================================================================================ 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 8, 2006 UnionBanCal Corporation ----------------------- (Exact name of registrant as specified in its charter) Delaware 001-15081 94-1234979 -------- --------- ---------- (State of Incorporation) (Commission File Number) (IRS Employer Identification No.) 400 California Street San Francisco, CA 94104-1302 ---------------------------- (Address of principal executive offices) (Zip Code) Tel. (415) 765-2969 ------------------- Registrant's telephone number, including area code Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below): [] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) [] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) [] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b)) [] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c)) ================================================================================ Item 8.01. Other Events. On December 8, 2006, UnionBanCal Corporation issued the press release attached to this report as exhibit 99.1, which is incorporated herein by reference. Item 9.01 Financial Statements and Exhibits. (c) Exhibits: Exhibit No. Description ----------- ----------- 99.1 Press Release dated December 8, 2006 SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized. Dated: December 8, 2006 UNIONBANCAL CORPORATION By: /S/ DAVID I. MATSON --------------------------------------- David I. Matson Vice Chairman and Chief Financial Officer (Duly Authorized Officer) EXHIBIT INDEX Exhibit No. Description ----------- ----------- 99.1 Press Release dated December 8, 2006