| Mar 1, 2019 SForm 4 → | Mar 4, 11:05 am EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 2,400 | $49.00 | $117,596 | 36,440 | −6.18% | plan? |
| Dec 3, 2018 SForm 4 → | Dec 4, 11:56 am EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 3,000 | $49.16 | $147,473 | 38,840 | −7.17% | plan? |
| Sep 13, 2018 SForm 4 → | Sep 13, 2:08 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 4,000 | $54.92 | $219,689 | 41,840 | −8.73% | plan? |
| Sep 12, 2018 SForm 4 → | Sep 12, 3:26 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 2,000 | $54.96 | $109,910 | 45,840 | −4.18% | plan? |
| Sep 4, 2018 SForm 4 → | Sep 4, 5:18 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 3,000 | $53.95 | $161,857 | 47,840 | −5.90% | plan? |
| Jun 1, 2018 SForm 4 → | Jun 1, 5:13 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 3,000 | $51.14 | $153,434 | 50,840 | −5.57% | plan? |
| Mar 1, 2018 SForm 4 → | Mar 1, 5:34 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 3,000 | $43.17 | $129,519 | 53,840 | −5.28% | plan? |
| Feb 21, 2018 AForm 4 → | Feb 22, 4:48 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 9,600 | — | — | 56,840 | — | plan? |
| Dec 1, 2017 SForm 4 → | Dec 1, 5:12 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 3,000 | $46.51 | $139,534 | 47,240 | −5.97% | plan? |
| Sep 1, 2017 SForm 4 → | Sep 5, 8:51 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 3,000 | $46.75 | $140,261 | 50,240 | −5.63% | plan? |
| Jun 1, 2017 SForm 4 → | Jun 2, 4:18 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 3,000 | $40.20 | $120,606 | 53,240 | −5.33% | plan? |
| May 3, 2017 AForm 4 → | May 3, 4:16 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 9,600 | — | — | 56,240 | — | plan? |
| Mar 1, 2017 SForm 4 → | Mar 2, 9:11 am EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 3,000 | $42.00 | $125,990 | 46,640 | −6.04% | plan? |
| Dec 1, 2016 SForm 4 → | Dec 2, 8:00 am EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $36.99 | $36,990 | 49,640 | −1.97% | plan? |
| Nov 1, 2016 SForm 4 → | Nov 1, 5:02 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $36.40 | $36,400 | 50,640 | −1.94% | plan? |
| Oct 3, 2016 SForm 4 → | Oct 3, 5:10 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $36.24 | $36,236 | 51,640 | −1.90% | plan? |
| Sep 1, 2016 SForm 4 → | Sep 2, 2:58 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $35.40 | $35,404 | 52,640 | −1.86% | plan? |
| Aug 1, 2016 SForm 4 → | Aug 2, 11:49 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $43.27 | $43,267 | 53,640 | −1.83% | plan? |
| Jul 1, 2016 SForm 4 → | Jul 5, 11:29 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $40.09 | $40,089 | 54,640 | −1.80% | plan? |
| Jun 1, 2016 SForm 4 → | Jun 2, 4:47 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $39.69 | $39,685 | 55,640 | −1.77% | plan? |
| May 4, 2016 AForm 4 → | May 5, 10:39 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 12,000 | — | — | 56,640 | — | plan? |
| May 2, 2016 SForm 4 → | May 2, 5:06 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $38.95 | $38,952 | 44,640 | −2.19% | plan? |
| Apr 1, 2016 SForm 4 → | Apr 4, 11:29 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $39.00 | $38,996 | 45,640 | −2.14% | plan? |
| Dec 1, 2015 SForm 4 → | Dec 2, 10:42 am EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $33.96 | $33,961 | 46,640 | −2.10% | plan? |
| Nov 2, 2015 SForm 4 → | Nov 2, 5:22 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $31.12 | $31,119 | 47,640 | −2.06% | plan? |
| Oct 1, 2015 SForm 4 → | Oct 1, 5:14 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $26.83 | $26,827 | 48,640 | −2.01% | plan? |
| Sep 1, 2015 SForm 4 → | Sep 1, 4:38 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $27.42 | $27,417 | 49,640 | −1.97% | plan? |
| Aug 3, 2015 SForm 4 → | Aug 3, 4:54 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $31.51 | $31,509 | 50,640 | −1.94% | plan? |
| Jul 1, 2015 SForm 4 → | Jul 2, 11:48 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $33.69 | $33,689 | 51,640 | −1.90% | plan? |
| Jun 1, 2015 SForm 4 → | Jun 2, 11:22 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $31.25 | $31,254 | 52,640 | −1.86% | plan? |
| May 1, 2015 SForm 4 → | May 4, 10:10 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $35.08 | $35,082 | 53,640 | −1.83% | plan? |
| Apr 1, 2015 SForm 4 → | Apr 2, 9:55 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $35.16 | $35,159 | 54,640 | −1.80% | plan? |
| Mar 2, 2015 SForm 4 → | Mar 2, 5:21 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $36.38 | $36,378 | 55,640 | −1.77% | plan? |
| Feb 2, 2015 SForm 4 → | Feb 3, 12:02 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $37.51 | $37,509 | 56,640 | −1.73% | plan? |
| Jan 2, 2015 SForm 4 → | Jan 2, 5:21 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $35.15 | $35,147 | 57,640 | −1.71% | plan? |