~~Mortgage~~SECURITIES ~~Asset~~AND ~~Securitization~~EXCHANGE Transactions, Inc. Mortgage Pass-Through Certificates Record Date: 8/31/2004 Distribution Date: 9/27/2004 MASTR Series: 2004-9 Contact: Customer Service - CTSLink Wells Fargo Bank, N.A. Securities Administration Services 7485 New Horizon Way Frederick, MD 21703 Telephone: (301) 815-6600 Fax: (301) 815-6660 Certificateholder Distribution Summary Certificate Certificate Beginning Class Pass-Through Certificate Interest Principal Class CUSIP Description Rate Balance Distribution Distribution 1-A-1 57643MFC3 SEN 4.75000% 32,000,000.00 126,666.67 986,130.71 2-A-1 57643MFD1 ACCR 5.50000% 144,000,000.00 660,000.00 1,836,898.19 2-A-2 57643MFE9 ACCR 5.50000% 19,130,000.00 87,679.17 72,682.50 2-A-3 57643MFF6 SEQ 5.50000% 15,858,000.00 72,682.50 (72,682.50) 2-A-4 57643MFG4 LOCK 5.50000% 19,888,000.00 91,153.33 0.00 3-A-1 57643MFH2 SEQ 5.25000% 75,188,000.00 328,943.55 595,277.89 3-A-2 57643MFJ8 SEQ 5.25000% 20,000,000.00 87,498.95 158,343.86 3-A-3 57643MFK5 ACCR 5.25000% 7,682,000.00 33,608.35 43,749.48 3-A-4 57643MFL3 ACCR 5.25000% 10,779,508.00 47,159.78 0.00 3-A-5 57643MFM1 SEQ 5.25000% 10,000,000.00 43,749.48 (43,749.48) 3-A-6 57643MFN9 LOCK 5.25000% 12,000,000.00 52,499.37 0.00 3-A-7 57643MFP4 LOCK 5.25000% 2,264,000.00 9,904.88 0.00 4-A-1 57643MFQ2 SEN 6.00000% 115,000,000.00 575,000.00 2,868,524.83 5-A-1 57643MFR0 SEN 5.25000% 40,785,000.00 178,434.38 161,599.10 6-A-1 57643MFS8 SEN 5.00000% 65,000,000.00 270,833.33 272,469.35 7-A-1 57643MFT6 PO 6.32742% 50,450,000.00 266,015.47 946,279.35 8-A-1 57643MGF5 SEQ 5.14911% 14,108,000.00 60,536.40 403,616.35 8-A-2 57643MGG3 SEQ 5.14911% 74,996,000.00 321,802.39 0.00 PO 57643MFU3 PO 0.00000% 6,138,696.57 0.00 58,130.16 15-AX 57643MFV1 IO 5.00000% 0.00 10,148.88 0.00 30-AX 57643MFW9 IO 5.50000% 0.00 64,363.98 0.00 A-LR 57643MFX7 SEN 4.75000% 50.00 0.20 50.00 A-UR 57643MFY5 SEN 4.75000% 50.00 0.20 50.00 8-B-1 57643MGH1 SUB 5.14911% 634,000.00 2,720.45 2,341.28 8-B-2 57643MGJ7 SUB 5.14911% 181,000.00 776.66 668.41 8-B-3 57643MGK4 SUB 5.14911% 180,000.00 772.37 664.72 8-B-4 57643MGL2 SUB 5.14911% 181,000.00 776.66 668.41 8-B-5 57643MGM0 SUB 5.14911% 136,000.00 583.57 502.23 8-B-6 57643MGN8 SUB 5.14911% 45,781.52 196.45 169.07 15-B-1 57643MFZ2 SUB 5.36626% 966,000.00 4,319.84 3,975.60 15-B-2 57643MGA6 SUB 5.36626% 386,000.00 1,726.15 1,588.59 15-B-3 57643MGB4 SUB 5.36626% 290,000.00 1,296.85 1,193.50 15-B-4 57643MGP3 SUB 5.36626% 193,000.00 863.07 794.30 15-B-5 57643MGQ1 SUB 5.36626% 194,000.00 867.55 798.41 15-B-6 57643MGR9 SUB 5.36626% 96,783.46 432.80 398.32 30-B-1 57643MGC2 SUB 5.61912% 6,069,000.00 28,418.70 6,128.62 30-B-2 57643MGD0 SUB 5.61912% 1,969,000.00 9,220.04 1,988.34 30-B-3 57643MGE8 SUB 5.61912% 1,148,000.00 5,375.62 1,159.28 30-B-4 57643MGS7 SUB 5.61912% 656,000.00 3,071.79 662.44 30-B-5 57643MGT5 SUB 5.61912% 820,163.00 3,840.50 828.22 30-B-6 57643MGU2 SUB 5.61912% 492,799.80 2,307.58 497.64 Totals 749,905,832.35 3,456,247.91 8,312,397.17COMMISSION

~~Certificateholder Distribution Summary (continued) Current Ending Cumulative Realized Certificate Total Realized Class Loss Balance Distribution Losses 1-A-1 0.00 31~~Washington,~~013,869.29~~ ~~1,112,797~~D.~~38 0~~C.00 2-A-1 0.00 142,163,101.81 2,496,898.19 0.00 2-A-2 0.00 19,057,317.50 160,361.67 0.00 2-A-3 0.00 15,930,682.50 0.00 0.00 2-A-4 0.00 19,888,000.00 91,153.33 0.00 3-A-1 0.00 74,592,722.11 924,221.44 0.00 3-A-2 0.00 19,841,656.14 245,842.81 0.00 3-A-3 0.00 7,638,250.52 77,357.83 0.00 3-A-4 0.00 10,779,508.00 47,159.78 0.00 3-A-5 0.00 10,043,749.48 0.00 0.00 3-A-6 0.00 12,000,000.00 52,499.37 0.00 3-A-7 0.00 2,264,000.00 9,904.88 0.00 4-A-1 0.00 112,131,475.17 3,443,524.83 0.00 5-A-1 0.00 40,623,400.90 340,033.48 0.00 6-A-1 0.00 64,727,530.65 543,302.68 0.00 7-A-1 0.00 49,503,720.65 1,212,294.82 0.00 8-A-1 0.00 13,704,383.65 464,152.75 0.00 8-A-2 0.00 74,996,000.00 321,802.39 0.00 PO 0.00 6,080,566.41 58,130.16 0.00 15-AX 0.00 0.00 10,148.88 0.00 30-AX 0.00 0.00 64,363.98 0.00 A-LR 0.00 0.00 50.20 0.00 A-UR 0.00 0.00 50.20 0.00 8-B-1 0.00 631,658.72 5,061.73 0.00 8-B-2 0.00 180,331.59 1,445.07 0.00 8-B-3 0.00 179,335.28 1,437.09 0.00 8-B-4 0.00 180,331.59 1,445.07 0.00 8-B-5 0.00 135,497.77 1,085.80 0.00 8-B-6 0.00 45,612.45 365.52 0.00 15-B-1 0.00 962,024.40 8,295.44 0.00 15-B-2 0.00 384,411.41 3,314.74 0.00 15-B-3 0.00 288,806.50 2,490.35 0.00 15-B-4 0.00 192,205.70 1,657.37 0.00 15-B-5 0.00 193,201.59 1,665.96 0.00 15-B-6 0.00 96,385.14 831.12 0.00 30-B-1 0.00 6,062,871.38 34,547.32 0.00 30-B-2 0.00 1,967,011.66 11,208.38 0.00 30-B-3 0.00 1,146,840.72 6,534.90 0.00 30-B-4 0.00 655,337.56 3,734.23 0.00 30-B-5 0.00 819,334.78 4,668.72 0.00 30-B-6 0.00 492,302.16 2,805.22 0.00 Totals 0.00 741,593,435.18 11,768,645.08 0.00 All distributions required by the Pooling and Servicing Agreement have been calculated by the Certificate Administrator on behalf of the Trustee. 20549

