8-K 1 sai03bc4_sep.txt SEPTEMBER 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): September 25, 2003 STRUCTURED ASSET INVESTMENT LOAN TRUST Mortgage Pass-Through Certificates, Series 2003-BC4 Trust (Exact name of registrant as specified in its charter) 54-2114688 54-2114689 New York (governing law of 333-102489-10 54-2114690 Pooling and Servicing Agreement) (Commission IRS EIN (State or other File Number) jurisdiction 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 September 25, 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 September 25, 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: 10/6/03 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 September 25, 2003 distribution. EX-99.1

Structured Asset Investment Loan Trust Mortgage Pass-Through Certificates Record Date: 78/31/03 Distribution Date: 89/25/03 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.~~22000~~23000% ~~240~~234,~~229~~144,~~933~~925.3323 ~~252~~247,~~374~~998.8950 68,~~085~~648,~~008~~493.1001 1-A2 86358EBG0 SEN 1.93000% 183,309,000.00 294,821.98 0.00 2-A1 86358EBH8 SEN 1.~~22000~~23000% ~~151~~145,~~525~~757,~~741~~559.8108 ~~159~~154,~~186~~381.2155 59,~~768~~862,~~182~~949.7370 2-A2 86358EBJ4 SEN 1.91000% 118,993,000.00 189,397.19 0.00 A-IO 86358EBK1 IO 6.00000% 0.00 1,359,680.00 0.00 M1 86358EBL9 MEZ 1.~~90000~~91000% 35,434,000.00 5758,~~973~~279.9609 0.00 M2 86358EBM7 MEZ 3.~~10000~~11000% 37,082,000.00 9899,~~988~~307.3466 0.00 M3 86358EBN5 MEZ 3.~~35000~~36000% 10,301,000.00 29,~~715~~804.5223 0.00 M4 86358EBP0 MEZ 4.~~35000~~36000% 12,361,000.00 46,~~302~~408.2569 0.00 M5 86358EBQ8 MEZ 4.~~60000~~61000% 7,004,000.00 27,~~743~~803.6293 0.00 B 86358EBR6 SEN 4.~~60000~~61000% 7,416,000.00 29,~~375~~439.6046 0.00 X SAI03BC4X SEN 0.00000% 5,769,270.40 1,~~962~~901,~~017~~193.9236 0.00 P SAI03BC4P SEN 0.00000% 100.00 ~~100~~189,~~781~~991.4325 0.00 R SAI03B4R3 SEN 0.00000% 0.00 0.00 0.00 Totals ~~809~~797,~~425~~571,~~045~~854.5471 4,~~608~~628,~~358~~506.9189 1118,~~853~~511,~~190~~442.8371

Certificateholder Distribution Summary (continued) Current Ending Cumulative Realized Certificate Total Realized Class Loss Balance Distribution Losses 1-A1 0.00 ~~234~~225,~~144~~496,~~925~~432.2322 68,~~337~~896,~~382~~491.9951 0.00 1-A2 0.00 183,309,000.00 294,821.98 0.00 2-A1 0.00 ~~145~~135,~~757~~894,~~559~~609.0838 510,~~927~~017,~~368~~331.9425 0.00 2-A2 0.00 118,993,000.00 189,397.19 0.00 A-IO 0.00 0.00 1,359,680.00 0.00 M1 0.00 35,434,000.00 5758,~~973~~279.9609 0.00 M2 0.00 37,082,000.00 9899,~~988~~307.3466 0.00 M3 0.00 10,301,000.00 29,~~715~~804.5223 0.00 M4 0.00 12,361,000.00 46,~~302~~408.2569 0.00 M5 0.00 7,004,000.00 27,~~743~~803.6293 0.00 B 0.00 7,416,000.00 29,~~375~~439.6046 0.00 X 0.00 5,769,270.40 1,~~962~~901,~~017~~193.9236 