IBA – TRANSPARENCY NOTIFICATION

(Article 14, paragraph 1 of the law of 2 May 2007 on the disclosure of major holdings)Louvain-la-Neuve, Belgium, November 12 th, 2025 06:00 PM Summary of the notificationIBA SA (Ion Beam Applications SA), 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...

Louvain-la-neuve, 12/11/2025 (informazione.news - comunicati stampa - salute e benessere)

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

Louvain-la-Neuve, Belgium, November 12^th, 2025 06:00 PM

Summary of the notification

IBA SA (Ion Beam Applications SA), 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 November 7^th, 2025.

In its notification, IBA SA indicated that following an acquisition or disposal of securities or voting rights, the 2% threshold was crossed upwards by the company itself on May 30, 2025.

Content of the notification

Reason for the notification: Acquisition or disposal of voting securities or voting rights
Notification by: A parent company or controlling person
Persons subject to the notification requirement:

Name	Address (for legal entities)
Ion Beam Applications SA	Chemin du cyclotron 3, 1348 Ottignies-Louvain-la-Neuve
IBA Investments SRL	Chemin du cyclotron 3, 1348 Ottignies-Louvain-la-Neuve

Date on which the threshold is crossed: 30/05/2025
Threshold crossed (in %) : 2%
Denominator : 40.514.366
Notified details: (extract of the received notification form)

A) Voting rights	Previousnotification	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
Ion Beam Applications SA	380,002	1,028,752		2.54 %	0.00%
IBA Investments SRL	103,946	103,946		0.26%	0.00%
Subtotal	483,948	1,132,698		2.80%
TOTAL		1,132,698	0	2.80%

B)Equivalentfinancialinstruments	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

TOTAL				0	0.00%

TOTAL (A & B)	# of voting rights	% of voting rights
	1,123,698	2.80%

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

IBA Investments SRL is a subsidiary of Ion Beam Applications SA, which holds 100% of its shares. Ion Beam Applications SA is not a controlled entity.

Additional information

This notification results from the share buyback carried out by Ion Beam Applications SA, which led to the upward crossing of the 2% statutory threshold set out in the company’s articles of association.

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 fields of proton therapy, considered as the most advanced form of radiation therapy available today, as well as industrial sterilization, radiopharmaceuticals and dosimetry. The company, based in Louvain-la-Neuve, Belgium, employs approximately 2,100 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:

Elena De Landy
Paralegal: Corporate Affairs and Insurance
legal@iba-group.com

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