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) August 25, 2004

STRUCTURED ASSET SECURITIES CORPORATION (as Depositor under the Trust Agreement dated as of April 1, 2004, providing for the issuance of Structured Asset Securities Corporation Mortgage Pass-Through Certificates, Series 2004-9XS
(Exact name of registrant as specified in its charter)

Delaware
(State or other jurisdiction
of incorporation)

333-106925
(Commission
File Number)

74-2440850
(IRS Employer
Identification No.)

745 Seventh Avenue, 7th Floor, New York, NY
(Address of principal executive offices)

10019
(Zip Code)

Registrant's telephone number, including area code 212-526-7000

(Former name or former address, if changed since last report.)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions (see General Instruction A.2. below):

[ ] Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

[ ] Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

[ ] Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

[ ] Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Section 8 - Other Events

Item 8.01. Other Events.

This current report on Form 8-K relates to the monthly distribution reported to the holders of Structured Asset Securities Corporation Mortgage Pass-Through Certificates, Series 2004-9XS, which was made on August 25, 2004.

Section 9 - Financial Statements and Exhibits

Item 9.01 Financial Statements and Exhibits.

99.1 Monthly distribution report pursuant to Section 4.03 of the Trust Agreement for the distribution on August 25, 2004.

(Exhibit No. Description)

SIGNATURES

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.

LASALLE BANK NATIONAL ASSOCIATION, IN ITS CAPACITY AS TRUSTEE UNDER THE TRUST AGREEMENT ON BEHALF OF STRUCTURED ASSET SECURITIES CORPORATION, REGISTRANT

By: /s/ Russell Goldenberg
Russell Goldenberg
Group Senior Vice President

Date: August 30, 2004

Structured Asset Securities Corporation

Mortgage Pass-Through Certificates

Series 2004-9XS

ABN AMRO Acct: 721781.2

Reporting Package Table of Contents

Payment Date:
Prior Payment:
Next Payment:
Record Date:

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Administrator:
Christopher Lewis 312.904.7992
christopher.lewis@abnamro.com

Analyst:
Dinsmore Sohn 714.259.6258
dinsmore.sohn@abnamro.com

Statement Date:

135 S. LaSalle Street, Suite 1625
Chicago, IL 60603
USA

Statements to Certificateholders
Component Detail Report
Cash Reconciliation Summary
Bond Interest Reconciliation

Shortfall Summary Report

Other Related Information
Asset-Backed Facts ~ 15 Month Loan Status Summary Part I

Asset-Backed Facts ~ 15 Month Loan Status Summary Part II
Asset-Backed Facts ~ 15 Month Loan Payoff/Loss Summary
Realized Loss Detail

Page 2-3
Page 4
Page 5-7
Page 8

Page 9

Page 10
Page 11-13

Page 14-16
Page 17-19

Page 20-22

Substitution Detail History

Page 23

Page(s)

Information is available for this issue from the following sources

Issue Id:

Monthly Data File
Name:

SASC49XS

SASC49XS_200408_3.ZIP

Closing Date:

First Payment Date:

Rated Final Payment: Date:

30-Apr-04
25-May-04

25-May-34

Parties to The Transaction

Depositor: Structured Asset Securities Corporation

Underwriter: Lehman Brothers Inc.

Master Servicer: Aurora Loan Services, Inc.

Rating Agency: Standard & Poor's/Moody's Investors Service, Inc.

800.246.5761

LaSalle Factor Line

LaSalle Web Site

Servicer Web Site

www.alservices.com

www.etrustee.net

Page 1 of 23

Class

CUSIP

Original

Opening

Principal

Negative

Closing

Interest

Pass-Through

Per $ 1000

Next Rate(3)

WAC:
WAMM:
Current Index:
Next Index:

Payment Date:
Prior Payment:
Next Payment:
Record Date:

6.527747%

1.450000%
1.615000%

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Structured Asset Securities Corporation

Mortgage Pass-Through Certificates

Series 2004-9XS

Face Value (1)

Balance

Payment

Adj. or Loss

Amortization

Balance

Payment (2)

Adjustment

Rate

353

REMIC 3

Statement Date:

ABN AMRO Acct: 721781.2

847.981649569

43.994846218

0.000000000

803.986803351

1.102376162

1.725000000%

0.00

0.000000000

1.56000000%

0.000000000

86359BQV6

1-A1A

105,864,000.00

89,770,729.35

4,657,470.40

0.00

85,113,258.95

116,701.95

847.981649607

43.994846125

0.000000000

803.986803482

1.328504438

1.880000000%

0.00

0.000000000

1.88000000%

0.000000000

86359BQW4

1-A1B

29,407,000.00

24,936,596.37

1,293,756.44

0.00

23,642,839.93

39,067.33

1000.000000000

0.000000000

1000.000000000

2.700000000

3.240000000%

0.00

0.000000000

3.24000000%

0.000000000

86359BQY0

1-A2A

20,904,500.00

0.00

20,904,500.00

56,442.15

1000.000000000

0.000000000

1000.000000000

2.641666627

3.170000000%

0.00

0.000000000

3.17000000%

0.000000000

86359BQZ7

1-A2B

20,904,500.00

0.00

20,904,500.00

55,222.72

1000.000000000

0.000000000

1000.000000000

4.708333500

5.650000000%

0.00

0.000000000

5.65000000%

0.000000000

86359BQX2

1-A3A

20,000,000.00

0.00

20,000,000.00

94,166.67

1000.000000000

0.000000000

1000.000000000

3.616666486

4.340000000%

0.00

0.000000000

4.34000000%

0.000000000

86359BRA1

1-A3B

18,413,000.00

0.00

18,413,000.00

66,593.68

1000.000000000

0.000000000

1000.000000000

4.633333443

5.560000000%

0.00

0.000000000

5.56000000%

0.000000000

86359BRB9

1-A4A

30,500,000.00

0.00

30,500,000.00

141,316.67

1000.000000000

0.000000000

1000.000000000

4.558333124

5.470000000%

0.00

0.000000000

5.47000000%

0.000000000

86359BRH6

1-A4B

15,946,000.00

0.00

15,946,000.00

72,687.18

1000.000000000

0.000000000

1000.000000000

4.583333333

5.500000000%

0.00

0.000000000

5.50000000%

0.000000000

86359BRJ2

1-A4C

7,500,000.00

0.00

7,500,000.00

34,375.00

1000.000000000

0.000000000

1000.000000000

4.508333000

5.410000000%

0.00

0.000000000

5.41000000%

0.000000000

86359BRK9

1-A4D

10,000,000.00

0.00

10,000,000.00

45,083.33

1000.000000000

0.000000000

1000.000000000

4.683333219

5.620000000%

0.00

0.000000000

5.62000000%

0.000000000

86359BRC7

1-A5

29,149,000.00

0.00

29,149,000.00

136,514.48

1000.000000000

0.000000000

1000.000000000

4.200000000

5.040000000%

0.00

0.000000000

5.04000000%

0.000000000

86359BRD5

1-A6

34,288,000.00

0.00

34,288,000.00

144,009.60

940.146820391

4.976698134

0.000000000

935.170122258

3.525550569

4.500000000%

0.00

0.000000000

4.50000000%

0.000000000

86359BRE3

2-A1

109,850,000.00

103,275,128.22

546,690.29

0.00

102,728,437.93

387,281.73

1000.000000000

0.000000000

1000.000000000

4.691666333

5.630000000%

0.00

0.000000000

5.63000000%

0.000000000

86359BRF0

1-M1

10,004,000.00

0.00

10,004,000.00

46,935.43

1000.000000000

0.000000000

1000.000000000

5.000000000

6.000000000%

0.00

0.000000000

6.00000000%

0.000000000

86359BRG8

1-M2

7,276,000.00

0.00

7,276,000.00

36,380.00

1000.000000000

0.000000000

1000.000000000

4.166666667

5.000000000%

0.00

0.000000000

5.00000000%

0.000000000

86359BRP8

2-M1

2,301,000.00

0.00

2,301,000.00

9,587.50

Page 2 of 23

Notes: (1) N denotes notional balance not included in total (2) Accrued Interest Plus/Minus Interest Adjustment Minus Deferred Interest equals Interest Payment (3) Estimated. * Denotes Controlling Class

Class

CUSIP

Original

Opening

Principal

Negative

Closing

Interest

Pass-Through

Per $ 1000

Next Rate(3)

WAC:
WAMM:
Current Index:
Next Index:

Payment Date:
Prior Payment:
Next Payment:
Record Date:

6.527747%

1.450000%
1.615000%

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Structured Asset Securities Corporation

Mortgage Pass-Through Certificates

Series 2004-9XS

Face Value (1)

Balance

Payment

Adj. or Loss

Amortization

Balance

Payment (2)

Adjustment

Rate

353

REMIC 3

Statement Date:

ABN AMRO Acct: 721781.2

1000.000000000

0.000000000

1000.000000000

4.375002899

5.250000000%

0.00

0.000000000

5.25000000%

0.000000000

86359BRQ6

2-M2

1,725,000.00

0.00

1,725,000.00

7,546.88

1000.000000000

0.000000000

1000.000000000

4.375000000

0.00

0.000000000

5.25000000%

0.000000000

86359BRR4

4,790,000.00

0.00

4,790,000.00

20,956.25

1000.000000000

0.000000000

1000.000000000

500996.200000000

0.00

50,099.62

500996.200000000

N/A

0.000000000

9ABSQ599

100.00

0.00

100.00

50,099.62

946.773830476

0.000000000

933.249686905

1.738546717

0.00

)

(22,246.09

)

