8-K 1 sai03bc4.txt NOVEMBER 8-K UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D. C. 20549 Form 8-K Current Report Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): November 25, 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 November 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 November 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 as Assistant Vice President By: Beth Belfield as Assistant Vice President Date: 11/24/03 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 November 25, 2003 distribution. EX-99.1

Structured Asset Investment Loan Trust Mortgage Pass-Through Certificates Record Date: 910/3031/03 Distribution Date: 1011/2725/03 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% ~~225~~216,~~496~~749,~~432~~046.2210 ~~248~~216,~~547~~508.1721 814,~~747~~827,~~386~~936.1208 1-A2 86358EBG0 SEN 1.93000% 183,309,000.00 294,821.97 0.00 2-A1 86358EBH8 SEN 1.24000% ~~135~~127,~~894~~662,~~609~~571.3869 ~~149~~127,~~786~~520.0672 8,~~232~~582,~~037~~698.6927 2-A2 86358EBJ4 SEN 1.91000% 118,993,000.00 189,397.19 0.00 A-IO 86358EBK1 IO 6.00000% 0.00 1,359,679.98 0.00 M1 86358EBL9 MEZ 1.92000% 35,434,000.00 6054,~~474~~804.0359 0.00 M2 86358EBM7 MEZ 3.12000% 37,082,000.00 ~~102~~93,~~840~~199.7543 0.00 M3 86358EBN5 MEZ 3.37000% 10,301,000.00 3027,~~857~~964.2235 0.00 M4 86358EBP0 MEZ 4.37000% 12,361,000.00 4843,~~015~~514.6215 0.00 M5 86358EBQ8 MEZ 4.62000% 7,004,000.00 2826,~~763~~066.0955 0.00 B 86358EBR6 SEN 4.62000% 7,416,000.00 3027,~~455~~599.0488 0.00 X SAI03BC4X SEN 0.00000% 5,769,270.40 1,~~786~~722,~~250~~719.1681 0.00 P SAI03BC4P SEN 0.00000% 100.00 ~~232~~305,~~880~~044.0914 0.00 R SAI03B4R3 SEN 0.00000% 0.00 0.00 0.00 Totals ~~779~~762,~~060~~080,~~412~~988.0019 4,~~562~~488,~~768~~840.3797 1623,~~979~~410,~~423~~634.8135

Certificateholder Distribution Summary (continued) Current Ending Cumulative Realized Certificate Total Realized Class Loss Balance Distribution Losses 1-A1 0.00 ~~216~~201,~~749~~921,~~046~~110.1003 815,~~995~~044,~~933~~444.29 0.00 1-A2 0.00 183,309,000.00 294,821.97 0.00 2-A1 0.00 ~~127~~119,~~662~~079,~~571~~873.6941 8,~~381~~710,~~823~~218.7599 0.00 2-A2 0.00 118,993,000.00 189,397.19 0.00 A-IO 0.00 0.00 1,359,679.98 0.00 M1 0.00 35,434,000.00 6054,~~474~~804.0359 0.00 M2 0.00 37,082,000.00 ~~102~~93,~~840~~199.7543 0.00 M3 0.00 10,301,000.00 3027,~~857~~964.2235 0.00 M4 0.00 12,361,000.00 4843,~~015~~514.6215 0.00 M5 0.00 7,004,000.00 2826,~~763~~066.0955 0.00 B 0.00 7,416,000.00 3027,~~455~~599.0488 0.00 X 0.00 5,769,270.40 1,~~786~~722,~~250~~719.1681 0.00 P 0.00 100.00 ~~232~~305,~~880~~044.0914 0.00 R 0.00 0.00 0.00 0.00 Totals 0.00 ~~762~~738,~~080~~670,~~988~~353.1984 2127,~~542~~899,~~192~~475.1832 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 ~~225~~216,~~496~~749,~~432~~046.2210 0.00 814,~~747~~827,~~386~~936.1208 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 ~~135~~127,~~894~~662,~~609~~571.3869 0.00 8,~~232~~582,~~037~~698.6927 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 ~~779~~762,~~060~~080,~~412~~988.0019 0.00 1623,~~979~~410,~~423~~634.8135 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 814,~~747~~827,~~386~~936.1208 ~~216~~201,~~749~~921,~~046~~110.1003 0.