Exhibit 99.1 SIMILARWEB ANNOUNCES THIRD QUARTER 2025 RESULTS Revenue growth of 11% in the third quarter Eighth consecutive quarter of positive free cash flow Customer base increased by 15% TEL AVIV, ISRAEL -- November 11, 2025 -- Similarweb Ltd. (NYSE: SMWB) ("Similarweb" or the "Company"), a leading digital data and analytics company powering critical business decisions, today announced financial results for its third quarter ended September 30, 2025. The Company published a letter to shareholders from man ...