10-D 1 mam07hf1_10d-200710.txt UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D.C. 20549 FORM 10-D ASSET-BACKED ISSUER DISTRIBUTION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the monthly distribution period from: September 26, 2007 to October 25, 2007 Commission File Number of issuing entity: 333-130373-27 MASTR Adjustable Rate Mortgages Trust 2007-HF1 (Exact name of issuing entity as specified in its charter) Commission File Number of depositor: 333-130373 Mortgage Asset Securitization Transactions, Inc. (Exact name of depositor as specified in its charter) UBS Real Estate Securities Inc. (Exact name of sponsor as specified in its charter) New York (State or other jurisdiction of incorporation or organization of the issuing entity) 54-2199649 54-2199650 54-2199651 54-2199652 54-2199716 (I.R.S. Employer Identification No.) c/o Wells Fargo Bank, N.A. 9062 Old Annapolis Road Columbia, MD 21045 (Address of principal executive offices of the issuing entity) (Zip Code) (410) 884-2000 (Telephone number, including area code) Not Applicable (Former name, former address, if changed since last report) Registered/reporting pursuant to (check one) Title of Section Section Section Name of Exchange Class 12(b) 12(g) 15(d) (If Section 12(b)) A-1 _____ _____ __X___ ____________ A-2 _____ _____ __X___ ____________ M-1 _____ _____ __X___ ____________ M-2 _____ _____ __X___ ____________ M-3 _____ _____ __X___ ____________ M-4 _____ _____ __X___ ____________ M-5 _____ _____ __X___ ____________ M-6 _____ _____ __X___ ____________ M-7 _____ _____ __X___ ____________ M-8 _____ _____ __X___ ____________ C _____ _____ __X___ ____________ P _____ _____ __X___ ____________ R _____ _____ __X___ ____________ R-X _____ _____ __X___ ____________

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes __X__ No ____ Part I - DISTRIBUTION INFORMATION Item 1. Distribution and Pool Performance Information On October 25, 2007 a distribution was made to holders of MASTR Adjustable Rate Mortgages Trust 2007-HF1. The distribution report is attached as an Exhibit to this Form 10-D. Please see Item 9(b), Exhibit 99.1 for the related information. Part II - OTHER INFORMATION Item 9. Exhibits. (a) The following is a list of documents filed as part of this Report on Form 10-D: (99.1) Monthly report distributed to holders of MASTR Adjustable Rate Mortgages Trust 2007-HF1, relating to the October 25, 2007 distribution. (b) The exhibits required to be filed by the Registrant pursuant to this Form are listed above and in the Exhibit Index that immediately follows the signature page hereof. 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 thereunto duly authorized. MASTR Adjustable Rate Mortgages Trust 2007-HF1 (Issuing Entity) Wells Fargo Bank, N.A. (Master Servicer) /s/ Elisabeth A. Brewster Elisabeth A. Brewster, Vice President Date: November 6, 2007 EXHIBIT INDEX Exhibit Number Description EX-99.1 Monthly report distributed to holders of MASTR Adjustable Rate Mortgages Trust 2007-HF1, relating to the October 25, 2007 distribution. EX-99.1 MASTR Adjustable Rate Mortgages Trust Mortgage Pass-Through Certificates Distribution Date: 10/25/2007 MASTR Adjustable Rate Mortgages Trust Mortgage Pass-Through Certificates Series 2007-HF1 Contact: Customer Service - CTSLink Wells Fargo Bank, N.A. Securities Administration Services 8480 Stagecoach Circle Frederick, MD 21701-4747 www.ctslink.com Telephone: 1-866-846-4526 Fax: 240-586-8675

Certificateholder Distribution Summary Class CUSIP Record Certificate Beginning Interest Date Pass-Through Certificate Distribution Rate Balance A-1 57645RAA9 0610/2224/2007 5.~~56000~~37125% ~~540~~479,~~151~~646,~~415~~652.2752 2,~~586~~146,~~124~~918.9440 A-2 57645RAB7 0610/2224/2007 5.~~60000~~41125% 6053,~~016~~293,~~387~~684.3079 ~~289~~240,~~412~~321.3621 M-1 57645RAC5 0610/2224/2007 5.~~82000~~63125% 11,042,000.00 5551,~~338~~816.8289 M-2 57645RAD3 0610/2224/2007 5.~~87000~~68125% 4,223,000.00 2119,~~346~~993.0927 M-3 57645RAE1 0610/2224/2007 65.~~02000~~83125% 3,248,000.00 1615,~~837~~783.2725 M-4 57645RAF8 0610/2224/2007 65.~~02000~~83125% 3,247,000.00 1615,~~832~~778.0939 M-5 57645RAG6 0610/2224/2007 65.~~02000~~83125% 3,248,000.00 1615,~~837~~783.2725 M-6 57645RAH4 0610/2224/2007 65.~~02000~~83125% 3,248,000.00 1615,~~837~~783.2725 M-7 57645RAJ0 0610/2224/2007 6.~~82000~~63125% 3,248,000.00 1917,~~074~~948.7858 M-8 57645RAK7 0610/2224/2007 6.~~82000~~63125% 3,247,000.00 1917,~~068~~943.9106 C 57645RAL5 0509/3128/2007 0.00000% 3,897,479.12 ~~529~~464,~~020~~580.0807 P 57645RAM3 0509/3128/2007 0.00000% 100.00 346,~~922~~027.8380 R 57645RAN1 0509/3128/2007 0.00000% 0.00 0.00 R-X 57645RAP6 0509/3128/2007 0.00000% 0.00 0.00 Totals ~~638~~571,~~816~~588,~~381~~916.6943 3,~~621~~028,~~652~~677.7142

Certificateholder Distribution Summary (continued) Class Principal Current Ending Total Cumulative Distribution Realized Certificate Distribution Realized Loss Balance Losses A-1 81,~~558~~742,~~314~~851.9115 0.00 ~~531~~477,~~593~~903,~~100~~801.3637 113,~~144~~889,~~439~~769.8555 0.00 A-2 ~~950~~193,~~916~~648.9672 0.00 5953,~~065~~100,~~470~~036.3407 1433,~~240,329~~969.3293 0.00 M-1 0.00 0.00 11,042,000.00 5551,~~338~~816.8289 0.00 M-2 0.00 0.00 4,223,000.00 2119,~~346~~993.0927 0.00 M-3 0.00 0.00 3,248,000.00 1615,~~837~~783.2725 0.00 M-4 0.00 0.00 3,247,000.00 1615,~~832~~778.0939 0.00 M-5 0.00 0.00 3,248,000.00 1615,~~837~~783.2725 0.00 M-6 0.00 0.00 3,248,000.00 1615,~~837~~783.2725 0.00 M-7 0.00 0.00 3,248,000.00 1917,~~074~~948.7858 0.00 M-8 0.00 0.00 3,247,000.00 1917,~~068~~943.9106 0.00 C 0.00 0.00 3,897,479.12 ~~529~~464,~~020~~580.0807 0.00 P 0.00 0.00 100.00 346,~~922~~027.8380 0.00 R 0.00 0.00 0.00 0.00 0.00 R-X 0.00 0.00 0.00 0.00 0.00 Totals 91,~~509~~936,~~231~~499.87 0.00 ~~629~~569,~~307~~652,~~149~~416.8256 134,~~130~~965,~~884~~177.5829 0.00 As Master Servicer, Wells Fargo Bank, N.A. has independently calculated collateral information based on loan level data received from external parties, which may include the Servicers, Issuer and other parties to the transaction. Wells Fargo Bank, N.A. expressly disclaims any responsibility for the accuracy or completeness of information furnished to it by those third parties. All Record Dates are based upon the governing documents and logic set forth as of closing.

Principal Distribution Statement Class Original Beginning Scheduled UnScheduled Accretion Face Certificate Principal Principal Amount Balance Distribution Distribution A-1 549,832,000.00 ~~540~~479,~~151~~646,~~415~~652.2752 0.00 81,~~558~~742,~~314~~851.9115 0.00 A-2 61,092,000.00 6053,~~016~~293,~~387~~684.3079 0.00 ~~950~~193,~~916~~648.9672 0.00 M-1 11,042,000.00 11,042,000.00 0.00 0.00 0.00 M-2 4,223,000.00 4,223,000.00 0.00 0.00 0.00 M-3 3,248,000.00 3,248,000.00 0.00 0.00 0.00 M-4 3,247,000.00 3,247,000.00 0.00 0.00 0.00 M-5 3,248,000.00 3,248,000.00 0.00 0.00 0.00 M-6 3,248,000.00 3,248,000.00 0.00 0.00 0.00 M-7 3,248,000.00 3,248,000.00 0.00 0.00 0.00 M-8 3,247,000.00 3,247,000.00 0.00 0.00 0.00 C 3,904,852.63 3,897,479.12 0.00 0.00 0.00 P 100.00 100.00 0.00 0.00 0.00 R 0.00 0.00 0.00 0.00 0.00 R-X 0.00 0.00 0.00 0.00 0.00 Totals 649,579,952.63 ~~638~~571,~~816~~588,~~381~~916.6943 0.00 91,~~509~~936,~~231~~499.87 0.00

