8-K 1 sai03bc4_dec.txt DECEMBER 8K 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): December 26, 2003 STRUCTURED ASSET INVESTMENT LOAN TRUST Mortgage Pass-Through Certificates, Series 2003-BC4 Trust (Exact name of registrant as specified in its charter) New York (governing law of 333-102489-10 Pooling and Servicing Agreement) (Commission 54-2114688 (State or other File Number) 54-2114689 jurisdiction 54-2114690 of Incorporation) IRS EIN c/o Wells Fargo Bank Minnesota, 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) ITEM 5. Other Events On December 26, 2003 a distribution was made to holders of STRUCTURED ASSET INVESTMENT LOAN TRUST, Mortgage Pass-Through Certificates, Series 2003-BC4 Trust. ITEM 7. Financial Statements and Exhibits (c) Exhibits furnished in accordance with Item 601(a) of Regulation S-K Exhibit Number Description EX-99.1 Monthly report distributed to holders of Mortgage Pass-Through Certificates, Series 2003-BC4 Trust, relating to the December 26, 2003 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. STRUCTURED ASSET INVESTMENT LOAN TRUST Mortgage Pass-Through Certificates, Series 2003-BC4 Trust By: Wells Fargo Bank Minnesota, N.A. as Trustee By: /s/ Beth Belfield as Assistant Vice President By: Beth Belfield as Assistant Vice President Date: 1/7/04 INDEX TO EXHIBITS Exhibit Number Description EX-99.1 Monthly report distributed to holders of Mortgage Pass-Through Certificates, Series 2003-BC4 Trust, relating to the December 26, 2003 distribution. EX-99.1

Structured Asset Investment Loan Trust Mortgage Pass-Through Certificates Record Date: 1011/3130/03 Distribution Date: 1112/2526/03 SAIL Series: 2003-BC4 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 86358EBF2 SEN 1.~~24000~~23875% ~~216~~201,~~749~~921,~~046~~110.1003 ~~216~~215,~~508~~389.2153 1410,~~827~~887,~~936~~665.0842 1-A2 86358EBG0 SEN 1.93000% 183,309,000.00 294,821.97 0.00 2-A1 86358EBH8 SEN 1.~~24000~~23875% ~~127~~119,~~662~~079,~~571~~873.6941 127,~~520~~022.7266 85,~~582~~060,~~698~~110.2783 2-A2 86358EBJ4 SEN 1.91000% 118,993,000.00 189,397.19 0.00 A-IO 86358EBK1 IO 6.00000% 0.00 1,~~359~~112,~~679~~464.98 0.00 M1 86358EBL9 MEZ 1.~~92000~~91875% 35,434,000.00 5458,~~804~~546.5907 0.00 M2 86358EBM7 MEZ 3.~~12000~~11875% 37,082,000.00 9399,~~199~~587.4306 0.00 M3 86358EBN5 MEZ 3.~~37000~~36875% 10,301,000.00 2729,~~964~~881.3584 0.00 M4 86358EBP0 MEZ 4.~~37000~~36875% 12,361,000.00 4346,~~514~~501.1582 0.00 M5 86358EBQ8 MEZ 4.~~62000~~61875% 7,004,000.00 2627,~~066~~856.5571 0.00 B 86358EBR6 SEN 4.~~62000~~61875% 7,416,000.00 2729,~~599~~495.8834 0.00 X SAI03BC4X SEN 0.00000% 5,769,270.40 1,~~722~~868,~~719~~034.8101 0.00 P SAI03BC4P SEN 0.00000% 100.00 ~~305~~234,~~044~~991.1444 0.00 R SAI03B4R3 SEN 0.00000% 0.00 0.00 0.00 Totals ~~762~~738,~~080~~670,~~988~~353.1984 4,~~488~~333,~~840~~990.9762 2315,~~410~~947,~~634~~776.3525

Certificateholder Distribution Summary (continued) Current Ending Cumulative Realized Certificate Total Realized Class Loss Balance Distribution Losses 1-A1 0.00 ~~201~~191,~~921~~033,~~110~~444.0361 1511,~~044~~103,~~444~~054.2995 0.00 1-A2 0.00 183,309,000.00 294,821.97 0.00 2-A1 0.00 ~~119~~114,~~079~~019,~~873~~762.4158 85,~~710~~187,~~218~~133.9949 0.00 2-A2 0.00 118,993,000.00 189,397.19 0.00 A-IO 0.00 0.00 1,~~359~~112,~~679~~464.98 0.00 M1 0.00 35,434,000.00 5458,~~804~~546.5907 0.00 M2 0.00 37,082,000.00 9399,~~199~~587.4306 0.00 M3 0.00 10,301,000.00 2729,~~964~~881.3584 0.00 M4 0.00 12,361,000.00 4346,~~514~~501.1582 0.00 M5 0.00 7,004,000.00 2627,~~066~~856.5571 0.00 B 0.00 7,416,000.00 2729,~~599~~495.8834 0.00 X 0.00 5,769,270.40 1,~~722~~868,~~719~~034.8101 0.00 P 0.00 100.00 ~~305~~234,~~044~~991.1444 0.00 R 0.00 0.00 0.00 0.00 Totals 0.00 ~~738~~722,~~670~~722,~~353~~577.8459 2720,~~899~~281,~~475~~766.3287 