============================================================================== UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 SCHEDULE 13G UNDER THE SECURITIES EXCHANGE ACT OF 1934 (AMENDMENT NO. 8)* UNIONBANCAL CORPORATION (Name of Issuer) COMMON STOCK (Title of Class of Securities) 908906100 (CUSIP Number) DECEMBER 31, 2006 (Date of Event Which Requires Filing of this Statement) Check the appropriate box to designate the rule pursuant to which this Schedule is filed: [_] Rule 13d-1(b) [_] Rule 13d-1(c) [X] Rule 13d-1(d) * The remainder of this cover page shall be filled out for a reporting person's initial filing on this form with respect to the subject class of securities, and for any subsequent amendment containing information which would alter the disclosures provided in a prior cover page. The information required in the remainder of this cover page shall not be deemed to be "filed" for the purpose of Section 18 of the Securities Exchange Act of 1934 ("Act") or otherwise subject to the liabilities of that section of the Act but shall be subject to all other provisions of the Act (however, see the Notes). ============================================================================== CUSIP No. 908906100 --------- -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (Entities Only) Mitsubishi UFJ Financial Group, Inc. -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions) (a) [_] (b) [_] -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Tokyo, Japan -------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 90,279,397 ---------------------------------------- BENEFICIALLY 6 SHARED VOTING POWER OWNED BY -0- ---------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING 90,279,397 ---------------------------------------- PERSON 8 SHARED DISPOSITIVE POWER WITH -0- -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 90,279,397 -------------------------------------------------------------------------------- 10 CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (See Instructions) [_] -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 64.9% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON (See Instructions) CO -------------------------------------------------------------------------------- Page 2 of 13 CUSIP No. 908906100 --------- -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (Entities Only) The Bank of Tokyo-Mitsubishi UFJ, Ltd. -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions) (a) [_] (b) [_] -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Tokyo, Japan -------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 90,217,308 ---------------------------------------- BENEFICIALLY 6 SHARED VOTING POWER OWNED BY -0- ---------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING 90,217,308 ---------------------------------------- PERSON 8 SHARED DISPOSITIVE POWER WITH -0- -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 90,217,308 -------------------------------------------------------------------------------- 10 CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (See Instructions) [_] -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 64.9% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON (See Instructions) CO -------------------------------------------------------------------------------- Page 3 of 13 CUSIP No. 908906100 --------- -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (Entities Only) Mitsubishi UFJ Trust and Banking Corporation -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions) (a) [_] (b) [_] -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Tokyo, Japan -------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 54,089 ---------------------------------------- BENEFICIALLY 6 SHARED VOTING POWER OWNED BY -0- ---------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING 54,089 ---------------------------------------- PERSON 8 SHARED DISPOSITIVE POWER WITH -0- -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 54,089 -------------------------------------------------------------------------------- 10 CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (See Instructions) [_] -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 0.0% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON (See Instructions) CO -------------------------------------------------------------------------------- Page 4 of 13 CUSIP No. 908906100 --------- -------------------------------------------------------------------------------- 1 NAME OF REPORTING PERSON I.R.S. IDENTIFICATION NO. OF ABOVE PERSON (Entities Only) Mitsubishi UFJ Asset Management Co., Ltd. -------------------------------------------------------------------------------- 2 CHECK THE APPROPRIATE BOX IF A MEMBER OF A GROUP (See Instructions) (a) [_] (b) [_] -------------------------------------------------------------------------------- 3 SEC USE ONLY -------------------------------------------------------------------------------- 4 CITIZENSHIP OR PLACE OF ORGANIZATION Tokyo, Japan -------------------------------------------------------------------------------- NUMBER OF 5 SOLE VOTING POWER SHARES 8,000 ---------------------------------------- BENEFICIALLY 6 SHARED VOTING POWER OWNED BY -0- ---------------------------------------- EACH 7 SOLE DISPOSITIVE POWER REPORTING 8,000 ---------------------------------------- PERSON 8 SHARED DISPOSITIVE POWER WITH -0- -------------------------------------------------------------------------------- 9 AGGREGATE AMOUNT BENEFICIALLY OWNED BY EACH REPORTING PERSON 8,000 -------------------------------------------------------------------------------- 10 CHECK IF THE AGGREGATE AMOUNT IN ROW (9) EXCLUDES CERTAIN SHARES (See Instructions) [_] -------------------------------------------------------------------------------- 