Marcio Vasconcellos

• Representing a U.S. investment trading vehicle in a SCA international arbitration under Brazilian law. The dispute concerns violations of a shareholders’ agreement.
• Representing a Central Asian investor in an ICSID arbitration against Canada. The dispute concerns investments in the Canadian oil and gas industry.
• Representation of a Brazilian subsidiary of one of the largest pulp and paper manufacturing companies in the world in a multi-billion-dollar ICC arbitration under Brazilian law. The dispute concerned the acquisition of a forestry and paper product manufacturer in Brazil.
• Representation of a major Japanese general trading and investment company in an LCIA arbitration under New York law. The dispute concerned the breach of a shareholders’ agreement in connection with our client’s divestment of a project in Indonesia.
• Representing a premier mobile gaming and sports-tech entertainment company in a JAMS arbitration under New York law. The dispute concerns violations of a shareholders’ agreement.
• Representing an international hospitality company in a CBMA international arbitration under Brazilian law. The dispute concerns hotel properties in Brazil.
• Representing an international company in animal nutrition and fish feed production in an ICC arbitration under Ecuadorian law. The dispute concerns violations of a shareholders’ agreement.
• Representing a global supplier and integrated provider of energy infrastructure and technology solutions for the natural gas, power and water markets in a LCIA arbitration under English law. The dispute concerns a construction project in Iraq.
• Representation of a leading international insurance group in an ICC arbitration under Brazilian law. The dispute concerned post-merger breaches of a share purchase agreement.
• Representation of a Dutch private financial holding and investment company in an ad hoc arbitration under Dutch law. The dispute concerned violations of a shareholders’ agreement.
• Representation of a shareholder in an LCIA arbitration under Luxembourg and New York law. The dispute concerned the acquisition of the shareholders’ interest in a global litigation funding firm.
• Representation of a consumer finance company in a AAA arbitration under New York law. The dispute concerned post-merger breaches of a share purchase agreement.
• Representation of an international financial services provider in a New York Commercial Division litigation concerning a project in the Dominican Republic.
• Representation of a Brazilian airline in the enforcement of an ICC award through the Cayman Islands Privy Council.
• Representation of a Brazilian airline in a bench trial in Florida federal court regarding the alleged breach of agreements for the sale of aircraft.
• Representation of a U.S. deep-ocean exploration and subsea mineral development company in an ICSID arbitration against Mexico. The dispute concerned the exploration of sedimentary phosphate sand deposits off the coast of the Baja California.
• Representation of a privately held Argentina business conglomerate in a breach of contract dispute before the Southern District of New York against the Republic of Argentina concerning the nationalization of a controlling stake in a state-owned Argentine energy and petroleum company.
• Representation of a privately owned medical technology and equipment manufacturing company in an ICDR international arbitration under California law. The dispute concerned technology theft and breaches of a shareholders’ agreement.
• Representation of an international road operator and concession company in a CAM-CCBC international arbitration under Brazilian law. The dispute concerned post-merger breaches of a share purchase agreement.
• Representation of a Spanish multinational engineering and clean technology company that specializes in infrastructure, energy, and water sectors in an ICC international arbitration under California law. The dispute concerned an energy construction project in Oregon.
• Representation of an individual shareholder in an AAA arbitration against a global electronics and automation company under California law. The dispute concerned post-merger breaches of a share purchase agreement.
• Represented a products and services provider from Angola in an ICC arbitration under Angolan and California law. The dispute concerned services provided to an oil refinery’s operations in a harbor in Angola.
• Representation of an Eastern European high net worth individual in a VIAC international arbitration under California law. The dispute concerned the breach of investment agreements.
• Representation of a California agribusiness enterprise and one of the world’s largest privately owned farms in a LCIA arbitration under English law. The dispute concerned allegations of Sherman Act antitrust conspiracy relating to the sale of cotton in India.
• Representation of a big four accounting firm in efforts to re-design their dispute resolution mechanisms throughout Latin America.
• Representation of a California manufacturer in a AAA arbitration under Nevada law. The dispute concerned a public works water project in Nevada.
• Representation of a Brazilian distributor in a CAM/CCBC arbitration under Argentine law. The dispute concerned the distribution of wine from Argentina in Brazil.

Marcio Vasconcellos represents clients in high-stakes international commercial and investment disputes, along with general domestic and international litigation. Marcio has represented clients under most institutional rules and across a broad spectrum of industries, including oil and gas, electric power, mining, transportation, manufacturing, and pharmaceuticals. He has broad experience in matters involving Latin America and Brazil.

With more than 15 years of litigation and arbitration experience in Brazil and the United States, Marcio has a particular focus on corporate and post-merger disputes. He received an LL.M. in international arbitration from Pepperdine University (2016), where he was a research assistant to Professors Thomas Stipanowich and Jack J. Coe Jr., and coach of Pepperdine’s Vis Moot team. In connection with those studies, he was a recipient of a full-tuition scholarship from JAMS. Marcio holds an LL.B. (2010) as well as a master’s degree in international commercial contracts (2014) from the Federal University of Rio Grande do Sul, Brazil.

In addition to his practice, Marcio was formerly an Adjunct Professor of Law at Pepperdine University School of Law, where he taught International Commercial Arbitration – Theory & Doctrine. He was also a Lecturer in Law at USC-Gould – University of Southern California School of Law, where he taught advanced oral advocacy.  Marcio was also the Chair for the Los Angeles Chapter of the Chartered Institute of Arbitrators – North America Branch.

Prior to joining King & Spalding in 2021, Marcio practiced from 2010 to 2015 in Brazil, where he was an associate with a global firm and a junior partner with a commercial law boutique in Porto Alegre and Sao Paulo, Brazil. Between 2017 and 2020 Marcio as an associate with a leading, full-service California firm, practicing international and domestic arbitration and related litigation.

A frequent speaker and author, Marcio is fluent in English, Portuguese, and Spanish.

ADMITTED TO PRACTICE IN NEW YORK, CALIFORNIA, ILLINOIS, AND BRAZIL