Ion Beam Applications, SA

Major Shareholding Notification • May 7, 2020

IBA – TRANSPARENCY NOTIFICATION

Louvain-la-Neuve, Belgium, May 5, 2020, 17.30

Summary of the notification

IBA (Ion Beam Application), the world's leading provider of proton therapy solutions for the treatment of cancer, announces that it has to issue a transparency notification, in accordance with Article 14, al. 1 of the Transparency Law of May 2, 2007 on disclosure of major holdings, further to the notification received on May 5, 2020.

In its notification, Norges Bank has notified, that following a passive crossing of a threshold, its total holding in IBA has crossed downwards the 4% threshold on April 30, 2020.

In details, on April 30, 2020, Norges Bank owned 1.409.069 IBA shares with voting rights (versus 1.409.069 shares in its previous notification), representing 3.70 % of the total number of shares with voting rights issued by IBA (38.085.047) (versus 4.68% in its previous notification).

Content of the notification

• Reason for the notification: Passive crossing of a threshold
• Persons subject to the notification requirement: Norges Bank
• Date on which the threshold is crossed: 30/04/2020
• Threshold crossed (in %): 4%
• Denominator: 38 085 047

Press release 05/05/2020

• Notified details: (extract of the received notification form)

A) Voting rights	Previous notification	After the transaction
	# of voting rights		# of voting rights	% of voting rights
Holders of voting rights		Linked to securities	Not linked to the securities	Linked to securities	Not linked to the securities
Norges Bank	961.258	1.409.069		3.70%
	TOTAL	1.409.069	0	3.70%	0,00%

B) Equivalent financial instruments	After the transaction
Holder of equivalent financial instruments	Type of financial instrument	Expiration date	Exercise period or date	# of voting rights that may be acquired if the instrument is exercised	% of voting rights	Settlement
	TOTAL			0	0.00%

TOTAL (A & B)		# of voting rights	%of voting rights
		1.409.069	3.70%

• Full chain of controlled undertakings through which the holding is effectively held

Norges Bank is the central bank of Norway. As part of its central bank activities, Norges Bank manages Norway's foreign exchange reserves and is responsible for management of the Norwegian Government Pension Fund Global (GPFG). The formal responsibility for management of the GPFG is placed with the Ministry of Finance, but is delegated to Norges Bank. All investments are executed by Norges Bank acting as principal and all holdings are registered in the name of Norges Bank.

Press release 05/05/2020

For further information, please contact:

IBA

Elodie Jaumain Paralegal +32 10 203 180 legal@iba-group.com

About IBA

IBA (Ion Beam Applications) is a global medical technology company focused on bringing integrated and innovative solutions for the diagnosis and treatment of cancer. The company is the worldwide technology leader in the field of proton therapy, considered to be the most advanced form of radiation therapy available today. IBA's proton therapy solutions are flexible and adaptable, allowing customers to choose from universal full-scale proton therapy centers as well as compact, single room solutions. In addition, IBA also has a radiation dosimetry business and develops particle accelerators for the medical world and industry. Headquartered in Belgium and employing about 1,500 people worldwide, IBA has installed systems across the world.

IBA is listed on the pan-European stock exchange NYSE EURONEXT (IBA: Reuters IBAB.BR and Bloomberg IBAB.BB). More information can be found at: www.iba-worldwide.com

Press release 05/05/2020