~~Mortgage~~SECURITIES ~~Asset~~AND ~~Securitization~~EXCHANGE Transactions, Inc Mortgage Pass-Through Certificates Record Date: 4/30/03 Distribution Date: 5/27/03 MASTR Series: 2003-3 Contact: Customer Service - CTSLink Wells Fargo Bank Minnesota, 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-A1 55265KTG4 SEN 5.75000% 117,312,307.83 559,795.61 515,247.56 AR 55265KUN7 SEN 5.75000% 0.00 0.00 0.00 2-A1 55265KTH2 SEN 5.00000% 122,534,865.40 508,449.41 4,298,940.07 2-A2 55265KTJ8 SEN 5.00000% 14,729,442.79 61,118.74 591,872.54 2-A3 55265KTK5 SEN 5.00000% 29,162,000.00 121,005.57 0.00 2-A4 55265KTL3 SEN 5.00000% 242,182,686.10 1,004,919.24 9,444,581.42 3-A1 55265KTM1 SEN 8.50000% 2,095,511.76 14,781.79 152,359.33 3-A2 55265KTN9 SEN 4.75000% 49,864,209.42 196,562.48 2,958,685.27 3-A3 55265KTP4 SEN 1.92000% 12,466,052.36 19,863.16 739,671.32 3-A4 55265KTQ2 IO 6.58000% 0.00 68,072.69 0.00 3-A5 55265KTR0 SEN 5.50000% 3,707,000.00 16,920.12 0.00 3-A6 55265KTS8 SEN 4.12500% 99,982,834.64 342,268.92 322,176.64 3-A7 55265KTT6 SEN 1.82000% 45,825,465.54 69,214.38 147,664.29 3-A8 55265KTU3 IO 6.68000% 0.00 254,039.60 0.00 3-A9 55265KTV1 SEN 5.75000% 37,705,310.37 179,923.72 6,634,131.54 3-A10 55265KTW9 SEN 5.75000% 1,543,734.85 7,366.46 1,543,734.85 3-A11 55265KTX7 PO 0.00000% 1,784,047.51 0.00 371,721.20 3-A12 55265KTY5 SEN 5.50000% 989,488.36 4,516.39 206,168.16 3-A13 55265KTZ2 SEN 5.50000% 10,117,797.56 46,181.36 1,565,768.52 3-A14 55265KUA5 SEN 5.50000% 885,691.35 4,042.62 885,691.35 3-A15 55265KUB3 SEN 4.75000% 8,382,047.04 33,041.65 609,437.33 3-A16 55265KUC1 SEN 5.50000% 2,387,365.77 10,896.82 173,579.30 3-A17 55265KUD9 SEN 5.50000% 27,045,000.00 123,443.36 0.00 3-A18 55265KUE7 SEN 5.50000% 5,255,000.00 23,985.76 0.00 4-A1 55265KUG2 SEN 5.00000% 23,437,306.63 97,251.38 1,506,278.56 5-A1 55265KUH0 SEN 5.50000% 98,678,315.73 450,404.26 15,958,024.83 PO-1 55265KUK3 PO 0.00000% 408,666.89 0.00 393.02 PO-2 55265KUJ6 PO 0.00000% 146,927.09 0.00 587.53 AX-1 55265KUM9 IO 5.50000% 0.00 150,900.24 0.00 AX-2 55265KUV9 IO 5.00000% 0.00 62,295.88 0.00 AX-3 55265KUL1 IO 5.00000% 0.00 114,547.24 0.00 AX-4 55265KUW7 IO 5.50000% 0.00 68,875.52 0.00 B-1 55265KUP2 SUB 5.30565% 9,472,615.98 41,692.55 23,552.09 B-2 55265KUQ0 SUB 5.30565% 3,489,386.13 15,358.10 8,675.78 B-3 55265KUR8 SUB 5.30565% 2,991,614.92 13,167.22 7,438.15 B-4 55265KUS6 SUB 5.30565% 1,495,308.69 6,581.42 3,717.84 B-5 55265KUT4 SUB 5.30565% 997,537.49 4,390.54 2,480.21 B-6 55265KUU1 SUB 5.30565% 1,495,666.81 6,582.99 3,718.73 Totals 978,571,205.01 4,702,457.19 48,676,297.43COMMISSION