Principal Distribution Statement (continued) Class Realized Total Ending Ending Total Loss Principal Certificate Certificate Principal Reduction Balance Percentage Distribution A-1 0.00 81,~~558~~742,~~314~~851.9115 ~~531~~477,~~593~~903,~~100~~801.3637 0.~~96682823~~86918150 81,~~558~~742,~~314~~851.9115 A-2 0.00 ~~950~~193,~~916~~648.9672 5953,~~065~~100,~~470~~036.3407 0.~~96682823~~86918150 ~~950~~193,~~916~~648.9672 M-1 0.00 0.00 11,042,000.00 1.00000000 0.00 M-2 0.00 0.00 4,223,000.00 1.00000000 0.00 M-3 0.00 0.00 3,248,000.00 1.00000000 0.00 M-4 0.00 0.00 3,247,000.00 1.00000000 0.00 M-5 0.00 0.00 3,248,000.00 1.00000000 0.00 M-6 0.00 0.00 3,248,000.00 1.00000000 0.00 M-7 0.00 0.00 3,248,000.00 1.00000000 0.00 M-8 0.00 0.00 3,247,000.00 1.00000000 0.00 C 0.00 0.00 3,897,479.12 0.99811171 0.00 P 0.00 0.00 100.00 1.00000000 0.00 R 0.00 0.00 0.00 0.00000000 0.00 R-X 0.00 0.00 0.00 0.00000000 0.00 Totals $0.00 91,~~509~~936,~~231~~499.87 ~~629~~569,~~307~~652,~~149~~416.8256 0.~~96879090~~87695504 91,~~509~~936,~~231~~499.87

Principal Distribution Factors Statement Class Original Beginning Scheduled UnScheduled Accretion Face Certificate Principal Principal Amount Balance Distribution Distribution A-1 549,832,000.00 ~~982~~872.~~39355889~~35128643 0.00000000 153.~~56532706~~16978850 0.00000000 A-2 61,092,000.00 ~~982~~872.~~39355889~~35128642 0.00000000 153.~~56532705~~16978852 0.00000000 M-1 11,042,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 M-2 4,223,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 M-3 3,248,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 M-4 3,247,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 M-5 3,248,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 M-6 3,248,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 M-7 3,248,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 M-8 3,247,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 C 3,904,852.63 998.11170595 0.00000000 0.00000000 0.00000000 P 100.00 1000.00000000 0.00000000 0.00000000 0.00000000 R 0.00 0.00000000 0.00000000 0.00000000 0.00000000 R-X 0.00 0.00000000 0.00000000 0.00000000 0.00000000

Principal Distribution Factors Statement (continued) Class Realized Total Ending Ending Total Loss Principal Certificate Certificate Principal Reduction Balance Percentage Distribution A-1 0.00000000 153.~~56532706~~16978850 ~~966~~869.~~82823182~~18149793 0.~~96682823~~86918150 153.~~56532706~~16978850 A-2 0.00000000 153.~~56532705~~16978852 ~~966~~869.~~82823185~~18149790 0.~~96682823~~86918150 153.~~56532705~~16978852 M-1 0.00000000 0.00000000 1000.00000000 1.00000000 0.00000000 M-2 0.00000000 0.00000000 1000.00000000 1.00000000 0.00000000 M-3 0.00000000 0.00000000 1000.00000000 1.00000000 0.00000000 M-4 0.00000000 0.00000000 1000.00000000 1.00000000 0.00000000 M-5 0.00000000 0.00000000 1000.00000000 1.00000000 0.00000000 M-6 0.00000000 0.00000000 1000.00000000 1.00000000 0.00000000 M-7 0.00000000 0.00000000 1000.00000000 1.00000000 0.00000000 M-8 0.00000000 0.00000000 1000.00000000 1.00000000 0.00000000 C 0.00000000 0.00000000 998.11170595 0.99811171 0.00000000 P 0.00000000 0.00000000 1000.00000000 1.00000000 0.00000000 R 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 R-X 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 NOTE: All classes per $1,000 denomination.

Interest Distribution Statement Class Accrual Accrual Current Beginning Current Payment of Dates Days Certificate Certificate/ Accrued Unpaid Interest Rate Notional Interest Shortfall (1) Balance A-1 0509/25/07 - 0610/24/07 3130 5.~~56000~~37125% ~~540~~479,~~151~~646,~~415~~652.2752 2,~~586~~146,~~124~~918.9440 0.00 A-2 0509/25/07 - 0610/24/07 3130 5.~~60000~~41125% 6053,~~016~~293,~~387~~684.3079 ~~289~~240,~~412~~321.3621 0.00 M-1 0509/25/07 - 0610/24/07 3130 5.~~82000~~63125% 11,042,000.00 5551,~~338~~816.8289 0.00 M-2 0509/25/07 - 0610/24/07 3130 5.~~87000~~68125% 4,223,000.00 2119,~~346~~993.0927 0.00 M-3 0509/25/07 - 0610/24/07 3130 65.~~02000~~83125% 3,248,000.00 1615,~~837~~783.2725 0.00 M-4 0509/25/07 - 0610/24/07 3130 65.~~02000~~83125% 3,247,000.00 1615,~~832~~778.0939 0.00 M-5 0509/25/07 - 0610/24/07 3130 65.~~02000~~83125% 3,248,000.00 1615,~~837~~783.2725 0.00 M-6 0509/25/07 - 0610/24/07 3130 65.~~02000~~83125% 3,248,000.00 1615,~~837~~783.2725 0.00 M-7 0509/25/07 - 0610/24/07 3130 6.~~82000~~63125% 3,248,000.00 1917,~~074~~948.7858 ~~838~~769.4056 M-8 0509/25/07 - 0610/24/07 3130 6.~~82000~~63125% 3,247,000.00 1917,~~068~~943.9106 ~~838~~769.1433 C N/A N/A 0.00000% ~~638~~571,~~816~~588,~~281~~816.6843 0.00 0.00 P N/A N/A 0.00000% 100.00 0.00 0.00 R N/A N/A 0.00000% 0.00 0.00 0.00 R-X N/A N/A 0.00000% 0.00 0.00 0.00 Totals 32,~~057~~558,~~709~~069.8055 1,~~676~~538.5489

Interest Distribution Statement (continued) Class Current Non-Supported Total Remaining Ending Interest Interest Interest Unpaid Interest Certificate/ Shortfall(1) Shortfall Distribution Shortfall(1) Notional Balance A-1 0.00 0.00 2,~~586~~146,~~124~~918.9440 0.00 ~~531~~477,~~593~~903,~~100~~801.3637 A-2 0.00 0.00 ~~289~~240,~~412~~321.3621 0.00 5953,~~065~~100,~~470~~036.3407 M-1 0.00 0.00 5551,~~338~~816.8289 0.00 11,042,000.00 M-2 0.00 0.00 2119,~~346~~993.0927 0.00 4,223,000.00 M-3 0.00 0.00 1615,~~837~~783.2725 0.00 3,248,000.00 M-4 0.00 0.00 1615,~~832~~778.0939 0.00 3,247,000.00 M-5 0.00 0.00 1615,~~837~~783.2725 0.00 3,248,000.00 M-6 0.00 0.00 1615,~~837~~783.2725 0.00 3,248,000.00 M-7 ~~838~~769.4056 0.00 1917,~~074~~948.7858 0.00 3,248,000.00 M-8 ~~838~~769.1433 0.00 1917,~~068~~943.9106 0.00 3,247,000.00 C 0.00 0.00 ~~529~~464,~~020~~580.0807 0.00 ~~629~~569,~~307~~652,~~049~~316.8156 P 0.00 0.00 346,~~922~~027.8380 0.00 100.00 R 0.00 0.00 0.00 0.00 0.00 R-X 0.00 0.00 0.00 0.00 0.00 Totals 1,~~676~~538.5489 0.00 3,~~621~~028,~~652~~677.7142 0.00 (1) Amount also includes Coupon Cap or Basis Risk Shortfalls, if applicable.

