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Three Crowns LLP

International Arbitration: Investor-State Arbitration

Global Guide 2026 : UK

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Three Crowns LLP

Rankings

Chambers Review

Provided by Chambers

International Arbitration: Investor-State Arbitration - UK

Band 1

What the Team is Known For
Three Crowns houses an acclaimed international arbitration outfit with an impressive client roster, featuring well-known names from the energy, natural resources, financial services, telecoms and engineering sectors. The firm fields a heavyweight team of arbitration specialists with expertise in both commercial arbitrations and investor-state disputes, acting for clients across Latin America, the Middle East and Africa. The team has extensive experience acting for clients in arbitrations under the rules of the major arbitration institutions, such as ICSID, the LCIA and the ICC. It is well versed in handling BIT claims and disputes brought under the Energy Charter Treaty.
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Work Highlights

Provided by Chambers

  • Three Crowns represented ConocoPhillips in an USD8 billion ICISID arbitration against Venezuela concerning the expropriation of the client's upstream assets in the Orinoco oil belt.

Strengths

Provided by Chambers

  • Three Crowns distinguishes itself through its singular focus on international arbitration, combining strategic clarity, rigorous legal analysis and advocacy.

    International Arbitration: Investor-State Arbitration respondentGlobal

  • They were customer-friendly, incredibly responsive and willing to listen to the client's various concerns to adapt their advice and legal strategy accordingly.

    International Arbitration: Investor-State Arbitration respondentGlobal

  • Three Crowns is an extremely flexible and business-focused counsel, juggling tremendous amounts of work and proactively considering the company's specific issues and priorities.

    International Arbitration: Investor-State Arbitration respondentGlobal

Notable Practitioners

Provided by Chambers

  • Constantine Partasides
    Constantine Partasides

    Constantine Partasides

    Constantine Partasides KC is a highly esteemed arbitration specialist acting for top-echelon clients in complex commercial and investment treaty disputes. He is also recognised for his capabilities as arbitrator.

    • Constantine has impeccable advocacy skills; he can react quickly to tribunals and questions.

      International Arbitration: Investor-State Arbitration respondentGlobal

    • Constantine provides excellent, thoughtful, strategic advice.

      International Arbitration: Investor-State Arbitration respondentGlobal

    • Constantine is incredibly eminent and brilliant.

      International Arbitration: Investor-State Arbitration respondentGlobal

    • Constantine is without a doubt one of the best advocates of our age; a great orator who knows exactly how to deliver a case. He's got a very lovely and engaging style.

      International Arbitration: Investor-State Arbitration respondentGlobal

    • He is very attuned to the needs of the client.

      International Arbitration: Investor-State Arbitration respondentGlobal
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  • Gaëtan Verhoosel
    Gaëtan Verhoosel

    Gaëtan Verhoosel

    Gaëtan Verhoosel KC has earned an excellent reputation for his extensive commercial and investor-state practice, handling arbitrations seated across the world and under the auspices of various institutions. He also accepts appointments as arbitrator.

    • Gaëtan is a top-ranking legal professional in all aspects.

      International Arbitration: Investor-State Arbitration respondentGlobal

    • Gaetan is incredibly knowledgeable and practical in his approach. He listens well to the changing temperaments of management and provides solutions as required.

      International Arbitration: Investor-State Arbitration respondentGlobal
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  • Reza Mohtashami
    Reza Mohtashami

    Reza Mohtashami

    Reza Mohtashami KC devotes much of his arbitration practice to the energy and telecoms sectors, acting for various entities in high-value disputes such as those held under ICC rules. He has a particular focus on the Middle East.

    • He can advise with a helicopter view and understand the best way to manage the subject.

      International Arbitration: Investor-State Arbitration respondentGlobal

    • He gets straight to the point and is very polished.

      International Arbitration: Investor-State Arbitration respondentGlobal
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  • Leilah Bruton
    Leilah Bruton

    Leilah Bruton

    Leilah Bruton has particular expertise in energy, mining and telecoms disputes. She is experienced acting for clients in a range of jurisdictions and under a variety of different arbitral rules.

    • She is highly responsive, business-oriented and a pleasure to work with.

      International Arbitration: Investor-State Arbitration respondentGlobal

    • She has great attention to detail and has the macro-strategic vision in mind.

      International Arbitration: Investor-State Arbitration respondentGlobal

    • Leilah is not only a pleasure to work with, but an extremely knowledgeable and business-focused partner who is always aware of the material little details that can make a difference.

      International Arbitration: Investor-State Arbitration respondentGlobal
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  • Manish Aggarwal
    Manish Aggarwal

    Manish Aggarwal

    Manish Aggarwal has strong experience advising across both investor-state and commercial arbitrations.. His client roster includes sovereign states and corporates, and he is particularly capable in matters pertaining to energy.

    • Manish is very smart, thoughtful and gave strategic advice.

      International Arbitration: Investor-State Arbitration respondentGlobal

    • His strong legal acumen, commercial understanding and ability to anticipate procedural developments have been invaluable throughout.

      International Arbitration: Investor-State Arbitration respondentGlobal

    • Manish is really capable and a real gentleman. He is extremely hard-working and dedicated, and has good judgement and good people skills.

      International Arbitration: Investor-State Arbitration respondentGlobal

    • His attention to detail is impressive.

      International Arbitration: Investor-State Arbitration respondentGlobal
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Ranked Individuals at Three Crowns LLP (5)

UK

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