Vanguard Portfolio Management (CCOI) discloses 4.85% Cogent Communications ownership in 13G/A

Rhea-AI Filing Summary

Vanguard Portfolio Management LLC, on behalf of certain affiliated entities and managed funds and accounts, reports updated passive ownership of Cogent Communications Holdings Inc. common stock on a Schedule 13G/A (Amendment No. 1). The group beneficially owns 2,431,530 shares of common stock, representing 4.85% of the class.

Vanguard Portfolio Management has sole voting power over 46,601 shares and sole dispositive power over 2,431,530 shares, with no shared voting or dispositive power. Dividends and sale proceeds are payable to Vanguard-managed investment companies and other managed accounts, and no other single person has an interest in more than 5% of the securities reported.

Key Figures

Beneficially owned shares: 2,431,530 shares Percent of class: 4.85 % Sole voting power: 46,601 shares +3 more

6 metrics

Beneficially owned shares 2,431,530 shares Cogent Communications common stock beneficially owned by Vanguard Portfolio Management

Percent of class 4.85 % Percentage of Cogent Communications common stock class held by Vanguard Portfolio Management

Sole voting power 46,601 shares Shares of Cogent Communications over which Vanguard Portfolio Management has sole voting power

Shared voting power 0 shares Shares over which Vanguard Portfolio Management has shared voting power

Sole dispositive power 2,431,530 shares Shares of Cogent Communications over which Vanguard Portfolio Management has sole dispositive power

Shared dispositive power 0 shares Shares over which Vanguard Portfolio Management has shared dispositive power

Key Terms

beneficially owned, sole voting power, dispositive power, Schedule 13G/A, +1 more

5 terms

beneficially owned financial

"this reflects the securities beneficially owned, or deemed to be beneficially owned, by Vanguard"

Beneficially owned describes securities or assets where a person has the economic rights and control—such as the right to receive dividends and to direct voting—even if legal title is held in another name. Think of it like having the keys and using a car that’s registered to someone else: you get the benefits and make decisions. Investors care because beneficial ownership reveals who truly controls value and voting power, affecting corporate decisions and takeover dynamics.

sole voting power financial

"Sole Voting Power 46,601.00 6 | Shared Voting Power 0.00"

Sole voting power is the exclusive right to cast votes attached to a shareholder’s stock without needing approval from anyone else. Like holding the only remote control for a TV, it lets that holder decide corporate matters such as board members, mergers, and policy changes, making it important to investors because it concentrates control and can strongly influence a company’s strategy and the value of its shares.

dispositive power financial

"Sole Dispositive Power 2,431,530.00 8 | Shared Dispositive Power 0.00"

Dispositive power is the authority to decide the final outcome of an asset, legal claim, contract, or corporate action — in effect the power to dispose of or resolve something. For investors it matters because whoever holds that authority can determine who gets paid, who controls an asset or vote, and how risks and returns are allocated; think of it like holding the key that lets you lock in the winner or loser in a deal.

Schedule 13G/A regulatory

"In accordance with SEC Release No. 34-39538 ... securities beneficially owned ..."

A Schedule 13G/A is an amended public filing with the U.S. securities regulator that updates a previous Schedule 13G, disclosing when an individual or group holds a substantial (typically over 5%) stake in a company and is claiming a passive, non‑controlling intent. Investors monitor these updates because rising or falling holdings can signal changing confidence, potential future moves, or shifts in voting power — like watching a public ledger where large shareholders quietly adjust their positions.

percent of class financial

"Percent of class: 4.85 %"

Percent of class is the portion of a specific category of securities—such as a company’s common shares, preferred shares, or a bond series—that takes part in or approves a corporate action (vote, consent, tender, etc.). Investors watch this number because it reveals how much support or opposition exists within that particular shareholder group; like counting how many members of a club back a proposal, it can determine whether a plan passes or how influence is distributed.

AI-generated analysis. How Rhea-AI works. Not financial advice.

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FAQ

What stake in Cogent Communications (CCOI) does Vanguard Portfolio Management report on this Schedule 13G/A?

