8-K/A 1 mst04006_10412.txt DECEMBER 8K/A UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D. C. 20549 FORM 8-K/A 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 27, 2004 MASTR ASSET SECURITIZATION TRUST Mortgage Pass-Through Certificates, Series 2004-6 Trust (Exact name of registrant as specified in its charter) New York (governing law of 333-106982-31 Pooling and Servicing Agreement) (Commission 54-2155148 (State or other File Number) 54-2155149 jurisdiction 54-2155150 of Incorporation) IRS EIN c/o Wells Fargo Bank, N.A. 9062 Old Annapolis Road Columbia, MD 21045 (Address of principal executive offices) (Zip Code) Registrant's telephone number, including area code: (410) 884-2000 (Former name or former address, if changed since last report) 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 Subsequent to filing the 8-K relating to the payment date on December 27, 2004, (All Certificates except Group 2) and December 28, 2004 (Group 2 Certificates) a revision was made to the MASTR ASSET SECURITIZATION TRUST, Mortgage Pass-Through Certificates, Series 2004-6 which was not included in the original 8-K filed. The 8-K is being amended because the underlying delinquency statistics and underlying certificate statistics were not included in the original 8-k filed. This information was not previously disclosed in a 1934 Act filing. The information has been and will continue to be available on the Wells Fargo Bank, website at www.ctslink.com. ITEM 9.01 Financial Statements and Exhibits (c) Exhibits Exhibit Number Description EX-99.1 Amended monthly report distributed to holders of Mortgage Pass-Through Certificates, Series 2004-6 Trust,(All Certificates except Group 2) relating to the December 27, 2004 distribution. Amended monthly report distributed to holders of Mortgage Pass-Through Certificates, Series 2004-6 Trust,(Group 2 Certificates) relating to the December 28, 2004 distribution. 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. MASTR ASSET SECURITIZATION TRUST Mortgage Pass-Through Certificates, Series 2004-6 Trust (Registrant) By: Wells Fargo Bank, N.A. as Master Servicer By: /s/ Beth Belfield as Assistant Vice President By: Beth Belfield as Assistant Vice President Date: 4/28/2005 INDEX TO EXHIBITS Exhibit Number Description EX-99.1 Amended monthly report distributed to holders of Mortgage Pass-Through Certificates, Series 2004-6 Trust, (All Certificates except Group 2)relating to the December 27, 2004 distribution. Amended monthly report distributed to holders of Mortgage Pass-Through Certificates, Series 2004-6 Trust, (Group 2 Certificates) relating to the December 28, 2004 distribution. EX-99.1

Delinquency Status By Groups

UNDERLYING DELINQUENCY STATISTICS Subordinated Outstanding Principal Current Cumulative 30 DAY Mortgage Certificates on Underlying Securities Losses Losses # $ % Mastr 2003-8 119,833,314.43 0.00 0.00 14 6,456,308.97 5.39%

UNDERLYING DELINQUENCY STATISTICS (cont.) 60 DAY 90 DAY F/C REO # $ % # $ % # $ % # $ % 2 863,411.00 0.72% 0 0.00 0.00% 0 0.00 0.00% 0 0.00 0.00%

UNDERLYING CERTIFICATE STATISTICS Begining Scheduled Balance 88,886,221.21 Scheduled Principal 104,369.70 Unscheduled Principal 1,349,832.52 Interest Distributed 407,395.18 Total Principal and Interest Distributed 1,861,597.40 Ending Scheduled Balance 87,432,018.99

MASTR Asset Securitization Trust 2004-6 8-K/A