares or substantially all of the assets of any bank or bank holding company. Thus, the Company is required to obtain the prior approval of the FRB before it acquires, merges or consolidates with any bank or bank holding company. Any company seeking to acquire, merge or consolidate with the Company also would be required to obtain the prior approval of the FRB.

      The Company is generally prohibited under the BHCA from acquiring ownership or control of more than 5% of the voting shares of any company that is not a bank or bank holding company and from engaging directly or indirectly in activities other than banking, managing banks, or providing services to affiliates of the holding company. However, a bank holding company, with the approval of the FRB, may engage, or acquire the voting shares of companies engaged, in activities that the FRB has determined to be closely related to banking or managing or controlling banks. A bank holding company must demonstrate that the benefits to the public of the proposed activity will outweigh the possible adverse effects associated with such activity.

      A bank holding company may acquire banks in states other than its home state without regard to the permissibility of such acquisitions under state law, but subject to any state requirement that the Bank has been organized and operating for a minimum period of time, not to exceed five years, and the requirement that the Bank holding company, prior to or following the proposed acquisition, controls no more than 10% of the total amount of deposits of insured depository institutions in the United States and no more than 30% of such deposits in that state (or such lesser or greater amount set by state law). Banks may also merge across state lines, thereby creating interstate branches. Furthermore, a bank may open new branches in a state in which it does not already have banking operations, if the laws of such state permit such de novo branching.

      Under California law, (a) out-of-state banks that wish to establish a California branch office to conduct core banking business must first acquire an existing five year old California bank or industrial bank by merger or purchase, (b) California state-chartered banks are empowered to conduct various authorized branch-like activities on an agency basis through affiliated and unaffiliated insured depository institutions in California and other states and (c) the Commissioner is authorized to approve an interstate acquisition or merger that would result in a deposit concentration exceeding 30% if the Commissioner finds that the transaction is consistent with public convenience and advantage. However, a state bank chartered in a state other than California may not enter California by purchasing a California branch office of a California bank or industrial bank without purchasing the entire entity or by establishing a de novo California bank.

      The FRB generally prohibits a bank holding company from declaring or paying a cash dividend that would impose undue pressure on the capital of subsidiary banks or would be funded only through borrowing or other arrangements which might adversely affect a bank holding company’s financial position. Under the FRB policy, a bank holding company should not continue its existing rate of cash dividends on its common stock unless its net income is sufficient to fully fund each dividend and its prospective rate of earnings retention appears consistent with its capital needs, asset quality and overall financial condition. See the section entitled “Restrictions on Dividends and Other Distributions” for additional restrictions on the ability of the Company and the Bank to pay dividends.

      Transactions between the Company and the Bank are quantitatively and qualitatively restricted under Sections 23A and 23B of the Federal Reserve Act, and Regulation W, which becomes effective on April 1,

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      In general, a bank and its subsidiaries may engage in covered transactions with affiliates only on terms and under circumstances that are substantially the same, or at least as favorable to the bank or its subsidiary, as those prevailing at the time for comparable transactions with nonaffiliated companies. A “covered transaction” includes, among other things, a loan or extension of credit to an affiliate; a purchase of securities issued by an affiliate; a purchase of assets from an affiliate, with some exceptions; and the issuance of a guarantee, acceptance or letter of credit on behalf of an affiliate.

      In addition, under Regulation W: (i) a bank and its subsidiaries may not purchase a low-quality asset from an affiliate; (ii) covered transactions and other specified transactions between a bank or its subsidiaries and an affiliate must be on terms and conditions that are consistent with safe and sound banking practices; and (iii) with some exceptions, each loan or extension of credit by a bank to an affiliate must be secured by collateral with a market value ranging from 100% to 130%, depending on the type of collateral, of the amount of the loan or extension of credit.

      Concurrently with the adoption of Regulation W, the Federal Reserve Board has proposed a regulation which would further limit the amount of loans that could be purchased by a bank from an affiliate to not more than 100% of the bank’s capital and surplus. Comments on the proposed rule were due by January 13, 2003.

      Federal regulations governing bank holding companies and change in bank control (Regulation Y) provide for a streamlined and expedited review process for bank acquisition proposals submitted by well-run bank holding companies. These provisions of Regulation Y are subject to numerous qualifications, limitations and restrictions. In order for a bank holding company to qualify as “well-run,” both it and the insured depository institutions which it controls must meet the “well capitalized” and “well managed” criteria set forth in Regulation Y.