~~Principal~~Form Distribution Statement Original Beginning Scheduled Unscheduled Face Certificate Principal Principal Realized Class Amount Balance Distribution Distribution Accretion Loss (1) 1-A-1 32,000,000.00 32,000,000.00 125,156.35 860,974.36 0.00 0.00 2-A-1 144,000,000.00 144,000,000.00 205,210.67 1,631,687.52 0.00 0.00 2-A-2 19,130,000.00 19,130,000.00 8~~,119.79 64,562.71 0.00 0.00 2~~-A-3 15,858,000.00 15,858,000.00 0.00 0.00 (72,682.50) 0.00 2-A-4 19,888,000.00 19,888,000.00 0.00 0.00 0.00 0.00 3-A-1 75,188,000.00 75,188,000.00 124,836.26 470,441.63 0.00 0.00 3-A-2 20,000,000.00 20,000,000.00 33,206.43 125,137.42 0.00 0.00 3-A-3 7,682,000.00 7,682,000.00 9,174.74 34,574.73 0.00 0.00 3-A-4 10,779,508.00 10,779,508.00 0.00 0.00 0.00 0.00 3-A-5 10,000,000.00 10,000,000.00 0.00 0.00 (43,749.48) 0.00 3-A-6 12,000,000.00 12,000,000.00 0.00 0.00 0.00 0.00 3-A-7 2,264,000.00 2,264,000.00 0.00 0.00 0.00 0.00 4-A-1 115,000,000.00 115,000,000.00 108,029.35 2,760,495.48 0.00 0.00 5-A-1 40,785,000.00 40,785,000.00 144,370.47 17,228.63 0.00 0.00 6-A-1 65,000,000.00 65,000,000.00 246,782.31 25,687.04 0.00 0.00 7-A-1 50,450,000.00 50,450,000.00 257,765.85 688,513.50 0.00 0.00 8-A-1 14,108,000.00 14,108,000.00 329,049.47 74,566.88 0.00 0.00 8-A-2 74,996,000.00 74,996,000.00 0.00 0.00 0.00 0.00 PO 6,138,696.57 6,138,696.57 14,744.25 43,385.90 0.00 0.00 15-AX 0.00 0.00 0.00 0.00 0.00 0.00 30-AX 0.00 0.00 0.00 0.00 0.00 0.00 A-LR 50.00 50.00 6.35 43.65 0.00 0.00 A-UR 50.00 50.00 6.35 43.65 0.00 0.00 8-B-1 634,000.00 634,000.00 2,341.28 0.00 0.00 0.00 8-B-2 181,000.00 181,000.00 668.41 0.00 0.00 0.00 8-B-3 180,000.00 180,000.00 664.72 0.00 0.00 0.00 8-B-4 181,000.00 181,000.00 668.41 0.00 0.00 0.00 8-B-5 136,000.00 136,000.00 502.23 0.00 0.00 0.00 8-B-6 45,781.52 45,781.52 169.07 0.00 0.00 0.00 30-B-1 6,069,000.00 6,069,000.00 6,128.62 0.00 0.00 0.00 30-B-2 1,969,000.00 1,969,000.00 1,988.34 0.00 0.00 0.00 30-B-3 1,148,000.00 1,148,000.00 1,159.28 0.00 0.00 0.00 30-B-4 656,000.00 656,000.00 662.44 0.00 0.00 0.00 30-B-5 820,163.00 820,163.00 828.22 0.00 0.00 0.00 30-B-6 492,799.80 492,799.80 497.64 0.00 0.00 0.00 Totals 747,780,048.89 747,780,048.89 1,622,737.30 6,797,343.10 (116,431.98) 0.00 (1) Amount Does Not Include Excess Special Hazard, Bankruptcy, or Fraud Losses Unless Otherwise Disclosed. Please Refer to the Prospectus Supplement for a Full Description.K

~~Principal~~CURRENT Distribution Statement (continued) Total Ending Ending Total Principal Certificate Certificate Principal Class Reduction Balance Percentage Distribution 1-A-1 986,130.71 31,013,869.29 0.96918342 986,130.71 2-A-1 1,836,898.19 142,163,101.81 0.98724376 1,836,898.19 2-A-2 72,682.50 19,057,317.50 0.99620060 72,682.50 2-A-3 (72,682.50) 15,930,682.50 1.00458333 (72,682.50) 2-A-4 0.00 19,888,000.00 1.00000000 0.00 3-A-1 595,277.89 74,592,722.11 0.99208281 595,277.89 3-A-2 158,343.86 19,841,656.14 0.99208281 158,343.86 3-A-3 43,749.48 7,638,250.52 0.99430494 43,749.48 3-A-4 0.00 10,779,508.00 1.00000000 0.00 3-A-5 (43,749.48) 10,043,749.48 1.00437495 (43,749.48) 3-A-6 0.00 12,000,000.00 1.00000000 0.00 3-A-7 0.00 2,264,000.00 1.00000000 0.00 4-A-1 2,868,524.83 112,131,475.17 0.97505631 2,868,524.83 5-A-1 161,599.10 40,623,400.90 0.99603778 161,599.10 6-A-1 272,469.35 64,727,530.65 0.99580816 272,469.35 7-A-1 946,279.35 49,503,720.65 0.98124322 946,279.35 8-A-1 403,616.35 13,704,383.65 0.97139096 403,616.35 8-A-2 0.00 74,996,000.00 1.00000000 0.00 PO 58,130.16 6,080,566.41 0.99053054 58,130.16 15-AX 0.00 0.00 0.00000000 0.00 30-AX 0.00 0.00 0.00000000 0.00 A-LR 50.00 0.00 0.00000000 50.00 A-UR 50.00 0.00 0.00000000 50.00 8-B-1 2,341.28 631,658.72 0.99630713 2,341.28 8-B-2 668.41 180,331.59 0.99630713 668.41 8-B-3 664.72 179,335.28 0.99630711 664.72 8-B-4 668.41 180,331.59 0.99630713 668.41 8-B-5 502.23 135,497.77 0.99630713 502.23 8-B-6 169.07 45,612.45 0.99630703 169.07 30-B-1 6,128.62 6,062,871.38 0.99899018 6,128.62 30-B-2 1,988.34 1,967,011.66 0.99899018 1,988.34 30-B-3 1,159.28 1,146,840.72 0.99899017 1,159.28 30-B-4 662.44 655,337.56 0.99899018 662.44 30-B-5 828.22 819,334.78 0.99899018 828.22 30-B-6 497.64 492,302.16 0.99899018 497.64 Totals 8,303,648.45 739,476,400.44 0.98889560 8,303,648.45REPORT

