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 BEAR STEARNS ASSET BACKED SECURITIES TRUST Asset-Backed Certificates, Series 2003-AC1 Trust (Exact name of registrant as specified in its charter) New York (governing law of 333-43091-16 Pending 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 BEAR STEARNS ASSET BACKED SECURITIES TRUST, Asset-Backed Certificates, Series 2003-AC1 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-AC1 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. BEAR STEARNS ASSET BACKED SECURITIES TRUST Asset-Backed Certificates, Series 2003-AC1 Trust By: Wells Fargo Bank Minnesota, N.A., as Securities Administrator By: /s/ Beth Belfield, Assistant Vice President By: Beth Belfield, Assistant Vice President Date: 9/24/03 INDEX TO EXHIBITS Exhibit Number Description EX-99.1 Monthly report distributed to holders of Asset- Backed Certificates, Series 2003-AC1 Trust, relating to the September 25, 2003 distribution. EX-99.1 Bear Stearns Asset Backed Securities Asset-Backed Certificates Record Date: 8/31/03 Distribution Date: 9/25/03 BSA Series: 2003-AC1 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 <s> <c> <c> <c> <c> <c> <c> A-1 07384YHG4 SEN 4.10300% 369,177,668.95 1,262,279.97 15,898,710.48 A-IO 07384YHH2 IO 5.00000% 0.00 312,500.00 0.00 M-1 07384YHJ8 MEZ 4.60600% 23,338,720.56 89,581.79 1,005,086.69 M-2 07384YHK5 MEZ 4.96800% 19,095,162.45 79,053.97 822,337.01 B-1 07384YHL3 SUB 5.66500% 3,395,526.58 16,029.71 146,229.03 B-2 07384YHM1 SUB 4.36000% 9,335,318.41 35,048.93 402,027.36 R-1 BSA3AC1R1 RES 0.00000% 0.00 0.00 0.00 R-2 BSA3AC1R2 RES 0.00000% 0.00 0.00 0.00 R-3 BSA3AC1R3 RES 0.00000% 0.00 0.00 0.00 C BSA03AC1C SEN 0.00000% 0.00 690,420.24 0.00 P SEN 0.00000% 100.00 42,615.18 0.00 Totals 424,342,496.95 2,527,529.79 18,274,390.57 Certificateholder Distribution Summary (continued) Current Ending Cumulative Realized Certificate Total Realized Class Loss Balance Distribution Losses <s> <c> <c> <c> <c> A-1 0.00 353,278,958.47 17,160,990.45 0.00 A-IO 0.00 0.00 312,500.00 0.00 M-1 0.00 22,333,633.87 1,094,668.48 0.00 M-2 0.00 18,272,825.44 901,390.98 0.00 B-1 0.00 3,249,297.54 162,258.74 0.00 B-2 0.00 8,933,291.05 437,076.29 0.00 R-1 0.00 0.00 0.00 0.00 R-2 0.00 0.00 0.00 0.00 R-3 0.00 0.00 0.00 0.00 C 0.00 0.00 690,420.24 0.00 P 0.00 100.00 42,615.18 0.00 Totals 0.00 406,068,106.37 20,801,920.36 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-1 434,812,000.00 369,177,668.95 0.00 15,898,710.48 0.00 0.00 A-IO 0.00 0.00 0.00 0.00 0.00 0.00 M-1 27,488,000.00 23,338,720.56 0.00 1,005,086.69 0.00 0.00 M-2 22,490,000.00 19,095,162.45 0.00 822,337.01 0.00 0.00 B-1 3,999,201.00 3,395,526.58 0.00 146,229.03 0.00 0.00 B-2 10,995,000.00 9,335,318.41 0.00 402,027.36 0.00 0.00 R-1 0.00 0.00 0.00 0.00 0.00 0.00 R-2 0.00 0.00 0.00 0.00 0.00 0.00 R-3 0.00 0.00 0.00 0.00 0.00 0.00 C 0.00 0.00 0.00 0.00 0.00 0.00 P 100.00 100.00 0.00 0.00 0.00 0.00 Totals 499,784,301.00 424,342,496.95 0.00 18,274,390.57 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-1 15,898,710.48 353,278,958.47 0.81248668 15,898,710.48 A-IO 0.00 0.00 0.00000000 0.00 M-1 1,005,086.69 22,333,633.87 0.81248668 1,005,086.69 M-2 822,337.01 18,272,825.44 0.81248668 822,337.01 B-1 146,229.03 3,249,297.54 0.81248668 146,229.03 B-2 402,027.36 8,933,291.05 0.81248668 402,027.36 R-1 0.00 0.00 0.00000000 0.00 R-2 0.00 0.00 0.00000000 0.00 R-3 0.00 0.00 0.00000000 0.00 C 0.00 0.00 0.00000000 0.00 P 0.00 100.00 1.00000000 0.00 Totals 18,274,390.57 406,068,106.37 0.81248672 18,274,390.57 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-1 434,812,000.00 849.05124272 0.00000000 36.56456234 0.00000000 A-IO 0.00 0.00000000 0.00000000 0.00000000 0.00000000 M-1 27,488,000.00 849.05124272 0.00000000 36.56456235 0.00000000 M-2 22,490,000.00 849.05124277 0.00000000 36.56456247 