Cuatrecasas advises across the full spectrum of corporate and M&A matters, with particular focus on private equity and the energy sector. The practice is co-led by Oscar Trelles, who is noted for his deal structuring capabilities and ability to navigate multi-jurisdictional transactions; and Diego Carrión, whose strong capital markets expertise supports M&A deals involving publicly listed companies. The names to note at senior associate level are Guido Maeda, who is recognised for his work on corporate reorganisations and infrastructure projects; and Mariano Peró, who supports on private equity and general corporate matters. Kiomi Osorio left the firm in April 2026.
Legal 500 Editorial commentary
Accolades
Client satisfaction: Lawyer & team quality
Testimonials
Collated independently by Legal 500 research team.
- I believe Oscar Trelles is one of the best lawyers in M&A; he knows the market, the competition, has experience, and applies it correctly, fostering a friendly atmosphere despite differences in position.
- Cuatrecasas has a great strength in M&A negotiations, allowing us to mount a strong defence of our interests. It's important for the client to be present to help resolve any deadlocks.
Key clients
- Acciona Energía
- Minsur
Work highlights
Advised Acciona Energía on negotiating, executing and closing the sale of its entire shareholding in Energía Renovable del Sur.
Lawyers
Leading partners
The strongest partners in their field, leading on market-leading deals and endorsed by peers and clients alike.
Practice head
Oscar Trelles: Diego Carrión
Other key lawyers
Guido Maeda; Mariano Peró