~~Certificateholder Distribution Summary (continued) Current Ending Cumulative Realized Certificate Total Realized Class Loss Balance Distribution Losses 1-A1 0.00 116~~Washington,~~797,060.27~~ ~~1,075,043~~D.~~17 0~~C.00 AR 0.00 0.00 0.00 0.00 2-A1 0.00 118,235,925.33 4,807,389.48 0.00 2-A2 0.00 14,137,570.25 652,991.28 0.00 2-A3 0.00 29,162,000.00 121,005.57 0.00 2-A4 0.00 232,738,104.67 10,449,500.66 0.00 3-A1 0.00 1,943,152.43 167,141.12 0.00 3-A2 0.00 46,905,524.15 3,155,247.75 0.00 3-A3 0.00 11,726,381.04 759,534.48 0.00 3-A4 0.00 0.00 68,072.69 0.00 3-A5 0.00 3,707,000.00 16,920.12 0.00 3-A6 0.00 99,660,658.00 664,445.56 0.00 3-A7 0.00 45,677,801.25 216,878.67 0.00 3-A8 0.00 0.00 254,039.60 0.00 3-A9 0.00 31,071,178.83 6,814,055.26 0.00 3-A10 0.00 0.00 1,551,101.31 0.00 3-A11 0.00 1,412,326.31 371,721.20 0.00 3-A12 0.00 783,320.19 210,684.55 0.00 3-A13 0.00 8,552,029.04 1,611,949.88 0.00 3-A14 0.00 0.00 889,733.97 0.00 3-A15 0.00 7,772,609.70 642,478.98 0.00 3-A16 0.00 2,213,786.47 184,476.12 0.00 3-A17 0.00 27,045,000.00 123,443.36 0.00 3-A18 0.00 5,255,000.00 23,985.76 0.00 4-A1 0.00 21,931,028.08 1,603,529.94 0.00 5-A1 0.00 82,720,290.90 16,408,429.09 0.00 PO-1 0.00 408,273.88 393.02 0.00 PO-2 0.00 146,339.56 587.53 0.00 AX-1 0.00 0.00 150,900.24 0.00 AX-2 0.00 0.00 62,295.88 0.00 AX-3 0.00 0.00 114,547.24 0.00 AX-4 0.00 0.00 68,875.52 0.00 B-1 0.00 9,449,063.89 65,244.64 0.00 B-2 0.00 3,480,710.35 24,033.88 0.00 B-3 0.00 2,984,176.77 20,605.37 0.00 B-4 0.00 1,491,590.86 10,299.26 0.00 B-5 0.00 995,057.28 6,870.75 0.00 B-6 0.00 1,491,948.08 10,301.72 0.00 Totals 0.00 929,894,907.58 53,378,754.62 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-A1 117,469,000.00 117,312,307.83 117,039.20 398,208.36 0.00 0.00 AR 100.00 0.00 0.00 0.00 0.00 0.00 2-A1 124,500,000.00 122,534,865.40 448,720.40 3,850,219.68 0.00 0.00 2-A2 15,000,000.00 14,729,442.79 61,779.25 530,093.30 0.00 0.00 2-A3 29,162,000.00 29,162,000.00 0.00 0.00 0.00 0.00 2-A4 246,500,000.00 242,182,686.10 985,818.89 8~~,458,762.54 0.00 0.00 3~~-A1 2,154,000.00 2,095,511.76 2,868.24 149,491.09 0.00 0.00 3-A2 51,000,000.00 49,864,209.42 55,698.68 2,902,986.59 0.00 0.00 3-A3 12,750,000.00 12,466,052.36 13,924.67 725,746.65 0.00 0.00 3-A4 0.00 0.00 0.00 0.00 0.00 0.00 3-A5 3,707,000.00 3,707,000.00 0.00 0.00 0.00 0.00 3-A6 100,000,000.00 99,982,834.64 6,065.13 316,111.51 0.00 0.00 3-A7 45,833,333.00 45,825,465.54 2,779.85 144,884.44 0.00 0.00 3-A8 0.00 0.00 0.00 0.00 0.00 0.00 3-A9 38,000,000.00 37,705,310.37 124,890.73 6,509,240.80 0.00 0.00 3-A10 1,666,000.00 1,543,734.85 29,200.23 1,521,901.08 (7,366.46) 0.00 3-A11 1,803,000.00 1,784,047.51 6,997.83 364,723.37 0.00 0.00 3-A12 1,000,000.00 989,488.36 3,881.22 202,286.95 0.00 0.00 3-A13 10,200,000.00 10,117,797.56 29,476.35 1,536,292.17 0.00 0.00 3-A14 4,814,667.00 885,691.35 16,749.67 872,984.30 (4,042.62) 0.00 3-A15 8,616,000.00 8,382,047.04 11,472.95 597,964.38 0.00 0.00 3-A16 2,454,000.00 2,387,365.77 3,267.71 170,311.58 0.00 0.00 3-A17 27,045,000.00 27,045,000.00 0.00 0.00 0.00 0.00 3-A18 5,255,000.00 5,255,000.00 0.00 0.00 0.00 0.00 4-A1 25,000,000.00 23,437,306.63 84,774.78 1,421,503.78 0.00 0.00 5-A1 105,078,000.00 98,678,315.73 371,449.40 15,586,575.43 0.00 0.00 PO-1 409,262.93 408,666.89 393.02 0.00 0.00 0.00 PO-2 147,499.24 146,927.09 562.14 25.39 0.00 0.00 AX-1 0.00 0.00 0.00 0.00 0.00 0.00 AX-2 0.00 0.00 0.00 0.00 0.00 0.00 AX-3 0.00 0.00 0.00 0.00 0.00 0.00 AX-4 0.00 0.00 0.00 0.00 0.00 0.00 B-1 9,496,000.00 9,472,615.98 23,552.09 0.00 0.00 0.00 B-2 3,498,000.00 3,489,386.13 8,675.78 0.00 0.00 0.00 B-3 2,999,000.00 2,991,614.92 7,438.15 0.00 0.00 0.00 B-4 1,499,000.00 1,495,308.69 3,717.84 0.00 0.00 0.00 B-5 1,000,000.00 997,537.49 2,480.21 0.00 0.00 0.00 B-6 1,499,359.00 1,495,666.81 3,718.73 0.00 0.00 0.00 Totals 999,555,221.17 978,571,205.01 2,427,393.14 46,260,313.39 (11,409.08) 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-A1 515,247.56 116,797,060.27 0.99427985 515,247.56 AR 0.00 0.00 0.00000000 0.00 2-A1 4,298,940.07 118,235,925.33 0.94968615 4,298,940.07 2-A2 591,872.54 14,137,570.25 0.94250468 591,872.54 2-A3 0.00 29,162,000.00 1.00000000 0.00 2-A4 9,444,581.42 232,738,104.67 0.94417081 9,444,581.42 3-A1 152,359.33 1,943,152.43 0.90211348 152,359.33 3-A2 2,958,685.27 46,905,524.15 0.91971616 2,958,685.27 3-A3 739,671.32 11,726,381.04 0.91971616 739,671.32 3-A4 0.00 0.00 0.00000000 0.00 3-A5 0.00 3,707,000.00 1.00000000 0.00 3-A6 322,176.64 99,660,658.00 0.99660658 322,176.64 3-A7 147,664.29 45,677,801.25 0.99660658 147,664.29 3-A8 0.00 0.00 0.00000000 0.00 3-A9 6,634,131.54 31,071,178.83 0.81766260 6,634,131.54 3-A10 1,543,734.85 0.00 0.00000000 1,543,734.85 3-A11 371,721.20 1,412,326.31 0.78332019 371,721.20 3-A12 206,168.16 783,320.19 0.78332019 206,168.16 3-A13 1,565,768.52 8,552,029.04 0.83843422 1,565,768.52 3-A14 885,691.35 0.00 0.00000000 885,691.35 3-A15 609,437.33 7,772,609.70 0.90211347 609,437.33 3-A16 173,579.30 2,213,786.47 0.90211348 173,579.30 3-A17 0.00 27,045,000.00 1.00000000 0.00 3-A18 0.00 5,255,000.00 1.00000000 0.00 4-A1 1,506,278.56 21,931,028.08 0.87724112 1,506,278.56 5-A1 15,958,024.83 82,720,290.90 0.78722750 15,958,024.83 PO-1 393.02 408,273.88 0.99758334 393.02 PO-2 587.53 146,339.56 0.99213772 587.53 AX-1 0.00 0.00 0.00000000 0.00 AX-2 0.00 0.00 0.00000000 0.00 AX-3 0.00 0.00 0.00000000 0.00 AX-4 0.00 0.00 0.00000000 0.00 B-1 23,552.09 9,449,063.89 0.99505728 23,552.09 B-2 8,675.78 3,480,710.35 0.99505728 8,675.78 B-3 7,438.15 2,984,176.77 0.99505728 7,438.15 B-4 3,717.84 1,491,590.86 0.99505728 3,717.84 B-5 2,480.21 995,057.28 0.99505728 2,480.21 B-6 3,718.73 1,491,948.08 0.99505727 3,718.73 Totals 48,676,297.43 929,894,907.58 0.93030869 48,676,297.43REPORT

