8-K 1 bam0300b_sep.txt SEPTEMBER 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D. C. 20549 FORM 8-K CURRENT REPORT Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): September 27, 2004 BANC OF AMERICA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 2003-B Trust (Exact name of registrant as specified in its charter) New York (governing law of 333-101500-05 54-2090868 Pooling and Servicing Agreement) (Commission 54-2102379 (State or other File Number) 54-2102380 jurisdiction IRS EIN of Incorporation) c/o Wells Fargo Bank, N.A. 9062 Old Annapolis Road Columbia, MD 21045 (Address of principal executive offices) (Zip Code) Registrant's telephone number, including area code: (410) 884-2000 (Former name or former address, if changed since last report) Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below): [ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425) [ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12) [ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act(17 CFR 240.14d-2(b)) [ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act(17 CFR 240.13e-4(c)) ITEM 8.01 Other Events On September 27, 2004 a distribution was made to holders of BANC OF AMERICA MORTGAGE SECURITIES, INC., Mortgage Pass-Through Certificates, Series 2003-B Trust. ITEM 9.01 Financial Statements and Exhibits (c) Exhibits Exhibit Number Description EX-99.1 Monthly report distributed to holders of Mortgage Pass-Through Certificates, Series 2003-B Trust, relating to the September 27, 2004 distribution. 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 hereunto duly authorized. BANC OF AMERICA MORTGAGE SECURITIES, INC. Mortgage Pass-Through Certificates, Series 2003-B Trust (Registrant) By: Wells Fargo Bank, N.A. as Trustee By: /s/ Beth Belfield as Assistant Vice President By: Beth Belfield as Assistant Vice President Date: 9/28/2004 INDEX TO EXHIBITS Exhibit Number Description EX-99.1 Monthly report distributed to holders of Mortgage Pass-Through Certificates, Series 2003-B Trust, relating to the September 27, 2004 distribution. EX-99.1

Banc of America Mortgage Securities, Inc. Mortgage Pass-Through Certificates Record Date: 78/31/2004 Distribution Date: 89/2527/2004 BAM Series: 2003-B 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 1A1 06050HC63 SEN 3.00200% 2928,~~178~~112,~~146~~616.5714 7270,~~994~~328.0040 14,~~065~~481,~~530~~190.4460 1AR 06050HC71 SEN 3.00200% 0.00 0.00 0.00 1AMR 06050HC89 SEN 3.00200% 0.00 0.00 0.00 1ALR 06050HC97 SEN 3.00200% 0.00 0.0304 0.00 2A1 06050HD21 SEN 4.41300% 3331,~~948~~924,~~928~~370.7810 ~~124~~117,~~847~~401.1987 21,~~024~~848,~~558~~660.6940 2A2 06050HD39 SEN 4.41300% ~~100~~94,~~896~~879,~~216~~227.3593 ~~371~~348,~~045~~918.8637 65,~~016~~494,~~988~~218.4171 2A3 06050HD47 SEN 1.68500% 0.00 0.00 0.00 2A4 06050HD54 SEN 2.88700% 0.00 0.00 0.00 2A5 06050HD62 SEN 3.63600% 0.00 0.00 0.00 2A6 06050HD70 SEN 4.10900% 3932,~~702~~344,~~721~~442.1537 ~~135~~110,~~948~~752.7476 76,~~358~~718,~~278~~974.7971 2A7 06050HD88 SEN 4.08000% 83,685,000.00 284,529.0200 0.00 2A8 06050HD96 SEN 4.41300% ~~950~~893,~~570~~882.0136 3,~~495~~287.7225 5651,~~687~~762.6449 2AIO 06050HE20 IO 0.02900% 0.00 2,022.39 0.00 2AP 06050HE38 PO 0.00000% ~~574~~570,~~164~~683.2403 0.00 ~~3,481~~657.2246 B1 06050HE46 SUB 4.~~13414~~13283% 9,~~928~~651,~~555~~064.8990 3433,~~205~~238.0447 ~~277~~323,~~490~~235.9973 B2 06050HE53 SUB 4.~~13414~~13283% 4,~~200~~083,~~710~~305.0332 14,~~471~~062.9499 ~~117~~136,~~404~~759.7102 B3 06050HE61 SUB 4.~~13414~~13283% 32,~~055~~969,~~140~~753.8540 10,~~525~~227.3289 8599,~~387~~463.4568 B4 06050HE95 SUB 4.~~13414~~13283% 1,~~527~~484,~~135~~454.8426 5,~~261~~112.1649 4249,~~681~~717.5869 B5 06050HF29 SUB 4.~~13414~~13283% 1,~~145~~113,~~569~~551.1792 3,~~946~~835.6210 3237,~~017~~295.2634 B6 06050HF37 SUB 4.~~13414~~13283% 1,~~527~~485,~~892~~190.8915 5,~~263~~115.7703 4249,~~702~~742.7434 WIO 06050HE87 IO 0.~~83493~~83784% 0.00 ~~205~~194,~~495~~663.2763 0.00 SES 06050HE79 SEN 0.00000% 0.00 5954,~~046~~770.7011 0.00 Totals ~~310~~293,~~320~~197,~~751~~541.7788 1,~~333~~258,~~098~~265.7779 1719,~~123~~291,~~209~~678.9217