~~Principal~~Pursuant ~~Distribution~~to ~~Factors~~Section Statement Original Beginning Scheduled Unscheduled Face Certificate Principal Principal Class (2) Amount Balance Distribution Distribution Accretion 1-A-1 32,000,000.00 1000.00000000 3.91113594 26.90544875 0.00000000 2-A-1 144,000,000.00 1000.00000000 1.42507410 11.33116333 0.00000000 2-A-2 19,130,000.00 1000.00000000 0.42445321 3.37494564 0.00000000 2-A-3 15,858,000.00 1000.00000000 0.00000000 0.00000000 (4.58333333) 2-A-4 19,888,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 3-A-1 75,188,000.00 1000.00000000 1.66032159 6.25687118 0.00000000 3-A-2 20,000,000.00 1000.00000000 1.66032150 6.25687100 0.00000000 3-A-3 7,682,000.00 1000.00000000 1.19431658 4.50074590 0.00000000 3-A-4 10,779,508.00 1000.00000000 0.00000000 0.00000000 0.00000000 3-A-5 10,000,000.00 1000.00000000 0.00000000 0.00000000 (4.37494800) 3-A-6 12,000,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 3-A-7 2,264,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 4-A-1 115,000,000.00 1000.00000000 0.93938565 24.00430852 0.00000000 5-A-1 40,785,000.00 1000.00000000 3.53979331 0.42242565 0.00000000 6-A-1 65,000,000.00 1000.00000000 3.79665092 0.39518523 0.00000000 7-A-1 50,450,000.00 1000.00000000 5.10933300 13~~.64744301~~ ~~0.00000000~~or ~~8-A-1 14,108,000.00 1000.00000000 23.32360859 5.28543238 0.00000000 8-A-2 74,996,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 PO 6,138,696.57 1000.00000000 2.40185353 7.06760784 0.00000000~~ 15-AX 0.00 0.00000000 0.00000000 0.00000000 0.00000000 30-AX 0.00 0.00000000 0.00000000 0.00000000 0.00000000 A-LR 50.00 1000.00000000 127.00000000 873.00000000 0.00000000 A-UR 50.00 1000.00000000 127.00000000 873.00000000 0.00000000 8-B-1 634,000.00 1000.00000000 3.69287066 0.00000000 0.00000000 8-B-2 181,000.00 1000.00000000 3.69287293 0.00000000 0.00000000 8-B-3 180,000.00 1000.00000000 3.69288889 0.00000000 0.00000000 8-B-4 181,000.00 1000.00000000 3.69287293 0.00000000 0.00000000 8-B-5 136,000.00 1000.00000000 3.69286765 0.00000000 0.00000000 8-B-6 45,781.52 1000.00000000 3.69297481 0.00000000 0.00000000 15-B-1 966,000.00 1000.00000000 4.11552795 0.00000000 0.00000000 15-B-2 386,000.00 1000.00000000 4.11551813 0.00000000 0.00000000 15-B-3 290,000.00 1000.00000000 4.11551724 0.00000000 0.00000000 15-B-4 193,000.00 1000.00000000 4.11554404 0.00000000 0.00000000 15-B-5 194,000.00 1000.00000000 4.11551546 0.00000000 0.00000000 15-B-6 96,783.46 1000.00000000 4.11557925 0.00000000 0.00000000 30-B-1 6,069,000.00 1000.00000000 1.00982369 0.00000000 0.00000000 30-B-2 1,969,000.00 1000.00000000 1.00982224 0.00000000 0.00000000 30-B-3 1,148,000.00 1000.00000000 1.00982578 0.00000000 0.00000000 30-B-4 656,000.00 1000.00000000 1.00981707 0.00000000 0.00000000 30-B-5 820,163.00 1000.00000000 1.00982366 0.00000000 0.00000000 30-B-6 492,799.80 1000.00000000 1.00982184 0.00000000 0.00000000 (2d) ~~All~~of ~~Classes are per $1,000 denomination~~the

~~Principal~~Securities ~~Distribution~~Exchange ~~Factors~~Act ~~Statement~~of (continued) Total Ending Ending Total Realized Principal Certificate Certificate Principal Class Loss (3) Reduction Balance Percentage Distribution 1-A-1 0.00000000 30.81658469 969.18341531 0.96918342 30.81658469 2-A-1 0.00000000 12.75623743 987.24376257 0.98724376 12.75623743 2-A-2 0.00000000 3.79939885 996.20060115 0.99620060 3.79939885 2-A-3 0.00000000 (4.58333333) 1,004.58333333 1.00458333 (4.58333333) 2-A-4 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 3-A-1 0.00000000 7.91719277 992.08280723 0.99208281 7.91719277 3-A-2 0.00000000 7.91719300 992.08280700 0.99208281 7.91719300 3-A-3 0.00000000 5.69506379 994.30493621 0.99430494 5.69506379 3-A-4 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 3-A-5 0.00000000 (4.37494800) 1,004.37494800 1.00437495 (4.37494800) 3-A-6 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 3-A-7 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 4-A-1 0.00000000 24.94369417 975.05630583 0.97505631 24.94369417 5-A-1 0.00000000 3.96221895 996.03778105 0.99603778 3.96221895 6-A-1 0.00000000 4.19183615 995.80816385 0.99580816 4.19183615 7-A-1 0.00000000 18.75677602 981.24322398 0.98124322 18.75677602 8-A-1 0.00000000 28.60904097 971.39095903 0.97139096 28.60904097 8-A-2 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 PO 0.00000000 9.46946299 990.53053701 0.99053054 9.46946299 15-AX 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 30-AX 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 A-LR 0.00000000 1,000.00000000 0.00000000 0.00000000 1,000.00000000 A-UR 0.00000000 1,000.00000000 0.00000000 0.00000000 1,000.00000000 8-B-1 0.00000000 3.69287066 996.30712934 0.99630713 3.69287066 8-B-2 0.00000000 3.69287293 996.30712707 0.99630713 3.69287293 8-B-3 0.00000000 3.69288889 996.30711111 0.99630711 3.69288889 8-B-4 0.00000000 3.69287293 996.30712707 0.99630713 3.69287293 8-B-5 0.00000000 3.69286765 996.30713235 0.99630713 3.69286765 8-B-6 0.00000000 3.69297481 996.30702519 0.99630703 3.69297481 15-B-1 0.00000000 4.11552795 995.88447205 0.99588447 4.11552795 15-B-2 0.00000000 4.11551813 995.88448187 0.99588448 4.11551813 15-B-3 0.00000000 4.11551724 995.88448276 0.99588448 4.11551724 15-B-4 0.00000000 4.11554404 995.88445596 0.99588446 4.11554404 15-B-5 0.00000000 4.11551546 995.88448454 0.99588448 4.11551546 15-B-6 0.00000000 4.11557925 995.88442075 0.99588442 4.11557925 30-B-1 0.00000000 1.00982369 998.99017631 0.99899018 1.00982369 30-B-2 0.00000000 1.00982224 998.99017776 0.99899018 1.00982224 30-B-3 0.00000000 1.00982578 998.99017422 0.99899017 1.00982578 30-B-4 0.00000000 1.00981707 998.99018293 0.99899018 1.00981707 30-B-5 0.00000000 1.00982366 998.99017634 0.99899018 1.00982366 30-B-6 0.00000000 1.00982184 998.99017816 0.99899018 1.00982184 (3) Amount Does Not Include Excess Special Hazard, Bankruptcy, or Fraud Losses Unless Otherwise Disclosed. Please Refer to the Prospectus Supplement for a Full Description.1934