~~Principal~~Pursuant ~~Distribution~~to ~~Factors~~Section ~~Statement~~13 ~~Original~~or Beginning Scheduled Unscheduled Face Certificate Principal Principal Class (2) Amount Balance Distribution Distribution Accretion 1-A1 117,469,000.00 998.66609769 0.99634116 3.38990168 0.00000000 AR 100.00 0.00000000 0.00000000 0.00000000 0.00000000 2-A1 124,500,000.00 984.21578635 3.60417992 30.92545928 0.00000000 2-A2 15,000,000.00 981.96285267 4.11861667 35.33955333 0.00000000 2-A3 29,162,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 2-A4 246,500,000.00 982.48554199 3.99926527 34.31546669 0.00000000 3-A1 2,154,000.00 972.84668524 1.33158774 69.40162024 0.00000000 3-A2 51,000,000.00 977.72959647 1.09213098 56.92130569 0.00000000 3-A3 12,750,000.00 977.72959686 1.09213098 56.92130588 0.00000000 3-A4 0.00 0.00000000 0.00000000 0.00000000 0.00000000 3-A5 3,707,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 3-A6 100,000,000.00 999.82834640 0.06065130 3.16111510 0.00000000 3-A7 45,833,333.00 999.82834633 0.06065127 3.16111508 0.00000000 3-A8 0.00 0.00000000 0.00000000 0.00000000 0.00000000 3-A9 38,000,000.00 992.24500974 3.28659816 171.29581053 0.00000000 3-A10 1,666,000.00 926.61155462 17.52714886 913.50605042 (~~4.42164466~~d) ~~3-A11~~of 1,803,000.00 989.48835829 3.88121464 202.28694953 0.00000000 3-A12 1,000,000.00 989.48836000 3.88122000 202.28695000 0.00000000 3-A13 10,200,000.00 991.94093725 2.88983824 150.61687941 0.00000000 3-A14 4,814,667.00 183.95692786 3.47888442 181.31769030 (0.83964685) 3-A15 8,616,000.00 972.84668524 1.33158658 69.40162256 0.00000000 3-A16 2,454,000.00 972.84668704 1.33158517 69.40162184 0.00000000 3-A17 27,045,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 3-A18 5,255,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 4-A1 25,000,000.00 937.49226520 3.39099120 56.86015120 0.00000000 5-A1 105,078,000.00 939.09586907 3.53498734 148.33338501 0.00000000 PO-1 409,262.93 998.54362573 0.96031175 0.00000000 0.00000000 PO-2 147,499.24 996.12099696 3.81113828 0.17213648 0.00000000 AX-1 0.00 0.00000000 0.00000000 0.00000000 0.00000000 AX-2 0.00 0.00000000 0.00000000 0.00000000 0.00000000 AX-3 0.00 0.00000000 0.00000000 0.00000000 0.00000000 AX-4 0.00 0.00000000 0.00000000 0.00000000 0.00000000 B-1 9,496,000.00 997.53748736 2.48021167 0.00000000 0.00000000 B-2 3,498,000.00 997.53748714 2.48021155 0.00000000 0.00000000 B-3 2,999,000.00 997.53748583 2.48021007 0.00000000 0.00000000 B-4 1,499,000.00 997.53748499 2.48021348 0.00000000 0.00000000 B-5 1,000,000.00 997.53749000 2.48021000 0.00000000 0.00000000 B-6 1,499,359.00 997.53748769 2.48021321 0.00000000 0.00000000 (2) All Classes are per $1,000 denominationthe

~~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-A1 0.00000000 4.38624284 994.27985486 0.99427985 4.38624284 AR 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 2-A1 0.00000000 34.52963912 949.68614723 0.94968615 34.52963912 2-A2 0.00000000 39.45816933 942.50468333 0.94250468 39.45816933 2-A3 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 2-A4 0.00000000 38.31473193 944.17081002 0.94417081 38.31473193 3-A1 0.00000000 70.73320799 902.11347725 0.90211348 70.73320799 3-A2 0.00000000 58.01343667 919.71615980 0.91971616 58.01343667 3-A3 0.00000000 58.01343686 919.71616000 0.91971616 58.01343686 3-A4 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 3-A5 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 3-A6 0.00000000 3.22176640 996.60658000 0.99660658 3.22176640 3-A7 0.00000000 3.22176635 996.60657998 0.99660658 3.22176635 3-A8 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 3-A9 0.00000000 174.58240895 817.66260079 0.81766260 174.58240895 3-A10 0.00000000 926.61155462 0.00000000 0.00000000 926.61155462 3-A11 0.00000000 206.16816417 783.32019412 0.78332019 206.16816417 3-A12 0.00000000 206.16816000 783.32019000 0.78332019 206.16816000 3-A13 0.00000000 153.50671765 838.43421961 0.83843422 153.50671765 3-A14 0.00000000 183.95692786 0.00000000 0.00000000 183.95692786 3-A15 0.00000000 70.73320915 902.11347493 0.90211347 70.73320915 3-A16 0.00000000 70.73321108 902.11347596 0.90211348 70.73321108 3-A17 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 3-A18 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 4-A1 0.00000000 60.25114240 877.24112320 0.87724112 60.25114240 5-A1 0.00000000 151.86837235 787.22749672 0.78722750 151.86837235 PO-1 0.00000000 0.96031175 997.58333842 0.99758334 0.96031175 PO-2 0.00000000 3.98327476 992.13772220 0.99213772 3.98327476 AX-1 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 AX-2 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 AX-3 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 AX-4 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 B-1 0.00000000 2.48021167 995.05727570 0.99505728 2.48021167 B-2 0.00000000 2.48021155 995.05727559 0.99505728 2.48021155 B-3 0.00000000 2.48021007 995.05727576 0.99505728 2.48021007 B-4 0.00000000 2.48021348 995.05727819 0.99505728 2.48021348 B-5 0.00000000 2.48021000 995.05728000 0.99505728 2.48021000 B-6 0.00000000 2.48021321 995.05727448 0.99505727 2.48021321 (3) Amount Does Not Include Excess Special Hazard, Bankrupcy, or Fraud Losses Unless Otherwise Disclosed. Please Refer to the Prospectus Supplement for a Full Description.1934