Certificateholder Distribution Summary (continued) Current Ending Cumulative Realized Certificate Total Realized Class Loss Balance Distribution Losses 1A1 0.00 2823,~~112~~631,~~616~~425.1453 14,~~138~~551,~~524~~519.4400 0.00 1AR 0.00 0.00 0.00 0.00 1AMR 0.00 0.00 0.00 0.00 1ALR 0.00 0.00 0.0304 0.00 2A1 0.00 3130,~~924~~075,~~370~~709.1070 21,~~149~~966,~~405~~062.8827 0.00 2A2 0.00 9489,~~879~~385,~~227~~009.9322 65,~~388~~843,~~034~~137.2708 0.00 2A3 0.00 0.00 0.00 0.00 2A4 0.00 0.00 0.00 0.00 2A5 0.00 0.00 0.00 0.00 2A6 0.00 3225,~~344~~625,~~442~~467.3765 76,~~494~~829,~~227~~727.5347 0.00 2A7 0.00 83,685,000.00 284,529.0200 0.00 2A8 0.00 ~~893~~842,~~882~~119.3687 6055,~~183~~049.3674 0.00 2AIO 0.00 0.00 2,022.39 0.00 2AP 0.00 570,~~683~~025.0357 ~~3,481~~657.2246 0.00 B1 0.00 9,~~651~~327,~~064~~829.9017 ~~311~~356,~~696~~474.0320 0.00 B2 0.00 43,~~083~~946,~~305~~546.3230 ~~131~~150,~~876~~822.6501 0.00 B3 0.00 2,~~969~~870,~~753~~289.4072 95109,~~912~~691.7757 0.00 B4 0.00 1,~~484~~434,~~454~~736.2657 4754,~~942~~830.7418 0.00 B5 0.00 1,~~113~~076,~~551~~256.9257 3541,~~963~~130.8844 0.00 B6 0.00 1,~~485~~435,~~190~~447.1581 4754,~~966~~857.5137 0.00 WIO 0.00 0.00 ~~205~~194,~~495~~663.2763 0.00 SES 0.00 0.00 5954,~~046~~770.7011 0.00 Totals 0.00 ~~293~~273,~~197~~905,~~541~~863.8868 1820,~~456~~549,~~308~~943.6996 0.00 All distributions required by the Pooling and Servicing Agreement have been calculated by the Certificate Administrator on behalf of the Trustee.

Principal Distribution Statement Original Beginning Scheduled Unscheduled Face Certificate Principal Principal Realized Class Amount Balance Distribution Distribution Accretion Loss (1) 1A1 89,979,000.00 2928,~~178~~112,~~146~~616.5714 4746,~~480~~249.7875 14,~~018~~434,~~049~~940.6685 0.00 0.00 1AR 50.00 0.00 0.00 0.00 0.00 0.00 1AMR 25.00 0.00 0.00 0.00 0.00 0.00 1ALR 25.00 0.00 0.00 0.00 0.00 0.00 2A1 100,000,000.00 3331,~~948~~924,~~928~~370.7810 2120,~~023~~119.5180 21,~~003~~828,~~535~~540.1760 0.00 0.00 2A2 297,200,000.00 ~~100~~94,~~896~~879,~~216~~227.3593 6259,~~481~~796.8705 5,~~954~~434,~~506~~422.5466 0.00 0.00 2A3 91,762,000.00 0.00 0.00 0.00 0.00 0.00 2A4 74,999,000.00 0.00 0.00 0.00 0.00 0.00 2A5 59,039,000.00 0.00 0.00 0.00 0.00 0.00 2A6 53,966,000.00 3932,~~702~~344,~~721~~442.1537 7673,~~410~~125.1662 76,~~281~~645,~~868~~849.6309 0.00 0.00 2A7 83,685,000.00 83,685,000.00 0.00 0.00 0.00 0.00 2A8 2,800,000.00 ~~950~~893,~~570~~882.0136 ~~588~~563.6635 5651,~~098~~199.9814 0.00 0.00 2AIO 0.00 0.00 0.00 0.00 0.00 0.00 2AP 643,981.00 ~~574~~570,~~164~~683.2403 ~~624~~626.2266 ~~2,857~~30.0079 0.00 0.00 B1 11,423,000.00 9,~~928~~651,~~555~~064.8990 7,~~208~~130.5919 ~~270~~316,~~282~~105.4054 0.00 0.00 B2 4,833,000.00 4,~~200~~083,~~710~~305.0332 3,~~049~~016.9174 ~~114~~133,~~354~~742.8028 0.00 0.00 B3 3,515,000.00 32,~~055~~969,~~140~~753.8540 2,~~218~~194.1705 8397,~~169~~269.2863 0.00 0.00 B4 1,757,000.00 1,~~527~~484,~~135~~454.8426 1,~~108~~096.7771 4148,~~572~~620.8198 0.00 0.00 B5 1,318,000.00 1,~~145~~113,~~569~~551.1792 ~~831~~822.7469 3136,~~185~~472.5265 0.00 0.00 B6 1,757,871.00 1,~~527~~485,~~892~~190.8915 1,~~109~~097.3226 4148,~~593~~645.4208 0.00 0.00 WIO 0.00 0.00 0.00 0.00 0.00 0.00 SES 0.00 0.00 0.00 0.00 0.00 0.00 Totals 878,677,952.00 ~~310~~293,~~320~~197,~~751~~541.7788 ~~224~~215,~~135~~838.7087 1619,~~899~~075,~~074~~839.2129 0.00 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.

