Guillermina Ester

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Practice Areas

Guillermina Ester focuses her practice on civil, commercial and corporate litigation and arbitration involving unfair competition, shareholder disputes and directors’ liability, contractual disputes, construction disputes, banking litigation and civil liability. Experience advising international and start-up companies who value her thoroughness and hands-on approach.


Joined Pérez-Llorca in 2005 and made partner in 2010. 5 years’ experience at previous firm. Law degree (Universidad Carlos III, Madrid, 1999). General Management Programme (PDG) (IESE Business School, 2018). Languages: Spanish and English

Professional Memberships

Madrid Bar Association, Spanish Arbitration Club (CEA)