In the worst case, severe cyberattacks may pose a threat to financial sector stability. One of Danmarks Nationalbank’s main objectives is to contribute to the stability of the financial system. Therefore, Danmarks Nationalbank have conducted a questionnaire survey of the cyber resilience of the core financial sector participants in Denmark in 2016 (published 2017) and in 2018. It comprises the major banks and mortgage banks as well as key financial infrastructure companies in FSOR.