X0607 3 2026-03-26 0 0001842731 SIMILARWEB LTD. SMWB 0001968313 Rapaport-Dagim Tamar false 631 MARYVILLE CENTRE DRIVE SUITE 200 SAINT LOUIS MO 63141 1 0 0 0 Restricted Share Units, each representing one Ordinary Share 23584 D The Reporting Person was granted restricted stock units ("RSUs"), which each represent a contingent right to receive one ordinary share of Similarweb Ltd (the "Company"). The RSUs vest in 2 years period equal installments with the first vesting date on 08/28/2026 subject to the Reporting Person's continued service to the Company or its subsidiaries through each vesting date. This Form 3 has been filed after March 18,2026 but prior to April 20,2026 in reliance on the temporary relief made available to the directors and officers of certain foreign private issuers by the Staff of the Securities and Exchange Commission in its no action letter dated March 13,2026. Tamar Rapaport Dagim by: Oppenheimer Israel, as Attorney-in-fact 2026-03-26