Marval O’Farrell Mairal stands out as one of Argentina’s leading corporate and M&A practices, known for steering high-stakes, intricate transactions both locally and across Latin America and international markets. The team handles a broad spectrum of work, from major M&A and joint ventures to corporate restructurings, with particular expertise in banking, private equity, venture capital, real estate, and telecoms-related matters. Pablo Artagaveytia, who oversees the firm’s Brazil practice group, leads the M&A practice alongside Pablo Viñals Blake, who excels in M&A, private equity and venture capital deals. Santiago Carregal, the firm's chairman, has a strong track record in headline corporate transactions. Other key individuals include Diego Krischcautzky, a contact for domestic alnd international clients, including high-net-worth individuals; Hernán Slemenson, who is particularly active advising private equity funds, investors and founders on transactions involving the technology sector; María Laura Bolatti Cristofaro, who handles buy and sell-side mandates and joint ventures; Diego Chighizola, who is skilled in agribusiness, real estate, and energy-related matters; and María Macarena García Mirri, who plays a prominent role in major transactions in the energy, mining, automotive, and insurance sectors. The team is further complemented by a group of up-and-coming associates, notably María Virginia Canzonieri, Lucia Trillo, and Maria Agustina Giordano. Since publiction, the firm has hired Juan Martín Allende as an of counsel in the corporate practice; formerly a partner at Allende & Brea (until 2020), his experience takes in corporate financing as well as M&A, particularly in relation to real estate and the energy sector - effective as of December 2025.
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Phone
+5411 4310 0100
Email
Profile

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Profile

Work Department
Banking & Finance / Corporate M&A / Real Estate.
Position

He is a member of the corporate and finance departments, and co-heads the Firm’s private equity/venture capital and equity capital markets groups. He has participated as legal advisor in a broad range of cross-border transactions including M&A, private equity, venture capital, capital markets and financing transactions.

Career

He joined Marval O'Farrell Mairal in July, 1997 and became a partner in 2005. From June 2000 through May 2005, he managed the firm’s New York office. Prior to joining the New York office of Marval, O'Farrell Mairal, Slemenson was a foreign associate at Cleary, Gottlieb, Steen & Hamilton in New York.

Languages
English & Spanish.
Memberships
He is a member of the American Bar Association - where he acted as council member and Division Chair in the Section of International Law (2005-2007) and co-chair of the 2004 Spring Meeting and the Foreign Legal Consultants Committee-, the Bar Association of the City of Buenos Aires, the Association of the Bar of the City of New York and the New York State Bar Association, where he chaired the Council of Licensed Legal Consultants.
Education

Mr. Slemenson received his law degree from the Universidad de Buenos Aires, Argentina in 1992 and his Master of Laws (LL.M) degree from American University - Washington College of Law in 1996.

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Testimonials

Collated independently by Legal 500 research team.

  • 'They have a commitment and proximity to the client according to their individual needs, and have a lot of experience and participate in the most important transactions in the country.'

  • 'Apart from the solid technical knowledge, they have a sharp commercial sense to give the best advice and interaction to the clients.'

  • 'In M&A, María Laura Bolatti has an unmatched capacity for resolution and pragmatism.'

  • 'The team is a Swiss watch - everything functions with perfection and accuracy. With them, everything is foreseeable and happens as they project.'

  • 'They are absolutely dedicated to making things happen and are at the forefront of using new and interesting tools to deliver the best service.'

  • 'Pablo Artagaveytia is exceptional and thinks outside the box; he works very closely with the clients and involves himself personally in the business.'

Key clients

  • Allianz
  • Total Austral
  • Eternal
  • BYD
  • BHP
  • Marcopolo
  • Golar
  • ENAP
  • Lamb Weston International
  • Banco de Valores

Work highlights

Advising Golar LNG on the first LNG project in Argentina, a $6bn project consisting of a 20-year deployment of a Floating Liquefied Natural Gas vessel in Argentina.
Assisting BHP in its due diligence of the Josemaria and Filo del Sol copper projects in the Province of San Juan and in the implementation of the acquisition of 100% of Filo Corp, valued at $3bn.
Advising Eternal Tsingshan Group Co., Ltd. on the sale of its stake in Eramine Sudamerica S.A.