Certain Ordinary Shares of InterXion Holding N.V. are subject to a Lock-Up Agreement Ending on 26-AUG-2019. These Ordinary Shares will be under lockup for 61 days starting from 26-JUN-2019 to 26-AUG-2019. Details: The company officers and directors have agreed that, for a period of 60 days from the date of this prospectus supplement, they will not, without the prior written consent of Citigroup Global Markets Inc., Barclays Capital Inc., BofA Securities, Inc. and Guggenheim Securities, LLC, dispose of or hedge any shares or any securities convertible into or exchangeable for its shares.