Agustín Siboldi > Estudio O'Farrell > Buenos Aires, Argentina > Lawyer Profile

Estudio O'Farrell
AV. DE MAYO 645/651

Work Department

Energy & Natural Resources - Telecommunications, Media & Entertainment - Competition/Antitrust - Pharmaceutical & Health


Agustín Siboldi, a partner of the Public Law and Economic Regulation Department, specializes in Antitrust, Energy and Natural Resources, and Telecommunications.

His practice focuses on the following areas in relation to economic regulation: antitrust, including economic concentrations and investigations in anticompetitive practices; telecommunications; exploration, concession, exploitation and transport of hydrocarbons; generation, transmission, distribution and commercialization of electricity; transport, distribution and commercialization of gas; commercialization of medicines; among other heavily regulated industries.


He joined O´Farrell in 1998 and is partner since 2007. He is a professor of ESEADE since 2001 in Economic Regulation (Public Utilities Regulation and Antitrust) as well as at the AADT. He used to teach at the Universidad de Buenos Aires, in Civil and Commercial Contracts.


Spanish, English and Portuguese.


Member of AADT, International Bar Association, Instituto Argentino de Petróleo y Gas, Foro Competencia, City of Buenos Aires Bar, Brazilian-Argentine and Mexican-Argentine Chambers of Commerce.


Mr. Siboldi is a regular professor of the Economic Regulation course at Escuela Superior de Economía y Administración de Empresas (ESEADE), which includes regulation of telecommunications, energy and antitrust matters. At the Argentine Association of Telecommunications Law, he teaches the course in Comparative Law: Telecommunications and Economic Regulation.

In addition, he is a former professor of the Theory of Civil and Commercial Agreements course at the teaching course of studies of Universidad de Buenos Aires Law School.

Lawyer Rankings

Argentina > Competition and antitrust

(Leading individuals)

Agustín SiboldiEstudio O’Farrell

The ‘well-informed’ team at Estudio O’Farrell is praised for its ability to ‘adapt to the circumstances’. The team advises on a wide range of merger-control and behavioural matters, drawing upon the wider firm’s signature regulatory expertise to focus on advising clients in the energy, telecoms and public utility spheres. Public law and economic regulation specialist Agustín Siboldi heads the group, with support from administrative law partner María Agustina Fanelli Evans.

Argentina > TMT

(Leading individuals)

Agustín SiboldiEstudio O’Farrell

Estudio O’Farrell’s practice is significantly weighted towards regulatory work, including administrative litigation and competition law-related cases. The team is particularly active on the telecoms side, due in no small part to its close relationship with Claro Argentina, but it also has experience in the technology and media sectors. Department head Agustín Siboldi, who sits in the public law and economic regulation department, specialises in telecoms matters.

Argentina > Environment

Estudio O’Farrell’s environmental law practice is weighted towards administrative law matters, with a prominent record in advising clients on complex litigation — it also handles due diligence and compliance issues. The firm’s presence in the power, telecoms and oil-and-gas sectors are the key drivers of work. Public law and economic regulation partners Jorge Muratorio, María Agustina Fanelli Evans and Agustín Siboldi are the key contacts.

Argentina > Energy and natural resources > Electricity

(Leading individuals)

Agustín SiboldiEstudio O’Farrell

Estudio O’Farrell’s highly regarded team is comprised of ‘specialists with an integral vision and highly qualified knowledge in the different aspects of the market’, according to sources. The firm packs a punch in all key pillars of electricity law, with strong skill sets in regulatory, transactional and contentious matters. On the regulatory front, the multidisciplinary practice advises some of the country’s largest power companies (including YPF Energía Eléctrica, Pampa Energía and Transener) on regulatory compliance and administrative challenges. On the transactional side, the group is routinely engaged by energy companies seeking support on M&A, joint ventures and project finance. It also excels in complex litigation, where its ability to lean on the firm’s robust public law and economic regulation departments is a significant asset. Senior partner Uriel O’Farrell is a stand-out specialist in the power area, with premier sector expertise in M&A, privatisation transactions, regulation and dispute resolution. Other key contacts include economic regulation specialist Agustin Siboldi, who is highly regarded for his experience in regulatory and contentious matters, and Agustina Fanelli Evans, who is recommended for her strength in public law issues.

Argentina > Energy and natural resources > Oil and gas

Estudio O’Farrell stands out for its ‘vast experience’ and ‘highly qualified specialists’. The team is best known for its regulatory expertise, in line with the firm’s signature strength, and it notably played a significant role in the development of the hydrocarbons regime in Argentina through its close relationship with state-controlled energy company, YPF. The team also frequently advises on transactional and contentious matters. Senior partner Uriel O’Farrell co-heads the team and is recognised for his broad energy practice, which spans power, oil and gas. Group co-lead Agustín Siboldi specialises in public law and economic regulation.