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) April 25, 2005

Structured Asset Securities Corporation (as Depositor under the Trust Agreement dated as of February 1, 2005, providing for the issuance of Structured Asset Securities Corporation Trust Mortgage Pass-Through Certificates, Series 2005-WMC1)
(Exact name of registrant as specified in its charter)

Delaware
(State or other jurisdiction
of incorporation)

333-120575
(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/A 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/A relates to the monthly distribution reported to the holders of Structured Asset Securities Corporation Mortgage Pass-Through Certificates, Series 2005-WMC1, which was made on April 25, 2005.

Section 9 - Financial Statements and Exhibits

Item 9.01 Financial Statements and Exhibits.

99.1 Monthly distribution report pursuant to sectrion 4.03 of the Trust Agreement for the distribution on April 25, 2005.

(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: June 17, 2005

Structured Asset Securities Corporation

Mortgage Pass-Through Certificates

Series 2005-WMC1

ABN AMRO Acct: 722446.3

Reporting Package Table of Contents

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

09-Jun-05

25-Apr-05

25-Mar-05

25-May-05

22-Apr-05

Administrator:

Peter Sablich 312.904.8162
peter.sablich@abnamro.com

Analyst:

Dinsmore Sohn 714.259.6258
dinsmore.sohn@abnamro.com

Revised Date:

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

Statements to Certificateholders
Cash Reconciliation Summary
Bond Interest Reconciliation
Bond Principal Reconciliation

Shortfall Summary Report

Swap Summary Report
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
Page 6

Page 7

Page 8
Page 9

Page 10
Page 11

Page 12

Substitution Detail History

Page 13

Page(s)

Information is available for this issue from the following sources

Issue Id:

Monthly Data File
Name:

SAS5WMC1

SAS5WMC1_200504_3.ZIP

Closing Date:

First Payment Date:

Rated Final Payment: Date:

11-Mar-05
25-Mar-05

25-Jan-35

Parties to The Transaction

Depositor: Structured Asset Securities Corporation

Underwriter: Lehman Brothers Inc.

Master Servicer: Aurora Loan Services LLC

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 13

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:

6.661258%

2.850000%
3.020000%

09-Jun-05

25-Apr-05

25-Mar-05

25-May-05

22-Apr-05

Structured Asset Securities Corporation

Mortgage Pass-Through Certificates

Series 2005-WMC1

Face Value (1)

Balance

Payment

Adj. or Loss

Amortization

Balance

Payment (2)

Adjustment

Rate

333

Distribution

Revised Date:

ABN AMRO Acct: 722446.3

943.176892583

43.649386041

0.000000000

899.527506542

2.379687685

3.1000000000%

0.00

0.000000000

2.9300000000%

0.000000000

86359B6D8

165,858,000.00

7,239,599.87

0.00

149,193,833.18

394,690.24

156,433,433.05

1000.000000000

0.000000000

1000.000000000

2.617777821

3.2100000000%

0.00

0.000000000

3.0400000000%

0.000000000

86359B6E6

77,442,000.00

0.00

77,442,000.00

202,725.95

77,442,000.00

1000.000000000

0.000000000

1000.000000000

2.729722140

3.3400000000%

0.00

0.000000000

3.1700000000%

0.000000000

86359B6F3

27,100,000.00

0.00

27,100,000.00

73,975.47

27,100,000.00

1000.000000000

0.000000000

1000.000000000

2.824444296

3.4500000000%

0.00

0.000000000

3.2800000000%

0.000000000

86359B6G1

22,449,000.00

0.00

22,449,000.00

63,405.95

22,449,000.00

1000.000000000

0.000000000

1000.000000000

3.056944291

3.7200000000%

0.00

0.000000000

3.5500000000%

0.000000000

86359B6H9

18,094,000.00

0.00

18,094,000.00

55,312.35

18,094,000.00

1000.000000000

0.000000000

1000.000000000

3.160278576

3.8400000000%

0.00

0.000000000

3.6700000000%

0.000000000

86359B6J5

4,523,000.00

0.00

4,523,000.00

14,293.94

4,523,000.00

1000.000000000

0.000000000

1000.000000000

3.616666667

4.3700000000%

0.00

0.000000000

4.2000000000%

0.000000000

86359B6K2

8,544,000.00

0.00

8,544,000.00

30,900.80

8,544,000.00

1000.000000000

0.000000000

1000.000000000

4.176389040

5.0200000000%

0.00

0.000000000

4.8500000000%

0.000000000

86359B6L0

3,686,000.00

0.00

3,686,000.00

15,394.17

3,686,000.00

1000.000000000

0.000000000

1000.000000000

4.606945225

5.5200000000%

0.00

286.55

0.050307233

5.2915804842%

0.000000000

86359B6M8

5,696,000.00

0.00

5,696,000.00

26,241.16

5,696,000.00

1000.000000000

0.000000000

1000.000000000

4.606943284

5.5200000000%

0.00

84.26

0.050304478

5.2915804842%

0.000000000

86359B6N6/U85985UA2

1,675,000.00

0.00

1,675,000.00

7,716.63

1,675,000.00

973.224854187

0.000000000

952.516183073

0.896644795

0.00

)

(301,177.71

)

(0.898858084

2.2138804313%

0.000000000

9ABSU337

335,067,031.67

0.00

319,156,770.08

300,436.11

326,095,563.04

1000.000000000

0.000000000

1000.000000000

1068982.400000000

0.00

106,898.24

1068982.400000000

N/A

0.000000000

9ABSU338

100.00

0.00

100.00

106,898.24

100.00

0.000000000

0.00

0.000000000

N/A

0.000000000

9ABSU341

0.00

Page 2 of 13

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:

6.661258%

2.850000%
3.020000%

09-Jun-05

25-Apr-05

25-Mar-05

25-May-05

22-Apr-05

Structured Asset Securities Corporation

Mortgage Pass-Through Certificates

Series 2005-WMC1

Face Value (1)

Balance

Payment

Adj. or Loss

Amortization

Balance

Payment (2)

Adjustment

Rate

333

Distribution

Revised Date:

ABN AMRO Acct: 722446.3

Total P&I Payment

0.00

)

(193,908.66

335,067,100.00

325,642,533.05

8,531,590.88

Total

318,402,933.18

7,239,599.87

0.00

1,291,991.01

Page 3 of 13

Structured Asset Securities Corporation

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

09-Jun-05

25-Apr-05

25-Mar-05

25-May-05

22-Apr-05

Mortgage Pass-Through Certificates

Series 2005-WMC1

ABN AMRO Acct: 722446.3

Revised Date:

Cash Reconciliation Summary

Overcollateralization Deficiency

Overcollateralization Amount

Current Scheduled Interest

Interest Summary

Less Deferred Interest

Plus Gross Advance Interest

Less PPIS Reducing Scheduled Int

1,712,059.07

0.00
0.00

Less Other Adjustment

0.00

Total
Unscheduled Interest:
Prepayment Penalties

106,898.24

Yield Maintenance Penalties

0.00

Other Interest Proceeds

0.00

Total

106,898.24

Less Fees & Expenses Paid By/To Servicer

Less Fee Paid To Servicer
Less Fee Strips Paid by Servicer

PMI Amounts

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
Credit Risk Manager's Fees
Misc. Fees

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

)

(83,598.86

0.00
0.00

0.00

)

(49,281.37

0.00
0.00
0.00

0.00

60,790.80

4,967.23

65,758.03

11,475.06

6,861,559.87

0.00
0.00
0.00

6,873,034.93
6,938,792.96

8,670,708.98

326,095,563.04

1,443

65,758.03

6,873,034.93

0.00
0.00

0.00

319,156,770.08

1,413

0.00

4,967.23

95,188.40

4,967.23

95,188.40

49,349.46

0.00

2,924.84

52,274.30

0.00
0.00
0.00
0.00
0.00
0.00

0.00

Advance Summary (Advance Made by Servicer)

)

(49,349.46

1,731,916.02

Interest Not Advanced (

Current Period

)

0.00

95,188.40

Less Non Recovered

0.00

0.00
0.00

0.00

753,936.90

3,735,207.91

Other Principal Information

Principal Remittance Amount
Overcollateralization Release Amount

6,938,792.96

0.00

6,938,792.96

Principal Distribution Amount

)

