8-K 1 sai03bc4.txt OCTOBER 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): October 27, 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 54-2114688 Pooling and Servicing Agreement) (Commission 54-2114689 (State or other File Number) 54-2114690 jurisdiction IRS EIN of Incorporation) 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 October 27, 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 October 27, 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, Assistant Vice President By: Beth Belfield, Assistant Vice President Date: 10/30/03 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 October 27, 2003 distribution. EX-99.1

Structured Asset Investment Loan Trust Mortgage Pass-Through Certificates Record Date: 89/3130/03 Distribution Date: 910/2527/03 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.~~23000~~24000% ~~234~~225,~~144~~496,~~925~~432.2322 ~~247~~248,~~998~~547.5017 8,~~648~~747,~~493~~386.0112 1-A2 86358EBG0 SEN 1.93000% 183,309,000.00 294,821.9897 0.00 2-A1 86358EBH8 SEN 1.~~23000~~24000% ~~145~~135,~~757~~894,~~559~~609.0838 ~~154~~149,~~381~~786.5506 98,~~862~~232,~~949~~037.7069 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,~~680~~679.0098 0.00 M1 86358EBL9 MEZ 1.~~91000~~92000% 35,434,000.00 5860,~~279~~474.0903 0.00 M2 86358EBM7 MEZ 3.~~11000~~12000% 37,082,000.00 99102,~~307~~840.6675 0.00 M3 86358EBN5 MEZ 3.~~36000~~37000% 10,301,000.00 2930,~~804~~857.2322 0.00 M4 86358EBP0 MEZ 4.~~36000~~37000% 12,361,000.00 4648,~~408~~015.6962 0.00 M5 86358EBQ8 MEZ 4.~~61000~~62000% 7,004,000.00 2728,~~803~~763.9309 0.00 B 86358EBR6 SEN 4.~~61000~~62000% 7,416,000.00 2930,~~439~~455.4604 0.00 X SAI03BC4X SEN 0.00000% 5,769,270.40 1,~~901~~786,~~193~~250.3616 0.00 P SAI03BC4P SEN 0.00000% 100.00 ~~189~~232,~~991~~880.2509 0.00 R SAI03B4R3 SEN 0.00000% 0.00 0.00 0.00 Totals ~~797~~779,~~571~~060,~~854~~412.7100 4,~~628~~562,~~506~~768.8937 1816,~~511~~979,~~442~~423.7181

Certificateholder Distribution Summary (continued) Current Ending Cumulative Realized Certificate Total Realized Class Loss Balance Distribution Losses 1-A1 0.00 ~~225~~216,~~496~~749,~~432~~046.2210 8,~~896~~995,~~491~~933.5129 0.00 1-A2 0.00 183,309,000.00 294,821.9897 0.00 2-A1 0.00 ~~135~~127,~~894~~662,~~609~~571.3869 108,~~017~~381,~~331~~823.2575 0.00 2-A2 0.00 118,993,000.00 189,397.19 0.00 A-IO 0.00 0.00 1,359,~~680~~679.0098 0.00 M1 0.00 35,434,000.00 5860,~~279~~474.0903 0.00 M2 0.00 37,082,000.00 99102,~~307~~840.6675 0.00 M3 0.00 10,301,000.00 2930,~~804~~857.2322 0.00 M4 0.00 12,361,000.00 4648,~~408~~015.6962 0.00 M5 0.00 7,004,000.00 2728,~~803~~763.9309 0.00 B 0.00 7,416,000.00 2930,~~439~~455.4604 0.00 X 0.00 5,769,270.40 1,~~901~~786,~~193~~250.3616 0.00 P 0.00 100.00 ~~189~~232,~~991~~880.2509 0.00 R 0.00 0.00 0.00 0.00 Totals 0.00 ~~779~~762,~~060~~080,~~412~~988.0019 2321,~~139~~542,~~949~~192.6018 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 ~~234~~225,~~144~~496,~~925~~432.2322 0.00 8,~~648~~747,~~493~~386.0112 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 ~~145~~135,~~757~~894,~~559~~609.0838 0.00 98,~~862~~232,~~949~~037.7069 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 ~~797~~779,~~571~~060,~~854~~412.7100 0.00 1816,~~511~~979,~~442~~423.7181 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 8,~~648~~747,~~493~~386.0112 ~~225~~216,~~496~~749,~~432~~046.2210 0.