Form 8-K

8-K — COGENT COMMUNICATIONS HOLDINGS, INC.

Accession: 0001104659-26-074046

Filed: 2026-06-15

Period: 2026-06-15

CIK: 0001158324

SIC: 4899 (COMMUNICATION SERVICES, NEC)

Item: Entry into a Material Definitive Agreement

Item: Financial Statements and Exhibits

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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):

June 15, 2026

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)

(IRS Employer

Identification No.)

2450 N St NW,

Washington, D.C.

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 1.01. Entry into a Material Definitive Agreement.

On June 15, 2026, Cogent Communications Group,

LLC (“Cogent Group”) and Cogent Finance, Inc. (the “Co-Issuer” and, together with Cogent Group, the “Issuers”),

two wholly owned subsidiaries of Cogent Communications Holdings, Inc. (the “Company”), entered into a First Supplemental

Indenture (the “Supplemental Indenture”) with the Company, the other guarantors named therein and Wilmington Trust, National

Association, as trustee and collateral agent (the “Trustee and Collateral Agent”), to the Indenture, dated as of June 17,

2025 (the “Indenture”), among the Issuers, the Company, the other guarantors named therein, the Trustee and Collateral Agent

to effect certain amendments to the Indenture to: (i) amend the “Permitted Liens” definition therein to increase the

secured leverage ratio under the “ratio liens” basket from 4.00:1.00 to 4.75:1.00; (ii) require the Company to contribute

or otherwise provide to Cogent Group and/or one or more of its restricted subsidiaries the proceeds of certain data center sales and require

Cogent Group to use such proceeds solely to repurchase or otherwise retire existing indebtedness at a discount (with at least 50% of such

proceeds being used to repurchase the Issuers’ existing 6.500% Senior Secured Notes due 2032 (the “Notes”)); (iii) provide

that the proceeds from such data center sales will not be used to increase available restricted payment capacity under the Indenture;

(iv) provide that Cogent Group will not make restricted payments constituting the dividend, distribution, sale, transfer or contribution

of indefeasible rights of use (“IRUs”) and prohibit any IRU that is owned or held by Cogent Group or any guarantor from being

transferred to, assumed by or refinanced by any unrestricted subsidiary or any restricted subsidiary that is not a guarantor, subject

to limited exceptions; and (v) amend, supplement or change certain other provisions in the Indenture related to the foregoing. Entry

into the Supplemental Indenture follows the Issuers’ receipt of consents from holders of a majority of the outstanding aggregate

principal amount of the Notes. The Supplemental Indenture was effective upon execution.

The foregoing description of the Supplemental

Indenture does not purport to be complete and is qualified in its entirety by reference to the Supplemental Indenture, a copy of which

is filed as Exhibit 4.1 to this Current Report on Form 8-K and incorporated into this Item 1.01 by reference.

Item 9.01. Financial Statements and Exhibits.

(d) Exhibits:

Exhibit

Number

Description

4.1

First Supplemental Indenture, dated as of June 15, 2026, among Cogent Communications Group, LLC, Cogent Finance, Inc., the guarantors named therein and Wilmington Trust, National Association, as trustee and collateral agent.

104

Cover Page Interactive Data File (embedded within the Inline XBRL document).

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.

Dated: June 15, 2026

Cogent Communications Holdings, Inc.

By:

/s/ David Schaeffer

Name: David Schaeffer

Title: President and Chief Executive Officer

EX-4.1 — EXHIBIT 4.1

EX-4.1

Filename: tm2617890d1_ex4-1.htm · Sequence: 2

Exhibit 4.1

FIRST SUPPLEMENTAL INDENTURE

Dated as of June 15, 2026

among

COGENT COMMUNICATIONS GROUP, LLC and

COGENT FINANCE, INC., as the Issuers,

the Guarantors party hereto

and

WILMINGTON TRUST, NATIONAL ASSOCIATION,

as Trustee

6.500% SENIOR SECURED NOTES DUE 2032

FIRST SUPPLEMENTAL INDENTURE

(this “Supplemental Indenture”), dated as of June 15, 2026, among Cogent Communications Group, LLC (the “Company”),

Cogent Finance, Inc. (the “Co-Issuer” and, together with the Company, the “Issuers”), the Guarantors

party hereto (the “Guarantors”) and Wilmington Trust, National Association, a national banking association organized

and existing under the laws of the United States of America, as trustee (the “Trustee”) and collateral agent (the “Collateral

Agent”).