Principal Distribution Statement (continued) Total Ending Ending Total Principal Certificate Certificate Principal Class Reduction Balance Percentage Distribution 1A1 14,~~065~~481,~~530~~190.4460 2823,~~112~~631,~~616~~425.1453 0.~~31243530~~26263268 14,~~065~~481,~~530~~190.4460 1AR 0.00 0.00 0.00000000 0.00 1AMR 0.00 0.00 0.00000000 0.00 1ALR 0.00 0.00 0.00000000 0.00 2A1 21,~~024~~848,~~558~~660.6940 3130,~~924~~075,~~370~~709.1070 0.~~31924370~~30075710 21,~~024~~848,~~558~~660.6940 2A2 65,~~016~~494,~~988~~218.4171 9489,~~879~~385,~~227~~009.9322 0.~~31924370~~30075710 65,~~016~~494,~~988~~218.4171 2A3 0.00 0.00 0.00000000 0.00 2A4 0.00 0.00 0.00000000 0.00 2A5 0.00 0.00 0.00000000 0.00 2A6 76,~~358~~718,~~278~~974.7971 3225,~~344~~625,~~442~~467.3765 0.~~59934852~~47484467 76,~~358~~718,~~278~~974.7971 2A7 0.00 83,685,000.00 1.00000000 0.00 2A8 5651,~~687~~762.6449 ~~893~~842,~~882~~119.3687 0.~~31924370~~30075710 5651,~~687~~762.6449 2AIO 0.00 0.00 0.00000000 0.00 2AP ~~3,481~~657.2246 570,~~683~~025.0357 0.~~88617992~~88515899 ~~3,481~~657.2246 B1 ~~277~~323,~~490~~235.9973 9,~~651~~327,~~064~~829.9017 0.~~84488006~~81658314 ~~277~~323,~~490~~235.9973 B2 ~~117~~136,~~404~~759.7102 43,~~083~~946,~~305~~546.3230 0.~~84488006~~81658314 ~~117~~136,~~404~~759.7102 B3 8599,~~387~~463.4568 2,~~969~~870,~~753~~289.4072 0.~~84488006~~81658314 8599,~~387~~463.4568 B4 4249,~~681~~717.5869 1,~~484~~434,~~454~~736.2657 0.~~84488006~~81658314 4249,~~681~~717.5869 B5 3237,~~017~~295.2634 1,~~113~~076,~~551~~256.9257 0.~~84488006~~81658313 3237,~~017~~295.2634 B6 4249,~~702~~742.7434 1,~~485~~435,~~190~~447.1581 0.~~84488006~~81658313 4249,~~702~~742.7434 WIO 0.00 0.00 0.00000000 0.00 SES 0.00 0.00 0.00000000 0.00 Totals 1719,~~123~~291,~~209~~678.9217 ~~293~~273,~~197~~905,~~541~~863.8868 0.~~33368032~~31172498 1719,~~123~~291,~~209~~678.9217