~~87841915~~81832595 814,~~747~~827,~~386~~936.1208 1-A2 0.00 183,309,000.00 1.00000000 0.00 2-A1 8,~~232~~582,~~037~~698.6927 ~~127~~119,~~662~~079,~~571~~873.6941 0.~~79973546~~74596960 8,~~232~~582,~~037~~698.6927 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 1623,~~979~~410,~~423~~634.8135 ~~762~~738,~~080~~670,~~988~~353.1984 0.~~92480016~~89639090 1623,~~979~~410,~~423~~634.8135

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 ~~913~~878.~~86969033~~41914699 0.00000000 3560.~~45054335~~09319624 0.00000000 1-A2 183,309,000.00 1000.00000000 0.00000000 0.00000000 0.00000000 2-A1 159,631,000.00 ~~851~~799.~~30462993~~73546297 0.00000000 5153.~~56916695~~76586171 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 3560.~~45054335~~09319624 ~~878~~818.~~41914699~~32595078 0.~~87841915~~81832595 3560.~~45054335~~09319624 1-A2 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 2-A1 0.00000000 5153.~~56916695~~76586171 ~~799~~745.~~73546297~~96960121 0.~~79973546~~74596960 5153.~~56916695~~76586171 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% ~~225~~216,~~496~~749,~~432~~046.2210 ~~248~~216,~~547~~508.1821 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% ~~135~~127,~~894~~662,~~609~~571.3869 ~~149~~127,~~786~~520.0672 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 1.92000% 35,434,000.00 6054,~~474~~804.0359 0.00 0.00 M2 37,082,000.00 3.12000% 37,082,000.00 ~~102~~93,~~840~~199.7543 0.00 0.00 M3 10,301,000.00 3.37000% 10,301,000.00 3027,~~857~~964.2235 0.00 0.00 M4 12,361,000.00 4.37000% 12,361,000.00 4843,~~015~~514.6215 0.00 0.00 M5 7,004,000.00 4.62000% 7,004,000.00 2826,~~763~~066.0955 0.00 0.00 B 7,416,000.00 4.62000% 7,416,000.00 3027,~~455~~599.0488 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,~~543~~461,~~638~~077.1605 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 ~~248~~216,~~547~~508.1721 0.00 ~~216~~201,~~749~~921,~~046~~110.1003 1-A2 0.00 0.00 294,821.97 0.00 183,309,000.00 2-A1 0.00 0.00 ~~149~~127,~~786~~520.0672 0.00 ~~127~~119,~~662~~079,~~571~~873.6941 2-A2 0.00 0.00 189,397.19 0.00 118,993,000.00 A-IO 0.00 0.00 1,359,679.98 0.00 ~~271~~222,~~936~~493,000.00 M1 0.00 0.00 6054,~~474~~804.0359 0.00 35,434,000.00 M2 0.00 0.00 ~~102~~93,~~840~~199.7543 0.00 37,082,000.00 M3 0.00 0.00 3027,~~857~~964.2235 0.00 10,301,000.00 M4 0.00 0.00 4843,~~015~~514.6215 0.00 12,361,000.00 M5 0.00 0.00 2826,~~763~~066.0955 0.00 7,004,000.00 B 0.00 0.00 3027,~~455~~599.0488 0.00 7,416,000.00 X 0.00 0.00 1,~~786~~722,~~250~~719.1681 0.00 5,769,270.40 P 0.00 0.00 ~~232~~305,~~880~~044.0914 0.00 100.00 R 0.00 0.00 0.00 0.00 0.00 Totals 0.00 0.00 4,~~562~~488,~~768~~840.3797 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% ~~913~~878.~~86969033~~41914699 10.~~00728749~~87744311 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% ~~851~~799.~~30462993~~73546297 0.~~93832689~~79884684 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 1.92000% 1000.00000000 1.~~70666676~~54666676 0.00000000 0.00000000 M2 37,082,000.00 3.12000% 1000.00000000 2.