Davis Polk & Wardwell and Skadden Arps Slate Meagher & Flom have won lead roles on the biggest energy deal since 2006 – Exxon Mobil’s acquisition of natural gas company XTO Energy for $31bn (£19bn).

Davis Polk, which represented Exxon on its $80bn (£49bn) purchase of Mobil in 1999, reprised its role as lead M&A counsel, with a team led by M&A head George Bason, alongside corporate partners Louis Goldberg and Arthur Golden, tax partner Avishai Shachar, benefits partner Edmond FitzGerald and environmental partner Gail Flesher.