A clutch of firms including Shearman & Sterling, Sullivan & Cromwell, Slaughter and May and Wachtell Lipton Rosen & Katz have advised on IntercontinentalExchange's $11bn (£7bn) acquisition of NYSE Euronext.

The cash and stock deal, which creates a derivatives and cash markets exchange, had been delayed by almost a year because it was dependant on regulatory approval from several jurisdictions.

ICE, a commodities and financial products exchange based in Atlanta, first announced its intention to takeover NYSE Euronext last year, and received European Commission and US Securities and Exchange Commission approval earlier in the summer.

Shearman and Sullivan jointly advised ICE. A Shearman team led by London-based financial institutions and regulatory partner Barney Reynolds and counsel Azad Ali representing the group on the European aspects of the deal.

Sullivan's team was headed by New York M&A partners John Evangelakos and Audra Cohen, and included partners from the firm's financial institutions, tax, employment, competition, IP and securities practices, as well as London M&A partner Tim Emmerson.

Euronext turned to Slaughters and New York best friend network firm Wachtell. Slaughters' team was initially headed by corporate and commercial partners Frances Murphy and Padriag Cronin, though the last few months' of regulatory clearance has been handled by competition partner Claire Jeffs.

Additional advice was provided by financial regulation partner Jan Putnis, tax partner Mike Lane and pensions and employment partner Roland Doughty. Wachtell's team was headed by partners David Karp and Karessa Cain.

Other firms assisting on the deal included Loyens & Loeff and PLMJ, which acted for ICE on Dutch and Portuguese law aspects respectively, with Stibbe advising Euronext on Dutch law.

NYSE Euronext, which owns the bourses of Paris, Amsterdam, Brussels and Lisbon, is expected to float, after ICE said it is working on a public listing of its new asset.