Exhibit 4.1 Specimen stock certificate of Registrant CERRITOS VALLEY BANCORP Incorporated under the Laws of the State of California NUMBER SHARES THIS CERTIFIES THAT IS THE HOLDER OF Shares of the Capital Stock transferable only on the books of the Corporation by the holder hereof in person or by Attorney upon surrender of this Certificate properly endorsed. In Witness Whereof, the said Corporation has caused this Certificate to be signed by its duly authorized officers and its Corporate Seal to be hereunto affixed this day of A.D. ----- ----------- ------------------------------------ -------------------------------- SECRETARY PRESIDENT FOR VALUE RECEIVED _______________ HEREBY SELL, ASSIGN AND TRANSFER UNTO ________________________________________________________________________________ Please insert Social Security or Other Identifying Number of Assignee ______________________________________________________ SHARES REPRESENTED BY THE WITHIN CERTIFICATE AND DO HEREBY IRREVOCABLY CONSTITUTE AND APPOINT _______________________ ATTORNEY TO TRANSFER THE SAID SHARES ON THE SHARE REGISTER OF THE WITHIN NAMED CORPORATION WITH FULL POWER OF SUBSTITUTION IN THE PREMISES. DATED:______________________________ IN PRESENCE OF ________________________} ___________________________________ ________________________________________} ___________________________________ NOTICE: THE SIGNATURE OF THIS ASSIGNMENT MUST CORRESPOND WITH THE NAME AS WRITTEN UPON THE FACE OF THE CERTIFICATE, IN EVERY PARTICULAR, WITHOUT ALTERATION OR ENLARGEMENT, OR ANY CHANGE WHATEVER.