Interest Distribution Factors Statement Class Original Current Beginning Current Payment of Face Certificate Certificate/ Accrued Unpaid Interest Amount Rate Notional Interest Shortfall (1) Balance A-1 549,832,000.00 5.~~56000~~37125% ~~982~~872.~~39355889~~35128643 43.~~70348205~~90468070 0.00000000 A-2 61,092,000.00 5.~~60000~~41125% ~~982~~872.~~39355889~~35128642 43.~~73732011~~93375908 0.00000000 M-1 11,042,000.00 5.~~82000~~63125% 1000.00000000 54.~~01166636~~69270875 0.00000000 M-2 4,223,000.00 5.~~87000~~68125% 1000.00000000 54.~~05472176~~73437604 0.00000000 M-3 3,248,000.00 65.~~02000~~83125% 1000.00000000 54.~~18388855~~85937500 0.00000000 M-4 3,247,000.00 65.~~02000~~83125% 1000.00000000 54.~~18388974~~85937481 0.00000000 M-5 3,248,000.00 65.~~02000~~83125% 1000.00000000 54.~~18388855~~85937500 0.00000000 M-6 3,248,000.00 65.~~02000~~83125% 1000.00000000 54.~~18388855~~85937500 0.00000000 M-7 3,248,000.00 6.~~82000~~63125% 1000.00000000 5.~~87277709~~52604064 0.~~25812808~~23693350 M-8 3,247,000.00 6.~~82000~~63125% 1000.00000000 5.~~87277795~~52604250 0.~~25812750~~23693563 C 3,904,852.63 0.00000% ~~163595~~146379.~~49058834~~10072166 0.00000000 0.00000000 P 100.00 0.00000% 1000.00000000 0.00000000 0.00000000 R 0.00 0.00000% 0.00000000 0.00000000 0.00000000 R-X 0.00 0.00000% 0.00000000 0.00000000 0.00000000

Interest Distribution Factors Statement (continued) Class Current Non-Supported Total Remaining Unpaid Ending Interest Interest Interest Interest Certificate/ Shortfall(1) Shortfall Distribution Shortfall(1) Notional Balance A-1 0.00000000 0.00000000 43.~~70348205~~90468070 0.00000000 ~~966~~869.~~82823182~~18149793 A-2 0.00000000 0.00000000 43.~~73732011~~93375908 0.00000000 ~~966~~869.~~82823185~~18149790 M-1 0.00000000 0.00000000 54.~~01166636~~69270875 0.00000000 1000.00000000 M-2 0.00000000 0.00000000 54.~~05472176~~73437604 0.00000000 1000.00000000 M-3 0.00000000 0.00000000 54.~~18388855~~85937500 0.00000000 1000.00000000 M-4 0.00000000 0.00000000 54.~~18388974~~85937481 0.00000000 1000.00000000 M-5 0.00000000 0.00000000 54.~~18388855~~85937500 0.00000000 1000.00000000 M-6 0.00000000 0.00000000 54.~~18388855~~85937500 0.00000000 1000.00000000 M-7 0.~~25812808~~23693350 0.00000000 5.~~87277709~~52604064 0.00000000 1000.00000000 M-8 0.~~25812750~~23693563 0.00000000 5.~~87277795~~52604250 0.00000000 1000.00000000 C 0.00000000 0.00000000 ~~135~~118.~~47760444~~97505848 0.00000000 ~~161160~~145883.~~25608116~~17935061 P 0.00000000 0.00000000 ~~349228~~60278.~~30000000~~00000000 0.00000000 1000.00000000 R 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 R-X 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 (1) Amount also includes Coupon Cap or Basis Risk Shortfalls, if applicable. NOTE: All classes per $1,000 denomination.

Certificateholder Account Statement CERTIFICATE ACCOUNT Beginning Balance 0.00 Deposits Payments of Interest and Principal 134,~~070~~890,~~895~~126.2736 Reserve Funds and Credit Enhancements 0.00 Proceeds from Repurchased Loans 0.00 Servicer Advances ~~240~~414,~~857~~672.0749 Gains & Subsequent Recoveries (Realized Losses) 0.00 Prepayment Penalties 346,~~922~~027.8380 Swap/Cap Payments 0.00 Total Deposits 135,~~346~~310,~~675~~826.1765 Withdrawals Swap Payments 1155,~~378~~623.0451 Reserve Funds and Credit Enhancements 0.00 Total Administration Fees ~~214~~190,~~412~~025.5585 Payment of Interest and Principal 134,~~130~~965,~~884~~177.5829 Total Withdrawals (Pool Distribution Amount) 135,~~346~~310,~~675~~826.1765 Ending Balance 0.00 Servicer Advances are calculated as delinquent scheduled principal and interest.

ADMINISTRATION FEES Gross Servicing Fee* ~~183~~164,~~916~~356.2551 Lender Paid Mortgage Insurance 3025,~~496~~669.3034 Supported Prepayment/Curtailment Interest Shortfall 0.00 Total Administration Fees ~~214~~190,~~412~~025.5585 *Servicer Payees include: ~~CENLAR FSB;~~ CHASE HOME FINANCE LLC; DOWNEY SAVINGS AND LOAN ASSOCIATION; ~~GMAC MORTGAGE CORPORATION;~~ MID AMERICA BANK, FSB; WELLS FARGO BANK, N.A.

Reserve and Guaranty Funds Account Name Beginning Current Current Ending Balance Withdrawals Deposits Balance Cap Account - The Bank of New York 1,000.00 0.00 0.00 1,000.00 Swap Account - The Bank of New York 1,000.00 0.00 0.00 1,000.00 Hedge Funds Account Name Funds In (A) Funds Out(B) Net Amount(A - B) Cap 1 Contract - The Bank of New York 0.00 0.00 0.00 Cap 2 Contract - The Bank of New York 0.00 0.00 0.00 Cap 3 Contract - The Bank of New York 0.00 0.00 0.00 Cap 4 Contract - The Bank of New York 0.00 0.00 0.00 Swap Agreement - The Bank of New York 2,~~840~~165,~~838~~540.0469 2,~~842~~321,~~216~~164.0820 (1155,~~378~~623.0451)

Collateral Statement Group Group 1 Group 2 Collateral Description Mixed ARM Mixed ARM Weighted Average Coupon Rate 76.~~053670~~979983 7.~~433177~~368176 Weighted Average Net Rate 6.~~678822~~605152 7.~~183177~~118176 Weighted Average Pass-Through Rate 6.~~627190~~555325 7.~~107503~~051316 Weighted Average Remaining Term ~~356~~ 352 348 Principal And Interest Constant 2,~~956~~608,~~261~~158.3017 1935,~~033,492~~017.5217 Beginning Loan Count 1,~~285~~157 ~~463~~413 Loans Paid in Full 154 95 Ending Loan Count 1,~~270~~153 ~~454~~408 Beginning Scheduled Balance ~~488~~435,~~555~~233,~~464~~286.2183 ~~150~~136,~~260~~355,~~817~~529.4760 Ending Scheduled Balance ~~482~~434,~~957~~201,~~656~~881.6122 ~~146~~135,~~349~~450,~~393~~435.2034 Actual Ending Collateral Balance ~~483~~434,~~038~~297,~~561~~406.9060 ~~146~~135,~~435~~544,~~800~~402.9707 Scheduled Principal 8476,~~503~~557.7434 ~~102~~97,~~729~~774.8626 Unscheduled Principal 5954,~~513,303~~848.8627 3807,~~808,694~~320.4100 Negative Amortized Principal 0.00 0.00 Scheduled Interest 2,~~871~~531,~~757~~600.5683 ~~930~~837,~~762~~242.6691 Servicing Fees ~~152~~135,~~611~~949.9111 3128,~~304~~407.3440 Master Servicing Fees 0.00 0.00 Trustee Fee 0.00 0.00 FRY Amount 0.00 0.00 Special Hazard Fee 0.00 0.00 Other Fee 2118,~~020~~072.6912 97,~~475~~597.6122 Pool Insurance Fee 0.00 0.00 Spread 1 0.00 0.00 Spread 2 0.00 0.00 Spread 3 0.00 0.00 Net Interest 2,~~698~~377,~~124~~579.9660 ~~889~~801,~~982~~238.7129 Realized Loss Amount 0.00 0.00 Cumulative Realized Loss 0.00 0.00 Percentage of Cumulative Losses 0.0000 0.0000 Prepayment Penalty Waived Amount 0.00 0.00 Prepayment Penalty Waived Count 0 0 Prepayment Penalty Paid Amount 344,~~922~~770.8300 01,257.0080 Prepayment Penalty Paid Count 41 02 Special Servicing Fee 0.00 0.00

Collateral Statement Group Total Collateral Description Mixed ARM Weighted Average Coupon Rate 7.~~142937~~072589 Weighted Average Net Rate 6.~~740167~~673645 Weighted Average Pass-Through Rate 6.~~740167~~673645 Weighted Average Remaining Term ~~355~~351 Principal And Interest Constant 3,~~989~~543,~~753~~175.8234 Beginning Loan Count 1,~~748~~570 Loans Paid in Full 249 Ending Loan Count 1,~~724~~561 Beginning Scheduled Balance ~~638~~571,~~816~~588,~~281~~816.6843 Ending Scheduled Balance ~~629~~569,~~307~~652,~~049~~316.8156 Actual Ending Collateral Balance ~~629~~569,~~474~~841,~~362~~808.8767 Scheduled Principal ~~187~~174,~~233~~331.60 Unscheduled Principal 91,~~321~~762,~~998~~168.27 Negative Amortized Principal 0.00 Scheduled Interest 3,~~802~~368,~~520~~843.2274 Servicing Fees ~~183~~164,~~916~~356.2551 Master Servicing Fees 0.00 Trustee Fee 0.00 FRY Amount 0.00 Special Hazard Fee 0.00 Other Fee 3025,~~496~~669.3034 Pool Insurance Fee 0.00 Spread 1 0.00 Spread 2 0.00 Spread 3 0.00 Net Interest 3,~~588~~178,~~107~~817.6789 Realized Loss Amount 0.00 Cumulative Realized Loss 0.00 Percentage of Cumulative Losses 0.0000 Prepayment Penalty Waived Amount 0.00 Prepayment Penalty Waived Count 0 Prepayment Penalty Paid Amount 346,~~922~~027.8380 Prepayment Penalty Paid Count 43 Special Servicing Fee 0.00