~~Interest~~Date ~~Distribution~~of ~~Statement~~Report ~~Beginning~~(Date ~~Payment~~ of ~~Original~~earliest Current Certificate/ Current Unpaid Current Face Certificate Notional Accrued Interest Interest Class Amount Rate Balance Interest Shortfall Shortfall 1-A1 117,469,000.00 5.75000% 117,312,307.83 562,121.48 0.00 0.00 AR 100.00 5.75000% 0.00 0.00 0.00 0.00 2-A1 124,500,000.00 5.00000% 122,534,865.40 510,561.94 0.00 0.00 2-A2 15,000,000.00 5.00000% 14,729,442.79 61,372.68 0.00 0.00 2-A3 29,162,000.00 5.00000% 29,162,000.00 121,508.33 0.00 0.00 2-A4 246,500,000.00 5.00000% 242,182,686.10 1,009,094.53 0.00 0.00 3-A1 2,154,000.00 8.50000% 2,095,511.76 14,843.21 0.00 0.00 3-A2 51,000,000.00 4.75000% 49,864,209.42 197,379.16 0.00 0.00 3-A3 12,750,000.00 1.92000% 12,466,052.36 19,945.68 0.00 0.00 3-A4 0.00 6.58000% 12,466,052.36 68,355.52 0.00 0.00 3-A5 3,707,000.00 5.50000% 3,707,000.00 16,990.42 0.00 0.00 3-A6 100,000,000.00 4.12500% 99,982,834.64 343,690.99 0.00 0.00 3-A7 45,833,333.00 1.82000% 45,825,465.54 69,501.96 0.00 0.00 3-A8 0.00 6.68000% 45,825,465.54 255,095.09 0.00 0.00 3-A9 38,000,000.00 5.75000% 37,705,310.37 180,671.28 0.00 0.00 3-A10 1,666,000.00 5.75000% 1,543,734.85 7,397.06 0.00 0.00 3-A11 1,803,000.00 0.00000% 1,784,047.51 0.00 0.00 0.00 3-A12 1,000,000.00 5.50000% 989,488.36 4,535.15 0.00 0.00 3-A13 10,200,000.00 5.50000% 10,117,797.56 46,373.24 0.00 0.00 3-A14 4,814,667.00 5.50000% 885,691.35 4,059.42 0.00 0.00 3-A15 8,616,000.00 4.75000% 8,382,047.04 33,178.94 0.00 0.00 3-A16 2,454,000.00 5.50000% 2,387,365.77 10,942.09 0.00 0.00 3-A17 27,045,000.00 5.50000% 27,045,000.00 123,956.25 0.00 0.00 3-A18 5,255,000.00 5.50000% 5,255,000.00 24,085.42 0.00 0.00 4-A1 25,000,000.00 5.00000% 23,437,306.63 97,655.44 0.00 0.00 5-A1 105,078,000.00 5.50000% 98,678,315.73 452,275.61 0.00 0.00 PO-1 409,262.93 0.00000% 408,666.89 0.00 0.00 0.00 PO-2 147,499.24 0.00000% 146,927.09 0.00 0.00 0.00 AX-1 0.00 5.50000% 33,060,481.99 151,527.21 0.00 0.00 AX-2 0.00 5.00000% 15,013,130.68 62,554.71 0.00 0.00 AX-3 0.00 5.00000% 27,605,560.73 115,023.17 0.00 0.00 AX-4 0.00 5.50000% 15,089,823.22 69,161.69 0.00 0.00 B-1 9,496,000.00 5.30565% 9,472,615.98 41,882.01 0.00 0.00 B-2 3,498,000.00 5.30565% 3,489,386.13 15,427.89 0.00 0.00 B-3 2,999,000.00 5.30565% 2,991,614.92 13,227.06 0.00 0.00 B-4 1,499,000.00 5.30565% 1,495,308.69 6,611.32 0.00 0.00 B-5 1,000,000.00 5.30565% 997,537.49 4,410.49 0.00 0.00 B-6 1,499,359.00 5.30565% 1,495,666.81 6,612.91 0.00 0.00 Totals 999,555,221.17 4,722,029.35 0.00 0.00event

