Martínez de Hoz & Rueda > Buenos Aires, Argentina > Firm Profile

Martínez de Hoz & Rueda

Energy and natural resources > Oil and gas Tier 1

A dominant force in the country’s oil-and-gas industry, Martínez de Hoz & Rueda is a reference point for local and international clients seeking advice on oil-and-gas exploration, production, transportation, distribution and marketing. Operating out of offices in Buenos Aires and Neuquén (Argentina’s shale gas industry hub), the team has also carved out a market-leading position in relation to hydrocarbon concession extension agreements and renegotiations, and is active in unconventional hydrocarbons operations and the development of LNG projects too. The firm’s large roster of retained international clients also rely on the team for support on multi-party, multi-contract commercial arbitrations arising out of cross-border transactions. The formidable energy law veteran José Martínez De Hoz brings vast hydrocarbons and associated arbitration expertise to the table. He co-leads the practice alongside fellow oil-and-gas industry stalwart Pablo Rueda and dynamic younger partner Tomás Lanardonne, who fronts the firm’s Neuquén base and has wide ranging transactional and regulatory expertise. From a strong associate bench, Marcos Blanco (oil-and-gas, project finance, M&A, and dispute resolution) and Valeria Celesti (hydrocarbons matters) are both noted. Since publication, Blanco has been raised to the partnership – effective January 2024.

Practice head(s):

José Alfredo Martínez de Hoz; Pablo Rueda; Tomás Lanardonne


Extensive knowledge of oil-and-gas regulations and excellent support of clients.

The lawyers at Martínez de Hoz & Rueda assist most of the relevant oil-and-gas companies in Argentina. They have wide and varied experience on the problems of the sector and know how to respond.

Experience, responsiveness, teamwork, professionalism and specialisation are the team’s best attributes. Notable names are José Martínez, Jose Martínez de Hoz (h), Pablo Rueda and Tomás Lannardone. Two young lawyers – Milagros Lezica and Valeria Celesti – stand out.

Key clients


Chevron Corporation and Chevron Argentina

Compañía de Hidrocarburo No Convencional

Compañía General de Combustibles

Compañía MEGA

Delta Patagonia



ExxonMobil Exploration Argentina

Gasoducto Atacama Chile

International Financial Corporation

Madalena Energy

Mitsui & Co

Oleoductos del Valle

Pan American Energy Group

Patagonia Energy

PECOM Servicios de Energía

Petroquimica Comodoro Rivadavia

Phoenix Global Resources


President Petroleum

Schlumberger Production Management


Total Austral

Trafigura Group

Transportadora Gas del Sur

Tullow Oil

Wintershall DEA Argentina


Work highlights

  • Advising Argentina’s national oil company, YPF, on a project to revamp the Oleoducto Trasandino pipeline, enabling the export crude oil to ENAP, Chile’s National Oil Company.
  • Advising YPF on an integrated LNG project that includes an offshore floating flange and an onshore greenfield liquefaction facility, as well as associated dedicated natural gas transportation facilities and up-stream development.
  • Advising Oldelval – the largest crude oil midstream player of Argentina – on the Duplicar Expansion Project, which involvesthe significant expansion of a 500 km crude oil pipeline.

Energy and natural resources > Electricity Tier 2

Martínez de Hoz & Rueda handles matters across the energy generation (hydro, thermal and renewable), distribution and transmission supply chain, with renewable energy, -particularly in the nascent hydrogen space- an active area. The team is well-versed in power sector regulation and is known for advising credit agencies and banks on the design of complex financing structures for conventional and renewable energy projects. Clients also call on the firm for representation before federal authorities and regulators to obtain permits, concessions, licenses, extension requests and contractual amendments, along with challenges to administrative acts and rulings. Public law expert Juan Cruz Azzarri has extensive public utilities and power industry experience and co-leads the practice with current firm managing partner Jimena Vega Olmos, who focuses on public law, infrastructure, power, project financing and international arbitration, and has a strong thermal and renewable energy practice. The team can also draw on the vast experience of firm founders and oil-and-gas veterans José Martínez De Hoz and Pablo Rueda. Since publication, Marcos Blanco, whose practice areas include power, renewable energy, oil-and-gas and TMT, has been promoted to partner, effective in January 2024.