Additional Reporting - Deal Level Informational Reporting Modification Percentage 0.000000% Senior Enhancement % 6.~~141434~~784573% Stepdown Date in Effect? NO Miscellaneous Reporting Adjusted Net Maximum WAC 10.~~764965~~690327% Adjusted Net Rate Cap 10.~~415202~~363609% Net Maximum WAC 6.~~520239~~346929% Net Rate Cap 10.~~764965~~690327% Net WAC 6.~~740169~~673646% Structural Reporting Net Monthly Excess Cashflow ~~532~~466,~~074~~118.6696 Extra Principal Distribution Amount 0.00 Overcollateralization Floor 3,247,899.26 Overcollateralization Amount 3,897,479.12 Overcollateralization Deficiency Amount 0.00 Overcollateralization Surplus Amount 0.00 Overcollateralization Target Amount 3,897,479.12 Trigger Event Reporting Delinquency Trigger Event Trigger Result Pass Threshold Value 2.~~600897~~873267% Calculated Value 03.~~168301~~874736% Cumulative Loss Trigger Event Trigger Result Pass Threshold Value 0.250000% Calculated Value 0.000000% Trigger Event Trigger Result N/A

Delinquency Status - MBA Delinquency Calculation Method DELINQUENT BANKRUPTCY FORECLOSURE REO Total No. of Loans No. of Loans No. of Loans No. of Loans No. of Loans Actual Balance Actual Balance Actual Balance Actual Balance Actual Balance 0-29 Days 01 0 0 01 0316,800.00 0.00 0.00 0316,800.00 30 Days 8682 0 0 0 8682 3128,~~623~~554,~~084~~903.8344 0.00 0.00 0.00 3128,~~623~~554,~~084~~903.8344 60 Days 137 0 0 0 137 ~~656~~11,~~000~~084,390.0061 0.00 0.00 0.00 ~~656~~11,~~000~~084,390.0061 90 Days 029 01 0 0 030 09,429,285.0043 0286,413.0046 0.00 0.00 09,715,698.0089 120 Days 0 0 014 0 014 0.00 0.00 06,314,032.0049 0.00 06,314,032.0049 150 Days 0 0 08 0 08 0.00 0.00 03,987,698.0054 0.00 03,987,698.0054 180+ Days 0 01 012 0 013 0.00 0120,000.00 04,825,433.0037 0.00 04,945,433.0037 Totals 87148 03 034 0 87185 3249,~~279~~068,~~084~~579.8348 0723,213.0046 015,127,164.0040 0.00 3264,~~279~~918,~~084~~957.8334 No. of Loans No. of Loans No. of Loans No. of Loans No. of Loans Actual Balance Actual Balance Actual Balance Actual Balance Actual Balance 0-29 Days 0.~~000000~~064061% 0.000000% 0.000000% 0.~~000000~~064061% 0.~~000000~~055594% 0.000000% 0.000000% 0.~~000000~~055594% 30 Days 45.~~988399~~253043% 0.000000% 0.000000% 0.000000% 45.~~988399~~253043% 5.~~023729~~011023% 0.000000% 0.000000% 0.000000% 5.~~023729~~011023% 60 Days 02.~~058005~~370275% 0.000000% 0.000000% 0.000000% 02.~~058005~~370275% 01.~~104214~~945170% 0.000000% 0.000000% 0.000000% 01.~~104214~~945170% 90 Days 01.~~000000~~857783% 0.~~000000~~064061% 0.000000% 0.000000% 01.~~000000~~921845% 01.~~000000~~654720% 0.~~000000~~050262% 0.000000% 0.000000% 01.~~000000~~704982% 120 Days 0.000000% 0.000000% 0.~~000000~~896861% 0.000000% 0.~~000000~~896861% 0.000000% 0.000000% 01.~~000000~~108033% 0.000000% 01.~~000000~~108033% 150 Days 0.000000% 0.000000% 0.~~000000~~512492% 0.000000% 0.~~000000~~512492% 0.000000% 0.000000% 0.~~000000~~699790% 0.000000% 0.~~000000~~699790% 180+ Days 0.000000% 0.~~000000~~064061% 0.~~000000~~768738% 0.000000% 0.~~000000~~832799% 0.000000% 0.~~000000~~021058% 0.~~000000~~846802% 0.000000% 0.~~000000~~867861% Totals 59.~~046404~~481102% 0.~~000000~~192184% 02.~~000000~~178091% 0.000000% 511.~~046404~~851377% 58.~~127943~~610912% 0.~~000000~~126915% 02.~~000000~~654625% 0.000000% 511.~~127943~~392452% Please refer to CTSLink.com for a list of delinquency code descriptions.

Current Period Class A Insufficient Funds 0.00 Principal Balance of Contaminated Properties 0.00 Periodic Advance ~~240~~414,~~857~~672.0749

Delinquency Status By Group DELINQUENT BANKRUPTCY FORECLOSURE REO Total Group 1 - MBA No. of Loans No. of Loans No. of Loans No. of Loans No. of Loans Actual Balance Actual Balance Actual Balance Actual Balance Actual Balance 0-29 Days 01 0 0 01 0316,800.00 0.00 0.00 0316,800.00 30 Days 6567 0 0 0 6567 2625,~~436~~065,~~558~~411.0023 0.00 0.00 0.00 2625,~~436~~065,~~558~~411.0023 60 Days 128 0 0 0 128 ~~656~~9,~~000~~081,497.0096 0.00 0.00 0.00 ~~656~~9,~~000~~081,497.0096 90 Days 027 01 0 0 028 08,783,128.0038 0286,413.0046 0.00 0.00 09,069,541.0084 120 Days 0 0 09 0 09 0.00 0.00 03,903,928.0032 0.00 03,903,928.0032 150 Days 0 0 05 0 05 0.00 0.00 02,420,498.0054 0.00 02,420,498.0054 180+ Days 0 01 09 0 010 0.00 0120,000.00 03,903,095.0026 0.00 04,023,095.0026 Totals 66122 03 023 0 66148 2742,~~092~~930,~~558~~037.0057 0723,213.0046 010,227,522.0012 0.00 2753,~~092~~880,~~558~~773.0015 0-29 Days 0.~~000000~~086730% 0.000000% 0.000000% 0.~~000000~~086730% 0.~~000000~~072945% 0.000000% 0.000000% 0.~~000000~~072945% 30 Days 5.~~118110~~810928% 0.000000% 0.000000% 0.000000% 5.~~118110~~810928% 5.~~472971~~771485% 0.000000% 0.000000% 0.000000% 5.~~472971~~771485% 60 Days 02.~~078740~~428448% 0.000000% 0.000000% 0.000000% 02.~~078740~~428448% 02.~~135807~~091078% 0.000000% 0.000000% 0.000000% 02.~~135807~~091078% 90 Days 02.~~000000~~341717% 0.~~000000~~086730% 0.000000% 0.000000% 02.~~000000~~428448% 02.~~000000~~022376% 0.~~000000~~065949% 0.000000% 0.000000% 02.~~000000~~088325% 120 Days 0.000000% 0.000000% 0.~~000000~~780572% 0.000000% 0.~~000000~~780572% 0.000000% 0.000000% 0.~~000000~~898907% 0.000000% 0.~~000000~~898907% 150 Days 0.000000% 0.000000% 0.~~000000~~433651% 0.000000% 0.~~000000~~433651% 0.000000% 0.000000% 0.~~000000~~557337% 0.000000% 0.~~000000~~557337% 180+ Days 0.000000% 0.~~000000~~086730% 0.~~000000~~780572% 0.000000% 0.~~000000~~867303% 0.000000% 0.~~000000~~027631% 0.~~000000~~898715% 0.000000% 0.~~000000~~926346% Totals 510.~~196850~~581093% 0.~~000000~~260191% 01.~~000000~~994796% 0.000000% 512.~~196850~~836080% 59.~~608777~~884940% 0.~~000000~~166525% 02.~~000000~~354958% 0.000000% 512.~~608777~~406423% DELINQUENT BANKRUPTCY FORECLOSURE REO Total Group 2 - MBA No. of Loans No. of Loans No. of Loans No. of Loans No. of Loans Actual Balance Actual Balance Actual Balance Actual Balance Actual Balance 0-29 Days 0 0 0 0 0.00 0.00 0.00 0.00 30 Days 2115 0 0 0 2115 53,~~186~~489,~~526~~492.8321 0.00 0.00 0.00 53,~~186~~489,~~526~~492.8321 60 Days 09 0 0 0 09 02,002,892.0065 0.00 0.00 0.00 02,002,892.0065 90 Days 02 0 0 0 02 0646,157.0005 0.00 0.00 0.00 0646,157.0005 120 Days 0 0 05 0 05 0.00 0.00 02,410,104.0017 0.00 02,410,104.0017 150 Days 0 0 03 0 03 0.00 0.00 01,567,200.00 0.00 01,567,200.00 180+ Days 0 0 03 0 03 0.00 0.00 0922,338.0011 0.00 0922,338.0011 Totals 2126 0 011 0 2137 56,~~186~~138,~~526~~541.8391 0.00 04,899,642.0028 0.00 511,~~186~~038,~~526~~184.8319 0-29 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 30 Days 43.~~625551~~676471% 0.000000% 0.000000% 0.000000% 43.~~625551~~676471% 32.~~541843~~574427% 0.000000% 0.000000% 0.000000% 32.~~541843~~574427% 60 Days 02.~~000000~~205882% 0.000000% 0.000000% 0.000000% 02.~~000000~~205882% 01.~~000000~~477665% 0.000000% 0.000000% 0.000000% 01.~~000000~~477665% 90 Days 0.~~000000~~490196% 0.000000% 0.000000% 0.000000% 0.~~000000~~490196% 0.~~000000~~476712% 0.000000% 0.000000% 0.000000% 0.~~000000~~476712% 120 Days 0.000000% 0.000000% 01.~~000000~~225490% 0.000000% 01.~~000000~~225490% 0.000000% 0.000000% 01.~~000000~~778092% 0.000000% 01.~~000000~~778092% 150 Days 0.000000% 0.000000% 0.~~000000~~735294% 0.000000% 0.~~000000~~735294% 0.000000% 0.000000% 01.~~000000~~156226% 0.000000% 01.~~000000~~156226% 180+ Days 0.000000% 0.000000% 0.~~000000~~735294% 0.000000% 0.~~000000~~735294% 0.000000% 0.000000% 0.~~000000~~680469% 0.000000% 0.~~000000~~680469% Totals 46.~~625551~~372549% 0.000000% 02.~~000000~~696078% 0.000000% 49.~~625551~~068627% 34.~~541843~~528805% 0.000000% 03.~~000000~~614788% 0.000000% 38.~~541843~~143593% Please refer to CTSLink.com for a list of delinquency code descriptions.

