As of November 6, 2026, 4 holders' latest Schedule 13D or 13G filings report owning 5% or more of Cogent Communications Holdings, Inc. The largest reported stake is Turtle Creek Asset Management Inc.'s, at 8.2%. 12 filings are on record since July 18, 2025 (Schedule 13G/A, February 17, 2026).
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Key facts
- · Reporting person: BlackRock, Inc. · Sole voting: 3,859,290 · Shared voting: 0 · Sole dispositive: 3,932,477 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-10-05
- · Reporting person: State Street Corporation · Sole voting: 0 · Shared voting: 2,637,355 · Sole dispositive: 0 · Shared dispositive: 2,779,396 · SCHEDULE 13G, 2026-08-07
- · Reporting person: Vanguard Portfolio Management · Sole voting: 46,601 · Shared voting: 0 · Sole dispositive: 2,431,530 · Shared dispositive: 0 · SCHEDULE 13G/A, 2026-07-31
- · Reporting person: Park West Asset Management LLC · Sole voting: 0 · Shared voting: 2,806,339 · Sole dispositive: 0 · Shared dispositive: 2,806,339 · SCHEDULE 13G/A, 2026-06-17
- · Holder: Park West Asset Management LLC · Percent: 5.1% · SCHEDULE 13G
Cogent Communications Holdings, Inc. has 12 Schedule 13D or 13G filings on record since 2025-07-18. 4 holders' latest filing reports 5% or more of common stock. Each figure below is the holder's own, as filed, with the filing linked.
Holders
| Holder | Percent | Shares | Latest | Event date |
|---|---|---|---|---|
| Turtle Creek Asset Management Inc. | 8.2% | 4,036,847 | SCHEDULE 13G/A, 2026-02-17 | 2025-12-31 |
| BlackRock, Inc. | 7.7% | 3,932,477 | SCHEDULE 13G/A, 2026-10-05 | 2026-09-30 |
| Park West Asset Management LLC | 5.6% | 2,806,339 | SCHEDULE 13G/A, 2026-06-17 | 2026-06-10 |
| State Street Corporation | 5.5% | 2,779,396 | SCHEDULE 13G, 2026-08-07 | 2026-06-30 |
| Vanguard Portfolio Management | 4.85% | 2,431,530 | SCHEDULE 13G/A, 2026-07-31 | 2026-06-30 |
| The Vanguard Group | 0% | 0 | SCHEDULE 13G/A, 2026-03-26 | 2026-03-13 |
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Keep reading
More on Cogent Communications Holdings, Inc. and the records around it.
Cogent Communications Holdings, Inc. elsewhere on the record
Companies that share a holder
- Park West Asset Management LLC also filed stake reports on 2 other companies: Porch Group, Inc. (Jun 2026)
- Turtle Creek Asset Management Inc. also filed stake reports on 6 other companies: ENCORE CAPITAL GROUP, INC. (Feb 2026), BRP Inc. (Nov 2025), JELD-WEN Holding, Inc. (Aug 2025)
- STATE STREET CORPORATION also filed stake reports on 343 other companies: TRADE DESK INC/THE (Oct 2026), CENTRUS ENERGY CORP (Sep 2026), ACADIA PHARMACEUTICALS INC (Aug 2026)
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What the Full Report on Cogent Communications Holdings, Inc. covers
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Which Company This Is
What They Do, And How The Money Works
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Voting and dispositive power, as filed
| Reporting person | Sole voting | Shared voting | Sole dispositive | Shared dispositive | Filing |
|---|---|---|---|---|---|
| BlackRock, Inc. | 3,859,290 | 0 | 3,932,477 | 0 | SCHEDULE 13G/A, 2026-10-05 |
| Park West Asset Management LLC | 0 | 2,806,339 | 0 | 2,806,339 | SCHEDULE 13G/A, 2026-06-17 |
| Park West Investors Master Fund, Limited | 0 | 2,523,845 | 0 | 2,523,845 | SCHEDULE 13G/A, 2026-06-17 |
| Peter S. Park | 0 | 2,806,339 | 0 | 2,806,339 | SCHEDULE 13G/A, 2026-06-17 |
| State Street Corporation | 0 | 2,637,355 | 0 | 2,779,396 | SCHEDULE 13G, 2026-08-07 |
| Vanguard Portfolio Management | 46,601 | 0 | 2,431,530 | 0 | SCHEDULE 13G/A, 2026-07-31 |
The latest filing identifies Cogent Communications Holdings, Inc. by CUSIP 19239V302 and gives its principal executive office as 2450 N STREET, NW, WASHINGTON, DC 20037 (SCHEDULE 13G/A, 2026-10-05).
