As filed with the Securities and Exchange Commission on June 21, 2007



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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549



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FORM 20-F/A

(AMENDMENT NO. 1)



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(Mark One)



| ̈ | REGISTRATION STATEMENT PURSUANT TO SECTION 12(b) OR (g) OF THE SECURITIES EXCHANGE ACT OF 1934
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OR



|x | ANNUAL REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
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For the fiscal year ended November 30, 2006

OR



| ̈ | TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
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For the transition period from  to

OR



| ̈ | SHELL COMPANY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
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Date of event requiring this shell company report

Commission File Number 00-21742



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ACERGY S.A.

(Exact name of Registrant as specified in its charter)



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LUXEMBOURG

(Jurisdiction of incorporation or organization)

c/o Acergy M.S. Limited

Dolphin House, Windmill Road, Sunbury-on-Thames

Middlesex TW16 7HT England

(Address
of principal executive offices)

Securities registered or to be registered pursuant to Section 12(b) of the Act:



|                               |  |                                          
|------------------------------ |  | -----------------------------------------
|Title of each class            |  | Name of each exchange on which registered
|Common Shares, $2.00 par value |  | Nasdaq Global Select Market              

Securities registered or to be registered pursuant to Section 12(g) of the Act:

None

Securities
for which there is a reporting obligation pursuant to Section 15(d) of the Act:

None

Indicate the number of outstanding shares of each of the issuers classes of capital or common stock as of the close of the period covered by the
annual report:



|                               |  |            
|------------------------------ |  | -----------
|Common Shares, $2.00 par value |  | 194,501,246

Indicate by check mark if the registrant is a well-known seasoned issuer, as defined in Rule 405
of the Securities Exchange Act.    x  Yes ̈No

If this report is an annual or transition report, indicate by check mark if the registrant is not required to file
reports pursuant to Section 13 or 15(d) of the Securities Act of 1934. ̈Yes    x  No

Indicate by check mark whether the
registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and
(2) has been subject to such filing requirements for the past 90 days.    x  Yes ̈No

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated
filer, or a non- accelerated filer. See definition of accelerated filer and large accelerated filer in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer  x            Accelerated filer ̈Non-accelerated filer ̈

Indicate by check mark which financial statement item the registrant has elected to follow.

 ̈Item 17            x  Item 18

If this is an annual report, indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act) ̈Yes    x  No



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EXPLANATORY NOTE

This Form 20-F/A is being filed by Acergy S.A. (Acergy) as Amendment No. 1 to its Annual Report on Form 20-F for the fiscal year ended November 30, 2006, filed with the Securities and Exchange
Commission on April 18, 2007 (the Form 20-F), for the sole purpose of amending Exhibit 1.1, as Acergy had inadvertently filed an incorrect version of the Amended and Restated Articles of Incorporation, dated as of August 1,
2006.

This Form 20-F/A consists of a cover page, this explanatory note, Item 19 (as amended), the signature page and Exhibits 12.1
and 12.2.

Other than as expressly set forth above, this Form 20-F/A does not, and does not purport to, amend, update or restate the
information in any other item of the Form 20-F filed on April 18, 2007 or reflect any events that have occurred after the Form 20-F was filed on April 18, 2007.



|Item 19. | Exhibits.
|-------- | ---------



|     |  |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               
|---- |  | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
|1.1  |  | Amended and Restated Articles of Incorporation, dated as of August 1, 2006.                                                                                                                                                                                                                                                                                                                                                                                                                   
|     | 
|2.2  |  | Form of Supplemental Agreement to Deposit Agreement by and among the Registrant, Deutsche Bank Trust Company Americas, as successor depositary, and all holders and beneficial owners from time to
time of American Depositary Shares evidenced by American Depositary Receipts issued thereunder. Incorporated by reference to Exhibit 99.A2 to the Registrants Registration Statement on Form F-6 (File No. 333-123139) filed with the Securities
and Exchange Commission on March 4, 2005.
|     | 
|2.3  |  | Form of American Depositary Receipt (included in Exhibit 2.2).                                                                                                                                                                                                                                                                                                                                                                                                                                
|     | 
|2.4  |  | Form of Indenture for the issuance of senior debt securities (including the form of senior debt securities). Incorporated by reference to Exhibit 4.2 of the Registrants registration
statement on Form F-3/A (Registration No. 333-86288), filed with the Securities and Exchange Commission on July 31, 2002.                                                                                                                                                                              
|     | 
|2.5  |  | Form of Indenture for the issuance of subordinated debt securities (including the form of subordinated debt securities). Incorporated by reference to Exhibit 4.3 of the Registrants
registration statement on Form F-3/A (Registration No. 333-86288), filed with the Securities and Exchange Commission on August 29, 2002.                                                                                                                                                                
|     | 
|2.6  |  | Trust Deed, dated as of October 11, 2006, by and among the Registrant and The Bank of New York.*                                                                                                                                                                                                                                                                                                                                                                                              
|     | 
|4.1  |  | Amendment and Restatement Deed dated August 10, 2006 incorporated by reference to Exhibit 99.1 of the Registrants Form 6-K, filed with the Securities and Exchange Commission on August
22, 2006.                                                                                                                                                                                                                                                                                            
|     | 
|8.1  |  | Significant subsidiaries as of the end of the year covered by this Report: see Item 4. Information on the CompanySignificant Subsidiaries.                                                                                                                                                                                                                                                                                                                                                 
|     | 
|9.1  |  | Consent and report on schedules of Deloitte & Touche LLP, Independent Registered Public Accounting Firm.*                                                                                                                                                                                                                                                                                                                                                                                     
|     | 
|12.1 |  | Certification of the principal executive officer required by Rule 13a-14(a) or Rule 15d-14(a), pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                                                                                                                                                                                                                                                                                                                                     
|     | 
|12.2 |  | Certification of the principal financial officer required by Rule 13a-14(a) or Rule 15d-14(a), pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.                                                                                                                                                                                                                                                                                                                                     
|     | 
|13.1 |  | Certification of the Chief Executive Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.*                                                                                                                                                                                                                                                                                                                                      
|     | 
|13.2 |  | Certification of the Chief Financial Officer pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.*                                                                                                                                                                                                                                                                                                                                      
|     | 
|14.1 |  | Consent of Elvinger, Hoss & Prussen.*                                                                                                                                                                                                                                                                                                                                                                                                                                                         

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|* | Previously filed with Acergys Annual Report on Form 20-F on April 18, 2007 and herein incorporated by reference.
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| | This document was furnished in accordance with SEC Release Nos. 33-8212 and 34-47551.
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SIGNATURES

The registrant hereby certifies that it meets all of the requirements for filing on Form 20-F and that it has duly caused and authorized the undersigned to sign this Amendment No. 1 to its annual report on Form
20-F/A on its behalf.



ACERGY S.A.By:

/s/ Mark WoolveridgeName: Mark WoolveridgeTitle: Chairman of the BoardBy:

/s/ Stuart JacksonName: Stuart JacksonTitle: Chief Financial Officer


Date: June 21, 2007



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