6-K

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                       SECURITIES AND EXCHANGE COMMISSION

                             Washington, D.C. 20549

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                                    FORM 6-K

                        REPORT OF FOREIGN PRIVATE ISSUER

                    Pursuant to Rule 13a-16 or 15d-16 of the
                         Securities Exchange Act of 1934

                          For the month of April, 2008

                        Commission File Number: 000-21742

                                   Acergy S.A.
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                 (Translation of registrant's name into English)

                             c/o Acergy M.S. Limited
                                  Dolphin House
                                  Windmill Road
                                Sunbury-on-Thames
                          Middlesex, TW16 7HT, England
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                    (Address of principal executive offices)

     Indicate by check mark whether the registrant files or will file annual
reports under cover Form 20-F or Form 40-F.

                    Form 20-F [X]              Form 40-F [ ]

     Indicate by check mark if the registrant is submitting the Form 6-K in
paper as permitted by Regulation S-T Rule 101(b)(1): [ ]

     Indicate by check mark if the registrant is submitting the Form 6-K in
paper as permitted by Regulation S-T Rule 101(b)(7): [ ]

     Indicate by check mark whether by furnishing the information contained in
this Form, the registrant is also thereby furnishing the information to the
Commission pursuant to Rule 12g3-2(b) under the Securities Exchange Act of 1934.

                    Yes [ ]                    No [X]

     If "Yes" is marked, indicate below the file number assigned to the
registrant in connection with Rule 12g3-2(b): 82-________

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Attached herewith as Exhibit 99.1 is a press release, dated April 8, 2008,
whereby Acergy S.A. (the "Company") announced it has purchased an additional
475,600 of its common shares at an average price of NOK 112.81 per share.

The attached press release shall be deemed to be incorporated by reference into
the prospectuses forming a part of the Company's Registration Statements on Form
S-8 (No. 033-85168, No. 333-09292, No. 333-74321, No. 333-124983 and No.
333-124997) and the Company's Registration Statements on Form F-3 and Form F-3/A
(No. 333-86288) and to be a part of such prospectuses from the date of the
filing thereof.

Certain statements set forth above and contained in the press release furnished
pursuant to this Form 6-K may include "forward-looking statements" within the
meaning of Section 27A of the Securities Act of 1933 and Section 21E of the
Securities Exchange Act of 1934. These statements may be identified by the use
of words like "anticipate," "believe," "estimate," "expect," "intend," "may,"
"plan," "project," "will," "should," "seek," and similar expressions. The
forward-looking statements reflect the Company's current views and assumptions
and are subject to risks and uncertainties. The following factors, and others
which are discussed in the Company's public filings and submissions with the
U.S. Securities and Exchange Commission, are among those that may cause actual
and future results and trends to differ materially from the Company's
forward-looking statements: the Company's ability to recover costs on
significant projects; the general economic conditions and competition in the
markets and businesses in which the Company operates; the Company's relationship
with significant clients; the outcome of legal and administrative proceedings or
governmental enquiries; uncertainties inherent in operating internationally; the
timely delivery of ships on order and the timely completion of ship conversion
programs; the impact of laws and regulations; and operating hazards, including
spills and environmental damage. Many of these factors are beyond the Company's
ability to control or predict. Given these factors, you should not place undue
reliance on the forward-looking statements.

                                    SIGNATURE

          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, thereunto duly authorized.

                                                  ACERGY S.A.


Date:  April 10, 2008                             By: /s/ Stuart Jackson
                                                      --------------------------
                                                  Name:  Stuart Jackson
                                                  Title: Chief Financial Officer

EX-99.1

                                                        [GRAPHIC OMITTED] Acergy

NEWS RELEASE

                    Acergy S.A. Share Buyback - April 8, 2008

London, England - April 8, 2008 - Acergy S.A. (NASDAQ NM: ACGY; Oslo Stock
Exchange: ACY) advises that it has today purchased an additional 475,600 of its
common shares at an average price of NOK 112.81 per share. The shares were
purchased in accordance with its share repurchase programme previously announced
on September 11, 2006.

The shares have been acquired on the Oslo Stock Exchange and were purchased in
the market according to the authority granted by the Board.

As of today's date Acergy has reissued 3,054,243 treasury shares. As a result of
this transaction and delivering treasury shares to satisfy options exercises,
Acergy S.A. holds directly 12,105,082 of its own shares, representing 6.21% of
the total outstanding shares, as well as indirectly holding 879,121 shares
representing 0.45% of the total outstanding shares.

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Acergy S.A. is a seabed-to-surface engineering and construction contractor for
the offshore oil and gas industry worldwide. We plan, design and deliver
complex, integrated projects in harsh and challenging environments. We operate
internationally as one group - globally aware and locally sensitive, sharing our
expertise and experience to create innovative solutions. We are more than
solution providers, we are solution partners - ready to make long-term
investments in our people, assets, know-how and relationships in support of our
clients.

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Contacts:
Karen Menzel
Tel: + 44 (0) 20 8210 5568
karen.menzel@acergy-group.com
www.acergy-group.com

     If you no longer wish to receive our press releases please contact:
kelly.good@acergy-group.com