~~77333342~~51333342 0.00000000 0.00000000 M3 10,301,000.00 3.37000% 1000.00000000 2.~~99555577~~71472187 0.00000000 0.00000000 M4 12,361,000.00 4.37000% 1000.00000000 3.~~88444462~~52027749 0.00000000 0.00000000 M5 7,004,000.00 4.62000% 1000.00000000 43.~~10666619~~72166619 0.00000000 0.00000000 B 7,416,000.00 4.62000% 1000.00000000 43.~~10666667~~72166667 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 10.~~00728745~~87744311 0.00000000 ~~878~~818.~~41914699~~32595078 1-A2 0.00000000 0.00000000 1.60833331 0.00000000 1000.00000000 2-A1 0.00000000 0.00000000 0.~~93832689~~79884684 0.00000000 ~~799~~745.~~73546297~~96960121 2-A2 0.00000000 0.00000000 1.59166665 0.00000000 1000.00000000 A-IO 0.00000000 0.00000000 4.99999993 0.00000000 ~~1000~~818.~~00000000~~18148388 M1 0.00000000 0.00000000 1.~~70666676~~54666676 0.00000000 1000.00000000 M2 0.00000000 0.00000000 2.~~77333342~~51333342 0.00000000 1000.00000000 M3 0.00000000 0.00000000 2.~~99555577~~71472187 0.00000000 1000.00000000 M4 0.00000000 0.00000000 3.~~88444462~~52027749 0.00000000 1000.00000000 M5 0.00000000 0.00000000 43.~~10666619~~72166619 0.00000000 1000.00000000 B 0.00000000 0.00000000 43.~~10666667~~72166667 0.00000000 1000.00000000 X 0.00000000 0.00000000 ~~309~~298.~~61456755~~60271587 0.00000000 1000.00000000 P 0.00000000 0.00000000 ~~2328800~~3050441.~~90000000~~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 2228,~~316~~707,~~351~~106.8050 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(48,359.0067) Prepayment Penalties 0.00 Total Deposits 2228,~~316~~658,~~351~~746.8083 Withdrawals Reimbursement for Servicer Advances 0.00 Payment of Service Fee ~~774~~759,~~159~~271.6251 Payment of Interest and Principal 2127,~~542~~899,~~192~~475.1832 Total Withdrawals (Pool Distribution Amount) 2228,~~316~~658,~~351~~746.8083 Ending Balance 0.00

SERVICING FEES Gross Servicing Fee ~~324~~317,~~608~~533.4055 Credit Risk Manager's Fee 9,~~738~~526.2501 PMI Insurance Premium Fee ~~437~~429,~~540~~989.9044 ~~Securities Administration Fee (LEO TEST) 0.00~~ Wells Fargo Bank Minnesota, NA 2,~~272~~222.0751 Supported Prepayment/Curtailment Interest Shortfall 0.00 Net Servicing Fee ~~774~~759,~~159~~271.6251

OTHER ACCOUNTS Beginning Current Current Ending Account Type Balance Withdrawals Deposits Balance Reserve Fund 1,000.00 02,643.4472 02,643.4472 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 710 0 0 710 ~~765~~1,~~390~~283,377.2549 0.00 0.00 ~~765~~1,~~390~~283,377.2549 30 Days 9695 32 0 0 9997 1416,~~974~~353,~~221~~235.2197 ~~404~~115,~~867~~456.4743 0.00 0.00 1516,~~379~~468,~~088~~692.6840 60 Days 1725 23 2030 0 3958 23,~~229~~454,~~089~~840.7997 ~~321~~184,~~570~~460.6476 35,~~386~~288,~~435~~150.8928 0.00 58,~~937~~927,~~096~~452.3201 90 Days 1113 01 1517 0 2631 1,~~300~~856,~~390~~881.6598 0203,698.0061 2,~~610~~633,~~518~~018.3063 0.00 34,~~910~~693,~~908~~599.9522 120 Days 27 21 1514 0 1922 72775,~~738~~686.2429 ~~145~~103,~~766~~465.5967 31,~~390~~997,~~405~~958.3379 0.00 32,~~608~~877,~~910~~110.1675 150 Days 2 1 413 20 1 2617 2572,~~846~~738.9124 ~~879~~42,~~755~~266.1559 32,~~566~~762,~~786~~990.2115 56232,~~986~~606.5701 43,~~529~~110,~~374~~600.8499 180+ Days 13 02 621 05 731 84428,~~928~~966.4029 0140,755.0015 ~~604~~2,~~254~~872,193.9848 01,179,442.0096 ~~689~~4,~~183~~621,357.3888 Totals ~~128~~145 1820 7695 16 ~~223~~266 1822,~~687~~942,~~215~~349.2074 2,~~517~~073,~~350~~480.1070 1315,~~558~~554,~~400~~311.7133 561,~~986~~412,048.5797 3441,~~819~~982,~~952~~190.5874 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.~~153374~~225124% 0.000000% 0.000000% 0.~~153374~~225124% 0.~~100355~~173601% 0.000000% 0.000000% 0.~~100355~~173601% 30 Days 2.~~103418~~138676% 0.~~065732~~045025% 0.000000% 0.000000% 2.~~169150~~183701% 12.~~963370~~212088% 0.~~053085~~015618% 0.000000% 0.000000% 2.~~016455~~227706% 60 Days 0.~~372480~~562810% 0.~~043821~~067537% 0.~~438212~~675371% 0.000000% 01.~~854514~~305718% 0.~~292271~~467333% 0.~~042163~~024952% 0.~~444018~~715323% 0.000000% 01.~~778452~~207609% 90 Days 0.~~241017~~292661% 0.~~000000~~022512% 0.~~328659~~382710% 0.000000% 0.~~569676~~697884% 0.~~170503~~251179% 0.~~000000~~027554% 0.~~342282~~356166% 0.000000% 0.~~512785~~634899% 120 Days 0.~~043821~~157587% 0.~~043821~~022512% 0.~~328659~~315173% 0.000000% 0.~~416301~~495272% 0.~~009537~~104926% 0.~~019112~~013996% 0.~~444539~~270262% 0.000000% 0.~~473188~~389184% 150 Days 0.~~021911~~045025% 0.~~087642~~022512% 0.~~438212~~292661% 0.~~021911~~022512% 0.~~569676~~382710% 0.~~003389~~009839% 0.~~115351~~005717% 0.~~467665~~373747% 0.~~007472~~031464% 0.~~593877~~420768% 180+ Days 0.~~021911~~067537% 0.~~000000~~045025% 0.~~131464~~472760% 0.~~000000~~112562% 0.~~153374~~697884% 0.~~011136~~058026% 0.~~000000~~019040% 0.~~079228~~388519% 0.~~000000~~159542% 0.~~090363~~625127% Totals 23.~~804557~~264295% 0.~~394391~~450248% 12.~~665206~~138676% 0.~~021911~~135074% 45.~~886065~~988294% 23.~~450205~~103392% 0.~~330067~~280478% 12.~~777732~~104018% 0.~~007472~~191007% 45.~~565476~~678894%

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 3 0 0 3 288,~~479~~369.3698 0.00 0.00 288,~~479~~369.3698 30 Days 46 01 0 0 47 ~~281~~678,~~070~~169.3582 046,721.0086 0.00 0.00 ~~281~~724,~~070~~891.3568 60 Days 12 0 01 0 13 54378,~~947~~003.1075 0.00 034,942.0032 0.00 54412,~~947~~946.1007 90 Days 21 0 20 0 41 ~~178~~54,~~775~~947.0110 0.00 ~~492,197~~0.1500 0.00 ~~670~~54,~~972~~947.1610 120 Days 01 0 31 0 32 061,905.0015 0.00 ~~352~~181,~~834~~835.4411 0.00 ~~352~~243,~~834~~740.4426 150 Days 0 0 03 0 03 0.00 0.00 0352,834.0044 0.00 0352,834.0044 180 Days 0 0 0 0 0 0.00 0.00 0.00 0.00 0.00 Totals 710 34 5 0 1519 ~~514~~1,~~792~~173,025.4682 ~~288~~335,~~479~~091.3684 ~~845~~569,~~031~~611.5987 0.00 12,~~648~~077,~~303~~729.4153 0-29 Days 0.~~377834~~386100% 0.000000% 0.000000% 0.~~377834~~386100% 0.~~234375~~241006% 0.000000% 0.000000% 0.~~234375~~241006% 30 Days 0.~~503778~~772201% 0.~~000000~~128700% 0.000000% 0.000000% 0.~~503778~~900901% 0.~~228356~~566782% 0.~~000000~~039048% 0.000000% 0.000000% 0.~~228356~~605830% 60 Days 0.~~125945~~257400% 0.000000% 0.~~000000~~128700% 0.000000% 0.~~125945~~386100% 0.~~044642~~315918% 0.000000% 0.