IBA Transparency Notification

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

Louvain-la-Neuve (Belgium), 22 September 2025, 06:00 PM

Summary of the notification

IBA (Ion Beam Applications S.A - EURONEXT - Reuters IBAB - Bloomberg IBAB), the world leader in particle accelerator technology, 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 a notification dated Tuesday 16 September 2025 and received on Thursday 18 September 2025 via email.

In its notification, VALLGESA LIMITED indicated that, following an acquisition of securities incorporating voting rights (i.e. shares) , the 4% voting rights threshold has been crossed upwards on 11 September 2025 by VALLCARA LIMITED , a 100%-controlled undertaking of VALLGESA LIMITED.

Content of the notification received

• Reason for the notification:“Acquisition or disposal of voting securities or voting rights”
• Notification by:“A parent undertaking or a controlling person”
• P e rsons subject to the notification requirement:

• Date on which the threshold is crossed: 11 Sept. 2025
• Threshold crossed (in %) : 4%
• Denominator : 40,516,629
• Notified details: (extract of the received notification form)

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

“VALLCARA LIMITED is 100% held by VALLGESA LIMITED. VALLGESA LIMITED is not a controlled entity.”

• Additional information

“VALLCARA LIMITED has reached the 4% notification threshold due to acquisition of shares. We note that whilst VALLCARA LIMITED is owned 100% by its parent company (VALLGESA LIMITED) all investment decisions are taken independently by the Board and CIO of VALLCARA LIMITED with no influence or control from its parent company.”

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 and Bloomberg More information can be found at:

For further information, please contact:

Elena De Landy
Paralegal: Corporate Affairs and Insurance
...

Attachment

• 21092025-IBA-Vallcara-Ltd-transparency_EN

MENAFN22092025004107003653ID1110094752