0.00000000 B-1 3,999,201.00 849.05124299 0.00000000 36.56456127 0.00000000 B-2 10,995,000.00 849.05124238 0.00000000 36.56456207 0.00000000 R-1 0.00 0.00000000 0.00000000 0.00000000 0.00000000 R-2 0.00 0.00000000 0.00000000 0.00000000 0.00000000 R-3 0.00 0.00000000 0.00000000 0.00000000 0.00000000 C 0.00 0.00000000 0.00000000 0.00000000 0.00000000 P 100.00 1000.00000000 0.00000000 0.00000000 0.00000000 <FN> </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-1 0.00000000 36.56456234 812.48668038 0.81248668 36.56456234 A-IO 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 M-1 0.00000000 36.56456235 812.48668037 0.81248668 36.56456235 M-2 0.00000000 36.56456247 812.48668030 0.81248668 36.56456247 B-1 0.00000000 36.56456127 812.48667921 0.81248668 36.56456127 B-2 0.00000000 36.56456207 812.48668031 0.81248668 36.56456207 R-1 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 R-2 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 R-3 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 C 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 P 0.00000000 0.00000000 1,000.00000000 1.00000000 0.00000000 <FN> (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. </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-1 434,812,000.00 4.10300% 369,177,668.95 1,262,279.98 0.00 0.00 A-IO 0.00 5.00000% 75,000,000.00 312,500.00 0.00 0.00 M-1 27,488,000.00 4.60600% 23,338,720.56 89,581.79 0.00 0.00 M-2 22,490,000.00 4.96800% 19,095,162.45 79,053.97 0.00 0.00 B-1 3,999,201.00 5.66500% 3,395,526.58 16,029.72 0.00 0.00 B-2 10,995,000.00 4.36000% 9,335,318.41 35,048.93 0.00 0.00 R-1 0.00 0.00000% 0.00 0.00 0.00 0.00 R-2 0.00 0.00000% 0.00 0.00 0.00 0.00 R-3 0.00 0.00000% 0.00 0.00 0.00 0.00 C 0.00 0.00000% 0.00 0.00 0.00 0.00 P 100.00 0.00000% 100.00 0.00 0.00 0.00 Totals 499,784,301.00 1,794,494.39 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-1 0.01 0.00 1,262,279.97 0.00 353,278,958.47 A-IO 0.00 0.00 312,500.00 0.00 75,000,000.00 M-1 0.00 0.00 89,581.79 0.00 22,333,633.87 M-2 0.00 0.00 79,053.97 0.00 18,272,825.44 B-1 0.00 0.00 16,029.71 0.00 3,249,297.54 B-2 0.00 0.00 35,048.93 0.00 8,933,291.05 R-1 0.00 0.00 0.00 0.00 0.00 R-2 0.00 0.00 0.00 0.00 0.00 R-3 0.00 0.00 0.00 0.00 0.00 C 0.00 0.00 690,420.24 0.00 0.00 P 0.00 0.00 42,615.18 0.00 100.00 Totals 0.01 0.00 2,527,529.79 0.00 <FN> (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. </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-1 434,812,000.00 4.10300% 849.05124272 2.90304771 0.00000000 0.00000000 A-IO 0.00 5.00000% 1000.00000000 4.16666667 0.00000000 0.00000000 M-1 27,488,000.00 4.60600% 849.05124272 3.25894172 0.00000000 0.00000000 M-2 22,490,000.00 4.96800% 849.05124277 3.51507203 0.00000000 0.00000000 B-1 3,999,201.00 5.66500% 849.05124299 4.00823064 0.00000000 0.00000000 B-2 10,995,000.00 4.36000% 849.05124238 3.18771533 0.00000000 0.00000000 R-1 0.00 0.00000% 0.00000000 0.00000000 0.00000000 0.00000000 R-2 0.00 0.00000% 0.00000000 0.00000000 0.00000000 0.00000000 R-3 0.00 0.00000% 0.00000000 0.00000000 0.00000000 0.00000000 C 0.00 0.00000% 0.00000000 0.00000000 0.00000000 0.00000000 P 100.00 0.00000% 1000.00000000 0.00000000 0.00000000 0.00000000 <FN> (5) Per $1 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-1 0.00000002 0.00000000 2.90304768 0.00000000 812.48668038 A-IO 0.00000000 0.00000000 4.16666667 0.00000000 1000.00000000 M-1 0.00000000 0.00000000 3.25894172 0.00000000 812.48668037 M-2 0.00000000 0.00000000 3.51507203 0.00000000 812.48668030 B-1 0.00000000 0.00000000 4.00822814 0.00000000 812.48667921 B-2 0.00000000 0.00000000 3.18771533 0.00000000 812.48668031 R-1 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 R-2 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 R-3 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 C 