~~91386969~~87841915 8,~~648~~747,~~493~~386.0112 1-A2 0.00 183,309,000.00 1.00000000 0.00 2-A1 98,~~862~~232,~~949~~037.7069 ~~135~~127,~~894~~662,~~609~~571.3869 0.~~85130463~~79973546 98,~~862~~232,~~949~~037.7069 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 1816,~~511~~979,~~442~~423.7181 ~~779~~762,~~060~~080,~~412~~988.0019 0.~~94540502~~92480016 1816,~~511~~979,~~442~~423.7181

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 ~~948~~913.~~91944944~~86969033 0.00000000 35.~~04975911~~45054335 0.00000000 1-A2 183,309,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 2-A1 159,631,000.00 ~~913~~851.~~09055935~~30462993 0.00000000 6151.~~78592942~~56916695 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 35.~~04975911~~45054335 ~~913~~878.~~86969033~~41914699 0.~~91386969~~87841915 35.~~04975911~~45054335 1-A2 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 2-A1 0.00000000 6151.~~78592942~~56916695 ~~851~~799.~~30462993~~73546297 0.~~85130463~~79973546 6151.~~78592942~~56916695 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, ~~Bankrupcy~~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.~~23000~~24000% ~~234~~225,~~144~~496,~~925~~432.2322 ~~247~~248,~~998~~547.5018 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.~~23000~~24000% ~~145~~135,~~757~~894,~~559~~609.0838 ~~154~~149,~~381~~786.5506 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% 271,936,000.00 1,359,680.00 0.00 0.00 M1 35,434,000.00 1.~~91000~~92000% 35,434,000.00 5860,~~279~~474.0903 0.00 0.00 M2 37,082,000.00 3.~~11000~~12000% 37,082,000.00 99102,~~307~~840.6675 0.00 0.00 M3 10,301,000.00 3.~~36000~~37000% 10,301,000.00 2930,~~804~~857.2322 0.00 0.00 M4 12,361,000.00 4.~~36000~~37000% 12,361,000.00 4648,~~408~~015.6962 0.00 0.00 M5 7,004,000.00 4.~~61000~~62000% 7,004,000.00 2728,~~803~~763.9309 0.00 0.00 B 7,416,000.00 4.~~61000~~62000% 7,416,000.00 2930,~~439~~455.4604 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,~~537~~543,~~322~~638.2816 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 ~~247~~248,~~998~~547.5017 0.00 ~~225~~216,~~496~~749,~~432~~046.2210 1-A2 0.00 0.00 294,821.9897 0.00 183,309,000.00 2-A1 0.00 0.00 ~~154~~149,~~381~~786.5506 0.00 ~~135~~127,~~894~~662,~~609~~571.3869 2-A2 0.00 0.00 189,397.19 0.00 118,993,000.00 A-IO 0.00 0.00 1,359,~~680~~679.0098 0.00 271,936,000.00 M1 0.00 0.00 5860,~~279~~474.0903 0.00 35,434,000.00 M2 0.00 0.00 99102,~~307~~840.6675 0.00 37,082,000.00 M3 0.00 0.00 2930,~~804~~857.2322 0.00 10,301,000.00 M4 0.00 0.00 4648,~~408~~015.6962 0.00 12,361,000.00 M5 0.00 0.00 2728,~~803~~763.9309 0.00 7,004,000.00 B 0.00 0.00 2930,~~439~~455.4604 0.00 7,416,000.00 X 0.00 0.00 1,~~901~~786,~~193~~250.3616 0.00 5,769,270.40 P 0.00 0.00 ~~189~~232,~~991~~880.2509 0.00 100.00 R 0.00 0.00 0.00 0.00 0.00 Totals 0.00 0.00 4,~~628~~562,~~506~~768.8937 0.00 (4) Amount Does Not Include Excess Special Hazard, ~~Bankrupcy~~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.