COGENT COMMUNICATIONS HOLDINGS, INC. 10-Q

ITEM 5. OTHER INFORMATION During the three months ended September 30, 2023, no director or officer of the Company adopted or terminated a “ Rule 10b5-1 trading arrangement” or “ non-Rule 10b5-1 trading arrangement,” as each term is defined in Item 408 of Regulation S-K. ​ Page 46 of 48 Table of Contents ITEM 6. EXHIBITS . (a) Exhibits Exhibit Number Description 31.1 ​ Certification of Chief Executive Officer (filed herewith) 31.2 ​ Certification of Chief Financial Officer (filed herewith) 32.1 ​ Certification of Chief Executive Officer (furnished herewith) 32.2 ​ Certification of Chief Financial Officer (furnished herewith) 101.1 ​ The following materials from the Company’s Quarterly Report on Form 10-Q for the quarter ended September 30, 2023, formatted in Inline Extensible Business Reporting Language (XBRL), include: (i) the Condensed Consolidated Statements of Comprehensive Income (Loss), (ii) the Condensed Consolidated Balance Sheets, (iii) the Condensed Consolidated Statements of Cash Flows, and (iv) related notes (filed herewith). 104 ​ Cover Page Interactive Data File (the cover page XBRL tags are embedded within the iXBRL document). ​ ​ ​ ​ Page 47 of 48 Table of Contents SIGNATURES Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. ​ Date: November 9, 2023 COGENT COMMUNICATIONS HOLDINGS, INC. ​ ​ ​ By: /s/ David Schaeffer ​ ​ Name: David Schaeffer ​ ​ Title: Chief Executive Officer ​ ​ ​ Date: November 9, 2023 By: /s/ Thaddeus G. Weed ​ ​ Name: Thaddeus G. Weed ​ ​ Title: Chief Financial Officer and Treasurer ​ ​ Page 48 of 48