Practice head(s):

Juan Cruz Azzarri; Jimena Vega Olmos


They are very business oriented and provide practical solutions.

Key clients

Fortescue Future Industries



Corporación Andina de Fomento




Green Power Renewables

International Finance Corporation

Jinko Power



Orazul Energy

Parque Eólico Arauco



YPF Energía Eléctrica

Pan American Energy


Work highlights

  • Representation of Neoen in all legal aspects of its operations in Argentina, including the development of two solar PV projects in the Province of Salta.
  • Assisting Greenmap with the design, structuring and implementation of an international guarantee trust for renewable energy projects (iTrust).
  • Advised Goldwind on all legal matters pertaining to the development of five wind farms in Argentina, with an aggregate capacity of 350MWs.

Argentina > Banking and finance Tier 3

Martínez de Hoz & Rueda is best known for its outstanding energy industry pedigree, where it provides a blue chip oil-and-gas and renewable energy client base with high-end advice on sophisticated, cross-border capital markets and financing matters. In addition to its high quality corporate client portfolio, the ‘bright, detailed-oriented’ team is called on by underwriters too – including various global and international financial institutions – to work on debt issuances, liability  management transactions and exchange offerings. Outside of the core energy sector, the team also handles work in the agribusiness and theme park industries, and has been an active player in the sovereign and sub-sovereign area, where it has advised on sizeable debt restructurings. The practice is co-led by ‘exceptional transactional lawyerJosé Martínez De Hoz (n), who advises borrowers and banks on cross-border and domestic financings; and the experienced Martín Lepiane, whose practice spans project and trade finance, banking regulation and litigation. Versatile partner Jimena Vega Olmos, who works on a range of corporate, banking and arbitration matters, provides further senior level experience, with the ‘excellent’ Pablo Schreiber (who has worked as foreign associate in the New York and Sao Paulo offices of Simpson Thacher & Bartlett) and Luisina Luchini leading the practice’s second line. Since publication, Schreiber has been promoted to the partnership - effective as of January 2024.

Practice head(s):

José Martínez de Hoz (n); Martín Lepiane


José Martinez de Hoz (n), Martin Lepiane and Jimena Vega Olmos are excellent benchmarks of professionalism, dedication and ability to carry out excellent work.

The  team is available 24/7, always very enthusiastic and proactive, and technically excellent.

The entire team demonstrates a very good attitude, even when deadlines and orders are demanding. They always provide practical solutions adapted to the needs of the business. José Martínez de Hoz (n), Jimena Vega Olmos and Luisina Luchini stand out.

The team is fantastic – bright, detail-oriented counsel. Commercially-minded.

Jose Martinez de Hoz (n) is an exceptional transactional lawyer. Count on him for first-rate advice, a detailed eye for documentation, strong negotiating skills and market knowledge.’

Senior associate Pablo Schreiber is an excellent, up and coming lawyer in the market.

I would highly recommend associate Luisina Luchini on complex corporate transactions.

The MhR team is fantastic – bright, detail-oriented counsel. Commercial-minded and conversant not only on transaction minutiae, but also the market as a whole. I would call them a real “up-and-coming” firm in the Argentine market on cross-border deals — but the reality is that they have already arrived! Would recommend them strongly to anyone seeking Argentine lawyers for complex, cross-border matters.