~~Interest Distribution Statement (continued~~Reported): June Remaining Ending Non-Supported Total Unpaid Certificate/ Interest Realized Interest Interest Notional Class Shortfall Losses (4) Distribution Shortfall Balance 1-A1 2,325.86 0.00 559,795.61 0.00 116,797,060.27 AR 0.00 0.00 0.00 0.00 0.00 2-A1 2,112.53 0.00 508,449.41 0.00 118,235,925.33 2-A2 253.94 0.00 61,118.74 0.00 14,137,570.25 2-A3 502.76 0.00 121,005.57 0.00 29,162,000.00 2-A4 4,175.28 0.00 1,004,919.24 0.00 232,738,104.67 3-A1 61.42 0.00 14,781.79 0.00 1,943,152.43 3-A2 816.69 0.00 196,562.48 0.00 46,905,524.15 3-A3 82.53 0.00 19,863.16 0.00 11,726,381.04 3-A4 282.83 0.00 68,072.69 0.00 11,726,381.04 3-A5 70.30 0.00 16,920.12 0.00 3,707,000.00 3-A6 1,422.07 0.00 342,268.92 0.00 99,660,658.00 3-A7 287.57 0.00 69,214.38 0.00 45,677,801.25 3-A8 1,055.49 0.00 254,039.60 0.00 45,677,801.25 3-A9 747.55 0.00 179,923.72 0.00 31,071,178.83 3-A10 30.61 0.00 7,366.46 0.00 0.00 3-A11 0.00 0.00 0.00 0.00 1,412,326.31 3-A12 18.76 0.00 4,516.39 0.00 783,320.19 3-A13 191.88 0.00 46,181.36 0.00 8,552,029.04 3-A14 16.80 0.00 4,042.62 0.00 0.00 3-A15 137.28 0.00 33,041.65 0.00 7,772,609.70 3-A16 45.27 0.00 10,~~896.82~~ ~~0.00~~2003 MORTGAGE ~~2,213,786.47~~ASSET ~~3-A17~~SECURITIZATION ~~512.89 0.00 123~~TRANSACTIONS,~~443.36~~ 0INC.00 27,045,000.00 3-A18 99.66 0.00 23,985.76 0.00 5,255,000.00 4-A1 404.06 0.00 97,251.38 0.00 21,931,028.08 5-A1 1,871.36 0.00 450,404.26 0.00 82,720,290.90 PO-1 0.00 0.00 0.00 0.00 408,273.88 PO-2 0.00 0.00 0.00 0.00 146,339.56 AX-1 626.97 0.00 150,900.24 0.00 31,234,626.91 AX-2 258.83 0.00 62,295.88 0.00 13,901,157.34 AX-3 475.93 0.00 114,547.24 0.00 26,914,396.82 AX-4 286.17 0.00 68,875.52 0.00 12,560,089.45 B-1 189.46 0.00 41,692.55 0.00 9,449,063.89 B-2 69.79 0.00 15,358.10 0.00 3,480,710.35 B-3 59.83 0.00 13,167.22 0.00 2,984,176.77 B-4 29.91 0.00 6,581.42 0.00 1,491,590.86 B-5 19.95 0.00 4,390.54 0.00 995,057.28 B-6 29.91 0.00 6,582.99 0.00 1,491,948.08 Totals 19,572.14 0.00 4,702,457.19 0.00 (4)as ~~Amount~~depositor ~~Does~~under ~~Not Include Excess Special Hazard, Bankrupcy, or Fraud Losses Unless Otherwise Disclosed. Please Refer to~~ the ~~Prospectus Supplement for a Full Description.~~

~~Interest~~Pooling ~~Distribution~~and ~~Factors~~Servicing Statement Beginning Payment of Original Current Certificate/ Current Unpaid Current Face Certificate Notional Accrued Interest Interest Class (5) Amount Rate Balance Interest Shortfall Shortfall 1-A1 117Agreement,~~469,000.00~~ ~~5.75000%~~relating ~~998.66609769~~to ~~4.78527509~~the ~~0.00000000~~MASTR ~~0.00000000~~Asset ARSecuritization ~~100.00~~Trust ~~5.75000% 0.00000000 0.00000000 0.00000000 0.00000000 2~~2003-A1 124,500,000.00 5.00000% 984.21578635 4.10089912 0.00000000 0.00000000 2-A2 15,000,000.00 5.00000% 981.96285267 4.09151200 0.00000000 0.00000000 2-A3 29,162,000.00 5.00000% 1000.00000000 4.16666655 0.00000000 0.00000000 2-A4 246,500,000.00 5.00000% 982.48554199 4.09368978 0.00000000 0.00000000 3-A1 2,154,000.00 8.50000% 972.84668524 6.89099814 0.00000000 0.00000000 3-A2 51,000,000.00 4.75000% 977.72959647 3.87017961 0.00000000 0.00000000 3-A3 12,750,000.00 1.92000% 977.72959686 1.56436706 0.00000000 0.00000000 3-A4 0.00 6.58000% 977.72959686 5.36121725 0.00000000 0.00000000 3-A5 3,707,000.00 5.50000% 1000.00000000 4.58333423 0.00000000 0.00000000 3-A6 100,000,000.00 4.12500% 999.82834640 3.43690990 0.00000000 0.00000000 3-A7 45,833,333.00 1.82000% 999.82834633 1.51640641 0.00000000 0.00000000 3-A8 0.00 6.68000% 999.82834633 5.56571110 0.00000000 0.00000000 3-A9 38,000,000.00 5.75000% 992.24500974 4.75450737 0.00000000 0.00000000 3-A10 1,666,000.00 5.75000% 926.61155462 4.44001200 0.00000000 0.00000000 3-A11 1,803,000.00 0.00000% 989.48835829 0.00000000 0.00000000 0.00000000 3-A12 1,000,000.00 5.50000% 989.48836000 4.53515000 0.00000000 0.00000000 3-A13 10,200,000.00 5.50000% 991.94093725 4.54639608 0.00000000 0.00000000 3-A14 4,814,667.00 5.50000% 183.95692786 0.84313619 0.00000000 0.00000000 3-A15 8,616,000.00 4.75000% 972.84668524 3.85085190 0.00000000 0.00000000 3-A16 2,454,000.00 5.50000% 972.84668704 4.45887938 0.00000000 0.00000000 3-A17 27,045,000.00 5.50000% 1000.00000000 4.58333333 0.00000000 0.00000000 3-A18 5,255,000.00 5.50000% 1000.00000000 4.58333397 0.00000000 0.00000000 4-A1 25,000,000.00 5.00000% 937.49226520 3.90621760 0.00000000 0.00000000 5-A1 105,078,000.00 5.50000% 939.09586907 4.30418936 0.00000000 0.00000000 PO-1 409,262.93 0.00000% 998.54362573 0.00000000 0.00000000 0.00000000 PO-2 147,499.24 0.00000% 996.12099696 0.00000000 0.00000000 0.00000000 AX-1 0.00 5.50000% 976.32384202 4.47481764 0.00000000 0.00000000 AX-2 0.00 5.00000% 965.88037367 4.02450148 0.00000000 0.00000000 AX-3 0.00 5.00000% 980.48801810 4.08536675 0.00000000 0.00000000 AX-4 0.00 5.50000% 938.19872811 4.30007752 0.00000000 0.00000000 B-1 9,496,000.00 5.30565% 997.53748736 4.41048968 0.00000000 0.00000000 B-2 3,498,000.00 5.30565% 997.53748714 4.41048885 0.00000000 0.00000000 B-3 2,999,000.00 5.30565% 997.53748583 4.41049016 0.00000000 0.00000000 B-4 1,499,000.00 5.30565% 997.53748499 4.41048699 0.00000000 0.00000000 B-5 1,000,000.00 5.30565% 997.53749000 4.41049000 0.00000000 0.00000000 B-6 1,499,359.00 5.30565% 997.53748769 4.41049142 0.00000000 0.00000000 (5) All Classes are per $1,000 denomination