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) 1-A1 246,749,000.00 ~~216~~201,~~749~~921,~~046~~110.1003 0.00 1410,~~827~~887,~~936~~665.0842 0.00 0.00 1-A2 183,309,000.00 183,309,000.00 0.00 0.00 0.00 0.00 2-A1 159,631,000.00 ~~127~~119,~~662~~079,~~571~~873.6941 0.00 85,~~582~~060,~~698~~110.2783 0.00 0.00 2-A2 118,993,000.00 118,993,000.00 0.00 0.00 0.00 0.00 A-IO 0.00 0.00 0.00 0.00 0.00 0.00 M1 35,434,000.00 35,434,000.00 0.00 0.00 0.00 0.00 M2 37,082,000.00 37,082,000.00 0.00 0.00 0.00 0.00 M3 10,301,000.00 10,301,000.00 0.00 0.00 0.00 0.00 M4 12,361,000.00 12,361,000.00 0.00 0.00 0.00 0.00 M5 7,004,000.00 7,004,000.00 0.00 0.00 0.00 0.00 B 7,416,000.00 7,416,000.00 0.00 0.00 0.00 0.00 X 5,769,270.40 5,769,270.40 0.00 0.00 0.00 0.00 P 100.00 100.00 0.00 0.00 0.00 0.00 R 0.00 0.00 0.00 0.00 0.00 0.00 Totals 824,049,370.40 ~~762~~738,~~080~~670,~~988~~353.1984 0.00 2315,~~410~~947,~~634~~776.3525 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 1-A1 1410,~~827~~887,~~936~~665.0842 ~~201~~191,~~921~~033,~~110~~444.0361 0.~~81832595~~77420149 1410,~~827~~887,~~936~~665.0842 1-A2 0.00 183,309,000.00 1.00000000 0.00 2-A1 85,~~582~~060,~~698~~110.2783 ~~119~~114,~~079~~019,~~873~~762.4158 0.~~74596960~~71427080 85,~~582~~060,~~698~~110.2783 2-A2 0.00 118,993,000.00 1.00000000 0.00 A-IO 0.00 0.00 0.00000000 0.00 M1 0.00 35,434,000.00 1.00000000 0.00 M2 0.00 37,082,000.00 1.00000000 0.00 M3 0.00 10,301,000.00 1.00000000 0.00 M4 0.00 12,361,000.00 1.00000000 0.00 M5 0.00 7,004,000.00 1.00000000 0.00 B 0.00 7,416,000.00 1.00000000 0.00 X 0.00 5,769,270.40 1.00000000 0.00 P 0.00 100.00 1.00000000 0.00 R 0.00 0.00 0.00000000 0.00 Totals 2315,~~410~~947,~~634~~776.3525 ~~738~~722,~~670~~722,~~353~~577.8459 0.~~89639090~~87703796 2315,~~410~~947,~~634~~776.3525

Principal Distribution Factors Statement Original Beginning Scheduled Unscheduled Face Certificate Principal Principal Class (2) Amount Balance Distribution Distribution Accretion 1-A1 246,749,000.00 ~~878~~818.~~41914699~~32595078 0.00000000 6044.~~09319624~~12445611 0.00000000 1-A2 183,309,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 2-A1 159,631,000.00 ~~799~~745.~~73546297~~96960121 0.00000000 5331.~~76586171~~69879804 0.00000000 2-A2 118,993,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 A-IO 0.00 0.00000000 0.00000000 0.00000000 0.00000000 M1 35,434,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 M2 37,082,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 M3 10,301,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 M4 12,361,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 M5 7,004,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 B 7,416,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 X 5,769,270.40 1000.00000000 0.00000000 0.00000000 0.00000000 P 100.00 1000.00000000 0.00000000 0.00000000 0.00000000 R 0.00 0.00000000 0.00000000 0.00000000 0.00000000 (2) All Classes are Per 1,000 Denomination

Principal Distribution Factors Statement (continued) Total Ending Ending Total Realized Principal Certificate Certificate Principal Class Loss (3) Reduction Balance Percentage Distribution 1-A1 0.00000000 6044.~~09319624~~12445611 ~~818~~774.~~32595078~~20149468 0.~~81832595~~77420149 6044.~~09319624~~12445611 1-A2 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 2-A1 0.00000000 5331.~~76586171~~69879804 ~~745~~714.~~96960121~~27080316 0.~~74596960~~71427080 5331.~~76586171~~69879804 2-A2 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 A-IO 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 M1 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 M2 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 M3 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 M4 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 M5 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 B 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 X 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 P 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 R 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 1-A1 246,749,000.00 1.