11 PERCENT OF CLASS REPRESENTED BY AMOUNT IN ROW (9) 0.0% -------------------------------------------------------------------------------- 12 TYPE OF REPORTING PERSON (See Instructions) CO -------------------------------------------------------------------------------- Page 5 of 13 CUSIP No. 908906100 --------- ITEM 1 (a) NAME OF ISSUER UnionBanCal Corporation (b) ADDRESS OF ISSUER'S PRINCIPAL EXECUTIVE OFFICES 400 California Street, San Francisco, California 94104-1476, U.S.A. ITEM 2 (a) NAMES OF PERSONS FILING Mitsubishi UFJ Financial Group, Inc. ("MUFG") The Bank of Tokyo-Mitsubishi UFJ, Ltd. ("BTMU") Mitsubishi UFJ Trust and Banking Corporation ("MUTB") Mitsubishi UFJ Asset Management Co., Ltd. ("MUAM") (b) ADDRESS OF PRINCIPAL BUSINESS OFFICE OR, IF NONE, RESIDENCE MUFG: 7-1 Marunouchi 2-chome, Chiyoda-ku Tokyo 100-8330, Japan BTMU: 7-1 Marunouchi 2-chome, Chiyoda-ku Tokyo 100-8388, Japan MUTB: 4-5 Marunouchi 1-chome, Chiyoda-ku Tokyo 100-8212, Japan MUAM: 4-5 Marunouchi 1-chome, Chiyoda-ku Tokyo 100-8212, Japan (c) CITIZENSHIP Not applicable. (d) TITLE OF CLASS OF SECURITIES Common Stock (e) CUSIP NUMBER 908906100 Page 6 of 13 CUSIP No. 908906100 --------- ITEM 3 IF THIS STATEMENT IS FILED PURSUANT TO SECTION 240.13d-1(b) OR 240.13d-2(b) OR (c), CHECK WHETHER THE PERSON FILING IS A: (a) [ ] Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o). (b) [ ] Bank as defined in section 3 (a) (6) of the Act (15 U.S.C. 78c). (c) [ ] Insurance company as fined in section 3(a) (19) of the Act (15 U.S.C. 78c). (d) [ ] Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8). (e) [ ] An investment adviser in accordance with section 240.13d-1(b) (1) (ii) (E); (f) [ ] An employee benefit plan or endowment fund in accordance with section 240.13d-1(b)(1)(ii)(F); (g) [ ] A parent holding company or control person in accordance with section 240.13d-1(b) (1) (ii) (G); (h) [ ] A savings association as defined in section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813); (i) [ ] A church plan that is excluded from the definition of an investment company under section 3(c) (14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3); (j) [ ] Group, in accordance with section 240.13d-1(b)(1)(ii)(J). ITEM 4 OWNERSHIP Provide the following information regarding the aggregate number and percentage of the class of securities of the issuer identified in Item 1. For MUFG (a) Amount Beneficially Owned: 90,279,397 (b) Percent of Class: 64.90% (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote: 90,279,397 (ii) Shared power to vote or to direct the vote: -0- (iii) Sole power to dispose or to direct the disposition of: 90,279,397 (iv) Shared power to dispose or to direct the disposition of: -0- For BTMU (a) Amount Beneficially Owned: 90,217,308 (b) Percent of Class: 64.85% (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote: 90,217,308 (ii) Shared power to vote or to direct the vote: -0- Page 7 of 13 CUSIP No. 908906100 --------- (iii) Sole power to dispose or to direct the disposition of: 90,217,308 (iv) Shared power to dispose or to direct the disposition of: -0- For MUTB (a) Amount Beneficially Owned: 54,089 (b) Percent of Class: 0.04% (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote: 54,089 (ii) Shared power to vote or to direct the vote: -0- (iii) Sole power to dispose or to direct the disposition of: 54,089 (iv) Shared power to dispose or to direct the disposition of: -0- For MUAM (a) Amount Beneficially Owned: 8,000 (b) Percent of Class: 0.01% (c) Number of shares as to which the person has: (i) Sole power to vote or to direct the vote: 8,000 (ii) Shared power to vote or to direct the vote: -0- (iii) Sole power to dispose or to direct the disposition of: 8,000 (iv) Shared power to dispose or to direct the disposition of: -0- ITEM 5 OWNERSHIP OF FIVE PERCENT OR LESS OF A CLASS Not applicable. ITEM 6 OWNERSHIP OF MORE THAN FIVE PERCENT ON BEHALF OF ANOTHER PERSON Not applicable. ITEM 7 IDENTIFICATION AND CLASSIFICATION OF THE SUBSIDIARY WHICH ACQUIRED THE SECURITY BEING REPORTED ON BY THE PARENT HOLDING COMPANY As of December 31, 2006, MUFG beneficially owns 90,279,397 shares indirectly through its subsidiaries as follows: BTMU holds 90,217,308 shares; MUTB holds 54,089 shares; and MUAM holds 8,000 shares. ITEM 8 IDENTIFICATION AND CLASSIFICATION OF MEMBERS OF THE GROUP Not applicable. Page 8 of 13 CUSIP No. 908906100 --------- ITEM 9 NOTICE OF DISSOLUTION OF GROUP Not applicable. ITEM 10 CERTIFICATION Not applicable. Page 9 of 13 CUSIP No. 908906100 --------- SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Date: January 31, 2007 MITSUBISHI UFJ FINANCIAL GROUP, INC. By: /s/ Takami Onodera ------------------------------- Name: Takami Onodera Title: General Manager, Credit & Investment Management Division Page 10 of 13 CUSIP No. 908906100 --------- SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Date: January 31, 2007 THE BANK OF TOKYO-MITSUBISHI UFJ, LTD. By: /s/ Akira Kamiya ------------------------------------ Name: Akira Kamiya Title: Executive Officer & General Manager Global Planning Divison Page 11 of 13 CUSIP No. 908906100 --------- SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Date: January 31, 2007 MITSUBISHI UFJ TRUST AND BANKING CORPORATION By: /s/ Koji Kawakami -------------------------------------- Name: Koji Kawakami Title: Deputy General Manager of Trust Assets Planning Division Page 12 of 13 CUSIP No. 908906100 --------- SIGNATURE After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct. Date: January 31, 2007 MITSUBISHI UFJ ASSET MANAGEMENT CO., LTD. By: /s/ Yasushi Inoue ----------------------------------- Name: Yasushi Inoue Title: General Manager of Risk Management Division Page 13 of 13