Exhibit 99.1

Information on the total number of voting rights and shares

May 23, 2025

Information on the total number of voting rights and shares

Mont-Saint-Guibert (Belgium), May 23, 2025, 10:30 pm CET / 4:30 pm ET – In accordance with article 15 of the Law of 2 May 2007 on the disclosure of large shareholdings, Nyxoah SA (Euronext Brussels and Nasdaq: NYXH) publishes the below information following the issue of new shares.

·	Share capital: EUR 6,430,026.16
·	Total number of securities carrying voting rights: 37,429,265 (all ordinary shares)
·	Total number of voting rights (= denominator): 37,429,265 (all relating to ordinary shares)
·	Number of rights to subscribe to securities carrying voting rights not yet issued: 2,854,068 (all granted subscription rights; this number excludes 478,057 subscription rights that were issued but not yet granted)

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Contact:

Nyxoah

John Landry, CFO

IR@nyxoah.com

Attachment

· 2025 05 23 - Press release - Number of shares (ENG)