~~Interest~~Date ~~Distribution Statement Beginning Payment~~ of ~~Original~~Report: October ~~Current Certificate/ Current Unpaid Current Face Certificate Notional Accrued Interest Interest Class Amount Rate Balance Interest Shortfall Shortfall 1-A-1 32~~22,~~000,000.00~~ ~~4.75000%~~2004 (date ~~32,000,000.00~~of ~~126,666.67~~earliest ~~0.00~~event ~~0.00~~reported) MORTGAGE ~~2-A-1~~ASSET ~~144,000,000.00~~SECURITIZATION ~~5.50000% 144~~TRANSACTIONS,~~000,000.00~~ ~~660,000~~INC.00 ~~0.00~~(as ~~0.00~~depositor ~~2-A-2~~under ~~19,130,000.00~~the ~~5.50000%~~Pooling ~~19,130,000.00~~and ~~87,679.17~~Servicing ~~0.00 0.00 2-A-3 15~~Agreement,~~858,000.00~~ ~~5.50000%~~relating ~~15,858,000.00~~to ~~72,682.50~~the ~~0.00~~MASTR ~~0.00~~Asset ~~2-A-4~~Securitization ~~19,888,000.00~~Trust ~~5.50000% 19,888,000.00 91,153.33 0.00 0.00 3~~2004-A-1 75,188,000.00 5.25000% 75,188,000.00 328,947.50 0.00 0.00 3-A-2 20,000,000.00 5.25000% 20,000,000.00 87,500.00 0.00 0.00 3-A-3 7,682,000.00 5.25000% 7,682,000.00 33,608.75 0.00 0.00 3-A-4 10,779,508.00 5.25000% 10,779,508.00 47,160.35 0.00 0.00 3-A-5 10,000,000.00 5.25000% 10,000,000.00 43,750.00 0.00 0.00 3-A-6 12,000,000.00 5.25000% 12,000,000.00 52,500.00 0.00 0.00 3-A-7 2,264,000.00 5.25000% 2,264,000.00 9~~,905.00~~ ~~0.00~~Mortgage ~~0.00 4~~Pass-~~A-1~~Through ~~115~~Certificates,~~000,000.00~~ ~~6.00000%~~Series ~~115,000,000.00 575,000.00 0.00 0.00 5~~2004-A-1 40,785,000.00 5.25000% 40,785,000.00 178,434.38 0.00 0.00 6-A-1 65,000,000.00 5.00000% 65,000,000.00 270,833.33 0.00 0.00 7-A-1 50,450,000.00 6.32742% 50,450,000.00 266,015.47 0.00 0.00 8-A-1 14,108,000.00 5.14911% 14,108,000.00 60,536.40 0.00 0.00 8-A-2 74,996,000.00 5.14911% 74,996,000.00 321,802.39 0.00 0.00 PO 6,138,696.57 0.00000% 6,138,696.57 0.00 0.00 0.00 15-AX 0.00 5.00000% 2,435,730.37 10,148.88 0.00 0.00 30-AX 0.00 5.50000% 14,043,053.90 64,364.00 0.00 0.00 A-LR 50.00 4.75000% 50.00 0.20 0.00 0.00 A-UR 50.00 4.75000% 50.00 0.20 0.00 0.00 8-B-1 634,000.00 5.14911% 634,000.00 2,720.45 0.00 0.00 8-B-2 181,000.00 5.14911% 181,000.00 776.66 0.00 0.00 8-B-3 180,000.00 5.14911% 180,000.00 772.37 0.00 0.00 8-B-4 181,000.00 5.14911% 181,000.00 776.66 0.00 0.00 8-B-5 136,000.00 5.14911% 136,000.00 583.57 0.00 0.00 8-B-6 45,781.52 5.14911% 45,781.52 196.45 0.00 0.00 15-B-1 966,000.00 5.36626% 966,000.00 4,319.84 0.00 0.00 15-B-2 386,000.00 5.36626% 386,000.00 1,726.15 0.00 0.00 15-B-3 290,000.00 5.36626% 290,000.00 1,296.85 0.00 0.00 15-B-4 193,000.00 5.36626% 193,000.00 863.07 0.00 0.00 15-B-5 194,000.00 5.36626% 194,000.00 867.55 0.00 0.00 15-B-6 96,783.46 5.36626% 96,783.46 432.80 0.00 0.00 30-B-1 6,069,000.00 5.61912% 6,069,000.00 28,418.70 0.00 0.00 30-B-2 1,969,000.00 5.61912% 1,969,000.00 9,220.04 0.00 0.00 30-B-3 1,148,000.00 5.61912% 1,148,000.00 5,375.62 0.00 0.00 30-B-4 656,000.00 5.61912% 656,000.00 3,071.79 0.00 0.00 30-B-5 820,163.00 5.61912% 820,163.00 3,840.50 0.00 0.00 30-B-6 492,799.80 5.61912% 492,799.80 2,307.58 0.00 0.00 Totals 749,905,832.35 3,456,255.17 0.00 0.00)

Interest Distribution Statement (continued) Remaining Ending Non-Supported Total Unpaid Certificate/ Interest Realized Interest Interest Notional Class Shortfall Losses (4) Distribution Shortfall Balance 1-A-1 0.00 0.00 126,666.67 0.00 31,013,869.29 2-A-1 0.00 0.00 660,000.00 0.00 142,163,101.81 2-A-2 0.00 0.00 87,679.17 0.00 19,057,317.50 2-A-3 0.00 0.00 72,682.50 0.00 15,930,682.50 2-A-4 0.00 0.00 91,153.33 0.00 19,888,000.00 3-A-1 3.95 0.00 328,943.55 0.00 74,592,722.11 3-A-2 1.05 0.00 87,498.95 0.00 19,841,656.14 3-A-3 0.40 0.00 33,608.35 0.00 7,638,250.52 3-A-4 0.57 0.00 47,159.78 0.00 10,779,508.00 3-A-5 0.52 0.00 43,749.48 0.00 10,043,749.48 3-A-6 0.63 0.00 52,499.37 0.00 12,000,000.00 3-A-7 0.12 0.00 9,904.88 0.00 2,264,000.00 4-A-1 0.00 0.00 575,000.00 0.00 112,131,475.17 5-A-1 0.00 0.00 178,434.38 0.00 40,623,400.90 6-A-1 0.00 0.00 270,833.33 0.00 64,727,530.65 7-A-1 0.00 0.00 266,015.47 0.00 49,503,720.65 8-A-1 0.00 0.00 60,536.40 0.00 13,704,383.65 8-A-2 0.00 0.00 321,802.39 0.00 74,996,000.00 PO 0.00 0.00 0.00 0.00 6,080,566.41 15-AX 0.00 0.00 10,148.88 0.00 2,425,728.44 30-AX 0.01 0.00 64,363.98 0.00 13,759,786.05 A-LR 0.00 0.00 0.20 0.00 0.00 A-UR 0.00 0.00 0.20 0.00 0.00 8-B-1 0.00 0.00 2,720.45 0.00 631,658.72 8-B-2 0.00 0.00 776.66 0.00 180,331.59 8-B-3 0.00 0.00 772.37 0.00 179,335.28 8-B-4 0.00 0.00 776.66 0.00 180,331.59 8-B-5 0.00 0.00 583.57 0.00 135,497.77 8-B-6 0.00 0.00 196.45 0.00 45,612.45 15-B-1 0.00 0.00 4,319.84 0.00 962,024.40 15-B-2 0.00 0.00 1,726.15 0.00 384,411.41 15-B-3 0.00 0.00 1,296.85 0.00 288,806.50 15-B-4 0.00 0.00 863.07 0.00 192,205.70 15-B-5 0.00 0.00 867.55 0.00 193,201.59 15-B-6 0.00 0.00 432.80 0.00 96,385.14 30-B-1 0.00 0.00 28,418.70 0.00 6,062,871.38 30-B-2 0.00 0.00 9,220.04 0.00 1,967,011.66 30-B-3 0.00 0.00 5,375.62 0.00 1,146,840.72 30-B-4 0.00 0.00 3,071.79 0.00 655,337.56 30-B-5 0.00 0.00 3,840.50 0.00 819,334.78 30-B-6 0.00 0.00 2,307.58 0.00 492,302.16 Totals 7.25 0.00 3,456,247.91 0.00 (4) Amount Does Not Include Excess Special Hazard, Bankruptcy, or Fraud Losses Unless Otherwise Disclosed. Please Refer to the Prospectus Supplement for a Full Description.