Timeline
| Filed | Holder | Percent | Filing |
|---|---|---|---|
| 2025-07-18 | BlackRock, Inc. | 13% | SCHEDULE 13G/A |
| 2025-08-14 | Turtle Creek Asset Management Inc. | 5.7% | SCHEDULE 13G |
| 2025-11-14 | Turtle Creek Asset Management Inc. | 9.4% | SCHEDULE 13G/A |
| 2026-01-23 | BlackRock, Inc. | 14.4% | SCHEDULE 13G/A |
| 2026-02-17 | Turtle Creek Asset Management Inc. | 8.2% | SCHEDULE 13G/A |
| 2026-03-26 | The Vanguard Group | 0% | SCHEDULE 13G/A |
| 2026-04-29 | Vanguard Portfolio Management | 5.57% | SCHEDULE 13G |
| 2026-05-22 | Park West Asset Management LLC | 5.1% | SCHEDULE 13G |
| 2026-06-17 | Park West Asset Management LLC | 5.6% | SCHEDULE 13G/A |
| 2026-07-31 | Vanguard Portfolio Management | 4.85% | SCHEDULE 13G/A |
| 2026-08-07 | State Street Corporation | 5.5% | SCHEDULE 13G |
| 2026-10-05 | BlackRock, Inc. | 7.7% | SCHEDULE 13G/A |
Questions about who owns Cogent Communications Holdings, Inc.
Who owns Cogent Communications Holdings, Inc.?
On this page, 4 holders' latest ownership filings report 5% or more of Cogent Communications Holdings, Inc.: Turtle Creek Asset Management Inc. (8.2%, Schedule 13G/A, filed 2026-02-17), BlackRock, Inc. (7.7%, Schedule 13G/A, filed 2026-10-05), Park West Asset Management LLC (5.6%, Schedule 13G/A, filed 2026-06-17) and State Street Corporation (5.5%, Schedule 13G, filed 2026-08-07).
Who are the largest shareholders of Cogent Communications Holdings, Inc.?
By the share each holder's latest filing reports, the largest holders of Cogent Communications Holdings, Inc. on this page are Turtle Creek Asset Management Inc. (8.2%), BlackRock, Inc. (7.7%) and Park West Asset Management LLC (5.6%).
When did Turtle Creek Asset Management Inc. buy into Cogent Communications Holdings, Inc.?
The filings give report dates, not purchase dates. The earliest filing from Turtle Creek Asset Management Inc. on this page is the Schedule 13G, filed 2025-08-14, reporting 5.7%; its latest, Schedule 13G/A filed 2026-02-17, reports 8.2%.
Is this an audit or a full list?
Neither. The ownership list on this page covers only Schedule 13D and 13G filings, which holders make once they own 5% or more of a class of shares (an amendment can report a stake that has since fallen below 5%); 12 such filings are shown here. It is not an audit and not a full cap table: holders who never reached 5% are not listed, and a stake can change after its latest filing.
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Where this comes from
Anyone who comes to own more than 5% of a class of a listed company's voting shares has to tell the SEC. A holder who may seek to change or influence the company files Schedule 13D, and has to say in Item 4, "Purpose of Transaction", what it intends to do. A holder with no such intent, such as many index and passive funds, may file the shorter Schedule 13G. Both are amended when the stake changes, including when it falls below 5%.
Every row here is one of those filings, linked to the filing itself. Percentages and share counts are exactly as the holder filed them, for the holder the filing names; an amendment showing a lower figure is shown as filed. Item 4 text is quoted word for word. Where a 13D's Item 4 contains a sentence stating a definite intent to influence the company, that sentence is marked and quoted; the page does not describe the holder or its motives beyond the words it filed. Nothing here is investment advice.