UNITED STATES SECURITIES AND EXCHANGE COMMISSION Washington D. C. 20549 Form 8-K/A Current Report Pursuant to Section 13 or 15(d) of The Securities Exchange Act of 1934 Date of Report (Date of earliest event reported): May 25, 2004 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 90-0175032 Pooling and Servicing Agreement) (Commission 90-0175026 (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 Subsequent to filing the 8-K relating to the payment date on May 25, 2004, a revision was made to the BEAR STEARNS ASSET BACKED SECURITIES TRUST, Asset Backed Certificates, Series 2003-AC1 which was not included in the original 8-K filed. The 8-K is being amended because the delinquency stratification table has been revised. This revision was not previously disclosed in a 1934 Act filing. The revised data has been and will continue to be available on the Wells Fargo Bank, as Securities Administrator, website at www.ctslink.com. 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 Amended monthly report distributed to holders of Asset Backed Certificates, Series 2003-AC1 Trust, relating to the May 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-AC1 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: 7/14/04 INDEX TO EXHIBITS Exhibit Number Description EX-99.1 Amended monthly report distributed to holders of Asset Backed Certificates, Series 2003-AC1 Trust, relating to the May 25, 2004 distribution. EX-99.1 Bear Stearns Asset Backed Securities Asset Backed Certificates Record Date: 4/30/04 Distribution Date: 5/25/04 BSA Series: 2003-AC1 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-1 07384YHG4 SEN 4.10300% 244,873,995.65 837,265.00 16,768,933.56 A-IO 07384YHH2 IO 5.00000% 0.00 312,500.00 0.00 M-1 07384YHJ8 MEZ 4.60600% 15,480,475.22 59,419.22 1,060,100.56 M-2 07384YHK5 MEZ 4.96800% 12,665,740.97 52,436.17 867,347.99 B-1 07384YHL3 SUB 5.66500% 2,252,238.50 10,632.44 154,232.95 B-2 07384YHM1 SUB 4.35000% 6,192,077.45 21,698.07 424,032.51 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% 2,499,022.00 347,369.41 0.00 P SEN 0.00000% 100.00 38,675.55 0.00 Totals 283,963,649.79 1,679,995.86 19,274,647.57 Certificateholder Distribution Summary (continued) Current Ending Cumulative Realized Certificate Total Realized Class Loss Balance Distribution Losses <s> <c> <c> <c> <c> A-1 0.00 228,105,062.09 17,606,198.56 0.00 A-IO 0.00 0.00 312,500.00 0.00 M-1 0.00 14,420,374.66 1,119,519.78 0.00 M-2 0.00 11,798,392.98 919,784.16 0.00 B-1 0.00 2,098,005.56 164,865.39 0.00 B-2 0.00 5,768,044.94 445,730.58 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 2,499,022.00 347,369.41 0.00 P 0.00 100.00 38,675.55 0.00 Totals 0.00 264,689,002.23 20,954,643.43 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-1 434,812,000.00 244,873,995.65 0.00 16,768,933.56 0.00 0.00 A-IO 0.00 0.00 0.00 0.00 0.00 0.00 M-1 27,488,000.00 15,480,475.22 0.00 1,060,100.56 0.00 0.00 M-2 22,490,000.00 12,665,740.97 0.00 867,347.99 0.00 0.00 B-1 3,999,201.00 2,252,238.50 0.00 154,232.95 0.00 0.00 B-2 10,995,000.00 6,192,077.45 0.00 424,032.51 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 2,499,022.00 0.00 0.00 0.00 0.00 P 100.00 100.00 0.00 0.00 0.00 0.00 Totals 499,784,301.00 283,963,649.79 0.00 19,274,647.57 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 16,768,933.56 228,105,062.09 0.52460618 