NOTIFICATION TO BONDHOLDERS

Galapagos Holding S.A.
Galapagos S.A.

7.000% Senior Notes due 2022
ISIN Code: XS1071420027
Senior Secured Floating Rate Notes due 2021
ISIN Code: XS1071411547
5.375% Senior Secured Fixed Rate Notes due 2021
ISIN Code: XS1071419524

We are pleased to invite you to the Investor Conference Call of Galapagos Holding S.A.

Tuesday, May 15th, 2018
5.30 p.m. CET (German Time), 4.30 p.m. GMT (British Time),
11.30 a.m. EST (Eastern Standard Time)

Galapagos Holding S.A. will present Financial Information of Galapagos Group for the fourth quarter and twelve months ended December 31st, 2017. The respective Financial Statements will be uploaded to the investor websites on April 30th, 2018.

The conference call will be hosted by Ms. Andrea Teutenberg, Chief Financial Officer of Kelvion Group.

Participants must register in advance of the conference using the link provided below. Upon registering, each participant will be provided with Participant Dial-In Numbers, Direct Event Passcode and unique Registrant ID.

Call reminders will also be sent to registered participants via email the day prior to the event.

In the 10 minutes prior to call start time, Participants will need to use the conference access information provided in the email received at the point of registering.

Note: Due to regional restrictions some participants may receive Operator assistance when joining this conference call and will not be automatically connected.

Online Registration: https://engage.vevent.com/rt/hx_group/index.jsp?seid=85

Lines will be open approximately 5 to 10 minutes before the start of the conference call. The conference call is scheduled to last approximately one hour and will be held in English.

After the management's presentation you will have the opportunity to ask questions concerning the financial information as of December 31st, 2017.

If you have any questions regarding the conference call, please contact:

Nicolas Zörner
Nicolas.Zoerner@kelvion.com
Kelvion Holding GmbH
Meesmannstrasse 103
44807 Bochum, Germany
Tel.: +49 234 980 1563

Antonis Tzanetis
Tzanetis@triton-partners.com
Galapagos S.A.
2C, rue Albert Borschette
1246 Luxembourg, Grand Duchy of Luxembourg
Tel.: +352 26 753 111