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 January 2026 (Report No. 2)

Commission File Number: 001-39957

NEWCELX LTD.

(Translation of registrant’s name into English)

The Circle 6

8058 Zurich, Switzerland

(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

On January 12, 2026, NewcelX Ltd., a corporation incorporated under the laws of Switzerland, issued a press release titled: “NewcelX Announce Positive Results from International Collaborative Study Exploring Advanced Biomaterial Approaches for Stem Cell–Derived Islet Delivery in Type 1 Diabetes Without Immune Suppression.” A copy of this press release is furnished herewith as Exhibit 99.1.

EXHIBIT INDEX

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.