SIGMA International and Global Market Attorneys

Panama City, Panama

Founded in 2016 by Cecilio Castillero, SIGMA International and Global Market Attorneys is a boutique transactional law firm that has established itself as the first Panamanian office specializing solely in complex transactions. The firm focuses on high-level legal services in areas such as corporate and project financing, capital markets, mergers and acquisitions, and infrastructure contracts.

SIGMA International and Global Market Attorneys

Founded in 2016 by Cecilio Castillero, SIGMA International and Global Market Attorneys is a boutique transactional law firm that has established itself as the first Panamanian office specializing solely in complex transactions. The firm focuses on high-level legal services in areas such as corporate and project financing, capital markets, mergers and acquisitions, and infrastructure contracts.

SIGMA aims to provide innovative solutions and international quality standards, leveraging its attorneys’ extensive experience in top-tier global firms in New York and Washington D.C. Recognized consistently by Chambers & Partners and Legal 500, the firm harmonizes deep local expertise with a global perspective, ranking among the most prominent offices in Panama for sophisticated financial mandates.

  • Cecilio Castillero (Founding Partner)

    • Specialist in Banking & Finance and Projects & Energy.
    • Former Senior Counsel at Arias, Fábrega & Fábrega, Panama (2010–2016).
    • Former Associate at Milbank, Tweed, Hadley & McCloy LLP, New York (2000–2010).
    • Juris Doctor (Magna Cum Laude), Tulane University; LL.B., Columbus University.
    • Recognized as “No. 1 Banking Lawyer in Panama” by Lexology Client Choice Awards (2026) and Leading Individual by The Legal 500.

    Eric Carles (Associate)

    • Specialist in Project Finance, Capital Markets, and M&A.
    • Former Attorney at DLA Piper LLP, Washington D.C. (2017–2018).
    • Former Lawyer at Arias, Fábrega & Fábrega, Panama (2012–2016).
    • M. in Securities & Financial Regulation, Georgetown University Law Center.
    • Experienced in representing financial institutions in cross-border transactions across Latin America and Africa.
  • Banking & Finance
  • Projects & Energy
  • Mergers and Acquisitions (M&A)
  • Capital Markets
  • Infrastructure & Construction Contracts
  • Joint Ventures

SIGMA International and Global Market Attorneys

Founded in 2016 by Cecilio Castillero, SIGMA International and Global Market Attorneys is a boutique transactional law firm that has established itself as the first Panamanian office specializing solely in complex transactions. The firm focuses on high-level legal services in areas such as corporate and project financing, capital markets, mergers and acquisitions, and infrastructure contracts.

SIGMA aims to provide innovative solutions and international quality standards, leveraging its attorneys’ extensive experience in top-tier global firms in New York and Washington D.C. Recognized consistently by Chambers & Partners and Legal 500, the firm harmonizes deep local expertise with a global perspective, ranking among the most prominent offices in Panama for sophisticated financial mandates.

  • Cecilio Castillero (Founding Partner)

    • Specialist in Banking & Finance and Projects & Energy.
    • Former Senior Counsel at Arias, Fábrega & Fábrega, Panama (2010–2016).
    • Former Associate at Milbank, Tweed, Hadley & McCloy LLP, New York (2000–2010).
    • Juris Doctor (Magna Cum Laude), Tulane University; LL.B., Columbus University.
    • Recognized as “No. 1 Banking Lawyer in Panama” by Lexology Client Choice Awards (2026) and Leading Individual by The Legal 500.

    Eric Carles (Associate)

    • Specialist in Project Finance, Capital Markets, and M&A.
    • Former Attorney at DLA Piper LLP, Washington D.C. (2017–2018).
    • Former Lawyer at Arias, Fábrega & Fábrega, Panama (2012–2016).
    • M. in Securities & Financial Regulation, Georgetown University Law Center.
    • Experienced in representing financial institutions in cross-border transactions across Latin America and Africa.
  • Banking & Finance
  • Projects & Energy
  • Mergers and Acquisitions (M&A)
  • Capital Markets
  • Infrastructure & Construction Contracts
  • Joint Ventures