U.S. 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 13, 2004

BUSINESS BANCORP

(Exact name of registrant as specified in its charter)

000-31593

(Commission File Number)

California		33-0884369
(State or Other Jurisdiction of Incorporation or Organization)		(I.R.S. Employer Identification No.)

1248 Fifth Avenue
San Rafael, California 94901
(415) 784-2300
(Address and telephone number of principal executive offices)

Item 5. Other Events

On January 13, 2004, Business Bancorp issued a press release concerning the shareholder approval of the proposed merger of Business Bank of California with Union Bank of California, N.A. and Business Bancorp’s intention to complete the merger on January 15, 2004, a copy of which is furnished herewith as Exhibit 99.1.

Item 7. Exhibits

(c) Exhibits

99.1 Text of press release dated January 13, 2004

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized, on the 13th day of January, 2004.

	By /s/ Patrick E. Phelan
	Patrick E. Phelan
	Executive Vice President / Chief Financial Officer
	(Principal Financial Officer)
	(Principal Accounting Officer)
	Director

BUSINESS BANCORP /CA/ 8-K