International Society of Primerus Law Firms

Mexico City Attorney
Sergio Mario Ostos

Phone: +52 55 5093 9700


Languages: English, Spanish

Sergio Mario Ostos is a partner at CCN, where he has worked since 1997. His practice includes working with clients on business and financial transactions in Mexico and the United States, international sales of goods and services, strategic alliances and joint ventures, as well as mergers and acquisitions, corporate tax, financial structuring and international business. Sergio Mario Ostos has broad experience representing U.S. clients doing business in Mexico and working with Mexican clients carrying out projects in the United States, as well as non-Mexican investors establishing businesses in Mexico. He has participated in numerous substantial mergers, acquisitions and financings, in particular with the Mexican component of such transactions. Mr. Ostos received his law degree from the Escuela Libre de Derecho in Mexico City and his Master’s of Law (LL.M.) from New York University Law School. As part of his continuing legal education, he has received various diplomas from the International Bar Association and The College of Law in England. He is a member of the American Bar Association, Mexican Bar Association, International Bar Association, and International Fiscal Association.

Licensed in

Mexico (2001)


Spanish and English


  • New York University, New York, New York (Master of Law, LL.M., 2003)
  • Escuela Libre de Derecho, Mexico City, Mexico (J.D., 1999)

Professional Memberships

  • American Bar Association
  • Barra Mexicana de Abogados
  • International Bar Association
  • Inter-American Bar Association
  • International Fiscal Association
  • NYU Law Alumni Association
  • Union Internationale des Avocates
  • United States-Mexico Bar Association


  • Energy Reform – Mexican Constitution – By: Sergio Mario Ostos and Antonio Franck, CCN Mexico Report January 2014 
  • “Salaries Paid to Foreigners Living in the United States and Working in Mexico,” World Trade Executive, Inc. Practical Mexican Tax Strategies, Volume 3, Number 4, Concord, Massachusetts, July/August 2003
  • “Second Protocol Amending the Mexico-U.S. Tax Treaty,” North American Free Trade & Investment Report, World Trade Executive, Inc., August 15, 2003, Volume 13, Number 15, Concord, Massachusetts, 2003
  • “Mexican States and Structured Public Finance: Governmental Investment Certificates Provide Excellent Benefits,” International Securitization & Structured Finance Report, World Trade Executive, Inc., November 30, 2003, Volume 6, No. 21, Concord, Massachusetts, 2003
  • “Independent Personal Services Rendered in Mexico by Individuals Residing Abroad,” Volume 3, Number 6, Concord, Massachusetts. “Mexican Tax Reforms,” Texas Transnational Law Quarterly, International Law Section, The State Bar of Texas, February 2004, Volume 17, No. 4, Austin, Texas, 2004
  • “Structured Public Finance by Mexican States and Municipalities: Governmental Investment Certificates (Certificados Bursátiles Gubernamentales),” Texas Transnational Law Quarterly, International Law Section, The State Bar of Texas, Feb. 2004, V. 17, No. 4, Austin, Texas, 2004
  • “Mexico: Real Property Lease Payments to Foreign Residents,” Practical Latin American Tax Strategies, World Trade Executive, Inc., April 2004, Volume 7, No. 4, Concord, Massachusetts, 2004
  • Current Monthly Contributor to Latin American Legal Developments Report, edited by the Inter-American Law Committee, Section of International Law and Practice, American Bar Association

Contact This Firm

Cacheaux Cavazos & Newton

Avenida Tecamachalco No. 14-502
Colonia Lomas de Chapultepec
Mexico City, Mexico, C.P. 11010

Law Firm Contact: Felipe Chapula

Tel: +52 55 5093 9700

Fax: +52 55 5093 9701



Member Since: 2010

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