LAWYER PROFILE

Marius Juonys

Europe 2026

Ellex Valiunas

Ranked in 1 practice area

Competition/Antitrust

Lithuania

20 years ranked

About

Provided by Ellex Valiunas

Europe

Practice Areas

Marius Juonys is a partner and head of Competition practice group, who solely dedicated to competition-related matters, with 20 years of experience in this area. He and his team were involved probably in all major competition cases over the past 10 – 15 years. On a number of occasions, he was also invited by public authorities as a competition expert in various working groups entrusted with the task of preparing legislative proposals. Unsurprisingly, Marius Juonys is recognized as one of the most experienced practitioners while he and his colleagues are the only team of practitioners in Lithuania for many years ranked as tier No. 1 by all major legal directories (Chambers Europe, Legal 500 EMEA ). Meanwhile specialized edition „Global Competition Review“ ranks the Ellex competition team as the sole „Elite“ practice in Lithuania for many consecutive years.

Along with practicing competition law, Marius Juonys teaches competition law at Vilnius University.

Professional Memberships

Marius Juonys is a member of Lithuanian Bar Association.

He is a member of Competition Law Committee of the Lithuanian Bar Council.

He is also a member of Committee on Corporate Affairs and Law and Committee on Economic and Business Environment of the Lithuanian Confederation of Industrialists.

Chambers Review

Provided by Chambers

Chambers European Guide

Competition/Antitrust - Lithuania

Band 1

Individual Editorial

Marius Juonys is highly regarded for his broad competition law practice that covers both transactional and contentious competition law work. He assists clients with merger control filings, as well as advising on challenges to merger prohibition decisions. He has notable experience in investigations into alleged abuses of dominance or cartels and in appeals against fines.

Learn more about this team View ranking table

Strengths

Provided by Chambers

He is the best expert in the competition area.
Competition/AntitrustChambers European Guide
His knowledge of what we are doing is key because we can align our views on risks. He knows how our business is conducted and gets us results.
Competition/AntitrustChambers European Guide
He is regarded as one of the most experienced competition lawyers in the market with a large portfolio of successful cases.
Competition/AntitrustChambers European Guide
Marius Juonys is very good at proactively bringing up things that we hadn't thought of, and providing solutions that drive our business forwards.
Competition/AntitrustChambers European Guide
His ability to quickly grasp complex legal issues and translate them into actionable advice is impressive. He’s pragmatic, thoughtful and solution-oriented.
Competition/AntitrustChambers European Guide