Exhibit 99.1 SIMILARWEB ANNOUNCES FIRST QUARTER 2023 RESULTS First quarter 2023 revenue grew 19% year-over-year to $52.8 million Non-GAAP operating margin improved by 31 percentage points TEL AVIV, ISRAEL -- May 9, 2023 -- 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 first quarter ended March 31, 2023. The Company published a letter to shareholders from management dis ...