Ryan Castillo

Capital Markets, Corporate & Securities, Canada


Frederick Ryan Castillo is a partner in Mayer Brown’s New York office and a member of the Capital Markets practice. His work focuses on securities and corporate finance transactions. Ryan advises issuers, investment banks and sponsors in connection with public offerings and private placements of debt, equity and hybrid securities, including initial public offerings, follow-on offerings, investment grade and high-yield debt offerings, private investment in public equity, tender and exchange offers, consent solicitations, medium-term note programs and other capital markets transactions in the United States, Canada and the Euro markets. He represents companies and financial intermediaries involved in a broad range of industries, including financial services, technology, telecommunications, retail, life sciences, real estate and energy. He also advises clients on corporate governance, securities law compliance and general corporate matters.


  • Ateneo de Manila University, JD, with honors
    Captain of the World Champion team in the 45th Philip C. Jessup International Law Moot Court Competition
  • Harvard Law School, LLM
    Editor, Harvard Business Law Review


  • ニューヨーク州弁護士
  • Philippines