~~24000~~23875% ~~216~~201,~~749~~921,~~046~~110.1003 ~~216~~215,~~508~~389.2153 0.00 0.00 1-A2 183,309,000.00 1.93000% 183,309,000.00 294,821.98 0.00 0.00 2-A1 159,631,000.00 1.~~24000~~23875% ~~127~~119,~~662~~079,~~571~~873.6941 127,~~520~~022.7267 0.00 0.00 2-A2 118,993,000.00 1.91000% 118,993,000.00 189,397.19 0.00 0.00 A-IO 0.00 6.00000% ~~271~~222,~~936~~493,000.00 1,~~359~~112,~~680~~465.00 0.00 0.00 M1 35,434,000.00 1.~~92000~~91875% 35,434,000.00 5458,~~804~~546.5907 0.00 0.00 M2 37,082,000.00 3.~~12000~~11875% 37,082,000.00 9399,~~199~~587.4306 0.00 0.00 M3 10,301,000.00 3.~~37000~~36875% 10,301,000.00 2729,~~964~~881.3584 0.00 0.00 M4 12,361,000.00 4.~~37000~~36875% 12,361,000.00 4346,~~514~~501.1582 0.00 0.00 M5 7,004,000.00 4.~~62000~~61875% 7,004,000.00 2627,~~066~~856.5571 0.00 0.00 B 7,416,000.00 4.~~62000~~61875% 7,416,000.00 2729,~~599~~495.8834 0.00 0.00 X 5,769,270.40 0.00000% 5,769,270.40 0.00 0.00 0.00 P 100.00 0.00000% 100.00 0.00 0.00 0.00 R 0.00 0.00000% 0.00 0.00 0.00 0.00 Totals 824,049,370.40 2,~~461~~230,~~077~~965.0521 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-A1 0.00 0.00 ~~216~~215,~~508~~389.2153 0.00 ~~201~~191,~~921~~033,~~110~~444.0361 1-A2 0.00 0.00 294,821.97 0.00 183,309,000.00 2-A1 0.00 0.00 127,~~520~~022.7266 0.00 ~~119~~114,~~079~~019,~~873~~762.4158 2-A2 0.00 0.00 189,397.19 0.00 118,993,000.00 A-IO 0.00 0.00 1,~~359~~112,~~679~~464.98 0.00 222,493,000.00 M1 0.00 0.00 5458,~~804~~546.5907 0.00 35,434,000.00 M2 0.00 0.00 9399,~~199~~587.4306 0.00 37,082,000.00 M3 0.00 0.00 2729,~~964~~881.3584 0.00 10,301,000.00 M4 0.00 0.00 4346,~~514~~501.1582 0.00 12,361,000.00 M5 0.00 0.00 2627,~~066~~856.5571 0.00 7,004,000.00 B 0.00 0.00 2729,~~599~~495.8834 0.00 7,416,000.00 X 0.00 0.00 1,~~722~~868,~~719~~034.8101 0.00 5,769,270.40 P 0.00 0.00 ~~305~~234,~~044~~991.1444 0.00 100.00 R 0.00 0.00 0.00 0.00 0.00 Totals 0.00 0.00 4,~~488~~333,~~840~~990.9762 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 1-A1 246,749,000.00 1.~~24000~~23875% ~~878~~818.~~41914699~~32595078 0.~~87744311~~87290943 0.00000000 0.00000000 1-A2 183,309,000.00 1.93000% 1000.00000000 1.60833336 0.00000000 0.00000000 2-A1 159,631,000.00 1.~~24000~~23875% ~~799~~745.~~73546297~~96960121 0.~~79884684~~79572683 0.00000000 0.00000000 2-A2 118,993,000.00 1.91000% 1000.00000000 1.59166665 0.00000000 0.00000000 A-IO 0.00 6.00000% ~~1000~~818.~~00000000~~18148388 54.~~00000000~~09090742 0.00000000 0.00000000 M1 35,434,000.00 1.~~92000~~91875% 1000.00000000 1.~~54666676~~65225687 0.00000000 0.00000000 M2 37,082,000.00 3.~~12000~~11875% 1000.00000000 2.~~51333342~~68559031 0.00000000 0.00000000 M3 10,301,000.00 3.~~37000~~36875% 1000.00000000 2.~~71472187~~90086788 0.00000000 0.00000000 M4 12,361,000.00 4.~~37000~~36875% 1000.00000000 3.~~52027749~~76197880 0.00000000 0.00000000 M5 7,004,000.00 4.~~62000~~61875% 1000.00000000 3.~~72166619~~97725728 0.00000000 0.00000000 B 7,416,000.00 4.~~62000~~61875% 1000.00000000 3.~~72166667~~97725728 0.00000000 0.00000000 X 5,769,270.40 0.00000% 1000.00000000 0.00000000 0.00000000 0.00000000 P 100.00 0.00000% 1000.00000000 0.00000000 0.00000000 0.00000000 R 0.00 0.00000% 0.00000000 0.00000000 0.00000000 0.00000000 (5) All Classes are per $1,000 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 1-A1 0.00000000 0.00000000 0.~~87744311~~87290943 0.00000000 ~~818~~774.~~32595078~~20149468 1-A2 0.00000000 0.00000000 1.60833331 0.00000000 1000.00000000 2-A1 0.00000000 0.00000000 0.~~79884684~~79572677 0.00000000 ~~745~~714.