      On March 11, 2000, the Gramm-Leach-Bliley Act (the “GLBA”), or the Financial Services Act of 1999 became effective. The GLBA repealed provisions of the Glass-Steagall Act, which had prohibited commercial banks and securities firms from affiliating with each other and engaging in each other’s businesses. Thus, many of the barriers prohibiting affiliations between commercial banks and securities firms have been eliminated.

      The BHCA was also amended by the GLBA to allow new “financial holding companies” (“FHCs”) to offer banking, insurance, securities and other financial products to consumers. Specifically, the GLBA amended section 4 of the BHCA in order to provide for a framework for the engagement in new financial activities. A bank holding company (“BHC”) may elect to become a FHC if all its subsidiary depository institutions are well capitalized and well managed. If these requirements are met, a BHC may file a certification to that effect with the FRB and declare that it elects to become a FHC. After the certification and declaration is filed, the FHC may engage either de novo or though an acquisition in any activity that has been determined by the FRB to be financial in nature or incidental to such financial activity. BHCs may engage in financial activities without prior notice to the FRB if those activities qualify under the new list of permissible activities in section 4(k) of the BHCA. However, notice must be given to the FRB within 30 days after a FHC has commenced one or more of the financial activities. The Company has not elected to become a FHC.

      Under the GLBA, Federal Reserve member banks, subject to various requirements, as well as national banks, are permitted to engage through “financial subsidiaries” in certain financial activities permissible for affiliates of FHCs. However, to be able to engage in such activities the Bank must also be well capitalized and well managed and have received at least a “satisfactory” rating in its most recent CRA examination. The Company cannot be certain of the effect of the foregoing recently enacted legislation on its business, although there is likely to be consolidation among financial services institutions and increased competition for the Company.

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      The Bank is a California state-chartered bank, is insured by the Federal Deposit Insurance Corporation (the “FDIC”) and is a member bank of the Federal Reserve System. As such, the Bank is subject to regulation, supervision and regular examination by the California Department of Financial Institutions (“DFI”) and the FRB. As a member bank of the Federal Reserve System, the Bank’s primary federal regulator is the FRB. The regulations of these agencies affect most aspects of the Bank’s business and prescribe permissible types of loans and investments, the amount of required reserves, requirements for branch offices, the permissible scope of its activities and various other requirements.

      In addition to federal banking law, the Bank is also subject to applicable provisions of California law. Under California law, the Bank is subject to various restrictions on, and requirements regarding, its operations and administration including the maintenance of branch offices and automated teller machines, capital requirements, deposits and borrowings, stockholder rights and duties, and investment and lending activities.

      California law permits a state chartered bank to invest in the stock and securities of other corporations, subject to a state-chartered bank receiving either general authorization or, depending on the amount of the proposed investment, specific authorization from the Commissioner. However, because the Bank is a member of the Federal Reserve System, its investment authority is limited by regulations promulgated by the FRB. In addition, the Federal Deposit Insurance Corporation Improvement Act (“FDICIA”) imposes limitations on the activities and equity investments of state chartered, federally insured banks. FDICIA also prohibits a state bank from making an investment or engaging in any activity as a principal that is not permissible for a national bank, unless the Bank is adequately capitalized and the FDIC approves the investment or activity after determining that such investment or activity does not pose a significant risk to the deposit insurance fund.

      The federal banking agencies have risk-based capital adequacy guidelines intended to provide a measure of capital adequacy that reflects the degree of risk associated with a banking organization’s operations for both transactions reported on the balance sheet as assets, and transactions such as letters of credit and recourse arrangements, which are recorded as off balance sheet items. Under these guidelines, nominal dollar amounts of assets and credit equivalent amounts of off balance sheet items are multiplied by one of several risk adjustment percentages, which range from 0% for assets with low credit risk, such as certain U.S. government securities, to 100% for assets with relatively higher credit risk, such as certain loans.

      As of December 31, 2002, the Company’s and the Bank’s respective ratios exceeded applicable regulatory requirements. See Note 8 to the consolidated financial statements for capital ratios of the Company and the Bank, compared to the standards for well capitalized depository institutions and for minimum capital requirements.

