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The correct number of shares beneficially owned following the transactions on January 14, 2025, are reflected herein."}],"balance_after":4504038,"source":{"system":"sec-edgar","filing":"0001415889-25-001492","document":"form4-01152025_090127.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":2,"url":"https://www.sec.gov/Archives/edgar/data/1158324/000141588925001492/form4-01152025_090127.xml","form_type":"4"}},{"id":1302811,"issuer":{"id":1298,"kind":"organization","name":"COGENT COMMUNICATIONS HOLDINGS, INC.","symbol":"CCOI"},"owners":[{"id":50038,"kind":"person","name":"SCHAEFFER DAVE","position":1,"cik":"0001166976","reported_name":"SCHAEFFER DAVE","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHAIRMAN, CEO, AND PRESIDENT"}}],"security":"common stock","published_at":"2025-01-15T21:32:31.000Z","date":"2025-01-14","kind":"grant","planned":false,"acquired":true,"shares":84000,"price":0,"value":0.0,"ownership":{"direct":true},"footnotes":[{"field":"shares","element":"transactionShares","label":"F1","text":"These shares of restricted stock will vest in twelve equal monthly installments starting on January 1, 2028."},{"field":"balance_after","element":"sharesOwnedFollowingTransaction","label":"F2","text":"The Form 4 filed by the reporting person on March 8, 2024 (and subsequent filings through December 17, 2024), understated the reporting person's beneficial ownership by 96,000 shares.   The correct number of shares beneficially owned following the transactions on January 14, 2025, are reflected herein."}],"balance_after":4408038,"source":{"system":"sec-edgar","filing":"0001415889-25-001492","document":"form4-01152025_090127.xml","document_sequence":1,"table":"nonDerivative","row_type":"transaction","position":1,"url":"https://www.sec.gov/Archives/edgar/data/1158324/000141588925001492/form4-01152025_090127.xml","form_type":"4"}},{"id":1329386,"issuer":{"id":1298,"kind":"organization","name":"COGENT COMMUNICATIONS HOLDINGS, INC.","symbol":"CCOI"},"owners":[{"id":50038,"kind":"person","name":"SCHAEFFER DAVE","position":1,"cik":"0001166976","reported_name":"SCHAEFFER DAVE","relationship":{"director":true,"officer":true,"ten_percent_owner":false,"other":false,"officer_title":"CHAIRMAN, CEO, AND PRESIDENT"}}],"security":"common 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