Executive Management S.A.


Thomas Steimann
Chief Executive Officer

Thomas Steimann joined REGIS-TR SA in 2019 from the Spanish Central Securities Depository Iberclear, where he was external advisor for strategic projects in the area of domestic and cross-border post-trade securities services.

Between 1998 and 2017, Thomas was at Deutsche Bank SAE in Madrid, initially with responsibility for non-resident institutional clients’ securities clearing & custody activity in the Spanish market, and from 2006 to 2017 as head of securities clearing & custody and depository bank services for all institutional clients. His responsibilities in this role included P&L for the business unit, control and supervision of operational service delivery and representation of the business to market participants, supervisory authorities and industry groups.

Thomas began his professional career at Westdeutsche Landsbank’s Düsseldorf headquarters, later taking responsibility for the Controlling department for Treasury and Foreign Exchange at West LB (Europa) AG in Madrid. He has a degree in Business Administration from the University of Cologne and is fluent in German, Spanish and English.


Irene Mermigidis
Managing Director

Before joining REGIS-TR as joint Managing Director, Irene was the Managing Director of Link Up Markets, the joint venture set up by ten Central Securities Depositories to enable interoperability, improve efficiency and reduce the post-trade processing costs of cross-border securities transactions. She has been a Board Member of ALMUS, the association of SWIFT members and users in Luxembourg, and an active participant in industry forums on market standards and infrastructures, business re-engineering and pricing.

Earlier in her career, Irene held a number of roles in finance and lending operations at the European Investment Bank and Schlumberger Limited. She has a degree in Economic and Political Science from the Catholic University of Mons and an MBA from Solvay Business School in Belgium.


David Retana
Managing Director

Joint Managing Director David Retana joined REGIS-TR in 2011 as Head of the Project Office. Previously, he spent nine years as head of Market Surveillance at MEFF, the Spanish Derivatives Exchange, after first joining the BME Group in 2000 as a futures and options trader on the MEFF front desk.

David holds a degree in Finance from San Pablo CEU University in Spain, and a Master of Quality Audit from Comillas Pontifical University (ICADE), also in Spain.