0.00 P 0.00 100.00 ~~100~~189,~~781~~991.4325 0.00 R 0.00 0.00 0.00 0.00 Totals 0.00 ~~797~~779,~~571~~060,~~854~~412.7100 1623,~~461~~139,~~549~~949.7460 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 ~~240~~234,~~229~~144,~~933~~925.3323 0.00 68,~~085~~648,~~008~~493.1001 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 ~~151~~145,~~525~~757,~~741~~559.8108 0.00 59,~~768~~862,~~182~~949.7370 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 ~~809~~797,~~425~~571,~~045~~854.5471 0.00 1118,~~853~~511,~~190~~442.8371 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 68,~~085~~648,~~008~~493.1001 ~~234~~225,~~144~~496,~~925~~432.2322 0.~~94891945~~91386969 68,~~085~~648,~~008~~493.1001 1-A2 0.00 183,309,000.00 1.00000000 0.00 2-A1 59,~~768~~862,~~182~~949.7370 ~~145~~135,~~757~~894,~~559~~609.0838 0.~~91309056~~85130463 59,~~768~~862,~~182~~949.7370 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 1118,~~853~~511,~~190~~442.8371 ~~797~~779,~~571~~060,~~854~~412.7100 0.~~96786902~~94540502 1118,~~853~~511,~~190~~442.8371

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 ~~973~~948.~~58016985~~91944944 0.00000000 2435.~~66072041~~04975911 0.00000000 1-A2 183,309,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 2-A1 159,631,000.00 ~~949~~913.~~22503655~~09055935 0.00000000 3661.~~13447720~~78592942 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 2435.~~66072041~~04975911 ~~948~~913.~~91944944~~86969033 0.~~94891945~~91386969 2435.~~66072041~~04975911 1-A2 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 2-A1 0.00000000 3661.~~13447720~~78592942 ~~913~~851.~~09055935~~30462993 0.~~91309056~~85130463 3661.~~13447720~~78592942 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, 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.~~22000~~23000% ~~240~~234,~~229~~144,~~933~~925.3323 ~~252~~247,~~374~~998.8950 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.~~22000~~23000% ~~151~~145,~~525~~757,~~741~~559.8108 ~~159~~154,~~186~~381.2155 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.~~90000~~91000% 35,434,000.00 5758,~~973~~279.9609 0.00 0.00 M2 37,082,000.00 3.~~10000~~11000% 37,082,000.00 9899,~~988~~307.3466 0.00 0.00 M3 10,301,000.00 3.~~35000~~36000% 10,301,000.00 29,~~715~~804.5223 0.00 0.00 M4 12,361,000.00 4.~~35000~~36000% 12,361,000.00 46,~~302~~408.2569 0.00 0.00 M5 7,004,000.00 4.~~60000~~61000% 7,004,000.00 27,~~743~~803.6293 0.00 0.00 B 7,416,000.00 4.