~~23000~~24000% ~~948~~913.~~91944944~~86969033 1.~~00506385~~00728749 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.~~23000~~24000% ~~913~~851.~~09055935~~30462993 0.~~96711510~~93832689 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% 1000.00000000 5.00000000 0.00000000 0.00000000 M1 35,434,000.00 1.~~91000~~92000% 1000.00000000 1.~~64472230~~70666676 0.00000000 0.00000000 M2 37,082,000.00 3.~~11000~~12000% 1000.00000000 2.~~67805566~~77333342 0.00000000 0.00000000 M3 10,301,000.00 3.~~36000~~37000% 1000.00000000 2.~~89333366~~99555577 0.00000000 0.00000000 M4 12,361,000.00 4.~~36000~~37000% 1000.00000000 3.~~75444462~~88444462 0.00000000 0.00000000 M5 7,004,000.00 4.~~61000~~62000% 1000.00000000 34.~~96972159~~10666619 0.00000000 0.00000000 B 7,416,000.00 4.~~61000~~62000% 1000.00000000 34.~~96972222~~10666667 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 1.~~00506385~~00728745 0.00000000 ~~913~~878.~~86969033~~41914699 1-A2 0.00000000 0.00000000 1.~~60833336~~60833331 0.00000000 1000.00000000 2-A1 0.00000000 0.00000000 0.~~96711510~~93832689 0.00000000 ~~851~~799.~~30462993~~73546297 2-A2 0.00000000 0.00000000 1.59166665 0.00000000 1000.00000000 A-IO 0.00000000 0.00000000 54.~~00000000~~99999993 0.00000000 1000.00000000 M1 0.00000000 0.00000000 1.~~64472230~~70666676 0.00000000 1000.00000000 M2 0.00000000 0.00000000 2.~~67805566~~77333342 0.00000000 1000.00000000 M3 0.00000000 0.00000000 2.~~89333366~~99555577 0.00000000 1000.00000000 M4 0.00000000 0.00000000 3.~~75444462~~88444462 0.00000000 1000.00000000 M5 0.00000000 0.00000000 34.~~96972159~~10666619 0.00000000 1000.00000000 B 0.00000000 0.00000000 34.~~96972222~~10666667 0.00000000 1000.00000000 X 0.00000000 0.00000000 ~~329~~309.~~53791869~~61456755 0.00000000 1000.00000000 P 0.00000000 0.00000000 ~~1899912~~2328800.~~50000000~~90000000 0.00000000 1000.00000000 R 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 (6) Amount Does Not Include Excess Special Hazard, ~~Bankrupcy~~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 2322,~~930~~316,~~506~~351.3380 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 2322,~~930~~316,~~506~~351.3380 Withdrawals Reimbursement for Servicer Advances 0.00 Payment of Service Fee ~~790~~774,~~556~~159.7362 Payment of Interest and Principal 2321,~~139~~542,~~949~~192.6018 Total Withdrawals (Pool Distribution Amount) 2322,~~930~~316,~~506~~351.3380 Ending Balance 0.00

SERVICING FEES Gross Servicing Fee ~~332~~324,~~321~~608.5640 Credit Risk Manager's Fee 9,~~969~~738.6525 PMI Insurance Premium Fee ~~445~~437,~~939~~540.5590 Securities Administration Fee (LEO TEST) 0.00 Wells Fargo Bank Minnesota, NA 2,~~325~~272.9707 Supported Prepayment/Curtailment Interest Shortfall 0.00 Net Servicing Fee ~~790~~774,~~556~~159.7362

