Peroni Sosa Tellechea Burt & Narvaja > Asuncion, Paraguay > Firm Profile

Peroni Sosa Tellechea Burt & Narvaja

Paraguay > Corporate and M&A Tier 1

A fixture in the Paraguayan corporate law market for over 50 years, Peroni Sosa Tellechea Burt & Narvaja remains a go-to firm, whose client base has a strong domestic presence, be it homegrown companies or multinational stakeholders. Though it maintains a wide-ranging practice, a standout specialism of the team is in the transport sector, even more specifically in shipping, where a highlight in 2020 saw Francisco Peroni acting as lead counsel to Imperial Shipping on the sale of its Paraguayan companies conducting waterborne transportation services. Two lawyers with extensive experience co-head the practice: Esteban Burt acts for international clients in foreign investments, as well as mining and oil-sector operators and leading aviation companies in their relationships with state entities; and Marcos Peroni, who advised on a number of matters in the insurance, distribution and entertainment sectors during 2020. Victoria Burt is the main contact for corporate compliance matters, heading that sub-team, and Eduardo Alfaro has niche expertise in investments obtaining tax incentives granted under Law 60/90 and Maquila Law. Also noted is associate Vanessa Oddone, who has recently brought a number of new clients to the practice.

Practice head(s):

Esteban Burt; Marcos Peroni


The firm has a unique perspective to understand the needs and context in which the client who needs advice develops, with a depth that is one of a kind.

In my experience, I have always received more than one valid legal opinion. They have been able to give me perspective, scenarios, etc.

Guillermo Peroni and Esteban Burt, for me, are exceptional professionals in their field.

Esteban Burt is a top-notch corporate attorney. He has very solid technical knowledge and remarkable business acumen and experience.

Good predisposition, comprehensive advice that is not only limited to specifically answering the questioned points but gives added value to the work taking into account that as clients we need a global vision, and that is what distinguishes them from other firms.

Victoria Burt and Vanessa Oddone were very expeditious, they met the proposed objectives and within the stipulated deadline. They were able to adapt the changes in a practical way to the day-to-day operations of the company.

Key clients

Imperial Shipping Paraguay

Obras Terminales y Servicios (OTS)


Tam Mercosur

Latam Airlines Paraguay

Marubeni America Corporation


Trade Alliance

MAPFRE Paraguay Compañía de Seguros

Marubeni America Corporation


Establecimiento las Marias SAIC

Santa Rosa Paraguay

Perfecta Automotores – BMW Paraguay


Fortaleza de Inmuebles

Work highlights

  • Assisted Imperial Shipping Paraguay with the sale of the Paraguayan companies of Imperial Group conducting waterborne transportation services.
  • Advised Obras Terminales y Servicios (OTS) and Riverpar on the negotiation and execution of a long-term contract with Puma Energy, which owns approximately 200 gas stations in Paraguay.
  • Assisted Loma Negra and Yguazú Cementos with a share purchase agreement.

Paraguay > Dispute resolution Tier 2

'Providing good care and promptly responding to the cases presented', Peroni Sosa Tellechea Burt & Narvaja provides a comprehensive offering that handles complex cases in litigation, arbitration and alternative dispute resolution. Representation, agency and distribution agreements are key areas of expertise for the team, which is well versed in Paraguay's major industries, including agribusiness and shipping, while real estate and insurance are also sectors of strength. José Sosa Fracchia is the primary contact, leading the majority of matters and often supporting the corporate law team when relevant. Associate Fabrizio Forestieri is another name to note.

Practice head(s):

Enrique Sosa Elizeche; José Sosa Fracchia


This company is very professional and reliable in their advice. Moreover our relationship is friendly with all its team.

They are able to propose different options and can work in the real interest of their clients.

Key clients

Monsanto Paraguay

Man Truck & Bus


BASF Argentina

Touax River Barges

Jive Investments

Vicente Scavone & CIA

Hanseatica Compañía de Seguros

La Compagnie Francaise d’Assurance pour le Commerce Extérieur (Coface)

Mapfre Paraguay

Work highlights

  • Representing Monsanto Paraguay in arbitration proceedings brought by Agrofértil regarding an alleged breach of distribution contracts.
  • Defending Man Truck & Bus against a lawsuit filed by Paraguayan company Chispa for alleged wrongful termination of an auto-parts distribution agreement.
  • Representing BASF in a lawsuit promoted by Agrotec, a Paraguayan company, requesting compensation due to an alleged breach of a distribution contract.

