DAVE SCHAEFFER - 31 Dec 2025 Form 4 Insider Report for COGENT COMMUNICATIONS HOLDINGS, INC. (CCOI)

Role: CHAIRMAN, CEO, AND PRESIDENT, Director
Signature: /s/ David Schaeffer
Issuer symbol: CCOI
Transactions as of: 31 Dec 2025
Net transactions value: $0
Form type: 4
Filing time: 05 Jan 2026, 16:44:10 UTC
Previous filing: 11 Aug 2025
SEC: View on sec.gov

Reporting Owners (1)

Name	Relationship	Address	Signature	Signature date	CIK
SCHAEFFER DAVE	CHAIRMAN, CEO, AND PRESIDENT, Director	2450 N ST NW, 4TH FLOOR, WASHINGTON	/s/ David Schaeffer	05 Jan 2026	0001166976

Transactions Table

Type	Sym	Class	Transaction	Value $	Shares	Change %	* Price $	Shares After	Date	Ownership	Footnotes
transaction	CCOI	common stock	Award	$0	+229,657	+33%	$0.000000	926,800	31 Dec 2025	Direct	F1
transaction	CCOI	common stock	Gift	$0	-229,657	-25%	$0.000000	697,143	31 Dec 2025	Direct	F2
transaction	CCOI	common stock	Gift	$0	+229,657		$0.000000	229,657	31 Dec 2025	by family trust	F2

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

Explanation of Responses:

Id	Content
F1	The award of restricted stock shall vest effective January 1, 2029, based on Mr. Schaeffer's continued employment as Chief Executive Officer of the Company through December 31, 2028.
F2	These shares were transferred to a family trust for no consideration.