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 the notification: acquisition or disposal of voting securities or voting rights
Notification by: a parent undertaking or a controlling person
Persons subject to the notification requirement:
- Robert Taub
- Robelga SRL (with address at Avenue des Croix de Guerre 149 / 13, 1120 Brussels)
Date on which the threshold was crossed: December 30, 2025
Threshold that is crossed: 3%
Denominator: 43,026,460
Notified details:

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
Robert Taub	2,712,510	2,712,510	0	6.30%	0.00%
BMI Estate	567,484	0	0	0.00%	0.00%
Robelga SRL	1,030,806	1,598,290	0	3.71%	0.00%
Subtotal	4,310,800	4,310,800		10.02%
	TOTAL	4,310,800	0	10.02%	0.00%

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
Robert Taub	Warrants	08/06/2027		25,000	0.06%	cash
Robert Taub	Warrants	14/06/2028		25,000	0.06%	cash
	TOTAL			50,000	0.12%

	TOTAL (A & B)			# of voting rights	% of voting rights
				4,360,800	10.14%

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

IR@nyxoah.com

Attachment

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