Publication relating to transparency notifications

REGULATED INFORMATION

Publication relating to transparency notifications

Mont-Saint-Guibert(Belgium), September 5, 2025, 10:30 pm CET / 4:30 pm ET – In accordance with article 14 of the Act of 2 May 2007 on the disclosure of large shareholdings, Nyxoah SA (Euronext Brussels/Nasdaq: NYXH) announces that it received a transparency notification as detailed below.

On September 4, 2025, Nyxoah received a transparency notification from Cochlear Limited and Cochlear Investments Pty Ltd following a passive crossing of a threshold. Based on the notification, Cochlear Investments Pty Ltd holds 5,631,319 voting rights, representing 14.999% of the total number of voting rights on August 29, 2025 (37,544,782).

The notification dated September 4, 2025 contains the following information:

Reason for thenotification: passive crossing of a threshold Notification by: a parent undertaking or a controlling person Persons subject to the notification requirement:

Cochlear Limited (with address at 1 University Avenue, Macquarie University, NSW 2109, Australia)Cochlear Investments Pty Ltd (with address at 1 University Avenue, Macquarie University, NSW 2109, Australia)Date on which the threshold was crossed: August 29, 2025Threshold that is crossed: 15%Denominator: 37,544,782Notifieddetails:

A) Voting rightsPrevious notificationAfter the transaction # of voting rights# of voting rights% of voting rightsHolders of voting rights Linked to securitiesNot linked to the securitiesLinked to securitiesNot linked to the securitiesCochlear Limited0000.00%0.00%Cochlear Investments Pty Ltd3,947,6175,631,319015.00%0.00%Subtotal3,947,6175,631,319 15.00% TOTAL5,631,319 15.00%0.00%

Full chain of controlled undertakings through which the holding is effectively held: Cochlear Investments Pty Ltd is a wholly owned subsidiary of Cochlear Limited, which is listed on the Australian Securities Exchange and has no controlling shareholder.Additional information: This notification concerns a downward crossing of the 15% threshold following a passive decrease, whereby Cochlear Investments Pty Ltd’s holding in Nyxoah fell from 15.04% to 14.999% of the voting rights.

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Contact:
Nyxoah
John Landry, CFO
[email protected]

Attachment

2025 09 05 PR Transparency notifications 2025 09 (Cochlear) (ENG)