(0.046459944

2.26242839%

0.000000000

9ABSQ600

478,823,003.19

453,337,088.85

0.00

446,861,417.81

832,456.16

0.000000000

0.00

0.000000000

N/A

0.000000000

9ABSQ601

0.00

0.000000000

0.00

0.000000000

N/A

0.000000000

LT1-R

0.00

0.000000000

0.00

0.000000000

N/A

0.000000000

LT2-R

0.00

Total P&I Payment

0.00

27,853.53

478,822,100.00

451,683,553.94

8,891,341.46

Total

445,185,636.81

6,497,917.13

0.00

2,393,424.33

Page 3 of 23

Class

CUSIP

Original

Opening

Principal

Negative

Closing

Interest

Pass-Through

Per $ 1000

Next Rate(3)

Payment Date:
Prior Payment:
Next Payment:
Record Date:

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Structured Asset Securities Corporation

Mortgage Pass-Through Certificates

Series 2004-9XS

ABN AMRO Acct: 721781.2

Face Value (1)

Balance

Payment

Adj. or Loss

Amortization

Balance

Payment (2)

Adjustment

Rate

Statement Date:

Component Detail

1000.000000000

0.000000000

1000.000000000

4.375001375

0.00

0.000000000

5.25000000%

0.000000000

M3(1)

3,637,000.00

0.00

3,637,000.00

15,911.88

1000.000000000

0.000000000

1000.000000000

4.375004337

0.00

0.000000000

5.25000000%

0.000000000

M3(2)

1,153,000.00

0.00

1,153,000.00

5,044.38

Page 4 of 23

Structured Asset Securities Corporation

Payment Date:
Prior Payment:
Next Payment:
Record Date:

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Mortgage Pass-Through Certificates

Series 2004-9XS

ABN AMRO Acct: 721781.2

Statement Date:

Cash Reconciliation Summary

Current Scheduled Interest

Interest Summary

Less Deferred Interest

Plus Gross Advance Interest

Less PPIS Reducing Scheduled Int

641,510.86

0.00
0.00

Less ASER Interest Adv Reduction

0.00

Less Other Adjustment

0.00

Total

2,396,780.20

Unscheduled Interest:
Prepayment Penalties

50,099.62

Yield Maintenance Penalties

0.00

Other Interest Proceeds

0.00

Total

50,099.62

Less Fees & Expenses Paid By/To Servicer

Less Fee Paid To Servicer
Less Fee Strips Paid by Servicer

Special Servicing Fees

Interest Due Serv on Advances

Recoup of Prior Advances

Misc. Fees & Expenses

Total Unscheduled Fees & Expenses
Total Interest Due Trust

Less Fees & Expenses Paid By/To Trust
Trustee Fee
Fee Strips
Misc. Fees
Interest Reserve Withholding

Plus Interest Reserve Deposit
Total

Total Interest Due Certs

Principal Summary

Scheduled Principal:
Current Scheduled Principal
Advanced Scheduled Principal
Scheduled Principal
Unscheduled Principal:
Curtailments
Prepayments in Full
Liquidation Proceeds
Repurchase Proceeds
Other Principal Proceeds
Total Unscheduled Principal
Remittance Principal

Remittance P&I Due Trust

Remittance P&I Due Certs

Pool Balance Summary

Beginning Pool
Scheduled Principal
Unscheduled Principal
Deferred Interest
Liquidations
Repurchases

Ending Pool

Balance

Count

Principal

Interest

Prior Outstanding
Plus Current Period
Less Recovered

Ending Outstanding

Servicing Fee Summary

Current Servicing Fees
Plus Fees Advanced for PPIS
Less Reduction for PPIS
Plus Delinquent Servicing Fees

Total Servicing Fees

Overcollateralization Summary

PPIS Summary

Gross PPIS
Reduced by PPIE
Reduced by Shortfalls in Fees
Reduced by Other Amounts

PPIS Reducing Scheduled
Interest

PPIS Reducing Servicing Fee
PPIS Due Certificate

0.00

0.00
0.00

0.00

2,421,664.44

0.00
0.00
0.00
0.00

0.00

75,437.55

227,946.85
303,384.40

62,571.30

6,109,715.34

0.00
0.00
0.00

6,172,286.64
6,475,671.04

8,897,335.48

453,337,088.85

1,896

303,384.40

6,172,286.64

0.00
0.00

0.00

446,861,417.81

1,868

247,713.54

1,952,393.71

227,946.85

1,755,269.34

240,415.04

1,879,816.11

25,215.38

0.00
0.00

69,278.17

94,493.54

0.00
0.00
0.00
0.00
0.00
0.00

0.00

Advance Summary (Advance Made by Servicer)

)

(25,215.38

2,421,664.44

Interest Not Advanced (

Current Period

)

0.00

1,755,269.34

Workout Fees
Liquidation Fees

0.00
0.00

Less Non Recovered

)

(1,827,846.94

)

(235,245.35

0.00

Overcollateralization Amount

Overcollateralization Deficiency

1,675,881.00

0.00

Other Principal Information

Principal Remittance Amount

Overcollateralization Release Amount

6,475,671.04

0.00

6,475,671.04

Principal Distribution Amount

Page 5 of 23

Structured Asset Securities Corporation

Payment Date:
Prior Payment:
Next Payment:
Record Date:

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Mortgage Pass-Through Certificates