~~000000~~029203% 0.000000% 0.~~044642~~345121% 90 Days 0.~~251889~~128700% 0.000000% 0.~~251889~~000000% 0.000000% 0.~~503778~~128700% 0.~~145246~~045922% 0.000000% 0.~~399885~~000000% 0.000000% 0.~~545131~~045922% 120 Days 0.~~000000~~128700% 0.000000% 0.~~377834~~128700% 0.000000% 0.~~377834~~257400% 0.~~000000~~051737% 0.000000% 0.~~286660~~151969% 0.000000% 0.~~286660~~203707% 150 Days 0.000000% 0.000000% 0.~~000000~~386100% 0.000000% 0.~~000000~~386100% 0.000000% 0.000000% 0.~~000000~~294882% 0.000000% 0.~~000000~~294882% 180 Days 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% 0.000000% Totals 01.~~881612~~287001% 0.~~377834~~514801% 0.~~629723~~643501% 0.000000% 12.~~889169~~445302% 0.~~418243~~980359% 0.~~234375~~280054% 0.~~686546~~476055% 0.000000% 1.~~339164~~736468% 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 1 0 0 1 92,616.36 0.00 0.00 92,616.36 30 Days 4033 1 0 0 4134 65,~~537~~102,~~777~~405.2446 7568,~~028~~734.6257 0.00 0.00 65,~~612~~171,~~805~~140.8603 60 Days 1013 2 912 0 2127 12,~~573~~164,~~194~~136.1090 ~~321~~125,~~570~~144.6468 1,~~446~~889,~~856~~823.0856 0.00 34,~~341~~179,~~620~~105.8214 90 Days 710 01 48 0 1119 ~~975~~1,~~018~~584,016.6018 0203,698.0061 ~~645~~1,~~774~~165,475.7129 0.00 12,~~620~~953,~~793~~190.3108 120 Days 05 1 35 0 411 0657,090.0082 103,~~500~~465.0067 ~~312~~675,~~936~~916.0966 0.00 ~~416~~1,436,473.0915 150 Days 0 10 53 0 63 0.00 ~~304,000~~0.00 ~~995~~312,~~426~~936.3309 0.00 1312,~~299,426~~936.3309 180 Days 0 0 03 02 05 0.00 0.00 0525,600.00 0304,826.0033 0830,426.0033 Totals 5761 6 2131 02 84100 9,~~085~~507,~~989~~649.9436 ~~896~~593,~~715~~659.6289 34,~~400~~569,~~993~~751.2160 0304,826.0033 1314,~~383~~975,~~698~~887.7718 0-29 Days 0.~~048286~~049751% 0.000000% 0.000000% 0.~~048286~~049751% 0.~~026665~~027571% 0.000000% 0.000000% 0.~~026665~~027571% 30 Days 1.~~931434~~641791% 0.~~048286~~049751% 0.000000% 0.000000% 1.~~979720~~691542% 1.~~882251~~518931% 0.~~021601~~020462% 0.000000% 0.000000% 1.~~903852~~539393% 60 Days 0.~~482859~~646766% 0.~~096572~~099502% 0.~~434573~~597015% 0.000000% 1.~~014003~~343284% 0.~~452929~~644240% 0.~~092581~~037254% 0.~~416555~~562580% 0.000000% 01.~~962065~~244075% 90 Days 0.~~338001~~497512% 0.~~000000~~049751% 0.~~193143~~398010% 0.000000% 0.~~531144~~945274% 0.~~280712~~471545% 0.~~000000~~060639% 0.~~185921~~346949% 0.000000% 0.~~466633~~879133% 120 Days 0.~~000000~~248756% 0.~~048286~~049751% 0.~~144858~~248756% 0.000000% 0.~~193143~~547264% 0.~~000000~~195609% 0.~~029798~~030801% 0.~~090096~~201213% 0.000000% 0.~~119894~~427623% 150 Days 0.000000% 0.~~048286~~000000% 0.~~241429~~149254% 0.000000% 0.~~289715~~149254% 0.000000% 0.~~087523~~000000% 0.~~286587~~093158% 0.000000% 0.~~374110~~093158% 180 Days 0.000000% 0.000000% 0.~~000000~~149254% 0.~~000000~~099502% 0.~~000000~~248756% 0.000000% 0.000000% 0.~~000000~~156465% 0.~~000000~~090744% 0.~~000000~~247209% Totals 23.~~752294~~034826% 0.~~289715~~298507% 1.~~014003~~542289% 0.~~000000~~099502% 4.~~056012~~975124% 2.~~615891~~830325% 0.~~258168~~176726% 01.~~979159~~360366% 0.~~000000~~090744% 34.