~~60000~~61000% 7,416,000.00 29,~~375~~439.6046 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,~~545~~537,~~559~~322.5628 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 ~~252~~247,~~374~~998.8950 0.00 ~~234~~225,~~144~~496,~~925~~432.2322 1-A2 0.00 0.00 294,821.98 0.00 183,309,000.00 2-A1 0.00 0.00 ~~159~~154,~~186~~381.2155 0.00 ~~145~~135,~~757~~894,~~559~~609.0838 2-A2 0.00 0.00 189,397.19 0.00 118,993,000.00 A-IO 0.00 0.00 1,359,680.00 0.00 271,936,000.00 M1 0.00 0.00 5758,~~973~~279.9609 0.00 35,434,000.00 M2 0.00 0.00 9899,~~988~~307.3466 0.00 37,082,000.00 M3 0.00 0.00 29,~~715~~804.5223 0.00 10,301,000.00 M4 0.00 0.00 46,~~302~~408.2569 0.00 12,361,000.00 M5 0.00 0.00 27,~~743~~803.6293 0.00 7,004,000.00 B 0.00 0.00 29,~~375~~439.6046 0.00 7,416,000.00 X 0.00 0.00 1,~~962~~901,~~017~~193.9236 0.00 5,769,270.40 P 0.00 0.00 ~~100~~189,~~781~~991.4325 0.00 100.00 R 0.00 0.00 0.00 0.00 0.00 Totals 0.00 0.00 4,~~608~~628,~~358~~506.9189 0.00 (4) Amount Does Not Include Excess Special Hazard, Bankrupcy, 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.~~22000~~23000% ~~973~~948.~~58016985~~91944944 1.~~02280005~~00506385 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.~~22000~~23000% ~~949~~913.~~22503655~~09055935 0.~~99721364~~96711510 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.~~90000~~91000% 1000.00000000 1.~~63611108~~64472230 0.00000000 0.00000000 M2 37,082,000.00 3.~~10000~~11000% 1000.00000000 2.~~66944447~~67805566 0.00000000 0.00000000 M3 10,301,000.00 3.~~35000~~36000% 1000.00000000 2.~~88472187~~89333366 0.00000000 0.00000000 M4 12,361,000.00 4.~~35000~~36000% 1000.00000000 3.~~74583367~~75444462 0.00000000 0.00000000 M5 7,004,000.00 4.~~60000~~61000% 1000.00000000 3.~~96111079~~96972159 0.00000000 0.00000000 B 7,416,000.00 4.~~60000~~61000% 1000.00000000 3.~~96111111~~96972222 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.~~02280005~~00506385 0.00000000 ~~948~~913.~~91944944~~86969033 1-A2 0.00000000 0.00000000 1.60833336 0.00000000 1000.00000000 2-A1 0.00000000 0.00000000 0.~~99721364~~96711510 0.00000000 ~~913~~851.~~09055935~~30462993 2-A2 0.00000000 0.00000000 1.59166665 0.00000000 1000.00000000 A-IO 0.00000000 0.00000000 5.00000000 0.00000000 1000.00000000 M1 0.00000000 0.00000000 1.~~63611108~~64472230 0.00000000 1000.00000000 M2 0.00000000 0.00000000 2.~~66944447~~67805566 0.00000000 1000.00000000 M3 0.00000000 0.00000000 2.~~88472187~~89333366 0.00000000 1000.00000000 M4 0.00000000 0.00000000 3.~~74583367~~75444462 0.00000000 1000.00000000 M5 0.00000000 0.00000000 3.~~96111079~~96972159 0.00000000 1000.00000000 B 0.00000000 0.00000000 3.~~96111111~~96972222 0.00000000 1000.00000000 X 0.00000000 0.00000000 ~~340~~329.~~08077001~~53791869 0.00000000 1000.00000000 P 0.00000000 0.00000000 ~~1007814~~1899912.~~30000000~~50000000 0.00000000 1000.00000000 R 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 (6) Amount Does Not Include Excess Special Hazard, Bankrupcy,or Fraud Losses Unless Otherwise Disclosed. Please Refer to the Prospectus Supplement for a Full Description.