Principal Distribution Factors Statement Original Beginning Scheduled Unscheduled Face Certificate Principal Principal Class (2) Amount Balance Distribution Distribution Accretion 1A1 89,979,000.00 ~~324~~312.~~27729326~~43530313 0.~~52768735~~51400605 1149.~~31430289~~28862123 0.00000000 1AR 50.00 0.00000000 0.00000000 0.00000000 0.00000000 1AMR 25.00 0.00000000 0.00000000 0.00000000 0.00000000 1ALR 25.00 0.00000000 0.00000000 0.00000000 0.00000000 2A1 100,000,000.00 ~~339~~319.~~48928780~~24370100 0.~~21023510~~20119800 2018.~~03535170~~28540600 0.00000000 2A2 297,200,000.00 ~~339~~319.~~48928785~~24370098 0.~~21023509~~20119801 2018.~~03535175~~28540599 0.00000000 2A3 91,762,000.00 0.00000000 0.00000000 0.00000000 0.00000000 2A4 74,999,000.00 0.00000000 0.00000000 0.00000000 0.00000000 2A5 59,039,000.00 0.00000000 0.00000000 0.00000000 0.00000000 2A6 53,966,000.00 ~~735~~599.~~69879461~~34852259 1.~~41589445~~35503132 ~~134~~123.~~93437776~~14881759 0.00000000 2A7 83,685,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 2A8 2,800,000.00 ~~339~~319.~~48928929~~24370000 0.~~21023571~~20119643 2018.~~03535000~~28540714 0.00000000 2AIO 0.00 0.00000000 0.00000000 0.00000000 0.00000000 2AP 643,981.00 ~~891~~886.~~58568343~~17991835 0.~~96931431~~97310324 40.~~43646629~~04781197 0.00000000 B1 11,423,000.00 ~~869~~844.~~17236190~~88005778 0.~~63105927~~62419592 2327.~~66124486~~67272520 0.00000000 B2 4,833,000.00 ~~869~~844.~~17236292~~88005794 0.~~63105938~~62419615 2327.~~66124560~~67272502 0.00000000 B3 3,515,000.00 ~~869~~844.~~17236131~~88005690 0.~~63105832~~62419630 2327.~~66124609~~67272546 0.00000000 B4 1,757,000.00 ~~869~~844.~~17236198~~88005692 0.~~63105862~~62419465 2327.~~66124644~~67272624 0.00000000 B5 1,318,000.00 ~~869~~844.~~17235964~~88006070 0.~~63106222~~62419575 2327.~~66124431~~67272382 0.00000000 B6 1,757,871.00 ~~869~~844.~~17236248~~88005661 0.~~63105882~~62419825 2327.~~66124704~~67272456 0.00000000 WIO 0.00 0.00000000 0.00000000 0.00000000 0.00000000 SES 0.00 0.00000000 0.00000000 0.00000000 0.00000000 (2) All classes are per $1000 denomination.

Principal Distribution Factors Statement (continued) Total Ending Ending Total Realized Principal Certificate Certificate Principal Class Loss (3) Reduction Balance Percentage Distribution 1A1 0.00000000 1149.~~84199024~~80262728 ~~312~~262.~~43530313~~63267574 0.~~31243530~~26263268 1149.~~84199024~~80262728 1AR 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1AMR 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1ALR 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 2A1 0.00000000 2018.~~24558690~~48660400 ~~319~~300.~~24370100~~75709700 0.~~31924370~~30075710 2018.~~24558690~~48660400 2A2 0.00000000 2018.~~24558684~~48660400 ~~319~~300.~~24370098~~75709697 0.~~31924370~~30075710 2018.~~24558684~~48660400 2A3 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 2A4 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 2A5 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 2A6 0.00000000 ~~136~~124.~~35027221~~50384890 ~~599~~474.~~34852259~~84467350 0.~~59934852~~47484467 ~~136~~124.~~35027221~~50384890 2A7 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 2A8 0.00000000 2018.~~24558571~~48660357 ~~319~~300.~~24370000~~75709643 0.~~31924370~~30075710 2018.~~24558571~~48660357 2AIO 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 2AP 0.00000000 51.~~40578061~~02093074 ~~886~~885.~~17991835~~15898761 0.~~88617992~~88515899 51.~~40578061~~02093074 B1 0.00000000 2428.~~29230412~~29692112 ~~844~~816.~~88005778~~58313665 0.~~84488006~~81658314 2428.~~29230412~~29692112 B2 0.00000000 2428.~~29230499~~29692117 ~~844~~816.~~88005794~~58313677 0.~~84488006~~81658314 2428.~~29230499~~29692117 B3 0.00000000 2428.~~29230441~~29692176 ~~844~~816.~~88005690~~58313514 0.~~84488006~~81658314 2428.~~29230441~~29692176 B4 0.00000000 2428.~~29230507~~29692089 ~~844~~816.~~88005692~~58313603 0.~~84488006~~81658314 2428.~~29230507~~29692089 B5 0.00000000 2428.~~29230653~~29691958 ~~844~~816.~~88006070~~58313354 0.~~84488006~~81658313 2428.~~29230653~~29691958 B6 0.00000000 2428.~~29230586~~29692281 ~~844~~816.~~88005661~~58313380 0.~~84488006~~81658313 2428.~~29230586~~29692281 WIO 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 SES 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 (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.

