A raft of the top law firm leaders have signed a pledge to tackle corruption within the professional services sector ahead of an anti-corruption summit hosted by Prime Minister David Cameron tomorrow.

The leaders of magic circle firms Clifford Chance, Allen & Overy and Linklaters are among the signatories to a document promising to up efforts to tackle corruption in the sector.

Other signatories from the legal sector include Ben Tidswell, chairman of Ashurst; Juan Picon, senior partner at DLA Piper; and Paul Rawlinson, London managing partner of Baker & McKenzie.

The statement of support for the London anti-corruption summit says that the organisations will "work together to share experience, promote the codification of good practice, and in dialogue with government, regulators and professional bodies to support their work addressing the practical limitations of the wider system we currently work within".

It adds: "We deplore the damage caused to social progress and economic development by corruption."

The statement was also signed by executives from the big four accountants and real estate companies including CBRE and Savills.

The pledge to tackle corruption follows this week's revelations that multiple international firms including Clifford Chance, A&O and Clyde & Co have been named in the latest Panama Papers leak.

No firm has been accused of any wrongdoing.

The International Consortium of Investigative Journalists (ICIJ) published a searchable database of information on May 9 on almost 320,000 offshore entities, drawn from the 11.5 million documents leaked last month from the Panama law firm Mossack Fonseca, as well as a previous data leak from 2013.

Most of the firms included in the data added yesterday are simply listed as advisers, trustees or intermediaries between Mossack Fonseca and its clientele.

Full list of signatories

Law firms

Wim Dejohnghe, senior partner, A&O LLP
Ben Tidswell, chairman, Ashurst LLP
Paul Rawlinson, managing partner, Baker & McKenzie LLP
Chris Perrin, executive partner and general counsel, Clifford Chance LLP
Penelope Warne, senior partner, CMS Cameron McKenna LLP
Jeremy Cohen, chief executive, Dentons LLP
Juan Picon, senior partner DLA Piper International LLP
Mark Rigotti and Sonya Leydecker, joint chief executives, Herbert Smith Freehills LLP
Nicholas Cheffings, chair, Hogan Lovells
Robert Elliot, senior partner, Linklaters LLP
Peter Martyr, global chief executive, Norton Rose Fulbright
Oliver Brettle, executive partner, White & Case

Financial services firms

David Cruickshank, global chaiman, Deloitte
Mark Weinberger, global chairman and chief executive office, EY
John Veihmeyer, chairman, KPMG
Dennis Nally, chairman, PWC
Simon Michaels, managing partner, BDO LLP
Ed Nusbaum, chief executive officer, Grant Thornton International
Phil Verity, UK senior partner and co-chief executive officer, Mazars Group

Real estate firms

Tyson Avery, chief ethics and compliance officer, CBRE Group Inc
Martin Samworth, chief executive officer EMEA, CBRE Ltd
Chris Ireland, UK chairman, JLL Uk and Europe
Jeremy Helsby, group chief executive officer, Savills
Alistair Frank, senior partner and group chairman, Knight Frank LLP
Catherine Spitzer, chief operating officer, Bidwells
Tony Horrell, chief executive officer UK and Ireland, Colliers
Alison Platt, chief executive officer, Countrywide
John Forester, chief executive officer EMEA, Cushman and Wakefield
Simon Prichard, senior partner, Gerald Eve LLP
Andy Martin, senior partner, Strutt and Parker