Exhibit 99.1 SIMILARWEB ANNOUNCES FOURTH QUARTER AND FISCAL YEAR 2023 RESULTS Delivers positive free cash for the first time since IPO Non-GAAP operating profit margin of 8% TEL AVIV, ISRAEL -- February 13, 2024 -- 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 fourth quarter ended December 31, 2023. The Company published a letter to shareholders from management discuss ...