~~96960121~~27080316 2-A2 0.00000000 0.00000000 1.59166665 0.00000000 1000.00000000 A-IO 0.00000000 0.00000000 4.~~99999993~~09090735 0.00000000 818.18148388 M1 0.00000000 0.00000000 1.~~54666676~~65225687 0.00000000 1000.00000000 M2 0.00000000 0.00000000 2.~~51333342~~68559031 0.00000000 1000.00000000 M3 0.00000000 0.00000000 2.~~71472187~~90086788 0.00000000 1000.00000000 M4 0.00000000 0.00000000 3.~~52027749~~76197880 0.00000000 1000.00000000 M5 0.00000000 0.00000000 3.~~72166619~~97725728 0.00000000 1000.00000000 B 0.00000000 0.00000000 3.~~72166667~~97725728 0.00000000 1000.00000000 X 0.00000000 0.00000000 ~~298~~323.~~60271587~~79033751 0.00000000 1000.00000000 P 0.00000000 0.00000000 ~~3050441~~2349914.40000000 0.00000000 1000.00000000 R 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 (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 ACCOUNT STATEMENT CERTIFICATE ACCOUNT Beginning Balance 0.00 Deposits Payments of Interest and Principal 2821,~~707~~018,~~106~~030.5085 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) ~~(48,359~~0.~~67)~~00 Prepayment Penalties 0.00 Total Deposits 2821,~~658~~018,~~746~~030.8385 Withdrawals Reimbursement for Servicer Advances 0.00 Payment of Service Fee ~~759~~736,~~271~~263.5198 Payment of Interest and Principal 2720,~~899~~281,~~475~~766.3287 Total Withdrawals (Pool Distribution Amount) 2821,~~658~~018,~~746~~030.8385 Ending Balance 0.00

SERVICING FEES Gross Servicing Fee ~~317~~307,~~533~~779.5511 Credit Risk Manager's Fee 9,~~526~~233.0138 PMI Insurance Premium Fee ~~429~~417,~~989~~097.4424 Wells Fargo Bank Minnesota, NA 2,~~222~~154.5125 Supported Prepayment/Curtailment Interest Shortfall 0.00 Net Servicing Fee ~~759~~736,~~271~~263.5198

OTHER ACCOUNTS Beginning Current Current Ending Account Type Balance Withdrawals Deposits Balance Reserve Fund 1,000.00 ~~2,643~~0.7246 ~~2,643~~0.7246 1,000.00 Financial Guaranty 0.00 0.00 0.00 0.00

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 109 0 0 109 1,~~283~~300,~~377~~345.4929 0.00 0.00 1,~~283~~300,~~377~~345.4929 30 Days 95109 2 0 0 97111 1614,~~353~~186,~~235~~730.9796 ~~115~~338,~~456~~956.4340 0.00 0.00 1614,~~468~~525,~~692~~687.4036 60 Days 2551 3 305 0 5859 38,~~454~~605,~~840~~187.9796 ~~184~~258,~~460~~144.7664 5799,~~288,150~~285.2831 0.00 89,~~927~~662,~~452~~617.0191 90 Days 135 13 1729 0 3137 1850,~~856,881~~611.9845 ~~203~~331,~~698~~305.6104 24,~~633~~690,~~018~~256.6380 0.00 45,~~693~~872,~~599~~173.2229 120 Days 75 12 1419 0 2226 ~~775~~419,~~686~~139.2989 ~~103~~253,~~465~~569.6758 12,~~997~~900,~~958~~666.7976 0.00 23,~~877~~573,~~110~~376.7523 150 Days 3 2 1 13 10 1718 72377,~~738~~205.2497 42211,~~266~~035.5919 21,~~762~~780,~~990~~824.1581 ~~232,606~~0.0100 32,~~110~~369,~~600~~065.9997 180+ Days 5 3 229 21 5 3142 ~~428~~501,~~966~~704.2953 ~~140~~190,~~755~~832.1577 25,~~872~~077,~~193~~719.4808 1,~~179~~412,~~442~~048.9697 47,~~621~~182,~~357~~305.8835 Totals ~~145~~178 2024 95 65 ~~266~~302 2224,~~942~~940,~~349~~580.7476 2,~~073~~884,~~480~~188.7091 15,~~554~~248,~~311~~752.3376 1,412,048.97 4144,~~982~~485,~~190~~571.7440 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.~~225124~~206612% 0.000000% 0.000000% 0.~~225124~~206612% 0.~~173601~~179764% 0.000000% 0.000000% 0.~~173601~~179764% 30 Days 2.~~138676~~502296% 0.~~045025~~045914% 0.000000% 0.000000% 2.~~183701~~548209% 21.~~212088~~961225% 0.~~015618~~046859% 0.000000% 0.000000% 2.~~227706~~008083% 60 Days 01.~~562810~~170799% 0.~~067537~~068871% 0.~~675371~~114784% 0.000000% 1.~~305718~~354454% 01.~~467333~~189612% 0.~~024952~~035687% 0.~~715323~~110496% 0.000000% 1.~~207609~~335795% 90 Days 0.~~292661~~114784% 0.~~022512~~068871% 0.~~382710~~665748% 0.000000% 0.~~697884~~849403% 0.~~251179~~117592% 0.~~027554~~045801% 0.~~356166~~648398% 0.000000% 0.