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): March 25, 2004
BEAR STEARNS ASSET BACKED SECURITIES TRUST
Asset-Backed Certificates, Series 2003-SD1 Trust
(Exact name of registrant as specified in its charter)
New York (governing law of 333-91334-09 54-2126335
Pooling and Servicing Agreement) (Commission 54-2126334
(State or other File Number) IRS EIN
jurisdiction
of Incorporation)
c/o Wells Fargo Bank, N.A.,
9062 Old Annapolis Road
Columbia, MD 21045
(Address of principal executive offices) (Zip Code)
Registrant's telephone number, including area code: (410) 884-2000
(Former name or former address, if changed since last report)
ITEM 5. Other Events
On March 25, 2004 a distribution was made to holders of BEAR STEARNS ASSET
BACKED SECURITIES TRUST, Asset-Backed Certificates, Series 2003-SD1 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 Asset-Backed Certificates,
Series 2003-SD1 Trust, relating to the
March 25, 2004 distribution.
Pursuant to the requirements of the Securities Exchange Act of 1934, the
registrant has duly caused this report to be signed on its behalf by the
undersigned hereunto duly authorized.
BEAR STEARNS ASSET BACKED SECURITIES TRUST
Asset-Backed Certificates, Series 2003-SD1 Trust
By: Wells Fargo Bank, N.A. as Securities Administrator
By: /s/ Beth Belfield as Assistant Vice President
By: Beth Belfield as Assistant Vice President
Date: 4/2/2004
INDEX TO EXHIBITS
Exhibit Number Description
EX-99.1 Monthly report distributed to holders of Asset-
Backed Certificates, Series 2003-SD1 Trust,
relating to the March 25, 2004 distribution.
EX-99.1
Bear Stearns Asset Backed Securities
Asset-Backed Certificates
Record Date: 2/29/2004
Distribution Date: 3/25/2004
BSA Series: 2003-SD1
Contact: Customer Service - CTSLink
Wells Fargo Bank, N.A.
Securities Administration Services
7485 New Horizon Way
Frederick, MD 21703
Telephone: (301) 815-6600
Fax: (301) 815-6660
Certificateholder Distribution Summary
Certificate Certificate Beginning
Class Pass-Through Certificate Interest Principal
Class CUSIP Description Rate Balance Distribution Distribution
<s> <c> <c> <c> <c> <c> <c>
A 07384YKL9 SEN 1.54000% 142,266,336.82 176,489.29 3,591,353.26
R-1 BSA03S1R1 RES 0.00000% 0.00 0.00 0.00
R-2 BSA03S1R2 RES 0.00000% 0.00 0.00 0.00
M-1 07384YKM7 MEZ 1.94000% 8,295,000.00 12,963.24 0.00
M-2 07384YKN5 MEZ 3.14000% 7,258,000.00 18,358.71 0.00
B 07384YKP0 SUB 4.59000% 5,185,000.00 19,171.54 0.00
B-IO BSA03SBIO IO 0.00000% 0.00 50,769.31 0.00
OC BSA03S1OC OC 0.00000% 3,541,036.70 0.00 0.00
Totals 166,545,373.52 277,752.09 3,591,353.26
Certificateholder Distribution Summary (continued)
Current Ending Cumulative
Realized Certificate Total Realized
Class Loss Balance Distribution Losses
<s> <c> <c> <c> <c>
A 0.00 138,674,983.56 3,767,842.55 0.00
R-1 0.00 0.00 0.00 0.00
R-2 0.00 0.00 0.00 0.00
M-1 0.00 8,295,000.00 12,963.24 0.00
M-2 0.00 7,258,000.00 18,358.71 0.00
B 0.00 5,185,000.00 19,171.54 0.00
B-IO 0.00 0.00 50,769.31 0.00
OC 0.00 4,146,749.09 0.00 0.00
Totals 0.00 163,559,732.65 3,869,105.35 0.00
<FN>
All distributions required by the Pooling and Servicing Agreement have been calculated by the
Certificate Administrator on behalf of the Trustee.
