Shearman & Sterling and Sullivan & Cromwell are among a clutch of firms to win advisory roles as European telecoms group Altice agrees to buy US operator Cablevision in a deal worth $17.7bn (£11.4bn).

Shearman is advising longstanding client Altice with a cross border team that includes London M&A partner George Karafotias and Paris capital markets partner Sami Toutounji.