Fitch Affirms 32 Classes from 3 MASTR SLT Securitizations

NEW YORK--(Business Wire)--Fitch has affirmed the following three UBS Mortgage Asset
Securitization Transactions (MASTR) Specialized Loan Trust (MASTR SLT)
mortgage pass-through certificates:

Series 2006-1

--Class A affirmed at 'AAA';

--Class M-1 affirmed at 'AA';

--Class M-2 affirmed at 'A';

--Class M-3 affirmed at 'A-';

--Class M-4 affirmed at 'BBB+';

--Class M-5 affirmed at 'BBB';

--Class M-6 affirmed at 'BBB-';

--Class M-7 affirmed at 'BB+;

--Class M-8 affirmed at 'BB'.

Series 2006-2

--Class A affirmed at 'AAA';

--Class M-1 affirmed at 'AA+';

--Class M-2 affirmed at 'AA';

--Class M-3 affirmed at 'AA-';

--Class M-4 affirmed at 'A+';

--Class M-5 affirmed at 'A';

--Class M-6 affirmed at 'A-';

--Class M-7 affirmed at 'BBB+;

--Class M-8 affirmed at 'BBB';

--Class M-9 affirmed at 'BBB-;

--Class B-1 affirmed at 'BB+'.

Series 2006-3

--Class A affirmed at 'AAA';

--Class M-1 affirmed at 'AA+';

--Class M-2 affirmed at 'AA';

--Class M-3 affirmed at 'AA-';

--Class M-4 affirmed at 'A+';

--Class M-5 affirmed at 'A';

--Class M-6 affirmed at 'A-';

--Class M-7 affirmed at 'BBB+;

--Class M-8 affirmed at 'BBB';

--Class M-9 affirmed at 'BBB-;

--Class B-1 affirmed at 'BB+';

--Class B-2 affirmed at 'BB'.

The affirmations affect approximately $464 million of the
outstanding certificates and reflect a stable relationship between
credit enhancement (CE) and expected loss.

The collateral of the above transactions primarily consists of
fixed-rate and adjustable-rate mortgage loans secured by first and
second liens on one- to four-family residential properties. The loans
were acquired by UBS from various originators. The collateral
initially included delinquent loans, performing bankruptcy loans,
foreclosure loans, and loans that have had prior delinquencies. Wells
Fargo Bank, N.A., rated 'RMS1' by Fitch, is the master servicer for
all of the above transactions.

The pool factors (i.e., current mortgage loans outstanding as a
percentage of the initial pool) range from 53% (2006-1) to 75%
(2006-3). The transactions are seasoned from 14 months (2006-3) to 22
months (2006-1). Further information regarding current delinquency,
loss and CE statistics is available on the Fitch Ratings web site at
www.fitchratings.com.

Fitch's rating definitions and the terms of use of such ratings
are available on the agency's public site, www.fitchratings.com.
Published ratings, criteria and methodologies are available from this
site, at all times. Fitch's code of conduct, confidentiality,
conflicts of interest, affiliate firewall, compliance and other
relevant policies and procedures are also available from the 'Code of
Conduct' section of this site.

Fitch Ratings, New York
Michele Patterson, +1-212-908-0779
Vincent Barberio, +1-212-908-0505
Sandro Scenga, +1-212-908-0278 (Media Relations)

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