Firm Profile

Header Image for 453 Law Firm , S.A.P.
453 Law Firm , S.A.P.


Av. Diagonal, 453 bis, 4ª pl.
Barcelona 08036
34 93 238 88 88

Firm Details

4|5|3 Law Firm (formerly named "Marco Legal") is a global law firm founded in Barcelona in 2000, now based both in Barcelona and Madrid.

Ever since, the firm has grown steadily, trusted by international companies, public organizations, and institutions.

The firm is comprised of former big firm attorneys and lawyers with experience in the legal department of international corporations, who are committed to client service and excellent work.

Identifying our clients' real needs and offering the best solution for every single case in a constructive and cost-effective manner are our main objectives. We take a proactive approach to solving our client's legal issues.

Our work is divided into four broad divisions:

⇨ Corporate Law, M&A and Commercial contracts (including IP and Information Technology Law),

⇨ Tax planning; 

⇨ Labor legal advice; and

⇨ 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 lawyers take great pride in their fundamental legal skills and all are expected to be exemplary professionals with consummate experience in their particular discipline. In addition, constant updating and fine-tuning of their legal knowledge is something we take very seriously.

Thus, we make sure the quality of client service offered by our firm to both local and international clients is 100% guaranteed.We strongly believe our people are the key to our success.

4|5|3 Law Firm (under Marco Legal name) is 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"

4|5|3 Law Firm is a member of Alliuris A.S.B.L. ( and Consilium Iuris

Firm Practice Areas

  • Criminal Defense
  • Economist
  • Family Law
  • Franchise Law
  • Intellectual Property Law
  • Investment
  • Labor and Employment Law
  • Litigation
  • Privacy & Data Protection Law
  • Real Estate Law
  • Tax Law

Office Locations



Barcelona, Spain

Av. Diagonal, 453 bis, 4ª pl.

Barcelona 08036


34 93 238 88 88

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Madrid, Spain

Moreto 10, Bajo Izq.

Madrid 28014


34 91 564 46 00

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