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The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request"}],"balance_after":3930481,"source":{"system":"sec-edgar","filing":"0001976408-26-000866","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1910424/000197640826000866/primary_doc.xml","form_type":"4"}},{"id":4626641,"issuer":{"id":5145,"kind":"organization","name":"SIMILARWEB LTD.","symbol":"SMWB"},"owners":[{"id":18964,"kind":"person","name":"Offer Or","position":1,"cik":"0001910424","reported_name":"Offer Or","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Ordinary Shares","published_at":"2026-09-25T11:46:55.000Z","date":"2026-09-24","kind":"sale","planned":true,"acquired":false,"shares":113900,"price":7.6888,"value":875754.32,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1st, 2026"},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from  $7.33 to $8.305. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request"}],"balance_after":3930881,"source":{"system":"sec-edgar","filing":"0001976408-26-000866","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1910424/000197640826000866/primary_doc.xml","form_type":"4"}},{"id":4626618,"issuer":{"id":5145,"kind":"organization","name":"SIMILARWEB LTD.","symbol":"SMWB"},"owners":[{"id":18964,"kind":"person","name":"Offer Or","position":1,"cik":"0001910424","reported_name":"Offer Or","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Ordinary Shares","published_at":"2026-09-24T11:56:38.000Z","date":"2026-09-23","kind":"sale","planned":true,"acquired":false,"shares":28400,"price":8.5353,"value":242402.52,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1st, 2026"},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from  $8.37 to $8.61. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request"}],"balance_after":4044781,"source":{"system":"sec-edgar","filing":"0001976408-26-000863","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1842731/000197640826000863/primary_doc.xml","form_type":"4"}},{"id":4626617,"issuer":{"id":5145,"kind":"organization","name":"SIMILARWEB LTD.","symbol":"SMWB"},"owners":[{"id":18964,"kind":"person","name":"Offer Or","position":1,"cik":"0001910424","reported_name":"Offer Or","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Ordinary Shares","published_at":"2026-09-24T11:56:38.000Z","date":"2026-09-22","kind":"sale","planned":true,"acquired":false,"shares":34500,"price":8.3778,"value":289034.1,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1st, 2026"},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from  $8.22 to $8.50. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request"}],"balance_after":4073181,"source":{"system":"sec-edgar","filing":"0001976408-26-000863","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1842731/000197640826000863/primary_doc.xml","form_type":"4"}},{"id":4624382,"issuer":{"id":5145,"kind":"organization","name":"SIMILARWEB LTD.","symbol":"SMWB"},"owners":[{"id":18964,"kind":"person","name":"Offer Or","position":1,"cik":"0001910424","reported_name":"Offer Or","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Ordinary Shares","published_at":"2026-09-22T11:43:14.000Z","date":"2026-09-21","kind":"sale","planned":true,"acquired":false,"shares":32200,"price":8.404,"value":270608.8,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1st, 2026"},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from  $8.29 to $8.48. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request"}],"balance_after":4107681,"source":{"system":"sec-edgar","filing":"0001976408-26-000859","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1910424/000197640826000859/primary_doc.xml","form_type":"4"}},{"id":4624381,"issuer":{"id":5145,"kind":"organization","name":"SIMILARWEB LTD.","symbol":"SMWB"},"owners":[{"id":18964,"kind":"person","name":"Offer Or","position":1,"cik":"0001910424","reported_name":"Offer Or","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Ordinary Shares","published_at":"2026-09-22T11:43:14.000Z","date":"2026-09-18","kind":"sale","planned":true,"acquired":false,"shares":37500,"price":8.2476,"value":309285.0,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1st, 2026"},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from  $8.10 to $8.345. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request"}],"balance_after":4139881,"source":{"system":"sec-edgar","filing":"0001976408-26-000859","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1910424/000197640826000859/primary_doc.xml","form_type":"4"}},{"id":4622566,"issuer":{"id":5145,"kind":"organization","name":"SIMILARWEB LTD.","symbol":"SMWB"},"owners":[{"id":18964,"kind":"person","name":"Offer Or","position":1,"cik":"0001910424","reported_name":"Offer Or","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Ordinary Shares","published_at":"2026-09-18T10:13:59.000Z","date":"2026-09-17","kind":"sale","planned":true,"acquired":false,"shares":30400,"price":8.346,"value":253718.4,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1st, 2026"},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from  $8.19 to $8.50. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request"}],"balance_after":4177381,"source":{"system":"sec-edgar","filing":"0001976408-26-000856","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1910424/000197640826000856/primary_doc.xml","form_type":"4"}},{"id":4622565,"issuer":{"id":5145,"kind":"organization","name":"SIMILARWEB LTD.","symbol":"SMWB"},"owners":[{"id":18964,"kind":"person","name":"Offer Or","position":1,"cik":"0001910424","reported_name":"Offer Or","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Ordinary Shares","published_at":"2026-09-18T10:13:59.000Z","date":"2026-09-16","kind":"sale","planned":true,"acquired":false,"shares":45719,"price":8.3976,"value":383929.8744,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1st, 2026"},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from  $8.235 to $8.76. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request"}],"balance_after":4207781,"source":{"system":"sec-edgar","filing":"0001976408-26-000856","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1910424/000197640826000856/primary_doc.xml","form_type":"4"}},{"id":4618939,"issuer":{"id":5145,"kind":"organization","name":"SIMILARWEB LTD.","symbol":"SMWB"},"owners":[{"id":18964,"kind":"person","name":"Offer Or","position":1,"cik":"0001910424","reported_name":"Offer Or","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Ordinary Shares","published_at":"2026-09-16T13:07:57.000Z","date":"2026-09-15","kind":"sale","planned":true,"acquired":false,"shares":26691,"price":8.5267,"value":227586.1497,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1st, 2026"},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from  $8.32 to $8.70. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request"}],"balance_after":4253500,"source":{"system":"sec-edgar","filing":"0001976408-26-000852","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1910424/000197640826000852/primary_doc.xml","form_type":"4/A","original_submission_date":"2026-09-16"}},{"id":4618938,"issuer":{"id":5145,"kind":"organization","name":"SIMILARWEB LTD.","symbol":"SMWB"},"owners":[{"id":18964,"kind":"person","name":"Offer Or","position":1,"cik":"0001910424","reported_name":"Offer Or","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Ordinary Shares","published_at":"2026-09-16T13:07:57.000Z","date":"2026-09-14","kind":"sale","planned":true,"acquired":false,"shares":52900,"price":8.5378,"value":451649.62,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1st, 2026"},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from  $8.07 to $8.70. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request"}],"balance_after":4280191,"source":{"system":"sec-edgar","filing":"0001976408-26-000852","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1910424/000197640826000852/primary_doc.xml","form_type":"4/A","original_submission_date":"2026-09-16"}},{"id":4618905,"issuer":{"id":5145,"kind":"organization","name":"SIMILARWEB LTD.","symbol":"SMWB"},"owners":[{"id":18964,"kind":"person","name":"Offer Or","position":1,"cik":"0001910424","reported_name":"Offer Or","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Ordinary Shares","published_at":"2026-09-16T11:01:18.000Z","date":"2026-09-15","kind":"sale","planned":true,"acquired":false,"shares":26691,"price":8.5267,"value":227586.1497,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1st, 2026"},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from  $8.32 to $8.70. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request"}],"balance_after":4253500,"source":{"system":"sec-edgar","filing":"0001976408-26-000850","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1910424/000197640826000850/primary_doc.xml","form_type":"4"}},{"id":4618904,"issuer":{"id":5145,"kind":"organization","name":"SIMILARWEB LTD.","symbol":"SMWB"},"owners":[{"id":18964,"kind":"person","name":"Offer Or","position":1,"cik":"0001910424","reported_name":"Offer Or","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Ordinary Shares","published_at":"2026-09-16T11:01:18.000Z","date":"2026-09-14","kind":"sale","planned":true,"acquired":false,"shares":52900,"price":8.5378,"value":451649.62,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1st, 2026"},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from  $8.07 to $8.70. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request"}],"balance_after":4280191,"source":{"system":"sec-edgar","filing":"0001976408-26-000850","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1910424/000197640826000850/primary_doc.xml","form_type":"4"}},{"id":4618903,"issuer":{"id":5145,"kind":"organization","name":"SIMILARWEB LTD.","symbol":"SMWB"},"owners":[{"id":18964,"kind":"person","name":"Offer Or","position":1,"cik":"0001910424","reported_name":"Offer Or","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Ordinary Shares","published_at":"2026-09-16T10:55:13.000Z","date":"2026-09-15","kind":"sale","planned":true,"acquired":false,"shares":26691,"price":8.5267,"value":227586.1497,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1st, 2026"},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from  $8.32 to $8.70. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request"}],"balance_after":4253500,"source":{"system":"sec-edgar","filing":"0001976408-26-000849","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1910424/000197640826000849/primary_doc.xml","form_type":"4"}},{"id":4618902,"issuer":{"id":5145,"kind":"organization","name":"SIMILARWEB LTD.","symbol":"SMWB"},"owners":[{"id":18964,"kind":"person","name":"Offer Or","position":1,"cik":"0001910424","reported_name":"Offer Or","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Ordinary Shares","published_at":"2026-09-16T10:55:13.000Z","date":"2026-09-14","kind":"sale","planned":true,"acquired":false,"shares":52900,"price":8.5378,"value":451649.62,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1st, 2026"},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from  $8.07 to $8.70. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request"}],"balance_after":4280191,"source":{"system":"sec-edgar","filing":"0001976408-26-000849","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1910424/000197640826000849/primary_doc.xml","form_type":"4"}},{"id":4616609,"issuer":{"id":5145,"kind":"organization","name":"SIMILARWEB LTD.","symbol":"SMWB"},"owners":[{"id":18964,"kind":"person","name":"Offer Or","position":1,"cik":"0001910424","reported_name":"Offer Or","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Ordinary Shares","published_at":"2026-09-14T13:07:55.000Z","date":"2026-09-11","kind":"sale","planned":true,"acquired":false,"shares":59000,"price":8.0493,"value":474908.7,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1st, 2026"},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from  $7.94 to $8.12. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request"}],"balance_after":4333091,"source":{"system":"sec-edgar","filing":"0001976408-26-000837","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1910424/000197640826000837/primary_doc.xml","form_type":"4"}},{"id":4616608,"issuer":{"id":5145,"kind":"organization","name":"SIMILARWEB LTD.","symbol":"SMWB"},"owners":[{"id":18964,"kind":"person","name":"Offer Or","position":1,"cik":"0001910424","reported_name":"Offer Or","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Ordinary Shares","published_at":"2026-09-14T13:07:55.000Z","date":"2026-09-10","kind":"sale","planned":true,"acquired":false,"shares":59200,"price":8.0631,"value":477335.52,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1st, 2026"},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from  $7.89 to $8.18. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request"}],"balance_after":4392091,"source":{"system":"sec-edgar","filing":"0001976408-26-000837","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1910424/000197640826000837/primary_doc.xml","form_type":"4"}},{"id":4614395,"issuer":{"id":5145,"kind":"organization","name":"SIMILARWEB LTD.","symbol":"SMWB"},"owners":[{"id":18964,"kind":"person","name":"Offer Or","position":1,"cik":"0001910424","reported_name":"Offer Or","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Ordinary shares","published_at":"2026-09-10T13:28:27.000Z","date":"2026-09-09","kind":"sale","planned":true,"acquired":false,"shares":86300,"price":8.0568,"value":695301.84,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1st, 2026"},{"field":"price","element":"transactionPricePerShare","label":"F3","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from  $8.00 to $8.22. The reporting person undertakes to provide full information regarding the number of shares sold at each separate price upon request"}],"balance_after":4451291,"source":{"system":"sec-edgar","filing":"0001976408-26-000832","document":"primary_doc.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1910424/000197640826000832/primary_doc.xml","form_type":"4"}},{"id":4614394,"issuer":{"id":5145,"kind":"organization","name":"SIMILARWEB LTD.","symbol":"SMWB"},"owners":[{"id":18964,"kind":"person","name":"Offer Or","position":1,"cik":"0001910424","reported_name":"Offer Or","relationship":{"director":false,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"Chief Executive Officer"}}],"security":"Ordinary shares","published_at":"2026-09-10T13:28:27.000Z","date":"2026-09-08","kind":"sale","planned":true,"acquired":false,"shares":60700,"price":8.3295,"value":505600.65,"ownership":{"direct":true},"footnotes":[{"field":"kind","element":"transactionCoding","label":"F1","text":"The sale reported on this Form 4 were effectuated pursuant to a Rule 10b5-1 trading plan adopted by the Reporting Person on June 1st, 2026"},{"field":"price","element":"transactionPricePerShare","label":"F2","text":"The price reported is a weighted average price. These shares were sold in multiple transactions ranging from  $8.24 to $8.56. 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