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
A finger is pushing the first of several aligned wooden domino blocks on a dark surface, causing a chain reaction. The dominoes are all in different stages of falling, illustrating the domino effect concept. The background is a gradient of blue and purple shades.
Public and Regulatory
Insight

Haircare brand fined for resale price maintenance

20.07.2026
On 12 January 2026, the CNMC imposed a fine of approximately €1.2 million on I.C.O.N., a distributor of professional haircare and cosmetic products, for resale price maintenance (RPM) over a period exceeding a decade.
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Abstract digital landscape of interconnected points forming a wireframe mesh. The scene transitions from purple at the bottom to blue at the top, giving a sense of depth and complexity against a dark background. The structure resembles a wave or terrain.
Public and Regulatory
Insight

RPM voids the entire franchise agreement and defeats all post-contractual penalties

16.07.2026
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Public and Regulatory
Insight

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

22.04.2026
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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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Public and Regulatory
Insight

BBVA-Sabadell merger collapses after unprecedented government approval

11.11.2025
The BBVA–Sabadell merger ultimately fails after a conditioned and rare “third-phase” clearance by the Council of Ministers, marking a shift towards public interest–driven merger control.
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