OTHER ACCOUNTS Beginning Current Current Ending Account Type Balance Withdrawals Deposits Balance Reserve Fund 1,000.00 0.4544 0.4544 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 67 0 0 67 ~~741~~765,~~073~~390.0525 0.00 0.00 ~~741~~765,~~073~~390.0525 30 Days 6596 13 0 0 6699 1014,~~919~~974,~~488~~221.4121 ~~203~~404,~~698~~867.6147 0.00 0.00 1115,~~123~~379,~~187~~088.0268 60 Days 1917 12 1320 0 3339 2,~~221~~229,~~348~~089.7179 30321,~~141~~570.9564 23,~~625~~386,~~078~~435.0889 0.00 45,~~876~~937,~~568~~096.7432 90 Days 511 10 1715 0 2326 ~~502~~1,~~063~~300,390.6365 ~~103,500~~0.00 32,~~572~~610,~~293~~518.8130 0.00 43,~~177~~910,~~857~~908.4495 120 Days 12 2 2415 0 2719 2572,~~846~~738.9124 ~~394~~145,~~805~~766.8359 43,~~258~~390,~~722~~405.1033 0.00 43,~~679~~608,~~374~~910.8416 150 Days 21 04 620 01 826 ~~143~~25,~~909~~846.5491 0879,755.0015 ~~635~~3,~~288~~566,786.8421 056,986.0057 ~~779~~4,~~198~~529,374.3884 180+ Days 01 0 06 0 07 084,928.0040 0.00 0604,254.0098 0.00 0689,183.0038 Totals 92128 1118 6076 01 ~~163~~223 1318,~~812~~687,~~657~~215.20 12,~~473~~517,~~219~~350.4410 1113,~~091~~558,~~382~~400.8371 056,986.0057 2634,~~377~~819,~~259~~952.4758 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.~~128977~~153374% 0.000000% 0.000000% 0.~~128977~~153374% 0.~~095052~~100355% 0.000000% 0.000000% 0.~~095052~~100355% 30 Days 12.~~397248~~103418% 0.~~021496~~065732% 0.000000% 0.000000% 12.~~418745~~169150% 1.~~400569~~963370% 0.~~026127~~053085% 0.000000% 0.000000% 12.~~426696~~016455% 60 Days 0.~~408426~~372480% 0.~~021496~~043821% 0.~~279450~~438212% 0.000000% 0.~~709372~~854514% 0.~~284917~~292271% 0.~~003866~~042163% 0.~~336701~~444018% 0.000000% 0.~~625485~~778452% 90 Days 0.~~107481~~241017% 0.~~021496~~000000% 0.~~365434~~328659% 0.000000% 0.~~494411~~569676% 0.~~064396~~170503% 0.~~013275~~000000% 0.~~458194~~342282% 0.000000% 0.~~535866~~512785% 120 Days 0.~~021496~~043821% 0.~~042992~~043821% 0.~~515907~~328659% 0.000000% 0.~~580396~~416301% 0.~~003315~~009537% 0.~~050639~~019112% 0.~~546238~~444539% 0.000000% 0.~~600192~~473188% 150 Days 0.~~042992~~021911% 0.~~000000~~087642% 0.~~128977~~438212% 0.~~000000~~021911% 0.~~171969~~569676% 0.~~018458~~003389% 0.~~000000~~115351% 0.~~081484~~467665% 0.~~000000~~007472% 0.~~099943~~593877% 180+ Days 0.~~000000~~021911% 0.000000% 0.~~000000~~131464% 0.000000% 0.~~000000~~153374% 0.~~000000~~011136% 0.000000% 0.~~000000~~079228% 0.000000% 0.~~000000~~090363% Totals 12.~~977644~~804557% 0.~~236457~~394391% 1.~~289768~~665206% 0.~~000000~~021911% 34.~~503869~~886065% 12.~~771656~~450205% 0.~~188960~~330067% 1.~~422617~~777732% 0.~~000000~~007472% 34.~~383233~~565476%

Delinquency Status By Groups

