Cogent Communications Holdings, Inc.

CCOI·NASDAQ·$19.96Share Price as of 11/2·$1000MMarket Cap as of 11/2

Financials

10-QQ2 ended 06/30/2608/06/26 10-QQ1 ended 03/31/2605/04/26 10-KFY 202502/20/26 10-QQ3 ended 09/30/2511/06/25 10-QQ2 ended 06/30/2508/07/25

Disclosures

8-KCurrent report08/06/26 8-KCurrent report06/29/26 8-KCurrent report06/15/26 8-KCurrent report05/26/26 8-KCurrent report05/04/26

Prospectuses and Registrations

S-8Registration of securities for employees05/04/26 S-8Registration of securities for employees05/08/25 S-8Registration of securities for employees05/12/23 S-8Registration of securities for employees05/03/21 S-8Registration of securities for employees05/01/19

Proxies

DEF 14ADefinitive proxy03/20/26 DEF 14ADefinitive proxy03/26/25 PRE 14APreliminary proxy03/13/25 DEF 14ADefinitive proxy03/25/24 DEF 14ADefinitive proxy03/15/23

Ownership

Form 4Insider transaction09/30/26 Form 4Insider transaction09/30/26 Form 4Insider transaction09/30/26 Form 4Insider transaction09/30/26 Form 4Insider transaction09/30/26

Other

ARSAnnual report to shareholders03/20/26 ARSAnnual report to shareholders03/26/25 ARSAnnual report to shareholders03/25/24 ARSAnnual report to shareholders03/15/23 UPLOADLetter from the SEC05/23/18