Santander Securities Services S.A.U. (S3), a banking subsidiary of Banco Santander, S.A., provides custody and settlement services, and acts as a depositary and administrator either directly or indirectly - via its own subsidiaries - for institutional and corporate customers in Europe (Spain, Portugal and Poland) and Latin America (Mexico, Brazil, Colombia, Argentina and Chile)*.S3's main business activity is the provision of post-trade securities services. It is a reginal supplier in Latin America and the leader of the Spanish market.S3 has successfully adapted to the growing complexity of markets and regulatory changes, and has invested heavily in technology and media to improve its services, thereby enabling it to expand its customers and volume of assets in custody on a constant basis.As of May 2018, S3 has assets worth more than EUR 915,000 million in custody and more than 290 employees, with an average of 10 years'​ experience and specialized in post-trade securities services.* Santander Securities Services reaches markets in Argentina, Chile, Poland and Portugal via Santander Group companies.