Join SIX at Sibos 2025

CEO SIX

Bjørn Sibbern has been the CEO of SIX since January 2025. Previously, since joining SIX in January 2024, he led the stock exchange business as Global Head Exchanges and a Member of the Executive Board. Bjørn Sibbern has experience managing large teams in the fields of trading, funds, post-trade, listings, IPOs, data, index business, and technology. Before joining SIX, he served as Executive Vice President and President of European Markets at Nasdaq. In this role, he led the Nasdaq markets and exchanges across the Nordic and Baltic regions. He was also responsible for trading, listing, clearing, settlement, and the data business in Sweden, Denmark, Finland, Iceland, and the Baltic nations. Prior to this, Bjørn was Executive Vice President and responsible for Nasdaq global data, data & analytics and index business working out of Nasdaq headquarter in New York. Before joining Nasdaq, Bjørn Sibbern was CEO at E*TRADE Bank Denmark from 2006 to 2008 and held key roles at OMX and Stocknet Norway. The Danish citizen holds an Executive Master in Business Administration, a Graduate Diploma in Finance, and a Master in Business Administration and Commercial Law from Copenhagen Business School.

Other Activities and Mandates

• Chairman, Bolsas y Mercados Españoles SA (BME), Madrid
• Chairman or Board Member of various SIX Group Ltd companies
• Chairman Working Committee, World Federation of Exchanges WFE, London

Head Securities Services

Rafael Moral Santiago has been Head Securities Services and a member of the Executive Board of SIX since June 2025. Before joining SIX, he held different leadership positions at HSBC in Hong Kong and London from 2015 until 2024. In his most recent role, he served as Global Head of Country Management Securities Services for HSBC, leading the regional strategy and coordination of the bank’s securities services business across more than thirty markets.

Prior positions included Head of Securities Services for Europe, as well as for Asia Pacific & MENA. From 2002 until 2015 Rafael Moral Santiago worked at Deutsche Bank in various management roles in Germany, the USA and Singapore, most recently as Global Head of Investor Services responsible for Custody, Clearing, Fund Services, and Securities Lending.

Before joining Deutsche Bank, he gained business leadership experience as the CFO and executive board member at 100world (now Senacor Technologies), following a position as strategy consultant at McKinsey & Co. A Spanish citizen, Rafael Moral Santiago graduated from the HHL Leipzig Graduate School of Management and attended INSEAD’s MBA and International Executive Programmes.

Head Financial Information

Marion Leslie joined SIX Group in January 2020 as Head Financial Information and a member of the SIX Executive Board. As Head Financial Information, Marion Leslie leads the SIX global data business, serving financial institutions worldwide with critical data and insights to support their clients. She is also the representative on the Executive Board for Sustainability.

Leading global businesses and operations at scale, with a strong emphasis on data and technology, are the hallmarks of her career in financial services. Prior to joining SIX, Marion Leslie was Managing Director, Enterprise at Refinitiv (London Stock Exchange) with responsibility for delivering market data, platforms and services to the global financial markets. Before that, she held a variety of executive roles within London Stock Exchange Group, having joined Reuters in 1994. Marion Leslie holds a Post Graduate Certificate in Education in French and German from the University of Cambridge. She was named one of the 100 Most Influential Women in European Finance by Financial News every year from 2020-2024, was listed as one of Swiss Finance’s Women to Watch in 2022, and was included in the World Federation of Exchanges Women Leaders List 2021. 

Other Activities and Mandates

• President or Board Member of various SIX Group Ltd companies
• Board Member, Bolsas y Mercados Españoles SA (BME), Madrid
• Board Member, Swiss Sustainable Finance, Zurich
• Board Member, Advance, Zurich
• Chair, UK Hydrographic Office, Taunton

Head Banking Services

Dieter Goerdten has headed the Banking Services business unit since December 2022. He previously had been in charge of the Banking Services business unit’s Products & Solutions department since September 2018. He earned a degree in economics from the University of Hamburg, holds a Master of Advanced Studies degree in corporate finance from the University of Applied Sciences and Arts of Northwestern Switzerland, and has many years of international managerial experience in the Swiss financial sector. His professional background also includes career experience in the airline industry (at Deutsche Lufthansa in Frankfurt, Cologne, and Hamburg) and in the field of international development cooperation (at the German Development Cooperation Agency), with multiyear stints in Costa Rica and Ethiopia. In Switzerland he has held various management roles at UBS, PostFinance, the St. Gallen-based Bankenberatungszentrum, and the consultancy firm Boxcon. Dieter Goerdten served also as the interim Chief Executive Officer of Swiss Euro Clearing Bank in Frankfurt.

Other Activities and Mandates

• Chairman or Board Member of various SIX Group Ltd companies
• Chairman, Terravis Ltd, Zurich
• Chairman, SECB GmbH, Frankfurt