      The federal banking agencies take into consideration concentrations of credit risk and risks from nontraditional activities, as well as an institution’s ability to manage those risks, when determining the adequacy of an institution’s capital. This evaluation is made as a part of the institution’s regular safety and soundness examination. The federal banking agencies also consider interest rate risk (when the interest rate sensitivity of an institution’s assets does not match the sensitivity of its liabilities or its off balance sheet position) in evaluation of a bank’s capital adequacy.

      FDICIA also implemented certain specific restrictions on transactions and required federal banking regulators to adopt overall safety and soundness standards for depository institutions related to internal control, loan underwriting and documentation and asset growth. Among other things, FDICIA limits the interest rates paid on deposits by undercapitalized institutions, restricts the use of brokered deposits, limits the aggregate extensions of credit by a depository institution to an executive officer, director, principal shareholder or related interest, and reduces deposit insurance coverage for deposits offered by undercapitalized institutions for deposits by certain employee benefits accounts. The federal banking agencies may require an institution to

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      The power of the board of directors of an insured depository institution to declare a cash dividend or other distribution with respect to capital is subject to statutory and regulatory restrictions which limit the amount available for such distribution depending upon the earnings, financial condition and cash needs of the institution, as well as general business conditions. FDICIA prohibits insured depository institutions from paying management fees to any controlling persons or, with certain limited exceptions, making capital distributions, including dividends, if, after such transaction, the institution would be undercapitalized.

      In addition to the restrictions imposed under federal law, banks chartered under California law generally may only pay cash dividends to the extent such payments do not exceed the lesser of retained earnings of the bank or the bank’s net income for its last three fiscal years (less any distributions to shareholders during this period). In the event a bank desires to pay cash dividends in excess of such amount, the bank may pay a cash dividend with the prior approval of the Commissioner in an amount not exceeding the greatest of the bank’s retained earnings, the bank’s net income for its last fiscal year or the bank’s net income for its current fiscal year.

      The federal banking agencies also have the authority to prohibit a depository institution from engaging in business practices which are considered to be unsafe or unsound, possibly including payment of dividends or other payments under certain circumstances even if such payments are not expressly prohibited by statute.

      The Bank’s deposits are insured by the Bank Insurance Fund (BIF) administered by the FDIC. FDICIA established several mechanisms to increase funds to protect deposits insured by the BIF administered by the FDIC. The FDIC is authorized to borrow up to $30 billion from the United States Treasury; up to 90% of the fair market value of assets of institutions acquired by the FDIC as receiver from the Federal Financing Bank; and from depository institutions which are members of the BIF. Any borrowings not repaid by asset sales are to be repaid through insurance premiums assessed to member institutions. Such premiums must be sufficient to repay any borrowed funds within 15 years and provide insurance fund reserves of $1.25 for each $100 of insured deposits. FDICIA also provides authority for special assessments against insured deposits. No assurance can be given at this time as to what the future level of insurance premiums will be.

      The Bank is subject to certain fair lending requirements and reporting obligations involving home mortgage lending operations and Community Reinvestment Act (“CRA”) activities. The CRA generally requires the federal banking agencies to evaluate the record of a financial institution in meeting the credit needs of their local communities, including low and moderate income neighborhoods. In addition to substantive penalties and corrective measures that may be required for a violation of certain fair lending laws, the federal banking agencies may take compliance with such laws and CRA into account when regulating and supervising other activities.

      The GLBA, in addition to the previously described changes in permissible nonbanking activities permitted to banks, BHCs and FHCs, also required the federal banking agencies, among other federal regulatory agencies, to adopt regulations governing the privacy of consumer financial information. The FRB adopted such regulations with an effective date of November 13, 2000, and a date of full compliance with the regulations of July 1, 2001. The Bank is subject to the FRB’s regulations.

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      The regulations impose three main requirements established by the GLBA. First, a banking organization must provide initial notices to customers about their privacy policies, describing the conditions under which they may disclose nonpublic personal information to nonaffiliated third parties and affiliates, such as the Company. Second, banking organizations must provide annual notices of their privacy policies to their current customers. Third, banking organizations must provide a reasonable method for consumers to “opt-out” of disclosures to nonaffiliated third parties.

