At midnight from Friday to Saturday, the United Kingdom officially ceased to belong to the EU. There are 11 months of negotiations ahead to define future relations between the country and the community bloc. Although the options of a hard Brexit disappeared in the final stretch of 2019 once British Prime Minister Boris Johnson ratified the exit agreement, uncertainties will continue to be planned. This instability will be felt in the stock exchanges and especially in those listed with exposure to the United Kingdom. However, in the last three and a half years Spanish companies have done their homework to shield their business from possible shocks and apply the necessary contingency plans.