# Cogent Communications Holdings, Inc.: filings

CCOI · Nasdaq · CIK 1158324 · [Communication](/sectors/communication.md) · fiscal year ends Dec 31

Pages: [Overview](/companies/ccoi.md) · [Financials](/companies/ccoi/financials.md) · [Filings](/companies/ccoi/filings.md) · [Insiders](/companies/ccoi/insiders.md)

## Reports and events: 275 filings

Newest first, by EDGAR acceptance time (Eastern). Filter with ?form= one of: `periodic`, `8-K`, `10-K`, `10-Q`, `4`, `proxy`, `13dg`, `all`, or any form this company filed (4 1360, 8-K 178, 144 133, SC 13G/A 84, 10-Q 53, DEF 14A 19, 10-K 18, 3 18, UPLOAD 17, 4/A 14, SC 13G 13, CORRESP 11, S-8 9, SCHEDULE 13G/A 8, 8-K/A 7, DEFA14A 6, ARS 4, PRE 14A 4, SCHEDULE 13G 3, 144/A 1, 8-K12G3 1, CT ORDER 1, IRANNOTICE 1, PRER14A 1, SC TO-I 1, SC TO-I/A 1).

| Filed | Accepted | Form | What it is | Accession |
| --- | --- | --- | --- | --- |
| 2026-08-06 | 15:21 ET | [10-Q](/filings/0001104659-26-091790.md) | Quarterly report, period 2026-06-30 | 0001104659-26-091790 |
| 2026-08-06 | 11:19 ET | [8-K](/filings/0001104659-26-091634.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001104659-26-091634 |
| 2026-06-29 | 20:29 ET | [8-K](/filings/0001104659-26-078858.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001104659-26-078858 |
| 2026-06-15 | 20:20 ET | [8-K](/filings/0001104659-26-074046.md) | 1.01 Entry into a material agreement; 9.01 Financial statements and exhibits | 0001104659-26-074046 |
| 2026-05-26 | 20:15 ET | [8-K](/filings/0001104659-26-066279.md) | 1.01 Entry into a material agreement; 8.01 Other events; 9.01 Financial statements and exhibits | 0001104659-26-066279 |
| 2026-05-04 | 19:35 ET | [8-K](/filings/0001104659-26-054817.md) | 5.02 Departure or appointment of officers or directors; 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0001104659-26-054817 |
| 2026-05-04 | 15:52 ET | [10-Q](/filings/0001104659-26-054611.md) | Quarterly report, period 2026-03-31 | 0001104659-26-054611 |
| 2026-05-04 | 11:05 ET | [8-K](/filings/0001104659-26-054436.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001104659-26-054436 |
| 2026-03-20 | 20:29 ET | [DEF 14A](/filings/0001104659-26-032744.md) | Proxy statement, period 2026-05-01 | 0001104659-26-032744 |
| 2026-02-20 | 16:11 ET | [10-K](/filings/0001104659-26-017968.md) | Annual report, period 2025-12-31 | 0001104659-26-017968 |
| 2026-02-20 | 12:20 ET | [8-K](/filings/0001104659-26-017862.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001104659-26-017862 |
| 2026-01-07 | 21:03 ET | [8-K](/filings/0001104659-26-001748.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0001104659-26-001748 |
| 2025-11-17 | 22:30 ET | [8-K](/filings/0001104659-25-113284.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001104659-25-113284 |
| 2025-11-06 | 16:13 ET | [10-Q](/filings/0001104659-25-107544.md) | Quarterly report, period 2025-09-30 | 0001104659-25-107544 |
| 2025-11-06 | 12:16 ET | [8-K](/filings/0001104659-25-107367.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001104659-25-107367 |
| 2025-08-15 | 20:30 ET | [8-K](/filings/0001104659-25-079272.md) | 5.02 Departure or appointment of officers or directors; 7.01 Regulation FD disclosure | 0001104659-25-079272 |
| 2025-08-07 | 14:49 ET | [10-Q](/filings/0001410578-25-001593.md) | Quarterly report, period 2025-06-30 | 0001410578-25-001593 |
| 2025-08-07 | 11:29 ET | [8-K](/filings/0001104659-25-074979.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001104659-25-074979 |
| 2025-06-17 | 20:15 ET | [8-K](/filings/0001104659-25-060259.md) | 1.01 Entry into a material agreement; 2.03 New direct financial obligation; 9.01 Financial statements and exhibits | 0001104659-25-060259 |
| 2025-06-03 | 20:51 ET | [8-K](/filings/0001104659-25-056008.md) | 7.01 Regulation FD disclosure | 0001104659-25-056008 |
| 2025-06-02 | 17:39 ET | [8-K](/filings/0001104659-25-055357.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001104659-25-055357 |
| 2025-05-08 | 16:19 ET | [8-K](/filings/0001104659-25-046003.md) | 5.02 Departure or appointment of officers or directors; 5.03 Amendment to articles or bylaws; 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0001104659-25-046003 |