      In connection with the regulations governing the privacy of consumer financial information, the federal banking agencies, including the FRB, adopted guidelines for safeguarding confidential customer information, effective on July 1, 2001. The guidelines require banking organizations to establish an information security program to: (1) identify and assess the risks that may threaten customer information; (2) develop a written plan containing policies and procedures to manage and control these risks; (3) implement and test the plan; and (4) adjust the plan on a continuing basis to account for changes in technology, the sensitivity of customer information, and internal or external threats. The guidelines also outline the responsibilities of directors of banking organizations in overseeing the protection of customer information.

      On October 26, 2001, the President signed into law the Uniting and Strengthening America by Providing Appropriate Tools Required to Intercept and Obstruct Terrorism Act of 2001 or the “USA Patriot Act.” Title III of the Act is the International Money Laundering Abatement and Anti-Terrorist Financing Act of 2001. It includes numerous provisions for fighting international money laundering and blocking terrorist access to the U.S. financial system. The goal of Title III is to prevent the U.S. financial system and the U.S. clearing mechanisms from being used by parties suspected of terrorism, terrorist financing and money laundering.

      The provisions of Title III of the USA Patriot Act which affect banking organizations, including the Bank, are generally set forth as amendments to the Bank Secrecy Act. These provisions relate principally to U.S. banking organizations’ relationships with foreign banks and with persons who are resident outside the United States. The USA Patriot Act does not immediately impose any new filing or reporting obligations for banking organizations, but does require certain additional due diligence and recordkeeping practices. Some requirements take effect without the issuance of regulations. Other provisions are to be implemented through regulations that will be promulgated by the U.S. Department of the Treasury, in consultation with the FRB and other federal financial institutions regulators.

      On July 30, 2002, President Bush signed into law the Sarbanes-Oxley Act of 2002 (“Sarbanes-Oxley”). Certain provisions of the statute became effective upon enactment on July 30, 2002 while other provisions will become effective within one year form enactment. The stated goals of Sarbanes-Oxley are to increase corporate responsibility, to provide for enhanced penalties for accounting and auditing improprieties at publicly traded companies and to protect investors by improving the accuracy and reliability of corporate disclosures pursuant to the securities laws.

      Sarbanes-Oxley generally applies to all companies, both U.S. and non-U.S., that file or are required to file periodic reports under the Securities Exchange Act of 1934 (the “Exchange Act”). Given the extensive role of the Securities and Exchange Commission (the “SEC”) in implementing rules relating to many of Sarbanes-Oxley’s new requirements, the final scope of these requirements remains to be determined. Sarbanes-Oxley includes very specific additional disclosure requirements and new corporate governance rules, requires the SEC and securities exchanges to adopt extensive additional disclosure, corporate governance and other related rules and mandates further studies of certain issues. Sarbanes-Oxley represents significant federal involvement in matters traditionally left to state regulatory systems, such as the regulation of the accounting profession, and to state corporate law, such as the relationship between a board of directors and management and between a board of directors and its committees.

      Sarbanes-Oxley addresses, among other matters: (i) audit committees for all reporting companies; (ii) certification of financial statements by the chief executive officer and the chief financial officer; (iii) the forfeiture of bonuses or other incentive-based compensation and profits from the sale of an issuer’s securities by directors and senior officers in the twelve month period following initial publication of any financial

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      Certain pending legislative proposals include bills to permit banks to pay interest on business checking accounts, to cap consumer liability for stolen debit cards, to end certain predatory lending practices, to allow the payment of interest on reserves that financial institutions must keep with FRB and to give judges the authority to force high-income borrowers to repay their debts rather than cancel them through bankruptcy. A proposal to merge the FDIC’s two funds, the BIF and the Savings Association Insurance Fund, is also being discussed.

      While the effect of such proposed legislation on the business of the Company cannot be accurately predicted at this time, it seems likely that a significant amount of consolidation in the banking industry will continue.

Competition

      In the past, WAB’s principal competitors for deposits and loans have been other banks (particularly major banks), savings and loan associations and credit unions. To a lesser extent, competition was also provided by thrift and loans, mortgage brokerage companies and insurance companies. Other institutions, such as brokerage houses, mutual fund companies, credit card companies, and certain retail establishments have offered investment vehicles which also compete with banks for deposit business. Federal legislation in recent years has encouraged competition between different types of financial institutions and fostered new entrants into the financial services market, and it is anticipated that this trend will continue.