~~Interest~~Mortgage ~~Distribution Factors Statement (continued) Remaining Ending Non~~Pass-~~Supported~~Through ~~Total~~Certificates, ~~Unpaid~~Series ~~Certificate/ Interest Realized Interest Interest Notional Class Shortfall Losses (6) Distribution Shortfall Balance 1~~2003-A1 0.01979978 0.00000000 4.76547523 0.00000000 994.27985486 AR 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 2-A1 0.01696811 0.00000000 4.08393100 0.00000000 949.68614723 2-A2 0.01692933 0.00000000 4.07458267 0.00000000 942.50468333 2-A3 0.01724024 0.00000000 4.14942631 0.00000000 1000.00000000 2-A4 0.01693826 0.00000000 4.07675148 0.00000000 944.17081002 3-A1 0.02851439 0.00000000 6.86248375 0.00000000 902.11347725 3-A2 0.01601353 0.00000000 3.85416627 0.00000000 919.71615980 3-A3 0.00647294 0.00000000 1.55789490 0.00000000 919.71616000 3-A4 0.02218275 0.00000000 5.33903451 0.00000000 919.71616000 3-A5 0.01896412 0.00000000 4.56437011 0.00000000 1000.00000000 3-A6 0.01422070 0.00000000 3.42268920 0.00000000 996.60658000 3-A7 0.00627425 0.00000000 1.51013194 0.00000000 996.60657998 3-A8 0.02302887 0.00000000 5.54268222 0.00000000 996.60657998 3-A9 0.01967237 0.00000000 4.73483474 0.00000000 817.66260079 3-A10 0.01837335 0.00000000 4.42164466 0.00000000 0.00000000 3-A11 0.00000000 0.00000000 0.00000000 0.00000000 783.32019412 3-A12 0.01876000 0.00000000 4.51639000 0.00000000 783.32019000 3-A13 0.01881176 0.00000000 4.52758431 0.00000000 838.43421961 3-A14 0.00348934 0.00000000 0.83964685 0.00000000 0.00000000 3-A15 0.01593315 0.00000000 3.83491760 0.00000000 902.11347493 3-A16 0.01844743 0.00000000 4.44043195 0.00000000 902.11347596 3-A17 0.01896432 0.00000000 4.56436901 0.00000000 1000.00000000 3-A18 0.01896480 0.00000000 4.56436917 0.00000000 1000.00000000 4-A1 0.01616240 0.00000000 3.89005520 0.00000000 877.24112320 5-A1 0.01780925 0.00000000 4.28638021 0.00000000 787.22749672 PO-1 0.00000000 0.00000000 0.00000000 0.00000000 997.58333842 PO-2 0.00000000 0.00000000 0.00000000 0.00000000 992.13772220 AX-1 0.01851533 0.00000000 4.45630230 0.00000000 922.40370113 AX-2 0.01665201 0.00000000 4.00784947 0.00000000 894.34078289 AX-3 0.01690397 0.00000000 4.06846278 0.00000000 955.93941577 AX-4 0.01779241 0.00000000 4.28228511 0.00000000 780.91438019 B-1 0.01995156 0.00000000 4.39053812 0.00000000 995.05727570 B-2 0.01995140 0.00000000 4.39053745 0.00000000 995.05727559 B-3 0.01994998 0.00000000 4.39053685 0.00000000 995.05727576 B-4 0.01995330 0.00000000 4.39054036 0.00000000 995.05727819 B-5 0.01995000 0.00000000 4.39054000 0.00000000 995.05728000 B-6 0.01994852 0.00000000 4.39053622 0.00000000 995.05727448 (6) ~~Amount Does Not Include Excess Special Hazard, Bankrupcy,or Fraud Losses Unless Otherwise Disclosed. Please Refer to the Prospectus Supplement for a Full Description.~~

CERTIFICATEHOLDER ACCOUNT STATEMENT CERTIFICATE ACCOUNT Beginning Balance 0.00 Deposits Payments of Interest and Principal 53,461,239.79 Liquidations, Insurance Proceeds, Reserve Funds 0.00 Proceeds from Repurchased Loans 0.00 Other Amounts (Servicer Advances) 125,101.93 Realized Losses 0.00 Prepayment Penalties 0.00 Total Deposits 53,586,341.72 Withdrawals Reimbursement for Servicer Advances 0.00 Payment of Service Fee 207,587.10 Payment of Interest and Principal 53,378,754.62 Total Withdrawals (Pool Distribution Amount) 53,586,341.72 Ending Balance 0.00

MORTGAGE ASSET SECURITIZATION TRANSACTIONS, INC.
(Exact name of registrant as specified in its charter)

Delaware	333-101254	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

~~PREPAYMENT/CURTAILMENT~~Item ~~INTEREST SHORTFALL Total Prepayment/Curtailment Interest Shortfall 19,572~~5.~~14 Servicing Fee Support 0.00 Non-Supported Prepayment/Curtailment Interest Shortfall 19,572.14~~

~~SERVICING~~Other ~~FEES Gross Servicing Fee 206,135~~Events.~~71 Master Servicing Fee 1,451.39 Supported Prepayment/Curtailment Interest Shortfall 0.00 Net Servicing Fee 207,587.10~~