Series 2004-9XS

ABN AMRO Acct: 721781.2

Statement Date:

Cash Reconciliation Summary Pool 1

Current Scheduled Interest

Interest Summary

Less Deferred Interest

Plus Gross Advance Interest

Less PPIS Reducing Scheduled Int

448,471.38

0.00
0.00

Less ASER Interest Adv Reduction

0.00

Less Other Adjustment

0.00

Total

1,877,355.22

Unscheduled Interest:
Prepayment Penalties

39,459.71

Yield Maintenance Penalties

0.00

Other Interest Proceeds

0.00

Total

39,459.71

Less Fees & Expenses Paid By/To Servicer

Less Fee Paid To Servicer
Less Fee Strips Paid by Servicer

Special Servicing Fees

Interest Due Serv on Advances

Recoup of Prior Advances

Misc. Fees & Expenses

Total Unscheduled Fees & Expenses
Total Interest Due Trust

Less Fees & Expenses Paid By/To Trust
Trustee Fee
Fee Strips
Misc. Fees
Interest Reserve Withholding

Plus Interest Reserve Deposit
Total

Total Interest Due Certs

Principal Summary

Remittance P&I Due Trust

Remittance P&I Due Certs

Pool Balance Summary

Beginning Pool
Scheduled Principal
Unscheduled Principal
Deferred Interest
Liquidations
Repurchases

Ending Pool

Balance

Count

Principal

Interest

Prior Outstanding
Plus Current Period
Less Recovered

Ending Outstanding

Servicing Fee Summary

Current Servicing Fees
Plus Fees Advanced for PPIS
Less Reduction for PPIS
Plus Delinquent Servicing Fees

Total Servicing Fees

Overcollateralization Summary

PPIS Summary

Gross PPIS
Reduced by PPIE
Reduced by Shortfalls in Fees
Reduced by Other Amounts

PPIS Reducing Scheduled
Interest

PPIS Reducing Servicing Fee
PPIS Due Certificate

0.00

0.00
0.00

0.00

1,899,852.08

0.00
0.00
0.00
0.00

0.00

49,560.12

181,159.70
230,719.82

49,936.66

5,670,570.36

0.00
0.00
0.00

5,720,507.02
5,951,226.84

7,851,078.92

344,502,602.72

1,698

230,719.82

5,720,507.02

0.00
0.00

0.00

338,551,375.88

1,671

200,683.43

1,611,030.41

181,159.70

1,428,883.84

192,537.59

1,548,346.92

16,962.85

0.00
0.00

54,856.85

71,819.69

0.00
0.00
0.00
0.00
0.00
0.00

0.00

Advance Summary (Advance Made by Servicer)

)

(16,962.85

1,899,852.08

Interest Not Advanced (

Current Period

)

0.00

1,428,883.84

Workout Fees
Liquidation Fees

0.00
0.00

Less Non Recovered

)

(1,491,567.33

)

(189,305.54

0.00

Overcollateralization Amount

Overcollateralization Deficiency

1,273,277.00

0.00

Other Principal Information

Principal Remittance Amount

Overcollateralization Release Amount

5,951,226.84

0.00

5,951,226.84

Principal Distribution Amount

Page 6 of 23

Structured Asset Securities Corporation

Payment Date:
Prior Payment:
Next Payment:
Record Date:

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Mortgage Pass-Through Certificates

Series 2004-9XS

ABN AMRO Acct: 721781.2

Statement Date:

Cash Reconciliation Summary Pool 2

Current Scheduled Interest

Interest Summary

Less Deferred Interest

Plus Gross Advance Interest

Less PPIS Reducing Scheduled Int

193,039.48

0.00
0.00

Less ASER Interest Adv Reduction

0.00

Less Other Adjustment

0.00

Total

519,424.98

Unscheduled Interest:
Prepayment Penalties

10,639.91

Yield Maintenance Penalties

0.00

Other Interest Proceeds

0.00

Total

10,639.91

Less Fees & Expenses Paid By/To Servicer

Less Fee Paid To Servicer
Less Fee Strips Paid by Servicer

Special Servicing Fees

Interest Due Serv on Advances

Recoup of Prior Advances

Misc. Fees & Expenses

Total Unscheduled Fees & Expenses
Total Interest Due Trust

Less Fees & Expenses Paid By/To Trust
Trustee Fee
Fee Strips
Misc. Fees
Interest Reserve Withholding

Plus Interest Reserve Deposit
Total

Total Interest Due Certs

Principal Summary

Remittance P&I Due Trust

Remittance P&I Due Certs

Pool Balance Summary

Beginning Pool
Scheduled Principal
Unscheduled Principal
Deferred Interest
Liquidations
Repurchases

Ending Pool

Balance

Count

Principal

Interest

Prior Outstanding
Plus Current Period
Less Recovered

Ending Outstanding

Servicing Fee Summary

Current Servicing Fees
Plus Fees Advanced for PPIS
Less Reduction for PPIS
Plus Delinquent Servicing Fees