Foreclosure Detail - All Mortgage Loans in Foreclosure during Current Period

Summary 12 Month Foreclosure ~~Detail~~History* -New ~~All~~Foreclosure ~~Mortgage~~Loans Month Foreclosure Percentage Loans in Foreclosure ~~during~~7 Nov-06 0.000% Original Principal Balance 3,168,550.00 Dec-06 0.000% Current ~~Period~~Actual ~~Summary~~Balance 3,167,692.39 Jan-07 No0.000% Feb-07 0.000% Current Foreclosure ~~Information~~Total toMar-07 0.000% Loans in Foreclosure 34 Apr-07 0.000% Original Principal Balance 15,137,500.00 May-07 0.000% Current Actual Balance 15,127,164.40 Jun-07 0.000% Jul-07 0.000% Aug-07 0.140% Sep-07 2.092% Oct-07 2.655% *The text reported in the above table is presented graphically on the monthly bond remittance report. ~~this~~The ~~period~~monthly bond remittance report can be viewed online at www.ctslink.com. Group 1 12 Month Foreclosure History* New Foreclosure Loans Month Foreclosure Percentage Loans in Foreclosure 6 Nov-06 No0.000% Original Principal Balance 2,893,350.00 Dec-06 0.000% Current Actual Balance 2,892,492.39 Jan-07 0.000% Feb-07 0.000% Current Foreclosure ~~Information~~Total toMar-07 0.000% Loans in Foreclosure 23 Apr-07 0.000% Original Principal Balance 10,233,700.00 May-07 0.000% Current Actual Balance 10,227,522.12 Jun-07 0.000% Jul-07 0.000% Aug-07 0.000% Sep-07 1.685% Oct-07 2.355% *The text reported in the above table is presented graphically on the monthly bond remittance report. ~~this~~The ~~period~~monthly bond remittance report can be viewed online at www.ctslink.com. Group 2 12 Month Foreclosure History* New Foreclosure Loans Month Foreclosure Percentage Loans in Foreclosure 1 Nov-06 No0.000% Original Principal Balance 275,200.00 Dec-06 0.000% Current Actual Balance 275,200.00 Jan-07 0.000% Feb-07 0.000% Current Foreclosure ~~Information~~Total toMar-07 0.000% Loans in Foreclosure 11 Apr-07 0.000% Original Principal Balance 4,903,800.00 May-07 0.000% Current Actual Balance 4,899,642.28 Jun-07 0.000% Jul-07 0.000% Aug-07 0.589% Sep-07 3.389% Oct-07 3.615% *The text reported in the above table is presented graphically on the monthly bond remittance report. ~~this~~The ~~period~~monthly bond remittance report can be viewed online at www.ctslink.com.

Foreclosure Loan Detail - All Mortgage Loans in Foreclosure during Current Period Month Loan First Original Loan Entered Payment LTV at Principal Group Number FC Date State Origination Balance NoGroup ~~Foreclosure~~1 ~~Loans~~0000008418 ~~this~~Oct-2007 ~~Period~~01-Feb-2007 FL 80.00 1,600,000.00 Group 1 0000742295 Oct-2007 01-Apr-2007 AZ 80.00 236,800.00 Group 1 0000CGS765 Sep-2007 01-Apr-2007 CA 74.10 452,000.00 Group 1 0006100402 Sep-2007 01-Jan-2007 IL 71.94 999,950.00 Group 1 0152506619 Oct-2007 01-Mar-2007 FL 95.00 227,050.00 Group 1 0262464961 Oct-2007 01-Dec-2006 FL 95.00 142,500.00 Group 1 0303219842 Sep-2007 01-Jan-2007 FL 75.00 184,875.00 Group 1 0334738053 Sep-2007 01-Jan-2007 CA 80.00 310,800.00 Group 1 0586060076 Sep-2007 01-Jan-2007 UT 75.00 480,000.00 Group 1 0777028878 Sep-2007 01-Feb-2007 CA 80.00 480,000.00 Group 1 0777031241 Sep-2007 01-Mar-2007 FL 75.00 184,875.00 Group 1 0777031966 Oct-2007 01-Mar-2007 GA 90.00 135,000.00 Group 1 1616010471 Sep-2007 01-Feb-2007 MN 75.00 352,425.00 Group 1 1616010473 Sep-2007 01-Feb-2007 MN 75.00 350,175.00 Group 1 1616010475 Sep-2007 01-Feb-2007 MN 75.00 347,925.00 Group 1 1616010477 Sep-2007 01-Feb-2007 MN 75.00 353,925.00 Group 1 1625001225 Sep-2007 01-Mar-2007 NY 75.00 825,000.00 Group 1 2200106870 Sep-2007 01-Dec-2006 TX 80.00 352,000.00 Group 1 2200187116 Sep-2007 01-Feb-2007 CA 80.00 520,000.00 Group 1 2200217036 Oct-2007 01-Mar-2007 FL 80.00 552,000.00 Group 1 5949884891 Sep-2007 01-Feb-2007 FL 80.00 424,000.00 Group 1 7700206969 Sep-2007 01-Feb-2007 NV 80.00 350,400.00 Group 1 7700206983 Sep-2007 01-Feb-2007 NV 80.00 372,000.00 Group 2 0006120700 Sep-2007 01-Mar-2007 FL 80.00 764,000.00 Group 2 0025030067 Sep-2007 01-Mar-2007 AZ 90.00 223,200.00 Group 2 0063442464 Sep-2007 01-Sep-2006 FL 62.94 107,000.00 Group 2 0070130000 Sep-2007 01-Mar-2007 FL 80.00 720,000.00 Group 2 0906100479 Aug-2007 01-Feb-2007 CA 80.00 336,000.00 Group 2 1591004081 Sep-2007 01-Apr-2007 MA 80.00 268,000.00 Group 2 1592006319 Aug-2007 01-Feb-2007 NJ 80.00 476,000.00 Group 2 1592006480 Sep-2007 01-Mar-2007 NE 80.00 110,400.00 Group 2 1625001400 Sep-2007 01-Apr-2007 NY 80.00 624,000.00 Group 2 5908108331 Sep-2007 01-Feb-2007 FL 71.43 1,000,000.00 Group 2 606161583C Oct-2007 01-Aug-2006 WI 80.00 275,200.00

