 The company was formed by the January 2011 combination of its two predecessor companies, Acergy S.A. and Subsea 7, Inc.

Acergy was founded in 1970 as Stolt Nielsen Seaway, a division of the Norwegian Stolt-Nielsen Group offering divers for the exploration of the North Sea.After a series of acquisitions, including Comex Services of France in 1992 and Houston, Texas-based Ceanic Corporation in 1998, the company changed its name to Stolt Offshore in 2000.Five years later Stolt-Nielsen spun out the company as an independent business listed on the Oslo Stock Exchange and NASDAQ.