CERTIFICATEHOLDER ACCOUNT STATEMENT CERTIFICATE ACCOUNT Beginning Balance 0.00 Deposits Payments of Interest and Principal 1723,~~263~~930,~~573~~506.33 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 1723,~~263~~930,~~573~~506.33 Withdrawals Reimbursement for Servicer Advances 0.00 Payment of Service Fee ~~802~~790,~~023~~556.5973 Payment of Interest and Principal 1623,~~461~~139,~~549~~949.7460 Total Withdrawals (Pool Distribution Amount) 1723,~~263~~930,~~573~~506.33 Ending Balance 0.00

SERVICING FEES Gross Servicing Fee ~~337~~332,~~260~~321.9456 Credit Risk Manager's Fee 109,~~117~~969.8165 PMI Insurance Premium Fee ~~452~~445,~~284~~939.0955 Securities Administration Fee (LEO TEST) 0.00 Wells Fargo Bank Minnesota, NA 2,~~360~~325.7597 Supported Prepayment/Curtailment Interest Shortfall 0.00 Net Servicing Fee ~~802~~790,~~023~~556.5973

OTHER ACCOUNTS Beginning Current Current Ending Account Type Balance Withdrawals Deposits Balance Reserve Fund 1,000.00 0.0045 0.0045 1,000.00 Financial Guaranty 0.00 0.4700 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 36 0 0 36 ~~248~~741,~~076~~073.6905 0.00 0.00 ~~248~~741,~~076~~073.6905 30 Days 7865 1 0 0 7966 1210,~~678~~919,~~190~~488.5141 30203,~~141~~698.9561 0.00 0.00 1211,~~708~~123,~~332~~187.4602 60 Days 2919 01 813 0 3733 42,~~717~~221,~~470~~348.0271 030,141.0095 12,~~777~~625,~~291~~078.5508 0.00 64,~~494~~876,~~761~~568.5774 90 Days 75 01 2317 0 3023 1502,~~348,589~~063.2863 0103,500.00 3,~~681~~572,~~346~~293.2681 0.00 54,~~029~~177,~~935~~857.5444 120 Days 1 2 024 6 0 827 ~~143~~25,~~909~~846.5491 0394,805.0083 ~~635~~4,~~288~~258,722.8410 0.00 ~~779~~4,~~198~~679,374.3884 150 Days 02 0 06 0 08 0143,909.0054 0.00 0635,288.0084 0.00 0779,198.0038 180+ Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 Totals ~~116~~92 411 3760 0 ~~157~~163 1813,~~888~~812,~~159~~657.3520 ~~278~~1,~~218~~473,219.6444 611,~~093~~091,~~926~~382.6583 0.00 2526,~~260~~377,~~304~~259.6447 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.~~063304~~128977% 0.000000% 0.000000% 0.~~063304~~128977% 0.~~031082~~095052% 0.000000% 0.000000% 0.~~031082~~095052% 30 Days 1.~~645917~~397248% 0.~~021101~~021496% 0.000000% 0.000000% 1.~~667018~~418745% 1.~~588493~~400569% 0.~~003777~~026127% 0.000000% 0.000000% 1.~~592269~~426696% 60 Days 0.~~611943~~408426% 0.~~000000~~021496% 0.~~168812~~279450% 0.000000% 0.~~780755~~709372% 0.~~591068~~284917% 0.~~000000~~003866% 0.~~222683~~336701% 0.000000% 0.~~813750~~625485% 90 Days 0.~~147710~~107481% 0.~~000000~~021496% 0.~~485334~~365434% 0.000000% 0.~~633045~~494411% 0.~~168969~~064396% 0.~~000000~~013275% 0.~~461248~~458194% 0.000000% 0.~~630217~~535866% 120 Days 0.~~042203~~021496% 0.~~000000~~042992% 0.~~126609~~515907% 0.000000% 0.~~168812~~580396% 0.~~018031~~003315% 0.~~000000~~050639% 0.~~079597~~546238% 0.000000% 0.~~097628~~600192% 150 Days 0.~~000000~~042992% 0.000000% 0.~~000000~~128977% 0.000000% 0.~~000000~~171969% 0.~~000000~~018458% 0.000000% 0.~~000000~~081484% 0.000000% 0.~~000000~~099943% 180+ Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% Totals 21.~~447774~~977644% 0.~~084406~~236457% 01.~~780755~~289768% 0.000000% 3.~~312935~~503869% 21.~~366561~~771656% 0.~~034859~~188960% 01.~~763528~~422617% 0.000000% 3.~~164948~~383233%

