Slaughter and May and Morrison & Foerster have won the lead roles as Japan's SoftBank agrees to acquire UK smartphone chip designer ARM for £24bn.

Slaughters is advising Cambridge-based ARM with a team in London including senior partner Steve Cooke, corporate partner Chris McGaffin and competition partner Jordan Ellison.

Davis Polk & Wardwell is also advising ARM alongside Slaughters.

Morrison & Foerster is taking the lead advising Tokyo-based SoftBank, one of the world's largest technology companies.

MoFo's team is being jointly led by Ken Siegel, managing partner of the firm's Tokyo office, and Graeme Sloan, head of corporate in London and global chair of its M&A practice.

In London, the firm's team includes corporate partners Vlad Maly, Andrew Boyd and Gary Brown; tax partner Trevor James; regulatory partner Kevin Roberts; and finance partner Phil Slater. In Tokyo, the team comprises corporate partners Ivan Smallwood, Noah Carr, Leo Aguilar and James Robinson, and finance partner Dale Caldwell.

In Europe, Brussels antitrust partners  Rony Gerrits and Tom McQuail are advising alongside Berlin regulatory partner Andreas Gruenwald.

The firm is also advising out of its Washington office with a team including antitrust partners Jeff Jaeckel in Washington and regulatory partner Jessie Liu.

Freshfields Bruckhaus Deringer is advising the technology company out of London with a team led by corporate partners Ben Spiers and Stephen Hewes.

Cleary Gottlieb is advising New York merchant bank The Raine Group, one of the financial advisers to SoftBank. Its team is being led by London M&A partner Simon Jay.

White & Case is advising Japanese investment banking and securities firm Mizuho Securities, another financial adviser to SoftBank. Its team is being led by London M&A partner Philip Broke and Tokyo M&A co-head Jun Usami.