The Legal 500

Twitter Logo Youtube Circle Icon LinkedIn Icon

Stewarts Law LLP

Work 020 7822 8000
Fax 020 7822 8037
Leeds, London

Keith Thomas

Work 020 7822 8177
Stewarts Law LLP

Work Department

Securities Litigation 


Head of the Securities Litigation department. 

Keith focuses on complex and high-value commercial litigation with a particular emphasis on financial and banking disputes. Keith has recently led the high profile RBS Rights Issue Litigation to a successful conclusion on behalf of 313 major financial institutions.

Keith’s expertise is in banking and financial litigation, securities litigation, multi-jurisdictional and international disputes, fraud and asset recovery, private client and trust disputes.

Cases on which Keith has acted include the RBS Rights Issue Litigation where he advised 313 financial institutions on recovering their losses arising from RBS’s £12bn rights issue, the recovery from London institutions of monies for a US receiver of a collapsed hedge fund and a number of high profile Russian disputes being tried in London.


Trained McKenna & Co (CMS Cameron McKenna); qualified 1996. Systems integration manager British Telecom 1989-91; McKenna & Co 1996-99; associate Llewelyn Zietman (later Arnander Irvine & Zietman) 2000-03; associate Shook, Hardy & Bacon 2003-04; associate Manches LLP 2004-05; partner 2006-10; partner Stewarts Law LLP 2010 to date. Co-author of the UK chapter of International Corporate Law (Aspatore Books).


Keith is a member of the International Bar Association and the London Solicitors Litigation Association.


Merchant Taylors School, Northwood; University of York (1988 MEng Electronic Systems Engineering); College of Law, York (1992 CPE; 1993 LSF).


Skiing and sailing when his children allow him the time.

London: Dispute resolution

Banking litigation: investment and retail

Within: Banking litigation: investment and retail

Stewarts Law LLP¬†is 'an outstanding conflict-free firm that is able to take on banks and other financial institutions, which it regularly does¬†‚Äď and wins'. The largest litigation-only law firm in the UK is traditionally known for claimant matters, but it is increasingly being instructed for defence work. The practice also benefits from the firm's¬†civil fraud practice, which is often involved in disputes over complex financial instruments and structures. It acted for the liquidators of Kaupthing Bank in relation to a ‚ā¨500m claim against Deutsche Bank, which arose from the sale of complex banking derivatives.¬†Clive Zietman¬†is a go-to lawyer in London for large-scale litigation against banks. Also highly rated are¬†Sean Upson,¬†Keith Thomas,¬†David Hughes,¬†¬†¬†Marc Jones, Fiona Gillett, Paul Brehony¬†and¬†Ian Gatt QC, along with Lucy Ward¬†and Laura Jenkins. Elaina Bailes¬†and Lorraine Lanceley¬†were promoted to the partnership, and senior associate¬†Joe Mitchell¬†and associate¬†Harry Spendlove¬†are also experienced advisers.

[back to top]

Commercial litigation

Within: Commercial litigation

Stewarts Law LLP's 'lawyers are highly co-ordinated, smart, commercial, proactive and responsive'. The largest litigation-only law firm in the UK, it is almost uniquely conflict-free and one of the few London firms able to accept instructions against major banks and financial institutions. Clive Zietman heads the commercial litigation department, Sean Upson has a highly rated banking litigation practice, Keith Thomas has over 20 years’ experience dealing with the full range of banking disputes, and David Hughes advises governments, sovereign funds and institutional clients on complex fraud and regulatory issues; the other names to note are Marc Jones, Fiona Gillett, Paul Brehony and Lucy Ward. Elaina Bailes and Lorraine Lanceley were made up to the partnership in 2019.

[back to top]

Back to index

Legal Developments in London

Legal Developments and updates from the leading lawyers in each jurisdiction. To contribute, send an email request to