| Mar 13, 2019 SForm 4 → | Mar 13, 5:24 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 2,000 | $51.00 | $102,000 | 33,652 | −5.61% | plan? |
| Mar 1, 2019 SForm 4 → | Mar 1, 1:54 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 2,000 | $48.96 | $97,920 | 35,652 | −5.31% | plan? |
| Feb 19, 2019 SForm 4 → | Feb 19, 4:25 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $50.00 | $50,000 | 37,652 | −2.59% | plan? |
| Oct 1, 2018 SForm 4 → | Oct 1, 5:58 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $55.80 | $55,800 | 38,652 | −2.52% | plan? |
| Sep 4, 2018 SForm 4 → | Sep 5, 9:06 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $54.50 | $54,500 | 39,652 | −2.46% | plan? |
| Aug 1, 2018 SForm 4 → | Aug 1, 11:44 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $51.95 | $51,950 | 40,652 | −2.40% | plan? |
| Jul 2, 2018 SForm 4 → | Jul 3, 1:16 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $53.00 | $53,000 | 41,652 | −2.34% | plan? |
| Jun 1, 2018 SForm 4 → | Jun 1, 3:23 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $51.30 | $51,300 | 42,652 | −2.29% | plan? |
| May 3, 2018 SForm 4 → | May 3, 2:45 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $50.00 | $50,000 | 43,652 | −2.24% | plan? |
| Apr 12, 2018 SForm 4 → | Apr 12, 1:12 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $45.75 | $45,750 | 44,652 | −2.19% | plan? |
| Mar 1, 2018 SForm 4 → | Mar 2, 5:06 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $42.95 | $42,950 | 45,652 | −2.14% | plan? |
| Feb 21, 2018 AForm 4 → | Feb 22, 4:51 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 9,600 | — | — | 46,652 | — | plan? |
| Dec 8, 2017 SForm 4 → | Dec 11, 10:29 am EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 2,000 | $45.65 | $91,291 | 37,052 | −5.12% | plan? |
| Oct 2, 2017 SForm 4 → | Oct 3, 9:53 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 2,000 | $48.75 | $97,500 | 39,052 | −4.87% | plan? |
| Sep 1, 2017 SForm 4 → | Sep 1, 3:50 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $46.60 | $46,600 | 41,052 | −2.38% | plan? |
| Aug 1, 2017 SForm 4 → | Aug 2, 8:56 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $41.95 | $41,950 | 42,052 | −2.32% | plan? |
| Jul 5, 2017 SForm 4 → | Jul 5, 4:05 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $40.25 | $40,250 | 43,052 | −2.27% | plan? |
| Jun 1, 2017 SForm 4 → | Jun 2, 4:19 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $39.50 | $39,500 | 44,052 | −2.22% | plan? |
| May 3, 2017 AForm 4 → | May 3, 4:24 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 9,600 | — | — | 45,052 | — | plan? |
| May 1, 2017 SForm 4 → | May 1, 11:52 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $45.05 | $45,050 | 35,452 | −2.74% | plan? |
| Apr 3, 2017 SForm 4 → | Apr 3, 4:47 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $43.00 | $43,000 | 36,452 | −2.67% | plan? |
| Mar 1, 2017 SForm 4 → | Mar 1, 4:47 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $41.70 | $41,700 | 37,452 | −2.60% | plan? |
| Dec 1, 2016 SForm 4 → | Dec 1, 2:12 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $37.50 | $37,500 | 38,452 | −2.53% | plan? |
| Nov 1, 2016 SForm 4 → | Nov 1, 4:43 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $36.80 | $36,800 | 39,452 | −2.47% | plan? |
| Oct 3, 2016 SForm 4 → | Oct 3, 4:43 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $36.78 | $36,780 | 40,452 | −2.41% | plan? |
| Sep 1, 2016 SForm 4 → | Sep 1, 5:12 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $35.52 | $35,520 | 41,452 | −2.36% | plan? |
| Aug 1, 2016 SForm 4 → | Aug 1, 3:09 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $42.64 | $42,640 | 42,452 | −2.30% | plan? |
| Jul 1, 2016 SForm 4 → | Jul 5, 11:30 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $39.98 | $39,980 | 43,452 | −2.25% | plan? |
| Jun 1, 2016 SForm 4 → | Jun 3, 11:27 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $39.83 | $39,830 | 44,452 | −2.20% | plan? |
| May 4, 2016 AForm 4 → | May 5, 10:45 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 12,000 | — | — | 45,452 | — | plan? |
| May 2, 2016 SForm 4 → | May 2, 5:05 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $38.90 | $38,900 | 33,452 | −2.90% | plan? |
| Apr 1, 2016 SForm 4 → | Apr 4, 12:13 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $38.72 | $38,720 | 34,452 | −2.82% | plan? |
| Mar 1, 2016 SForm 4 → | Mar 2, 4:11 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $36.89 | $36,890 | 35,452 | −2.74% | plan? |
| Feb 1, 2016 SForm 4 → | Feb 1, 5:02 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $33.16 | $33,160 | 36,452 | −2.67% | plan? |
| Jan 4, 2016 SForm 4 → | Jan 4, 3:22 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $34.19 | $34,190 | 37,452 | −2.60% | plan? |
| Dec 1, 2015 SForm 4 → | Dec 2, 12:23 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $33.64 | $33,640 | 38,452 | −2.53% | plan? |
| Nov 2, 2015 SForm 4 → | Nov 2, 5:23 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $30.96 | $30,960 | 39,452 | −2.47% | plan? |
| Oct 1, 2015 SForm 4 → | Oct 2, 9:59 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $27.23 | $27,230 | 40,452 | −2.41% | plan? |
| Sep 1, 2015 SForm 4 → | Sep 1, 5:16 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $27.38 | $27,380 | 41,452 | −2.36% | plan? |
| Aug 3, 2015 SForm 4 → | Aug 3, 4:08 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $31.85 | $31,850 | 42,452 | −2.30% | plan? |
| Jul 1, 2015 SForm 4 → | Jul 2, 11:47 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $34.02 | $34,020 | 43,452 | −2.25% | plan? |
| Jun 1, 2015 SForm 4 → | Jun 2, 11:22 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $31.46 | $31,460 | 44,452 | −2.20% | plan? |
| May 1, 2015 SForm 4 → | May 4, 9:57 am EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $35.03 | $35,030 | 45,452 | −2.15% | plan? |
| Apr 1, 2015 SForm 4 → | Apr 2, 1:09 pm EDT | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $35.35 | $35,350 | 46,452 | −2.11% | plan? |
| Mar 2, 2015 SForm 4 → | Mar 3, 1:18 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $36.56 | $36,560 | 47,452 | −2.06% | plan? |
| Feb 10, 2015 SForm 4 → | Feb 10, 6:10 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 2,000 | $40.00 | $80,000 | 48,452 | −3.96% | plan? |
| Feb 2, 2015 SForm 4 → | Feb 3, 12:03 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $37.41 | $37,410 | 50,452 | −1.94% | plan? |
| Jan 2, 2015 SForm 4 → | Jan 2, 3:36 pm EST | COGENT COMMUNICATIONS HOLDINGS, INC.CCOI | 1,000 | $35.85 | $35,850 | 51,452 | −1.91% | plan? |