      The enactment of the Interstate Banking and Branching Act in 1994 and the California Interstate Banking and Branching Act of 1995 have increased competition within California. Regulatory reform, as well as other changes in federal and California law will also affect competition. While the impact of these changes, and of other proposed changes, cannot be predicted with certainty, it is clear that the business of banking in California will remain highly competitive.

      Legislative changes, as well as technological and economic factors, can be expected to have an ongoing impact on competitive conditions within the financial services industry. As an active participant in the financial markets, the Company believes that it continually adapts to these changing competitive conditions.

      According to information obtained through an independent market research firm, WAB was the nineteenth largest financial institution in California in terms of total deposits at December 31, 2001. In the individual markets in which it has branch offices, WAB was the third largest financial institution, with a core deposit market share of approximately 9.52%. The share of individual markets within the overall market varies, with the most dominant continuing to be in the San Rafael area of Marin County, where WAB ranked first with 28.7% of the core deposit market among federally-insured depository institutions. WAB’s share of core deposits in the other markets it serves in Marin County was 19.9%.

      WAB is engaged in the banking business through 90 offices in 23 counties in Northern and Central California including eleven offices each in Marin and Fresno Counties, nine in Sonoma County, seven in Napa County, six each in Solano, Kern, Stanislaus and Contra Costa Counties, five in Lake County, three each in Mendocino and Sacramento Counties, two each in Nevada, Placer, Tulare and Tuolumne and Alameda

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      The Company owns 32 branch office locations and one administrative facility and leases 69 facilities. Most of the leases contain multiple renewal options and provisions for rental increases, principally for changes in the cost of living index, property taxes and maintenance.

      Neither the Company nor any of its subsidiaries is a party to any material pending legal proceeding, nor is their property the subject of any material pending legal proceeding, except ordinary routine legal proceedings arising in the ordinary course of the Company’s business. None of these proceedings is expected to have a material adverse impact upon the Company’s business, financial position or results of operations.

      There were no matters submitted to a vote of the shareholders during the fourth quarter of 2002.

PART II

      The Company’s common stock is traded on the NASDAQ National Market System (“NASDAQ”) under the symbol “WABC”. The following table shows the high and the low bid prices for the common stock, for each quarter, as reported by NASDAQ:

      As of March 14, 2003, there were approximately 9,000 shareholders of record of the Company’s common stock.

      The Company has paid cash dividends on its common stock in every quarter since its formation in 1972, and it is currently the intention of the Board of Directors of the Company to continue payment of cash dividends on a quarterly basis. There is no assurance, however, that any dividends will be paid since they are dependent upon earnings, financial condition and capital requirements of the Company and its subsidiaries as well as policies of the Federal Reserve Board pursuant to the BHCA. See Item 1, “Business, Supervision and Regulation”. As of December 31, 2002, $164.9 million was available for payment of dividends by the Company to its shareholders, under applicable laws and regulations.

      See Note 17 to the consolidated financial statements included in this report for additional information regarding the amount of cash dividends declared and paid on common stock for the three most recent fiscal years.

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      As discussed in Note 7 to the consolidated financial statements, in December 1986, the Company declared a dividend distribution of one common share purchase right (the “Right”) for each outstanding share of common stock. The terms of the Rights were most recently amended and restated on October 28, 1999 and became effective on November 19, 1999. The new amended plan is very similar in purpose and effect to the plan as it existed prior to this amendment, aimed at helping the Board of Directors to maximize shareholder value in the event of a change of control of the Company and otherwise resist actions that the Board considers likely to injure the Company or its shareholders. In addition to extending the maturity date of the plan to December 31, 2004, the other material changes included: (1) an increase in the exercise price to $75.00 per share; (2) a decrease in the redemption price of each Right to $.001; and (3) a reduction in the amount of securities required to be acquired for a person or entity to become an Acquiring Person, thus triggering the shareholders’ rights, from 15% to 10%.

      The information required by this Item 5, from Regulation S-K, Item 201(d), is incorporated herein by reference from the “Equity Compensation Plan Information” section on pages 16 and 17 of the Company’s definitive Proxy Statement dated March 17, 2003, which has been filed with the Commission pursuant to Regulation 14A.

11

      The following financial information for the five years ended December 31, 2002 has been derived from the Company’s Consolidated Financial Statements. This information should be read in conjunction with the Consolidated Financial Statements and related notes thereto included elsewhere herein.

WESTAMERICA BANCORPORATION

FINANCIAL SUMMARY