| SC 13G/A | 2024-02-13 | VANGUARD GROUP INC | COGENT COMMUNICATIONS HOLDINGS, INC. | 5,081,633 | 10.4% | EDGAR |
| SC 13G/A | 2024-01-26 | VAUGHAN NELSON INVESTMENT MANAGEMENT, L.P. | COGENT COMMUNICATIONS HOLDINGS, INC. | 0 | 0.0% | EDGAR |
| SC 13G/A | 2024-01-22 | BlackRock Inc. | COGENT COMMUNICATIONS HOLDINGS, INC. | 7,336,041 | 15.1% | EDGAR |
| SC 13G/A | 2023-02-09 | VANGUARD GROUP INC | COGENT COMMUNICATIONS HOLDINGS, INC. | 5,226,031 | 10.9% | EDGAR |
| SC 13G | 2023-02-03 | VAUGHAN NELSON INVESTMENT MANAGEMENT, L.P. | COGENT COMMUNICATIONS HOLDINGS, INC. | 2,565,270 | 5.3% | EDGAR |
| SC 13G/A | 2023-01-30 | BlackRock Inc. | COGENT COMMUNICATIONS HOLDINGS, INC. | 7,473,928 | 15.6% | EDGAR |
| SC 13G/A | 2022-02-10 | RENAISSANCE TECHNOLOGIES LLC | COGENT COMMUNICATIONS HOLDINGS, INC. | 2,178,356 | 4.6% | EDGAR |
| SC 13G/A | 2022-02-09 | VANGUARD GROUP INC | COGENT COMMUNICATIONS HOLDINGS, INC. | 4,835,162 | 10.1% | EDGAR |
| SC 13G/A | 2022-01-27 | BlackRock Inc. | COGENT COMMUNICATIONS HOLDINGS, INC. | 7,072,055 | 14.8% | EDGAR |
| SC 13G/A | 2022-01-25 | BlackRock Inc. | COGENT COMMUNICATIONS HOLDINGS, INC. | 7,072,055 | 14.8% | EDGAR |
| SC 13G/A | 2021-05-10 | VANGUARD GROUP INC | COGENT COMMUNICATIONS HOLDINGS, INC. | 4,764,937 | 10.0% | EDGAR |
| SC 13G/A | 2021-02-11 | RENAISSANCE TECHNOLOGIES LLC | COGENT COMMUNICATIONS HOLDINGS, INC. | 2,697,156 | 5.7% | EDGAR |
| SC 13G/A | 2021-02-10 | VANGUARD GROUP INC | COGENT COMMUNICATIONS HOLDINGS, INC. | 4,630,490 | 9.8% | EDGAR |
| SC 13G/A | 2021-01-26 | BlackRock Inc. | COGENT COMMUNICATIONS HOLDINGS, INC. | 6,486,585 | 13.7% | EDGAR |
| SC 13G/A | 2020-02-13 | RENAISSANCE TECHNOLOGIES LLC | COGENT COMMUNICATIONS HOLDINGS, INC. | 3,588,366 | 7.7% | EDGAR |
| SC 13G/A | 2020-02-12 | VANGUARD GROUP INC | COGENT COMMUNICATIONS HOLDINGS, INC. | 4,710,530 | 10.0% | EDGAR |
| SC 13G/A | 2020-02-04 | BlackRock Inc. | COGENT COMMUNICATIONS HOLDINGS, INC. | 6,884,595 | 14.7% | EDGAR |
| SC 13G/A | 2019-05-10 | VANGUARD GROUP INC | COGENT COMMUNICATIONS HOLDINGS, INC. | 4,777,129 | 10.3% | EDGAR |
| SC 13G/A | 2019-02-13 | RENAISSANCE TECHNOLOGIES LLC | COGENT COMMUNICATIONS HOLDINGS, INC. | 3,413,600 | 7.4% | EDGAR |
| SC 13G/A | 2019-02-11 | VANGUARD GROUP INC | COGENT COMMUNICATIONS HOLDINGS, INC. | 4,575,342 | 9.8% | EDGAR |