</FN>
Principal Distribution Statement
Original Beginning Scheduled Unscheduled
Face Certificate Principal Principal Realized
Class Amount Balance Distribution Distribution Accretion Loss (1)
<s> <c> <c> <c> <c> <c> <c>
A 186,599,000.00 142,266,336.82 0.00 3,591,353.26 0.00 0.00
R-1 50.00 0.00 0.00 0.00 0.00 0.00
R-2 50.00 0.00 0.00 0.00 0.00 0.00
M-1 8,295,000.00 8,295,000.00 0.00 0.00 0.00 0.00
M-2 7,258,000.00 7,258,000.00 0.00 0.00 0.00 0.00
B 5,185,000.00 5,185,000.00 0.00 0.00 0.00 0.00
B-IO 0.00 0.00 0.00 0.00 0.00 0.00
OC 454.31 3,541,036.70 0.00 0.00 0.00 0.00
Totals 207,337,554.31 166,545,373.52 0.00 3,591,353.26 0.00 0.00
<FN>
(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.
</FN>
Principal Distribution Statement (continued)
Total Ending Ending Total
Principal Certificate Certificate Principal
Class Reduction Balance Percentage Distribution
<s> <c> <c> <c> <c>
A 3,591,353.26 138,674,983.56 0.74317110 3,591,353.26
R-1 0.00 0.00 0.00000000 0.00
R-2 0.00 0.00 0.00000000 0.00
M-1 0.00 8,295,000.00 1.00000000 0.00
M-2 0.00 7,258,000.00 1.00000000 0.00
B 0.00 5,185,000.00 1.00000000 0.00
B-IO 0.00 0.00 0.00000000 0.00
OC 0.00 4,146,749.09 9,127.57608241 0.00
Totals 3,591,353.26 163,559,732.65 0.78885725 3,591,353.26
Principal Distribution Factors Statement
Original Beginning Scheduled Unscheduled
Face Certificate Principal Principal
Class (2) Amount Balance Distribution Distribution Accretion
<s> <c> <c> <c> <c> <c>
A 186,599,000.00 762.41746644 0.00000000 19.24636927 0.00000000
R-1 50.00 0.00000000 0.00000000 0.00000000 0.00000000
R-2 50.00 0.00000000 0.00000000 0.00000000 0.00000000
M-1 8,295,000.00 1000.00000000 0.00000000 0.00000000 0.00000000
M-2 7,258,000.00 1000.00000000 0.00000000 0.00000000 0.00000000
B 5,185,000.00 1000.00000000 0.00000000 0.00000000 0.00000000
B-IO 0.00 0.00000000 0.00000000 0.00000000 0.00000000
OC 454.31 7794318.19682596 0.00000000 0.00000000 0.00000000
<FN>
All classes are per $1,000 denomination.
</FN>
Principal Distribution Factors Statement (continued)
Total Ending Ending Total
Realized Principal Certificate Certificate Principal
Class Loss (3) Reduction Balance Percentage Distribution
<s> <c> <c> <c> <c> <c>
A 0.00000000 19.24636927 743.17109717 0.74317110 19.24636927
R-1 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000
R-2 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000
M-1 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000
M-2 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000
B 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000
B-IO 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000
OC 0.00000000 0.00000000 9,127,576.08241069 9127.57608241 0.00000000
<FN>
(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.
</FN>
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
<s> <c> <c> <c> <c> <c> <c>
A 186,599,000.00 1.54000% 142,266,336.82 176,489.29 0.00 0.00
R-1 50.00 0.00000% 0.00 0.00 0.00 0.00
R-2 50.00 0.00000% 0.00 0.00 0.00 0.00
M-1 8,295,000.00 1.94000% 8,295,000.00 12,963.24 0.00 0.00
M-2 7,258,000.00 3.14000% 7,258,000.00 18,358.71 0.00 0.00
B 5,185,000.00 4.59000% 5,185,000.00 19,171.54 0.00 0.00
B-IO 0.00 0.00000% 166,545,373.52 0.00 0.00 0.00
OC 454.31 0.00000% 3,541,036.70 0.00 0.00 0.00
Totals 207,337,554.31 226,982.78 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
<s> <c> <c> <c> <c> <c>
A 0.00 0.00 176,489.29 0.00 138,674,983.56
R-1 0.00 0.00 0.00 0.00 0.00
R-2 0.00 0.00 0.00 0.00 0.00
M-1 0.00 0.00 12,963.24 0.00 8,295,000.00
M-2 0.00 0.00 18,358.71 0.00 7,258,000.00
B 0.00 0.00 19,171.54 0.00 5,185,000.00
B-IO 0.00 0.00 50,769.31 0.00 163,559,732.65
OC 0.00 0.00 0.00 0.00 4,146,749.09
Totals 0.00 0.00 277,752.09 0.00
<FN>
(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.