Total Servicing Fees

Overcollateralization Summary

PPIS Summary

Gross PPIS
Reduced by PPIE
Reduced by Shortfalls in Fees
Reduced by Other Amounts

PPIS Reducing Scheduled
Interest

PPIS Reducing Servicing Fee
PPIS Due Certificate

0.00

0.00
0.00

0.00

521,812.36

0.00
0.00
0.00
0.00

0.00

25,877.43
46,787.15
72,664.58

12,634.64

439,144.98

0.00
0.00
0.00

451,779.62
524,444.20

1,046,256.56

108,834,486.13

198

72,664.58

451,779.62

0.00
0.00

0.00

108,310,041.93

197

47,030.11

341,363.29

46,787.15

326,385.50

47,877.45

331,469.19

8,252.53

0.00
0.00

14,421.32

22,673.85

0.00
0.00
0.00
0.00
0.00
0.00

0.00

Advance Summary (Advance Made by Servicer)

)

(8,252.53

521,812.36

Interest Not Advanced (

Current Period

)

0.00

326,385.50

Workout Fees
Liquidation Fees

0.00
0.00

Less Non Recovered

)

(336,279.61

)

(45,939.81

0.00

Overcollateralization Amount

Overcollateralization Deficiency

402,604.00

0.00

Other Principal Information

Principal Remittance Amount

Overcollateralization Release Amount

524,444.20

0.00

524,444.20

Principal Distribution Amount

Page 7 of 23

Structured Asset Securities Corporation

Class

Accrued

Payment Date:
Prior Payment:
Next Payment:
Record Date:

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Mortgage Pass-Through Certificates

Series 2004-9XS

ABN AMRO Acct: 721781.2

Bond Interest Reconciliation

Prior

Other

Additions

Interest

Losses

Current

Cumulative

Accrual

Risk Carry-

Fwd Amt

Interest

Payment

Amount

Interest

Certificate

Interest

Losses

Shortfall

Int. Carry-

Proceeds

Risk Carry-

Certificate

Agreement

Amt Deposited

From YM

Method Days

Basis

Remaining

Statement Date:

Distributable

Prior

Applied Realized

Remaining

Int. Carry-

forward Amt

Principal

Extra

Prepayments

Shortfalls

Net

Cap

Rate
Y/N

0.00

1-A1A

116,701.95

0.00

116,701.95

Act/360

0.00

1-A1B

39,067.33

0.00

39,067.33

30/360

0.00

1-A2A

56,442.15

0.00

56,442.15

30/360

0.00

1-A2B

55,222.72

0.00

55,222.72

30/360

0.00

1-A3A

94,166.67

0.00

94,166.67

30/360

0.00

1-A3B

66,593.68

0.00

66,593.68

30/360

0.00

1-A4A

141,316.67

0.00

141,316.67

30/360

0.00

1-A4B

72,687.18

0.00

72,687.18

30/360

0.00

1-A4C

34,375.00

0.00

34,375.00

30/360

0.00

1-A4D

45,083.33

0.00

45,083.33

30/360

0.00

1-A5

136,514.48

0.00

136,514.48

30/360

0.00

1-A6

144,009.60

0.00

144,009.60

30/360

0.00

2-A1

387,281.73

0.00

387,281.73

30/360

0.00

1-M1

46,935.43

0.00

46,935.43

30/360

0.00

1-M2

36,380.00

0.00

36,380.00

30/360

0.00

2-M1

9,587.50

0.00

9,587.50

30/360

0.00

2-M2

7,546.88

0.00

7,546.88

30/360

0.00

20,956.25

0.00

20,956.25

30/360

0.00

50,099.62

30/360

0.00

854,702.25

1,652,631.72

2,507,333.97

832,456.16

30/360

0.00

1,674,877.81

0.00

1,652,631.72

2,365,570.80

4,068,302.14

2,393,424.33

0.00

1,674,877.81

0.00

(2) Principal Prepayments include the Extra Principal Amount

Page 8 of 23

(1) Other Interest Proceeds are additional interest amounts specifically allocated to the bond(s) and used in determining the bonds Distributable Interest.

Structured Asset Securities Corporation

Payment Date:
Prior Payment:
Next Payment:
Record Date:

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Mortgage Pass-Through Certificates

Series 2004-9XS

ABN AMRO Acct: 721781.2

Interest Adjustments Summary

Statement Date:

0.00

Special Servicing Fees

Workout Fees

Liquidation Fees

Legal Fees

0.00

Misc. Fees & Expenses Paid by/to Servicer

Interest Paid to Servicer on Outstanding Advances

0.00

ASER Interest Advance Reduction

Interest Not Advanced (Current Period)

Recoup of Prior Advances by Servicer

0.00

Servicing Fees Paid Servicer on Loans Not Advanced

Misc. Fees & Expenses Paid by Trust

0.00

Shortfall Due to Rate Modification

Total Shortfall Allocated to the Bonds

Total Interest Adjustment to the Bonds

0.00

Shortfall Allocated to the Bonds:

Excess Allocated to the Bonds:

Other Interest Proceeds Due the Bonds

Yield Maintenance Penalties Due the Bonds

Prepayment Penalties Due the Bonds

Recovered ASER Interest Due the Bonds

Recovered Interest Due the Bonds

Less Total Shortfall Allocated to the Bonds

Total Excess Allocated to the Bonds

50,099.62

50,099.62

Total Excess Allocated to the Bonds

50,099.62

0.00

Aggregate Interest Adjustment Allocated to the Bonds

0.00

50,099.62

0.00

Prepayment Interest Excess Due the Bonds

0.00

ARD Excess Interest

0.00

Other Interest Loss

0.00

Net Prepayment Int. Shortfalls Allocated to the Bonds

Page 9 of 23

Structured Asset Securities Corporation

Payment Date:
Prior Payment:
Next Payment:
Record Date:

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Mortgage Pass-Through Certificates

Series 2004-9XS

ABN AMRO Acct: 721781.2

Other Related Information

Statement Date:

$5,994.01

Insurance Premium......................................................................................................................

Insured Payments to Class:

I-A2B............................................................................................................................

I-A3B...............................................................................................................................

I-A5...................................................................................................................................

I-A6..................................................................................................................................

0.00

Page 10 of 23

Structured Asset Securities Corporation

Payment Date:
Prior Payment:
Next Payment:
Record Date:

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Mortgage Pass-Through Certificates

Series 2004-9XS

ABN AMRO Acct: 721781.2

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part I

Distribution

Date

REO

Balance

Statement Date:

Foreclosure

Delinq 3+ Months

Delinq 2 Months

Delinq 1 Month

Current

Balance

Delinquency Aging Categories

2.25%

2.46%

0.70%

0.56%

0.27%

1,703,511

0.38%

0.16%

0.06%

0.00%

25-Aug-04

10,973,440

2,484,623

285,289

1,805

431,414,556

96.63%

96.54%

2.37%

1.74%

0.58%

0.65%

0.05%

116,608

0.03%

0.00%

26-Jul-04

7,901,946

2,947,840

1,839

442,370,694

96.99%

97.58%

2.55%

2.12%

0.21%

0.19%

0.05%

116,675

0.03%

0.00%

25-Jun-04

9,746,807

866,177

1,871

448,918,894

97.19%

97.67%

0.20%

0.21%

0.00%

25-May-04

1,002,935

1,953

467,017,019

99.80%

99.79%

Page 11 of 23

Structured Asset Securities Corporation

Payment Date:
Prior Payment:
Next Payment:
Record Date:

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Mortgage Pass-Through Certificates

Series 2004-9XS

ABN AMRO Acct: 721781.2

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part I

Distribution

Date

REO

Balance

Statement Date:

Foreclosure

Delinq 3+ Months

Delinq 2 Months

Delinq 1 Month

Current

Balance

Delinquency Aging Categories

Pool 1

2.45%

3.13%

0.72%

0.63%

0.30%

1,703,511

0.50%

0.18%

0.08%

0.00%

25-Aug-04

10,612,924

2,135,841

285,289

1,610

323,813,812

96.35%

95.65%

2.59%

2.19%

0.65%

0.86%

0.06%

116,608

0.03%

0.00%

26-Jul-04

7,552,817

2,947,840

1,642

333,885,337

96.70%

96.92%

2.84%

2.78%

0.23%

0.25%

0.06%

116,675

0.03%

0.00%

25-Jun-04

9,746,807

866,177

1,673

339,998,565

96.87%

96.94%

0.23%

0.28%

0.00%

25-May-04

1,002,935

1,755

357,063,190

99.77%

99.72%

Page 12 of 23

Structured Asset Securities Corporation

Payment Date:
Prior Payment:
Next Payment:
Record Date:

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Mortgage Pass-Through Certificates

Series 2004-9XS

ABN AMRO Acct: 721781.2

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part I

Distribution

Date

REO

Balance

Statement Date:

Foreclosure

Delinq 3+ Months

Delinq 2 Months

Delinq 1 Month

Current

Balance

Delinquency Aging Categories

Pool 2

0.51%

0.33%

0.51%

0.32%

0.00%

25-Aug-04

360,516

348,783

195

107,600,743

98.98%

99.35%

0.51%

0.32%

0.00%

26-Jul-04

349,129

197

108,485,358

99.49%

99.68%

0.00%

25-Jun-04

198

108,920,329

100.00%

0.00%

25-May-04

198

109,953,829

100.00%

Page 13 of 23

Structured Asset Securities Corporation

Payment Date:
Prior Payment:
Next Payment:
Record Date:

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Mortgage Pass-Through Certificates

Series 2004-9XS

ABN AMRO Acct: 721781.2

Distribution

Date

Statement Date:

Current 31 - 60 Days 61 - 90 Days

90 + Days

# Balance # Balance # Balance

# Balance

Current 31 - 60 Days 61 - 90 Days

90 + Days

# Balance # Balance # Balance

# Balance

Current 31 - 60 Days 61 - 90 Days

90 + Days

# Balance # Balance

# Balance

In Foreclosure and Delinquent

In Bankruptcy and Delinquent

In REO and Delinquent

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part II

25-Aug-04

285,289

0.00%

0.16%

0.06%

0.00%

0.00% 0.00%

0.00%

0.11%

0.04%

170,383

0.00%

26-Jul-04

0.00%

0.00% 0.00%

0.00%

25-Jun-04

0.00%

0.00% 0.00%

0.00%

25-May-04

0.00%

0.00% 0.00%

0.00%

Page 14 of 23

Structured Asset Securities Corporation

Payment Date:
Prior Payment:
Next Payment:
Record Date:

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Mortgage Pass-Through Certificates

Series 2004-9XS

ABN AMRO Acct: 721781.2

Distribution

Date

Statement Date:

Current 31 - 60 Days 61 - 90 Days

90 + Days

# Balance # Balance # Balance

# Balance

Current 31 - 60 Days 61 - 90 Days

90 + Days

# Balance # Balance # Balance

# Balance

Current 31 - 60 Days 61 - 90 Days

90 + Days

# Balance # Balance

# Balance

In Foreclosure and Delinquent

In Bankruptcy and Delinquent

In REO and Delinquent

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part II - Pool 1

25-Aug-04

285,289

0.00%

0.18%

0.08%

0.00%

0.00% 0.00%

0.00%

0.12%

0.05%

170,383

0.00%

26-Jul-04

0.00%

0.00% 0.00%

0.00%

25-Jun-04

0.00%

0.00% 0.00%

0.00%

25-May-04

0.00%

0.00% 0.00%

0.00%

Page 15 of 23

Structured Asset Securities Corporation

Payment Date:
Prior Payment:
Next Payment:
Record Date:

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Mortgage Pass-Through Certificates

Series 2004-9XS

ABN AMRO Acct: 721781.2

Distribution

Date

Statement Date:

Current 31 - 60 Days 61 - 90 Days

90 + Days

# Balance # Balance # Balance

# Balance

Current 31 - 60 Days 61 - 90 Days

90 + Days

# Balance # Balance # Balance

# Balance

Current 31 - 60 Days 61 - 90 Days

90 + Days

# Balance # Balance

# Balance

In Foreclosure and Delinquent

In Bankruptcy and Delinquent

In REO and Delinquent

Asset-Backed Facts ~ 15 Month Historical Loan Status Summary Part II - Pool 2

25-Aug-04

0.00%

0.00% 0.00%

0.00%

26-Jul-04

0.00%

0.00% 0.00%

0.00%

25-Jun-04

0.00%

0.00% 0.00%

0.00%

25-May-04

0.00%

0.00% 0.00%

0.00%

Page 16 of 23

Structured Asset Securities Corporation

Payment Date:
Prior Payment:
Next Payment:
Record Date:

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Mortgage Pass-Through Certificates

Series 2004-9XS

ABN AMRO Acct: 721781.2

Asset-Backed Facts ~ 15 Month Historical Payoff/Loss Summary

Distribution

Date

Ending Pool (1)

Payoffs(2)

Realized Losses (2)

Remaining Term

Curr Weighted Avg.

# Balance

# Amount

Life

Coupon Remit

Statement Date:

Ending Arrearage (1)

Balance

Insurance

Substitution

Liquidation

Proceeds

25-Aug-04

1,868

94.06%

446,861,418

93.32%

1.48%

1.35%

0.00%

353

6.53%

6.28%

6,109,715

0.00

26-Jul-04

1,896

95.47%

453,337,089

94.68%

1.51%

1.27%

0.00%

354

6.53%

6.28%

5,841,628

0.00

25-Jun-04

1,925

96.93%

459,648,554

96.00%

0.05%

0.01%

0.00%

355

6.54%

6.29%

28,768

0.00

25-May-04

1,957

98.54%

468,019,954

97.74%

1.46%

2.19%

0.00%

356

6.54%

6.29%

10,470,952

0.00

(1) Percentage based on pool as of cutoff. (2) Percentage based on pool as of beginning of period.

Page 17 of 23

Structured Asset Securities Corporation

Payment Date:
Prior Payment:
Next Payment:
Record Date:

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Mortgage Pass-Through Certificates

Series 2004-9XS

ABN AMRO Acct: 721781.2

Asset-Backed Facts ~ 15 Month Historical Payoff/Loss Summary

Distribution

Date

Ending Pool (1)

Payoffs(2)

Realized Losses (2)

Remaining Term

Curr Weighted Avg.

# Balance

# Amount

Life

Coupon Remit

Statement Date:

Ending Arrearage (1)

Balance

Insurance

Substitution

Liquidation

Proceeds

Pool 1

25-Aug-04

1,641

82.63%

332,756,160

69.49%

1.56%

1.52%

0.00%

353

6.72%

6.47%

5,144,038

0.00

26-Jul-04

1,667

83.94%

338,176,370

70.63%

1.71%

1.70%

0.00%

354

6.73%

6.48%

5,841,628

0.00

25-Jun-04

1,696

85.40%

344,397,046

71.93%

0.06%

0.01%

0.00%

355

6.73%

6.48%

28,768

0.00

25-May-04

1,727

86.96%

351,482,595

73.41%

1.43%

1.53%

0.00%

356

6.73%

6.48%

5,465,951

0.00

(1) Percentage based on pool as of cutoff. (2) Percentage based on pool as of beginning of period.