Foreclosure Loan Detail - All Mortgage Loans in Foreclosure during Current Period (continued) Current Paid Current Approximate Loan Actual To Months Loan Delinquent Group Number Balance Date Delinquent Rate Interest NoGroup ~~Foreclosure~~1 ~~Loans~~0000008418 ~~this~~1,600,000.00 ~~Period~~01-May-2007 4 7.750% 58,999.98 Group 1 0000742295 236,512.07 01-May-2007 4 8.500% 9,599.36 Group 1 0000CGS765 452,000.00 01-Apr-2007 5 8.500% 18,362.52 Group 1 0006100402 999,647.93 01-Mar-2007 6 7.250% 34,362.90 Group 1 0152506619 226,944.07 01-Mar-2007 6 9.750% 9,600.72 Group 1 0262464961 142,036.25 01-May-2007 4 9.125% 5,570.22 Group 1 0303219842 184,667.02 01-May-2007 4 8.875% 7,845.62 Group 1 0334738053 310,699.47 01-May-2007 4 6.340% 9,267.13 Group 1 0586060076 478,854.16 01-Apr-2007 5 8.625% 19,722.37 Group 1 0777028878 480,000.00 01-Apr-2007 5 7.500% 17,100.00 Group 1 0777031241 184,644.38 01-Apr-2007 5 8.375% 7,374.02 Group 1 0777031966 135,000.00 01-May-2007 4 9.625% 5,528.22 Group 1 1616010471 351,840.71 01-Mar-2007 6 8.250% 13,821.84 Group 1 1616010473 349,594.42 01-Mar-2007 6 8.250% 13,733.60 Group 1 1616010475 347,339.11 01-Mar-2007 6 8.125% 13,427.64 Group 1 1616010477 353,329.02 01-Mar-2007 6 8.125% 13,659.19 Group 1 1625001225 825,000.00 01-Apr-2007 5 7.625% 29,906.28 Group 1 2200106870 352,000.00 01-May-2007 4 7.500% 12,540.00 Group 1 2200187116 520,000.00 01-May-2007 4 7.125% 17,550.00 Group 1 2200217036 552,000.00 01-Mar-2007 6 8.250% 21,735.00 Group 1 5949884891 423,013.51 01-May-2007 4 8.750% 17,697.79 Group 1 7700206969 350,400.00 01-Mar-2007 6 7.375% 12,264.00 Group 1 7700206983 372,000.00 01-Mar-2007 6 7.375% 13,020.00 Group 2 0006120700 764,000.00 01-May-2007 4 8.625% 31,992.48 Group 2 0025030067 223,200.00 01-Apr-2007 5 8.563% 9,277.32 Group 2 0063442464 105,481.27 01-May-2007 4 8.125% 4,148.55 Group 2 0070130000 720,000.00 01-Apr-2007 5 7.750% 27,000.00 Group 2 0906100479 336,000.00 01-Mar-2007 6 8.250% 13,440.00 Group 2 1591004081 268,000.00 01-May-2007 4 8.500% 11,055.00 Group 2 1592006319 476,000.00 01-Mar-2007 6 7.875% 18,147.48 Group 2 1592006480 110,338.11 01-Mar-2007 6 8.875% 4,748.81 Group 2 1625001400 624,000.00 01-Apr-2007 5 8.250% 24,959.79 Group 2 5908108331 997,422.90 01-May-2007 4 8.250% 39,857.27 Group 2 606161583C 275,200.00 01-May-2007 4 8.000% 10,664.04

Bankruptcy Detail - All Mortgage Loans in Bankruptcy during Current Period

Summary 12 Month Bankruptcy ~~Detail~~History* -New ~~All~~Bankruptcy ~~Mortgage~~Loans Month Bankruptcy Percentage Loans in Bankruptcy ~~during~~1 Nov-06 0.000% Original Principal Balance 288,000.00 Dec-06 0.000% Current ~~Period~~Actual ~~Summary~~Balance 286,413.46 Jan-07 No0.000% Feb-07 0.000% Current Bankruptcy ~~Information~~Total toMar-07 0.000% Loans in Bankruptcy 3 Apr-07 0.000% Original Principal Balance 724,800.00 May-07 0.000% Current Actual Balance 723,213.46 Jun-07 0.000% Jul-07 0.054% Aug-07 0.090% Sep-07 0.076% Oct-07 0.127% *The text reported in the above table is presented graphically on the monthly bond remittance report. ~~this~~The ~~period~~monthly bond remittance report can be viewed online at www.ctslink.com. Group 1 12 Month Bankruptcy History* New Bankruptcy Loans Month Bankruptcy Percentage Loans in Bankruptcy 1 Nov-06 No0.000% Original Principal Balance 288,000.00 Dec-06 0.000% Current Actual Balance 286,413.46 Jan-07 0.000% Feb-07 0.000% Current Bankruptcy ~~Information~~Total toMar-07 0.000% Loans in Bankruptcy 3 Apr-07 0.000% Original Principal Balance 724,800.00 May-07 0.000% Current Actual Balance 723,213.46 Jun-07 0.000% Jul-07 0.071% Aug-07 0.072% Sep-07 0.100% Oct-07 0.167% *The text reported in the above table is presented graphically on the monthly bond remittance report. ~~this~~The ~~period~~monthly bond remittance report can be viewed online at www.ctslink.com. Group 2 12 Month Bankruptcy History* New Bankruptcy Loans Month Bankruptcy Percentage Loans in Bankruptcy 0 Nov-06 No0.000% Original Principal Balance 0.00 Dec-06 0.000% Current Actual Balance 0.00 Jan-07 0.000% Feb-07 0.000% Current Bankruptcy ~~Information~~Total toMar-07 0.000% Loans in Bankruptcy 0 Apr-07 0.000% Original Principal Balance 0.00 May-07 0.000% Current Actual Balance 0.00 Jun-07 0.000% Jul-07 0.000% Aug-07 0.149% Sep-07 0.000% Oct-07 0.000% *The text reported in the above table is presented graphically on the monthly bond remittance report. ~~this~~The ~~period~~monthly bond remittance report can be viewed online at www.ctslink.com.

Bankruptcy Detail - All Mortgage Loans in Bankruptcy during Current Period Group Loan Month Loan First State LTV at Original Number Entered Payment Origination Principal Bankruptcy Date Balance NoGroup ~~Bankruptcy~~1 ~~Loans~~0061204000 ~~this~~Jul-2007 ~~Period~~01-Feb-2007 FL 80.00 316,800.00 Group 1 0334738052 Oct-2007 01-Jan-2007 MA 80.00 288,000.00 Group 1 0777032553 Sep-2007 01-Apr-2007 TN 80.00 120,000.00

Bankruptcy Detail - All Mortgage Loans in Bankruptcy during Current Period (continued) Group Loan Current Paid To Months Current Approximate Number Actual Date Delinquent Loan Rate Delinquent Balance Interest NoGroup ~~Bankruptcy~~1 ~~Loans~~0061204000 ~~this~~316,800.00 ~~Period~~01-Sep-2007 0 7.500% 3,762.00 Group 1 0334738052 286,413.46 01-Jun-2007 3 6.490% 7,290.67 Group 1 0777032553 120,000.00 01-Mar-2007 6 7.875% 4,489.03

Prepayment Detail - Prepayments during Current Period Summary Loans Paid In Full Repurchased Loans Original Current Original Current Principal Scheduled Principal Scheduled Group Count Balance Balance Count Balance Balance Group 1 154 5921,~~484,664~~200.00 5918,~~477,836~~016.4842 0 0.00 0.00 Group 2 95 3801,~~806,907~~480.00 3797,~~799,061~~421.6991 0 0.00 0.00 Total 24 9 1,~~291~~722,~~571~~680.00 91,~~276~~715,~~898~~438.1733 0 0.00 0.00

Prepayment Detail - Prepayments during Current Period (continued) Summary Substitution Loans Liquidated Loans Curtailments Original Current Original Current Principal Scheduled Principal Scheduled Curtailment Group Count Balance Balance Count Balance Balance Amount Group 1 0 0.00 0.00 0 0.00 0.00 3637,~~995~~134.8070 Group 2 0 0.00 0.00 0 0.00 0.00 1210,~~296~~465.2765 Total 0 0.00 0.00 0 0.00 0.00 4947,~~292~~600.0735