MORTGAGE ASSET SECURITIZATION TRANSACTIONS, INC.
(Exact name of registrant as specified in its charter)
Delaware	333-106982	06-1204982
(State or Other Jurisdiction of Incorporation)	(Commission File Number)	(I.R.S. Employer Identification No.)

1285 Avenue of the Americas New York, New York 10019
(Address of Principal Executive Offices) (Zip Code)

Registrant’s telephone number, including area code (212) 713-2000

~~Interest~~Check ~~Distribution~~the ~~Factors~~appropriate ~~Statement~~box ~~Beginning~~below ~~Payment~~if ofthe ~~Original~~Form Current Certificate/ Current Unpaid Current Face Certificate Notional Accrued Interest Interest Class (5) Amount Rate Balance Interest Shortfall Shortfall 1-A-1 32,000,000.00 4.75000% 1000.00000000 3.95833344 0.00000000 0.00000000 2-A-1 144,000,000.00 5.50000% 1000.00000000 4.58333333 0.00000000 0.00000000 2-A-2 19,130,000.00 5.50000% 1000.00000000 4.58333351 0.00000000 0.00000000 2-A-3 15,858,000.00 5.50000% 1000.00000000 4.58333333 0.00000000 0.00000000 2-A-4 19,888,000.00 5.50000% 1000.00000000 4.58333317 0.00000000 0.00000000 3-A-1 75,188,000.00 5.25000% 1000.00000000 4.37500000 0.00000000 0.00000000 3-A-2 20,000,000.00 5.25000% 1000.00000000 4.37500000 0.00000000 0.00000000 3-A-3 7,682,000.00 5.25000% 1000.00000000 4.37500000 0.00000000 0.00000000 3-A-4 10,779,508.00 5.25000% 1000.00000000 4.37500023 0.00000000 0.00000000 3-A-5 10,000,000.00 5.25000% 1000.00000000 4.37500000 0.00000000 0.00000000 3-A-6 12,000,000.00 5.25000% 1000.00000000 4.37500000 0.00000000 0.00000000 3-A-7 2,264,000.00 5.25000% 1000.00000000 4.37500000 0.00000000 0.00000000 4-A-1 115,000,000.00 6.00000% 1000.00000000 5.00000000 0.00000000 0.00000000 5-A-1 40,785,000.00 5.25000% 1000.00000000 4.37500012 0.00000000 0.00000000 6-A-1 65,000,000.00 5.00000% 1000.00000000 4.16666662 0.00000000 0.00000000 7-A-1 50,450,000.00 6.32742% 1000.00000000 5.27285372 0.00000000 0.00000000 8-~~A-1~~K ~~14,108,000.00~~filing ~~5.14911%~~is ~~1000.00000000~~intended ~~4.29092713~~to ~~0.00000000~~simultaneously ~~0.00000000~~satisfy ~~8-A-2~~the ~~74,996,000.00~~filing ~~5.14911%~~obligation ~~1000.00000000~~of ~~4.29092738~~the ~~0.00000000~~registrant ~~0.00000000~~under POany ~~6,138,696.57~~of ~~0.00000%~~the ~~1000.00000000~~following 0.00000000 0.00000000 0.00000000 15-AX 0.00 5.00000% 999.99522117 4.16664817 0.00000000 0.00000000 30-AX 0.00 5.50000% 999.99799332 4.58332435 0.00000000 0.00000000 A-LR 50.00 4.75000% 1000.00000000 4.00000000 0.00000000 0.00000000 A-UR 50.00 4.75000% 1000.00000000 4.00000000 0.00000000 0.00000000 8-B-1 634,000.00 5.14911% 1000.00000000 4.29093060 0.00000000 0.00000000 8-B-2 181,000.00 5.14911% 1000.00000000 4.29093923 0.00000000 0.00000000 8-B-3 180,000.00 5.14911% 1000.00000000 4.29094444 0.00000000 0.00000000 8-B-4 181,000.00 5.14911% 1000.00000000 4.29093923 0.00000000 0.00000000 8-B-5 136,000.00 5.14911% 1000.00000000 4.29095588 0.00000000 0.00000000 8-B-6 45,781.52 5.14911% 1000.00000000 4.29103271 0.00000000 0.00000000 15-B-1 966,000.00 5.36626% 1000.00000000 4.47188406 0.00000000 0.00000000 15-B-2 386,000.00 5.36626% 1000.00000000 4.47189119 0.00000000 0.00000000 15-B-3 290,000.00 5.36626% 1000.00000000 4.47189655 0.00000000 0.00000000 15-B-4 193,000.00 5.36626% 1000.00000000 4.47186528 0.00000000 0.00000000 15-B-5 194,000.00 5.36626% 1000.00000000 4.47190722 0.00000000 0.00000000 15-B-6 96,783.46 5.36626% 1000.00000000 4.47183847 0.00000000 0.00000000 30-B-1 6,069,000.00 5.61912% 1000.00000000 4.68260010 0.00000000 0.00000000 30-B-2 1,969,000.00 5.61912% 1000.00000000 4.68260030 0.00000000 0.00000000 30-B-3 1,148,000.00 5.61912% 1000.00000000 4.68259582 0.00000000 0.00000000 30-B-4 656,000.00 5.61912% 1000.00000000 4.68260671 0.00000000 0.00000000 30-B-5 820,163.00 5.61912% 1000.00000000 4.68260577 0.00000000 0.00000000 30-B-6 492,799.80 5.61912% 1000.00000000 4.68259119 0.00000000 0.00000000 (5) All Classes are per $1,000 denominationprovisions:

~~Interest~~ڤ ~~Distribution~~Written ~~Factors~~communications ~~Statement~~pursuant ~~(continued)~~to ~~Remaining~~Rule ~~Ending~~425 ~~Non-Supported~~under ~~Total~~the ~~Unpaid~~Securities ~~Certificate/~~Act ~~Interest Realized Interest Interest Notional Class Shortfall Losses~~ (6)17 ~~Distribution~~CFR ~~Shortfall Balance 1-A-1 0~~230.~~00000000~~425) ~~0.00000000~~ڤ ~~3.95833344~~Soliciting ~~0.00000000~~material ~~969.18341531~~pursuant ~~2-A-1~~to ~~0.00000000~~Rule ~~0.00000000 4.58333333 0.00000000 987.24376257 2~~14a-~~A-2~~12 ~~0.00000000~~under ~~0.00000000~~the ~~4.58333351~~Exchange ~~0.00000000~~Act ~~996.20060115~~(17 ~~2-A-3~~CFR 0240.~~00000000 0.00000000 4.58333333 0.00000000 1004.58333333 2~~14a-~~A-4~~12) ~~0.00000000~~ڤ ~~0.00000000 4.58333317 0.00000000 1000.00000000 3~~Pre-~~A-1~~commencement ~~0.00005253~~communications ~~0.00000000~~pursuant ~~4.37494747~~to ~~0.00000000~~Rule ~~992.08280723 3~~14d-A-2(d) ~~0.00005250~~under ~~0.00000000~~the ~~4.37494750~~Exchange ~~0.00000000~~Act ~~992.08280700~~(17 ~~3-A-3~~CFR 0240.~~00005207 0.00000000 4.37494793 0.00000000 994.30493621 3~~14d-A-4 0.00005288 0.00000000 4.37494735 0.00000000 1000.00000000 3-A-5 0.00005200 0.00000000 4.37494800 0.00000000 1004.37494800 3-A-6 0.00005250 0.00000000 4.37494750 0.00000000 1000.00000000 3-A-7 0.00005300 0.00000000 4.37494700 0.00000000 1000.00000000 4-A-1 0.00000000 0.00000000 5.00000000 0.00000000 975.05630583 5-A-1 0.00000000 0.00000000 4.37500012 0.00000000 996.03778105 6-A-1 0.00000000 0.00000000 4.16666662 0.00000000 995.80816385 7-A-1 0.00000000 0.00000000 5.27285372 0.00000000 981.24322398 8-A-1 0.00000000 0.00000000 4.29092713 0.00000000 971.39095903 8-A-2(b)) ~~0.00000000~~ڤ ~~0.00000000 4.29092738 0.00000000 1000.00000000 PO 0.00000000 0.00000000 0.00000000 0.00000000 990.53053701 15~~Pre-AXcommencement ~~0.00000000~~communications ~~0.00000000~~pursuant ~~4.16664817~~to ~~0.00000000~~Rule ~~995.88890369 30~~13e-~~AX 0.00000071 0.00000000~~ 4~~.58332292~~(c) ~~0.00000000~~under ~~979.82664857~~the ~~A-LR~~Exchange ~~0.00000000~~Act ~~0.00000000~~(17 ~~4.00000000~~CFR 0240.~~00000000 0.00000000 A~~13e-~~UR 0.00000000 0.00000000~~ 4.00000000 0.00000000 0.00000000 8-B-1 0.00000000 0.00000000 4.29093060 0.00000000 996.30712934 8-B-2 0.00000000 0.00000000 4.29093923 0.00000000 996.30712707 8-B-3 0.00000000 0.00000000 4.29094444 0.00000000 996.30711111 8-B-4 0.00000000 0.00000000 4.29093923 0.00000000 996.30712707 8-B-5 0.00000000 0.00000000 4.29095588 0.00000000 996.30713235 8-B-6 0.00000000 0.00000000 4.29103271 0.00000000 996.30702519 15-B-1 0.00000000 0.00000000 4.47188406 0.00000000 995.88447205 15-B-2 0.00000000 0.00000000 4.47189119 0.00000000 995.88448187 15-B-3 0.00000000 0.00000000 4.47189655 0.00000000 995.88448276 15-B-4 0.00000000 0.00000000 4.47186528 0.00000000 995.88445596 15-B-5 0.00000000 0.00000000 4.47190722 0.00000000 995.88448454 15-B-6 0.00000000 0.00000000 4.47183847 0.00000000 995.88442075 30-B-1 0.00000000 0.00000000 4.68260010 0.00000000 998.99017631 30-B-2 0.00000000 0.00000000 4.68260030 0.00000000 998.99017776 30-B-3 0.00000000 0.00000000 4.68259582 0.00000000 998.99017422 30-B-4 0.00000000 0.00000000 4.68260671 0.00000000 998.99018293 30-B-5 0.00000000 0.00000000 4.68260577 0.00000000 998.99017634 30-B-6 0.00000000 0.00000000 4.68259119 0.00000000 998.99017816 (6c) ~~Amount Does Not Include Excess Special Hazard, Bankruptcy,or Fraud Losses Unless Otherwise Disclosed. Please Refer to the Prospectus Supplement for a Full Description.~~)

~~Certificateholder~~Item ~~Component Statement Component Beginning Ending Beginning Ending Ending Pass-Through Notional Notional Component Component Component Class Rate Balance Balance Balance Balance Percentage PO-1 0~~8.~~00000% 0~~01.00 Other 0.00 1,595,163.90 1,565,431.96 98.13612006% PO-2 0.00000% 0.00 0.00 2,024,374.90 2,003,732.66 98.98031536% PO-3 0.00000% 0.00 0.00 263,193.72 261,755.51 99.45355459% PO-4 0.00000% 0.00 0.00 1,009,647.57 1,008,554.56 99.89174341% PO-5 0.00000% 0.00 0.00 5,102.18 5,079.85 99.56234394% PO-6 0.00000% 0.00 0.00 1,241,214.30 1,236,011.87 99.58085965% 15-AX-2 5.00000% 2,117,388.24 2,108,853.22 0.00 0.00 99.59660520% 15-AX-4 5.00000% 318,342.13 316,875.22 0.00 0.00 99.53757740% 30-AX-1 5.50000% 9,994,578.23 9,836,826.00 0.00 0.00 98.42157861% 30-AX-5 5.50000% 251,230.37 249,857.53 0.00 0.00 99.45355333% 30-AX-6 5.50000% 3,797,245.30 3,673,102.52 0.00 0.00 96.73010900%Events

~~CERTIFICATEHOLDER~~Master ~~ACCOUNT~~Asset ~~STATEMENT~~Securitization ~~CERTIFICATE~~Transactions, ~~ACCOUNT~~Inc. ~~Beginning~~(the ~~Balance~~“Company”) ~~0.00~~entered ~~Deposits~~into ~~Payments~~a ofPooling ~~Interest~~ and ~~Principal~~Servicing ~~11,898,383.40~~Agreement ~~Liquidations,~~dated ~~Insurance~~as ~~Proceeds~~of August 1, ~~Reserve~~2004 ~~Funds~~(the ~~0.00~~“Agreement”) ~~Proceeds~~among ~~from~~the ~~Repurchased~~Company, ~~Loans~~in ~~0.00~~its ~~Other~~capacity ~~Amounts~~as depositor (~~Servicer~~in ~~Advances~~such capacity, the “Depositor”), 0UBS Real Estate Securities Inc.00, ~~Realized~~as ~~Loss~~transferor (~~Gains,~~in ~~Subsequent~~such ~~Expenses~~capacity, &the ~~Recoveries~~“Transferor”), ~~0.00~~Wells ~~Prepayment~~Fargo ~~Penalties~~Bank, 0N.00A., ~~Total~~as ~~Deposits~~master 11servicer (in such capacity,~~898~~ the “Master Servicer”),~~383.40~~ ~~Withdrawals~~as ~~Reimbursement~~trust ~~for~~administrator ~~Servicer~~(in ~~Advances~~such ~~0.00~~capacity, ~~Payment~~the of“Trust ~~Service~~Administrator”), ~~Fee~~as ~~129~~securities intermediary (in such capacity,~~738.32~~ ~~Payment~~the of“Securities ~~Interest~~Intermediary”) and ~~Principal~~as 11a custodian (in such capacity,~~768~~ a “Custodian”),~~645~~ U.08S. ~~Total~~Bank ~~Withdrawals~~National Association, as trustee (~~Pool~~in ~~Distribution~~such ~~Amount~~capacity, the “Trustee”) 11and as a custodian (in such capacity,~~898~~ a “Custodian”). The Certificates were issued on August 27,~~383~~ 2004.40 The ~~Ending~~Pooling ~~Balance~~and 0Servicing Agreement is annexed hereto as Exhibit 99.001.