Page 18 of 23

Structured Asset Securities Corporation

Payment Date:
Prior Payment:
Next Payment:
Record Date:

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Mortgage Pass-Through Certificates

Series 2004-9XS

ABN AMRO Acct: 721781.2

Asset-Backed Facts ~ 15 Month Historical Payoff/Loss Summary

Distribution

Date

Ending Pool (1)

Payoffs(2)

Realized Losses (2)

Remaining Term

Curr Weighted Avg.

# Balance

# Amount

Life

Coupon Remit

Statement Date:

Ending Arrearage (1)

Balance

Insurance

Substitution

Liquidation

Proceeds

Pool 2

25-Aug-04

197

9.92%

108,310,042

22.62%

0.51%

0.40%

0.00%

352

5.89%

5.64%

439,145

0.00

26-Jul-04

198

9.97%

108,834,486

22.73%

0.00%

355

5.89%

5.64%

0.00

25-Jun-04

198

9.97%

108,920,329

22.75%

0.00%

354

5.89%

5.64%

0.00

25-May-04

198

9.97%

109,953,829

22.96%

1.98%

4.35%

0.00%

358

5.90%

5.65%

5,005,001

0.00

(1) Percentage based on pool as of cutoff. (2) Percentage based on pool as of beginning of period.

Page 19 of 23

Structured Asset Securities Corporation

Payment Date:
Prior Payment:
Next Payment:
Record Date:

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Mortgage Pass-Through Certificates

Series 2004-9XS

ABN AMRO Acct: 721781.2

Realized Loss Detail

Period

Disclosure

Control #

Appraisal

Date

Appraisal

Value

Beginning
Scheduled

Balance

Gross

Proceeds

Gross Proceeds

as a % of

Sched. Balance

Aggregate

Liquidation

Expenses *

Net

Liquidation

Proceeds

Net Proceeds

as a % of

Sched. Balance

Realized

Loss

Statement Date:

Current Total
Cumulative

Page 20 of 23

* Aggregate liquidation expenses also include outstanding P&I advances and unpaid servicing fees, unpaid trustee fees, etc..

Structured Asset Securities Corporation

Payment Date:
Prior Payment:
Next Payment:
Record Date:

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Mortgage Pass-Through Certificates

Series 2004-9XS

ABN AMRO Acct: 721781.2

Realized Loss Detail

Period

Disclosure

Control #

Appraisal

Date

Appraisal

Value

Beginning
Scheduled

Balance

Gross

Proceeds

Gross Proceeds

as a % of

Sched. Balance

Aggregate

Liquidation

Expenses *

Net

Liquidation

Proceeds

Net Proceeds

as a % of

Sched. Balance

Realized

Loss

Statement Date:

Pool 1

Current Total
Cumulative

Page 21 of 23

* Aggregate liquidation expenses also include outstanding P&I advances and unpaid servicing fees, unpaid trustee fees, etc..

Structured Asset Securities Corporation

Payment Date:
Prior Payment:
Next Payment:
Record Date:

25-Aug-04
25-Aug-04

26-Jul-04

27-Sep-04

24-Aug-04

Mortgage Pass-Through Certificates

Series 2004-9XS

ABN AMRO Acct: 721781.2

Realized Loss Detail

Period

Disclosure

Control #

Appraisal

Date

Appraisal

Value

Beginning
Scheduled

Balance

Gross

Proceeds

Gross Proceeds

as a % of

Sched. Balance

Aggregate

Liquidation

Expenses *

Net

Liquidation

Proceeds

Net Proceeds

as a % of

Sched. Balance

Realized

Loss

Statement Date:

Pool 2

Current Total
Cumulative

Page 22 of 23

* Aggregate liquidation expenses also include outstanding P&I advances and unpaid servicing fees, unpaid trustee fees, etc..

Structured Asset Securities Corporation

Substitution Detail History

ABN AMRO Acct: 721781.2

Series 2004-9XS

Mortgage Pass-Through Certificates

24-Aug-04

27-Sep-04

26-Jul-04

25-Aug-04

Record Date:

Next Payment:

Prior Payment:

Payment Date:

Statement Date:

Property ID

Deleted Loan

Qualified Substitute

Scheduled Prin Bal

Page 23 of 23

Original Property

Per Section 7.01(a)(i) of the Property Management and Lease Servicing Agreement, aggregate Appraised Value of the Qualified Substitute Mortgaged Properties acquired by the
Issuer since the Closing Date in connection with the substitution or exchange pursuant to Section 7.01 is not to exceed 25% of the aggregate Initial Appraised Value of the
Mortgaged Properties.

(A)

Structured Asset Securities Corp Mortgage Pass-through Certificates 2004-9XS 8-K