The Firm

Independent firm committed to excellence and with growing international presence


4|5|3 Law Firm was founded in Barcelona in March, 2000 and has grown significantly every since, by recruiting, developing and retaining the best people. We strongly believe our people are the key of our success. Our lawyers take great pride in their fundamental legal skills and all are expected to be exemplary professionals with consummate experience in their particular discipline. Thus, we make sure the quality of client service offered by our firm is 100% guaranteed.

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Our mission +-

Building strong, substantial and lasting client relationships has always been and remains one of our main objectives, together with offering a comprehensive legal service to address our clients’ business needs at all times.

It is our in-depth understanding of clients’ businesses and needs that enables us to deliver the quality of advice and service they expect. We believe this is the only way to be effective in solving their legal and business challenges. And, of course, by keeping close to our clients we can proactively identify better ways to help them achieve their ambitions.

About our business +-

Our work is divided into three broad divisions: Corporate Law and M&A contracts (including IP and Information Technology Law), Tax planning and Labor legal advice.

In addition, we offer clients extensive litigation experience in trial, appellate and arbitration matters. Main practice areas include general and commercial litigation, white collar criminal defense, international commercial arbitration and dispute resolution.


Our values +-

Legal services based on the principles of teamwork, collaboration, and commitment to client service, along with the professional ethics standards governing our profession, have led us – for the past 20 years – to earn the trust of national and international companies, public organisations and institutions.

Recognition +-

Among other international recognitions, 4|5|3 Law Firm has been recommended by The Legal 500, an independent research organization that publishes guides to the world’s “pre-eminent” law firms, in the following categories: “Corporate and M&A” and “Dispute Resolution”.

In addition, Best Lawyers ® lists several 4|5|3 lawyers in different specialist areas every year. Among them, Mariano Roca has been awarded “Lawyer of the Year” for his Tax practice in several years.