(49,281.37

1,807,247.46

1,731,916.02

Page 4 of 13

Structured Asset Securities Corporation

Class

Payment Date:

Prior Payment:

Next Payment:

Record Date:

09-Jun-05

25-Apr-05

25-Mar-05

25-May-05

22-Apr-05

Mortgage Pass-Through Certificates

Series 2005-WMC1

ABN AMRO Acct: 722446.3

Bond Interest Reconciliation

Additions

Accrual

Method Days

Revised Date:

Accrued

Certificate

Interest

Prior

Int Carry-Fwd

Shortfall

Prior

Shortfall

Reimbursement

Other

Interest

Proceeds

Other

Interest

Losses

Current

Int Carry-Fwd

Shortfall

Current Basis

Risk Carry-Fwd

Shortfall

Remaining

Int Carry-Fwd

Shortfall

Remaining Basis

Risk Carry-Fwd

Shortfall

Net Cap Rate

in Effect

Y/N

Distributable

Certificate

Interest

Payment

Amount

Deductions

Outstanding

Deposits from

YM Agreement

0.00

394,690.24

Act/360

0.00

394,690.24

0.00

202,725.95

Act/360

0.00

202,725.95

0.00

73,975.47

Act/360

0.00

73,975.47

0.00

63,405.95

Act/360

0.00

63,405.95

0.00

55,312.35

Act/360

0.00

55,312.35

0.00

14,293.94

Act/360

0.00

14,293.94

0.00

30,900.80

Act/360

0.00

30,900.80

0.00

15,394.17

Act/360

0.00

15,394.17

0.00

26,241.15

26,241.16

Act/360

0.00

25,954.61

0.00

Yes

0.00

286.54

0.00

7,716.63

Act/360

0.00

7,632.37

0.00

Yes

0.00

84.26

0.00

1,054,712.14

300,436.11

30/360

453,098.32

601,613.82

0.00

301,177.71

754,276.03

0.00

106,898.24

0.00

370.80

453,098.32

1,485,899.67

2,046,267.03

1,291,991.01

0.00

301,177.71

754,276.03

0.00

(2) Interest Carry-Forward Shortfall is unpaid interest with interest thereon
(3) Basis Risk Carry-Forward Shortfall - difference between LIBOR plus margin and the Net Rate Cap.

Page 5 of 13

(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:

09-Jun-05

25-Apr-05

25-Mar-05

25-May-05

22-Apr-05

Mortgage Pass-Through Certificates

Series 2005-WMC1

ABN AMRO Acct: 722446.3

Bond Principal Reconciliation

Credit Support

Original

Current(4)

Revised Date:

Beginning

Class Balance

Unscheduled

Principal
Payment

Extra

Principal

Payment Amt

Prior

Loss

Reimburs.

Rated

Final

Maturity

Class

Current

Losses

Original

Class Balance

Scheduled

Principal
Payment

Ending

Class Balance

Cumulative

Losses

Interest on

Losses

Additions

Losses

5.00
1.00

1/25/2035

149,193,833.18

0.00

156,433,433.05

165,858,000.00

7,239,599.87

0.00

1/25/2035

77,442,000.00

0.00

77,442,000.00

0.00

1/25/2035

27,100,000.00

0.00

27,100,000.00

0.00

1/25/2035

22,449,000.00

0.00

22,449,000.00

0.00

1/25/2035

18,094,000.00

0.00

18,094,000.00

0.00

1/25/2035

4,523,000.00

0.00

4,523,000.00

0.00

1/25/2035

8,544,000.00

0.00

8,544,000.00

0.00

1/25/2035

3,686,000.00

0.00

3,686,000.00

0.00

1/25/2035

5,696,000.00

0.00

5,696,000.00

0.00

1/25/2035

1,675,000.00

0.00

1,675,000.00

0.00

1/25/2035

319,156,770.08

0.00

326,095,563.04

335,067,031.67

0.00

1/25/2035

100.00

0.00

100.00

0.00

7,239,599.87

0.00

335,067,100.00

318,402,933.18

325,642,533.05

Page 6 of 13

(1) Extra Principal Amounts: the lessor of (i) the excess, if any, of the overcollateralization Target Amount over the Overcollateralization Amount.