~~PREPAYMENT/CURTAILMENT~~Item ~~INTEREST SHORTFALL Total Prepayment/Curtailment Interest Shortfall 7~~9.~~25 Servicing Fee Support 0~~01.00 Financial ~~Non-Supported~~Statements ~~Prepayment/Curtailment~~and ~~Interest Shortfall 7~~Exhibits.25

SERVICING FEES Gross Servicing Fee 127,512.94 LPMI Fees 1,052.76 Master Servicing Fee 775.80 WMMSC Master Servicing Fee 396.82 Supported Prepayment/Curtailment Interest Shortfall 0.00 Net Servicing Fee 129,738.32(a)

~~LOAN~~Not STATUS STRATIFICATION/CREDIT ENHANCEMENT STATEMENT DELINQUENCY STATUS DELINQUENT BANKRUPTCY FORECLOSURE REO Total No of Loans No of Loans No of Loans No of Loans No of Loans Principal Balance Principal Balance Principal Balance Principal Balance Principal Balance 0-29 Days 0 0 0 0 0applicable.00 0.00 0.00 0.00 30 Days 4 0 0 0 4 1,936,007.09 0.00 0.00 0.00 1,936,007.09 60 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 90 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 120 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 150 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 180+ Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 Totals 4 0 0 0 4 1,936,007.09 0.00 0.00 0.00 1,936,007.09 No of Loans No of Loans No of Loans No of Loans No of Loans Principal Balance Principal Balance Principal Balance Principal Balance Principal Balance 0-29 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 30 Days 0.327600% 0.000000% 0.000000% 0.000000% 0.327600% 0.319867% 0.000000% 0.000000% 0.000000% 0.319867% 60 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 90 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 120 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 150 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 180+ Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% Totals 0.327600% 0.000000% 0.000000% 0.000000% 0.327600% 0.319867% 0.000000% 0.000000% 0.000000% 0.319867%

Delinquency Status By Groups DELINQUENT BANKRUPTCY FORECLOSURE REO Total 6 No of Loans No of Loans No of Loans No of Loans No of Loans Principal Balance Principal Balance Principal Balance Principal Balance Principal Balance 0-29 Days 0 0 0 0 0.00 0.00 0.00 0.00 30 Days 2 0 0 0 2 896,007.09 0.00 0.00 0.00 896,007.09 60 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 90 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 120 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 150 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 180 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 Totals 2 0 0 0 2 896,007.09 0.00 0.00 0.00 896,007.09 0-29 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 30 Days 1.550388% 0.000000% 0.000000% 0.000000% 1.550388% 1.342342% 0.000000% 0.000000% 0.000000% 1.342342% 60 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 90 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 120 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 150 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 180 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% Totals 1.550388% 0.000000% 0.000000% 0.000000% 1.550388% 1.342342% 0.000000% 0.000000% 0.000000% 1.342342% DELINQUENT BANKRUPTCY FORECLOSURE REO Total 7 No of Loans No of Loans No of Loans No of Loans No of Loans Principal Balance Principal Balance Principal Balance Principal Balance Principal Balance 0-29 Days 0 0 0 0 0.00 0.00 0.00 0.00 30 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 60 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 90 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 120 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 150 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 180 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 Totals 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 0-29 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 30 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 60 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 90 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 120 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 150 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 180 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% Totals 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% DELINQUENT BANKRUPTCY FORECLOSURE REO Total 8 No of Loans No of Loans No of Loans No of Loans No of Loans Principal Balance Principal Balance Principal Balance Principal Balance Principal Balance 0-29 Days 0 0 0 0 0.00 0.00 0.00 0.00 30 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 60 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 90 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 120 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 150 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 180 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 Totals 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 0-29 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 30 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 60 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 90 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 120 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 150 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 180 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% Totals 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% DELINQUENT BANKRUPTCY FORECLOSURE REO Total 1 No of Loans No of Loans No of Loans No of Loans No of Loans Principal Balance Principal Balance Principal Balance Principal Balance Principal Balance 0-29 Days 0 0 0 0 0.00 0.00 0.00 0.00 30 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 60 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 90 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 120 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 150 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 180 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 Totals 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 0-29 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 30 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 60 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 90 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 120 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 150 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 180 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% Totals 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% DELINQUENT BANKRUPTCY FORECLOSURE REO Total 2 No of Loans No of Loans No of Loans No of Loans No of Loans Principal Balance Principal Balance Principal Balance Principal Balance Principal Balance 0-29 Days 0 0 0 0 0.00 0.00 0.00 0.00 30 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 60 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 90 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 120 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 150 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 180 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 Totals 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 0-29 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 30 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 60 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 90 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 120 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 150 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 180 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% Totals 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% DELINQUENT BANKRUPTCY FORECLOSURE REO Total 4 No of Loans No of Loans No of Loans No of Loans No of Loans Principal Balance Principal Balance Principal Balance Principal Balance Principal Balance 0-29 Days 0 0 0 0 0.00 0.00 0.00 0.00 30 Days 1 0 0 0 1 440,000.00 0.00 0.00 0.00 440,000.00 60 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 90 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 120 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 150 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 180 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 Totals 1 0 0 0 1 440,000.00 0.00 0.00 0.00 440,000.00 0-29 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 30 Days 0.421941% 0.000000% 0.000000% 0.000000% 0.421941% 0.379746% 0.000000% 0.000000% 0.000000% 0.379746% 60 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 90 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 120 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 150 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 180 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% Totals 0.421941% 0.000000% 0.000000% 0.000000% 0.421941% 0.379746% 0.000000% 0.000000% 0.000000% 0.379746% DELINQUENT BANKRUPTCY FORECLOSURE REO Total 5 No of Loans No of Loans No of Loans No of Loans No of Loans Principal Balance Principal Balance Principal Balance Principal Balance Principal Balance 0-29 Days 0 0 0 0 0.00 0.00 0.00 0.00 30 Days 1 0 0 0 1 600,000.00 0.00 0.00 0.00 600,000.00 60 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 90 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 120 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 150 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 180 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 Totals 1 0 0 0 1 600,000.00 0.00 0.00 0.00 600,000.00 0-29 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 30 Days 1.388889% 0.000000% 0.000000% 0.000000% 1.388889% 1.455642% 0.000000% 0.000000% 0.000000% 1.455642% 60 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 90 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 120 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 150 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 180 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% Totals 1.388889% 0.000000% 0.000000% 0.000000% 1.388889% 1.455642% 0.000000% 0.000000% 0.000000% 1.455642%

(b)

~~OTHER~~Not ~~INFORMATION Current Period Class A Insufficient Funds 0~~applicable.~~00 Principal Balance of Contaminated Properties 0.00 Periodic Advance 14,556.30~~

CREDIT ENHANCEMENT Original $ Original % Current $ Current % Bankruptcy 200,000.00 0.02667002% 0.00 0.00000000% Fraud 7,465,181.00 0.99548246% 0.00 0.00000000% Special Hazard 5,983,567.00 0.79790912% 0.00 0.00000000% Limit of Subordinate's Exposure to Certain Types of Losses(c)

COLLATERAL STATEMENT Collateral Description Mixed Fixed Ratio Strip Weighted Average Gross Coupon 5.738310% Weighted Average Pass-Through Rate 5.530703% Weighted Average Maturity(Stepdown Calculation ) 270 Beginning Scheduled Collateral Loan Count 1,235 Number Of Loans Paid In Full 14 Ending Scheduled Collateral Loan Count 1,221 Beginning Scheduled Collateral Balance 749,905,832.35 Ending Scheduled Collateral Balance 604,171,793.42 Ending Actual Collateral Balance at 31-Aug-2004 605,252,885.55 Monthly P &I Constant 4,437,317.72 Special Servicing Fee 0.00 Prepayment Penalties 0.00 Realized Loss Amount 0.00 Cumulative Realized Loss 0.00 Class A Non-PO Optimal Amount 11,559,797.98 Class AP Deferred Amount 0.00 Scheduled Principal 1,455,847.19 Unscheduled Principal 6,101,490.02Exhibits:

~~Bankruptcy Coverage Amount - Asset Groups 1,5,6,7 100,000~~99.~~00 Bankruptcy Coverage Amount - Asset Groups 2 & 4 100,000.00 Bankruptcy Coverage Amount - Asset Group 8 100,000.00 Fraud Loss Coverage Amount - Asset Groups~~ 1,5,6,7 1,932,024.00 Fraud Loss Coverage Amount - Asset Groups 2 & 4 3,280,650.00 Fraud Loss Coverage Amount - Asset Group 8 904,618.00 Specail Hazard Loss Coverage Amount - Asset Groups 1,5,6,7 2,000,000.00 Specail Hazard Loss Coverage Amount - Asset Groups 2 & 4 3,983,567.00 Specail Hazard Loss Coverage Amount - Asset Group 8 2,977,506.00

~~Group~~The ~~Level~~Pooling ~~Collateral~~and ~~Statement~~Servicing ~~Group~~Agreement 1dated 2as 4of ~~Collateral~~August Description Fixed 15 Year Ratio Strip Fixed 30 Year Ratio Strip Fixed 30 Year Ratio Strip Weighted Average Coupon Rate 4.777813 5.970573 6.377696 Weighted Average Net Rate 4.527813 5.719995 6.127696 Weighted Average Maturity 176 355 357 Beginning Loan Count 65 424 243 Loans Paid In Full 1 ~~4 6 Ending Loan Count 64 420 237 Beginning Scheduled Balance 34~~,~~041,925.63~~ ~~209,397,781.38 118,667,203.89 Ending scheduled Balance 33,024,215.85 207,531,472.88 115,795,089.58 Record Date 08/31/~~2004 ~~08/31/2004 08/31/2004 Principal And Interest Constant 268~~,~~705.25~~ ~~1,258,139.57~~by ~~742,292.09~~and ~~Scheduled~~among ~~Principal~~the ~~133~~Company,~~166.95~~ ~~216,285.59~~the ~~111~~Transferor,~~606.00~~ ~~Unscheduled~~the ~~Principal~~Master ~~884~~Servicer,~~542.83~~ ~~1,650,022.91~~the ~~2,760,508.31~~Trust ~~Scheduled Interest 135~~Administrator,~~538.30~~ ~~1,041,853.98~~the ~~630,686.09~~Securities ~~Servicing Fees 7~~Intermediary,~~092.06~~ ~~43,725.35~~the ~~24,722.33~~Custodians ~~Master~~and ~~Servicing~~the ~~Fees 11.16 600.43 80.53~~ Trustee ~~Fee 0~~.00 0.00 0.00 FRY Amount 0.00 0.00 0.00 Special Hazard Fee 0.00 0.00 0.00 Other Fee 0.00 1,258.23 191.35 Pool Insurance Fee 0.00 0.00 0.00 Spread Fee 1 0.00 0.00 0.00 Spread Fee 2 0.00 0.00 0.00 Spread Fee 3 0.00 0.00 0.00 Net Interest 128,435.08 996,269.97 605,691.88 Realized Loss Amount 0.00 0.00 0.00 Cumulative Realized Loss 0.00 0.00 0.00 Percentage of Cumulative Losses 0.0000 0.0000 0.0000 Prepayment Penalties 0.00 0.00 0.00 Special Servicing Fee 0.00 0.00 0.00

Group Level Collateral Statement Group 5 6 7 Collateral Description Fixed 15 Year Ratio Strip Fixed 15 Year Ratio Strip Fixed 15 Year Ratio Strip Weighted Average Coupon Rate 5.756383 5.181502 6.577425 Weighted Average Net Rate 5.506382 4.932066 6.327425 Weighted Average Maturity 178 176 142 Beginning Loan Count 72 129 138 Loans Paid In Full 0 0 2 Ending Loan Count 72 129 136 Beginning Scheduled Balance 41,293,605.79 66,840,999.00 51,025,833.42 Ending scheduled Balance 41,130,202.06 66,561,050.05 50,076,611.94 Record Date 08/31/2004 08/31/2004 08/31/2004 Principal And Interest Constant 344,256.24 542,459.63 540,390.15 Scheduled Principal 146,171.41 253,845.68 260,707.98 Unscheduled Principal 17,232.32 26,103.27 688,513.50 Scheduled Interest 198,084.83 288,613.95 279,682.17 Servicing Fees 8,602.85 13,893.75 10,630.39 Master Servicing Fees 22.32 61.36 0.00 Trustee Fee 0.00 0.00 0.00 FRY Amount 0.00 0.00 0.00 Special Hazard Fee 0.00 0.00 0.00 Other Fee 0.00 0.00 0.00 Pool Insurance Fee 0.00 0.00 0.00 Spread Fee 1 0.00 0.00 0.00 Spread Fee 2 0.00 0.00 0.00 Spread Fee 3 0.00 0.00 0.00 Net Interest 189,459.66 274,658.84 269,051.78 Realized Loss Amount 0.00 0.00 0.00 Cumulative Realized Loss 0.00 0.00 0.00 Percentage of Cumulative Losses 0.0000 0.0000 0.0000 Prepayment Penalties 0.00 0.00 0.00 Special Servicing Fee 0.00 0.00 0.00SIGNATURES

~~Group~~Pursuant ~~Level~~to ~~Collateral~~the ~~Statement~~requirements ~~Group~~of 8the ~~Total~~Securities ~~Collateral~~Exchange ~~Description~~Act ~~Fixed~~of 15 Year Ratio Strip Mixed Fixed Ratio Strip Weighted Average Coupon Rate 5.399114 5.738310 Weighted Average Net Rate 5.149114 5.644563 Weighted Average Maturity 178.00 270.00 Record Date 08/31/2004 08/31/2004 Principal And Interest Constant 7411934,~~074.79~~ ~~4,437,317.72~~the ~~Beginning~~registrant ~~Loan~~has ~~Count~~duly ~~164~~caused ~~1,235~~this ~~Loans~~report ~~Paid~~to Inbe ~~Full~~signed 1on 14its ~~Ending~~behalf ~~Loan~~by ~~Count~~the ~~163 1~~undersigned,~~221~~ ~~Beginning~~thereunto ~~Scheduled~~duly ~~Balance 90,461,781~~authorized.52 611,729,130.63 Ending Scheduled Balance 90,053,151.06 604,171,793.42 Scheduled Principal 334,063.58 1,455,847.19 Unscheduled Principal 74,566.88 6,101,490.02 Scheduled Interest 407,011.21 2,981,470.53 Servicing Fee 18,846.21 127,512.94 Master Servicing Fee 0.00 775.80 Trustee Fee 0.00 0.00 Fry Amount 0.00 0.00 Special Hazard Fee 0.00 0.00 Other Fee 0.00 1,449.58 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 388,165.00 2,851,732.21 Realized Loss Amount 0.00 0.00 Cumulative Realized Loss 0.00 0.00 Percentage of Cumulative Losses 0.0000 0.0000 Prepayment Penalties 0.00 0.00 Special Servicing Fee 0.00 0.00

MORTGAGE ASSET SECURITIZATION

TRANSACTIONS, INC.

By: /s/Peter Ma

Name:

Peter Ma

Title:

Director

By: /s/ Peter Slagowitz

Name:

Peter Slagowitz

Title:

Managing Director

Dated: October 22, 2004_____

Exhibit Index

Exhibit

Page

99.1

Pooling and Servicing Agreement dated as of August 1, 2004,

by and among the Company, the Transferor, the Master Servicer, the Trust

Administrator, the Securities Intermediary, the Custodians and the Trustee.

Filing Compare · MASTR Asset Securitization Trust 2004-9