~~853218~~458161% 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 12 0 0 12 ~~245~~278,~~848~~188.4144 0.00 0.00 ~~245~~278,~~848~~188.4144 30 Days 2124 0 0 0 2124 23,~~715~~330,~~122~~390.3530 0.00 0.00 0.00 23,~~715~~330,~~122~~390.3530 60 Days 47 0 3 0 10 568,030.91 0.00 4464,666.63 ~~231~~0.00 1,~~203~~032,697.8054 90 Days 0 0 0 0 0 0.00 0.00 0.00 ~~231,203~~0.8000 900.00 120 Days 1 0 1 0 2 56,690.32 0.00 40,141.71 0.00 96,832.03 ~~120~~150 Days 1 0 0 0 1 30,433.79 0.00 0.00 0.00 30,433.79 ~~150~~180 Days 13 10 6 01 810 25428,~~846~~966.9129 ~~435,000~~0.00 1973,~~175,083~~793.2636 ~~0.00 1~~377,~~635,930~~080.1706 ~~180 Days~~ 1 ~~0 1 0 2 84~~,~~928.40 0.00 58~~779,~~981~~839.1471 ~~0.00 143,909.54~~ Totals 2936 2 810 01 3949 34,~~144~~414,~~225~~511.5761 ~~680~~278,~~848~~188.4144 1,~~274~~478,~~206~~601.1170 0377,080.0006 56,~~099~~548,~~280~~381.0981 0-29 Days 0.~~162866~~333333% 0.000000% 0.000000% 0.~~162866~~333333% 0.~~329323~~381672% 0.000000% 0.000000% 0.~~329323~~381672% 30 Days 34.~~420195~~000000% 0.000000% 0.000000% 0.000000% 34.~~420195~~000000% 34.~~637007~~569264% 0.000000% 0.000000% 0.000000% 34.~~637007~~569264% 60 Days 01.~~651466~~166667% 0.000000% 0.~~000000~~500000% 0.000000% 01.~~651466~~666667% 0.~~309706~~779333% 0.000000% 0.~~000000~~637518% 0.000000% 01.~~309706~~416851% 90 Days 0.~~162866~~000000% 0.000000% 0.~~162866~~000000% 0.000000% 0.~~325733~~000000% 0.~~075939~~000000% 0.000000% 0.~~053771~~000000% 0.000000% 0.~~129710~~000000% 120 Days 0.~~162866~~166667% 0.000000% 0.~~000000~~166667% 0.000000% 0.~~162866~~333333% 0.~~040767~~077779% 0.000000% 0.~~000000~~055074% 0.000000% 0.~~040767~~132853% 150 Days 0.~~162866~~166667% 0.~~162866~~000000% 0.~~977199~~000000% 0.000000% 10.~~302932~~166667% 0.~~034623~~041755% 0.~~582699~~000000% 10.~~574067~~000000% 0.000000% 20.~~191389~~041755% 180 Days 0.~~162866~~500000% 0.000000% 01.~~162866~~000000% 0.~~000000~~166667% 01.~~325733~~666667% 0.~~113765~~588538% 0.000000% 01.~~079007~~336035% 0.~~000000~~517350% 02.~~192772~~441923% Totals 46.~~723127~~000000% 0.~~325733~~333333% 1.~~302932~~666667% 0.~~000000~~166667% 68.~~351792~~166667% 46.~~211806~~056668% 0.~~912022~~381672% 12.~~706846~~028628% 0.~~000000~~517350% 68.~~830674~~984318% 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 24 0 0 24 ~~138~~624,~~446~~202.1271 0.00 0.00 ~~138~~624,~~446~~202.1271 30 Days 3132 20 0 0 3332 57,~~440~~242,~~251~~270.2739 ~~329,838~~0.8500 0.00 0.00 57,~~770~~242,~~090~~270.1239 60 Days 23 01 1114 0 1318 ~~369~~344,~~744~~669.7941 059,316.0008 12,~~939~~898,~~579~~717.8177 0.00 23,~~309~~302,~~324~~703.6026 90 Days 12 0 89 0 911 89217,~~906~~918.7270 0.00 1,~~432~~467,~~404~~543.7334 0.00 1,~~522~~685,~~311~~462.4504 120 Days 10 10 97 0 117 ~~42,304~~0.4500 ~~42,266~~0.5900 21,~~724~~100,~~634~~065.8031 0.00 21,~~809~~100,~~205~~065.8431 150 Days 01 21 97 1 1210 042,304.0045 ~~140~~42,~~755~~266.1559 12,~~396~~097,~~276~~219.62 56232,~~986~~606.5701 12,~~594~~414,~~018~~396.3467 180 Days 0 02 512 02 516 0.00 0140,755.0015 ~~545~~1,~~273~~372,800.8412 0497,536.0057 ~~545~~2,~~273~~011,091.84 Totals 3538 78 4249 13 8598 57,~~942~~847,~~207~~162.2395 ~~651~~866,~~306~~540.7153 8,~~038~~936,~~169~~346.8016 56730,~~986~~142.5758 1418,~~688~~380,~~670~~192.3122 0-29 Days 0.