Vanguard Portfolio Management reports beneficial ownership of 2,431,530 shares of Cogent Communications common stock, representing 4.85% of the class as disclosed in the Schedule 13G/A (Amendment No. 1).

How much voting power does Vanguard Portfolio Management have in Cogent Communications (CCOI)?

Vanguard Portfolio Management has sole voting power over 46,601 shares of Cogent Communications common stock and no shared voting power, according to the ownership breakdown in the filing.

What dispositive power over Cogent Communications (CCOI) shares does Vanguard Portfolio Management hold?

Vanguard Portfolio Management holds sole dispositive power over 2,431,530 shares of Cogent Communications common stock, with no shared dispositive power, meaning it alone can decide on the disposition of these shares.

Does Vanguard Portfolio Management own more than 5% of Cogent Communications (CCOI)?

No. Vanguard Portfolio Management reports ownership of 4.85% of Cogent Communications common stock, and the filing indicates ownership of 5 percent or less of the class under the relevant item.

Who receives dividends and sale proceeds from the Cogent Communications (CCOI) shares reported by Vanguard Portfolio Management?

Dividends and sale proceeds are payable to Vanguard Portfolio Management clients, including investment companies registered under the Investment Company Act of 1940 and other managed accounts, with no other person’s interest above 5%.

Which Vanguard entities are included in the Cogent Communications (CCOI) Schedule 13G/A filing?

The filing covers securities beneficially owned or deemed owned by Vanguard Portfolio Management LLC and affiliates or business divisions including Vanguard Fiduciary Trust Company and Vanguard Global Advisers, LLC as described in the disclosure.

SECURITIES AND EXCHANGE COMMISSION
Washington, D.C. 20549

SCHEDULE 13G

UNDER THE SECURITIES EXCHANGE ACT OF 1934

(Amendment No. 1)

Cogent Communications Holdings Inc

(Name of Issuer)

Common Stock

(Title of Class of Securities)

19239V302

(CUSIP Number)

06/30/2026

(Date of Event Which Requires Filing of this Statement)

Check the appropriate box to designate the rule pursuant to which this Schedule is filed:

Rule 13d-1(b)

Rule 13d-1(c)

Rule 13d-1(d)

schemaVersion:

SCHEDULE 13G

CUSIP Number(s): 19239V302

1

Names of Reporting Persons

Vanguard Portfolio Management

2

Check the appropriate box if a member of a Group (see instructions)

(a)
(b)

3

Sec Use Only

4

Citizenship or Place of Organization

PENNSYLVANIA

Number of Shares Beneficially Owned by Each Reporting Person With:

5	Sole Voting Power 46,601.00
6	Shared Voting Power 0.00
7	Sole Dispositive Power 2,431,530.00
8	Shared Dispositive Power 0.00

9

Aggregate Amount Beneficially Owned by Each Reporting Person

2,431,530.00

10

Check box if the aggregate amount in row (9) excludes certain shares (See Instructions)

11

Percent of class represented by amount in row (9)

4.85 %

12

Type of Reporting Person (See Instructions)

IA

Comment for Type of Reporting Person: In accordance with SEC Release No. 34-39538 (January 12, 1998), this Schedule 13G reflects the securities beneficially owned, or deemed to be beneficially owned, by Vanguard Portfolio Management LLC and the following affiliates of Vanguard Portfolio Management LLC or business divisions of such affiliates: Vanguard Fiduciary Trust Company and Vanguard Global Advisers, LLC. This Schedule 13G includes securities held by Vanguard funds, or sleeves thereof, over which Vanguard Portfolio Management LLC exercises dispositive power, in addition to securities held by clients over which the affiliates or business divisions of such affiliates indicated above exercise dispositive and/or voting power. This Schedule 13G does not include securities, if any, beneficially owned by other subsidiaries or affiliates of Vanguard Portfolio Management LLC, or business divisions of such subsidiaries whose ownership of securities is disaggregated from that of the reporting business unit in accordance with such release.