Structured Asset Securities Corporation

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

09-Jun-05

25-Apr-05

25-Mar-05

25-May-05

22-Apr-05

Mortgage Pass-Through Certificates

Series 2005-WMC1

ABN AMRO Acct: 722446.3

Interest Adjustments Summary

Revised 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

106,898.24

106,898.24

Total Excess Allocated to the Bonds

106,898.24

0.00

Aggregate Interest Adjustment Allocated to the Bonds

0.00

106,898.24

0.00

Prepayment Interest Excess Due the Bonds

0.00

ARD Excess Interest

0.00

Net Prepayment Int. Shortfalls Allocated to the Bonds

Other Interest Loss

Interest Income

0.00

Page 7 of 13

Structured Asset Securities Corporation

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

09-Jun-05

25-Apr-05

25-Mar-05

25-May-05

22-Apr-05

Mortgage Pass-Through Certificates

Series 2005-WMC1

ABN AMRO Acct: 722446.3

SWAP Payments

Revised Date:

Net Swap payment payable to the Swap Counterparty.........................................................................

Net Swap payment payable to the Supplemental Interest Trust................................................................

Swap Termination payment payable to the Supplemental Interest Trust..............................................

Swap Termination payment payable to the Swap Counterparty...........................................................

0.00

139,118.10

0.00

Page 8 of 13

Structured Asset Securities Corporation

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

09-Jun-05

25-Apr-05

25-Mar-05

25-May-05

22-Apr-05

Mortgage Pass-Through Certificates

Series 2005-WMC1

ABN AMRO Acct: 722446.3

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

Distribution

Date

REO

# Balance

Revised Date:

Foreclosure

Delinq 3+ Months

Delinq 2 Months

Delinq 1 Month

Current

# Balance

Delinquency Aging Categories

0.21%

0.13%

0.07%

0.09%

0.00%

25-Apr-05

405,759

290,773

1,409

318,460,238

99.72%

99.78%

0.00%

25-Mar-05

1,443

326,095,563

100.00%

Page 9 of 13

Structured Asset Securities Corporation

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

09-Jun-05

25-Apr-05

25-Mar-05

25-May-05

22-Apr-05

Mortgage Pass-Through Certificates

Series 2005-WMC1

ABN AMRO Acct: 722446.3

Distribution

Date

Revised Date:

Current 31 - 60 Days 61 - 90 Days 90 + Days
# Balance # 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

Current

31 - 60 Days

61 - 90 Days

90 + Days

Balance

25-Apr-05

0.00%

0.00% 0.00%

0.00%

0.14%

0.16%

524,744

0.00%

25-Mar-05

0.00%

0.00% 0.00%

0.00%

0.14%

0.16%

524,788

0.00%

Page 10 of 13

Structured Asset Securities Corporation

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

09-Jun-05

25-Apr-05

25-Mar-05

25-May-05

22-Apr-05

Mortgage Pass-Through Certificates

Series 2005-WMC1

ABN AMRO Acct: 722446.3

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

Revised Date:

Ending Arrearage (1)

Balance

Insurance

Substitution

Liquidation

Proceeds

25-Apr-05

1,413

95.93%

319,156,770

95.25%

2.08%

2.10%

0.00%

333

6.66%

5.98%

6,861,560

0.00

25-Mar-05

1,443

97.96%

326,095,563

97.32%

2.04%

2.65%

0.00%

334

6.68%

6.00%

8,867,541

0.00

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

Page 11 of 13

Structured Asset Securities Corporation

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

09-Jun-05

25-Apr-05

25-Mar-05

25-May-05

22-Apr-05

Mortgage Pass-Through Certificates

Series 2005-WMC1

ABN AMRO Acct: 722446.3

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

Revised Date:

Current Total
Cumulative

Page 12 of 13

* 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: 722446.3

Series 2005-WMC1

Mortgage Pass-Through Certificates

22-Apr-05

25-May-05

25-Mar-05

25-Apr-05

09-Jun-05

Record Date:

Next Payment:

Prior Payment:

Payment Date:

Revised Date:

Property ID

Deleted Loan

Qualified Substitute

Scheduled Prin Bal

Page 13 of 13

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)

SASCO Mortgage Pass-Through Certifidates, Series 2005-WMC1 8-K/A