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 02 0 0 02 0247,142.0024 0.00 0.00 0247,142.0024 30 Days 92 0 0 0 92 ~~992~~490,~~540~~932.9849 0.00 0.00 0.00 ~~992~~490,~~540~~932.9849 60 Days 32 0 2 0 54 ~~353~~150,~~163~~604.9055 0.00 88492,~~000~~197.0015 0.00 ~~441~~642,~~163~~801.9070 90 Days 01 0 13 0 14 061,937.0001 0.00 ~~109~~352,~~500~~834.0044 0.00 ~~109~~414,~~500~~771.0045 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 125 02 35 0 1512 1703,~~345,704~~474.8805 0247,142.0024 ~~197~~845,~~500~~031.0059 0.00 1,~~543~~795,~~204~~647.88 0-29 Days 0.~~000000~~249066% 0.000000% 0.000000% 0.~~000000~~249066% 0.~~000000~~198517% 0.000000% 0.000000% 0.~~000000~~198517% 30 Days 10.~~108374~~249066% 0.000000% 0.000000% 0.000000% 10.~~108374~~249066% 0.~~787015~~394341% 0.000000% 0.000000% 0.000000% 0.~~787015~~394341% 60 Days 0.~~369458~~249066% 0.000000% 0.~~246305~~249066% 0.000000% 0.~~615764~~498132% 0.~~280034~~120973% 0.000000% 0.~~069778~~395356% 0.000000% 0.~~349812~~516329% 90 Days 0.~~000000~~124533% 0.000000% 0.~~123153~~373599% 0.000000% 0.~~123153~~498132% 0.~~000000~~049751% 0.000000% 0.~~086826~~283414% 0.000000% 0.~~086826~~333164% 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 10.~~477833~~622665% 0.~~000000~~249066% 0.~~369458~~622665% 0.000000% 1.~~847291~~494396% 10.~~067049~~565064% 0.~~000000~~198517% 0.~~156603~~678770% 0.000000% 1.~~223652~~442351% 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 2 0 0 2 173,~~338~~232.1599 0.00 0.00 173,~~338~~232.1599 30 Days 3629 1 0 0 3730 54,~~981~~593,~~290~~275.5831 30203,~~141~~698.9561 0.00 0.00 64,~~011~~796,~~432~~973.5392 60 Days 89 0 1 5 0 915 1,~~184~~435,~~982~~367.2551 030,141.0095 ~~103~~727,~~500~~533.0050 0.00 12,~~288~~193,~~482~~042.2596 90 Days 21 01 54 0 76 ~~404~~62,~~826~~331.3356 0103,500.00 1511,~~044,600~~760.0038 0.00 1677,~~449,426~~591.3394 120 Days 0 01 06 0 07 0.00 0304,000.00 01,145,426.0033 0.00 01,449,426.0033 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 4639 3 6 15 0 5560 76,~~571~~090,~~099~~974.1638 ~~203~~814,~~480~~573.1055 12,~~148~~384,~~100~~720.0021 0.00 89,~~922~~290,~~679~~268.2614 0-29 Days 0.~~093284~~094832% 0.000000% 0.000000% 0.~~093284~~094832% 0.~~047926~~048844% 0.000000% 0.000000% 0.~~047926~~048844% 30 Days 1.~~679104~~375059% 0.~~046642~~047416% 0.000000% 0.000000% 1.~~725746~~422475% 1.~~653749~~295087% 0.~~008334~~057433% 0.000000% 0.000000% 1.~~662083~~352520% 60 Days 0.~~373134~~426743% 0.~~000000~~047416% 0.~~046642~~237079% 0.000000% 0.~~419776~~711238% 0.