MOODY'S RATES MASTR ADJUSTABLE RATE MORTGAGES TRUST 2004-6 Aaa
Approximately $470.8 Million of Mortgage-Backed Securities Rated
New York, July 14, 2004 -- Moody's Investors Service has assigned an Aaa rating to the senior certificates
issued by MASTR Adjustable Rate Mortgages Trust 2004-6, and
ratings ranging from Aa3 to Baa3 to the subordinate certificates in the
deal. The Aa1 rating for the Class 4-A-8 certificates
considers it will be allocated losses from the Class 4-A-5
certificates after the subordinate certificates are reduced to zero and
the Aa1 rating for Class 4-A-9 certificates considers it
will be allocated losses from the Class 4-A-6 certificates,
and the severity of those losses on the Class 4-A-8 and
Class 4-A-9 certificates, since it represents approximately
7.0% of the Class 4-A-5 certificate size and
5.0% of the Class 4-A-6 certificate size.
The securitization is backed by multiple originators' adjustable-rate
Alt-A mortgage loans acquired by UBS Real Estate Securities,
Inc. The ratings are based primarily on the credit quality of the
loans and on the 5.75% protection from subordination.
The credit quality of the loan pool is similar to other UBS ARM securitizations
issued under this shelf.
The certificates are secured by average Alt- A collateral with
an above average weighted-average FICO of 727 and a loan-to-value
ratio (LTV) of approximately 70.72%. Investor properties
account for 7.58% of the pool and the performance could
be more volatile compared to owner occupied dwellings. The pool
is concentrated in California, which comprises 50.8%
of the loans. The borrower pays interest only for the initial fixed-rate
period on approximately 68% of the loans in the pool and this could
increase the loss severity in the event of default.
GMAC Mortgage Corporation (34.37%), Washington Mutual
Mortgage Securities Corp. (28.95%), National
City Mortgage Company (11.70%), Provident Funding
Associates, L.P. (9.97%), GreenPoint
Mortgage Funding, Inc. (9.49%), and others
will service the loans, and Wells Fargo Bank, N.A.
will act as master servicer.
THE COMPLETE RATING ACTIONS ARE AS FOLLOWS:
Issuer: MASTR Adjustable Rate Mortgages Trust 2004-6
Class 1-A-1, $39,878,000,
Senior P&I, Variable, rated Aaa
Class 2-A-1, $70,646,000,
Senior P&I, Variable, rated Aaa
Class 3-A-1, $40,507,000,
Senior P&I, Variable, rated Aaa
Class 4-A-1, $39,814,000,
Senior P&I, Variable, rated Aaa
Class 4-A-2, $16,969,000,
Senior P&I, Variable, rated Aaa
Class 4-A-3, $29,953,000,
Senior P&I, Variable, rated Aaa
Class 4-A-4, $21,583,000,
Senior P&I, Variable, rated Aaa
Class 4-A-5, $19,065,000,
Senior P&I, Variable, rated Aaa
Class 4-A-6, $55,537,000,
Senior P&I, Variable, rated Aaa
Class 4-A-7, $50,000,000,
Senior P&I, Variable, rated Aaa
Class 4-A-8, $1,435,000,
Senior P&I, Variable, rated Aa1
Class 4-A-9, $2,923,000,
Senior P&I, Variable, rated Aa1
Class 4-A-X, $0, Senior IO, Variable,
rated Aaa
Class 5-A-1, $21,671,000,
Senior P&I, Variable, rated Aaa
Class 6-A-1, $40,313,000,
Senior P&I, Variable, rated Aaa
Class B-1, $11,944,000, Subordinate
P&I, Variable, rated Aa3
Class B-2, $5,733,000, Subordinate
P&I, Variable, rated A3
Class B-3, $2,867,000, Subordinate
P&I, Variable, rated Baa3
Mortgage Asset Securitization Transaction, Inc. (MAST) is
a Delaware corporation established for acquiring mortgage loans and acting
as depositor. MAST is a wholly-owned subsidiary of UBS Americas,
Inc. MASTR Adjustable Rate Mortgages Trust 2004-6 is a REMIC
established for acquiring mortgage loans and issuing the certificates.
Additional research is available on http://www.moodys.com.
New York
Jay A. Siegel
Managing Director
Structured Finance Group
Moody's Investors Service
JOURNALISTS: 212-553-0376
SUBSCRIBERS: 212-553-1653
New York
Bruce D. Fabrikant
Senior Vice President
Structured Finance Group
Moody's Investors Service
JOURNALISTS: 212-553-0376
SUBSCRIBERS: 212-553-1653