~~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 23 0 0 23 ~~247~~288,~~142~~479.2436 0.00 0.00 ~~247~~288,~~142~~479.2436 30 Days 24 0 0 0 24 ~~490~~281,~~932~~070.4935 0.00 0.00 0.00 ~~490~~281,~~932~~070.4935 60 Days 21 0 20 0 41 ~~150~~54,~~604~~947.5510 0.00 ~~492,197~~0.1500 0.00 ~~642~~54,~~801~~947.7010 90 Days 12 0 32 0 4 61178,~~937~~775.01 0.00 ~~352~~492,~~834~~197.4415 0.00 ~~414~~670,~~771~~972.4516 120 Days 0 0 03 0 03 0.00 0.00 0352,834.0044 0.00 0352,834.0044 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 57 23 5 0 1215 ~~703~~514,~~474~~792.0546 ~~247~~288,~~142~~479.2436 845,031.59 0.00 1,~~795~~648,~~647~~303.8841 0-29 Days 0.~~249066~~377834% 0.000000% 0.000000% 0.~~249066~~377834% 0.~~198517~~234375% 0.000000% 0.000000% 0.~~198517~~234375% 30 Days 0.~~249066~~503778% 0.000000% 0.000000% 0.000000% 0.~~249066~~503778% 0.~~394341~~228356% 0.000000% 0.000000% 0.000000% 0.~~394341~~228356% 60 Days 0.~~249066~~125945% 0.000000% 0.~~249066~~000000% 0.000000% 0.~~498132~~125945% 0.~~120973~~044642% 0.000000% 0.~~395356~~000000% 0.000000% 0.~~516329~~044642% 90 Days 0.~~124533~~251889% 0.000000% 0.~~373599~~251889% 0.000000% 0.~~498132~~503778% 0.~~049751~~145246% 0.000000% 0.~~283414~~399885% 0.000000% 0.~~333164~~545131% 120 Days 0.000000% 0.000000% 0.~~000000~~377834% 0.000000% 0.~~000000~~377834% 0.000000% 0.000000% 0.~~000000~~286660% 0.000000% 0.~~000000~~286660% 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.~~622665~~881612% 0.~~249066~~377834% 0.~~622665~~629723% 0.000000% 1.~~494396~~889169% 0.~~565064~~418243% 0.~~198517~~234375% 0.~~678770~~686546% 0.000000% 1.~~442351~~339164% 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 21 0 0 21 ~~173~~92,~~232~~616.9936 0.00 0.00 ~~173~~92,~~232~~616.9936 30 Days 2940 1 0 0 3041 46,~~593~~537,~~275~~777.3124 ~~203~~75,~~698~~028.6162 0.00 0.00 46,~~796~~612,~~973~~805.9286 60 Days 910 12 59 0 1521 1,~~435~~573,~~367~~194.5110 30321,~~141~~570.9564 ~~727~~1,~~533~~446,856.5008 0.00 23,~~193~~341,~~042~~620.9682 90 Days 17 10 4 0 611 62975,~~331~~018.5660 ~~103,500~~0.00 ~~511~~645,~~760~~774.3871 0.00 ~~677~~1,~~591~~620,793.9431 120 Days 0 1 63 0 74 0.00 ~~304~~103,~~000~~500.00 1312,~~145,426~~936.3309 0.00 1416,~~449,426~~436.3309 150 Days 0 01 05 0 06 0.00 0304,000.00 0995,426.0033 0.00 01,299,426.0033 180 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 Totals 3957 6 1521 0 6084 69,~~090~~085,~~974~~989.3894 ~~814~~896,~~573~~715.5562 23,~~384~~400,~~720~~993.21 0.00 913,~~290~~383,~~268~~698.1477 0-29 Days 0.~~094832~~048286% 0.000000% 0.000000% 0.~~094832~~048286% 0.~~048844~~026665% 0.000000% 0.000000% 0.~~048844~~026665% 30 Days 1.~~375059~~931434% 0.~~047416~~048286% 0.000000% 0.000000% 1.~~422475~~979720% 1.~~295087~~882251% 0.~~057433~~021601% 0.000000% 0.000000% 1.~~352520~~903852% 60 Days 0.~~426743~~482859% 0.~~047416~~096572% 0.~~237079~~434573% 0.000000% 01.~~711238~~014003% 0.~~404706~~452929% 0.~~008499~~092581% 0.~~205130~~416555% 0.000000% 0.~~618335~~962065% 90 Days 0.~~047416~~338001% 0.~~047416~~000000% 0.~~189663~~193143% 0.000000% 0.~~284495~~531144% 0.~~017575~~280712% 0.~~029182~~000000% 0.~~144292~~185921% 0.000000% 0.~~191049~~466633% 120 Days 0.000000% 0.~~047416~~048286% 0.~~284495~~144858% 0.000000% 0.~~331911~~193143% 0.000000% 0.~~085714~~029798% 0.~~322956~~090096% 0.000000% 0.~~408670~~119894% 150 Days 0.000000% 0.~~000000~~048286% 0.~~000000~~241429% 0.000000% 0.~~000000~~289715% 0.000000% 0.~~000000~~087523% 0.