Interest Distribution Statement Beginning Payment of Original Current Certificate/ Current Unpaid Current Face Certificate Notional Accrued Interest Interest Class Amount Rate Balance Interest Shortfall Shortfall 1A1 89,979,000.00 3.00200% 2928,~~178~~112,~~146~~616.5714 7270,~~994~~328.0039 0.00 0.00 1AR 50.00 3.00200% 0.00 0.00 0.00 0.00 1AMR 25.00 3.00200% 0.00 0.00 0.00 0.00 1ALR 25.00 3.00200% 0.00 0.00 0.00 0.00 2A1 100,000,000.00 4.41300% 3331,~~948~~924,~~928~~370.7810 ~~124~~117,~~847~~401.1987 0.00 0.00 2A2 297,200,000.00 4.41300% ~~100~~94,~~896~~879,~~216~~227.3593 ~~371~~348,~~045~~918.8436 0.00 0.00 2A3 91,762,000.00 1.68500% 0.00 0.00 0.00 0.00 2A4 74,999,000.00 2.88700% 0.00 0.00 0.00 0.00 2A5 59,039,000.00 3.63600% 0.00 0.00 0.00 0.00 2A6 53,966,000.00 4.10900% 3932,~~702~~344,~~721~~442.1537 ~~135~~110,~~948~~752.7376 0.00 0.00 2A7 83,685,000.00 4.08000% 83,685,000.00 284,529.00 0.00 0.00 2A8 2,800,000.00 4.41300% ~~950~~893,~~570~~882.0136 3,~~495~~287.7225 0.00 0.00 2AIO 0.00 0.02900% 83,685,000.00 2,022.39 0.00 0.00 2AP 643,981.00 0.00000% ~~574~~570,~~164~~683.2403 0.00 0.00 0.00 B1 11,423,000.00 4.~~13414~~13283% 9,~~928~~651,~~555~~064.8990 3433,~~205~~238.0347 0.00 0.00 B2 4,833,000.00 4.~~13414~~13283% 4,~~200~~083,~~710~~305.0332 14,~~471~~062.9499 0.00 0.00 B3 3,515,000.00 4.~~13414~~13283% 32,~~055~~969,~~140~~753.8540 10,~~525~~227.3289 0.00 0.00 B4 1,757,000.00 4.~~13414~~13283% 1,~~527~~484,~~135~~454.8426 5,~~261~~112.1649 0.00 0.00 B5 1,318,000.00 4.~~13414~~13283% 1,~~145~~113,~~569~~551.1792 3,~~946~~835.6210 0.00 0.00 B6 1,757,871.00 4.~~13414~~13283% 1,~~527~~485,~~892~~190.8915 5,~~263~~115.7703 0.00 0.00 WIO 0.00 0.~~83493~~83784% ~~295~~278,~~348~~808,~~826~~627.1531 ~~205~~194,~~495~~663.2763 0.00 0.00 SES 0.00 0.00000% ~~310~~293,~~320~~197,~~752~~542.2938 0.00 0.00 0.00 Totals 878,677,952.00 1,~~274~~203,~~051~~495.9862 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 1A1 (0.~~01)~~00 0.00 7270,~~994~~328.0040 0.00 2823,~~112~~631,~~616~~425.1453 1AR 0.00 0.00 0.00 0.00 0.00 1AMR 0.00 0.00 0.00 0.00 0.00 1ALR 0.00 0.00 0.0304 0.00 0.00 2A1 (0.~~01)~~00 0.00 ~~124~~117,~~847~~401.1987 0.00 3130,~~924~~075,~~370~~709.1070 2A2 (0.0201) 0.00 ~~371~~348,~~045~~918.8637 0.00 9489,~~879~~385,~~227~~009.9322 2A3 0.00 0.00 0.00 0.00 0.00 2A4 0.00 0.00 0.00 0.00 0.00 2A5 0.00 0.00 0.00 0.00 0.00 2A6 (0.~~01)~~00 0.00 ~~135~~110,~~948~~752.7476 0.00 3225,~~344~~625,~~442~~467.3765 2A7 (0.~~02)~~00 0.00 284,529.0200 0.00 83,685,000.00 2A8 0.00 0.00 3,~~495~~287.7225 0.00 ~~893~~842,~~882~~119.3687 2AIO 0.00 0.00 2,022.39 0.00 83,685,000.00 2AP 0.00 0.00 0.00 0.00 570,~~683~~025.0357 B1 0.00 0.00 3433,~~205~~238.0447 0.00 9,~~651~~327,~~064~~829.9017 B2 0.00 0.00 14,~~471~~062.9499 0.00 43,~~083~~946,~~305~~546.3230 B3 0.00 0.00 10,~~525~~227.3289 0.00 2,~~969~~870,~~753~~289.4072 B4 0.00 0.00 5,~~261~~112.1649 0.00 1,~~484~~434,~~454~~736.2657 B5 0.00 0.00 3,~~946~~835.6210 0.00 1,~~113~~076,~~551~~256.9257 B6 0.00 0.00 5,~~263~~115.7703 0.00 1,~~485~~435,~~190~~447.1581 WIO 0.00 0.00 ~~205~~194,~~495~~663.2763 0.00 ~~278~~259,~~808~~529,~~627~~590.3196 SES 0.00 0.00 5954,~~046~~770.7011 0.00 ~~293~~273,~~197~~905,~~542~~864.3821 Totals (0.0701) 0.00 1,~~333~~258,~~098~~265.7779 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.

