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 the Congress in drafting and enacting new legislation, and has taken an active role in supporting university education.

PSTBN offers a broad range of legal services for clients involved in international and local transactions in Paraguay. Firm specialization includes mergers and acquisitions, foreign investment, maritime and aviation, telecommunications, banking and international finance, mineral and oil exploration projects, labor relations, general civil litigation, taxation, counseling before local government agencies and legislative bodies, maquila projects, franchising and 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. 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), Temas de Derecho Tributario (Tax Law Matters), Regimen de Maquila (Maquila Regime) and Ley 125/91 Comentado y Concordado (Tax Law 125/91).

Casa de la Independencia


PSTBN is a member of several renowned international law firm networks and alliances. These memberships help our clients operate their businesses across borders and cultures with deep understanding of international law and customs, allowing them to expand their capabilities in new markets around the globe.


Lex Mundi is an exclusive worldwide network of renowned independent law firms which facilitates the exchange of professional information about local and international practices. Through close collaboration, Lex Mundi member firms deliver new perspectives that are key to innovation in today’s markets. It provides the resource that today’s cross-border business environment demands, providing connections that the clients need to meet the challenges of doing business anywhere in the world.

Founded in 1966, the Iberoamerican Club de Abogados is a comprised of 21 law firms from Latin America and Europe. Each country is represented by only one leading firm in its home market, providing solid local knowledge, expertise, connections and capabilities helping clients to develop groundbreaking strategies in any industry, at all levels.

Insuralex is a global network of insurance and reinsurance lawyers, dedicated to the insurance and risk management communities. Insuralex works for a wide range of clients, including insurance and reinsurance companies, Lloyd's syndicates, insurance, and reinsurance brokers. Each member of Insuralex is considered a leader in this specialized area of practice in their respective national jurisdiction.

Iconekta, an ecosystem that offers trusted Legaltech solutions. The first Legaltech in Latin America focused on generating income for lawyers and their clients.

Founded in 1990, Meritas is the premier global alliance of independent law firms working collaboratively to provide businesses with qualified legal expertise. This is an invitation only alliance, which provides access to 7,096 experienced lawyers in 180 renowned law firms working in 235 different jurisdictions.


PSTBN and its attorneys devote significant time to the attention of pro bono matters, to Foundations and Non-Governmental Organizations. Members of the Study advise, form or have been part of the Board of Directors of:

Fundación Paraguaya de Cooperación y Desarrollo

Paraguay Green Building Council

Fundación Moisés Bertoni

Centro Cultural Paraguayo Americano

Camara de Comercio Paraguay Brasil

Fundación ALDA

Camara de Comercio Paraguayo Americana

Fundación AMCHAM

Camara de Comercio Paraguayo Argentina

Camara de Comercio Paraguayo Chilena