Prepayment Loan Detail - Prepayments during Current Period First Original Loan LTV at Payment Principal Prepayment Group Number State Origination Date Balance Amount Group 1 ~~0000JC1656~~0000508009 ~~NJ 90.00 01-Feb-2007 558,200.00 558,200.00 Group 1 0001453074~~ FL 80.00 01-~~Dec~~Nov-~~2006~~2005 ~~428~~352,000.00 ~~428~~351,~~000~~737.0020 Group 1 ~~0021079659~~00R0611354 ~~FL 95.00 01-Apr-2007 290,690.00 290,184.60 Group 1 0130347768~~ CA 6772.9529 01-~~Feb~~Nov-~~2007 265,000.00 264,946.00 Group 1 0334738170 MI 80.00 01-Feb-2007 64,024.00 63,785.34 Group 1 0777026486 CO 64.62 01-Dec-~~2006 ~~168,000.00 166,945.11 Group 1 0777027621 IL 78.79 01-Jan-2007 1,~~300,000.00 1297,~~294,939~~366.~~90 Group 1 0777030349 CO~~ 89~~.49~~ ~~01-Feb-2007 438,500.00 438,500.00~~ Group 1 ~~0777030374~~0117782006 COMD 8095.00 01-Mar-2007 ~~536~~110,~~800~~200.00 ~~536~~109,~~800~~609.0048 Group 1 ~~0777031072~~2200109013 SCID 9079.0050 01-~~Feb~~Dec-~~2007~~2006 ~~238~~159,~~500.00 238,500.00 Group 1 0777031988 FL 80.00 01-Apr-2007 208,~~000.00 ~~208~~159,000.00 Group 12 ~~0777032215~~0606080706 ~~TN 85.00 01-Apr-2007 153,000.00 153,000.00 Group 1 1595000830 AZ 94.99 01-Jan-2007 193,550.00 192,767.66 Group 1 2200174999 CA 72.29 01-Feb-2007 404,800.00 404,799.99 Group 1 2200207180~~ IL 80.00 01-~~Mar~~Aug-~~2007~~2006 ~~237~~142,~~600~~400.00 ~~236~~141,~~939~~231.~~46 Group 2 0000004431 UT 80.00 01-Mar-2007 193,157.00 192,620.~~03 Group 2 ~~0020060936~~0777026341 NJVA 6595.00 01-~~Mar~~Nov-~~2007~~2006 ~~406~~64,~~250~~600.00 ~~405~~64,~~091~~600.~~92 Group 2 0020060937 NJ 65.~~00 ~~01-Mar-2007 305,500.00 304,629.14~~ Group 2 ~~0020060939~~0777026342 NJVA 6595.00 01-~~Mar~~Nov-~~2007~~2006 ~~650~~61,~~000~~180.00 ~~648,147.09 Group 2 0020060941 NJ 65.00 01-Mar-2007 695,500.00 693,517.38 Group 2 0020060983 NJ~~ 61~~.86 01-Mar-2007 448~~,~~500~~180.00 ~~447,221.49~~ Group 2 ~~0777032032~~0777031037 TXFL 9590.00 01-~~Apr~~Mar-2007 8078,~~750~~300.00 8077,~~614~~840.9972 Group 2 ~~0777032395~~9033005810 TXCA 9050.0056 01-Apr-2007 ~~697~~455,~~250.00 695,906.96 Group 2 610185784C IL 75.00 01-Jan-2007 330,~~000.00 ~~328~~452,~~649~~002.1460

Prepayment Loan Detail - Prepayments during Current Period (continued) Current Loan PIF Months Loan Original Group Number Type Delinquent Rate Term Seasoning Group 1 ~~0000JC1656~~0000508009 Loan Paid in Full ~~0 7.625% 360 4 Group~~ (1) ~~0001453074 Loan Paid in Full 0 8.250% 360~~ 6 ~~Group 1 0021079659 Loan Paid in Full 0 8~~.~~750~~500% 360 223 Group 1 ~~0130347768~~00R0611354 Loan Paid in Full 0 7.~~125~~750% 360 411 Group 1 ~~0334738170~~0117782006 Loan Paid in Full 0 ~~7.540% 360 4 Group 1 0777026486 Loan Paid in Full 0 6.625% 360 6 Group 1 0777027621 Loan Paid in Full 0~~ 8.~~250~~125% 360 ~~5 Group 1 0777030349 Loan Paid in Full 0~~ 7~~.313%~~ ~~360 4~~ Group 1 ~~0777030374~~2200109013 Loan Paid in Full 0 7.~~625% 360 3 Group 1 0777031072 Loan Paid in Full (1) 7.688% 360 4 Group 1 0777031988 Loan Paid in Full (1) 8.~~500% 360 210 Group ~~1 0777032215 Loan Paid in Full 0 6.875% 360~~ 2 ~~Group~~0606080706 ~~1 1595000830~~ Loan Paid in Full 0 89.~~063~~250% 360 514 Group 12 ~~2200174999~~0777026341 Loan Paid in Full 0 59.~~875~~313% 360 411 Group ~~1 2200207180 Loan Paid in Full 1 7.875% 360 3 Group~~ 2 ~~0000004431~~0777026342 Loan Paid in Full 0 79.~~875~~313% 360 311 Group 2 ~~0020060936~~0777031037 Loan Paid in Full (1) 7.750% 360 3 Group 2 0020060937 Loan Paid in Full (1) 7.750% 360 3 Group 2 0020060939 Loan Paid in Full (1) 7.750% 360 3 Group 2 0020060941 Loan Paid in Full (1) 7.750% 360 3 Group 2 0020060983 Loan Paid in Full (1) 7.750% 360 3 Group 2 0777032032 Loan Paid in Full 0 8.~~938~~500% 360 27 Group 2 ~~0777032395~~9033005810 Loan Paid in Full ~~1 8.250% 360 2 Group 2 610185784C Loan Paid in Full~~ 0 86.~~000~~375% 360 56

Prepayment Penalty Detail - Prepayment Penalty Paid during Current Period Prepayment Prepayment Summary Loan Prior Penalty Penalty Count Balance Amount Waived Group 1 4 1 159,~~168,833~~000.6700 344,~~922~~770.8300 0.00 Group 2 02 0125,780.00 01,257.0080 0.00 Total 43 1284,~~168,833~~780.6700 346,~~922~~027.8380 0.00

Prepayment Penalty Loan Detail - Prepayment Penalty Paid during Current Period Paid In Prepayment Prepayment Loan Full Prior Penalty Penalty Group Number Date Balance Amount Waived Group 1 ~~0001453074~~2200109013 0509/0124/2007 ~~428~~159,000.00 144,~~124~~770.00 0.00 Group 12 ~~0334738170~~0777026341 0509/14/2007 6364,~~833~~600.~~67 638.82 0.~~00 ~~Group 1 0777030349 05/17/2007 438,500~~646.00 ~~12,826.13~~ 0.00 Group 12 ~~0777031072~~0777026342 0509/1114/2007 ~~238~~61,~~500~~180.00 ~~7,333~~611.8880 0.00