~~000000~~286587% 0.000000% 0.~~000000~~374110% 180 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% Totals 12.~~849218~~752294% 0.~~284495~~289715% 01.~~711238~~014003% 0.000000% 24.~~844950~~056012% 12.~~717367~~615891% 0.~~229671~~258168% 0.~~672379~~979159% 0.000000% 23.~~619417~~853218% 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 1 0 0 1 ~~246~~245,~~001~~848.41 0.00 0.00 ~~246~~245,~~001~~848.41 30 Days 921 0 0 0 921 12,~~355~~715,~~920~~122.7635 0.00 0.00 0.00 12,~~355~~715,~~920~~122.7635 60 Days 4 0 0 0 4 ~~222~~231,~~626~~203.4680 0.00 0.00 0.00 ~~222~~231,~~626~~203.4680 90 Days 1 0 1 0 2 3056,~~433~~690.7932 0.00 ~~245~~40,~~854~~141.4271 0.00 ~~276~~96,~~288~~832.2103 120 Days 1 0 70 0 81 2530,~~846~~433.9179 0.00 ~~1,610,083~~0.2600 0.00 130,~~635,930~~433.1779 150 Days 21 01 06 0 28 ~~143~~25,~~909~~846.5491 0435,000.00 01,175,083.0026 0.00 ~~143~~1,~~909~~635,930.5417 180 Days 01 0 01 0 02 084,928.0040 0.00 058,981.0014 0.00 0143,909.0054 Totals 1729 12 8 0 2639 13,~~778~~144,~~737~~225.4657 ~~246~~680,~~001~~848.41 1,~~855~~274,~~937~~206.6811 0.00 35,~~880~~099,~~676~~280.5509 0-29 Days 0.~~157978~~162866% 0.000000% 0.000000% 0.~~157978~~162866% 0.~~316061~~329323% 0.000000% 0.000000% 0.~~316061~~329323% 30 Days 13.~~421801~~420195% 0.000000% 0.000000% 0.000000% 13.~~421801~~420195% 13.~~742078~~637007% 0.000000% 0.000000% 0.000000% 13.~~742078~~637007% 60 Days 0.~~631912~~651466% 0.000000% 0.000000% 0.000000% 0.~~631912~~651466% 0.~~286029~~309706% 0.000000% 0.000000% 0.000000% 0.~~286029~~309706% 90 Days 0.~~157978~~162866% 0.000000% 0.~~157978~~162866% 0.000000% 0.~~315956~~325733% 0.~~039101~~075939% 0.000000% 0.~~315872~~053771% 0.000000% 0.~~354973~~129710% 120 Days 0.~~157978~~162866% 0.000000% 10.~~105845~~000000% 0.000000% 10.~~263823~~162866% 0.~~033208~~040767% 0.000000% 20.~~068624~~000000% 0.000000% 20.~~101832~~040767% 150 Days 0.~~315956~~162866% 0.~~000000~~162866% 0.~~000000~~977199% 0.000000% 01.~~315956~~302932% 0.~~184894~~034623% 0.~~000000~~582699% 01.~~000000~~574067% 0.000000% 02.~~184894~~191389% 180 Days 0.~~000000~~162866% 0.000000% 0.~~000000~~162866% 0.000000% 0.~~000000~~325733% 0.~~000000~~113765% 0.000000% 0.~~000000~~079007% 0.000000% 0.~~000000~~192772% Totals 24.~~685624~~723127% 0.~~157978~~325733% 1.~~263823~~302932% 0.000000% 46.~~107425~~351792% 24.~~285310~~211806% 0.~~316061~~912022% 21.~~384496~~706846% 0.000000% 46.~~985867~~830674% 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 12 0 0 12 74138,~~696~~446.4112 0.00 0.00 74138,~~696~~446.4112 30 Days 2531 02 0 0 2533 45,~~479~~440,~~359~~251.8527 0329,838.0085 0.00 0.00 45,~~479~~770,~~359~~090.8512 60 Days 42 0 611 0 1013 ~~412~~369,~~750~~744.1979 0.00 1,~~405~~939,~~347~~579.4381 0.00 12,~~818~~309,~~097~~324.6260 90 Days 21 0 98 0 119 ~~347~~89,~~361~~906.2772 0.00 21,~~461~~432,~~844~~404.5773 0.00 21,~~809~~522,~~205~~311.8445 120 Days 01 1 119 0 1211 042,304.0045 9042,~~805~~266.8359 12,~~503~~724,~~212~~634.5180 0.00 12,~~594~~809,~~018~~205.3484 150 Days 0 02 69 01 612 0.00 0140,755.0015 ~~635~~1,~~288~~396,276.8462 056,986.0057 ~~635~~1,~~288~~594,018.8434 180 Days 0 0 05 0 05 0.00 0.00 0545,273.0084 0.00 0545,273.0084 Totals 3135 27 3242 01 6585 5,~~239~~942,~~471~~207.3123 ~~165~~651,~~502~~306.2471 68,~~005~~038,~~693~~169.3580 056,986.0057 1114,~~410~~688,~~666~~670.9031 0-29 Days 0.