~~327632~~404706% 0.~~000000~~008499% 0.~~028616~~205130% 0.000000% 0.~~356249~~618335% 90 Days 0.~~093284~~047416% 0.~~000000~~047416% 0.~~233209~~189663% 0.000000% 0.~~326493~~284495% 0.~~111929~~017575% 0.~~000000~~029182% 0.~~288818~~144292% 0.000000% 0.~~400747~~191049% 120 Days 0.000000% 0.~~000000~~047416% 0.~~000000~~284495% 0.000000% 0.~~000000~~331911% 0.000000% 0.~~000000~~085714% 0.~~000000~~322956% 0.000000% 0.~~000000~~408670% 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 21.~~145522~~849218% 0.~~139925~~284495% 0.~~279851~~711238% 0.000000% 2.~~565299~~844950% 21.~~093310~~717367% 0.~~056260~~229671% 0.~~317435~~672379% 0.000000% 2.~~467004~~619417% 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 01 0 0 01 0246,001.0041 0.00 0.00 0246,001.0041 30 Days 9 0 0 0 9 1,~~062~~355,~~104~~920.3276 0.00 0.00 0.00 1,~~062~~355,~~104~~920.3276 60 Days 64 0 0 0 64 ~~492~~222,~~199~~626.4146 0.00 0.00 0.00 ~~492~~222,~~199~~626.4146 90 Days 31 0 51 0 82 ~~721~~30,~~117~~433.9579 0.00 ~~914~~245,~~812~~854.2242 0.00 1276,~~635,930~~288.1721 120 Days 21 0 07 0 28 ~~143~~25,~~909~~846.5491 0.00 01,610,083.0026 0.00 ~~143~~1,~~909~~635,930.5417 150 Days 02 0 0 0 02 0143,909.0054 0.00 0.00 0.00 0143,909.0054 180 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 Totals 2017 01 58 0 2526 21,~~419~~778,~~331~~737.2246 0246,001.0041 ~~914~~1,~~812~~855,937.2268 0.00 3,~~334~~880,~~143~~676.4455 0-29 Days 0.~~000000~~157978% 0.000000% 0.000000% 0.~~000000~~157978% 0.~~000000~~316061% 0.000000% 0.000000% 0.~~000000~~316061% 30 Days 1.~~380368~~421801% 0.000000% 0.000000% 0.000000% 1.~~380368~~421801% 1.~~296832~~742078% 0.000000% 0.000000% 0.000000% 1.~~296832~~742078% 60 Days 0.~~920245~~631912% 0.000000% 0.000000% 0.000000% 0.~~920245~~631912% 0.~~600977~~286029% 0.000000% 0.000000% 0.000000% 0.~~600977~~286029% 90 Days 0.~~460123~~157978% 0.000000% 0.~~766871~~157978% 0.000000% 10.~~226994~~315956% 0.~~880487~~039101% 0.000000% 10.~~116988~~315872% 0.000000% 10.~~997475~~354973% 120 Days 0.~~306748~~157978% 0.000000% 01.~~000000~~105845% 0.000000% 01.~~306748~~263823% 0.~~175714~~033208% 0.000000% 02.~~000000~~068624% 0.000000% 02.~~175714~~101832% 150 Days 0.~~000000~~315956% 0.000000% 0.000000% 0.000000% 0.~~000000~~315956% 0.~~000000~~184894% 0.000000% 0.000000% 0.000000% 0.~~000000~~184894% 180 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% Totals 32.~~067485~~685624% 0.~~000000~~157978% 01.~~766871~~263823% 0.000000% 34.~~834356~~107425% 2.~~954010~~285310% 0.~~000000~~316061% 12.~~116988~~384496% 0.000000% 4.