16,768,933.56 A-IO 0.00 0.00 0.00000000 0.00 M-1 1,060,100.56 14,420,374.66 0.52460618 1,060,100.56 M-2 867,347.99 11,798,392.98 0.52460618 867,347.99 B-1 154,232.95 2,098,005.56 0.52460618 154,232.95 B-2 424,032.51 5,768,044.94 0.52460618 424,032.51 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 2,499,022.00 0.00000000 0.00 P 0.00 100.00 1.00000000 0.00 Totals 19,274,647.57 264,689,002.23 0.52960648 19,274,647.57 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-1 434,812,000.00 563.17211956 0.00000000 38.56594013 0.00000000 A-IO 0.00 0.00000000 0.00000000 0.00000000 0.00000000 M-1 27,488,000.00 563.17211947 0.00000000 38.56594005 0.00000000 M-2 22,490,000.00 563.17211961 0.00000000 38.56593997 0.00000000 B-1 3,999,201.00 563.17211863 0.00000000 38.56594105 0.00000000 B-2 10,995,000.00 563.17211915 0.00000000 38.56593997 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 38.56594013 524.60617943 0.52460618 38.56594013 A-IO 0.00000000 0.00000000 0.00000000 0.00000000 0.00000000 M-1 0.00000000 38.56594005 524.60617942 0.52460618 38.56594005 M-2 0.00000000 38.56593997 524.60617964 0.52460618 38.56593997 B-1 0.00000000 38.56594105 524.60618008 0.52460618 38.56594105 B-2 0.00000000 38.56593997 524.60617917 0.52460618 38.56593997 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, 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-1 434,812,000.00 4.10300% 244,873,995.65 837,265.00 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% 15,480,475.22 59,419.22 0.00 0.00 M-2 22,490,000.00 4.96800% 12,665,740.97 52,436.17 0.00 0.00 B-1 3,999,201.00 5.66500% 2,252,238.50 10,632.44 0.00 0.00 B-2 10,995,000.00 4.35000% 6,192,077.45 21,698.07 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% 2,499,022.00 0.00 0.00 0.00 P 100.00 0.00000% 100.00 0.00 0.00 0.00 Totals 499,784,301.00 1,293,950.90 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 0.00 837,265.00 0.00 228,105,062.09 A-IO 0.00 0.00 312,500.00 0.00 75,000,000.00 M-1 0.00 0.00 59,419.22 0.00 14,420,374.66 M-2 0.00 0.00 52,436.17 0.00 11,798,392.98 B-1 0.00 0.00 10,632.44 0.00 2,098,005.56 B-2 0.00 0.00 21,698.07 0.00 5,768,044.94 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 0.00 347,369.41 0.00 2,499,022.00 P 0.00 0.00 38,675.55 0.00 100.00 Totals 0.01 0.00 1,679,995.86 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-1 434,812,000.00 4.10300% 563.17211956 1.92557933 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% 563.17211947 2.16164217 0.00000000 0.00000000 M-2 22,490,000.00 4.96800% 563.17211961 2.33153268 0.00000000 0.00000000 B-1 3,999,201.00 5.66500% 563.17211863 2.65864106 0.00000000 0.00000000 B-2 10,995,000.00 4.35000% 563.17211915 1.97344884 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 1.92557933 0.00000000 524.60617943 A-IO 0.00000000 0.00000000 4.16666667 0.00000000 1000.00000000 M-1 0.00000000 0.00000000 2.16164217 0.00000000 524.60617942 M-2 0.00000000 0.00000000 2.33153268 0.00000000 524.60617964 B-1 0.00000000 0.00000000 2.65864106 0.00000000 524.60618008 B-2 0.00000000 0.00000000 1.97344884 0.00000000 524.60617917 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 386755.50000000 0.00000000 1000.00000000 <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 21,017,442.10 Liquidations, Insurance Proceeds, Reserve Funds 0.00 Proceeds from Repurchased Loans 0.00 Other Amounts (Servicer Advances) 100,911.68 Realized Loss (Gains, Subsequent Expenses & Recoveries) 0.00 Prepayment Penalties 0.00 Total Deposits 21,118,353.78 Withdrawals Reimbursement for Servicer Advances 101,055.19 Payment of Service Fee 62,655.16 Payment of Interest and Principal 20,954,643.43 Total Withdrawals (Pool Distribution Amount) 21,118,353.78 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 59,159.09 Master Servicing Fee 2,366.36 Miscellaneous Fee 1,129.71 Supported Prepayment/Curtailment Interest Shortfall 0.00 Net Servicing Fee 62,655.16 OTHER ACCOUNTS Beginning Current Current Ending Account Type Balance Withdrawals Deposits Balance <s> <c> <c> <c> <c> Reserve Fund 5,163.51 84.83 84.83 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 5 0 0 5 526,356.50 0.00 0.00 526,356.50 30 Days 16 0 0 0 16 4,190,284.29 0.00 0.00 0.00 4,190,284.29 60 Days 5 1 0 0 6 1,068,326.14 71,109.89 0.00 0.00 1,139,436.03 90 Days 6 0 2 0 8 569,668.73 0.00 309,853.73 0.00 879,522.46 120 Days 0 0 1 0 1 0.00 0.00 367,306.00 0.00 367,306.00 150 Days 0 0 3 0 3 0.00 0.00 866,032.39 0.00 866,032.39 180+ Days 2 4 12 4 22 422,396.51 2,831,727.57 2,617,845.12 501,874.43 6,373,843.63 Totals 29 10 18 4 61 6,250,675.67 3,429,193.96 4,161,037.24 501,874.43 14,342,781.30 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 0.448833% 0.000000% 0.000000% 0.448833% 0.198631% 0.000000% 0.000000% 0.198631% 30 Days 1.436266% 0.000000% 0.000000% 0.000000% 1.436266% 1.581283% 0.000000% 0.000000% 0.000000% 1.581283% 60 Days 0.448833% 0.089767% 0.000000% 0.000000% 0.538600% 0.403153% 0.026835% 0.000000% 0.000000% 0.429988% 90 Days 0.538600% 0.000000% 0.179533% 0.000000% 0.718133% 0.214975% 0.000000% 0.116929% 0.000000% 0.331905% 120 Days 0.000000% 0.000000% 0.089767% 0.000000% 0.089767% 0.000000% 0.000000% 0.138610% 0.000000% 0.138610% 150 Days 0.000000% 0.000000% 0.269300% 0.000000% 0.269300% 0.000000% 0.000000% 0.326814% 0.000000% 0.326814% 180+ Days 0.179533% 0.359066% 1.077199% 0.359066% 1.974865% 0.159399% 1.068606% 0.987894% 0.189392% 2.405291% Totals 2.603232% 0.897666% 1.615799% 0.359066% 5.475763% 2.358811% 1.294072% 1.570246% 0.189392% 5.412521% OTHER INFORMATION <s> <c> Current Period Class A Insufficient Funds 0.00 Principal Balance of Contaminated Properties 0.00 Periodic Advance 100,911.68 COLLATERAL STATEMENT Collateral Description Mixed Fixed Weighted Average Gross Coupon 7.205168% Weighted Average Net Coupon 6.955168% Weighted Average Pass-Through Rate 6.940394% Weighted Average Maturity(Stepdown Calculation ) 322 Beginning Scheduled Collateral Loan Count 1,180 Number Of Loans Paid In Full 66 Ending Scheduled Collateral Loan Count 1,114 Beginning Scheduled Collateral Balance 283,963,549.80 Ending Scheduled Collateral Balance 264,688,902.23 Ending Actual Collateral Balance at 30-Apr-2004 264,992,614.03 Monthly P &I Constant 2,002,556.35 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 264,688,902.23 Scheduled Principal 297,552.13 Unscheduled Principal 18,977,095.44 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 386,044.95 Miscellaneous Reporting Net WAC Rate Carryover Amount Class A-1 0.00 Net WAC Rate Carryover Amount Class B-1 0.00 Net WAC Rate Carryover Amount Class B-2 0.00 Net WAC Rate Carryover Amount Class M-1 0.00 Net WAC Rate Carryover Amount Class M-2 0.00 Three month rolling average 0.034450%