</FN>
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
<s> <c> <c> <c> <c> <c> <c>
A 186,599,000.00 1.54000% 762.41746644 0.94582120 0.00000000 0.00000000
R-1 50.00 0.00000% 0.00000000 0.00000000 0.00000000 0.00000000
R-2 50.00 0.00000% 0.00000000 0.00000000 0.00000000 0.00000000
M-1 8,295,000.00 1.94000% 1000.00000000 1.56277758 0.00000000 0.00000000
M-2 7,258,000.00 3.14000% 1000.00000000 2.52944475 0.00000000 0.00000000
B 5,185,000.00 4.59000% 1000.00000000 3.69750048 0.00000000 0.00000000
B-IO 0.00 0.00000% 803.25754010 0.00000000 0.00000000 0.00000000
OC 454.31 0.00000% 7794318.19682596 0.00000000 0.00000000 0.00000000
<FN>
All classes are per $1,000 denomination.
</FN>
Interest Distribution Factors Statement (continued)
Remaining Ending
Non-Supported Total Unpaid Certificate/
Interest Realized Interest Interest Notional
Class Shortfall Losses (6) Distribution Shortfall Balance
<s> <c> <c> <c> <c> <c>
A 0.00000000 0.00000000 0.94582120 0.00000000 743.17109717
R-1 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000
R-2 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000
M-1 0.00000000 0.00000000 1.56277758 0.00000000 1000.00000000
M-2 0.00000000 0.00000000 2.52944475 0.00000000 1000.00000000
B 0.00000000 0.00000000 3.69750048 0.00000000 1000.00000000
B-IO 0.00000000 0.00000000 0.24486319 0.00000000 788.85762919
OC 0.00000000 0.00000000 0.00000000 0.00000000 9127576.08241069
<FN>
(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.
</FN>
CERTIFICATEHOLDER ACCOUNT STATEMENT
CERTIFICATE ACCOUNT
<s> <c>
Beginning Balance 0.00
Deposits
Payments of Interest and Principal 3,902,254.17
Liquidations, Insurance Proceeds, Reserve Funds 0.00
Proceeds from Repurchased Loans 0.00
Other Amounts (Servicer Advances) 119,936.77
Realized Loss (Gains, Subsequent Expenses & Recoveries) 0.00
Prepayment Penalties 0.00
Total Deposits 4,022,190.94
Withdrawals
Reimbursement for Servicer Advances 100,063.93
Payment of Service Fee 53,021.66
Payment of Interest and Principal 3,869,105.35
Total Withdrawals (Pool Distribution Amount) 4,022,190.94
Ending Balance 0.00
PREPAYMENT/CURTAILMENT INTEREST SHORTFALL
<s> <c>
Total Prepayment/Curtailment Interest Shortfall 0.00
Servicing Fee Support 0.00
Non-Supported Prepayment/Curtailment Interest Shortfall 0.00
SERVICING FEES
<s> <c>
Gross Servicing Fee 51,633.78
Master Servicing Fee 1,387.88
Supported Prepayment/Curtailment Interest Shortfall 0.00
Net Servicing Fee 53,021.66
OTHER ACCOUNTS
Beginning Current Current Ending
Account Type Balance Withdrawals Deposits Balance
<s> <c> <c> <c> <c>
Financial Guaranty 0.00 0.00 0.00 0.00
Reserve Fund 0.00 0.00 0.00 0.00
LOAN STATUS STRATIFICATION/CREDIT ENHANCEMENT STATEMENT
DELINQUENCY STATUS
DELINQUENT BANKRUPTCY FORECLOSURE REO Total
<s> <c> <c> <c> <c> <c>
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 20 0 0 20