~~070998~~985867% 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 1 0 0 1 74,~~738~~696.5441 0.00 0.00 74,~~738~~696.5441 30 Days 2425 0 0 0 2425 4,~~642~~479,~~254~~359.6385 0.00 0.00 0.00 4,~~642~~479,~~254~~359.6385 60 Days 124 0 56 0 1710 2412,~~687,124~~750.4619 0.00 1,~~585~~405,~~791~~347.5543 0.00 41,~~272~~818,~~916~~097.0162 90 Days 2 0 129 0 1411 ~~222~~347,~~645~~361.0027 0.00 12,~~612~~461,~~434~~844.0457 0.00 12,~~835~~809,~~079~~205.0484 120 Days 0 01 611 0 612 0.00 090,805.0083 ~~635~~1,~~288~~503,212.8451 0.00 ~~635~~1,~~288~~594,018.8434 150 Days 0 0 06 0 06 0.00 0.00 0635,288.0084 0.00 0635,288.0084 180 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 Totals 3831 12 2332 0 6265 75,~~552~~239,~~024~~471.0931 74165,~~738~~502.5424 36,~~833~~005,~~514~~693.4335 0.00 11,~~460~~410,~~277~~666.0690 0-29 Days 0.~~088417~~090334% 0.000000% 0.000000% 0.~~088417~~090334% 0.~~032718~~033549% 0.000000% 0.000000% 0.~~032718~~033549% 30 Days 2.~~122016~~258356% 0.000000% 0.000000% 0.000000% 2.~~122016~~258356% 2.~~032229~~011847% 0.000000% 0.000000% 0.000000% 2.~~032229~~011847% 60 Days 10.~~061008~~361337% 0.000000% 0.~~442087~~542005% 0.000000% 10.~~503095~~903342% 10.~~176336~~185381% 0.000000% 0.~~694208~~631194% 0.000000% 10.~~870544~~816575% 90 Days 0.~~176835~~180668% 0.000000% 10.~~061008~~813008% 0.000000% 10.~~237843~~993677% 0.~~097467~~156013% 0.000000% 01.~~705871~~105706% 0.000000% 01.~~803338~~261719% 120 Days 0.000000% 0.~~000000~~090334% 0.~~530504~~993677% 0.000000% 01.~~530504~~084011% 0.000000% 0.~~000000~~040784% 0.~~278109~~675149% 0.000000% 0.~~278109~~715933% 150 Days 0.000000% 0.000000% 0.~~000000~~542005% 0.000000% 0.~~000000~~542005% 0.000000% 0.000000% 0.~~000000~~285332% 0.000000% 0.~~000000~~285332% 180 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% Totals 32.~~359859~~800361% 0.~~088417~~180668% 2.~~033599~~890696% 0.000000% 5.~~481874~~871725% 32.~~306032~~353241% 0.~~032718~~074333% 12.~~678189~~697380% 0.000000% 5.~~016939~~124955%

COLLATERAL STATEMENT Collateral Description Mixed Fixed & Arm Weighted Average Gross Coupon 7.~~871663~~867622% Weighted Average Net Coupon 7.~~371663~~367622% Weighted Average Pass-Through Rate 6.~~697636~~693176% Weighted Average Maturity(Stepdown Calculation ) ~~352~~351 Beginning Scheduled Collateral Loan Count 4,~~800~~739 Number Of Loans Paid In Full 6187 Ending Scheduled Collateral Loan Count 4,~~739~~652 Beginning Scheduled Collateral Balance ~~809~~797,~~424~~571,~~945~~754.5471 Ending Scheduled Collateral Balance ~~797~~779,~~571~~060,~~754~~312.7100 Ending Actual Collateral Balance at 31-~~Jul~~Aug-2003 ~~798~~779,~~127~~646,~~004~~477.1668 Monthly P &I Constant 5,~~927~~843,~~249~~102.8119 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 ~~797~~779,~~571~~060,~~754~~312.7100 Scheduled Principal ~~617~~613,~~649~~941.7011 Unscheduled Principal 1117,~~235~~897,~~541~~501.1360

