Our professionals

Our professionals


Thais Arza Monteiro

Thais Arza Monteiro
55 11 3147 2873 thais.monteiro@mattosfilho.com.br São Paulo – Paulista

Areas of expertise


Thais has significant experience in pre-litigation and in handling complex insurance law, life sciences and intellectual property cases before Brazilian courts. She represents insurers and reinsurers in both lawsuits and arbitrations in relation to claims involving large risks insurance, public administration, reimbursement and judicial reorganization disputes.


With a particular focus on intellectual property litigation, Thais also represents local and foreign clients in lawsuits involving the infringement of trademarks, patents, software, unfair competition and data breaches.


Bachelor of Laws, Universidade Presbiteriana Mackenzie

Master’s Degree in Procedural Law, Université Paris Sud


Benchmark Litigation (2019-2021)

Euromoney – Expert Guides – Rising Stars (2021)

Único. The Mattos Filho news portal

Authored publications

Mattos Filho in the media

With Thais Arza Monteiro
Latin Lawyer

Major firms make a stand in ferocious battle for Avianca Brasil

Some of Brazil’s most prestigious firms have been enlisted in a fierce legal battle for Avianca Brasil as its restructuring proceedings – marked by judicial deadlock, thousands of grounded flights and growing debt – gained renewed momentum on Monday.

The airliner came to the edge of bankruptcy when its restructuring plan was suspended following an injunction last month, but an appeals court gave the green light for the deal yesterday. The plan divides the airliner into seven different entities that will be auctioned off on 10 July. Click here and learn more

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