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International Arbitration

Results matter, and ours are unmatched. For example, our International Arbitration team has secured a larger number of positive defense outcomes for sovereign states in investor-state arbitrations than any other firm in the world (see our brochure). We also have a strong track record on behalf of investors, for whom we have secured some of the largest damages awards in ICSID history. In the commercial arbitration space, our team is known for handling sensitive, complex and high-stakes disputes under all major arbitral rules, and is widely acclaimed for its oral argument and cross-examination skills in the hearing room. Twice named by Law360 as 'Practice Group of the Year,’ we offer clients a team of exceptional depth and scope with highly ranked practitioners based in eight offices across the U.S., UK, China, and South Korea. 

  • Success Rate: No other firm has an unparalleled track record of positive rulings on behalf of states in investment arbitration. We also have a strong track record on behalf of investors, and in commercial arbitrations.

  • Diversity, Experience and Expertise: Our team members are highly ranked arbitration practitioners and thought leaders, hailing from a broad range of legal, cultural, and linguistic backgrounds. We assist clients from every part of the world.

  • Client Service: With 40+ attorneys across 8 offices in the US, UK, China, and South Korea, and professional fluency in 10 languages, we provide extraordinarily responsive and user-friendly client service and support.

“What distinguishes Arnold & Porter from other firms is their expertise in every aspect of international arbitration. They have both deep knowledge and wide experience to provide the optimal defense.” – (client) Chambers USA 2025
“Arnold & Porter is a giant of investor-state arbitration in Latin America.” – Legal 500 Latin America 2025
“Arnold & Porter is a sophisticated, well-oiled machine comprised of a deep talent pool meticulously trained by an extremely knowledgeable and experienced leadership.” – (client) Chambers Global 2025
Based on verifiable data from the ICSID website (the world’s leading investment arbitration institution), Arnold & Porter is the world’s leading law firm in ICSID history in number of cases resulting in full dismissal of all claims against the Respondent State.

News & Perspectives

Media Mention

Law Times Korea Features Arnold & Porter Partner Anton Ware on Career Growth Through International Arbitration
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News

Arnold Porter Recognized in Chambers Asia-Pacific 2026
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News

Arnold & Porter Secures Settlement in ICSID Arbitration for Republic of El Salvador
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News

Arnold & Porter Wins Major Victory for the Republic of Korea in US$4.7 billion Lone Star Dispute
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News

The Legal 500 Greater China 2026 Again Recognizes Arnold & Porter’s International Arbitration Capabilities
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Presentation

AUWCL Center on International Commercial Arbitration
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News

‘Best Law Firms’ 2026 Names Arnold & Porter ‘Law Firm of the Year’ for Litigation - Antitrust; Ranks 34 National Practices and 83 Metro Practices
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Further Reading

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Language - English

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Key Contacts

Maria Chedid
Maria Chedid
Partner
San Francisco
+1 415.471.3279
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Recognition

  • Chambers Global
    International Arbitration (Global Market Leaders) (2019-2025)
    International Arbitration — Latin America (International Counsel) (2021-2025)
    International Arbitration: The Elite (USA) (2013-2025)
    International Arbitration Foreign Expertise "Spotlight Table" (USA) (2021-2025)
    International Arbitration: Investor-State Arbitration (UK) (2023-2025)
  • Chambers Latin America
    International Arbitration (2013-2026)
  • Chambers UK
    International Arbitration: Investor-State Arbitration (UK-wide) (2022-2026)
  • Chambers USA
    International Arbitration: The Elite (Nationwide) (2007-2025)
  • Best Law Firms Ranked by Best Lawyers
    International Arbitration: Commercial (National) (2010-2026)
    International Arbitration: Commercial (New York) (2023-2026)
    International Arbitration: Commercial (San Francisco) (2024-2025)
    International Arbitration: Commercial (Washington, D.C.) (2010-2026)
    International Arbitration: Governmental (National) (2011-2026)
    International Arbitration: Governmental (New York) (2024-2026)
    International Arbitration: Governmental (Washington, D.C.) (2011-2026)
  • Global Arbitration Review
    "GAR 100" (2009-2025)
    Listed in Global Arbitration Review's "GAR 30" eight times
  • Latin Lawyer 250
    Arbitration (2014-2026)
  • Latinvex's Top International Law Firms
    Arbitration (2023-2025)
  • The Legal 500 Greater China
    “Firms to Watch” Dispute Resolution: Arbitration: Foreign Firms (2025-2026)
  • The Legal 500 Latin America
    International Arbitration (2012-2026)
  • The Legal 500 UK
    International Arbitration (2013-2026)
  • The Legal 500 US
    International Arbitration (2008-2025)
    International Litigation (2018-2025)