| 2025-05-08 | 15:47 ET | [10-Q](/filings/0001410578-25-001105.md) | Quarterly report, period 2025-03-31 | 0001410578-25-001105 |
| 2025-05-08 | 11:18 ET | [8-K](/filings/0001104659-25-045878.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001104659-25-045878 |
| 2025-04-11 | 20:41 ET | [8-K](/filings/0001104659-25-034257.md) | 1.01 Entry into a material agreement; 2.03 New direct financial obligation; 9.01 Financial statements and exhibits | 0001104659-25-034257 |
| 2025-04-04 | 21:06 ET | [8-K](/filings/0001104659-25-032266.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001104659-25-032266 |
| 2025-03-26 | 20:00 ET | [DEF 14A](/filings/0001104659-25-028214.md) | Proxy statement, period 2025-05-07 | 0001104659-25-028214 |
| 2025-03-12 | 20:01 ET | [8-K](/filings/0001104659-25-022963.md) | 1.01 Entry into a material agreement; 9.01 Financial statements and exhibits | 0001104659-25-022963 |
| 2025-02-28 | 15:13 ET | [10-K](/filings/0001410578-25-000226.md) | Annual report, period 2024-12-31 | 0001410578-25-000226 |
| 2025-02-27 | 12:30 ET | [8-K](/filings/0001104659-25-017789.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001104659-25-017789 |
| 2025-01-15 | 21:01 ET | [8-K](/filings/0001104659-25-003746.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0001104659-25-003746 |
| 2024-11-07 | 17:14 ET | [10-Q](/filings/0001410578-24-001788.md) | Quarterly report, period 2024-09-30 | 0001410578-24-001788 |
| 2024-11-07 | 12:21 ET | [8-K](/filings/0001104659-24-115061.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001104659-24-115061 |
| 2024-08-08 | 15:59 ET | [10-Q](/filings/0001410578-24-001206.md) | Quarterly report, period 2024-06-30 | 0001410578-24-001206 |
| 2024-08-08 | 11:15 ET | [8-K](/filings/0001104659-24-087003.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001104659-24-087003 |
| 2024-06-11 | 20:35 ET | [8-K](/filings/0001104659-24-070425.md) | 1.01 Entry into a material agreement; 2.03 New direct financial obligation; 9.01 Financial statements and exhibits | 0001104659-24-070425 |
| 2024-06-06 | 20:35 ET | [8-K](/filings/0001104659-24-069113.md) | 7.01 Regulation FD disclosure | 0001104659-24-069113 |
| 2024-06-05 | 11:47 ET | [8-K](/filings/0001104659-24-068515.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001104659-24-068515 |
| 2024-05-09 | 16:28 ET | [10-Q](/filings/0001410578-24-000677.md) | Quarterly report, period 2024-03-31 | 0001410578-24-000677 |
| 2024-05-09 | 11:15 ET | [8-K](/filings/0001104659-24-059108.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001104659-24-059108 |
| 2024-05-08 | 20:02 ET | [8-K](/filings/0001104659-24-058652.md) | 5.07 Shareholder vote results; 9.01 Financial statements and exhibits | 0001104659-24-058652 |
| 2024-05-06 | 22:25 ET | [8-K](/filings/0001104659-24-057099.md) | 1.01 Entry into a material agreement; 2.03 New direct financial obligation; 9.01 Financial statements and exhibits | 0001104659-24-057099 |
| 2024-04-25 | 14:07 ET | [8-K](/filings/0001104659-24-051723.md) | 7.01 Regulation FD disclosure; 9.01 Financial statements and exhibits | 0001104659-24-051723 |
| 2024-04-19 | 23:49 ET | [8-K](/filings/0001104659-24-048968.md) | 7.01 Regulation FD disclosure | 0001104659-24-048968 |
| 2024-03-25 | 20:00 ET | [DEF 14A](/filings/0001104659-24-038424.md) | Proxy statement, period 2024-05-08 | 0001104659-24-038424 |
| 2024-02-29 | 16:34 ET | [10-K](/filings/0001410578-24-000091.md) | Annual report, period 2023-12-31 | 0001410578-24-000091 |
| 2024-02-29 | 12:08 ET | [8-K](/filings/0001104659-24-029043.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001104659-24-029043 |
| 2024-01-05 | 22:13 ET | [8-K](/filings/0001104659-24-001889.md) | 5.02 Departure or appointment of officers or directors; 9.01 Financial statements and exhibits | 0001104659-24-001889 |
| 2023-11-09 | 21:03 ET | [10-Q](/filings/0001410578-23-002293.md) | Quarterly report, period 2023-09-30 | 0001410578-23-002293 |
| 2023-11-09 | 12:23 ET | [8-K](/filings/0001104659-23-115992.md) | 2.02 Results of operations; 9.01 Financial statements and exhibits | 0001104659-23-115992 |

Page 1 of 6. [Older](/companies/ccoi/filings.md?page=2)
Source: SEC EDGAR, the company’s filing index. Last ingested by Listed: Oct 24, 2026, 15:05 ET. No prices; not investment advice.