6-K

UNITED STATES

SECURITIES AND EXCHANGECOMMISSION

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 July 2026 (Report No. 4)

Commission File Number: 001-40303

Qtrex Quantum Ltd.

(Translation of registrant’s name into English)

2 Ilan Ramon St.

Ness-Ziona 7403635, Israel

(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 July 6, 2026, the Board of Directors of Qtrex Quantum Ltd. (the “Company”) approved an increase in the number of ordinary shares, no par value per share, of the Company reserved for issuance under the Company’s Amended and Restated 2019 Equity Incentive Plan by 3,834,244 from 11,875,977 to 15,710,221.

This Report of Foreign Private Issuer on Form 6-K is incorporated by reference into the Company’s Registration Statements on Form F-3 (Registration Nos. 333-284308, 333-289324 and 333-296482) and Form S-8 (Registration Nos. 333-259057, 333-277980, 333-285565, 333-290162 and 333-292592), filed with the Securities and Exchange Commission, to be a part thereof from the date on which this Report is submitted, to the extent not superseded by documents or reports subsequently filed or furnished.

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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.

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