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 P 0.00000000 0.00000000 426151.80000000 0.00000000 1000.00000000 <FN> (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. </FN> CERTIFICATEHOLDER ACCOUNT STATEMENT CERTIFICATE ACCOUNT <s> <c> Beginning Balance 0.00 Deposits Payments of Interest and Principal 20,890,671.28 Liquidations, Insurance Proceeds, Reserve Funds 0.00 Proceeds from Repurchased Loans 0.00 Other Amounts (Servicer Advances) 76,570.61 Realized Loss (Gains, Subsequent Expenses & Recoveries) 0.00 Prepayment Penalties 0.00 Total Deposits 20,967,241.89 Withdrawals Reimbursement for Servicer Advances 71,053.26 Payment of Service Fee 94,268.27 Payment of Interest and Principal 20,801,920.36 Total Withdrawals (Pool Distribution Amount) 20,967,241.89 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 0.01 SERVICING FEES <s> <c> Gross Servicing Fee 88,925.30 Master Servicing Fee 3,557.04 Miscellaneous Fee 1,785.93 Supported Prepayment/Curtailment Interest Shortfall 0.00 Net Servicing Fee 94,268.27 OTHER ACCOUNTS Beginning Current Current Ending Account Type Balance Withdrawals Deposits Balance <s> <c> <c> <c> <c> Reserve Fund 5,000.00 0.00 0.00 5,000.00 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 0 0 1 1 0.00 0.00 297,832.86 297,832.86 30 Days 19 0 0 0 19 3,277,437.64 0.00 0.00 0.00 3,277,437.64 60 Days 12 0 0 0 12 1,884,753.54 0.00 0.00 0.00 1,884,753.54 90 Days 7 0 0 0 7 1,590,866.81 0.00 0.00 0.00 1,590,866.81 120 Days 6 0 0 0 6 2,663,440.29 0.00 0.00 0.00 2,663,440.29 150 Days 2 0 0 0 2 182,712.71 0.00 0.00 0.00 182,712.71 180+ Days 1 0 0 0 1 543,668.81 0.00 0.00 0.00 543,668.81 Totals 47 0 0 1 48 10,142,879.80 0.00 0.00 297,832.86 10,440,712.66 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 0.000000% 0.000000% 0.061805% 0.061805% 0.000000% 0.000000% 0.072830% 0.072830% 30 Days 1.174289% 0.000000% 0.000000% 0.000000% 1.174289% 0.801445% 0.000000% 0.000000% 0.000000% 0.801445% 60 Days 0.741656% 0.000000% 0.000000% 0.000000% 0.741656% 0.460886% 0.000000% 0.000000% 0.000000% 0.460886% 90 Days 0.432633% 0.000000% 0.000000% 0.000000% 0.432633% 0.389021% 0.000000% 0.000000% 0.000000% 0.389021% 120 Days 0.370828% 0.000000% 0.000000% 0.000000% 0.370828% 0.651302% 0.000000% 0.000000% 0.000000% 0.651302% 150 Days 0.123609% 0.000000% 0.000000% 0.000000% 0.123609% 0.044679% 0.000000% 0.000000% 0.000000% 0.044679% 180+ Days 0.061805% 0.000000% 0.000000% 0.000000% 0.061805% 0.132946% 0.000000% 0.000000% 0.000000% 0.132946% Totals 2.904821% 0.000000% 0.000000% 0.061805% 2.966625% 2.480280% 0.000000% 0.000000% 0.072830% 2.553110% OTHER INFORMATION <s> <c> Current Period Class A Insufficient Funds 0.00 Principal Balance of Contaminated Properties 0.00 Periodic Advance 76,570.61 COLLATERAL STATEMENT Collateral Description Mixed Fixed Weighted Average Gross Coupon 7.250982% Weighted Average Net Coupon 7.000982% Weighted Average Pass-Through Rate 6.985961% Weighted Average Maturity(Stepdown Calculation ) 330 Beginning Scheduled Collateral Loan Count 1,674 Number Of Loans Paid In Full 56 Ending Scheduled Collateral Loan Count 1,618 Beginning Scheduled Collateral Balance 426,841,418.95 Ending Scheduled Collateral Balance 408,567,028.38 Ending Actual Collateral Balance at 31-Aug-2003 408,940,999.64 Monthly P &I Constant 2,999,055.49 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 408,567,028.38 Scheduled Principal 419,872.64 Unscheduled Principal 17,854,517.93 Required Overcollateralization Amount 0.00 Overcollateralized Increase Amount 0.00 Overcollateralized reduction Amount 0.00 Specified O/C Amount 2,498,922.00 Overcollateralized Amount 2,499,022.00 Overcollateralized Deficiency Amount 0.00 Base Overcollateralized Amount 0.00 Extra principal distribution Amount 0.00 Excess Cash Amount 733,035.40 Miscellaneous Reporting Three month rolling average 0.013140%