Interest Distribution Factors Statement Beginning Payment of Original Current Certificate/ Current Unpaid Current Face Certificate Notional Accrued Interest Interest Class (5) Amount Rate Balance Interest Shortfall Shortfall 1A1 89,979,000.00 3.00200% ~~324~~312.~~27729326~~43530313 0.~~81123373~~78160893 0.00000000 0.00000000 1AR 50.00 3.00200% 0.00000000 0.00000000 0.00000000 0.00000000 1AMR 25.00 3.00200% 0.00000000 0.00000000 0.00000000 0.00000000 1ALR 25.00 3.00200% 0.00000000 0.00000000 0.00000000 0.00000000 2A1 100,000,000.00 4.41300% ~~339~~319.~~48928780~~24370100 1.~~24847190~~17401870 0.00000000 0.00000000 2A2 297,200,000.00 4.41300% ~~339~~319.~~48928785~~24370098 1.~~24847187~~17401871 0.00000000 0.00000000 2A3 91,762,000.00 1.68500% 0.00000000 0.00000000 0.00000000 0.00000000 2A4 74,999,000.00 2.88700% 0.00000000 0.00000000 0.00000000 0.00000000 2A5 59,039,000.00 3.63600% 0.00000000 0.00000000 0.00000000 0.00000000 2A6 53,966,000.00 4.10900% ~~735~~599.~~69879461~~34852259 2.~~51915521~~05226921 0.00000000 0.00000000 2A7 83,685,000.00 4.08000% 1000.00000000 3.40000000 0.00000000 0.00000000 2A8 2,800,000.00 4.41300% ~~339~~319.~~48928929~~24370000 1.~~24847143~~17401786 0.00000000 0.00000000 2AIO 0.00 0.02900% 270.40082718 0.00653469 0.00000000 0.00000000 2AP 643,981.00 0.00000% ~~891~~886.~~58568343~~17991835 0.00000000 0.00000000 0.00000000 B1 11,423,000.00 4.~~13414~~13283% ~~869~~844.~~17236190~~88005778 2.~~99439989~~90978465 0.00000000 0.00000000 B2 4,833,000.00 4.~~13414~~13283% ~~869~~844.~~17236292~~88005794 2.~~99440099~~90978481 0.00000000 0.00000000 B3 3,515,000.00 4.~~13414~~13283% ~~869~~844.~~17236131~~88005690 2.~~99440114~~90978378 0.00000000 0.00000000 B4 1,757,000.00 4.~~13414~~13283% ~~869~~844.~~17236198~~88005692 2.~~99439954~~90978372 0.00000000 0.00000000 B5 1,318,000.00 4.~~13414~~13283% ~~869~~844.~~17235964~~88006070 2.~~99440061~~90978756 0.00000000 0.00000000 B6 1,757,871.00 4.~~13414~~13283% ~~869~~844.~~17236248~~88005661 2.~~99440061~~90978690 0.00000000 0.00000000 WIO 0.00 0.~~83493~~83784% ~~343~~324.~~48654740~~25052785 0.~~23898812~~22639107 0.00000000 0.00000000 SES 0.00 0.00000% ~~353~~333.~~16779252~~68032286 0.00000000 0.00000000 0.00000000 (5) All classes are per $1000 denomination.

Interest Distribution Factors Statement (continued) Remaining Ending Non-Supported Total Unpaid Certificate/ Interest Realized Interest Interest Notional Class Shortfall Losses (6) Distribution Shortfall Balance 1A1 (0.~~00000011)~~00000000 0.00000000 0.~~81123373~~78160904 0.00000000 ~~312~~262.~~43530313~~63267574 1AR 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1AMR 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 1ALR 0.00000000 0.00000000 1.~~20000000~~60000000 0.00000000 0.00000000 2A1 (0.~~00000010)~~00000000 0.00000000 1.~~24847190~~17401870 0.00000000 ~~319~~300.~~24370100~~75709700 2A2 (0.~~00000007~~00000003) 0.00000000 1.~~24847194~~17401874 0.00000000 ~~319~~300.~~24370098~~75709697 2A3 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 2A4 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 2A5 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 2A6 (0.~~00000019)~~00000000 0.00000000 2.~~51915539~~05226921 0.00000000 ~~599~~474.~~34852259~~84467350 2A7 (0.~~00000024)~~00000000 0.00000000 3.~~40000024~~40000000 0.00000000 1000.00000000 2A8 0.00000000 0.00000000 1.~~24847143~~17401786 0.00000000 ~~319~~300.~~24370000~~75709643 2AIO 0.00000000 0.00000000 0.00653469 0.00000000 270.40082718 2AP 0.00000000 0.00000000 0.00000000 0.00000000 ~~886~~885.~~17991835~~15898761 B1 0.00000000 0.00000000 2.~~99440077~~90978465 0.00000000 ~~844~~816.~~88005778~~58313665 B2 0.00000000 0.00000000 2.~~99440099~~90978481 0.00000000 ~~844~~816.~~88005794~~58313677 B3 0.00000000 0.00000000 2.~~99440114~~90978378 0.00000000 ~~844~~816.~~88005690~~58313514 B4 0.00000000 0.00000000 2.~~99439954~~90978372 0.00000000 ~~844~~816.~~88005692~~58313603 B5 0.00000000 0.00000000 2.~~99440061~~90978756 0.00000000 ~~844~~816.~~88006070~~58313354 B6 0.00000000 0.00000000 2.~~99440061~~90978690 0.00000000 ~~844~~816.~~88005661~~58313380 WIO 0.00000000 0.00000000 0.~~23898812~~22639107 0.00000000 ~~324~~301.~~25052785~~82927865 SES 0.00000000 0.00000000 0.~~06719948~~06233241 0.00000000 ~~333~~311.~~68032286~~72497716 (6) 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 Component Statement Component Beginning Ending Beginning Ending Ending Pass-Through Notional Notional Component Component Component Class Rate Balance Balance Balance Balance Percentage WIO-1 1.~~40298~~40560% ~~31,443,465.28~~ 30,336,205.90 25,682,637.07 0.00 0.00 3227.~~77063335~~74362376% WIO-2 0.~~76724~~76852% ~~263,905,360.87~~ 248,472,421.41 233,846,953.89 0.00 0.00 3230.~~38335918~~47722503% SES-1 0.00000% ~~31,443,465.28~~ 30,336,205.90 25,682,637.07 0.00 0.00 3227.~~77063335~~74362376% SES-2 0.00000% ~~278,877,287.01~~ 262,861,336.48 248,223,227.14 0.00 0.00 3331.~~43838153~~57627928%