~~LOAN~~Master ~~STATUS~~Asset ~~STRATIFICATION/CREDIT~~Securitization ~~ENHANCEMENT~~Transactions, ~~STATEMENT~~Inc. ~~DELINQUENCY~~(the ~~STATUS~~“Company”) ~~DELINQUENT~~entered ~~BANKRUPTCY~~into ~~FORECLOSURE~~a ~~REO~~Pooling ~~Total~~and NoServicing ofAgreement ~~Loans~~dated Noas of ~~Loans~~March No1, of2003 ~~Loans~~(the No“Agreement”) ofamong ~~Loans~~the NoCompany, ofin ~~Loans~~its ~~Principal~~capacity ~~Balance~~as ~~Principal~~depositor ~~Balance~~(in ~~Principal~~such ~~Balance~~capacity, ~~Principal~~the ~~Balance~~“Depositor”), ~~Principal~~UBS ~~Balance~~Warburg ~~0-29~~Real ~~Days~~Estate 0Securities ~~0 0 0 0~~Inc.00, ~~0.00~~as ~~0.00~~transferor ~~0.00~~(in 30such ~~Days 32 0 0 0 32 15~~capacity,~~827,828.55~~ ~~0.00~~the ~~0.00 0.00 15~~“Transferor”),~~827,828.55~~ 60Wells ~~Days~~Fargo 2Bank ~~0 0 0 2 736~~Minnesota,~~844.61~~ 0N.~~00 0~~A.~~00 0.00 736~~,~~844.61~~ 90as ~~Days~~master 0servicer 0(in 0such 0capacity, 0the ~~0.00~~“Master ~~0.00~~Servicer”) ~~0.00~~and ~~0.00~~JPMorgan ~~0.00~~Chase ~~120~~Bank, ~~Days~~as 0trustee 0(in 0such 0capacity, 0the 0“Trustee”).00 The ~~0.00~~Certificates ~~0.00~~were ~~0.00~~issued ~~0.00~~on ~~150~~March ~~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 34 0 0 0 34 16~~28,~~564,673.16~~ 02003.00 The ~~0.00~~Pooling ~~0.00~~and ~~16,564,673.16~~Servicing NoAgreement ofis ~~Loans~~annexed Nohereto ofas ~~Loans~~Exhibit ~~No of Loans No of Loans No of Loans Principal Balance Principal Balance Principal Balance Principal Balance Principal Balance 0-29 Days 0~~99.~~000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 30 Days~~ 1.594420% 0.000000% 0.000000% 0.000000% 1.594420% 1.698761% 0.000000% 0.000000% 0.000000% 1.698761% 60 Days 0.099651% 0.000000% 0.000000% 0.000000% 0.099651% 0.079084% 0.000000% 0.000000% 0.000000% 0.079084% 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 1.694071% 0.000000% 0.000000% 0.000000% 1.694071% 1.777845% 0.000000% 0.000000% 0.000000% 1.777845%

~~Delinquency~~Item Status By Groups DELINQUENT BANKRUPTCY FORECLOSURE REO Total Group 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 3 0 0 0 3 1,497,904.43 0.00 0.00 0.00 1,497,904.43 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 3 0 0 0 3 1,497,904.43 0.00 0.00 0.00 1,497,904.43 0-29 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 30 Days 1.304348% 0.000000% 0.000000% 0.000000% 1.304348% 1.251511% 0.000000% 0.000000% 0.000000% 1.251511% 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 1.304348% 0.000000% 0.000000% 0.000000% 1.304348% 1.251511% 0.000000% 0.000000% 0.000000% 1.251511% DELINQUENT BANKRUPTCY FORECLOSURE REO Total Group 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 14 0 0 0 14 6,917,731.07 0.00 0.00 0.00 6,917,731.07 60 Days 1 0 0 0 1 348,200.00 0.00 0.00 0.00 348,200.00 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 15 0 0 0 15 7~~,265,931~~.07 Financial ~~0.00 0.00 0.00 7~~Statements,~~265,931.07~~ ~~0-29~~Pro ~~Days~~Forma ~~0.000000%~~Financial ~~0.000000%~~Information ~~0.000000%~~and 0Exhibits.000000% 0.000000% 0.000000% 0.000000% 0.000000% 30 Days 1.598174% 0.000000% 0.000000% 0.000000% 1.598174% 1.728682% 0.000000% 0.000000% 0.000000% 1.728682% 60 Days 0.114155% 0.000000% 0.000000% 0.000000% 0.114155% 0.087012% 0.000000% 0.000000% 0.000000% 0.087012% 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 1.712329% 0.000000% 0.000000% 0.000000% 1.712329% 1.815694% 0.000000% 0.000000% 0.000000% 1.815694% DELINQUENT BANKRUPTCY FORECLOSURE REO Total Group 3 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 10 0 0 0 10 4,525,007.23 0.00 0.00 0.00 4,525,007.23 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 10 0 0 0 10 4,525,007.23 0.00 0.00 0.00 4,525,007.23 0-29 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 30 Days 1.560062% 0.000000% 0.000000% 0.000000% 1.560062% 1.506139% 0.000000% 0.000000% 0.000000% 1.506139% 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 1.560062% 0.000000% 0.000000% 0.000000% 1.560062% 1.506139% 0.000000% 0.000000% 0.000000% 1.506139% DELINQUENT BANKRUPTCY FORECLOSURE REO Total Group 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 2 0 0 0 2 1,268,970.45 0.00 0.00 0.00 1,268,970.45 60 Days 1 0 0 0 1 388,644.61 0.00 0.00 0.00 388,644.61 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 3 0 0 0 3 1,657,615.06 0.00 0.00 0.00 1,657,615.06 0-29 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 30 Days 4.166667% 0.000000% 0.000000% 0.000000% 4.166667% 5.597433% 0.000000% 0.000000% 0.000000% 5.597433% 60 Days 2.083333% 0.000000% 0.000000% 0.000000% 2.083333% 1.714313% 0.000000% 0.000000% 0.000000% 1.714313% 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 6.250000% 0.000000% 0.000000% 0.000000% 6.250000% 7.311746% 0.000000% 0.000000% 0.000000% 7.311746% DELINQUENT BANKRUPTCY FORECLOSURE REO Total Group 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 3 0 0 0 3 1,618,215.37 0.00 0.00 0.00 1,618,215.37 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 3 0 0 0 3 1,618,215.37 0.00 0.00 0.00 1,618,215.37 0-29 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 30 Days 1.415094% 0.000000% 0.000000% 0.000000% 1.415094% 1.902191% 0.000000% 0.000000% 0.000000% 1.902191% 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 1.415094% 0.000000% 0.000000% 0.000000% 1.415094% 1.902191% 0.000000% 0.000000% 0.000000% 1.902191%

