England - London • Dispute resolution
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International arbitration

Three Crowns LLP

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'The leading international arbitration boutique by far, Three Crowns LLP only accepts instructions for international disputes. The firm's current commercial and investor-state caseload covers some of the highest-profile disputes in the world; and its industry expertise incorporates aerospace, energy, construction, telecoms, financial services, and Pharma. Experienced in obtaining multi-billion-dollar awards, Constantine Partasides KC has a growing arbitration-related litigation practice; and Gaëtan Verhoosel KC acts in commercial and treaty arbitrations across the power, banking, infrastructure, renewables, and oil and gas sectors. Also integral to the group, Reza Mohtashami KC is a Middle East disputes expert; Carmen Martinez Lopez is triple-qualified in England, New York and Spain; and Manish Aggarwal and Leilah Bruton act in investor-state and commercial cases. At counsel level, Hamid Abdulkareem is 'an excellent lawyer' and Jonathan Fernandes acts under all major arbitration rules. Maanas Jain, Richard Trinick, Farouk El-Hosseny and Vee Vian Thien are experienced senior associates.

Legal 500 Editorial commentary

Testimonials

Collated independently by Legal 500 research team.

  • ‘The 3C practice is dynamic, knowledgeable and well organised.’

  • ‘All the 3C lawyers are competent and sharp, and work very effectively.'

  • 'Constantine Partasides KC is a very effective oral advocate and cross-examiner.’

  • ‘The top advocate in London is founder Constantine Partasides - the best of the best.'

  • ‘Carmen Martinez Lopez is the most engaged partner around. She is on top of everything and does most of the drafting. Her team is also  exceptional at all levels.'

  • ‘3C is the leading international arbitration boutique by far. International arbitration is all they do, and they do it extremely well.’

  • 'Maanas Jain is a star of the future.’

  • ‘Hamid Abdulkareem is an excellent lawyer. Great attention to detail and an impressive understanding of the law.'

Key clients

  • American Express
  • Boeing
  • BP
  • Chevron
  • ConocoPhillips
  • ContourGlobal
  • Crescent Petroleum
  • Elliot Associates
  • Eni
  • ExxonMobil
  • Kingdom of Bahrain
  • Olayan Financing Company
  • PETRONAS
  • Petroquímica Comodoro Rivadavia
  • Republic of Chile
  • Sacyr
  • Sultanate of Oman
  • TotalEnergies
  • Trafigura

Work highlights

  • Representing Chile in an ICSID claim filed by Interconexión Eléctrica (ISA) under the Chile-Colombia free-trade agreement, the claim stemming from delays incurred by ISA in the construction of the Cardones-Polpaico Electricity Transmission Line.
  • Acting for ExxonMobil in its re-submitted arbitration proceedings against Venezuela.
  • Acting for Crescent Petroleum in its defence of a multibillion-dollar award in the English courts.

Lawyers

Hall of Fame
The lawyers at the very top of the profession, widely known and respected by peers and clients for their longstanding involvement in market-leading work.
Constantine Partasides KC
Hall of fameThree Crowns LLP
Constantine, one of the founding partners of Three Crowns, has appeared as lead counsel in some of the largest international arbitrations of the last two decades. He has secured a series of multi-billion dollar awards for his clients, and defended others in ‘bet-the-company’ claims arising in a number of different business sectors. He is also listed in the “Hall of Fame” for international arbitration in The Legal 500.
Leading associates
Rising stars with regular involvement in their team's key work, and recognition from peers or clients as being ones to watch.
Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.
Reza Mohtashami KC
Three Crowns LLP
Reza is a partner in the London office. He has represented clients as counsel and advocate in more than 90 arbitrations conducted under a variety of arbitration rules in many different jurisdictions. Reza has particular expertise in disputes arising in emerging markets with a focus on the telecoms, energy, and infrastructure sectors. Reza regularly acts as arbitrator and has been appointed as party-nominated arbitrator, Chair or Sole Arbitrator in more than 20 arbitrations conducted under the ICC, LCIA, ICDR-AAA, SIAC, DIAC, DIFC-LCIA Rules. Reza is a qualified English solicitor-advocate and was appointed King's Counsel in recognition of his advocacy skills in 2018.
Next Generation Partners
Junior partners with significant recognition from clients and peers in the market and key roles on multiple matters.
Leilah Bruton
Three Crowns LLP
Leilah is a partner in our London office. She has extensive experience representing corporations on the resolution of complex disputes involving investment treaties and contractual relationships, with a particular focus on disputes in the oil & gas, mining, and telecoms sectors. Leilah has also been recognised as a Next Generation Partner for both international arbitration and public international law in The Legal 500 UK 2023, and a Rising Star in The Legal 500’s International Arbitration Powerlist 2019 for the UK.
Manish Aggarwal
Three Crowns LLP
Manish is a dual-qualified English solicitor and Indian advocate, and partner in the London office. He has extensive experience of representing clients in both commercial and investment treaty arbitrations across a broad range of sectors (including energy, infrastructure, life sciences, telecommunications, and technology) and in arbitration-related court litigation. He has also been recognised in the India Business Law Journal’s list of top international lawyers for India-related matters, in which peers describe him as a “highly skilled advocate with a staggering depth of investment law insight”.

Practice head

The lawyer(s) leading their teams.

Constantine Partasides KC, GaëtanVerhoosel KC

Other key lawyers

Reza Mohtashami KC, Carmen Martinez Lopez, Manish Aggarwal Leilah Bruton, Hamid Abdulkareem, Jonathan Fernandes, Maanas Jain, Richard Trinick, Farouk El-Hosseny, Vee Vian Thien, Ridhi Kabra

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