X0202 SCHEDULE 13G/A 0001493152-26-025027 0001386928 XXXXXXXX LIVE 1 COMMON STOCK, PAR VALUE $0.001 PER SHARE 06/10/2026 0001158324 COGENT COMMUNICATIONS HOLDINGS, INC. 19239V302 2450 N Street N.W., Washington DC 20037 Rule 13d-1(c) Park West Asset Management LLC DE 0.00 2806339.00 0.00 2806339.00 2806339.00 N 5.6 IA See Item 2 for additional information. Park West Investors Master Fund, Limited E9 0.00 2523845.00 0.00 2523845.00 2523845.00 N 5.0 CO See Item 2 for additional information. Peter S. Park X1 0.00 2806339.00 0.00 2806339.00 2806339.00 N 5.6 IN See Item 2 for additional information. COGENT COMMUNICATIONS HOLDINGS, INC. 2450 N Street N.W., Washington, DC, 20037 This report on Schedule 13G (this "Schedule 13G") is being jointly filed by (i) Park West Asset Management LLC, a Delaware limited liability company ("PWAM"), (ii) Park West Investors Master Fund, Limited, a Cayman Islands exempted company ("PWIMF"), and (iii) Peter S. Park ("Mr. Park" and, collectively with PWAM and PWIMF, the "Reporting Persons"). PWAM is the investment manager to PWIMF and Park West Partners International, Limited, a Cayman Islands exempted company ("PWPI" and, together with PWIMF, the "PW Funds"). Mr. Park, through one or more affiliated entities, is the controlling manager of PWAM. As of June 10, 2026, PWIMF held 2,523,845 shares of common Stock, par value $0.001 per share (the "Common Stock") and PWPI held 282,494 shares of Common Stock of Cogent Communications Holdings, Inc. (the "Issuer"). PWAM as investment manager to the PW Funds may be deemed to beneficially own 2,806,339 shares of Common Stock of the Issuer. The foregoing beneficial ownership percentage is based upon 50,077,663 shares of Common Stock, issued and outstanding as of April 30, 2026, based on information reported by the Issuer in its Quarterly Report on Form 10-Q filed with the Securities and Exchange Commission on May 4, 2026. The address for the Reporting Persons is: One Letterman Drive, Building C, Suite C5-900, San Francisco, CA 94129. PWAM is organized under the laws of the State of Delaware. PWIMF is a Cayman Islands exempted company. Mr. Park is a citizen of the United States. Y PWAM and Mr. Park - 2,806,339.00 PWIMF - 2,523,845.00 PWAM and Mr. Park - 5.6% PWIMF - 5.0% 0 PWAM and Mr. Park - 2,806,339.00 PWIMF - 2,523,845.00 0 PWAM and Mr. Park - 2,806,339.00 PWIMF - 2,523,845.00 Y Y Y Y Y N By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11. Exhibit 1- Joint Filing Agreement Park West Asset Management LLC /s/ Melissa Victoria Frayer 06/17/2026 Park West Investors Master Fund, Limited /s/ Melissa Victoria Frayer 06/17/2026 Peter S. Park /s/ Peter S. Park 06/17/2026