2,104,877.82 0.00 0.00 2,104,877.82
30 Days 45 2 0 0 47
5,074,929.80 252,348.62 0.00 0.00 5,327,278.42
60 Days 26 5 1 0 32
3,177,903.91 623,961.61 134,171.30 0.00 3,936,036.82
90 Days 11 2 5 0 18
1,104,452.21 207,910.06 460,025.74 0.00 1,772,388.01
120 Days 12 1 4 0 17
1,298,243.61 104,370.57 424,792.90 0.00 1,827,407.08
150 Days 5 0 5 0 10
542,230.69 0.00 577,706.33 0.00 1,119,937.02
180+ Days 11 6 5 3 25
1,459,840.04 490,416.65 445,185.39 231,996.02 2,627,438.10
Totals 110 36 20 3 169
12,657,600.26 3,783,885.33 2,041,881.66 231,996.02 18,715,363.27
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 1.790510% 0.000000% 0.000000% 1.790510%
1.284423% 0.000000% 0.000000% 1.284423%
30 Days 4.028648% 0.179051% 0.000000% 0.000000% 4.207699%
3.096785% 0.153986% 0.000000% 0.000000% 3.250771%
60 Days 2.327663% 0.447628% 0.089526% 0.000000% 2.864816%
1.939196% 0.380749% 0.081873% 0.000000% 2.401818%
90 Days 0.984781% 0.179051% 0.447628% 0.000000% 1.611459%
0.673950% 0.126869% 0.280713% 0.000000% 1.081533%
120 Days 1.074306% 0.089526% 0.358102% 0.000000% 1.521934%
0.792204% 0.063688% 0.259214% 0.000000% 1.115106%
150 Days 0.447628% 0.000000% 0.447628% 0.000000% 0.895255%
0.330876% 0.000000% 0.352524% 0.000000% 0.683399%
180+ Days 0.984781% 0.537153% 0.447628% 0.268577% 2.238138%
0.890812% 0.299258% 0.271658% 0.141567% 1.603295%
Totals 9.847807% 3.222919% 1.790510% 0.268577% 15.129812%
7.723824% 2.308974% 1.245981% 0.141567% 11.420347%
OTHER INFORMATION
<s> <c>
Current Period Class A Insufficient Funds 0.00
Principal Balance of Contaminated Properties 0.00
Periodic Advance 119,936.77
COLLATERAL STATEMENT
Collateral Description Mixed Fixed
Weighted Average Gross Coupon 6.747079%
Weighted Average Net Coupon 6.375045%
Weighted Average Pass-Through Rate 6.365044%
Weighted Average Maturity(Stepdown Calculation ) 356
Beginning Scheduled Collateral Loan Count 1,130
Number Of Loans Paid In Full 13
Ending Scheduled Collateral Loan Count 1,117
Beginning Scheduled Collateral Balance 166,545,373.52
Ending Scheduled Collateral Balance 163,559,732.65
Ending Actual Collateral Balance at 29-Feb-2004 163,877,367.82
Monthly P &I Constant 1,212,608.92
Special Servicing Fee 0.00
Prepayment Penalties 0.00
Realized Loss Amount 0.00
Cumulative Realized Loss 0.00
Ending Scheduled Balance for Premium Loans 163,559,732.65
Scheduled Principal 276,196.66
Unscheduled Principal 2,709,444.21
Required Overcollateralization Amount 0.00
Overcollateralized Increase Amount 605,712.39
Overcollateralized reduction Amount 0.00
Specified O/C Amount 4,146,749.09
Overcollateralized Amount 4,146,749.09
Overcollateralized Deficiency Amount 0.00
Base Overcollateralized Amount 0.00
Extra principal distribution Amount 605,712.39
Excess Cash Amount 656,481.70
Miscellaneous Reporting
Three month rolling average 0.059265%
Trigger Event NO