Prepayment Rates

Summary SMM CPR PSA Current Month 10.~~460~~308% Current Month 163.~~176~~639% Current Month ~~1,969~~225.~~503~~220% 3 Month Average 0.~~000~~977% 3 Month Average 010.~~000~~952% 3 Month Average 0828.~~000~~889% 12 Month Average 0.000% 12 Month Average 0.000% 12 Month Average 0.000% CPR: Current vs. 12mo Average* PSA: Current vs. 12mo Average* Month Current 12mo Avg. Month Current 12mo Avg. ~~Jul~~Nov-2006 N/A N/A ~~Jul~~Nov-2006 N/A N/A ~~Aug~~Dec-2006 N/A N/A ~~Aug~~Dec-2006 N/A N/A ~~Sep~~Jan-~~2006~~2007 N/A N/A ~~Sep~~Jan-~~2006~~2007 N/A N/A ~~Oct~~Feb-~~2006~~2007 N/A N/A ~~Oct~~Feb-~~2006~~2007 N/A N/A ~~Nov~~Mar-~~2006~~2007 N/A N/A ~~Nov~~Mar-~~2006~~2007 N/A N/A ~~Dec~~Apr-~~2006~~2007 N/A N/A ~~Dec~~Apr-~~2006~~2007 N/A N/A ~~Jan~~May-2007 ~~N/A~~17.882% N/A ~~Jan~~May-2007 ~~N/A~~2,884.118% N/A ~~Feb~~Jun-2007 ~~N/A~~16.176% N/A ~~Feb~~Jun-2007 ~~N/A~~1,969.503% N/A ~~Mar~~Jul-2007 ~~N/A~~56.259% N/A ~~Mar~~Jul-2007 ~~N/A~~5,527.542% N/A ~~Apr~~Aug-2007 ~~N/A~~17.281% N/A ~~Apr~~Aug-2007 ~~N/A~~1,419.583% N/A ~~May~~Sep-2007 1711.~~882~~936% N/A ~~May~~Sep-2007 ~~2,884~~841.~~118~~862% N/A ~~Jun~~Oct-2007 163.~~176~~639% N/A ~~Jun~~Oct-2007 ~~1,969~~225.~~503~~220% N/A *The text reported in the above table is presented *The text reported in the above table is presented graphically on the monthly bond remittance report. The graphically on the monthly bond remittance report. The monthly bond remittance report can be viewed online at monthly bond remittance report can be viewed online at www.ctslink.com. www.ctslink.com. Group 1 SMM CPR PSA Current Month 10.~~129~~219% Current Month 122.~~734~~602% Current Month ~~1,624~~164.~~990~~868% 3 Month Average 0.~~000~~999% 3 Month Average 011.~~000~~124% 3 Month Average 0874.~~000~~397% 12 Month Average 0.000% 12 Month Average 0.000% 12 Month Average 0.000% CPR: Current vs. 12mo Average* PSA: Current vs. 12mo Average* Month Current 12mo Avg. Month Current 12mo Avg. ~~Jul~~Nov-2006 N/A N/A ~~Jul~~Nov-2006 N/A N/A ~~Aug~~Dec-2006 N/A N/A ~~Aug~~Dec-2006 N/A N/A ~~Sep~~Jan-~~2006~~2007 N/A N/A ~~Sep~~Jan-~~2006~~2007 N/A N/A ~~Oct~~Feb-~~2006~~2007 N/A N/A ~~Oct~~Feb-~~2006~~2007 N/A N/A ~~Nov~~Mar-~~2006~~2007 N/A N/A ~~Nov~~Mar-~~2006~~2007 N/A N/A ~~Dec~~Apr-~~2006~~2007 N/A N/A ~~Dec~~Apr-~~2006~~2007 N/A N/A ~~Jan~~May-2007 ~~N/A~~21.033% N/A ~~Jan~~May-2007 ~~N/A~~3,601.053% N/A ~~Feb~~Jun-2007 ~~N/A~~12.734% N/A ~~Feb~~Jun-2007 ~~N/A~~1,624.990% N/A ~~Mar~~Jul-2007 ~~N/A~~59.614% N/A ~~Mar~~Jul-2007 ~~N/A~~6,084.792% N/A ~~Apr~~Aug-2007 ~~N/A~~18.735% N/A ~~Apr~~Aug-2007 ~~N/A~~1,586.869% N/A ~~May~~Sep-2007 2112.~~033~~034% N/A ~~May~~Sep-2007 ~~3,601~~871.~~053~~453% N/A ~~Jun~~Oct-2007 122.~~734~~602% N/A ~~Jun~~Oct-2007 ~~1,624~~164.~~990~~868% N/A *The text reported in the above table is presented *The text reported in the above table is presented graphically on the monthly bond remittance report. The graphically on the monthly bond remittance report. The monthly bond remittance report can be viewed online at monthly bond remittance report can be viewed online at www.ctslink.com. www.ctslink.com. Group 2 SMM CPR PSA Current Month 20.~~536~~592% Current Month 266.~~531~~883% Current Month ~~2,805~~396.~~421~~476% 3 Month Average 0.~~000~~906% 3 Month Average 010.~~000~~319% 3 Month Average 0695.~~000~~427% 12 Month Average 0.000% 12 Month Average 0.000% 12 Month Average 0.000% CPR: Current vs. 12mo Average* PSA: Current vs. 12mo Average* Month Current 12mo Avg. Month Current 12mo Avg. ~~Jul~~Nov-2006 N/A N/A ~~Jul~~Nov-2006 N/A N/A ~~Aug~~Dec-2006 N/A N/A ~~Aug~~Dec-2006 N/A N/A ~~Sep~~Jan-~~2006~~2007 N/A N/A ~~Sep~~Jan-~~2006~~2007 N/A N/A ~~Oct~~Feb-~~2006~~2007 N/A N/A ~~Oct~~Feb-~~2006~~2007 N/A N/A ~~Nov~~Mar-~~2006~~2007 N/A N/A ~~Nov~~Mar-~~2006~~2007 N/A N/A ~~Dec~~Apr-~~2006~~2007 N/A N/A ~~Dec~~Apr-~~2006~~2007 N/A N/A ~~Jan~~May-2007 ~~N/A~~6.656% N/A ~~Jan~~May-2007 ~~N/A~~903.421% N/A ~~Feb~~Jun-2007 ~~N/A~~26.531% N/A ~~Feb~~Jun-2007 ~~N/A~~2,805.421% N/A ~~Mar~~Jul-2007 ~~N/A~~43.280% N/A ~~Mar~~Jul-2007 ~~N/A~~3,796.671% N/A ~~Apr~~Aug-2007 ~~N/A~~12.451% N/A ~~Apr~~Aug-2007 ~~N/A~~932.936% N/A ~~May~~Sep-2007 611.~~656~~622% N/A ~~May~~Sep-2007 ~~903~~756.~~421~~869% N/A ~~Jun~~Oct-2007 266.~~531~~883% N/A ~~Jun~~Oct-2007 ~~2,805~~396.~~421~~476% N/A *The text reported in the above table is presented *The text reported in the above table is presented graphically on the monthly bond remittance report. The graphically on the monthly bond remittance report. The monthly bond remittance report can be viewed online at monthly bond remittance report can be viewed online at www.ctslink.com. www.ctslink.com. Calculation Methodology: Single Month Mortality (SMM): (Partial and full prepayments + Repurchases) / (Beginning Scheduled Balance - Scheduled Principal) Conditional PrePayment Rate (CPR): 1 - ((1 - SMM)^12) PSA Standard Prepayment Model: 100 * CPR / (0.2 * MIN(30,WAS)) Weighted Average Seasoning (WAS): sum((Original Term - Remaining Term)*(Current Scheduled Balance/Deal Scheduled Principal Balance))

Repurchases ~~Current~~Due to Breaches Beginning Loan Scheduled Payoff Current Current Number Balance Balance Rate Payment No Repurchases Due to Breaches this Period

~~Breaches~~Repurchases ~~Current~~Due to Other Beginning Loan Scheduled Payoff Current Current Number Balance Balance Rate Payment No ~~Breaches~~Repurchases Due to Other this Period

Interest Rate Stratification Summary Group 1 Current Number of Outstanding Percentage of Number of Outstanding Percentage of Interest Rate Loans Scheduled Balance(%) Loans Scheduled Balance(%) Range(%) Balance($) Balance($) < 4.500 0 0.00 0.000 0 0.00 0.000 4.500 4.999 0 0.00 0.000 0 0.00 0.000 5.000 5.499 8 3,~~732~~730,~~937~~225.0421 0.~~593~~655 8 3,~~732~~730,~~937~~225.0421 0.~~773~~859 5.500 5.999 105 5655,~~034~~571,~~715~~852.2109 89.~~904~~755 96 5150,~~420~~999,~~455~~125.7039 1011.~~647~~745 6.000 6.499 ~~235~~230 ~~118~~115,~~405~~726,~~133~~871.6238 1820.~~815~~315 ~~185~~181 8785,~~008~~061,~~022~~052.8995 1819.~~016~~590 6.500 6.999 ~~295~~281 ~~124~~117,~~016~~762,~~186~~553.4912 1920.~~707~~673 ~~262~~248 ~~104~~98,~~213~~041,~~486~~204.1426 2122.~~578~~580 7.000 7.499 ~~261~~235 8674,~~776~~984,~~550~~753.7385 13.~~789~~163 ~~205~~182 7160,~~150~~145,~~919~~456.8884 1413.~~732~~852 7.500 7.999 ~~340~~299 ~~112~~95,~~373~~869,~~416~~761.1497 1716.~~857~~830 ~~242~~210 8873,~~031~~882,~~842~~220.7733 1817.~~228~~016 8.000 8.499 ~~226~~192 6756,~~172~~926,~~836~~600.0703 109.~~674~~993 ~~140~~118 4335,~~366~~784,~~654~~042.1959 8.~~979~~241 8.500 8.999 ~~187~~157 4838,~~061~~451,~~595~~466.0306 76.~~637~~750 ~~102~~85 2821,~~019~~854,~~416~~156.2790 5.~~802~~033 9.000 9.499 4738 98,~~735~~094,~~829~~285.1360 1.~~547~~421 2017 43,~~605~~583,~~476~~020.4562 0.~~954~~825 9.500 9.999 1411 21,~~143~~776,~~661~~275.1002 0.~~341~~312 75 ~~917~~630,~~317~~649.7626 0.~~190~~145 10.000 10.499 65 ~~854~~757,~~189~~672.2523 0.~~136~~133 3 ~~491~~490,~~127~~726.5287 0.~~102~~113 >= 10.500 0 0.00 0.000 0 0.00 0.000 Total 1,~~724~~561 ~~629~~569,~~307~~652,~~049~~316.8156 100.000 1,~~270~~153 ~~482~~434,~~957~~201,~~656~~881.6122 100.000

Interest Rate Stratification (continued) Group 2 Current Number of Outstanding Percentage of Interest Rate Loans Scheduled Balance(%) Range(%) Balance($) < 4.500 0 0.00 0.000 4.500 4.999 0 0.00 0.000 5.000 5.499 0 0.00 0.000 5.500 5.999 9 4,~~614~~572,~~259~~726.5170 3.~~153~~376 6.000 6.499 5049 3130,~~397~~665,~~110~~818.7343 2122.~~454~~640 6.500 6.999 33 19,~~802~~721,~~700~~348.3586 1314.~~531~~560 7.000 7.499 5653 1514,~~625~~839,~~630~~297.8501 10.~~677~~956 7.500 7.999 9889 2421,~~341~~987,~~573~~541.3764 16.~~633~~233 8.000 8.499 8674 2321,~~806~~142,~~181~~557.8844 1615.~~267~~609 8.500 8.999 8572 2016,~~042~~597,~~178~~309.7616 1312.~~695~~253 9.000 9.499 2721 54,~~130~~511,~~352~~264.6898 3.~~506~~331 9.500 9.999 76 1,~~226~~145,~~343~~625.3476 0.~~838~~846 10.000 10.499 32 ~~363~~266,~~061~~945.7336 0.~~248~~197 >= 10.500 0 0.00 0.000 Total ~~454~~408 ~~146~~135,~~349~~450,~~393~~435.2034 100.000

Filing Compare · MASTR Adjustable Rate Mortgages Trust 2007-HF1