CERTIFICATEHOLDER ACCOUNT STATEMENT CERTIFICATE ACCOUNT Beginning Balance 0.00 Deposits Payments of Interest and Principal 1820,~~470~~562,~~014~~893.5152 Liquidations, Insurance Proceeds, Reserve Funds 0.00 Proceeds from Repurchased Loans 0.00 Other Amounts (Servicer Advances) 0.00 Realized Loss (Gains, Subsequent Expenses & Recoveries) 0.00 Prepayment Penalties 0.00 Total Deposits 1820,~~470~~562,~~014~~893.5152 Withdrawals Reimbursement for Servicer Advances 0.00 Payment of Service Fee 1312,~~705~~949.8256 Payment of Interest and Principal 1820,~~456~~549,~~308~~943.6996 Total Withdrawals (Pool Distribution Amount) 1820,~~470~~562,~~014~~893.5152 Ending Balance 0.00

SERVICING FEES Gross Servicing Fee 12,~~930~~216.0357 Wells Fargo Trustee Fee ~~775~~732.7999 Supported Prepayment/Curtailment Interest Shortfall 0.00 Net Servicing Fee 1312,~~705~~949.8256

LOAN 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 1 0 1 0.00 344,~~719~~316.1676 0.00 344,~~719~~316.1676 30 Days 12 0 0 0 12 ~~357~~961,~~430~~636.1613 0.00 0.00 0.00 ~~357~~961,~~430~~636.1613 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 12 0 1 0 23 ~~357~~961,~~430~~636.1613 0.00 344,~~719~~316.1676 0.00 ~~702~~1,~~149~~305,952.3289 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.~~172117~~182815% 0.000000% 0.~~172117~~182815% 0.000000% 0.~~117501~~125627% 0.000000% 0.~~117501~~125627% 30 Days 0.~~172117~~365631% 0.000000% 0.000000% 0.000000% 0.~~172117~~365631% 0.~~121833~~350862% 0.000000% 0.000000% 0.000000% 0.~~121833~~350862% 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.~~172117~~365631% 0.000000% 0.~~172117~~182815% 0.000000% 0.~~344234~~548446% 0.~~121833~~350862% 0.000000% 0.~~117501~~125627% 0.000000% 0.~~239334~~476490%

Delinquency Status By Groups 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 1 0 0 0 1 ~~357~~356,~~430~~940.1697 0.00 0.00 0.00 ~~357~~356,~~430~~940.1697 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 ~~357~~356,~~430~~940.1697 0.00 0.00 0.00 ~~357~~356,~~430~~940.1697 0-29 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 30 Days 1.~~666667~~923077% 0.000000% 0.000000% 0.000000% 1.~~666667~~923077% 1.~~176464~~387775% 0.000000% 0.000000% 0.000000% 1.~~176464~~387775% 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.~~666667~~923077% 0.000000% 0.000000% 0.000000% 1.~~666667~~923077% 1.~~176464~~387775% 0.000000% 0.000000% 0.000000% 1.~~176464~~387775% 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 1 0 1 0.00 344,~~719~~316.1676 0.00 344,~~719~~316.1676 30 Days 01 0 0 0 01 0604,695.0016 0.00 0.00 0.00 0604,695.0016 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 01 0 1 0 12 0604,695.0016 0.00 344,~~719~~316.1676 0.00 ~~344~~949,~~719~~011.1692 0-29 Days 0.000000% 0.~~191939~~202020% 0.000000% 0.~~191939~~202020% 0.000000% 0.~~131074~~138638% 0.000000% 0.~~131074~~138638% 30 Days 0.~~000000~~202020% 0.000000% 0.000000% 0.000000% 0.~~000000~~202020% 0.~~000000~~243478% 0.000000% 0.000000% 0.000000% 0.~~000000~~243478% 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~~202020% 0.000000% 0.~~191939~~202020% 0.000000% 0.~~191939~~404040% 0.~~000000~~243478% 0.000000% 0.~~131074~~138638% 0.000000% 0.~~131074~~382115%

