Freshfields Bruckhaus Deringer, Gibson Dunn & Crutcher and White & Case have won roles advising on Sophos's £1bn flotation, the largest ever initial public offering in the UK tech sector.

The Oxford-based company listed last Friday (June 26) and raised total gross proceeds of £352m, according to the London Stock Exchange.

Sophos has a free float of 40%, with a further 36.3% owned by Apax, the private equity group, and 17.7% by its founders Jan Hruska and Peter Lammer. The remainder is held by management and other investors.

Freshfields advised Apax Partners with a team including London corporate partners Mark Austin, Julian Makin and Ash Qureshi.

In January last year, Freshfields advised the Guardian Media Group in its £600m sale of a its remaining 50.1% stake in Trader Media Group (TMG) to Apax Partners. City corporate partner Simon Marchant led the firm's team on that deal.

White & Case advised the banks on the deal including JP Morgan and Morgan Stanley, while Gibson Dunn advised Sophos' founders.

White & Case's team was co-led by London securities partners Inigo Esteve and Joshua Kiernan and included New York technology partner Adam Chernichaw and London head of tax Peita Menon.

Esteve said: "The success of this landmark initial public offering highlights the London Stock Exchange as a listing venue for tech companies."

Other recent tech deals announced this year include US company Avago Technologies' May 2015 acquisition of Broadcom Corporation for $37bn (£24bn), the largest tech deal of 2015 so far. Latham advised Avago and Skadden represented Broadcom on the deal.