~~090334~~184332% 0.000000% 0.000000% 0.~~090334~~184332% 0.~~033549~~063623% 0.000000% 0.000000% 0.~~033549~~063623% 30 Days 2.~~258356~~857143% 0.~~000000~~184332% 0.000000% 0.000000% 23.~~258356~~041475% 2.~~011847~~500068% 0.~~000000~~151577% 0.000000% 0.000000% 2.~~011847~~651645% 60 Days 0.~~361337~~184332% 0.000000% 01.~~542005~~013825% 0.000000% 01.~~903342~~198157% 0.~~185381~~169916% 0.000000% 0.~~631194~~891334% 0.000000% 01.~~816575~~061250% 90 Days 0.~~180668~~092166% 0.000000% 0.~~813008~~737327% 0.000000% 0.~~993677~~829493% 0.~~156013~~041317% 0.000000% 10.~~105706~~658262% 0.000000% 10.~~261719~~699578% 120 Days 0.~~000000~~092166% 0.~~090334~~092166% 0.~~993677~~829493% 0.000000% 1.~~084011~~013825% 0.~~000000~~019441% 0.~~040784~~019424% 01.~~675149~~252106% 0.000000% 01.~~715933~~290971% 150 Days 0.000000% 0.~~000000~~184332% 0.~~542005~~829493% 0.~~000000~~092166% 01.~~542005~~105991% 0.000000% 0.~~000000~~064684% 0.~~285332~~641659% 0.~~000000~~026188% 0.~~285332~~732531% 180 Days 0.000000% 0.000000% 0.~~000000~~460829% 0.000000% 0.~~000000~~460829% 0.000000% 0.000000% 0.~~000000~~250581% 0.000000% 0.~~000000~~250581% Totals 23.~~800361~~225806% 0.~~180668~~645161% 23.~~890696~~870968% 0.~~000000~~092166% 57.~~871725~~834101% 2.~~353241~~730742% 0.~~074333~~299308% 23.~~697380~~693941% 0.~~000000~~026188% 56.~~124955~~750179%

COLLATERAL STATEMENT Collateral Description Mixed Fixed & Arm Weighted Average Gross Coupon 7.~~867622~~861853% Weighted Average Net Coupon 7.~~367622~~361853% Weighted Average Pass-Through Rate 6.~~693176~~684401% Weighted Average Maturity(Stepdown Calculation ) ~~351~~350 Beginning Scheduled Collateral Loan Count 4,~~739~~652 Number Of Loans Paid In Full 8788 Ending Scheduled Collateral Loan Count 4,~~652~~564 Beginning Scheduled Collateral Balance ~~797~~779,~~571~~060,~~754~~312.7100 Ending Scheduled Collateral Balance ~~779~~762,~~060~~080,~~312~~888.0019 Ending Actual Collateral Balance at 3130-~~Aug~~Sep-2003 ~~779~~762,~~646~~679,~~477~~567.6843 Monthly P &I Constant 5,~~843~~709,~~102~~399.1959 Special Servicing Fee 0.00 Prepayment Penalties 0.00 Realized Loss Amount 0.00 Cumulative Realized Loss 0.65 Ending Scheduled Balance for Premium Loans ~~779~~762,~~060~~080,~~312~~888.0019 Scheduled Principal ~~613~~605,~~941~~351.1187 Unscheduled Principal 1716,~~897~~374,~~501~~071.6094