COLLATERAL STATEMENT Collateral Description Mixed ARM Weighted Average Gross Coupon 5.~~192382~~191604% Weighted Average Pass-Through Rate 4.~~926717~~925670% Weighted Average Maturity(Stepdown Calculation ) ~~339~~338 Beginning Scheduled Collateral Loan Count ~~614~~581 Number Of Loans Paid In Full 3334 Ending Scheduled Collateral Loan Count ~~581~~547 Beginning Scheduled Collateral Balance ~~310~~293,~~320~~197,~~752~~542.2938 Ending Scheduled Collateral Balance ~~293~~273,~~197~~905,~~542~~864.3821 Ending Actual Collateral Balance at 31-~~Jul~~Aug-2004 ~~293~~274,~~376~~077,~~718~~838.3820 Monthly P &I Constant 1,~~566~~484,~~889~~310.0338 Special Servicing Fee 0.00 Prepayment Penalties 0.00 Realized Loss Amount 0.00 Cumulative Realized Loss 0.00 Class A Optimal Amount 1719,~~722~~726,~~422~~710.1056 Class AP Deferred Amount 0.00 Ending Scheduled Balance for Premium Loans ~~293~~273,~~197~~905,~~542~~864.3821 Scheduled Principal ~~224~~215,~~135~~838.7188 Unscheduled Principal 1619,~~899~~075,~~074~~839.2029

Miscellaneous Reporting Total Senior % 9392.~~095970~~896305% Aggregate Subordinate % 67.~~904032~~103695%

Group Level Collateral Statement Group 1 2 Total Collateral Description Mixed ARM Mixed ARM Mixed ARM Weighted Average Coupon Rate 4.~~782978~~785600 5.~~238543~~238461 5.~~192382~~191604 Weighted Average Net Rate 4.~~532978~~535599 4.~~988543~~988461 4.~~942382~~928671 Weighted Average Maturity ~~336~~335 ~~340~~ 339 338 Beginning Loan Count 6360 ~~551~~521 ~~614~~581 Loans Paid In Full 38 3026 3334 Ending Loan Count 6052 ~~521~~495 ~~581~~547 Beginning Scheduled Balance 3130,~~443~~336,~~465~~205.2890 ~~278~~262,~~877~~861,~~287~~336.0148 ~~310~~293,~~320~~197,~~752~~542.2938 Ending scheduled Balance 3025,~~336~~682,~~205~~637.9007 ~~262~~248,~~861~~223,~~336~~227.4814 ~~293~~273,~~197~~905,~~542~~864.3821 Record Date 0708/31/2004 0708/31/2004 0708/31/2004 Principal And Interest Constant ~~176~~170,~~494~~888.9070 1,~~390~~313,~~394~~421.1368 1,~~566~~484,~~889~~310.0338 Scheduled Principal 5149,~~167~~907.0791 ~~172~~165,~~968~~930.6497 ~~224~~215,~~135~~838.7188 Unscheduled Principal 14,~~056~~603,~~092~~660.3192 1514,~~842~~472,~~981~~178.8937 1619,~~899~~075,~~074~~839.2029 Scheduled Interest ~~125~~120,~~327~~980.8379 1,~~217~~147,~~425~~490.4971 1,~~342~~268,~~753~~471.3250 Servicing Fees 6,~~550~~320.7106 5854,~~099~~762.4577 6461,~~650~~082.1683 Master Servicing Fees 0.00 0.00 0.00 Trustee Fee 7875.6282 ~~697~~657.17 ~~775~~732.7999 FRY Amount 0.00 0.00 0.00 Special Hazard Fee 0.00 0.00 0.00 Other Fee 3,~~275~~160.3400 0.00 3,~~275~~160.3400 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 ~~115~~111,~~423~~424.1691 1,~~158~~092,~~628~~070.8777 1,~~274~~203,~~052~~495.0368 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 Pass-Through Rate 4.~~404978~~407600 4.~~985543~~985461 4.~~926717~~925670

Miscellaneous Reporting Group 1 CPR 3386.~~677968~~173219% Subordinate % 7.~~204418~~329822% Subordinate Prepayment % 3.~~602209~~664911% Senior Prepayment % 96.~~397791~~335089% Senior % 92.~~795582~~670178% Group 2 CPR 5049.~~455418~~338355% Subordinate % 67.~~870092~~077541% Subordinate Prepayment % 3.~~435046~~538771% Senior Prepayment % 96.~~564954~~461229% Senior % 9392.~~129908~~922459%

Filing Compare · BANC OF AMERICA MORT SEC INC MORT PASS THR CERT SER 2003-B