Publication relating to transparency notifications

REGULATED INFORMATION

Publication relating to transparency notifications

Mont-Saint-Guibert(Belgium), March 20, 2026, 10:30 pm CET / 5:30 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.

Robert Taub / Robelga SRL

On March 19, 2026, Nyxoah received a transparency notification from Robert Taub and related person Robelga SRL, following the crossing above the 3% threshold by Robelga SRL on December 30, 2025 (while the overall “group” participation did not change). Based on the notification, Robert Taub (together with his controlled undertakings) held 4,360,800 voting rights, consisting of 4,310,800 voting rights linked to securities and 50,000 equivalent financial instruments, representing 10.14% of the total number of voting rights on December 30, 2025 (43,026,460).

The notification dated March 19, 2026 contains the following information:

Reason for thenotification: acquisition or disposal of voting securities or voting rightsNotification by: a parent undertaking or a controlling person Persons subject to the notification requirement:

Robert TaubRobelga SRL (with address at Avenue des Croix de Guerre 149 / 13, 1120 Brussels)Date on which the threshold was crossed: December 30, 2025Threshold that is crossed: 3%Denominator: 43,026,460Notifieddetails:

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 securitiesRobert Taub2,712,5102,712,51006.30%0.00%BMI Estate567,484000.00%0.00%Robelga SRL1,030,8061,598,29003.71%0.00%Subtotal4,310,8004,310,800 10.02% TOTAL4,310,80010.02%0.00%

B) Equivalent financial instrumentsAfter the transactionHolders of equivalent financial instrumentsType of financial instrumentExpiration dateExercise period or date# of voting rights that may be acquired if the instrument is exercised% of voting rightsSettlementRobert TaubWarrants08/06/2027 25,0000.06%cashRobert TaubWarrants14/06/2028 25,0000.06%cash TOTAL 50,0000.12%

TOTAL (A & B)# of voting rights% of voting rights 4,360,80010.14%

Full chain of controlled undertakings through which the holding is effectively held: Robelga SRL is 100% owned by BMI Estate (a partnership (société simple) without legal personality). Robert Taub has 100% usufruct and Robert Taub’s children have 100% bare ownership of BMI Estate.Additional information: This notification was due because Robelga SRL moved above the 3% threshold.

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Contact:
Nyxoah
John Landry, CFO
[email protected]

Attachment

2026 03 20 PR Transparency notification (Robert Taub) (ENG)