| Sep 2, 2026 SForm 4 → | Sep 3, 9:45 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 4,850 | $9.37 | $45,445 | 193,050 | −2.45% | |
| Jun 16, 2026 SForm 4 → | Jun 16, 4:25 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 4,850 | $16.79 | $81,434 | 197,900 | −2.39% | |
| Mar 12, 2019 SForm 4 → | Mar 12, 4:16 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 5,000 | $50.00 | $250,000 | 61,050 | −7.57% | plan? |
| Dec 14, 2018 SForm 4 → | Dec 14, 4:05 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 3,000 | $46.89 | $140,658 | 66,050 | −4.34% | plan? |
| Sep 5, 2018 SForm 4 → | Sep 5, 3:45 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 4,500 | $53.55 | $240,975 | 69,050 | −6.12% | plan? |
| Jun 4, 2018 SForm 4 → | Jun 5, 8:35 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 4,500 | $51.12 | $230,039 | 73,550 | −5.77% | plan? |
| May 9, 2018 SForm 4 → | May 9, 4:16 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 3,000 | $49.32 | $147,952 | 78,050 | −3.70% | plan? |
| Mar 12, 2018 SForm 4 → | Mar 12, 4:45 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 6,000 | $45.17 | $271,015 | 81,050 | −6.89% | plan? |
| Feb 21, 2018 AForm 4 → | Feb 22, 4:43 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 19,400 | — | — | 87,050 | — | plan? |
| Dec 7, 2017 SForm 4 → | Dec 7, 4:15 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 2,000 | $45.81 | $91,616 | 67,650 | −2.87% | plan? |
| Sep 1, 2017 SForm 4 → | Sep 5, 10:29 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 3,000 | $47.03 | $141,093 | 69,650 | −4.13% | plan? |
| Aug 7, 2017 SForm 4 → | Aug 7, 2:58 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 2,250 | $43.51 | $97,898 | 72,650 | −3.00% | plan? |
| Jun 15, 2017 SForm 4 → | Jun 15, 3:29 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 2,250 | $40.76 | $91,708 | 74,900 | −2.92% | plan? |
| Jun 2, 2017 SForm 4 → | Jun 5, 11:06 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 2,250 | $41.20 | $92,702 | 77,150 | −2.83% | plan? |
| May 3, 2017 AForm 4 → | May 3, 4:13 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 19,400 | — | — | 79,400 | — | plan? |
| Mar 15, 2017 SForm 4 → | Mar 15, 5:08 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 2,250 | $41.17 | $92,625 | 60,000 | −3.61% | plan? |
| Jan 4, 2017 SForm 4 → | Jan 5, 9:37 am EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 5,000 | $42.50 | $212,500 | 62,250 | −7.43% | plan? |
| Jan 3, 2017 SForm 4 → | Jan 3, 4:59 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 20,000 | $41.52 | $830,326 | 67,250 | −22.9% | plan? |
| Dec 13, 2016 SForm 4 → | Dec 13, 4:02 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 2,000 | $40.68 | $81,350 | 87,250 | −2.24% | plan? |
| Dec 7, 2016 SForm 4 → | Dec 7, 4:25 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 5,000 | $37.91 | $189,530 | 89,250 | −5.31% | plan? |
| Jun 3, 2016 SForm 4 → | Jun 3, 5:30 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 5,000 | $40.07 | $200,333 | 94,250 | −5.04% | plan? |
| May 9, 2016 SForm 4 → | May 10, 9:57 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 4,250 | $39.14 | $166,353 | 99,250 | −4.11% | plan? |
| May 4, 2016 AForm 4 → | May 5, 10:38 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 24,250 | — | — | 103,500 | — | plan? |
| Feb 29, 2016 SForm 4 → | Feb 29, 1:22 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 5,250 | $36.87 | $193,550 | 79,250 | −6.21% | plan? |
| Nov 9, 2015 SForm 4 → | Nov 9, 1:58 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 10,000 | $34.61 | $346,132 | 84,500 | −10.6% | plan? |
| Mar 16, 2015 SForm 4 → | Mar 16, 3:14 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 4,250 | $35.26 | $149,847 | 94,500 | −4.30% | plan? |