~~634899~~811790% 120 Days 0.~~157587~~114784% 0.~~022512~~045914% 0.~~315173~~436180% 0.000000% 0.~~495272~~596878% 0.~~104926~~057943% 0.~~013996~~035054% 0.~~270262~~400999% 0.000000% 0.~~389184~~493996% 150 Days 0.~~045025~~068871% 0.~~022512~~045914% 0.~~292661~~298439% 0.~~022512~~000000% 0.~~382710~~413223% 0.~~009839~~052146% 0.~~005717~~029174% 0.~~373747~~246188% 0.~~031464~~000000% 0.~~420768~~327508% 180+ Days 0.~~067537~~114784% 0.~~045025~~068871% 0.~~472760~~665748% 0.~~112562~~114784% 0.~~697884~~964187% 0.~~058026~~069357% 0.~~019040~~026381% 0.~~388519~~701962% 0.~~159542~~195207% 0.~~625127~~992908% Totals 34.~~264295~~086318% 0.~~450248~~550964% 2.~~138676~~180900% 0.~~135074~~114784% 56.~~988294~~932966% 3.~~103392~~447876% 0.~~280478~~398721% 2.~~104018~~108043% 0.~~191007~~195207% 56.~~678894~~149846%

Delinquency Status By Groups DELINQUENT BANKRUPTCY FORECLOSURE REO Total 1(A) 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 32 0 0 32 ~~288~~193,~~369~~638.9817 0.00 0.00 ~~288~~193,~~369~~638.9817 30 Days 6 0 0 0 6 435,979.54 0.00 0.00 0.00 435,979.54 60 Days 4 1 0 0 75 ~~678~~561,~~169~~329.8292 46,721.86 0.00 0.00 ~~724~~608,~~891~~051.6878 6090 Days 21 0 10 0 31 ~~378~~310,~~003~~083.7527 0.00 ~~34,942~~0.3200 0.00 ~~412~~310,~~946~~083.0727 90120 Days 1 0 0 0 1 54,947.10 0.00 0.00 0.00 54,947.10 ~~120~~150 Days 1 0 1 0 2 61,905.15 0.00 181,835.11 0.00 243,740.26 ~~150~~180 Days 0 0 3 0 3 0.00 0.00 352,834.44 0.00 352,834.44 ~~180 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00~~ Totals 1013 3 4 5 0 1920 1,~~173~~424,~~025~~244.8298 ~~335~~240,~~091~~360.8403 ~~569~~534,~~611~~669.8755 0.00 2,~~077~~199,~~729~~274.5356 0-29 Days 0.~~386100~~262123% 0.000000% 0.000000% 0.~~386100~~262123% 0.~~241006~~164983% 0.000000% 0.000000% 0.~~241006~~164983% 30 Days 0.~~772201~~786370% 0.~~128700~~000000% 0.000000% 0.000000% 0.~~900901~~786370% 0.~~566782~~371462% 0.~~039048~~000000% 0.000000% 0.000000% 0.~~605830~~371462% 60 Days 0.~~257400~~524246% 0.~~000000~~131062% 0.~~128700~~000000% 0.000000% 0.~~386100~~655308% 0.~~315918~~478263% 0.~~000000~~039808% 0.~~029203~~000000% 0.000000% 0.~~345121~~518070% 90 Days 0.~~128700~~131062% 0.000000% 0.000000% 0.000000% 0.~~128700~~131062% 0.~~045922~~264196% 0.000000% 0.000000% 0.000000% 0.~~045922~~264196% 120 Days 0.~~128700~~131062% 0.000000% 0.~~128700~~000000% 0.000000% 0.~~257400~~131062% 0.~~051737~~046816% 0.000000% 0.~~151969~~000000% 0.000000% 0.~~203707~~046816% 150 Days 0.~~000000~~131062% 0.000000% 0.~~386100~~131062% 0.000000% 0.~~386100~~262123% 0.~~000000~~052744% 0.000000% 0.~~294882~~154927% 0.000000% 0.~~294882~~207671% 180 Days 0.000000% 0.000000% 0.~~000000~~393185% 0.000000% 0.~~000000~~393185% 0.000000% 0.000000% 0.~~000000~~300621% 0.000000% 0.~~000000~~300621% Totals 1.~~287001~~703801% 0.~~514801~~393185% 0.~~643501~~524246% 0.000000% 2.~~445302~~621232% 01.~~980359~~213481% 0.~~280054~~204791% 0.~~476055~~455547% 0.000000% 1.~~736468~~873819% DELINQUENT BANKRUPTCY FORECLOSURE REO Total 1(B) 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 10 0 0 10 ~~92,616~~0.3600 0.00 0.00 ~~92,616~~0.3600 30 Days 3345 1 0 0 3446 56,~~102~~022,~~405~~482.4612 68,~~734~~685.5776 0.00 0.00 56,~~171~~091,~~140~~167.0388 60 Days 1317 2 123 0 2722 2,~~164~~746,~~136~~894.9066 ~~125~~211,~~144~~422.6878 1336,~~889,823~~328.5679 0.00 43,~~179~~294,~~105~~646.1423 90 Days 10 1 82 15 0 1918 1255,~~584,016~~555.1866 ~~203~~271,~~698~~988.6196 12,~~165~~362,~~475~~944.2943 0.00 2,~~953~~890,~~190~~489.0805 120 Days 52 1 513 0 1116 ~~657~~194,~~090~~480.8240 ~~103~~203,~~465~~698.6761 ~~675~~2,~~916~~070,635.6624 0.00 12,~~436~~468,~~473~~814.1525 150 Days 01 02 36 0 39 0258,610.0050 0211,035.0019 ~~312~~614,~~936~~601.0953 0.00 ~~312~~1,~~936~~084,247.0922 180 Days 0 0 35 21 56 0.00 0.00 ~~525~~753,~~600~~998.0088 304,826.33 ~~830~~1,~~426~~058,825.3321 Totals 6166 68 3142 21 ~~100~~117 9,~~507~~478,~~649~~023.3634 ~~593~~966,~~659~~831.8930 46,~~569~~138,~~751~~508.6087 304,826.33 1416,~~975~~888,~~887~~189.1884 0-29 Days 0.