{"filing":{"accession_number":"0001842731-26-000045","cik":"0001842731","ticker":"SMWB","company_name":"SIMILARWEB LTD.","form":"6-K","filing_date":"2026-09-24","report_date":"2026-09-24","primary_document":"a6-kxcoverxprojectm.htm","primary_document_url":"https://www.sec.gov/Archives/edgar/data/1842731/000184273126000045/a6-kxcoverxprojectm.htm"},"events":[{"id":34857,"run_id":32095,"accession_number":"0001842731-26-000045","anchor_item_number":"EX-99.1","event_type":"exec_appointment","event_domain":"governance","is_material":true,"confidence":0.95,"summary":"The exhibit announces the Board's appointment of Michael Akkerman as Chief Executive Officer, effective November 2, 2026, succeeding founder Or Offer. This is a material executive appointment at the C-suite level. While Or Offer's departure is also disclosed, the principal action disclosed is Akkerman's appointment to the CEO role, making exec_appointment the appropriate classification. The appointment of a new CEO with extensive C-level experience at major technology and data companies is material to investors assessing leadership continuity and strategic direction.","company_name":"SIMILARWEB LTD.","ticker":"SMWB","filing_date":"2026-09-24","form":"6-K","submitted_at":null,"items":[{"id":38711,"accession_number":"0001842731-26-000045","item_number":"EX-99.1","item_title":"a6-kxexhibit991xprojectm.htm","event_type":"exec_appointment","event_domain":"governance","is_material":true,"confidence":0.95,"reasoning":"The exhibit announces the Board's appointment of Michael Akkerman as Chief Executive Officer, effective November 2, 2026, succeeding founder Or Offer. This is a material executive appointment at the C-suite level. While Or Offer's departure is also disclosed, the principal action disclosed is Akkerman's appointment to the CEO role, making exec_appointment the appropriate classification. The appointment of a new CEO with extensive C-level experience at major technology and data companies is material to investors assessing leadership continuity and strategic direction.","classifier_version":"claude-haiku-4-5-20251001+prompt-6be895f9","taxonomy_version":"v1.3","classified_at":"2026-09-24T20:03:08.579124+00:00","company_name":"","ticker":null,"filing_date":""}]}],"classifications":[{"id":38711,"accession_number":"0001842731-26-000045","item_number":"EX-99.1","item_title":"a6-kxexhibit991xprojectm.htm","event_type":"exec_appointment","event_domain":"governance","is_material":true,"confidence":0.95,"reasoning":"The exhibit announces the Board's appointment of Michael Akkerman as Chief Executive Officer, effective November 2, 2026, succeeding founder Or Offer. This is a material executive appointment at the C-suite level. While Or Offer's departure is also disclosed, the principal action disclosed is Akkerman's appointment to the CEO role, making exec_appointment the appropriate classification. The appointment of a new CEO with extensive C-level experience at major technology and data companies is material to investors assessing leadership continuity and strategic direction.","classifier_version":"claude-haiku-4-5-20251001+prompt-6be895f9","taxonomy_version":"v1.3","classified_at":"2026-09-24T20:03:08.579124+00:00","company_name":"SIMILARWEB LTD.","ticker":"SMWB","filing_date":"2026-09-24"}]}