W I T N E S S E T H:

WHEREAS, each of the Issuers

and the Guarantors have heretofore executed and delivered to the Trustee and the Collateral Agent an indenture, dated as of June 17,

2025 (the “Original Indenture” and, together with this Supplemental Indenture and any other supplements thereto, the

“Indenture”), providing for the issuance of $600,000,000 aggregate principal amount of the Issuers’ 6.500% Senior

Secured Notes due 2032 (the “Notes”);

WHEREAS, pursuant to Section 9.02

of the Original Indenture, the Issuers, the Guarantors, the Trustee and the Collateral Agent may amend or supplement the Original Indenture

with the consent of the Holders of at least a majority in aggregate principal amount of the Notes then outstanding (the “Requisite

Consents”);

WHEREAS, as of June 15,

2026, the Issuers have received and caused to be delivered to the Trustee evidence of receipt of the Requisite Consents from or on behalf

of Holders to amend the Original Indenture as set forth herein and such evidence is attached to the Officer’s Certificate delivered

as of the date hereof to the Trustee and the Collateral Agent in connection with the execution of this Supplemental Indenture;

WHEREAS, the Issuers and the

Guarantors have each duly authorized the execution and delivery of this Supplemental Indenture; and

NOW, THEREFORE, in consideration

of the foregoing and for other good and valuable consideration, the receipt of which is hereby acknowledged, the parties mutually covenant

and agree for the equal and ratable benefit of the Holders as follows:

1.            Capitalized

Terms. Capitalized terms used herein without definition shall have the meanings assigned to them in the Indenture.

2.            Amendments

to the Original Indenture.

(a)            Section 1.01

(“Definitions”) of the Original Indenture is hereby amended by adding the following definition:

“Data Center Proceeds”

means the net cash proceeds from the sale by Cogent Holdco (or any Subsidiary of Cogent Holdco that is not a Subsidiary of the Company)

of certain data centers, which net cash proceeds are contributed or otherwise provided to the Company and/or one or more of its Restricted

Subsidiaries; provided that only the greater of (i) the first $175.0 million of such net cash proceeds and (ii) the net

cash proceeds from the first 10 such data center sales occurring after June 15, 2026 shall constitute Data Center Proceeds.

(b)            Clause

(5) of the definition of “Permitted Liens” in Section 1.01 (“Definitions”) of the Original Indenture

is hereby amended by replacing the reference therein to “4.00” with “4.75”.

on Restricted Payments”) of the Original Indenture is hereby amended as follows:

“100.0% of the aggregate amount

received by the Company in cash and the Fair Market Value of property other than cash since April 1, 2025 as a contribution to its

common equity capital or from the issue or sale of Equity Interests (other than Disqualified Stock) of the Company or any Restricted Subsidiary

(other than Data Center Proceeds) and the amount of reduction of Indebtedness of the Company or its Restricted Subsidiaries that has been

converted into or exchanged for such Equity Interests (other than Equity Interests sold to, or Indebtedness held by, a Subsidiary of the

Company); plus”

(d)            Section 4.04(b)(3) (“Limitation

on Restricted Payments”) of the Original Indenture is hereby amended as follows:

“any Restricted Payment in exchange

for, or out of the net proceeds of a contribution to the common equity of the Company or a substantially concurrent sale (other than to

a Subsidiary of the Company) of, Equity Interests (other than Disqualified Stock) of the Company or, to the extent the proceeds from such

contribution or sale of Equity Interests are contributed to the common equity capital of the Company or used to purchase Capital Stock

(other than Disqualified Stock) of the Company, a direct or indirect parent of the Company (other than Data Center Proceeds); provided

that the amount of any such net proceeds that are utilized for such Restricted Payment will be excluded from Section 4.04(a)(3)(b);”

(e)            Section 4.04

(“Limitation on Restricted Payments”) of the Original Indenture is hereby amended by adding paragraphs (e) and (f) as

follows:

“(e)         Notwithstanding

the foregoing, the Company may not make a Restricted Payment constituting the dividend, distribution, sale, transfer or contribution of

IRUs, whether directly or through a dividend or distribution of the Equity Interests of an entity or entities that is or are the owner(s) of

such IRUs. In addition, no IRU that is owned or held by the Company or any Guarantor as of June 15, 2026, may be transferred to,

assumed by or refinanced by any Unrestricted Subsidiary or any Restricted Subsidiary that is not a Guarantor, except (1) in connection

with bona fide tax planning or reorganization activities or (2) any transfers, assumptions or refinancings of IRUs having

an aggregate Fair Market Value (measured on the date of each applicable transfer, assumption or refinancing and without giving effect

to subsequent changes in value) not exceeding $50.0 million.

(f)            The

Company shall utilize Data Center Proceeds only to repurchase, defease or otherwise retire Indebtedness at a discount to the par value

thereof or at maturity of such Indebtedness, and at least 50.0% of the aggregate Data Center Proceeds shall be used to redeem, repurchase,

defease or otherwise retire the Notes at a discount to the par value thereof or at maturity of the Notes.”