~~049751~~000000% 0.000000% 0.000000% 0.~~049751~~000000% 0.~~027571~~000000% 0.000000% 0.000000% 0.~~027571~~000000% 30 Days 12.~~641791~~291242% 0.~~049751~~050916% 0.000000% 0.000000% 12.~~691542~~342159% 1.~~518931~~839808% 0.~~020462~~020983% 0.000000% 0.000000% 1.~~539393~~860791% 60 Days 0.~~646766~~865580% 0.~~099502~~101833% 0.~~597015~~152749% 0.000000% 1.~~343284~~120163% 0.~~644240~~839149% 0.~~037254~~064588% 0.~~562580~~102745% 0.000000% 1.~~244075~~006481% 90 Days 0.~~497512~~050916% 0.~~049751~~101833% 0.~~398010~~763747% 0.000000% 0.~~945274~~916497% 0.~~471545~~078070% 0.~~060639~~083090% 0.~~346949~~721856% 0.000000% 0.~~879133~~883015% 120 Days 0.~~248756~~101833% 0.~~049751~~050916% 0.~~248756~~661914% 0.000000% 0.~~547264~~814664% 0.~~195609~~059412% 0.~~030801~~062228% 0.~~201213~~632558% 0.000000% 0.~~427623~~754198% 150 Days 0.~~000000~~050916% 0.~~000000~~101833% 0.~~149254~~305499% 0.000000% 0.~~149254~~458248% 0.~~000000~~079003% 0.~~000000~~064469% 0.~~093158~~187755% 0.000000% 0.~~093158~~331227% 180 Days 0.000000% 0.000000% 0.~~149254~~254582% 0.~~099502~~050916% 0.~~248756~~305499% 0.000000% 0.000000% 0.~~156465~~230339% 0.~~090744~~093121% 0.~~247209~~323460% Totals 3.~~034826~~360489% 0.~~298507~~407332% 12.~~542289~~138493% 0.~~099502~~050916% 45.~~975124~~957230% 2.~~830325~~895441% 0.~~176726~~295357% 1.~~360366~~875253% 0.~~090744~~093121% 45.~~458161~~159172% DELINQUENT BANKRUPTCY FORECLOSURE REO Total 2(A) 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 2 0 0 2 278,188.44 0.00 0.00 278,188.44 30 Days 24 0 0 0 24 3,~~330~~378,~~390~~945.3066 0.00 0.00 0.00 3,~~330~~378,~~390~~945.3066 60 Days 714 0 31 0 1015 ~~568~~1,~~030~~748,547.9149 0.00 ~~464~~321,~~666~~124.6397 0.00 12,~~032~~069,~~697~~672.5446 90 Days 01 0 05 0 06 025,469.0046 0.00 0720,034.0072 0.00 0745,504.0018 120 Days 10 0 10 0 20 ~~56,690~~0.3200 0.00 ~~40,141~~0.7100 0.00 ~~96,832~~0.0300 150 Days 1 0 01 0 12 3056,~~433~~690.7932 0.00 040,141.0071 0.00 3096,~~433~~832.7903 180 Days 34 0 6 1 1011 ~~428~~459,~~966~~400.2908 0.00 973,793.36 377,080.06 1,~~779~~810,~~839~~273.7150 Totals 3644 2 1013 1 4960 45,~~414~~669,~~511~~053.6101 278,188.44 12,~~478~~055,~~601~~094.7076 377,080.06 68,~~548~~379,~~381~~416.8127 0-29 Days 0.~~333333~~337838% 0.000000% 0.000000% 0.~~333333~~337838% 0.~~381672~~389738% 0.000000% 0.000000% 0.~~381672~~389738% 30 Days 4.~~000000~~054054% 0.000000% 0.000000% 0.000000% 4.~~000000~~054054% 4.~~569264~~733859% 0.000000% 0.000000% 0.000000% 4.~~569264~~733859% 60 Days 12.~~166667~~364865% 0.000000% 0.~~500000~~168919% 0.000000% 12.~~666667~~533784% 02.~~779333~~449692% 0.000000% 0.~~637518~~449892% 0.000000% 12.~~416851~~899584% 90 Days 0.~~000000~~168919% 0.000000% 0.~~000000~~844595% 0.000000% 01.~~000000~~013514% 0.~~000000~~035682% 0.000000% 01.~~000000~~008759% 0.000000% 01.~~000000~~044442% 120 Days 0.~~166667~~000000% 0.000000% 0.~~166667~~000000% 0.000000% 0.~~333333~~000000% 0.~~077779~~000000% 0.000000% 0.~~055074~~000000% 0.000000% 0.~~132853~~000000% 150 Days 0.~~166667~~168919% 0.000000% 0.~~000000~~168919% 0.000000% 0.~~166667~~337838% 0.~~041755~~079422% 0.000000% 0.~~000000~~056238% 0.000000% 0.~~041755~~135660% 180 Days 0.~~500000~~675676% 0.000000% 1.~~000000~~013514% 0.~~166667~~168919% 1.~~666667~~858108% 0.~~588538~~643614% 0.000000% 1.~~336035~~364272% 0.~~517350~~528284% 2.~~441923~~536170% Totals 67.~~000000~~432432% 0.~~333333~~337838% 12.~~666667~~195946% 0.~~166667~~168919% 810.~~166667~~135135% 67.~~056668~~942270% 0.