Allen & Overy (A&O) and Wachtell Lipton Rosen & Katz are taking the lead roles on NASDAQ's acquisition of US options exchange operator International Securities Exchange from Deutsche Boerse.

NASDAQ has agreed to pay $1.1bn (£770m) to Deutsche Boerse for International Securities Exchange Holdings, which operates three equity options exchanges in the US.

A&O is acting for Deutsche Boerse, with a team co-led by Frankfurt corporate partner Hartmut Krause and New York corporate partner Peter Harwich.

Other key partners include New York-based US antitrust co-head Elaine Johnston, and tax partners Heike Weber in Frankfurt and Jack Heinberg and Dave Lewis in New York.

Nasdaq is being advised by Wachtell. Its team is being spearheaded by New York corporate partner David Lam.

Jones Day is providing regulatory counsel to NASDAQ.

A&O's Krause said: "Our US strategy is very focused on cross-border M&A and this type of deal hits our absolute sweet spot. We have a full capability in the US to run large and complex M&A transactions, in particular with non-US parties in the US market doing cross-border M&A. This is what we are geared for in the US market."

The deal takes place alongside of Deutsche Boerse's ongoing merger talks with London Stock Exchange (LSE).

In those talks Freshfields Bruckhaus Deringer is acting for LSE and Linklaters is representing Deutsche Boerse.

Freshfields team includes corporate partner Andrew Hutchings, M&A partner Mark Rawlinson and London M&A co-head Piers Prichard Jones.

Linklaters is fielding a team including London corporate partners Roger Barron and Simon Branigan and Germany corporate partners Ralph Wollburg and Staffan Illert.