Acting for individuals, sovereign states, and international organisations, Steptoe International (UK) LLP advises on treaty negotiations, investor-state disputes, and ECT claims. Attracting client praise for its ‘excellent command of international investment law’, the group also handles sovereign immunity matters, expertly overseen by practice head Matthew Coleman. Christophe Bondy has extensive experience advising on investment treaty arbitration, while Thomas Innes is another key contact on the investor-state arbitration front; Innes also has experience in ITLOS proceedings.
Legal 500 Editorial commentary
Accolades
Client satisfaction: Lawyer & team quality
Client satisfaction: Billing & efficiency
Client satisfaction: NPS ®
Testimonials
Collated independently by Legal 500 research team.
‘Excellent command of international investment law.’
‘The partners are accessible and look for a realistic resolution of disputes.’
Key clients
- The European Union
- Pennyroyal Limited
Work highlights
Serving as external counsel to the European Union in the Nord Stream 2 investment treaty claim under the Energy Charter Treaty arising out of the application of European competition rules to the ownership and operation of this multi-billion-dollar pipeline.
Lawyers
Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.
Next Generation Partners
Junior partners with significant recognition from clients and peers in the market and key roles on multiple matters.
Practice head
Matthew Coleman
Other key lawyers
Christophe Bondy; Thomas Innes