~~381672~~389738% 2.~~028628~~879161% 0.~~517350~~528284% 811.~~984318~~739454% DELINQUENT BANKRUPTCY FORECLOSURE REO Total 2(B) 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 45 0 0 45 ~~624~~828,~~202~~518.7168 0.00 0.00 ~~624~~828,~~202~~518.7168 30 Days 3234 01 0 0 3235 74,~~242~~349,~~270~~323.3964 0270,270.0064 0.00 0.00 74,~~242~~619,~~270~~594.3928 60 Days 316 0 1 14 0 1817 ~~344~~3,~~669~~548,415.4189 ~~59,316~~0.0800 2141,~~898,717~~831.7755 0.00 3,~~302~~690,~~703~~247.2644 90 Days 2 01 9 0 1112 ~~217~~259,~~918~~503.7006 059,316.0008 1,~~467~~607,~~543~~277.3465 0.00 1,~~685~~926,~~462~~096.0479 120 Days 02 01 76 0 79 0169,712.0039 049,870.0097 1830,~~100,065~~031.3152 0.00 1,~~100~~049,~~065~~614.3188 150 Days 10 10 75 10 105 ~~42,304~~0.4500 ~~42,266~~0.5900 2944,~~097,219~~246.6246 ~~232,606~~0.0100 2944,~~414,396~~246.6746 180 Days 01 23 1215 23 1622 042,304.0045 ~~140~~190,~~755~~832.1577 12,~~372~~997,~~800~~092.1240 ~~497~~730,~~536~~142.5758 23,~~011~~960,~~091~~372.8420 Totals 3855 811 4936 3 98105 78,~~847~~369,~~162~~259.9543 ~~866~~1,~~540~~398,809.5314 86,~~936~~520,~~346~~479.1658 730,142.58 1817,~~380~~018,~~192~~690.2273 0-29 Days 0.~~379147~~482160% 0.000000% 0.000000% 0.~~379147~~482160% 0.~~296102~~399727% 0.000000% 0.000000% 0.~~296102~~399727% 30 Days 3.~~033175~~278689% 0.~~000000~~096432% 0.000000% 0.000000% 3.~~033175~~375121% 32.~~435501~~098376% 0.~~000000~~130395% 0.000000% 0.000000% 32.~~435501~~228771% 60 Days 01.~~284360~~542912% 0.~~094787~~000000% 10.~~327014~~096432% 0.000000% 1.~~706161~~639344% 01.~~163500~~711970% 0.~~028138~~000000% 10.~~375059~~068428% 0.000000% 1.~~566697~~780398% 90 Days 0.~~189573~~192864% 0.~~000000~~096432% 0.~~853081~~867888% 0.000000% 1.~~042654~~157184% 0.~~103374~~125200% 0.~~000000~~028618% 0.~~696156~~775448% 0.000000% 0.~~799529~~929265% 120 Days 0.~~000000~~192864% 0.~~000000~~096432% 0.~~663507~~578592% 0.000000% 0.~~663507~~867888% 0.~~000000~~081879% 0.~~000000~~024061% 0.~~521836~~400457% 0.000000% 0.~~521836~~506397% 150 Days 0.~~094787~~000000% 0.~~094787~~000000% 0.~~663507~~482160% 0.~~094787~~000000% 0.~~947867~~482160% 0.~~020068~~000000% 0.~~020050~~000000% 0.~~994854~~455561% 0.~~110341~~000000% 10.~~145312~~455561% 180 Days 0.~~000000~~096432% 0.~~189573~~289296% 1.~~137441~~446480% 0.~~189573~~289296% 12.~~516588~~121504% 0.~~000000~~020410% 0.~~066770~~092069% 01.~~651212~~445978% 0.~~236015~~352265% 01.~~953998~~910722% Totals 35.~~601896~~303761% 01.~~758294~~060752% 43.~~644550~~471553% 0.~~284360~~289296% 910.~~289100~~125362% 34.~~722443~~037835% 0.~~411059~~674870% 43.~~239116~~145872% 0.~~346356~~352265% 8.~~718975~~210842%

COLLATERAL STATEMENT Collateral Description Mixed Fixed & Arm Weighted Average Gross Coupon 7.~~859682~~855083% Weighted Average Net Coupon 7.~~359682~~355082% Weighted Average Pass-Through Rate 6.~~679105~~673991% Weighted Average Maturity(Stepdown Calculation ) ~~349~~348 Beginning Scheduled Collateral Loan Count 4,~~564~~442 Number Of Loans Paid In Full ~~122~~86 Ending Scheduled Collateral Loan Count 4,~~442~~356 Beginning Scheduled Collateral Balance ~~762~~738,~~080~~670,~~888~~253.1984 Ending Scheduled Collateral Balance ~~738~~722,~~670~~722,~~253~~477.8459 Ending Actual Collateral Balance at 3130-~~Oct~~Nov-2003 ~~739~~723,~~266~~360,~~997~~765.2784 Monthly P &I Constant 5,~~588~~421,~~704~~233.3960 Special Servicing Fee 0.00 Prepayment Penalties 0.00 Realized Loss Amount ~~48,359~~0.6700 Cumulative Realized Loss 48,360.32 Ending Scheduled Balance for Premium Loans ~~738~~722,~~670~~722,~~253~~477.8459 Scheduled Principal ~~597~~585,~~276~~970.7440 Unscheduled Principal 2215,~~813~~361,~~357~~805.6185

Miscellaneous Reporting Excess Cash Amount 1,~~771~~868,~~079~~033.0255 Overcollateralization Amount 5,769,270.40 Overcollateralization Deficiency 0.00 Targeted Overcollateralization Amount 5,769,270.40

