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Acergy

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Adapted from the English Wikipedia article Acergy, available under CC BY-SA 4.0Updated 30 November 2025
Acergy S.A.
Company typePublic
IndustryOffshore engineering and construction
PredecessorStolt Offshore, Stolt Comex Seaway
Founded1970
FounderStolt-Nielsen Group
Defunct2011
FateMerged with Subsea 7 Inc. to form Subsea 7 S.A.
SuccessorSubsea 7 S.A.
Headquarters
London
,
United Kingdom
Area served
Global
Key people
Kristian Siem (chairman), Jean Cahuzac (CEO)
ProductsSubsea Umbilical Risers and Flowlines (SURF), Inspection, Maintenance and Repair (IMR), Conventional Field Development
OwnerPublicly traded on Oslo Stock Exchange and NASDAQ (until merger)

Acergy S.A. was a global offshore engineering and construction firm specializing in seabed-to-surface services. Previously operating under the names Stolt Offshore and Stolt Comex Seaway, it belonged to the Stolt-Nielsen Group until 2005. Although registered in Luxembourg, its main office was situated in London, with additional locations in strategic international hubs such as Stavanger, Norway; Aberdeen, UK; Suresnes, France; Houston, US; Rio de Janeiro, Brazil; Perth, Australia; St. John's, Canada; and Singapore. The company was publicly traded on both the Oslo Stock Exchange and NASDAQ. In 2011, Acergy combined operations with Subsea 7, Inc., a firm based in the Cayman Islands, resulting in the creation of Subsea 7 S.A.

History

Established in 1970 under the name Stolt Nielsen Seaway in Haugesund, the enterprise initially focused on diving services supporting North Sea exploration activities as a division of the Stolt-Nielsen Group. Growth milestones included relocating to Aberdeen in 1989 and acquiring French diving specialist Comex Services in 1992. The company's first ultra-deepwater contract, awarded off West Africa in 1997, was followed by strategic purchases of Houston’s Ceanic Corporation, Denmark’s NKT Flexibles, and France’s ETPM.

In 2000, the firm rebranded as Stolt Offshore. A significant change occurred in 2005 when Stolt-Nielsen Group sold its shares, leading to public listings on both the Oslo Stock Exchange and NASDAQ. The corporate identity was updated to Acergy on 1 March 2006.

On 21 June 2010, Acergy declared its merger plans with Subsea 7 Inc., finalized on 7 January 2011. Post-merger, the entity operated under the Subsea 7 name while retaining Acergy’s Luxembourg registration and London headquarters. Governance was structured with Kristian Siem as chairman and Jean Cahuzac as chief executive officer, ensuring leadership continuity from both predecessor companies.

Operations

Acergy conducted business across four principal sectors: Subsea Umbilical Risers and Flowlines (SURF); Inspection, Maintenance and Repair (IMR); and Conventional Field Development.

Joint ventures

Prominent partnerships included Seaway Heavy Lifting based in the Netherlands, Denmark’s NKT Flexibles, Malaysia’s SapuraAcergy, and Nigeria’s Global Oceon Engineers.

Assets

Vessels: The fleet comprised Acergy Condor, Acergy Discovery, Acergy Eagle, Acergy Falcon, Acergy Harrier, Acergy Hawk, Acergy Legend, Acergy Osprey, Acergy Petrel, Acergy Viking; time-chartered vessels Far Saga and Skandi Acergy; Pertinacia; Polar Queen; Polarbjørn (time charter); Sapura 3000 (SapuraAcergy JV); Stanislav Yudin (Seaway Heavy Lifting JV); Oleg Strashnov (newbuild for Seaway Heavy Lifting JV); new constructions including Acergy Havila, Acergy Borealis, and Seven Waves (scheduled for delivery in 2013).

Barges: Included vessels such as Acergy Polaris, Antares, and Acergy Orion.

References