Paraguay > Environment Tier 2

Peroni Sosa Tellechea Burt & Narvaja assists clients involved in the exploration of natural resources and hydrocarbons in obtaining prospective permits and concessions, as well as promoting innovation in contracts and mining regulations. Its advice also covers due diligence in relevant transactions, as well as contentious matters. José Miguel Sosa and Juan Carlos Boggino are the practice heads.

Paraguay > Intellectual property Tier 3

Peroni Sosa Tellechea Burt & Narvaja has a particularly active practice in the filing of trade marks and patents in Paraguay, where it acts for a mix of domestic and international companies, and assists foreign law firms on behalf of their clients. The team also advises on concessions and licensing of brand name products, as well as distribution, representation and agency rights contracts. A recent highlight saw practice co-heads Elba Britez de Ortiz and Juan Ortiz Britez representing a household name company in an anti-counterfeiting matter, where illegitimate items were seized and destroyed. Mariana Peroni completes the trio heading the team and has significant expertise in patents and industrial/utility models.

Practice head(s):

Elba Britez de Ortiz; Juan Ortiz Britez; Mariana Peroni


It is an excellent team. They respond immediately with smart solutions.

Always personalised attention from members. Immediate response. Pristine attention to detail in all matters. The best correspondent we have had in the country in years. It is a pleasure to collaborate with them and a peace of mind to have them in our corner.

The team responds quickly and efficiently to what is consulted.

Juan Ortiz has an excellent disposition and speed to answer questions.

Knowledge and prestige in the market. Family firm with high moral values ​​and enviable work ethic.

The professionalism they have, the attention they provide, the quick responses. Juan Ortiz is one of the key people in the firm, together with Elba Britez.

Juan Ortiz, a professional with a lot of experience and knowledge in intellectual property. Respected by all his colleagues in Paraguay.

It is a specialised firm trained in resolving controversies in IP and as it is a general practice firm, it can cover any required area.

Key clients

Starbucks Coffee Company

Toy Cantando

Compass Minerals

Genomma Lab International

Productos Farmacéuticos


Viterra Canada


Grupo Cartes



Bagó del Paraguay

Work highlights

  • Assisting Toy Cantando with the filing, protection and surveillance of its trade marks.
  • Assisting grain handler Viterra Canada with the filing, surveillance, management and protection of its trade marks.
  • Acting for Starbucks in monitoring its marks and logo in Paraguay in case of possible infringement, and sending cease and desists where necessary.

Paraguay > Labour and employment Tier 3

Peroni Sosa Tellechea Burt & Narvaja's two-strong employment department sees Ernesto Fiore, a labour law expert with 20 years of experience, working alongside key senior associate Alejandro Arrúa. The practice's client list is dominated by domestic companies and also includes multinationals with operations in Paraguay; its sector strengths are diverse, with key names in retail, shipping and manufacturing. Recent work has been dominated by instructions arising out of the pandemic lockdown, including mass employment suspensions, as well as litigation resulting from loss of employment. Former practice head Pelucia Gimenez left to join the Labour Court of Lambaré in February 2020.

Practice head(s):

Ernesto Fiore

Key clients

Bona Vista

UABL Paraguay

Fortaleza de Inmuebles

Kromberg & Schubert Paraguay


Comité Internacional de la Cruz Roja

Transportes Aéreos del Mercosur

Estudio de Ingenieria y Transporte

Imperial Shipping Paraguay

Work highlights

  • Acted for Bona Vista in negotiations with 59 employees for their suspension.
  • Advised Kromberg & Schubert Paraguay on negotiations with 181 employees over their suspension due to the Covid-19 pandemic.
  • Assisted Tam Mercosur/Latam Paraguay with a request to the Ministry of Labor to grant the temporary suspension of employees, due to the closure of the borders.