~~184332~~379147% 0.000000% 0.000000% 0.~~184332~~379147% 0.~~063623~~296102% 0.000000% 0.000000% 0.~~063623~~296102% 30 Days 23.~~857143~~033175% 0.~~184332~~000000% 0.000000% 0.000000% 3.~~041475~~033175% 23.~~500068~~435501% 0.~~151577~~000000% 0.000000% 0.000000% 23.~~651645~~435501% 60 Days 0.~~184332~~284360% 0.~~000000~~094787% 1.~~013825~~327014% 0.000000% 1.~~198157~~706161% 0.~~169916~~163500% 0.~~000000~~028138% 01.~~891334~~375059% 0.000000% 1.~~061250~~566697% 90 Days 0.~~092166~~189573% 0.000000% 0.~~737327~~853081% 0.000000% 01.~~829493~~042654% 0.~~041317~~103374% 0.000000% 0.~~658262~~696156% 0.000000% 0.~~699578~~799529% 120 Days 0.~~092166~~000000% 0.~~092166~~000000% 0.~~829493~~663507% 0.000000% 10.~~013825~~663507% 0.~~019441~~000000% 0.~~019424~~000000% 10.~~252106~~521836% 0.000000% 10.~~290971~~521836% 150 Days 0.~~000000~~094787% 0.~~184332~~094787% 0.~~829493~~663507% 0.~~092166~~094787% 10.~~105991~~947867% 0.~~000000~~020068% 0.~~064684~~020050% 0.~~641659~~994854% 0.~~026188~~110341% 01.~~732531~~145312% 180 Days 0.000000% 0.~~000000~~189573% 01.~~460829~~137441% 0.~~000000~~189573% 01.~~460829~~516588% 0.000000% 0.~~000000~~066770% 0.~~250581~~651212% 0.~~000000~~236015% 0.~~250581~~953998% Totals 3.~~225806~~601896% 0.~~645161~~758294% 34.~~870968~~644550% 0.~~092166~~284360% 79.~~834101~~289100% 23.~~730742~~722443% 0.~~299308~~411059% 34.~~693941~~239116% 0.~~026188~~346356% 68.~~750179~~718975%

COLLATERAL STATEMENT Collateral Description Mixed Fixed & Arm Weighted Average Gross Coupon 7.~~861853~~859682% Weighted Average Net Coupon 7.~~361853~~359682% Weighted Average Pass-Through Rate 6.~~684401~~679105% Weighted Average Maturity(Stepdown Calculation ) ~~350~~349 Beginning Scheduled Collateral Loan Count 4,~~652~~564 Number Of Loans Paid In Full 88122 Ending Scheduled Collateral Loan Count 4,~~564~~442 Beginning Scheduled Collateral Balance ~~779~~762,~~060~~080,~~312~~888.0019 Ending Scheduled Collateral Balance ~~762~~738,~~080~~670,~~888~~253.1984 Ending Actual Collateral Balance at 3031-~~Sep~~Oct-2003 ~~762~~739,~~679~~266,~~567~~997.4327 Monthly P &I Constant 5,~~709~~588,~~399~~704.5939 Special Servicing Fee 0.00 Prepayment Penalties 0.00 Realized Loss Amount 048,359.0067 Cumulative Realized Loss 048,360.6532 Ending Scheduled Balance for Premium Loans ~~762~~738,~~080~~670,~~888~~253.1984 Scheduled Principal ~~605~~597,~~351~~276.8774 Unscheduled Principal 1622,~~374~~813,~~071~~357.9461

Miscellaneous Reporting Excess Cash Amount 1,~~786~~771,~~249~~079.7202 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.~~783303~~782932 7.~~664107~~657037 8.~~773091~~788024 Weighted Average Net Rate 7.~~283303~~282932 7.~~164107~~157037 8.