(f)            A

new Section 4.18 (“Data Center Proceeds”) is hereby added following Section 4.17 (“Post-Closing Undertakings”)

in the Original Indenture:

“Section 4.18         Data

Center Proceeds. Cogent Holdco shall contribute or otherwise provide to the Company and/or one or more of its Restricted Subsidiaries

all Data Center Proceeds within 30 days of receipt thereof by Cogent Holdco or any of its Subsidiaries.”

3.            Effectiveness.

This Supplemental Indenture will become effective immediately upon its execution and delivery by the parties hereto.

4.            Governing

Law. THIS SUPPLEMENTAL INDENTURE WILL BE GOVERNED BY AND CONSTRUED IN ACCORDANCE WITH THE LAWS OF THE STATE OF NEW YORK.

5.            Ratification

and Reaffirmation of Indenture; Supplemental Indenture Part of Indenture. Except as expressly amended hereby, the Indenture (including

the Guarantees contained therein) is in all respects ratified and reaffirmed and all the terms, conditions and provisions thereof shall

remain in full force and effect. This Supplemental Indenture shall form a part of the Indenture for all purposes, and every Holder heretofore

or hereafter authenticated and delivered shall be bound hereby.

-2-

6.            No

Recourse Against Others. No director, officer, employee, incorporator, stockholder, member, manager or partner of either Issuer, any

Subsidiary or any direct or indirect parent of either Issuer, as such, will have any liability for any obligations of either Issuer or

the Guarantors under the Notes, any Note Guarantees, the Indenture or any Supplemental Indenture or for any claim based on, in respect

of, or by reason of, such obligations or their creation. Each Holder by accepting Notes waives and releases all such liability. The waiver

and release are part of the consideration for issuance of the Notes and the Note Guarantees. The waiver may not be effective to waive

liabilities under the federal securities laws and it is the view of the SEC that such a waiver is against public policy.

7.            Counterparts.

The parties may sign any number of copies of this Supplemental Indenture. Each signed copy shall be an original, but all of them together

represent the same agreement. Delivery of an executed counterpart of a signature page to this Supplemental Indenture by facsimile,

email or other electronic means shall be effective as delivery of a manually executed counterpart of this Supplemental Indenture.

8.            Effect

of Headings. The section headings herein are for convenience only and shall not affect the construction hereof.

9.            The

Trustee and the Collateral Agent. Neither the Trustee nor the Collateral Agent shall be responsible in any manner whatsoever for or

in respect of the validity or sufficiency of this Supplemental Indenture or for or in respect of the recitals contained herein, all of

which recitals are made solely by the Issuers. Neither the Trustee nor the Collateral Agent makes any representation or warranty as to

the validity or sufficiency of this Supplemental Indenture or as to the accuracy of the recitals to this Supplemental Indenture.

[Signature Pages Follow]

-3-

IN WITNESS WHEREOF, the parties hereto have caused

this Supplemental Indenture to be duly executed as of the date first above written.

COGENT COMMUNICATIONS GROUP, LLC

By:

/s/David

Schaeffer

Name:

David Schaeffer

Title:

President and Chief Executive Officer

COGENT FINANCE, INC.

By:

/s/ David Schaeffer

Name:

David Schaeffer

Title:

President and Chief Executive Officer

COGENT COMMUNICATIONS, LLC, as Guarantor

By:

/s/

David Schaeffer

Name:

David Schaeffer

Title:

President and Chief Executive Officer

COGENT COMMUNICATIONS, LLC, as sole member of each of:

COGENT IH, LLC,

COGENT WG, LLC, and

SPRINT SOLUTIONS WIRELINE LLC,

as Guarantors

By:

/s/

David Schaeffer

Name:

David Schaeffer

Title:

President and Chief Executive Officer

COGENT COMMUNICATIONS HOLDINGS, INC., as Guarantor

By:

/s/

David Schaeffer

Name:

David Schaeffer

Title:

President and Chief Executive Officer

[Signature Page to First Supplemental Indenture

(6.500% Senior Secured Notes due 2032)]

WILMINGTON TRUST, NATIONAL ASSOCIATION, as Trustee

By:

/s/ Karen Ferry

Name:

Karen Ferry

Title:

Vice President

WILMINGTON TRUST, NATIONAL ASSOCIATION, as Collateral Agent

By:

/s/ Karen Ferry

Name:

Karen Ferry

Title:

Vice President

[Signature

Page to First Supplemental Indenture (6.500% Senior Secured Notes due 2032)]

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