~~OTHER INFORMATION Current Period Class A Insufficient Funds 0.00 Principal Balance of Contaminated Properties 0.00 Periodic Advance 125,101.93~~(a)

~~CREDIT~~Not ~~ENHANCEMENT Original $ Original % Current $ Current % Bankruptcy 127,926~~applicable.00 0.01279829% 127,926.00 0.01375704% Fraud 9,995,552.00 0.99999998% 9,995,552.00 1.07491201% Special Hazard 9,995,552.00 0.99999998% 9,995,552.00 1.07491201% Limit of Subordinate's Exposure to Certain Types of Losses

~~COLLATERAL STATEMENT Collateral Description Fixed 15 & 30 Year Weighted Average Gross Coupon 6.045079% Weighted Average Pass-Through Rate 5.790519% Weighted Average Maturity~~(~~Stepdown Calculation~~ b) 254 Beginning Scheduled Collateral Loan Count 2,106 Number Of Loans Paid In Full 99 Ending Scheduled Collateral Loan Count 2,007 Beginning Scheduled Collateral Balance 978,571,205.44 Ending Scheduled Collateral Balance 929,894,908.00 Ending Actual Collateral Balance at 30-Apr-2003 931,727,644.84 Monthly P &I Constant 7,356,858.86 Special Servicing Fee 0.00 Prepayment Penalties 0.00 Realized Loss Amount 0.00 Cumulative Realized Loss 0.00 Class A Optimal Amount 52,887,870.57 Class AP Deferred Amount 0.00 Ending Scheduled Balance for Premium Loans 929,894,908.00 Scheduled Principal 2,427,242.28 Unscheduled Principal 46,249,055.16

~~Miscellaneous~~Not ~~Reporting Group 1 Senior % 97~~applicable.992396% Group 1 Junior % 2.007604% Group 1 Senior Prepayment % 100.000000% Group 2 Senior % 98.012060% Group 2 Junior % 1.987940% Group 2 Senior Prepayment % 100.000000% Group 3 Senior % 97.962193% Group 3 Junior % 2.037807% Group 3 Senior Prepayment % 100.000000% Group 4 Senior % 97.239113% Group 4 Junior % 2.760887% Group 4 Senior Prepayment % 100.000000% Group 5 Senior % 97.881022% Group 5 Junior % 2.118978% Group 5 Senior Prepayment % 100.000000%

Group Level Collateral Statement Group Group 1 Group 2 Group 3 Collateral Description Fixed 15 & 30 Year Fixed 15 Year Fixed 15 Year Weighted Average Coupon Rate 6.163498 5.736536 6.259939 Weighted Average Net Rate 5.913498 5.482899 6.009939 Weighted Average Maturity 355 175 355 Beginning Loan Count 231 902 674 Loans Paid In Full 1 26 33 Ending Loan Count 230 876 641 Beginning Scheduled Balance 120,106,568.33 417,043,575.20 316,503,751.08 Ending scheduled Balance 119,588,549.75 402,677,244.40 300,186,554.73 Record Date 04/30/2003 04/30/2003 04/30/2003 Principal And Interest Constant 736,771.32 3,520,884.51 1,964,544.29 Scheduled Principal 119,874.15 1,527,229.90 313,465.73 Unscheduled Principal 398,144.43 12,839,100.90 16,003,730.62 Scheduled Interest 616,897.17 1,993,654.61 1,651,078.56 Servicing Fees 25,022.21 88,148.11 65,938.26 Master Servicing Fees 0.00 161.77 1,289.62 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 591,874.96 1,905,344.73 1,583,850.68 Realized Loss Amount 0.00 0.00 0.00 Cumulative Realized Loss 0.00 0.00 0.00 Percentage of Cumulative Losses 0.00 0.00 0.00 Prepayment Penalties 0.00 0.00 0.00 Special Servicing Fee 0.00 0.00 0.00 Pass-Through Rate 5.913498 5.482434 6.005050(c)

Group Level Collateral Statement Group Group 4 Group 5 Total Collateral Description Fixed 15 & 30 Year Fixed 15 & 30 Year Fixed 15 & 30 Year Weighted Average Coupon Rate 5.763063 6.573235 6.045079 Weighted Average Net Rate 5.463137 6.323235 5.792299 Weighted Average Maturity 176 167 254 Beginning Loan Count 50 249 2,106 Loans Paid In Full 2 37 99 Ending Loan Count 48 212 2,007 Beginning Scheduled Balance 24,102,756.61 100,814,554.22 978,571,205.44 Ending scheduled Balance 22,594,071.06 84,848,488.06 929,894,908.00 Record Date 04/30/2003 04/30/2003 04/30/2003 Principal And Interest Constant 202,936.52 931,722.22 7,356,858.86 Scheduled Principal 87,181.77 379,490.73 2,427,242.28 Unscheduled Principal 1,421,503.78 15,586,575.43 46,249,055.16 Scheduled Interest 115,754.75 552,231.49 4,929,616.58 Servicing Fees 6,024.20 21,003.02 206,135.80 Master Servicing Fees 0.00 0.00 1,451.39 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 109,730.55 531,228.47 4,722,029.39 Realized Loss Amount 0.00 0.00 0.00 Cumulative Realized Loss 0.00 0.00 0.00 Percentage of Cumulative Losses 0.00 0.00 0.00 Prepayment Penalties 0.00 0.00 0.00 Special Servicing Fee 0.00 0.00 0.00 Pass-Through Rate 5.463137 6.323235 5.790519Exhibits:

99.1

The Pooling and Servicing Agreement dated as of March 1, 2003, by and among the Company, the Transferor, the Master Servicer and the Trustee.

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.

MORTGAGE ASSET SECURITIZATION

TRANSACTIONS, INC.

By: /s/ Eric Daouphars

Name: Eric Daouphars

Title: Director

By: /s/ Saro Cutri

Name: Saro Cutri

Title: Director

Dated: June 10, 2003_____

Exhibit Index

Exhibit

Page

99.1

Pooling and Servicing Agreement dated as of March 1, 2003,

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

the Trustee.

Filing Compare · MORTGAGE ASSET SEC TRANS INC MRT PS THR CERTS SER 2003-3