~~273091~~288023 Weighted Average Maturity ~~350~~349 ~~350~~349 ~~347~~346 Beginning Loan Count ~~803~~794 2,~~109~~071 ~~633~~614 Loans Paid In Full 917 3861 1914 Ending Loan Count ~~794~~777 2,~~071~~010 ~~614~~600 Beginning Scheduled Balance ~~124~~122,~~403~~993,~~600~~044.1282 ~~354~~347,~~411~~074,~~445~~614.4967 7774,~~772~~590,~~186~~848.6444 Ending scheduled Balance ~~122~~119,~~993~~563,~~044~~732.8245 ~~347~~335,~~074~~657,~~614~~519.6781 7472,~~590~~823,~~848~~626.4466 Record Date 0910/3031/2003 0910/3031/2003 0910/3031/2003 Principal And Interest Constant ~~916~~906,~~177~~745.8411 2,~~534~~481,~~007~~856.7595 ~~629~~605,~~768~~541.0356 Scheduled Principal 109,~~285~~039.3864 ~~270~~267,~~468~~221.3600 6159,~~182~~286.6344 Unscheduled Principal 13,~~301~~320,~~269~~272.9273 711,~~066~~149,~~362~~873.4686 31,~~120~~707,~~155~~935.5734 Scheduled Interest ~~806~~797,~~892~~705.4647 2,~~263~~214,~~539~~635.3995 ~~568~~546,~~585~~255.4012 Servicing Fees 51,~~834~~247.8313 ~~147~~144,~~671~~614.4145 3231,~~405~~079.0654 Master Servicing Fees 0.00 0.00 0.00 Trustee Fee ~~362~~358.8574 1,~~033~~012.7334 ~~226~~217.8052 FRY Amount 0.00 0.00 0.00 Special Hazard Fee 0.00 0.00 0.00 Other Fee 46,~~943~~652.7206 ~~256~~253,~~625~~027.5127 2423,~~601~~098.1382 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 ~~707~~699,~~751~~447.0654 1,~~858~~815,~~208~~981.7489 ~~511~~491,~~352~~859.4124 Realized Loss Amount 0.00 048,359.0067 0.00 Cumulative Realized Loss 0.00 048,360.6532 0.00 Percentage of Cumulative Losses 0.000000 0.000130 0.000000 Prepayment Penalties 0.00 0.00 0.00 Special Servicing Fee 0.00 0.00 0.00 Pass-Through Rate 6.~~826983~~824265 6.~~291700~~278703 7.~~890004~~912915

Group Level Collateral Statement Group 2(B) Total Collateral Description Fixed 15/30 & ARM Mixed Fixed & Arm Weighted Average Coupon Rate 7.~~902244~~908097 7.~~861853~~859682 Weighted Average Net Rate 7.~~402244~~408097 7.~~361853~~359682 Weighted Average Maturity ~~347~~346 ~~350~~349 Beginning Loan Count 1,~~107~~085 4,~~652~~564 Loans Paid In Full 2230 88122 Ending Loan Count 1,~~085~~055 4,~~564~~442 Beginning Scheduled Balance ~~222~~217,~~473~~422,~~079~~380.7526 ~~779~~762,~~060~~080,~~312~~888.0019 Ending scheduled Balance ~~217~~210,~~422~~625,~~380~~374.2692 ~~762~~738,~~080~~670,~~888~~253.1984 Record Date 0910/3031/2003 0910/3031/2003 Principal And Interest Constant 1,~~629~~594,~~445~~560.9777 5,~~709~~588,~~399~~704.5939 Scheduled Principal ~~164~~161,~~415~~729.5066 ~~605~~597,~~351~~276.8774 Unscheduled Principal 46,~~886~~635,~~283~~275.9968 1622,~~374~~813,~~071~~357.9461 Scheduled Interest 1,~~465~~432,~~030~~831.4711 54,~~104~~991,~~047~~427.7265 Servicing Fees 9290,~~697~~592.1064 ~~324~~317,~~608~~533.4076 Master Servicing Fees 0.00 0.00 Trustee Fee ~~648~~634.8714 2,~~272~~222.2574 FRY Amount 0.00 0.00 Special Hazard Fee 0.00 0.00 Other Fee ~~109~~107,~~370~~211.5800 ~~437~~429,~~540~~989.9415 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,~~262~~234,~~313~~393.9233 4,~~339~~241,~~626~~682.1300 Realized Loss Amount 0.00 048,359.0067 Cumulative Realized Loss 0.00 048,360.6532 Percentage of Cumulative Losses 0.000000 0.000059 Prepayment Penalties 0.00 0.00 Special Servicing Fee 0.00 0.00 Pass-Through Rate 6.~~808809~~812877 6.~~684401~~679105

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