SEC Form 6-K filed by Polyrizon Ltd.

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 October 2025

Commission file number: 001-42375

Polyrizon Ltd.

(Translation of registrant’s name into English)

5 Ha-Tidhar Street

Raanana, 4366507, Israel

(Address of principal executive offices)

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

Attached hereto and incorporated herein is the Registrant’s press release issued on October 6, 2025, titled “Polyrizon Announces Positive Pre-Clinical Results: PL-14 Demonstrates Encouraging Allergen-Blocking Efficacy.”

The first five paragraphs of the press release attached to this Report of Foreign Private Issuer on Form 6-K as Exhibit 99.1 are incorporated by reference into the Registrant’s Registration Statements on Form S-8 (File No. 333-284410 and 333-288923), 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and Exchange Commission, to be a part thereof from the date on which this report is submitted, to the extent not superseded by documents or reports subsequently filed or furnished.

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.