Henry W. Kilmer - 01 Dec 2025 Form 4 Insider Report for COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI)

Role: VP OF NETWORK STRATEGY
Signature: /s/ Henry Kilmer
Issuer symbol: CCOI
Transactions as of: 01 Dec 2025
Net transactions value: $0
Form type: 4
Filing time: 02 Dec 2025, 16:25:54 UTC
Previous filing: 05 Sep 2025
Next filing: 08 Dec 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
KILMER HENRY W	VP OF NETWORK STRATEGY	2450 N ST NW, 4TH FLOOR, WASHINGTON	/s/ Henry Kilmer	02 Dec 2025	0001599812

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CCOI	common stock	Sale	$0	+2,400	+6.6%	$0.000000	38,600	01 Dec 2025	Direct	F1

* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id	Content
F1	On January 3, 2022, the reporting person was granted an award of restricted stock units, which vest in the form of common stock based upon the Issuer's achievement of certain performance goals. The Issuer's Board of Directors, and its Compensation Committee, determined that the performance goals had been met, resulting in the vesting of these shares on December 1, 2025 under the terms of the grant.

Content

On January 3, 2022, the reporting person was granted an award of restricted stock units, which vest in the form of common stock based upon the Issuer's achievement of certain performance goals. The Issuer's Board of Directors, and its Compensation Committee, determined that the performance goals had been met, resulting in the vesting of these shares on December 1, 2025 under the terms of the grant.