Ms Bertha Arguello > Arias > Managua, Nicaragua > Lawyer Profile


Work Department

  • Banking and Finance
  • Corporate and Commercial
  • Energy
  • Mining
  • Labour




She holds a masters degree in law from Harvard Law School and a Juris Doctor degree from Universidad Autónoma Centroamericana in San José, Costa Rica. Bertha has been an authorized attorney and notary public in Nicaragua since 2000.

Bertha M Argüello has been part of the firm since 2003 and advises clients in banking and finance, corporate and commercial and mining matters, she has coordinated and advised in the opening and acquisition of several banks and financial institutions in Nicaragua, as well as acting as counsel in restructuring, regulatory and compliance matters. She has also advised on both local and international corporations in financing and investment transactions as well as security structuring in the country and the Central American region.

Bertha has also been legal advisor to local companies and foreign entities looking to invest in Nicaragua, including assistance on labor and organizational matters. She has been a member of the board of a supervised financial institution since 2016, as well as its risk and compliance committees, representing client interests and contributing to strengthening the entity’s presence nationwide. Bertha also advises clients on complex financing arrangements and security structures for both regulated and non-regulated entities. Her experience also includes working in Arias’ expanding labour department, advising clients on diverse employment matters, as well as general management and corporate solutions.


  • Spanish 
  • English


International Bar Association (IBA)


  • Law degree from the Universidad Autonoma de Centro America in San José, Costa Rica.
  • Authorized to practice law and as a Notary Public in Costa Rica and Nicaragua.
  • Master of Laws degree from Harvard University School of Law.

Lawyer Rankings

Nicaragua > Corporate and finance

(Leading individuals)

Bertha ArgüelloArias

The powerhouse team at regional firm Arias remains a market leader, bringing strength to advising major financial institutions and multinational corporations on a comprehensive range of matters, including high-value, cross-border M&A, joint ventures, project finance, antitrust, compliance, concessions and credit agreements. The firm’s broad client base spans sectors ranging from banking, apparel, tech, financial services, and food and beverages to pharmaceuticals, energy, telecoms and professional services. The team is led by managing partner and foreign investment authority Ana Teresa Rizo; Bertha Argüello, an expert in financial regulatory compliance; Gustavo-Adolfo Vargas, a specialist in advising multilateral institutions on the granting of credits, including the structuring and negotiation of agreements; and Rodrigo Ibarra, who handles matters involving hydrocarbons, renewable energies, ports, and infrastructure. Key support is provided at the associate level by Maryeling Guevara, who handles complex due diligence for acquisitions, and Uriel Balladares, who manages tax law and fiscal planning issues.

Central America > Corporate and finance

Formed following the split of pioneering Central American firm Arias & Munoz, Arias has a well-established network of seven offices in the region, spread across Guatemala, El Salvador, Honduras (where it has branches in both Tegucigalpa and San Pedro Sula), Nicaragua, Costa Rica and Panama. The firm has a long history of handling high-profile local and international M&A and financial transactions, acting for an impressive roster of multinationals, global financial institutions and leading regional banks. Diego Gallegos, who has expertise in asset and project finance, and Vicente Lines, an expert in the infrastructure and telecoms spaces, lead the finance practice in Costa Rica and are also key figures in the corporate team, where energy specialist Melania Dittel is also noted. In El Salvador, Mario Lozano is sought after for his advice on fintech and cryptocurrency issues, while Lilian Arias, the M&A-focused Roberta Gallardo and Luisa Rivas are among the key contacts for corporate matters. In Guatemala, Luis Pedro del Valle, who has a strong track record in cross-border M&A, took over leadership of the corporate and finance practices in April 2023. The highly experienced Evangelina Lardizábal steers the corporate and finance teams in Honduras alongside Mario Agüero, while in Nicaragua Ana Teresa Rizo, a go-to partner for foreign investments, Bertha Argüello, Gustavo-Adolfo Vargas and Rodrigo Ibarra, a specialist in the energy sector, are the names to note. María Cristina Fábrega takes the lead on M&A and financial transactions in Panama.