| 2023-11-20 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 9,000 0.0184% | $67.14 | $604,251 | -2.22% | |
| 2023-11-17 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 8,621 0.0181% | $67.17 | $579,032 | +1.03% | |
| 2023-11-16 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 379 0.0008% | $67.00 | $25,393 | -1.19% | |
| 2021-08-09 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 8,750 0.019% | $77.69 | $679,766 | -12.84% | |
| 2020-03-05 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 5,500 0.012% | $86.45 | $475,490 | -21.7% | |
| 2019-12-05 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 400 0.0009% | $62.45 | $24,978 | +19.15% | |
| 2019-12-04 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 7,600 0.0167% | $62.31 | $473,576 | +18.55% | |
| 2019-05-09 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 10,000 0.022% | $57.88 | $578,776 | +9.66% | |
| 2018-09-13 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 3,589 0.0079% | $54.94 | $197,186 | +0.82% | |
| 2018-09-12 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 7,411 0.0165% | $55.03 | $407,864 | +1.04% | |
| 2018-09-11 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 11,000 0.0244% | $54.86 | $603,448 | +0.98% | |
| 2012-02-27 | Sale | Cogent Communications Holdings, Inc. CCOI | director | 35,000 0.0774% | $18.47 | $646,398 | +8.62% | |
| 2011-01-03 | Cogent Communications Holdings, Inc. CCOI | director | 5,275 0.0119% | $14.22 | $74,989 | +4.04% | ||
| 2010-01-04 | Cogent Communications Holdings, Inc. CCOI | director | 7,500 0.0169% | $9.95 | $74,647 | +1.91% | ||
| 2009-01-05 | Cogent Communications Holdings, Inc. CCOI | director | 11,200 0.0261% | $6.70 | $75,005 | +25.45% |