Miscellaneous Reporting Excess Cash Amount 1,~~962~~901,~~017~~192.4591 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.~~787900~~785696 7.~~675213~~670530 8.~~741890~~744460 Weighted Average Net Rate 7.~~287900~~285696 7.~~175213~~170530 8.~~241890~~244459 Weighted Average Maturity ~~352~~351 ~~352~~351 ~~349~~348 Beginning Loan Count ~~821~~812 2,~~167~~144 ~~660~~652 Loans Paid In Full 9 2335 819 Ending Loan Count ~~812~~803 2,~~144~~109 ~~652~~633 Beginning Scheduled Balance ~~127~~126,~~730~~028,~~105~~036.0590 ~~365~~361,~~818~~435,~~441~~501.6772 8381,~~193~~841,~~630~~562.9856 Ending scheduled Balance ~~126~~124,~~028~~403,~~036~~600.9012 ~~361~~354,~~435~~411,~~501~~445.7249 8177,~~841~~772,~~562~~186.5664 Record Date 0708/31/2003 0708/31/2003 0708/31/2003 Principal And Interest Constant ~~938~~927,~~964~~293.5013 2,~~614~~583,~~318~~816.8205 ~~670~~660,~~187~~089.8154 Scheduled Principal ~~110~~109,~~006~~613.7614 ~~274~~273,~~540~~481.1027 6463,~~129~~706.8501 Unscheduled Principal 1,~~592~~514,~~061~~823.3964 46,~~108~~750,~~399~~574.8596 14,~~287~~005,~~938~~669.5791 Scheduled Interest ~~828~~817,~~957~~679.7499 2,~~339~~310,~~778~~334.7278 ~~606~~596,~~057~~383.9653 Servicing Fees 5352,~~220~~511.8866 ~~152~~150,~~424~~598.3809 34,~~664~~100.0267 Master Servicing Fees 0.00 0.00 0.00 Trustee Fee ~~372~~367.5256 1,~~066~~054.9924 ~~242~~238.6068 FRY Amount 0.00 0.00 0.00 Special Hazard Fee 0.00 0.00 0.00 Other Fee 47,~~700~~328.9751 ~~264~~261,~~138~~038.5285 2726,~~232~~365.5282 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 ~~727~~717,~~663~~472.3726 1,~~922~~897,~~148~~643.8360 ~~543~~535,~~918~~678.8236 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.~~836258~~831549 6.~~305255~~300356 7.~~845583~~854372

Group Level Collateral Statement Group 2(B) Total Collateral Description Fixed 15/30 & ARM Mixed Fixed & Arm Weighted Average Coupon Rate 7.~~915356~~910552 7.~~871663~~867622 Weighted Average Net Rate 7.~~415355~~410552 7.~~371663~~367622 Weighted Average Maturity ~~349~~348 ~~352~~351 Beginning Loan Count 1,~~152~~131 4,~~800~~739 Loans Paid In Full 2124 6187 Ending Loan Count 1,~~131~~107 4,~~739~~652 Beginning Scheduled Balance ~~232~~228,~~682~~266,~~767~~653.8453 ~~809~~797,~~424~~571,~~945~~754.5471 Ending scheduled Balance ~~228~~222,~~266~~473,~~653~~079.5375 ~~797~~779,~~571~~060,~~754~~312.7100 Record Date 0708/31/2003 0708/31/2003 Principal And Interest Constant 1,~~703~~671,~~778~~903.6847 5,~~927~~843,~~249~~102.8119 Scheduled Principal ~~168~~167,~~972~~140.9969 ~~617~~613,~~649~~941.7011 Unscheduled Principal 45,~~247~~626,~~141~~433.3209 1117,~~235~~897,~~541~~501.1360 Scheduled Interest 1,~~534~~504,~~805~~762.6978 5,~~309~~229,~~600~~161.1108 Servicing Fees 9695,~~951~~111.1613 ~~337~~332,~~260~~321.4455 Master Servicing Fees 0.00 0.00 Trustee Fee ~~678~~665.6776 2,~~360~~326.7824 FRY Amount 0.00 0.00 Special Hazard Fee 0.00 0.00 Other Fee ~~113~~111,~~212~~206.0433 ~~452~~445,~~284~~939.0551 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,~~323~~297,~~963~~779.8256 4,~~517~~448,~~694~~573.8478 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.~~827994~~822440 6.~~697636~~693176

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