X0607 3 2026-04-13 0 0001842731 SIMILARWEB LTD. SMWB 0002116981 Alliance Joshua true 19 ACACIA ROAD LONDON X0 NW86AN 1 0 0 0 Ordinary Shares 8883950 D 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. Joshua Alliance by: Oppenheimer Israel, as Attorney-in-fact 2026-04-13