SCHEDULE 13G

Item 1.
(a)	Name of issuer: Cogent Communications Holdings Inc
(b)	Address of issuer's principal executive offices: 1015 31st Street, Washington, DC, 20007
Item 2.
(a)	Name of person filing: Vanguard Portfolio Management
(b)	Address or principal business office or, if none, residence: 100 Vanguard Blvd,, Malvern, PA, 19355
(c)	Citizenship: PA
(d)	Title of class of securities: Common Stock
(e)	CUSIP No.: 19239V302
Item 3.	If this statement is filed pursuant to §§ 240.13d-1(b) or 240.13d-2(b) or (c), check whether the person filing is a:
(a)	Broker or dealer registered under section 15 of the Act (15 U.S.C. 78o);
(b)	Bank as defined in section 3(a)(6) of the Act (15 U.S.C. 78c);
(c)	Insurance company as defined in section 3(a)(19) of the Act (15 U.S.C. 78c);
(d)	Investment company registered under section 8 of the Investment Company Act of 1940 (15 U.S.C. 80a-8);
(e)	An investment adviser in accordance with § 240.13d-1(b)(1)(ii)(E);
(f)	An employee benefit plan or endowment fund in accordance with § 240.13d-1(b)(1)(ii)(F);
(g)	A parent holding company or control person in accordance with § 240.13d-1(b)(1)(ii)(G);
(h)	A savings associations as defined in Section 3(b) of the Federal Deposit Insurance Act (12 U.S.C. 1813);
(i)	A church plan that is excluded from the definition of an investment company under section 3(c)(14) of the Investment Company Act of 1940 (15 U.S.C. 80a-3);
(j)	A non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J). If filing as a non-U.S. institution in accordance with § 240.13d-1(b)(1)(ii)(J), please specify the type of institution:
(k)	Group, in accordance with Rule 240.13d-1(b)(1)(ii)(K).
Item 4.	Ownership
(a)	Amount beneficially owned: 2431530
(b)	Percent of class: 4.85 %
(c)	Number of shares as to which the person has:
	(i) Sole power to vote or to direct the vote: 46601
	(ii) Shared power to vote or to direct the vote: 0
	(iii) Sole power to dispose or to direct the disposition of: 2431530
	(iv) Shared power to dispose or to direct the disposition of: 0
Item 5.	Ownership of 5 Percent or Less of a Class.
	Ownership of 5 percent or less of a class
Item 6.	Ownership of more than 5 Percent on Behalf of Another Person.
	If any other person is known to have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, such securities, a statement to that effect should be included in response to this item and, if such interest relates to more than 5 percent of the class, such person should be identified. A listing of the shareholders of an investment company registered under the Investment Company Act of 1940 or the beneficiaries of employee benefit plan, pension fund or endowment fund is not required. Vanguard Portfolio Management, including investment companies registered under the Investment Company Act of 1940 and other managed accounts, have the right to receive or the power to direct the receipt of dividends from, or the proceeds from the sale of, the securities reported herein.No one other person's interest in the securities reported herein is more than 5%.
Item 7.	Identification and Classification of the Subsidiary Which Acquired the Security Being Reported on by the Parent Holding Company or Control Person.
	Not Applicable
Item 8.	Identification and Classification of Members of the Group.
	Not Applicable
Item 9.	Notice of Dissolution of Group.
	Not Applicable

Item 10.

Certifications:

By signing below I certify that, to the best of my knowledge and belief, the securities referred to above were acquired and are held in the ordinary course of business and were not acquired and are not held for the purpose of or with the effect of changing or influencing the control of the issuer of the securities and were not acquired and are not held in connection with or as a participant in any transaction having that purpose or effect, other than activities solely in connection with a nomination under § 240.14a-11.

SIGNATURE

After reasonable inquiry and to the best of my knowledge and belief, I certify that the information set forth in this statement is true, complete and correct.

Vanguard Portfolio Management

Signature:	My Trieu-Gatt
Name/Title:	Authorized Signatory, Head of Global Fund Administration
Date:	07/31/2026