[Form 4] Cogent Communications Holdings, Inc. Insider Trading Activity

Rhea-AI Filing Summary

Henry W. Kilmer, Vice President of Network Strategy at Cogent Communications Holdings, Inc. (CCOI), reported a sale of common stock on 09/05/2025. The filing shows 2,400 shares sold at $36.99 per share, reducing his beneficial ownership to 36,200 shares following the transaction. The Form 4 is signed by Mr. Kilmer and filed as an individual report. No derivative transactions or other compensatory arrangements are disclosed in this filing.

Insights

Financial Analyst

TL;DR: Insider sale of 2,400 shares; size appears routine relative to remaining holdings, limited immediate investor impact.

The sale of 2,400 shares at $36.99 reduces Mr. Kilmer's stake to 36,200 shares. The Form 4 does not indicate option exercises, derivative transactions, or a plan-based sale under Rule 10b5-1. Given the disclosed numbers, this transaction is a straightforward disposition by an executive and does not, on its face, signal a material change to company fundamentals.

Corporate Governance Expert

TL;DR: Routine Section 16 filing documenting an executive sale; disclosure meets Form 4 requirements.

The report identifies the reporting person, relationship to the issuer (VP of Network Strategy), transaction date, sale amount, price, and post-transaction ownership, and is manually signed. There is no amendment flag and no indication the sale was pursuant to a trading plan. From a governance and disclosure perspective, the filing appears complete and timely based on the information presented.

SEC Form 4

FORM 4

UNITED STATES SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

STATEMENT OF CHANGES IN BENEFICIAL OWNERSHIP

Filed pursuant to Section 16(a) of the Securities Exchange Act of 1934
or Section 30(h) of the Investment Company Act of 1940

OMB APPROVAL

OMB Number:			3235-0287
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hours per response:			0.5

Check this box if no longer subject to Section 16. Form 4 or Form 5 obligations may continue. See Instruction 1(b).

Check this box to indicate that a transaction was made pursuant to a contract, instruction or written plan for the purchase or sale of equity securities of the issuer that is intended to satisfy the affirmative defense conditions of Rule 10b5-1(c). See Instruction 10.

1. Name and Address of Reporting Person^*

KILMER HENRY W

(Last) (First) (Middle)

2450 N ST NW

4TH FLOOR

(Street)

WASHINGTON DC 20037

(City) (State) (Zip)

2. Issuer Name and Ticker or Trading Symbol
COGENT COMMUNICATIONS HOLDINGS, INC. [ CCOI ]

5. Relationship of Reporting Person(s) to Issuer
(Check all applicable)

	Director		10% Owner
X	Officer (give title below)		Other (specify below)
	VP OF NETWORK STRATEGY

3. Date of Earliest Transaction (Month/Day/Year)
09/05/2025

4. If Amendment, Date of Original Filed (Month/Day/Year)

6. Individual or Joint/Group Filing (Check Applicable Line)

X	Form filed by One Reporting Person
	Form filed by More than One Reporting Person

Table I - Non-Derivative Securities Acquired, Disposed of, or Beneficially Owned
1. Title of Security (Instr. 3)	2. Transaction Date (Month/Day/Year)	2A. Deemed Execution Date, if any (Month/Day/Year)	3. Transaction Code (Instr. 8)		4. Securities Acquired (A) or Disposed Of (D) (Instr. 3, 4 and 5)			5. Amount of Securities Beneficially Owned Following Reported Transaction(s) (Instr. 3 and 4)	6. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	7. Nature of Indirect Beneficial Ownership (Instr. 4)
			Code	V	Amount	(A) or (D)	Price
common stock	09/05/2025		S		2,400	D	$36.99	36,200	D

Table II - Derivative Securities Acquired, Disposed of, or Beneficially Owned (e.g., puts, calls, warrants, options, convertible securities)
1. Title of Derivative Security (Instr. 3)	2. Conversion or Exercise Price of Derivative Security	3. Transaction Date (Month/Day/Year)	3A. Deemed Execution Date, if any (Month/Day/Year)	4. Transaction Code (Instr. 8)		5. Number of Derivative Securities Acquired (A) or Disposed of (D) (Instr. 3, 4 and 5)		6. Date Exercisable and Expiration Date (Month/Day/Year)		7. Title and Amount of Securities Underlying Derivative Security (Instr. 3 and 4)		8. Price of Derivative Security (Instr. 5)	9. Number of derivative Securities Beneficially Owned Following Reported Transaction(s) (Instr. 4)	10. Ownership Form: Direct (D) or Indirect (I) (Instr. 4)	11. Nature of Indirect Beneficial Ownership (Instr. 4)
				Code	V	(A)	(D)	Date Exercisable	Expiration Date	Title	Amount or Number of Shares

Explanation of Responses:

	/s/ Henry Kilmer	09/05/2025
	** Signature of Reporting Person	Date
Reminder: Report on a separate line for each class of securities beneficially owned directly or indirectly.
* If the form is filed by more than one reporting person, see Instruction 4 (b)(v).
** Intentional misstatements or omissions of facts constitute Federal Criminal Violations See 18 U.S.C. 1001 and 15 U.S.C. 78ff(a).
Note: File three copies of this Form, one of which must be manually signed. If space is insufficient, see Instruction 6 for procedure.
Persons who respond to the collection of information contained in this form are not required to respond unless the form displays a currently valid OMB Number.

FAQ

What did Henry W. Kilmer sell in the Form 4 for CCOI?

The Form 4 reports a sale of 2,400 shares of Cogent Communications common stock.

At what price were the CCOI shares sold by the reporting person?

The shares were sold at a price of $36.99 per share on 09/05/2025.

How many CCOI shares does Henry Kilmer own after the reported transaction?

Following the sale, Mr. Kilmer beneficially owns 36,200 shares.

What is Henry Kilmer's role at Cogent Communications as listed on the Form 4?

He is listed as Vice President of Network Strategy and an officer of the issuer.

Does the Form 4 report any derivative transactions or 10b5-1 plan sales for CCOI?

No derivative securities, option exercises, or indication of a Rule 10b5-1 plan are disclosed in this filing.