{"cik":"0001343149","entityType":"operating","sic":"6189","sicDescription":"Asset-Backed Securities","ownerOrg":null,"insiderTransactionForOwnerExists":0,"insiderTransactionForIssuerExists":0,"name":"MASTR ASSET BACKED SECURITIES TRUST 2005-AB1","tickers":[],"exchanges":[],"ein":null,"lei":null,"description":"","website":"","investorWebsite":"","category":"","fiscalYearEnd":"1231","stateOfIncorporation":"DE","stateOfIncorporationDescription":"DE","addresses":{"mailing":{"street1":"1285 AVENUE OF THE AMERICAS","street2":null,"city":"NEW YORK","stateOrCountry":"NY","zipCode":"10019","stateOrCountryDescription":"NY","isForeignLocation":null,"foreignStateTerritory":null,"country":null,"countryCode":null},"business":{"street1":"1285 AVE OF THE AMERICAS","street2":null,"city":"NEW YORK","stateOrCountry":"NY","zipCode":"10019","stateOrCountryDescription":"NY","isForeignLocation":null,"foreignStateTerritory":null,"country":null,"countryCode":null}},"phone":"2127132000","flags":"","formerNames":[],"filings":{"recent":{"accessionNumber":["0001056404-06-001666","0001056404-06-000896","0001056404-06-000162","0001056404-05-004040","0001162318-05-001002","0001162318-05-000984","0001125282-05-005631"],"filingDate":["2006-03-31","2006-01-27","2006-01-05","2005-11-30","2005-11-15","2005-11-10","2005-11-01"],"reportDate":["2005-12-31","","2005-12-27","2005-11-25","2005-11-15","2005-11-10",""],"acceptanceDateTime":["2006-03-31T18:06:07.000Z","2006-01-27T20:20:22.000Z","2006-01-05T12:23:17.000Z","2005-11-30T21:33:50.000Z","2005-11-15T19:18:33.000Z","2005-11-10T17:50:41.000Z","2005-11-01T22:55:54.000Z"],"act":["34","34","34","34","34","34","33"],"form":["10-K","15-15D","8-K","8-K","8-K","8-K","424B5"],"fileNumber":["333-124678-09","333-124678-09","333-124678-09","333-124678-09","333-124678-09","333-124678-09","333-124678-09"],"filmNumber":["06727020","06557476","06510461","051234689","051205949","051192799","051170994"],"items":["","","8.01,9.01","8.01,9.01","8.01,9.01","8.01,9.01",""],"core_type":["10-K","15-15D","8-K","8-K","8-K","8-K","424B5"],"size":[174280,4195,90886,82427,902787,40222,1136647],"isXBRL":[0,0,0,0,0,0,0],"isInlineXBRL":[0,0,0,0,0,0,0],"isXBRLNumeric":[null,null,null,null,null,null,null],"primaryDocument":["mab05ab1_10k-2005.txt","mab05ab1_15-2005.txt","mab05ab1_8k-200512.txt","mab05ab1_10511.txt","f730071form8k.htm","mabs2005ab18kforinsurancepol.htm","b409245_424b5.txt"],"primaryDocDescription":["","","","","CURRENT REPORT","CURRENT REPORT","PROSPECTUS SUPPLEMENT"]},"files":[]}}