Competition/Antitrust
Brazil
15 years ranked
LAWYER PROFILE
Ademir Antonio Pereira Júnior
Brazil 2026
Ranked in 1 practice area
About
Provided by Del Chiaro Pereira Advogados
Brazil: Contentious
Practice Areas
Competition/Antitrust
Internet regulation
Telecommunications
Payments
Career
Ademir Pereira is a co-head of the antitrust/competition practice at Del Chiaro Pereira. With over 15 years of antitrust/competition practice, his experience comprises the entire range of antitrust issues - merger review, cartel investigations and several landmark unilateral conduct cases. Ademir is regular antitrust counsel to major international companies such as Google, ArcelorMittal, Mondelez, Ericsson, Kimberly-Clark, Gilead Sciences, Lundbeck, Volkswagen.
He has represented clients in the most relevant cases in the digital economy and matters that shaped the interface between IP and Antitrust. In addition, Ademir has extensive experience with cases in industries like pharmaceutical, financial/payments, consumer products, steel, infrastructure and automotive. He is currently advising clients in various cases in Brazil and across LATAM jurisdictions.
For the past 12 years, Ademir has been consistently nominated as one of Brazil´s top antitrust attorneys by Chambers Latin America (Band 2), Legal 500 (“next generation partner”), Analise 500 (“most admired” in antitrust, technology, automotive, logistics, mining and steel) and Who’s Who Legal (“Though Leader – Global Elite”). In 2023 and 2025, he won the Legal500 Awards as “Lawyer of the Year – Competition/Antitrust”. In 2021, he was shortlisted for the Global Competition Review Awards as “Lawyer of the Year (under 40)”. From 2020-2024, Ademir featured in the prestigious list “40 Under 40”, published by Global Competition Review to honor the 40 best competition lawyers in the word under 40 years of age. Ademir has published several papers in Brazilian and international legal publications and has co-authored books on competition law, IP and antitrust, internet regulation and financial regulation.
Professional Memberships
Chair of the Competition Commission of Brazil's Corporate Law Institute (IBRADEMP)
Member of the Competition Commission of the Brazilian Bar Association
Council of IBRAC (Brazili Institute of Competition and Consumer Relations)
Personal
PhD, Master Degree (LLM), and Bachelor of Laws Degree (LLB) from the University of São Paulo
Master Degree (LLM), with High Honors in Law, Science and Technology, from Stanford University
Chambers Review
Provided by Chambers
Chambers Brazil: Contentious
Competition/Antitrust - Brazil
Band 2
Individual Editorial
Ademir Antonio Pereira Júnior has a solid reputation in the market for his performance in several competition matters, being particularly active in investigation mandates before CADE.
Strengths
Provided by Chambers
Ademir Antonio Pereira Júnior is exceptionally studious and detail‑oriented. He is someone I admire deeply. He us truly one of the most intelligent people I know.
Competition/AntitrustChambers Brazil: ContentiousAdemir Antonio Pereira Júnior is a detail‑oriented and strategic lawyer, combining strong technical rigour with the ability to craft sophisticated legal strategies. He remains consistently calm and provides clear guidance on next steps, which gives us great confidence when navigating complex, high stakes matters for our company.
Competition/AntitrustChambers Brazil: ContentiousI have worked with Ademir for years. His judgement is extremely sound and he has an excellent feel for a jurisdiction that is still evolving. He produces very high quality technical work, and his legal submissions are thorough and well‑researched. His judgement is consistently very solid.
Competition/AntitrustChambers Brazil: Contentious
Ranked Individuals at Del Chiaro Pereira Advogados (3)
Brazil
José Del Chiaro Ferreira da Rosa
Competition/Antitrust
View profile Ademir Antonio Pereira Júnior
Competition/Antitrust
View profile 
Luiz Felipe Rosa Ramos
Competition/Antitrust
View profile
What success is built on
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