Borja Martínez | Fieldfisher
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Professional background

Professional background

Since 2002, I have been advising companies in the field of antitrust law. I regularly support clients in interpreting and addressing practical issues related to competition rules, as well as in implementing tailored antitrust compliance programmes.

I have advised companies during antitrust inspections and in European, national and regional administrative proceedings concerning restrictive agreements — including cartels — abuses of dominant position, and matters related to mergers and investment control. I also have significant experience advising on State aid (including the Foreign Subsidies Regulation) and internal market law.

In addition, I have represented clients before the Spanish civil courts in competition-related cases, both in damages claims and unfair competition matters.

I am a regular contributor to universities and higher education institutions and the author of numerous publications on competition law in specialised media. I also serve as Secretary and member of the Board of Directors of the Spanish Association for the Defence of Competition (Asociación Española de Defensa de la Competencia).

Authored pieces

All Resources
Public & Regulatory
Insight

“No poach" agreements in sport: why CD Tondela could be a turning point

22.04.2026
At the end of this month, the Court of Justice of the European Union (CJEU) is expected to deliver its judgment in Case C‑133/24, CD Tondela and Others v Autoridade da Concorrência .
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A close-up of an LED screen displays a financial graph with a cityscape in the background. The screen shows a series of dots forming line patterns, representing data. The scene is illuminated with blue and pink lights, giving it a futuristic feel.
Corporate
Insight

Click at your own risk: Antitrust pitfalls of online sales bans

24.11.2025
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Close-up image of several credit cards laid out flat, with focus on the raised numbers of one card in the foreground. The image is illuminated with a mix of purple and blue light, giving it a modern and tech-savvy appearance.
Public & Regulatory
Insight

BBVA-Sabadell merger collapses after unprecedented government approval

11.11.2025
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Insight

Foreign Direct Investment (FDI) Regimes in the UK and Europe – risks and opportunities 2023/2024

27.09.2023
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Insight

Fieldfisher contributes to Chambers Alternative Energy & Power 2023 Global Practice Guide

22.08.2023
This year's guide features contributions from Fieldfisher's German, Irish, Dutch and Spanish energy experts.
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