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COGENT COMMUNICATIONS HOLDINGS, INC.

For the period ended Sep 30, 2025. Filed Nov 6, 2025.

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A company's report for each of its first three quarters. The financial statements are not audited. It shows how the business has moved since the last annual report, and what management says changed.

Sep 30, 2025 · Filed Nov 6, 2025

CCOI$4.45+11.8%Stored close · as of Nov 9, 2026

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Item 6. Exhibits

(a)Exhibits
Exhibit NumberDescription
4.1​Indenture, dated as of June 17, 2025, among Cogent Communications Group, LLC, Cogent Finance, Inc., the guarantors named therein and Wilmington Trust, National Association, as trustee and collateral agent (previously filed as Exhibit 4.1 to our Current Report on Form 8-K, filed on June 17, 2025 and incorporated herein by reference).
4.2​Form of 6.500% Senior Secured Note due 2032 (included as Exhibit A to Exhibit 4.1 hereto).
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, 2025, formatted in Inline Extensible Business Reporting Language (XBRL), include: (i) the Condensed Consolidated Statements of Comprehensive 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).
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