| | 4 | 09/05/2025 | 09/05/2025 | 3.11 KB | | KILMER HENRY W | 000-51829 |
| | 144 | 09/04/2025 | | 3.31 KB | | COGENT COMMUNICATIONS HOLDINGS, INC... | 000-51829 |
| | 4 | 09/03/2025 | 09/02/2025 | 3.29 KB | | HARRIS MARK ANDREW | 000-51829 |
| | 3 | 09/03/2025 | 09/02/2025 | 2.68 KB | | HARRIS MARK ANDREW | 000-51829 |
| | 4 | 09/02/2025 | 09/02/2025 | 3.12 KB | | WEED THADDEUS GERARD | 000-51829 |
| | 144 | 09/02/2025 | | 3.90 KB | | COGENT COMMUNICATIONS HOLDINGS, INC... | 000-51829 |
| | 8-K | 08/15/2025 | 08/11/2025 | 179 KB | | COGENT COMMUNICATIONS HOLDINGS, INC... | 000-51829 |
| | SCHEDULE 13G | 08/14/2025 | | 5.43 KB | | COGENT COMMUNICATIONS HOLDINGS, INC... | 005-78106 |
| | 4 | 08/11/2025 | 08/08/2025 | 3.56 KB | | SCHAEFFER DAVE | 000-51829 |
| | 4 | 08/08/2025 | 08/07/2025 | 3.54 KB | | SCHAEFFER DAVE | 000-51829 |
| | 10-Q | 08/07/2025 | 06/30/2025 | 11.4 MB | | COGENT COMMUNICATIONS HOLDINGS, INC... | 000-51829 |
| | 8-K | 08/07/2025 | 08/07/2025 | 955 KB | | COGENT COMMUNICATIONS HOLDINGS, INC... | 000-51829 |
| | SCHEDULE 13G/A | 07/18/2025 | | 9.06 KB | | COGENT COMMUNICATIONS HOLDINGS, INC... | 005-78106 |
| | 4 | 07/01/2025 | 06/30/2025 | 3.36 KB | | HOWARD EVE N | 000-51829 |
| | 4 | 07/01/2025 | 06/30/2025 | 3.36 KB | | BROOKS STEVEN D | 000-51829 |
| | 4 | 07/01/2025 | 06/30/2025 | 3.36 KB | | DE SA PAUL | 000-51829 |
| | 4 | 07/01/2025 | 06/30/2025 | 3.37 KB | | FERGUSON LEWIS H | 000-51829 |
| | 4 | 07/01/2025 | 06/30/2025 | 3.37 KB | | MONTAGNER MARC | 000-51829 |
| | 4 | 07/01/2025 | 06/30/2025 | 3.37 KB | | KENNEDY SHERYL LYNN | 000-51829 |
| | 4 | 07/01/2025 | 06/30/2025 | 3.36 KB | | HOWELL DENEEN C | 000-51829 |
| | 8-K | 06/17/2025 | 06/17/2025 | 1.31 MB | | COGENT COMMUNICATIONS HOLDINGS, INC... | 000-51829 |
| | 144 | 06/16/2025 | | 18.3 KB | | COGENT COMMUNICATIONS HOLDINGS, INC... | 000-51829 |
| | 4 | 06/16/2025 | 06/16/2025 | 4.60 KB | | SCHAEFFER DAVE | 000-51829 |
| | 144 | 06/16/2025 | | 24.3 KB | | COGENT COMMUNICATIONS HOLDINGS, INC... | 000-51829 |
| | 4 | 06/16/2025 | 06/13/2025 | 4.60 KB | | SCHAEFFER DAVE | 000-51829 |