6-K - SIMILARWEB LTD. (0001842731) (Filer)

FORM 6-K

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UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

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REPORT OF FOREIGN ISSUER

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

UNDER THE SECURITIES EXCHANGE ACT OF 1934

For the month of October 2026

Commission File Number: 001-40394

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Similarweb Ltd.

(Translation of registrant’s name into English)

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33 Yitzhak Rabin Rd.,

Givatayim 5348303, Israel

(Address of principal executive offices)

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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): [ ]

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): [ ]

EXPLANATORY NOTE

A Special General Meeting of Shareholders (the “Meeting”) of Similarweb Ltd. (the “Company”), will be held on November 16, 2026, at 4:00 p.m. (Israel time), at the Company’s headquarters at 33 Yitzhak Rabin St., Givatayim, 5348303, Israel. The Company will distribute a Notice of Special General Meeting of Shareholders, Proxy Statement, and a Proxy Card to all shareholders of record as of the close of business on October 8, 2026. In connection with the Meeting, the Company hereby furnishes the following documents:

(i) Notice of Special General Meeting of Shareholders and Proxy Statement with respect to the Company’s Meeting, describing a proposal to be voted upon at the Meeting, the procedure for voting in person or by proxy at the Meeting, and various other details related to the Meeting; and

(ii) Proxy Card whereby holders of ordinary shares of the Company may vote at the Meeting without attending in person.

The Notice of Special General Meeting of Shareholders and Proxy Statement is attached to this Report on Form 6-K as Exhibit 99.1 and the Proxy Card is attached to this Report on Form 6-K as Exhibit 99.2.

Exhibit 99.1 to this Report on Form 6-K is hereby incorporated by reference into the Company's Registration Statements on Form S-8 (Registration Nos. 333-256324, 333-264307, 333-270793, 333-277449, 333-285314 and 333-293912).

EXHIBIT INDEX

SIGNATURES

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