Miscellaneous Reporting Excess Cash Amount 1,~~901~~786,~~192~~249.9172 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.~~785696~~783303 7.~~670530~~664107 8.~~744460~~773091 Weighted Average Net Rate 7.~~285696~~283303 7.~~170530~~164107 8.~~244459~~273091 Weighted Average Maturity ~~351~~350 ~~351~~350 ~~348~~347 Beginning Loan Count ~~812~~803 2,~~144~~109 ~~652~~633 Loans Paid In Full 9 3538 19 Ending Loan Count ~~803~~794 2,~~109~~071 ~~633~~614 Beginning Scheduled Balance ~~126~~124,~~028~~403,~~036~~600.9012 ~~361~~354,~~435~~411,~~501~~445.7249 8177,~~841~~772,~~562~~186.5664 Ending scheduled Balance ~~124~~122,~~403~~993,~~600~~044.1282 ~~354~~347,~~411~~074,~~445~~614.4967 7774,~~772~~590,~~186~~848.6444 Record Date 0809/3130/2003 0809/3130/2003 0809/3130/2003 Principal And Interest Constant ~~927~~916,~~293~~177.1384 2,~~583~~534,~~816~~007.0575 ~~660~~629,~~089~~768.5403 Scheduled Principal 109,~~613~~285.1438 ~~273~~270,~~481~~468.2736 6361,~~706~~182.0163 Unscheduled Principal 1,~~514~~301,~~823~~269.6492 67,~~750~~066,~~574~~362.9646 43,~~005~~120,~~669~~155.9157 Scheduled Interest ~~817~~806,~~679~~892.9946 2,~~310~~263,~~334~~539.7839 ~~596~~568,~~383~~585.5340 Servicing Fees 5251,~~511~~834.6683 ~~150~~147,~~598~~671.0941 3432,~~100~~405.6706 Master Servicing Fees 0.00 0.00 0.00 Trustee Fee ~~367~~362.5685 1,~~054~~033.2473 ~~238~~226.6880 FRY Amount 0.00 0.00 0.00 Special Hazard Fee 0.00 0.00 0.00 Other Fee 4746,~~328~~943.5172 ~~261~~256,~~038~~625.8551 2624,~~365~~601.8213 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 ~~717~~707,~~472~~751.2606 1,~~897~~858,~~643~~208.6074 ~~535~~511,~~678~~352.3641 Realized Loss Amount 0.00 0.00 0.00 Cumulative Realized Loss 0.00 0.65 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 6.~~831549~~826983 6.~~300356~~291700 7.~~854372~~890004

Group Level Collateral Statement Group 2(B) Total Collateral Description Fixed 15/30 & ARM Mixed Fixed & Arm Weighted Average Coupon Rate 7.~~910552~~902244 7.~~867622~~861853 Weighted Average Net Rate 7.~~410552~~402244 7.~~367622~~361853 Weighted Average Maturity ~~348~~347 ~~351~~350 Beginning Loan Count 1,~~131~~107 4,~~739~~652 Loans Paid In Full 2422 8788 Ending Loan Count 1,~~107~~085 4,~~652~~564 Beginning Scheduled Balance ~~228~~222,~~266~~473,~~653~~079.5375 ~~797~~779,~~571~~060,~~754~~312.7100 Ending scheduled Balance ~~222~~217,~~473~~422,~~079~~380.7526 ~~779~~762,~~060~~080,~~312~~888.0019 Record Date 0809/3130/2003 0809/3130/2003 Principal And Interest Constant 1,~~671~~629,~~903~~445.4797 5,~~843~~709,~~102~~399.1959 Scheduled Principal ~~167~~164,~~140~~415.6950 ~~613~~605,~~941~~351.1187 Unscheduled Principal 54,~~626~~886,~~433~~283.0999 1716,~~897~~374,~~501~~071.6094 Scheduled Interest 1,~~504~~465,~~762~~030.7847 5,~~229~~104,~~161~~047.0872 Servicing Fees 9592,~~111~~697.1310 ~~332~~324,~~321~~608.5540 Master Servicing Fees 0.00 0.00 Trustee Fee ~~665~~648.7687 2,~~326~~272.2425 FRY Amount 0.00 0.00 Special Hazard Fee 0.00 0.00 Other Fee ~~111~~109,~~206~~370.3358 ~~445~~437,~~939~~540.5194 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,~~297~~262,~~779~~313.5692 4,~~448~~339,~~573~~626.7813 Realized Loss Amount 0.00 0.00 Cumulative Realized Loss 0.00 0.65 Percentage of Cumulative Losses 0.00 0.00 Prepayment Penalties 0.00 0.00 Special Servicing Fee 0.00 0.00 Pass-Through Rate 6.~~822440~~808809 6.~~693176~~684401

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