Key clients

International Finance Corporation

Bank of America

Corporación Andina de Fomento

Pan American Energy

Banco de Galicia

BCP Securities

Credit Agricole Corporate and Investment Bank

Agence Française de Développement




Deutsche Bank

China Development Bank

Banco de Valores


President Petroleum


YPF Energía Eléctrica (YPF Luz)


Contrarian Capital Management


Banco Mariva

Banco Patagonia

Work highlights

  • Advised Pan American Energy on an international exchange offer for outstanding 5% senior notes (due 2023) for newly issued 7.25% senior notes (due 2025).
  • Advised BofA Securities and BCP Securities on the international exchange offer for Edenor’s outstanding 9.75% senior notes (due 2022) for newly issued 9.75% senior notes (due 2025) and cash.
  • Advised Pan American Energy in a syndicated loan transaction denominated in pesos and worth $300m. The loan was granted by 16 Argentine banks and largest local syndicated loan in Argentina for a decade.

Argentina > Compliance Tier 3

Martínez de Hoz & Rueda leans on its extensive energy industry expertise to support clients on infrastructure and banking compliance matters. Experienced transactional and regulatory lawyer Martín Lepiane is the key compliance contact.

Practice head(s):

Martín Lepiane

Argentina > Corporate and M&A Tier 3

Best known for its formidable presence in energy M&A, Martínez de Hoz & Rueda’s efforts to widen its presence in other sectors has reaped dividends, with the number of non-energy transactions exceeding energy-related M&A work for the first time since the firm’s inception. Moreover, the firm has established a new corporate governance structure (as of August 2023) to further align its dual commitments to ongoing growth and institutionalisation. While oil-and-gas mandates remain the single biggest generator of fee income, the practice has successfully won an increasing volume of transactional and day-to-day corporate work in the financial services, consumer and technology industries among others. Practice head Fernando Zoppi is an experienced M&A lawyer and handles all types of M&A transactions, advising private equity and VC players, energy companies and telecoms groups among others. Partner Tomás Dellepiane’s all-round corporate experience is complemented by an active M&A practice, with the team also able to call on finance practice co-head Martín Lepiane and highly-respected energy lawyer José Martínez De Hoz for additional senior back-up. Transaction-focused associate Marcos Blanco leads the practice’s second line, which has been bolstered with the April-2022 hire of Sofia Reymundo, previously with Tanoira Cassagne Abogados.

Practice head(s):

Fernando Zoppi


The lawyers are easy to understand and focus on how to find solutions.

A responsive team with good international contacts.

Fernando Zoppi is a great lawyer, with US training and experience and solid business accumen.

A strong M&A team, with an unmatched expertise in the oil and gas sector.

Very good team that complements each other well and always gives answers on time.

Dedicated professionals, with knowledge and resources.


Key clients



Inter-American Investment Corporation



Delta Patagonia

Pan-American Energy

Bodegas López








Cross Capital


Evo Payments

Fortescue Metals Group

Work highlights

  • Represented EVO Payments, the global payment processing business, in the acquisition of assets in Argentina and other countries in Latin America from the Wobiz Group.
  • Assisted e-commerce aggregator Wonder Brands with a cross-border transaction involving the acquisition of 65% of the capital stock of Latin American e-commerce platform Electroventas.
  • Assisted Patagonia Energy with a complex transaction involving the acquisition of a shale concession in the Aguada del Chivato-Aguada Bocarey block (located in the Vaca Muerta), from Medanito.

Argentina > Dispute resolution Tier 3

Clients call on Martínez de Hoz & Rueda for support in high-stakes disputes that involve complex transactions, multiple contracts and which often involve parallel proceedings in more than one jurisdiction. The practice is probably best known for its undertaking of international investment and commercial arbitration, and is comfortable handling cases under a range of different arbitration rules, including ICC, AAA/ICDR, LCIA, ICSID and UNCITRAL. The firm's wider strength in the energy sector brings in work from global energy companies seeking advice on landmark international litigations and the annulment and enforcement of arbitral awards. Highly respected arbitration veteran and founding partner José Martínez De Hoz co-leads the team alongside international and commercial arbitration practitioner Francisco Amallo.

