Ion Beam Applications, SA

Declaration of Voting Results & Voting Rights Announcements • Dec 21, 2023

IBA – TRANSPARENCY NOTIFICATION

(Article 14, paragraph 1 of the law of 2 May 2007 on the disclosure of major holdings)

Louvain-la-Neuve, Belgium, December 21, 2023 18:00

Summary of the notification

IBA (Ion Beam Applications), 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 December 19th 2023.

In its notification, NORGES BANK indicated that following an acquisition or disposal of securities or voting rights, its total shareholding in IBA SA had increased and its shareholding in IBA shares with voting rights had crossed the threshold of 2% on 15/12/2023.

Content of the notification

• Reason for the notification: Acquisition or disposal of securities or voting rights
• Notification by: A person notifying alone
• Persons subject to the notification requirement:

Name	Address (for legal entities)
Norges Bank	Bankplassen 2, P.O. Box 1179 Sentrum, 0107 Oslo, Norway

• Date on which the threshold is crossed: 15/12/2023
• Threshold crossed (in %) : 2%
• Denominator : 40.595.290
• 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	736,129	710,520		1.75%
TOTAL		710,520	0	1.75%	0.00%

Press release | 21//12/ 2023

IBA | Ion Beam Applications SA Chemin du Cyclotron, 3 | 1348 Louvain-la-Neuve | Belgium | RPM Brabant-wallon VAT : 0428.750.985 | T +32 10 47 58 11 | F +32 10 47 58 10 info@iba-group.com | iba-worldwide.com

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B) Equivalent financial instruments	After the transaction
Holders 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
Norges Bank	Shares on loan (right to recall)		At any time	99,356	0.24%	physical	+
TOTAL			99,356	0.24%
The totals will be updated once you have clicked on 3
	TOTAL (A & B)			# of voting rights	% of voting rights
			CALCULATE	809,876	1.99%

• Additional information

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

About IBA

IBA (Ion Beam Applications S.A.) is the world leader in particle accelerator technology. The company is the leading supplier of equipment and services in the field of proton therapy, considered to be the most advanced form of radiation therapy available today. IBA is also a leading player in the fields of industrial sterilization, radiopharmaceuticals and dosimetry. The company, based in Louvain-la-Neuve, Belgium, employs approximately 2.000 people worldwide. IBA is a certified B Corporation (B Corp) meeting the highest standards of verified social and environmental performance.

IBA is listed on the pan-European stock exchange EURONEXT (IBA: Reuters IBAB.BR and Bloomberg IBAB.BB).

More information can be found at: www.iba-worldwide.com

For further information, please contact:

Valérie Van Impe Paralegal +32479267809 legal@iba-group.com

Press release | 21//12/ 2023

IBA | Ion Beam Applications SA Chemin du Cyclotron, 3 | 1348 Louvain-la-Neuve | Belgium | RPM Brabant-wallon VAT : 0428.750.985 | T +32 10 47 58 11 | F +32 10 47 58 10 info@iba-group.com | iba-worldwide.com