Paraguay > Tax Tier 3

Peroni Sosa Tellechea Burt & Narvaja's tax department assists with the relevant aspects of commercial and corporate transactions, and is also noted for its work in tax evasion investigations. Juan Carlos Boggino and Marcos Peroni are the two contacts to note.

Paraguay > Banking and finance Tier 4

Peroni Sosa Tellechea Burt & Narvaja's banking and finance team is headed by Graciela Narvaja, who has over 40 years of experience acting for financial institutions. Founding partner Guillermo Peroni also oversees this practice area, where he has a wealth of experience, particularly with foreign entities operating in Paraguay. Bond issuances and syndicated loan negotiations have featured prominently in the team's recent workload, with several deals involving international law firms that are advising clients dealing with Paraguayan companies or the state.

Practice head(s):

Guillermo Peroni; Graciela Narvaja


The cross-border banking solution is a niche practice and the service provided by the firm is commendable. We enjoy the cordial relationship with the firm and the partner, who helps to update the cross-border manual with high quality and flexibility to any clarification sought.’

Our main contact is Graciela Narvaja, with whom we have very cordial relationship. She provides us accurate and high-quality advice. She is very responsive and always meets the set deadline.’

Key clients

Wilmington Trust, National Association

Navios South American Logistics

Blue Orchard Investment Managers

Latitude 20 Capital Partners

Morgan Stanley International Wealth Management

Milbank London

Holland & Knight (UK)

Duane Morris

EY Global Delivery Services India

Work highlights

  • Advised Navios South American Logistics on a corporate $500m bond issuance.
  • Advised Wilmington Trust as a trustee in connection with a $100m bond issuance by Frigorífico Concepción.
  • Assisted Blue Orchard Microfinance Fund with the review of documents related to a $2m loan provided to Vision Banco of Paraguay.

Peroni Sosa Tellechea Burt & Narvaja (PSTBN) is one of the largest and most prestigious firms in Paraguay. Founded in 1968, the firm’s reputation stems from its commitment to serving the needs of clients in diversified areas of specialization. Over the last five decades PSTBN has been an active participant in legal innovation in Paraguay, advising the government on development strategies, working closely with Congress in drafting and enacting new legislation and taking an active role in supporting Higher Education.

PSTBN offers a broad range of legal services for clients involved in international and local transactions in Paraguay. Specialization includes corporate, mergers and acquisitions, foreign investment, distribution law and antitrust, maritime and aviation, telecommunications, banking and international finance, environmental, mineral and oil exploration projects, labor relations, general civil litigation, taxation, regulatory law and counselling before local government agencies and legislative bodies, maquila projects, investment incentives projects, franchising, licensing agreements and intellectual property matters.

Representation in the courts and administrative agencies of the government is an important activity of PSTBN, as plaintiffs or defendants in landmark cases, proof of such is that PSTBN is the only law firm that has had three current and former members elected as Supreme Court Justices.

The intellectual property department, supported by the latest technology, covers every aspect of trademark, copyright and patent practice and commercial use within Paraguay by foreign and local companies.

PSTBN specializes in foreign investments and taxation, and has published important reference books titled Paraguay, Laws and Economy, Commercial and Investment Law (Paraguay), Tax Law Matters, Maquila Regime, etc.

PSTBN was recognized as “Paraguayan Law Firm of the Year” for years 2009, 2012 and 2014 by Chambers Latin American Awards for Excellence.

PSTBN is a member of the prestigious law firm networks such as LEX MUNDI in which is a founding member, MERITAS, CLUB DE ABOGADOS IBEROAMERICANOS and INSURALEX.

Managing partner José Sosa Fracchia;
Corporate/Commercial Guillermo F Peroni:
Banking and Finance Graciela Narvaja:
Litigation and Dispute Resolution Jose Sosa Fracchia: jose.sosafracchia
Intellectual Property Elba Britez:
Labor and Employment Ernesto Fiore:
Immigration Jose Luis Vega Meza:
Environment Jose Sosa Fracchia: Jose.sosafracchia
Corporate/Commercial Esteban Burt:
Banking and Finance Marcos Peroni:
Intellectual Property Mariana Peroni:
Other fee-earners : 15
Total staff : 34
Insuralex (Global Insurance Lawyers Group)
Lex Mundi
Partners : 19