UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 6-K

REPORT OF FOREIGN PRIVATE ISSUER

PURSUANT TO RULE 13a-16 OR 15d-16

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of March 2026 (Report No. 4)

Commission File Number: 001-42796

Nasus Pharma Ltd.

P.O. Box 284

Tel Aviv, Israel 6100201

(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 ☒ Form 40-F ☐

CONTENTS

Press Release

On March 25, 2026, Nasus Pharma Ltd. (the “Company”) issued a press release titled “Nasus Pharma Advances NS002 Towards Pivotal Study Following Positive Phase 2; Reports Annual Results and Provides Business Update”, a copy of which is furnished as Exhibit 99.1 to this Report of Foreign Private Issuer on Form 6-K.

EXHIBIT INDEX

SIGNATURE

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.