Arias SLP

Arias SLP is a Madrid-based law firm, dedicated to international arbitration and litigation.

Established in 2013, the firm boasts ample expertise and experience in the field of dispute resolution. It offers insightful expert advice and first-class legal representation in all types of international commercial and investor-State disputes.

Since its inception, Arias SLP has been recognized as one of the leading dispute resolution firms. The firm represents clients in complex and high value disputes before arbitral tribunals and the Spanish courts. Arias SLP also provides advice on dispute management and avoidance. Many of its lawyers are highly sought-after to act as arbitrators. Their experience within arbitration panels composed of the most recognised arbitrators gives them unique insight into the dispute resolution process.

Arias SLP has handled a broad spectrum of commercial and investment arbitrations as well as arbitration-related litigation. Its partners have acted as counsel and served as arbitrators in hundreds of arbitrations, conducted under the rules of all major arbitral institutions, such as the ICC, ICSID, PCA, LCIA, AAA/ICDR, SCC, FAI, CAS, the Swiss Arbitration Centre, as well as in UNCITRAL and ad hoc arbitrations.

Between 2022 and 2025, the firm’s partners have acted as counsel and served as arbitrators in 74 arbitrations, involving 49 jurisdictions, with an amount in dispute totalling USD 13.2 billion, in various areas such as engineering & construction, infrastructure and energy, corporate/M&A, cross-border transactions or banking & finance.

Arias SLP’s clients include European and international companies, ranging from SMEs to multinational corporations.

■ Representing Spanish companies in an arbitration brought by a Spanish SPV owned by a Chinese investment group in relation to a dispute arising under an agreement for the acquisition of a Spanish company (ICC, Paris, Spanish law, English)

Partners: Luis Capiel, Diego Sobejano

■ Representing a Spanish polymer distribution company in an arbitration brought by a US trading company of petrochemical products in relation to a dispute arising under a joint venture agreement, a shareholders' agreement and a supply agreement (ICC, Madrid, Spanish law, English)

Partners: Luis Capiel, Diego Sobejano

■ Representing a Portuguese investor in an arbitration against an African State in relation to a dispute arising from the seizure of four gas turbines (ICSID, Washington D.C., Spanish/English)

Partners: David Arias, Luis Capiel

■ Representing a Latin American subsidiary of a German multinational in an arbitration against a Latin American state-owned petroleum company in relation to a dispute arising from an agreement for the construction, operation and maintenance of a training and simulation centre for offshore oil production (ICC, Latin American city, law of a Latin American country, Spanish)

Partner: Luis Capiel

■ Representing a Spanish renewable-energy company in an arbitration against a Chinese solar panel manufacturer in relation to a dispute arising from solar panel supply agreements for solar farm projects in Brazil (ICC, Frankfurt/Madrid, Spanish law, English/Spanish)

Partner: Luis Capiel

■ Representing a Singapore-based global energy company in an arbitration against a Spanish multinational energy utility in relation to a dispute arising from a deal on the transfer of an LNG portfolio and the supply of natural gas (CIMA, Madrid, Spanish law, English)

Partners: David Arias, Luis Capiel

■ Representing a Colombian infrastructure concession company in an arbitration against a Spanish construction company in relation to a dispute arising from an EPC contract for the construction of motorways (ICC, Madrid, Colombian law, Spanish)

Partners: David Arias, Luis Capiel, Oliver Cojo

■ Representing a real estate company before Spanish courts in a dispute arising from breach of an asset management contract

Partners: Luis Capiel, Diego Sobejano

■ Arbitration between African parties arising from a power sales agreement (ad hoc, London, law of an African State, English)

Presiding arbitrator: David Arias

■ Arbitration between Latin American parties arising from agreements for the transportation of liquefied natural gas (ICC, Mexico City, Mexican law, English)

Presiding arbitrator: David Arias

■ Arbitration between two Latin American companies arising from an EPC contract for the rehabilitation of a highway (ICC, Miami, Colombian law, English)

Presiding arbitrator: David Arias

■ Arbitration involving various parties in relation to a dispute arising from a highway concession contract in a Latin American State (ICSID, Washington D.C., Spanish).

Co-arbitrator: David Arias

■ Arbitration between various companies from Europe and America in relation to a dispute arising from an oil supply agreement and other related agreements (LCIA, London, law of a European State, English)

Presiding arbitrator: David Arias

■ Sole arbitrator in an arbitration between a Uruguayan company and companies from Lithuania and Uruguay in relation to a dispute arising from a contract for scaffolding services provided in a pulp mill project (Finland Arbitration Institute, Helsinki, Uruguayan law, English)

Sole arbitrator: Luis Capiel

■ Arbitration between a Chinese engineering company and an Italian EPC contractor in relation to a dispute arising from the supply of electric equipment for a solar plant (ICC, Madrid, Spanish law, English)

Co-arbitrator: Luis Capiel

■ Arbitration between a Spanish company and a Portuguese company in relation to a dispute arising from a maintenance agreement (ICC, Madrid, Spanish law, Spanish)

Sole arbitrator: Oliver Cojo