Practice head(s):

José Martínez de Hoz; Francisco Amallo


Argentina > Public law Tier 3

Martínez de Hoz & Rueda leverages its deep expertise in the highly regulated hydrocarbons and electricity sectors to deliver advice across a variety of public law matters, including concessions, licenses, authorisations and representations in public tenders. The team also has strong dispute resolution capability, assisting and representing clients in various administrative, judicial and arbitral proceedings. Juan Cruz Azzarri has extensive experience across public law, public utilities, public contracts and infrastructure matters. He co-leads the practice with managing partner Jimena Vega Olmos, whose practice encompasses public law, international arbitration, infrastructure, power and project financing.

Practice head(s):

Juan Cruz Azzarri; Jimena Vega Olmos

Argentina > Competition and antitrust Tier 4

Martínez de Hoz & Rueda represents companies before Argentine Antitrust Authorities and is frequently called on to advise clients on transactional filings and merger clearances. Juan Cruz Azzarri, an experienced administrative and constitutional law specialist, is the main point of contact.

Practice head(s):

Juan Cruz Azzari

Argentina > TMT Tier 4

Technology companies as well as corporates in other sectors call on Martínez de Hoz & Rueda for advice on a range of tech-related matters, including software licenses, data protection, privacy, cybersecurity, cloud computing and IT law. The team also works on regulatory and contractual issues, with corporate digital transformation -most notably in the banking sector- a particularly busy area. Martín Lepiane -whose practice tales in the banking, finance and TMT spaces- co-leads the team with senior associate Marcos Blanco, who handles privacy, data protection and fintech matters. Since publication, Blanco has been promoted to partner - effective as of January 2024.

Practice head(s):

Martín Lepiane; Marcos Blanco

The firm: Martinez de Hoz & Rueda (MHR) is a full-service powerhouse in Argentina that combines the prominent expertise and experience of corporate, finance, dispute resolution, tax and regulatory lawyers with the undisputed leadership of the best energy team of the country.

Accordingly, MHR offers:

  • deep industry specific knowledge
  • solid transactional experience and capabilities
  • innovative and sound legal advice
  • optimally staffed teams and tech solutions to deliver efficient and added value outcomes.

MHR is headquartered in Buenos Aires, and it is the only full-service law firm with an office in Neuquen (Vaca Muerta, in the Argentine Patagonia). Further, the firm has correspondents throughout Argentina and has developed close and solid working relationships with first-tier law firms around the world. The team at MHR has also gained a reputation for representing clients in transactional and disputes resolution matters across Latin America.

MHR’s focus is on understanding our clients’ business, goals and needs as a critical condition to provide the finest legal services for them.

Areas of practice: MHR’s lawyers have been playing a key role in the Argentine legal market for more than 25 years, and their acclaimed first-class services are now enhanced by MHR’s state of the art platform that includes the latest technologies and first-class offices.

Department Name Email Telephone
Corporate and M&A Fernando Zoppi 54 11 2150 9779
Banking and finance Jose Martinez de Hoz(n) 54 11 2150 9779
Bankruptcy and restructuring Martín Lepiane 54 11 2150 9779
Competition and antitrust Juan Cruz Azzarri 54 11 2150 9779
Dispute resolution José A. Martinez de Hoz 54 11 2150 9779
Energy and natural resources José A. Martinez de Hoz 54 11 2150 9779
Environment Pablo Rueda 54 11 2150 9779
Insurance Maximiliano Batista 54 11 2150 9779
International trade and customs Martín Lepiane 54 11 2150 9779
Labour and employment Rodolfo Vedoya 54 11 2150 9779
Public law Juan Cruz Azzarri 54 11 2150 9779
Real estate Francisco Amallo 54 11 2150 9779
TMT Maximiliano Batista 54 11 2150 9779
Tax Maximiliano Batista 54 11 2150 9779
Corporate Tomás Dellepiane 54 11 2150 9779
Photo Name Position Profile
Fernando Zoppi photo Mr Fernando Zoppi Partner
Partners : 11
Associates : 27
Paralegals / law clerks : 4
other personnel : 8
IBA (International Bar Association)
ICC Arbitration Centre (court member)
ABA (American Bar Association)