See restrictive legends on reverse side

Exhibit 4.1

UST Sequence Number: 166

See restrictive legends on reverse side

CoBiz Financial Inc.

a Colorado corporation

THIS CERTIFIES THAT The United States Department of the Treasury is the registered holder of Sixty Four Thousand Four Hundred Fifty (64,450) Shares of Fixed Rate Cumulative Perpetual Preferred Stock, Series B, $0.01 par value 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 19th day of December, A.D. 2008.

THE SECURITIES REPRESENTED BY THIS INSTRUMENT ARE NOT SAVINGS ACCOUNTS, DEPOSITS OR OTHER OBLIGATIONS OF A BANK AND ARE NOT INSURED BY THE FEDERAL DEPOSIT INSURANCE CORPORATION OR ANY OTHER GOVERNMENTAL AGENCY.

THE SECURITIES REPRESENTED BY THIS INSTRUMENT HAVE NOT BEEN REGISTERED UNDER THE SECURITIES ACT OF 1933, AS AMENDED (THE “SECURITIES ACT”), OR THE SECURITIES LAWS OF ANY STATE AND MAY NOT BE TRANSFERRED, SOLD OR OTHERWISE DISPOSED OF EXCEPT WHILE A REGISTRATION STATEMENT RELATING THERETO IS IN EFFECT UNDER SUCH ACT AND APPLICABLE STATE SECURITIES LAWS OR PURSUANT TO AN EXEMPTION FROM REGISTRATION UNDER SUCH ACT OR SUCH LAWS.  EACH PURCHASER OF SECURITIES REPRESENTED BY THIS INSTRUMENT IS NOTIFIED THAT THE SELLER MAY BE RELYING ON THE EXEMPTION FROM SECTION 5 OF THE SECURITIES ACT PROVIDED BY RULE 144A THEREUNDER.  ANY TRANSFEREE OF THE SECURITIES REPRESENTED BY THIS INSTRUMENT BY ITS ACCEPTANCE HEREOF (1) REPRESENTS THAT IT IS A “QUALIFIED INSTITUTIONAL BUYER” (AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT), (2) AGREES THAT IT WILL NOT OFFER, SELL OR OTHERWISE TRANSFER THE SECURITIES REPRESENTED BY THIS INSTRUMENT EXCEPT (A) PURSUANT TO A REGISTRATION STATEMENT WHICH IS THEN EFFECTIVE UNDER THE SECURITIES ACT, (B) FOR SO LONG AS THE SECURITIES REPRESENTED BY THIS INSTRUMENT ARE ELIGIBLE FOR RESALE PURSUANT TO RULE 144A, TO A PERSON IT REASONABLY BELIEVES IS A “QUALIFIED INSTITUTIONAL BUYER” AS DEFINED IN RULE 144A UNDER THE SECURITIES ACT THAT PURCHASES FOR ITS OWN ACCOUNT OR FOR THE ACCOUNT OF A QUALIFIED INSTITUTIONAL BUYER TO WHOM NOTICE IS GIVEN THAT THE TRANSFER IS BEING MADE IN RELIANCE ON RULE 144A, (C) TO THE ISSUER OR (D) PURSUANT TO ANY OTHER AVAILABLE EXEMPTION FROM THE REGISTRATION REQUIREMENTS OF THE SECURITIES ACT AND (3) AGREES THAT IT WILL GIVE TO EACH PERSON TO WHOM THE SECURITIES REPRESENTED BY THIS INSTRUMENT ARE TRANSFERRED A NOTICE SUBSTANTIALLY TO THE EFFECT OF THIS LEGEND.

FOR VALUE RECEIVED,                                                  hereby sell, assign and transfer unto                                                                                                                                                                                             Shares represented by the within Certificate, and do hereby irrevocably constitute and appoint                                                              Attorney to transfer the said Shares on the books of the within named Corporation with full power of substitution in the premises.

Dated                                                 , A.D. 20          .

In the 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.