6-K

UNITEDSTATES

SECURITIESAND EXCHANGE COMMISSION

Washington, D.C. 20549

Form 6-K

REPORT OF FOREIGN PRIVATE ISSUER PURSUANT TORULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For****the month of November 2021

Commission File Number: 001-40552

NYXOAHSA

(Translation of registrant’s name into English)

Rue EdouardBelin 12, 1435 Mont-Saint-Guibert, Belgium

(Address of principal executive office)

Indicate by check mark whether the registrant files or will file annual reports under cover of Form 20-F or Form 40-F.

Form 20-F x          Form 40-F ¨

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(1): ¨

Note: Regulation S-T Rule 101(b)(1) only permits the submission in paper of a Form 6-K if submitted solely to provide an attached annual report to security holders.

Indicate by check mark if the registrant is submitting the Form 6-K in paper as permitted by Regulation S-T Rule 101(b)(7): ¨

Note: Regulation S-T Rule 101(b)(7) only permits the submission in paper of a Form 6-K if submitted to furnish a report or other document that the registrant foreign private issuer must furnish and make public under the laws of the jurisdiction in which the registrant is incorporated, domiciled or legally organized (the registrant’s “home country”), or under the rules of the home country exchange on which the registrant’s securities are traded, as long as the report or other document is not a press release, is not required to be and has not been distributed to the registrant’s security holders, and, if discussing a material event, has already been the subject of a Form 6-K submission or other Commission filing on EDGAR.

Nyxoah SA

On October 29, 2021, Nyxoah SA (the “Company”) issued a press release, a copy of which is attached hereto as Exhibit 99.1.

Theinformation in the attached Exhibit 99.1 is being furnished and shall not be deemed “filed” for the purposesof Section 18 of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), or otherwise subject to the liabilitiesof that Section, nor shall it be deemed incorporated by reference in any filing made by the Company under the Securities Act of 1933,as amended, or the Exchange Act, except as otherwise set forth herein or as shall be expressly set forth by specific reference in sucha filing.

Exhibits

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned, thereunto duly authorized.

Exhibit 99.1

Information on the total number ofvoting rights and shares

October 29, 2021

REGULATED INFORMATION

Information on the totalnumber of voting rights and shares

Mont-Saint-Guibert(Belgium), October 29, 2021, 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 exercise of subscription rights and the issue of new shares.

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For further information, please contact:

Nyxoah

Jeremy Feffer, VP IR and Corporate Communications

jeremy.feffer@nyxoah.com

+1 917 749 1494

Gilmartin Group

Vivian Cervantes

IR@nyxoah.com

Attachment