UNITED STATES
SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 8-K

CURRENT REPORT
Pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

Date of Report (Date of Earliest Event Reported): August 11, 2025

Cogent Communications Holdings, Inc.

(Exact name of registrant as specified in its charter)

Delaware		000-51829		46-5706863
(State or other jurisdiction of incorporation)		(Commission File Number)		(I.R.S. Employer Identification No.)

2450 N St. NW, Washington, DC		20037
(Address of principal executive offices)		(Zip Code)

Registrant’s telephone number, including area code: 202-295-4200

Not Applicable

(Former name or former address, if changed since last report)

Check the appropriate box below if the Form 8-K filing is intended to simultaneously satisfy the filing obligation of the registrant under any of the following provisions:

¨ Written communications pursuant to Rule 425 under the Securities Act (17 CFR 230.425)

¨ Soliciting material pursuant to Rule 14a-12 under the Exchange Act (17 CFR 240.14a-12)

¨ Pre-commencement communications pursuant to Rule 14d-2(b) under the Exchange Act (17 CFR 240.14d-2(b))

¨ Pre-commencement communications pursuant to Rule 13e-4(c) under the Exchange Act (17 CFR 240.13e-4(c))

Securities registered pursuant to Section 12(b) of the Act:

Title of Each Class	Trading Symbol	Name of Each Exchange on which Registered
Common Stock, par value $0.001 per share	CCOI	NASDAQ Global Select Market

Indicate by check mark whether the registrant is an emerging growth company as defined in Rule 405 of the Securities Act of 1933 (§230.405 of this chapter) or Rule 12b-2 of the Securities Exchange Act of 1934 (§240.12b-2 of this chapter).

Emerging growth company ¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Item 5.02 Departure of Directors or Certain Officers; Election of Directors; Appointment of Certain Officers; Compensatory Arrangements of Certain Officers.

On August 11, 2025, Cogent Communications Holdings, Inc. (the “Company”) was notified by James Bubeck of his intent to retire as Vice President of Global Sales and Chief Revenue Officer of the Company, effective September 2, 2025.

Item 7.01 Regulation FD Disclosure.

Mark Andrew Harris will become the new Vice President of Global Sales and Chief Revenue Officer of the Company, effective upon Mr. Bubeck’s retirement.

Mr. Harris, age 61, joined the Company in 2023 as a result of the Company’s acquisition of Sprint Communications from T-Mobile, serving in the capacity of Vice President of European Sales. He had been involved with the Sprint business in various sales capacities since April 2003.

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned hereunto duly authorized.

	Cogent Communications Holdings, Inc.

August 15, 2025	By:	/s/ David Schaeffer
		Name: David Schaeffer
		Title: President and Chief Executive Officer

COGENT COMMUNICATIONS HOLDINGS, INC. 8-K