Tanoira Cassagne Abogados has a growing labour and employment practice that focuses on both individual and collective labour law, with particular strength in complex labour disputes, union negotiations, stock option plans, and restructuring procedures. The team also handles the labour aspects of M&A, drafts and counsels on international employment contracts, and advises national and multinational companies operating in Argentina on broader employment matters. Practice head Pablo Mastromarino specialises in individual and collective labour matters, including disputes, expatriate programmes, compensation structures, union negotiations, and investigations. Associates María Carolina Muriago, who joined from Beccar Varela in June 2024, Ezequiel Peña, and Mora López Petit provide support across a range of labour and employment matters. Since publiation, Muriago has been raised to the partnership and will co-lead he practice alongside Mastromarino - effective as of March 2026.
Legal 500 Editorial commentary
Accolades
Client satisfaction: Lawyer & team quality
Client satisfaction: Billing & efficiency
Client satisfaction: Sector knowledge
Testimonials
Collated independently by Legal 500 research team.
- 'I would like to give special mention to Pablo Mastromarino, who is always available and demonstrates a genuine dedication to service. His approach is practical, clear, and committed, and it is clear that he seeks not only to resolve a legal problem, but also to generate value with his intervention.'
- 'The added value that sets the lawyers at this firm apart is their approachability, availability, and focus on concrete solutions. They stand out from other firms because of their ability to listen to the client, truly understand the need behind each consultation, and provide useful and applicable answers, all at a reasonable price.'
- 'The labour team is dynamic and close to the client, demonstrating excellent technical knowledge.'
- 'What stands out most about this firm is its ability to confidently take on a complex portfolio from day one. The transition process was surprisingly smooth, which speaks not only to their professionalism but also to their preparation and commitment. They have demonstrated great willingness, with an always proactive attitude and a constant concern for understanding the client's needs. It is clear that they work with seriousness, approachability, and practicality, which inspires a great deal of confidence on a day-to-day basis.'
- 'Pablo Mastromarino has extensive experience of almost 30 years advising companies on labour law. He stands out for his excellent handling of highly complex issues and his vast experience in corporate labour matters such as expatriates, international employment contracts, compensation mechanisms for senior management, union negotiations, staff restructuring, etc. María Carolina Muriago is an excellent lawyer with very solid knowledge. She stands out for her excellent handling of highly complex labour lawsuits with significant economic impact and her experience in matters such as senior management compensation, expatriates, and restructuring, among others.'
- 'Pablo Mastromarino is an excellent and highly recommended lawyer.'
Key clients
- Adidas
- Ericsson
- Dow
- Aerolíneas Argentinas
- Philips
- Simplot
- Compañía General de Combustibles
- Kimberly Clark
- Remax
- Bridgestone
- Bayer
- BlackToro Global Investments
Lawyers
Leading partners
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Practice head
Pablo Mastromarino; María Carolina Muriago
Other key lawyers
Ezequiel Peña; Mora López Petit