Group Level Collateral Statement Group 1(A) 1(B) 2(A) Collateral Description Fixed 15/30 & ARM Fixed 15/30 & ARM Fixed 15/30 & ARM Weighted Average Coupon Rate 7.~~782932~~768412 7.~~657037~~652188 8.~~788024~~773210 Weighted Average Net Rate 7.~~282932~~268412 7.~~157037~~152187 8.~~288023~~273210 Weighted Average Maturity ~~349~~348 ~~349~~348 ~~346~~345 Beginning Loan Count ~~794~~777 2,~~071~~010 ~~614~~600 Loans Paid In Full 1714 6146 148 Ending Loan Count ~~777~~763 21,~~010~~964 ~~600~~592 Beginning Scheduled Balance ~~122~~119,~~993~~563,~~044~~732.8245 ~~347~~335,~~074~~657,~~614~~519.6781 7472,~~590~~823,~~848~~626.4466 Ending scheduled Balance ~~119~~117,~~563~~272,~~732~~011.4535 ~~335~~327,~~657~~061,~~519~~575.8149 7271,~~823~~307,~~626~~767.6630 Record Date 1011/3130/2003 1011/3130/2003 1011/3130/2003 Principal And Interest Constant ~~906~~881,~~745~~250.1188 2,~~481~~402,~~856~~339.9524 ~~605~~590,~~541~~913.5651 Scheduled Principal ~~109~~107,~~039~~233.6497 ~~267~~261,~~221~~910.0065 5958,~~286~~499.4437 Unscheduled Principal 32,~~320~~184,~~272~~487.7313 118,~~149~~334,~~873~~033.8667 1,~~707~~457,~~935~~359.3499 Scheduled Interest ~~797~~774,~~705~~016.4791 2,~~214~~140,~~635~~428.9559 ~~546~~532,~~255~~414.1214 Servicing Fees 5149,~~247~~818.1321 ~~144~~139,~~614~~857.4534 3130,~~079~~343.5420 Master Servicing Fees 0.00 0.00 0.00 Trustee Fee ~~358~~348.7475 ~~1,012~~979.3400 ~~217~~212.5234 FRY Amount 0.00 0.00 0.00 Special Hazard Fee 0.00 0.00 0.00 Other Fee 4645,~~652~~888.0670 ~~253~~245,~~027~~867.2705 2322,~~098~~447.8287 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 ~~699~~677,~~447~~961.5425 1,~~815~~753,~~981~~725.8920 ~~491~~479,~~859~~410.2473 Realized Loss Amount 0.00 ~~48,359~~0.6700 0.00 Cumulative Realized Loss 0.00 48,360.32 0.00 Percentage of Cumulative Losses 0.0000 0.0130 0.0000 Prepayment Penalties 0.00 0.00 0.00 Special Servicing Fee 0.00 0.00 0.00 Pass-Through Rate 6.~~824265~~804350 6.~~278703~~269695 7.~~912915~~899810

Group Level Collateral Statement Group 2(B) Total Collateral Description Fixed 15/30 & ARM Mixed Fixed & Arm Weighted Average Coupon Rate 7.~~908097~~910178 7.~~859682~~855083 Weighted Average Net Rate 7.~~408097~~410178 7.~~359682~~355082 Weighted Average Maturity ~~346~~345 ~~349~~348 Beginning Loan Count 1,~~085~~055 4,~~564~~442 Loans Paid In Full 3018 ~~122~~86 Ending Loan Count 1,~~055~~037 4,~~442~~356 Beginning Scheduled Balance ~~217~~210,~~422~~625,~~380~~374.2692 ~~762~~738,~~080~~670,~~888~~253.1984 Ending scheduled Balance ~~210~~207,~~625~~081,~~374~~123.9245 ~~738~~722,~~670~~722,~~253~~477.8459 Record Date 1011/3130/2003 1011/3130/2003 Principal And Interest Constant 1,~~594~~546,~~560~~729.7797 5,~~588~~421,~~704~~233.3960 Scheduled Principal ~~161~~158,~~729~~326.6641 ~~597~~585,~~276~~970.7440 Unscheduled Principal 63,~~635~~385,~~275~~925.6806 2215,~~813~~361,~~357~~805.6185 Scheduled Interest 1,~~432~~388,~~831~~403.1156 4,~~991~~835,~~427~~263.6520 Servicing Fees 9087,~~592~~760.6458 ~~317~~307,~~533~~779.7633 Master Servicing Fees 0.00 0.00 Trustee Fee ~~634~~614.1434 2,~~222~~154.7443 FRY Amount 0.00 0.00 Special Hazard Fee 0.00 0.00 Other Fee ~~107~~102,~~211~~893.0074 ~~429~~417,~~989~~097.1536 Pool Insurance Fee 0.00 0.00 Spread Fee 1 0.00 0.00 Spread Fee 2 0.00 0.00 Spread Fee 3 0.00 0.00 Net Interest 1,~~234~~197,~~393~~134.3390 4,~~241~~108,~~682~~232.0008 Realized Loss Amount 0.00 ~~48,359~~0.6700 Cumulative Realized Loss 0.00 48,360.32 Percentage of Cumulative Losses 0.0000 0.0059 Prepayment Penalties 0.00 0.00 Special Servicing Fee 0.00 0.00 Pass-Through Rate 6.~~812877~~820460 6.~~679105~~673991

Filing Compare · STRUCTURED ASSET SEC CORP MORT PASS THR CERTS SER 2003-BC4